git.oblomov.eu Git - linux-2.6/blob - drivers/macintosh/via-pmu.c

   1 /*
   2  * Device driver for the via-pmu on Apple Powermacs.
   3  *
   4  * The VIA (versatile interface adapter) interfaces to the PMU,
   5  * a 6805 microprocessor core whose primary function is to control
   6  * battery charging and system power on the PowerBook 3400 and 2400.
   7  * The PMU also controls the ADB (Apple Desktop Bus) which connects
   8  * to the keyboard and mouse, as well as the non-volatile RAM
   9  * and the RTC (real time clock) chip.
  10  *
  11  * Copyright (C) 1998 Paul Mackerras and Fabio Riccardi.
  12  * Copyright (C) 2001-2002 Benjamin Herrenschmidt
  13  *
  14  * THIS DRIVER IS BECOMING A TOTAL MESS !
  15  *  - Cleanup atomically disabling reply to PMU events after
  16  *    a sleep or a freq. switch
  17  *  - Move sleep code out of here to pmac_pm, merge into new
  18  *    common PM infrastructure
  19  *  - Save/Restore PCI space properly
  20  *
  21  */
  22 #include <stdarg.h>
  23 #include <linux/types.h>
  24 #include <linux/errno.h>
  25 #include <linux/kernel.h>
  26 #include <linux/delay.h>
  27 #include <linux/sched.h>
  28 #include <linux/miscdevice.h>
  29 #include <linux/blkdev.h>
  30 #include <linux/pci.h>
  31 #include <linux/slab.h>
  32 #include <linux/poll.h>
  33 #include <linux/adb.h>
  34 #include <linux/pmu.h>
  35 #include <linux/cuda.h>
  36 #include <linux/smp_lock.h>
  37 #include <linux/module.h>
  38 #include <linux/spinlock.h>
  39 #include <linux/pm.h>
  40 #include <linux/proc_fs.h>
  41 #include <linux/init.h>
  42 #include <linux/interrupt.h>
  43 #include <linux/device.h>
  44 #include <linux/sysdev.h>
  45 #include <linux/suspend.h>
  46 #include <linux/syscalls.h>
  47 #include <linux/cpu.h>
  48 #include <asm/prom.h>
  49 #include <asm/machdep.h>
  50 #include <asm/io.h>
  51 #include <asm/pgtable.h>
  52 #include <asm/system.h>
  53 #include <asm/sections.h>
  54 #include <asm/irq.h>
  55 #include <asm/pmac_feature.h>
  56 #include <asm/pmac_pfunc.h>
  57 #include <asm/pmac_low_i2c.h>
  58 #include <asm/uaccess.h>
  59 #include <asm/mmu_context.h>
  60 #include <asm/cputable.h>
  61 #include <asm/time.h>
  62 #include <asm/backlight.h>
  63
  64 #include "via-pmu-event.h"
  65
  66 /* Some compile options */
  67 #undef SUSPEND_USES_PMU
  68 #define DEBUG_SLEEP
  69 #undef HACKED_PCI_SAVE
  70
  71 /* Misc minor number allocated for /dev/pmu */
  72 #define PMU_MINOR               154
  73
  74 /* How many iterations between battery polls */
  75 #define BATTERY_POLLING_COUNT   2
  76
  77 static volatile unsigned char __iomem *via;
  78
  79 /* VIA registers - spaced 0x200 bytes apart */
  80 #define RS              0x200           /* skip between registers */
  81 #define B               0               /* B-side data */
  82 #define A               RS              /* A-side data */
  83 #define DIRB            (2*RS)          /* B-side direction (1=output) */
  84 #define DIRA            (3*RS)          /* A-side direction (1=output) */
  85 #define T1CL            (4*RS)          /* Timer 1 ctr/latch (low 8 bits) */
  86 #define T1CH            (5*RS)          /* Timer 1 counter (high 8 bits) */
  87 #define T1LL            (6*RS)          /* Timer 1 latch (low 8 bits) */
  88 #define T1LH            (7*RS)          /* Timer 1 latch (high 8 bits) */
  89 #define T2CL            (8*RS)          /* Timer 2 ctr/latch (low 8 bits) */
  90 #define T2CH            (9*RS)          /* Timer 2 counter (high 8 bits) */
  91 #define SR              (10*RS)         /* Shift register */
  92 #define ACR             (11*RS)         /* Auxiliary control register */
  93 #define PCR             (12*RS)         /* Peripheral control register */
  94 #define IFR             (13*RS)         /* Interrupt flag register */
  95 #define IER             (14*RS)         /* Interrupt enable register */
  96 #define ANH             (15*RS)         /* A-side data, no handshake */
  97
  98 /* Bits in B data register: both active low */
  99 #define TACK            0x08            /* Transfer acknowledge (input) */
 100 #define TREQ            0x10            /* Transfer request (output) */
 101
 102 /* Bits in ACR */
 103 #define SR_CTRL         0x1c            /* Shift register control bits */
 104 #define SR_EXT          0x0c            /* Shift on external clock */
 105 #define SR_OUT          0x10            /* Shift out if 1 */
 106
 107 /* Bits in IFR and IER */
 108 #define IER_SET         0x80            /* set bits in IER */
 109 #define IER_CLR         0               /* clear bits in IER */
 110 #define SR_INT          0x04            /* Shift register full/empty */
 111 #define CB2_INT         0x08
 112 #define CB1_INT         0x10            /* transition on CB1 input */
 113
 114 static volatile enum pmu_state {
 115         idle,
 116         sending,
 117         intack,
 118         reading,
 119         reading_intr,
 120         locked,
 121 } pmu_state;
 122
 123 static volatile enum int_data_state {
 124         int_data_empty,
 125         int_data_fill,
 126         int_data_ready,
 127         int_data_flush
 128 } int_data_state[2] = { int_data_empty, int_data_empty };
 129
 130 static struct adb_request *current_req;
 131 static struct adb_request *last_req;
 132 static struct adb_request *req_awaiting_reply;
 133 static unsigned char interrupt_data[2][32];
 134 static int interrupt_data_len[2];
 135 static int int_data_last;
 136 static unsigned char *reply_ptr;
 137 static int data_index;
 138 static int data_len;
 139 static volatile int adb_int_pending;
 140 static volatile int disable_poll;
 141 static struct device_node *vias;
 142 static int pmu_kind = PMU_UNKNOWN;
 143 static int pmu_fully_inited = 0;
 144 static int pmu_has_adb;
 145 static struct device_node *gpio_node;
 146 static unsigned char __iomem *gpio_reg = NULL;
 147 static int gpio_irq = NO_IRQ;
 148 static int gpio_irq_enabled = -1;
 149 static volatile int pmu_suspended = 0;
 150 static spinlock_t pmu_lock;
 151 static u8 pmu_intr_mask;
 152 static int pmu_version;
 153 static int drop_interrupts;
 154 #if defined(CONFIG_PM) && defined(CONFIG_PPC32)
 155 static int option_lid_wakeup = 1;
 156 #endif /* CONFIG_PM && CONFIG_PPC32 */
 157 #if (defined(CONFIG_PM)&&defined(CONFIG_PPC32))||defined(CONFIG_PMAC_BACKLIGHT_LEGACY)
 158 static int sleep_in_progress;
 159 #endif
 160 static unsigned long async_req_locks;
 161 static unsigned int pmu_irq_stats[11];
 162
 163 static struct proc_dir_entry *proc_pmu_root;
 164 static struct proc_dir_entry *proc_pmu_info;
 165 static struct proc_dir_entry *proc_pmu_irqstats;
 166 static struct proc_dir_entry *proc_pmu_options;
 167 static int option_server_mode;
 168
 169 int pmu_battery_count;
 170 int pmu_cur_battery;
 171 unsigned int pmu_power_flags;
 172 struct pmu_battery_info pmu_batteries[PMU_MAX_BATTERIES];
 173 static int query_batt_timer = BATTERY_POLLING_COUNT;
 174 static struct adb_request batt_req;
 175 static struct proc_dir_entry *proc_pmu_batt[PMU_MAX_BATTERIES];
 176
 177 int __fake_sleep;
 178 int asleep;
 179 BLOCKING_NOTIFIER_HEAD(sleep_notifier_list);
 180
 181 #ifdef CONFIG_ADB
 182 static int adb_dev_map = 0;
 183 static int pmu_adb_flags;
 184
 185 static int pmu_probe(void);
 186 static int pmu_init(void);
 187 static int pmu_send_request(struct adb_request *req, int sync);
 188 static int pmu_adb_autopoll(int devs);
 189 static int pmu_adb_reset_bus(void);
 190 #endif /* CONFIG_ADB */
 191
 192 static int init_pmu(void);
 193 static void pmu_start(void);
 194 static irqreturn_t via_pmu_interrupt(int irq, void *arg, struct pt_regs *regs);
 195 static irqreturn_t gpio1_interrupt(int irq, void *arg, struct pt_regs *regs);
 196 static int proc_get_info(char *page, char **start, off_t off,
 197                           int count, int *eof, void *data);
 198 static int proc_get_irqstats(char *page, char **start, off_t off,
 199                           int count, int *eof, void *data);
 200 static void pmu_pass_intr(unsigned char *data, int len);
 201 static int proc_get_batt(char *page, char **start, off_t off,
 202                         int count, int *eof, void *data);
 203 static int proc_read_options(char *page, char **start, off_t off,
 204                         int count, int *eof, void *data);
 205 static int proc_write_options(struct file *file, const char __user *buffer,
 206                         unsigned long count, void *data);
 207
 208 #ifdef CONFIG_ADB
 209 struct adb_driver via_pmu_driver = {
 210         "PMU",
 211         pmu_probe,
 212         pmu_init,
 213         pmu_send_request,
 214         pmu_adb_autopoll,
 215         pmu_poll_adb,
 216         pmu_adb_reset_bus
 217 };
 218 #endif /* CONFIG_ADB */
 219
 220 extern void low_sleep_handler(void);
 221 extern void enable_kernel_altivec(void);
 222 extern void enable_kernel_fp(void);
 223
 224 #ifdef DEBUG_SLEEP
 225 int pmu_polled_request(struct adb_request *req);
 226 int pmu_wink(struct adb_request *req);
 227 #endif
 228
 229 /*
 230  * This table indicates for each PMU opcode:
 231  * - the number of data bytes to be sent with the command, or -1
 232  *   if a length byte should be sent,
 233  * - the number of response bytes which the PMU will return, or
 234  *   -1 if it will send a length byte.
