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path: root/drivers/pci/controller/dwc/pcie-qcom-ep.c
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Diffstat (limited to 'drivers/pci/controller/dwc/pcie-qcom-ep.c')
-rw-r--r--drivers/pci/controller/dwc/pcie-qcom-ep.c164
1 files changed, 131 insertions, 33 deletions
diff --git a/drivers/pci/controller/dwc/pcie-qcom-ep.c b/drivers/pci/controller/dwc/pcie-qcom-ep.c
index ec99116ad05c..6d0d1b759ca2 100644
--- a/drivers/pci/controller/dwc/pcie-qcom-ep.c
+++ b/drivers/pci/controller/dwc/pcie-qcom-ep.c
@@ -10,6 +10,7 @@
*/
#include <linux/clk.h>
+#include <linux/debugfs.h>
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/mfd/syscon.h>
@@ -26,6 +27,7 @@
#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
@@ -45,6 +47,11 @@
#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
@@ -83,6 +90,9 @@
#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)
@@ -95,6 +105,7 @@
/* 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 */
@@ -130,21 +141,33 @@ enum qcom_pcie_ep_link_status {
QCOM_PCIE_EP_LINK_DOWN,
};
-static struct clk_bulk_data qcom_pcie_ep_clks[] = {
- { .id = "cfg" },
- { .id = "aux" },
- { .id = "bus_master" },
- { .id = "bus_slave" },
- { .id = "ref" },
- { .id = "sleep" },
- { .id = "slave_q2a" },
-};
-
+/**
+ * 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;
@@ -152,6 +175,10 @@ struct qcom_pcie_ep {
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;
@@ -193,8 +220,10 @@ static int qcom_pcie_ep_core_reset(struct qcom_pcie_ep *pcie_ep)
*/
static void qcom_pcie_ep_configure_tcsr(struct qcom_pcie_ep *pcie_ep)
{
- regmap_write(pcie_ep->perst_map, pcie_ep->perst_en, 0);
- regmap_write(pcie_ep->perst_map, pcie_ep->perst_sep_en, 0);
+ 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)
@@ -227,8 +256,7 @@ static int qcom_pcie_enable_resources(struct qcom_pcie_ep *pcie_ep)
{
int ret;
- ret = clk_bulk_prepare_enable(ARRAY_SIZE(qcom_pcie_ep_clks),
- qcom_pcie_ep_clks);
+ ret = clk_bulk_prepare_enable(pcie_ep->num_clks, pcie_ep->clks);
if (ret)
return ret;
@@ -249,8 +277,7 @@ static int qcom_pcie_enable_resources(struct qcom_pcie_ep *pcie_ep)
err_phy_exit:
phy_exit(pcie_ep->phy);
err_disable_clk:
- clk_bulk_disable_unprepare(ARRAY_SIZE(qcom_pcie_ep_clks),
- qcom_pcie_ep_clks);
+ clk_bulk_disable_unprepare(pcie_ep->num_clks, pcie_ep->clks);
return ret;
}
@@ -259,8 +286,7 @@ 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(ARRAY_SIZE(qcom_pcie_ep_clks),
- qcom_pcie_ep_clks);
+ clk_bulk_disable_unprepare(pcie_ep->num_clks, pcie_ep->clks);
}
static int qcom_pcie_perst_deassert(struct dw_pcie *pci)
@@ -318,8 +344,14 @@ static int qcom_pcie_perst_deassert(struct dw_pcie *pci)
val &= ~PARF_Q2A_FLUSH_EN;
writel_relaxed(val, pcie_ep->parf + PARF_Q2A_FLUSH);
- /* Disable DBI Wakeup, core clock CGC and enable AUX power */
+ /*
+ * 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;
@@ -375,6 +407,11 @@ static int qcom_pcie_perst_deassert(struct dw_pcie *pci)
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 */
@@ -437,11 +474,19 @@ static int qcom_pcie_ep_get_io_resources(struct platform_device *pdev,
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_err(dev, "Failed to parse qcom,perst-regs\n");
- return -EINVAL;
+ dev_dbg(dev, "PERST separation not available\n");
+ return 0;
}
pcie_ep->perst_map = syscon_node_to_regmap(syscon);
@@ -474,14 +519,15 @@ static int qcom_pcie_ep_get_resources(struct platform_device *pdev,
ret = qcom_pcie_ep_get_io_resources(pdev, pcie_ep);
if (ret) {
- dev_err(&pdev->dev, "Failed to get io resources %d\n", ret);
+ dev_err(dev, "Failed to get io resources %d\n", ret);
return ret;
}
- ret = devm_clk_bulk_get(dev, ARRAY_SIZE(qcom_pcie_ep_clks),
- qcom_pcie_ep_clks);
- if (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))
@@ -495,7 +541,7 @@ static int qcom_pcie_ep_get_resources(struct platform_device *pdev,
if (IS_ERR(pcie_ep->wake))
return PTR_ERR(pcie_ep->wake);
- pcie_ep->phy = devm_phy_optional_get(&pdev->dev, "pciephy");
+ pcie_ep->phy = devm_phy_optional_get(dev, "pciephy");
if (IS_ERR(pcie_ep->phy))
ret = PTR_ERR(pcie_ep->phy);
@@ -571,13 +617,13 @@ static irqreturn_t qcom_pcie_ep_perst_irq_thread(int irq, void *data)
static int qcom_pcie_ep_enable_irq_resources(struct platform_device *pdev,
struct qcom_pcie_ep *pcie_ep)
{
- int irq, ret;
+ int ret;
- irq = platform_get_irq_byname(pdev, "global");
- if (irq < 0)
- return irq;
+ 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, irq, NULL,
+ ret = devm_request_threaded_irq(&pdev->dev, pcie_ep->global_irq, NULL,
qcom_pcie_ep_global_irq_thread,
IRQF_ONESHOT,
"global_irq", pcie_ep);
@@ -594,7 +640,7 @@ static int qcom_pcie_ep_enable_irq_resources(struct platform_device *pdev,
"perst_irq", pcie_ep);
if (ret) {
dev_err(&pdev->dev, "Failed to request PERST IRQ\n");
- disable_irq(irq);
+ disable_irq(pcie_ep->global_irq);
return ret;
}
@@ -617,6 +663,37 @@ static int qcom_pcie_ep_raise_irq(struct dw_pcie_ep *ep, u8 func_no,
}
}
+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,
@@ -649,6 +726,7 @@ 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);
@@ -680,8 +758,21 @@ static int qcom_pcie_ep_probe(struct platform_device *pdev)
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);
@@ -692,6 +783,11 @@ 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;
@@ -702,8 +798,10 @@ static int qcom_pcie_ep_remove(struct platform_device *pdev)
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,
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.