Initial import

1 files changed, 484 insertions, 0 deletions

diff --git a/drivers/mfd/omap-usb-tll.c b/drivers/mfd/omap-usb-tll.c
new file mode 100644
index 000000000..b7b3e8ee6
--- /dev/null
+++ b/drivers/mfd/omap-usb-tll.c
@@ -0,0 +1,484 @@
+/**
+ * omap-usb-tll.c - The USB TLL driver for OMAP EHCI & OHCI
+ *
+ * Copyright (C) 2012-2013 Texas Instruments Incorporated - http://www.ti.com
+ * Author: Keshava Munegowda <keshava_mgowda@ti.com>
+ * Author: Roger Quadros <rogerq@ti.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2  of
+ * the License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/err.h>
+#include <linux/pm_runtime.h>
+#include <linux/platform_data/usb-omap.h>
+#include <linux/of.h>
+
+#define USBTLL_DRIVER_NAME	"usbhs_tll"
+
+/* TLL Register Set */
+#define	OMAP_USBTLL_REVISION				(0x00)
+#define	OMAP_USBTLL_SYSCONFIG				(0x10)
+#define	OMAP_USBTLL_SYSCONFIG_CACTIVITY			(1 << 8)
+#define	OMAP_USBTLL_SYSCONFIG_SIDLEMODE			(1 << 3)
+#define	OMAP_USBTLL_SYSCONFIG_ENAWAKEUP			(1 << 2)
+#define	OMAP_USBTLL_SYSCONFIG_SOFTRESET			(1 << 1)
+#define	OMAP_USBTLL_SYSCONFIG_AUTOIDLE			(1 << 0)
+
+#define	OMAP_USBTLL_SYSSTATUS				(0x14)
+#define	OMAP_USBTLL_SYSSTATUS_RESETDONE			(1 << 0)
+
+#define	OMAP_USBTLL_IRQSTATUS				(0x18)
+#define	OMAP_USBTLL_IRQENABLE				(0x1C)
+
+#define	OMAP_TLL_SHARED_CONF				(0x30)
+#define	OMAP_TLL_SHARED_CONF_USB_90D_DDR_EN		(1 << 6)
+#define	OMAP_TLL_SHARED_CONF_USB_180D_SDR_EN		(1 << 5)
+#define	OMAP_TLL_SHARED_CONF_USB_DIVRATION		(1 << 2)
+#define	OMAP_TLL_SHARED_CONF_FCLK_REQ			(1 << 1)
+#define	OMAP_TLL_SHARED_CONF_FCLK_IS_ON			(1 << 0)
+
+#define	OMAP_TLL_CHANNEL_CONF(num)			(0x040 + 0x004 * num)
+#define OMAP_TLL_CHANNEL_CONF_FSLSMODE_SHIFT		24
+#define OMAP_TLL_CHANNEL_CONF_DRVVBUS			(1 << 16)
+#define OMAP_TLL_CHANNEL_CONF_CHRGVBUS			(1 << 15)
+#define	OMAP_TLL_CHANNEL_CONF_ULPINOBITSTUFF		(1 << 11)
+#define	OMAP_TLL_CHANNEL_CONF_ULPI_ULPIAUTOIDLE		(1 << 10)
+#define	OMAP_TLL_CHANNEL_CONF_UTMIAUTOIDLE		(1 << 9)
+#define	OMAP_TLL_CHANNEL_CONF_ULPIDDRMODE		(1 << 8)
+#define OMAP_TLL_CHANNEL_CONF_MODE_TRANSPARENT_UTMI	(2 << 1)
+#define OMAP_TLL_CHANNEL_CONF_CHANMODE_FSLS		(1 << 1)
+#define	OMAP_TLL_CHANNEL_CONF_CHANEN			(1 << 0)
+
+#define OMAP_TLL_FSLSMODE_6PIN_PHY_DAT_SE0		0x0