 235  */
 236 static const s8 pmu_data_len[256][2] = {
 237 /*         0       1       2       3       4       5       6       7  */
 238 /*00*/  {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 239 /*08*/  {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
 240 /*10*/  { 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 241 /*18*/  { 0, 1},{ 0, 1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{ 0, 0},
 242 /*20*/  {-1, 0},{ 0, 0},{ 2, 0},{ 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},
 243 /*28*/  { 0,-1},{ 0,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{ 0,-1},
 244 /*30*/  { 4, 0},{20, 0},{-1, 0},{ 3, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 245 /*38*/  { 0, 4},{ 0,20},{ 2,-1},{ 2, 1},{ 3,-1},{-1,-1},{-1,-1},{ 4, 0},
 246 /*40*/  { 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 247 /*48*/  { 0, 1},{ 0, 1},{-1,-1},{ 1, 0},{ 1, 0},{-1,-1},{-1,-1},{-1,-1},
 248 /*50*/  { 1, 0},{ 0, 0},{ 2, 0},{ 2, 0},{-1, 0},{ 1, 0},{ 3, 0},{ 1, 0},
 249 /*58*/  { 0, 1},{ 1, 0},{ 0, 2},{ 0, 2},{ 0,-1},{-1,-1},{-1,-1},{-1,-1},
 250 /*60*/  { 2, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 251 /*68*/  { 0, 3},{ 0, 3},{ 0, 2},{ 0, 8},{ 0,-1},{ 0,-1},{-1,-1},{-1,-1},
 252 /*70*/  { 1, 0},{ 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 253 /*78*/  { 0,-1},{ 0,-1},{-1,-1},{-1,-1},{-1,-1},{ 5, 1},{ 4, 1},{ 4, 1},
 254 /*80*/  { 4, 0},{-1, 0},{ 0, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 255 /*88*/  { 0, 5},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
 256 /*90*/  { 1, 0},{ 2, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 257 /*98*/  { 0, 1},{ 0, 1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
 258 /*a0*/  { 2, 0},{ 2, 0},{ 2, 0},{ 4, 0},{-1, 0},{ 0, 0},{-1, 0},{-1, 0},
 259 /*a8*/  { 1, 1},{ 1, 0},{ 3, 0},{ 2, 0},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
 260 /*b0*/  {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 261 /*b8*/  {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
 262 /*c0*/  {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 263 /*c8*/  {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
 264 /*d0*/  { 0, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 265 /*d8*/  { 1, 1},{ 1, 1},{-1,-1},{-1,-1},{ 0, 1},{ 0,-1},{-1,-1},{-1,-1},
 266 /*e0*/  {-1, 0},{ 4, 0},{ 0, 1},{-1, 0},{-1, 0},{ 4, 0},{-1, 0},{-1, 0},
 267 /*e8*/  { 3,-1},{-1,-1},{ 0, 1},{-1,-1},{ 0,-1},{-1,-1},{-1,-1},{ 0, 0},
 268 /*f0*/  {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 269 /*f8*/  {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
 270 };
 271
 272 static char *pbook_type[] = {
 273         "Unknown PowerBook",
 274         "PowerBook 2400/3400/3500(G3)",
 275         "PowerBook G3 Series",
 276         "1999 PowerBook G3",
 277         "Core99"
 278 };
 279
 280 int __init find_via_pmu(void)
 281 {
 282         u64 taddr;
 283         const u32 *reg;
 284
 285         if (via != 0)
 286                 return 1;
 287         vias = of_find_node_by_name(NULL, "via-pmu");
 288         if (vias == NULL)
 289                 return 0;
 290
 291         reg = get_property(vias, "reg", NULL);
 292         if (reg == NULL) {
 293                 printk(KERN_ERR "via-pmu: No \"reg\" property !\n");
 294                 goto fail;
 295         }
 296         taddr = of_translate_address(vias, reg);
 297         if (taddr == OF_BAD_ADDR) {
 298                 printk(KERN_ERR "via-pmu: Can't translate address !\n");
 299                 goto fail;
 300         }
 301
 302         spin_lock_init(&pmu_lock);
 303
 304         pmu_has_adb = 1;
 305
 306         pmu_intr_mask = PMU_INT_PCEJECT |
 307                         PMU_INT_SNDBRT |
 308                         PMU_INT_ADB |
 309                         PMU_INT_TICK;
 310
 311         if (vias->parent->name && ((strcmp(vias->parent->name, "ohare") == 0)
 312             || device_is_compatible(vias->parent, "ohare")))
 313                 pmu_kind = PMU_OHARE_BASED;
 314         else if (device_is_compatible(vias->parent, "paddington"))
 315                 pmu_kind = PMU_PADDINGTON_BASED;
 316         else if (device_is_compatible(vias->parent, "heathrow"))
 317                 pmu_kind = PMU_HEATHROW_BASED;
 318         else if (device_is_compatible(vias->parent, "Keylargo")
 319                  || device_is_compatible(vias->parent, "K2-Keylargo")) {
 320                 struct device_node *gpiop;
 321                 u64 gaddr = OF_BAD_ADDR;
 322
 323                 pmu_kind = PMU_KEYLARGO_BASED;
 324                 pmu_has_adb = (find_type_devices("adb") != NULL);
 325                 pmu_intr_mask = PMU_INT_PCEJECT |
 326                                 PMU_INT_SNDBRT |
 327                                 PMU_INT_ADB |
 328                                 PMU_INT_TICK |
 329                                 PMU_INT_ENVIRONMENT;
 330
 331                 gpiop = of_find_node_by_name(NULL, "gpio");
 332                 if (gpiop) {
 333                         reg = get_property(gpiop, "reg", NULL);
 334                         if (reg)
 335                                 gaddr = of_translate_address(gpiop, reg);
 336                         if (gaddr != OF_BAD_ADDR)
 337                                 gpio_reg = ioremap(gaddr, 0x10);
 338                 }
 339                 if (gpio_reg == NULL)
 340                         printk(KERN_ERR "via-pmu: Can't find GPIO reg !\n");
 341         } else
 342                 pmu_kind = PMU_UNKNOWN;
 343
 344         via = ioremap(taddr, 0x2000);
 345         if (via == NULL) {
 346                 printk(KERN_ERR "via-pmu: Can't map address !\n");
 347                 goto fail;
 348         }
 349
 350         out_8(&via[IER], IER_CLR | 0x7f);       /* disable all intrs */
 351         out_8(&via[IFR], 0x7f);                 /* clear IFR */
 352
 353         pmu_state = idle;
 354
 355         if (!init_pmu()) {
 356                 via = NULL;
 357                 return 0;
 358         }
 359
 360         printk(KERN_INFO "PMU driver v%d initialized for %s, firmware: %02x\n",
 361                PMU_DRIVER_VERSION, pbook_type[pmu_kind], pmu_version);
 362
 363         sys_ctrler = SYS_CTRLER_PMU;
 364
 365         return 1;
 366  fail:
 367         of_node_put(vias);
 368         vias = NULL;
 369         return 0;
 370 }
 371
 372 #ifdef CONFIG_ADB
 373 static int pmu_probe(void)
 374 {
 375         return vias == NULL? -ENODEV: 0;
 376 }
 377
 378 static int __init pmu_init(void)
 379 {
 380         if (vias == NULL)
 381                 return -ENODEV;
 382         return 0;
 383 }
 384 #endif /* CONFIG_ADB */
 385
 386 /*
 387  * We can't wait until pmu_init gets called, that happens too late.
 388  * It happens after IDE and SCSI initialization, which can take a few
 389  * seconds, and by that time the PMU could have given up on us and
 390  * turned us off.
 391  * Thus this is called with arch_initcall rather than device_initcall.
 392  */
 393 static int __init via_pmu_start(void)
 394 {
 395         unsigned int irq;
 396
 397         if (vias == NULL)
 398                 return -ENODEV;
 399
 400         batt_req.complete = 1;
 401
 402         irq = irq_of_parse_and_map(vias, 0);
 403         if (irq == NO_IRQ) {
 404                 printk(KERN_ERR "via-pmu: can't map interruptn");
 405                 return -ENODEV;
 406         }
 407         if (request_irq(irq, via_pmu_interrupt, 0, "VIA-PMU", (void *)0)) {
 408                 printk(KERN_ERR "via-pmu: can't request irq %d\n", irq);
 409                 return -ENODEV;
 410         }
 411
 412         if (pmu_kind == PMU_KEYLARGO_BASED) {
 413                 gpio_node = of_find_node_by_name(NULL, "extint-gpio1");
 414                 if (gpio_node == NULL)
 415                         gpio_node = of_find_node_by_name(NULL,
 416                                                          "pmu-interrupt");
 417                 if (gpio_node)
 418                         gpio_irq = irq_of_parse_and_map(gpio_node, 0);
 419
 420                 if (gpio_irq != NO_IRQ) {
 421                         if (request_irq(gpio_irq, gpio1_interrupt, 0,
 422                                         "GPIO1 ADB", (void *)0))
 423                                 printk(KERN_ERR "pmu: can't get irq %d"
 424                                        " (GPIO1)\n", gpio_irq);
 425                         else
 426                                 gpio_irq_enabled = 1;
 427                 }
 428         }
 429
 430         /* Enable interrupts */
 431         out_8(&via[IER], IER_SET | SR_INT | CB1_INT);
 432
 433         pmu_fully_inited = 1;
 434
 435         /* Make sure PMU settle down before continuing. This is _very_ important
 436          * since the IDE probe may shut interrupts down for quite a bit of time. If
 437          * a PMU communication is pending while this happens, the PMU may timeout
 438          * Not that on Core99 machines, the PMU keeps sending us environement
 439          * messages, we should find a way to either fix IDE or make it call
 440          * pmu_suspend() before masking interrupts. This can also happens while
 441          * scolling with some fbdevs.
 442          */
 443         do {
 444                 pmu_poll();
 445         } while (pmu_state != idle);
 446
 447         return 0;
 448 }
 449
 450 arch_initcall(via_pmu_start);
 451
 452 /*
 453  * This has to be done after pci_init, which is a subsys_initcall.
 454  */
 455 static int __init via_pmu_dev_init(void)
 456 {
 457         if (vias == NULL)
 458                 return -ENODEV;
 459
 460 #ifdef CONFIG_PMAC_BACKLIGHT
 461         /* Initialize backlight */
 462         pmu_backlight_init();
 463 #endif
 464
 465 #ifdef CONFIG_PPC32
 466         if (machine_is_compatible("AAPL,3400/2400") ||
 467                 machine_is_compatible("AAPL,3500")) {
 468                 int mb = pmac_call_feature(PMAC_FTR_GET_MB_INFO,
 469                         NULL, PMAC_MB_INFO_MODEL, 0);
 470                 pmu_battery_count = 1;
 471                 if (mb == PMAC_TYPE_COMET)
 472                         pmu_batteries[0].flags |= PMU_BATT_TYPE_COMET;
 473                 else
 474                         pmu_batteries[0].flags |= PMU_BATT_TYPE_HOOPER;
 475         } else if (machine_is_compatible("AAPL,PowerBook1998") ||
 476                 machine_is_compatible("PowerBook1,1")) {
 477                 pmu_battery_count = 2;
 478                 pmu_batteries[0].flags |= PMU_BATT_TYPE_SMART;
 479                 pmu_batteries[1].flags |= PMU_BATT_TYPE_SMART;
 480         } else {
 481                 struct device_node* prim = find_devices("power-mgt");
 482                 const u32 *prim_info = NULL;
 483                 if (prim)
 484                         prim_info = get_property(prim, "prim-info", NULL);
 485                 if (prim_info) {
 486                         /* Other stuffs here yet unknown */
 487                         pmu_battery_count = (prim_info[6] >> 16) & 0xff;
 488                         pmu_batteries[0].flags |= PMU_BATT_TYPE_SMART;
 489                         if (pmu_battery_count > 1)
 490                                 pmu_batteries[1].flags |= PMU_BATT_TYPE_SMART;
 491                 }
 492         }
 493 #endif /* CONFIG_PPC32 */
 494
 495         /* Create /proc/pmu */
 496         proc_pmu_root = proc_mkdir("pmu", NULL);
 497         if (proc_pmu_root) {
 498                 long i;
 499
 500                 for (i=0; i<pmu_battery_count; i++) {
 501                         char title[16];
 502                         sprintf(title, "battery_%ld", i);
 503                         proc_pmu_batt[i] = create_proc_read_entry(title, 0, proc_pmu_root,
 504                                                 proc_get_batt, (void *)i);
 505                 }
 506
 507                 proc_pmu_info = create_proc_read_entry("info", 0, proc_pmu_root,
 508                                         proc_get_info, NULL);
 509                 proc_pmu_irqstats = create_proc_read_entry("interrupts", 0, proc_pmu_root,
 510                                         proc_get_irqstats, NULL);
 511                 proc_pmu_options = create_proc_entry("options", 0600, proc_pmu_root);
 512                 if (proc_pmu_options) {
 513                         proc_pmu_options->nlink = 1;
 514                         proc_pmu_options->read_proc = proc_read_options;
 515                         proc_pmu_options->write_proc = proc_write_options;
 516                 }
 517         }
 518         return 0;
 519 }
 520
 521 device_initcall(via_pmu_dev_init);
 522
 523 static int
 524 init_pmu(void)
 525 {
 526         int timeout;
 527         struct adb_request req;
 528
 529         out_8(&via[B], via[B] | TREQ);                  /* negate TREQ */
 530         out_8(&via[DIRB], (via[DIRB] | TREQ) & ~TACK);  /* TACK in, TREQ out */
 531
 532         pmu_request(&req, NULL, 2, PMU_SET_INTR_MASK, pmu_intr_mask);
 533         timeout =  100000;
 534         while (!req.complete) {
 535                 if (--timeout < 0) {
 536                         printk(KERN_ERR "init_pmu: no response from PMU\n");
 537                         return 0;
 538                 }
 539                 udelay(10);
 540                 pmu_poll();
 541         }
 542
 543         /* ack all pending interrupts */
 544         timeout = 100000;
 545         interrupt_data[0][0] = 1;
 546         while (interrupt_data[0][0] || pmu_state != idle) {
 547                 if (--timeout < 0) {
 548                         printk(KERN_ERR "init_pmu: timed out acking intrs\n");
 549                         return 0;
 550                 }
 551                 if (pmu_state == idle)
 552                         adb_int_pending = 1;
 553                 via_pmu_interrupt(0, NULL, NULL);
 554                 udelay(10);
 555         }
 556
 557         /* Tell PMU we are ready.  */
 558         if (pmu_kind == PMU_KEYLARGO_BASED) {
 559                 pmu_request(&req, NULL, 2, PMU_SYSTEM_READY, 2);
 560                 while (!req.complete)
 561                         pmu_poll();
 562         }
 563
 564         /* Read PMU version */
 565         pmu_request(&req, NULL, 1, PMU_GET_VERSION);
 566         pmu_wait_complete(&req);
 567         if (req.reply_len > 0)
 568                 pmu_version = req.reply[0];
 569
 570         /* Read server mode setting */
 571         if (pmu_kind == PMU_KEYLARGO_BASED) {
 572                 pmu_request(&req, NULL, 2, PMU_POWER_EVENTS,
 573                             PMU_PWR_GET_POWERUP_EVENTS);
 574                 pmu_wait_complete(&req);
 575                 if (req.reply_len == 2) {
 576                         if (req.reply[1] & PMU_PWR_WAKEUP_AC_INSERT)
 577                                 option_server_mode = 1;
 578                         printk(KERN_INFO "via-pmu: Server Mode is %s\n",
 579                                option_server_mode ? "enabled" : "disabled");
 580                 }
 581         }
 582         return 1;
 583 }
 584
 585 int
 586 pmu_get_model(void)
 587 {
 588         return pmu_kind;
 589 }
 590
 591 static void pmu_set_server_mode(int server_mode)
 592 {
 593         struct adb_request req;
 594
 595         if (pmu_kind != PMU_KEYLARGO_BASED)
 596                 return;
 597
 598         option_server_mode = server_mode;
 599         pmu_request(&req, NULL, 2, PMU_POWER_EVENTS, PMU_PWR_GET_POWERUP_EVENTS);
 600         pmu_wait_complete(&req);
 601         if (req.reply_len < 2)
 602                 return;
 603         if (server_mode)
 604                 pmu_request(&req, NULL, 4, PMU_POWER_EVENTS,
 605                             PMU_PWR_SET_POWERUP_EVENTS,
 606                             req.reply[0], PMU_PWR_WAKEUP_AC_INSERT);
 607         else
 608                 pmu_request(&req, NULL, 4, PMU_POWER_EVENTS,
 609                             PMU_PWR_CLR_POWERUP_EVENTS,
 610                             req.reply[0], PMU_PWR_WAKEUP_AC_INSERT);
 611         pmu_wait_complete(&req);
 612 }
 613
 614 /* This new version of the code for 2400/3400/3500 powerbooks
 615  * is inspired from the implementation in gkrellm-pmu
 616  */
 617 static void
 618 done_battery_state_ohare(struct adb_request* req)
 619 {
 620         /* format:
 621          *  [0]    :  flags
 622          *    0x01 :  AC indicator
 623          *    0x02 :  charging
 624          *    0x04 :  battery exist
 625          *    0x08 :
 626          *    0x10 :
 627          *    0x20 :  full charged
 628          *    0x40 :  pcharge reset
 629          *    0x80 :  battery exist
 630          *
 631          *  [1][2] :  battery voltage
