usb: dwc3: TI PHY: PHY driver for dwc3 in TI platforms

Added a single driver for both USB2 PHY programming and USB3 PHY
programming.

USB3 PHY is taken from drivers/phy/phy-ti-pipe3.c in linux kernel.
commit 56042e : phy: ti-pipe3: Fix suspend/resume and module reload.

USB2 PHY is taken from drivers/phy/phy-omap-usb2.c in linux kernel.
commit eb82a3 : phy: omap-usb2: Balance pm_runtime_enable() on probe
failure and remove.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Reviewed-by: Lukasz Majewski <l.majewski@samsung.com>

1 files changed, 309 insertions, 0 deletions

diff --git a/drivers/usb/dwc3/ti_usb_phy.c b/drivers/usb/dwc3/ti_usb_phy.c
new file mode 100644
index 0000000000..e6048ebf02
--- /dev/null
+++ b/drivers/usb/dwc3/ti_usb_phy.c
@@ -0,0 +1,309 @@
+/**
+ * ti_usb_phy.c - USB3 and USB3 PHY programming for dwc3
+ *
+ * Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com
+ *
+ * Author: Kishon Vijay Abraham I <kishon@ti.com>
+ *
+ * Taken from Linux Kernel v3.16 (drivers/phy/phy-ti-pipe3.c and
+ * drivers/phy/phy-omap-usb2.c) and ported to uboot.
+ *
+ * "commit 56042e : phy: ti-pipe3: Fix suspend/resume and module reload" for
+ * phy-ti-pipe3.c
+ *
+ * "commit eb82a3 : phy: omap-usb2: Balance pm_runtime_enable() on probe failure
+ * and remove" for phy-omap-usb2.c
+ *
+ * SPDX-License-Identifier:     GPL-2.0+
+ */
+
+#include <common.h>
+#include <malloc.h>
+#include <ti-usb-phy-uboot.h>
+#include <usb/lin_gadget_compat.h>
+#include <linux/ioport.h>
+#include <asm/io.h>
+#include <asm/arch/sys_proto.h>
+
+#include "linux-compat.h"
+
+#define PLL_STATUS		0x00000004
+#define PLL_GO			0x00000008
+#define PLL_CONFIGURATION1	0x0000000C
+#define PLL_CONFIGURATION2	0x00000010
+#define PLL_CONFIGURATION3	0x00000014
+#define PLL_CONFIGURATION4	0x00000020
+
+#define PLL_REGM_MASK		0x001FFE00
+#define PLL_REGM_SHIFT		0x9
+#define PLL_REGM_F_MASK		0x0003FFFF
+#define PLL_REGM_F_SHIFT	0x0
+#define PLL_REGN_MASK		0x000001FE
+#define PLL_REGN_SHIFT		0x1
+#define PLL_SELFREQDCO_MASK	0x0000000E
+#define PLL_SELFREQDCO_SHIFT	0x1
+#define PLL_SD_MASK		0x0003FC00
+#define PLL_SD_SHIFT		10
+#define SET_PLL_GO		0x1
+#define PLL_LDOPWDN		BIT(15)
+#define PLL_TICOPWDN		BIT(16)
+#define PLL_LOCK		0x2
+#define PLL_IDLE		0x1
+
+#define OMAP_CTRL_DEV_PHY_PD				BIT(0)
+#define OMAP_CTRL_USB3_PHY_PWRCTL_CLK_CMD_MASK		0x003FC000
+#define OMAP_CTRL_USB3_PHY_PWRCTL_CLK_CMD_SHIFT		0xE
+
+#define OMAP_CTRL_USB3_PHY_PWRCTL_CLK_FREQ_MASK		0xFFC00000
+#define OMAP_CTRL_USB3_PHY_PWRCTL_CLK_FREQ_SHIFT	0x16
+
+#define OMAP_CTRL_USB3_PHY_TX_RX_POWERON	0x3
+#define OMAP_CTRL_USB3_PHY_TX_RX_POWEROFF	0x0
+
+#define OMAP_CTRL_USB2_PHY_PD			BIT(28)
+
+#define AM437X_CTRL_USB2_PHY_PD			BIT(0)
+#define AM437X_CTRL_USB2_OTG_PD			BIT(1)
+#define AM437X_CTRL_USB2_OTGVDET_EN		BIT(19)
+#define AM437X_CTRL_USB2_OTGSESSEND_EN		BIT(20)
+
+static LIST_HEAD(ti_usb_phy_list);
+typedef unsigned int u32;
+
+struct usb3_dpll_params {
+	u16	m;
+	u8	n;
+	u8	freq:3;
+	u8	sd;
+	u32	mf;
+};
+
+struct usb3_dpll_map {
