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311 lines
9.2 KiB
311 lines
9.2 KiB
--- a/drivers/pci/host/pcie-qcom.c
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+++ b/drivers/pci/host/pcie-qcom.c
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@@ -29,8 +29,53 @@
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#include "pcie-designware.h"
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+/* DBI registers */
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+#define PCIE20_CAP 0x70
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+#define PCIE20_CAP_LINKCTRLSTATUS (PCIE20_CAP + 0x10)
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+
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+#define PCIE20_AXI_MSTR_RESP_COMP_CTRL0 0x818
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+#define PCIE20_AXI_MSTR_RESP_COMP_CTRL1 0x81c
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+
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+#define PCIE20_PLR_IATU_VIEWPORT 0x900
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+#define PCIE20_PLR_IATU_REGION_OUTBOUND (0x0 << 31)
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+#define PCIE20_PLR_IATU_REGION_INDEX(x) (x << 0)
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+
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+#define PCIE20_PLR_IATU_CTRL1 0x904
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+#define PCIE20_PLR_IATU_TYPE_CFG0 (0x4 << 0)
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+#define PCIE20_PLR_IATU_TYPE_MEM (0x0 << 0)
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+
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+#define PCIE20_PLR_IATU_CTRL2 0x908
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+#define PCIE20_PLR_IATU_ENABLE BIT(31)
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+
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+#define PCIE20_PLR_IATU_LBAR 0x90C
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+#define PCIE20_PLR_IATU_UBAR 0x910
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+#define PCIE20_PLR_IATU_LAR 0x914
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+#define PCIE20_PLR_IATU_LTAR 0x918
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+#define PCIE20_PLR_IATU_UTAR 0x91c
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+
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+#define MSM_PCIE_DEV_CFG_ADDR 0x01000000
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+
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+/* PARF registers */
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+#define PCIE20_PARF_PCS_DEEMPH 0x34
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+#define PCS_DEEMPH_TX_DEEMPH_GEN1(x) (x << 16)
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+#define PCS_DEEMPH_TX_DEEMPH_GEN2_3_5DB(x) (x << 8)
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+#define PCS_DEEMPH_TX_DEEMPH_GEN2_6DB(x) (x << 0)
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+
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+#define PCIE20_PARF_PCS_SWING 0x38
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+#define PCS_SWING_TX_SWING_FULL(x) (x << 8)
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+#define PCS_SWING_TX_SWING_LOW(x) (x << 0)
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+
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#define PCIE20_PARF_PHY_CTRL 0x40
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+#define PHY_CTRL_PHY_TX0_TERM_OFFSET_MASK (0x1f << 16)
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+#define PHY_CTRL_PHY_TX0_TERM_OFFSET(x) (x << 16)
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+
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#define PCIE20_PARF_PHY_REFCLK 0x4C
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+#define REF_SSP_EN BIT(16)
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+#define REF_USE_PAD BIT(12)
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+
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+#define PCIE20_PARF_CONFIG_BITS 0x50
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+#define PHY_RX0_EQ(x) (x << 24)
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+
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#define PCIE20_PARF_DBI_BASE_ADDR 0x168
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#define PCIE20_PARF_SLV_ADDR_SPACE_SIZE 0x16c
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#define PCIE20_PARF_AXI_MSTR_WR_ADDR_HALT 0x178
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@@ -39,9 +84,6 @@
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#define PCIE20_ELBI_SYS_STTS 0x08
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#define XMLH_LINK_UP BIT(10)
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-#define PCIE20_CAP 0x70
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-#define PCIE20_CAP_LINKCTRLSTATUS (PCIE20_CAP + 0x10)
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-
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#define PERST_DELAY_MIN_US 1000
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#define PERST_DELAY_MAX_US 1005
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@@ -56,14 +98,18 @@ struct qcom_pcie_resources_v0 {
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struct clk *iface_clk;
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struct clk *core_clk;
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struct clk *phy_clk;
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+ struct clk *aux_clk;
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+ struct clk *ref_clk;
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struct reset_control *pci_reset;
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struct reset_control *axi_reset;
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struct reset_control *ahb_reset;
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struct reset_control *por_reset;
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struct reset_control *phy_reset;
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+ struct reset_control *ext_reset;
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struct regulator *vdda;
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struct regulator *vdda_phy;
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struct regulator *vdda_refclk;
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+ uint8_t phy_tx0_term_offset;
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};
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struct qcom_pcie_resources_v1 {
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@@ -106,20 +152,10 @@ writel_masked(void __iomem *addr, u32 cl
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static void qcom_ep_reset_assert_deassert(struct qcom_pcie *pcie, int assert)
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{
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- int val, active_low;
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-
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if (IS_ERR_OR_NULL(pcie->reset))
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return;
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- active_low = gpiod_is_active_low(pcie->reset);
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-
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- if (assert)
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- val = !!active_low;
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- else
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- val = !active_low;
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-
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- gpiod_set_value(pcie->reset, val);
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-
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+ gpiod_set_value(pcie->reset, assert);
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usleep_range(PERST_DELAY_MIN_US, PERST_DELAY_MAX_US);
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}
