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path: root/drivers/phy/rockchip/phy-rockchip-usb.c
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Diffstat (limited to 'drivers/phy/rockchip/phy-rockchip-usb.c')
-rw-r--r--drivers/phy/rockchip/phy-rockchip-usb.c540
1 files changed, 540 insertions, 0 deletions
diff --git a/drivers/phy/rockchip/phy-rockchip-usb.c b/drivers/phy/rockchip/phy-rockchip-usb.c
new file mode 100644
index 000000000000..3378eeb7a562
--- /dev/null
+++ b/drivers/phy/rockchip/phy-rockchip-usb.c
@@ -0,0 +1,540 @@
+/*
+ * Rockchip usb PHY driver
+ *
+ * Copyright (C) 2014 Yunzhi Li <lyz@rock-chips.com>
+ * Copyright (C) 2014 ROCKCHIP, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License.
+ *
+ * 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.
+ */
+
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
+#include <linux/reset.h>
+#include <linux/regmap.h>
+#include <linux/mfd/syscon.h>
+#include <linux/delay.h>
+
+static int enable_usb_uart;
+
+#define HIWORD_UPDATE(val, mask) \
+ ((val) | (mask) << 16)
+
+#define UOC_CON0_SIDDQ BIT(13)
+
+struct rockchip_usb_phys {
+ int reg;
+ const char *pll_name;
+};
+
+struct rockchip_usb_phy_base;
+struct rockchip_usb_phy_pdata {
+ struct rockchip_usb_phys *phys;
+ int (*init_usb_uart)(struct regmap *grf);
+ int usb_uart_phy;
+};
+
+struct rockchip_usb_phy_base {
+ struct device *dev;
+ struct regmap *reg_base;
+ const struct rockchip_usb_phy_pdata *pdata;
+};
+
+struct rockchip_usb_phy {
+ struct rockchip_usb_phy_base *base;
+ struct device_node *np;
+ unsigned int reg_offset;
+ struct clk *clk;
+ struct clk *clk480m;
+ struct clk_hw clk480m_hw;
+ struct phy *phy;
+ bool uart_enabled;
+ struct reset_control *reset;
+ struct regulator *vbus;
+};
+
+static int rockchip_usb_phy_power(struct rockchip_usb_phy *phy,
+ bool siddq)
+{
+ u32 val = HIWORD_UPDATE(siddq ? UOC_CON0_SIDDQ : 0, UOC_CON0_SIDDQ);
+
+ return regmap_write(phy->base->reg_base, phy->reg_offset, val);
+}
+
+static unsigned long rockchip_usb_phy480m_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ return 480000000;
+}
+
+static void rockchip_usb_phy480m_disable(struct clk_hw *hw)
+{
+ struct rockchip_usb_phy *phy = container_of(hw,
+ struct rockchip_usb_phy,
+ clk480m_hw);
+
+ if (phy->vbus)
+ regulator_disable(phy->vbus);
+
+ /* Power down usb phy analog blocks by set siddq 1 */
+ rockchip_usb_phy_power(phy, 1);
+}
+
+static int rockchip_usb_phy480m_enable(struct clk_hw *hw)
+{
+ struct rockchip_usb_phy *phy = container_of(hw,
+ struct rockchip_usb_phy,
+ clk480m_hw);
+
+ /* Power up usb phy analog blocks by set siddq 0 */
+ return rockchip_usb_phy_power(phy, 0);
+}
+
+static int rockchip_usb_phy480m_is_enabled(struct clk_hw *hw)
+{
+ struct rockchip_usb_phy *phy = container_of(hw,
+ struct rockchip_usb_phy,
+ clk480m_hw);
+ int ret;
+ u32 val;
+
+ ret = regmap_read(phy->base->reg_base, phy->reg_offset, &val);
+ if (ret < 0)
+ return ret;
+
+ return (val & UOC_CON0_SIDDQ) ? 0 : 1;
+}
+
+static const struct clk_ops rockchip_usb_phy480m_ops = {
+ .enable = rockchip_usb_phy480m_enable,
+ .disable = rockchip_usb_phy480m_disable,
+ .is_enabled = rockchip_usb_phy480m_is_enabled,
+ .recalc_rate = rockchip_usb_phy480m_recalc_rate,
+};
+
+static int rockchip_usb_phy_power_off(struct phy *_phy)
+{
+ struct rockchip_usb_phy *phy = phy_get_drvdata(_phy);
+
+ if (phy->uart_enabled)
+ return -EBUSY;
+
+ clk_disable_unprepare(phy->clk480m);
+
+ return 0;
+}
+
+static int rockchip_usb_phy_power_on(struct phy *_phy)
+{
+ struct rockchip_usb_phy *phy = phy_get_drvdata(_phy);
+
+ if (phy->uart_enabled)
+ return -EBUSY;
+
+ if (phy->vbus) {
+ int ret;
+
+ ret = regulator_enable(phy->vbus);
+ if (ret)
+ return ret;
+ }
+
+ return clk_prepare_enable(phy->clk480m);
+}
+
+static int rockchip_usb_phy_reset(struct phy *_phy)
+{
+ struct rockchip_usb_phy *phy = phy_get_drvdata(_phy);
+
+ if (phy->reset) {
+ reset_control_assert(phy->reset);
+ udelay(10);
+ reset_control_deassert(phy->reset);
+ }
+
+ return 0;
+}
+
+static const struct phy_ops ops = {
+ .power_on = rockchip_usb_phy_power_on,
+ .power_off = rockchip_usb_phy_power_off,
+ .reset = rockchip_usb_phy_reset,
+ .owner = THIS_MODULE,
+};
+
+static void rockchip_usb_phy_action(void *data)
+{
+ struct rockchip_usb_phy *rk_phy = data;
+
+ if (!rk_phy->uart_enabled) {
+ of_clk_del_provider(rk_phy->np);
+ clk_unregister(rk_phy->clk480m);
+ }
+
+ if (rk_phy->clk)
+ clk_put(rk_phy->clk);
+}
+
+static int rockchip_usb_phy_init(struct rockchip_usb_phy_base *base,
+ struct device_node *child)
+{
+ struct rockchip_usb_phy *rk_phy;
+ unsigned int reg_offset;
+ const char *clk_name;
+ struct clk_init_data init;
+ int err, i;
+
+ rk_phy = devm_kzalloc(base->dev, sizeof(*rk_phy), GFP_KERNEL);
+ if (!rk_phy)
+ return -ENOMEM;
+
+ rk_phy->base = base;
+ rk_phy->np = child;
+
+ if (of_property_read_u32(child, "reg", &reg_offset)) {
+ dev_err(base->dev, "missing reg property in node %s\n",
+ child->name);
+ return -EINVAL;
+ }
+
+ rk_phy->reset = of_reset_control_get(child, "phy-reset");
+ if (IS_ERR(rk_phy->reset))
+ rk_phy->reset = NULL;
+
+ rk_phy->reg_offset = reg_offset;
+
+ rk_phy->clk = of_clk_get_by_name(child, "phyclk");
+ if (IS_ERR(rk_phy->clk))
+ rk_phy->clk = NULL;
+
+ i = 0;
+ init.name = NULL;
+ while (base->pdata->phys[i].reg) {
+ if (base->pdata->phys[i].reg == reg_offset) {
+ init.name = base->pdata->phys[i].pll_name;
+ break;
+ }
+ i++;
+ }
+
+ if (!init.name) {
+ dev_err(base->dev, "phy data not found\n");
+ return -EINVAL;
+ }
+
+ if (enable_usb_uart && base->pdata->usb_uart_phy == i) {
