[PATCH v3 0/6] Add DW PCIe support for Exynos5433 SoCs

[PATCH v3 0/6] Add DW PCIe support for Exynos5433 SoCs

[Marek Szyprowski]

Dear All,

This patchset is a resurrection of the DW PCIe support for the Exynos5433
SoCs posted long time ago here: https://lkml.org/lkml/2016/12/26/6 and
later here: https://lkml.org/lkml/2017/12/21/296 .

In meantime the support for the Exynos5440 SoCs has been completely
dropped from mainline kernel, as those SoCs never reached the market. The
PCIe driver for Exynos5440 variant however has not been removed yet. This
patchset simply reworks it to support the Exynos5433 variant. The lack of
the need to support both variants significantly simplifies the driver
code.

This patchset is based on the following branch:
git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git pci-more-dwc-cleanup

Best regards,
Marek Szyprowski


Changelog:

v3:
- rebased onto "[00/13] PCI: dwc: Another round of clean-ups" patchset:
  https://patchwork.kernel.org/project/linux-samsung-soc/cover/20201028204646.356535-1-robh@kernel.org/
- fixed issues pointed by Rob in the driver logic:
  * removed DBI_RO_WR_EN register poking
  * made driver a standard module
- fixed section mismatch issue
- added "num-viewport = <3>" property to dts and bindings to fix warning

v2: https://lore.kernel.org/linux-samsung-soc/20201023075744.26200-1-m.szyprowski@samsung.com/
- fixed issues in dt-bindings pointed by Krzysztof and Rob

v1: https://lore.kernel.org/linux-samsung-soc/20201019094715.15343-1-m.szyprowski@samsung.com/
- initial version of this resurrected patchset


Patch summary:

Jaehoon Chung (3):
  phy: samsung: phy-exynos-pcie: rework driver to support Exynos5433
    PCIe PHY
  pci: dwc: pci-exynos: rework the driver to support Exynos5433 variant
  arm64: dts: exynos: add the WiFi/PCIe support to TM2(e) boards

Marek Szyprowski (3):
  dt-bindings: pci: drop samsung,exynos5440-pcie binding
  dt-bindings: pci: add the samsung,exynos-pcie binding
  dt-bindings: phy: add the samsung,exynos-pcie-phy binding

 .../bindings/pci/samsung,exynos-pcie.yaml     | 119 ++++++
 .../bindings/pci/samsung,exynos5440-pcie.txt  |  58 ---
 .../bindings/phy/samsung,exynos-pcie-phy.yaml |  51 +++
 .../boot/dts/exynos/exynos5433-pinctrl.dtsi   |   2 +-
 .../dts/exynos/exynos5433-tm2-common.dtsi     |  24 +-
 arch/arm64/boot/dts/exynos/exynos5433.dtsi    |  36 ++
 drivers/pci/controller/dwc/Kconfig            |  10 +-
 drivers/pci/controller/dwc/pci-exynos.c       | 353 +++++++-----------
 drivers/pci/quirks.c                          |   1 +
 drivers/phy/samsung/phy-exynos-pcie.c         | 304 ++++++---------
 10 files changed, 489 insertions(+), 469 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/pci/samsung,exynos-pcie.yaml
 delete mode 100644 Documentation/devicetree/bindings/pci/samsung,exynos5440-pcie.txt
 create mode 100644 Documentation/devicetree/bindings/phy/samsung,exynos-pcie-phy.yaml

-- 
2.17.1

[PATCH v3 1/6] dt-bindings: pci: drop samsung,exynos5440-pcie binding

[Marek Szyprowski]

Exynos5440 SoC support has been dropped since commit 8c83315da1cf ("ARM:
dts: exynos: Remove Exynos5440"). Drop the obsolete bindings for
exynos5440-pcie.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Reviewed-by: Jingoo Han <jingoohan1@gmail.com>
---
 .../bindings/pci/samsung,exynos5440-pcie.txt  | 58 -------------------
 1 file changed, 58 deletions(-)
 delete mode 100644 Documentation/devicetree/bindings/pci/samsung,exynos5440-pcie.txt

diff --git a/Documentation/devicetree/bindings/pci/samsung,exynos5440-pcie.txt b/Documentation/devicetree/bindings/pci/samsung,exynos5440-pcie.txt
deleted file mode 100644
index 651d957d1051..000000000000
--- a/Documentation/devicetree/bindings/pci/samsung,exynos5440-pcie.txt
+++ /dev/null
@@ -1,58 +0,0 @@
-* Samsung Exynos 5440 PCIe interface
-
-This PCIe host controller is based on the Synopsys DesignWare PCIe IP
-and thus inherits all the common properties defined in designware-pcie.txt.
-
-Required properties:
-- compatible: "samsung,exynos5440-pcie"
-- reg: base addresses and lengths of the PCIe controller,
-- reg-names : First name should be set to "elbi".
-	And use the "config" instead of getting the configuration address space
-	from "ranges".
-	NOTE: When using the "config" property, reg-names must be set.
-- interrupts: A list of interrupt outputs for level interrupt,
-	pulse interrupt, special interrupt.
-- phys: From PHY binding. Phandle for the generic PHY.
-	Refer to Documentation/devicetree/bindings/phy/samsung-phy.txt
-
-For other common properties, refer to
-	Documentation/devicetree/bindings/pci/designware-pcie.txt
-
-Example:
-
-SoC-specific DT Entry (with using PHY framework):
-
-	pcie_phy0: pcie-phy@270000 {
-		...
-		reg = <0x270000 0x1000>, <0x271000 0x40>;
-		reg-names = "phy", "block";
-		...
-	};
-
-	pcie@290000 {
-		compatible = "samsung,exynos5440-pcie", "snps,dw-pcie";
-		reg = <0x290000 0x1000>, <0x40000000 0x1000>;
-		reg-names = "elbi", "config";
-		clocks = <&clock 28>, <&clock 27>;
-		clock-names = "pcie", "pcie_bus";
-		#address-cells = <3>;
-		#size-cells = <2>;
-		device_type = "pci";
-		phys = <&pcie_phy0>;
-		ranges = <0x81000000 0 0	  0x60001000 0 0x00010000
-			  0x82000000 0 0x60011000 0x60011000 0 0x1ffef000>;
-		#interrupt-cells = <1>;
-		interrupt-map-mask = <0 0 0 0>;
-		interrupt-map = <0 0 0 0 &gic GIC_SPI 21 IRQ_TYPE_LEVEL_HIGH>;
-		num-lanes = <4>;
-	};
-
-Board-specific DT Entry:
-
-	pcie@290000 {
-		reset-gpio = <&pin_ctrl 5 0>;
-	};
-
-	pcie@2a0000 {
-		reset-gpio = <&pin_ctrl 22 0>;
-	};
-- 
2.17.1

