| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Manivannan Sadhasivam | 3287 | 95.14% | 8 | 61.54% |
| Dmitry Eremin-Solenikov | 144 | 4.17% | 2 | 15.38% |
| Yang Yingliang | 20 | 0.58% | 1 | 7.69% |
| Jakub Kiciński | 3 | 0.09% | 1 | 7.69% |
| Rikard Falkeborn | 1 | 0.03% | 1 | 7.69% |
| Total | 3455 | 13 |
// SPDX-License-Identifier: GPL-2.0 /* * Qualcomm PCIe Endpoint controller driver * * Copyright (c) 2020, The Linux Foundation. All rights reserved. * Author: Siddartha Mohanadoss <smohanad@codeaurora.org * * Copyright (c) 2021, Linaro Ltd. * Author: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org */ #include <linux/clk.h> #include <linux/debugfs.h> #include <linux/delay.h> #include <linux/gpio/consumer.h> #include <linux/mfd/syscon.h> #include <linux/phy/phy.h> #include <linux/platform_device.h> #include <linux/pm_domain.h> #include <linux/regmap.h> #include <linux/reset.h> #include <linux/module.h> #include "pcie-designware.h" /* PARF registers */ #define PARF_SYS_CTRL 0x00 #define PARF_DB_CTRL 0x10 #define PARF_PM_CTRL 0x20 #define PARF_MHI_CLOCK_RESET_CTRL 0x174 #define PARF_MHI_BASE_ADDR_LOWER 0x178 #define PARF_MHI_BASE_ADDR_UPPER 0x17c #define PARF_DEBUG_INT_EN 0x190 #define PARF_AXI_MSTR_RD_HALT_NO_WRITES 0x1a4 #define PARF_AXI_MSTR_WR_ADDR_HALT 0x1a8 #define PARF_Q2A_FLUSH 0x1ac #define PARF_LTSSM 0x1b0 #define PARF_CFG_BITS 0x210 #define PARF_INT_ALL_STATUS 0x224 #define PARF_INT_ALL_CLEAR 0x228 #define PARF_INT_ALL_MASK 0x22c #define PARF_SLV_ADDR_MSB_CTRL 0x2c0 #define PARF_DBI_BASE_ADDR 0x350 #define PARF_DBI_BASE_ADDR_HI 0x354 #define PARF_SLV_ADDR_SPACE_SIZE 0x358 #define PARF_SLV_ADDR_SPACE_SIZE_HI 0x35c #define PARF_ATU_BASE_ADDR 0x634 #define PARF_ATU_BASE_ADDR_HI 0x638 #define PARF_SRIS_MODE 0x644 #define PARF_DEBUG_CNT_PM_LINKST_IN_L2 0xc04 #define PARF_DEBUG_CNT_PM_LINKST_IN_L1 0xc0c #define PARF_DEBUG_CNT_PM_LINKST_IN_L0S 0xc10 #define PARF_DEBUG_CNT_AUX_CLK_IN_L1SUB_L1 0xc84 #define PARF_DEBUG_CNT_AUX_CLK_IN_L1SUB_L2 0xc88 #define PARF_DEVICE_TYPE 0x1000 #define PARF_BDF_TO_SID_CFG 0x2c00 /* PARF_INT_ALL_{STATUS/CLEAR/MASK} register fields */ #define PARF_INT_ALL_LINK_DOWN BIT(1) #define PARF_INT_ALL_BME BIT(2) #define PARF_INT_ALL_PM_TURNOFF BIT(3) #define PARF_INT_ALL_DEBUG BIT(4) #define PARF_INT_ALL_LTR BIT(5) #define PARF_INT_ALL_MHI_Q6 BIT(6) #define PARF_INT_ALL_MHI_A7 BIT(7) #define PARF_INT_ALL_DSTATE_CHANGE BIT(8) #define PARF_INT_ALL_L1SUB_TIMEOUT BIT(9) #define PARF_INT_ALL_MMIO_WRITE BIT(10) #define PARF_INT_ALL_CFG_WRITE BIT(11) #define PARF_INT_ALL_BRIDGE_FLUSH_N BIT(12) #define PARF_INT_ALL_LINK_UP BIT(13) #define PARF_INT_ALL_AER_LEGACY BIT(14) #define PARF_INT_ALL_PLS_ERR BIT(15) #define PARF_INT_ALL_PME_LEGACY BIT(16) #define PARF_INT_ALL_PLS_PME BIT(17) /* PARF_BDF_TO_SID_CFG register fields */ #define PARF_BDF_TO_SID_BYPASS