--- /dev/null
+// 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 <dm/device-internal.h>
+#include <dm/lists.h>
+#include <asm/arch/hardware.h>
+#include <asm/arch/da8xx-usb.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),
+};
projects / platform / kernel / u-boot.git / commitdiff