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   1 /*
   2  * drivers/usb/host/ohci-pnx4008.c
   3  *
   4  * driver for Philips PNX4008 USB Host
   5  *
   6  * Authors: Dmitry Chigirev <source@mvista.com>
   7  *          Vitaly Wool <vitalywool@gmail.com>
   8  *
   9  * register initialization is based on code examples provided by Philips
  10  * Copyright (c) 2005 Koninklijke Philips Electronics N.V.
  11  *
  12  * NOTE: This driver does not have suspend/resume functionality
  13  * This driver is intended for engineering development purposes only
  14  *
  15  * 2005-2006 (c) MontaVista Software, Inc. This file is licensed under
  16  * the terms of the GNU General Public License version 2. This program
  17  * is licensed "as is" without any warranty of any kind, whether express
  18  * or implied.
  19  */
  20 #include <linux/clk.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/i2c.h>
  23
  24 #include <asm/hardware.h>
  25 #include <asm/io.h>
  26 #include <asm/mach-types.h>
  27
  28 #include <asm/arch/platform.h>
  29 #include <asm/arch/irqs.h>
  30 #include <asm/arch/gpio.h>
  31
  32 #define USB_CTRL        IO_ADDRESS(PNX4008_PWRMAN_BASE + 0x64)
  33
  34 /* USB_CTRL bit defines */
  35 #define USB_SLAVE_HCLK_EN       (1 << 24)
  36 #define USB_HOST_NEED_CLK_EN    (1 << 21)
  37
  38 #define USB_OTG_CLK_CTRL        IO_ADDRESS(PNX4008_USB_CONFIG_BASE + 0xFF4)
  39 #define USB_OTG_CLK_STAT        IO_ADDRESS(PNX4008_USB_CONFIG_BASE + 0xFF8)
  40
  41 /* USB_OTG_CLK_CTRL bit defines */
  42 #define AHB_M_CLOCK_ON          (1 << 4)
  43 #define OTG_CLOCK_ON            (1 << 3)
  44 #define I2C_CLOCK_ON            (1 << 2)
  45 #define DEV_CLOCK_ON            (1 << 1)
  46 #define HOST_CLOCK_ON           (1 << 0)
  47
  48 #define USB_OTG_STAT_CONTROL    IO_ADDRESS(PNX4008_USB_CONFIG_BASE + 0x110)
  49
  50 /* USB_OTG_STAT_CONTROL bit defines */
  51 #define TRANSPARENT_I2C_EN      (1 << 7)
  52 #define HOST_EN                 (1 << 0)
  53
  54 /* ISP1301 USB transceiver I2C registers */
  55 #define ISP1301_MODE_CONTROL_1          0x04    /* u8 read, set, +1 clear */
  56
  57 #define MC1_SPEED_REG           (1 << 0)
  58 #define MC1_SUSPEND_REG         (1 << 1)
  59 #define MC1_DAT_SE0             (1 << 2)
  60 #define MC1_TRANSPARENT         (1 << 3)
  61 #define MC1_BDIS_ACON_EN        (1 << 4)
  62 #define MC1_OE_INT_EN           (1 << 5)
  63 #define MC1_UART_EN             (1 << 6)
  64 #define MC1_MASK                0x7f
  65
  66 #define ISP1301_MODE_CONTROL_2          0x12    /* u8 read, set, +1 clear */
  67
  68 #define MC2_GLOBAL_PWR_DN       (1 << 0)
  69 #define MC2_SPD_SUSP_CTRL       (1 << 1)
  70 #define MC2_BI_DI               (1 << 2)
  71 #define MC2_TRANSP_BDIR0        (1 << 3)
  72 #define MC2_TRANSP_BDIR1        (1 << 4)
  73 #define MC2_AUDIO_EN            (1 << 5)
  74 #define MC2_PSW_EN              (1 << 6)
  75 #define MC2_EN2V7               (1 << 7)
  76
  77 #define ISP1301_OTG_CONTROL_1           0x06    /* u8 read, set, +1 clear */
  78 #       define  OTG1_DP_PULLUP          (1 << 0)
  79 #       define  OTG1_DM_PULLUP          (1 << 1)
  80 #       define  OTG1_DP_PULLDOWN        (1 << 2)
  81 #       define  OTG1_DM_PULLDOWN        (1 << 3)
  82 #       define  OTG1_ID_PULLDOWN        (1 << 4)
  83 #       define  OTG1_VBUS_DRV           (1 << 5)
  84 #       define  OTG1_VBUS_DISCHRG       (1 << 6)
