// SPDX-License-Identifier: GPL-2.0 /* * TUSB6010 USB 2.0 OTG Dual Role controller * * Copyright (C) 2006 Nokia Corporation * Tony Lindgren * * Notes: * - Driver assumes that interface to external host (main CPU) is * configured for NOR FLASH interface instead of VLYNQ serial * interface. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "musb_core.h" struct tusb6010_glue { struct device *dev; struct platform_device *musb; struct platform_device *phy; struct gpio_desc *enable; struct gpio_desc *intpin; }; static void tusb_musb_set_vbus(struct musb *musb, int is_on); #define TUSB_REV_MAJOR(reg_val) ((reg_val >> 4) & 0xf) #define TUSB_REV_MINOR(reg_val) (reg_val & 0xf) /* * Checks the revision. We need to use the DMA register as 3.0 does not * have correct versions for TUSB_PRCM_REV or TUSB_INT_CTRL_REV. */ static u8 tusb_get_revision(struct musb *musb) { void __iomem *tbase = musb->ctrl_base; u32 die_id; u8 rev; rev = musb_readl(tbase, TUSB_DMA_CTRL_REV) & 0xff; if (TUSB_REV_MAJOR(rev) == 3) { die_id = TUSB_DIDR1_HI_CHIP_REV(musb_readl(tbase, TUSB_DIDR1_HI)); if (die_id >= TUSB_DIDR1_HI_REV_31) rev |= 1; } return rev; } static void tusb_print_revision(struct musb *musb) { void __iomem *tbase = musb->ctrl_base; u8 rev; rev = musb->tusb_revision; pr_info("tusb: %s%i.%i %s%i.%i %s%i.%i %s%i.%i %s%i %s%i.%i\n", "prcm", TUSB_REV_MAJOR(musb_readl(tbase, TUSB_PRCM_REV)), TUSB_REV_MINOR(musb_readl(tbase, TUSB_PRCM_REV)), "int", TUSB_REV_MAJOR(musb_readl(tbase, TUSB_INT_CTRL_REV)), TUSB_REV_MINOR(musb_readl(tbase, TUSB_INT_CTRL_REV)), "gpio", TUSB_REV_MAJOR(musb_readl(tbase, TUSB_GPIO_REV)), TUSB_REV_MINOR(musb_readl(tbase, TUSB_GPIO_REV)), "dma", TUSB_REV_MAJOR(musb_readl(tbase, TUSB_DMA_CTRL_REV)), TUSB_REV_MINOR(musb_readl(tbase, TUSB_DMA_CTRL_REV)), "dieid", TUSB_DIDR1_HI_CHIP_REV(musb_readl(tbase, TUSB_DIDR1_HI)), "rev", TUSB_REV_MAJOR(rev), TUSB_REV_MINOR(rev)); } #define WBUS_QUIRK_MASK (TUSB_PHY_OTG_CTRL_TESTM2 | TUSB_PHY_OTG_CTRL_TESTM1 \ | TUSB_PHY_OTG_CTRL_TESTM0) /* * Workaround for spontaneous WBUS wake-up issue #2 for tusb3.0. * Disables power detection in PHY for the duration of idle. */ static void tusb_wbus_quirk(struct musb *musb, int enabled) { void __iomem *tbase = musb->ctrl_base; static u32 phy_otg_ctrl, phy_otg_ena; u32 tmp; if (enabled) { phy_otg_ctrl = musb_readl(tbase, TUSB_PHY_OTG_CTRL); phy_otg_ena = musb_readl(tbase, TUSB_PHY_OTG_CTRL_ENABLE); tmp = TUSB_PHY_OTG_CTRL_WRPROTECT | phy_otg_ena | WBUS_QUIRK_MASK; musb_writel(tbase, TUSB_PHY_OTG_CTRL, tmp); tmp = phy_otg_ena & ~WBUS_QUIRK_MASK; tmp |= TUSB_PHY_OTG_CTRL_WRPROTECT | TUSB_PHY_OTG_CTRL_TESTM2; musb_writel(tbase, TUSB_PHY_OTG_CTRL_ENABLE, tmp); dev_dbg(musb->controller, "Enabled tusb wbus quirk ctrl %08x ena %08x\n", musb_readl(tbase, TUSB_PHY_OTG_CTRL), musb_readl(tbase, TUSB_PHY_OTG_CTRL_ENABLE)); } else if (musb_readl(tbase, TUSB_PHY_OTG_CTRL_ENABLE) & TUSB_PHY_OTG_CTRL_TESTM2) { tmp = TUSB_PHY_OTG_CTRL_WRPROTECT | phy_otg_ctrl; musb_writel(tbase, TUSB_PHY_OTG_CTRL, tmp); tmp = TUSB_PHY_OTG_CTRL_WRPROTECT | phy_otg_ena; musb_writel(tbase, TUSB_PHY_OTG_CTRL_ENABLE, tmp); dev_dbg(musb->controller, "Disabled tusb wbus quirk ctrl %08x ena %08x\n", musb_readl(tbase, TUSB_PHY_OTG_CTRL), musb_readl(tbase, TUSB_PHY_OTG_CTRL_ENABLE)); phy_otg_ctrl = 0; phy_otg_ena = 0; } } static u32 tusb_fifo_offset(u8 epnum) { return 0x200 + (epnum * 0x20); } static u32 tusb_ep_offset(u8 epnum, u16 offset) { return 0x10 + offset; } /* TUSB mapping: "flat" plus ep0 special cases */ static void tusb_ep_select(void __iomem *mbase, u8 epnum) { musb_writeb(mbase, MUSB_INDEX, epnum); } /* * TUSB6010 doesn't allow 8-bit access; 16-bit access is the minimum. */ static u8 tusb_readb(void __iomem *addr, u32 offset) { u16 tmp; u8 val; tmp = __raw_readw(addr + (offset & ~1)); if (offset & 1) val = (tmp >> 8); else val = tmp & 0xff; return val; } static void tusb_writeb(void __iomem *addr, u32 offset, u8 data) { u16 tmp; tmp = __raw_readw(addr + (offset & ~1)); if (offset & 1) tmp = (data << 8) | (tmp & 0xff); else tmp = (tmp & 0xff00) | data; __raw_writew(tmp, addr + (offset & ~1)); } /* * TUSB 6010 may use a parallel bus that doesn't support byte ops; * so both loading and unloading FIFOs need explicit byte counts. */ static inline void tusb_fifo_write_unaligned(void __iomem *fifo, const u8 *buf, u16 len) { u32 val; int i; if (len > 4) { for (i = 0; i < (len >> 2); i++) { memcpy(&val, buf, 4); musb_writel(fifo, 0, val); buf += 4; } len %= 4; } if (len > 0) { /* Write the rest 1 - 3 bytes to FIFO */ val = 0; memcpy(&val, buf, len); musb_writel(fifo, 0, val); } } static inline void tusb_fifo_read_unaligned(void __iomem *fifo, void *buf, u16 len) { u32 val; int i; if (len > 4) { for (i = 0; i < (len >> 2); i++) { val = musb_readl(fifo, 0); memcpy(buf, &val, 4); buf += 4; } len %= 4; } if (len > 0) { /* Read the rest 1 - 3 bytes from FIFO */ val = musb_readl(fifo, 0); memcpy(buf, &val, len); } } static void tusb_write_fifo(struct musb_hw_ep *hw_ep, u16 len, const u8 *buf) { struct musb *musb = hw_ep->musb; void __iomem *ep_conf = hw_ep->conf; void __iomem *fifo = hw_ep->fifo; u8 epnum = hw_ep->epnum; prefetch(buf); dev_dbg(musb->controller, "%cX ep%d fifo %p count %d buf %p\n", 'T', epnum, fifo, len, buf); if (epnum) musb_writel(ep_conf, TUSB_EP_TX_OFFSET, TUSB_EP_CONFIG_XFR_SIZE(len)); else musb_writel(ep_conf, 0, TUSB_EP0_CONFIG_DIR_TX | TUSB_EP0_CONFIG_XFR_SIZE(len)); if (likely((0x01 & (unsigned long) buf) == 0)) { /* Best case is 32bit-aligned destination address */ if ((0x02 & (unsigned long) buf) == 0) { if (len >= 4) { iowrite32_rep(fifo, buf, len >> 2); buf += (len & ~0x03); len &= 0x03; } } else { if (len >= 2) { u32 val; int i; /* Cannot use writesw, fifo is 32-bit */ for (i = 0; i < (len >> 2); i++) { val = (u32)(*(u16 *)buf); buf += 2; val |= (*(u16 *)buf) << 16; buf += 2; musb_writel(fifo, 0, val); } len &= 0x03; } } } if (len > 0) tusb_fifo_write_unaligned(fifo, buf, len); } static void tusb_read_fifo(struct musb_hw_ep *hw_ep, u16 len, u8 *buf) { struct musb *musb = hw_ep->musb; void __iomem *ep_conf = hw_ep->conf; void __iomem *fifo = hw_ep->fifo; u8 epnum = hw_ep->epnum; dev_dbg(musb->controller, "%cX ep%d fifo %p count %d buf %p\n", 'R', epnum, fifo, len, buf); if (epnum) musb_writel(ep_conf, TUSB_EP_RX_OFFSET, TUSB_EP_CONFIG_XFR_SIZE(len)); else musb_writel(ep_conf, 0, TUSB_EP0_CONFIG_XFR_SIZE(len)); if (likely((0x01 & (unsigned long) buf) == 0)) { /* Best case is 32bit-aligned destination address */ if ((0x02 & (unsigned long) buf) == 0) { if (len >= 4) { ioread32_rep(fifo, buf, len >> 2); buf += (len & ~0x03); len &= 0x03; } } else { if (len >= 2) { u32 val; int i; /* Cannot use readsw, fifo is 32-bit */ for (i = 0; i < (len >> 2); i++) { val = musb_readl(fifo, 0); *(u16 *)buf = (u16)(val & 0xffff); buf += 2; *(u16 *)buf = (u16)(val >> 16); buf += 2; } len &= 0x03; } } } if (len > 0) tusb_fifo_read_unaligned(fifo, buf, len); } static struct musb *the_musb; /* This is used by gadget drivers, and OTG transceiver logic, allowing * at most mA current to be drawn from VBUS during a Default-B session * (that is, while VBUS exceeds 4.4V). In Default-A (including pure host * mode), or low power Default-B sessions, something else supplies power. * Caller must take care of locking. */ static int tusb_draw_power(struct usb_phy *x, unsigned mA) { struct musb *musb = the_musb; void __iomem *tbase = musb->ctrl_base; u32 reg; /* tps65030 seems to consume max 100mA, with maybe 60mA available * (measured on one board) for things other than tps and tusb. * * Boards sharing the CPU clock with CLKIN will need to prevent * certain idle sleep states while the USB link is active. * * REVISIT we could use VBUS to supply only _one_ of { 1.5V, 3.3V }. * The actual current usage would be very board-specific. For now, * it's simpler to just use an aggregate (also board-specific). */ if (x->otg->default_a || mA < (musb->min_power << 1)) mA = 0; reg = musb_readl(tbase, TUSB_PRCM_MNGMT); if (mA) { musb->is_bus_powered = 1; reg |= TUSB_PRCM_MNGMT_15_SW_EN | TUSB_PRCM_MNGMT_33_SW_EN; } else { musb->is_bus_powered = 0; reg &= ~(TUSB_PRCM_MNGMT_15_SW_EN | TUSB_PRCM_MNGMT_33_SW_EN); } musb_writel(tbase, TUSB_PRCM_MNGMT, reg); dev_dbg(musb->controller, "draw max %d mA VBUS\n", mA); return 0; } /* workaround for issue 13: change clock during chip idle * (to be fixed in rev3 