/* * Copyright (C) 2010 ST-Ericsson AB * Mian Yousaf Kaukab * * 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 #include #include #include #include #include #include #include #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 UX500_MUSB_ID: dev_dbg(musb->controller, "ID GND\n"); ux500_musb_set_vbus(musb, 1); break; case UX500_MUSB_VBUS: dev_dbg(musb->controller, "VBUS Connect\n"); break; case UX500_MUSB_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 "); MODULE_LICENSE("GPL v2"); module_platform_driver(ux500_driver);