 632          *  [3]    :  CPU temperature
 633          *  [4]    :  battery temperature
 634          *  [5]    :  current
 635          *  [6][7] :  pcharge
 636          *              --tkoba
 637          */
 638         unsigned int bat_flags = PMU_BATT_TYPE_HOOPER;
 639         long pcharge, charge, vb, vmax, lmax;
 640         long vmax_charging, vmax_charged;
 641         long amperage, voltage, time, max;
 642         int mb = pmac_call_feature(PMAC_FTR_GET_MB_INFO,
 643                         NULL, PMAC_MB_INFO_MODEL, 0);
 644
 645         if (req->reply[0] & 0x01)
 646                 pmu_power_flags |= PMU_PWR_AC_PRESENT;
 647         else
 648                 pmu_power_flags &= ~PMU_PWR_AC_PRESENT;
 649
 650         if (mb == PMAC_TYPE_COMET) {
 651                 vmax_charged = 189;
 652                 vmax_charging = 213;
 653                 lmax = 6500;
 654         } else {
 655                 vmax_charged = 330;
 656                 vmax_charging = 330;
 657                 lmax = 6500;
 658         }
 659         vmax = vmax_charged;
 660
 661         /* If battery installed */
 662         if (req->reply[0] & 0x04) {
 663                 bat_flags |= PMU_BATT_PRESENT;
 664                 if (req->reply[0] & 0x02)
 665                         bat_flags |= PMU_BATT_CHARGING;
 666                 vb = (req->reply[1] << 8) | req->reply[2];
 667                 voltage = (vb * 265 + 72665) / 10;
 668                 amperage = req->reply[5];
 669                 if ((req->reply[0] & 0x01) == 0) {
 670                         if (amperage > 200)
 671                                 vb += ((amperage - 200) * 15)/100;
 672                 } else if (req->reply[0] & 0x02) {
 673                         vb = (vb * 97) / 100;
 674                         vmax = vmax_charging;
 675                 }
 676                 charge = (100 * vb) / vmax;
 677                 if (req->reply[0] & 0x40) {
 678                         pcharge = (req->reply[6] << 8) + req->reply[7];
 679                         if (pcharge > lmax)
 680                                 pcharge = lmax;
 681                         pcharge *= 100;
 682                         pcharge = 100 - pcharge / lmax;
 683                         if (pcharge < charge)
 684                                 charge = pcharge;
 685                 }
 686                 if (amperage > 0)
 687                         time = (charge * 16440) / amperage;
 688                 else
 689                         time = 0;
 690                 max = 100;
 691                 amperage = -amperage;
 692         } else
 693                 charge = max = amperage = voltage = time = 0;
 694
 695         pmu_batteries[pmu_cur_battery].flags = bat_flags;
 696         pmu_batteries[pmu_cur_battery].charge = charge;
 697         pmu_batteries[pmu_cur_battery].max_charge = max;
 698         pmu_batteries[pmu_cur_battery].amperage = amperage;
 699         pmu_batteries[pmu_cur_battery].voltage = voltage;
 700         pmu_batteries[pmu_cur_battery].time_remaining = time;
 701
 702         clear_bit(0, &async_req_locks);
 703 }
 704
 705 static void
 706 done_battery_state_smart(struct adb_request* req)
 707 {
 708         /* format:
 709          *  [0] : format of this structure (known: 3,4,5)
 710          *  [1] : flags
 711          *
 712          *  format 3 & 4:
 713          *
 714          *  [2] : charge
 715          *  [3] : max charge
 716          *  [4] : current
 717          *  [5] : voltage
 718          *
 719          *  format 5:
 720          *
 721          *  [2][3] : charge
 722          *  [4][5] : max charge
 723          *  [6][7] : current
 724          *  [8][9] : voltage
 725          */
 726
 727         unsigned int bat_flags = PMU_BATT_TYPE_SMART;
 728         int amperage;
 729         unsigned int capa, max, voltage;
 730
 731         if (req->reply[1] & 0x01)
 732                 pmu_power_flags |= PMU_PWR_AC_PRESENT;
 733         else
 734                 pmu_power_flags &= ~PMU_PWR_AC_PRESENT;
 735
 736
 737         capa = max = amperage = voltage = 0;
 738
 739         if (req->reply[1] & 0x04) {
 740                 bat_flags |= PMU_BATT_PRESENT;
 741                 switch(req->reply[0]) {
 742                         case 3:
 743                         case 4: capa = req->reply[2];
 744                                 max = req->reply[3];
 745                                 amperage = *((signed char *)&req->reply[4]);
 746                                 voltage = req->reply[5];
 747                                 break;
 748                         case 5: capa = (req->reply[2] << 8) | req->reply[3];
 749                                 max = (req->reply[4] << 8) | req->reply[5];
 750                                 amperage = *((signed short *)&req->reply[6]);
 751                                 voltage = (req->reply[8] << 8) | req->reply[9];
 752                                 break;
 753                         default:
 754                                 printk(KERN_WARNING "pmu.c : unrecognized battery info, len: %d, %02x %02x %02x %02x\n",
 755                                         req->reply_len, req->reply[0], req->reply[1], req->reply[2], req->reply[3]);
 756                                 break;
 757                 }
 758         }
 759
 760         if ((req->reply[1] & 0x01) && (amperage > 0))
 761                 bat_flags |= PMU_BATT_CHARGING;
 762
 763         pmu_batteries[pmu_cur_battery].flags = bat_flags;
 764         pmu_batteries[pmu_cur_battery].charge = capa;
 765         pmu_batteries[pmu_cur_battery].max_charge = max;
 766         pmu_batteries[pmu_cur_battery].amperage = amperage;
 767         pmu_batteries[pmu_cur_battery].voltage = voltage;
 768         if (amperage) {
 769                 if ((req->reply[1] & 0x01) && (amperage > 0))
 770                         pmu_batteries[pmu_cur_battery].time_remaining
 771                                 = ((max-capa) * 3600) / amperage;
 772                 else
 773                         pmu_batteries[pmu_cur_battery].time_remaining
 774                                 = (capa * 3600) / (-amperage);
 775         } else
 776                 pmu_batteries[pmu_cur_battery].time_remaining = 0;
 777
 778         pmu_cur_battery = (pmu_cur_battery + 1) % pmu_battery_count;
 779
 780         clear_bit(0, &async_req_locks);
 781 }
 782
 783 static void
 784 query_battery_state(void)
 785 {
 786         if (test_and_set_bit(0, &async_req_locks))
 787                 return;
 788         if (pmu_kind == PMU_OHARE_BASED)
 789                 pmu_request(&batt_req, done_battery_state_ohare,
 790                         1, PMU_BATTERY_STATE);
 791         else
 792                 pmu_request(&batt_req, done_battery_state_smart,
 793                         2, PMU_SMART_BATTERY_STATE, pmu_cur_battery+1);
 794 }
 795
 796 static int
 797 proc_get_info(char *page, char **start, off_t off,
 798                 int count, int *eof, void *data)
 799 {
 800         char* p = page;
 801
 802         p += sprintf(p, "PMU driver version     : %d\n", PMU_DRIVER_VERSION);
 803         p += sprintf(p, "PMU firmware version   : %02x\n", pmu_version);
 804         p += sprintf(p, "AC Power               : %d\n",
 805                 ((pmu_power_flags & PMU_PWR_AC_PRESENT) != 0) || pmu_battery_count == 0);
 806         p += sprintf(p, "Battery count          : %d\n", pmu_battery_count);
 807
 808         return p - page;
 809 }
 810
 811 static int
 812 proc_get_irqstats(char *page, char **start, off_t off,
 813                   int count, int *eof, void *data)
 814 {
 815         int i;
 816         char* p = page;
 817         static const char *irq_names[] = {
 818                 "Total CB1 triggered events",
 819                 "Total GPIO1 triggered events",
 820                 "PC-Card eject button",
 821                 "Sound/Brightness button",
 822                 "ADB message",
 823                 "Battery state change",
 824                 "Environment interrupt",
 825                 "Tick timer",
 826                 "Ghost interrupt (zero len)",
 827                 "Empty interrupt (empty mask)",
 828                 "Max irqs in a row"
 829         };
 830
 831         for (i=0; i<11; i++) {
 832                 p += sprintf(p, " %2u: %10u (%s)\n",
 833                              i, pmu_irq_stats[i], irq_names[i]);
 834         }
 835         return p - page;
 836 }
 837
 838 static int
 839 proc_get_batt(char *page, char **start, off_t off,
 840                 int count, int *eof, void *data)
 841 {
 842         long batnum = (long)data;
 843         char *p = page;
 844
 845         p += sprintf(p, "\n");
 846         p += sprintf(p, "flags      : %08x\n",
 847                 pmu_batteries[batnum].flags);
 848         p += sprintf(p, "charge     : %d\n",
 849                 pmu_batteries[batnum].charge);
 850         p += sprintf(p, "max_charge : %d\n",
 851                 pmu_batteries[batnum].max_charge);
 852         p += sprintf(p, "current    : %d\n",
 853                 pmu_batteries[batnum].amperage);
 854         p += sprintf(p, "voltage    : %d\n",
 855                 pmu_batteries[batnum].voltage);
 856         p += sprintf(p, "time rem.  : %d\n",
 857                 pmu_batteries[batnum].time_remaining);
 858
 859         return p - page;
 860 }
 861
 862 static int
 863 proc_read_options(char *page, char **start, off_t off,
 864                         int count, int *eof, void *data)
 865 {
 866         char *p = page;
 867
 868 #if defined(CONFIG_PM) && defined(CONFIG_PPC32)
 869         if (pmu_kind == PMU_KEYLARGO_BASED &&
 870             pmac_call_feature(PMAC_FTR_SLEEP_STATE,NULL,0,-1) >= 0)
 871                 p += sprintf(p, "lid_wakeup=%d\n", option_lid_wakeup);
 872 #endif
 873         if (pmu_kind == PMU_KEYLARGO_BASED)
 874                 p += sprintf(p, "server_mode=%d\n", option_server_mode);
 875
 876         return p - page;
 877 }
 878
 879 static int
 880 proc_write_options(struct file *file, const char __user *buffer,
 881                         unsigned long count, void *data)
 882 {
 883         char tmp[33];
 884         char *label, *val;
 885         unsigned long fcount = count;
 886
 887         if (!count)
 888                 return -EINVAL;
 889         if (count > 32)
 890                 count = 32;
 891         if (copy_from_user(tmp, buffer, count))
 892                 return -EFAULT;
 893         tmp[count] = 0;
 894
 895         label = tmp;
 896         while(*label == ' ')
 897                 label++;
 898         val = label;
 899         while(*val && (*val != '=')) {
 900                 if (*val == ' ')
 901                         *val = 0;
 902                 val++;
 903         }
 904         if ((*val) == 0)
 905                 return -EINVAL;
 906         *(val++) = 0;
 907         while(*val == ' ')
 908                 val++;
 909 #if defined(CONFIG_PM) && defined(CONFIG_PPC32)
 910         if (pmu_kind == PMU_KEYLARGO_BASED &&
 911             pmac_call_feature(PMAC_FTR_SLEEP_STATE,NULL,0,-1) >= 0)
 912                 if (!strcmp(label, "lid_wakeup"))
 913                         option_lid_wakeup = ((*val) == '1');
 914 #endif
 915         if (pmu_kind == PMU_KEYLARGO_BASED && !strcmp(label, "server_mode")) {
 916                 int new_value;
 917                 new_value = ((*val) == '1');
 918                 if (new_value != option_server_mode)
 919                         pmu_set_server_mode(new_value);
 920         }
 921         return fcount;
 922 }
 923
 924 #ifdef CONFIG_ADB
 925 /* Send an ADB command */
 926 static int
 927 pmu_send_request(struct adb_request *req, int sync)
 928 {
 929         int i, ret;
 930
 931         if ((vias == NULL) || (!pmu_fully_inited)) {
 932                 req->complete = 1;
 933                 return -ENXIO;
 934         }
 935
 936         ret = -EINVAL;
 937
 938         switch (req->data[0]) {
 939         case PMU_PACKET:
 940                 for (i = 0; i < req->nbytes - 1; ++i)
 941                         req->data[i] = req->data[i+1];
 942                 --req->nbytes;
 943                 if (pmu_data_len[req->data[0]][1] != 0) {
 944                         req->reply[0] = ADB_RET_OK;
 945                         req->reply_len = 1;
 946                 } else
 947                         req->reply_len = 0;
 948                 ret = pmu_queue_request(req);
 949                 break;
 950         case CUDA_PACKET:
 951                 switch (req->data[1]) {
 952                 case CUDA_GET_TIME:
 953                         if (req->nbytes != 2)
 954                                 break;
 955                         req->data[0] = PMU_READ_RTC;
 956                         req->nbytes = 1;
 957                         req->reply_len = 3;
 958                         req->reply[0] = CUDA_PACKET;
 959                         req->reply[1] = 0;
 960                         req->reply[2] = CUDA_GET_TIME;
 961                         ret = pmu_queue_request(req);
 962                         break;
 963                 case CUDA_SET_TIME:
 964                         if (req->nbytes != 6)
 965                                 break;
 966                         req->data[0] = PMU_SET_RTC;
 967                         req->nbytes = 5;
 968                         for (i = 1; i <= 4; ++i)
 969                                 req->data[i] = req->data[i+1];
 970                         req->reply_len = 3;
 971                         req->reply[0] = CUDA_PACKET;
 972                         req->reply[1] = 0;
 973                         req->reply[2] = CUDA_SET_TIME;
 974                         ret = pmu_queue_request(req);
 975                         break;
 976                 }
 977                 break;
 978         case ADB_PACKET:
 979                 if (!pmu_has_adb)
 980                         return -ENXIO;
 981                 for (i = req->nbytes - 1; i > 1; --i)
 982                         req->data[i+2] = req->data[i];
 983                 req->data[3] = req->nbytes - 2;
 984                 req->data[2] = pmu_adb_flags;
 985                 /*req->data[1] = req->data[1];*/
 986                 req->data[0] = PMU_ADB_CMD;
 987                 req->nbytes += 2;
 988                 req->reply_expected = 1;
 989                 req->reply_len = 0;
 990                 ret = pmu_queue_request(req);
 991                 break;
 992         }
 993         if (ret) {
 994                 req->complete = 1;
 995                 return ret;
 996         }
 997
 998         if (sync)
 999                 while (!req->complete)
1000                         pmu_poll();
1001
1002         return 0;
1003 }
1004
1005 /* Enable/disable autopolling */
1006 static int
1007 pmu_adb_autopoll(int devs)
1008 {
1009         struct adb_request req;
1010
1011         if ((vias == NULL) || (!pmu_fully_inited) || !pmu_has_adb)
1012                 return -ENXIO;
1013
1014         if (devs) {
1015                 adb_dev_map = devs;
1016                 pmu_request(&req, NULL, 5, PMU_ADB_CMD, 0, 0x86,
1017                             adb_dev_map >> 8, adb_dev_map);
1018                 pmu_adb_flags = 2;
1019         } else {
1020                 pmu_request(&req, NULL, 1, PMU_ADB_POLL_OFF);
1021                 pmu_adb_flags = 0;
1022         }
1023         while (!req.complete)
1024                 pmu_poll();
1025         return 0;
1026 }
1027
1028 /* Reset the ADB bus */
1029 static int
1030 pmu_adb_reset_bus(void)
1031 {
1032         struct adb_request req;
1033         int save_autopoll = adb_dev_map;
1034
1035         if ((vias == NULL) || (!pmu_fully_inited) || !pmu_has_adb)
1036                 return -ENXIO;
1037
1038         /* anyone got a better idea?? */
1039         pmu_adb_autopoll(0);
1040
1041         req.nbytes = 5;
1042         req.done = NULL;
1043         req.data[0] = PMU_ADB_CMD;
1044         req.data[1] = 0;
1045         req.data[2] = ADB_BUSRESET;
1046         req.data[3] = 0;
1047         req.data[4] = 0;
1048         req.reply_len = 0;
1049         req.reply_expected = 1;
1050         if (pmu_queue_request(&req) != 0) {
1051                 printk(KERN_ERR "pmu_adb_reset_bus: pmu_queue_request failed\n");
1052                 return -EIO;
1053         }
1054         pmu_wait_complete(&req);
1055
1056         if (save_autopoll != 0)
1057                 pmu_adb_autopoll(save_autopoll);
1058
1059         return 0;
1060 }
1061 #endif /* CONFIG_ADB */
1062
1063 /* Construct and send a pmu request */
1064 int
1065 pmu_request(struct adb_request *req, void (*done)(struct adb_request *),
1066             int nbytes, ...)
1067 {
1068         va_list list;
1069         int i;
1070
1071         if (vias == NULL)
1072                 return -ENXIO;
1073
1074         if (nbytes < 0 || nbytes > 32) {
1075                 printk(KERN_ERR "pmu_request: bad nbytes (%d)\n", nbytes);
1076                 req->complete = 1;
1077                 return -EINVAL;
1078         }
1079         req->nbytes = nbytes;
1080         req->done = done;
1081         va_start(list, nbytes);
1082         for (i = 0; i < nbytes; ++i)
1083                 req->data[i] = va_arg(list, int);
1084         va_end(list);
1085         req->reply_len = 0;
1086         req->reply_expected = 0;
1087         return pmu_queue_request(req);
1088 }
1089
1090 int
1091 pmu_queue_request(struct adb_request *req)
1092 {
1093         unsigned long flags;
1094         int nsend;
1095
1096         if (via == NULL) {
1097                 req->complete = 1;
1098                 return -ENXIO;
1099         }
1100         if (req->nbytes <= 0) {
1101                 req->complete = 1;
1102                 return 0;
1103         }
1104         nsend = pmu_data_len[req->data[0]][0];
1105         if (nsend >= 0 && req->nbytes != nsend + 1) {
1106                 req->complete = 1;
1107                 return -EINVAL;
1108         }
1109
1110         req->next = NULL;
1111         req->sent = 0;
1112         req->complete = 0;
1113
1114         spin_lock_irqsave(&pmu_lock, flags);
1115         if (current_req != 0) {
1116                 last_req->next = req;
1117                 last_req = req;
1118         } else {
1119                 current_req = req;
1120                 last_req = req;
1121                 if (pmu_state == idle)
1122                         pmu_start();
1123         }
1124         spin_unlock_irqrestore(&pmu_lock, flags);
1125
1126         return 0;
1127 }
1128
1129 static inline void
1130 wait_for_ack(void)
1131 {
1132         /* Sightly increased the delay, I had one occurrence of the message
1133          * reported
1134          */
1135         int timeout = 4000;
1136         while ((in_8(&via[B]) & TACK) == 0) {
1137                 if (--timeout < 0) {
1138                         printk(KERN_ERR "PMU not responding (!ack)\n");
1139                         return;
1140                 }
1141                 udelay(10);
1142         }
1143 }
1144
1145 /* New PMU seems to be very sensitive to those timings, so we make sure
1146  * PCI is flushed immediately */
1147 static inline void
1148 send_byte(int x)
1149 {
1150         volatile unsigned char __iomem *v = via;
1151
1152         out_8(&v[ACR], in_8(&v[ACR]) | SR_OUT | SR_EXT);
1153         out_8(&v[SR], x);
1154         out_8(&v[B], in_8(&v[B]) & ~TREQ);              /* assert TREQ */
1155         (void)in_8(&v[B]);
1156 }
1157
1158 static inline void
1159 recv_byte(void)
1160 {
1161         volatile unsigned char __iomem *v = via;
1162
1163         out_8(&v[ACR], (in_8(&v[ACR]) & ~SR_OUT) | SR_EXT);
1164         in_8(&v[SR]);           /* resets SR */
1165         out_8(&v[B], in_8(&v[B]) & ~TREQ);
1166         (void)in_8(&v[B]);
1167 }
1168
1169 static inline void
1170 pmu_done(struct adb_request *req)
1171 {
1172         void (*done)(struct adb_request *) = req->done;
1173         mb();
1174         req->complete = 1;
1175         /* Here, we assume that if the request has a done member, the
1176          * struct request will survive to setting req->complete to 1
1177          */
1178         if (done)
1179                 (*done)(req);
1180 }
1181
1182 static void
1183 pmu_start(void)
1184 {
1185         struct adb_request *req;
1186
1187         /* assert pmu_state == idle */
1188         /* get the packet to send */
1189         req = current_req;
1190         if (req == 0 || pmu_state != idle
1191             || (/*req->reply_expected && */req_awaiting_reply))
1192                 return;
1193
1194         pmu_state = sending;
1195         data_index = 1;
1196         data_len = pmu_data_len[req->data[0]][0];
1197
1198         /* Sounds safer to make sure ACK is high before writing. This helped
1199          * kill a problem with ADB and some iBooks
1200          */
1201         wait_for_ack();
1202         /* set the shift register to shift out and send a byte */
1203         send_byte(req->data[0]);
1204 }
1205
1206 void
1207 pmu_poll(void)
1208 {
1209         if (!via)
1210                 return;
1211         if (disable_poll)
1212                 return;
1213         via_pmu_interrupt(0, NULL, NULL);
1214 }
1215
1216 void
1217 pmu_poll_adb(void)
1218 {
1219         if (!via)
1220                 return;
1221         if (disable_poll)
1222                 return;
1223         /* Kicks ADB read when PMU is suspended */
1224         adb_int_pending = 1;
1225         do {
1226                 via_pmu_interrupt(0, NULL, NULL);
1227         } while (pmu_suspended && (adb_int_pending || pmu_state != idle
1228                 || req_awaiting_reply));
1229 }
1230
1231 void
1232 pmu_wait_complete(struct adb_request *req)
1233 {
1234         if (!via)
1235                 return;
1236         while((pmu_state != idle && pmu_state != locked) || !req->complete)
1237                 via_pmu_interrupt(0, NULL, NULL);
1238 }
1239
1240 /* This function loops until the PMU is idle and prevents it from
1241  * anwsering to ADB interrupts. pmu_request can still be called.
1242  * This is done to avoid spurrious shutdowns when we know we'll have
1243  * interrupts switched off for a long time
1244  */
1245 void
1246 pmu_suspend(void)
1247 {
1248         unsigned long flags;
1249 #ifdef SUSPEND_USES_PMU
1250         struct adb_request *req;
1251 #endif
1252         if (!via)
1253                 return;
1254
1255         spin_lock_irqsave(&pmu_lock, flags);
1256         pmu_suspended++;
1257         if (pmu_suspended > 1) {
1258                 spin_unlock_irqrestore(&pmu_lock, flags);
1259                 return;
1260         }
1261
1262         do {
1263                 spin_unlock_irqrestore(&pmu_lock, flags);
1264                 if (req_awaiting_reply)
1265                         adb_int_pending = 1;
1266                 via_pmu_interrupt(0, NULL, NULL);
1267                 spin_lock_irqsave(&pmu_lock, flags);
1268                 if (!adb_int_pending && pmu_state == idle && !req_awaiting_reply) {
1269 #ifdef SUSPEND_USES_PMU
1270                         pmu_request(&req, NULL, 2, PMU_SET_INTR_MASK, 0);
1271                         spin_unlock_irqrestore(&pmu_lock, flags);
1272                         while(!req.complete)
1273                                 pmu_poll();
1274 #else /* SUSPEND_USES_PMU */
1275                         if (gpio_irq >= 0)
1276                                 disable_irq_nosync(gpio_irq);
1277                         out_8(&via[IER], CB1_INT | IER_CLR);
1278                         spin_unlock_irqrestore(&pmu_lock, flags);
1279 #endif /* SUSPEND_USES_PMU */
1280                         break;
1281                 }
1282         } while (1);
1283 }
1284
1285 void
1286 pmu_resume(void)
1287 {
1288         unsigned long flags;
1289
1290         if (!via || (pmu_suspended < 1))
1291                 return;
1292
1293         spin_lock_irqsave(&pmu_lock, flags);
1294         pmu_suspended--;
1295         if (pmu_suspended > 0) {
1296                 spin_unlock_irqrestore(&pmu_lock, flags);
1297                 return;
1298         }
1299         adb_int_pending = 1;
1300 #ifdef SUSPEND_USES_PMU
1301         pmu_request(&req, NULL, 2, PMU_SET_INTR_MASK, pmu_intr_mask);
1302         spin_unlock_irqrestore(&pmu_lock, flags);
1303         while(!req.complete)
1304                 pmu_poll();
1305 #else /* SUSPEND_USES_PMU */
1306         if (gpio_irq >= 0)
1307                 enable_irq(gpio_irq);
1308         out_8(&via[IER], CB1_INT | IER_SET);
1309         spin_unlock_irqrestore(&pmu_lock, flags);
1310         pmu_poll();
1311 #endif /* SUSPEND_USES_PMU */
1312 }
1313
1314 /* Interrupt data could be the result data from an ADB cmd */
1315 static void
1316 pmu_handle_data(unsigned char *data, int len, struct pt_regs *regs)
1317 {
1318         unsigned char ints, pirq;
1319         int i = 0;
1320
1321         asleep = 0;
1322         if (drop_interrupts || len < 1) {
1323                 adb_int_pending = 0;
1324                 pmu_irq_stats[8]++;
1325                 return;
1326         }
1327
1328         /* Get PMU interrupt mask */
1329         ints = data[0];
1330
1331         /* Record zero interrupts for stats */
1332         if (ints == 0)
1333                 pmu_irq_stats[9]++;
1334
1335         /* Hack to deal with ADB autopoll flag */
1336         if (ints & PMU_INT_ADB)
1337                 ints &= ~(PMU_INT_ADB_AUTO | PMU_INT_AUTO_SRQ_POLL);
1338
1339 next:
1340
1341         if (ints == 0) {
1342                 if (i > pmu_irq_stats[10])
1343                         pmu_irq_stats[10] = i;
1344                 return;
1345         }
1346
1347         for (pirq = 0; pirq < 8; pirq++)
1348                 if (ints & (1 << pirq))
1349                         break;
1350         pmu_irq_stats[pirq]++;
1351         i++;
1352         ints &= ~(1 << pirq);
1353
1354         /* Note: for some reason, we get an interrupt with len=1,
1355          * data[0]==0 after each normal ADB interrupt, at least
1356          * on the Pismo. Still investigating...  --BenH
1357          */
1358         if ((1 << pirq) & PMU_INT_ADB) {
1359                 if ((data[0] & PMU_INT_ADB_AUTO) == 0) {
1360                         struct adb_request *req = req_awaiting_reply;
1361                         if (req == 0) {
1362                                 printk(KERN_ERR "PMU: extra ADB reply\n");
1363                                 return;
1364                         }
1365                         req_awaiting_reply = NULL;
1366                         if (len <= 2)
1367                                 req->reply_len = 0;
1368                         else {
1369                                 memcpy(req->reply, data + 1, len - 1);
1370                                 req->reply_len = len - 1;
1371                         }
1372                         pmu_done(req);
1373                 } else {
1374                         if (len == 4 && data[1] == 0x2c) {
1375                                 extern int xmon_wants_key, xmon_adb_keycode;
1376                                 if (xmon_wants_key) {
1377                                         xmon_adb_keycode = data[2];
1378                                         return;
1379                                 }
1380                         }
1381 #ifdef CONFIG_ADB
1382                         /*
1383                          * XXX On the [23]400 the PMU gives us an up
1384                          * event for keycodes 0x74 or 0x75 when the PC
1385                          * card eject buttons are released, so we
1386                          * ignore those events.