  85 #       define  OTG1_VBUS_CHRG          (1 << 7)
  86 #define ISP1301_OTG_STATUS              0x10    /* u8 readonly */
  87 #       define  OTG_B_SESS_END          (1 << 6)
  88 #       define  OTG_B_SESS_VLD          (1 << 7)
  89
  90 #define ISP1301_I2C_ADDR 0x2C
  91
  92 #define ISP1301_I2C_MODE_CONTROL_1 0x4
  93 #define ISP1301_I2C_MODE_CONTROL_2 0x12
  94 #define ISP1301_I2C_OTG_CONTROL_1 0x6
  95 #define ISP1301_I2C_OTG_CONTROL_2 0x10
  96 #define ISP1301_I2C_INTERRUPT_SOURCE 0x8
  97 #define ISP1301_I2C_INTERRUPT_LATCH 0xA
  98 #define ISP1301_I2C_INTERRUPT_FALLING 0xC
  99 #define ISP1301_I2C_INTERRUPT_RISING 0xE
 100 #define ISP1301_I2C_REG_CLEAR_ADDR 1
 101
 102 struct i2c_driver isp1301_driver;
 103 struct i2c_client *isp1301_i2c_client;
 104
 105 extern int usb_disabled(void);
 106 extern int ocpi_enable(void);
 107
 108 static struct clk *usb_clk;
 109
 110 static int isp1301_probe(struct i2c_adapter *adap);
 111 static int isp1301_detach(struct i2c_client *client);
 112 static int isp1301_command(struct i2c_client *client, unsigned int cmd,
 113                            void *arg);
 114
 115 static unsigned short normal_i2c[] =
 116     { ISP1301_I2C_ADDR, ISP1301_I2C_ADDR + 1, I2C_CLIENT_END };
 117 static unsigned short dummy_i2c_addrlist[] = { I2C_CLIENT_END };
 118
 119 static struct i2c_client_address_data addr_data = {
 120         .normal_i2c = normal_i2c,
 121         .probe = dummy_i2c_addrlist,
 122         .ignore = dummy_i2c_addrlist,
 123 };
 124
 125 struct i2c_driver isp1301_driver = {
 126         .id = I2C_DRIVERID_I2CDEV,      /* Fake Id */
 127         .class = I2C_CLASS_HWMON,
 128         .attach_adapter = isp1301_probe,
 129         .detach_client = isp1301_detach,
 130         .command = isp1301_command
 131 };
 132
 133 static int isp1301_attach(struct i2c_adapter *adap, int addr, int kind)
 134 {
 135         struct i2c_client *c;
 136
 137         c = (struct i2c_client *)kzalloc(sizeof(*c), GFP_KERNEL);
 138
 139         if (!c)
 140                 return -ENOMEM;
 141
 142         strcpy(c->name, "isp1301");
 143         c->flags = 0;
 144         c->addr = addr;
 145         c->adapter = adap;
 146         c->driver = &isp1301_driver;
 147
 148         isp1301_i2c_client = c;
 149
 150         return i2c_attach_client(c);
 151 }
 152
 153 static int isp1301_probe(struct i2c_adapter *adap)
 154 {
 155         return i2c_probe(adap, &addr_data, isp1301_attach);
 156 }
 157
 158 static int isp1301_detach(struct i2c_client *client)
 159 {
 160         i2c_detach_client(client);
 161         kfree(isp1301_i2c_client);
 162         return 0;
 163 }
 164
 165 /* No commands defined */
 166 static int isp1301_command(struct i2c_client *client, unsigned int cmd,
 167                            void *arg)
 168 {
 169         return 0;
 170 }
 171
 172 static void i2c_write(u8 buf, u8 subaddr)
 173 {
 174         char tmpbuf[2];
 175
 176         tmpbuf[0] = subaddr;    /*register number */
 177         tmpbuf[1] = buf;        /*register data */
 178         i2c_master_send(isp1301_i2c_client, &tmpbuf[0], 2);
 179 }
 180
 181 static void isp1301_configure(void)
 182 {
 183         /* PNX4008 only supports DAT_SE0 USB mode */
 184         /* PNX4008 R2A requires setting the MAX603 to output 3.6V */
 185         /* Power up externel charge-pump */
 186