+ dev_dbg(base->dev, "phy%d used as uart output\n", i);
+ rk_phy->uart_enabled = true;
+ } else {
+ if (rk_phy->clk) {
+ clk_name = __clk_get_name(rk_phy->clk);
+ init.flags = 0;
+ init.parent_names = &clk_name;
+ init.num_parents = 1;
+ } else {
+ init.flags = 0;
+ init.parent_names = NULL;
+ init.num_parents = 0;
+ }
+
+ init.ops = &rockchip_usb_phy480m_ops;
+ rk_phy->clk480m_hw.init = &init;
+
+ rk_phy->clk480m = clk_register(base->dev, &rk_phy->clk480m_hw);
+ if (IS_ERR(rk_phy->clk480m)) {
+ err = PTR_ERR(rk_phy->clk480m);
+ goto err_clk;
+ }
+
+ err = of_clk_add_provider(child, of_clk_src_simple_get,
+ rk_phy->clk480m);
+ if (err < 0)
+ goto err_clk_prov;
+ }
+
+ err = devm_add_action_or_reset(base->dev, rockchip_usb_phy_action,
+ rk_phy);
+ if (err)
+ return err;
+
+ rk_phy->phy = devm_phy_create(base->dev, child, &ops);
+ if (IS_ERR(rk_phy->phy)) {
+ dev_err(base->dev, "failed to create PHY\n");
+ return PTR_ERR(rk_phy->phy);
+ }
+ phy_set_drvdata(rk_phy->phy, rk_phy);
+
+ rk_phy->vbus = devm_regulator_get_optional(&rk_phy->phy->dev, "vbus");
+ if (IS_ERR(rk_phy->vbus)) {
+ if (PTR_ERR(rk_phy->vbus) == -EPROBE_DEFER)
+ return PTR_ERR(rk_phy->vbus);
+ rk_phy->vbus = NULL;
+ }
+
+ /*
+ * When acting as uart-pipe, just keep clock on otherwise
+ * only power up usb phy when it use, so disable it when init
+ */
+ if (rk_phy->uart_enabled)
+ return clk_prepare_enable(rk_phy->clk);
+ else
+ return rockchip_usb_phy_power(rk_phy, 1);
+
+err_clk_prov:
+ if (!rk_phy->uart_enabled)
+ clk_unregister(rk_phy->clk480m);
+err_clk:
+ if (rk_phy->clk)
+ clk_put(rk_phy->clk);
+ return err;
+}
+
+static const struct rockchip_usb_phy_pdata rk3066a_pdata = {
+ .phys = (struct rockchip_usb_phys[]){
+ { .reg = 0x17c, .pll_name = "sclk_otgphy0_480m" },
+ { .reg = 0x188, .pll_name = "sclk_otgphy1_480m" },
+ { /* sentinel */ }
+ },
+};
+
+static const struct rockchip_usb_phy_pdata rk3188_pdata = {
+ .phys = (struct rockchip_usb_phys[]){
+ { .reg = 0x10c, .pll_name = "sclk_otgphy0_480m" },
+ { .reg = 0x11c, .pll_name = "sclk_otgphy1_480m" },
+ { /* sentinel */ }
+ },
+};
+
+#define RK3288_UOC0_CON0 0x320
+#define RK3288_UOC0_CON0_COMMON_ON_N BIT(0)
+#define RK3288_UOC0_CON0_DISABLE BIT(4)
+
+#define RK3288_UOC0_CON2 0x328
+#define RK3288_UOC0_CON2_SOFT_CON_SEL BIT(2)
+
+#define RK3288_UOC0_CON3 0x32c
+#define RK3288_UOC0_CON3_UTMI_SUSPENDN BIT(0)
+#define RK3288_UOC0_CON3_UTMI_OPMODE_NODRIVING (1 << 1)
+#define RK3288_UOC0_CON3_UTMI_OPMODE_MASK (3 << 1)
+#define RK3288_UOC0_CON3_UTMI_XCVRSEELCT_FSTRANSC (1 << 3)
+#define RK3288_UOC0_CON3_UTMI_XCVRSEELCT_MASK (3 << 3)
+#define RK3288_UOC0_CON3_UTMI_TERMSEL_FULLSPEED BIT(5)
+#define RK3288_UOC0_CON3_BYPASSDMEN BIT(6)
+#define RK3288_UOC0_CON3_BYPASSSEL BIT(7)
+
+/*
+ * Enable the bypass of uart2 data through the otg usb phy.
