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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 <mach/hardware.h>
  25 #include <asm/io.h>
  26
  27 #include <mach/platform.h>
  28 #include <mach/irqs.h>
  29 #include <mach/gpio.h>
  30
  31 #define USB_CTRL        IO_ADDRESS(PNX4008_PWRMAN_BASE + 0x64)
  32
  33 /* USB_CTRL bit defines */
  34 #define USB_SLAVE_HCLK_EN       (1 << 24)
  35 #define USB_HOST_NEED_CLK_EN    (1 << 21)
  36
  37 #define USB_OTG_CLK_CTRL        IO_ADDRESS(PNX4008_USB_CONFIG_BASE + 0xFF4)
  38 #define USB_OTG_CLK_STAT        IO_ADDRESS(PNX4008_USB_CONFIG_BASE + 0xFF8)
  39
  40 /* USB_OTG_CLK_CTRL bit defines */
  41 #define AHB_M_CLOCK_ON          (1 << 4)
  42 #define OTG_CLOCK_ON            (1 << 3)
  43 #define I2C_CLOCK_ON            (1 << 2)
  44 #define DEV_CLOCK_ON            (1 << 1)
  45 #define HOST_CLOCK_ON           (1 << 0)
  46
  47 #define USB_OTG_STAT_CONTROL    IO_ADDRESS(PNX4008_USB_CONFIG_BASE + 0x110)
  48
  49 /* USB_OTG_STAT_CONTROL bit defines */
  50 #define TRANSPARENT_I2C_EN      (1 << 7)
  51 #define HOST_EN                 (1 << 0)
  52
  53 /* ISP1301 USB transceiver I2C registers */
  54 #define ISP1301_MODE_CONTROL_1          0x04    /* u8 read, set, +1 clear */
  55
  56 #define MC1_SPEED_REG           (1 << 0)
  57 #define MC1_SUSPEND_REG         (1 << 1)
  58 #define MC1_DAT_SE0             (1 << 2)
  59 #define MC1_TRANSPARENT         (1 << 3)
  60 #define MC1_BDIS_ACON_EN        (1 << 4)
  61 #define MC1_OE_INT_EN           (1 << 5)
  62 #define MC1_UART_EN             (1 << 6)
  63 #define MC1_MASK                0x7f
  64
  65 #define ISP1301_MODE_CONTROL_2          0x12    /* u8 read, set, +1 clear */
  66
  67 #define MC2_GLOBAL_PWR_DN       (1 << 0)
  68 #define MC2_SPD_SUSP_CTRL       (1 << 1)
  69 #define MC2_BI_DI               (1 << 2)
  70 #define MC2_TRANSP_BDIR0        (1 << 3)
  71 #define MC2_TRANSP_BDIR1        (1 << 4)
  72 #define MC2_AUDIO_EN            (1 << 5)
  73 #define MC2_PSW_EN              (1 << 6)
  74 #define MC2_EN2V7               (1 << 7)
  75
  76 #define ISP1301_OTG_CONTROL_1           0x06    /* u8 read, set, +1 clear */
  77 #       define  OTG1_DP_PULLUP          (1 << 0)
  78 #       define  OTG1_DM_PULLUP          (1 << 1)
  79 #       define  OTG1_DP_PULLDOWN        (1 << 2)
  80 #       define  OTG1_DM_PULLDOWN        (1 << 3)
  81 #       define  OTG1_ID_PULLDOWN        (1 << 4)
  82 #       define  OTG1_VBUS_DRV           (1 << 5)
  83 #       define  OTG1_VBUS_DISCHRG       (1 << 6)
  84 #       define  OTG1_VBUS_CHRG          (1 << 7)
  85 #define ISP1301_OTG_STATUS              0x10    /* u8 readonly */
  86 #       define  OTG_B_SESS_END          (1 << 6)
  87 #       define  OTG_B_SESS_VLD          (1 << 7)
  88
  89 #define ISP1301_I2C_ADDR 0x2C
  90
  91 #define ISP1301_I2C_MODE_CONTROL_1 0x4
  92 #define ISP1301_I2C_MODE_CONTROL_2 0x12
  93 #define ISP1301_I2C_OTG_CONTROL_1 0x6
  94 #define ISP1301_I2C_OTG_CONTROL_2 0x10
  95 #define ISP1301_I2C_INTERRUPT_SOURCE 0x8
  96 #define ISP1301_I2C_INTERRUPT_LATCH 0xA
  97 #define ISP1301_I2C_INTERRUPT_FALLING 0xC