BIT(0) /* PARF_DEBUG_INT_EN register fields */ #define PARF_DEBUG_INT_PM_DSTATE_CHANGE BIT(1) #define PARF_DEBUG_INT_CFG_BUS_MASTER_EN BIT(2) #define PARF_DEBUG_INT_RADM_PM_TURNOFF BIT(3) /* PARF_DEVICE_TYPE register fields */ #define PARF_DEVICE_TYPE_EP 0x0 /* PARF_PM_CTRL register fields */ #define PARF_PM_CTRL_REQ_EXIT_L1 BIT(1) #define PARF_PM_CTRL_READY_ENTR_L23 BIT(2) #define PARF_PM_CTRL_REQ_NOT_ENTR_L1 BIT(5) /* PARF_MHI_CLOCK_RESET_CTRL fields */ #define PARF_MSTR_AXI_CLK_EN BIT(1) /* PARF_AXI_MSTR_RD_HALT_NO_WRITES register fields */ #define PARF_AXI_MSTR_RD_HALT_NO_WRITE_EN BIT(0) /* PARF_AXI_MSTR_WR_ADDR_HALT register fields */ #define PARF_AXI_MSTR_WR_ADDR_HALT_EN BIT(31) /* PARF_Q2A_FLUSH register fields */ #define PARF_Q2A_FLUSH_EN BIT(16) /* PARF_SYS_CTRL register fields */ #define PARF_SYS_CTRL_AUX_PWR_DET BIT(4) #define PARF_SYS_CTRL_CORE_CLK_CGC_DIS BIT(6) #define PARF_SYS_CTRL_MSTR_ACLK_CGC_DIS BIT(10) #define PARF_SYS_CTRL_SLV_DBI_WAKE_DISABLE BIT(11) /* PARF_DB_CTRL register fields */ #define PARF_DB_CTRL_INSR_DBNCR_BLOCK BIT(0) #define PARF_DB_CTRL_RMVL_DBNCR_BLOCK BIT(1) #define PARF_DB_CTRL_DBI_WKP_BLOCK BIT(4) #define PARF_DB_CTRL_SLV_WKP_BLOCK BIT(5) #define PARF_DB_CTRL_MST_WKP_BLOCK BIT(6) /* PARF_CFG_BITS register fields */ #define PARF_CFG_BITS_REQ_EXIT_L1SS_MSI_LTR_EN BIT(1) /* ELBI registers */ #define ELBI_SYS_STTS 0x08 /* DBI registers */ #define DBI_CON_STATUS 0x44 /* DBI register fields */ #define DBI_CON_STATUS_POWER_STATE_MASK GENMASK(1, 0) #define XMLH_LINK_UP 0x400 #define CORE_RESET_TIME_US_MIN 1000 #define CORE_RESET_TIME_US_MAX 1005 #define WAKE_DELAY_US 2000 /* 2 ms */ #define to_pcie_ep(x) dev_get_drvdata((x)->dev) enum qcom_pcie_ep_link_status { QCOM_PCIE_EP_LINK_DISABLED, QCOM_PCIE_EP_LINK_ENABLED, QCOM_PCIE_EP_LINK_UP, QCOM_PCIE_EP_LINK_DOWN, }; /** * struct qcom_pcie_ep - Qualcomm PCIe Endpoint Controller * @pci: Designware PCIe controller struct * @parf: Qualcomm PCIe specific PARF register base * @elbi: Designware PCIe specific ELBI register base * @mmio: MMIO register base * @perst_map: PERST regmap * @mmio_res: MMIO region resource * @core_reset: PCIe Endpoint core reset * @reset: PERST# GPIO * @wake: WAKE# GPIO * @phy: PHY controller block * @debugfs: PCIe Endpoint Debugfs directory * @clks: PCIe clocks * @num_clks: PCIe clocks count * @perst_en: Flag for PERST enable * @perst_sep_en: Flag for PERST separation enable * @link_status: PCIe Link status * @global_irq: Qualcomm PCIe specific Global IRQ * @perst_irq: PERST# IRQ */ struct qcom_pcie_ep { struct dw_pcie pci; void __iomem *parf; void __iomem *elbi; void __iomem *mmio; struct regmap *perst_map; struct resource *mmio_res; struct reset_control *core_reset; struct gpio_desc *reset; struct gpio_desc *wake; struct phy *phy; struct dentry *debugfs; struct clk_bulk_data *clks; int num_clks; u32 perst_en; u32 perst_sep_en; enum qcom_pcie_ep_link_status link_status; int global_irq; int perst_irq; }; static int qcom_pcie_ep_core_reset(struct qcom_pcie_ep *pcie_ep) { struct dw_pcie *pci = &pcie_ep->pci; struct device *dev = pci->dev; int ret; ret = reset_control_assert(pcie_ep->core_reset); if (ret) { dev_err(dev, "Cannot assert core reset\n"); return ret; } usleep_range(CORE_RESET_TIME_US_MIN, CORE_RESET_TIME_US_MAX); ret = reset_control_deassert(pcie_ep->core_reset); if (ret) { dev_err(dev, "Cannot de-assert core reset\n"); return ret; } usleep_range(CORE_RESET_TIME_US_MIN, CORE_RESET_TIME_US_MAX); return 0; } /* * Delatch PERST_EN and PERST_SEPARATION_ENABLE with TCSR to avoid * device reset during host reboot and hibernation. The driver is * expected to handle this situation. */ static void qcom_pcie_ep_configure_tcsr(struct qcom_pcie_ep *pcie_ep) { if (pcie_ep->perst_map) { regmap_write(pcie_ep->perst_map, pcie_ep->perst_en, 0); regmap_write(pcie_ep->perst_map, pcie_ep->perst_sep_en, 0); } } static int qcom_pcie_dw_link_up(struct dw_pcie *pci) { struct qcom_pcie_ep *pcie_ep = to_pcie_ep(pci); u32 reg; reg = readl_relaxed(pcie_ep->elbi + ELBI_SYS_STTS); return reg & XMLH_LINK_UP; } static int qcom_pcie_dw_start_link(struct dw_pcie *pci) { struct qcom_pcie_ep *pcie_ep = to_pcie_ep(pci); enable_irq(pcie_ep->perst_irq); return 0; } static void qcom_pcie_dw_stop_link(struct dw_pcie *pci) { struct qcom_pcie_ep *pcie_ep = to_pcie_ep(pci); disable_irq(pcie_ep->perst_irq); } static int qcom_pcie_enable_resources(struct qcom_pcie_ep *pcie_ep) { int ret; ret = clk_bulk_prepare_enable(pcie_ep->num_clks, pcie_ep->clks); if (ret) return ret; ret = qcom_pcie_ep_core_reset(pcie_ep); if (ret) goto err_disable_clk; ret = phy_init(pcie_ep->phy); if (ret) goto err_disable_clk; ret = phy_power_on(pcie_ep->phy); if (ret) goto err_phy_exit; return 0; err_phy_exit: phy_exit(pcie_ep->phy); err_disable_clk: clk_bulk_disable_unprepare(pcie_ep->num_clks, pcie_ep->clks); return ret; } static void qcom_pcie_disable_resources(struct qcom_pcie_ep *pcie_ep) { phy_power_off(pcie_ep->phy); phy_exit(pcie_ep->phy); clk_bulk_disable_unprepare(pcie_ep->num_clks, pcie_ep->clks); } static int qcom_pcie_perst_deassert(struct dw_pcie *pci) { struct qcom_pcie_ep *pcie_ep = to_pcie_ep(pci); struct device *dev = pci->dev; u32 val, offset; int ret; ret = qcom_pcie_enable_resources(pcie_ep); if (ret) { dev_err(dev, "Failed to enable resources: %d\n", ret); return ret; } /* Assert WAKE# to RC to indicate device is ready */ gpiod_set_value_cansleep(pcie_ep->wake, 1); usleep_range(WAKE_DELAY_US, WAKE_DELAY_US + 500); gpiod_set_value_cansleep(pcie_ep->wake, 0); qcom_pcie_ep_configure_tcsr(pcie_ep); /* Disable BDF to SID mapping */ val = readl_relaxed(pcie_ep->parf + PARF_BDF_TO_SID_CFG); val |= PARF_BDF_TO_SID_BYPASS; writel_relaxed(val, pcie_ep->parf + PARF_BDF_TO_SID_CFG); /* Enable debug IRQ */ val = readl_relaxed(pcie_ep->parf + PARF_DEBUG_INT_EN); val |= PARF_DEBUG_INT_RADM_PM_TURNOFF | PARF_DEBUG_INT_CFG_BUS_MASTER_EN | PARF_DEBUG_INT_PM_DSTATE_CHANGE; writel_relaxed(val, pcie_ep->parf + PARF_DEBUG_INT_EN); /* Configure PCIe to endpoint mode */ writel_relaxed(PARF_DEVICE_TYPE_EP, pcie_ep->parf + PARF_DEVICE_TYPE); /* Allow entering L1 state */ val = readl_relaxed(pcie_ep->parf + PARF_PM_CTRL); val &= ~PARF_PM_CTRL_REQ_NOT_ENTR_L1; writel_relaxed(val, pcie_ep->parf + PARF_PM_CTRL); /* Read halts write */ val = readl_relaxed(pcie_ep->parf + PARF_AXI_MSTR_RD_HALT_NO_WRITES); val &= ~PARF_AXI_MSTR_RD_HALT_NO_WRITE_EN; writel_relaxed(val, pcie_ep->parf + PARF_AXI_MSTR_RD_HALT_NO_WRITES); /* Write after write halt */ val = readl_relaxed(pcie_ep->parf + PARF_AXI_MSTR_WR_ADDR_HALT); val |= PARF_AXI_MSTR_WR_ADDR_HALT_EN; writel_relaxed(val, pcie_ep->parf + PARF_AXI_MSTR_WR_ADDR_HALT); /* Q2A flush disable */ val = readl_relaxed(pcie_ep->parf + PARF_Q2A_FLUSH); val &= ~PARF_Q2A_FLUSH_EN; writel_relaxed(val, pcie_ep->parf + PARF_Q2A_FLUSH); /* * Disable Master AXI clock during idle. Do not allow DBI access * to take the core out of L1. Disable core clock gating that * gates PIPE clock from propagating to core clock. Report to the * host that Vaux is present. */ val = readl_relaxed(pcie_ep->parf + PARF_SYS_CTRL); val &= ~PARF_SYS_CTRL_MSTR_ACLK_CGC_DIS; val |= PARF_SYS_CTRL_SLV_DBI_WAKE_DISABLE | PARF_SYS_CTRL_CORE_CLK_CGC_DIS | PARF_SYS_CTRL_AUX_PWR_DET; writel_relaxed(val, pcie_ep->parf + PARF_SYS_CTRL); /* Disable the debouncers */ val = readl_relaxed(pcie_ep->parf + PARF_DB_CTRL); val |= PARF_DB_CTRL_INSR_DBNCR_BLOCK | PARF_DB_CTRL_RMVL_DBNCR_BLOCK | PARF_DB_CTRL_DBI_WKP_BLOCK | PARF_DB_CTRL_SLV_WKP_BLOCK | PARF_DB_CTRL_MST_WKP_BLOCK; writel_relaxed(val, pcie_ep->parf + PARF_DB_CTRL); /* Request to exit from L1SS for MSI and LTR MSG */ val = readl_relaxed(pcie_ep->parf + PARF_CFG_BITS); val |= PARF_CFG_BITS_REQ_EXIT_L1SS_MSI_LTR_EN; writel_relaxed(val, pcie_ep->parf + PARF_CFG_BITS); dw_pcie_dbi_ro_wr_en(pci); /* Set the L0s Exit Latency to 2us-4us = 0x6 */ offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP); val = dw_pcie_readl_dbi(pci, offset + PCI_EXP_LNKCAP); val &= ~PCI_EXP_LNKCAP_L0SEL; val |= FIELD_PREP(PCI_EXP_LNKCAP_L0SEL, 0x6); dw_pcie_writel_dbi(pci, offset + PCI_EXP_LNKCAP, val); /* Set the L1 Exit Latency to be 32us-64 us = 0x6 */ offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP); val = dw_pcie_readl_dbi(pci, offset + PCI_EXP_LNKCAP); val &= ~PCI_EXP_LNKCAP_L1EL; val |= FIELD_PREP(PCI_EXP_LNKCAP_L1EL, 0x6); dw_pcie_writel_dbi(pci, offset + PCI_EXP_LNKCAP, val); dw_pcie_dbi_ro_wr_dis(pci); writel_relaxed(0, pcie_ep->parf + PARF_INT_ALL_MASK); val = PARF_INT_ALL_LINK_DOWN | PARF_INT_ALL_BME | PARF_INT_ALL_PM_TURNOFF | PARF_INT_ALL_DSTATE_CHANGE | PARF_INT_ALL_LINK_UP; writel_relaxed(val, pcie_ep->parf + PARF_INT_ALL_MASK); ret = dw_pcie_ep_init_complete(&pcie_ep->pci.ep); if (ret) { dev_err(dev, "Failed to complete initialization: %d\n", ret); goto err_disable_resources; } /* * The physical address of the MMIO region which is exposed as the BAR * should be written to MHI BASE registers. */ writel_relaxed(pcie_ep->mmio_res->start, pcie_ep->parf + PARF_MHI_BASE_ADDR_LOWER); writel_relaxed(0, pcie_ep->parf + PARF_MHI_BASE_ADDR_UPPER); /* Gate Master AXI clock to MHI bus during L1SS */ val = readl_relaxed(pcie_ep->parf + PARF_MHI_CLOCK_RESET_CTRL); val &= ~PARF_MSTR_AXI_CLK_EN; val = readl_relaxed(pcie_ep->parf + PARF_MHI_CLOCK_RESET_CTRL); dw_pcie_ep_init_notify(&pcie_ep->pci.ep); /* Enable LTSSM */ val = readl_relaxed(pcie_ep->parf + PARF_LTSSM); val |= BIT(8); writel_relaxed(val, pcie_ep->parf + PARF_LTSSM); return 0; err_disable_resources: qcom_pcie_disable_resources(pcie_ep); return ret; } static void qcom_pcie_perst_assert(struct dw_pcie *pci) { struct qcom_pcie_ep *pcie_ep = to_pcie_ep(pci); struct device *dev = pci->dev; if (pcie_ep->link_status == QCOM_PCIE_EP_LINK_DISABLED) { dev_dbg(dev, "Link is already disabled\n"); return; } qcom_pcie_disable_resources(pcie_ep); pcie_ep->link_status = QCOM_PCIE_EP_LINK_DISABLED; } /* Common DWC controller ops */ static const struct dw_pcie_ops pci_ops = { .link_up = qcom_pcie_dw_link_up, .start_link = qcom_pcie_dw_start_link, .stop_link = qcom_pcie_dw_stop_link, }; static int qcom_pcie_ep_get_io_resources(struct platform_device *pdev, struct qcom_pcie_ep *pcie_ep) { struct device *dev = &pdev->dev; struct dw_pcie *pci = &pcie_ep->pci; struct device_node *syscon; struct resource *res; int ret; pcie_ep->parf = devm_platform_ioremap_resource_byname(pdev, "parf"); if (IS_ERR(pcie_ep->parf)) return PTR_ERR(pcie_ep->parf); 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)) return PTR_ERR(pci->dbi_base); pci->dbi_base2 = pci->dbi_base; res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "elbi"); pcie_ep->elbi = devm_pci_remap_cfg_resource(dev, res); if (IS_ERR(pcie_ep->elbi)) return PTR_ERR(pcie_ep->elbi); pcie_ep->mmio_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mmio"); if (!pcie_ep->mmio_res) { dev_err(dev, "Failed to get mmio resource\n"); return -EINVAL; } pcie_ep->mmio = devm_pci_remap_cfg_resource(dev, pcie_ep->mmio_res); if (IS_ERR(pcie_ep->mmio)) return PTR_ERR(pcie_ep->mmio); syscon = of_parse_phandle(dev->of_node, "qcom,perst-regs", 0); if (!syscon) { dev_dbg(dev, "PERST separation not available\n"); return 0; } pcie_ep->perst_map = syscon_node_to_regmap(syscon); of_node_put(syscon); if (IS_ERR(pcie_ep->perst_map)) return PTR_ERR(pcie_ep->perst_map); ret = of_property_read_u32_index(dev->of_node, "qcom,perst-regs", 