[PATCH v3 2/6] dt-bindings: pci: add the samsung,exynos-pcie binding

[Marek Szyprowski]

Add dt-bindings for the Samsung Exynos PCIe controller (Exynos5433
variant). Based on the text dt-binding posted by Jaehoon Chung.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
---
 .../bindings/pci/samsung,exynos-pcie.yaml     | 119 ++++++++++++++++++
 1 file changed, 119 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pci/samsung,exynos-pcie.yaml

diff --git a/Documentation/devicetree/bindings/pci/samsung,exynos-pcie.yaml b/Documentation/devicetree/bindings/pci/samsung,exynos-pcie.yaml
new file mode 100644
index 000000000000..1810bf722350
--- /dev/null
+++ b/Documentation/devicetree/bindings/pci/samsung,exynos-pcie.yaml
@@ -0,0 +1,119 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pci/samsung,exynos-pcie.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Samsung SoC series PCIe Host Controller Device Tree Bindings
+
+maintainers:
+  - Marek Szyprowski <m.szyprowski@samsung.com>
+  - Jaehoon Chung <jh80.chung@samsung.com>
+
+description: |+
+  Exynos5433 SoC PCIe host controller is based on the Synopsys DesignWare
+  PCIe IP and thus inherits all the common properties defined in
+  designware-pcie.txt.
+
+allOf:
+  - $ref: /schemas/pci/pci-bus.yaml#
+
+properties:
+  compatible:
+    const: samsung,exynos5433-pcie
+
+  reg:
+    items:
+      - description: Data Bus Interface (DBI) registers.
+      - description: External Local Bus interface (ELBI) registers.
+      - description: PCIe configuration space region.
+
+  reg-names:
+    items:
+      - const: dbi
+      - const: elbi
+      - const: config
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    items:
+      - description: PCIe bridge clock
+      - description: PCIe bus clock
+
+  clock-names:
+    items:
+      - const: pcie
+      - const: pcie_bus
+
+  phys:
+    maxItems: 1
+
+  vdd10-supply:
+    description:
+      Phandle to a regulator that provides 1.0V power to the PCIe block.
+
+  vdd18-supply:
+    description:
+      Phandle to a regulator that provides 1.8V power to the PCIe block.
+
+  num-lanes:
+    const: 1
+
+  num-viewport:
+    const: 3
+
+required:
+  - reg
+  - reg-names
+  - interrupts
+  - "#address-cells"
+  - "#size-cells"
+  - "#interrupt-cells"
+  - interrupt-map
+  - interrupt-map-mask
+  - ranges
+  - bus-range
+  - device_type
+  - num-lanes
+  - num-viewport
+  - clocks
+  - clock-names
+  - phys
+  - vdd10-supply
+  - vdd18-supply
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/clock/exynos5433.h>
+
+    pcie: pcie@15700000 {
+        compatible = "samsung,exynos5433-pcie";
+        reg = <0x15700000 0x1000>, <0x156b0000 0x1000>, <0x0c000000 0x1000>;
+        reg-names = "dbi", "elbi", "config";
+        #address-cells = <3>;
+        #size-cells = <2>;
+        #interrupt-cells = <1>;
+        device_type = "pci";
+        interrupts = <GIC_SPI 245 IRQ_TYPE_LEVEL_HIGH>;
+        clocks = <&cmu_fsys CLK_PCIE>, <&cmu_fsys CLK_PCLK_PCIE_PHY>;
+        clock-names = "pcie", "pcie_bus";
+        phys = <&pcie_phy>;
+        pinctrl-0 = <&pcie_bus &pcie_wlanen>;
+        pinctrl-names = "default";
+        num-lanes = <1>;
+        num-viewport = <3>;
+        bus-range = <0x00 0xff>;
+        ranges = <0x81000000 0 0	  0x0c001000 0 0x00010000>,
+                 <0x82000000 0 0x0c011000 0x0c011000 0 0x03feefff>;
+        vdd10-supply = <&ldo6_reg>;
+        vdd18-supply = <&ldo7_reg>;
+        interrupt-map-mask = <0 0 0 0>;
+        interrupt-map = <0 0 0 0 &gic GIC_SPI 245 IRQ_TYPE_LEVEL_HIGH>;
+    };
+...
-- 
2.17.1

[PATCH v3 3/6] dt-bindings: phy: add the samsung,exynos-pcie-phy binding

[Marek Szyprowski]

Add dt-bindings for the Samsung Exynos PCIe PHY controller (Exynos5433
variant). Based on the text dt-binding posted by Jaehoon Chung.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
---
 .../bindings/phy/samsung,exynos-pcie-phy.yaml | 51 +++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/phy/samsung,exynos-pcie-phy.yaml

diff --git a/Documentation/devicetree/bindings/phy/samsung,exynos-pcie-phy.yaml b/Documentation/devicetree/bindings/phy/samsung,exynos-pcie-phy.yaml
new file mode 100644
index 000000000000..ac0af40be52d
--- /dev/null
+++ b/Documentation/devicetree/bindings/phy/samsung,exynos-pcie-phy.yaml
@@ -0,0 +1,51 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/phy/samsung,exynos-pcie-phy.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Samsung SoC series PCIe PHY Device Tree Bindings
+
+maintainers:
+  - Marek Szyprowski <m.szyprowski@samsung.com>
+  - Jaehoon Chung <jh80.chung@samsung.com>
+
+properties:
+  "#phy-cells":
+    const: 0
+
+  compatible:
+    const: samsung,exynos5433-pcie-phy
+
+  reg:
+    maxItems: 1
+
+  samsung,pmu-syscon:
+    $ref: '/schemas/types.yaml#/definitions/phandle'
+    description: phandle for PMU system controller interface, used to
+                 control PMU registers bits for PCIe PHY
+
+  samsung,fsys-sysreg:
+    $ref: '/schemas/types.yaml#/definitions/phandle'
+    description: phandle for FSYS sysreg interface, used to control
+                 sysreg registers bits for PCIe PHY
+
+required:
+  - "#phy-cells"
+  - compatible
+  - reg
+  - samsung,pmu-syscon
+  - samsung,fsys-sysreg
+
+additionalProperties: false
+
+examples:
+  - |
+    pcie_phy: pcie-phy@15680000 {
+        compatible = "samsung,exynos5433-pcie-phy";
+        reg = <0x15680000 0x1000>;
+        samsung,pmu-syscon = <&pmu_system_controller>;
+        samsung,fsys-sysreg = <&syscon_fsys>;
+        #phy-cells = <0>;
+    };
+...
-- 
2.17.1

[PATCH v3 4/6] phy: samsung: phy-exynos-pcie: rework driver to support Exynos5433 PCIe PHY

[Marek Szyprowski]

From: Jaehoon Chung <jh80.chung@samsung.com>

Exynos5440 SoC support has been dropped since commit 8c83315da1cf ("ARM:
dts: exynos: Remove Exynos5440"). Rework this driver to support PCIe PHY
variant found in the Exynos5433 SoCs.

Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
[mszyprow: reworked the driver to support only Exynos5433 variant, rebased
	   onto current kernel code, rewrote commit message]
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Krzysztof Kozlowski <krzk@kernel.org>
Reviewed-by: Jingoo Han <jingoohan1@gmail.com>
---
 drivers/phy/samsung/phy-exynos-pcie.c | 304 ++++++++++----------------
 1 file changed, 112 insertions(+), 192 deletions(-)

diff --git a/drivers/phy/samsung/phy-exynos-pcie.c b/drivers/phy/samsung/phy-exynos-pcie.c
index 7e28b1aea0d1..d91de323dd0e 100644
--- a/drivers/phy/samsung/phy-exynos-pcie.c
+++ b/drivers/phy/samsung/phy-exynos-pcie.c
@@ -4,70 +4,41 @@
  *
  * Phy provider for PCIe controller on Exynos SoC series
  *
- * Copyright (C) 2017 Samsung Electronics Co., Ltd.
+ * Copyright (C) 2017-2020 Samsung Electronics Co., Ltd.
  * Jaehoon Chung <jh80.chung@samsung.com>
  */
 
-#include <linux/delay.h>
 #include <linux/io.h>
-#include <linux/iopoll.h>
-#include <linux/init.h>
 #include <linux/mfd/syscon.h>
-#include <linux/of.h>
-#include <linux/of_address.h>
 #include <linux/of_platform.h>
 #include <linux/platform_device.h>
 #include <linux/phy/phy.h>
 #include <linux/regmap.h>
 
-/* PCIe Purple registers */
-#define PCIE_PHY_GLOBAL_RESET		0x000
-#define PCIE_PHY_COMMON_RESET		0x004
-#define PCIE_PHY_CMN_REG		0x008
-#define PCIE_PHY_MAC_RESET		0x00c
-#define PCIE_PHY_PLL_LOCKED		0x010
-#define PCIE_PHY_TRSVREG_RESET		0x020
-#define PCIE_PHY_TRSV_RESET		0x024
-
-/* PCIe PHY registers */
-#define PCIE_PHY_IMPEDANCE		0x004
-#define PCIE_PHY_PLL_DIV_0		0x008
-#define PCIE_PHY_PLL_BIAS		0x00c
-#define PCIE_PHY_DCC_FEEDBACK		0x014
-#define PCIE_PHY_PLL_DIV_1		0x05c
-#define PCIE_PHY_COMMON_POWER		0x064
-#define PCIE_PHY_COMMON_PD_CMN		BIT(3)
-#define PCIE_PHY_TRSV0_EMP_LVL		0x084
-#define PCIE_PHY_TRSV0_DRV_LVL		0x088
-#define PCIE_PHY_TRSV0_RXCDR		0x0ac
-#define PCIE_PHY_TRSV0_POWER		0x0c4
-#define PCIE_PHY_TRSV0_PD_TSV		BIT(7)
-#define PCIE_PHY_TRSV0_LVCC		0x0dc
-#define PCIE_PHY_TRSV1_EMP_LVL		0x144
-#define PCIE_PHY_TRSV1_RXCDR		0x16c
-#define PCIE_PHY_TRSV1_POWER		0x184
-#define PCIE_PHY_TRSV1_PD_TSV		BIT(7)
-#define PCIE_PHY_TRSV1_LVCC		0x19c
-#define PCIE_PHY_TRSV2_EMP_LVL		0x204
-#define PCIE_PHY_TRSV2_RXCDR		0x22c
-#define PCIE_PHY_TRSV2_POWER		0x244
-#define PCIE_PHY_TRSV2_PD_TSV		BIT(7)
-#define PCIE_PHY_TRSV2_LVCC		0x25c
-#define PCIE_PHY_TRSV3_EMP_LVL		0x2c4
-#define PCIE_PHY_TRSV3_RXCDR		0x2ec
-#define PCIE_PHY_TRSV3_POWER		0x304
-#define PCIE_PHY_TRSV3_PD_TSV		BIT(7)
-#define PCIE_PHY_TRSV3_LVCC		0x31c
-
-struct exynos_pcie_phy_data {
-	const struct phy_ops	*ops;
-};
+#define PCIE_PHY_OFFSET(x)		((x) * 0x4)
+
+/* Sysreg FSYS register offsets and bits for Exynos5433 */
+#define PCIE_EXYNOS5433_PHY_MAC_RESET		0x0208
+#define PCIE_MAC_RESET_MASK			0xFF
+#define PCIE_MAC_RESET				BIT(4)
+#define PCIE_EXYNOS5433_PHY_L1SUB_CM_CON	0x1010
+#define PCIE_REFCLK_GATING_EN			BIT(0)
+#define PCIE_EXYNOS5433_PHY_COMMON_RESET	0x1020
+#define PCIE_PHY_RESET				BIT(0)
+#define PCIE_EXYNOS5433_PHY_GLOBAL_RESET	0x1040
+#define PCIE_GLOBAL_RESET			BIT(0)
+#define PCIE_REFCLK				BIT(1)
+#define PCIE_REFCLK_MASK			0x16
+#define PCIE_APP_REQ_EXIT_L1_MODE		BIT(5)
+
+/* PMU PCIE PHY isolation control */
+#define EXYNOS5433_PMU_PCIE_PHY_OFFSET		0x730
 
 /* For Exynos pcie phy */
 struct exynos_pcie_phy {
-	const struct exynos_pcie_phy_data *drv_data;
-	void __iomem *phy_base;
-	void __iomem *blk_base; /* For exynos5440 */
+	void __iomem *base;
+	struct regmap *pmureg;
+	struct regmap *fsysreg;
 };
 
 static void exynos_pcie_phy_writel(void __iomem *base, u32 val, u32 offset)
@@ -75,153 +46,103 @@ static void exynos_pcie_phy_writel(void __iomem *base, u32 val, u32 offset)
 	writel(val, base + offset);
 }
 
-static u32 exynos_pcie_phy_readl(void __iomem *base, u32 offset)
-{
-	return readl(base + offset);
-}
-
-/* For Exynos5440 specific functions */
-static int exynos5440_pcie_phy_init(struct phy *phy)
+/* Exynos5433 specific functions */
+static int exynos5433_pcie_phy_init(struct phy *phy)
 {
 	struct exynos_pcie_phy *ep = phy_get_drvdata(phy);
 
