[PATCH 0/6] PCI: dwc: rcar-gen4: Add R-Car V4H support

[PATCH 0/6] PCI: dwc: rcar-gen4: Add R-Car V4H support

[Yoshihiro Shimoda]

The pcie-rcar-gen4 driver can reuse other R-Car Gen4 support. However,
some initializing settings differs between R-Car S4-8 (r8a779f0) and
others. The R-Car S4-8 will be minority about the setting way. So,
R-Car V4H will be majority and this is generic initialization way
as "renesas,rcar-gen4-pcie{-ep}" compatible. For now, I tested
both R-Car S4-8 and R-Car V4H on this driver. I'll support one more
other SoC (R-Car V4M) in the future.

Yoshihiro Shimoda (6):
  dt-bindings: PCI: rcar-gen4-pci-host: Add R-Car V4H compatible
  dt-bindings: PCI: rcar-gen4-pci-ep: Add R-Car V4H compatible
  PCI: dwc: Add PCIE_PORT_{FORCE,LANE_SKEW} macros
  PCI: dwc: rcar-gen4: Add a new function pointer for other SoC support
  PCI: dwc: rcar-gen4: Add support for other R-Car Gen4 PCIe controller
  misc: pci_endpoint_test: Add Device ID for R-Car V4H PCIe controller

 .../bindings/pci/rcar-gen4-pci-ep.yaml        |   4 +-
 .../bindings/pci/rcar-gen4-pci-host.yaml      |   4 +-
 drivers/misc/pci_endpoint_test.c              |   4 +
 drivers/pci/controller/dwc/pcie-designware.h  |   6 +
 drivers/pci/controller/dwc/pcie-rcar-gen4.c   | 245 +++++++++++++++++-
 5 files changed, 255 insertions(+), 8 deletions(-)

-- 
2.25.1

[PATCH 1/6] dt-bindings: PCI: rcar-gen4-pci-host: Add R-Car V4H compatible

[Yoshihiro Shimoda]

Document bindings for R-Car V4H (R8A779G0) PCIe host module.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
---
 Documentation/devicetree/bindings/pci/rcar-gen4-pci-host.yaml | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/pci/rcar-gen4-pci-host.yaml b/Documentation/devicetree/bindings/pci/rcar-gen4-pci-host.yaml
index ffb34339b637..955c664f1fbb 100644
--- a/Documentation/devicetree/bindings/pci/rcar-gen4-pci-host.yaml
+++ b/Documentation/devicetree/bindings/pci/rcar-gen4-pci-host.yaml
@@ -16,7 +16,9 @@ allOf:
 properties:
   compatible:
     items:
-      - const: renesas,r8a779f0-pcie   # R-Car S4-8
+      - enum:
+          - renesas,r8a779f0-pcie      # R-Car S4-8
+          - renesas,r8a779g0-pcie      # R-Car V4H
       - const: renesas,rcar-gen4-pcie  # R-Car Gen4
 
   reg:
-- 
2.25.1

Re: [PATCH 1/6] dt-bindings: PCI: rcar-gen4-pci-host: Add R-Car V4H compatible

[Conor Dooley]

[-- Attachment #1: Type: text/plain, Size: 1102 bytes --]

On Thu, Feb 29, 2024 at 09:07:14PM +0900, Yoshihiro Shimoda wrote:
> Document bindings for R-Car V4H (R8A779G0) PCIe host module.
> 
> Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>

Acked-by: Conor Dooley <conor.dooley@microchip.com>

Cheers,
Conor.

> ---
>  Documentation/devicetree/bindings/pci/rcar-gen4-pci-host.yaml | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/pci/rcar-gen4-pci-host.yaml b/Documentation/devicetree/bindings/pci/rcar-gen4-pci-host.yaml
> index ffb34339b637..955c664f1fbb 100644
> --- a/Documentation/devicetree/bindings/pci/rcar-gen4-pci-host.yaml
> +++ b/Documentation/devicetree/bindings/pci/rcar-gen4-pci-host.yaml
> @@ -16,7 +16,9 @@ allOf:
>  properties:
>    compatible:
>      items:
> -      - const: renesas,r8a779f0-pcie   # R-Car S4-8
> +      - enum:
> +          - renesas,r8a779f0-pcie      # R-Car S4-8
> +          - renesas,r8a779g0-pcie      # R-Car V4H
>        - const: renesas,rcar-gen4-pcie  # R-Car Gen4
>  
>    reg:
> -- 
> 2.25.1
> 

