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usb.c

/*
 * Platform level USB initialization for FS USB OTG controller on omap1 and 24xx
 *
 * Copyright (C) 2004 Texas Instruments, Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/io.h>

#include <asm/irq.h>

#include <plat/mux.h>
#include <plat/usb.h>

/* These routines should handle the standard chip-specific modes
 * for usb0/1/2 ports, covering basic mux and transceiver setup.
 *
 * Some board-*.c files will need to set up additional mux options,
 * like for suspend handling, vbus sensing, GPIOs, and the D+ pullup.
 */

/* TESTED ON:
 *  - 1611B H2 (with usb1 mini-AB) using standard Mini-B or OTG cables
 *  - 5912 OSK OHCI (with usb0 standard-A), standard A-to-B cables
 *  - 5912 OSK UDC, with *nonstandard* A-to-A cable
 *  - 1510 Innovator UDC with bundled usb0 cable
 *  - 1510 Innovator OHCI with bundled usb1/usb2 cable
 *  - 1510 Innovator OHCI with custom usb0 cable, feeding 5V VBUS
 *  - 1710 custom development board using alternate pin group
 *  - 1710 H3 (with usb1 mini-AB) using standard Mini-B or OTG cables
 */

#define INT_USB_IRQ_GEN       IH2_BASE + 20
#define INT_USB_IRQ_NISO      IH2_BASE + 30
#define INT_USB_IRQ_ISO       IH2_BASE + 29
#define INT_USB_IRQ_HGEN      INT_USB_HHC_1
#define INT_USB_IRQ_OTG       IH2_BASE + 8

#ifdef      CONFIG_USB_GADGET_OMAP

static struct resource udc_resources[] = {
      /* order is significant! */
      {           /* registers */
            .start            = UDC_BASE,
            .end        = UDC_BASE + 0xff,
            .flags            = IORESOURCE_MEM,
      }, {        /* general IRQ */
            .start            = INT_USB_IRQ_GEN,
            .flags            = IORESOURCE_IRQ,
      }, {        /* PIO IRQ */
            .start            = INT_USB_IRQ_NISO,
            .flags            = IORESOURCE_IRQ,
      }, {        /* SOF IRQ */
            .start            = INT_USB_IRQ_ISO,
            .flags            = IORESOURCE_IRQ,
      },
};

static u64 udc_dmamask = ~(u32)0;

static struct platform_device udc_device = {
      .name       = "omap_udc",
      .id         = -1,
      .dev = {
            .dma_mask         = &udc_dmamask,
            .coherent_dma_mask      = 0xffffffff,
      },
      .num_resources    = ARRAY_SIZE(udc_resources),
      .resource   = udc_resources,
};

static inline void udc_device_init(struct omap_usb_config *pdata)
{
      /* IRQ numbers for omap7xx */
      if(cpu_is_omap7xx()) {
            udc_resources[1].start = INT_7XX_USB_GENI;
            udc_resources[2].start = INT_7XX_USB_NON_ISO;
            udc_resources[3].start = INT_7XX_USB_ISO;
      }
      pdata->udc_device = &udc_device;
}

#else

static inline void udc_device_init(struct omap_usb_config *pdata)
{
}

#endif

#if   defined(CONFIG_USB_OHCI_HCD) || defined(CONFIG_USB_OHCI_HCD_MODULE)

/* The dmamask must be set for OHCI to work */
static u64 ohci_dmamask = ~(u32)0;

static struct resource ohci_resources[] = {
      {
            .start      = OMAP_OHCI_BASE,
            .end  = OMAP_OHCI_BASE + 0xff,
            .flags      = IORESOURCE_MEM,
      },
      {
            .start      = INT_USB_IRQ_HGEN,
            .flags      = IORESOURCE_IRQ,
      },
};

static struct platform_device ohci_device = {
      .name             = "ohci",
      .id               = -1,
      .dev = {
            .dma_mask         = &ohci_dmamask,
            .coherent_dma_mask      = 0xffffffff,
      },
      .num_resources    = ARRAY_SIZE(ohci_resources),
      .resource         = ohci_resources,
};

static inline void ohci_device_init(struct omap_usb_config *pdata)
{
      if (cpu_is_omap7xx())
            ohci_resources[1].start = INT_7XX_USB_HHC_1;
      pdata->ohci_device = &ohci_device;
}