+#define OMAP_TLL_FSLSMODE_6PIN_PHY_DP_DM		0x1
+#define OMAP_TLL_FSLSMODE_3PIN_PHY			0x2
+#define OMAP_TLL_FSLSMODE_4PIN_PHY			0x3
+#define OMAP_TLL_FSLSMODE_6PIN_TLL_DAT_SE0		0x4
+#define OMAP_TLL_FSLSMODE_6PIN_TLL_DP_DM		0x5
+#define OMAP_TLL_FSLSMODE_3PIN_TLL			0x6
+#define OMAP_TLL_FSLSMODE_4PIN_TLL			0x7
+#define OMAP_TLL_FSLSMODE_2PIN_TLL_DAT_SE0		0xA
+#define OMAP_TLL_FSLSMODE_2PIN_DAT_DP_DM		0xB
+
+#define	OMAP_TLL_ULPI_FUNCTION_CTRL(num)		(0x804 + 0x100 * num)
+#define	OMAP_TLL_ULPI_INTERFACE_CTRL(num)		(0x807 + 0x100 * num)
+#define	OMAP_TLL_ULPI_OTG_CTRL(num)			(0x80A + 0x100 * num)
+#define	OMAP_TLL_ULPI_INT_EN_RISE(num)			(0x80D + 0x100 * num)
+#define	OMAP_TLL_ULPI_INT_EN_FALL(num)			(0x810 + 0x100 * num)
+#define	OMAP_TLL_ULPI_INT_STATUS(num)			(0x813 + 0x100 * num)
+#define	OMAP_TLL_ULPI_INT_LATCH(num)			(0x814 + 0x100 * num)
+#define	OMAP_TLL_ULPI_DEBUG(num)			(0x815 + 0x100 * num)
+#define	OMAP_TLL_ULPI_SCRATCH_REGISTER(num)		(0x816 + 0x100 * num)
+
+#define OMAP_REV2_TLL_CHANNEL_COUNT			2
+#define OMAP_TLL_CHANNEL_COUNT				3
+#define OMAP_TLL_CHANNEL_1_EN_MASK			(1 << 0)
+#define OMAP_TLL_CHANNEL_2_EN_MASK			(1 << 1)
+#define OMAP_TLL_CHANNEL_3_EN_MASK			(1 << 2)
+
+/* Values of USBTLL_REVISION - Note: these are not given in the TRM */
+#define OMAP_USBTLL_REV1		0x00000015	/* OMAP3 */
+#define OMAP_USBTLL_REV2		0x00000018	/* OMAP 3630 */
+#define OMAP_USBTLL_REV3		0x00000004	/* OMAP4 */
+#define OMAP_USBTLL_REV4		0x00000006	/* OMAP5 */
+
+#define is_ehci_tll_mode(x)	(x == OMAP_EHCI_PORT_MODE_TLL)
+
+/* only PHY and UNUSED modes don't need TLL */
+#define omap_usb_mode_needs_tll(x)	((x) != OMAP_USBHS_PORT_MODE_UNUSED &&\
+					 (x) != OMAP_EHCI_PORT_MODE_PHY)
+
+struct usbtll_omap {
+	int					nch;	/* num. of channels */
+	struct clk				**ch_clk;
+	void __iomem				*base;
+};
+
+/*-------------------------------------------------------------------------*/
+
+static const char usbtll_driver_name[] = USBTLL_DRIVER_NAME;
+static struct device	*tll_dev;
+static DEFINE_SPINLOCK(tll_lock);	/* serialize access to tll_dev */
+
+/*-------------------------------------------------------------------------*/
+
+static inline void usbtll_write(void __iomem *base, u32 reg, u32 val)
+{
+	writel_relaxed(val, base + reg);
+}
+