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@@ -156,10 +192,13 @@ static void qcom_pcie_disable_resources_
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reset_control_assert(res->axi_reset);
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reset_control_assert(res->ahb_reset);
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reset_control_assert(res->por_reset);
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- reset_control_assert(res->pci_reset);
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+ reset_control_assert(res->phy_reset);
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+ reset_control_assert(res->ext_reset);
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clk_disable_unprepare(res->iface_clk);
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clk_disable_unprepare(res->core_clk);
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clk_disable_unprepare(res->phy_clk);
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+ clk_disable_unprepare(res->aux_clk);
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+ clk_disable_unprepare(res->ref_clk);
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regulator_disable(res->vdda);
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regulator_disable(res->vdda_phy);
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regulator_disable(res->vdda_refclk);
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@@ -201,6 +240,12 @@ static int qcom_pcie_enable_resources_v0
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goto err_vdda_phy;
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}
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+ ret = reset_control_deassert(res->ext_reset);
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+ if (ret) {
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+ dev_err(dev, "cannot assert ext reset\n");
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+ goto err_reset_ext;
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+ }
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+
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ret = clk_prepare_enable(res->iface_clk);
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if (ret) {
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dev_err(dev, "cannot prepare/enable iface clock\n");
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@@ -219,21 +264,40 @@ static int qcom_pcie_enable_resources_v0
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goto err_clk_phy;
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}
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+ ret = clk_prepare_enable(res->aux_clk);
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+ if (ret) {
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+ dev_err(dev, "cannot prepare/enable aux clock\n");
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+ goto err_clk_aux;
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+ }
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+
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+ ret = clk_prepare_enable(res->ref_clk);
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+ if (ret) {
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+ dev_err(dev, "cannot prepare/enable ref clock\n");
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+ goto err_clk_ref;
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+ }
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+
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ret = reset_control_deassert(res->ahb_reset);
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if (ret) {
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dev_err(dev, "cannot deassert ahb reset\n");
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goto err_reset_ahb;
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}
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+ udelay(1);
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return 0;
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err_reset_ahb:
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+ clk_disable_unprepare(res->ref_clk);
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+err_clk_ref:
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+ clk_disable_unprepare(res->aux_clk);
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+err_clk_aux:
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clk_disable_unprepare(res->phy_clk);
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err_clk_phy:
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clk_disable_unprepare(res->core_clk);
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err_clk_core:
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clk_disable_unprepare(res->iface_clk);
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err_iface:
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+ reset_control_assert(res->ext_reset);
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+err_reset_ext:
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regulator_disable(res->vdda_phy);
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err_vdda_phy:
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regulator_disable(res->vdda_refclk);
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@@ -329,6 +393,14 @@ static int qcom_pcie_get_resources_v0(st
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if (IS_ERR(res->phy_clk))
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return PTR_ERR(res->phy_clk);
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+ res->aux_clk = devm_clk_get(dev, "aux");
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+ if (IS_ERR(res->aux_clk))
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+ return PTR_ERR(res->aux_clk);
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+
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+ res->ref_clk = devm_clk_get(dev, "ref");
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+ if (IS_ERR(res->ref_clk))
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+ return PTR_ERR(res->ref_clk);
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+
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res->pci_reset = devm_reset_control_get(dev, "pci");
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if (IS_ERR(res->pci_reset))
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return PTR_ERR(res->pci_reset);
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@@ -349,6 +421,14 @@ static int qcom_pcie_get_resources_v0(st
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if (IS_ERR(res->phy_reset))
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return PTR_ERR(res->phy_reset);
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+ res->ext_reset = devm_reset_control_get(dev, "ext");
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+ if (IS_ERR(res->ext_reset))
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+ return PTR_ERR(res->ext_reset);
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+
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+ if (of_property_read_u8(dev->of_node, "phy-tx0-term-offset",
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+ &res->phy_tx0_term_offset))
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+ res->phy_tx0_term_offset = 0;
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+
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return 0;
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}
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@@ -461,6 +541,57 @@ err_res:
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qcom_pcie_disable_resources_v1(pcie);
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}
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+static void qcom_pcie_prog_viewport_cfg0(struct qcom_pcie *pcie, u32 busdev)
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+{
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+ struct pcie_port *pp = &pcie->pp;
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+
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+ /*
