| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Stanimir Varbanov | 2011 | 31.82% | 1 | 3.03% |
| Srinivas Kandagatla | 1248 | 19.75% | 5 | 15.15% |
| John Crispin | 1202 | 19.02% | 1 | 3.03% |
| Varadarajan Narayanan | 1180 | 18.67% | 2 | 6.06% |
| Björn Helgaas | 293 | 4.64% | 4 | 12.12% |
| Björn Andersson | 174 | 2.75% | 5 | 15.15% |
| Kishon Vijay Abraham I | 141 | 2.23% | 2 | 6.06% |
| Marc Gonzalez | 28 | 0.44% | 1 | 3.03% |
| Philipp Zabel | 18 | 0.28% | 1 | 3.03% |
| Paul Gortmaker | 7 | 0.11% | 1 | 3.03% |
| Guenter Roeck | 6 | 0.09% | 1 | 3.03% |
| Fabio Estevam | 2 | 0.03% | 1 | 3.03% |
| Joao Pinto | 2 | 0.03% | 1 | 3.03% |
| Fengguang Wu | 2 | 0.03% | 1 | 3.03% |
| Julia Lawall | 1 | 0.02% | 1 | 3.03% |
| Dan Carpenter | 1 | 0.02% | 1 | 3.03% |
| Lorenzo Pieralisi | 1 | 0.02% | 1 | 3.03% |
| Arnd Bergmann | 1 | 0.02% | 1 | 3.03% |
| Colin Ian King | 1 | 0.02% | 1 | 3.03% |
| JiSheng Zhang | 1 | 0.02% | 1 | 3.03% |
| Total | 6320 | 33 |
// SPDX-License-Identifier: GPL-2.0 /* * Qualcomm PCIe root complex driver * * Copyright (c) 2014-2015, The Linux Foundation. All rights reserved. * Copyright 2015 Linaro Limited. * * Author: Stanimir Varbanov <svarbanov@mm-sol.com> */ #include <linux/clk.h> #include <linux/delay.h> #include <linux/gpio/consumer.h> #include <linux/interrupt.h> #include <linux/io.h> #include <linux/iopoll.h> #include <linux/kernel.h> #include <linux/init.h> #include <linux/of_device.h> #include <linux/of_gpio.h> #include <linux/pci.h> #include <linux/pm_runtime.h> #include <linux/platform_device.h> #include <linux/phy/phy.h> #include <linux/regulator/consumer.h> #include <linux/reset.h> #include <linux/slab.h> #include <linux/types.h> #include "pcie-designware.h" #define PCIE20_PARF_SYS_CTRL 0x00 #define MST_WAKEUP_EN BIT(13) #define SLV_WAKEUP_EN BIT(12) #define MSTR_ACLK_CGC_DIS BIT(10) #define SLV_ACLK_CGC_DIS BIT(9) #define CORE_CLK_CGC_DIS BIT(6) #define AUX_PWR_DET BIT(4) #define L23_CLK_RMV_DIS BIT(2) #define L1_CLK_RMV_DIS BIT(1) #define PCIE20_COMMAND_STATUS 0x04 #define CMD_BME_VAL 0x4 #define PCIE20_DEVICE_CONTROL2_STATUS2 0x98 #define PCIE_CAP_CPL_TIMEOUT_DISABLE 0x10 #define PCIE20_PARF_PHY_CTRL 0x40 #define PCIE20_PARF_PHY_REFCLK 0x4C #define PCIE20_PARF_DBI_BASE_ADDR 0x168 #define PCIE20_PARF_SLV_ADDR_SPACE_SIZE 0x16C #define PCIE20_PARF_MHI_CLOCK_RESET_CTRL 0x174 #define PCIE20_PARF_AXI_MSTR_WR_ADDR_HALT 0x178 #define PCIE20_PARF_AXI_MSTR_WR_ADDR_HALT_V2 0x1A8 #define PCIE20_PARF_LTSSM 0x1B0 #define PCIE20_PARF_SID_OFFSET 0x234 #define PCIE20_PARF_BDF_TRANSLATE_CFG 0x24C #define PCIE20_ELBI_SYS_CTRL 0x04 #define PCIE20_ELBI_SYS_CTRL_LT_ENABLE BIT(0) #define PCIE20_AXI_MSTR_RESP_COMP_CTRL0 0x818 #define CFG_REMOTE_RD_REQ_BRIDGE_SIZE_2K 0x4 #define CFG_REMOTE_RD_REQ_BRIDGE_SIZE_4K 0x5 #define PCIE20_AXI_MSTR_RESP_COMP_CTRL1 0x81c #define CFG_BRIDGE_SB_INIT BIT(0) #define PCIE20_CAP 0x70 #define PCIE20_CAP_LINK_CAPABILITIES (PCIE20_CAP + 0xC) #define PCIE20_CAP_ACTIVE_STATE_LINK_PM_SUPPORT (BIT(10) | BIT(11)) #define PCIE20_CAP_LINK_1 (PCIE20_CAP + 0x14) #define PCIE_CAP_LINK1_VAL 0x2FD7F #define PCIE20_PARF_Q2A_FLUSH 0x1AC #define PCIE20_MISC_CONTROL_1_REG 0x8BC #define DBI_RO_WR_EN 1 #define PERST_DELAY_US 1000 #define PCIE20_v3_PARF_SLV_ADDR_SPACE_SIZE 0x358 #define SLV_ADDR_SPACE_SZ 0x10000000 #define QCOM_PCIE_2_1_0_MAX_SUPPLY 3 struct qcom_pcie_resources_2_1_0 { struct clk *iface_clk; struct clk *core_clk; struct clk *phy_clk; struct reset_control *pci_reset; struct reset_control *axi_reset; struct reset_control *ahb_reset; struct reset_control *por_reset; struct reset_control *phy_reset; struct regulator_bulk_data supplies[QCOM_PCIE_2_1_0_MAX_SUPPLY]; }; struct qcom_pcie_resources_1_0_0 { struct clk *iface; struct clk *aux; struct clk *master_bus; struct clk *slave_bus; struct reset_control *core; struct regulator *vdda; }; #define QCOM_PCIE_2_3_2_MAX_SUPPLY 2 struct qcom_pcie_resources_2_3_2 { struct clk *aux_clk; struct clk *master_clk; struct clk *slave_clk; struct clk *cfg_clk; struct clk *pipe_clk; struct regulator_bulk_data supplies[QCOM_PCIE_2_3_2_MAX_SUPPLY]; }; struct qcom_pcie_resources_2_4_0 { struct clk *aux_clk; struct clk *master_clk; struct clk *slave_clk; struct reset_control *axi_m_reset; struct reset_control *axi_s_reset; struct reset_control *pipe_reset; struct reset_control *axi_m_vmid_reset; struct reset_control *axi_s_xpu_reset; struct reset_control *parf_reset; struct reset_control *phy_reset; struct reset_control *axi_m_sticky_reset; struct reset_control *pipe_sticky_reset; struct reset_control *pwr_reset; struct reset_control *ahb_reset; struct reset_control *phy_ahb_reset; }; struct qcom_pcie_resources_2_3_3 { struct clk *iface; struct clk *axi_m_clk; struct clk *axi_s_clk; struct clk *ahb_clk; struct clk *aux_clk; struct reset_control *rst[7]; }; union qcom_pcie_resources { struct qcom_pcie_resources_1_0_0 v1_0_0; struct qcom_pcie_resources_2_1_0 v2_1_0; struct qcom_pcie_resources_2_3_2 v2_3_2; struct qcom_pcie_resources_2_3_3 v2_3_3; struct qcom_pcie_resources_2_4_0 v2_4_0; }; struct qcom_pcie; struct qcom_pcie_ops { int (*get_resources)(struct qcom_pcie *pcie); int (*init)(struct qcom_pcie *pcie); int (*post_init)(struct qcom_pcie *pcie); void (*deinit)(struct qcom_pcie *pcie); void (*post_deinit)(struct qcom_pcie *pcie); void (*ltssm_enable)(struct qcom_pcie *pcie); }; struct qcom_pcie { struct dw_pcie *pci; void __iomem *parf; /* DT parf */ void __iomem *elbi; /* DT elbi */ union qcom_pcie_resources res; struct phy *phy; struct gpio_desc *reset; const struct qcom_pcie_ops *ops; }; #define to_qcom_pcie(x) dev_get_drvdata((x)->dev) static void qcom_ep_reset_assert(struct qcom_pcie *pcie) { gpiod_set_value_cansleep(pcie->reset, 1); usleep_range(PERST_DELAY_US, PERST_DELAY_US + 500); } static void qcom_ep_reset_deassert(struct qcom_pcie *pcie) { gpiod_set_value_cansleep(pcie->reset, 0); usleep_range(PERST_DELAY_US, PERST_DELAY_US + 500); } static int qcom_pcie_establish_link(struct qcom_pcie *pcie) { struct dw_pcie *pci = pcie->pci; if (dw_pcie_link_up(pci)) return 0; /* Enable Link Training state machine */ if (pcie->ops->ltssm_enable) pcie->ops->ltssm_enable(pcie); return dw_pcie_wait_for_link(pci); } static void qcom_pcie_2_1_0_ltssm_enable(struct qcom_pcie *pcie) { u32 val; /* enable link training */ val = readl(pcie->elbi + PCIE20_ELBI_SYS_CTRL); val |= PCIE20_ELBI_SYS_CTRL_LT_ENABLE; writel(val, pcie->elbi + PCIE20_ELBI_SYS_CTRL); } static int qcom_pcie_get_resources_2_1_0(struct qcom_pcie *pcie) { struct qcom_pcie_resources_2_1_0 *res = &pcie->res.v2_1_0; struct dw_pcie *pci = pcie->pci; struct device *dev = pci->dev; int ret; res->supplies[0].supply = "vdda"; res->supplies[1].supply = "vdda_phy"; res->supplies[2].supply = "vdda_refclk"; ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(res->supplies), res->supplies); if (ret) return ret; res->iface_clk = devm_clk_get(dev, "iface"); if (IS_ERR(res->iface_clk)) return PTR_ERR(res->iface_clk); res->core_clk = devm_clk_get(dev, "core"); if (IS_ERR(res->core_clk)) return PTR_ERR(res->core_clk); res->phy_clk = devm_clk_get(dev, "phy"); if (IS_ERR(res->phy_clk)) return PTR_ERR(res->phy_clk); res->pci_reset = devm_reset_control_get_exclusive(dev, "pci"); if (IS_ERR(res->pci_reset)) return PTR_ERR(res->pci_reset); res->axi_reset = devm_reset_control_get_exclusive(dev, "axi"); if (IS_ERR(res->axi_reset)) return PTR_ERR(res->axi_reset); res->ahb_reset = devm_reset_control_get_exclusive(dev, "ahb"); if (IS_ERR(res->ahb_reset)) return PTR_ERR(res->ahb_reset); res->por_reset = devm_reset_control_get_exclusive(dev, "por"); if (IS_ERR(res->por_reset)) return PTR_ERR(res->por_reset); res->phy_reset = devm_reset_control_get_exclusive(dev, "phy"); return PTR_ERR_OR_ZERO(res->phy_reset); } static void qcom_pcie_deinit_2_1_0(struct qcom_pcie *pcie) { struct qcom_pcie_resources_2_1_0 *res = &pcie->res.v2_1_0; reset_control_assert(res->pci_reset); reset_control_assert(res->axi_reset); reset_control_assert(res->ahb_reset); reset_control_assert(res->por_reset); reset_control_assert(res->pci_reset); clk_disable_unprepare(res->iface_clk); clk_disable_unprepare(res->core_clk); clk_disable_unprepare(res->phy_clk); regulator_bulk_disable(ARRAY_SIZE(res->supplies), res->supplies); } static int qcom_pcie_init_2_1_0(struct qcom_pcie *pcie) { struct qcom_pcie_resources_2_1_0 *res = &pcie->res.v2_1_0; struct dw_pcie *pci = pcie->pci; struct device *dev = pci->dev; u32 val; int ret; ret = regulator_bulk_enable(ARRAY_SIZE(res->supplies), res->supplies); if (ret < 0) { dev_err(dev, "cannot enable regulators\n"); return ret; } ret = reset_control_assert(res->ahb_reset); if (ret) { dev_err(dev, "cannot assert ahb reset\n"); goto err_assert_ahb; } ret = clk_prepare_enable(res->iface_clk); if (ret) { dev_err(dev, "cannot prepare/enable iface clock\n"); goto err_assert_ahb; } ret = clk_prepare_enable(res->phy_clk); if (ret) { dev_err(dev, "cannot prepare/enable phy clock\n"); goto err_clk_phy; } ret = clk_prepare_enable(res->core_clk); if (ret) { dev_err(dev, "cannot prepare/enable core clock\n"); goto err_clk_core; } ret = reset_control_deassert(res->ahb_reset); if (ret) { dev_err(dev, "cannot deassert ahb reset\n"); goto err_deassert_ahb; } /* enable PCIe clocks and resets */ val = readl(pcie->parf + PCIE20_PARF_PHY_CTRL); val &= ~BIT(0); writel(val, pcie->parf + PCIE20_PARF_PHY_CTRL); /* enable external reference clock */ val = readl(pcie->parf + PCIE20_PARF_PHY_REFCLK); val |= BIT(16); writel(val, pcie->parf + PCIE20_PARF_PHY_REFCLK); ret = reset_control_deassert(res->phy_reset); if (ret) { dev_err(dev, "cannot deassert phy reset\n"); return ret; } ret = reset_control_deassert(res->pci_reset); if (ret) { dev_err(dev, "cannot deassert pci reset\n"); return ret; } ret = reset_control_deassert(res->por_reset); if (ret) { dev_err(dev, "cannot deassert por reset\n"); return ret; } ret = reset_control_deassert(res->axi_reset); if (ret) { dev_err(dev, "cannot deassert axi reset\n"); return ret; } /* wait for clock acquisition */ usleep_range(1000, 1500); /* Set the Max TLP size to 2K, instead of using default of 4K */ writel(CFG_REMOTE_RD_REQ_BRIDGE_SIZE_2K, pci->dbi_base + PCIE20_AXI_MSTR_RESP_COMP_CTRL0); writel(CFG_BRIDGE_SB_INIT, pci->dbi_base + PCIE20_AXI_MSTR_RESP_COMP_CTRL1); return 0; err_deassert_ahb: clk_disable_unprepare(res->core_clk); err_clk_core: clk_disable_unprepare(res->phy_clk); err_clk_phy: clk_disable_unprepare(res->iface_clk); err_assert_ahb: regulator_bulk_disable(ARRAY_SIZE(res->supplies), res->supplies); return ret; } static int qcom_pcie_get_resources_1_0_0(struct qcom_pcie *pcie) { struct qcom_pcie_resources_1_0_0 *res = &pcie->res.v1_0_0; struct dw_pcie *pci = pcie->pci; struct device *dev = pci->dev; res->vdda = devm_regulator_get(dev, "vdda"); if (IS_ERR(res->vdda)) return PTR_ERR(res->vdda); res->iface = devm_clk_get(dev, "iface"); if (IS_ERR(res->iface)) return PTR_ERR(res->iface); res->aux = devm_clk_get(dev, "aux"); if (IS_ERR(res->aux)) return PTR_ERR(res->aux); res->master_bus = devm_clk_get(dev, "master_bus"); if (IS_ERR(res->master_bus)) return PTR_ERR(res->master_bus); res->slave_bus = devm_clk_get(dev, "slave_bus"); if (IS_ERR(res->slave_bus)) return PTR_ERR(res->slave_bus); res->core = devm_reset_control_get_exclusive(dev, "core"); return PTR_ERR_OR_ZERO(res->core); } static void qcom_pcie_deinit_1_0_0(struct qcom_pcie *pcie) { struct qcom_pcie_resources_1_0_0 *res = &pcie->res.v1_0_0; reset_control_assert(res->core); clk_disable_unprepare(res->slave_bus); clk_disable_unprepare(res->master_bus); clk_disable_unprepare(res->iface); clk_disable_unprepare(res->aux); regulator_disable(res->vdda); } static int qcom_pcie_init_1_0_0(struct qcom_pcie *pcie) { struct qcom_pcie_resources_1_0_0 *res = &pcie->res.v1_0_0; struct dw_pcie *pci = pcie->pci; struct device *dev = pci->dev; int ret; ret = reset_control_deassert(res->core); if (ret) { dev_err(dev, "cannot deassert core reset\n"); return ret; } ret = clk_prepare_enable(res->aux); if (ret) { dev_err(dev, "cannot prepare/enable aux clock\n"); goto err_res; } ret = clk_prepare_enable(res->iface); if (ret) { dev_err(dev, "cannot prepare/enable iface clock\n"); goto err_aux; } ret = clk_prepare_enable(res->master_bus); if (ret) { dev_err(dev, "cannot prepare/enable master_bus clock\n"); goto err_iface; } ret = clk_prepare_enable(res->slave_bus); if (ret) { dev_err(dev, "cannot