  98 #define ISP1301_I2C_INTERRUPT_RISING 0xE
  99 #define ISP1301_I2C_REG_CLEAR_ADDR 1
 100
 101 struct i2c_driver isp1301_driver;
 102 struct i2c_client *isp1301_i2c_client;
 103
 104 extern int usb_disabled(void);
 105 extern int ocpi_enable(void);
 106
 107 static struct clk *usb_clk;
 108
 109 static int isp1301_probe(struct i2c_adapter *adap);
 110 static int isp1301_detach(struct i2c_client *client);
 111
 112 static const unsigned short normal_i2c[] =
 113     { ISP1301_I2C_ADDR, ISP1301_I2C_ADDR + 1, I2C_CLIENT_END };
 114 static const unsigned short dummy_i2c_addrlist[] = { I2C_CLIENT_END };
 115
 116 static struct i2c_client_address_data addr_data = {
 117         .normal_i2c = normal_i2c,
 118         .probe = dummy_i2c_addrlist,
 119         .ignore = dummy_i2c_addrlist,
 120 };
 121
 122 struct i2c_driver isp1301_driver = {
 123         .driver = {
 124                 .name = "isp1301_pnx",
 125         },
 126         .attach_adapter = isp1301_probe,
 127         .detach_client = isp1301_detach,
 128 };
 129
 130 static int isp1301_attach(struct i2c_adapter *adap, int addr, int kind)
 131 {
 132         struct i2c_client *c;
 133         int err;
 134
 135         c = kzalloc(sizeof(*c), GFP_KERNEL);
 136         if (!c)
 137                 return -ENOMEM;
 138
 139         strlcpy(c->name, "isp1301_pnx", I2C_NAME_SIZE);
 140         c->flags = 0;
 141         c->addr = addr;
 142         c->adapter = adap;
 143         c->driver = &isp1301_driver;
 144
 145         err = i2c_attach_client(c);
 146         if (err) {
 147                 kfree(c);
 148                 return err;
 149         }
 150
 151         isp1301_i2c_client = c;
 152
 153         return 0;
 154 }
 155
 156 static int isp1301_probe(struct i2c_adapter *adap)
 157 {
 158         return i2c_probe(adap, &addr_data, isp1301_attach);
 159 }
 160
 161 static int isp1301_detach(struct i2c_client *client)
 162 {
 163         i2c_detach_client(client);
 164         kfree(isp1301_i2c_client);
 165         return 0;
 166 }
 167
 168 static void i2c_write(u8 buf, u8 subaddr)
 169 {
 170         char tmpbuf[2];
 171
 172         tmpbuf[0] = subaddr;    /*register number */
 173         tmpbuf[1] = buf;        /*register data */
 174         i2c_master_send(isp1301_i2c_client, &tmpbuf[0], 2);
 175 }
 176
 177 static void isp1301_configure(void)
 178 {
 179         /* PNX4008 only supports DAT_SE0 USB mode */
 180         /* PNX4008 R2A requires setting the MAX603 to output 3.6V */
 181         /* Power up externel charge-pump */
 182
 183         i2c_write(MC1_DAT_SE0 | MC1_SPEED_REG, ISP1301_I2C_MODE_CONTROL_1);
 184         i2c_write(~(MC1_DAT_SE0 | MC1_SPEED_REG),
 185                   ISP1301_I2C_MODE_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR);
 186         i2c_write(MC2_BI_DI | MC2_PSW_EN | MC2_SPD_SUSP_CTRL,
 187                   ISP1301_I2C_MODE_CONTROL_2);
 188         i2c_write(~(MC2_BI_DI | MC2_PSW_EN | MC2_SPD_SUSP_CTRL),
 189                   ISP1301_I2C_MODE_CONTROL_2 | ISP1301_I2C_REG_CLEAR_ADDR);
 190         i2c_write(OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN,
