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From eddd13215d0f2b549ebc5f0e8796d5b1231f90a0 Mon Sep 17 00:00:00 2001
From: Sham Muthayyan <smuthayy@codeaurora.org>
Date: Tue, 19 Jul 2016 19:58:22 +0530
Subject: PCI: qcom: Fixed IPQ806x PCIE init changes
Change-Id: Ic319b1aec27a47809284759f8fcb6a8815b7cf7e
Signed-off-by: Sham Muthayyan <smuthayy@codeaurora.org>
---
drivers/pci/host/pcie-qcom.c | 62 +++++++++++++++++++++++++++++++++++++-------
1 file changed, 53 insertions(+), 9 deletions(-)
--- a/drivers/pci/host/pcie-qcom.c
+++ b/drivers/pci/host/pcie-qcom.c
@@ -37,7 +37,13 @@
#include "pcie-designware.h"
#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_DBI_BASE_ADDR 0x168
#define PCIE20_PARF_SLV_ADDR_SPACE_SIZE 0x16c
#define PCIE20_PARF_AXI_MSTR_WR_ADDR_HALT 0x178
@@ -48,6 +54,18 @@
#define PCIE20_CAP 0x70
#define PERST_DELAY_US 1000
+/* 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_CONFIG_BITS 0x50
+#define PHY_RX0_EQ(x) (x << 24)
struct qcom_pcie_resources_v0 {
struct clk *iface_clk;
@@ -64,6 +82,7 @@ struct qcom_pcie_resources_v0 {
struct regulator *vdda;
struct regulator *vdda_phy;
struct regulator *vdda_refclk;
+ uint8_t phy_tx0_term_offset;
};
struct qcom_pcie_resources_v1 {
@@ -100,6 +119,16 @@ struct qcom_pcie {
#define to_qcom_pcie(x) container_of(x, struct qcom_pcie, pp)
+static inline void
+writel_masked(void __iomem *addr, u32 clear_mask, u32 set_mask)
+{
+ u32 val = readl(addr);
+
+ val &= ~clear_mask;
+ val |= set_mask;
+ writel(val, addr);
+}
+
static void qcom_ep_reset_assert(struct qcom_pcie *pcie)
{
gpiod_set_value(pcie->reset, 1);
@@ -195,6 +224,10 @@ static int qcom_pcie_get_resources_v0(st
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;
}
@@ -254,7 +287,6 @@ static int qcom_pcie_init_v0(struct qcom
{
struct qcom_pcie_resources_v0 *res = &pcie->res.v0;
struct device *dev = pcie->pp.dev;
- u32 val;
int ret;
ret = reset_control_assert(res->ahb_reset);
@@ -323,15 +355,27 @@ static int qcom_pcie_init_v0(struct qcom
goto err_deassert_ahb;
}
- /* 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 */
- val = readl(pcie->parf + PCIE20_PARF_PHY_REFCLK);
- val |= BIT(16);
- writel(val, pcie->parf + PCIE20_PARF_PHY_REFCLK);
+ writel_masked(pcie->parf + PCIE20_PARF_PHY_CTRL, BIT(0), 0);
+
+ /* Set Tx termination offset */
+ writel_masked(pcie->parf + PCIE20_PARF_PHY_CTRL,
+ PHY_CTRL_PHY_TX0_TERM_OFFSET_MASK,
+ PHY_CTRL_PHY_TX0_TERM_OFFSET(res->phy_tx0_term_offset));
+
+ /* 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 */
+ writel_masked(pcie->parf + PCIE20_PARF_PHY_REFCLK,
+ REF_USE_PAD, REF_SSP_EN);
+
ret = reset_control_deassert(res->phy_reset);
if (ret) {
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