[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 228 bytes --]

Re: [PATCH 1/6] dt-bindings: PCI: rcar-gen4-pci-host: Add R-Car V4H compatible

[Geert Uytterhoeven]

On Thu, Feb 29, 2024 at 1:08 PM Yoshihiro Shimoda
<yoshihiro.shimoda.uh@renesas.com> wrote:
> Document bindings for R-Car V4H (R8A779G0) PCIe host module.
>
> Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>

Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

[PATCH 2/6] dt-bindings: PCI: rcar-gen4-pci-ep: Add R-Car V4H compatible

[Yoshihiro Shimoda]

Document bindings for R-Car V4H (R8A779G0) PCIe endpoint module.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
---
 Documentation/devicetree/bindings/pci/rcar-gen4-pci-ep.yaml | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/pci/rcar-gen4-pci-ep.yaml b/Documentation/devicetree/bindings/pci/rcar-gen4-pci-ep.yaml
index fe38f62da066..91b81ac75592 100644
--- a/Documentation/devicetree/bindings/pci/rcar-gen4-pci-ep.yaml
+++ b/Documentation/devicetree/bindings/pci/rcar-gen4-pci-ep.yaml
@@ -16,7 +16,9 @@ allOf:
 properties:
   compatible:
     items:
-      - const: renesas,r8a779f0-pcie-ep   # R-Car S4-8
+      - enum:
+          - renesas,r8a779f0-pcie-ep      # R-Car S4-8
+          - renesas,r8a779g0-pcie-ep      # R-Car V4H
       - const: renesas,rcar-gen4-pcie-ep  # R-Car Gen4
 
   reg:
-- 
2.25.1

Re: [PATCH 2/6] dt-bindings: PCI: rcar-gen4-pci-ep: Add R-Car V4H compatible

[Conor Dooley]

[-- Attachment #1: Type: text/plain, Size: 1108 bytes --]

On Thu, Feb 29, 2024 at 09:07:15PM +0900, Yoshihiro Shimoda wrote:
> Document bindings for R-Car V4H (R8A779G0) PCIe endpoint module.
> 
> Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>

Acked-by: Conor Dooley <conor.dooley@microchip.com>

Cheers,
Conor.

> ---
>  Documentation/devicetree/bindings/pci/rcar-gen4-pci-ep.yaml | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/pci/rcar-gen4-pci-ep.yaml b/Documentation/devicetree/bindings/pci/rcar-gen4-pci-ep.yaml
> index fe38f62da066..91b81ac75592 100644
> --- a/Documentation/devicetree/bindings/pci/rcar-gen4-pci-ep.yaml
> +++ b/Documentation/devicetree/bindings/pci/rcar-gen4-pci-ep.yaml
> @@ -16,7 +16,9 @@ allOf:
>  properties:
>    compatible:
>      items:
> -      - const: renesas,r8a779f0-pcie-ep   # R-Car S4-8
> +      - enum:
> +          - renesas,r8a779f0-pcie-ep      # R-Car S4-8
> +          - renesas,r8a779g0-pcie-ep      # R-Car V4H
>        - const: renesas,rcar-gen4-pcie-ep  # R-Car Gen4
>  
>    reg:
> -- 
> 2.25.1
> 

[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 228 bytes --]

Re: [PATCH 2/6] dt-bindings: PCI: rcar-gen4-pci-ep: Add R-Car V4H compatible

[Geert Uytterhoeven]

On Thu, Feb 29, 2024 at 1:07 PM Yoshihiro Shimoda
<yoshihiro.shimoda.uh@renesas.com> wrote:
> Document bindings for R-Car V4H (R8A779G0) PCIe endpoint module.
>
> Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>

Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

[PATCH 3/6] PCI: dwc: Add PCIE_PORT_{FORCE,LANE_SKEW} macros

[Yoshihiro Shimoda]

