| /* |
| * Copyright (C) 2010 ST-Ericsson AB |
| * Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com> |
| * |
| * Based on omap2430.c |
| * |
| * 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., 675 Mass Ave, Cambridge, MA 02139, USA. |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/kernel.h> |
| #include <linux/init.h> |
| #include <linux/clk.h> |
| #include <linux/err.h> |
| #include <linux/io.h> |
| #include <linux/platform_device.h> |
| |
| #include "musb_core.h" |
| |
| struct ux500_glue { |
| struct device *dev; |
| struct platform_device *musb; |
| struct clk *clk; |
| }; |
| #define glue_to_musb(g) platform_get_drvdata(g->musb) |
| |
| static void ux500_musb_set_vbus(struct musb *musb, int is_on) |
| { |
| u8 devctl; |
| unsigned long timeout = jiffies + msecs_to_jiffies(1000); |
| /* HDRC controls CPEN, but beware current surges during device |
| * connect. They can trigger transient overcurrent conditions |
| * that must be ignored. |
| */ |
| |
| devctl = musb_readb(musb->mregs, MUSB_DEVCTL); |
| |
| if (is_on) { |
| if (musb->xceiv->state == OTG_STATE_A_IDLE) { |
| /* start the session */ |
| devctl |= MUSB_DEVCTL_SESSION; |
| musb_writeb(musb->mregs, MUSB_DEVCTL, devctl); |
| /* |
| * Wait for the musb to set as A device to enable the |
| * VBUS |
| */ |
| while (musb_readb(musb->mregs, MUSB_DEVCTL) & 0x80) { |
| |
| if (time_after(jiffies, timeout)) { |
| dev_err(musb->controller, |
| "configured as A device timeout"); |
| break; |
| } |
| } |
| |
| } else { |
| musb->is_active = 1; |
| musb->xceiv->otg->default_a = 1; |
| musb->xceiv->state = OTG_STATE_A_WAIT_VRISE; |
| devctl |= MUSB_DEVCTL_SESSION; |
| MUSB_HST_MODE(musb); |
| } |
| } else { |
| musb->is_active = 0; |
| |
| /* NOTE: we're skipping A_WAIT_VFALL -> A_IDLE and jumping |
| * right to B_IDLE... |
| */ |
| musb->xceiv->otg->default_a = 0; |
| devctl &= ~MUSB_DEVCTL_SESSION; |
| MUSB_DEV_MODE(musb); |
| } |
| musb_writeb(musb->mregs, MUSB_DEVCTL, devctl); |
| |
| /* |
| * Devctl values will be updated after vbus goes below |
| * session_valid. The time taken depends on the capacitance |
| * on VBUS line. The max discharge time can be upto 1 sec |
| * as per the spec. Typically on our platform, it is 200ms |
| */ |
| if (!is_on) |
| mdelay(200); |
| |
| dev_dbg(musb->controller, "VBUS %s, devctl %02x\n", |
| usb_otg_state_string(musb->xceiv->state), |
| musb_readb(musb->mregs, MUSB_DEVCTL)); |
| } |
| |
| static int musb_otg_notifications(struct notifier_block *nb, |
| unsigned long event, void *unused) |
| { |
| struct musb *musb = container_of(nb, struct musb, nb); |
| |
| dev_dbg(musb->controller, "musb_otg_notifications %ld %s\n", |
| event, usb_otg_state_string(musb->xceiv->state)); |
| |
| switch (event) { |
| case USB_EVENT_ID: |
| dev_dbg(musb->controller, "ID GND\n"); |
| ux500_musb_set_vbus(musb, 1); |
| break; |
| case USB_EVENT_VBUS: |
| dev_dbg(musb->controller, "VBUS Connect\n"); |
| ux500_musb_set_vbus(musb, 0); |
| break; |
| case USB_EVENT_NONE: |
| dev_dbg(musb->controller, "VBUS Disconnect\n"); |
| if (is_host_active(musb)) |
| ux500_musb_set_vbus(musb, 0); |
| else |
| musb->xceiv->state = OTG_STATE_B_IDLE; |
| break; |
| default: |
| dev_dbg(musb->controller, "ID float\n"); |
| return NOTIFY_DONE; |
| } |
| return NOTIFY_OK; |
| } |
| |
| static irqreturn_t ux500_musb_interrupt(int irq, void *__hci) |
| { |
| unsigned long flags; |
| irqreturn_t retval = IRQ_NONE; |
| struct musb *musb = __hci; |
| |
| spin_lock_irqsave(&musb->lock, flags); |
| |
| musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB); |
| musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX); |
| musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX); |
| |
| if (musb->int_usb || musb->int_tx || musb->int_rx) |
| retval = musb_interrupt(musb); |
| |
| spin_unlock_irqrestore(&musb->lock, flags); |
| |
| return retval; |
| } |
| |
| static int ux500_musb_init(struct musb *musb) |
| { |
| int status; |
| |
| musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2); |
| if (IS_ERR_OR_NULL(musb->xceiv)) { |