-	/* DCC feedback control off */
-	exynos_pcie_phy_writel(ep->phy_base, 0x29, PCIE_PHY_DCC_FEEDBACK);
-
-	/* set TX/RX impedance */
-	exynos_pcie_phy_writel(ep->phy_base, 0xd5, PCIE_PHY_IMPEDANCE);
-
-	/* set 50Mhz PHY clock */
-	exynos_pcie_phy_writel(ep->phy_base, 0x14, PCIE_PHY_PLL_DIV_0);
-	exynos_pcie_phy_writel(ep->phy_base, 0x12, PCIE_PHY_PLL_DIV_1);
-
-	/* set TX Differential output for lane 0 */
-	exynos_pcie_phy_writel(ep->phy_base, 0x7f, PCIE_PHY_TRSV0_DRV_LVL);
-
-	/* set TX Pre-emphasis Level Control for lane 0 to minimum */
-	exynos_pcie_phy_writel(ep->phy_base, 0x0, PCIE_PHY_TRSV0_EMP_LVL);
-
-	/* set RX clock and data recovery bandwidth */
-	exynos_pcie_phy_writel(ep->phy_base, 0xe7, PCIE_PHY_PLL_BIAS);
-	exynos_pcie_phy_writel(ep->phy_base, 0x82, PCIE_PHY_TRSV0_RXCDR);
-	exynos_pcie_phy_writel(ep->phy_base, 0x82, PCIE_PHY_TRSV1_RXCDR);
-	exynos_pcie_phy_writel(ep->phy_base, 0x82, PCIE_PHY_TRSV2_RXCDR);
-	exynos_pcie_phy_writel(ep->phy_base, 0x82, PCIE_PHY_TRSV3_RXCDR);
-
-	/* change TX Pre-emphasis Level Control for lanes */
-	exynos_pcie_phy_writel(ep->phy_base, 0x39, PCIE_PHY_TRSV0_EMP_LVL);
-	exynos_pcie_phy_writel(ep->phy_base, 0x39, PCIE_PHY_TRSV1_EMP_LVL);
-	exynos_pcie_phy_writel(ep->phy_base, 0x39, PCIE_PHY_TRSV2_EMP_LVL);
-	exynos_pcie_phy_writel(ep->phy_base, 0x39, PCIE_PHY_TRSV3_EMP_LVL);
-
-	/* set LVCC */
-	exynos_pcie_phy_writel(ep->phy_base, 0x20, PCIE_PHY_TRSV0_LVCC);
-	exynos_pcie_phy_writel(ep->phy_base, 0xa0, PCIE_PHY_TRSV1_LVCC);
-	exynos_pcie_phy_writel(ep->phy_base, 0xa0, PCIE_PHY_TRSV2_LVCC);
-	exynos_pcie_phy_writel(ep->phy_base, 0xa0, PCIE_PHY_TRSV3_LVCC);
-
-	/* pulse for common reset */
-	exynos_pcie_phy_writel(ep->blk_base, 1, PCIE_PHY_COMMON_RESET);
-	udelay(500);
-	exynos_pcie_phy_writel(ep->blk_base, 0, PCIE_PHY_COMMON_RESET);
-
+	regmap_update_bits(ep->fsysreg,	PCIE_EXYNOS5433_PHY_COMMON_RESET,
+			   PCIE_PHY_RESET, 1);
+	regmap_update_bits(ep->fsysreg, PCIE_EXYNOS5433_PHY_MAC_RESET,
+			   PCIE_MAC_RESET, 0);
+
+	/* PHY refclk 24MHz */
+	regmap_update_bits(ep->fsysreg, PCIE_EXYNOS5433_PHY_GLOBAL_RESET,
+			   PCIE_REFCLK_MASK, PCIE_REFCLK);
+	regmap_update_bits(ep->fsysreg, PCIE_EXYNOS5433_PHY_GLOBAL_RESET,
+			   PCIE_GLOBAL_RESET, 0);
+
+
+	exynos_pcie_phy_writel(ep->base, 0x11, PCIE_PHY_OFFSET(0x3));
+
+	/* band gap reference on */
+	exynos_pcie_phy_writel(ep->base, 0, PCIE_PHY_OFFSET(0x20));
+	exynos_pcie_phy_writel(ep->base, 0, PCIE_PHY_OFFSET(0x4b));
+
+	/* jitter tunning */
+	exynos_pcie_phy_writel(ep->base, 0x34, PCIE_PHY_OFFSET(0x4));
+	exynos_pcie_phy_writel(ep->base, 0x02, PCIE_PHY_OFFSET(0x7));
+	exynos_pcie_phy_writel(ep->base, 0x41, PCIE_PHY_OFFSET(0x21));
+	exynos_pcie_phy_writel(ep->base, 0x7F, PCIE_PHY_OFFSET(0x14));
+	exynos_pcie_phy_writel(ep->base, 0xC0, PCIE_PHY_OFFSET(0x15));
+	exynos_pcie_phy_writel(ep->base, 0x61, PCIE_PHY_OFFSET(0x36));
+
+	/* D0 uninit.. */
+	exynos_pcie_phy_writel(ep->base, 0x44, PCIE_PHY_OFFSET(0x3D));
+
+	/* 24MHz */
+	exynos_pcie_phy_writel(ep->base, 0x94, PCIE_PHY_OFFSET(0x8));
+	exynos_pcie_phy_writel(ep->base, 0xA7, PCIE_PHY_OFFSET(0x9));
+	exynos_pcie_phy_writel(ep->base, 0x93, PCIE_PHY_OFFSET(0xA));
+	exynos_pcie_phy_writel(ep->base, 0x6B, PCIE_PHY_OFFSET(0xC));
+	exynos_pcie_phy_writel(ep->base, 0xA5, PCIE_PHY_OFFSET(0xF));
+	exynos_pcie_phy_writel(ep->base, 0x34, PCIE_PHY_OFFSET(0x16));
+	exynos_pcie_phy_writel(ep->base, 0xA3, PCIE_PHY_OFFSET(0x17));
+	exynos_pcie_phy_writel(ep->base, 0xA7, PCIE_PHY_OFFSET(0x1A));
+	exynos_pcie_phy_writel(ep->base, 0x71, PCIE_PHY_OFFSET(0x23));
+	exynos_pcie_phy_writel(ep->base, 0x4C, PCIE_PHY_OFFSET(0x24));
+
+	exynos_pcie_phy_writel(ep->base, 0x0E, PCIE_PHY_OFFSET(0x26));
+	exynos_pcie_phy_writel(ep->base, 0x14, PCIE_PHY_OFFSET(0x7));
+	exynos_pcie_phy_writel(ep->base, 0x48, PCIE_PHY_OFFSET(0x43));
+	exynos_pcie_phy_writel(ep->base, 0x44, PCIE_PHY_OFFSET(0x44));
+	exynos_pcie_phy_writel(ep->base, 0x03, PCIE_PHY_OFFSET(0x45));
+	exynos_pcie_phy_writel(ep->base, 0xA7, PCIE_PHY_OFFSET(0x48));
+	exynos_pcie_phy_writel(ep->base, 0x13, PCIE_PHY_OFFSET(0x54));
+	exynos_pcie_phy_writel(ep->base, 0x04, PCIE_PHY_OFFSET(0x31));
+	exynos_pcie_phy_writel(ep->base, 0, PCIE_PHY_OFFSET(0x32));
+
+	regmap_update_bits(ep->fsysreg, PCIE_EXYNOS5433_PHY_COMMON_RESET,
+			   PCIE_PHY_RESET, 0);
+	regmap_update_bits(ep->fsysreg, PCIE_EXYNOS5433_PHY_MAC_RESET,
+			   PCIE_MAC_RESET_MASK, PCIE_MAC_RESET);
 	return 0;
 }
 
