path: root/target/linux/ipq806x/patches-4.9/0071-pcie-qcom-fixes.patch

--- a/drivers/pci/host/pcie-qcom.c
+++ b/drivers/pci/host/pcie-qcom.c
@@ -36,8 +36,50 @@
 
 #include "pcie-designware.h"
 
+/* DBI registers */
+#define PCIE20_AXI_MSTR_RESP_COMP_CTRL0		0x818
+#define PCIE20_AXI_MSTR_RESP_COMP_CTRL1		0x81c
+
+#define PCIE20_PLR_IATU_VIEWPORT		0x900
+#define PCIE20_PLR_IATU_REGION_OUTBOUND		(0x0 << 31)
+#define PCIE20_PLR_IATU_REGION_INDEX(x)		(x << 0)
+
+#define PCIE20_PLR_IATU_CTRL1			0x904
+#define PCIE20_PLR_IATU_TYPE_CFG0		(0x4 << 0)
+#define PCIE20_PLR_IATU_TYPE_MEM		(0x0 << 0)
+
+#define PCIE20_PLR_IATU_CTRL2			0x908
+#define PCIE20_PLR_IATU_ENABLE			BIT(31)
+
+#define PCIE20_PLR_IATU_LBAR			0x90C
+#define PCIE20_PLR_IATU_UBAR			0x910
+#define PCIE20_PLR_IATU_LAR			0x914
+#define PCIE20_PLR_IATU_LTAR			0x918
+#define PCIE20_PLR_IATU_UTAR			0x91c
+
+#define MSM_PCIE_DEV_CFG_ADDR			0x01000000
+
+/* PARF registers */
+#define PCIE20_PARF_PCS_DEEMPH			0x34
+#define PCS_DEEMPH_TX_DEEMPH_GEN1(x)		(x << 16)
+#define PCS_DEEMPH_TX_DEEMPH_GEN2_3_5DB(x)	(x << 8)
+#define PCS_DEEMPH_TX_DEEMPH_GEN2_6DB(x)	(x << 0)
+
+#define PCIE20_PARF_PCS_SWING			0x38
+#define PCS_SWING_TX_SWING_FULL(x)		(x << 8)
+#define PCS_SWING_TX_SWING_LOW(x)		(x << 0)
+
 #define PCIE20_PARF_PHY_CTRL			0x40
+#define PHY_CTRL_PHY_TX0_TERM_OFFSET_MASK	(0x1f << 16)
+#define PHY_CTRL_PHY_TX0_TERM_OFFSET(x)		(x << 16)
+
 #define PCIE20_PARF_PHY_REFCLK			0x4C
+#define REF_SSP_EN				BIT(16)
+#define REF_USE_PAD				BIT(12)
+
+#define PCIE20_PARF_CONFIG_BITS			0x50
+#define PHY_RX0_EQ(x)				(x << 24)
+
 #define PCIE20_PARF_DBI_BASE_ADDR		0x168
 #define PCIE20_PARF_SLV_ADDR_SPACE_SIZE		0x16c
 #define PCIE20_PARF_AXI_MSTR_WR_ADDR_HALT	0x178
@@ -53,14 +95,18 @@ struct qcom_pcie_resources_v0 {
 	struct clk *iface_clk;
 	struct clk *core_clk;
 	struct clk *phy_clk;
+	struct clk *aux_clk;
+	struct clk *ref_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 reset_control *ext_reset;
 	struct regulator *vdda;
 	struct regulator *vdda_phy;
 	struct regulator *vdda_refclk;
+	uint8_t phy_tx0_term_offset;
 };
 
 struct qcom_pcie_resources_v1 {
@@ -82,6 +128,7 @@ struct qcom_pcie;
 struct qcom_pcie_ops {
 	int (*get_resources)(struct qcom_pcie *pcie);
 	int (*init)(struct qcom_pcie *pcie);
+	void (*configure)(struct qcom_pcie *pcie);
 	void (*deinit)(struct qcom_pcie *pcie);
 };
 
@@ -160,6 +207,14 @@ static int qcom_pcie_get_resources_v0(st
 	if (IS_ERR(res->phy_clk))
 		return PTR_ERR(res->phy_clk);
 
+	res->aux_clk = devm_clk_get(dev, "aux");
+	if (IS_ERR(res->aux_clk))
+		return PTR_ERR(res->aux_clk);
+
+	res->ref_clk = devm_clk_get(dev, "ref");
+	if (IS_ERR(res->ref_clk))
+		return PTR_ERR(res->ref_clk);
+
 	res->pci_reset = devm_reset_control_get(dev, "pci");
 	if (IS_ERR(res->pci_reset))
 		return PTR_ERR(res->pci_reset);
@@ -180,6 +235,14 @@ static int qcom_pcie_get_resources_v0(st
 	if (IS_ERR(res->phy_reset))
 		return PTR_ERR(res->phy_reset);
 