+	unsigned long rate;
+	struct usb3_dpll_params params;
+	struct usb3_dpll_map *dpll_map;
+};
+
+struct ti_usb_phy {
+	void __iomem *pll_ctrl_base;
+	void __iomem *usb2_phy_power;
+	void __iomem *usb3_phy_power;
+	struct usb3_dpll_map *dpll_map;
+	struct list_head list;
+	int index;
+};
+
+static struct usb3_dpll_map dpll_map_usb[] = {
+	{12000000, {1250, 5, 4, 20, 0} },	/* 12 MHz */
+	{16800000, {3125, 20, 4, 20, 0} },	/* 16.8 MHz */
+	{19200000, {1172, 8, 4, 20, 65537} },	/* 19.2 MHz */
+	{20000000, {1000, 7, 4, 10, 0} },	/* 20 MHz */
+	{26000000, {1250, 12, 4, 20, 0} },	/* 26 MHz */
+	{38400000, {3125, 47, 4, 20, 92843} },	/* 38.4 MHz */
+	{ },					/* Terminator */
+};
+
+static inline unsigned int ti_usb3_readl(void __iomem *base, u32 offset)
+{
+	return readl(base + offset);
+}
+
+static inline void ti_usb3_writel(void __iomem *base, u32 offset, u32 value)
+{
+	writel(value, base + offset);
+}
+
+#ifndef CONFIG_AM43XX
+static struct usb3_dpll_params *ti_usb3_get_dpll_params(struct ti_usb_phy *phy)
+{
+	unsigned long rate;
+	struct usb3_dpll_map *dpll_map = phy->dpll_map;
+
+	rate = get_sys_clk_freq();
+
+	for (; dpll_map->rate; dpll_map++) {
+		if (rate == dpll_map->rate)
+			return &dpll_map->params;
+	}
+
+	dev_err(phy->dev, "No DPLL configuration for %lu Hz SYS CLK\n", rate);
+
+	return NULL;
+}
+
+static int ti_usb3_dpll_wait_lock(struct ti_usb_phy *phy)
+{
+	u32 val;
+	do {
+		val = ti_usb3_readl(phy->pll_ctrl_base, PLL_STATUS);
+			if (val & PLL_LOCK)
+				break;
+	} while (1);
+
+	return 0;
+}
+
+static int ti_usb3_dpll_program(struct ti_usb_phy *phy)
+{
+	u32			val;
+	struct usb3_dpll_params	*dpll_params;
+
+	if (!phy->pll_ctrl_base)
+		return -EINVAL;
+
+	dpll_params = ti_usb3_get_dpll_params(phy);
+	if (!dpll_params)
+		return -EINVAL;
+
+	val = ti_usb3_readl(phy->pll_ctrl_base, PLL_CONFIGURATION1);
+	val &= ~PLL_REGN_MASK;
+	val |= dpll_params->n << PLL_REGN_SHIFT;
+	ti_usb3_writel(phy->pll_ctrl_base, PLL_CONFIGURATION1, val);
+
+	val = ti_usb3_readl(phy->pll_ctrl_base, PLL_CONFIGURATION2);
+	val &= ~PLL_SELFREQDCO_MASK;
+	val |= dpll_params->freq << PLL_SELFREQDCO_SHIFT;
+	ti_usb3_writel(phy->pll_ctrl_base, PLL_CONFIGURATION2, val);
+
+	val = ti_usb3_readl(phy->pll_ctrl_base, PLL_CONFIGURATION1);
+	val &= ~PLL_REGM_MASK;
+	val |= dpll_params->m << PLL_REGM_SHIFT;
+	ti_usb3_writel(phy->pll_ctrl_base, PLL_CONFIGURATION1, val);
+
+	val = ti_usb3_readl(phy->pll_ctrl_base, PLL_CONFIGURATION4);
+	val &= ~PLL_REGM_F_MASK;
+	val |= dpll_params->mf << PLL_REGM_F_SHIFT;
+	ti_usb3_writel(phy->pll_ctrl_base, PLL_CONFIGURATION4, val);
+
+	val = ti_usb3_readl(phy->pll_ctrl_base, PLL_CONFIGURATION3);
+	val &= ~PLL_SD_MASK;
+	val |= dpll_params->sd << PLL_SD_SHIFT;
+	ti_usb3_writel(phy->pll_ctrl_base, PLL_CONFIGURATION3, val);
+
+	ti_usb3_writel(phy->pll_ctrl_base, PLL_GO, SET_PLL_GO);
+
+	return ti_usb3_dpll_wait_lock(phy);
+}
+#endif
+
+void ti_usb2_phy_power(struct ti_usb_phy *phy, int on)
+{
+	u32 val;
+
+	val = readl(phy->usb2_phy_power);
+
+	if (on) {
