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openwrt/target/linux/ipq806x/patches-4.9/0071-pcie-qcom-fixes.patch
Felix Fietkau 7ffaf71d53 ipq806x: fix pcie with linux 4.9 
Signed-off-by: Felix Fietkau <nbd@nbd.name>
2017-03-13 21:10:31 +01:00

309 lines
9.5 KiB
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--- 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,
};
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