-static int exynos5440_pcie_phy_power_on(struct phy *phy)
+static int exynos5433_pcie_phy_power_on(struct phy *phy)
 {
 	struct exynos_pcie_phy *ep = phy_get_drvdata(phy);
-	u32 val;
-
-	exynos_pcie_phy_writel(ep->blk_base, 0, PCIE_PHY_COMMON_RESET);
-	exynos_pcie_phy_writel(ep->blk_base, 0, PCIE_PHY_CMN_REG);
-	exynos_pcie_phy_writel(ep->blk_base, 0, PCIE_PHY_TRSVREG_RESET);
-	exynos_pcie_phy_writel(ep->blk_base, 0, PCIE_PHY_TRSV_RESET);
-
-	val = exynos_pcie_phy_readl(ep->phy_base, PCIE_PHY_COMMON_POWER);
-	val &= ~PCIE_PHY_COMMON_PD_CMN;
-	exynos_pcie_phy_writel(ep->phy_base, val, PCIE_PHY_COMMON_POWER);
-
-	val = exynos_pcie_phy_readl(ep->phy_base, PCIE_PHY_TRSV0_POWER);
-	val &= ~PCIE_PHY_TRSV0_PD_TSV;
-	exynos_pcie_phy_writel(ep->phy_base, val, PCIE_PHY_TRSV0_POWER);
-
-	val = exynos_pcie_phy_readl(ep->phy_base, PCIE_PHY_TRSV1_POWER);
-	val &= ~PCIE_PHY_TRSV1_PD_TSV;
-	exynos_pcie_phy_writel(ep->phy_base, val, PCIE_PHY_TRSV1_POWER);
-
-	val = exynos_pcie_phy_readl(ep->phy_base, PCIE_PHY_TRSV2_POWER);
-	val &= ~PCIE_PHY_TRSV2_PD_TSV;
-	exynos_pcie_phy_writel(ep->phy_base, val, PCIE_PHY_TRSV2_POWER);
-
-	val = exynos_pcie_phy_readl(ep->phy_base, PCIE_PHY_TRSV3_POWER);
-	val &= ~PCIE_PHY_TRSV3_PD_TSV;
-	exynos_pcie_phy_writel(ep->phy_base, val, PCIE_PHY_TRSV3_POWER);
 
+	regmap_update_bits(ep->pmureg, EXYNOS5433_PMU_PCIE_PHY_OFFSET,
+			   BIT(0), 1);
+	regmap_update_bits(ep->fsysreg, PCIE_EXYNOS5433_PHY_GLOBAL_RESET,
+			   PCIE_APP_REQ_EXIT_L1_MODE, 0);
+	regmap_update_bits(ep->fsysreg, PCIE_EXYNOS5433_PHY_L1SUB_CM_CON,
+			   PCIE_REFCLK_GATING_EN, 0);
 	return 0;
 }
 
-static int exynos5440_pcie_phy_power_off(struct phy *phy)
+static int exynos5433_pcie_phy_power_off(struct phy *phy)
 {
 	struct exynos_pcie_phy *ep = phy_get_drvdata(phy);
-	u32 val;
-
-	if (readl_poll_timeout(ep->phy_base + PCIE_PHY_PLL_LOCKED, val,
-				(val != 0), 1, 500)) {
-		dev_err(&phy->dev, "PLL Locked: 0x%x\n", val);
-		return -ETIMEDOUT;
-	}
-
-	val = exynos_pcie_phy_readl(ep->phy_base, PCIE_PHY_COMMON_POWER);
-	val |= PCIE_PHY_COMMON_PD_CMN;
-	exynos_pcie_phy_writel(ep->phy_base, val, PCIE_PHY_COMMON_POWER);
-
-	val = exynos_pcie_phy_readl(ep->phy_base, PCIE_PHY_TRSV0_POWER);
-	val |= PCIE_PHY_TRSV0_PD_TSV;
-	exynos_pcie_phy_writel(ep->phy_base, val, PCIE_PHY_TRSV0_POWER);
-
-	val = exynos_pcie_phy_readl(ep->phy_base, PCIE_PHY_TRSV1_POWER);
-	val |= PCIE_PHY_TRSV1_PD_TSV;
-	exynos_pcie_phy_writel(ep->phy_base, val, PCIE_PHY_TRSV1_POWER);
-
-	val = exynos_pcie_phy_readl(ep->phy_base, PCIE_PHY_TRSV2_POWER);
-	val |= PCIE_PHY_TRSV2_PD_TSV;
-	exynos_pcie_phy_writel(ep->phy_base, val, PCIE_PHY_TRSV2_POWER);
-
-	val = exynos_pcie_phy_readl(ep->phy_base, PCIE_PHY_TRSV3_POWER);
-	val |= PCIE_PHY_TRSV3_PD_TSV;
-	exynos_pcie_phy_writel(ep->phy_base, val, PCIE_PHY_TRSV3_POWER);
 
+	regmap_update_bits(ep->fsysreg, PCIE_EXYNOS5433_PHY_L1SUB_CM_CON,
+			   PCIE_REFCLK_GATING_EN, PCIE_REFCLK_GATING_EN);
+	regmap_update_bits(ep->pmureg, EXYNOS5433_PMU_PCIE_PHY_OFFSET,
+			   BIT(0), 0);
 	return 0;
 }
 
-static int exynos5440_pcie_phy_reset(struct phy *phy)
-{
-	struct exynos_pcie_phy *ep = phy_get_drvdata(phy);
-
-	exynos_pcie_phy_writel(ep->blk_base, 0, PCIE_PHY_MAC_RESET);
-	exynos_pcie_phy_writel(ep->blk_base, 1, PCIE_PHY_GLOBAL_RESET);
-	exynos_pcie_phy_writel(ep->blk_base, 0, PCIE_PHY_GLOBAL_RESET);
-
-	return 0;
-}
-
-static const struct phy_ops exynos5440_phy_ops = {
-	.init		= exynos5440_pcie_phy_init,
-	.power_on	= exynos5440_pcie_phy_power_on,
-	.power_off	= exynos5440_pcie_phy_power_off,
-	.reset		= exynos5440_pcie_phy_reset,
+static const struct phy_ops exynos5433_phy_ops = {
+	.init		= exynos5433_pcie_phy_init,
+	.power_on	= exynos5433_pcie_phy_power_on,
+	.power_off	= exynos5433_pcie_phy_power_off,
 	.owner		= THIS_MODULE,
 };
 
-static const struct exynos_pcie_phy_data exynos5440_pcie_phy_data = {
-	.ops		= &exynos5440_phy_ops,
-};
-
 static const struct of_device_id exynos_pcie_phy_match[] = {
 	{
-		.compatible = "samsung,exynos5440-pcie-phy",
-		.data = &exynos5440_pcie_phy_data,
+		.compatible = "samsung,exynos5433-pcie-phy",
 	},
 	{},
 };
@@ -232,30 +153,30 @@ static int exynos_pcie_phy_probe(struct platform_device *pdev)
 	struct exynos_pcie_phy *exynos_phy;
 	struct phy *generic_phy;
 	struct phy_provider *phy_provider;
-	struct resource *res;
-	const struct exynos_pcie_phy_data *drv_data;
-
-	drv_data = of_device_get_match_data(dev);
-	if (!drv_data)
-		return -ENODEV;
 
 	exynos_phy = devm_kzalloc(dev, sizeof(*exynos_phy), GFP_KERNEL);
 	if (!exynos_phy)
 		return -ENOMEM;
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	exynos_phy->phy_base = devm_ioremap_resource(dev, res);
-	if (IS_ERR(exynos_phy->phy_base))
-		return PTR_ERR(exynos_phy->phy_base);
+	exynos_phy->base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(exynos_phy->base))
+		return PTR_ERR(exynos_phy->base);
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
-	exynos_phy->blk_base = devm_ioremap_resource(dev, res);
-	if (IS_ERR(exynos_phy->blk_base))
-		return PTR_ERR(exynos_phy->blk_base);
+	exynos_phy->pmureg = syscon_regmap_lookup_by_phandle(dev->of_node,
+							"samsung,pmu-syscon");
+	if (IS_ERR(exynos_phy->pmureg)) {
+		dev_err(&pdev->dev, "PMU regmap lookup failed.\n");
+		return PTR_ERR(exynos_phy->pmureg);
+	}
 
-	exynos_phy->drv_data = drv_data;
+	exynos_phy->fsysreg = syscon_regmap_lookup_by_phandle(dev->of_node,
+							 "samsung,fsys-sysreg");
+	if (IS_ERR(exynos_phy->fsysreg)) {
+		dev_err(&pdev->dev, "FSYS sysreg regmap lookup failed.\n");
+		return PTR_ERR(exynos_phy->fsysreg);
+	}
 
-	generic_phy = devm_phy_create(dev, dev->of_node, drv_data->ops);
+	generic_phy = devm_phy_create(dev, dev->of_node, &exynos5433_phy_ops);
 	if (IS_ERR(generic_phy)) {
 		dev_err(dev, "failed to create PHY\n");
 		return PTR_ERR(generic_phy);
@@ -275,5 +196,4 @@ static struct platform_driver exynos_pcie_phy_driver = {
 		.suppress_bind_attrs = true,
 	}
 };
-
 builtin_platform_driver(exynos_pcie_phy_driver);
-- 
2.17.1

[PATCH v3 5/6] pci: dwc: pci-exynos: rework the driver to support Exynos5433 variant

[Marek Szyprowski]

From: Jaehoon Chung <jh80.chung@samsung.com>

Exynos5440 SoC support has been dropped since commit 8c83315da1cf ("ARM:
dts: exynos: Remove Exynos5440"). Rework this driver to support DWC PCIe
variant found in the Exynos5433 SoCs.

The main difference in Exynos5433 variant is lack of the MSI support
(the MSI interrupt is not even routed to the CPU).

Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
[mszyprow: reworked the driver to support only Exynos5433 variant,
	   simplified code, rebased onto current kernel code, added
	   regulator support, converted to the regular platform driver,
	   removed MSI related code, rewrote commit message, added help]
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Krzysztof Kozlowski <krzk@kernel.org>
---
 drivers/pci/controller/dwc/Kconfig      |  10 +-
 drivers/pci/controller/dwc/pci-exynos.c | 353 ++++++++++--------------
 drivers/pci/quirks.c                    |   1 +
 3 files changed, 147 insertions(+), 217 deletions(-)

diff --git a/drivers/pci/controller/dwc/Kconfig b/drivers/pci/controller/dwc/Kconfig
index bc049865f8e0..b0d41a80edfc 100644
--- a/drivers/pci/controller/dwc/Kconfig
+++ b/drivers/pci/controller/dwc/Kconfig
@@ -83,10 +83,14 @@ config PCIE_DW_PLAT_EP
 	  selected.
 
 config PCI_EXYNOS
-	bool "Samsung Exynos PCIe controller"
-	depends on SOC_EXYNOS5440 || COMPILE_TEST
-	depends on PCI_MSI_IRQ_DOMAIN
+	tristate "Samsung Exynos PCIe controller"
+	depends on ARCH_EXYNOS || COMPILE_TEST
 	select PCIE_DW_HOST
+	help
+	  Enables support for the PCIe controller in the Samsung Exynos SoCs
+	  to work in host mode. The PCI controller is based on the DesignWare
+	  hardware and therefore the driver re-uses the DesignWare core
+	  functions to implement the driver.
 
 config PCI_IMX6
 	bool "Freescale i.MX6/7/8 PCIe controller"
diff --git a/drivers/pci/controller/dwc/pci-exynos.c b/drivers/pci/controller/dwc/pci-exynos.c
index 5c10a5432896..c24dab383654 100644
--- a/drivers/pci/controller/dwc/pci-exynos.c
+++ b/drivers/pci/controller/dwc/pci-exynos.c
@@ -2,26 +2,23 @@
 /*
  * PCIe host controller driver for Samsung Exynos SoCs
  *
- * Copyright (C) 2013 Samsung Electronics Co., Ltd.
+ * Copyright (C) 2013-2020 Samsung Electronics Co., Ltd.
  *		https://www.samsung.com
  *
  * Author: Jingoo Han <jg1.han@samsung.com>
+ *	   Jaehoon Chung <jh80.chung@samsung.com>
  */
 
 #include <linux/clk.h>
 #include <linux/delay.h>
-#include <linux/gpio.h>
 #include <linux/interrupt.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/of_device.h>
-#include <linux/of_gpio.h>
 #include <linux/pci.h>
 #include <linux/platform_device.h>
 #include <linux/phy/phy.h>
-#include <linux/resource.h>
-#include <linux/signal.h>
-#include <linux/types.h>
+#include <linux/regulator/consumer.h>
 
