[PATCH 1/3] phy: Add Rockchip PCIe PHY driver
Jagan Teki
jagan at amarulasolutions.com
Thu Jul 9 14:11:01 EDT 2020
Add the Rockchip PCIe PHY driver as part of
Generic PHY framework.
Signed-off-by: Jagan Teki <jagan at amarulasolutions.com>
---
drivers/phy/rockchip/Kconfig | 7 +
drivers/phy/rockchip/Makefile | 1 +
drivers/phy/rockchip/phy-rockchip-pcie.c | 271 +++++++++++++++++++++++
3 files changed, 279 insertions(+)
create mode 100644 drivers/phy/rockchip/phy-rockchip-pcie.c
diff --git a/drivers/phy/rockchip/Kconfig b/drivers/phy/rockchip/Kconfig
index 84cc7c876d..2318e71f35 100644
--- a/drivers/phy/rockchip/Kconfig
+++ b/drivers/phy/rockchip/Kconfig
@@ -11,6 +11,13 @@ config PHY_ROCKCHIP_INNO_USB2
help
Support for Rockchip USB2.0 PHY with Innosilicon IP block.
+config PHY_ROCKCHIP_PCIE
+ bool "Rockchip PCIe PHY Driver"
+ depends on ARCH_ROCKCHIP
+ select PHY
+ help
+ Enable this to support the Rockchip PCIe PHY.
+
config PHY_ROCKCHIP_TYPEC
bool "Rockchip TYPEC PHY Driver"
depends on ARCH_ROCKCHIP
diff --git a/drivers/phy/rockchip/Makefile b/drivers/phy/rockchip/Makefile
index 95b2f8a3c0..44049154f9 100644
--- a/drivers/phy/rockchip/Makefile
+++ b/drivers/phy/rockchip/Makefile
@@ -4,4 +4,5 @@
#
obj-$(CONFIG_PHY_ROCKCHIP_INNO_USB2) += phy-rockchip-inno-usb2.o
+obj-$(CONFIG_PHY_ROCKCHIP_PCIE) += phy-rockchip-pcie.o
obj-$(CONFIG_PHY_ROCKCHIP_TYPEC) += phy-rockchip-typec.o
diff --git a/drivers/phy/rockchip/phy-rockchip-pcie.c b/drivers/phy/rockchip/phy-rockchip-pcie.c
new file mode 100644
index 0000000000..83928cffe0
--- /dev/null
+++ b/drivers/phy/rockchip/phy-rockchip-pcie.c
@@ -0,0 +1,271 @@
+// SPDX-License-Identifier: (GPL-2.0-only)
+/*
+ * Rockchip PCIe PHY driver
+ *
+ * Copyright (C) 2020 Amarula Solutions(India)
+ * Copyright (C) 2016 Shawn Lin <shawn.lin at rock-chips.com>
+ * Copyright (C) 2016 ROCKCHIP, Inc.
+ */
+
+#include <common.h>
+#include <clk.h>
+#include <dm.h>
+#include <dm/device_compat.h>
+#include <generic-phy.h>
+#include <reset.h>
+#include <syscon.h>
+#include <asm/gpio.h>
+#include <asm/io.h>
+#include <linux/iopoll.h>
+#include <asm/arch-rockchip/clock.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/*
+ * 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_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_phy_data {
+ unsigned int pcie_conf;
+ unsigned int pcie_status;
+ unsigned int pcie_laneoff;
+};
+
+struct rockchip_pcie_phy {
+ void *reg_base;
+ struct clk refclk;
+ struct reset_ctl phy_rst;
+ const struct rockchip_pcie_phy_data *data;
+};
+
+static void phy_wr_cfg(struct rockchip_pcie_phy *priv, u32 addr, u32 data)
+{
+ u32 reg;
+
+ reg = HIWORD_UPDATE(data, PHY_CFG_DATA_MASK, PHY_CFG_DATA_SHIFT);
+ reg |= HIWORD_UPDATE(addr, PHY_CFG_ADDR_MASK, PHY_CFG_ADDR_SHIFT);
+ writel(reg, priv->reg_base + priv->data->pcie_conf);
+
+ udelay(1);
+
+ reg = HIWORD_UPDATE(PHY_CFG_WR_ENABLE,
+ PHY_CFG_WR_MASK,
+ PHY_CFG_WR_SHIFT);
+ writel(reg, priv->reg_base + priv->data->pcie_conf);
+
+ udelay(1);
+
+ reg = HIWORD_UPDATE(PHY_CFG_WR_DISABLE,
+ PHY_CFG_WR_MASK,
+ PHY_CFG_WR_SHIFT);
+ writel(reg, priv->reg_base + priv->data->pcie_conf);
+}
+
+static int rockchip_pcie_phy_power_on(struct phy *phy)
+{
+ struct rockchip_pcie_phy *priv = dev_get_priv(phy->dev);
+ int ret = 0;
+ u32 reg, status;
+
+ ret = reset_deassert(&priv->phy_rst);
+ if (ret) {
+ dev_err(dev, "failed to assert phy reset\n");
+ return ret;
+ }
+
+ reg = HIWORD_UPDATE(PHY_CFG_PLL_LOCK,
+ PHY_CFG_ADDR_MASK,
+ PHY_CFG_ADDR_SHIFT);
+ writel(reg, priv->reg_base + priv->data->pcie_conf);
+
+ reg = HIWORD_UPDATE(!PHY_LANE_IDLE_OFF,
+ PHY_LANE_IDLE_MASK,
+ PHY_LANE_IDLE_A_SHIFT);
