[U-Boot] [u-boot 29/40] usb: dwc3: TI PHY: PHY driver for dwc3 in TI platforms

Kishon Vijay Abraham I
2015-02-06T08:48:06Z

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>
---
drivers/usb/dwc3/ti_usb_phy.c | 309 +++++++++++++++++++++++++++++++++++++++++
include/ti-usb-phy-uboot.h | 22 +++
2 files changed, 331 insertions(+)
create mode 100644 drivers/usb/dwc3/ti_usb_phy.c
create mode 100644 include/ti-usb-phy-uboot.h

diff --git a/drivers/usb/dwc3/ti_usb_phy.c b/drivers/usb/dwc3/ti_usb_phy.c
new file mode 100644
index 0000000..e6048eb
--- /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;
+ }
+}
diff --git a/include/ti-usb-phy-uboot.h b/include/ti-usb-phy-uboot.h
new file mode 100644
index 0000000..93f7101
--- /dev/null
+++ b/include/ti-usb-phy-uboot.h
@@ -0,0 +1,22 @@
+/* include/ti_usb_phy_uboot.h
+ *
+ * Copyright (c) 2014 Texas Instruments Incorporated - http://www.ti.com
+ *
+ * USB2 and USB3 PHY uboot init
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#ifndef __TI_USB_PHY_UBOOT_H_
+#define __TI_USB_PHY_UBOOT_H_
+
+struct ti_usb_phy_device {
+ void *pll_ctrl_base;
+ void *usb2_phy_power;
+ void *usb3_phy_power;
+ int index;
+};
+
+int ti_usb_phy_uboot_init(struct ti_usb_phy_device *dev);
+void ti_usb_phy_uboot_exit(int index);
+#endif /* __TI_USB_PHY_UBOOT_H_ */
--
1.7.9.5