/* * 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 "musbdefs.h" #if defined (CONFIG_MACH_DAVINCI_EVM) && !defined (CONFIG_USB_MUSB_AVM_BOARD) #include #endif #include "davinci.h" #include "cppi_dma.h" /* 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) { /* start the on-chip PHY and its PLL */ #if defined (CONFIG_USB_MUSB_AVM_BOARD) /* no VBUS SWITCHING possible on AVM_BOARD */ __raw_writel(USBPHY_PHYPLLON, IO_ADDRESS(USBPHY_CTL_PADDR)); #else __raw_writel(USBPHY_SESNDEN | USBPHY_VBDTCTEN | USBPHY_PHYPLLON, IO_ADDRESS(USBPHY_CTL_PADDR)); #endif while ((__raw_readl(IO_ADDRESS(USBPHY_CTL_PADDR)) & USBPHY_PHYCLKGD) == 0) cpu_relax(); } static inline void phy_off(void) { /* powerdown the on-chip PHY and its oscillator */ __raw_writel(USBPHY_OSCPDWN | USBPHY_PHYPDWN, IO_ADDRESS(USBPHY_CTL_PADDR)); } static int dma_off = 1; void musb_platform_enable(struct musb *musb) { u32 tmp, old, val; /* workaround: setup irqs through both register sets */ tmp = (musb->wEndMask & 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->wEndMask & (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 = ~MGC_M_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__, __FUNCTION__); else dma_off = 0; } /* * Disable the HDRC and flush interrupts */ void musb_platform_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->pRegs, MGC_O_HDRC_DEVCTL, 0); musb_writel(musb->ctrl_base, DAVINCI_USB_EOI_REG, 0); if (is_dma_capable() && !dma_off) WARN("dma still active\n"); } /* REVISIT this file shouldn't modify the OTG state machine ... * * The OTG infrastructure needs updating, to include things like * offchip DRVVBUS support and replacing MGC_OtgMachineInputs with * musb struct members (so e.g. vbus_state vanishes). */ static int vbus_state = -1; #ifdef CONFIG_USB_MUSB_HDRC_HCD #define portstate(stmt) stmt #else #define portstate(stmt) #endif static void session(struct musb *musb, int is_on) { void *__iomem mregs = musb->pRegs; if (musb->xceiv.default_a) { u8 devctl = musb_readb(mregs, MGC_O_HDRC_DEVCTL); if (is_on) devctl |= MGC_M_DEVCTL_SESSION; else devctl &= ~MGC_M_DEVCTL_SESSION; musb_writeb(mregs, MGC_O_HDRC_DEVCTL, devctl); } else is_on = 0; if (is_on) { /* NOTE: assumes VBUS already exceeds A-valid */ musb->xceiv.state = OTG_STATE_A_WAIT_BCON; portstate(musb->port1_status |= USB_PORT_STAT_POWER); MUSB_HST_MODE(musb); } else { switch (musb->xceiv.state) { case OTG_STATE_UNDEFINED: case OTG_STATE_B_IDLE: MUSB_DEV_MODE(musb); musb->xceiv.state = OTG_STATE_B_IDLE; break; case OTG_STATE_A_IDLE: break; default: musb->xceiv.state = OTG_STATE_A_WAIT_VFALL; break; } portstate(musb->port1_status &= ~USB_PORT_STAT_POWER); } DBG(2, "Default-%c, VBUS power %s, %s, devctl %02x, %s\n", musb->xceiv.default_a ? 'A' : 'B', is_on ? "on" : "off", MUSB_MODE(musb), musb_readb(musb->pRegs, MGC_O_HDRC_DEVCTL), otg_state_string(musb)); } /* VBUS SWITCHING IS BOARD-SPECIFIC */ #if defined (CONFIG_MACH_DAVINCI_EVM) && !defined (CONFIG_USB_MUSB_AVM_BOARD) #ifndef CONFIG_MACH_DAVINCI_EVM_OTG /* 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(void *_musb) { struct musb *musb = _musb; int is_on = (musb->xceiv.state == OTG_STATE_A_IDLE); davinci_i2c_expander_op(CONFIG_DAVINCI_I2C_EXPANDER_ADDR, USB_DRVVBUS, !is_on); vbus_state = is_on; session(musb, is_on); } DECLARE_WORK(evm_vbus_work, evm_deferred_drvvbus, 0); #endif /* modified board */ #endif /* EVM */ static void davinci_vbus_power(struct musb *musb, int is_on, int immediate) { if (is_on) is_on = 1; if (vbus_state == is_on) return; #if defined (CONFIG_MACH_DAVINCI_EVM) && !defined (CONFIG_USB_MUSB_AVM_BOARD) if (machine_is_davinci_evm()) { #ifdef CONFIG_MACH_DAVINCI_EVM_OTG /* modified EVM board switching VBUS with GPIO(6) not I2C * NOTE: PINMUX0.RGB888 (bit23) must be