1387                          */
1388                         if (!(pmu_kind == PMU_OHARE_BASED && len == 4
1389                               && data[1] == 0x2c && data[3] == 0xff
1390                               && (data[2] & ~1) == 0xf4))
1391                                 adb_input(data+1, len-1, regs, 1);
1392 #endif /* CONFIG_ADB */
1393                 }
1394         }
1395         /* Sound/brightness button pressed */
1396         else if ((1 << pirq) & PMU_INT_SNDBRT) {
1397 #ifdef CONFIG_PMAC_BACKLIGHT
1398                 if (len == 3)
1399                         pmac_backlight_set_legacy_brightness_pmu(data[1] >> 4);
1400 #endif
1401         }
1402         /* Tick interrupt */
1403         else if ((1 << pirq) & PMU_INT_TICK) {
1404                 /* Environement or tick interrupt, query batteries */
1405                 if (pmu_battery_count) {
1406                         if ((--query_batt_timer) == 0) {
1407                                 query_battery_state();
1408                                 query_batt_timer = BATTERY_POLLING_COUNT;
1409                         }
1410                 }
1411         }
1412         else if ((1 << pirq) & PMU_INT_ENVIRONMENT) {
1413                 if (pmu_battery_count)
1414                         query_battery_state();
1415                 pmu_pass_intr(data, len);
1416                 /* len == 6 is probably a bad check. But how do I
1417                  * know what PMU versions send what events here? */
1418                 if (len == 6) {
1419                         via_pmu_event(PMU_EVT_POWER, !!(data[1]&8));
1420                         via_pmu_event(PMU_EVT_LID, data[1]&1);
1421                 }
1422         } else {
1423                pmu_pass_intr(data, len);
1424         }
1425         goto next;
1426 }
1427
1428 static struct adb_request*
1429 pmu_sr_intr(struct pt_regs *regs)
1430 {
1431         struct adb_request *req;
1432         int bite = 0;
1433
1434         if (via[B] & TREQ) {
1435                 printk(KERN_ERR "PMU: spurious SR intr (%x)\n", via[B]);
1436                 out_8(&via[IFR], SR_INT);
1437                 return NULL;
1438         }
1439         /* The ack may not yet be low when we get the interrupt */
1440         while ((in_8(&via[B]) & TACK) != 0)
1441                         ;
1442
1443         /* if reading grab the byte, and reset the interrupt */
1444         if (pmu_state == reading || pmu_state == reading_intr)
1445                 bite = in_8(&via[SR]);
1446
1447         /* reset TREQ and wait for TACK to go high */
1448         out_8(&via[B], in_8(&via[B]) | TREQ);
1449         wait_for_ack();
1450
1451         switch (pmu_state) {
1452         case sending:
1453                 req = current_req;
1454                 if (data_len < 0) {
1455                         data_len = req->nbytes - 1;
1456                         send_byte(data_len);
1457                         break;
1458                 }
1459                 if (data_index <= data_len) {
1460                         send_byte(req->data[data_index++]);
1461                         break;
1462                 }
1463                 req->sent = 1;
1464                 data_len = pmu_data_len[req->data[0]][1];
1465                 if (data_len == 0) {
1466                         pmu_state = idle;
1467                         current_req = req->next;
1468                         if (req->reply_expected)
1469                                 req_awaiting_reply = req;
1470                         else
1471                                 return req;
1472                 } else {
1473                         pmu_state = reading;
1474                         data_index = 0;
1475                         reply_ptr = req->reply + req->reply_len;
1476                         recv_byte();
1477                 }
1478                 break;
1479
1480         case intack:
1481                 data_index = 0;
1482                 data_len = -1;
1483                 pmu_state = reading_intr;
1484                 reply_ptr = interrupt_data[int_data_last];
1485                 recv_byte();
1486                 if (gpio_irq >= 0 && !gpio_irq_enabled) {
1487                         enable_irq(gpio_irq);
1488                         gpio_irq_enabled = 1;
1489                 }
1490                 break;
1491
1492         case reading:
1493         case reading_intr:
1494                 if (data_len == -1) {
1495                         data_len = bite;
1496                         if (bite > 32)
1497                                 printk(KERN_ERR "PMU: bad reply len %d\n", bite);
1498                 } else if (data_index < 32) {
1499                         reply_ptr[data_index++] = bite;
1500                 }
1501                 if (data_index < data_len) {
1502                         recv_byte();
1503                         break;
1504                 }
1505
1506                 if (pmu_state == reading_intr) {
1507                         pmu_state = idle;
1508                         int_data_state[int_data_last] = int_data_ready;
1509                         interrupt_data_len[int_data_last] = data_len;
1510                 } else {
1511                         req = current_req;
1512                         /*
1513                          * For PMU sleep and freq change requests, we lock the
1514                          * PMU until it's explicitely unlocked. This avoids any
1515                          * spurrious event polling getting in
1516                          */
1517                         current_req = req->next;
1518                         req->reply_len += data_index;
1519                         if (req->data[0] == PMU_SLEEP || req->data[0] == PMU_CPU_SPEED)
1520                                 pmu_state = locked;
1521                         else
1522                                 pmu_state = idle;
1523                         return req;
1524                 }
1525                 break;
1526
1527         default:
1528                 printk(KERN_ERR "via_pmu_interrupt: unknown state %d?\n",
1529                        pmu_state);
1530         }
1531         return NULL;
1532 }
1533
1534 static irqreturn_t
1535 via_pmu_interrupt(int irq, void *arg, struct pt_regs *regs)
1536 {
1537         unsigned long flags;
1538         int intr;
1539         int nloop = 0;
1540         int int_data = -1;
1541         struct adb_request *req = NULL;
1542         int handled = 0;
1543
1544         /* This is a bit brutal, we can probably do better */
1545         spin_lock_irqsave(&pmu_lock, flags);
1546         ++disable_poll;
1547
1548         for (;;) {
1549                 intr = in_8(&via[IFR]) & (SR_INT | CB1_INT);
1550                 if (intr == 0)
1551                         break;
1552                 handled = 1;
1553                 if (++nloop > 1000) {
1554                         printk(KERN_DEBUG "PMU: stuck in intr loop, "
1555                                "intr=%x, ier=%x pmu_state=%d\n",
1556                                intr, in_8(&via[IER]), pmu_state);
1557                         break;
1558                 }
1559                 out_8(&via[IFR], intr);
1560                 if (intr & CB1_INT) {
1561                         adb_int_pending = 1;
1562                         pmu_irq_stats[0]++;
1563                 }
1564                 if (intr & SR_INT) {
1565                         req = pmu_sr_intr(regs);
1566                         if (req)
1567                                 break;
1568                 }
1569         }
1570
1571 recheck:
1572         if (pmu_state == idle) {
1573                 if (adb_int_pending) {
1574                         if (int_data_state[0] == int_data_empty)
1575                                 int_data_last = 0;
1576                         else if (int_data_state[1] == int_data_empty)
1577                                 int_data_last = 1;
1578                         else
1579                                 goto no_free_slot;
1580                         pmu_state = intack;
1581                         int_data_state[int_data_last] = int_data_fill;
1582                         /* Sounds safer to make sure ACK is high before writing.
1583                          * This helped kill a problem with ADB and some iBooks
1584                          */
1585                         wait_for_ack();
1586                         send_byte(PMU_INT_ACK);
1587                         adb_int_pending = 0;
1588                 } else if (current_req)
1589                         pmu_start();
1590         }
1591 no_free_slot:
1592         /* Mark the oldest buffer for flushing */
1593         if (int_data_state[!int_data_last] == int_data_ready) {
1594                 int_data_state[!int_data_last] = int_data_flush;
1595                 int_data = !int_data_last;
1596         } else if (int_data_state[int_data_last] == int_data_ready) {
1597                 int_data_state[int_data_last] = int_data_flush;
1598                 int_data = int_data_last;
1599         }
1600         --disable_poll;
1601         spin_unlock_irqrestore(&pmu_lock, flags);
1602
1603         /* Deal with completed PMU requests outside of the lock */
1604         if (req) {
1605                 pmu_done(req);
1606                 req = NULL;
1607         }
1608
1609         /* Deal with interrupt datas outside of the lock */
1610         if (int_data >= 0) {
1611                 pmu_handle_data(interrupt_data[int_data], interrupt_data_len[int_data], regs);
1612                 spin_lock_irqsave(&pmu_lock, flags);
1613                 ++disable_poll;
1614                 int_data_state[int_data] = int_data_empty;
1615                 int_data = -1;
1616                 goto recheck;
1617         }
1618
1619         return IRQ_RETVAL(handled);
1620 }
1621
1622 void
1623 pmu_unlock(void)
1624 {
1625         unsigned long flags;
1626
1627         spin_lock_irqsave(&pmu_lock, flags);
1628         if (pmu_state == locked)
1629                 pmu_state = idle;
1630         adb_int_pending = 1;
1631         spin_unlock_irqrestore(&pmu_lock, flags);
1632 }
1633
1634
1635 static irqreturn_t
1636 gpio1_interrupt(int irq, void *arg, struct pt_regs *regs)
1637 {
1638         unsigned long flags;
1639
1640         if ((in_8(gpio_reg + 0x9) & 0x02) == 0) {
1641                 spin_lock_irqsave(&pmu_lock, flags);
1642                 if (gpio_irq_enabled > 0) {
1643                         disable_irq_nosync(gpio_irq);
1644                         gpio_irq_enabled = 0;
1645                 }
1646                 pmu_irq_stats[1]++;
1647                 adb_int_pending = 1;
1648                 spin_unlock_irqrestore(&pmu_lock, flags);
1649                 via_pmu_interrupt(0, NULL, NULL);
1650                 return IRQ_HANDLED;
1651         }
1652         return IRQ_NONE;
1653 }
1654
1655 void
1656 pmu_enable_irled(int on)
1657 {
1658         struct adb_request req;
1659
1660         if (vias == NULL)
1661                 return ;
1662         if (pmu_kind == PMU_KEYLARGO_BASED)
1663                 return ;
1664
1665         pmu_request(&req, NULL, 2, PMU_POWER_CTRL, PMU_POW_IRLED |
1666             (on ? PMU_POW_ON : PMU_POW_OFF));
1667         pmu_wait_complete(&req);
1668 }
1669
1670 void
1671 pmu_restart(void)
1672 {
1673         struct adb_request req;
1674
1675         if (via == NULL)
1676                 return;
1677
1678         local_irq_disable();
1679
1680         drop_interrupts = 1;
1681
1682         if (pmu_kind != PMU_KEYLARGO_BASED) {
1683                 pmu_request(&req, NULL, 2, PMU_SET_INTR_MASK, PMU_INT_ADB |
1684                                                 PMU_INT_TICK );
1685                 while(!req.complete)
1686                         pmu_poll();
1687         }
1688
1689         pmu_request(&req, NULL, 1, PMU_RESET);
1690         pmu_wait_complete(&req);
1691         for (;;)
1692                 ;
1693 }
1694
1695 void
1696 pmu_shutdown(void)
1697 {
1698         struct adb_request req;
1699
1700         if (via == NULL)
1701                 return;
1702
1703         local_irq_disable();
1704
1705         drop_interrupts = 1;
1706
1707         if (pmu_kind != PMU_KEYLARGO_BASED) {
1708                 pmu_request(&req, NULL, 2, PMU_SET_INTR_MASK, PMU_INT_ADB |
1709                                                 PMU_INT_TICK );
1710                 pmu_wait_complete(&req);
1711         } else {
1712                 /* Disable server mode on shutdown or we'll just
1713                  * wake up again
1714                  */
1715                 pmu_set_server_mode(0);
1716         }
1717
1718         pmu_request(&req, NULL, 5, PMU_SHUTDOWN,
1719                     'M', 'A', 'T', 'T');
1720         pmu_wait_complete(&req);
1721         for (;;)
1722                 ;
1723 }
1724
1725 int
1726 pmu_present(void)
1727 {
1728         return via != 0;
1729 }
1730
1731 #ifdef CONFIG_PM
1732
1733 static LIST_HEAD(sleep_notifiers);
1734
1735 int
1736 pmu_register_sleep_notifier(struct pmu_sleep_notifier *n)
1737 {
1738         struct list_head *list;
1739         struct pmu_sleep_notifier *notifier;
1740
1741         for (list = sleep_notifiers.next; list != &sleep_notifiers;
1742              list = list->next) {
1743                 notifier = list_entry(list, struct pmu_sleep_notifier, list);
1744                 if (n->priority > notifier->priority)
1745                         break;
1746         }
1747         __list_add(&n->list, list->prev, list);
1748         return 0;
1749 }
1750 EXPORT_SYMBOL(pmu_register_sleep_notifier);
1751
1752 int
1753 pmu_unregister_sleep_notifier(struct pmu_sleep_notifier* n)
1754 {
1755         if (n->list.next == 0)
1756                 return -ENOENT;
1757         list_del(&n->list);
1758         n->list.next = NULL;
1759         return 0;
1760 }
1761 EXPORT_SYMBOL(pmu_unregister_sleep_notifier);
1762 #endif /* CONFIG_PM */
1763
1764 #if defined(CONFIG_PM) && defined(CONFIG_PPC32)
1765
1766 /* Sleep is broadcast last-to-first */
1767 static int
1768 broadcast_sleep(int when, int fallback)
1769 {
1770         int ret = PBOOK_SLEEP_OK;
1771         struct list_head *list;
1772         struct pmu_sleep_notifier *notifier;
1773
1774         for (list = sleep_notifiers.prev; list != &sleep_notifiers;
1775              list = list->prev) {
1776                 notifier = list_entry(list, struct pmu_sleep_notifier, list);
1777                 ret = notifier->notifier_call(notifier, when);
1778                 if (ret != PBOOK_SLEEP_OK) {
1779                         printk(KERN_DEBUG "sleep %d rejected by %p (%p)\n",
1780                                when, notifier, notifier->notifier_call);
1781                         for (; list != &sleep_notifiers; list = list->next) {
1782                                 notifier = list_entry(list, struct pmu_sleep_notifier, list);
1783                                 notifier->notifier_call(notifier, fallback);
1784                         }
1785                         return ret;
1786                 }
1787         }
1788         return ret;
1789 }
1790
1791 /* Wake is broadcast first-to-last */
1792 static int
1793 broadcast_wake(void)
1794 {
1795         int ret = PBOOK_SLEEP_OK;
1796         struct list_head *list;
1797         struct pmu_sleep_notifier *notifier;
1798
1799         for (list = sleep_notifiers.next; list != &sleep_notifiers;
1800              list = list->next) {
1801                 notifier = list_entry(list, struct pmu_sleep_notifier, list);
1802                 notifier->notifier_call(notifier, PBOOK_WAKE);
1803         }
1804         return ret;
1805 }
1806
1807 /*
1808  * This struct is used to store config register values for
1809  * PCI devices which may get powered off when we sleep.
