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Subject[PATCH V2 6/7] PCI: qcom: Add ipq8074 PCIe controller support
Date
Add support for PCIe Gen3 port found in ipq8074 devices.

Signed-off-by: Sivaprakash Murugesan <sivaprak@codeaurora.org>
---
drivers/pci/controller/dwc/pcie-qcom.c | 177 ++++++++++++++++++++++++++++++++-
1 file changed, 176 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index e1b5651..3bddfcff 100644
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -40,6 +40,14 @@
#define L23_CLK_RMV_DIS BIT(2)
#define L1_CLK_RMV_DIS BIT(1)

+#define PCIE_ATU_CR1_OUTBOUND_6_GEN3 0xC00
+#define PCIE_ATU_CR2_OUTBOUND_6_GEN3 0xC04
+#define PCIE_ATU_LIMIT_OUTBOUND_6_GEN3 0xC10
+#define PCIE_ATU_CR1_OUTBOUND_7_GEN3 0xE00
+#define PCIE_ATU_CR2_OUTBOUND_7_GEN3 0xE04
+#define PCIE_ATU_LOWER_BASE_OUTBOUND_7_GEN3 0xE08
+#define PCIE_ATU_LIMIT_OUTBOUND_7_GEN3 0xE10
+
#define PCIE20_PARF_PHY_CTRL 0x40
#define PHY_CTRL_PHY_TX0_TERM_OFFSET_MASK GENMASK(20, 16)
#define PHY_CTRL_PHY_TX0_TERM_OFFSET(x) ((x) << 16)
@@ -58,6 +66,13 @@
#define PCIE20_PARF_BDF_TRANSLATE_CFG 0x24C
#define PCIE20_PARF_DEVICE_TYPE 0x1000

+#define AHB_CLK_EN BIT(0)
+#define MSTR_AXI_CLK_EN BIT(1)
+#define BYPASS BIT(4)
+
+#define PCIE20_PARF_BDF_TO_SID_TABLE 0x2000
+#define BDF_TO_SID_TABLE_SIZE 0x100
+
#define PCIE20_ELBI_SYS_CTRL 0x04
#define PCIE20_ELBI_SYS_CTRL_LT_ENABLE BIT(0)

@@ -68,11 +83,13 @@
#define CFG_BRIDGE_SB_INIT BIT(0)

#define PCIE20_CAP 0x70
-#define PCIE20_DEVICE_CONTROL2_STATUS2 (PCIE20_CAP + PCI_EXP_DEVCTL2)
#define PCIE20_CAP_LINK_CAPABILITIES (PCIE20_CAP + PCI_EXP_LNKCAP)
#define PCIE20_CAP_LINK_1 (PCIE20_CAP + 0x14)
#define PCIE_CAP_LINK1_VAL 0x2FD7F

+#define PCIE20_DEVICE_CONTROL2_STATUS2 (PCIE20_CAP + PCI_EXP_DEVCTL2)
+#define PCIE_CAP_CPL_TIMEOUT_DISABLE 0x10
+
#define PCIE20_PARF_Q2A_FLUSH 0x1AC

#define PCIE20_MISC_CONTROL_1_REG 0x8BC
@@ -96,9 +113,15 @@
#define SLV_ADDR_SPACE_SZ 0x10000000

#define PCIE20_LNK_CONTROL2_LINK_STATUS2 0xa0
+#define PCIE_CAP_CURR_DEEMPHASIS BIT(16)
+#define SPEED_GEN3 0x3

#define DEVICE_TYPE_RC 0x4

+#define PCIE30_GEN3_RELATED_OFF 0x890
+#define RXEQ_RGRDLESS_RXTS BIT(13)
+#define GEN3_ZRXDC_NONCOMPL BIT(0)
+
#define QCOM_PCIE_2_1_0_MAX_SUPPLY 3
#define QCOM_PCIE_2_1_0_MAX_CLOCKS 5
struct qcom_pcie_resources_2_1_0 {
@@ -165,6 +188,11 @@ struct qcom_pcie_resources_2_7_0 {
struct clk *pipe_clk;
};

+struct qcom_pcie_resources_2_9_0 {
+ struct clk_bulk_data clks[7];
+ struct reset_control *rst[8];
+};
+
union qcom_pcie_resources {
struct qcom_pcie_resources_1_0_0 v1_0_0;
struct qcom_pcie_resources_2_1_0 v2_1_0;
@@ -172,6 +200,7 @@ union qcom_pcie_resources {
struct qcom_pcie_resources_2_3_3 v2_3_3;
struct qcom_pcie_resources_2_4_0 v2_4_0;
struct qcom_pcie_resources_2_7_0 v2_7_0;
+ struct qcom_pcie_resources_2_9_0 v2_9_0;
};

struct qcom_pcie;
@@ -1250,6 +1279,134 @@ static void qcom_pcie_post_deinit_2_7_0(struct qcom_pcie *pcie)
clk_disable_unprepare(res->pipe_clk);
}