silicon) ... symptoms include disconnect * or looping suspend/resume cycles */ static void tusb_set_clock_source(struct musb *musb, unsigned mode) { void __iomem *tbase = musb->ctrl_base; u32 reg; reg = musb_readl(tbase, TUSB_PRCM_CONF); reg &= ~TUSB_PRCM_CONF_SYS_CLKSEL(0x3); /* 0 = refclk (clkin, XI) * 1 = PHY 60 MHz (internal PLL) * 2 = not supported * 3 = what? */ if (mode > 0) reg |= TUSB_PRCM_CONF_SYS_CLKSEL(mode & 0x3); musb_writel(tbase, TUSB_PRCM_CONF, reg); /* FIXME tusb6010_platform_retime(mode == 0); */ } /* * Idle TUSB6010 until next wake-up event; NOR access always wakes. * Other code ensures that we idle unless we're connected _and_ the * USB link is not suspended ... and tells us the relevant wakeup * events. SW_EN for voltage is handled separately. */ static void tusb_allow_idle(struct musb *musb, u32 wakeup_enables) { void __iomem *tbase = musb->ctrl_base; u32 reg; if ((wakeup_enables & TUSB_PRCM_WBUS) && (musb->tusb_revision == TUSB_REV_30)) tusb_wbus_quirk(musb, 1); tusb_set_clock_source(musb, 0); wakeup_enables |= TUSB_PRCM_WNORCS; musb_writel(tbase, TUSB_PRCM_WAKEUP_MASK, ~wakeup_enables); /* REVISIT writeup of WID implies that if WID set and ID is grounded, * TUSB_PHY_OTG_CTRL.TUSB_PHY_OTG_CTRL_OTG_ID_PULLUP must be cleared. * Presumably that's mostly to save power, hence WID is immaterial ... */ reg = musb_readl(tbase, TUSB_PRCM_MNGMT); /* issue 4: when driving vbus, use hipower (vbus_det) comparator */ if (is_host_active(musb)) { reg |= TUSB_PRCM_MNGMT_OTG_VBUS_DET_EN; reg &= ~TUSB_PRCM_MNGMT_OTG_SESS_END_EN; } else { reg |= TUSB_PRCM_MNGMT_OTG_SESS_END_EN; reg &= ~TUSB_PRCM_MNGMT_OTG_VBUS_DET_EN; } reg |= TUSB_PRCM_MNGMT_PM_IDLE | TUSB_PRCM_MNGMT_DEV_IDLE; musb_writel(tbase, TUSB_PRCM_MNGMT, reg); dev_dbg(musb->controller, "idle, wake on %02x\n", wakeup_enables); } /* * Updates cable VBUS status. Caller must take care of locking. */ static int tusb_musb_vbus_status(struct musb *musb) { void __iomem *tbase = musb->ctrl_base; u32 otg_stat, prcm_mngmt; int ret = 0; otg_stat = musb_readl(tbase, TUSB_DEV_OTG_STAT); prcm_mngmt = musb_readl(tbase, TUSB_PRCM_MNGMT); /* Temporarily enable VBUS detection if it was disabled for * suspend mode. Unless it's enabled otg_stat and devctl will * not show correct VBUS state. */ if (!(prcm_mngmt & TUSB_PRCM_MNGMT_OTG_VBUS_DET_EN)) { u32 tmp = prcm_mngmt; tmp |= TUSB_PRCM_MNGMT_OTG_VBUS_DET_EN; musb_writel(tbase, TUSB_PRCM_MNGMT, tmp); otg_stat = musb_readl(tbase, TUSB_DEV_OTG_STAT); musb_writel(tbase, TUSB_PRCM_MNGMT, prcm_mngmt); } if (otg_stat & TUSB_DEV_OTG_STAT_VBUS_VALID) ret = 1; return ret; } static void musb_do_idle(struct timer_list *t) { struct musb *musb = from_timer(musb, t, dev_timer); unsigned long flags; spin_lock_irqsave(&musb->lock, flags); switch (musb->xceiv->otg->state) { case OTG_STATE_A_WAIT_BCON: if ((musb->a_wait_bcon != 0) && (musb->idle_timeout == 0 || time_after(jiffies, musb->idle_timeout))) { dev_dbg(musb->controller, "Nothing connected %s, turning off VBUS\n", usb_otg_state_string(musb->xceiv->otg->state)); } fallthrough; case OTG_STATE_A_IDLE: tusb_musb_set_vbus(musb, 0); break; default: break; } if (!musb->is_active) { u32 wakeups; /* wait until hub_wq handles port change status */ if (is_host_active(musb) && (musb->port1_status >> 16)) goto done; if (!musb->gadget_driver) { wakeups = 0; } else { wakeups = TUSB_PRCM_WHOSTDISCON | TUSB_PRCM_WBUS | TUSB_PRCM_WVBUS; wakeups |= TUSB_PRCM_WID; } tusb_allow_idle(musb, wakeups); } done: spin_unlock_irqrestore(&musb->lock, flags); } /* * Maybe put TUSB6010 into idle mode depending on USB link status, * like "disconnected" or "suspended". We'll be woken out of it by * connect, resume, or disconnect. * * Needs to be called as the last function everywhere where there is * register access to TUSB6010 because of NOR flash wake-up. * Caller should own controller spinlock. * * Delay because peripheral enables D+ pullup 3msec after SE0, and * we don't want to treat that full speed J as a wakeup event. * ... peripherals must draw only suspend current after 10 msec. */ static void tusb_musb_try_idle(struct musb *musb, unsigned long timeout) { unsigned long default_timeout = jiffies + msecs_to_jiffies(3); static unsigned long last_timer; if (timeout == 0) timeout = default_timeout; /* Never idle if active, or when VBUS timeout is not set as host */ if (musb->is_active || ((musb->a_wait_bcon == 0) && (musb->xceiv->otg->state == OTG_STATE_A_WAIT_BCON))) { dev_dbg(musb->controller, "%s active, deleting timer\n", usb_otg_state_string(musb->xceiv->otg->state)); del_timer(&musb->dev_timer); last_timer = jiffies; return; } if (time_after(last_timer, timeout)) { if (!timer_pending(&musb->dev_timer)) last_timer = timeout; else { dev_dbg(musb->controller, "Longer idle timer already pending, ignoring\n"); return; } } last_timer = timeout; dev_dbg(musb->controller, "%s inactive, for idle timer for %lu ms\n", usb_otg_state_string(musb->xceiv->otg->state), (unsigned long)jiffies_to_msecs(timeout - jiffies)); mod_timer(&musb->dev_timer, timeout); } /* ticks of 60 MHz clock */ #define DEVCLOCK 60000000 #define OTG_TIMER_MS(msecs) ((msecs) \ ? (TUSB_DEV_OTG_TIMER_VAL((DEVCLOCK/1000)*(msecs)) \ | TUSB_DEV_OTG_TIMER_ENABLE) \ : 0) static void tusb_musb_set_vbus(struct musb *musb, int is_on) { void __iomem *tbase = musb->ctrl_base; u32 conf, prcm, timer; u8 devctl; struct usb_otg *otg = musb->xceiv->otg; /* HDRC controls CPEN, but beware current surges during device * connect. They can trigger transient overcurrent conditions * that must be ignored. */ prcm = musb_readl(tbase, TUSB_PRCM_MNGMT); conf = musb_readl(tbase, TUSB_DEV_CONF); devctl = musb_readb(musb->mregs, MUSB_DEVCTL); if (is_on) { timer = OTG_TIMER_MS(OTG_TIME_A_WAIT_VRISE); otg->default_a = 1; musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE; devctl |= MUSB_DEVCTL_SESSION; conf |= TUSB_DEV_CONF_USB_HOST_MODE; MUSB_HST_MODE(musb); } else { u32 otg_stat; timer = 0; /* If ID pin is grounded, we want to be a_idle */ otg_stat = musb_readl(tbase, TUSB_DEV_OTG_STAT); if (!(otg_stat & TUSB_DEV_OTG_STAT_ID_STATUS)) { switch (musb->xceiv->otg->state) { case OTG_STATE_A_WAIT_VRISE: case OTG_STATE_A_WAIT_BCON: musb->xceiv->otg->state = OTG_STATE_A_WAIT_VFALL; break; case OTG_STATE_A_WAIT_VFALL: musb->xceiv->otg->state = OTG_STATE_A_IDLE; break; default: musb->xceiv->otg->state = OTG_STATE_A_IDLE; } musb->is_active = 0; otg->default_a = 1; MUSB_HST_MODE(musb); } else { musb->is_active = 0; otg->default_a = 0; musb->xceiv->otg->state = OTG_STATE_B_IDLE; MUSB_DEV_MODE(musb); } devctl &= ~MUSB_DEVCTL_SESSION; conf &= ~TUSB_DEV_CONF_USB_HOST_MODE; } prcm &= ~(TUSB_PRCM_MNGMT_15_SW_EN | TUSB_PRCM_MNGMT_33_SW_EN); musb_writel(tbase, TUSB_PRCM_MNGMT, prcm); musb_writel(tbase, TUSB_DEV_OTG_TIMER, timer); musb_writel(tbase, TUSB_DEV_CONF, conf); musb_writeb(musb->mregs, MUSB_DEVCTL, devctl); dev_dbg(musb->controller, "VBUS %s, devctl %02x otg %3x conf %08x prcm %08x\n", usb_otg_state_string(musb->xceiv->otg->state), musb_readb(musb->mregs, MUSB_DEVCTL), musb_readl(tbase, TUSB_DEV_OTG_STAT), conf, prcm); } /* * Sets the mode to OTG, peripheral or host by changing the ID detection. * Caller must take care of locking. * * Note that if a mini-A cable is plugged in the ID line will stay down as * the weak ID pull-up is not able to pull the ID up. */ static int tusb_musb_set_mode(struct musb *musb, u8 musb_mode) { void __iomem *tbase = musb->ctrl_base; u32 otg_stat, phy_otg_ctrl, phy_otg_ena, dev_conf; otg_stat = musb_readl(tbase, TUSB_DEV_OTG_STAT); phy_otg_ctrl = musb_readl(tbase, TUSB_PHY_OTG_CTRL); phy_otg_ena = musb_readl(tbase, TUSB_PHY_OTG_CTRL_ENABLE); dev_conf = musb_readl(tbase, TUSB_DEV_CONF); switch (musb_mode) { case MUSB_HOST: /* Disable PHY ID detect, ground ID */ phy_otg_ctrl &= ~TUSB_PHY_OTG_CTRL_OTG_ID_PULLUP; phy_otg_ena |= TUSB_PHY_OTG_CTRL_OTG_ID_PULLUP; dev_conf |= TUSB_DEV_CONF_ID_SEL; dev_conf &= ~TUSB_DEV_CONF_SOFT_ID; break; case MUSB_PERIPHERAL: /* Disable PHY ID detect, keep ID pull-up on */ phy_otg_ctrl |= TUSB_PHY_OTG_CTRL_OTG_ID_PULLUP; phy_otg_ena |= TUSB_PHY_OTG_CTRL_OTG_ID_PULLUP; dev_conf |= (TUSB_DEV_CONF_ID_SEL | TUSB_DEV_CONF_SOFT_ID); break; case MUSB_OTG: /* Use PHY ID detection */ phy_otg_ctrl |= TUSB_PHY_OTG_CTRL_OTG_ID_PULLUP; phy_otg_ena |= TUSB_PHY_OTG_CTRL_OTG_ID_PULLUP; dev_conf &= ~(TUSB_DEV_CONF_ID_SEL | TUSB_DEV_CONF_SOFT_ID); break; default: dev_dbg(musb->controller, "Trying to set mode %i\n", musb_mode); return -EINVAL; } musb_writel(tbase, TUSB_PHY_OTG_CTRL, TUSB_PHY_OTG_CTRL_WRPROTECT | phy_otg_ctrl); musb_writel(tbase, TUSB_PHY_OTG_CTRL_ENABLE, TUSB_PHY_OTG_CTRL_WRPROTECT | phy_otg_ena); musb_writel(tbase, TUSB_DEV_CONF, dev_conf); otg_stat = musb_readl(tbase, TUSB_DEV_OTG_STAT); if ((musb_mode == MUSB_PERIPHERAL) && !