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- // SPDX-License-Identifier: GPL-2.0
- /*
- * Texas Instruments da8xx "glue layer"
- *
- * Copyright (c) 2019, by Texas Instruments
- *
- * Based on the DA8xx "glue layer" code.
- * Copyright (c) 2008-2019, MontaVista Software, Inc. <source@mvista.com>
- *
- * DT support
- * Copyright (c) 2016 Petr Kulhavy <petr@barix.com>
- * This file is part of the Inventra Controller Driver for Linux.
- *
- */
- #include <common.h>
- #include <dm.h>
- #include <log.h>
- #include <dm/device-internal.h>
- #include <dm/device_compat.h>
- #include <dm/lists.h>
- #include <asm/arch/hardware.h>
- #include <asm/arch/da8xx-usb.h>
- #include <linux/delay.h>
- #include <linux/usb/otg.h>
- #include <asm/omap_musb.h>
- #include <generic-phy.h>
- #include "linux-compat.h"
- #include "musb_core.h"
- #include "musb_uboot.h"
- /* 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
- 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;
- WARNING("VBUS error workaround (delay coming)\n");
- } else if (drvvbus) {
- MUSB_HST_MODE(musb);
- musb->port1_status |= USB_PORT_STAT_POWER;
- } 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->port1_status &= ~USB_PORT_STAT_POWER;
- }
- 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);
- spin_unlock_irqrestore(&musb->lock, flags);
- return ret;
- }
- static int da8xx_musb_init(struct musb *musb)
- {
- u32 revision;
- void __iomem *reg_base = musb->ctrl_base;
- int ret;
- /* reset the controller */
- writel(0x1, &da8xx_usb_regs->control);
- udelay(50);
- /* Returns zero if e.g. not clocked */
- revision = readl(&da8xx_usb_regs->revision);
- if (revision == 0)
- return -ENODEV;
- /* Disable all interrupts */
- writel((DA8XX_USB_USBINT_MASK | DA8XX_USB_TXINT_MASK |
- DA8XX_USB_RXINT_MASK), &da8xx_usb_regs->intmsk_set);
- musb->mregs += DA8XX_MENTOR_CORE_OFFSET;
- /* NOTE: IRQs are in mixed mode, not bypass to pure MUSB */
- debug("DA8xx OTG revision %08x, control %02x\n", revision,
- musb_readb(reg_base, DA8XX_USB_CTRL_REG));
- musb->isr = da8xx_musb_interrupt;
- return 0;
- }
- static int da8xx_musb_exit(struct musb *musb)
- {
- /* flush any interrupts */
- writel((DA8XX_USB_USBINT_MASK | DA8XX_USB_TXINT_MASK |
- DA8XX_USB_RXINT_MASK), &da8xx_usb_regs->intmsk_clr);
- writel(0, &da8xx_usb_regs->eoi);
- return 0;
- }
- /**
- * da8xx_musb_enable - enable interrupts
- */
- static int 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);
- return 0;
- }
- /**
- * 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);
- }
- void da8xx_musb_reset(struct udevice *dev)
- {
- void *reg_base = dev_read_addr_ptr(dev);
- /* Reset the controller */
- musb_writel(reg_base, DA8XX_USB_CTRL_REG, DA8XX_SOFT_RESET_MASK);
- }
- void da8xx_musb_clear_irq(struct udevice *dev)
- {
- /* flush any interrupts */
- writel((DA8XX_USB_USBINT_MASK | DA8XX_USB_TXINT_MASK |
- DA8XX_USB_RXINT_MASK), &da8xx_usb_regs->intmsk_clr);
- writel(0, &da8xx_usb_regs->eoi);
- }
- const struct musb_platform_ops da8xx_ops = {
- .init = da8xx_musb_init,
- .exit = da8xx_musb_exit,
- .enable = da8xx_musb_enable,
- .disable = da8xx_musb_disable,
- };
- struct da8xx_musb_platdata {
- void *base;
- void *ctrl_mod_base;
- struct musb_hdrc_platform_data plat;
- struct musb_hdrc_config musb_config;
- struct omap_musb_board_data otg_board_data;
- struct phy phy;
- };
- static int da8xx_musb_ofdata_to_platdata(struct udevice *dev)
- {
- struct da8xx_musb_platdata *platdata = dev_get_platdata(dev);
- const void *fdt = gd->fdt_blob;
- int node = dev_of_offset(dev);
- platdata->base = (void *)dev_read_addr_ptr(dev);
- platdata->musb_config.multipoint = 1;
- platdata->musb_config.dyn_fifo = 1;
- platdata->musb_config.num_eps = 5;
- platdata->musb_config.ram_bits = 10;
- platdata->plat.power = fdtdec_get_int(fdt, node, "power", 50);
- platdata->otg_board_data.interface_type = MUSB_INTERFACE_UTMI;
- platdata->plat.mode = MUSB_HOST;
- platdata->otg_board_data.dev = dev;
- platdata->plat.config = &platdata->musb_config;
- platdata->plat.platform_ops = &da8xx_ops;
- platdata->plat.board_data = &platdata->otg_board_data;
- platdata->otg_board_data.clear_irq = da8xx_musb_clear_irq;
- platdata->otg_board_data.reset = da8xx_musb_reset;
- return 0;
- }
- static int da8xx_musb_probe(struct udevice *dev)
- {
- struct musb_host_data *host = dev_get_priv(dev);
- struct da8xx_musb_platdata *platdata = dev_get_platdata(dev);
- struct usb_bus_priv *priv = dev_get_uclass_priv(dev);
- struct omap_musb_board_data *otg_board_data;
- int ret;
- void *base = dev_read_addr_ptr(dev);
- /* Get the phy info from the device tree */
- ret = generic_phy_get_by_name(dev, "usb-phy", &platdata->phy);
- if (ret)
- return ret;
- /* Initialize the phy */
- ret = generic_phy_init(&platdata->phy);
- if (ret)
- return ret;
- /* enable psc for usb2.0 */
- lpsc_on(33);
- /* Enable phy */
- generic_phy_power_on(&platdata->phy);
- priv->desc_before_addr = true;
- otg_board_data = &platdata->otg_board_data;
- host->host = musb_init_controller(&platdata->plat,
- (struct device *)otg_board_data,
- platdata->base);
- if (!host->host) {
- ret = -ENODEV;
- goto shutdown; /* Shutdown what we started */
- }
- ret = musb_lowlevel_init(host);
- if (ret == 0)
- return 0;
- shutdown:
- /* Turn off the phy if we fail */
- generic_phy_power_off(&platdata->phy);
- lpsc_disable(33);
- return ret;
- }
- static int da8xx_musb_remove(struct udevice *dev)
- {
- struct musb_host_data *host = dev_get_priv(dev);
- musb_stop(host->host);
- return 0;
- }
- static const struct udevice_id da8xx_musb_ids[] = {
- { .compatible = "ti,da830-musb" },
- { }
- };
- U_BOOT_DRIVER(da8xx_musb) = {
- .name = "da8xx-musb",
- .id = UCLASS_USB,
- .of_match = da8xx_musb_ids,
- .ofdata_to_platdata = da8xx_musb_ofdata_to_platdata,
- .probe = da8xx_musb_probe,
- .remove = da8xx_musb_remove,
- .ops = &musb_usb_ops,
- .platdata_auto_alloc_size = sizeof(struct da8xx_musb_platdata),
- .priv_auto_alloc_size = sizeof(struct musb_host_data),
- };
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