R-Car Gen4 PCIe controller needs to use the Synopsys-specific PCIe
configuration registers. So, add the macros.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
---
 drivers/pci/controller/dwc/pcie-designware.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index 26dae4837462..aa4db6eaf02a 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -71,6 +71,9 @@
 #define LINK_WAIT_IATU			9
 
 /* Synopsys-specific PCIe configuration registers */
+#define PCIE_PORT_FORCE			0x708
+#define PORT_FORCE_DO_DESKEW_FOR_SRIS	BIT(23)
+
 #define PCIE_PORT_AFR			0x70C
 #define PORT_AFR_N_FTS_MASK		GENMASK(15, 8)
 #define PORT_AFR_N_FTS(n)		FIELD_PREP(PORT_AFR_N_FTS_MASK, n)
@@ -92,6 +95,9 @@
 #define PORT_LINK_MODE_4_LANES		PORT_LINK_MODE(0x7)
 #define PORT_LINK_MODE_8_LANES		PORT_LINK_MODE(0xf)
 
+#define PCIE_PORT_LANE_SKEW		0x714
+#define PORT_LANE_SKEW_INSERT_MASK	GENMASK(23, 0)
+
 #define PCIE_PORT_DEBUG0		0x728
 #define PORT_LOGIC_LTSSM_STATE_MASK	0x1f
 #define PORT_LOGIC_LTSSM_STATE_L0	0x11
-- 
2.25.1

[PATCH 4/6] PCI: dwc: rcar-gen4: Add a new function pointer for other SoC support

[Yoshihiro Shimoda]

This driver can reuse other R-Car Gen4 SoC support. However, some
initializing settings differs between r8a779f0 and others. So, add
a new function pointer start_link_enable() to support other R-Car
Gen4 SoC in the future. No behavior changes.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
---
 drivers/pci/controller/dwc/pcie-rcar-gen4.c | 57 +++++++++++++++++++--
 1 file changed, 52 insertions(+), 5 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-rcar-gen4.c b/drivers/pci/controller/dwc/pcie-rcar-gen4.c
index e9166619b1f9..9f4d868c1703 100644
--- a/drivers/pci/controller/dwc/pcie-rcar-gen4.c
+++ b/drivers/pci/controller/dwc/pcie-rcar-gen4.c
@@ -53,9 +53,16 @@ struct rcar_gen4_pcie {
 	void __iomem *base;
 	struct platform_device *pdev;
 	enum dw_pcie_device_mode mode;
+
+	int (*start_link_enable)(struct rcar_gen4_pcie *rcar);
 };
 #define to_rcar_gen4_pcie(_dw)	container_of(_dw, struct rcar_gen4_pcie, dw)
 
+struct rcar_gen4_pcie_platdata {
+	enum dw_pcie_device_mode mode;
+	int (*start_link_enable)(struct rcar_gen4_pcie *rcar);
+};
+
 /* Common */
 static void rcar_gen4_pcie_ltssm_enable(struct rcar_gen4_pcie *rcar,
 					bool enable)
@@ -123,9 +130,13 @@ static int rcar_gen4_pcie_speed_change(struct dw_pcie *dw)
 static int rcar_gen4_pcie_start_link(struct dw_pcie *dw)
 {
 	struct rcar_gen4_pcie *rcar = to_rcar_gen4_pcie(dw);
-	int i, changes;
+	int i, changes, ret;
 
-	rcar_gen4_pcie_ltssm_enable(rcar, true);
+	if (rcar->start_link_enable) {
+		ret = rcar->start_link_enable(rcar);
+		if (ret)
+			return ret;
+	}
 