1810  */
1811 static struct pci_save {
1812 #ifndef HACKED_PCI_SAVE
1813         u16     command;
1814         u16     cache_lat;
1815         u16     intr;
1816         u32     rom_address;
1817 #else
1818         u32     config[16];
1819 #endif
1820 } *pbook_pci_saves;
1821 static int pbook_npci_saves;
1822
1823 static void
1824 pbook_alloc_pci_save(void)
1825 {
1826         int npci;
1827         struct pci_dev *pd = NULL;
1828
1829         npci = 0;
1830         while ((pd = pci_find_device(PCI_ANY_ID, PCI_ANY_ID, pd)) != NULL) {
1831                 ++npci;
1832         }
1833         if (npci == 0)
1834                 return;
1835         pbook_pci_saves = (struct pci_save *)
1836                 kmalloc(npci * sizeof(struct pci_save), GFP_KERNEL);
1837         pbook_npci_saves = npci;
1838 }
1839
1840 static void
1841 pbook_free_pci_save(void)
1842 {
1843         if (pbook_pci_saves == NULL)
1844                 return;
1845         kfree(pbook_pci_saves);
1846         pbook_pci_saves = NULL;
1847         pbook_npci_saves = 0;
1848 }
1849
1850 static void
1851 pbook_pci_save(void)
1852 {
1853         struct pci_save *ps = pbook_pci_saves;
1854         struct pci_dev *pd = NULL;
1855         int npci = pbook_npci_saves;
1856
1857         if (ps == NULL)
1858                 return;
1859
1860         while ((pd = pci_find_device(PCI_ANY_ID, PCI_ANY_ID, pd)) != NULL) {
1861                 if (npci-- == 0)
1862                         return;
1863 #ifndef HACKED_PCI_SAVE
1864                 pci_read_config_word(pd, PCI_COMMAND, &ps->command);
1865                 pci_read_config_word(pd, PCI_CACHE_LINE_SIZE, &ps->cache_lat);
1866                 pci_read_config_word(pd, PCI_INTERRUPT_LINE, &ps->intr);
1867                 pci_read_config_dword(pd, PCI_ROM_ADDRESS, &ps->rom_address);
1868 #else
1869                 int i;
1870                 for (i=1;i<16;i++)
1871                         pci_read_config_dword(pd, i<<4, &ps->config[i]);
1872 #endif
1873                 ++ps;
1874         }
1875 }
1876
1877 /* For this to work, we must take care of a few things: If gmac was enabled
1878  * during boot, it will be in the pci dev list. If it's disabled at this point
1879  * (and it will probably be), then you can't access it's config space.
1880  */
1881 static void
1882 pbook_pci_restore(void)
1883 {
1884         u16 cmd;
1885         struct pci_save *ps = pbook_pci_saves - 1;
1886         struct pci_dev *pd = NULL;
1887         int npci = pbook_npci_saves;
1888         int j;
1889
1890         while ((pd = pci_find_device(PCI_ANY_ID, PCI_ANY_ID, pd)) != NULL) {
1891 #ifdef HACKED_PCI_SAVE
1892                 int i;
1893                 if (npci-- == 0)
1894                         return;
1895                 ps++;
1896                 for (i=2;i<16;i++)
1897                         pci_write_config_dword(pd, i<<4, ps->config[i]);
1898                 pci_write_config_dword(pd, 4, ps->config[1]);
1899 #else
1900                 if (npci-- == 0)
1901                         return;
1902                 ps++;
1903                 if (ps->command == 0)
1904                         continue;
1905                 pci_read_config_word(pd, PCI_COMMAND, &cmd);
1906                 if ((ps->command & ~cmd) == 0)
1907                         continue;
1908                 switch (pd->hdr_type) {
1909                 case PCI_HEADER_TYPE_NORMAL:
1910                         for (j = 0; j < 6; ++j)
1911                                 pci_write_config_dword(pd,
1912                                         PCI_BASE_ADDRESS_0 + j*4,
1913                                         pd->resource[j].start);
1914                         pci_write_config_dword(pd, PCI_ROM_ADDRESS,
1915                                 ps->rom_address);
1916                         pci_write_config_word(pd, PCI_CACHE_LINE_SIZE,
1917                                 ps->cache_lat);
1918                         pci_write_config_word(pd, PCI_INTERRUPT_LINE,
1919                                 ps->intr);
1920                         pci_write_config_word(pd, PCI_COMMAND, ps->command);
1921                         break;
1922                 }
1923 #endif
1924         }
1925 }
1926
1927 #ifdef DEBUG_SLEEP
1928 /* N.B. This doesn't work on the 3400 */
1929 void
1930 pmu_blink(int n)
1931 {
1932         struct adb_request req;
1933
1934         memset(&req, 0, sizeof(req));
1935
1936         for (; n > 0; --n) {
1937                 req.nbytes = 4;
1938                 req.done = NULL;
1939                 req.data[0] = 0xee;
1940                 req.data[1] = 4;
1941                 req.data[2] = 0;
1942                 req.data[3] = 1;
1943                 req.reply[0] = ADB_RET_OK;
1944                 req.reply_len = 1;
1945                 req.reply_expected = 0;
1946                 pmu_polled_request(&req);
1947                 mdelay(50);
1948                 req.nbytes = 4;
1949                 req.done = NULL;
1950                 req.data[0] = 0xee;
1951                 req.data[1] = 4;
1952                 req.data[2] = 0;
1953                 req.data[3] = 0;
1954                 req.reply[0] = ADB_RET_OK;
1955                 req.reply_len = 1;
1956                 req.reply_expected = 0;
1957                 pmu_polled_request(&req);
1958                 mdelay(50);
1959         }
1960         mdelay(50);
1961 }
1962 #endif
1963
1964 /*
1965  * Put the powerbook to sleep.
1966  */
1967
1968 static u32 save_via[8];
1969
1970 static void
1971 save_via_state(void)
1972 {
1973         save_via[0] = in_8(&via[ANH]);
1974         save_via[1] = in_8(&via[DIRA]);
1975         save_via[2] = in_8(&via[B]);
1976         save_via[3] = in_8(&via[DIRB]);
1977         save_via[4] = in_8(&via[PCR]);
1978         save_via[5] = in_8(&via[ACR]);
1979         save_via[6] = in_8(&via[T1CL]);
1980         save_via[7] = in_8(&via[T1CH]);
1981 }
1982 static void
1983 restore_via_state(void)
1984 {
1985         out_8(&via[ANH], save_via[0]);
1986         out_8(&via[DIRA], save_via[1]);
1987         out_8(&via[B], save_via[2]);
1988         out_8(&via[DIRB], save_via[3]);
1989         out_8(&via[PCR], save_via[4]);
1990         out_8(&via[ACR], save_via[5]);
1991         out_8(&via[T1CL], save_via[6]);
1992         out_8(&via[T1CH], save_via[7]);
1993         out_8(&via[IER], IER_CLR | 0x7f);       /* disable all intrs */
1994         out_8(&via[IFR], 0x7f);                         /* clear IFR */
1995         out_8(&via[IER], IER_SET | SR_INT | CB1_INT);
1996 }
1997
1998 extern void pmu_backlight_set_sleep(int sleep);
1999
2000 static int
2001 pmac_suspend_devices(void)
2002 {
2003         int ret;
2004
2005         pm_prepare_console();
2006
2007         /* Notify old-style device drivers & userland */
2008         ret = broadcast_sleep(PBOOK_SLEEP_REQUEST, PBOOK_SLEEP_REJECT);
2009         if (ret != PBOOK_SLEEP_OK) {
2010                 printk(KERN_ERR "Sleep rejected by drivers\n");
2011                 return -EBUSY;
2012         }
2013
2014         /* Sync the disks. */
2015         /* XXX It would be nice to have some way to ensure that
2016          * nobody is dirtying any new buffers while we wait. That
2017          * could be achieved using the refrigerator for processes
2018          * that swsusp uses
2019          */
2020         sys_sync();
2021
2022         /* Sleep can fail now. May not be very robust but useful for debugging */
2023         ret = broadcast_sleep(PBOOK_SLEEP_NOW, PBOOK_WAKE);
2024         if (ret != PBOOK_SLEEP_OK) {
2025                 printk(KERN_ERR "Driver sleep failed\n");
2026                 return -EBUSY;
2027         }
2028
2029         /* Send suspend call to devices, hold the device core's dpm_sem */
2030         ret = device_suspend(PMSG_SUSPEND);
2031         if (ret) {
2032                 broadcast_wake();
2033                 printk(KERN_ERR "Driver sleep failed\n");
2034                 return -EBUSY;
2035         }
2036
2037 #ifdef CONFIG_PMAC_BACKLIGHT
2038         /* Tell backlight code not to muck around with the chip anymore */
2039         pmu_backlight_set_sleep(1);
2040 #endif
2041
2042         /* Call platform functions marked "on sleep" */
2043         pmac_pfunc_i2c_suspend();
2044         pmac_pfunc_base_suspend();
2045
2046         /* Stop preemption */
2047         preempt_disable();
2048
2049         /* Make sure the decrementer won't interrupt us */
2050         asm volatile("mtdec %0" : : "r" (0x7fffffff));
2051         /* Make sure any pending DEC interrupt occurring while we did
2052          * the above didn't re-enable the DEC */
2053         mb();
2054         asm volatile("mtdec %0" : : "r" (0x7fffffff));
2055
2056         /* We can now disable MSR_EE. This code of course works properly only
2057          * on UP machines... For SMP, if we ever implement sleep, we'll have to
2058          * stop the "other" CPUs way before we do all that stuff.
2059          */
2060         local_irq_disable();
2061
2062         /* Broadcast power down irq
2063          * This isn't that useful in most cases (only directly wired devices can
2064          * use this but still... This will take care of sysdev's as well, so
2065          * we exit from here with local irqs disabled and PIC off.