(otg_stat & TUSB_DEV_OTG_STAT_ID_STATUS)) INFO("Cannot be peripheral with mini-A cable " "otg_stat: %08x\n", otg_stat); return 0; } static inline unsigned long tusb_otg_ints(struct musb *musb, u32 int_src, void __iomem *tbase) { u32 otg_stat = musb_readl(tbase, TUSB_DEV_OTG_STAT); unsigned long idle_timeout = 0; struct usb_otg *otg = musb->xceiv->otg; /* ID pin */ if ((int_src & TUSB_INT_SRC_ID_STATUS_CHNG)) { int default_a; default_a = !(otg_stat & TUSB_DEV_OTG_STAT_ID_STATUS); dev_dbg(musb->controller, "Default-%c\n", default_a ? 'A' : 'B'); otg->default_a = default_a; tusb_musb_set_vbus(musb, default_a); /* Don't allow idling immediately */ if (default_a) idle_timeout = jiffies + (HZ * 3); } /* VBUS state change */ if (int_src & TUSB_INT_SRC_VBUS_SENSE_CHNG) { /* B-dev state machine: no vbus ~= disconnect */ if (!otg->default_a) { /* ? musb_root_disconnect(musb); */ musb->port1_status &= ~(USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE | USB_PORT_STAT_LOW_SPEED | USB_PORT_STAT_HIGH_SPEED | USB_PORT_STAT_TEST ); if (otg_stat & TUSB_DEV_OTG_STAT_SESS_END) { dev_dbg(musb->controller, "Forcing disconnect (no interrupt)\n"); if (musb->xceiv->otg->state != OTG_STATE_B_IDLE) { /* INTR_DISCONNECT can hide... */ musb->xceiv->otg->state = OTG_STATE_B_IDLE; musb->int_usb |= MUSB_INTR_DISCONNECT; } musb->is_active = 0; } dev_dbg(musb->controller, "vbus change, %s, otg %03x\n", usb_otg_state_string(musb->xceiv->otg->state), otg_stat); idle_timeout = jiffies + (1 * HZ); schedule_delayed_work(&musb->irq_work, 0); } else /* A-dev state machine */ { dev_dbg(musb->controller, "vbus change, %s, otg %03x\n", usb_otg_state_string(musb->xceiv->otg->state), otg_stat); switch (musb->xceiv->otg->state) { case OTG_STATE_A_IDLE: dev_dbg(musb->controller, "Got SRP, turning on VBUS\n"); musb_platform_set_vbus(musb, 1); /* CONNECT can wake if a_wait_bcon is set */ if (musb->a_wait_bcon != 0) musb->is_active = 0; else musb->is_active = 1; /* * OPT FS A TD.4.6 needs few seconds for * A_WAIT_VRISE */ idle_timeout = jiffies + (2 * HZ); break; case OTG_STATE_A_WAIT_VRISE: /* ignore; A-session-valid < VBUS_VALID/2, * we monitor this with the timer */ break; case OTG_STATE_A_WAIT_VFALL: /* REVISIT this irq triggers during short * spikes caused by enumeration ... */ if (musb->vbuserr_retry) { musb->vbuserr_retry--; tusb_musb_set_vbus(musb, 1); } else { musb->vbuserr_retry = VBUSERR_RETRY_COUNT; tusb_musb_set_vbus(musb, 0); } break; default: break; } } } /* OTG timer expiration */ if (int_src & TUSB_INT_SRC_OTG_TIMEOUT) { u8 devctl; dev_dbg(musb->controller, "%s timer, %03x\n", usb_otg_state_string(musb->xceiv->otg->state), otg_stat); switch (musb->xceiv->otg->state) { case OTG_STATE_A_WAIT_VRISE: /* VBUS has probably been valid for a while now, * but may well have bounced out of range a bit */ devctl = musb_readb(musb->mregs, MUSB_DEVCTL); if (otg_stat & TUSB_DEV_OTG_STAT_VBUS_VALID) { if ((devctl & MUSB_DEVCTL_VBUS) != MUSB_DEVCTL_VBUS) { dev_dbg(musb->controller, "devctl %02x\n", devctl); break; } musb->xceiv->otg->state = OTG_STATE_A_WAIT_BCON; musb->is_active = 0; idle_timeout = jiffies + msecs_to_jiffies(musb->a_wait_bcon); } else { /* REVISIT report overcurrent to hub? */ ERR("vbus too slow, devctl %02x\n", devctl); tusb_musb_set_vbus(musb, 0); } break; case OTG_STATE_A_WAIT_BCON: if (musb->a_wait_bcon != 0) idle_timeout = jiffies + msecs_to_jiffies(musb->a_wait_bcon); break; case OTG_STATE_A_SUSPEND: break; case OTG_STATE_B_WAIT_ACON: break; default: break; } } schedule_delayed_work(&musb->irq_work, 0); return idle_timeout; } static irqreturn_t tusb_musb_interrupt(int irq, void *__hci) { struct musb *musb = __hci; void __iomem *tbase = musb->ctrl_base; unsigned long flags, idle_timeout = 0; u32 