[PATCH v7 6/7] PCI: rcar-gen4: Add support for r8a779g0

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This driver previously supported r8a779f0 (R-Car S4-8). Add support
for r8a779g0 (R-Car V4H). PCIe features of both r8a779f0 and r8a779g0
are almost all the same. For example:
 - PCI Express Base Specification Revision 4.0
 - Root complex mode and endpoint mode are supported

However, r8a779g0 requires specific firmware downloading, to
initialize the PHY. Otherwise, the PCIe controller cannot work.
The firmware is attached in the manual of the r8a779g0 as text.
So, convert it to a binary file by using a script.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
---
 drivers/pci/controller/dwc/pcie-rcar-gen4.c | 201 +++++++++++++++++++-
 1 file changed, 200 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/controller/dwc/pcie-rcar-gen4.c b/drivers/pci/controller/dwc/pcie-rcar-gen4.c
index 980a916933d6..4e934e9156f2 100644
--- a/drivers/pci/controller/dwc/pcie-rcar-gen4.c
+++ b/drivers/pci/controller/dwc/pcie-rcar-gen4.c
@@ -5,8 +5,10 @@
  */
 
 #include <linux/delay.h>
+#include <linux/firmware.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
+#include <linux/iopoll.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/pci.h>
@@ -20,9 +22,10 @@
 /* Renesas-specific */
 /* PCIe Mode Setting Register 0 */
 #define PCIEMSR0		0x0000
-#define BIFUR_MOD_SET_ON	BIT(0)
+#define APP_SRIS_MODE		BIT(6)
 #define DEVICE_TYPE_EP		0
 #define DEVICE_TYPE_RC		BIT(4)
+#define BIFUR_MOD_SET_ON	BIT(0)
 
 /* PCIe Interrupt Status 0 */
 #define PCIEINTSTS0		0x0084
@@ -37,19 +40,47 @@
 #define PCIEDMAINTSTSEN		0x0314
 #define PCIEDMAINTSTSEN_INIT	GENMASK(15, 0)
 
+/* Port Logic Registers 89 */
+#define PRTLGC89		0x0b70
+
+/* Port Logic Registers 90 */
+#define PRTLGC90		0x0b74
+
 /* PCIe Reset Control Register 1 */
 #define PCIERSTCTRL1		0x0014
 #define APP_HOLD_PHY_RST	BIT(16)
 #define APP_LTSSM_ENABLE	BIT(0)
 
+/* PCIe Power Management Control */
+#define PCIEPWRMNGCTRL		0x0070
+#define APP_CLK_REQ_N		BIT(11)
+#define APP_CLK_PM_EN		BIT(10)
+
+/*
+ * The R-Car Gen4 documents don't describe the PHY registers' name.
+ * But, the initialization procedure describes these offsets. So,
+ * this driver makes up own #defines for the offsets.
+ */
+#define RCAR_GEN4_PCIE_PHY_0f8	0x0f8
+#define RCAR_GEN4_PCIE_PHY_148	0x148
+#define RCAR_GEN4_PCIE_PHY_1d4	0x1d4
+#define RCAR_GEN4_PCIE_PHY_514	0x514
+#define RCAR_GEN4_PCIE_PHY_700	0x700
+
 #define RCAR_NUM_SPEED_CHANGE_RETRIES	10
 #define RCAR_MAX_LINK_SPEED		4
 
 #define RCAR_GEN4_PCIE_EP_FUNC_DBI_OFFSET	0x1000
 #define RCAR_GEN4_PCIE_EP_FUNC_DBI2_OFFSET	0x800
 
+#define RCAR_GEN4_PCIE_FIRMWARE_NAME		"rcar_gen4_pcie.bin"
+#define RCAR_GEN4_PCIE_FIRMWARE_BASE_ADDR	0xc000
+
+MODULE_FIRMWARE(RCAR_GEN4_PCIE_FIRMWARE_NAME);
+
 struct rcar_gen4_pcie;
 struct rcar_gen4_pcie_drvdata {
+	void (*additional_common_init)(struct rcar_gen4_pcie *rcar);
 	int (*ltssm_enable)(struct rcar_gen4_pcie *rcar);
 	enum dw_pcie_device_mode mode;
 };
@@ -57,12 +88,144 @@ struct rcar_gen4_pcie_drvdata {
 struct rcar_gen4_pcie {
 	struct dw_pcie dw;
 	void __iomem *base;
+	void __iomem *phy_base;
 	struct platform_device *pdev;
 	const struct rcar_gen4_pcie_drvdata *drvdata;
 };
 #define to_rcar_gen4_pcie(_dw)	container_of(_dw, struct rcar_gen4_pcie, dw)
 
