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[PATCH v4 1/2] Documentation: bindings: add dt documentation for Rockchip PCIe PHY

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  [PATCH v4 1/2] Documentation: bindings: add dt documentation for Rockchip PCIe PHY Shawn Lin <shawn.lin@rock-chips.com> - 2016-07-29 03:30 +0200
    [PATCH v4 2/2] phy: add a driver for the Rockchip SoC internal PCIe PHY Shawn Lin <shawn.lin@rock-chips.com> - 2016-07-29 03:30 +0200
    Re: [PATCH v4 1/2] Documentation: bindings: add dt documentation for  Rockchip PCIe PHY Rob Herring <robh@kernel.org> - 2016-07-29 23:40 +0200
      Re: [PATCH v4 1/2] Documentation: bindings: add dt documentation for  Rockchip PCIe PHY Shawn Lin <shawn.lin@rock-chips.com> - 2016-08-01 05:10 +0200

#1452203 — [PATCH v4 1/2] Documentation: bindings: add dt documentation for Rockchip PCIe PHY

This patch adds a binding that describes the Rockchip PCIe PHY
found on Rockchip SoCs PCIe interface.

Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>

---

Changes in v4: None
Changes in v3:
- rename the node to pcie_phy: pcie-phy suggested by Doug

Changes in v2:
- add clk and reset description
- remove unit-address

 .../devicetree/bindings/phy/rockchip-pcie-phy.txt  | 32 ++++++++++++++++++++++
 1 file changed, 32 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/phy/rockchip-pcie-phy.txt

diff --git a/Documentation/devicetree/bindings/phy/rockchip-pcie-phy.txt b/Documentation/devicetree/bindings/phy/rockchip-pcie-phy.txt
new file mode 100644
index 0000000..aedca29
--- /dev/null
+++ b/Documentation/devicetree/bindings/phy/rockchip-pcie-phy.txt
@@ -0,0 +1,32 @@
+Rockchip PCIE PHY
+-----------------------
+
+Required properties:
+ - compatible: rockchip,rk3399-pcie-phy
+ - #phy-cells: must be 0
+ - clocks: Must contain an entry in clock-names.
+	See ../clocks/clock-bindings.txt for details.
+ - clock-names: Must be "refclk"
+ - resets: Must contain an entry in reset-names.
+	See ../reset/reset.txt for details.
+ - reset-names: Must be "phy"
+
+Example:
+
+grf: syscon@ff770000 {
+	compatible = "rockchip,rk3399-grf", "syscon", "simple-mfd";
+	#address-cells = <1>;
+	#size-cells = <1>;
+
+	...
+
+	pcie_phy: pcie-phy {
+		compatible = "rockchip,rk3399-pcie-phy";
+		#phy-cells = <0>;
+		clocks = <&cru SCLK_PCIEPHY_REF>;
+		clock-names = "refclk";
+		resets = <&cru SRST_PCIEPHY>;
+		reset-names = "phy";
+	};
+};
+
-- 
2.3.7

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#1452205 — [PATCH v4 2/2] phy: add a driver for the Rockchip SoC internal PCIe PHY

This patch to add a generic PHY driver for rockchip PCIe PHY.
Access the PHY via registers provided by GRF (general register
files) module.

Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>

---

Changes in v4:
- remove laneoff symbol as we still fail to get a workable solution
  except for exporting symbol. But I will be back with some other possible
  routine once finished.

Changes in v3: None
Changes in v2: None

 drivers/phy/Kconfig             |   7 +
 drivers/phy/Makefile            |   1 +
 drivers/phy/phy-rockchip-pcie.c | 357 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 365 insertions(+)
 create mode 100644 drivers/phy/phy-rockchip-pcie.c

diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
index 02afc624..824b568 100644
--- a/drivers/phy/Kconfig
+++ b/drivers/phy/Kconfig
@@ -371,6 +371,13 @@ config PHY_ROCKCHIP_DP
 	help
 	  Enable this to support the Rockchip Display Port PHY.
 
