diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/pci/Kconfig | 8 | ||||
| -rw-r--r-- | drivers/pci/Makefile | 1 | ||||
| -rw-r--r-- | drivers/pci/pcie_dw_meson.c | 459 |
3 files changed, 468 insertions, 0 deletions
diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig index cacfc4bd253..cdcdd8f456b 100644 --- a/drivers/pci/Kconfig +++ b/drivers/pci/Kconfig @@ -276,6 +276,14 @@ config PCIE_MEDIATEK Say Y here if you want to enable Gen2 PCIe controller, which could be found on MT7623 SoC family. +config PCIE_DW_MESON + bool "Amlogic Meson DesignWare based PCIe controller" + depends on ARCH_MESON + select PCIE_DW_COMMON + help + Say Y here if you want to enable DW PCIe controller support on + Amlogic SoCs. + config PCIE_ROCKCHIP bool "Enable Rockchip PCIe driver" depends on ARCH_ROCKCHIP diff --git a/drivers/pci/Makefile b/drivers/pci/Makefile index e3ca8b27e48..96d61821fe3 100644 --- a/drivers/pci/Makefile +++ b/drivers/pci/Makefile @@ -50,5 +50,6 @@ 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_DW_ROCKCHIP) += pcie_dw_rockchip.o +obj-$(CONFIG_PCIE_DW_MESON) += pcie_dw_meson.o obj-$(CONFIG_PCI_BRCMSTB) += pcie_brcmstb.o obj-$(CONFIG_PCI_OCTEONTX) += pci_octeontx.o diff --git a/drivers/pci/pcie_dw_meson.c b/drivers/pci/pcie_dw_meson.c new file mode 100644 index 00000000000..0525ecbea64 --- /dev/null +++ b/drivers/pci/pcie_dw_meson.c @@ -0,0 +1,459 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Amlogic DesignWare based PCIe host controller driver + * + * Copyright (c) 2021 BayLibre, SAS + * Author: Neil Armstrong <narmstrong@baylibre.com> + * + * Based on pcie_dw_rockchip.c + * Copyright (c) 2021 Rockchip, Inc. + */ + +#include <common.h> +#include <clk.h> +#include <dm.h> +#include <generic-phy.h> +#include <pci.h> +#include <power-domain.h> +#include <reset.h> +#include <syscon.h> +#include <asm/global_data.h> +#include <asm/io.h> +#include <asm-generic/gpio.h> +#include <dm/device_compat.h> +#include <linux/iopoll.h> +#include <linux/delay.h> +#include <linux/log2.h> +#include <linux/bitfield.h> + +#include "pcie_dw_common.h" + +DECLARE_GLOBAL_DATA_PTR; + +/** + * struct meson_pcie - Amlogic Meson DW PCIe controller state + * + * @pci: The common PCIe DW structure + * @meson_cfg_base: The base address of vendor regs + * @phy + * @clk_port + * @clk_general + * @clk_pclk + * @rsts + * @rst_gpio: The #PERST signal for slot + */ +struct meson_pcie { + /* Must be first member of the struct */ + struct pcie_dw dw; + void *meson_cfg_base; + struct phy phy; + struct clk clk_port; + struct clk clk_general; + struct clk clk_pclk; + struct reset_ctl_bulk rsts; + struct gpio_desc rst_gpio; +}; + +#define PCI_EXP_DEVCTL_PAYLOAD 0x00e0 /* Max_Payload_Size */ + +#define PCIE_CAP_MAX_PAYLOAD_SIZE(x) ((x) << 5) +#define PCIE_CAP_MAX_READ_REQ_SIZE(x) ((x) << 12) + +/* PCIe specific config registers */ +#define PCIE_CFG0 0x0 +#define APP_LTSSM_ENABLE BIT(7) + +#define PCIE_CFG_STATUS12 0x30 +#define IS_SMLH_LINK_UP(x) ((x) & (1 << 6)) +#define IS_RDLH_LINK_UP(x) ((x) & (1 << 16)) +#define IS_LTSSM_UP(x) ((((x) >> 10) & 0x1f) == 0x11) + +#define PCIE_CFG_STATUS17 0x44 +#define PM_CURRENT_STATE(x) (((x) >> 7) & 0x1) + +#define WAIT_LINKUP_TIMEOUT 