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path: root/drivers/usb/phy/phy-tegra-usb.c
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Diffstat (limited to 'drivers/usb/phy/phy-tegra-usb.c')
-rw-r--r--drivers/usb/phy/phy-tegra-usb.c354
1 files changed, 229 insertions, 125 deletions
diff --git a/drivers/usb/phy/phy-tegra-usb.c b/drivers/usb/phy/phy-tegra-usb.c
index 17d811292f3a..cec0855ed248 100644
--- a/drivers/usb/phy/phy-tegra-usb.c
+++ b/drivers/usb/phy/phy-tegra-usb.c
@@ -1,9 +1,11 @@
/*
* Copyright (C) 2010 Google, Inc.
+ * Copyright (C) 2013 NVIDIA Corporation
*
* Author:
* Erik Gilling <konkers@google.com>
* Benoit Goby <benoit@android.com>
+ * Venu Byravarasu <vbyravarasu@nvidia.com>
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
@@ -21,6 +23,7 @@
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/export.h>
+#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/gpio.h>
@@ -29,13 +32,19 @@
#include <linux/usb/otg.h>
#include <linux/usb/ulpi.h>
#include <asm/mach-types.h>
+#include <linux/usb/ehci_def.h>
#include <linux/usb/tegra_usb_phy.h>
-#define TEGRA_USB_BASE 0xC5000000
-#define TEGRA_USB_SIZE SZ_16K
-
#define ULPI_VIEWPORT 0x170
+/* PORTSC registers */
+#define TEGRA_USB_PORTSC1 0x184
+#define TEGRA_USB_PORTSC1_PTS(x) (((x) & 0x3) << 30)
+#define TEGRA_USB_PORTSC1_PHCD (1 << 23)
+
+/* Bits of PORTSC1, which will get cleared by writing 1 into them */
+#define TEGRA_PORTSC1_RWC_BITS (PORT_CSC | PORT_PEC | PORT_OCC)
+
#define USB_SUSP_CTRL 0x400
#define USB_WAKE_ON_CNNT_EN_DEV (1 << 3)
#define USB_WAKE_ON_DISCON_EN_DEV (1 << 4)
@@ -196,34 +205,41 @@ static struct tegra_utmip_config utmip_default[] = {
},
};
+static void set_pts(struct tegra_usb_phy *phy, u8 pts_val)
+{
+ void __iomem *base = phy->regs;
+ unsigned long val;
+
+ val = readl(base + TEGRA_USB_PORTSC1) & ~TEGRA_PORTSC1_RWC_BITS;
+ val &= ~TEGRA_USB_PORTSC1_PTS(3);
+ val |= TEGRA_USB_PORTSC1_PTS(pts_val & 3);
+ writel(val, base + TEGRA_USB_PORTSC1);
+}
+
+static void set_phcd(struct tegra_usb_phy *phy, bool enable)
+{
+ void __iomem *base = phy->regs;
+ unsigned long val;
+
+ val = readl(base + TEGRA_USB_PORTSC1) & ~TEGRA_PORTSC1_RWC_BITS;
+ if (enable)
+ val |= TEGRA_USB_PORTSC1_PHCD;
+ else
+ val &= ~TEGRA_USB_PORTSC1_PHCD;
+ writel(val, base + TEGRA_USB_PORTSC1);
+}
+
static int utmip_pad_open(struct tegra_usb_phy *phy)
{
- phy->pad_clk = clk_get_sys("utmip-pad", NULL);
+ phy->pad_clk = devm_clk_get(phy->dev, "utmi-pads");
if (IS_ERR(phy->pad_clk)) {
pr_err("%s: can't get utmip pad clock\n", __func__);
return PTR_ERR(phy->pad_clk);
}
- if (phy->is_legacy_phy) {
- phy->pad_regs = phy->regs;
- } else {
- phy->pad_regs = ioremap(TEGRA_USB_BASE, TEGRA_USB_SIZE);
- if (!phy->pad_regs) {
- pr_err("%s: can't remap usb registers\n", __func__);
- clk_put(phy->pad_clk);
- return -ENOMEM;
- }
- }
return 0;
}
-static void utmip_pad_close(struct tegra_usb_phy *phy)
-{
- if (!phy->is_legacy_phy)
- iounmap(phy->pad_regs);
- clk_put(phy->pad_clk);
-}
-
static void utmip_pad_power_on(struct tegra_usb_phy *phy)
{
unsigned long val, flags;
@@ -299,7 +315,7 @@ static void utmi_phy_clk_disable(struct tegra_usb_phy *phy)
val &= ~USB_SUSP_SET;
writel(val, base + USB_SUSP_CTRL);
} else