 191                   ISP1301_I2C_OTG_CONTROL_1);
 192         i2c_write(~(OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN),
 193                   ISP1301_I2C_OTG_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR);
 194         i2c_write(0xFF,
 195                   ISP1301_I2C_INTERRUPT_LATCH | ISP1301_I2C_REG_CLEAR_ADDR);
 196         i2c_write(0xFF,
 197                   ISP1301_I2C_INTERRUPT_FALLING | ISP1301_I2C_REG_CLEAR_ADDR);
 198         i2c_write(0xFF,
 199                   ISP1301_I2C_INTERRUPT_RISING | ISP1301_I2C_REG_CLEAR_ADDR);
 200
 201 }
 202
 203 static inline void isp1301_vbus_on(void)
 204 {
 205         i2c_write(OTG1_VBUS_DRV, ISP1301_I2C_OTG_CONTROL_1);
 206 }
 207
 208 static inline void isp1301_vbus_off(void)
 209 {
 210         i2c_write(OTG1_VBUS_DRV,
 211                   ISP1301_I2C_OTG_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR);
 212 }
 213
 214 static void pnx4008_start_hc(void)
 215 {
 216         unsigned long tmp = __raw_readl(USB_OTG_STAT_CONTROL) | HOST_EN;
 217         __raw_writel(tmp, USB_OTG_STAT_CONTROL);
 218         isp1301_vbus_on();
 219 }
 220
 221 static void pnx4008_stop_hc(void)
 222 {
 223         unsigned long tmp;
 224         isp1301_vbus_off();
 225         tmp = __raw_readl(USB_OTG_STAT_CONTROL) & ~HOST_EN;
 226         __raw_writel(tmp, USB_OTG_STAT_CONTROL);
 227 }
 228
 229 static int __devinit ohci_pnx4008_start(struct usb_hcd *hcd)
 230 {
 231         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 232         int ret;
 233
 234         if ((ret = ohci_init(ohci)) < 0)
 235                 return ret;
 236
 237         if ((ret = ohci_run(ohci)) < 0) {
 238                 dev_err(hcd->self.controller, "can't start\n");
 239                 ohci_stop(hcd);
 240                 return ret;
 241         }
 242         return 0;
 243 }
 244
 245 static const struct hc_driver ohci_pnx4008_hc_driver = {
 246         .description = hcd_name,
 247         .product_desc =         "pnx4008 OHCI",
 248
 249         /*
 250          * generic hardware linkage
 251          */
 252         .irq = ohci_irq,
 253         .flags = HCD_USB11 | HCD_MEMORY,
 254
 255         .hcd_priv_size =        sizeof(struct ohci_hcd),
 256         /*
 257          * basic lifecycle operations
 258          */
 259         .start = ohci_pnx4008_start,
 260         .stop = ohci_stop,
 261         .shutdown = ohci_shutdown,
 262
 263         /*
 264          * managing i/o requests and associated device resources
 265          */
 266         .urb_enqueue = ohci_urb_enqueue,
 267         .urb_dequeue = ohci_urb_dequeue,
 268         .endpoint_disable = ohci_endpoint_disable,
 269
 270         /*
 271          * scheduling support
 272          */
 273         .get_frame_number = ohci_get_frame,
 274
 275         /*
 276          * root hub support
 277          */
 278         .hub_status_data = ohci_hub_status_data,
 279         .hub_control = ohci_hub_control,
 280 #ifdef  CONFIG_PM
 281         .bus_suspend = ohci_bus_suspend,
 282         .bus_resume = ohci_bus_resume,
 283 #endif
