// SPDX-License-Identifier: GPL-2.0 /* * Texas Instruments DA8xx/OMAP-L1x "glue layer" * * Copyright (c) 2008-2009 MontaVista Software, Inc. * * Based on the DaVinci "glue layer" code. * Copyright (C) 2005-2006 by Texas Instruments * * DT support * Copyright (c) 2016 Petr Kulhavy * * This file is part of the Inventra Controller Driver for Linux. */ #include #include #include #include #include #include #include #include #include #include "musb_core.h" /* * DA8XX specific definitions */ /* USB 2.0 OTG module registers */ #define DA8XX_USB_REVISION_REG 0x00 #define DA8XX_USB_CTRL_REG 0x04 #define DA8XX_USB_STAT_REG 0x08 #define DA8XX_USB_EMULATION_REG 0x0c #define DA8XX_USB_SRP_FIX_TIME_REG 0x18 #define DA8XX_USB_INTR_SRC_REG 0x20 #define DA8XX_USB_INTR_SRC_SET_REG 0x24 #define DA8XX_USB_INTR_SRC_CLEAR_REG 0x28 #define DA8XX_USB_INTR_MASK_REG 0x2c #define DA8XX_USB_INTR_MASK_SET_REG 0x30 #define DA8XX_USB_INTR_MASK_CLEAR_REG 0x34 #define DA8XX_USB_INTR_SRC_MASKED_REG 0x38 #define DA8XX_USB_END_OF_INTR_REG 0x3c #define DA8XX_USB_GENERIC_RNDIS_EP_SIZE_REG(n) (0x50 + (((n) - 1) << 2)) /* Control register bits */ #define DA8XX_SOFT_RESET_MASK 1 #define DA8XX_USB_TX_EP_MASK 0x1f /* EP0 + 4 Tx EPs */ #define DA8XX_USB_RX_EP_MASK 0x1e /* 4 Rx EPs */ /* USB interrupt register bits */ #define DA8XX_INTR_USB_SHIFT 16 #define DA8XX_INTR_USB_MASK (0x1ff << DA8XX_INTR_USB_SHIFT) /* 8 Mentor */ /* interrupts and DRVVBUS interrupt */ #define DA8XX_INTR_DRVVBUS 0x100 #define DA8XX_INTR_RX_SHIFT 8 #define DA8XX_INTR_RX_MASK (DA8XX_USB_RX_EP_MASK << DA8XX_INTR_RX_SHIFT) #define DA8XX_INTR_TX_SHIFT 0 #define DA8XX_INTR_TX_MASK (DA8XX_USB_TX_EP_MASK << DA8XX_INTR_TX_SHIFT) #define DA8XX_MENTOR_CORE_OFFSET 0x400 struct da8xx_glue { struct device *dev; struct platform_device *musb; struct platform_device *usb_phy; struct clk *clk; struct phy *phy; }; /* * Because we don't set CTRL.UINT, it's "important" to: * - not read/write INTRUSB/INTRUSBE (except during * initial setup, as a workaround); * - use INTSET/INTCLR instead. */ /** * da8xx_musb_enable - enable interrupts */ static void da8xx_musb_enable(struct musb *musb) { void __iomem *reg_base = musb->ctrl_base; u32 mask; /* Workaround: setup IRQs through both register sets. */ mask = ((musb->epmask & DA8XX_USB_TX_EP_MASK) << DA8XX_INTR_TX_SHIFT) | ((musb->epmask & DA8XX_USB_RX_EP_MASK) << DA8XX_INTR_RX_SHIFT) | DA8XX_INTR_USB_MASK; musb_writel(reg_base, DA8XX_USB_INTR_MASK_SET_REG, mask); /* Force the DRVVBUS IRQ so we can start polling for ID change. */ musb_writel(reg_base, DA8XX_USB_INTR_SRC_SET_REG, DA8XX_INTR_DRVVBUS << DA8XX_INTR_USB_SHIFT); } /** * da8xx_musb_disable - disable HDRC and flush interrupts */ static void da8xx_musb_disable(struct musb *musb) { void __iomem *reg_base = musb->ctrl_base; musb_writel(reg_base, DA8XX_USB_INTR_MASK_CLEAR_REG, DA8XX_INTR_USB_MASK | DA8XX_INTR_TX_MASK | DA8XX_INTR_RX_MASK); musb_writel(reg_base, DA8XX_USB_END_OF_INTR_REG, 0); } #define portstate(stmt) stmt static void da8xx_musb_set_vbus(struct musb *musb, int is_on) { WARN_ON(is_on && is_peripheral_active(musb)); } #define POLL_SECONDS 2 static void otg_timer(struct timer_list *t) { struct musb *musb = from_timer(musb, t, dev_timer); 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, usb_otg_state_string(musb->xceiv->otg->state)); spin_lock_irqsave(&musb->lock, flags); switch (musb->xceiv->otg->state) { case OTG_STATE_A_WAIT_BCON: devctl &= ~MUSB_DEVCTL_SESSION; musb_writeb(musb->mregs, MUSB_DEVCTL, devctl); devctl = musb_readb(musb->mregs, MUSB_DEVCTL); if (devctl & MUSB_DEVCTL_BDEVICE) { musb->xceiv->otg->state = OTG_STATE_B_IDLE; MUSB_DEV_MODE(musb); } else { musb->xceiv->otg->state = OTG_STATE_A_IDLE; MUSB_HST_MODE(musb); } break; case OTG_STATE_A_WAIT_VFALL: /* * Wait till VBUS falls below SessionEnd (~0.2 V); 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(&musb->dev_timer, jiffies + POLL_SECONDS * HZ); break; } musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE; musb_writel(musb->ctrl_base, DA8XX_USB_INTR_SRC_SET_REG, MUSB_INTR_VBUSERROR << DA8XX_INTR_USB_SHIFT); break; case OTG_STATE_B_IDLE: /* * 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 bit). * * 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(&musb->dev_timer, jiffies + POLL_SECONDS * HZ); else musb->xceiv->otg->state = OTG_STATE_A_IDLE; break; default: break; } spin_unlock_irqrestore(&musb->lock, flags); } static void da8xx_musb_try_idle(struct musb *musb, unsigned long timeout) { static unsigned long last_timer; if (timeout == 0) timeout = jiffies + msecs_to_jiffies(3); /* 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) && timer_pending(&musb->dev_timer)) { dev_dbg(musb->controller, "Longer idle timer already pending, ignoring...\n"); return; } last_timer = timeout; dev_dbg(musb->controller, "%s inactive, starting idle timer for %u ms\n", usb_otg_state_string(musb->xceiv->otg->state), jiffies_to_msecs(timeout - jiffies)); mod_timer(&musb->dev_timer, timeout); } static irqreturn_t da8xx_musb_interrupt(int irq, void *hci) { struct musb *musb = hci; void __iomem *reg_base = musb->ctrl_base; unsigned long flags; irqreturn_t ret = IRQ_NONE; u32 status; spin_lock_irqsave(&musb->lock, flags); /* * NOTE: DA8XX shadows the Mentor IRQs. Don't manage them through * the Mentor registers (except for setup), use the TI ones and EOI. */ /* Acknowledge and handle non-CPPI interrupts */ status = musb_readl(reg_base, DA8XX_USB_INTR_SRC_MASKED_REG); if (!status) goto eoi; musb_writel(reg_base, DA8XX_USB_INTR_SRC_CLEAR_REG, status); dev_dbg(musb->controller, "USB IRQ %08x\n", status); musb->int_rx = (status & DA8XX_INTR_RX_MASK) >> DA8XX_INTR_RX_SHIFT; musb->int_tx = (status & DA8XX_INTR_TX_MASK) >> DA8XX_INTR_TX_SHIFT; musb->int_usb = (status & DA8XX_INTR_USB_MASK) >> DA8XX_INTR_USB_SHIFT; /* * DRVVBUS IRQs are the only proxy we have (a very poor one!) for * DA8xx'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 that we know its * value but DEVCTL.BDevice is invalid without DEVCTL.Session set. * Also, DRVVBUS pulses for SRP (but not at 5 V)... */ if (status & (DA8XX_INTR_DRVVBUS << DA8XX_INTR_USB_SHIFT)) { int drvvbus = musb_readl(reg_base, DA8XX_USB_STAT_REG); void __iomem *mregs = musb->mregs; u8 devctl = musb_readb(mregs, MUSB_DEVCTL); int err; err = 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 for VBUS to stop registering in * devctl. */ musb->int_usb &= ~MUSB_INTR_VBUSERROR; musb->xceiv->otg->state = OTG_STATE_A_WAIT_VFALL; mod_timer(&musb->dev_timer, jiffies + POLL_SECONDS * HZ); WARNING("VBUS error workaround (delay coming)\n"); } else if (drvvbus) { MUSB_HST_MODE(musb); musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE; portstate(musb->port1_status |= USB_PORT_STAT_POWER); del_timer(&musb->dev_timer); } else if (!(musb->int_usb & MUSB_INTR_BABBLE)) { /* * When babble condition happens, drvvbus interrupt * is also generated. Ignore this drvvbus interrupt * and let babble interrupt handler recovers the * controller; otherwise, the host-mode flag is lost * due to the MUSB_DEV_MODE() call below and babble * recovery logic will not be called. */ musb->is_active = 0; MUSB_DEV_MODE(musb); musb->xceiv->otg->state = OTG_STATE_B_IDLE; portstate(musb->port1_status &= ~USB_PORT_STAT_POWER); } dev_dbg(musb->controller, "VBUS %s (%s)%s, devctl %02x\n", drvvbus ? "on" : "off", usb_otg_state_string(musb->xceiv->otg->state), err ? " ERROR" : "", devctl); ret = IRQ_HANDLED; } if (musb->int_tx || musb->int_rx || musb->int_usb) ret |= musb_interrupt(musb); eoi: /* EOI needs to be written for the IRQ to be re-asserted. */ if (ret == IRQ_HANDLED || status) musb_writel(reg_base, DA8XX_USB_END_OF_INTR_REG, 0); /* Poll for ID change */ if (musb->xceiv->otg->state == OTG_STATE_B_IDLE) mod_timer(&musb->dev_timer, jiffies + POLL_SECONDS * HZ); spin_unlock_irqrestore(&musb->lock, flags); return ret; } static int da8xx_musb_set_mode(struct musb *musb, u8 musb_mode) { struct da8xx_glue *glue = dev_get_drvdata(musb->controller->parent); enum phy_mode phy_mode; /* * The PHY has some issues when it is forced in device or host mode. * Unless the user request another mode, configure the PHY in OTG mode. */ if (!musb->is_initialized) return phy_set_mode(glue->phy, PHY_MODE_USB_OTG); switch (musb_mode) { case MUSB_HOST: /* Force VBUS valid, ID = 0 */ phy_mode = PHY_MODE_USB_HOST; break; case MUSB_PERIPHERAL: /* Force VBUS valid, ID = 1 */ phy_mode = PHY_MODE_USB_DEVICE; break; case MUSB_OTG: /* Don't override the VBUS/ID comparators */ phy_mode = PHY_MODE_USB_OTG; break; default: return -EINVAL; } return phy_set_mode(glue->phy, phy_mode); } static int da8xx_musb_init(struct musb *musb) { struct da8xx_glue *glue = dev_get_drvdata(musb->controller->parent); void __iomem *reg_base = musb->ctrl_base; u32 rev; int ret = -ENODEV; musb->mregs += DA8XX_MENTOR_CORE_OFFSET; ret = clk_prepare_enable(glue->clk); if (ret) { dev_err(glue->dev, "failed to enable clock\n"); return ret; } /* Returns zero if e.g. not clocked */ rev = musb_readl(reg_base, DA8XX_USB_REVISION_REG); if (!rev) goto fail; musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2); if (IS_ERR_OR_NULL(musb->xceiv)) { ret = -EPROBE_DEFER; goto fail; } timer_setup(&musb->dev_timer, otg_timer, 0); /* Reset the controller */ musb_writel(reg_base, DA8XX_USB_CTRL_REG, DA8XX_SOFT_RESET_MASK); /* Start the on-chip PHY and its PLL. */ ret = phy_init(glue->phy); if (ret) { dev_err(glue->dev, "Failed to init phy.\n"); goto fail; } ret = phy_power_on(glue->phy); if (ret) { dev_err(glue->dev, "Failed to power on phy.\n"); goto err_phy_power_on; } msleep(5); /* NOTE: IRQs are in mixed mode, not bypass to pure MUSB */ pr_debug("DA8xx OTG revision %08x, control %02x\n", rev, musb_readb(reg_base, DA8XX_USB_CTRL_REG)); musb->isr = da8xx_musb_interrupt; return 0; err_phy_power_on: phy_exit(glue->phy); fail: clk_disable_unprepare(glue->clk); return ret; } static int da8xx_musb_exit(struct musb *musb) { struct da8xx_glue *glue = dev_get_drvdata(musb->controller->parent); del_timer_sync(&musb->dev_timer); phy_power_off(glue->phy); phy_exit(glue->phy); clk_disable_unprepare(glue->clk); usb_put_phy(musb->xceiv); return 0; } static inline u8 get_vbus_power(struct device *dev) { struct regulator *vbus_supply; int current_uA; vbus_supply = regulator_get_optional(dev, "vbus"); if (IS_ERR(vbus_supply)) return 255; current_uA = regulator_get_current_limit(vbus_supply); regulator_put(vbus_supply); if (current_uA <= 0 || current_uA > 510000) return 255; return current_uA / 1000 / 2; } #ifdef CONFIG_USB_TI_CPPI41_DMA static void da8xx_dma_controller_callback(struct dma_controller *c) { struct musb *musb = c->musb; void __iomem *reg_base = musb->ctrl_base; musb_writel(reg_base, DA8XX_USB_END_OF_INTR_REG, 0); } static struct dma_controller * da8xx_dma_controller_create(struct musb *musb, void __iomem *base) { struct dma_controller *controller; controller = cppi41_dma_controller_create(musb, base); if (IS_ERR_OR_NULL(controller)) return controller; controller->dma_callback = da8xx_dma_controller_callback; return controller; } #endif static const struct musb_platform_ops da8xx_ops = { .quirks = MUSB_INDEXED_EP | MUSB_PRESERVE_SESSION | MUSB_DMA_CPPI41 | MUSB_DA8XX, .init = da8xx_musb_init, .exit = da8xx_musb_exit, .fifo_mode = 2, #ifdef CONFIG_USB_TI_CPPI41_DMA .dma_init = da8xx_dma_controller_create, .dma_exit = cppi41_dma_controller_destroy, #endif .enable = da8xx_musb_enable, .disable = da8xx_musb_disable, .set_mode = da8xx_musb_set_mode, .try_idle = da8xx_musb_try_idle, .set_vbus = da8xx_musb_set_vbus, }; static const struct platform_device_info da8xx_dev_info = { .name = "musb-hdrc", .id = PLATFORM_DEVID_AUTO, .dma_mask = DMA_BIT_MASK(32), }; static const struct musb_hdrc_config da8xx_config = { .ram_bits = 10, .num_eps = 5, .multipoint = 1, }; static struct of_dev_auxdata da8xx_auxdata_lookup[] = { OF_DEV_AUXDATA("ti,da830-cppi41", 0x01e01000, "cppi41-dmaengine", NULL), {} }; static int da8xx_probe(struct platform_device *pdev) { struct resource musb_resources[2]; struct musb_hdrc_platform_data *pdata = dev_get_platdata(&pdev->dev); struct da8xx_glue *glue; struct platform_device_info pinfo; struct clk *clk; struct device_node *np = pdev->dev.of_node; int ret; glue = devm_kzalloc(&pdev->dev, sizeof(*glue), GFP_KERNEL); if (!glue) return -ENOMEM; clk = devm_clk_get(&pdev->dev, NULL); if (IS_ERR(clk)) { dev_err(&pdev->dev, "failed to get clock\n"); return PTR_ERR(clk); } glue->phy = devm_phy_get(&pdev->dev, "usb-phy"); if (IS_ERR(glue->phy)) { if (PTR_ERR(glue->phy) != -EPROBE_DEFER) dev_err(&pdev->dev, "failed to get phy\n"); return PTR_ERR(glue->phy); } glue->dev = &pdev->dev; glue->clk = clk; if (IS_ENABLED(CONFIG_OF) && np) { pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); if (!pdata) return -ENOMEM; pdata->config = &da8xx_config; pdata->mode = musb_get_mode(&pdev->dev); pdata->power = get_vbus_power(&pdev->dev); } pdata->platform_ops = &da8xx_ops; glue->usb_phy = usb_phy_generic_register(); ret = PTR_ERR_OR_ZERO(glue->usb_phy); if (ret) { dev_err(&pdev->dev, "failed to register usb_phy\n"); return ret; } platform_set_drvdata(pdev, glue); ret = of_platform_populate(pdev->dev.of_node, NULL, da8xx_auxdata_lookup, &pdev->dev); if (ret) return ret; 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; pinfo = da8xx_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 = platform_device_register_full(&pinfo); ret = PTR_ERR_OR_ZERO(glue->musb); if (ret) { dev_err(&pdev->dev, "failed to register musb device: %d\n", ret); usb_phy_generic_unregister(glue->usb_phy); } return ret; } static int da8xx_remove(struct platform_device *pdev) { struct da8xx_glue *glue = platform_get_drvdata(pdev); platform_device_unregister(glue->musb); usb_phy_generic_unregister(glue->usb_phy); return 0; } #ifdef CONFIG_PM_SLEEP static int da8xx_suspend(struct device *dev) { int ret; struct da8xx_glue *glue = dev_get_drvdata(dev); ret = phy_power_off(glue->phy); if (ret) return ret; clk_disable_unprepare(glue->clk); return 0; } static int da8xx_resume(struct device *dev) { int ret; struct da8xx_glue *glue = dev_get_drvdata(dev); ret = clk_prepare_enable(glue->clk); if (ret) return ret; return phy_power_on(glue->phy); } #endif static SIMPLE_DEV_PM_OPS(da8xx_pm_ops, da8xx_suspend, da8xx_resume); #ifdef CONFIG_OF static const struct of_device_id da8xx_id_table[] = { { .compatible = "ti,da830-musb", }, {}, }; MODULE_DEVICE_TABLE(of, da8xx_id_table); #endif static struct platform_driver da8xx_driver = { .probe = da8xx_probe, .remove = da8xx_remove, .driver = { .name = "musb-da8xx", .pm = &da8xx_pm_ops, .of_match_table = of_match_ptr(da8xx_id_table), }, }; MODULE_DESCRIPTION("DA8xx/OMAP-L1x MUSB Glue Layer"); MODULE_AUTHOR("Sergei Shtylyov "); MODULE_LICENSE("GPL v2"); module_platform_driver(da8xx_driver);