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+ * program and enable address translation region 0 (device config
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+ * address space); region type config;
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+ * axi config address range to device config address range
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+ */
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+ writel(PCIE20_PLR_IATU_REGION_OUTBOUND |
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+ PCIE20_PLR_IATU_REGION_INDEX(0),
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+ pcie->dbi + PCIE20_PLR_IATU_VIEWPORT);
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+
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+ writel(PCIE20_PLR_IATU_TYPE_CFG0, pcie->dbi + PCIE20_PLR_IATU_CTRL1);
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+ writel(PCIE20_PLR_IATU_ENABLE, pcie->dbi + PCIE20_PLR_IATU_CTRL2);
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+ writel(pp->cfg0_mod_base, pcie->dbi + PCIE20_PLR_IATU_LBAR);
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+ writel((pp->cfg0_mod_base >> 32), pcie->dbi + PCIE20_PLR_IATU_UBAR);
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+ writel((pp->cfg0_mod_base + pp->cfg0_size - 1),
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+ pcie->dbi + PCIE20_PLR_IATU_LAR);
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+ writel(busdev, pcie->dbi + PCIE20_PLR_IATU_LTAR);
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+ writel(0, pcie->dbi + PCIE20_PLR_IATU_UTAR);
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+}
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+
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+static void qcom_pcie_prog_viewport_mem2_outbound(struct qcom_pcie *pcie)
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+{
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+ struct pcie_port *pp = &pcie->pp;
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+
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+ /*
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+ * program and enable address translation region 2 (device resource
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+ * address space); region type memory;
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+ * axi device bar address range to device bar address range
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+ */
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+ writel(PCIE20_PLR_IATU_REGION_OUTBOUND |
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+ PCIE20_PLR_IATU_REGION_INDEX(2),
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+ pcie->dbi + PCIE20_PLR_IATU_VIEWPORT);
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+
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+ writel(PCIE20_PLR_IATU_TYPE_MEM, pcie->dbi + PCIE20_PLR_IATU_CTRL1);
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+ writel(PCIE20_PLR_IATU_ENABLE, pcie->dbi + PCIE20_PLR_IATU_CTRL2);
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+ writel(pp->mem_mod_base, pcie->dbi + PCIE20_PLR_IATU_LBAR);
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+ writel((pp->mem_mod_base >> 32), pcie->dbi + PCIE20_PLR_IATU_UBAR);
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+ writel(pp->mem_mod_base + pp->mem_size - 1,
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+ pcie->dbi + PCIE20_PLR_IATU_LAR);
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+ writel(pp->mem_bus_addr, pcie->dbi + PCIE20_PLR_IATU_LTAR);
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+ writel(upper_32_bits(pp->mem_bus_addr),
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+ pcie->dbi + PCIE20_PLR_IATU_UTAR);
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+
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+ /* 256B PCIE buffer setting */
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+ writel(0x1, pcie->dbi + PCIE20_AXI_MSTR_RESP_COMP_CTRL0);
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+ writel(0x1, pcie->dbi + PCIE20_AXI_MSTR_RESP_COMP_CTRL1);
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+}
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+
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static void qcom_pcie_host_init_v0(struct pcie_port *pp)
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{
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struct qcom_pcie *pcie = to_qcom_pcie(pp);
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@@ -470,15 +601,34 @@ static void qcom_pcie_host_init_v0(struc
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qcom_ep_reset_assert(pcie);
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+ reset_control_assert(res->ahb_reset);
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+
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ret = qcom_pcie_enable_resources_v0(pcie);
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if (ret)
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return;
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writel_masked(pcie->parf + PCIE20_PARF_PHY_CTRL, BIT(0), 0);
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- /* enable external reference clock */
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- writel_masked(pcie->parf + PCIE20_PARF_PHY_REFCLK, 0, BIT(16));
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+ /* Set Tx termination offset */
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+ writel_masked(pcie->parf + PCIE20_PARF_PHY_CTRL,
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+ PHY_CTRL_PHY_TX0_TERM_OFFSET_MASK,
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+ PHY_CTRL_PHY_TX0_TERM_OFFSET(res->phy_tx0_term_offset));
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+
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+ /* PARF programming */
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+ writel(PCS_DEEMPH_TX_DEEMPH_GEN1(0x18) |
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+ PCS_DEEMPH_TX_DEEMPH_GEN2_3_5DB(0x18) |
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+ PCS_DEEMPH_TX_DEEMPH_GEN2_6DB(0x22),
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+ pcie->parf + PCIE20_PARF_PCS_DEEMPH);
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+ writel(PCS_SWING_TX_SWING_FULL(0x78) |
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+ PCS_SWING_TX_SWING_LOW(0x78),
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+ pcie->parf + PCIE20_PARF_PCS_SWING);
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+ writel(PHY_RX0_EQ(0x4), pcie->parf + PCIE20_PARF_CONFIG_BITS);
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+
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+ /* Enable reference clock */
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+ writel_masked(pcie->parf + PCIE20_PARF_PHY_REFCLK,
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+ REF_USE_PAD, REF_SSP_EN);
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+ /* De-assert PHY, PCIe, POR and AXI resets */
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ret = reset_control_deassert(res->phy_reset);
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if (ret) {
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dev_err(dev, "cannot deassert phy reset\n");
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@@ -517,6 +667,9 @@ static void qcom_pcie_host_init_v0(struc
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if (ret)
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goto err;
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+ qcom_pcie_prog_viewport_cfg0(pcie, MSM_PCIE_DEV_CFG_ADDR);
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+ qcom_pcie_prog_viewport_mem2_outbound(pcie);
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+
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return;
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err:
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qcom_ep_reset_assert(pcie);
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