 187         i2c_write(MC1_DAT_SE0 | MC1_SPEED_REG, ISP1301_I2C_MODE_CONTROL_1);
 188         i2c_write(~(MC1_DAT_SE0 | MC1_SPEED_REG),
 189                   ISP1301_I2C_MODE_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR);
 190         i2c_write(MC2_BI_DI | MC2_PSW_EN | MC2_SPD_SUSP_CTRL,
 191                   ISP1301_I2C_MODE_CONTROL_2);
 192         i2c_write(~(MC2_BI_DI | MC2_PSW_EN | MC2_SPD_SUSP_CTRL),
 193                   ISP1301_I2C_MODE_CONTROL_2 | ISP1301_I2C_REG_CLEAR_ADDR);
 194         i2c_write(OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN,
 195                   ISP1301_I2C_OTG_CONTROL_1);
 196         i2c_write(~(OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN),
 197                   ISP1301_I2C_OTG_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR);
 198         i2c_write(0xFF,
 199                   ISP1301_I2C_INTERRUPT_LATCH | ISP1301_I2C_REG_CLEAR_ADDR);
 200         i2c_write(0xFF,
 201                   ISP1301_I2C_INTERRUPT_FALLING | ISP1301_I2C_REG_CLEAR_ADDR);
 202         i2c_write(0xFF,
 203                   ISP1301_I2C_INTERRUPT_RISING | ISP1301_I2C_REG_CLEAR_ADDR);
 204
 205 }
 206
 207 static inline void isp1301_vbus_on(void)
 208 {
 209         i2c_write(OTG1_VBUS_DRV, ISP1301_I2C_OTG_CONTROL_1);
 210 }
 211
 212 static inline void isp1301_vbus_off(void)
 213 {
 214         i2c_write(OTG1_VBUS_DRV,
 215                   ISP1301_I2C_OTG_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR);
 216 }
 217
 218 static void pnx4008_start_hc(void)
 219 {
 220         unsigned long tmp = __raw_readl(USB_OTG_STAT_CONTROL) | HOST_EN;
 221         __raw_writel(tmp, USB_OTG_STAT_CONTROL);
 222         isp1301_vbus_on();
 223 }
 224
 225 static void pnx4008_stop_hc(void)
 226 {
 227         unsigned long tmp;
 228         isp1301_vbus_off();
 229         tmp = __raw_readl(USB_OTG_STAT_CONTROL) & ~HOST_EN;
 230         __raw_writel(tmp, USB_OTG_STAT_CONTROL);
 231 }
 232
 233 static int __devinit ohci_pnx4008_start(struct usb_hcd *hcd)
 234 {
 235         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 236         int ret;
 237
 238         if ((ret = ohci_init(ohci)) < 0)
 239                 return ret;
 240
 241         if ((ret = ohci_run(ohci)) < 0) {
 242                 dev_err(hcd->self.controller, "can't start\n");
 243                 ohci_stop(hcd);
 244                 return ret;
 245         }
 246         return 0;
 247 }
 248
 249 static const struct hc_driver ohci_pnx4008_hc_driver = {
 250         .description = hcd_name,
 251         .product_desc =         "pnx4008 OHCI",
 252
 253         /*
 254          * generic hardware linkage
 255          */
 256         .irq = ohci_irq,
 257         .flags = HCD_USB11 | HCD_MEMORY,
 258
 259         .hcd_priv_size =        sizeof(struct ohci_hcd),
 260         /*
 261          * basic lifecycle operations
 262          */
 263         .start = ohci_pnx4008_start,
 264         .stop = ohci_stop,
 265         .shutdown = ohci_shutdown,
 266
 267         /*
 268          * managing i/o requests and associated device resources
 269          */
 270         .urb_enqueue = ohci_urb_enqueue,
 271         .urb_dequeue = ohci_urb_dequeue,
 272         .endpoint_disable = ohci_endpoint_disable,
 273
 274         /*
 275          * scheduling support
 276          */
 277         .get_frame_number = ohci_get_frame,
 278
 279         /*
 280          * root hub support