- phy->set_phcd(&phy->u_phy, true);
+ set_phcd(phy, true);
if (utmi_wait_register(base + USB_SUSP_CTRL, USB_PHY_CLK_VALID, 0) < 0)
pr_err("%s: timeout waiting for phy to stabilize\n", __func__);
@@ -321,7 +337,7 @@ static void utmi_phy_clk_enable(struct tegra_usb_phy *phy)
val &= ~USB_SUSP_CLR;
writel(val, base + USB_SUSP_CTRL);
} else
- phy->set_phcd(&phy->u_phy, false);
+ set_phcd(phy, false);
if (utmi_wait_register(base + USB_SUSP_CTRL, USB_PHY_CLK_VALID,
USB_PHY_CLK_VALID))
@@ -444,7 +460,7 @@ static int utmi_phy_power_on(struct tegra_usb_phy *phy)
utmi_phy_clk_enable(phy);
if (!phy->is_legacy_phy)
- phy->set_pts(&phy->u_phy, 0);
+ set_pts(phy, 0);
return 0;
}
@@ -541,11 +557,18 @@ static int ulpi_phy_power_on(struct tegra_usb_phy *phy)
int ret;
unsigned long val;
void __iomem *base = phy->regs;
- struct tegra_ulpi_config *config = phy->config;
- gpio_direction_output(config->reset_gpio, 0);
+ ret = gpio_direction_output(phy->reset_gpio, 0);
+ if (ret < 0) {
+ dev_err(phy->dev, "gpio %d not set to 0\n", phy->reset_gpio);
+ return ret;
+ }
msleep(5);
- gpio_direction_output(config->reset_gpio, 1);
+ ret = gpio_direction_output(phy->reset_gpio, 1);
+ if (ret < 0) {
+ dev_err(phy->dev, "gpio %d not set to 1\n", phy->reset_gpio);
+ return ret;
+ }
clk_prepare_enable(phy->clk);
msleep(1);
@@ -603,63 +626,15 @@ static int ulpi_phy_power_on(struct tegra_usb_phy *phy)
static int ulpi_phy_power_off(struct tegra_usb_phy *phy)
{
- struct tegra_ulpi_config *config = phy->config;
-
clk_disable(phy->clk);
- return gpio_direction_output(config->reset_gpio, 0);
-}
-
-static int tegra_phy_init(struct usb_phy *x)
-{
- struct tegra_usb_phy *phy = container_of(x, struct tegra_usb_phy, u_phy);
- struct tegra_ulpi_config *ulpi_config;
- int err;
-
- if (phy->is_ulpi_phy) {
- ulpi_config = phy->config;
- phy->clk = clk_get_sys(NULL, ulpi_config->clk);
- if (IS_ERR(phy->clk)) {
- pr_err("%s: can't get ulpi clock\n", __func__);
- err = -ENXIO;
- goto err1;
- }
- if (!gpio_is_valid(ulpi_config->reset_gpio))
- ulpi_config->reset_gpio =
- of_get_named_gpio(phy->dev->of_node,
- "nvidia,phy-reset-gpio", 0);
- if (!gpio_is_valid(ulpi_config->reset_gpio)) {
- pr_err("%s: invalid reset gpio: %d\n", __func__,
- ulpi_config->reset_gpio);
- err = -EINVAL;
- goto err1;
- }
- gpio_request(ulpi_config->reset_gpio, "ulpi_phy_reset_b");
- gpio_direction_output(ulpi_config->reset_gpio, 0);
- phy->ulpi = otg_ulpi_create(&ulpi_viewport_access_ops, 0);
- phy->ulpi->io_priv = phy->regs + ULPI_VIEWPORT;
- } else {
- err = utmip_pad_open(phy);
- if (err < 0)
- goto err1;
- }
- return 0;
-err1:
- clk_disable_unprepare(phy->pll_u);
- clk_put(phy->pll_u);
- return err;
+ return gpio_direction_output(phy->reset_gpio, 0);
}
static void tegra_usb_phy_close(struct usb_phy *x)
{
struct tegra_usb_phy *phy = container_of(x, struct tegra_usb_phy, u_phy);
- if (phy->is_ulpi_phy)
- clk_put(phy->clk);
- else
- utmip_pad_close(phy);
clk_disable_unprepare(phy->pll_u);
- clk_put(phy->pll_u);
- kfree(phy);
}
static int tegra_usb_phy_power_on(struct tegra_usb_phy *phy)
@@ -687,54 +662,63 @@ static int tegra_usb_phy_suspend(struct usb_phy *x, int suspend)
return tegra_usb_phy_power_on(phy);
}