 #include "pcie-designware.h"
 
@@ -37,102 +34,43 @@
 #define PCIE_IRQ_SPECIAL		0x008
 #define PCIE_IRQ_EN_PULSE		0x00c
 #define PCIE_IRQ_EN_LEVEL		0x010
-#define IRQ_MSI_ENABLE			BIT(2)
 #define PCIE_IRQ_EN_SPECIAL		0x014
-#define PCIE_PWR_RESET			0x018
+#define PCIE_SW_WAKE			0x018
+#define PCIE_BUS_EN			BIT(1)
 #define PCIE_CORE_RESET			0x01c
 #define PCIE_CORE_RESET_ENABLE		BIT(0)
 #define PCIE_STICKY_RESET		0x020
 #define PCIE_NONSTICKY_RESET		0x024
 #define PCIE_APP_INIT_RESET		0x028
 #define PCIE_APP_LTSSM_ENABLE		0x02c
-#define PCIE_ELBI_RDLH_LINKUP		0x064
+#define PCIE_ELBI_RDLH_LINKUP		0x074
+#define PCIE_ELBI_XMLH_LINKUP		BIT(4)
 #define PCIE_ELBI_LTSSM_ENABLE		0x1
 #define PCIE_ELBI_SLV_AWMISC		0x11c
 #define PCIE_ELBI_SLV_ARMISC		0x120
 #define PCIE_ELBI_SLV_DBI_ENABLE	BIT(21)
 
-struct exynos_pcie_mem_res {
-	void __iomem *elbi_base;   /* DT 0th resource: PCIe CTRL */
-};
-
-struct exynos_pcie_clk_res {
-	struct clk *clk;
-	struct clk *bus_clk;
-};
-
 struct exynos_pcie {
-	struct dw_pcie			*pci;
-	struct exynos_pcie_mem_res	*mem_res;
-	struct exynos_pcie_clk_res	*clk_res;
-	const struct exynos_pcie_ops	*ops;
-	int				reset_gpio;
-
+	struct dw_pcie			pci;
+	void __iomem			*elbi_base;
+	struct clk			*clk;
+	struct clk			*bus_clk;
 	struct phy			*phy;
+	struct regulator_bulk_data	supplies[2];
 };
 
-struct exynos_pcie_ops {
-	int (*get_mem_resources)(struct platform_device *pdev,
-			struct exynos_pcie *ep);
-	int (*get_clk_resources)(struct exynos_pcie *ep);
-	int (*init_clk_resources)(struct exynos_pcie *ep);
-	void (*deinit_clk_resources)(struct exynos_pcie *ep);
-};
-
-static int exynos5440_pcie_get_mem_resources(struct platform_device *pdev,
-					     struct exynos_pcie *ep)
-{
-	struct dw_pcie *pci = ep->pci;
-	struct device *dev = pci->dev;
-
-	ep->mem_res = devm_kzalloc(dev, sizeof(*ep->mem_res), GFP_KERNEL);
-	if (!ep->mem_res)
-		return -ENOMEM;
-
-	ep->mem_res->elbi_base = devm_platform_ioremap_resource(pdev, 0);
-	if (IS_ERR(ep->mem_res->elbi_base))
-		return PTR_ERR(ep->mem_res->elbi_base);
-
-	return 0;
-}
-
-static int exynos5440_pcie_get_clk_resources(struct exynos_pcie *ep)
+static int exynos_pcie_init_clk_resources(struct exynos_pcie *ep)
 {
-	struct dw_pcie *pci = ep->pci;
-	struct device *dev = pci->dev;
-
-	ep->clk_res = devm_kzalloc(dev, sizeof(*ep->clk_res), GFP_KERNEL);
-	if (!ep->clk_res)
-		return -ENOMEM;
-
-	ep->clk_res->clk = devm_clk_get(dev, "pcie");
-	if (IS_ERR(ep->clk_res->clk)) {
-		dev_err(dev, "Failed to get pcie rc clock\n");
-		return PTR_ERR(ep->clk_res->clk);
-	}
-
-	ep->clk_res->bus_clk = devm_clk_get(dev, "pcie_bus");
-	if (IS_ERR(ep->clk_res->bus_clk)) {
-		dev_err(dev, "Failed to get pcie bus clock\n");
-		return PTR_ERR(ep->clk_res->bus_clk);
-	}
-
-	return 0;
-}
-
-static int exynos5440_pcie_init_clk_resources(struct exynos_pcie *ep)
-{
-	struct dw_pcie *pci = ep->pci;
-	struct device *dev = pci->dev;
+	struct device *dev = ep->pci.dev;
 	int ret;
 
-	ret = clk_prepare_enable(ep->clk_res->clk);
+	ret = clk_prepare_enable(ep->clk);
 	if (ret) {
 		dev_err(dev, "cannot enable pcie rc clock");
 		return ret;
 	}
 
-	ret = clk_prepare_enable(ep->clk_res->bus_clk);
+	ret = clk_prepare_enable(ep->bus_clk);
 	if (ret) {
 		dev_err(dev, "cannot enable pcie bus clock");
 		goto err_bus_clk;
@@ -141,24 +79,17 @@ static int exynos5440_pcie_init_clk_resources(struct exynos_pcie *ep)
 	return 0;
 
 err_bus_clk:
-	clk_disable_unprepare(ep->clk_res->clk);
+	clk_disable_unprepare(ep->clk);
 
 	return ret;
 }
 
-static void exynos5440_pcie_deinit_clk_resources(struct exynos_pcie *ep)
+static void exynos_pcie_deinit_clk_resources(struct exynos_pcie *ep)
 {
-	clk_disable_unprepare(ep->clk_res->bus_clk);
-	clk_disable_unprepare(ep->clk_res->clk);
+	clk_disable_unprepare(ep->bus_clk);
+	clk_disable_unprepare(ep->clk);
 }
 
-static const struct exynos_pcie_ops exynos5440_pcie_ops = {
-	.get_mem_resources	= exynos5440_pcie_get_mem_resources,
-	.get_clk_resources	= exynos5440_pcie_get_clk_resources,
-	.init_clk_resources	= exynos5440_pcie_init_clk_resources,
-	.deinit_clk_resources	= exynos5440_pcie_deinit_clk_resources,
-};
-
 static void exynos_pcie_writel(void __iomem *base, u32 val, u32 reg)
 {
 	writel(val, base + reg);
@@ -173,94 +104,71 @@ static void exynos_pcie_sideband_dbi_w_mode(struct exynos_pcie *ep, bool on)
 {
 	u32 val;
 