+	res->ext_reset = devm_reset_control_get(dev, "ext");
+	if (IS_ERR(res->ext_reset))
+		return PTR_ERR(res->ext_reset);
+
+	if (of_property_read_u8(dev->of_node, "phy-tx0-term-offset",
+				&res->phy_tx0_term_offset))
+		res->phy_tx0_term_offset = 0;
+
 	return 0;
 }
 
@@ -223,15 +286,69 @@ static void qcom_pcie_deinit_v0(struct q
 	reset_control_assert(res->axi_reset);
 	reset_control_assert(res->ahb_reset);
 	reset_control_assert(res->por_reset);
-	reset_control_assert(res->pci_reset);
+	reset_control_assert(res->phy_reset);
+	reset_control_assert(res->ext_reset);
 	clk_disable_unprepare(res->iface_clk);
 	clk_disable_unprepare(res->core_clk);
 	clk_disable_unprepare(res->phy_clk);
+	clk_disable_unprepare(res->aux_clk);
+	clk_disable_unprepare(res->ref_clk);
 	regulator_disable(res->vdda);
 	regulator_disable(res->vdda_phy);
 	regulator_disable(res->vdda_refclk);
 }
 
+static void qcom_pcie_prog_viewport_cfg0(struct qcom_pcie *pcie, u32 busdev)
+{
+	struct pcie_port *pp = &pcie->pp;
+
+	/*
+	 * program and enable address translation region 0 (device config
+	 * address space); region type config;
+	 * axi config address range to device config address range
+	 */
+	writel(PCIE20_PLR_IATU_REGION_OUTBOUND |
+	       PCIE20_PLR_IATU_REGION_INDEX(0),
+	       pcie->pp.dbi_base + PCIE20_PLR_IATU_VIEWPORT);
+
+	writel(PCIE20_PLR_IATU_TYPE_CFG0, pcie->pp.dbi_base + PCIE20_PLR_IATU_CTRL1);
+	writel(PCIE20_PLR_IATU_ENABLE, pcie->pp.dbi_base + PCIE20_PLR_IATU_CTRL2);
+	writel(pp->cfg0_base, pcie->pp.dbi_base + PCIE20_PLR_IATU_LBAR);
+	writel((pp->cfg0_base >> 32), pcie->pp.dbi_base + PCIE20_PLR_IATU_UBAR);
+	writel((pp->cfg0_base + pp->cfg0_size - 1),
+	       pcie->pp.dbi_base + PCIE20_PLR_IATU_LAR);
+	writel(busdev, pcie->pp.dbi_base + PCIE20_PLR_IATU_LTAR);
+	writel(0, pcie->pp.dbi_base + PCIE20_PLR_IATU_UTAR);
+}
+
+static void qcom_pcie_prog_viewport_mem2_outbound(struct qcom_pcie *pcie)
+{
+	struct pcie_port *pp = &pcie->pp;
+
+	/*
+	 * program and enable address translation region 2 (device resource
+	 * address space); region type memory;
+	 * axi device bar address range to device bar address range
+	 */
+	writel(PCIE20_PLR_IATU_REGION_OUTBOUND |
+	       PCIE20_PLR_IATU_REGION_INDEX(2),
+	       pcie->pp.dbi_base + PCIE20_PLR_IATU_VIEWPORT);
+
+	writel(PCIE20_PLR_IATU_TYPE_MEM, pcie->pp.dbi_base + PCIE20_PLR_IATU_CTRL1);
+	writel(PCIE20_PLR_IATU_ENABLE, pcie->pp.dbi_base + PCIE20_PLR_IATU_CTRL2);
+	writel(pp->mem_base, pcie->pp.dbi_base + PCIE20_PLR_IATU_LBAR);
+	writel((pp->mem_base >> 32), pcie->pp.dbi_base + PCIE20_PLR_IATU_UBAR);
+	writel(pp->mem_base + pp->mem_size - 1,
+	       pcie->pp.dbi_base + PCIE20_PLR_IATU_LAR);
+	writel(pp->mem_bus_addr, pcie->pp.dbi_base + PCIE20_PLR_IATU_LTAR);
+	writel(upper_32_bits(pp->mem_bus_addr),
+	       pcie->pp.dbi_base + PCIE20_PLR_IATU_UTAR);
+
+	/* 256B PCIE buffer setting */
+	writel(0x1, pcie->pp.dbi_base + PCIE20_AXI_MSTR_RESP_COMP_CTRL0);
+	writel(0x1, pcie->pp.dbi_base + PCIE20_AXI_MSTR_RESP_COMP_CTRL1);
+}
+
 static int qcom_pcie_init_v0(struct qcom_pcie *pcie)
 {
 	struct qcom_pcie_resources_v0 *res = &pcie->res.v0;
@@ -260,13 +377,19 @@ static int qcom_pcie_init_v0(struct qcom
 	ret = reset_control_assert(res->ahb_reset);
 	if (ret) {
 		dev_err(dev, "cannot assert ahb reset\n");
-		goto err_assert_ahb;
+		goto err_assert_reset;
+	}
+
+	ret = reset_control_deassert(res->ext_reset);
+	if (ret) {
+		dev_err(dev, "cannot deassert ext reset\n");
+		goto err_assert_reset;
 	}
 
