diff options
| -rw-r--r-- | drivers/pci/Kconfig | 11 | ||||
| -rw-r--r-- | drivers/pci/Makefile | 1 | ||||
| -rw-r--r-- | drivers/pci/pcie_dw_imx.c | 338 |
3 files changed, 350 insertions, 0 deletions
diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig index 463ec47eb92..8d02ab82ad9 100644 --- a/drivers/pci/Kconfig +++ b/drivers/pci/Kconfig @@ -413,4 +413,15 @@ config PCIE_STARFIVE_JH7110 Say Y here if you want to enable PLDA XpressRich PCIe controller support on StarFive JH7110 SoC. +config PCIE_DW_IMX + bool "i.MX DW PCIe controller support" + depends on ARCH_IMX8M + select PCIE_DW_COMMON + select DM_REGULATOR + select REGMAP + select SYSCON + help + Say Y here if you want to enable DW PCIe controller support on + iMX SoCs. + endif diff --git a/drivers/pci/Makefile b/drivers/pci/Makefile index 72ef8b4bc77..2927c519129 100644 --- a/drivers/pci/Makefile +++ b/drivers/pci/Makefile @@ -53,3 +53,4 @@ obj-$(CONFIG_PCIE_UNIPHIER) += pcie_uniphier.o obj-$(CONFIG_PCIE_XILINX_NWL) += pcie-xilinx-nwl.o obj-$(CONFIG_PCIE_PLDA_COMMON) += pcie_plda_common.o obj-$(CONFIG_PCIE_STARFIVE_JH7110) += pcie_starfive_jh7110.o +obj-$(CONFIG_PCIE_DW_IMX) += pcie_dw_imx.o diff --git a/drivers/pci/pcie_dw_imx.c b/drivers/pci/pcie_dw_imx.c new file mode 100644 index 00000000000..a2ee228224b --- /dev/null +++ b/drivers/pci/pcie_dw_imx.c @@ -0,0 +1,338 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2024 Linaro Ltd. + * + * Author: Sumit Garg <sumit.garg@linaro.org> + */ + +#include <asm/io.h> +#include <asm-generic/gpio.h> +#include <clk.h> +#include <dm.h> +#include <dm/device_compat.h> +#include <generic-phy.h> +#include <linux/bitops.h> +#include <linux/delay.h> +#include <linux/err.h> +#include <linux/iopoll.h> +#include <log.h> +#include <pci.h> +#include <power/regulator.h> +#include <regmap.h> +#include <reset.h> +#include <syscon.h> +#include <time.h> + +#include "pcie_dw_common.h" + +#define PCIE_LINK_CAPABILITY 0x7c +#define TARGET_LINK_SPEED_MASK 0xf +#define LINK_SPEED_GEN_1 0x1 +#define LINK_SPEED_GEN_2 0x2 +#define LINK_SPEED_GEN_3 0x3 + +#define PCIE_MISC_CONTROL_1_OFF 0x8bc +#define PCIE_DBI_RO_WR_EN BIT(0) + +#define PCIE_PORT_DEBUG0 0x728 +#define PCIE_PORT_DEBUG1 0x72c +#define PCIE_PORT_DEBUG1_LINK_UP BIT(4) +#define PCIE_PORT_DEBUG1_LINK_IN_TRAINING BIT(29) + +#define PCIE_LINK_UP_TIMEOUT_MS 100 + +#define IOMUXC_GPR14_OFFSET 0x38 +#define IMX8M_GPR_PCIE_CLK_REQ_OVERRIDE_EN BIT(10) +#define IMX8M_GPR_PCIE_CLK_REQ_OVERRIDE BIT(11) + +struct pcie_dw_imx { + /* Must be first member of the struct */ + struct pcie_dw dw; + struct regmap *iomuxc_gpr; + struct clk_bulk clks; + struct gpio_desc reset_gpio; + struct reset_ctl apps_reset; + struct phy phy; + struct udevice *vpcie; +}; + +static void pcie_dw_configure(struct pcie_dw_imx *priv, u32 cap_speed) +{ + dw_pcie_dbi_write_enable(&priv->dw, true); + + clrsetbits_le32(priv->dw.dbi_base + PCIE_LINK_CAPABILITY, + TARGET_LINK_SPEED_MASK, cap_speed); + + dw_pcie_dbi_write_enable(&priv->dw, false); +} + +static void imx_pcie_ltssm_enable(struct pcie_dw_imx *priv) +{ + reset_deassert(&priv->apps_reset); +} + +static void imx_pcie_ltssm_disable(struct pcie_dw_imx *priv) +{ + reset_assert(&priv->apps_reset); +} + +static bool is_link_up(u32 val) +{ + return ((val & PCIE_PORT_DEBUG1_LINK_UP) && + (!