+config PHY_ROCKCHIP_PCIE
+	tristate "Rockchip PCIe PHY Driver"
+	depends on ARCH_ROCKCHIP && OF
+	select GENERIC_PHY
+	help
+	  Enable this to support the Rockchip PCIe 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 fa8480e..0a9dcd8 100644
--- a/drivers/phy/Makefile
+++ b/drivers/phy/Makefile
@@ -40,6 +40,7 @@ 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_ROCKCHIP_EMMC) += phy-rockchip-emmc.o
+obj-$(CONFIG_PHY_ROCKCHIP_PCIE) += phy-rockchip-pcie.o
 obj-$(CONFIG_PHY_ROCKCHIP_DP)		+= phy-rockchip-dp.o
 obj-$(CONFIG_PHY_QCOM_IPQ806X_SATA)	+= phy-qcom-ipq806x-sata.o
 obj-$(CONFIG_PHY_ST_SPEAR1310_MIPHY)	+= phy-spear1310-miphy.o
diff --git a/drivers/phy/phy-rockchip-pcie.c b/drivers/phy/phy-rockchip-pcie.c
new file mode 100644
index 0000000..63cd200
--- /dev/null
+++ b/drivers/phy/phy-rockchip-pcie.c
@@ -0,0 +1,357 @@
+/*
+ * Rockchip PCIe PHY driver
+ *
+ * Copyright (C) 2016 Shawn Lin <shawn.lin@rock-chips.com>
+ * Copyright (C) 2016 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/delay.h>
+#include <linux/io.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.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/regmap.h>
+#include <linux/reset.h>
+
+/*
+ * The higher 16-bit of this register is used for write protection
+ * only if BIT(x + 16) set to 1 the BIT(x) can be written.
+ */
+#define HIWORD_UPDATE(val, mask, shift) \
+		((val) << (shift) | (mask) << ((shift) + 16))
+
+#define PHY_MAX_LANE_NUM      4
+#define PHY_CFG_DATA_SHIFT    7
+#define PHY_CFG_ADDR_SHIFT    1
+#define PHY_CFG_DATA_MASK     0xf
+#define PHY_CFG_ADDR_MASK     0x3f
+#define PHY_CFG_RD_MASK       0x3ff
+#define PHY_CFG_WR_ENABLE     1
+#define PHY_CFG_WR_DISABLE    1
+#define PHY_CFG_WR_SHIFT      0
+#define PHY_CFG_WR_MASK       1
+#define PHY_CFG_PLL_LOCK      0x10
+#define PHY_CFG_CLK_TEST      0x10
+#define PHY_CFG_CLK_SCC       0x12
+#define PHY_CFG_SEPE_RATE     BIT(3)
+#define PHY_CFG_PLL_100M      BIT(3)
+#define PHY_PLL_LOCKED        BIT(9)
+#define PHY_PLL_OUTPUT        BIT(10)
+#define PHY_LANE_A_STATUS     0x30
+#define PHY_LANE_B_STATUS     0x31
+#define PHY_LANE_C_STATUS     0x32
+#define PHY_LANE_D_STATUS     0x33
+#define PHY_LANE_RX_DET_SHIFT 11
+#define PHY_LANE_RX_DET_TH    0x1
+#define PHY_LANE_IDLE_OFF     0x1
+#define PHY_LANE_IDLE_MASK    0x1
+#define PHY_LANE_IDLE_A_SHIFT 3
+#define PHY_LANE_IDLE_B_SHIFT 4
+#define PHY_LANE_IDLE_C_SHIFT 5
+#define PHY_LANE_IDLE_D_SHIFT 6
+
+struct rockchip_pcie_data {
+	unsigned int pcie_conf;
+	unsigned int pcie_status;
+	unsigned int pcie_laneoff;
+};
+
+struct rockchip_pcie_phy {
+	struct rockchip_pcie_data *phy_data;
+	struct regmap *reg_base;
+	struct reset_control *phy_rst;
+	struct clk *clk_pciephy_ref;
+};
+
+static inline void phy_wr_cfg(struct rockchip_pcie_phy *rk_phy,
+			      u32 addr, u32 data)
+{
+	regmap_write(rk_phy->reg_base, rk_phy->phy_data->pcie_conf,
+		     HIWORD_UPDATE(data,
+				   PHY_CFG_DATA_MASK,
+				   PHY_CFG_DATA_SHIFT) |
+		     HIWORD_UPDATE(addr,
+				   PHY_CFG_ADDR_MASK,
+				   PHY_CFG_ADDR_SHIFT));
+	udelay(1);
+	regmap_write(rk_phy->reg_base, rk_phy->phy_data->pcie_conf,
+		     HIWORD_UPDATE(PHY_CFG_WR_ENABLE,
+				   PHY_CFG_WR_MASK,
+				   PHY_CFG_WR_SHIFT));
+	udelay(1);
+	regmap_write(rk_phy->reg_base, rk_phy->phy_data->pcie_conf,
+		     HIWORD_UPDATE(PHY_CFG_WR_DISABLE,
+				   PHY_CFG_WR_MASK,
+				   PHY_CFG_WR_SHIFT));
+}
+
+static inline u32 phy_rd_cfg(struct rockchip_pcie_phy *rk_phy,
+			     u32 addr)
+{
+	u32 val;
+
+	regmap_write(rk_phy->reg_base, rk_phy->phy_data->pcie_conf,
+		     HIWORD_UPDATE(addr,
+				   PHY_CFG_RD_MASK,
+				   PHY_CFG_ADDR_SHIFT));
+	regmap_read(rk_phy->reg_base,
+		    rk_phy->phy_data->pcie_status,
+		    &val);
+	return val;
+}
+
+static int rockchip_pcie_phy_power_off(struct phy *phy)
+{
+	struct rockchip_pcie_phy *rk_phy = phy_get_drvdata(phy);
+	int err = 0;
+
+	err = reset_control_assert(rk_phy->phy_rst);
+	if (err) {
+		pr_err("assert phy_rst err %d\n", err);
+		return err;
+	}
+
+	return 0;
+}
+
+static int rockchip_pcie_phy_power_on(struct phy *phy)
+{
+	struct rockchip_pcie_phy *rk_phy = phy_get_drvdata(phy);
+	int err = 0;
+	u32 status;
+	unsigned long timeout;
+
+	err = reset_control_deassert(rk_phy->phy_rst);
+	if (err) {
+		pr_err("deassert phy_rst err %d\n", err);
+		return err;
+	}
+
+	regmap_write(rk_phy->reg_base, rk_phy->phy_data->pcie_conf,
+		     HIWORD_UPDATE(PHY_CFG_PLL_LOCK,
+				   PHY_CFG_ADDR_MASK,
+				   PHY_CFG_ADDR_SHIFT));
+
+	/*
+	 * No documented timeout value for phy operation below,
+	 * so we make it large enough here. And we use loop-break
+	 * method which should not be harmful.
+	 */
+	timeout = jiffies + msecs_to_jiffies(1000);
+
+	err = -EINVAL;
+	while (time_before(jiffies, timeout)) {
+		regmap_read(rk_phy->reg_base,
+			    rk_phy->phy_data->pcie_status,
+			    &status);
+		if (status & PHY_PLL_LOCKED) {
+			pr_debug("pll locked!\n");
+			err = 0;
+			break;
+		}
+		msleep(20);
+	}
+
+	if (err) {
+		pr_err("pll lock timeout!\n");
+		goto err_pll_lock;
+	}
+
+	phy_wr_cfg(rk_phy, PHY_CFG_CLK_TEST, PHY_CFG_SEPE_RATE);
+	phy_wr_cfg(rk_phy, PHY_CFG_CLK_SCC, PHY_CFG_PLL_100M);
+
+	err = -ETIMEDOUT;
+	while (time_before(jiffies, timeout)) {
+		regmap_read(rk_phy->reg_base,
+			    rk_phy->phy_data->pcie_status,
+			    &status);
+		if (!(status & PHY_PLL_OUTPUT)) {
+			pr_debug("pll output enable done!\n");
+			err = 0;
+			break;
+		}
+		msleep(20);
+	}
+
+	if (err) {
+		pr_err("pll output enable timeout!\n");
+		goto err_pll_lock;
+	}
+
+	regmap_write(rk_phy->reg_base, rk_phy->phy_data->pcie_conf,
+		     HIWORD_UPDATE(PHY_CFG_PLL_LOCK,
+				   PHY_CFG_ADDR_MASK,
+				   PHY_CFG_ADDR_SHIFT));
+	err = -EINVAL;
+	while (time_before(jiffies, timeout)) {
+		regmap_read(rk_phy->reg_base,
+			    rk_phy->phy_data->pcie_status,
+			    &status);
+		if (status & PHY_PLL_LOCKED) {
+			pr_debug("pll relocked!\n");
+			err = 0;
+			break;
+		}
+		msleep(20);
+	}
+
+	if (err) {
+		pr_err("pll relock timeout!\n");
+		goto err_pll_lock;
+	}
+
+	return 0;
+
+err_pll_lock:
+	reset_control_assert(rk_phy->phy_rst);
+	return err;
+}
+
+static int rockchip_pcie_phy_init(struct phy *phy)
+{
+	struct rockchip_pcie_phy *rk_phy = phy_get_drvdata(phy);
+	int err = 0;
+
+	err = clk_prepare_enable(rk_phy->clk_pciephy_ref);
+	if (err) {
+		pr_err("Fail to enable pcie ref clock.\n");
+		goto err_refclk;
+	}
+
+	err = reset_control_assert(rk_phy->phy_rst);
+	if (err) {
+		pr_err("assert phy_rst err %d\n", err);
+		goto err_reset;
+	}
+
+	return err;
+
+err_reset:
+	clk_disable_unprepare(rk_phy->clk_pciephy_ref);
+err_refclk:
+	return err;
+}
+
+static int rockchip_pcie_phy_exit(struct phy *phy)
+{
+	struct rockchip_pcie_phy *rk_phy = phy_get_drvdata(phy);
+	int err = 0;
+
+	clk_disable_unprepare(rk_phy->clk_pciephy_ref);
+
+	err = reset_control_deassert(rk_phy->phy_rst);
+	if (err) {
+		pr_err("deassert phy_rst err %d\n", err);
+		goto err_reset;
+	}
+
+	return err;
+
+err_reset:
+	clk_prepare_enable(rk_phy->clk_pciephy_ref);
+	return err;
+}
+
+static const struct phy_ops ops = {
+	.init		= rockchip_pcie_phy_init,
+	.exit		= rockchip_pcie_phy_exit,
+	.power_on	= rockchip_pcie_phy_power_on,
+	.power_off	= rockchip_pcie_phy_power_off,
+	.owner		= THIS_MODULE,
+};
+
+static const struct rockchip_pcie_data rk3399_pcie_data = {
+	.pcie_conf = 0xe220,
+	.pcie_status = 0xe2a4,
+	.pcie_laneoff = 0xe214,
+};
+
+static const struct of_device_id rockchip_pcie_phy_dt_ids[] = {
+	{
+		.compatible = "rockchip,rk3399-pcie-phy",
+		.data = &rk3399_pcie_data,
+	},
+	{}
+};
+
+MODULE_DEVICE_TABLE(of, rockchip_pcie_phy_dt_ids);
+
+static int rockchip_pcie_phy_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct rockchip_pcie_phy *rk_phy;
+	struct phy *generic_phy;
+	struct phy_provider *phy_provider;
+	struct regmap *grf;
+	const struct of_device_id *of_id;
+
+	grf = syscon_node_to_regmap(dev->parent->of_node);
+	if (IS_ERR(grf)) {
+		dev_err(dev, "Missing rockchip,grf property\n");
+		return PTR_ERR(grf);
+	}
+
+	rk_phy = devm_kzalloc(dev, sizeof(*rk_phy), GFP_KERNEL);
+	if (!rk_phy)
+		return -ENOMEM;
+
+	of_id = of_match_device(rockchip_pcie_phy_dt_ids, &pdev->dev);
+	if (!of_id)
+		return -EINVAL;
+
+	rk_phy->phy_data = (struct rockchip_pcie_data *)of_id->data;
+	rk_phy->reg_base = grf;
+
+	rk_phy->phy_rst = devm_reset_control_get(dev, "phy");
+	if (IS_ERR(rk_phy->phy_rst)) {
+		if (PTR_ERR(rk_phy->phy_rst) != -EPROBE_DEFER)
+			dev_err(dev,
+				"missing phy property for reset controller\n");
+		return PTR_ERR(rk_phy->phy_rst);
+	}
+
+	rk_phy->clk_pciephy_ref = devm_clk_get(dev, "refclk");
+	if (IS_ERR(rk_phy->clk_pciephy_ref)) {
+		dev_err(dev, "refclk not found.\n");
+		return PTR_ERR(rk_phy->clk_pciephy_ref);
+	}
+
+	generic_phy = devm_phy_create(dev, dev->of_node, &ops);
+	if (IS_ERR(generic_phy)) {
+		dev_err(dev, "failed to create PHY\n");
+		return PTR_ERR(generic_phy);
+	}
+
+	phy_set_drvdata(generic_phy, rk_phy);
+	phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
+
+	return PTR_ERR_OR_ZERO(phy_provider);
+}
+
+static struct platform_driver rockchip_pcie_driver = {
+	.probe		= rockchip_pcie_phy_probe,
+	.driver		= {
+		.name	= "rockchip-pcie-phy",
+		.of_match_table = rockchip_pcie_phy_dt_ids,
+	},
+};
+
+module_platform_driver(rockchip_pcie_driver);
+
+MODULE_AUTHOR("Shawn Lin <shawn.lin@rock-chips.com>");
+MODULE_DESCRIPTION("Rockchip PCIe PHY driver");
+MODULE_LICENSE("GPL v2");
-- 
2.3.7

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#1452585 — Re: [PATCH v4 1/2] Documentation: bindings: add dt documentation for Rockchip PCIe PHY

On Fri, Jul 29, 2016 at 09:22:05AM +0800, Shawn Lin wrote:
> This patch adds a binding that describes the Rockchip PCIe PHY
> found on Rockchip SoCs PCIe interface.
> 
> Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
> 
> ---
> 
> Changes in v4: None
> Changes in v3:
> - rename the node to pcie_phy: pcie-phy suggested by Doug
> 
> Changes in v2:
> - add clk and reset description
> - remove unit-address
> 
>  .../devicetree/bindings/phy/rockchip-pcie-phy.txt  | 32 ++++++++++++++++++++++
>  1 file changed, 32 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/phy/rockchip-pcie-phy.txt

Please add acks when posting new versions.

Rob

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#1452943 — Re: [PATCH v4 1/2] Documentation: bindings: add dt documentation for Rockchip PCIe PHY

在 2016/7/30 5:34, Rob Herring 写道:
> On Fri, Jul 29, 2016 at 09:22:05AM +0800, Shawn Lin wrote:
>> This patch adds a binding that describes the Rockchip PCIe PHY
>> found on Rockchip SoCs PCIe interface.
>>
>> Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
>>
>> ---
>>
>> Changes in v4: None
>> Changes in v3:
>> - rename the node to pcie_phy: pcie-phy suggested by Doug
>>
>> Changes in v2:
>> - add clk and reset description
>> - remove unit-address
>>
>>  .../devicetree/bindings/phy/rockchip-pcie-phy.txt  | 32 ++++++++++++++++++++++
>>  1 file changed, 32 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/phy/rockchip-pcie-phy.txt
>
> Please add acks when posting new versions.

yup, but I didn't see your ack for my previous version.
Anyway, I will add it if needing to respin one, or Kishon could add
it if all others look good to him when applying these? :)

>
> Rob
>
>
>


-- 
Best Regards
Shawn Lin

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