 	ret = clk_prepare_enable(res->iface_clk);
 	if (ret) {
 		dev_err(dev, "cannot prepare/enable iface clock\n");
-		goto err_assert_ahb;
+		goto err_assert_reset;
 	}
 
 	ret = clk_prepare_enable(res->phy_clk);
@@ -281,22 +404,53 @@ static int qcom_pcie_init_v0(struct qcom
 		goto err_clk_core;
 	}
 
+	ret = clk_prepare_enable(res->aux_clk);
+	if (ret) {
+		dev_err(dev, "cannot prepare/enable aux clock\n");
+		goto err_clk_aux;
+	}
+
+	ret = clk_prepare_enable(res->ref_clk);
+	if (ret) {
+		dev_err(dev, "cannot prepare/enable ref clock\n");
+		goto err_clk_ref;
+	}
+
 	ret = reset_control_deassert(res->ahb_reset);
 	if (ret) {
 		dev_err(dev, "cannot deassert ahb reset\n");
 		goto err_deassert_ahb;
 	}
+	udelay(1);
 
 	/* 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 */
+	/* Set Tx termination offset */
+	val = readl(pcie->parf + PCIE20_PARF_PHY_CTRL);
+	val &= ~PHY_CTRL_PHY_TX0_TERM_OFFSET_MASK;
+	val |= PHY_CTRL_PHY_TX0_TERM_OFFSET(res->phy_tx0_term_offset);
+	writel(val, pcie->parf + PCIE20_PARF_PHY_CTRL);
+
+	/* PARF programming */
+	writel(PCS_DEEMPH_TX_DEEMPH_GEN1(0x18) |
+	       PCS_DEEMPH_TX_DEEMPH_GEN2_3_5DB(0x18) |
+	       PCS_DEEMPH_TX_DEEMPH_GEN2_6DB(0x22),
+	       pcie->parf + PCIE20_PARF_PCS_DEEMPH);
+	writel(PCS_SWING_TX_SWING_FULL(0x78) |
+	       PCS_SWING_TX_SWING_LOW(0x78),
+	       pcie->parf + PCIE20_PARF_PCS_SWING);
+	writel(PHY_RX0_EQ(0x4), pcie->parf + PCIE20_PARF_CONFIG_BITS);
+
+	/* Enable reference clock */
 	val = readl(pcie->parf + PCIE20_PARF_PHY_REFCLK);
-	val |= BIT(16);
+	val &= ~REF_USE_PAD;
+	val |= REF_SSP_EN;
 	writel(val, pcie->parf + PCIE20_PARF_PHY_REFCLK);
 
+	/* De-assert PHY, PCIe, POR and AXI resets */
 	ret = reset_control_deassert(res->phy_reset);
 	if (ret) {
 		dev_err(dev, "cannot deassert phy reset\n");
@@ -327,12 +481,16 @@ static int qcom_pcie_init_v0(struct qcom
 	return 0;
 
 err_deassert_ahb:
+	clk_disable_unprepare(res->ref_clk);
+err_clk_ref:
+	clk_disable_unprepare(res->aux_clk);
+err_clk_aux:
 	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:
+err_assert_reset:
 	regulator_disable(res->vdda_phy);
 err_vdda_phy:
 	regulator_disable(res->vdda_refclk);
@@ -342,6 +500,12 @@ err_refclk:
 	return ret;
 }
 
+static void qcom_pcie_configure_v0(struct qcom_pcie *pcie)
+{
+	qcom_pcie_prog_viewport_cfg0(pcie, MSM_PCIE_DEV_CFG_ADDR);
+	qcom_pcie_prog_viewport_mem2_outbound(pcie);
+}
+
 static void qcom_pcie_deinit_v1(struct qcom_pcie *pcie)
 {
 	struct qcom_pcie_resources_v1 *res = &pcie->res.v1;
@@ -455,6 +619,9 @@ static void qcom_pcie_host_init(struct p
 	if (ret)
 		goto err;
 
+	if (pcie->ops->init)
+		pcie->ops->init(pcie);
+
 	return;
 err:
 	qcom_ep_reset_assert(pcie);
@@ -486,6 +653,7 @@ static struct pcie_host_ops qcom_pcie_dw
 static const struct qcom_pcie_ops ops_v0 = {
 	.get_resources = qcom_pcie_get_resources_v0,
 	.init = qcom_pcie_init_v0,
+	.configure = qcom_pcie_configure_v0,
 	.deinit = qcom_pcie_deinit_v0,
 };