 /* Common */
+static void rcar_gen4_pcie_phy_reg_update_bits(struct rcar_gen4_pcie *rcar,
+					       u32 offset, u32 mask, u32 val)
+{
+	u32 tmp;
+
+	tmp = readl(rcar->phy_base + offset);
+	tmp &= ~mask;
+	tmp |= val;
+	writel(tmp, rcar->phy_base + offset);
+}
+
+static int rcar_gen4_pcie_reg_check(struct rcar_gen4_pcie *rcar,
+				    u32 offset, u32 mask)
+{
+	struct dw_pcie *dw = &rcar->dw;
+
+	if (dw_pcie_readl_dbi(dw, offset) & mask)
+		return -EAGAIN;
+
+	return 0;
+}
+
+static int rcar_gen4_pcie_download_phy_firmware(struct rcar_gen4_pcie *rcar)
+{
+	const u32 check_addr[] = { 0x00101018, 0x00101118, 0x00101021, 0x00101121};
+	struct dw_pcie *dw = &rcar->dw;
+	const struct firmware *fw;
+	unsigned int i, timeout;
+	u32 data;
+	int ret;
+
+	ret = request_firmware(&fw, RCAR_GEN4_PCIE_FIRMWARE_NAME, dw->dev);
+	if (ret) {
+		dev_err(dw->dev, "%s: Requesting firmware failed\n", __func__);
+		return ret;
+	}
+
+	for (i = 0; i < (fw->size / 2); i++) {
+		data = fw->data[(i * 2) + 1] << 8 | fw->data[i * 2];
+		timeout = 100;
+		do {
+			dw_pcie_writel_dbi(dw, PRTLGC89, RCAR_GEN4_PCIE_FIRMWARE_BASE_ADDR + i);
+			dw_pcie_writel_dbi(dw, PRTLGC90, data);
+			if (rcar_gen4_pcie_reg_check(rcar, PRTLGC89, BIT(30)) >= 0)
+				break;
+			if (!(--timeout)) {
+				ret = -ETIMEDOUT;
+				goto exit;
+			}
+			usleep_range(100, 200);
+		} while (1);
+	}
+
+	rcar_gen4_pcie_phy_reg_update_bits(rcar, RCAR_GEN4_PCIE_PHY_0f8, BIT(17), BIT(17));
+
+	for (i = 0; i < ARRAY_SIZE(check_addr); i++) {
+		timeout = 100;
+		do {
+			dw_pcie_writel_dbi(dw, PRTLGC89, check_addr[i]);
+			ret = rcar_gen4_pcie_reg_check(rcar, PRTLGC89, BIT(30));
+			ret |= rcar_gen4_pcie_reg_check(rcar, PRTLGC90, BIT(0));
+			if (ret >= 0)
+				break;
+			if (!(--timeout)) {
+				ret = -ETIMEDOUT;
+				goto exit;
+			}
+			usleep_range(100, 200);
+		} while (1);
+	}
+
+	ret = 0;
+exit:
+	release_firmware(fw);
+
+	return ret;
+}
+
+static int rcar_gen4_pcie_enable_phy(struct rcar_gen4_pcie *rcar)
+{
+	struct dw_pcie *dw = &rcar->dw;
+	u32 val;
+	int ret;
+
+	val = dw_pcie_readl_dbi(dw, PCIE_PORT_FORCE);
+	val |= PORT_FORCE_DO_DESKEW_FOR_SRIS;
+	dw_pcie_writel_dbi(dw, PCIE_PORT_FORCE, val);
+
+	val = readl(rcar->base + PCIEMSR0);
+	val |= APP_SRIS_MODE;
+	writel(val, rcar->base + PCIEMSR0);
+
+	rcar_gen4_pcie_phy_reg_update_bits(rcar, RCAR_GEN4_PCIE_PHY_700, BIT(28), 0);
+	rcar_gen4_pcie_phy_reg_update_bits(rcar, RCAR_GEN4_PCIE_PHY_700, BIT(20), 0);
+	rcar_gen4_pcie_phy_reg_update_bits(rcar, RCAR_GEN4_PCIE_PHY_700, BIT(12), 0);
+	rcar_gen4_pcie_phy_reg_update_bits(rcar, RCAR_GEN4_PCIE_PHY_700, BIT(4), 0);
+
+	rcar_gen4_pcie_phy_reg_update_bits(rcar, RCAR_GEN4_PCIE_PHY_148,
+					   GENMASK(23, 22), BIT(22));
+	rcar_gen4_pcie_phy_reg_update_bits(rcar, RCAR_GEN4_PCIE_PHY_148,
+					   GENMASK(18, 16), GENMASK(17, 16));
+	rcar_gen4_pcie_phy_reg_update_bits(rcar, RCAR_GEN4_PCIE_PHY_148,
+					   GENMASK(7, 6), BIT(6));
+	rcar_gen4_pcie_phy_reg_update_bits(rcar, RCAR_GEN4_PCIE_PHY_148,
+					   GENMASK(2, 0), GENMASK(11, 0));
+	rcar_gen4_pcie_phy_reg_update_bits(rcar, RCAR_GEN4_PCIE_PHY_1d4,
+					   GENMASK(16, 15), GENMASK(16, 15));
+	rcar_gen4_pcie_phy_reg_update_bits(rcar, RCAR_GEN4_PCIE_PHY_514, BIT(26), BIT(26));
+	rcar_gen4_pcie_phy_reg_update_bits(rcar, RCAR_GEN4_PCIE_PHY_0f8, BIT(16), 0);
+	rcar_gen4_pcie_phy_reg_update_bits(rcar, RCAR_GEN4_PCIE_PHY_0f8, BIT(19), BIT(19));
+
+	val = readl(rcar->base + PCIERSTCTRL1);
+	val &= ~APP_HOLD_PHY_RST;
+	writel(val, rcar->base + PCIERSTCTRL1);
+
+	ret = readl_poll_timeout(rcar->phy_base + RCAR_GEN4_PCIE_PHY_0f8, val,
+				 !(val & BIT(18)), 100, 10000);
+	if (ret < 0)
+		return ret;
+
+	ret = rcar_gen4_pcie_download_phy_firmware(rcar);
+	if (ret)
+		return ret;
+
+	val = readl(rcar->base + PCIERSTCTRL1);
+	val |= APP_LTSSM_ENABLE;
+	writel(val, rcar->base + PCIERSTCTRL1);
+
+	return 0;
+}
+
 static void rcar_gen4_pcie_ltssm_control(struct rcar_gen4_pcie *rcar,
 					 bool enable)
 {
@@ -200,6 +363,9 @@ static int rcar_gen4_pcie_common_init(struct rcar_gen4_pcie *rcar)
 	if (ret)
 		goto err_unprepare;
 