int_mask, int_src; spin_lock_irqsave(&musb->lock, flags); /* Mask all interrupts to allow using both edge and level GPIO irq */ int_mask = musb_readl(tbase, TUSB_INT_MASK); musb_writel(tbase, TUSB_INT_MASK, ~TUSB_INT_MASK_RESERVED_BITS); int_src = musb_readl(tbase, TUSB_INT_SRC) & ~TUSB_INT_SRC_RESERVED_BITS; dev_dbg(musb->controller, "TUSB IRQ %08x\n", int_src); musb->int_usb = (u8) int_src; /* Acknowledge wake-up source interrupts */ if (int_src & TUSB_INT_SRC_DEV_WAKEUP) { u32 reg; u32 i; if (musb->tusb_revision == TUSB_REV_30) tusb_wbus_quirk(musb, 0); /* there are issues re-locking the PLL on wakeup ... */ /* work around issue 8 */ for (i = 0xf7f7f7; i > 0xf7f7f7 - 1000; i--) { musb_writel(tbase, TUSB_SCRATCH_PAD, 0); musb_writel(tbase, TUSB_SCRATCH_PAD, i); reg = musb_readl(tbase, TUSB_SCRATCH_PAD); if (reg == i) break; dev_dbg(musb->controller, "TUSB NOR not ready\n"); } /* work around issue 13 (2nd half) */ tusb_set_clock_source(musb, 1); reg = musb_readl(tbase, TUSB_PRCM_WAKEUP_SOURCE); musb_writel(tbase, TUSB_PRCM_WAKEUP_CLEAR, reg); if (reg & ~TUSB_PRCM_WNORCS) { musb->is_active = 1; schedule_delayed_work(&musb->irq_work, 0); } dev_dbg(musb->controller, "wake %sactive %02x\n", musb->is_active ? "" : "in", reg); /* REVISIT host side TUSB_PRCM_WHOSTDISCON, TUSB_PRCM_WBUS */ } if (int_src & TUSB_INT_SRC_USB_IP_CONN) del_timer(&musb->dev_timer); /* OTG state change reports (annoyingly) not issued by Mentor core */ if (int_src & (TUSB_INT_SRC_VBUS_SENSE_CHNG | TUSB_INT_SRC_OTG_TIMEOUT | TUSB_INT_SRC_ID_STATUS_CHNG)) idle_timeout = tusb_otg_ints(musb, int_src, tbase); /* * Just clear the DMA interrupt if it comes as the completion for both * TX and RX is handled by the DMA callback in tusb6010_omap */ if ((int_src & TUSB_INT_SRC_TXRX_DMA_DONE)) { u32 dma_src = musb_readl(tbase, TUSB_DMA_INT_SRC); dev_dbg(musb->controller, "DMA IRQ %08x\n", dma_src); musb_writel(tbase, TUSB_DMA_INT_CLEAR, dma_src); } /* EP interrupts. In OCP mode tusb6010 mirrors the MUSB interrupts */ if (int_src & (TUSB_INT_SRC_USB_IP_TX | TUSB_INT_SRC_USB_IP_RX)) { u32 musb_src = musb_readl(tbase, TUSB_USBIP_INT_SRC); musb_writel(tbase, TUSB_USBIP_INT_CLEAR, musb_src); musb->int_rx = (((musb_src >> 16) & 0xffff) << 1); musb->int_tx = (musb_src & 0xffff); } else { musb->int_rx = 0; musb->int_tx = 0; } if (int_src & (TUSB_INT_SRC_USB_IP_TX | TUSB_INT_SRC_USB_IP_RX | 0xff)) musb_interrupt(musb); /* Acknowledge TUSB interrupts. Clear only non-reserved bits */ musb_writel(tbase, TUSB_INT_SRC_CLEAR, int_src & ~TUSB_INT_MASK_RESERVED_BITS); tusb_musb_try_idle(musb, idle_timeout); musb_writel(tbase, TUSB_INT_MASK, int_mask); spin_unlock_irqrestore(&musb->lock, flags); return IRQ_HANDLED; } static int dma_off; /* * Enables TUSB6010. Caller must take care of locking. * REVISIT: * - Check what is unnecessary in MGC_HdrcStart() */ static void tusb_musb_enable(struct musb *musb) { void __iomem *tbase = musb->ctrl_base; /* Setup TUSB6010 main interrupt mask. Enable all interrupts except SOF. * REVISIT: Enable and deal with TUSB_INT_SRC_USB_IP_SOF */ musb_writel(tbase, TUSB_INT_MASK, TUSB_INT_SRC_USB_IP_SOF); /* Setup TUSB interrupt, disable DMA and GPIO interrupts */ musb_writel(tbase, TUSB_USBIP_INT_MASK, 0); musb_writel(tbase, TUSB_DMA_INT_MASK, 0x7fffffff); musb_writel(tbase, TUSB_GPIO_INT_MASK, 0x1ff); /* Clear all subsystem interrups */ musb_writel(tbase, TUSB_USBIP_INT_CLEAR, 0x7fffffff); musb_writel(tbase, TUSB_DMA_INT_CLEAR, 0x7fffffff); musb_writel(tbase, TUSB_GPIO_INT_CLEAR, 0x1ff); /* Acknowledge pending interrupt(s) */ musb_writel(tbase, TUSB_INT_SRC_CLEAR, ~TUSB_INT_MASK_RESERVED_BITS); /* Only 0 clock cycles for minimum interrupt de-assertion time and * interrupt polarity active low seems to work reliably here */ musb_writel(tbase, TUSB_INT_CTRL_CONF, TUSB_INT_CTRL_CONF_INT_RELCYC(0)); irq_set_irq_type(musb->nIrq, IRQ_TYPE_LEVEL_LOW); /* maybe force into the Default-A OTG state machine */ if (!