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Message-Id: <1418291722-25448-2-git-send-email-lyz@rock-chips.com>
Date: Thu, 11 Dec 2014 17:55:18 +0800
From: Yunzhi Li <lyz@...k-chips.com>
To: heiko@...ech.de, jwerner@...omium.org, dianders@...omium.org
Cc: olof@...om.net, huangtao@...k-chips.com, zyw@...k-chips.com,
cf@...k-chips.com, linux-rockchip@...ts.infradead.org,
Yunzhi Li <lyz@...k-chips.com>,
Kishon Vijay Abraham I <kishon@...com>,
Grant Likely <grant.likely@...aro.org>,
Rob Herring <robh+dt@...nel.org>, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org
Subject: [PATCH v6 1/5] phy: add a driver for the Rockchip SoC internal USB2.0 PHY
This patch to add a generic PHY driver for ROCKCHIP usb PHYs,
currently this driver can support RK3288. The RK3288 SoC have
three independent USB PHY IPs which are all configured through a
set of registers located in the GRF (general register files)
module.
Signed-off-by: Yunzhi Li <lyz@...k-chips.com>
---
Changes in v6:
- Rename SIDDQ_MSK to SIDDQ_WRITE_ENA.
- Use phandle args to find a phy struct directly.
Changes in v5: None
Changes in v4:
- Get number of PHYs from device tree.
- Model each PHY as subnode of the phy provider node.
Changes in v3:
- Use BIT macro instead of bit shift ops.
- Rename the config entry to PHY_ROCKCHIP_USB.
drivers/phy/Kconfig | 7 ++
drivers/phy/Makefile | 1 +
drivers/phy/phy-rockchip-usb.c | 198 +++++++++++++++++++++++++++++++++++++++++
3 files changed, 206 insertions(+)
create mode 100644 drivers/phy/phy-rockchip-usb.c
diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
index ccad880..b24500a 100644
--- a/drivers/phy/Kconfig
+++ b/drivers/phy/Kconfig
@@ -239,6 +239,13 @@ config PHY_QCOM_IPQ806X_SATA
depends on OF
select GENERIC_PHY
+config PHY_ROCKCHIP_USB
+ tristate "Rockchip USB2 PHY Driver"
+ depends on ARCH_ROCKCHIP && OF
+ select GENERIC_PHY
+ help
+ Enable this to support the Rockchip USB 2.0 PHY.
+
config PHY_ST_SPEAR1310_MIPHY
tristate "ST SPEAR1310-MIPHY driver"
select GENERIC_PHY
diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
index aa74f96..48bf5a1 100644
--- a/drivers/phy/Makefile
+++ b/drivers/phy/Makefile
@@ -28,6 +28,7 @@ phy-exynos-usb2-$(CONFIG_PHY_EXYNOS5250_USB2) += phy-exynos5250-usb2.o
phy-exynos-usb2-$(CONFIG_PHY_S5PV210_USB2) += phy-s5pv210-usb2.o
obj-$(CONFIG_PHY_EXYNOS5_USBDRD) += phy-exynos5-usbdrd.o
obj-$(CONFIG_PHY_QCOM_APQ8064_SATA) += phy-qcom-apq8064-sata.o
+obj-$(CONFIG_PHY_ROCKCHIP_USB) += phy-rockchip-usb.o
obj-$(CONFIG_PHY_QCOM_IPQ806X_SATA) += phy-qcom-ipq806x-sata.o
obj-$(CONFIG_PHY_ST_SPEAR1310_MIPHY) += phy-spear1310-miphy.o
obj-$(CONFIG_PHY_ST_SPEAR1340_MIPHY) += phy-spear1340-miphy.o
diff --git a/drivers/phy/phy-rockchip-usb.c b/drivers/phy/phy-rockchip-usb.c
new file mode 100644
index 0000000..dad5194
--- /dev/null
+++ b/drivers/phy/phy-rockchip-usb.c
@@ -0,0 +1,198 @@
+/*
+ * Rockchip usb PHY driver
+ *
+ * Copyright (C) 2014 Yunzhi Li <lyz@...k-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/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/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>
+
+#define ROCKCHIP_RK3288_UOC(n) (0x320 + n * 0x14)
+
+/*
+ * The higher 16-bit of this register is used for write protection
+ * only if BIT(13 + 16) set to 1 the BIT(13) can be written.
+ */
+#define SIDDQ_WRITE_ENA BIT(29)
+#define SIDDQ_ON BIT(13)
+#define SIDDQ_OFF (0 << 13)
+
+struct rockchip_usb_phy {
+ struct regmap *reg_base;
+ unsigned int reg_offset;
+ struct clk *clk;
+ struct phy *phy;
+};
+
+struct rockchip_usb_phy_priv {
+ struct rockchip_usb_phy *phys;
+ unsigned nphys;
+};
+
+static int rockchip_usb_phy_power(struct rockchip_usb_phy *phy,
+ bool siddq)
+{
+ return regmap_write(phy->reg_base, phy->reg_offset,
+ SIDDQ_WRITE_ENA | (siddq ? SIDDQ_ON : SIDDQ_OFF));
+}
+
+static int rockchip_usb_phy_power_off(struct phy *_phy)
+{
+ struct rockchip_usb_phy *phy = phy_get_drvdata(_phy);
+ int ret = 0;
+
+ /* Power down usb phy analog blocks by set siddq 1 */
+ ret = rockchip_usb_phy_power(phy, 1);
+ if (ret)
+ return ret;
+
+ clk_disable_unprepare(phy->clk);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static int rockchip_usb_phy_power_on(struct phy *_phy)
+{
+ struct rockchip_usb_phy *phy = phy_get_drvdata(_phy);
+ int ret = 0;
+
+ ret = clk_prepare_enable(phy->clk);
+ if (ret)
+ return ret;
+
+ /* Power up usb phy analog blocks by set siddq 0 */
+ ret = rockchip_usb_phy_power(phy, 0);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static struct phy *rockchip_usb_phy_xlate(struct device *dev,
+ struct of_phandle_args *args)
+{
+ struct rockchip_usb_phy_priv *priv = dev_get_drvdata(dev);
+ unsigned int phy_id = args->args[0];
+
+ if (WARN_ON(phy_id < 0 || phy_id >= priv->nphys))
+ return ERR_PTR(-ENODEV);
+
+ return priv->phys[phy_id].phy;
+}
+
+static struct phy_ops ops = {
+ .power_on = rockchip_usb_phy_power_on,
+ .power_off = rockchip_usb_phy_power_off,
+ .owner = THIS_MODULE,
+};
+
+static int rockchip_usb_phy_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct rockchip_usb_phy *rk_phy;
+ struct rockchip_usb_phy_priv *priv;
+ struct phy_provider *phy_provider;
+ struct device_node *child;
+ struct regmap *grf;
+ unsigned int phy_id;
+
+ grf = syscon_regmap_lookup_by_phandle(dev->of_node, "rockchip,grf");
+ if (IS_ERR(grf)) {
+ dev_err(&pdev->dev, "Missing rockchip,grf property\n");
+ return PTR_ERR(grf);
+ }
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ /* Get number of phys from device tree */
+ priv->nphys = of_get_child_count(dev->of_node);
+ if (priv->nphys == 0)
+ return -ENODEV;
+
+ priv->phys = devm_kzalloc(dev, priv->nphys * sizeof(*priv->phys),
+ GFP_KERNEL);
+ if (!priv->phys)
+ return -ENOMEM;
+
+ for_each_available_child_of_node(dev->of_node, child) {
+ if (of_property_read_u32(child, "reg", &phy_id)) {
+ dev_err(dev, "missing reg property in node %s\n",
+ child->name);
+ return -EINVAL;
+ }
+
+ if (phy_id < 0 || phy_id >= priv->nphys) {
+ dev_err(dev, "invalid phy id\n");
+ return -EINVAL;
+ }
+ rk_phy = &priv->phys[phy_id];
+ rk_phy->reg_offset = ROCKCHIP_RK3288_UOC(phy_id);
+ rk_phy->reg_base = grf;
+
+ rk_phy->clk = of_clk_get(child, 0);
+ if (IS_ERR(rk_phy->clk)) {
+ dev_warn(dev, "failed to get clock\n");
+ rk_phy->clk = NULL;
+ }
+
+ rk_phy->phy = devm_phy_create(dev, NULL, &ops);
+ if (IS_ERR(rk_phy->phy)) {
+ dev_err(dev, "failed to create PHY %d\n", phy_id);
+ return PTR_ERR(rk_phy->phy);
+ }
+ phy_set_drvdata(rk_phy->phy, rk_phy);
+ }
+
+ platform_set_drvdata(pdev, priv);
+
+ phy_provider = devm_of_phy_provider_register(dev,
+ rockchip_usb_phy_xlate);
+ return PTR_ERR_OR_ZERO(phy_provider);
+}
+
+static const struct of_device_id rockchip_usb_phy_dt_ids[] = {
+ { .compatible = "rockchip,rk3288-usb-phy" },
+ {}
+};
+
+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",
+ .owner = THIS_MODULE,
+ .of_match_table = rockchip_usb_phy_dt_ids,
+ },
+};
+
+module_platform_driver(rockchip_usb_driver);
+
+MODULE_AUTHOR("Yunzhi Li <lyz@...k-chips.com>");
+MODULE_DESCRIPTION("Rockchip USB 2.0 PHY driver");
+MODULE_LICENSE("GPL v2");
--
2.0.0
--
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