+	if (rcar->drvdata->additional_common_init)
+		rcar->drvdata->additional_common_init(rcar);
+
 	return 0;
 
 err_unprepare:
@@ -241,6 +407,10 @@ static void rcar_gen4_pcie_unprepare(struct rcar_gen4_pcie *rcar)
 
 static int rcar_gen4_pcie_get_resources(struct rcar_gen4_pcie *rcar)
 {
+	rcar->phy_base = devm_platform_ioremap_resource_byname(rcar->pdev, "phy");
+	if (IS_ERR(rcar->phy_base))
+		return PTR_ERR(rcar->phy_base);
+
 	/* Renesas-specific registers */
 	rcar->base = devm_platform_ioremap_resource_byname(rcar->pdev, "app");
 
@@ -517,6 +687,31 @@ static int r8a779f0_pcie_ltssm_enable(struct rcar_gen4_pcie *rcar)
 	return 0;
 }
 
+static void rcar_gen4_pcie_additional_common_init(struct rcar_gen4_pcie *rcar)
+{
+	struct dw_pcie *dw = &rcar->dw;
+	u32 val;
+
+	/*
+	 * The SoC manual said the register setting is required. Otherwise,
+	 * linkup failed.
+	 */
+	val = dw_pcie_readl_dbi(dw, PCIE_PORT_LANE_SKEW);
+	val &= ~PORT_LANE_SKEW_INSERT_MASK;
+	if (dw->num_lanes < 4)
+		val |= BIT(6);
+	dw_pcie_writel_dbi(dw, PCIE_PORT_LANE_SKEW, val);
+
+	val = readl(rcar->base + PCIEPWRMNGCTRL);
+	val |= APP_CLK_REQ_N | APP_CLK_PM_EN;
+	writel(val, rcar->base + PCIEPWRMNGCTRL);
+}
+
+static int rcar_gen4_pcie_ltssm_enable(struct rcar_gen4_pcie *rcar)
+{
+	return rcar_gen4_pcie_enable_phy(rcar);
+}
+
 static struct rcar_gen4_pcie_drvdata drvdata_r8a779f0_pcie = {
 	.ltssm_enable = r8a779f0_pcie_ltssm_enable,
 	.mode = DW_PCIE_RC_TYPE,
@@ -528,10 +723,14 @@ static struct rcar_gen4_pcie_drvdata drvdata_r8a779f0_pcie_ep = {
 };
 
 static struct rcar_gen4_pcie_drvdata drvdata_rcar_gen4_pcie = {
+	.additional_common_init = rcar_gen4_pcie_additional_common_init,
+	.ltssm_enable = rcar_gen4_pcie_ltssm_enable,
 	.mode = DW_PCIE_RC_TYPE,
 };
 
 static struct rcar_gen4_pcie_drvdata drvdata_rcar_gen4_pcie_ep = {
+	.additional_common_init = rcar_gen4_pcie_additional_common_init,
+	.ltssm_enable = rcar_gen4_pcie_ltssm_enable,
 	.mode = DW_PCIE_EP_TYPE,
 };
 
-- 
2.25.1





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