+ writel(reg, priv->reg_base + priv->data->pcie_laneoff);
+
+ ret = -EINVAL;
+ ret = readl_poll_sleep_timeout(priv->reg_base + priv->data->pcie_status,
+ status,
+ status & PHY_PLL_LOCKED,
+ 20 * 1000,
+ 50);
+ if (ret) {
+ dev_err(&priv->dev, "pll lock timeout!\n");
+ goto err_pll_lock;
+ }
+
+ phy_wr_cfg(priv, PHY_CFG_CLK_TEST, PHY_CFG_SEPE_RATE);
+ phy_wr_cfg(priv, PHY_CFG_CLK_SCC, PHY_CFG_PLL_100M);
+
+ ret = -ETIMEDOUT;
+ ret = readl_poll_sleep_timeout(priv->reg_base + priv->data->pcie_status,
+ status,
+ !(status & PHY_PLL_OUTPUT),
+ 20 * 1000,
+ 50);
+ if (ret) {
+ dev_err(&priv->dev, "pll output enable timeout!\n");
+ goto err_pll_lock;
+ }
+
+ reg = HIWORD_UPDATE(PHY_CFG_PLL_LOCK,
+ PHY_CFG_ADDR_MASK,
+ PHY_CFG_ADDR_SHIFT);
+ writel(reg, priv->reg_base + priv->data->pcie_conf);
+
+ ret = -EINVAL;
+ ret = readl_poll_sleep_timeout(priv->reg_base + priv->data->pcie_status,
+ status,
+ status & PHY_PLL_LOCKED,
+ 20 * 1000,
+ 50);
+ if (ret) {
+ dev_err(&priv->dev, "pll relock timeout!\n");
+ goto err_pll_lock;
+ }
+
+ return 0;
+
+err_pll_lock:
+ reset_assert(&priv->phy_rst);
+ return ret;
+}
+
+static int rockchip_pcie_phy_power_off(struct phy *phy)
+{
+ struct rockchip_pcie_phy *priv = dev_get_priv(phy->dev);
+ int ret;
+ u32 reg;
+
+ reg = HIWORD_UPDATE(PHY_LANE_IDLE_OFF,
+ PHY_LANE_IDLE_MASK,
+ PHY_LANE_IDLE_A_SHIFT);
+ writel(reg, priv->reg_base + priv->data->pcie_laneoff);
+
+ ret = reset_assert(&priv->phy_rst);
+ if (ret) {
+ dev_err(dev, "failed to assert phy reset\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+static int rockchip_pcie_phy_init(struct phy *phy)
+{
+ struct rockchip_pcie_phy *priv = dev_get_priv(phy->dev);
+ int ret;
+
+ ret = clk_enable(&priv->refclk);
+ if (ret) {
+ dev_err(dev, "failed to enable refclk clock\n");
+ return ret;
+ }
+
+ ret = reset_assert(&priv->phy_rst);
+ if (ret) {
+ dev_err(dev, "failed to assert phy reset\n");
+ goto err_reset;
+ }
+
+ return 0;
+
+err_reset:
+ clk_disable(&priv->refclk);
+ return ret;
+}
+
+static int rockchip_pcie_phy_exit(struct phy *phy)
+{
+ struct rockchip_pcie_phy *priv = dev_get_priv(phy->dev);
+
+ clk_disable(&priv->refclk);
+
+ return 0;
+}
+
+static struct phy_ops rockchip_pcie_phy_ops = {
+ .init = rockchip_pcie_phy_init,
+ .power_on = rockchip_pcie_phy_power_on,
+ .power_off = rockchip_pcie_phy_power_off,
+ .exit = rockchip_pcie_phy_exit,
+};
+
+static int rockchip_pcie_phy_probe(struct udevice *dev)
+{
+ struct rockchip_pcie_phy *priv = dev_get_priv(dev);
+ int ret;
+
+ priv->data = (const struct rockchip_pcie_phy_data *)
+ dev_get_driver_data(dev);
+ if (!priv->data)
+ return -EINVAL;
+
+ priv->reg_base = syscon_get_first_range(ROCKCHIP_SYSCON_GRF);
+
+ ret = clk_get_by_name(dev, "refclk", &priv->refclk);
+ if (ret) {
+ dev_err(dev, "failed to get refclk clock phandle\n");
+ return ret;
+ }
+
+ ret = reset_get_by_name(dev, "phy", &priv->phy_rst);
+ if (ret) {
+ dev_err(dev, "failed to get phy reset phandle\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+static const struct rockchip_pcie_phy_data rk3399_pcie_data = {
+ .pcie_conf = 0xe220,
+ .pcie_status = 0xe2a4,
+ .pcie_laneoff = 0xe214,
+};
+
+static const struct udevice_id rockchip_pcie_phy_ids[] = {
+ {
+ .compatible = "rockchip,rk3399-pcie-phy",
+ .data = (ulong)&rk3399_pcie_data,
+ },
+ { /* sentile */ }
+};
+
+U_BOOT_DRIVER(rockchip_pcie_phy) = {
+ .name = "rockchip_pcie_phy",
+ .id = UCLASS_PHY,
+ .of_match = rockchip_pcie_phy_ids,
+ .ops = &rockchip_pcie_phy_ops,
+ .probe = rockchip_pcie_phy_probe,
+ .priv_auto_alloc_size = sizeof(struct rockchip_pcie_phy),
+};
--
2.25.1
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