#else

static inline void ohci_device_init(struct omap_usb_config *pdata)
{
}

#endif

#if   defined(CONFIG_USB_OTG) && defined(CONFIG_ARCH_OMAP_OTG)

static struct resource otg_resources[] = {
      /* order is significant! */
      {
            .start            = OTG_BASE,
            .end        = OTG_BASE + 0xff,
            .flags            = IORESOURCE_MEM,
      }, {
            .start            = INT_USB_IRQ_OTG,
            .flags            = IORESOURCE_IRQ,
      },
};

static struct platform_device otg_device = {
      .name       = "omap_otg",
      .id         = -1,
      .num_resources    = ARRAY_SIZE(otg_resources),
      .resource   = otg_resources,
};

static inline void otg_device_init(struct omap_usb_config *pdata)
{
      if (cpu_is_omap7xx())
            otg_resources[1].start = INT_7XX_USB_OTG;
      pdata->otg_device = &otg_device;
}

#else

static inline void otg_device_init(struct omap_usb_config *pdata)
{
}

#endif

u32 __init omap1_usb0_init(unsigned nwires, unsigned is_device)
{
      u32   syscon1 = 0;

      if (nwires == 0) {
            if (!cpu_is_omap15xx()) {
                  u32 l;

                  /* pulldown D+/D- */
                  l = omap_readl(USB_TRANSCEIVER_CTRL);
                  l &= ~(3 << 1);
                  omap_writel(l, USB_TRANSCEIVER_CTRL);
            }
            return 0;
      }

      if (is_device) {
            if (cpu_is_omap7xx()) {
                  omap_cfg_reg(AA17_7XX_USB_DM);
                  omap_cfg_reg(W16_7XX_USB_PU_EN);
                  omap_cfg_reg(W17_7XX_USB_VBUSI);
                  omap_cfg_reg(W18_7XX_USB_DMCK_OUT);
                  omap_cfg_reg(W19_7XX_USB_DCRST);
            } else
                  omap_cfg_reg(W4_USB_PUEN);
      }

      if (nwires == 2) {
            u32 l;

            // omap_cfg_reg(P9_USB_DP);
            // omap_cfg_reg(R8_USB_DM);

            if (cpu_is_omap15xx()) {
                  /* This works on 1510-Innovator */
                  return 0;
            }

            /* NOTES:
             *  - peripheral should configure VBUS detection!
             *  - only peripherals may use the internal D+/D- pulldowns
             *  - OTG support on this port not yet written
             */

            /* Don't do this for omap7xx -- it causes USB to not work correctly */
            if (!cpu_is_omap7xx()) {
                  l = omap_readl(USB_TRANSCEIVER_CTRL);
                  l &= ~(7 << 4);
                  if (!is_device)
                        l |= (3 << 1);
                  omap_writel(l, USB_TRANSCEIVER_CTRL);
            }

            return 3 << 16;
      }

      /* alternate pin config, external transceiver */
      if (cpu_is_omap15xx()) {
            printk(KERN_ERR "no usb0 alt pin config on 15xx\n");
            return 0;
      }

      omap_cfg_reg(V6_USB0_TXD);
      omap_cfg_reg(W9_USB0_TXEN);
      omap_cfg_reg(W5_USB0_SE0);
      if (nwires != 3)
            omap_cfg_reg(Y5_USB0_RCV);

      /* NOTE:  SPEED and SUSP aren't configured here.  OTG hosts
       * may be able to use I2C requests to set those bits along
       * with VBUS switching and overcurrent detection.
       */

      if (nwires != 6) {
            u32 l;

            l = omap_readl(USB_TRANSCEIVER_CTRL);
            l &= ~CONF_USB2_UNI_R;
            omap_writel(l, USB_TRANSCEIVER_CTRL);
      }

      switch (nwires) {
      case 3:
            syscon1 = 2;
            break;
      case 4:
            syscon1 = 1;
            break;
      case 6:
            syscon1 = 3;
            {
                  u32 l;

                  omap_cfg_reg(AA9_USB0_VP);
                  omap_cfg_reg(R9_USB0_VM);
                  l = omap_readl(USB_TRANSCEIVER_CTRL);
                  l |= CONF_USB2_UNI_R;
                  omap_writel(l, USB_TRANSCEIVER_CTRL);
            }
            break;
      default:
            printk(KERN_ERR "illegal usb%d %d-wire transceiver\n",
                  0, nwires);
      }

      return syscon1 << 16;
}

u32 __init omap1_usb1_init(unsigned nwires)
{
      u32   syscon1 = 0;

      if (!cpu_is_omap15xx() && nwires != 6) {
            u32 l;

            l = omap_readl(USB_TRANSCEIVER_CTRL);
            l &= ~CONF_USB1_UNI_R;
            omap_writel(l, USB_TRANSCEIVER_CTRL);
      }
      if (nwires == 0)
            return 0;

      /* external transceiver */
      omap_cfg_reg(USB1_TXD);
      omap_cfg_reg(USB1_TXEN);
      if (nwires != 3)
            omap_cfg_reg(USB1_RCV);

      if (cpu_is_omap15xx()) {
            omap_cfg_reg(USB1_SEO);
            omap_cfg_reg(USB1_SPEED);
            // SUSP
      } else if (cpu_is_omap1610() || cpu_is_omap5912()) {
            omap_cfg_reg(W13_1610_USB1_SE0);
            omap_cfg_reg(R13_1610_USB1_SPEED);
            // SUSP
      } else if (cpu_is_omap1710()) {
            omap_cfg_reg(R13_1710_USB1_SE0);
            // SUSP
      } else {
            pr_debug("usb%d cpu unrecognized\n", 1);
            return 0;
      }

      switch (nwires) {
      case 2:
            goto bad;
      case 3:
            syscon1 = 2;
            break;
      case 4:
            syscon1 = 1;
            break;
      case 6:
            syscon1 = 3;
            omap_cfg_reg(USB1_VP);
            omap_cfg_reg(USB1_VM);
            if (!cpu_is_omap15xx()) {
                  u32 l;

                  l = omap_readl(USB_TRANSCEIVER_CTRL);
                  l |= CONF_USB1_UNI_R;
                  omap_writel(l, USB_TRANSCEIVER_CTRL);
            }
            break;
      default:
bad:
            printk(KERN_ERR "illegal usb%d %d-wire transceiver\n",
                  1, nwires);
      }

      return syscon1 << 20;
}

u32 __init omap1_usb2_init(unsigned nwires, unsigned alt_pingroup)
{
      u32   syscon1 = 0;

      /* NOTE omap1 erratum: must leave USB2_UNI_R set if usb0 in use */
      if (alt_pingroup || nwires == 0)
            return 0;

      if (!cpu_is_omap15xx() && nwires != 6) {
            u32 l;

            l = omap_readl(USB_TRANSCEIVER_CTRL);
            l &= ~CONF_USB2_UNI_R;
            omap_writel(l, USB_TRANSCEIVER_CTRL);
      }

      /* external transceiver */
      if (cpu_is_omap15xx()) {
            omap_cfg_reg(USB2_TXD);
            omap_cfg_reg(USB2_TXEN);
            omap_cfg_reg(USB2_SEO);
            if (nwires != 3)
                  omap_cfg_reg(USB2_RCV);
            /* there is no USB2_SPEED */
      } else if (cpu_is_omap16xx()) {
            omap_cfg_reg(V6_USB2_TXD);
            omap_cfg_reg(W9_USB2_TXEN);
            omap_cfg_reg(W5_USB2_SE0);
            if (nwires != 3)
                  omap_cfg_reg(Y5_USB2_RCV);
            // FIXME omap_cfg_reg(USB2_SPEED);
      } else {
            pr_debug("usb%d cpu unrecognized\n", 1);
            return 0;
      }

      // omap_cfg_reg(USB2_SUSP);

      switch (nwires) {
      case 2:
            goto bad;
      case 3:
            syscon1 = 2;
            break;
      case 4:
            syscon1 = 1;
            break;
      case 5:
            goto bad;
      case 6:
            syscon1 = 3;
            if (cpu_is_omap15xx()) {
                  omap_cfg_reg(USB2_VP);
                  omap_cfg_reg(USB2_VM);
            } else {
                  u32 l;

                  omap_cfg_reg(AA9_USB2_VP);
                  omap_cfg_reg(R9_USB2_VM);
                  l = omap_readl(USB_TRANSCEIVER_CTRL);
                  l |= CONF_USB2_UNI_R;
                  omap_writel(l, USB_TRANSCEIVER_CTRL);
            }
            break;
      default:
bad:
            printk(KERN_ERR "illegal usb%d %d-wire transceiver\n",
                  2, nwires);
      }

      return syscon1 << 24;
}

#ifdef      CONFIG_ARCH_OMAP15XX

/* ULPD_DPLL_CTRL */
#define DPLL_IOB        (1 << 13)
#define DPLL_PLL_ENABLE       (1 << 4)
#define DPLL_LOCK       (1 << 0)

/* ULPD_APLL_CTRL */
#define APLL_NDPLL_SWITCH     (1 << 0)

static void __init omap_1510_usb_init(struct omap_usb_config *config)
{
      unsigned int val;
      u16 w;

      config->usb0_init(config->pins[0], is_usb0_device(config));
      config->usb1_init(config->pins[1]);
      config->usb2_init(config->pins[2], 0);

      val = omap_readl(MOD_CONF_CTRL_0) & ~(0x3f << 1);
      val |= (config->hmc_mode << 1);
      omap_writel(val, MOD_CONF_CTRL_0);

      printk("USB: hmc %d", config->hmc_mode);
      if (config->pins[0])
            printk(", usb0 %d wires%s", config->pins[0],
                  is_usb0_device(config) ? " (dev)" : "");
      if (config->pins[1])
            printk(", usb1 %d wires", config->pins[1]);
      if (config->pins[2])
            printk(", usb2 %d wires", config->pins[2]);
      printk("\n");

      /* use DPLL for 48 MHz function clock */
      pr_debug("APLL %04x DPLL %04x REQ %04x\n", omap_readw(ULPD_APLL_CTRL),
                  omap_readw(ULPD_DPLL_CTRL), omap_readw(ULPD_SOFT_REQ));

      w = omap_readw(ULPD_APLL_CTRL);
      w &= ~APLL_NDPLL_SWITCH;
      omap_writew(w, ULPD_APLL_CTRL);

      w = omap_readw(ULPD_DPLL_CTRL);
      w |= DPLL_IOB | DPLL_PLL_ENABLE;
      omap_writew(w, ULPD_DPLL_CTRL);

      w = omap_readw(ULPD_SOFT_REQ);
      w |= SOFT_UDC_REQ | SOFT_DPLL_REQ;
      omap_writew(w, ULPD_SOFT_REQ);

      while (!(omap_readw(ULPD_DPLL_CTRL) & DPLL_LOCK))
            cpu_relax();

#ifdef      CONFIG_USB_GADGET_OMAP
      if (config->register_dev) {
            int status;

            udc_device.dev.platform_data = config;
            status = platform_device_register(&udc_device);
            if (status)
                  pr_debug("can't register UDC device, %d\n", status);
            /* udc driver gates 48MHz by D+ pullup */
      }
#endif

#if   defined(CONFIG_USB_OHCI_HCD) || defined(CONFIG_USB_OHCI_HCD_MODULE)
      if (config->register_host) {
            int status;

            ohci_device.dev.platform_data = config;
            status = platform_device_register(&ohci_device);
            if (status)
                  pr_debug("can't register OHCI device, %d\n", status);
            /* hcd explicitly gates 48MHz */
      }
#endif
}

#else
static inline void omap_1510_usb_init(struct omap_usb_config *config) {}
#endif

void __init omap1_usb_init(struct omap_usb_config *pdata)
{
      pdata->usb0_init = omap1_usb0_init;
      pdata->usb1_init = omap1_usb1_init;
      pdata->usb2_init = omap1_usb2_init;
      udc_device_init(pdata);
      ohci_device_init(pdata);
      otg_device_init(pdata);

      if (cpu_is_omap7xx() || cpu_is_omap16xx())
            omap_otg_init(pdata);
      else if (cpu_is_omap15xx())
            omap_1510_usb_init(pdata);
      else
            printk(KERN_ERR "USB: No init for your chip yet\n");
}

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