diff options
Diffstat (limited to 'drivers/phy/rockchip/phy-rockchip-snps-pcie3.c')
| -rw-r--r-- | drivers/phy/rockchip/phy-rockchip-snps-pcie3.c | 323 |
1 files changed, 323 insertions, 0 deletions
diff --git a/drivers/phy/rockchip/phy-rockchip-snps-pcie3.c b/drivers/phy/rockchip/phy-rockchip-snps-pcie3.c new file mode 100644 index 0000000000..121e5961ce --- /dev/null +++ b/drivers/phy/rockchip/phy-rockchip-snps-pcie3.c @@ -0,0 +1,323 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Rockchip PCIE3.0 phy driver + * + * Copyright (C) 2022 Rockchip Electronics Co., Ltd. + */ + +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/io.h> +#include <linux/iopoll.h> +#include <linux/kernel.h> +#include <linux/mfd/syscon.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/phy/pcie.h> +#include <linux/phy/phy.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> +#include <linux/reset.h> + +/* Register for RK3568 */ +#define GRF_PCIE30PHY_CON1 0x4 +#define GRF_PCIE30PHY_CON6 0x18 +#define GRF_PCIE30PHY_CON9 0x24 +#define GRF_PCIE30PHY_DA_OCM (BIT(15) | BIT(31)) +#define GRF_PCIE30PHY_STATUS0 0x80 +#define GRF_PCIE30PHY_WR_EN (0xf << 16) +#define SRAM_INIT_DONE(reg) (reg & BIT(14)) + +#define RK3568_BIFURCATION_LANE_0_1 BIT(0) + +/* Register for RK3588 */ +#define PHP_GRF_PCIESEL_CON 0x100 +#define RK3588_PCIE3PHY_GRF_CMN_CON0 0x0 +#define RK3588_PCIE3PHY_GRF_PHY0_STATUS1 0x904 +#define RK3588_PCIE3PHY_GRF_PHY1_STATUS1 0xa04 +#define RK3588_SRAM_INIT_DONE(reg) (reg & BIT(0)) + +#define RK3588_BIFURCATION_LANE_0_1 BIT(0) +#define RK3588_BIFURCATION_LANE_2_3 BIT(1) +#define RK3588_LANE_AGGREGATION BIT(2) + +struct rockchip_p3phy_ops; + +struct rockchip_p3phy_priv { + const struct rockchip_p3phy_ops *ops; + void __iomem *mmio; + /* mode: RC, EP */ + int mode; + /* pcie30_phymode: Aggregation, Bifurcation */ + int pcie30_phymode; + struct regmap *phy_grf; + struct regmap *pipe_grf; + struct reset_control *p30phy; + struct phy *phy; + struct clk_bulk_data *clks; + int num_clks; + int num_lanes; + u32 lanes[4]; +}; + +struct rockchip_p3phy_ops { + int (*phy_init)(struct rockchip_p3phy_priv *priv); +}; + +static int rockchip_p3phy_set_mode(struct phy *phy, enum phy_mode mode, int submode) +{ + struct rockchip_p3phy_priv *priv = phy_get_drvdata(phy); + + /* Actually We don't care EP/RC mode, but just record it */ + switch (submode) { + case PHY_MODE_PCIE_RC: + priv->mode = PHY_MODE_PCIE_RC; + break; + case PHY_MODE_PCIE_EP: + priv->mode = PHY_MODE_PCIE_EP; + break; + default: + dev_err(&phy->dev, "%s, invalid mode\n", __func__); + return -EINVAL; + } + + return 0; +} + +static int rockchip_p3phy_rk3568_init(struct rockchip_p3phy_priv *priv) +{ + struct phy *phy = priv->phy; + bool bifurcation = false; + int ret; + u32 reg; + + /* Deassert PCIe PMA output clamp mode */ + regmap_write(priv->phy_grf, GRF_PCIE30PHY_CON9, GRF_PCIE30PHY_DA_OCM); + + for (int i = 0; i < priv->num_lanes; i++) { + dev_info(&phy->dev, "lane number %d, val %d\n", i, priv->lanes[i]); + if (priv->lanes[i] > 1) + bifurcation = true; + } + + /* Set bifurcation if needed, and it doesn't care RC/EP */ + if (bifurcation) { + dev_info(&phy->dev, "bifurcation enabled\n"); + regmap_write(priv->phy_grf, GRF_PCIE30PHY_CON6, + GRF_PCIE30PHY_WR_EN | RK3568_BIFURCATION_LANE_0_1); + regmap_write(priv->phy_grf, GRF_PCIE30PHY_CON1, + GRF_PCIE30PHY_DA_OCM); + } else { + dev_dbg(&phy->dev, "bifurcation disabled\n"); + regmap_write(priv->phy_grf, GRF_PCIE30PHY_CON6, + GRF_PCIE30PHY_WR_EN & ~RK3568_BIFURCATION_LANE_0_1); + } + + reset_control_deassert(priv->p30phy); + + ret = regmap_read_poll_timeout(priv->phy_grf, + GRF_PCIE30PHY_STATUS0, + reg, SRAM_INIT_DONE(reg), + 0, 500); + if (ret) + dev_err(&priv->phy->dev, "%s: lock failed 0x%x, check input refclk and power supply\n", + __func__, reg); + return ret; +} + +static const struct rockchip_p3phy_ops rk3568_ops = { + .phy_init = rockchip_p3phy_rk3568_init, +}; + +static int rockchip_p3phy_rk3588_init(struct rockchip_p3phy_priv *priv) +{ + u32 reg = 0; + u8 mode = 0; + int ret; + + /* Deassert PCIe PMA output clamp mode */ + regmap_write(priv->phy_grf, RK3588_PCIE3PHY_GRF_CMN_CON0, BIT(8) | BIT(24)); + + /* Set bifurcation if needed */ + for (int i = 0; i < priv->num_lanes; i++) { + if (!priv->lanes[i]) + mode |= (BIT(i) << 3); + + if (priv->lanes[i] > 1) + mode |= (BIT(i) >> 1); + } + + if (!mode) + reg = RK3588_LANE_AGGREGATION; + else { + if (mode & (BIT(0) | BIT(1))) + reg |= RK3588_BIFURCATION_LANE_0_1; + + if (mode & (BIT(2) | BIT(3))) + reg |= RK3588_BIFURCATION_LANE_2_3; + } + + regmap_write(priv->phy_grf, RK3588_PCIE3PHY_GRF_CMN_CON0, (0x7<<16) | reg); + + /* Set pcie1ln_sel in PHP_GRF_PCIESEL_CON */ + if (!IS_ERR(priv->pipe_grf)) { + reg = (mode & (BIT(6) | BIT(7))) >> 6; + if (reg) + regmap_write(priv->pipe_grf, PHP_GRF_PCIESEL_CON, + (reg << 16) | reg); + } + + reset_control_deassert(priv->p30phy); + + ret = regmap_read_poll_timeout(priv->phy_grf, + RK3588_PCIE3PHY_GRF_PHY0_STATUS1, + reg, RK3588_SRAM_INIT_DONE(reg), + 0, 500); + ret |= regmap_read_poll_timeout(priv->phy_grf, + RK3588_PCIE3PHY_GRF_PHY1_STATUS1, + reg, RK3588_SRAM_INIT_DONE(reg), + 0, 500); + if (ret) + dev_err(&priv->phy->dev, "lock failed 0x%x, check input refclk and power supply\n", + reg); + return ret; +} + +static const struct rockchip_p3phy_ops rk3588_ops = { + .phy_init = rockchip_p3phy_rk3588_init, +}; + +static int rochchip_p3phy_init(struct phy *phy) +{ + struct rockchip_p3phy_priv *priv = phy_get_drvdata(phy); + int ret; + + ret = clk_bulk_prepare_enable(priv->num_clks, priv->clks); + if (ret) { + dev_err(&priv->phy->dev, "failed to enable PCIe bulk clks %d\n", ret); + return ret; + } + + reset_control_assert(priv->p30phy); + udelay(1); + + if (priv->ops->phy_init) { + ret = priv->ops->phy_init(priv); + if (ret) + clk_bulk_disable_unprepare(priv->num_clks, priv->clks); + } + + return ret; +} + +static int rochchip_p3phy_exit(struct phy *phy) +{ + struct rockchip_p3phy_priv *priv = phy_get_drvdata(phy); + + clk_bulk_disable_unprepare(priv->num_clks, priv->clks); + reset_control_assert(priv->p30phy); + return 0; +} + +static const struct phy_ops rochchip_p3phy_ops = { + .init = rochchip_p3phy_init, + .exit = rochchip_p3phy_exit, + .set_mode = rockchip_p3phy_set_mode, + .owner = THIS_MODULE, +}; + +static int rockchip_p3phy_probe(struct platform_device *pdev) +{ + struct phy_provider *phy_provider; + struct device *dev = &pdev->dev; + struct rockchip_p3phy_priv *priv; + struct device_node *np = dev->of_node; + int ret; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->mmio = devm_platform_get_and_ioremap_resource(pdev, 0, NULL); + if (IS_ERR(priv->mmio)) { + ret = PTR_ERR(priv->mmio); + return ret; + } + + priv->ops = of_device_get_match_data(&pdev->dev); + if (!priv->ops) { + dev_err(dev, "no of match data provided\n"); + return -EINVAL; + } + + priv->phy_grf = syscon_regmap_lookup_by_phandle(np, "rockchip,phy-grf"); + if (IS_ERR(priv->phy_grf)) { + dev_err(dev, "failed to find rockchip,phy_grf regmap\n"); + return PTR_ERR(priv->phy_grf); + } + + if (of_device_is_compatible(np, "rockchip,rk3588-pcie3-phy")) { + priv->pipe_grf = + syscon_regmap_lookup_by_phandle(dev->of_node, + "rockchip,pipe-grf"); + if (IS_ERR(priv->pipe_grf)) + dev_info(dev, "failed to find rockchip,pipe_grf regmap\n"); + } else { + priv->pipe_grf = NULL; + } + + priv->num_lanes = of_property_read_variable_u32_array(dev->of_node, "data-lanes", + priv->lanes, 2, + ARRAY_SIZE(priv->lanes)); + + /* if no data-lanes assume aggregation */ + if (priv->num_lanes == -EINVAL) { + dev_dbg(dev, "no data-lanes property found\n"); + priv->num_lanes = 1; + priv->lanes[0] = 1; + } else if (priv->num_lanes < 0) { + dev_err(dev, "failed to read data-lanes property %d\n", priv->num_lanes); + return priv->num_lanes; + } + + priv->phy = devm_phy_create(dev, NULL, &rochchip_p3phy_ops); + if (IS_ERR(priv->phy)) { + dev_err(dev, "failed to create combphy\n"); + return PTR_ERR(priv->phy); + } + + priv->p30phy = devm_reset_control_get_optional_exclusive(dev, "phy"); + if (IS_ERR(priv->p30phy)) { + return dev_err_probe(dev, PTR_ERR(priv->p30phy), + "failed to get phy reset control\n"); + } + if (!priv->p30phy) + dev_info(dev, "no phy reset control specified\n"); + + priv->num_clks = devm_clk_bulk_get_all(dev, &priv->clks); + if (priv->num_clks < 1) + return -ENODEV; + + dev_set_drvdata(dev, priv); + phy_set_drvdata(priv->phy, priv); + phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate); + return PTR_ERR_OR_ZERO(phy_provider); +} + +static const struct of_device_id rockchip_p3phy_of_match[] = { + { .compatible = "rockchip,rk3568-pcie3-phy", .data = &rk3568_ops }, + { .compatible = "rockchip,rk3588-pcie3-phy", .data = &rk3588_ops }, + { }, +}; +MODULE_DEVICE_TABLE(of, rockchip_p3phy_of_match); + +static struct platform_driver rockchip_p3phy_driver = { + .probe = rockchip_p3phy_probe, + .driver = { + .name = "rockchip-snps-pcie3-phy", + .of_match_table = rockchip_p3phy_of_match, + }, +}; +module_platform_driver(rockchip_p3phy_driver); +MODULE_DESCRIPTION("Rockchip Synopsys PCIe 3.0 PHY driver"); +MODULE_LICENSE("GPL"); |