 281          */
 282         .hub_status_data = ohci_hub_status_data,
 283         .hub_control = ohci_hub_control,
 284         .hub_irq_enable = ohci_rhsc_enable,
 285 #ifdef  CONFIG_PM
 286         .bus_suspend = ohci_bus_suspend,
 287         .bus_resume = ohci_bus_resume,
 288 #endif
 289         .start_port_reset = ohci_start_port_reset,
 290 };
 291
 292 #define USB_CLOCK_MASK (AHB_M_CLOCK_ON| OTG_CLOCK_ON | HOST_CLOCK_ON | I2C_CLOCK_ON)
 293
 294 static void pnx4008_set_usb_bits(void)
 295 {
 296         start_int_set_falling_edge(SE_USB_OTG_ATX_INT_N);
 297         start_int_ack(SE_USB_OTG_ATX_INT_N);
 298         start_int_umask(SE_USB_OTG_ATX_INT_N);
 299
 300         start_int_set_rising_edge(SE_USB_OTG_TIMER_INT);
 301         start_int_ack(SE_USB_OTG_TIMER_INT);
 302         start_int_umask(SE_USB_OTG_TIMER_INT);
 303
 304         start_int_set_rising_edge(SE_USB_I2C_INT);
 305         start_int_ack(SE_USB_I2C_INT);
 306         start_int_umask(SE_USB_I2C_INT);
 307
 308         start_int_set_rising_edge(SE_USB_INT);
 309         start_int_ack(SE_USB_INT);
 310         start_int_umask(SE_USB_INT);
 311
 312         start_int_set_rising_edge(SE_USB_NEED_CLK_INT);
 313         start_int_ack(SE_USB_NEED_CLK_INT);
 314         start_int_umask(SE_USB_NEED_CLK_INT);
 315
 316         start_int_set_rising_edge(SE_USB_AHB_NEED_CLK_INT);
 317         start_int_ack(SE_USB_AHB_NEED_CLK_INT);
 318         start_int_umask(SE_USB_AHB_NEED_CLK_INT);
 319 }
 320
 321 static void pnx4008_unset_usb_bits(void)
 322 {
 323         start_int_mask(SE_USB_OTG_ATX_INT_N);
 324         start_int_mask(SE_USB_OTG_TIMER_INT);
 325         start_int_mask(SE_USB_I2C_INT);
 326         start_int_mask(SE_USB_INT);
 327         start_int_mask(SE_USB_NEED_CLK_INT);
 328         start_int_mask(SE_USB_AHB_NEED_CLK_INT);
 329 }
 330
 331 static int __devinit usb_hcd_pnx4008_probe(struct platform_device *pdev)
 332 {
 333         struct usb_hcd *hcd = 0;
 334         struct ohci_hcd *ohci;
 335         const struct hc_driver *driver = &ohci_pnx4008_hc_driver;
 336
 337         int ret = 0, irq;
 338
 339         dev_dbg(&pdev->dev, "%s: " DRIVER_INFO " (pnx4008)\n", hcd_name);
 340         if (usb_disabled()) {
 341                 err("USB is disabled");
 342                 ret = -ENODEV;
 343                 goto out;
 344         }
 345
 346         if (pdev->num_resources != 2
 347             || pdev->resource[0].flags != IORESOURCE_MEM
 348             || pdev->resource[1].flags != IORESOURCE_IRQ) {
 349                 err("Invalid resource configuration");
 350                 ret = -ENODEV;
 351                 goto out;
 352         }
 353
 354         /* Enable AHB slave USB clock, needed for further USB clock control */
 355         __raw_writel(USB_SLAVE_HCLK_EN | (1 << 19), USB_CTRL);
 356
 357         ret = i2c_add_driver(&isp1301_driver);
 358         if (ret < 0) {
 359                 err("failed to connect I2C to ISP1301 USB Transceiver");
 360                 goto out;
 361         }
 362
 363         isp1301_configure();
 364
 365         /* Enable USB PLL */
 366         usb_clk = clk_get(&pdev->dev, "ck_pll5");
 367         if (IS_ERR(usb_clk)) {
 368                 err("failed to acquire USB PLL");
 369                 ret = PTR_ERR(usb_clk);
 370                 goto out1;
 371         }
 372
 373         ret = clk_enable(usb_clk);
