/* * Copyright (C) 2005-2006 by Texas Instruments * * This file is part of the Inventra Controller Driver for Linux. * * The Inventra Controller Driver for Linux 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. * * The Inventra Controller Driver for Linux 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 The Inventra Controller Driver for Linux ; if not, * write to the Free Software Foundation, Inc., 59 Temple Place, * Suite 330, Boston, MA 02111-1307 USA * */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "musb_core.h" #ifdef CONFIG_MACH_DAVINCI_EVM #define GPIO_nVBUS_DRV 160 #endif #include "davinci.h" #include "cppi_dma.h" #define USB_PHY_CTRL IO_ADDRESS(USBPHY_CTL_PADDR) #define DM355_DEEPSLEEP IO_ADDRESS(DM355_DEEPSLEEP_PADDR) struct davinci_glue { struct device *dev; struct platform_device *musb; struct clk *clk; }; /* REVISIT (PM) we should be able to keep the PHY in low power mode most * of the time (24 MHZ oscillator and PLL off, etc) by setting POWER.D0 * and, when in host mode, autosuspending idle root ports... PHYPLLON * (overriding SUSPENDM?) then likely needs to stay off. */ static inline void phy_on(void) { u32 phy_ctrl = __raw_readl(USB_PHY_CTRL); /* power everything up; start the on-chip PHY and its PLL */ phy_ctrl &= ~(USBPHY_OSCPDWN | USBPHY_OTGPDWN | USBPHY_PHYPDWN); phy_ctrl |= USBPHY_SESNDEN | USBPHY_VBDTCTEN | USBPHY_PHYPLLON; __raw_writel(phy_ctrl, USB_PHY_CTRL); /* wait for PLL to lock before proceeding */ while ((__raw_readl(USB_PHY_CTRL) & USBPHY_PHYCLKGD) == 0) cpu_relax(); } static inline void phy_off(void) { u32 phy_ctrl = __raw_readl(USB_PHY_CTRL); /* powerdown the on-chip PHY, its PLL, and the OTG block */ phy_ctrl &= ~(USBPHY_SESNDEN | USBPHY_VBDTCTEN | USBPHY_PHYPLLON); phy_ctrl |= USBPHY_OSCPDWN | USBPHY_OTGPDWN | USBPHY_PHYPDWN; __raw_writel(phy_ctrl, USB_PHY_CTRL); } static int dma_off = 1; static void davinci_musb_enable(struct musb *musb) { u32 tmp, old, val; /* workaround: setup irqs through both register sets */ tmp = (musb->epmask & DAVINCI_USB_TX_ENDPTS_MASK) << DAVINCI_USB_TXINT_SHIFT; musb_writel(musb->ctrl_base, DAVINCI_USB_INT_MASK_SET_REG, tmp); old = tmp; tmp = (musb->epmask & (0xfffe & DAVINCI_USB_RX_ENDPTS_MASK)) << DAVINCI_USB_RXINT_SHIFT; musb_writel(musb->ctrl_base, DAVINCI_USB_INT_MASK_SET_REG, tmp); tmp |= old; val = ~MUSB_INTR_SOF; tmp |= ((val & 0x01ff) << DAVINCI_USB_USBINT_SHIFT); musb_writel(musb->ctrl_base, DAVINCI_USB_INT_MASK_SET_REG, tmp); if (is_dma_capable() && !dma_off) printk(KERN_WARNING "%s %s: dma not reactivated\n", __FILE__, __func__); else dma_off = 0; /* force a DRVVBUS irq so we can start polling for ID change */ if (is_otg_enabled(musb)) musb_writel(musb->ctrl_base, DAVINCI_USB_INT_SET_REG, DAVINCI_INTR_DRVVBUS << DAVINCI_USB_USBINT_SHIFT); } /* * Disable the HDRC and flush interrupts */ static void davinci_musb_disable(struct musb *musb) { /* because we don't set CTRLR.UINT, "important" to: * - not read/write INTRUSB/INTRUSBE * - (except during initial setup, as workaround) * - use INTSETR/INTCLRR instead */ musb_writel(musb->ctrl_base, DAVINCI_USB_INT_MASK_CLR_REG, DAVINCI_USB_USBINT_MASK | DAVINCI_USB_TXINT_MASK | DAVINCI_USB_RXINT_MASK); musb_writeb(musb->mregs, MUSB_DEVCTL, 0); musb_writel(musb->ctrl_base, DAVINCI_USB_EOI_REG, 0); if (is_dma_capable() && !dma_off) WARNING("dma still active\n"); } #define portstate(stmt) stmt /* * VBUS SWITCHING IS BOARD-SPECIFIC ... at least for the DM6446 EVM, * which doesn't wire DRVVBUS to the FET that switches it. Unclear * if that's a problem with the DM6446 chip or just with that board. * * In either case, the DM355 EVM automates DRVVBUS the normal way, * when J10 is out, and TI documents it as handling OTG. */ #ifdef CONFIG_MACH_DAVINCI_EVM static int vbus_state = -1; /* I2C operations are always synchronous, and require a task context. * With unloaded systems, using the shared workqueue seems to suffice * to satisfy the 100msec A_WAIT_VRISE timeout... */ static void evm_deferred_drvvbus(struct work_struct *ignored) { gpio_set_value_cansleep(GPIO_nVBUS_DRV, vbus_state); vbus_state = !vbus_state; } #endif /* EVM */ static void davinci_musb_source_power(struct musb *musb, int is_on, int immediate) { #ifdef CONFIG_MACH_DAVINCI_EVM if (is_on) is_on = 1; if (vbus_state == is_on) return; vbus_state = !is_on; /* 0/1 vs "-1 == unknown/init" */ if (machine_is_davinci_evm()) { static DECLARE_WORK(evm_vbus_work, evm_deferred_drvvbus); if (immediate) gpio_set_value_cansleep(GPIO_nVBUS_DRV, vbus_state); else schedule_work(&evm_vbus_work); } if (immediate) vbus_state = is_on; #endif } static void davinci_musb_set_vbus(struct musb *musb, int is_on) { WARN_ON(is_on && is_peripheral_active(musb)); davinci_musb_source_power(musb, is_on, 0); } #define POLL_SECONDS 2 static struct timer_list otg_workaround; static void otg_timer(unsigned long _musb) { struct musb *musb = (void *)_musb; void __iomem *mregs = musb->mregs; u8 devctl; unsigned long flags; /* We poll because DaVinci's won't expose several OTG-critical * status change events (from the transceiver) otherwise. */ devctl = musb_readb(mregs, MUSB_DEVCTL); dev_dbg(musb->controller, "poll devctl %02x (%s)\n", devctl, otg_state_string(musb->xceiv->state)); spin_lock_irqsave(&musb->lock, flags); switch (musb->xceiv->state) { case OTG_STATE_A_WAIT_VFALL: /* Wait till VBUS falls below SessionEnd (~0.2V); the 1.3 RTL * seems to mis-handle session "start" otherwise (or in our * case "recover"), in routine "VBUS was valid by the time * VBUSERR got reported during enumeration" cases. */ if (devctl & MUSB_DEVCTL_VBUS) { mod_timer(&otg_workaround, jiffies + POLL_SECONDS * HZ); break; } musb->xceiv->state = OTG_STATE_A_WAIT_VRISE; musb_writel(musb->ctrl_base, DAVINCI_USB_INT_SET_REG, MUSB_INTR_VBUSERROR << DAVINCI_USB_USBINT_SHIFT); break; case OTG_STATE_B_IDLE: if (!is_peripheral_enabled(musb)) break; /* There's no ID-changed IRQ, so we have no good way to tell * when to switch to the A-Default state machine (by setting * the DEVCTL.SESSION flag). * * Workaround: whenever we're in B_IDLE, try setting the * session flag every few