diff options
Diffstat (limited to 'drivers/pci/controller/dwc')
| -rw-r--r-- | drivers/pci/controller/dwc/pcie-qcom.c | 55 |
1 files changed, 54 insertions, 1 deletions
diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c index 0180edf3310e..a1d678fe7fa5 100644 --- a/drivers/pci/controller/dwc/pcie-qcom.c +++ b/drivers/pci/controller/dwc/pcie-qcom.c @@ -50,6 +50,9 @@ #define PARF_AXI_MSTR_WR_ADDR_HALT_V2 0x1a8 #define PARF_Q2A_FLUSH 0x1ac #define PARF_LTSSM 0x1b0 +#define PARF_INT_ALL_STATUS 0x224 +#define PARF_INT_ALL_CLEAR 0x228 +#define PARF_INT_ALL_MASK 0x22c #define PARF_SID_OFFSET 0x234 #define PARF_BDF_TRANSLATE_CFG 0x24c #define PARF_SLV_ADDR_SPACE_SIZE 0x358 @@ -121,6 +124,9 @@ /* PARF_LTSSM register fields */ #define LTSSM_EN BIT(8) +/* PARF_INT_ALL_{STATUS/CLEAR/MASK} register fields */ +#define PARF_INT_ALL_LINK_UP BIT(13) + /* PARF_NO_SNOOP_OVERIDE register fields */ #define WR_NO_SNOOP_OVERIDE_EN BIT(1) #define RD_NO_SNOOP_OVERIDE_EN BIT(3) @@ -1488,6 +1494,29 @@ static void qcom_pcie_init_debugfs(struct qcom_pcie *pcie) qcom_pcie_link_transition_count); } +static irqreturn_t qcom_pcie_global_irq_thread(int irq, void *data) +{ + struct qcom_pcie *pcie = data; + struct dw_pcie_rp *pp = &pcie->pci->pp; + struct device *dev = pcie->pci->dev; + u32 status = readl_relaxed(pcie->parf + PARF_INT_ALL_STATUS); + + writel_relaxed(status, pcie->parf + PARF_INT_ALL_CLEAR); + + if (FIELD_GET(PARF_INT_ALL_LINK_UP, status)) { + dev_dbg(dev, "Received Link up event. Starting enumeration!\n"); + /* Rescan the bus to enumerate endpoint devices */ + pci_lock_rescan_remove(); + pci_rescan_bus(pp->bridge->bus); + pci_unlock_rescan_remove(); + } else { + dev_WARN_ONCE(dev, 1, "Received unknown event. INT_STATUS: 0x%08x\n", + status); + } + + return IRQ_HANDLED; +} + static int qcom_pcie_probe(struct platform_device *pdev) { const struct qcom_pcie_cfg *pcie_cfg; @@ -1498,7 +1527,8 @@ static int qcom_pcie_probe(struct platform_device *pdev) struct dw_pcie_rp *pp; struct resource *res; struct dw_pcie *pci; - int ret; + int ret, irq; + char *name; pcie_cfg = of_device_get_match_data(dev); if (!pcie_cfg || !pcie_cfg->ops) { @@ -1617,6 +1647,27 @@ static int qcom_pcie_probe(struct platform_device *pdev) goto err_phy_exit; } + name = devm_kasprintf(dev, GFP_KERNEL, "qcom_pcie_global_irq%d", + pci_domain_nr(pp->bridge->bus)); + if (!name) { + ret = -ENOMEM; + goto err_host_deinit; + } + + irq = platform_get_irq_byname_optional(pdev, "global"); + if (irq > 0) { + ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, + qcom_pcie_global_irq_thread, + IRQF_ONESHOT, name, pcie); + if (ret) { + dev_err_probe(&pdev->dev, ret, + "Failed to request Global IRQ\n"); + goto err_host_deinit; + } + + writel_relaxed(PARF_INT_ALL_LINK_UP, pcie->parf + PARF_INT_ALL_MASK); + } + qcom_pcie_icc_opp_update(pcie); if (pcie->mhi) @@ -1624,6 +1675,8 @@ static int qcom_pcie_probe(struct platform_device *pdev) return 0; +err_host_deinit: + dw_pcie_host_deinit(pp); err_phy_exit: phy_exit(pcie->phy); err_pm_runtime_put: |