openwrt/target/linux/ipq806x/patches-4.14/0071-5-PCI-qcom-Programming-the-PCIE-iATU-for-IPQ806x.patch

From d27c303e828d7e42f339a459d2abfe30c51698e9 Mon Sep 17 00:00:00 2001
From: Sham Muthayyan <smuthayy@codeaurora.org>
Date: Tue, 26 Jul 2016 12:28:31 +0530
Subject: PCI: qcom: Programming the PCIE iATU for IPQ806x

Resolved PCIE EP detection errors caused due to missing iATU programming.

Change-Id: Ie95c0f8cb940abc0192a8a3c4e825ddba54b72fe
Signed-off-by: Sham Muthayyan <smuthayy@codeaurora.org>
---
 drivers/pci/host/pcie-qcom.c | 77 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 77 insertions(+)

--- a/drivers/pci/dwc/pcie-qcom.c
+++ b/drivers/pci/dwc/pcie-qcom.c
@@ -83,6 +83,30 @@
 #define PCIE20_CAP_LINK_1			(PCIE20_CAP + 0x14)
 #define PCIE_CAP_LINK1_VAL			0x2FD7F

+#define PCIE20_CAP_LINKCTRLSTATUS		(PCIE20_CAP + 0x10)
+
+#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
+
 #define PCIE20_PARF_Q2A_FLUSH			0x1AC

 #define PCIE20_MISC_CONTROL_1_REG		0x8BC
@@ -251,6 +275,57 @@
	writel(val, pcie->elbi + PCIE20_ELBI_SYS_CTRL);
 }

+static void qcom_pcie_prog_viewport_cfg0(struct qcom_pcie *pcie, u32 busdev)
+{
+	struct pcie_port *pp = &pcie->pci->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->pci->dbi_base + PCIE20_PLR_IATU_VIEWPORT);
+
+	writel(PCIE20_PLR_IATU_TYPE_CFG0, pcie->pci->dbi_base + PCIE20_PLR_IATU_CTRL1);
+	writel(PCIE20_PLR_IATU_ENABLE, pcie->pci->dbi_base + PCIE20_PLR_IATU_CTRL2);
+	writel(pp->cfg0_base, pcie->pci->dbi_base + PCIE20_PLR_IATU_LBAR);
+	writel((pp->cfg0_base >> 32), pcie->pci->dbi_base + PCIE20_PLR_IATU_UBAR);
+	writel((pp->cfg0_base + pp->cfg0_size - 1),
+	       pcie->pci->dbi_base + PCIE20_PLR_IATU_LAR);
+	writel(busdev, pcie->pci->dbi_base + PCIE20_PLR_IATU_LTAR);
+	writel(0, pcie->pci->dbi_base + PCIE20_PLR_IATU_UTAR);
+}
+
+static void qcom_pcie_prog_viewport_mem2_outbound(struct qcom_pcie *pcie)
+{
+	struct pcie_port *pp = &pcie->pci->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->pci->dbi_base + PCIE20_PLR_IATU_VIEWPORT);
+
+	writel(PCIE20_PLR_IATU_TYPE_MEM, pcie->pci->dbi_base + PCIE20_PLR_IATU_CTRL1);
+	writel(PCIE20_PLR_IATU_ENABLE, pcie->pci->dbi_base + PCIE20_PLR_IATU_CTRL2);
+	writel(pp->mem_base, pcie->pci->dbi_base + PCIE20_PLR_IATU_LBAR);
+	writel((pp->mem_base >> 32), pcie->pci->dbi_base + PCIE20_PLR_IATU_UBAR);
+	writel(pp->mem_base + pp->mem_size - 1,
+	       pcie->pci->dbi_base + PCIE20_PLR_IATU_LAR);
+	writel(pp->mem_bus_addr, pcie->pci->dbi_base + PCIE20_PLR_IATU_LTAR);
+	writel(upper_32_bits(pp->mem_bus_addr),
+	       pcie->pci->dbi_base + PCIE20_PLR_IATU_UTAR);
+
+	/* 256B PCIE buffer setting */
+	writel(0x1, pcie->pci->dbi_base + PCIE20_AXI_MSTR_RESP_COMP_CTRL0);
+	writel(0x1, pcie->pci->dbi_base + PCIE20_AXI_MSTR_RESP_COMP_CTRL1);
+}
+
 static int qcom_pcie_get_resources_2_1_0(struct qcom_pcie *pcie)
 {
	struct qcom_pcie_resources_2_1_0 *res = &pcie->res.v2_1_0;
@@ -465,6 +538,9 @@
	writel(CFG_BRIDGE_SB_INIT,
	       pci->dbi_base + PCIE20_AXI_MSTR_RESP_COMP_CTRL1);

+	qcom_pcie_prog_viewport_cfg0(pcie, MSM_PCIE_DEV_CFG_ADDR);
+	qcom_pcie_prog_viewport_mem2_outbound(pcie);
+
	return 0;

 err_deassert_ahb: