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usb-musb.c

/*
 * linux/arch/arm/mach-omap2/usb-musb.c
 *
 * This file will contain the board specific details for the
 * MENTOR USB OTG controller on OMAP3430
 *
 * Copyright (C) 2007-2008 Texas Instruments
 * Copyright (C) 2008 Nokia Corporation
 * Author: Vikram Pandita
 *
 * Generalization by:
 * Felipe Balbi <felipe.balbi@nokia.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/types.h>
#include <linux/errno.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/dma-mapping.h>
#include <linux/io.h>

#include <linux/usb/musb.h>

#include <mach/hardware.h>
#include <mach/irqs.h>
#include <mach/am35xx.h>
#include <plat/usb.h>
#include "control.h"

#if defined(CONFIG_USB_MUSB_OMAP2PLUS) || defined (CONFIG_USB_MUSB_AM35X)

static void am35x_musb_reset(void)
{
      u32   regval;

      /* Reset the musb interface */
      regval = omap_ctrl_readl(AM35XX_CONTROL_IP_SW_RESET);

      regval |= AM35XX_USBOTGSS_SW_RST;
      omap_ctrl_writel(regval, AM35XX_CONTROL_IP_SW_RESET);

      regval &= ~AM35XX_USBOTGSS_SW_RST;
      omap_ctrl_writel(regval, AM35XX_CONTROL_IP_SW_RESET);

      regval = omap_ctrl_readl(AM35XX_CONTROL_IP_SW_RESET);
}

static void am35x_musb_phy_power(u8 on)
{
      unsigned long timeout = jiffies + msecs_to_jiffies(100);
      u32 devconf2;

      if (on) {
            /*
             * Start the on-chip PHY and its PLL.
             */
            devconf2 = omap_ctrl_readl(AM35XX_CONTROL_DEVCONF2);

            devconf2 &= ~(CONF2_RESET | CONF2_PHYPWRDN | CONF2_OTGPWRDN);
            devconf2 |= CONF2_PHY_PLLON;

            omap_ctrl_writel(devconf2, AM35XX_CONTROL_DEVCONF2);

            pr_info(KERN_INFO "Waiting for PHY clock good...\n");
            while (!(omap_ctrl_readl(AM35XX_CONTROL_DEVCONF2)
                        & CONF2_PHYCLKGD)) {
                  cpu_relax();

                  if (time_after(jiffies, timeout)) {
                        pr_err(KERN_ERR "musb PHY clock good timed out\n");
                        break;
                  }
            }
      } else {
            /*
             * Power down the on-chip PHY.
             */
            devconf2 = omap_ctrl_readl(AM35XX_CONTROL_DEVCONF2);

            devconf2 &= ~CONF2_PHY_PLLON;
            devconf2 |=  CONF2_PHYPWRDN | CONF2_OTGPWRDN;
            omap_ctrl_writel(devconf2, AM35XX_CONTROL_DEVCONF2);
      }
}

static void am35x_musb_clear_irq(void)
{
      u32 regval;

      regval = omap_ctrl_readl(AM35XX_CONTROL_LVL_INTR_CLEAR);
      regval |= AM35XX_USBOTGSS_INT_CLR;
      omap_ctrl_writel(regval, AM35XX_CONTROL_LVL_INTR_CLEAR);
      regval = omap_ctrl_readl(AM35XX_CONTROL_LVL_INTR_CLEAR);
}

static void am35x_musb_set_mode(u8 musb_mode)
{
      u32 devconf2 = omap_ctrl_readl(AM35XX_CONTROL_DEVCONF2);

      devconf2 &= ~CONF2_OTGMODE;
      switch (musb_mode) {
#ifdef      CONFIG_USB_MUSB_HDRC_HCD
      case MUSB_HOST:         /* Force VBUS valid, ID = 0 */
            devconf2 |= CONF2_FORCE_HOST;
            break;
#endif
#ifdef      CONFIG_USB_GADGET_MUSB_HDRC
      case MUSB_PERIPHERAL:   /* Force VBUS valid, ID = 1 */
            devconf2 |= CONF2_FORCE_DEVICE;
            break;
#endif
#ifdef      CONFIG_USB_MUSB_OTG
      case MUSB_OTG:          /* Don't override the VBUS/ID comparators */
            devconf2 |= CONF2_NO_OVERRIDE;
            break;
#endif
      default:
            pr_info(KERN_INFO "Unsupported mode %u\n", musb_mode);
      }

      omap_ctrl_writel(devconf2, AM35XX_CONTROL_DEVCONF2);
}

static struct resource musb_resources[] = {
      [0] = { /* start and end set dynamically */
            .flags      = IORESOURCE_MEM,
      },
      [1] = {     /* general IRQ */
            .start      = INT_243X_HS_USB_MC,
            .flags      = IORESOURCE_IRQ,
            .name = "mc",
      },
      [2] = {     /* DMA IRQ */
            .start      = INT_243X_HS_USB_DMA,
            .flags      = IORESOURCE_IRQ,
            .name = "dma",
      },
};

static struct musb_hdrc_config musb_config = {
      .multipoint = 1,
      .dyn_fifo   = 1,
      .num_eps    = 16,
      .ram_bits   = 12,
};

static struct musb_hdrc_platform_data musb_plat = {
#ifdef CONFIG_USB_MUSB_OTG
      .mode       = MUSB_OTG,
#elif defined(CONFIG_USB_MUSB_HDRC_HCD)
      .mode       = MUSB_HOST,
#elif defined(CONFIG_USB_GADGET_MUSB_HDRC)
      .mode       = MUSB_PERIPHERAL,
#endif
      /* .clock is set dynamically */
      .config           = &musb_config,

      /* REVISIT charge pump on TWL4030 can supply up to
       * 100 mA ... but this value is board-specific, like
       * "mode", and should be passed to usb_musb_init().
       */
      .power            = 50,             /* up to 100 mA */
};

static u64 musb_dmamask = DMA_BIT_MASK(32);

static struct platform_device musb_device = {
      .name       = "musb-omap2430",
      .id         = -1,
      .dev = {
            .dma_mask         = &musb_dmamask,
            .coherent_dma_mask      = DMA_BIT_MASK(32),
            .platform_data          = &musb_plat,
      },
      .num_resources    = ARRAY_SIZE(musb_resources),
      .resource   = musb_resources,
};

void __init usb_musb_init(struct omap_musb_board_data *board_data)
{
      if (cpu_is_omap243x()) {
            musb_resources[0].start = OMAP243X_HS_BASE;
      } else if (cpu_is_omap3517() || cpu_is_omap3505()) {
            musb_device.name = "musb-am35x";
            musb_resources[0].start = AM35XX_IPSS_USBOTGSS_BASE;
            musb_resources[1].start = INT_35XX_USBOTG_IRQ;
            board_data->set_phy_power = am35x_musb_phy_power;
            board_data->clear_irq = am35x_musb_clear_irq;
            board_data->set_mode = am35x_musb_set_mode;
            board_data->reset = am35x_musb_reset;
      } else if (cpu_is_omap34xx()) {
            musb_resources[0].start = OMAP34XX_HSUSB_OTG_BASE;
      } else if (cpu_is_omap44xx()) {
            musb_resources[0].start = OMAP44XX_HSUSB_OTG_BASE;
            musb_resources[1].start = OMAP44XX_IRQ_HS_USB_MC_N;
            musb_resources[2].start = OMAP44XX_IRQ_HS_USB_DMA_N;
      }
      musb_resources[0].end = musb_resources[0].start + SZ_4K - 1;

      /*
       * REVISIT: This line can be removed once all the platforms using
       * musb_core.c have been converted to use use clkdev.
       */
      musb_plat.clock = "ick";
      musb_plat.board_data = board_data;
      musb_plat.power = board_data->power >> 1;
      musb_plat.mode = board_data->mode;
      musb_plat.extvbus = board_data->extvbus;

      if (platform_device_register(&musb_device) < 0)
            printk(KERN_ERR "Unable to register HS-USB (MUSB) device\n");
}

#else
void __init usb_musb_init(struct omap_musb_board_data *board_data)
{
}
#endif /* CONFIG_USB_MUSB_SOC */

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