 374         if (ret < 0) {
 375                 err("failed to start USB PLL");
 376                 goto out2;
 377         }
 378
 379         ret = clk_set_rate(usb_clk, 48000);
 380         if (ret < 0) {
 381                 err("failed to set USB clock rate");
 382                 goto out3;
 383         }
 384
 385         __raw_writel(__raw_readl(USB_CTRL) | USB_HOST_NEED_CLK_EN, USB_CTRL);
 386
 387         /* Set to enable all needed USB clocks */
 388         __raw_writel(USB_CLOCK_MASK, USB_OTG_CLK_CTRL);
 389
 390         while ((__raw_readl(USB_OTG_CLK_STAT) & USB_CLOCK_MASK) !=
 391                USB_CLOCK_MASK) ;
 392
 393         hcd = usb_create_hcd (driver, &pdev->dev, pdev->dev.bus_id);
 394         if (!hcd) {
 395                 err("Failed to allocate HC buffer");
 396                 ret = -ENOMEM;
 397                 goto out3;
 398         }
 399
 400         /* Set all USB bits in the Start Enable register */
 401         pnx4008_set_usb_bits();
 402
 403         hcd->rsrc_start = pdev->resource[0].start;
 404         hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1;
 405         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 406                 dev_dbg(&pdev->dev, "request_mem_region failed\n");
 407                 ret =  -ENOMEM;
 408                 goto out4;
 409         }
 410         hcd->regs = (void __iomem *)pdev->resource[0].start;
 411
 412         irq = platform_get_irq(pdev, 0);
 413         if (irq < 0) {
 414                 ret = -ENXIO;
 415                 goto out4;
 416         }
 417
 418         pnx4008_start_hc();
 419         platform_set_drvdata(pdev, hcd);
 420         ohci = hcd_to_ohci(hcd);
 421         ohci_hcd_init(ohci);
 422
 423         dev_info(&pdev->dev, "at 0x%p, irq %d\n", hcd->regs, hcd->irq);
 424         ret = usb_add_hcd(hcd, irq, SA_INTERRUPT);
 425         if (ret == 0)
 426                 return ret;
 427
 428         pnx4008_stop_hc();
 429 out4:
 430         pnx4008_unset_usb_bits();
 431         usb_put_hcd(hcd);
 432 out3:
 433         clk_disable(usb_clk);
 434 out2:
 435         clk_put(usb_clk);
 436 out1:
 437         i2c_del_driver(&isp1301_driver);
 438 out:
 439         return ret;
 440 }
 441
 442 static int usb_hcd_pnx4008_remove(struct platform_device *pdev)
 443 {
 444         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 445
 446         usb_remove_hcd(hcd);
 447         pnx4008_stop_hc();
 448         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 449         usb_put_hcd(hcd);
 450         pnx4008_unset_usb_bits();
 451         clk_disable(usb_clk);
 452         clk_put(usb_clk);
 453         i2c_del_driver(&isp1301_driver);
 454
 455         platform_set_drvdata(pdev, NULL);
 456
 457         return 0;
 458 }
 459
 460 static struct platform_driver usb_hcd_pnx4008_driver = {
 461         .driver = {
 462                 .name = "usb-ohci",
 463         },
 464         .probe = usb_hcd_pnx4008_probe,
 465         .remove = usb_hcd_pnx4008_remove,
 466 };
 467
 468 static int __init usb_hcd_pnx4008_init(void)
 469 {
 470         return platform_driver_register(&usb_hcd_pnx4008_driver);
 471 }
 472
 473 static void __exit usb_hcd_pnx4008_cleanup(void)
 474 {
 475         return platform_driver_unregister(&usb_hcd_pnx4008_driver);
 476 }
 477
 478 module_init(usb_hcd_pnx4008_init);
 479 module_exit(usb_hcd_pnx4008_cleanup);