(musb_readl(tbase, TUSB_DEV_OTG_STAT) & TUSB_DEV_OTG_STAT_ID_STATUS)) musb_writel(tbase, TUSB_INT_SRC_SET, TUSB_INT_SRC_ID_STATUS_CHNG); if (is_dma_capable() && dma_off) printk(KERN_WARNING "%s %s: dma not reactivated\n", __FILE__, __func__); else dma_off = 1; } /* * Disables TUSB6010. Caller must take care of locking. */ static void tusb_musb_disable(struct musb *musb) { void __iomem *tbase = musb->ctrl_base; /* FIXME stop DMA, IRQs, timers, ... */ /* disable all IRQs */ musb_writel(tbase, TUSB_INT_MASK, ~TUSB_INT_MASK_RESERVED_BITS); musb_writel(tbase, TUSB_USBIP_INT_MASK, 0x7fffffff); musb_writel(tbase, TUSB_DMA_INT_MASK, 0x7fffffff); musb_writel(tbase, TUSB_GPIO_INT_MASK, 0x1ff); del_timer(&musb->dev_timer); if (is_dma_capable() && !dma_off) { printk(KERN_WARNING "%s %s: dma still active\n", __FILE__, __func__); dma_off = 1; } } /* * Sets up TUSB6010 CPU interface specific signals and registers * Note: Settings optimized for OMAP24xx */ static void tusb_setup_cpu_interface(struct musb *musb) { void __iomem *tbase = musb->ctrl_base; /* * Disable GPIO[5:0] pullups (used as output DMA requests) * Don't disable GPIO[7:6] as they are needed for wake-up. */ musb_writel(tbase, TUSB_PULLUP_1_CTRL, 0x0000003F); /* Disable all pullups on NOR IF, DMAREQ0 and DMAREQ1 */ musb_writel(tbase, TUSB_PULLUP_2_CTRL, 0x01FFFFFF); /* Turn GPIO[5:0] to DMAREQ[5:0] signals */ musb_writel(tbase, TUSB_GPIO_CONF, TUSB_GPIO_CONF_DMAREQ(0x3f)); /* Burst size 16x16 bits, all six DMA requests enabled, DMA request * de-assertion time 2 system clocks p 62 */ musb_writel(tbase, TUSB_DMA_REQ_CONF, TUSB_DMA_REQ_CONF_BURST_SIZE(2) | TUSB_DMA_REQ_CONF_DMA_REQ_EN(0x3f) | TUSB_DMA_REQ_CONF_DMA_REQ_ASSER(2)); /* Set 0 wait count for synchronous burst access */ musb_writel(tbase, TUSB_WAIT_COUNT, 1); } static int tusb_musb_start(struct musb *musb) { struct tusb6010_glue *glue = dev_get_drvdata(musb->controller->parent); void __iomem *tbase = musb->ctrl_base; unsigned long flags; u32 reg; int ret; /* * Enable or disable power to TUSB6010. When enabling, turn on 3.3 V and * 1.5 V voltage regulators of PM companion chip. Companion chip will then * provide then PGOOD signal to TUSB6010 which will release it from reset. */ gpiod_set_value(glue->enable, 1); /* Wait for 100ms until TUSB6010 pulls INT pin down */ ret = read_poll_timeout(gpiod_get_value, reg, !reg, 5000, 100000, true, glue->intpin); if (ret) { pr_err("tusb: Powerup response failed\n"); return ret; } spin_lock_irqsave(&musb->lock, flags); if (musb_readl(tbase, TUSB_PROD_TEST_RESET) != TUSB_PROD_TEST_RESET_VAL) { printk(KERN_ERR "tusb: Unable to detect TUSB6010\n"); goto err; } musb->tusb_revision = tusb_get_revision(musb); tusb_print_revision(musb); if (musb->tusb_revision < 2) { printk(KERN_ERR "tusb: Unsupported TUSB6010 revision %i\n", musb->tusb_revision); goto err; } /* The uint bit for "USB non-PDR interrupt enable" has to be 1 when * NOR FLASH interface is used */ musb_writel(tbase, TUSB_VLYNQ_CTRL, 8); /* Select PHY free running 60MHz as a system clock */ tusb_set_clock_source(musb, 1); /* VBus valid timer 1us, disable DFT/Debug and VLYNQ clocks for * power saving, enable VBus detect and session end comparators, * enable IDpullup, enable VBus charging */ musb_writel(tbase, TUSB_PRCM_MNGMT, TUSB_PRCM_MNGMT_VBUS_VALID_TIMER(0xa) | TUSB_PRCM_MNGMT_VBUS_VALID_FLT_EN | TUSB_PRCM_MNGMT_OTG_SESS_END_EN | TUSB_PRCM_MNGMT_OTG_VBUS_DET_EN | TUSB_PRCM_MNGMT_OTG_ID_PULLUP); tusb_setup_cpu_interface(musb); /* simplify: always sense/pullup ID pins, as if in OTG mode */ reg = musb_readl(tbase, TUSB_PHY_OTG_CTRL_ENABLE); reg |= TUSB_PHY_OTG_CTRL_WRPROTECT | TUSB_PHY_OTG_CTRL_OTG_ID_PULLUP; musb_writel(tbase, TUSB_PHY_OTG_CTRL_ENABLE, reg); reg = musb_readl(tbase, TUSB_PHY_OTG_CTRL); reg |= TUSB_PHY_OTG_CTRL_WRPROTECT | TUSB_PHY_OTG_CTRL_OTG_ID_PULLUP; musb_writel(tbase, TUSB_PHY_OTG_CTRL, reg); spin_unlock_irqrestore(&musb->lock, flags); return 0; err: spin_unlock_irqrestore(&musb->lock, flags); gpiod_set_value(glue->enable, 0); msleep(10); return -ENODEV; } static int tusb_musb_init(struct musb *musb) { struct platform_device *pdev; struct resource *mem; void __iomem *sync = NULL; int ret; musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2); if (IS_ERR_OR_NULL(musb->xceiv)) return -EPROBE_DEFER; pdev = to_platform_device(musb->controller); /* dma address for async dma */ mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!mem) { pr_debug("no async dma resource?\n"); ret = -ENODEV; goto done; } musb->async = mem->start; /* dma address for sync dma */ mem = platform_get_resource(pdev, IORESOURCE_MEM, 1); if (!mem) { pr_debug("no sync dma resource?\n"); ret = -ENODEV; goto done; } musb->sync = mem->start; sync = ioremap(mem->start, resource_size(mem)); if (!sync) { pr_debug("ioremap for sync failed\n"); ret = -ENOMEM; goto done; } musb->sync_va = sync; /* Offsets from base: VLYNQ at 0x000, MUSB regs at 0x400, * FIFOs at 0x600, TUSB at 0x800 */ musb->mregs += TUSB_BASE_OFFSET; ret = tusb_musb_start(musb); if (ret) { printk(KERN_ERR "Could not start tusb6010 (%d)\n", ret); goto done; } musb->isr = tusb_musb_interrupt; musb->xceiv->set_power = tusb_draw_power; the_musb = musb; timer_setup(&musb->dev_timer, musb_do_idle, 0); done: if (ret < 0) { if (sync) iounmap(sync); usb_put_phy(musb->xceiv); } return ret; } static int tusb_musb_exit(struct musb *musb) { struct tusb6010_glue *glue = dev_get_drvdata(musb->controller->parent); del_timer_sync(&musb->dev_timer); the_musb = NULL; gpiod_set_value(glue->enable, 0); msleep(10); iounmap(musb->sync_va); usb_put_phy(musb->xceiv); return 0; } static const struct musb_platform_ops tusb_ops = { .quirks = MUSB_DMA_TUSB_OMAP | MUSB_IN_TUSB | MUSB_G_NO_SKB_RESERVE, .init = tusb_musb_init, .exit = tusb_musb_exit, .ep_offset = tusb_ep_offset, .ep_select = tusb_ep_select, .fifo_offset = tusb_fifo_offset, .readb = tusb_readb, .writeb = tusb_writeb, .read_fifo = tusb_read_fifo, .write_fifo = tusb_write_fifo, #ifdef CONFIG_USB_TUSB_OMAP_DMA .dma_init = tusb_dma_controller_create, .dma_exit = tusb_dma_controller_destroy, #endif .enable = tusb_musb_enable, .disable = tusb_musb_disable, .set_mode = tusb_musb_set_mode, .try_idle = tusb_musb_try_idle, .vbus_status = tusb_musb_vbus_status, .set_vbus = tusb_musb_set_vbus, }; static const struct platform_device_info tusb_dev_info = { .name = "musb-hdrc", .id = PLATFORM_DEVID_AUTO, .dma_mask = DMA_BIT_MASK(32), }; static int tusb_probe(struct platform_device *pdev) { struct resource musb_resources[3]; struct musb_hdrc_platform_data *pdata = dev_get_platdata(&pdev->dev); struct platform_device *musb; struct tusb6010_glue *glue; struct platform_device_info pinfo; int ret; glue = devm_kzalloc(&pdev->dev, sizeof(*glue), GFP_KERNEL); if (!glue) return -ENOMEM; glue->dev = &pdev->dev; glue->enable = devm_gpiod_get(glue->dev, "enable", GPIOD_OUT_LOW); if (IS_ERR(glue->enable)) return dev_err_probe(glue->dev, PTR_ERR(glue->enable), "could not obtain power on/off GPIO\n"); glue->intpin = devm_gpiod_get(glue->dev, "int", GPIOD_IN); if (IS_ERR(glue->intpin)) return dev_err_probe(glue->dev, PTR_ERR(glue->intpin), "could not obtain INT GPIO\n"); pdata->platform_ops = &tusb_ops; usb_phy_generic_register(); platform_set_drvdata(pdev, glue); memset(musb_resources, 0x00, sizeof(*musb_resources) * ARRAY_SIZE(musb_resources)); musb_resources[0].name = pdev->resource[0].name; musb_resources[0].start = pdev->resource[0].start; musb_resources[0].end = pdev->resource[0].end; musb_resources[0].flags = pdev->resource[0].flags; musb_resources[1].name = pdev->resource[1].name; musb_resources[1].start = pdev->resource[1].start; musb_resources[1].end = pdev->resource[1].end; musb_resources[1].flags = pdev->resource[1].flags; musb_resources[2] = DEFINE_RES_IRQ_NAMED(gpiod_to_irq(glue->intpin), "mc"); pinfo = tusb_dev_info; pinfo.parent = &pdev->dev; pinfo.res = musb_resources; pinfo.num_res = ARRAY_SIZE(musb_resources); pinfo.data = pdata; pinfo.size_data = sizeof(*pdata); glue->musb = musb = platform_device_register_full(&pinfo); if (IS_ERR(musb)) { ret = PTR_ERR(musb); dev_err(&pdev->dev, "failed to register musb device: %d\n", ret); return ret; } return 0; } static void tusb_remove(struct platform_device *pdev) { struct tusb6010_glue *glue = platform_get_drvdata(pdev); platform_device_unregister(glue->musb); usb_phy_generic_unregister(glue->phy); } static struct platform_driver tusb_driver = { .probe = tusb_probe, .remove = tusb_remove, .driver = { .name = "musb-tusb", }, }; MODULE_DESCRIPTION("TUSB6010 MUSB Glue Layer"); MODULE_AUTHOR("Felipe Balbi "); MODULE_LICENSE("GPL v2"); module_platform_driver(tusb_driver);