1 files changed, 385 insertions, 0 deletions
diff --git a/arch/arm/mach-pxa/pxa3xx-ulpi.c b/arch/arm/mach-pxa/pxa3xx-ulpi.c
new file mode 100644
index 000000000..c29a7f0fa
--- /dev/null
+++ b/arch/arm/mach-pxa/pxa3xx-ulpi.c
@@ -0,0 +1,385 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * linux/arch/arm/mach-pxa/pxa3xx-ulpi.c
+ *
+ * code specific to pxa3xx aka Monahans
+ *
+ * Copyright (C) 2010 CompuLab Ltd.
+ *
+ * 2010-13-07: Igor Grinberg <grinberg@compulab.co.il>
+ *             initial version: pxa310 USB Host mode support
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/delay.h>
+#include <linux/clk.h>
+#include <linux/usb.h>
+#include <linux/usb/otg.h>
+#include <linux/soc/pxa/cpu.h>
+
+#include "regs-u2d.h"
+#include <linux/platform_data/usb-pxa3xx-ulpi.h>
+
+struct pxa3xx_u2d_ulpi {
+	struct clk		*clk;
+	void __iomem		*mmio_base;
+
+	struct usb_phy		*otg;
+	unsigned int		ulpi_mode;
+};
+
+static struct pxa3xx_u2d_ulpi *u2d;
+
+static inline u32 u2d_readl(u32 reg)
+{
+	return __raw_readl(u2d->mmio_base + reg);
+}
+
+static inline void u2d_writel(u32 reg, u32 val)
+{
+	__raw_writel(val, u2d->mmio_base + reg);
+}
+
+#if defined(CONFIG_PXA310_ULPI)
+enum u2d_ulpi_phy_mode {
+	SYNCH		= 0,
+	CARKIT		= (1 << 0),
+	SER_3PIN	= (1 << 1),
+	SER_6PIN	= (1 << 2),
+	LOWPOWER	= (1 << 3),
+};
+
+static inline enum u2d_ulpi_phy_mode pxa310_ulpi_get_phymode(void)
+{
+	return (u2d_readl(U2DOTGUSR) >> 28) & 0xF;
+}
+
+static int pxa310_ulpi_poll(void)
+{
+	int timeout = 50000;
+
+	while (timeout--) {
+		if (!(u2d_readl(U2DOTGUCR) & U2DOTGUCR_RUN))
+			return 0;
+
+		cpu_relax();
+	}
+
+	pr_warn("%s: ULPI access timed out!\n", __func__);
+
+	return -ETIMEDOUT;
+}
+
+static int pxa310_ulpi_read(struct usb_phy *otg, u32 reg)
+{
+	int err;
+
+	if (pxa310_ulpi_get_phymode() != SYNCH) {
+		pr_warn("%s: PHY is not in SYNCH mode!\n", __func__);
+		return -EBUSY;
+	}
+
+	u2d_writel(U2DOTGUCR, U2DOTGUCR_RUN | U2DOTGUCR_RNW | (reg << 16));
+	msleep(5);
+
+	err = pxa310_ulpi_poll();
+	if (err)
+		return err;
+
+	return u2d_readl(U2DOTGUCR) & U2DOTGUCR_RDATA;
+}
+
+static int pxa310_ulpi_write(struct usb_phy *otg, u32 val, u32 reg)
+{
+	if (pxa310_ulpi_get_phymode() != SYNCH) {
+		pr_warn("%s: PHY is not in SYNCH mode!\n", __func__);
+		return -EBUSY;
+	}
+
+	u2d_writel(U2DOTGUCR, U2DOTGUCR_RUN | (reg << 16) | (val << 8));
+	msleep(5);
+
+	return pxa310_ulpi_poll();
+}
+
+struct usb_phy_io_ops pxa310_ulpi_access_ops = {
+	.read	= pxa310_ulpi_read,
+	.write	= pxa310_ulpi_write,
+};
+
+static void pxa310_otg_transceiver_rtsm(void)
+{
+	u32 u2dotgcr;
+
+	/* put PHY to sync mode */
+	u2dotgcr = u2d_readl(U2DOTGCR);
+	u2dotgcr |=  U2DOTGCR_RTSM | U2DOTGCR_UTMID;
+	u2d_writel(U2DOTGCR, u2dotgcr);
+	msleep(10);
+
+	/* setup OTG sync mode */
+	u2dotgcr = u2d_readl(U2DOTGCR);
+	u2dotgcr |= U2DOTGCR_ULAF;
+	u2dotgcr &= ~(U2DOTGCR_SMAF | U2DOTGCR_CKAF);