-struct tegra_usb_phy *tegra_usb_phy_open(struct device *dev, int instance,
- void __iomem *regs, void *config, enum tegra_usb_phy_mode phy_mode,
- void (*set_pts)(struct usb_phy *x, u8 pts_val),
- void (*set_phcd)(struct usb_phy *x, bool enable))
+static int ulpi_open(struct tegra_usb_phy *phy)
+{
+ int err;
+
+ phy->clk = devm_clk_get(phy->dev, "ulpi-link");
+ if (IS_ERR(phy->clk)) {
+ pr_err("%s: can't get ulpi clock\n", __func__);
+ return PTR_ERR(phy->clk);
+ }
+
+ err = devm_gpio_request(phy->dev, phy->reset_gpio, "ulpi_phy_reset_b");
+ if (err < 0) {
+ dev_err(phy->dev, "request failed for gpio: %d\n",
+ phy->reset_gpio);
+ return err;
+ }
+
+ err = gpio_direction_output(phy->reset_gpio, 0);
+ if (err < 0) {
+ dev_err(phy->dev, "gpio %d direction not set to output\n",
+ phy->reset_gpio);
+ return err;
+ }
+
+ phy->ulpi = otg_ulpi_create(&ulpi_viewport_access_ops, 0);
+ if (!phy->ulpi) {
+ dev_err(phy->dev, "otg_ulpi_create returned NULL\n");
+ err = -ENOMEM;
+ return err;
+ }
+
+ phy->ulpi->io_priv = phy->regs + ULPI_VIEWPORT;
+ return 0;
+}
+static int tegra_usb_phy_init(struct tegra_usb_phy *phy)
{
- struct tegra_usb_phy *phy;
unsigned long parent_rate;
int i;
int err;
- struct device_node *np = dev->of_node;
-
- phy = kzalloc(sizeof(struct tegra_usb_phy), GFP_KERNEL);
- if (!phy)
- return ERR_PTR(-ENOMEM);
-
- phy->instance = instance;
- phy->regs = regs;
- phy->config = config;
- phy->mode = phy_mode;
- phy->dev = dev;
- phy->is_legacy_phy =
- of_property_read_bool(np, "nvidia,has-legacy-mode");
- phy->set_pts = set_pts;
- phy->set_phcd = set_phcd;
- err = of_property_match_string(np, "phy_type", "ulpi");
- if (err < 0)
- phy->is_ulpi_phy = false;
- else
- phy->is_ulpi_phy = true;
-
- if (!phy->config) {
- if (phy->is_ulpi_phy) {
- pr_err("%s: ulpi phy configuration missing", __func__);
- err = -EINVAL;
- goto err0;
- } else {
- phy->config = &utmip_default[instance];
- }
+
+ if (!phy->is_ulpi_phy) {
+ if (phy->is_legacy_phy)
+ phy->config = &utmip_default[0];
+ else
+ phy->config = &utmip_default[2];
}
- phy->pll_u = clk_get_sys(NULL, "pll_u");
+ phy->pll_u = devm_clk_get(phy->dev, "pll_u");
if (IS_ERR(phy->pll_u)) {
pr_err("Can't get pll_u clock\n");
- err = PTR_ERR(phy->pll_u);
- goto err0;
+ return PTR_ERR(phy->pll_u);
}
- clk_prepare_enable(phy->pll_u);
+
+ err = clk_prepare_enable(phy->pll_u);
+ if (err)
+ return err;
parent_rate = clk_get_rate(clk_get_parent(phy->pll_u));
for (i = 0; i < ARRAY_SIZE(tegra_freq_table); i++) {
@@ -746,23 +730,22 @@ struct tegra_usb_phy *tegra_usb_phy_open(struct device *dev, int instance,
if (!phy->freq) {
pr_err("invalid pll_u parent rate %ld\n", parent_rate);
err = -EINVAL;
- goto err1;
+ goto fail;
}
- phy->u_phy.init = tegra_phy_init;
- phy->u_phy.shutdown = tegra_usb_phy_close;
- phy->u_phy.set_suspend = tegra_usb_phy_suspend;
+ if (phy->is_ulpi_phy)
+ err = ulpi_open(phy);
+ else
+ err = utmip_pad_open(phy);
+ if (err < 0)
+ goto fail;
- return phy;
+ return 0;
-err1:
+fail:
clk_disable_unprepare(phy->pll_u);
- clk_put(phy->pll_u);
-err0:
- kfree(phy);
- return ERR_PTR(err);
+ return err;
}
-EXPORT_SYMBOL_GPL(tegra_usb_phy_open);
void tegra_usb_phy_preresume(struct usb_phy *x)
{
@@ -801,3 +784,124 @@ void tegra_ehci_phy_restore_end(struct usb_phy *x)