 284         .start_port_reset = ohci_start_port_reset,
 285 };
 286
 287 #define USB_CLOCK_MASK (AHB_M_CLOCK_ON| OTG_CLOCK_ON | HOST_CLOCK_ON | I2C_CLOCK_ON)
 288
 289 static void pnx4008_set_usb_bits(void)
 290 {
 291         start_int_set_falling_edge(SE_USB_OTG_ATX_INT_N);
 292         start_int_ack(SE_USB_OTG_ATX_INT_N);
 293         start_int_umask(SE_USB_OTG_ATX_INT_N);
 294
 295         start_int_set_rising_edge(SE_USB_OTG_TIMER_INT);
 296         start_int_ack(SE_USB_OTG_TIMER_INT);
 297         start_int_umask(SE_USB_OTG_TIMER_INT);
 298
 299         start_int_set_rising_edge(SE_USB_I2C_INT);
 300         start_int_ack(SE_USB_I2C_INT);
 301         start_int_umask(SE_USB_I2C_INT);
 302
 303         start_int_set_rising_edge(SE_USB_INT);
 304         start_int_ack(SE_USB_INT);
 305         start_int_umask(SE_USB_INT);
 306
 307         start_int_set_rising_edge(SE_USB_NEED_CLK_INT);
 308         start_int_ack(SE_USB_NEED_CLK_INT);
 309         start_int_umask(SE_USB_NEED_CLK_INT);
 310
 311         start_int_set_rising_edge(SE_USB_AHB_NEED_CLK_INT);
 312         start_int_ack(SE_USB_AHB_NEED_CLK_INT);
 313         start_int_umask(SE_USB_AHB_NEED_CLK_INT);
 314 }
 315
 316 static void pnx4008_unset_usb_bits(void)
 317 {
 318         start_int_mask(SE_USB_OTG_ATX_INT_N);
 319         start_int_mask(SE_USB_OTG_TIMER_INT);
 320         start_int_mask(SE_USB_I2C_INT);
 321         start_int_mask(SE_USB_INT);
 322         start_int_mask(SE_USB_NEED_CLK_INT);
 323         start_int_mask(SE_USB_AHB_NEED_CLK_INT);
 324 }
 325
 326 static int __devinit usb_hcd_pnx4008_probe(struct platform_device *pdev)
 327 {
 328         struct usb_hcd *hcd = 0;
 329         struct ohci_hcd *ohci;
 330         const struct hc_driver *driver = &ohci_pnx4008_hc_driver;
 331
 332         int ret = 0, irq;
 333
 334         dev_dbg(&pdev->dev, "%s: " DRIVER_DESC " (pnx4008)\n", hcd_name);
 335         if (usb_disabled()) {
 336                 err("USB is disabled");
 337                 ret = -ENODEV;
 338                 goto out;
 339         }
 340
 341         if (pdev->num_resources != 2
 342             || pdev->resource[0].flags != IORESOURCE_MEM
 343             || pdev->resource[1].flags != IORESOURCE_IRQ) {
 344                 err("Invalid resource configuration");
 345                 ret = -ENODEV;
 346                 goto out;
 347         }
 348
 349         /* Enable AHB slave USB clock, needed for further USB clock control */
 350         __raw_writel(USB_SLAVE_HCLK_EN | (1 << 19), USB_CTRL);
 351
 352         ret = i2c_add_driver(&isp1301_driver);
 353         if (ret < 0) {
 354                 err("failed to connect I2C to ISP1301 USB Transceiver");
 355                 goto out;
 356         }
 357
 358         isp1301_configure();
 359
 360         /* Enable USB PLL */
 361         usb_clk = clk_get(&pdev->dev, "ck_pll5");
 362         if (IS_ERR(usb_clk)) {
 363                 err("failed to acquire USB PLL");
 364                 ret = PTR_ERR(usb_clk);
 365                 goto out1;
 366         }
 367
 368         ret = clk_enable(usb_clk);
 369         if (ret < 0) {
