[PATCH v3 4/6] pci: Add Rockchip PCIe PHY controller driver
Suniel Mahesh
sunil at amarulasolutions.com
Sun May 10 22:31:00 CEST 2020
On Sat, May 9, 2020 at 10:26 PM Jagan Teki <jagan at amarulasolutions.com>
wrote:
> Yes, it is possible to have a dedicated UCLASS PHY driver
> for this Rockchip PCIe PHY but there are some issues on
> Generic PHY framework to support the same.
>
> The Generic PHY framework is unable to get the PHY if
> the PHY parent is of a different uclass.
>
> Say if we try to get the PCIe PHY then the phy-uclass
> will look for PHY in the first instance if it is not
> in the root node it will try to probe the parent by
> assuming that the actual PHY is inside the parent PHY
> of UCLASS_PHY. But, in rk3399 hardware representation
> PHY like emmc, usb and pcie are part of syscon which
> is completely a different of UCLASS_SYSCON.
>
> Example:
>
> grf: syscon at ff770000 {
> compatible = "rockchip,rk3399-grf", "syscon", "simple-mfd";
> reg = <0x0 0xff770000 0x0 0x10000>;
> #address-cells = <1>;
> #size-cells = <1>;
>
> pcie_phy: pcie-phy {
> compatible = "rockchip,rk3399-pcie-phy";
> clocks = <&cru SCLK_PCIEPHY_REF>;
> clock-names = "refclk";
> #phy-cells = <1>;
> resets = <&cru SRST_PCIEPHY>;
> drive-impedance-ohm = <50>;
> reset-names = "phy";
> status = "disabled";
> };
> };
>
> Due to this limitation, this patch adds a separate PHY
> driver for Rockchip PCIe. This might be removed in future
> once Generic PHY supports this limitation.
>
> Signed-off-by: Jagan Teki <jagan at amarulasolutions.com>
> ---
> Changes for v3:
> - none
>
> drivers/pci/Makefile | 2 +-
> drivers/pci/pcie_rockchip.c | 50 ++++++--
> drivers/pci/pcie_rockchip.h | 63 ++++++++++
> drivers/pci/pcie_rockchip_phy.c | 205 ++++++++++++++++++++++++++++++++
> 4 files changed, 306 insertions(+), 14 deletions(-)
> create mode 100644 drivers/pci/pcie_rockchip_phy.c
>
> diff --git a/drivers/pci/Makefile b/drivers/pci/Makefile
> index 493e9354dd..955351c5c2 100644
> --- a/drivers/pci/Makefile
> +++ b/drivers/pci/Makefile
> @@ -43,4 +43,4 @@ obj-$(CONFIG_PCI_PHYTIUM) += pcie_phytium.o
> obj-$(CONFIG_PCIE_INTEL_FPGA) += pcie_intel_fpga.o
> obj-$(CONFIG_PCI_KEYSTONE) += pcie_dw_ti.o
> obj-$(CONFIG_PCIE_MEDIATEK) += pcie_mediatek.o
> -obj-$(CONFIG_PCIE_ROCKCHIP) += pcie_rockchip.o
> +obj-$(CONFIG_PCIE_ROCKCHIP) += pcie_rockchip.o pcie_rockchip_phy.o
> diff --git a/drivers/pci/pcie_rockchip.c b/drivers/pci/pcie_rockchip.c
> index 3f06f783ca..82a8396e42 100644
> --- a/drivers/pci/pcie_rockchip.c
> +++ b/drivers/pci/pcie_rockchip.c
> @@ -159,6 +159,8 @@ static int rockchip_pcie_atr_init(struct rockchip_pcie
> *priv)
> static int rockchip_pcie_init_port(struct udevice *dev)
> {
> struct rockchip_pcie *priv = dev_get_priv(dev);
> + struct rockchip_pcie_phy *phy = pcie_get_phy(priv);
> + struct rockchip_pcie_phy_ops *ops = phy_get_ops(phy);
> u32 cr, val, status;
> int ret;
>
> @@ -183,29 +185,35 @@ static int rockchip_pcie_init_port(struct udevice
> *dev)
> return ret;
> }
>
> + ret = ops->init(phy);
> + if (ret) {
> + dev_err(dev, "failed to init phy (ret=%d)\n", ret);
> + goto err_exit_phy;
> + }
> +
> ret = reset_assert(&priv->core_rst);
> if (ret) {
> dev_err(dev, "failed to assert core reset (ret=%d)\n",
> ret);
> - return ret;
> + goto err_exit_phy;
> }
>
> ret = reset_assert(&priv->mgmt_rst);
> if (ret) {
> dev_err(dev, "failed to assert mgmt reset (ret=%d)\n",
> ret);
> - return ret;
> + goto err_exit_phy;
> }
>
> ret = reset_assert(&priv->mgmt_sticky_rst);
> if (ret) {
> dev_err(dev, "failed to assert mgmt-sticky reset
> (ret=%d)\n",
> ret);
> - return ret;
> + goto err_exit_phy;
> }
>
> ret = reset_assert(&priv->pipe_rst);
> if (ret) {
> dev_err(dev, "failed to assert pipe reset (ret=%d)\n",
> ret);
> - return ret;
> + goto err_exit_phy;
> }
>
> udelay(10);
> @@ -213,19 +221,19 @@ static int rockchip_pcie_init_port(struct udevice
> *dev)
> ret = reset_deassert(&priv->pm_rst);
> if (ret) {
> dev_err(dev, "failed to deassert pm reset (ret=%d)\n",
> ret);
> - return ret;
> + goto err_exit_phy;
> }
>
> ret = reset_deassert(&priv->aclk_rst);
> if (ret) {
> dev_err(dev, "failed to deassert aclk reset (ret=%d)\n",
> ret);
> - return ret;
> + goto err_exit_phy;
> }
>
> ret = reset_deassert(&priv->pclk_rst);
> if (ret) {
> dev_err(dev, "failed to deassert pclk reset (ret=%d)\n",
> ret);
> - return ret;
> + goto err_exit_phy;
> }
>
> /* Select GEN1 for now */
> @@ -234,29 +242,35 @@ static int rockchip_pcie_init_port(struct udevice
> *dev)
> cr |= PCIE_CLIENT_CONF_ENABLE | PCIE_CLIENT_MODE_RC;
> writel(cr, priv->apb_base + PCIE_CLIENT_CONFIG);
>
> + ret = ops->power_on(phy);
> + if (ret) {
> + dev_err(dev, "failed to power on phy (ret=%d)\n", ret);
> + goto err_power_off_phy;
> + }
> +
> ret = reset_deassert(&priv->mgmt_sticky_rst);
> if (ret) {
> dev_err(dev, "failed to deassert mgmt-sticky reset
> (ret=%d)\n",
> ret);
> - return ret;
> + goto err_power_off_phy;
> }
>
> ret = reset_deassert(&priv->core_rst);
> if (ret) {
> dev_err(dev, "failed to deassert core reset (ret=%d)\n",
> ret);
> - return ret;
> + goto err_power_off_phy;
> }
>
> ret = reset_deassert(&priv->mgmt_rst);
> if (ret) {
> dev_err(dev, "failed to deassert mgmt reset (ret=%d)\n",
> ret);
> - return ret;
> + goto err_power_off_phy;
> }
>
> ret = reset_deassert(&priv->pipe_rst);
> if (ret) {
> dev_err(dev, "failed to deassert pipe reset (ret=%d)\n",
> ret);
> - return ret;
> + goto err_power_off_phy;
> }
>
> /* Enable Gen1 training */
> @@ -271,7 +285,7 @@ static int rockchip_pcie_init_port(struct udevice *dev)
> status, PCIE_LINK_UP(status), 20, 500 * 1000);
> if (ret) {
> dev_err(dev, "PCIe link training gen1 timeout!\n");
> - return ret;
> + goto err_power_off_phy;
> }
>
> /* Initialize Root Complex registers. */
> @@ -291,10 +305,16 @@ static int rockchip_pcie_init_port(struct udevice
> *dev)
> ret = rockchip_pcie_atr_init(priv);
> if (ret) {
> dev_err(dev, "PCIE-%d: ATR init failed\n", dev->seq);
> - return ret;
> + goto err_power_off_phy;
> }
>
> return 0;
> +
> +err_power_off_phy:
> + ops->power_off(phy);
> +err_exit_phy:
> + ops->exit(phy);
> + return ret;
> }
>
> static int rockchip_pcie_set_vpcie(struct udevice *dev)
> @@ -433,6 +453,10 @@ static int rockchip_pcie_probe(struct udevice *dev)
> if (ret)
> return ret;
>
> + ret = rockchip_pcie_phy_get(dev);
> + if (ret)
> + return ret;
> +
> ret = rockchip_pcie_set_vpcie(dev);
> if (ret)
> return ret;
> diff --git a/drivers/pci/pcie_rockchip.h b/drivers/pci/pcie_rockchip.h
> index 6ded5c9553..c3a0a2846d 100644
> --- a/drivers/pci/pcie_rockchip.h
> +++ b/drivers/pci/pcie_rockchip.h
> @@ -53,11 +53,61 @@
> #define PCIE_ATR_OB_REGION0_SIZE (32 * 1024 * 1024)
> #define PCIE_ATR_OB_REGION_SIZE (1 * 1024 * 1024)
>
> +/*
> + * 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_MASK(val, mask, shift) \
> + ((val) << (shift) | (mask) << ((shift) + 16))
> +
> +#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_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
> +
> +#define PCIE_PHY_CONF 0xe220
> +#define PCIE_PHY_STATUS 0xe2a4
> +#define PCIE_PHY_LANEOFF 0xe214
> +
> +struct rockchip_pcie_phy {
> + void *reg_base;
> + struct clk refclk;
> + struct reset_ctl phy_rst;
> + struct rockchip_pcie_phy_ops *ops;
> +};
> +
> +struct rockchip_pcie_phy_ops {
> + int (*init)(struct rockchip_pcie_phy *phy);
> + int (*exit)(struct rockchip_pcie_phy *phy);
> + int (*power_on)(struct rockchip_pcie_phy *phy);
> + int (*power_off)(struct rockchip_pcie_phy *phy);
> +};
> +
> struct rockchip_pcie {
> fdt_addr_t axi_base;
> fdt_addr_t apb_base;
> int first_busno;
> struct udevice *dev;
> + struct rockchip_pcie_phy rk_phy;
> + struct rockchip_pcie_phy *phy;
>
> /* resets */
> struct reset_ctl core_rst;
> @@ -77,3 +127,16 @@ struct rockchip_pcie {
> struct udevice *vpcie1v8;
> struct udevice *vpcie0v9;
> };
> +
> +int rockchip_pcie_phy_get(struct udevice *dev);
> +
> +inline struct rockchip_pcie_phy *pcie_get_phy(struct rockchip_pcie *pcie)
> +{
> + return pcie->phy;
> +}
> +
> +inline
> +struct rockchip_pcie_phy_ops *phy_get_ops(struct rockchip_pcie_phy *phy)
> +{
> + return (struct rockchip_pcie_phy_ops *)phy->ops;
> +}
> diff --git a/drivers/pci/pcie_rockchip_phy.c
> b/drivers/pci/pcie_rockchip_phy.c
> new file mode 100644
> index 0000000000..47f5d6c7e3
> --- /dev/null
> +++ b/drivers/pci/pcie_rockchip_phy.c
> @@ -0,0 +1,205 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Rockchip PCIe PHY driver
> + *
> + * Copyright (c) 2016 Rockchip, Inc.
> + * Copyright (c) 2020 Amarula Solutions(India)
> + */
> +
> +#include <common.h>
> +#include <clk.h>
> +#include <dm.h>
> +#include <dm/device_compat.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>
> +
> +#include "pcie_rockchip.h"
> +
> +DECLARE_GLOBAL_DATA_PTR;
> +
> +static void phy_wr_cfg(struct rockchip_pcie_phy *phy, u32 addr, u32 data)
> +{
> + u32 reg;
> +
> + reg = HIWORD_UPDATE_MASK(data, PHY_CFG_DATA_MASK,
> PHY_CFG_DATA_SHIFT);
> + reg |= HIWORD_UPDATE_MASK(addr, PHY_CFG_ADDR_MASK,
> PHY_CFG_ADDR_SHIFT);
> + writel(reg, phy->reg_base + PCIE_PHY_CONF);
> +
> + udelay(1);
> +
> + reg = HIWORD_UPDATE_MASK(PHY_CFG_WR_ENABLE,
> + PHY_CFG_WR_MASK,
> + PHY_CFG_WR_SHIFT);
> + writel(reg, phy->reg_base + PCIE_PHY_CONF);
> +
> + udelay(1);
> +
> + reg = HIWORD_UPDATE_MASK(PHY_CFG_WR_DISABLE,
> + PHY_CFG_WR_MASK,
> + PHY_CFG_WR_SHIFT);
> + writel(reg, phy->reg_base + PCIE_PHY_CONF);
> +}
> +
> +static int rockchip_pcie_phy_power_on(struct rockchip_pcie_phy *phy)
> +{
> + int ret = 0;
> + u32 reg, status;
> +
> + ret = reset_deassert(&phy->phy_rst);
> + if (ret) {
> + dev_err(dev, "failed to assert phy reset\n");
> + return ret;
> + }
> +
> + reg = HIWORD_UPDATE_MASK(PHY_CFG_PLL_LOCK,
> + PHY_CFG_ADDR_MASK,
> + PHY_CFG_ADDR_SHIFT);
> + writel(reg, phy->reg_base + PCIE_PHY_CONF);
> +
> + reg = HIWORD_UPDATE_MASK(!PHY_LANE_IDLE_OFF,
> + PHY_LANE_IDLE_MASK,
> + PHY_LANE_IDLE_A_SHIFT);
> + writel(reg, phy->reg_base + PCIE_PHY_LANEOFF);
> +
> + ret = -EINVAL;
> + ret = readl_poll_sleep_timeout(phy->reg_base + PCIE_PHY_STATUS,
> + status,
> + status & PHY_PLL_LOCKED,
> + 20 * 1000,
> + 50);
> + if (ret) {
> + dev_err(&phy->dev, "pll lock timeout!\n");
> + goto err_pll_lock;
> + }
> +
> + phy_wr_cfg(phy, PHY_CFG_CLK_TEST, PHY_CFG_SEPE_RATE);
> + phy_wr_cfg(phy, PHY_CFG_CLK_SCC, PHY_CFG_PLL_100M);
> +
> + ret = -ETIMEDOUT;
> + ret = readl_poll_sleep_timeout(phy->reg_base + PCIE_PHY_STATUS,
> + status,
> + !(status & PHY_PLL_OUTPUT),
> + 20 * 1000,
> + 50);
> + if (ret) {
> + dev_err(&phy->dev, "pll output enable timeout!\n");
> + goto err_pll_lock;
> + }
> +
> + reg = HIWORD_UPDATE_MASK(PHY_CFG_PLL_LOCK,
> + PHY_CFG_ADDR_MASK,
> + PHY_CFG_ADDR_SHIFT);
> + writel(reg, phy->reg_base + PCIE_PHY_CONF);
> +
> + ret = -EINVAL;
> + ret = readl_poll_sleep_timeout(phy->reg_base + PCIE_PHY_STATUS,
> + status,
> + status & PHY_PLL_LOCKED,
> + 20 * 1000,
> + 50);
> + if (ret) {
> + dev_err(&phy->dev, "pll relock timeout!\n");
> + goto err_pll_lock;
> + }
> +
> + return 0;
> +
> +err_pll_lock:
> + reset_assert(&phy->phy_rst);
> + return ret;
> +}
> +
> +static int rockchip_pcie_phy_power_off(struct rockchip_pcie_phy *phy)
> +{
> + int ret;
> + u32 reg;
> +
> + reg = HIWORD_UPDATE_MASK(PHY_LANE_IDLE_OFF,
> + PHY_LANE_IDLE_MASK,
> + PHY_LANE_IDLE_A_SHIFT);
> + writel(reg, phy->reg_base + PCIE_PHY_LANEOFF);
> +
> + ret = reset_assert(&phy->phy_rst);
> + if (ret) {
> + dev_err(dev, "failed to assert phy reset\n");
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static int rockchip_pcie_phy_init(struct rockchip_pcie_phy *phy)
> +{
> + int ret;
> +
> + ret = clk_enable(&phy->refclk);
> + if (ret) {
> + dev_err(dev, "failed to enable refclk clock\n");
> + return ret;
> + }
> +
> + ret = reset_assert(&phy->phy_rst);
> + if (ret) {
> + dev_err(dev, "failed to assert phy reset\n");
> + goto err_reset;
> + }
> +
> + return 0;
> +
> +err_reset:
> + clk_disable(&phy->refclk);
> + return ret;
> +}
> +
> +static int rockchip_pcie_phy_exit(struct rockchip_pcie_phy *phy)
> +{
> + clk_disable(&phy->refclk);
> +
> + return 0;
> +}
> +
> +static struct rockchip_pcie_phy_ops 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,
> +};
> +
> +int rockchip_pcie_phy_get(struct udevice *dev)
> +{
> + struct rockchip_pcie *priv = dev_get_priv(dev);
> + struct rockchip_pcie_phy *phy_priv = &priv->rk_phy;
> + ofnode phy_node;
> + u32 phandle;
> + int ret;
> +
> + phandle = dev_read_u32_default(dev, "phys", 0);
> + phy_node = ofnode_get_by_phandle(phandle);
> + if (!ofnode_valid(phy_node)) {
> + dev_err(dev, "failed to found pcie-phy\n");
> + return -ENODEV;
> + }
> +
> + phy_priv->reg_base = syscon_get_first_range(ROCKCHIP_SYSCON_GRF);
> +
> + ret = clk_get_by_index_nodev(phy_node, 0, &phy_priv->refclk);
> + if (ret) {
> + dev_err(dev, "failed to get refclk clock phandle\n");
> + return ret;
> + }
> +
> + ret = reset_get_by_index_nodev(phy_node, 0, &phy_priv->phy_rst);
> + if (ret) {
> + dev_err(dev, "failed to get phy reset phandle\n");
> + return ret;
> + }
> +
> + phy_priv->ops = &pcie_phy_ops;
> + priv->phy = phy_priv;
> +
> + return 0;
> +}
> --
> 2.17.1
>
Tested-by: Suniel Mahesh <sunil at amarulasolutions.com> #roc-rk3399-pc
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