2066          */
2067         ret = device_power_down(PMSG_SUSPEND);
2068         if (ret) {
2069                 wakeup_decrementer();
2070                 local_irq_enable();
2071                 preempt_enable();
2072                 device_resume();
2073                 broadcast_wake();
2074                 printk(KERN_ERR "Driver powerdown failed\n");
2075                 return -EBUSY;
2076         }
2077
2078         /* Wait for completion of async requests */
2079         while (!batt_req.complete)
2080                 pmu_poll();
2081
2082         /* Giveup the lazy FPU & vec so we don't have to back them
2083          * up from the low level code
2084          */
2085         enable_kernel_fp();
2086
2087 #ifdef CONFIG_ALTIVEC
2088         if (cpu_has_feature(CPU_FTR_ALTIVEC))
2089                 enable_kernel_altivec();
2090 #endif /* CONFIG_ALTIVEC */
2091
2092         return 0;
2093 }
2094
2095 static int
2096 pmac_wakeup_devices(void)
2097 {
2098         mdelay(100);
2099
2100 #ifdef CONFIG_PMAC_BACKLIGHT
2101         /* Tell backlight code it can use the chip again */
2102         pmu_backlight_set_sleep(0);
2103 #endif
2104
2105         /* Power back up system devices (including the PIC) */
2106         device_power_up();
2107
2108         /* Force a poll of ADB interrupts */
2109         adb_int_pending = 1;
2110         via_pmu_interrupt(0, NULL, NULL);
2111
2112         /* Restart jiffies & scheduling */
2113         wakeup_decrementer();
2114
2115         /* Re-enable local CPU interrupts */
2116         local_irq_enable();
2117         mdelay(10);
2118         preempt_enable();
2119
2120         /* Call platform functions marked "on wake" */
2121         pmac_pfunc_base_resume();
2122         pmac_pfunc_i2c_resume();
2123
2124         /* Resume devices */
2125         device_resume();
2126
2127         /* Notify old style drivers */
2128         broadcast_wake();
2129
2130         pm_restore_console();
2131
2132         return 0;
2133 }
2134
2135 #define GRACKLE_PM      (1<<7)
2136 #define GRACKLE_DOZE    (1<<5)
2137 #define GRACKLE_NAP     (1<<4)
2138 #define GRACKLE_SLEEP   (1<<3)
2139
2140 static int powerbook_sleep_grackle(void)
2141 {
2142         unsigned long save_l2cr;
2143         unsigned short pmcr1;
2144         struct adb_request req;
2145         int ret;
2146         struct pci_dev *grackle;
2147
2148         grackle = pci_find_slot(0, 0);
2149         if (!grackle)
2150                 return -ENODEV;
2151
2152         ret = pmac_suspend_devices();
2153         if (ret) {
2154                 printk(KERN_ERR "Sleep rejected by devices\n");
2155                 return ret;
2156         }
2157
2158         /* Turn off various things. Darwin does some retry tests here... */
2159         pmu_request(&req, NULL, 2, PMU_POWER_CTRL0, PMU_POW0_OFF|PMU_POW0_HARD_DRIVE);
2160         pmu_wait_complete(&req);
2161         pmu_request(&req, NULL, 2, PMU_POWER_CTRL,
2162                 PMU_POW_OFF|PMU_POW_BACKLIGHT|PMU_POW_IRLED|PMU_POW_MEDIABAY);
2163         pmu_wait_complete(&req);
2164
2165         /* For 750, save backside cache setting and disable it */
2166         save_l2cr = _get_L2CR();        /* (returns -1 if not available) */
2167
2168         if (!__fake_sleep) {
2169                 /* Ask the PMU to put us to sleep */
2170                 pmu_request(&req, NULL, 5, PMU_SLEEP, 'M', 'A', 'T', 'T');
2171                 pmu_wait_complete(&req);
2172         }
2173
2174         /* The VIA is supposed not to be restored correctly*/
2175         save_via_state();
2176         /* We shut down some HW */
2177         pmac_call_feature(PMAC_FTR_SLEEP_STATE,NULL,0,1);
2178
2179         pci_read_config_word(grackle, 0x70, &pmcr1);
2180         /* Apparently, MacOS uses NAP mode for Grackle ??? */
2181         pmcr1 &= ~(GRACKLE_DOZE|GRACKLE_SLEEP);
2182         pmcr1 |= GRACKLE_PM|GRACKLE_NAP;
2183         pci_write_config_word(grackle, 0x70, pmcr1);
2184
2185         /* Call low-level ASM sleep handler */
2186         if (__fake_sleep)
2187                 mdelay(5000);
2188         else
2189                 low_sleep_handler();
2190
2191         /* We're awake again, stop grackle PM */
2192         pci_read_config_word(grackle, 0x70, &pmcr1);
2193         pmcr1 &= ~(GRACKLE_PM|GRACKLE_DOZE|GRACKLE_SLEEP|GRACKLE_NAP);
2194         pci_write_config_word(grackle, 0x70, pmcr1);
2195
2196         /* Make sure the PMU is idle */
2197         pmac_call_feature(PMAC_FTR_SLEEP_STATE,NULL,0,0);
2198         restore_via_state();
2199
2200         /* Restore L2 cache */
2201         if (save_l2cr != 0xffffffff && (save_l2cr & L2CR_L2E) != 0)
2202                 _set_L2CR(save_l2cr);
2203
2204         /* Restore userland MMU context */
2205         set_context(current->active_mm->context.id, current->active_mm->pgd);
2206
2207         /* Power things up */
2208         pmu_unlock();
2209         pmu_request(&req, NULL, 2, PMU_SET_INTR_MASK, pmu_intr_mask);
2210         pmu_wait_complete(&req);
2211         pmu_request(&req, NULL, 2, PMU_POWER_CTRL0,
2212                         PMU_POW0_ON|PMU_POW0_HARD_DRIVE);
2213         pmu_wait_complete(&req);
2214         pmu_request(&req, NULL, 2, PMU_POWER_CTRL,
2215                         PMU_POW_ON|PMU_POW_BACKLIGHT|PMU_POW_CHARGER|PMU_POW_IRLED|PMU_POW_MEDIABAY);
2216         pmu_wait_complete(&req);
2217
2218         pmac_wakeup_devices();
2219
2220         return 0;
2221 }
2222
2223 static int
2224 powerbook_sleep_Core99(void)
2225 {
2226         unsigned long save_l2cr;
2227         unsigned long save_l3cr;
2228         struct adb_request req;
2229         int ret;
2230
2231         if (pmac_call_feature(PMAC_FTR_SLEEP_STATE,NULL,0,-1) < 0) {
2232                 printk(KERN_ERR "Sleep mode not supported on this machine\n");
2233                 return -ENOSYS;
2234         }
2235
2236         if (num_online_cpus() > 1 || cpu_is_offline(0))
2237                 return -EAGAIN;
2238
2239         ret = pmac_suspend_devices();
2240         if (ret) {
2241                 printk(KERN_ERR "Sleep rejected by devices\n");
2242                 return ret;
2243         }
2244
2245         /* Stop environment and ADB interrupts */
2246         pmu_request(&req, NULL, 2, PMU_SET_INTR_MASK, 0);
2247         pmu_wait_complete(&req);
2248
2249         /* Tell PMU what events will wake us up */
2250         pmu_request(&req, NULL, 4, PMU_POWER_EVENTS, PMU_PWR_CLR_WAKEUP_EVENTS,
2251                 0xff, 0xff);
2252         pmu_wait_complete(&req);
2253         pmu_request(&req, NULL, 4, PMU_POWER_EVENTS, PMU_PWR_SET_WAKEUP_EVENTS,
2254                 0, PMU_PWR_WAKEUP_KEY |
2255                 (option_lid_wakeup ? PMU_PWR_WAKEUP_LID_OPEN : 0));
2256         pmu_wait_complete(&req);
2257
2258         /* Save the state of the L2 and L3 caches */
2259         save_l3cr = _get_L3CR();        /* (returns -1 if not available) */
2260         save_l2cr = _get_L2CR();        /* (returns -1 if not available) */
2261
2262         if (!__fake_sleep) {
2263                 /* Ask the PMU to put us to sleep */
2264                 pmu_request(&req, NULL, 5, PMU_SLEEP, 'M', 'A', 'T', 'T');
2265                 pmu_wait_complete(&req);
2266         }
2267
2268         /* The VIA is supposed not to be restored correctly*/
2269         save_via_state();
2270
2271         /* Shut down various ASICs. There's a chance that we can no longer
2272          * talk to the PMU after this, so I moved it to _after_ sending the
2273          * sleep command to it. Still need to be checked.
2274          */
2275         pmac_call_feature(PMAC_FTR_SLEEP_STATE, NULL, 0, 1);
2276
2277         /* Call low-level ASM sleep handler */
2278         if (__fake_sleep)
2279                 mdelay(5000);
2280         else
2281                 low_sleep_handler();
2282
2283         /* Restore Apple core ASICs state */
2284         pmac_call_feature(PMAC_FTR_SLEEP_STATE, NULL, 0, 0);
2285
2286         /* Restore VIA */
2287         restore_via_state();
2288
2289         /* tweak LPJ before cpufreq is there */
2290         loops_per_jiffy *= 2;
2291
2292         /* Restore video */
2293         pmac_call_early_video_resume();
2294
2295         /* Restore L2 cache */
2296         if (save_l2cr != 0xffffffff && (save_l2cr & L2CR_L2E) != 0)
2297                 _set_L2CR(save_l2cr);
2298         /* Restore L3 cache */
2299         if (save_l3cr != 0xffffffff && (save_l3cr & L3CR_L3E) != 0)
2300                 _set_L3CR(save_l3cr);
2301
2302         /* Restore userland MMU context */
2303         set_context(current->active_mm->context.id, current->active_mm->pgd);
2304
2305         /* Tell PMU we are ready */
2306         pmu_unlock();
2307         pmu_request(&req, NULL, 2, PMU_SYSTEM_READY, 2);
2308         pmu_wait_complete(&req);
2309         pmu_request(&req, NULL, 2, PMU_SET_INTR_MASK, pmu_intr_mask);
2310         pmu_wait_complete(&req);
2311
2312         /* Restore LPJ, cpufreq will adjust the cpu frequency */
2313         loops_per_jiffy /= 2;
2314
2315         pmac_wakeup_devices();
2316
2317         return 0;
2318 }
2319
2320 #define PB3400_MEM_CTRL         0xf8000000
2321 #define PB3400_MEM_CTRL_SLEEP   0x70
2322
2323 static int
2324 powerbook_sleep_3400(void)
2325 {
2326         int ret, i, x;
2327         unsigned int hid0;
2328         unsigned long p;
2329         struct adb_request sleep_req;
2330         void __iomem *mem_ctrl;
2331         unsigned int __iomem *mem_ctrl_sleep;
2332
2333         /* first map in the memory controller registers */
2334         mem_ctrl = ioremap(PB3400_MEM_CTRL, 0x100);
2335         if (mem_ctrl == NULL) {
2336                 printk("powerbook_sleep_3400: ioremap failed\n");
2337                 return -ENOMEM;
2338         }
2339         mem_ctrl_sleep = mem_ctrl + PB3400_MEM_CTRL_SLEEP;
2340
2341         /* Allocate room for PCI save */
2342         pbook_alloc_pci_save();
2343
2344         ret = pmac_suspend_devices();
2345         if (ret) {
2346                 pbook_free_pci_save();
2347                 printk(KERN_ERR "Sleep rejected by devices\n");
2348                 return ret;
2349         }
2350
2351         /* Save the state of PCI config space for some slots */
2352         pbook_pci_save();
2353
2354         /* Set the memory controller to keep the memory refreshed
2355            while we're asleep */
2356         for (i = 0x403f; i >= 0x4000; --i) {
2357                 out_be32(mem_ctrl_sleep, i);
2358                 do {
2359                         x = (in_be32(mem_ctrl_sleep) >> 16) & 0x3ff;
2360                 } while (x == 0);
2361                 if (x >= 0x100)
2362                         break;
2363         }
2364
2365         /* Ask the PMU to put us to sleep */
2366         pmu_request(&sleep_req, NULL, 5, PMU_SLEEP, 'M', 'A', 'T', 'T');
2367         while (!sleep_req.complete)
2368                 mb();
2369
2370         pmac_call_feature(PMAC_FTR_SLEEP_STATE,NULL,0,1);
2371
2372         /* displacement-flush the L2 cache - necessary? */
2373         for (p = KERNELBASE; p < KERNELBASE + 0x100000; p += 0x1000)
2374                 i = *(volatile int *)p;
2375         asleep = 1;
2376
2377         /* Put the CPU into sleep mode */
2378         hid0 = mfspr(SPRN_HID0);
2379         hid0 = (hid0 & ~(HID0_NAP | HID0_DOZE)) | HID0_SLEEP;
2380         mtspr(SPRN_HID0, hid0);
2381         mtmsr(mfmsr() | MSR_POW | MSR_EE);
2382         udelay(10);
2383
2384         /* OK, we're awake again, start restoring things */
2385         out_be32(mem_ctrl_sleep, 0x3f);
2386         pmac_call_feature(PMAC_FTR_SLEEP_STATE,NULL,0,0);
2387         pbook_pci_restore();
2388         pmu_unlock();
2389
2390         /* wait for the PMU interrupt sequence to complete */
2391         while (asleep)
2392                 mb();
2393
2394         pmac_wakeup_devices();
2395         pbook_free_pci_save();
2396         iounmap(mem_ctrl);
2397
2398         return 0;
2399 }
2400
2401 #endif /* CONFIG_PM && CONFIG_PPC32 */
2402
2403 /*
2404  * Support for /dev/pmu device
2405  */
2406 #define RB_SIZE         0x10
2407 struct pmu_private {
2408         struct list_head list;
2409         int     rb_get;
2410         int     rb_put;
2411         struct rb_entry {
2412                 unsigned short len;
2413                 unsigned char data[16];
2414         }       rb_buf[RB_SIZE];
2415         wait_queue_head_t wait;
2416         spinlock_t lock;
2417 #if defined(CONFIG_INPUT_ADBHID) && defined(CONFIG_PMAC_BACKLIGHT)
2418         int     backlight_locker;
2419 #endif
2420 };
2421
2422 static LIST_HEAD(all_pmu_pvt);
2423 static DEFINE_SPINLOCK(all_pvt_lock);
2424
2425 static void
2426 pmu_pass_intr(unsigned char *data, int len)
2427 {
2428         struct pmu_private *pp;
2429         struct list_head *list;
2430         int i;
2431         unsigned long flags;
2432
2433         if (len > sizeof(pp->rb_buf[0].data))
2434                 len = sizeof(pp->rb_buf[0].data);
2435         spin_lock_irqsave(&all_pvt_lock, flags);
2436         for (list = &all_pmu_pvt; (list = list->next) != &all_pmu_pvt; ) {
2437                 pp = list_entry(list, struct pmu_private, list);
2438                 spin_lock(&pp->lock);
2439                 i = pp->rb_put + 1;
2440                 if (i >= RB_SIZE)
2441                         i = 0;
2442                 if (i != pp->rb_get) {
2443                         struct rb_entry *rp = &pp->rb_buf[pp->rb_put];
2444                         rp->len = len;
2445                         memcpy(rp->data, data, len);