4000 +#define PORT_CLK_RATE 100000000UL +#define MAX_PAYLOAD_SIZE 256 +#define MAX_READ_REQ_SIZE 256 +#define PCIE_RESET_DELAY 500 +#define PCIE_SHARED_RESET 1 +#define PCIE_NORMAL_RESET 0 + +enum pcie_data_rate { + PCIE_GEN1, + PCIE_GEN2, + PCIE_GEN3, + PCIE_GEN4 +}; + +/* Parameters for the waiting for #perst signal */ +#define PERST_WAIT_US 1000000 + +static inline u32 meson_cfg_readl(struct meson_pcie *priv, u32 reg) +{ + return readl(priv->meson_cfg_base + reg); +} + +static inline void meson_cfg_writel(struct meson_pcie *priv, u32 val, u32 reg) +{ + writel(val, priv->meson_cfg_base + reg); +} + +/** + * meson_pcie_configure() - Configure link + * + * @meson_pcie: Pointer to the PCI controller state + * + * Configure the link mode and width + */ +static void meson_pcie_configure(struct meson_pcie *priv) +{ + u32 val; + + dw_pcie_dbi_write_enable(&priv->dw, true); + + val = readl(priv->dw.dbi_base + PCIE_PORT_LINK_CONTROL); + val &= ~PORT_LINK_FAST_LINK_MODE; + val |= PORT_LINK_DLL_LINK_EN; + val &= ~PORT_LINK_MODE_MASK; + val |= PORT_LINK_MODE_1_LANES; + writel(val, priv->dw.dbi_base + PCIE_PORT_LINK_CONTROL); + + val = readl(priv->dw.dbi_base + PCIE_LINK_WIDTH_SPEED_CONTROL); + val &= ~PORT_LOGIC_LINK_WIDTH_MASK; + val |= PORT_LOGIC_LINK_WIDTH_1_LANES; + writel(val, priv->dw.dbi_base + PCIE_LINK_WIDTH_SPEED_CONTROL); + + dw_pcie_dbi_write_enable(&priv->dw, false); +} + +static inline void meson_pcie_enable_ltssm(struct meson_pcie *priv) +{ + u32 val; + + val = meson_cfg_readl(priv, PCIE_CFG0); + val |= APP_LTSSM_ENABLE; + meson_cfg_writel(priv, val, PCIE_CFG0); +} + +static int meson_pcie_wait_link_up(struct meson_pcie *priv) +{ + u32 speed_okay = 0; + u32 cnt = 0; + u32 state12, state17, smlh_up, ltssm_up, rdlh_up; + + do { + state12 = meson_cfg_readl(priv, PCIE_CFG_STATUS12); + state17 = meson_cfg_readl(priv, PCIE_CFG_STATUS17); + smlh_up = IS_SMLH_LINK_UP(state12); + rdlh_up = IS_RDLH_LINK_UP(state12); + ltssm_up = IS_LTSSM_UP(state12); + + if (PM_CURRENT_STATE(state17) < PCIE_GEN3) + speed_okay = 1; + + if (smlh_up) + debug("%s: smlh_link_up is on\n", __func__); + if (rdlh_up) + debug("%s: rdlh_link_up is on\n", __func__); + if (ltssm_up) + debug("%s: ltssm_up is on\n", __func__); + if (speed_okay) + debug("%s: speed_okay\n", __func__); + + if (smlh_up && rdlh_up && ltssm_up && speed_okay) + return 0; + + cnt++; + + udelay(10); + } while (cnt < WAIT_LINKUP_TIMEOUT); + + printf("%s: error: wait linkup timeout\n", __func__); + return -EIO; +} + +/** + * meson_pcie_link_up() - Wait for the link to come up + * + * @meson_pcie: Pointer to the PCI controller state + * @cap_speed: Desired link speed + * + * Return: 1 (true) for active line and negative (false) for no link (timeout) + */ +static int meson_pcie_link_up(struct meson_pcie *priv, u32 cap_speed) +{ + /* DW link configurations */ + meson_pcie_configure(priv); + + /* Reset the device */ + if (dm_gpio_is_valid(&priv->rst_gpio)) { + dm_gpio_set_value(&priv->rst_gpio, 1); + /* + * Minimal is 100ms from spec but we see + * some wired devices need much more, such as 600ms. + * Add a enough delay to cover all cases. + */ + udelay(PERST_WAIT_US); + dm_gpio_set_value(&priv->rst_gpio, 