seconds. If it works, ID was * grounded and we're now in the A-Default state machine. * * NOTE setting the session flag is _supposed_ to trigger * SRP, but clearly it doesn't. */ musb_writeb(mregs, MUSB_DEVCTL, devctl | MUSB_DEVCTL_SESSION); devctl = musb_readb(mregs, MUSB_DEVCTL); if (devctl & MUSB_DEVCTL_BDEVICE) mod_timer(&otg_workaround, jiffies + POLL_SECONDS * HZ); else musb->xceiv->state = OTG_STATE_A_IDLE; break; default: break; } spin_unlock_irqrestore(&musb->lock, flags); } static irqreturn_t davinci_musb_interrupt(int irq, void *__hci) { unsigned long flags; irqreturn_t retval = IRQ_NONE; struct musb *musb = __hci; void __iomem *tibase = musb->ctrl_base; struct cppi *cppi; u32 tmp; spin_lock_irqsave(&musb->lock, flags); /* NOTE: DaVinci shadows the Mentor IRQs. Don't manage them through * the Mentor registers (except for setup), use the TI ones and EOI. * * Docs describe irq "vector" registers associated with the CPPI and * USB EOI registers. These hold a bitmask corresponding to the * current IRQ, not an irq handler address. Would using those bits * resolve some of the races observed in this dispatch code?? */ /* CPPI interrupts share the same IRQ line, but have their own * mask, state, "vector", and EOI registers. */ cppi = container_of(musb->dma_controller, struct cppi, controller); if (is_cppi_enabled() && musb->dma_controller && !cppi->irq) retval = cppi_interrupt(irq, __hci); /* ack and handle non-CPPI interrupts */ tmp = musb_readl(tibase, DAVINCI_USB_INT_SRC_MASKED_REG); musb_writel(tibase, DAVINCI_USB_INT_SRC_CLR_REG, tmp); dev_dbg(musb->controller, "IRQ %08x\n", tmp); musb->int_rx = (tmp & DAVINCI_USB_RXINT_MASK) >> DAVINCI_USB_RXINT_SHIFT; musb->int_tx = (tmp & DAVINCI_USB_TXINT_MASK) >> DAVINCI_USB_TXINT_SHIFT; musb->int_usb = (tmp & DAVINCI_USB_USBINT_MASK) >> DAVINCI_USB_USBINT_SHIFT; /* DRVVBUS irqs are the only proxy we have (a very poor one!) for * DaVinci's missing ID change IRQ. We need an ID change IRQ to * switch appropriately between halves of the OTG state machine. * Managing DEVCTL.SESSION per Mentor docs requires we know its * value, but DEVCTL.BDEVICE is invalid without DEVCTL.SESSION set. * Also, DRVVBUS pulses for SRP (but not at 5V) ... */ if (tmp & (DAVINCI_INTR_DRVVBUS << DAVINCI_USB_USBINT_SHIFT)) { int drvvbus = musb_readl(tibase, DAVINCI_USB_STAT_REG); void __iomem *mregs = musb->mregs; u8 devctl = musb_readb(mregs, MUSB_DEVCTL); int err = musb->int_usb & MUSB_INTR_VBUSERROR; err = is_host_enabled(musb) && (musb->int_usb & MUSB_INTR_VBUSERROR); if (err) { /* The Mentor core doesn't debounce VBUS as needed * to cope with device connect current spikes. This * means it's not uncommon for bus-powered devices * to get VBUS errors during enumeration. * * This is a workaround, but newer RTL from Mentor * seems to allow a better one: "re"starting sessions * without waiting (on EVM, a **long** time) for VBUS * to stop registering in devctl. */ musb->int_usb &= ~MUSB_INTR_VBUSERROR; musb->xceiv->state = OTG_STATE_A_WAIT_VFALL; mod_timer(&otg_workaround, jiffies + POLL_SECONDS * HZ); WARNING("VBUS error workaround (delay coming)\n"); } else if (is_host_enabled(musb) && drvvbus) { MUSB_HST_MODE(musb); musb->xceiv->default_a = 1; musb->xceiv->state = OTG_STATE_A_WAIT_VRISE; portstate(musb->port1_status |= USB_PORT_STAT_POWER); del_timer(&otg_workaround); } else { musb->is_active = 0; MUSB_DEV_MODE(musb); musb->xceiv->default_a = 0; musb->xceiv->state = OTG_STATE_B_IDLE; portstate(musb->port1_status &= ~USB_PORT_STAT_POWER); } /* NOTE: this must complete poweron within 100 msec * (OTG_TIME_A_WAIT_VRISE) but we don't check for that. */ davinci_musb_source_power(musb, drvvbus, 0); dev_dbg(musb->controller, "VBUS %s (%s)%s, devctl %02x\n", drvvbus ? "on" : "off", otg_state_string(musb->xceiv->state), err ? " ERROR" : "", devctl); retval = IRQ_HANDLED; } if (musb->int_tx || musb->int_rx || musb->int_usb) retval |= musb_interrupt(musb); /* irq stays asserted until EOI is written */ musb_writel(tibase, DAVINCI_USB_EOI_REG, 0); /* poll for ID change */ if (is_otg_enabled(musb) && musb->xceiv->state == OTG_STATE_B_IDLE) mod_timer(&otg_workaround, jiffies + POLL_SECONDS * HZ); spin_unlock_irqrestore(&musb->lock, flags); return retval; } static int davinci_musb_set_mode(struct musb *musb, u8 mode) { /* EVM can't do this (right?) */ return -EIO; } static int davinci_musb_init(struct musb *musb) { void __iomem *tibase = musb->ctrl_base; u32 revision; usb_nop_xceiv_register(); musb->xceiv = otg_get_transceiver(); if (!musb->xceiv) return -ENODEV; musb->mregs += DAVINCI_BASE_OFFSET; /* returns zero if e.g. not clocked */ revision = musb_readl(tibase, DAVINCI_USB_VERSION_REG); if (revision == 0) goto fail; if (is_host_enabled(musb)) setup_timer(&otg_workaround, otg_timer, (unsigned long) musb); davinci_musb_source_power(musb, 0, 1); /* dm355 EVM swaps D+/D- for signal integrity, and * is clocked from the main 24 MHz crystal. */ if (machine_is_davinci_dm355_evm()) { u32 phy_ctrl = __raw_readl(USB_PHY_CTRL); phy_ctrl &= ~(3 << 9); phy_ctrl |= USBPHY_DATAPOL; __raw_writel(phy_ctrl, USB_PHY_CTRL); } /* On dm355, the default-A state machine needs DRVVBUS control. * If we won't be a host, there's no need to turn it on. */ if (cpu_is_davinci_dm355()) { u32 deepsleep = __raw_readl(DM355_DEEPSLEEP); if (is_host_enabled(musb)) { deepsleep &= ~DRVVBUS_OVERRIDE; } else { deepsleep &= ~DRVVBUS_FORCE; deepsleep |= DRVVBUS_OVERRIDE; } __raw_writel(deepsleep, DM355_DEEPSLEEP); } /* reset the controller */ musb_writel(tibase, DAVINCI_USB_CTRL_REG, 0x1); /* start the on-chip PHY and its PLL */ phy_on(); msleep(5); /* NOTE: irqs are in mixed mode, not bypass to pure-musb */ pr_debug("DaVinci OTG revision %08x phy %03x control %02x\n", revision, __raw_readl(USB_PHY_CTRL), musb_readb(tibase, DAVINCI_USB_CTRL_REG)); musb->isr = davinci_musb_interrupt; return 0; fail: otg_put_transceiver(musb->xceiv); usb_nop_xceiv_unregister(); return -ENODEV; } static int davinci_musb_exit(struct musb *musb) { if (is_host_enabled(musb)) del_timer_sync(&otg_workaround); /* force VBUS off */ if (cpu_is_davinci_dm355()) { u32 