+static inline u32 usbtll_read(void __iomem *base, u32 reg)
+{
+	return readl_relaxed(base + reg);
+}
+
+static inline void usbtll_writeb(void __iomem *base, u8 reg, u8 val)
+{
+	writeb_relaxed(val, base + reg);
+}
+
+static inline u8 usbtll_readb(void __iomem *base, u8 reg)
+{
+	return readb_relaxed(base + reg);
+}
+
+/*-------------------------------------------------------------------------*/
+
+static bool is_ohci_port(enum usbhs_omap_port_mode pmode)
+{
+	switch (pmode) {
+	case OMAP_OHCI_PORT_MODE_PHY_6PIN_DATSE0:
+	case OMAP_OHCI_PORT_MODE_PHY_6PIN_DPDM:
+	case OMAP_OHCI_PORT_MODE_PHY_3PIN_DATSE0:
+	case OMAP_OHCI_PORT_MODE_PHY_4PIN_DPDM:
+	case OMAP_OHCI_PORT_MODE_TLL_6PIN_DATSE0:
+	case OMAP_OHCI_PORT_MODE_TLL_6PIN_DPDM:
+	case OMAP_OHCI_PORT_MODE_TLL_3PIN_DATSE0:
+	case OMAP_OHCI_PORT_MODE_TLL_4PIN_DPDM:
+	case OMAP_OHCI_PORT_MODE_TLL_2PIN_DATSE0:
+	case OMAP_OHCI_PORT_MODE_TLL_2PIN_DPDM:
+		return true;
+
+	default:
+		return false;
+	}
+}
+
+/*
+ * convert the port-mode enum to a value we can use in the FSLSMODE
+ * field of USBTLL_CHANNEL_CONF
+ */
+static unsigned ohci_omap3_fslsmode(enum usbhs_omap_port_mode mode)
+{
+	switch (mode) {
+	case OMAP_USBHS_PORT_MODE_UNUSED:
+	case OMAP_OHCI_PORT_MODE_PHY_6PIN_DATSE0:
+		return OMAP_TLL_FSLSMODE_6PIN_PHY_DAT_SE0;
+
+	case OMAP_OHCI_PORT_MODE_PHY_6PIN_DPDM:
+		return OMAP_TLL_FSLSMODE_6PIN_PHY_DP_DM;
+
+	case OMAP_OHCI_PORT_MODE_PHY_3PIN_DATSE0:
+		return OMAP_TLL_FSLSMODE_3PIN_PHY;
+
+	case OMAP_OHCI_PORT_MODE_PHY_4PIN_DPDM:
+		return OMAP_TLL_FSLSMODE_4PIN_PHY;
+
+	case OMAP_OHCI_PORT_MODE_TLL_6PIN_DATSE0:
+		return OMAP_TLL_FSLSMODE_6PIN_TLL_DAT_SE0;
+
+	case OMAP_OHCI_PORT_MODE_TLL_6PIN_DPDM:
+		return OMAP_TLL_FSLSMODE_6PIN_TLL_DP_DM;
+
+	case OMAP_OHCI_PORT_MODE_TLL_3PIN_DATSE0:
+		return OMAP_TLL_FSLSMODE_3PIN_TLL;
+
+	case OMAP_OHCI_PORT_MODE_TLL_4PIN_DPDM:
+		return OMAP_TLL_FSLSMODE_4PIN_TLL;
+
+	case OMAP_OHCI_PORT_MODE_TLL_2PIN_DATSE0:
+		return OMAP_TLL_FSLSMODE_2PIN_TLL_DAT_SE0;
+
+	case OMAP_OHCI_PORT_MODE_TLL_2PIN_DPDM:
+		return OMAP_TLL_FSLSMODE_2PIN_DAT_DP_DM;
+	default:
+		pr_warn("Invalid port mode, using default\n");
+		return OMAP_TLL_FSLSMODE_6PIN_PHY_DAT_SE0;
+	}
+}
+
+/**
+ * usbtll_omap_probe - initialize TI-based HCDs
+ *
+ * Allocates basic resources for this USB host controller.