clear */ if (is_on) gpio_set(GPIO(6)); else gpio_clear(GPIO(6)); immediate = 1; #else if (immediate) davinci_i2c_expander_op(CONFIG_DAVINCI_I2C_EXPANDER_ADDR, USB_DRVVBUS, !is_on); else schedule_work(&evm_vbus_work); #endif } #endif if (immediate) { vbus_state = is_on; session(musb, is_on); } else { /* REVISIT: if is_on, start in A_WAIT_VRISE, then OTG timer * should watch for session valid before calling session(). * EVM charges C133 VERY quickly (but discharge is sloooow). */ } } static void davinci_set_vbus(struct musb *musb, int is_on) { WARN_ON(is_on && is_peripheral_active(musb)); return davinci_vbus_power(musb, is_on, 0); } static irqreturn_t davinci_interrupt(int irq, void *__hci) { unsigned long flags; irqreturn_t retval = IRQ_NONE; struct musb *musb = __hci; void *__iomem tibase = musb->ctrl_base; 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 asociated 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. */ if (is_cppi_enabled()) { u32 cppi_tx = musb_readl(tibase, DAVINCI_TXCPPI_MASKED_REG); u32 cppi_rx = musb_readl(tibase, DAVINCI_RXCPPI_MASKED_REG); if (cppi_tx || cppi_rx) { DBG(4, "<== CPPI IRQ t%x r%x\n", cppi_tx, cppi_rx); cppi_completion(musb, cppi_rx, cppi_tx); retval = IRQ_HANDLED; } } /* 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); 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; # if !defined (CONFIG_USB_MUSB_AVM_BOARD) /* treat DRVVBUS irq like an ID change IRQ (for now) */ if (tmp & (1 << (8 + DAVINCI_USB_USBINT_SHIFT))) { int drvvbus = musb_readl(tibase, DAVINCI_USB_STAT_REG); if (drvvbus) { MUSB_HST_MODE(musb); musb->xceiv.default_a = 1; musb->xceiv.state = OTG_STATE_A_IDLE; } else { MUSB_DEV_MODE(musb); musb->xceiv.default_a = 0; musb->xceiv.state = OTG_STATE_B_IDLE; } /* NOTE: this must complete poweron within 100 msec */ davinci_vbus_power(musb, drvvbus, 0); DBG(2, "DRVVBUS %d (%s)\n", drvvbus, otg_state_string(musb)); retval = IRQ_HANDLED; } # endif 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); spin_unlock_irqrestore(&musb->Lock, flags); /* REVISIT we sometimes get unhandled IRQs * (e.g. ep0). not clear why... */ if (retval != IRQ_HANDLED) DBG(5, "unhandled? %08x\n", tmp); return IRQ_HANDLED; } int __devinit musb_platform_init(struct musb *musb) { void *__iomem tibase = musb->ctrl_base; u32 revision; musb->pRegs += DAVINCI_BASE_OFFSET; #if 0 /* REVISIT there's something odd about clocking, this * didn't appear do the job ... */ musb->clock = clk_get(pDevice, "usb"); if (IS_ERR(musb->clock)) return PTR_ERR(musb->clock); status = clk_enable(musb->clock); if (status < 0) return -ENODEV; #endif /* returns zero if e.g. not clocked */ revision = musb_readl(tibase, DAVINCI_USB_VERSION_REG); if (revision == 0) return -ENODEV; #if defined (CONFIG_MACH_DAVINCI_EVM) && !defined (CONFIG_USB_MUSB_AVM_BOARD) if (machine_is_davinci_evm()) evm_vbus_work.data = musb; #endif musb->board_set_vbus = davinci_set_vbus; davinci_vbus_power(musb, 0, 1); /* 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((void *__iomem) IO_ADDRESS(USBPHY_CTL_PADDR)), musb_readb(tibase, DAVINCI_USB_CTRL_REG)); musb->isr = davinci_interrupt; return 0; } int musb_platform_exit(struct musb *musb) { davinci_vbus_power(musb, 0 /*off*/, 1); /* delay, to avoid problems with module reload */ if (is_host_enabled(musb)) { 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->pRegs, MGC_O_HDRC_DEVCTL); if (!(devctl & MGC_M_DEVCTL_VBUS)) break; if ((devctl & MGC_M_DEVCTL_VBUS) != warn) { warn = devctl & MGC_M_DEVCTL_VBUS; DBG(1, "VBUS %d\n", warn >> MGC_S_DEVCTL_VBUS); } msleep(1000); maxdelay--; } while (maxdelay > 0); /* in OTG mode, another host might be connected */ if (devctl & MGC_M_DEVCTL_VBUS) DBG(1, "VBUS off timeout (devctl %02x)\n", devctl); } phy_off(); return 0; }