(val & PCIE_PORT_DEBUG1_LINK_IN_TRAINING))); +} + +static int wait_link_up(struct pcie_dw_imx *priv) +{ + u32 val; + + return readl_poll_sleep_timeout(priv->dw.dbi_base + PCIE_PORT_DEBUG1, + val, is_link_up(val), 10000, 100000); +} + +static int pcie_link_up(struct pcie_dw_imx *priv, u32 cap_speed) +{ + int ret; + + /* DW pre link configurations */ + pcie_dw_configure(priv, cap_speed); + + /* Initiate link training */ + imx_pcie_ltssm_enable(priv); + + /* Check that link was established */ + ret = wait_link_up(priv); + if (ret) + imx_pcie_ltssm_disable(priv); + + return ret; +} + +static int imx_pcie_assert_core_reset(struct pcie_dw_imx *priv) +{ + if (dm_gpio_is_valid(&priv->reset_gpio)) { + dm_gpio_set_value(&priv->reset_gpio, 1); + mdelay(20); + } + + return reset_assert(&priv->apps_reset); +} + +static int imx_pcie_clk_enable(struct pcie_dw_imx *priv) +{ + int ret; + + ret = clk_enable_bulk(&priv->clks); + if (ret) + return ret; + + /* + * Set the over ride low and enabled make sure that + * REF_CLK is turned on. + */ + regmap_update_bits(priv->iomuxc_gpr, IOMUXC_GPR14_OFFSET, + IMX8M_GPR_PCIE_CLK_REQ_OVERRIDE, 0); + regmap_update_bits(priv->iomuxc_gpr, IOMUXC_GPR14_OFFSET, + IMX8M_GPR_PCIE_CLK_REQ_OVERRIDE_EN, + IMX8M_GPR_PCIE_CLK_REQ_OVERRIDE_EN); + + /* allow the clocks to stabilize */ + udelay(500); + + return 0; +} + +static void imx_pcie_deassert_core_reset(struct pcie_dw_imx *priv) +{ + if (!dm_gpio_is_valid(&priv->reset_gpio)) + return; + + mdelay(100); + dm_gpio_set_value(&priv->reset_gpio, 0); + /* Wait for 100ms after PERST# deassertion (PCIe r5.0, 6.6.1) */ + mdelay(100); +} + +static int pcie_dw_imx_probe(struct udevice *dev) +{ + struct pcie_dw_imx *priv = dev_get_priv(dev); + struct udevice *ctlr = pci_get_controller(dev); + struct pci_controller *hose = dev_get_uclass_priv(ctlr); + int ret; + + if (priv->vpcie) { + ret = regulator_set_enable(priv->vpcie, true); + if (ret) { + dev_err(dev, "failed to enable vpcie regulator\n"); + return ret; + } + } + + ret = imx_pcie_assert_core_reset(priv); + if (ret) { + dev_err(dev, "failed to assert core reset\n"); + return ret; + } + + ret = imx_pcie_clk_enable(priv); + if (ret) { + dev_err(dev, "failed to enable clocks\n"); + goto err_clk; + } + + ret = generic_phy_init(&priv->phy); + if (ret) { + dev_err(dev, "failed to initialize PHY\n"); + goto err_phy_init; + } + + ret = generic_phy_power_on(&priv->phy); + if (ret) { + dev_err(dev, "failed to power on PHY\n"); + goto err_phy_power; + } + + imx_pcie_deassert_core_reset(priv); + + priv->dw.first_busno = dev_seq(dev); + priv->dw.dev = dev; + pcie_dw_setup_host(&priv->dw); + + if (pcie_link_up(priv, LINK_SPEED_GEN_1)) { + printf("PCIE-%d: Link down\n", dev_seq(dev)); + ret = -ENODEV; + goto err_link; + } + + printf("PCIE-%d: Link up (Gen%d-x%d, Bus%d)\n", dev_seq(dev), + pcie_dw_get_link_speed(&priv->dw), + pcie_dw_get_link_width(&priv->dw), + hose->first_busno); + + pcie_dw_prog_outbound_atu_unroll(&priv->dw, PCIE_ATU_REGION_INDEX0, + PCIE_ATU_TYPE_MEM, + priv->dw.mem.phys_start, + priv->dw.mem.bus_start, priv->dw.mem.size); + + return 0; + +err_link: + generic_shutdown_phy(&priv->phy); +err_phy_power: + generic_phy_exit(&priv->phy); +err_phy_init: + clk_disable_bulk(&priv->clks); +err_clk: + imx_pcie_deassert_core_reset(priv); + + return ret; +} + +static int pcie_dw_imx_remove(struct udevice *dev) +{ + struct pcie_dw_imx *priv = dev_get_priv(dev); + + generic_shutdown_phy(&priv->phy); + dm_gpio_free(dev, &priv->reset_gpio); + reset_free(&priv->apps_reset); + clk_release_bulk(&priv->clks); + + return 0; +} + +static int pcie_dw_imx_of_to_plat(struct udevice *dev) +{ + struct pcie_dw_imx *priv = dev_get_priv(dev); + ofnode gpr; + int ret; + + /* Get the controller base address */ + priv->dw.dbi_base = (void *)dev_read_addr_name(dev, "dbi"); + if ((fdt_addr_t)priv->dw.dbi_base == FDT_ADDR_T_NONE) { + dev_err(dev, "failed to get dbi_base address\n"); + return -EINVAL; + } + + /* Get the config space base address and size */ + priv->dw.cfg_base = (void *)dev_read_addr_size_name(dev, "config", + &priv->dw.cfg_size); + if ((fdt_addr_t)priv->dw.cfg_base == FDT_ADDR_T_NONE) { + dev_err(dev, "failed to get cfg_base address\n"); + return -EINVAL; + } + + ret = clk_get_bulk(dev, &priv->clks); + if (ret) { + dev_err(dev, "failed to get PCIe clks\n"); + return ret; + } + + ret = reset_get_by_name(dev, "apps", &priv->apps_reset); + if (ret) { + dev_err(dev, + "Failed to get PCIe apps reset control\n"); + goto err_reset; + } + + ret = gpio_request_by_name(dev, "reset-gpio", 0, &priv->reset_gpio, + GPIOD_IS_OUT | GPIOD_IS_OUT_ACTIVE); + if (ret) { + dev_err(dev, "unable to get reset-gpio\n"); + goto err_gpio; + } + + ret = generic_phy_get_by_name(dev, "pcie-phy", &priv->phy); + if (ret) { + dev_err(dev, "failed to get pcie phy\n"); + goto err_phy; + } + + gpr = ofnode_by_compatible(ofnode_null(), "fsl,imx8mp-iomuxc-gpr"); + if (ofnode_equal(gpr, ofnode_null())) { + dev_err(dev, "unable to find GPR node\n"); + ret = -ENODEV; + goto err_phy; + } + + priv->iomuxc_gpr = syscon_node_to_regmap(gpr); + if (IS_ERR(priv->iomuxc_gpr)) { + dev_err(dev, "unable to find iomuxc registers\n"); + ret = PTR_ERR(priv->iomuxc_gpr); + goto err_phy; + } + + /* vpcie-supply regulator is optional */ + device_get_supply_regulator(dev, "vpcie-supply", &priv->vpcie); + + return 0; + +err_phy: + dm_gpio_free(dev, &priv->reset_gpio); +err_gpio: + reset_free(&priv->apps_reset); +err_reset: + clk_release_bulk(&priv->clks); + + return ret; +} + +static const struct dm_pci_ops pcie_dw_imx_ops = { + .read_config = pcie_dw_read_config, + .write_config = pcie_dw_write_config, +}; + +static const struct udevice_id pcie_dw_imx_ids[] = { + { .compatible = "fsl,imx8mp-pcie" }, + { } +}; + +U_BOOT_DRIVER(pcie_dw_imx) = { + .name = "pcie_dw_imx", + .id = UCLASS_PCI, + .of_match = pcie_dw_imx_ids, + .ops = &pcie_dw_imx_ops, + .of_to_plat = pcie_dw_imx_of_to_plat, + .probe = pcie_dw_imx_probe, + .remove = pcie_dw_imx_remove, + .priv_auto = sizeof(struct pcie_dw_imx), +}; |