| pr_err("HS USB OTG: no transceiver configured\n"); |
| return -EPROBE_DEFER; |
| } |
| |
| musb->nb.notifier_call = musb_otg_notifications; |
| status = usb_register_notifier(musb->xceiv, &musb->nb); |
| if (status < 0) { |
| dev_dbg(musb->controller, "notification register failed\n"); |
| return status; |
| } |
| |
| musb->isr = ux500_musb_interrupt; |
| |
| return 0; |
| } |
| |
| static int ux500_musb_exit(struct musb *musb) |
| { |
| usb_unregister_notifier(musb->xceiv, &musb->nb); |
| |
| usb_put_phy(musb->xceiv); |
| |
| return 0; |
| } |
| |
| static const struct musb_platform_ops ux500_ops = { |
| .init = ux500_musb_init, |
| .exit = ux500_musb_exit, |
| |
| .set_vbus = ux500_musb_set_vbus, |
| }; |
| |
| static int ux500_probe(struct platform_device *pdev) |
| { |
| struct musb_hdrc_platform_data *pdata = pdev->dev.platform_data; |
| struct platform_device *musb; |
| struct ux500_glue *glue; |
| struct clk *clk; |
| int ret = -ENOMEM; |
| |
| glue = kzalloc(sizeof(*glue), GFP_KERNEL); |
| if (!glue) { |
| dev_err(&pdev->dev, "failed to allocate glue context\n"); |
| goto err0; |
| } |
| |
| musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO); |
| if (!musb) { |
| dev_err(&pdev->dev, "failed to allocate musb device\n"); |
| goto err1; |
| } |
| |
| clk = clk_get(&pdev->dev, "usb"); |
| if (IS_ERR(clk)) { |
| dev_err(&pdev->dev, "failed to get clock\n"); |
| ret = PTR_ERR(clk); |
| goto err3; |
| } |
| |
| ret = clk_prepare_enable(clk); |
| if (ret) { |
| dev_err(&pdev->dev, "failed to enable clock\n"); |
| goto err4; |
| } |
| |
| musb->dev.parent = &pdev->dev; |
| musb->dev.dma_mask = pdev->dev.dma_mask; |
| musb->dev.coherent_dma_mask = pdev->dev.coherent_dma_mask; |
| |
| glue->dev = &pdev->dev; |
| glue->musb = musb; |
| glue->clk = clk; |
| |
| pdata->platform_ops = &ux500_ops; |
| |
| platform_set_drvdata(pdev, glue); |
| |
| ret = platform_device_add_resources(musb, pdev->resource, |
| pdev->num_resources); |
| if (ret) { |
| dev_err(&pdev->dev, "failed to add resources\n"); |
| goto err5; |
| } |
| |
| ret = platform_device_add_data(musb, pdata, sizeof(*pdata)); |
| if (ret) { |
| dev_err(&pdev->dev, "failed to add platform_data\n"); |
| goto err5; |
| } |
| |
| ret = platform_device_add(musb); |
| if (ret) { |
| dev_err(&pdev->dev, "failed to register musb device\n"); |
| goto err5; |
| } |
| |
| return 0; |
| |
| err5: |
| clk_disable_unprepare(clk); |
| |
| err4: |
| clk_put(clk); |
| |
| err3: |
| platform_device_put(musb); |
| |
| err1: |
| kfree(glue); |
| |
| err0: |
| return ret; |
| } |
| |
| static int ux500_remove(struct platform_device *pdev) |
| { |
| struct ux500_glue *glue = platform_get_drvdata(pdev); |
| |
| platform_device_unregister(glue->musb); |
| clk_disable_unprepare(glue->clk); |
| clk_put(glue->clk); |
| kfree(glue); |
| |
| return 0; |
| } |
| |
| #ifdef CONFIG_PM |
| static int ux500_suspend(struct device *dev) |
| { |
| struct ux500_glue *glue = dev_get_drvdata(dev); |
| struct musb *musb = glue_to_musb(glue); |
| |
| usb_phy_set_suspend(musb->xceiv, 1); |
| clk_disable_unprepare(glue->clk); |
| |
| return 0; |
| } |
| |
| static int ux500_resume(struct device *dev) |
| { |
| struct ux500_glue *glue = dev_get_drvdata(dev); |
| struct musb *musb = glue_to_musb(glue); |
| int ret; |
| |
| ret = clk_prepare_enable(glue->clk); |
| if (ret) { |
| dev_err(dev, "failed to enable clock\n"); |
| return ret; |
| } |
| |
| usb_phy_set_suspend(musb->xceiv, 0); |
| |
| return 0; |
| } |
| |
| static const struct dev_pm_ops ux500_pm_ops = { |
| .suspend = ux500_suspend, |
| .resume = ux500_resume, |
| }; |
| |
| #define DEV_PM_OPS (&ux500_pm_ops) |
| #else |
| #define DEV_PM_OPS NULL |
| #endif |
| |
| static struct platform_driver ux500_driver = { |
| .probe = ux500_probe, |
| .remove = ux500_remove, |
| .driver = { |
| .name = "musb-ux500", |
| .pm = DEV_PM_OPS, |
| }, |
| }; |
| |
| MODULE_DESCRIPTION("UX500 MUSB Glue Layer"); |
| MODULE_AUTHOR("Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>"); |
| MODULE_LICENSE("GPL v2"); |
| module_platform_driver(ux500_driver); |