2446                         pp->rb_put = i;
2447                         wake_up_interruptible(&pp->wait);
2448                 }
2449                 spin_unlock(&pp->lock);
2450         }
2451         spin_unlock_irqrestore(&all_pvt_lock, flags);
2452 }
2453
2454 static int
2455 pmu_open(struct inode *inode, struct file *file)
2456 {
2457         struct pmu_private *pp;
2458         unsigned long flags;
2459
2460         pp = kmalloc(sizeof(struct pmu_private), GFP_KERNEL);
2461         if (pp == 0)
2462                 return -ENOMEM;
2463         pp->rb_get = pp->rb_put = 0;
2464         spin_lock_init(&pp->lock);
2465         init_waitqueue_head(&pp->wait);
2466         spin_lock_irqsave(&all_pvt_lock, flags);
2467 #if defined(CONFIG_INPUT_ADBHID) && defined(CONFIG_PMAC_BACKLIGHT)
2468         pp->backlight_locker = 0;
2469 #endif
2470         list_add(&pp->list, &all_pmu_pvt);
2471         spin_unlock_irqrestore(&all_pvt_lock, flags);
2472         file->private_data = pp;
2473         return 0;
2474 }
2475
2476 static ssize_t
2477 pmu_read(struct file *file, char __user *buf,
2478                         size_t count, loff_t *ppos)
2479 {
2480         struct pmu_private *pp = file->private_data;
2481         DECLARE_WAITQUEUE(wait, current);
2482         unsigned long flags;
2483         int ret = 0;
2484
2485         if (count < 1 || pp == 0)
2486                 return -EINVAL;
2487         if (!access_ok(VERIFY_WRITE, buf, count))
2488                 return -EFAULT;
2489
2490         spin_lock_irqsave(&pp->lock, flags);
2491         add_wait_queue(&pp->wait, &wait);
2492         current->state = TASK_INTERRUPTIBLE;
2493
2494         for (;;) {
2495                 ret = -EAGAIN;
2496                 if (pp->rb_get != pp->rb_put) {
2497                         int i = pp->rb_get;
2498                         struct rb_entry *rp = &pp->rb_buf[i];
2499                         ret = rp->len;
2500                         spin_unlock_irqrestore(&pp->lock, flags);
2501                         if (ret > count)
2502                                 ret = count;
2503                         if (ret > 0 && copy_to_user(buf, rp->data, ret))
2504                                 ret = -EFAULT;
2505                         if (++i >= RB_SIZE)
2506                                 i = 0;
2507                         spin_lock_irqsave(&pp->lock, flags);
2508                         pp->rb_get = i;
2509                 }
2510                 if (ret >= 0)
2511                         break;
2512                 if (file->f_flags & O_NONBLOCK)
2513                         break;
2514                 ret = -ERESTARTSYS;
2515                 if (signal_pending(current))
2516                         break;
2517                 spin_unlock_irqrestore(&pp->lock, flags);
2518                 schedule();
2519                 spin_lock_irqsave(&pp->lock, flags);
2520         }
2521         current->state = TASK_RUNNING;
2522         remove_wait_queue(&pp->wait, &wait);
2523         spin_unlock_irqrestore(&pp->lock, flags);
2524
2525         return ret;
2526 }
2527
2528 static ssize_t
2529 pmu_write(struct file *file, const char __user *buf,
2530                          size_t count, loff_t *ppos)
2531 {
2532         return 0;
2533 }
2534
2535 static unsigned int
2536 pmu_fpoll(struct file *filp, poll_table *wait)
2537 {
2538         struct pmu_private *pp = filp->private_data;
2539         unsigned int mask = 0;
2540         unsigned long flags;
2541
2542         if (pp == 0)
2543                 return 0;
2544         poll_wait(filp, &pp->wait, wait);
2545         spin_lock_irqsave(&pp->lock, flags);
2546         if (pp->rb_get != pp->rb_put)
2547                 mask |= POLLIN;
2548         spin_unlock_irqrestore(&pp->lock, flags);
2549         return mask;
2550 }
2551
2552 static int
2553 pmu_release(struct inode *inode, struct file *file)
2554 {
2555         struct pmu_private *pp = file->private_data;
2556         unsigned long flags;
2557
2558         lock_kernel();
2559         if (pp != 0) {
2560                 file->private_data = NULL;
2561                 spin_lock_irqsave(&all_pvt_lock, flags);
2562                 list_del(&pp->list);
2563                 spin_unlock_irqrestore(&all_pvt_lock, flags);
2564
2565 #if defined(CONFIG_INPUT_ADBHID) && defined(CONFIG_PMAC_BACKLIGHT)
2566                 if (pp->backlight_locker)
2567                         pmac_backlight_enable();
2568 #endif
2569
2570                 kfree(pp);
2571         }
2572         unlock_kernel();
2573         return 0;
2574 }
2575
2576 static int
2577 pmu_ioctl(struct inode * inode, struct file *filp,
2578                      u_int cmd, u_long arg)
2579 {
2580         __u32 __user *argp = (__u32 __user *)arg;
2581         int error = -EINVAL;
2582
2583         switch (cmd) {
2584 #if defined(CONFIG_PM) && defined(CONFIG_PPC32)
2585         case PMU_IOC_SLEEP:
2586                 if (!capable(CAP_SYS_ADMIN))
2587                         return -EACCES;
2588                 if (sleep_in_progress)
2589                         return -EBUSY;
2590                 sleep_in_progress = 1;
2591                 switch (pmu_kind) {
2592                 case PMU_OHARE_BASED:
2593                         error = powerbook_sleep_3400();
2594                         break;
2595                 case PMU_HEATHROW_BASED:
2596                 case PMU_PADDINGTON_BASED:
2597                         error = powerbook_sleep_grackle();
2598                         break;
2599                 case PMU_KEYLARGO_BASED:
2600                         error = powerbook_sleep_Core99();
2601                         break;
2602                 default:
2603                         error = -ENOSYS;
2604                 }
2605                 sleep_in_progress = 0;
2606                 break;
2607         case PMU_IOC_CAN_SLEEP:
2608                 if (pmac_call_feature(PMAC_FTR_SLEEP_STATE,NULL,0,-1) < 0)
2609                         return put_user(0, argp);
2610                 else
2611                         return put_user(1, argp);
2612 #endif /* CONFIG_PM && CONFIG_PPC32 */
2613
2614 #ifdef CONFIG_PMAC_BACKLIGHT_LEGACY
2615         /* Compatibility ioctl's for backlight */
2616         case PMU_IOC_GET_BACKLIGHT:
2617         {
2618                 int brightness;
2619
2620                 if (sleep_in_progress)
2621                         return -EBUSY;
2622
2623                 brightness = pmac_backlight_get_legacy_brightness();
2624                 if (brightness < 0)
2625                         return brightness;
2626                 else
2627                         return put_user(brightness, argp);
2628
2629         }
2630         case PMU_IOC_SET_BACKLIGHT:
2631         {
2632                 int brightness;
2633
2634                 if (sleep_in_progress)
2635                         return -EBUSY;
2636
2637                 error = get_user(brightness, argp);
2638                 if (error)
2639                         return error;
2640
2641                 return pmac_backlight_set_legacy_brightness(brightness);
2642         }
2643 #ifdef CONFIG_INPUT_ADBHID
2644         case PMU_IOC_GRAB_BACKLIGHT: {
2645                 struct pmu_private *pp = filp->private_data;
2646
2647                 if (pp->backlight_locker)
2648                         return 0;
2649
2650                 pp->backlight_locker = 1;
2651                 pmac_backlight_disable();
2652
2653                 return 0;
2654         }
2655 #endif /* CONFIG_INPUT_ADBHID */
2656 #endif /* CONFIG_PMAC_BACKLIGHT_LEGACY */
2657
2658         case PMU_IOC_GET_MODEL:
2659                 return put_user(pmu_kind, argp);
2660         case PMU_IOC_HAS_ADB:
2661                 return put_user(pmu_has_adb, argp);
2662         }
2663         return error;
2664 }
2665
2666 static struct file_operations pmu_device_fops = {
2667         .read           = pmu_read,
2668         .write          = pmu_write,
2669         .poll           = pmu_fpoll,
2670         .ioctl          = pmu_ioctl,
2671         .open           = pmu_open,
2672         .release        = pmu_release,
2673 };
2674
2675 static struct miscdevice pmu_device = {
2676         PMU_MINOR, "pmu", &pmu_device_fops
2677 };
2678
2679 static int pmu_device_init(void)
2680 {
2681         if (!via)
2682                 return 0;
2683         if (misc_register(&pmu_device) < 0)
2684                 printk(KERN_ERR "via-pmu: cannot register misc device.\n");
2685         return 0;
2686 }
2687 device_initcall(pmu_device_init);
2688
2689
2690 #ifdef DEBUG_SLEEP
2691 static inline void
2692 polled_handshake(volatile unsigned char __iomem *via)
2693 {
2694         via[B] &= ~TREQ; eieio();
2695         while ((via[B] & TACK) != 0)
2696                 ;
2697         via[B] |= TREQ; eieio();
2698         while ((via[B] & TACK) == 0)
2699                 ;
2700 }
2701
2702 static inline void
2703 polled_send_byte(volatile unsigned char __iomem *via, int x)
2704 {
2705         via[ACR] |= SR_OUT | SR_EXT; eieio();
2706         via[SR] = x; eieio();
2707         polled_handshake(via);
2708 }
2709
2710 static inline int
2711 polled_recv_byte(volatile unsigned char __iomem *via)
2712 {
2713         int x;
2714
2715         via[ACR] = (via[ACR] & ~SR_OUT) | SR_EXT; eieio();
2716         x = via[SR]; eieio();
2717         polled_handshake(via);
2718         x = via[SR]; eieio();
2719         return x;
2720 }
2721
2722 int
2723 pmu_polled_request(struct adb_request *req)
2724 {
2725         unsigned long flags;
2726         int i, l, c;
2727         volatile unsigned char __iomem *v = via;
2728
2729         req->complete = 1;
2730         c = req->data[0];
2731         l = pmu_data_len[c][0];
2732         if (l >= 0 && req->nbytes != l + 1)
2733                 return -EINVAL;
2734
2735         local_irq_save(flags);
2736         while (pmu_state != idle)
2737                 pmu_poll();
2738
2739         while ((via[B] & TACK) == 0)
2740                 ;
2741         polled_send_byte(v, c);
2742         if (l < 0) {
2743                 l = req->nbytes - 1;
2744                 polled_send_byte(v, l);
2745         }
2746         for (i = 1; i <= l; ++i)
2747                 polled_send_byte(v, req->data[i]);
2748
2749         l = pmu_data_len[c][1];
2750         if (l < 0)
2751                 l = polled_recv_byte(v);
2752         for (i = 0; i < l; ++i)
2753                 req->reply[i + req->reply_len] = polled_recv_byte(v);
2754
2755         if (req->done)
2756                 (*req->done)(req);
2757
2758         local_irq_restore(flags);
2759         return 0;
2760 }
2761 #endif /* DEBUG_SLEEP */
2762
2763
2764 /* FIXME: This is a temporary set of callbacks to enable us
2765  * to do suspend-to-disk.
2766  */
2767
2768 #if defined(CONFIG_PM) && defined(CONFIG_PPC32)
2769
2770 static int pmu_sys_suspended = 0;
2771
2772 static int pmu_sys_suspend(struct sys_device *sysdev, pm_message_t state)
2773 {
2774         if (state.event != PM_EVENT_SUSPEND || pmu_sys_suspended)
2775                 return 0;
2776
2777         /* Suspend PMU event interrupts */
2778         pmu_suspend();
2779
2780         pmu_sys_suspended = 1;
2781         return 0;
2782 }
2783
2784 static int pmu_sys_resume(struct sys_device *sysdev)
2785 {
2786         struct adb_request req;
2787
2788         if (!pmu_sys_suspended)
2789                 return 0;
2790
2791         /* Tell PMU we are ready */
2792         pmu_request(&req, NULL, 2, PMU_SYSTEM_READY, 2);
2793         pmu_wait_complete(&req);
2794
2795         /* Resume PMU event interrupts */
2796         pmu_resume();
2797
2798         pmu_sys_suspended = 0;
2799
2800         return 0;
2801 }
2802
2803 #endif /* CONFIG_PM && CONFIG_PPC32 */
2804
2805 static struct sysdev_class pmu_sysclass = {
2806         set_kset_name("pmu"),
2807 };
2808
2809 static struct sys_device device_pmu = {
2810         .id             = 0,
2811         .cls            = &pmu_sysclass,
2812 };
2813
2814 static struct sysdev_driver driver_pmu = {
2815 #if defined(CONFIG_PM) && defined(CONFIG_PPC32)
2816         .suspend        = &pmu_sys_suspend,
2817         .resume         = &pmu_sys_resume,
2818 #endif /* CONFIG_PM && CONFIG_PPC32 */
2819 };
2820
2821 static int __init init_pmu_sysfs(void)
2822 {
2823         int rc;
2824
2825         rc = sysdev_class_register(&pmu_sysclass);
2826         if (rc) {
2827                 printk(KERN_ERR "Failed registering PMU sys class\n");
2828                 return -ENODEV;
2829         }
2830         rc = sysdev_register(&device_pmu);
2831         if (rc) {
2832                 printk(KERN_ERR "Failed registering PMU sys device\n");
2833                 return -ENODEV;
2834         }
2835         rc = sysdev_driver_register(&pmu_sysclass, &driver_pmu);
2836         if (rc) {
2837                 printk(KERN_ERR "Failed registering PMU sys driver\n");
2838                 return -ENODEV;
2839         }
2840         return 0;
2841 }
2842
2843 subsys_initcall(init_pmu_sysfs);
2844
2845 EXPORT_SYMBOL(pmu_request);
2846 EXPORT_SYMBOL(pmu_queue_request);
2847 EXPORT_SYMBOL(pmu_poll);
2848 EXPORT_SYMBOL(pmu_poll_adb);
2849 EXPORT_SYMBOL(pmu_wait_complete);
2850 EXPORT_SYMBOL(pmu_suspend);
2851 EXPORT_SYMBOL(pmu_resume);
2852 EXPORT_SYMBOL(pmu_unlock);
2853 #if defined(CONFIG_PM) && defined(CONFIG_PPC32)
2854 EXPORT_SYMBOL(pmu_enable_irled);
2855 EXPORT_SYMBOL(pmu_battery_count);
2856 EXPORT_SYMBOL(pmu_batteries);
2857 EXPORT_SYMBOL(pmu_power_flags);
2858 #endif /* CONFIG_PM && CONFIG_PPC32 */
2859