+ */
+static int usbtll_omap_probe(struct platform_device *pdev)
+{
+	struct device				*dev =  &pdev->dev;
+	struct resource				*res;
+	struct usbtll_omap			*tll;
+	int					ret = 0;
+	int					i, ver;
+
+	dev_dbg(dev, "starting TI HSUSB TLL Controller\n");
+
+	tll = devm_kzalloc(dev, sizeof(struct usbtll_omap), GFP_KERNEL);
+	if (!tll) {
+		dev_err(dev, "Memory allocation failed\n");
+		return -ENOMEM;
+	}
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	tll->base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(tll->base))
+		return PTR_ERR(tll->base);
+
+	platform_set_drvdata(pdev, tll);
+	pm_runtime_enable(dev);
+	pm_runtime_get_sync(dev);
+
+	ver =  usbtll_read(tll->base, OMAP_USBTLL_REVISION);
+	switch (ver) {
+	case OMAP_USBTLL_REV1:
+	case OMAP_USBTLL_REV4:
+		tll->nch = OMAP_TLL_CHANNEL_COUNT;
+		break;
+	case OMAP_USBTLL_REV2:
+	case OMAP_USBTLL_REV3:
+		tll->nch = OMAP_REV2_TLL_CHANNEL_COUNT;
+		break;
+	default:
+		tll->nch = OMAP_TLL_CHANNEL_COUNT;
+		dev_dbg(dev,
+		 "USB TLL Rev : 0x%x not recognized, assuming %d channels\n",
+			ver, tll->nch);
+		break;
+	}
+
+	tll->ch_clk = devm_kzalloc(dev, sizeof(struct clk *) * tll->nch,
+						GFP_KERNEL);
+	if (!tll->ch_clk) {
+		ret = -ENOMEM;
+		dev_err(dev, "Couldn't allocate memory for channel clocks\n");
+		goto err_clk_alloc;
+	}
+
+	for (i = 0; i < tll->nch; i++) {
+		char clkname[] = "usb_tll_hs_usb_chx_clk";
+
+		snprintf(clkname, sizeof(clkname),
+					"usb_tll_hs_usb_ch%d_clk", i);
+		tll->ch_clk[i] = clk_get(dev, clkname);
+
+		if (IS_ERR(tll->ch_clk[i]))
+			dev_dbg(dev, "can't get clock : %s\n", clkname);
+	}
+
+	pm_runtime_put_sync(dev);
+	/* only after this can omap_tll_enable/disable work */
+	spin_lock(&tll_lock);
+	tll_dev = dev;
+	spin_unlock(&tll_lock);
+
+	return 0;
+
+err_clk_alloc:
+	pm_runtime_put_sync(dev);
+	pm_runtime_disable(dev);
+
+	return ret;
+}
+
+/**
+ * usbtll_omap_remove - shutdown processing for UHH & TLL HCDs
+ * @pdev: USB Host Controller being removed
+ *
+ * Reverses the effect of usbtll_omap_probe().
+ */
+static int usbtll_omap_remove(struct platform_device *pdev)
+{
+	struct usbtll_omap *tll = platform_get_drvdata(pdev);
+	int i;
+
+	spin_lock(&tll_lock);
+	tll_dev = NULL;
+	spin_unlock(&tll_lock);
+
+	for (i = 0; i < tll->nch; i++)
+		if (!IS_ERR(tll->ch_clk[i]))
+			clk_put(tll->ch_clk[i]);
+
+	pm_runtime_disable(&pdev->dev);
+	return 0;
+}
+
+static const struct of_device_id usbtll_omap_dt_ids[] = {
+	{ .compatible = "ti,usbhs-tll" },
+	{ }
+};
+
+MODULE_DEVICE_TABLE(of, usbtll_omap_dt_ids);
+
+static struct platform_driver usbtll_omap_driver = {
+	.driver = {
+		.name		= (char *)usbtll_driver_name,
+		.of_match_table = usbtll_omap_dt_ids,
+	},
+	.probe		= usbtll_omap_probe,
+	.remove		= usbtll_omap_remove,
+};
+
+int omap_tll_init(struct usbhs_omap_platform_data *pdata)
+{
+	int i;
+	bool needs_tll;
+	unsigned reg;
+	struct usbtll_omap *tll;
+
+	if (!tll_dev)
+		return -ENODEV;
+
+	pm_runtime_get_sync(tll_dev);
+
+	spin_lock(&tll_lock);
+	tll = dev_get_drvdata(tll_dev);
+	needs_tll = false;
+	for (i = 0; i < tll->nch; i++)
+		needs_tll |= omap_usb_mode_needs_tll(pdata->port_mode[i]);
+
+	if (needs_tll) {
+		void __iomem *base = tll->base;
+
+		/* Program Common TLL register */
+		reg = usbtll_read(base, OMAP_TLL_SHARED_CONF);
+		reg |= (OMAP_TLL_SHARED_CONF_FCLK_IS_ON