}
EXPORT_SYMBOL_GPL(tegra_ehci_phy_restore_end);
+static int tegra_usb_phy_probe(struct platform_device *pdev)
+{
+ struct resource *res;
+ struct tegra_usb_phy *tegra_phy = NULL;
+ struct device_node *np = pdev->dev.of_node;
+ int err;
+
+ tegra_phy = devm_kzalloc(&pdev->dev, sizeof(*tegra_phy), GFP_KERNEL);
+ if (!tegra_phy) {
+ dev_err(&pdev->dev, "unable to allocate memory for USB2 PHY\n");
+ return -ENOMEM;
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(&pdev->dev, "Failed to get I/O memory\n");
+ return -ENXIO;
+ }
+
+ tegra_phy->regs = devm_ioremap(&pdev->dev, res->start,
+ resource_size(res));
+ if (!tegra_phy->regs) {
+ dev_err(&pdev->dev, "Failed to remap I/O memory\n");
+ return -ENOMEM;
+ }
+
+ tegra_phy->is_legacy_phy =
+ of_property_read_bool(np, "nvidia,has-legacy-mode");
+
+ err = of_property_match_string(np, "phy_type", "ulpi");
+ if (err < 0) {
+ tegra_phy->is_ulpi_phy = false;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ if (!res) {
+ dev_err(&pdev->dev, "Failed to get UTMI Pad regs\n");
+ return -ENXIO;
+ }
+
+ tegra_phy->pad_regs = devm_ioremap(&pdev->dev, res->start,
+ resource_size(res));
+ if (!tegra_phy->regs) {
+ dev_err(&pdev->dev, "Failed to remap UTMI Pad regs\n");
+ return -ENOMEM;
+ }
+ } else {
+ tegra_phy->is_ulpi_phy = true;
+
+ tegra_phy->reset_gpio =
+ of_get_named_gpio(np, "nvidia,phy-reset-gpio", 0);
+ if (!gpio_is_valid(tegra_phy->reset_gpio)) {
+ dev_err(&pdev->dev, "invalid gpio: %d\n",
+ tegra_phy->reset_gpio);
+ return tegra_phy->reset_gpio;
+ }
+ }
+
+ err = of_property_match_string(np, "dr_mode", "otg");
+ if (err < 0) {
+ err = of_property_match_string(np, "dr_mode", "peripheral");
+ if (err < 0)
+ tegra_phy->mode = TEGRA_USB_PHY_MODE_HOST;
+ else
+ tegra_phy->mode = TEGRA_USB_PHY_MODE_DEVICE;
+ } else
+ tegra_phy->mode = TEGRA_USB_PHY_MODE_OTG;
+
+ tegra_phy->dev = &pdev->dev;
+ err = tegra_usb_phy_init(tegra_phy);
+ if (err < 0)
+ return err;
+
+ tegra_phy->u_phy.shutdown = tegra_usb_phy_close;
+ tegra_phy->u_phy.set_suspend = tegra_usb_phy_suspend;
+
+ dev_set_drvdata(&pdev->dev, tegra_phy);
+ return 0;
+}
+
+static struct of_device_id tegra_usb_phy_id_table[] = {
+ { .compatible = "nvidia,tegra20-usb-phy", },
+ { },
+};
+MODULE_DEVICE_TABLE(of, tegra_usb_phy_id_table);
+
+static struct platform_driver tegra_usb_phy_driver = {
+ .probe = tegra_usb_phy_probe,
+ .driver = {
+ .name = "tegra-phy",
+ .owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(tegra_usb_phy_id_table),
+ },
+};
+module_platform_driver(tegra_usb_phy_driver);
+
+static int tegra_usb_phy_match(struct device *dev, void *data)
+{
+ struct tegra_usb_phy *tegra_phy = dev_get_drvdata(dev);
+ struct device_node *dn = data;
+
+ return (tegra_phy->dev->of_node == dn) ? 1 : 0;
+}
+
+struct usb_phy *tegra_usb_get_phy(struct device_node *dn)
+{
+ struct device *dev;
+ struct tegra_usb_phy *tegra_phy;
+
+ dev = driver_find_device(&tegra_usb_phy_driver.driver, NULL, dn,
+ tegra_usb_phy_match);
+ if (!dev)
+ return ERR_PTR(-EPROBE_DEFER);
+
+ tegra_phy = dev_get_drvdata(dev);
+
+ return &tegra_phy->u_phy;
+}
+EXPORT_SYMBOL_GPL(tegra_usb_get_phy);
+
+MODULE_DESCRIPTION("Tegra USB PHY driver");
+MODULE_LICENSE("GPL v2");