+	u2d_writel(U2DOTGCR, u2dotgcr);
+}
+
+static int pxa310_start_otg_host_transcvr(struct usb_bus *host)
+{
+	int err;
+
+	pxa310_otg_transceiver_rtsm();
+
+	err = usb_phy_init(u2d->otg);
+	if (err) {
+		pr_err("OTG transceiver init failed");
+		return err;
+	}
+
+	err = otg_set_vbus(u2d->otg->otg, 1);
+	if (err) {
+		pr_err("OTG transceiver VBUS set failed");
+		return err;
+	}
+
+	err = otg_set_host(u2d->otg->otg, host);
+	if (err)
+		pr_err("OTG transceiver Host mode set failed");
+
+	return err;
+}
+
+static int pxa310_start_otg_hc(struct usb_bus *host)
+{
+	u32 u2dotgcr;
+	int err;
+
+	/* disable USB device controller */
+	u2d_writel(U2DCR, u2d_readl(U2DCR) & ~U2DCR_UDE);
+	u2d_writel(U2DOTGCR, u2d_readl(U2DOTGCR) | U2DOTGCR_UTMID);
+	u2d_writel(U2DOTGICR, u2d_readl(U2DOTGICR) & ~0x37F7F);
+
+	err = pxa310_start_otg_host_transcvr(host);
+	if (err)
+		return err;
+
+	/* set xceiver mode */
+	if (u2d->ulpi_mode & ULPI_IC_6PIN_SERIAL)
+		u2d_writel(U2DP3CR, u2d_readl(U2DP3CR) & ~U2DP3CR_P2SS);
+	else if (u2d->ulpi_mode & ULPI_IC_3PIN_SERIAL)
+		u2d_writel(U2DP3CR, u2d_readl(U2DP3CR) | U2DP3CR_P2SS);
+
+	/* start OTG host controller */
+	u2dotgcr = u2d_readl(U2DOTGCR) | U2DOTGCR_SMAF;
+	u2d_writel(U2DOTGCR, u2dotgcr & ~(U2DOTGCR_ULAF | U2DOTGCR_CKAF));
+
+	return 0;
+}
+
+static void pxa310_stop_otg_hc(void)
+{
+	pxa310_otg_transceiver_rtsm();
+
+	otg_set_host(u2d->otg->otg, NULL);
+	otg_set_vbus(u2d->otg->otg, 0);
+	usb_phy_shutdown(u2d->otg);
+}
+
+static void pxa310_u2d_setup_otg_hc(void)
+{
+	u32 u2dotgcr;
+
+	u2dotgcr = u2d_readl(U2DOTGCR);
+	u2dotgcr |= U2DOTGCR_ULAF | U2DOTGCR_UTMID;
+	u2dotgcr &= ~(U2DOTGCR_SMAF | U2DOTGCR_CKAF);
+	u2d_writel(U2DOTGCR, u2dotgcr);
+	msleep(5);
+	u2d_writel(U2DOTGCR, u2dotgcr | U2DOTGCR_ULE);
+	msleep(5);
+	u2d_writel(U2DOTGICR, u2d_readl(U2DOTGICR) & ~0x37F7F);
+}
+
+static int pxa310_otg_init(struct pxa3xx_u2d_platform_data *pdata)
+{
+	unsigned int ulpi_mode = ULPI_OTG_DRVVBUS;
+
+	if (pdata) {
+		if (pdata->ulpi_mode & ULPI_SER_6PIN)
+			ulpi_mode |= ULPI_IC_6PIN_SERIAL;
+		else if (pdata->ulpi_mode & ULPI_SER_3PIN)
+			ulpi_mode |= ULPI_IC_3PIN_SERIAL;
+	}
+
+	u2d->ulpi_mode = ulpi_mode;
+
+	u2d->otg = otg_ulpi_create(&pxa310_ulpi_access_ops, ulpi_mode);
+	if (!u2d->otg)
+		return -ENOMEM;
+
+	u2d->otg->io_priv = u2d->mmio_base;
+
+	return 0;
+}
+
+static void pxa310_otg_exit(void)
+{
+	kfree(u2d->otg);
+}
+#else
+static inline void pxa310_u2d_setup_otg_hc(void) {}
+static inline int pxa310_start_otg_hc(struct usb_bus *host)
+{
+	return 0;
+}
+static inline void pxa310_stop_otg_hc(void) {}
+static inline int pxa310_otg_init(struct pxa3xx_u2d_platform_data *pdata)
+{
+	return 0;
+}
+static inline void pxa310_otg_exit(void) {}
+#endif /* CONFIG_PXA310_ULPI */
+
+int pxa3xx_u2d_start_hc(struct usb_bus *host)
+{
+	int err = 0;
+
+	/* In case the PXA3xx ULPI isn't used, do nothing. */
+	if (!u2d)
+		return 0;