 	/*
 	 * Require direct speed change with retrying here if the link_gen is
@@ -435,7 +446,10 @@ static void rcar_gen4_remove_dw_pcie_ep(struct rcar_gen4_pcie *rcar)
 /* Common */
 static int rcar_gen4_add_dw_pcie(struct rcar_gen4_pcie *rcar)
 {
-	rcar->mode = (uintptr_t)of_device_get_match_data(&rcar->pdev->dev);
+	const struct rcar_gen4_pcie_platdata *pd = of_device_get_match_data(&rcar->pdev->dev);
+
+	rcar->mode = pd->mode;
+	rcar->start_link_enable = pd->start_link_enable;
 
 	switch (rcar->mode) {
 	case DW_PCIE_RC_TYPE:
@@ -498,14 +512,47 @@ static void rcar_gen4_pcie_remove(struct platform_device *pdev)
 	rcar_gen4_pcie_unprepare(rcar);
 }
 
+static int r8a779f0_pcie_start_link_enable(struct rcar_gen4_pcie *rcar)
+{
+	rcar_gen4_pcie_ltssm_enable(rcar, true);
+
+	return 0;
+}
+
+static struct rcar_gen4_pcie_platdata platdata_r8a779f0_pcie = {
+	.mode = DW_PCIE_RC_TYPE,
+	.start_link_enable = r8a779f0_pcie_start_link_enable,
+};
+
+static struct rcar_gen4_pcie_platdata platdata_r8a779f0_pcie_ep = {
+	.mode = DW_PCIE_EP_TYPE,
+	.start_link_enable = r8a779f0_pcie_start_link_enable,
+};
+
+static struct rcar_gen4_pcie_platdata platdata_rcar_gen4_pcie = {
+	.mode = DW_PCIE_RC_TYPE,
+};
+
+static struct rcar_gen4_pcie_platdata platdata_rcar_gen4_pcie_ep = {
+	.mode = DW_PCIE_EP_TYPE,
+};
+
 static const struct of_device_id rcar_gen4_pcie_of_match[] = {
+	{
+		.compatible = "renesas,r8a779f0-pcie",
+		.data = &platdata_r8a779f0_pcie,
+	},
+	{
+		.compatible = "renesas,r8a779f0-pcie-ep",
+		.data = &platdata_r8a779f0_pcie_ep,
+	},
 	{
 		.compatible = "renesas,rcar-gen4-pcie",
-		.data = (void *)DW_PCIE_RC_TYPE,
+		.data = &platdata_rcar_gen4_pcie,
 	},
 	{
 		.compatible = "renesas,rcar-gen4-pcie-ep",
-		.data = (void *)DW_PCIE_EP_TYPE,
+		.data = &platdata_rcar_gen4_pcie_ep,
 	},
 	{},
 };
-- 
2.25.1

[PATCH 5/6] PCI: dwc: rcar-gen4: Add support for other R-Car Gen4 PCIe controller

[Yoshihiro Shimoda]

The PCIe controllers of R-Car V4H (r8a779g0) and one more SoC require
different initializing settings than R-Car S4-8 (r8a779f0). So, add
specific functions for them as "renesas,rcar-gen4-pcie{-ep}" compatible.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
---
 drivers/pci/controller/dwc/pcie-rcar-gen4.c | 188 +++++++++++++++++++-
 1 file changed, 187 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/controller/dwc/pcie-rcar-gen4.c b/drivers/pci/controller/dwc/pcie-rcar-gen4.c
index 9f4d868c1703..275bc6155bb5 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
@@ -37,33 +40,179 @@
 #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)
+
 #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_FIRMEARE_NAME		"rcar_gen4_pcie.bin"
+#define RCAR_GEN4_PCIE_FIRMEARE_BASE_ADDR	0xc000
+
 struct rcar_gen4_pcie {
 	struct dw_pcie dw;
 	void __iomem *base;
+	/*
+	 * The R-Car Gen4 documents don't describe the PHY registers' name.
+	 * But, the initialization procedure describes these offsets. So,
+	 * this driver has "phy_base + magical offset number" for it.
+	 */
+	void __iomem *phy_base;
 	struct platform_device *pdev;
 	enum dw_pcie_device_mode mode;
 
 	int (*start_link_enable)(struct rcar_gen4_pcie *rcar);
+	void (*additional_common_init)(struct rcar_gen4_pcie *rcar);
 };
 #define to_rcar_gen4_pcie(_dw)	container_of(_dw, struct rcar_gen4_pcie, dw)
 
 struct rcar_gen4_pcie_platdata {
 	enum dw_pcie_device_mode mode;
 	int (*start_link_enable)(struct rcar_gen4_pcie *rcar);
+	void (*additional_common_init)(struct rcar_gen4_pcie *rcar);
 };
 