0); + } + + /* Enable LTSSM */ + meson_pcie_enable_ltssm(priv); + + return meson_pcie_wait_link_up(priv); +} + +static int meson_size_to_payload(int size) +{ + /* + * dwc supports 2^(val+7) payload size, which val is 0~5 default to 1. + * So if input size is not 2^order alignment or less than 2^7 or bigger + * than 2^12, just set to default size 2^(1+7). + */ + if (!is_power_of_2(size) || size < 128 || size > 4096) { + debug("%s: payload size %d, set to default 256\n", __func__, size); + return 1; + } + + return fls(size) - 8; +} + +static void meson_set_max_payload(struct meson_pcie *priv, int size) +{ + u32 val; + u16 offset = dm_pci_find_capability(priv->dw.dev, PCI_CAP_ID_EXP); + int max_payload_size = meson_size_to_payload(size); + + dw_pcie_dbi_write_enable(&priv->dw, true); + + val = readl(priv->dw.dbi_base + offset + PCI_EXP_DEVCTL); + val &= ~PCI_EXP_DEVCTL_PAYLOAD; + writel(val, priv->dw.dbi_base + offset + PCI_EXP_DEVCTL); + + val = readl(priv->dw.dbi_base + offset + PCI_EXP_DEVCTL); + val |= PCIE_CAP_MAX_PAYLOAD_SIZE(max_payload_size); + writel(val, priv->dw.dbi_base + PCI_EXP_DEVCTL); + + dw_pcie_dbi_write_enable(&priv->dw, false); +} + +static void meson_set_max_rd_req_size(struct meson_pcie *priv, int size) +{ + u32 val; + u16 offset = dm_pci_find_capability(priv->dw.dev, PCI_CAP_ID_EXP); + int max_rd_req_size = meson_size_to_payload(size); + + dw_pcie_dbi_write_enable(&priv->dw, true); + + val = readl(priv->dw.dbi_base + offset + PCI_EXP_DEVCTL); + val &= ~PCI_EXP_DEVCTL_PAYLOAD; + writel(val, priv->dw.dbi_base + offset + PCI_EXP_DEVCTL); + + val = readl(priv->dw.dbi_base + offset + PCI_EXP_DEVCTL); + val |= PCIE_CAP_MAX_READ_REQ_SIZE(max_rd_req_size); + writel(val, priv->dw.dbi_base + PCI_EXP_DEVCTL); + + dw_pcie_dbi_write_enable(&priv->dw, false); +} + +static int meson_pcie_init_port(struct udevice *dev) +{ + int ret; + struct meson_pcie *priv = dev_get_priv(dev); + + ret = generic_phy_init(&priv->phy); + if (ret) { + dev_err(dev, "failed to init phy (ret=%d)\n", ret); + return ret; + } + + ret = generic_phy_power_on(&priv->phy); + if (ret) { + dev_err(dev, "failed to power on phy (ret=%d)\n", ret); + goto err_exit_phy; + } + + ret = generic_phy_reset(&priv->phy); + if (ret) { + dev_err(dev, "failed to reset phy (ret=%d)\n", ret); + goto err_exit_phy; + } + + ret = reset_assert_bulk(&priv->rsts); + if (ret) { + dev_err(dev, "failed to assert resets (ret=%d)\n", ret); + goto err_power_off_phy; + } + + udelay(PCIE_RESET_DELAY); + + ret = reset_deassert_bulk(&priv->rsts); + if (ret) { + dev_err(dev, "failed to deassert resets (ret=%d)\n", ret); + goto err_power_off_phy; + } + + udelay(PCIE_RESET_DELAY); + + ret = clk_set_rate(&priv->clk_port, PORT_CLK_RATE); + if (ret) { + dev_err(dev, "failed to set port clk rate (ret=%d)\n", ret); + goto err_deassert_bulk; + } + + ret = clk_enable(&priv->clk_general); + if (ret) { + dev_err(dev, "failed to enable clk general (ret=%d)\n", ret); + goto err_deassert_bulk; + } + + ret = clk_enable(&priv->clk_pclk); + if (ret) { + dev_err(dev, "failed to enable pclk (ret=%d)\n", ret); + goto err_deassert_bulk; + } + + meson_set_max_payload(priv, MAX_PAYLOAD_SIZE); + meson_set_max_rd_req_size(priv, MAX_READ_REQ_SIZE); + + pcie_dw_setup_host(&priv->dw); + + ret = meson_pcie_link_up(priv, LINK_SPEED_GEN_2); + if (ret < 0) + goto err_link_up; + + return 0; +err_link_up: + clk_disable(&priv->clk_port); + clk_disable(&priv->clk_general); + clk_disable(&priv->clk_pclk); +err_deassert_bulk: + reset_assert_bulk(&priv->rsts); +err_power_off_phy: + generic_phy_power_off(&priv->phy); +err_exit_phy: + generic_phy_exit(&priv->phy); + + return ret; +} + +static int meson_pcie_parse_dt(struct udevice *dev) +{ + struct meson_pcie *priv = dev_get_priv(dev); + int ret; + + priv->dw.dbi_base = (void *)dev_read_addr_index(dev, 0); + if (!priv->dw.dbi_base) + return -ENODEV; + + dev_dbg(dev, "ELBI address is 0x%p\n", priv->dw.dbi_base); + + priv->meson_cfg_base = (void *)dev_read_addr_index(dev, 1); + if (!priv->meson_cfg_base) + return -ENODEV; + + dev_dbg(dev, "CFG address is 0x%p\n", priv->meson_cfg_base); + + ret = gpio_request_by_name(dev, "reset-gpios", 0, + &priv->rst_gpio, GPIOD_IS_OUT); + if (ret) { + dev_err(dev, "failed to find reset-gpios property\n"); + return ret; + } + + ret = reset_get_bulk(dev, &priv->rsts); + if (ret) { + dev_err(dev, "Can't get reset: %d\n", ret); + return ret; + } + + ret = clk_get_by_name(dev, "port", &priv->clk_port); + if (ret) { + dev_err(dev, "Can't get port clock: %d\n", ret); + return ret; + } + + ret = clk_get_by_name(dev, "general", &priv->clk_general); + if (ret) { + dev_err(dev, "Can't get port clock: %d\n", ret); + return ret; + } + + ret = clk_get_by_name(dev, "pclk", &priv->clk_pclk); + if (ret) { + dev_err(dev, "Can't get port clock: %d\n", ret); + return ret; + } + + ret = generic_phy_get_by_index(dev, 0, &priv->phy); + if (ret) { + dev_err(dev, "failed to get pcie phy (ret=%d)\n", ret); + return ret; + } + + return 0; +} + +/** + * meson_pcie_probe() - Probe the PCIe bus for active link + * + * @dev: A pointer to the device being operated on + * + * Probe for an active link on the PCIe bus and configure the controller + * to enable this port. + * + * Return: 0 on success, else -ENODEV + */ +static int meson_pcie_probe(struct udevice *dev) +{ + struct meson_pcie *priv = dev_get_priv(dev); + struct udevice *ctlr = pci_get_controller(dev); + struct pci_controller *hose = dev_get_uclass_priv(ctlr); + int ret = 0; + + priv->dw.first_busno = dev_seq(dev); + priv->dw.dev = dev; + + ret = meson_pcie_parse_dt(dev); + if (ret) + return ret; + + ret = meson_pcie_init_port(dev); + if (ret) { + dm_gpio_free(dev, &priv->rst_gpio); + return ret; + } + + 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); + + return 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); +} + +static const struct dm_pci_ops meson_pcie_ops = { + .read_config = pcie_dw_read_config, + .write_config = pcie_dw_write_config, +}; + +static const struct udevice_id meson_pcie_ids[] = { + { .compatible = "amlogic,axg-pcie" }, + { .compatible = "amlogic,g12a-pcie" }, + { } +}; + +U_BOOT_DRIVER(meson_dw_pcie) = { + .name = "pcie_dw_meson", + .id = UCLASS_PCI, + .of_match = meson_pcie_ids, + .ops = &meson_pcie_ops, + .probe = meson_pcie_probe, + .priv_auto = sizeof(struct meson_pcie), +}; 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