+
+	clk_prepare_enable(u2d->clk);
+
+	if (cpu_is_pxa310()) {
+		pxa310_u2d_setup_otg_hc();
+		err = pxa310_start_otg_hc(host);
+	}
+
+	return err;
+}
+EXPORT_SYMBOL_GPL(pxa3xx_u2d_start_hc);
+
+void pxa3xx_u2d_stop_hc(struct usb_bus *host)
+{
+	/* In case the PXA3xx ULPI isn't used, do nothing. */
+	if (!u2d)
+		return;
+
+	if (cpu_is_pxa310())
+		pxa310_stop_otg_hc();
+
+	clk_disable_unprepare(u2d->clk);
+}
+EXPORT_SYMBOL_GPL(pxa3xx_u2d_stop_hc);
+
+static int pxa3xx_u2d_probe(struct platform_device *pdev)
+{
+	struct pxa3xx_u2d_platform_data *pdata = pdev->dev.platform_data;
+	struct resource *r;
+	int err;
+
+	u2d = kzalloc(sizeof(*u2d), GFP_KERNEL);
+	if (!u2d)
+		return -ENOMEM;
+
+	u2d->clk = clk_get(&pdev->dev, NULL);
+	if (IS_ERR(u2d->clk)) {
+		dev_err(&pdev->dev, "failed to get u2d clock\n");
+		err = PTR_ERR(u2d->clk);
+		goto err_free_mem;
+	}
+
+	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!r) {
+		dev_err(&pdev->dev, "no IO memory resource defined\n");
+		err = -ENODEV;
+		goto err_put_clk;
+	}
+
+        r = request_mem_region(r->start, resource_size(r), pdev->name);
+        if (!r) {
+                dev_err(&pdev->dev, "failed to request memory resource\n");
+                err = -EBUSY;
+                goto err_put_clk;
+        }
+
+	u2d->mmio_base = ioremap(r->start, resource_size(r));
+	if (!u2d->mmio_base) {
+		dev_err(&pdev->dev, "ioremap() failed\n");
+		err = -ENODEV;
+		goto err_free_res;
+	}
+
+	if (pdata->init) {
+		err = pdata->init(&pdev->dev);
+		if (err)
+			goto err_free_io;
+	}
+
+	/* Only PXA310 U2D has OTG functionality */
+	if (cpu_is_pxa310()) {
+		err = pxa310_otg_init(pdata);
+		if (err)
+			goto err_free_plat;
+	}
+
+	platform_set_drvdata(pdev, u2d);
+
+	return 0;
+
+err_free_plat:
+	if (pdata->exit)
+		pdata->exit(&pdev->dev);
+err_free_io:
+	iounmap(u2d->mmio_base);
+err_free_res:
+	release_mem_region(r->start, resource_size(r));
+err_put_clk:
+	clk_put(u2d->clk);
+err_free_mem:
+	kfree(u2d);
+	return err;
+}
+
+static int pxa3xx_u2d_remove(struct platform_device *pdev)
+{
+	struct pxa3xx_u2d_platform_data *pdata = pdev->dev.platform_data;
+	struct resource *r;
+
+	if (cpu_is_pxa310()) {
+		pxa310_stop_otg_hc();
+		pxa310_otg_exit();
+	}
+
+	if (pdata->exit)
+		pdata->exit(&pdev->dev);
+
+	platform_set_drvdata(pdev, NULL);
+	iounmap(u2d->mmio_base);
+	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	release_mem_region(r->start, resource_size(r));
+
+	clk_put(u2d->clk);
+
+	kfree(u2d);
+
+	return 0;
+}
+
+static struct platform_driver pxa3xx_u2d_ulpi_driver = {
+        .driver		= {
+                .name   = "pxa3xx-u2d",
+        },
+        .probe          = pxa3xx_u2d_probe,
+        .remove         = pxa3xx_u2d_remove,
+};
+module_platform_driver(pxa3xx_u2d_ulpi_driver);
+
+MODULE_DESCRIPTION("PXA3xx U2D ULPI driver");
+MODULE_AUTHOR("Igor Grinberg");
+MODULE_LICENSE("GPL v2");