+ * Original description in the TRM.
+ * 1. Disable the OTG block by setting OTGDISABLE0 to 1’b1.
+ * 2. Disable the pull-up resistance on the D+ line by setting
+ * OPMODE0[1:0] to 2’b01.
+ * 3. To ensure that the XO, Bias, and PLL blocks are powered down in Suspend
+ * mode, set COMMONONN to 1’b1.
+ * 4. Place the USB PHY in Suspend mode by setting SUSPENDM0 to 1’b0.
+ * 5. Set BYPASSSEL0 to 1’b1.
+ * 6. To transmit data, controls BYPASSDMEN0, and BYPASSDMDATA0.
+ * To receive data, monitor FSVPLUS0.
+ *
+ * The actual code in the vendor kernel does some things differently.
+ */
+static int __init rk3288_init_usb_uart(struct regmap *grf)
+{
+ u32 val;
+ int ret;
+
+ /*
+ * COMMON_ON and DISABLE settings are described in the TRM,
+ * but were not present in the original code.
+ * Also disable the analog phy components to save power.
+ */
+ val = HIWORD_UPDATE(RK3288_UOC0_CON0_COMMON_ON_N
+ | RK3288_UOC0_CON0_DISABLE
+ | UOC_CON0_SIDDQ,
+ RK3288_UOC0_CON0_COMMON_ON_N
+ | RK3288_UOC0_CON0_DISABLE
+ | UOC_CON0_SIDDQ);
+ ret = regmap_write(grf, RK3288_UOC0_CON0, val);
+ if (ret)
+ return ret;
+
+ val = HIWORD_UPDATE(RK3288_UOC0_CON2_SOFT_CON_SEL,
+ RK3288_UOC0_CON2_SOFT_CON_SEL);
+ ret = regmap_write(grf, RK3288_UOC0_CON2, val);
+ if (ret)
+ return ret;
+
+ val = HIWORD_UPDATE(RK3288_UOC0_CON3_UTMI_OPMODE_NODRIVING
+ | RK3288_UOC0_CON3_UTMI_XCVRSEELCT_FSTRANSC
+ | RK3288_UOC0_CON3_UTMI_TERMSEL_FULLSPEED,
+ RK3288_UOC0_CON3_UTMI_SUSPENDN
+ | RK3288_UOC0_CON3_UTMI_OPMODE_MASK
+ | RK3288_UOC0_CON3_UTMI_XCVRSEELCT_MASK
+ | RK3288_UOC0_CON3_UTMI_TERMSEL_FULLSPEED);
+ ret = regmap_write(grf, RK3288_UOC0_CON3, val);
+ if (ret)
+ return ret;
+
+ val = HIWORD_UPDATE(RK3288_UOC0_CON3_BYPASSSEL
+ | RK3288_UOC0_CON3_BYPASSDMEN,
+ RK3288_UOC0_CON3_BYPASSSEL
+ | RK3288_UOC0_CON3_BYPASSDMEN);
+ ret = regmap_write(grf, RK3288_UOC0_CON3, val);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static const struct rockchip_usb_phy_pdata rk3288_pdata = {
+ .phys = (struct rockchip_usb_phys[]){
+ { .reg = 0x320, .pll_name = "sclk_otgphy0_480m" },
+ { .reg = 0x334, .pll_name = "sclk_otgphy1_480m" },
+ { .reg = 0x348, .pll_name = "sclk_otgphy2_480m" },
+ { /* sentinel */ }
+ },
+ .init_usb_uart = rk3288_init_usb_uart,
+ .usb_uart_phy = 0,
+};
+
+static int rockchip_usb_phy_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct rockchip_usb_phy_base *phy_base;
+ struct phy_provider *phy_provider;
+ const struct of_device_id *match;
+ struct device_node *child;
+ int err;
+
+ phy_base = devm_kzalloc(dev, sizeof(*phy_base), GFP_KERNEL);
+ if (!phy_base)
+ return -ENOMEM;
+
+ match = of_match_device(dev->driver->of_match_table, dev);
+ if (!match || !match->data) {
+ dev_err(dev, "missing phy data\n");
+ return -EINVAL;
+ }
+
+ phy_base->pdata = match->data;
+
+ phy_base->dev = dev;
+ phy_base->reg_base = ERR_PTR(-ENODEV);
+ if (dev->parent && dev->parent->of_node)
+ phy_base->reg_base = syscon_node_to_regmap(
+ dev->parent->of_node);
+ if (IS_ERR(phy_base->reg_base))
+ phy_base->reg_base = syscon_regmap_lookup_by_phandle(
+ dev->of_node, "rockchip,grf");
+ if (IS_ERR(phy_base->reg_base)) {
+ dev_err(&pdev->dev, "Missing rockchip,grf property\n");
+ return PTR_ERR(phy_base->reg_base);
+ }
+
+ for_each_available_child_of_node(dev->of_node, child) {
+ err = rockchip_usb_phy_init(phy_base, child);
+ if (err) {
+ of_node_put(child);
+ return err;
+ }
+ }
+
+ phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
+ return PTR_ERR_OR_ZERO(phy_provider);
+}
+
+static const struct of_device_id rockchip_usb_phy_dt_ids[] = {
+ { .compatible = "rockchip,rk3066a-usb-phy", .data = &rk3066a_pdata },
+ { .compatible = "rockchip,rk3188-usb-phy", .data = &rk3188_pdata },
+ { .compatible = "rockchip,rk3288-usb-phy", .data = &rk3288_pdata },
+ {}
+};
+
+MODULE_DEVICE_TABLE(of, rockchip_usb_phy_dt_ids);
+
+static struct platform_driver rockchip_usb_driver = {
+ .probe = rockchip_usb_phy_probe,
+ .driver = {
+ .name = "rockchip-usb-phy",
+ .of_match_table = rockchip_usb_phy_dt_ids,
+ },
+};
+
+module_platform_driver(rockchip_usb_driver);
+
+#ifndef MODULE
+static int __init rockchip_init_usb_uart(void)
+{
+ const struct of_device_id *match;
+ const struct rockchip_usb_phy_pdata *data;
+ struct device_node *np;
+ struct regmap *grf;
+ int ret;
+
+ if (!enable_usb_uart)
+ return 0;
+
+ np = of_find_matching_node_and_match(NULL, rockchip_usb_phy_dt_ids,
+ &match);
+ if (!np) {
+ pr_err("%s: failed to find usbphy node\n", __func__);
+ return -ENOTSUPP;
+ }
+
+ pr_debug("%s: using settings for %s\n", __func__, match->compatible);
+ data = match->data;
+
+ if (!data->init_usb_uart) {
+ pr_err("%s: usb-uart not available on %s\n",
+ __func__, match->compatible);
+ return -ENOTSUPP;
+ }
+
+ grf = ERR_PTR(-ENODEV);
+ if (np->parent)
+ grf = syscon_node_to_regmap(np->parent);
+ if (IS_ERR(grf))
+ grf = syscon_regmap_lookup_by_phandle(np, "rockchip,grf");
+ if (IS_ERR(grf)) {
+ pr_err("%s: Missing rockchip,grf property, %lu\n",
+ __func__, PTR_ERR(grf));
+ return PTR_ERR(grf);
+ }
+
+ ret = data->init_usb_uart(grf);
+ if (ret) {
+ pr_err("%s: could not init usb_uart, %d\n", __func__, ret);
+ enable_usb_uart = 0;
+ return ret;
+ }
+
+ return 0;
+}
+early_initcall(rockchip_init_usb_uart);
+
+static int __init rockchip_usb_uart(char *buf)
+{
+ enable_usb_uart = true;
+ return 0;
+}
+early_param("rockchip.usb_uart", rockchip_usb_uart);
+#endif
+
+MODULE_AUTHOR("Yunzhi Li <lyz@rock-chips.com>");
+MODULE_DESCRIPTION("Rockchip USB 2.0 PHY driver");
+MODULE_LICENSE("GPL v2");
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-21 04:26:02 +0000