prepare/enable slave_bus clock\n"); goto err_master; } ret = regulator_enable(res->vdda); if (ret) { dev_err(dev, "cannot enable vdda regulator\n"); goto err_slave; } /* change DBI base address */ writel(0, pcie->parf + PCIE20_PARF_DBI_BASE_ADDR); if (IS_ENABLED(CONFIG_PCI_MSI)) { u32 val = readl(pcie->parf + PCIE20_PARF_AXI_MSTR_WR_ADDR_HALT); val |= BIT(31); writel(val, pcie->parf + PCIE20_PARF_AXI_MSTR_WR_ADDR_HALT); } return 0; err_slave: clk_disable_unprepare(res->slave_bus); err_master: clk_disable_unprepare(res->master_bus); err_iface: clk_disable_unprepare(res->iface); err_aux: clk_disable_unprepare(res->aux); err_res: reset_control_assert(res->core); return ret; } static void qcom_pcie_2_3_2_ltssm_enable(struct qcom_pcie *pcie) { u32 val; /* enable link training */ val = readl(pcie->parf + PCIE20_PARF_LTSSM); val |= BIT(8); writel(val, pcie->parf + PCIE20_PARF_LTSSM); } static int qcom_pcie_get_resources_2_3_2(struct qcom_pcie *pcie) { struct qcom_pcie_resources_2_3_2 *res = &pcie->res.v2_3_2; struct dw_pcie *pci = pcie->pci; struct device *dev = pci->dev; int ret; res->supplies[0].supply = "vdda"; res->supplies[1].supply = "vddpe-3v3"; ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(res->supplies), res->supplies); if (ret) return ret; res->aux_clk = devm_clk_get(dev, "aux"); if (IS_ERR(res->aux_clk)) return PTR_ERR(res->aux_clk); res->cfg_clk = devm_clk_get(dev, "cfg"); if (IS_ERR(res->cfg_clk)) return PTR_ERR(res->cfg_clk); res->master_clk = devm_clk_get(dev, "bus_master"); if (IS_ERR(res->master_clk)) return PTR_ERR(res->master_clk); res->slave_clk = devm_clk_get(dev, "bus_slave"); if (IS_ERR(res->slave_clk)) return PTR_ERR(res->slave_clk); res->pipe_clk = devm_clk_get(dev, "pipe"); return PTR_ERR_OR_ZERO(res->pipe_clk); } static void qcom_pcie_deinit_2_3_2(struct qcom_pcie *pcie) { struct qcom_pcie_resources_2_3_2 *res = &pcie->res.v2_3_2; clk_disable_unprepare(res->slave_clk); clk_disable_unprepare(res->master_clk); clk_disable_unprepare(res->cfg_clk); clk_disable_unprepare(res->aux_clk); regulator_bulk_disable(ARRAY_SIZE(res->supplies), res->supplies); } static void qcom_pcie_post_deinit_2_3_2(struct qcom_pcie *pcie) { struct qcom_pcie_resources_2_3_2 *res = &pcie->res.v2_3_2; clk_disable_unprepare(res->pipe_clk); } static int qcom_pcie_init_2_3_2(struct qcom_pcie *pcie) { struct qcom_pcie_resources_2_3_2 *res = &pcie->res.v2_3_2; struct dw_pcie *pci = pcie->pci; struct device *dev = pci->dev; u32 val; int ret; ret = regulator_bulk_enable(ARRAY_SIZE(res->supplies), res->supplies); if (ret < 0) { dev_err(dev, "cannot enable regulators\n"); return ret; } ret = clk_prepare_enable(res->aux_clk); if (ret) { dev_err(dev, "cannot prepare/enable aux clock\n"); goto err_aux_clk; } ret = clk_prepare_enable(res->cfg_clk); if (ret) { dev_err(dev, "cannot prepare/enable cfg clock\n"); goto err_cfg_clk; } ret = clk_prepare_enable(res->master_clk); if (ret) { dev_err(dev, "cannot prepare/enable master clock\n"); goto err_master_clk; } ret = clk_prepare_enable(res->slave_clk); if (ret) { dev_err(dev, "cannot prepare/enable slave clock\n"); goto err_slave_clk; } /* enable PCIe clocks and resets */ val = readl(pcie->parf + PCIE20_PARF_PHY_CTRL); val &= ~BIT(0); writel(val, pcie->parf + PCIE20_PARF_PHY_CTRL); /* change DBI base address */ writel(0, pcie->parf + PCIE20_PARF_DBI_BASE_ADDR); /* MAC PHY_POWERDOWN MUX DISABLE */ val = readl(pcie->parf + PCIE20_PARF_SYS_CTRL); val &= ~BIT(29); writel(val, pcie->parf + PCIE20_PARF_SYS_CTRL); val = readl(pcie->parf + PCIE20_PARF_MHI_CLOCK_RESET_CTRL); val |= BIT(4); writel(val, pcie->parf + PCIE20_PARF_MHI_CLOCK_RESET_CTRL); val = readl(pcie->parf + PCIE20_PARF_AXI_MSTR_WR_ADDR_HALT_V2); val |= BIT(31); writel(val, pcie->parf + PCIE20_PARF_AXI_MSTR_WR_ADDR_HALT_V2); return 0; err_slave_clk: clk_disable_unprepare(res->master_clk); err_master_clk: clk_disable_unprepare(res->cfg_clk); err_cfg_clk: clk_disable_unprepare(res->aux_clk); err_aux_clk: regulator_bulk_disable(ARRAY_SIZE(res->supplies), res->supplies); return ret; } static int qcom_pcie_post_init_2_3_2(struct qcom_pcie *pcie) { struct qcom_pcie_resources_2_3_2 *res = &pcie->res.v2_3_2; struct dw_pcie *pci = pcie->pci; struct device *dev = pci->dev; int ret; ret = clk_prepare_enable(res->pipe_clk); if (ret) { dev_err(dev, "cannot prepare/enable pipe clock\n"); return ret; } return 0; } static int qcom_pcie_get_resources_2_4_0(struct qcom_pcie *pcie) { struct qcom_pcie_resources_2_4_0 *res = &pcie->res.v2_4_0; struct dw_pcie *pci = pcie->pci; struct device *dev = pci->dev; res->aux_clk = devm_clk_get(dev, "aux"); if (IS_ERR(res->aux_clk)) return PTR_ERR(res->aux_clk); res->master_clk = devm_clk_get(dev, "master_bus"); if (IS_ERR(res->master_clk)) return PTR_ERR(res->master_clk); res->slave_clk = devm_clk_get(dev, "slave_bus"); if (IS_ERR(res->slave_clk)) return PTR_ERR(res->slave_clk); res->axi_m_reset = devm_reset_control_get_exclusive(dev, "axi_m"); if (IS_ERR(res->axi_m_reset)) return PTR_ERR(res->axi_m_reset); res->axi_s_reset = devm_reset_control_get_exclusive(dev, "axi_s"); if (IS_ERR(res->axi_s_reset)) return PTR_ERR(res->axi_s_reset); res->pipe_reset = devm_reset_control_get_exclusive(dev, "pipe"); if (IS_ERR(res->pipe_reset)) return PTR_ERR(res->pipe_reset); res->axi_m_vmid_reset = devm_reset_control_get_exclusive(dev, "axi_m_vmid"); if (IS_ERR(res->axi_m_vmid_reset)) return PTR_ERR(res->axi_m_vmid_reset); res->axi_s_xpu_reset = devm_reset_control_get_exclusive(dev, "axi_s_xpu"); if (IS_ERR(res->axi_s_xpu_reset)) return PTR_ERR(res->axi_s_xpu_reset); res->parf_reset = devm_reset_control_get_exclusive(dev, "parf"); if (IS_ERR(res->parf_reset)) return PTR_ERR(res->parf_reset); res->phy_reset = devm_reset_control_get_exclusive(dev, "phy"); if (IS_ERR(res->phy_reset)) return PTR_ERR(res->phy_reset); res->axi_m_sticky_reset = devm_reset_control_get_exclusive(dev, "axi_m_sticky"); if (IS_ERR(res->axi_m_sticky_reset)) return PTR_ERR(res->axi_m_sticky_reset); res->pipe_sticky_reset = devm_reset_control_get_exclusive(dev, "pipe_sticky"); if (IS_ERR(res->pipe_sticky_reset)) return PTR_ERR(res->pipe_sticky_reset); res->pwr_reset = devm_reset_control_get_exclusive(dev, "pwr"); if (IS_ERR(res->pwr_reset)) return PTR_ERR(res->pwr_reset); res->ahb_reset = devm_reset_control_get_exclusive(dev, "ahb"); if (IS_ERR(res->ahb_reset)) return PTR_ERR(res->ahb_reset); res->phy_ahb_reset = devm_reset_control_get_exclusive(dev, "phy_ahb"); if (IS_ERR(res->phy_ahb_reset)) return PTR_ERR(res->phy_ahb_reset); return 0; } static void qcom_pcie_deinit_2_4_0(struct qcom_pcie *pcie) { struct qcom_pcie_resources_2_4_0 *res = &pcie->res.v2_4_0; reset_control_assert(res->axi_m_reset); reset_control_assert(res->axi_s_reset); reset_control_assert(res->pipe_reset); reset_control_assert(res->pipe_sticky_reset); reset_control_assert(res->phy_reset); reset_control_assert(res->phy_ahb_reset); reset_control_assert(res->axi_m_sticky_reset); reset_control_assert(res->pwr_reset); reset_control_assert(res->ahb_reset); clk_disable_unprepare(res->aux_clk); clk_disable_unprepare(res->master_clk); clk_disable_unprepare(res->slave_clk); } static int qcom_pcie_init_2_4_0(struct qcom_pcie *pcie) { struct qcom_pcie_resources_2_4_0 *res = &pcie->res.v2_4_0; struct dw_pcie *pci = pcie->pci; struct device *dev = pci->dev; u32 val; int ret; ret = reset_control_assert(res->axi_m_reset); if (ret) { dev_err(dev, "cannot assert axi master reset\n"); return ret; } ret = reset_control_assert(res->axi_s_reset); if (ret) { dev_err(dev, "cannot assert axi slave reset\n"); return ret; } usleep_range(10000, 12000); ret = reset_control_assert(res->pipe_reset); if (ret) { dev_err(dev, "cannot assert pipe reset\n"); return ret; } ret = reset_control_assert(res->pipe_sticky_reset); if (ret) { dev_err(dev, "cannot assert pipe sticky reset\n"); return ret; } ret = reset_control_assert(res->phy_reset); if (ret) { dev_err(dev, "cannot assert phy reset\n"); return ret; } ret = reset_control_assert(res->phy_ahb_reset); if (ret) { dev_err(dev, "cannot assert phy ahb reset\n"); return ret; } usleep_range(10000, 12000); ret = reset_control_assert(res->axi_m_sticky_reset); if (ret) { dev_err(dev, "cannot assert axi master sticky reset\n"); return ret; } ret = reset_control_assert(res->pwr_reset); if (ret) { dev_err(dev, "cannot assert power reset\n"); return ret; } ret = reset_control_assert(res->ahb_reset); if (ret) { dev_err(dev, "cannot assert ahb reset\n"); return ret; } usleep_range(10000, 12000); ret = reset_control_deassert(res->phy_ahb_reset); if (ret) { dev_err(dev, "cannot deassert phy ahb reset\n"); return ret; } ret = reset_control_deassert(res->phy_reset); if (ret) { dev_err(dev, "cannot deassert phy reset\n"); goto err_rst_phy; } ret = reset_control_deassert(res->pipe_reset); if (ret) { dev_err(dev, "cannot deassert pipe reset\n"); goto err_rst_pipe; } ret = reset_control_deassert(res->pipe_sticky_reset); if (ret) { dev_err(dev, "cannot deassert pipe sticky reset\n"); goto err_rst_pipe_sticky; } usleep_range(10000, 12000); ret = reset_control_deassert(res->axi_m_reset); if (ret) { dev_err(dev, "cannot deassert axi master reset\n"); goto err_rst_axi_m; } ret = reset_control_deassert(res->axi_m_sticky_reset); if (ret) { dev_err(dev, "cannot deassert axi master sticky reset\n"); goto err_rst_axi_m_sticky; } ret = reset_control_deassert(res->axi_s_reset); if (ret) { dev_err(dev, "cannot deassert axi slave reset\n"); goto err_rst_axi_s; } ret = reset_control_deassert(res->pwr_reset); if (ret) { dev_err(dev, "cannot deassert power reset\n"); goto err_rst_pwr; } ret = reset_control_deassert(res->ahb_reset); if (ret) { dev_err(dev, "cannot deassert ahb reset\n"); goto err_rst_ahb; } usleep_range(10000, 12000); ret = clk_prepare_enable(res->aux_clk); if (ret) { dev_err(dev, "cannot prepare/enable iface clock\n"); goto err_clk_aux; } ret = clk_prepare_enable(res->master_clk); if (ret) { dev_err(dev, "cannot prepare/enable core clock\n"); goto err_clk_axi_m; } ret = clk_prepare_enable(res->slave_clk); if (ret) { dev_err(dev, "cannot prepare/enable phy clock\n"); goto err_clk_axi_s; } /* enable PCIe clocks and resets */ val = readl(pcie->parf + PCIE20_PARF_PHY_CTRL); val &= ~BIT(0); writel(val, pcie->parf + PCIE20_PARF_PHY_CTRL); /* change DBI base address */ writel(0, pcie->parf + PCIE20_PARF_DBI_BASE_ADDR); /* MAC PHY_POWERDOWN MUX DISABLE */ val = readl(pcie->parf + PCIE20_PARF_SYS_CTRL); val &= ~BIT(29); writel(val, pcie->parf + PCIE20_PARF_SYS_CTRL); val = readl(pcie->parf + PCIE20_PARF_MHI_CLOCK_RESET_CTRL); val |= BIT(4); writel(val, pcie->parf + PCIE20_PARF_MHI_CLOCK_RESET_CTRL); val = readl(pcie->parf + PCIE20_PARF_AXI_MSTR_WR_ADDR_HALT_V2); val |= BIT(31); writel(val, pcie->parf + PCIE20_PARF_AXI_MSTR_WR_ADDR_HALT_V2); return 0; err_clk_axi_s: clk_disable_unprepare(res->master_clk); err_clk_axi_m: clk_disable_unprepare(res->aux_clk); err_clk_aux: reset_control_assert(res->ahb_reset); err_rst_ahb: reset_control_assert(res->pwr_reset); err_rst_pwr: reset_control_assert(res->axi_s_reset); err_rst_axi_s: reset_control_assert(res->axi_m_sticky_reset); err_rst_axi_m_sticky: reset_control_assert(res->axi_m_reset); err_rst_axi_m: reset_control_assert(res->pipe_sticky_reset); err_rst_pipe_sticky: reset_control_assert(res->pipe_reset); err_rst_pipe: reset_control_assert(res->phy_reset); err_rst_phy: reset_control_assert(res->phy_ahb_reset); return ret; } static int qcom_pcie_get_resources_2_3_3(struct qcom_pcie *pcie) { struct qcom_pcie_resources_2_3_3 *res = &pcie->res.v2_3_3; struct dw_pcie *pci = pcie->pci; struct device *dev = pci->dev; int i; const char *rst_names[] = { "axi_m", "axi_s", "pipe", "axi_m_sticky", "sticky", "ahb", "sleep", }; res->iface = devm_clk_get(dev, "iface"); if (IS_ERR(res->iface)) return PTR_ERR(res->iface); res->axi_m_clk = devm_clk_get(dev, "axi_m"); if (IS_ERR(res->axi_m_clk)) return PTR_ERR(res->axi_m_clk); res->axi_s_clk = devm_clk_get(dev, "axi_s"); if (IS_ERR(res->axi_s_clk)) return PTR_ERR(res->axi_s_clk); res->ahb_clk = devm_clk_get(dev, "ahb"); if (IS_ERR(res->ahb_clk)) return PTR_ERR(res->ahb_clk); res->aux_clk = devm_clk_get(dev, "aux"); if (IS_ERR(res->aux_clk)) return PTR_ERR(res->aux_clk); for (i = 0; i < ARRAY_SIZE(rst_names); i++) { res->rst[i] = devm_reset_control_get(dev, rst_names[i]); if (IS_ERR(res->rst[i])) return PTR_ERR(res->rst[i]); } return 0; } static void qcom_pcie_deinit_2_3_3(struct