 370                 err("failed to start USB PLL");
 371                 goto out2;
 372         }
 373
 374         ret = clk_set_rate(usb_clk, 48000);
 375         if (ret < 0) {
 376                 err("failed to set USB clock rate");
 377                 goto out3;
 378         }
 379
 380         __raw_writel(__raw_readl(USB_CTRL) | USB_HOST_NEED_CLK_EN, USB_CTRL);
 381
 382         /* Set to enable all needed USB clocks */
 383         __raw_writel(USB_CLOCK_MASK, USB_OTG_CLK_CTRL);
 384
 385         while ((__raw_readl(USB_OTG_CLK_STAT) & USB_CLOCK_MASK) !=
 386                USB_CLOCK_MASK) ;
 387
 388         hcd = usb_create_hcd (driver, &pdev->dev, dev_name(&pdev->dev));
 389         if (!hcd) {
 390                 err("Failed to allocate HC buffer");
 391                 ret = -ENOMEM;
 392                 goto out3;
 393         }
 394
 395         /* Set all USB bits in the Start Enable register */
 396         pnx4008_set_usb_bits();
 397
 398         hcd->rsrc_start = pdev->resource[0].start;
 399         hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1;
 400         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 401                 dev_dbg(&pdev->dev, "request_mem_region failed\n");
 402                 ret =  -ENOMEM;
 403                 goto out4;
 404         }
 405         hcd->regs = (void __iomem *)pdev->resource[0].start;
 406
 407         irq = platform_get_irq(pdev, 0);
 408         if (irq < 0) {
 409                 ret = -ENXIO;
 410                 goto out4;
 411         }
 412
 413         pnx4008_start_hc();
 414         platform_set_drvdata(pdev, hcd);
 415         ohci = hcd_to_ohci(hcd);
 416         ohci_hcd_init(ohci);
 417
 418         dev_info(&pdev->dev, "at 0x%p, irq %d\n", hcd->regs, hcd->irq);
 419         ret = usb_add_hcd(hcd, irq, IRQF_DISABLED);
 420         if (ret == 0)
 421                 return ret;
 422
 423         pnx4008_stop_hc();
 424 out4:
 425         pnx4008_unset_usb_bits();
 426         usb_put_hcd(hcd);
 427 out3:
 428         clk_disable(usb_clk);
 429 out2:
 430         clk_put(usb_clk);
 431 out1:
 432         i2c_del_driver(&isp1301_driver);
 433 out:
 434         return ret;
 435 }
 436
 437 static int usb_hcd_pnx4008_remove(struct platform_device *pdev)
 438 {
 439         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 440
 441         usb_remove_hcd(hcd);
 442         pnx4008_stop_hc();
 443         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 444         usb_put_hcd(hcd);
 445         pnx4008_unset_usb_bits();
 446         clk_disable(usb_clk);
 447         clk_put(usb_clk);
 448         i2c_del_driver(&isp1301_driver);
 449
 450         platform_set_drvdata(pdev, NULL);
 451
 452         return 0;
 453 }
 454
 455 /* work with hotplug and coldplug */
 456 MODULE_ALIAS("platform:usb-ohci");
 457
 458 static struct platform_driver usb_hcd_pnx4008_driver = {
 459         .driver = {
 460                 .name = "usb-ohci",
 461                 .owner  = THIS_MODULE,
 462         },
 463         .probe = usb_hcd_pnx4008_probe,
 464         .remove = usb_hcd_pnx4008_remove,
 465 };
 466