deepsleep = __raw_readl(DM355_DEEPSLEEP); deepsleep &= ~DRVVBUS_FORCE; deepsleep |= DRVVBUS_OVERRIDE; __raw_writel(deepsleep, DM355_DEEPSLEEP); } davinci_musb_source_power(musb, 0 /*off*/, 1); /* delay, to avoid problems with module reload */ if (is_host_enabled(musb) && musb->xceiv->default_a) { int maxdelay = 30; u8 devctl, warn = 0; /* if there's no peripheral connected, this can take a * long time to fall, especially on EVM with huge C133. */ do { devctl = musb_readb(musb->mregs, MUSB_DEVCTL); if (!(devctl & MUSB_DEVCTL_VBUS)) break; if ((devctl & MUSB_DEVCTL_VBUS) != warn) { warn = devctl & MUSB_DEVCTL_VBUS; dev_dbg(musb->controller, "VBUS %d\n", warn >> MUSB_DEVCTL_VBUS_SHIFT); } msleep(1000); maxdelay--; } while (maxdelay > 0); /* in OTG mode, another host might be connected */ if (devctl & MUSB_DEVCTL_VBUS) dev_dbg(musb->controller, "VBUS off timeout (devctl %02x)\n", devctl); } phy_off(); otg_put_transceiver(musb->xceiv); usb_nop_xceiv_unregister(); return 0; } static const struct musb_platform_ops davinci_ops = { .init = davinci_musb_init, .exit = davinci_musb_exit, .enable = davinci_musb_enable, .disable = davinci_musb_disable, .set_mode = davinci_musb_set_mode, .set_vbus = davinci_musb_set_vbus, }; static u64 davinci_dmamask = DMA_BIT_MASK(32); static int __init davinci_probe(struct platform_device *pdev) { struct musb_hdrc_platform_data *pdata = pdev->dev.platform_data; struct platform_device *musb; struct davinci_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", -1); 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 err2; } ret = clk_enable(clk); if (ret) { dev_err(&pdev->dev, "failed to enable clock\n"); goto err3; } musb->dev.parent = &pdev->dev; musb->dev.dma_mask = &davinci_dmamask; musb->dev.coherent_dma_mask = davinci_dmamask; glue->dev = &pdev->dev; glue->musb = musb; glue->clk = clk; pdata->platform_ops = &davinci_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 err4; } ret = platform_device_add_data(musb, pdata, sizeof(*pdata)); if (ret) { dev_err(&pdev->dev, "failed to add platform_data\n"); goto err4; } ret = platform_device_add(musb); if (ret) { dev_err(&pdev->dev, "failed to register musb device\n"); goto err4; } return 0; err4: clk_disable(clk); err3: clk_put(clk); err2: platform_device_put(musb); err1: kfree(glue); err0: return ret; } static int __exit davinci_remove(struct platform_device *pdev) { struct davinci_glue *glue = platform_get_drvdata(pdev); platform_device_del(glue->musb); platform_device_put(glue->musb); clk_disable(glue->clk); clk_put(glue->clk); kfree(glue); return 0; } static struct platform_driver davinci_driver = { .remove = __exit_p(davinci_remove), .driver = { .name = "musb-davinci", }, }; MODULE_DESCRIPTION("DaVinci MUSB Glue Layer"); MODULE_AUTHOR("Felipe Balbi "); MODULE_LICENSE("GPL v2"); static int __init davinci_init(void) { return platform_driver_probe(&davinci_driver, davinci_probe); } subsys_initcall(davinci_init); static void __exit davinci_exit(void) { platform_driver_unregister(&davinci_driver); } module_exit(davinci_exit);