qcom_pcie *pcie) { struct qcom_pcie_resources_2_3_3 *res = &pcie->res.v2_3_3; clk_disable_unprepare(res->iface); clk_disable_unprepare(res->axi_m_clk); clk_disable_unprepare(res->axi_s_clk); clk_disable_unprepare(res->ahb_clk); clk_disable_unprepare(res->aux_clk); } static int qcom_pcie_init_2_3_3(struct qcom_pcie *pcie) { struct qcom_pcie_resources_2_3_3 *res = &pcie->res.v2_3_3; struct dw_pcie *pci = pcie->pci; struct device *dev = pci->dev; int i, ret; u32 val; for (i = 0; i < ARRAY_SIZE(res->rst); i++) { ret = reset_control_assert(res->rst[i]); if (ret) { dev_err(dev, "reset #%d assert failed (%d)\n", i, ret); return ret; } } usleep_range(2000, 2500); for (i = 0; i < ARRAY_SIZE(res->rst); i++) { ret = reset_control_deassert(res->rst[i]); if (ret) { dev_err(dev, "reset #%d deassert failed (%d)\n", i, ret); return ret; } } /* * Don't have a way to see if the reset has completed. * Wait for some time. */ usleep_range(2000, 2500); ret = clk_prepare_enable(res->iface); if (ret) { dev_err(dev, "cannot prepare/enable core clock\n"); goto err_clk_iface; } ret = clk_prepare_enable(res->axi_m_clk); if (ret) { dev_err(dev, "cannot prepare/enable core clock\n"); goto err_clk_axi_m; } ret = clk_prepare_enable(res->axi_s_clk); if (ret) { dev_err(dev, "cannot prepare/enable axi slave clock\n"); goto err_clk_axi_s; } ret = clk_prepare_enable(res->ahb_clk); if (ret) { dev_err(dev, "cannot prepare/enable ahb clock\n"); goto err_clk_ahb; } ret = clk_prepare_enable(res->aux_clk); if (ret) { dev_err(dev, "cannot prepare/enable aux clock\n"); goto err_clk_aux; } writel(SLV_ADDR_SPACE_SZ, pcie->parf + PCIE20_v3_PARF_SLV_ADDR_SPACE_SIZE); val = readl(pcie->parf + PCIE20_PARF_PHY_CTRL); val &= ~BIT(0); writel(val, pcie->parf + PCIE20_PARF_PHY_CTRL); writel(0, pcie->parf + PCIE20_PARF_DBI_BASE_ADDR); writel(MST_WAKEUP_EN | SLV_WAKEUP_EN | MSTR_ACLK_CGC_DIS | SLV_ACLK_CGC_DIS | CORE_CLK_CGC_DIS | AUX_PWR_DET | L23_CLK_RMV_DIS | L1_CLK_RMV_DIS, pcie->parf + PCIE20_PARF_SYS_CTRL); writel(0, pcie->parf + PCIE20_PARF_Q2A_FLUSH); writel(CMD_BME_VAL, pci->dbi_base + PCIE20_COMMAND_STATUS); writel(DBI_RO_WR_EN, pci->dbi_base + PCIE20_MISC_CONTROL_1_REG); writel(PCIE_CAP_LINK1_VAL, pci->dbi_base + PCIE20_CAP_LINK_1); val = readl(pci->dbi_base + PCIE20_CAP_LINK_CAPABILITIES); val &= ~PCIE20_CAP_ACTIVE_STATE_LINK_PM_SUPPORT; writel(val, pci->dbi_base + PCIE20_CAP_LINK_CAPABILITIES); writel(PCIE_CAP_CPL_TIMEOUT_DISABLE, pci->dbi_base + PCIE20_DEVICE_CONTROL2_STATUS2); return 0; err_clk_aux: clk_disable_unprepare(res->ahb_clk); err_clk_ahb: clk_disable_unprepare(res->axi_s_clk); err_clk_axi_s: clk_disable_unprepare(res->axi_m_clk); err_clk_axi_m: clk_disable_unprepare(res->iface); err_clk_iface: /* * Not checking for failure, will anyway return * the original failure in 'ret'. */ for (i = 0; i < ARRAY_SIZE(res->rst); i++) reset_control_assert(res->rst[i]); return ret; } static int qcom_pcie_link_up(struct dw_pcie *pci) { u16 val = readw(pci->dbi_base + PCIE20_CAP + PCI_EXP_LNKSTA); return !!(val & PCI_EXP_LNKSTA_DLLLA); } static int qcom_pcie_host_init(struct pcie_port *pp) { struct dw_pcie *pci = to_dw_pcie_from_pp(pp); struct qcom_pcie *pcie = to_qcom_pcie(pci); int ret; qcom_ep_reset_assert(pcie); ret = pcie->ops->init(pcie); if (ret) return ret; ret = phy_power_on(pcie->phy); if (ret) goto err_deinit; if (pcie->ops->post_init) { ret = pcie->ops->post_init(pcie); if (ret) goto err_disable_phy; } dw_pcie_setup_rc(pp); if (IS_ENABLED(CONFIG_PCI_MSI)) dw_pcie_msi_init(pp); qcom_ep_reset_deassert(pcie); ret = qcom_pcie_establish_link(pcie); if (ret) goto err; return 0; err: qcom_ep_reset_assert(pcie); if (pcie->ops->post_deinit) pcie->ops->post_deinit(pcie); err_disable_phy: phy_power_off(pcie->phy); err_deinit: pcie->ops->deinit(pcie); return ret; } static const struct dw_pcie_host_ops qcom_pcie_dw_ops = { .host_init = qcom_pcie_host_init, }; /* Qcom IP rev.: 2.1.0 Synopsys IP rev.: 4.01a */ static const struct qcom_pcie_ops ops_2_1_0 = { .get_resources = qcom_pcie_get_resources_2_1_0, .init = qcom_pcie_init_2_1_0, .deinit = qcom_pcie_deinit_2_1_0, .ltssm_enable = qcom_pcie_2_1_0_ltssm_enable, }; /* Qcom