 /* 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_bit(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_update_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_FIRMEARE_NAME, dw->dev);
+	if (ret)
+		return ret;
+
+	for (i = 0; i < (fw->size / 2); i++) {
+		data = fw->data[i * 2] | fw->data[(i * 2) + 1] << 8;
+		timeout = 100;
+retry_data:
+		dw_pcie_writel_dbi(dw, PRTLGC89, RCAR_GEN4_PCIE_FIRMEARE_BASE_ADDR + i);
+		dw_pcie_writel_dbi(dw, PRTLGC90, data);
+		if (rcar_gen4_pcie_reg_check_bit(rcar, PRTLGC89, BIT(30)) < 0) {
+			if (!(--timeout)) {
+				ret = -ETIMEDOUT;
+				goto exit;
+			}
+			usleep_range(100, 200);
+			goto retry_data;
+		}
+	}
+
+	rcar_gen4_pcie_phy_reg_update_bits(rcar, 0x0f8, BIT(17), BIT(17));
+
+	for (i = 0; i < ARRAY_SIZE(check_addr); i++) {
+		timeout = 100;
+retry_check:
+		dw_pcie_writel_dbi(dw, PRTLGC89, check_addr[i]);
+		ret = rcar_gen4_pcie_reg_check_bit(rcar, PRTLGC89, BIT(30));
+		ret |= rcar_gen4_pcie_reg_check_bit(rcar, PRTLGC90, BIT(0));
+		if (ret < 0) {
+			if (!(--timeout)) {
+				ret = -ETIMEDOUT;
+				goto exit;
+			}
+			usleep_range(100, 200);
+			goto retry_check;
+		}
+	}
+
+	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, 0x700, BIT(28), 0);
+	rcar_gen4_pcie_phy_reg_update_bits(rcar, 0x700, BIT(20), 0);
+	rcar_gen4_pcie_phy_reg_update_bits(rcar, 0x700, BIT(12), 0);
+	rcar_gen4_pcie_phy_reg_update_bits(rcar, 0x700, BIT(4), 0);
+
+	rcar_gen4_pcie_phy_reg_update_bits(rcar, 0x148, GENMASK(23, 22), BIT(22));
+	rcar_gen4_pcie_phy_reg_update_bits(rcar, 0x148, GENMASK(18, 16), GENMASK(17, 16));
+	rcar_gen4_pcie_phy_reg_update_bits(rcar, 0x148, GENMASK(7, 6), BIT(6));
+	rcar_gen4_pcie_phy_reg_update_bits(rcar, 0x148, GENMASK(2, 0), GENMASK(11, 0));
+	rcar_gen4_pcie_phy_reg_update_bits(rcar, 0x1d4, GENMASK(16, 15), GENMASK(16, 15));
+	rcar_gen4_pcie_phy_reg_update_bits(rcar, 0x514, BIT(26), BIT(26));
+	rcar_gen4_pcie_phy_reg_update_bits(rcar, 0x0f8, BIT(16), 0);
+	rcar_gen4_pcie_phy_reg_update_bits(rcar, 0x0f8, 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 + 0x0f8, val, !(val & BIT(18)),
+				 100, 10000);
+	if (ret < 0)
+		return ret;
+
+	ret = rcar_gen4_pcie_update_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_enable(struct rcar_gen4_pcie *rcar,
 					bool enable)
 {
@@ -201,6 +350,9 @@ static int rcar_gen4_pcie_common_init(struct rcar_gen4_pcie *rcar)
 	if (ret)
 		goto err_unprepare;
 
+	if (rcar->additional_common_init)
+		rcar->additional_common_init(rcar);
+
 	return 0;
 
 err_unprepare:
@@ -242,6 +394,10 @@ 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->base);
+
 	/* Renesas-specific registers */
 	rcar->base = devm_platform_ioremap_resource_byname(rcar->pdev, "app");
 