+static int qcom_pcie_get_resources_2_9_0(struct qcom_pcie *pcie)
+{
+ struct qcom_pcie_resources_2_9_0 *res = &pcie->res.v2_9_0;
+ struct dw_pcie *pci = pcie->pci;
+ struct device *dev = pci->dev;
+ int ret, i;
+ const char *rst_names[] = { "pipe", "sleep", "sticky", "axi_m",
+ "axi_s", "ahb", "axi_m_sticky",
+ "axi_s_sticky" };
+
+ res->clks[0].id = "iface";
+ res->clks[1].id = "axi_m";
+ res->clks[2].id = "axi_s";
+ res->clks[3].id = "ahb";
+ res->clks[4].id = "aux";
+ res->clks[5].id = "axi_bridge";
+ res->clks[6].id = "rchng";
+
+ ret = devm_clk_bulk_get(dev, ARRAY_SIZE(res->clks), res->clks);
+ if (ret < 0)
+ return ret;
+
+ 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 int qcom_pcie_init_2_9_0(struct qcom_pcie *pcie)
+{
+ struct qcom_pcie_resources_2_9_0 *res = &pcie->res.v2_9_0;
+ struct dw_pcie *pci = pcie->pci;
+ struct device *dev = pci->dev;
+ int i, ret;
+ u32 val;
+ u32 bus_master_en = PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER;
+
+ 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_bulk_prepare_enable(ARRAY_SIZE(res->clks), res->clks);
+ if (ret)
+ return ret;
+
+ /* Parf config */
+ 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(DEVICE_TYPE_RC, pcie->parf + PCIE20_PARF_DEVICE_TYPE);
+ writel(BYPASS | MSTR_AXI_CLK_EN | AHB_CLK_EN,
+ pcie->parf + PCIE20_PARF_MHI_CLOCK_RESET_CTRL);
+
+ writel(RXEQ_RGRDLESS_RXTS | GEN3_ZRXDC_NONCOMPL,
+ pci->dbi_base + PCIE30_GEN3_RELATED_OFF);
+ 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);
+
+ /* DBI config */
+ writel(bus_master_en, pci->dbi_base + PCI_COMMAND);
+
+ 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);
+
+ /* Configure PCIe link capabilities for ASPM */
+ val = readl(pci->dbi_base + PCIE20_CAP_LINK_CAPABILITIES);
+ val &= ~PCI_EXP_LNKCAP_ASPMS;
+ writel(val, pci->dbi_base + PCIE20_CAP_LINK_CAPABILITIES);
+
+ writel(PCIE_CAP_CPL_TIMEOUT_DISABLE, pci->dbi_base +
+ PCIE20_DEVICE_CONTROL2_STATUS2);
+
+ writel(PCIE_CAP_CURR_DEEMPHASIS | SPEED_GEN3,
+ pci->dbi_base + PCIE20_LNK_CONTROL2_LINK_STATUS2);
+
+ for (i = 0 ; i < BDF_TO_SID_TABLE_SIZE ; i++)
+ writel(0x0, pcie->parf + PCIE20_PARF_BDF_TO_SID_TABLE + (4 * i));
+
+ writel(0x4, pci->atu_base + PCIE_ATU_CR1_OUTBOUND_6_GEN3);
+ writel(0x90000000, pci->atu_base + PCIE_ATU_CR2_OUTBOUND_6_GEN3);
+ writel(0x00107FFFF, pci->atu_base + PCIE_ATU_LIMIT_OUTBOUND_6_GEN3);
+ writel(0x5, pci->atu_base + PCIE_ATU_CR1_OUTBOUND_7_GEN3);
+ writel(0x90000000, pci->atu_base + PCIE_ATU_CR2_OUTBOUND_7_GEN3);
+ writel(0x200000, pci->atu_base + PCIE_ATU_LOWER_BASE_OUTBOUND_7_GEN3);
+ writel(0x7FFFFF, pci->atu_base + PCIE_ATU_LIMIT_OUTBOUND_7_GEN3);
+
+ return 0;
+}
+
+static void qcom_pcie_deinit_2_9_0(struct qcom_pcie *pcie)
+{
+ struct qcom_pcie_resources_2_9_0 *res = &pcie->res.v2_9_0;
+
+ clk_bulk_disable_unprepare(ARRAY_SIZE(res->clks), res->clks);
+}
+
static int qcom_pcie_link_up(struct dw_pcie *pci)
{
u16 val = readw(pci->dbi_base + PCIE20_CAP + PCI_EXP_LNKSTA);
@@ -1359,6 +1516,14 @@ static const struct qcom_pcie_ops ops_2_7_0 = {
.post_deinit = qcom_pcie_post_deinit_2_7_0,
};

+/* Qcom IP rev.: 2.9.0 Synopsys IP rev.: 5.00a */
+static const struct qcom_pcie_ops ops_2_9_0 = {
+ .get_resources = qcom_pcie_get_resources_2_9_0,
+ .init = qcom_pcie_init_2_9_0,
+ .deinit = qcom_pcie_deinit_2_9_0,
+ .ltssm_enable = qcom_pcie_2_3_2_ltssm_enable,
+};
+
static const struct dw_pcie_ops dw_pcie_ops = {
.link_up = qcom_pcie_link_up,
};
@@ -1399,6 +1564,15 @@ static int qcom_pcie_probe(struct platform_device *pdev)
goto err_pm_runtime_put;
}

+ if (pcie->ops == &ops_2_9_0) {
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "atu");
+ pci->atu_base = devm_pci_remap_cfg_resource(dev, res);
+ if (IS_ERR(pci->atu_base)) {
+ ret = PTR_ERR(pci->atu_base);
+ goto err_pm_runtime_put;
+ }
+ }
+
pcie->gen = of_pci_get_max_link_speed(pdev->dev.of_node);
if (pcie->gen < 0)
pcie->gen = 2;
@@ -1476,6 +1650,7 @@ static const struct of_device_id qcom_pcie_match[] = {
{ .compatible = "qcom,pcie-ipq4019", .data = &ops_2_4_0 },
{ .compatible = "qcom,pcie-qcs404", .data = &ops_2_4_0 },
{ .compatible = "qcom,pcie-sdm845", .data = &ops_2_7_0 },
+ { .compatible = "qcom,pcie-ipq8074-gen3", .data = &ops_2_9_0 },
{ }
};

--
2.7.4
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