IP rev.: 1.0.0 Synopsys IP rev.: 4.11a */ static const struct qcom_pcie_ops ops_1_0_0 = { .get_resources = qcom_pcie_get_resources_1_0_0, .init = qcom_pcie_init_1_0_0, .deinit = qcom_pcie_deinit_1_0_0, .ltssm_enable = qcom_pcie_2_1_0_ltssm_enable, }; /* Qcom IP rev.: 2.3.2 Synopsys IP rev.: 4.21a */ static const struct qcom_pcie_ops ops_2_3_2 = { .get_resources = qcom_pcie_get_resources_2_3_2, .init = qcom_pcie_init_2_3_2, .post_init = qcom_pcie_post_init_2_3_2, .deinit = qcom_pcie_deinit_2_3_2, .post_deinit = qcom_pcie_post_deinit_2_3_2, .ltssm_enable = qcom_pcie_2_3_2_ltssm_enable, }; /* Qcom IP rev.: 2.4.0 Synopsys IP rev.: 4.20a */ static const struct qcom_pcie_ops ops_2_4_0 = { .get_resources = qcom_pcie_get_resources_2_4_0, .init = qcom_pcie_init_2_4_0, .deinit = qcom_pcie_deinit_2_4_0, .ltssm_enable = qcom_pcie_2_3_2_ltssm_enable, }; /* Qcom IP rev.: 2.3.3 Synopsys IP rev.: 4.30a */ static const struct qcom_pcie_ops ops_2_3_3 = { .get_resources = qcom_pcie_get_resources_2_3_3, .init = qcom_pcie_init_2_3_3, .deinit = qcom_pcie_deinit_2_3_3, .ltssm_enable = qcom_pcie_2_3_2_ltssm_enable, }; static const struct dw_pcie_ops dw_pcie_ops = { .link_up = qcom_pcie_link_up, }; static int qcom_pcie_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct resource *res; struct pcie_port *pp; struct dw_pcie *pci; struct qcom_pcie *pcie; int ret; pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL); if (!pcie) return -ENOMEM; pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL); if (!pci) return -ENOMEM; pm_runtime_enable(dev); ret = pm_runtime_get_sync(dev); if (ret < 0) { pm_runtime_disable(dev); return ret; } pci->dev = dev; pci->ops = &dw_pcie_ops; pp = &pci->pp; pcie->pci = pci; pcie->ops = of_device_get_match_data(dev); pcie->reset = devm_gpiod_get_optional(dev, "perst", GPIOD_OUT_HIGH); if (IS_ERR(pcie->reset)) { ret = PTR_ERR(pcie->reset); goto err_pm_runtime_put; } res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "parf"); pcie->parf = devm_ioremap_resource(dev, res); if (IS_ERR(pcie->parf)) { ret = PTR_ERR(pcie->parf); goto err_pm_runtime_put; } res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dbi"); pci->dbi_base = devm_pci_remap_cfg_resource(dev, res); if (IS_ERR(pci->dbi_base)) { ret = PTR_ERR(pci->dbi_base); goto err_pm_runtime_put; } res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "elbi"); pcie->elbi = devm_ioremap_resource(dev, res); if (IS_ERR(pcie->elbi)) { ret = PTR_ERR(pcie->elbi); goto err_pm_runtime_put; } pcie->phy = devm_phy_optional_get(dev, "pciephy"); if (IS_ERR(pcie->phy)) { ret = PTR_ERR(pcie->phy); goto err_pm_runtime_put; } ret = pcie->ops->get_resources(pcie); if (ret) goto err_pm_runtime_put; pp->ops = &qcom_pcie_dw_ops; if (IS_ENABLED(CONFIG_PCI_MSI)) { pp->msi_irq = platform_get_irq_byname(pdev, "msi"); if (pp->msi_irq < 0) { ret = pp->msi_irq; goto err_pm_runtime_put; } } ret = phy_init(pcie->phy); if (ret) { pm_runtime_disable(&pdev->dev); goto err_pm_runtime_put; } platform_set_drvdata(pdev, pcie); ret = dw_pcie_host_init(pp); if (ret) { dev_err(dev, "cannot initialize host\n"); pm_runtime_disable(&pdev->dev); goto err_pm_runtime_put; } return 0; err_pm_runtime_put: pm_runtime_put(dev); pm_runtime_disable(dev); return ret; } static const struct of_device_id qcom_pcie_match[] = { { .compatible = "qcom,pcie-apq8084", .data = &ops_1_0_0 }, { .compatible = "qcom,pcie-ipq8064", .data = &ops_2_1_0 }, { .compatible = "qcom,pcie-apq8064", .data = &ops_2_1_0 }, { .compatible = "qcom,pcie-msm8996", .data = &ops_2_3_2 }, { .compatible = "qcom,pcie-ipq8074", .data = &ops_2_3_3 }, { .compatible = "qcom,pcie-ipq4019", .data = &ops_2_4_0 }, { } }; static void qcom_fixup_class(struct pci_dev *dev) { dev->class = PCI_CLASS_BRIDGE_PCI << 8; } DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_QCOM, PCI_ANY_ID, qcom_fixup_class); static struct platform_driver qcom_pcie_driver = { .probe = qcom_pcie_probe, .driver = { .name = "qcom-pcie", .suppress_bind_attrs = true, .of_match_table = qcom_pcie_match, }, }; builtin_platform_driver(qcom_pcie_driver);
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