+#ifdef CONFIG_DRA7XX
+		val &= ~OMAP_CTRL_DEV_PHY_PD;
+#elif defined(CONFIG_AM43XX)
+		val &= ~(AM437X_CTRL_USB2_PHY_PD |
+			 AM437X_CTRL_USB2_OTG_PD);
+		val |= (AM437X_CTRL_USB2_OTGVDET_EN |
+			AM437X_CTRL_USB2_OTGSESSEND_EN);
+#endif
+	} else {
+#ifdef CONFIG_DRA7XX
+		val |= OMAP_CTRL_DEV_PHY_PD;
+#elif defined(CONFIG_AM43XX)
+		val &= ~(AM437X_CTRL_USB2_OTGVDET_EN |
+			 AM437X_CTRL_USB2_OTGSESSEND_EN);
+		val |= (AM437X_CTRL_USB2_PHY_PD |
+			AM437X_CTRL_USB2_OTG_PD);
+#endif
+	}
+	writel(val, phy->usb2_phy_power);
+}
+
+#ifndef CONFIG_AM43XX
+void ti_usb3_phy_power(struct ti_usb_phy *phy, int on)
+{
+	u32 val;
+	u32 rate;
+	rate = get_sys_clk_freq();
+	rate = rate/1000000;
+
+	if (!phy->usb3_phy_power)
+		return;
+
+	val = readl(phy->usb3_phy_power);
+	if (on) {
+		val &= ~(OMAP_CTRL_USB3_PHY_PWRCTL_CLK_CMD_MASK |
+			OMAP_CTRL_USB3_PHY_PWRCTL_CLK_FREQ_MASK);
+		val |= (OMAP_CTRL_USB3_PHY_TX_RX_POWERON) <<
+			OMAP_CTRL_USB3_PHY_PWRCTL_CLK_CMD_SHIFT;
+		val |= rate <<
+			OMAP_CTRL_USB3_PHY_PWRCTL_CLK_FREQ_SHIFT;
+	} else {
+		val &= ~OMAP_CTRL_USB3_PHY_PWRCTL_CLK_CMD_MASK;
+		val |= OMAP_CTRL_USB3_PHY_TX_RX_POWEROFF <<
+			OMAP_CTRL_USB3_PHY_PWRCTL_CLK_CMD_SHIFT;
+	}
+	writel(val, phy->usb3_phy_power);
+}
+#endif
+
+/**
+ * ti_usb_phy_uboot_init - usb phy uboot initialization code
+ * @dev: struct ti_usb_phy_device containing initialization data
+ *
+ * Entry point for ti usb phy driver. This driver handles initialization
+ * of both usb2 phy and usb3 phy. Pointer to ti_usb_phy_device should be
+ * passed containing base address and other initialization data.
+ * Returns '0' on success and a negative value on failure.
+ *
+ * Generally called from board_usb_init() implemented in board file.
+ */
+int ti_usb_phy_uboot_init(struct ti_usb_phy_device *dev)
+{
+	struct ti_usb_phy *phy;
+
+	phy = devm_kzalloc(NULL, sizeof(*phy), GFP_KERNEL);
+	if (!phy) {
+		dev_err(NULL, "unable to alloc mem for TI USB3 PHY\n");
+		return -ENOMEM;
+	}
+
+	phy->dpll_map = dpll_map_usb;
+	phy->index = dev->index;
+	phy->pll_ctrl_base = dev->pll_ctrl_base;
+	phy->usb2_phy_power = dev->usb2_phy_power;
+	phy->usb3_phy_power = dev->usb3_phy_power;
+
+#ifndef CONFIG_AM43XX
+	ti_usb3_dpll_program(phy);
+	ti_usb3_phy_power(phy, 1);
+#endif
+	ti_usb2_phy_power(phy, 1);
+	mdelay(150);
+	list_add_tail(&phy->list, &ti_usb_phy_list);
+
+	return 0;
+}
+
+/**
+ * ti_usb_phy_uboot_exit - usb phy uboot cleanup code
+ * @index: index of this controller
+ *
+ * Performs cleanup of memory allocated in ti_usb_phy_uboot_init.
+ * index of _this_ controller should be passed and should match with
+ * the index passed in ti_usb_phy_device during init.
+ *
+ * Generally called from board file.
+ */
+void ti_usb_phy_uboot_exit(int index)
+{
+	struct ti_usb_phy *phy = NULL;
+
+	list_for_each_entry(phy, &ti_usb_phy_list, list) {
+		if (phy->index != index)
+			continue;
+
+		ti_usb2_phy_power(phy, 0);
+#ifndef CONFIG_AM43XX
+		ti_usb3_phy_power(phy, 0);
+#endif
+		list_del(&phy->list);
+		kfree(phy);
+		break;
+	}
+}