@@ -450,6 +606,7 @@ static int rcar_gen4_add_dw_pcie(struct rcar_gen4_pcie *rcar)
 
 	rcar->mode = pd->mode;
 	rcar->start_link_enable = pd->start_link_enable;
+	rcar->additional_common_init = pd->additional_common_init;
 
 	switch (rcar->mode) {
 	case DW_PCIE_RC_TYPE:
@@ -519,6 +676,31 @@ static int r8a779f0_pcie_start_link_enable(struct rcar_gen4_pcie *rcar)
 	return 0;
 }
 
+static int rcar_gen4_pcie_start_link_enable(struct rcar_gen4_pcie *rcar)
+{
+	return rcar_gen4_pcie_enable_phy(rcar);
+}
+
+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 struct rcar_gen4_pcie_platdata platdata_r8a779f0_pcie = {
 	.mode = DW_PCIE_RC_TYPE,
 	.start_link_enable = r8a779f0_pcie_start_link_enable,
@@ -531,10 +713,14 @@ static struct rcar_gen4_pcie_platdata platdata_r8a779f0_pcie_ep = {
 
 static struct rcar_gen4_pcie_platdata platdata_rcar_gen4_pcie = {
 	.mode = DW_PCIE_RC_TYPE,
+	.start_link_enable = rcar_gen4_pcie_start_link_enable,
+	.additional_common_init = rcar_gen4_pcie_additional_common_init,
 };
 
 static struct rcar_gen4_pcie_platdata platdata_rcar_gen4_pcie_ep = {
 	.mode = DW_PCIE_EP_TYPE,
+	.start_link_enable = rcar_gen4_pcie_start_link_enable,
+	.additional_common_init = rcar_gen4_pcie_additional_common_init,
 };
 
 static const struct of_device_id rcar_gen4_pcie_of_match[] = {
-- 
2.25.1

[PATCH 6/6] misc: pci_endpoint_test: Add Device ID for R-Car V4H PCIe controller

[Yoshihiro Shimoda]

Add Renesas R8A779G0 in pci_device_id table so that pci-epf-test
can be used for testing PCIe EP on R-Car V4H.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
---
 drivers/misc/pci_endpoint_test.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/misc/pci_endpoint_test.c b/drivers/misc/pci_endpoint_test.c
index c38a6083f0a7..2fa3c6473c7d 100644
--- a/drivers/misc/pci_endpoint_test.c
+++ b/drivers/misc/pci_endpoint_test.c
@@ -83,6 +83,7 @@
 #define PCI_DEVICE_ID_RENESAS_R8A774C0		0x002d
 #define PCI_DEVICE_ID_RENESAS_R8A774E1		0x0025
 #define PCI_DEVICE_ID_RENESAS_R8A779F0		0x0031
+#define PCI_DEVICE_ID_RENESAS_R8A779G0		0x0030
 
 static DEFINE_IDA(pci_endpoint_test_ida);
 
@@ -1005,6 +1006,9 @@ static const struct pci_device_id pci_endpoint_test_tbl[] = {
 	{ PCI_DEVICE(PCI_VENDOR_ID_RENESAS, PCI_DEVICE_ID_RENESAS_R8A779F0),
 	  .driver_data = (kernel_ulong_t)&default_data,
 	},
+	{ PCI_DEVICE(PCI_VENDOR_ID_RENESAS, PCI_DEVICE_ID_RENESAS_R8A779G0),
+	  .driver_data = (kernel_ulong_t)&default_data,
+	},
 	{ PCI_DEVICE(PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_J721E),
 	  .driver_data = (kernel_ulong_t)&j721e_data,
 	},
-- 
2.25.1

Re: [PATCH 6/6] misc: pci_endpoint_test: Add Device ID for R-Car V4H PCIe controller

[Geert Uytterhoeven]

Hi Shimoda-san,

On Thu, Feb 29, 2024 at 1:07 PM Yoshihiro Shimoda
<yoshihiro.shimoda.uh@renesas.com> wrote:
> Add Renesas R8A779G0 in pci_device_id table so that pci-epf-test
> can be used for testing PCIe EP on R-Car V4H.
>
> Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>

Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds