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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 const unsigned short normal_i2c[] =
 116     { ISP1301_I2C_ADDR, ISP1301_I2C_ADDR + 1, I2C_CLIENT_END };
 117 static const 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         .class = I2C_CLASS_HWMON,
 127         .attach_adapter = isp1301_probe,
 128         .detach_client = isp1301_detach,
 129         .command = isp1301_command
 130 };
 131
 132 static int isp1301_attach(struct i2c_adapter *adap, int addr, int kind)
 133 {
 134         struct i2c_client *c;
 135
 136         c = kzalloc(sizeof(*c), GFP_KERNEL);
 137
 138         if (!c)
 139                 return -ENOMEM;
 140
 141         strcpy(c->name, "isp1301");
 142         c->flags = 0;
 143         c->addr = addr;
 144         c->adapter = adap;
 145         c->driver = &isp1301_driver;
 146
 147         isp1301_i2c_client = c;
 148
 149         return i2c_attach_client(c);
 150 }
 151
 152 static int isp1301_probe(struct i2c_adapter *adap)
 153 {
 154         return i2c_probe(adap, &addr_data, isp1301_attach);
 155 }
 156
 157 static int isp1301_detach(struct i2c_client *client)
 158 {
 159         i2c_detach_client(client);
 160         kfree(isp1301_i2c_client);
 161         return 0;
 162 }
 163
 164 /* No commands defined */
 165 static int isp1301_command(struct i2c_client *client, unsigned int cmd,
 166                            void *arg)
 167 {
 168         return 0;
 169 }
 170
 171 static void i2c_write(u8 buf, u8 subaddr)
 172 {
 173         char tmpbuf[2];
 174
 175         tmpbuf[0] = subaddr;    /*register number */
 176         tmpbuf[1] = buf;        /*register data */
 177         i2c_master_send(isp1301_i2c_client, &tmpbuf[0], 2);
 178 }
 179
 180 static void isp1301_configure(void)
 181 {
 182         /* PNX4008 only supports DAT_SE0 USB mode */
 183         /* PNX4008 R2A requires setting the MAX603 to output 3.6V */
 184         /* Power up externel charge-pump */
 185
 186         i2c_write(MC1_DAT_SE0 | MC1_SPEED_REG, ISP1301_I2C_MODE_CONTROL_1);
 187         i2c_write(~(MC1_DAT_SE0 | MC1_SPEED_REG),
 188                   ISP1301_I2C_MODE_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR);
 189         i2c_write(MC2_BI_DI | MC2_PSW_EN | MC2_SPD_SUSP_CTRL,
 190                   ISP1301_I2C_MODE_CONTROL_2);
 191         i2c_write(~(MC2_BI_DI | MC2_PSW_EN | MC2_SPD_SUSP_CTRL),
 192                   ISP1301_I2C_MODE_CONTROL_2 | ISP1301_I2C_REG_CLEAR_ADDR);
 193         i2c_write(OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN,
 194                   ISP1301_I2C_OTG_CONTROL_1);
 195         i2c_write(~(OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN),
 196                   ISP1301_I2C_OTG_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR);
 197         i2c_write(0xFF,
 198                   ISP1301_I2C_INTERRUPT_LATCH | ISP1301_I2C_REG_CLEAR_ADDR);
 199         i2c_write(0xFF,
 200                   ISP1301_I2C_INTERRUPT_FALLING | ISP1301_I2C_REG_CLEAR_ADDR);
 201         i2c_write(0xFF,
 202                   ISP1301_I2C_INTERRUPT_RISING | ISP1301_I2C_REG_CLEAR_ADDR);
 203
 204 }
 205
 206 static inline void isp1301_vbus_on(void)
 207 {
 208         i2c_write(OTG1_VBUS_DRV, ISP1301_I2C_OTG_CONTROL_1);
 209 }
 210
 211 static inline void isp1301_vbus_off(void)
 212 {
 213         i2c_write(OTG1_VBUS_DRV,
 214                   ISP1301_I2C_OTG_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR);
 215 }
 216
 217 static void pnx4008_start_hc(void)
 218 {
 219         unsigned long tmp = __raw_readl(USB_OTG_STAT_CONTROL) | HOST_EN;
 220         __raw_writel(tmp, USB_OTG_STAT_CONTROL);
 221         isp1301_vbus_on();
 222 }
 223
 224 static void pnx4008_stop_hc(void)
 225 {
 226         unsigned long tmp;
 227         isp1301_vbus_off();
 228         tmp = __raw_readl(USB_OTG_STAT_CONTROL) & ~HOST_EN;
 229         __raw_writel(tmp, USB_OTG_STAT_CONTROL);
 230 }
 231
 232 static int __devinit ohci_pnx4008_start(struct usb_hcd *hcd)
 233 {
 234         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 235         int ret;
 236
 237         if ((ret = ohci_init(ohci)) < 0)
 238                 return ret;
 239
 240         if ((ret = ohci_run(ohci)) < 0) {
 241                 dev_err(hcd->self.controller, "can't start\n");
 242                 ohci_stop(hcd);
 243                 return ret;
 244         }
 245         return 0;
 246 }
 247
 248 static const struct hc_driver ohci_pnx4008_hc_driver = {
 249         .description = hcd_name,
 250         .product_desc =         "pnx4008 OHCI",
 251
 252         /*
 253          * generic hardware linkage
 254          */
 255         .irq = ohci_irq,
 256         .flags = HCD_USB11 | HCD_MEMORY,
 257
 258         .hcd_priv_size =        sizeof(struct ohci_hcd),
 259         /*
 260          * basic lifecycle operations
 261          */
 262         .start = ohci_pnx4008_start,
 263         .stop = ohci_stop,
 264         .shutdown = ohci_shutdown,
 265
 266         /*
 267          * managing i/o requests and associated device resources
 268          */
 269         .urb_enqueue = ohci_urb_enqueue,
 270         .urb_dequeue = ohci_urb_dequeue,
 271         .endpoint_disable = ohci_endpoint_disable,
 272
 273         /*
 274          * scheduling support
 275          */
 276         .get_frame_number = ohci_get_frame,
 277
 278         /*
 279          * root hub support
 280          */
 281         .hub_status_data = ohci_hub_status_data,
 282         .hub_control = ohci_hub_control,
 283         .hub_irq_enable = ohci_rhsc_enable,
 284 #ifdef  CONFIG_PM
 285         .bus_suspend = ohci_bus_suspend,
 286         .bus_resume = ohci_bus_resume,
 287 #endif
 288         .start_port_reset = ohci_start_port_reset,
 289 };
 290
 291 #define USB_CLOCK_MASK (AHB_M_CLOCK_ON| OTG_CLOCK_ON | HOST_CLOCK_ON | I2C_CLOCK_ON)
 292
 293 static void pnx4008_set_usb_bits(void)
 294 {
 295         start_int_set_falling_edge(SE_USB_OTG_ATX_INT_N);
 296         start_int_ack(SE_USB_OTG_ATX_INT_N);
 297         start_int_umask(SE_USB_OTG_ATX_INT_N);
 298
 299         start_int_set_rising_edge(SE_USB_OTG_TIMER_INT);
 300         start_int_ack(SE_USB_OTG_TIMER_INT);
 301         start_int_umask(SE_USB_OTG_TIMER_INT);
 302
 303         start_int_set_rising_edge(SE_USB_I2C_INT);
 304         start_int_ack(SE_USB_I2C_INT);
 305         start_int_umask(SE_USB_I2C_INT);
 306
 307         start_int_set_rising_edge(SE_USB_INT);
 308         start_int_ack(SE_USB_INT);
 309         start_int_umask(SE_USB_INT);
 310
 311         start_int_set_rising_edge(SE_USB_NEED_CLK_INT);
 312         start_int_ack(SE_USB_NEED_CLK_INT);
 313         start_int_umask(SE_USB_NEED_CLK_INT);
 314
 315         start_int_set_rising_edge(SE_USB_AHB_NEED_CLK_INT);
 316         start_int_ack(SE_USB_AHB_NEED_CLK_INT);
 317         start_int_umask(SE_USB_AHB_NEED_CLK_INT);
 318 }
 319
 320 static void pnx4008_unset_usb_bits(void)
 321 {
 322         start_int_mask(SE_USB_OTG_ATX_INT_N);
 323         start_int_mask(SE_USB_OTG_TIMER_INT);
 324         start_int_mask(SE_USB_I2C_INT);
 325         start_int_mask(SE_USB_INT);
 326         start_int_mask(SE_USB_NEED_CLK_INT);
 327         start_int_mask(SE_USB_AHB_NEED_CLK_INT);
 328 }
 329
 330 static int __devinit usb_hcd_pnx4008_probe(struct platform_device *pdev)
 331 {
 332         struct usb_hcd *hcd = 0;
 333         struct ohci_hcd *ohci;
 334         const struct hc_driver *driver = &ohci_pnx4008_hc_driver;
 335
 336         int ret = 0, irq;
 337
 338         dev_dbg(&pdev->dev, "%s: " DRIVER_INFO " (pnx4008)\n", hcd_name);
 339         if (usb_disabled()) {
 340                 err("USB is disabled");
 341                 ret = -ENODEV;
 342                 goto out;
 343         }
 344
 345         if (pdev->num_resources != 2
 346             || pdev->resource[0].flags != IORESOURCE_MEM
 347             || pdev->resource[1].flags != IORESOURCE_IRQ) {
 348                 err("Invalid resource configuration");
 349                 ret = -ENODEV;
 350                 goto out;
 351         }
 352
 353         /* Enable AHB slave USB clock, needed for further USB clock control */
 354         __raw_writel(USB_SLAVE_HCLK_EN | (1 << 19), USB_CTRL);
 355
 356         ret = i2c_add_driver(&isp1301_driver);
 357         if (ret < 0) {
 358                 err("failed to connect I2C to ISP1301 USB Transceiver");
 359                 goto out;
 360         }
 361
 362         isp1301_configure();
 363
 364         /* Enable USB PLL */
 365         usb_clk = clk_get(&pdev->dev, "ck_pll5");
 366         if (IS_ERR(usb_clk)) {
 367                 err("failed to acquire USB PLL");
 368                 ret = PTR_ERR(usb_clk);
 369                 goto out1;
 370         }
 371
 372         ret = clk_enable(usb_clk);
 373         if (ret < 0) {
 374                 err("failed to start USB PLL");
 375                 goto out2;
 376         }
 377
 378         ret = clk_set_rate(usb_clk, 48000);
 379         if (ret < 0) {
 380                 err("failed to set USB clock rate");
 381                 goto out3;
 382         }
 383
 384         __raw_writel(__raw_readl(USB_CTRL) | USB_HOST_NEED_CLK_EN, USB_CTRL);
 385
 386         /* Set to enable all needed USB clocks */
 387         __raw_writel(USB_CLOCK_MASK, USB_OTG_CLK_CTRL);
 388
 389         while ((__raw_readl(USB_OTG_CLK_STAT) & USB_CLOCK_MASK) !=
 390                USB_CLOCK_MASK) ;
 391
 392         hcd = usb_create_hcd (driver, &pdev->dev, pdev->dev.bus_id);
 393         if (!hcd) {
 394                 err("Failed to allocate HC buffer");
 395                 ret = -ENOMEM;
 396                 goto out3;
 397         }
 398
 399         /* Set all USB bits in the Start Enable register */
 400         pnx4008_set_usb_bits();
 401
 402         hcd->rsrc_start = pdev->resource[0].start;
 403         hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1;
 404         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 405                 dev_dbg(&pdev->dev, "request_mem_region failed\n");
 406                 ret =  -ENOMEM;
 407                 goto out4;
 408         }
 409         hcd->regs = (void __iomem *)pdev->resource[0].start;
 410
 411         irq = platform_get_irq(pdev, 0);
 412         if (irq < 0) {
 413                 ret = -ENXIO;
 414                 goto out4;
 415         }
 416
 417         pnx4008_start_hc();
 418         platform_set_drvdata(pdev, hcd);
 419         ohci = hcd_to_ohci(hcd);
 420         ohci_hcd_init(ohci);
 421
 422         dev_info(&pdev->dev, "at 0x%p, irq %d\n", hcd->regs, hcd->irq);
 423         ret = usb_add_hcd(hcd, irq, IRQF_DISABLED);
 424         if (ret == 0)
 425                 return ret;
 426
 427         pnx4008_stop_hc();
 428 out4:
 429         pnx4008_unset_usb_bits();
 430         usb_put_hcd(hcd);
 431 out3:
 432         clk_disable(usb_clk);
 433 out2:
 434         clk_put(usb_clk);
 435 out1:
 436         i2c_del_driver(&isp1301_driver);
 437 out:
 438         return ret;
 439 }
 440
 441 static int usb_hcd_pnx4008_remove(struct platform_device *pdev)
 442 {
 443         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 444
 445         usb_remove_hcd(hcd);
 446         pnx4008_stop_hc();
 447         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 448         usb_put_hcd(hcd);
 449         pnx4008_unset_usb_bits();
 450         clk_disable(usb_clk);
 451         clk_put(usb_clk);
 452         i2c_del_driver(&isp1301_driver);
 453
 454         platform_set_drvdata(pdev, NULL);
 455
 456         return 0;
 457 }
 458
 459 static struct platform_driver usb_hcd_pnx4008_driver = {
 460         .driver = {
 461                 .name = "usb-ohci",
 462         },
 463         .probe = usb_hcd_pnx4008_probe,
 464         .remove = usb_hcd_pnx4008_remove,
 465 };
 466