1, &pcie_ep->perst_en); if (ret < 0) { dev_err(dev, "No Perst Enable offset in syscon\n"); return ret; } ret = of_property_read_u32_index(dev->of_node, "qcom,perst-regs", 2, &pcie_ep->perst_sep_en); if (ret < 0) { dev_err(dev, "No Perst Separation Enable offset in syscon\n"); return ret; } return 0; } static int qcom_pcie_ep_get_resources(struct platform_device *pdev, struct qcom_pcie_ep *pcie_ep) { struct device *dev = &pdev->dev; int ret; ret = qcom_pcie_ep_get_io_resources(pdev, pcie_ep); if (ret) { dev_err(dev, "Failed to get io resources %d\n", ret); return ret; } pcie_ep->num_clks = devm_clk_bulk_get_all(dev, &pcie_ep->clks); if (pcie_ep->num_clks < 0) { dev_err(dev, "Failed to get clocks\n"); return pcie_ep->num_clks; } pcie_ep->core_reset = devm_reset_control_get_exclusive(dev, "core"); if (IS_ERR(pcie_ep->core_reset)) return PTR_ERR(pcie_ep->core_reset); pcie_ep->reset = devm_gpiod_get(dev, "reset", GPIOD_IN); if (IS_ERR(pcie_ep->reset)) return PTR_ERR(pcie_ep->reset); pcie_ep->wake = devm_gpiod_get_optional(dev, "wake", GPIOD_OUT_LOW); if (IS_ERR(pcie_ep->wake)) return PTR_ERR(pcie_ep->wake); pcie_ep->phy = devm_phy_optional_get(dev, "pciephy"); if (IS_ERR(pcie_ep->phy)) ret = PTR_ERR(pcie_ep->phy); return ret; } /* TODO: Notify clients about PCIe state change */ static irqreturn_t qcom_pcie_ep_global_irq_thread(int irq, void *data) { struct qcom_pcie_ep *pcie_ep = data; struct dw_pcie *pci = &pcie_ep->pci; struct device *dev = pci->dev; u32 status = readl_relaxed(pcie_ep->parf + PARF_INT_ALL_STATUS); u32 mask = readl_relaxed(pcie_ep->parf + PARF_INT_ALL_MASK); u32 dstate, val; writel_relaxed(status, pcie_ep->parf + PARF_INT_ALL_CLEAR); status &= mask; if (FIELD_GET(PARF_INT_ALL_LINK_DOWN, status)) { dev_dbg(dev, "Received Linkdown event\n"); pcie_ep->link_status = QCOM_PCIE_EP_LINK_DOWN; } else if (FIELD_GET(PARF_INT_ALL_BME, status)) { dev_dbg(dev, "Received BME event. Link is enabled!\n"); pcie_ep->link_status = QCOM_PCIE_EP_LINK_ENABLED; } else if (FIELD_GET(PARF_INT_ALL_PM_TURNOFF, status)) { dev_dbg(dev, "Received PM Turn-off event! Entering L23\n"); val = readl_relaxed(pcie_ep->parf + PARF_PM_CTRL); val |= PARF_PM_CTRL_READY_ENTR_L23; writel_relaxed(val, pcie_ep->parf + PARF_PM_CTRL); } else if (FIELD_GET(PARF_INT_ALL_DSTATE_CHANGE, status)) { dstate = dw_pcie_readl_dbi(pci, DBI_CON_STATUS) & DBI_CON_STATUS_POWER_STATE_MASK; dev_dbg(dev, "Received D%d state event\n", dstate); if (dstate == 3) { val = readl_relaxed(pcie_ep->parf + PARF_PM_CTRL); val |= PARF_PM_CTRL_REQ_EXIT_L1; writel_relaxed(val, pcie_ep->parf + PARF_PM_CTRL); } } else if (FIELD_GET(PARF_INT_ALL_LINK_UP, status)) { dev_dbg(dev, "Received Linkup event. Enumeration complete!\n"); dw_pcie_ep_linkup(&pci->ep); pcie_ep->link_status = QCOM_PCIE_EP_LINK_UP; } else { dev_dbg(dev, "Received unknown event: %d\n", status); } return IRQ_HANDLED; } static irqreturn_t qcom_pcie_ep_perst_irq_thread(int irq, void *data) { struct qcom_pcie_ep *pcie_ep = data; struct dw_pcie *pci = &pcie_ep->pci; struct device *dev = pci->dev; u32 perst; perst = gpiod_get_value(pcie_ep->reset); if (perst) { dev_dbg(dev, "PERST asserted by host. Shutting down the PCIe link!\n"); qcom_pcie_perst_assert(pci); } else { dev_dbg(dev, "PERST de-asserted by host. Starting link training!\n"); qcom_pcie_perst_deassert(pci); } irq_set_irq_type(gpiod_to_irq(pcie_ep->reset), (perst ? IRQF_TRIGGER_HIGH : IRQF_TRIGGER_LOW)); return IRQ_HANDLED; } static int qcom_pcie_ep_enable_irq_resources(struct platform_device *pdev, struct qcom_pcie_ep *pcie_ep) { int ret; pcie_ep->global_irq = platform_get_irq_byname(pdev, "global"); if (pcie_ep->global_irq < 0) return pcie_ep->global_irq; ret = devm_request_threaded_irq(&pdev->dev, pcie_ep->global_irq, NULL, qcom_pcie_ep_global_irq_thread, IRQF_ONESHOT, "global_irq", pcie_ep); if (ret) { dev_err(&pdev->dev, "Failed to request Global IRQ\n"); return ret; } pcie_ep->perst_irq = gpiod_to_irq(pcie_ep->reset); irq_set_status_flags(pcie_ep->perst_irq, IRQ_NOAUTOEN); ret = devm_request_threaded_irq(&pdev->dev, pcie_ep->perst_irq, NULL, qcom_pcie_ep_perst_irq_thread, IRQF_TRIGGER_HIGH | IRQF_ONESHOT, "perst_irq", pcie_ep); if (ret) { dev_err(&pdev->dev, "Failed to request PERST IRQ\n"); disable_irq(pcie_ep->global_irq); return ret; } return 0; } static int qcom_pcie_ep_raise_irq(struct dw_pcie_ep *ep, u8 func_no, enum pci_epc_irq_type type, u16 interrupt_num) { struct dw_pcie *pci = to_dw_pcie_from_ep(ep); switch (type) { case PCI_EPC_IRQ_LEGACY: return dw_pcie_ep_raise_legacy_irq(ep, func_no); case PCI_EPC_IRQ_MSI: return dw_pcie_ep_raise_msi_irq(ep, func_no, interrupt_num); default: dev_err(pci->dev, "Unknown IRQ type\n"); return -EINVAL; } } static int qcom_pcie_ep_link_transition_count(struct seq_file *s, void *data) { struct qcom_pcie_ep *pcie_ep = (struct qcom_pcie_ep *) dev_get_drvdata(s->private); seq_printf(s, "L0s transition count: %u\n", readl_relaxed(pcie_ep->mmio + PARF_DEBUG_CNT_PM_LINKST_IN_L0S)); seq_printf(s, "L1 transition count: %u\n", readl_relaxed(pcie_ep->mmio + PARF_DEBUG_CNT_PM_LINKST_IN_L1)); seq_printf(s, "L1.1 transition count: %u\n", readl_relaxed(pcie_ep->mmio + PARF_DEBUG_CNT_AUX_CLK_IN_L1SUB_L1)); seq_printf(s, "L1.2 transition count: %u\n", readl_relaxed(pcie_ep->mmio + PARF_DEBUG_CNT_AUX_CLK_IN_L1SUB_L2)); seq_printf(s, "L2 transition count: %u\n", readl_relaxed(pcie_ep->mmio + PARF_DEBUG_CNT_PM_LINKST_IN_L2)); return 0; } static void qcom_pcie_ep_init_debugfs(struct qcom_pcie_ep *pcie_ep) { struct dw_pcie *pci = &pcie_ep->pci; debugfs_create_devm_seqfile(pci->dev, "link_transition_count", pcie_ep->debugfs, qcom_pcie_ep_link_transition_count); } static const struct pci_epc_features qcom_pcie_epc_features = { .linkup_notifier = true, .core_init_notifier = true, .msi_capable = true, .msix_capable = false, }; static const struct pci_epc_features * qcom_pcie_epc_get_features(struct dw_pcie_ep *pci_ep) { return &qcom_pcie_epc_features; } static void qcom_pcie_ep_init(struct dw_pcie_ep *ep) { struct dw_pcie *pci = to_dw_pcie_from_ep(ep); enum pci_barno bar; for (bar = BAR_0; bar <= BAR_5; bar++) dw_pcie_ep_reset_bar(pci, bar); } static const struct dw_pcie_ep_ops pci_ep_ops = { .ep_init = qcom_pcie_ep_init, .raise_irq = qcom_pcie_ep_raise_irq, .get_features = qcom_pcie_epc_get_features, }; static int qcom_pcie_ep_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct qcom_pcie_ep *pcie_ep; char *name; int ret; pcie_ep = devm_kzalloc(dev, sizeof(*pcie_ep), GFP_KERNEL); if (!pcie_ep) return -ENOMEM; pcie_ep->pci.dev = dev; pcie_ep->pci.ops = &pci_ops; pcie_ep->pci.ep.ops = &pci_ep_ops; platform_set_drvdata(pdev, pcie_ep); ret = qcom_pcie_ep_get_resources(pdev, pcie_ep); if (ret) return ret; ret = qcom_pcie_enable_resources(pcie_ep); if (ret) { dev_err(dev, "Failed to enable resources: %d\n", ret); return ret; } ret = dw_pcie_ep_init(&pcie_ep->pci.ep); if (ret) { dev_err(dev, "Failed to initialize endpoint: %d\n", ret); goto err_disable_resources; } ret = qcom_pcie_ep_enable_irq_resources(pdev, pcie_ep); if (ret) goto err_disable_resources; name = devm_kasprintf(dev, GFP_KERNEL, "%pOFP", dev->of_node); if (!name) { ret = -ENOMEM; goto err_disable_irqs; } pcie_ep->debugfs = debugfs_create_dir(name, NULL); qcom_pcie_ep_init_debugfs(pcie_ep); return 0; err_disable_irqs: disable_irq(pcie_ep->global_irq); disable_irq(pcie_ep->perst_irq); err_disable_resources: qcom_pcie_disable_resources(pcie_ep); return ret; } static int qcom_pcie_ep_remove(struct platform_device *pdev) { struct qcom_pcie_ep *pcie_ep = platform_get_drvdata(pdev); disable_irq(pcie_ep->global_irq); disable_irq(pcie_ep->perst_irq); debugfs_remove_recursive(pcie_ep->debugfs); if (pcie_ep->link_status == QCOM_PCIE_EP_LINK_DISABLED) return 0; qcom_pcie_disable_resources(pcie_ep); return 0; } static const struct of_device_id qcom_pcie_ep_match[] = { { .compatible = "qcom,sdx55-pcie-ep", }, { .compatible = "qcom,sm8450-pcie-ep", }, { } }; MODULE_DEVICE_TABLE(of, qcom_pcie_ep_match); static struct platform_driver qcom_pcie_ep_driver = { .probe = qcom_pcie_ep_probe, .remove = qcom_pcie_ep_remove, .driver = { .name = "qcom-pcie-ep", .of_match_table = qcom_pcie_ep_match, }, }; builtin_platform_driver(qcom_pcie_ep_driver); MODULE_AUTHOR("Siddartha Mohanadoss <smohanad@codeaurora.org>"); MODULE_AUTHOR("Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>"); MODULE_DESCRIPTION("Qualcomm PCIe Endpoint controller driver"); MODULE_LICENSE("GPL v2");
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