phy: Add Rockchip PCIe PHY driver

Add the Rockchip PCIe PHY driver as part of
Generic PHY framework.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>

diff --git a/drivers/phy/rockchip/Kconfig b/drivers/phy/rockchip/Kconfig
index 84cc7c8..2318e71 100644 (file)
--- 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 95b2f8a..4404915 100644 (file)
--- 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 (file)
index 0000000..83928cf
--- /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@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),
+};