+			| OMAP_TLL_SHARED_CONF_USB_DIVRATION);
+		reg &= ~OMAP_TLL_SHARED_CONF_USB_90D_DDR_EN;
+		reg &= ~OMAP_TLL_SHARED_CONF_USB_180D_SDR_EN;
+
+		usbtll_write(base, OMAP_TLL_SHARED_CONF, reg);
+
+		/* Enable channels now */
+		for (i = 0; i < tll->nch; i++) {
+			reg = usbtll_read(base,	OMAP_TLL_CHANNEL_CONF(i));
+
+			if (is_ohci_port(pdata->port_mode[i])) {
+				reg |= ohci_omap3_fslsmode(pdata->port_mode[i])
+				<< OMAP_TLL_CHANNEL_CONF_FSLSMODE_SHIFT;
+				reg |= OMAP_TLL_CHANNEL_CONF_CHANMODE_FSLS;
+			} else if (pdata->port_mode[i] ==
+					OMAP_EHCI_PORT_MODE_TLL) {
+				/*
+				 * Disable AutoIdle, BitStuffing
+				 * and use SDR Mode
+				 */
+				reg &= ~(OMAP_TLL_CHANNEL_CONF_UTMIAUTOIDLE
+					| OMAP_TLL_CHANNEL_CONF_ULPINOBITSTUFF
+					| OMAP_TLL_CHANNEL_CONF_ULPIDDRMODE);
+			} else if (pdata->port_mode[i] ==
+					OMAP_EHCI_PORT_MODE_HSIC) {
+				/*
+				 * HSIC Mode requires UTMI port configurations
+				 */
+				reg |= OMAP_TLL_CHANNEL_CONF_DRVVBUS
+				 | OMAP_TLL_CHANNEL_CONF_CHRGVBUS
+				 | OMAP_TLL_CHANNEL_CONF_MODE_TRANSPARENT_UTMI
+				 | OMAP_TLL_CHANNEL_CONF_ULPINOBITSTUFF;
+			} else {
+				continue;
+			}
+			reg |= OMAP_TLL_CHANNEL_CONF_CHANEN;
+			usbtll_write(base, OMAP_TLL_CHANNEL_CONF(i), reg);
+
+			usbtll_writeb(base,
+				      OMAP_TLL_ULPI_SCRATCH_REGISTER(i),
+				      0xbe);
+		}
+	}
+
+	spin_unlock(&tll_lock);
+	pm_runtime_put_sync(tll_dev);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(omap_tll_init);
+
+int omap_tll_enable(struct usbhs_omap_platform_data *pdata)
+{
+	int i;
+	struct usbtll_omap *tll;
+
+	if (!tll_dev)
+		return -ENODEV;
+
+	pm_runtime_get_sync(tll_dev);
+
+	spin_lock(&tll_lock);
+	tll = dev_get_drvdata(tll_dev);
+
+	for (i = 0; i < tll->nch; i++) {
+		if (omap_usb_mode_needs_tll(pdata->port_mode[i])) {
+			int r;
+
+			if (IS_ERR(tll->ch_clk[i]))
+				continue;
+
+			r = clk_prepare_enable(tll->ch_clk[i]);
+			if (r) {
+				dev_err(tll_dev,
+				 "Error enabling ch %d clock: %d\n", i, r);
+			}
+		}
+	}
+
+	spin_unlock(&tll_lock);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(omap_tll_enable);
+
+int omap_tll_disable(struct usbhs_omap_platform_data *pdata)
+{
+	int i;
+	struct usbtll_omap *tll;
+
+	if (!tll_dev)
+		return -ENODEV;
+
+	spin_lock(&tll_lock);
+	tll = dev_get_drvdata(tll_dev);
+
+	for (i = 0; i < tll->nch; i++) {
+		if (omap_usb_mode_needs_tll(pdata->port_mode[i])) {
+			if (!IS_ERR(tll->ch_clk[i]))
+				clk_disable_unprepare(tll->ch_clk[i]);
+		}
+	}
+
+	spin_unlock(&tll_lock);
+	pm_runtime_put_sync(tll_dev);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(omap_tll_disable);
+
+MODULE_AUTHOR("Keshava Munegowda <keshava_mgowda@ti.com>");
+MODULE_AUTHOR("Roger Quadros <rogerq@ti.com>");
+MODULE_ALIAS("platform:" USBHS_DRIVER_NAME);
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("usb tll driver for TI OMAP EHCI and OHCI controllers");
+
+static int __init omap_usbtll_drvinit(void)
+{
+	return platform_driver_register(&usbtll_omap_driver);
+}
+
+/*
+ * init before usbhs core driver;
+ * The usbtll driver should be initialized before
+ * the usbhs core driver probe function is called.
+ */
+fs_initcall(omap_usbtll_drvinit);
+
+static void __exit omap_usbtll_drvexit(void)
+{
+	platform_driver_unregister(&usbtll_omap_driver);
+}
+module_exit(omap_usbtll_drvexit);