-	val = exynos_pcie_readl(ep->mem_res->elbi_base, PCIE_ELBI_SLV_AWMISC);
+	val = exynos_pcie_readl(ep->elbi_base, PCIE_ELBI_SLV_AWMISC);
 	if (on)
 		val |= PCIE_ELBI_SLV_DBI_ENABLE;
 	else
 		val &= ~PCIE_ELBI_SLV_DBI_ENABLE;
-	exynos_pcie_writel(ep->mem_res->elbi_base, val, PCIE_ELBI_SLV_AWMISC);
+	exynos_pcie_writel(ep->elbi_base, val, PCIE_ELBI_SLV_AWMISC);
 }
 
 static void exynos_pcie_sideband_dbi_r_mode(struct exynos_pcie *ep, bool on)
 {
 	u32 val;
 
-	val = exynos_pcie_readl(ep->mem_res->elbi_base, PCIE_ELBI_SLV_ARMISC);
+	val = exynos_pcie_readl(ep->elbi_base, PCIE_ELBI_SLV_ARMISC);
 	if (on)
 		val |= PCIE_ELBI_SLV_DBI_ENABLE;
 	else
 		val &= ~PCIE_ELBI_SLV_DBI_ENABLE;
-	exynos_pcie_writel(ep->mem_res->elbi_base, val, PCIE_ELBI_SLV_ARMISC);
+	exynos_pcie_writel(ep->elbi_base, val, PCIE_ELBI_SLV_ARMISC);
 }
 
 static void exynos_pcie_assert_core_reset(struct exynos_pcie *ep)
 {
 	u32 val;
 
-	val = exynos_pcie_readl(ep->mem_res->elbi_base, PCIE_CORE_RESET);
+	val = exynos_pcie_readl(ep->elbi_base, PCIE_CORE_RESET);
 	val &= ~PCIE_CORE_RESET_ENABLE;
-	exynos_pcie_writel(ep->mem_res->elbi_base, val, PCIE_CORE_RESET);
-	exynos_pcie_writel(ep->mem_res->elbi_base, 0, PCIE_PWR_RESET);
-	exynos_pcie_writel(ep->mem_res->elbi_base, 0, PCIE_STICKY_RESET);
-	exynos_pcie_writel(ep->mem_res->elbi_base, 0, PCIE_NONSTICKY_RESET);
+	exynos_pcie_writel(ep->elbi_base, val, PCIE_CORE_RESET);
+	exynos_pcie_writel(ep->elbi_base, 0, PCIE_STICKY_RESET);
+	exynos_pcie_writel(ep->elbi_base, 0, PCIE_NONSTICKY_RESET);
 }
 
 static void exynos_pcie_deassert_core_reset(struct exynos_pcie *ep)
 {
 	u32 val;
 
-	val = exynos_pcie_readl(ep->mem_res->elbi_base, PCIE_CORE_RESET);
+	val = exynos_pcie_readl(ep->elbi_base, PCIE_CORE_RESET);
 	val |= PCIE_CORE_RESET_ENABLE;
 
-	exynos_pcie_writel(ep->mem_res->elbi_base, val, PCIE_CORE_RESET);
-	exynos_pcie_writel(ep->mem_res->elbi_base, 1, PCIE_STICKY_RESET);
-	exynos_pcie_writel(ep->mem_res->elbi_base, 1, PCIE_NONSTICKY_RESET);
-	exynos_pcie_writel(ep->mem_res->elbi_base, 1, PCIE_APP_INIT_RESET);
-	exynos_pcie_writel(ep->mem_res->elbi_base, 0, PCIE_APP_INIT_RESET);
-}
-
-static void exynos_pcie_assert_reset(struct exynos_pcie *ep)
-{
-	struct dw_pcie *pci = ep->pci;
-	struct device *dev = pci->dev;
-
-	if (ep->reset_gpio >= 0)
-		devm_gpio_request_one(dev, ep->reset_gpio,
-				GPIOF_OUT_INIT_HIGH, "RESET");
+	exynos_pcie_writel(ep->elbi_base, val, PCIE_CORE_RESET);
+	exynos_pcie_writel(ep->elbi_base, 1, PCIE_STICKY_RESET);
+	exynos_pcie_writel(ep->elbi_base, 1, PCIE_NONSTICKY_RESET);
+	exynos_pcie_writel(ep->elbi_base, 1, PCIE_APP_INIT_RESET);
+	exynos_pcie_writel(ep->elbi_base, 0, PCIE_APP_INIT_RESET);
 }
 
 static int exynos_pcie_start_link(struct dw_pcie *pci)
 {
 	struct exynos_pcie *ep = to_exynos_pcie(pci);
+	u32 val;
+
+	val = exynos_pcie_readl(ep->elbi_base, PCIE_SW_WAKE);
+	val &= ~PCIE_BUS_EN;
+	exynos_pcie_writel(ep->elbi_base, val, PCIE_SW_WAKE);
 
 	/* assert LTSSM enable */
-	exynos_pcie_writel(ep->mem_res->elbi_base, PCIE_ELBI_LTSSM_ENABLE,
+	exynos_pcie_writel(ep->elbi_base, PCIE_ELBI_LTSSM_ENABLE,
 			  PCIE_APP_LTSSM_ENABLE);
-
-	/* check if the link is up or not */
-	if (!dw_pcie_wait_for_link(pci))
-		return 0;
-
-	phy_power_off(ep->phy);
-	return -ETIMEDOUT;
+	return 0;
 }
 
 static void exynos_pcie_clear_irq_pulse(struct exynos_pcie *ep)
 {
-	u32 val;
-
-	val = exynos_pcie_readl(ep->mem_res->elbi_base, PCIE_IRQ_PULSE);
-	exynos_pcie_writel(ep->mem_res->elbi_base, val, PCIE_IRQ_PULSE);
-}
-
-static void exynos_pcie_enable_irq_pulse(struct exynos_pcie *ep)
-{
-	u32 val;
+	u32 val = exynos_pcie_readl(ep->elbi_base, PCIE_IRQ_PULSE);
 
-	/* enable INTX interrupt */
-	val = IRQ_INTA_ASSERT | IRQ_INTB_ASSERT |
-		IRQ_INTC_ASSERT | IRQ_INTD_ASSERT;
-	exynos_pcie_writel(ep->mem_res->elbi_base, val, PCIE_IRQ_EN_PULSE);
+	exynos_pcie_writel(ep->elbi_base, val, PCIE_IRQ_PULSE);
 }
 
 static irqreturn_t exynos_pcie_irq_handler(int irq, void *arg)
@@ -271,22 +179,14 @@ static irqreturn_t exynos_pcie_irq_handler(int irq, void *arg)
 	return IRQ_HANDLED;
 }
 
-static void exynos_pcie_msi_init(struct exynos_pcie *ep)
-{
-	u32 val;
-
-	/* enable MSI interrupt */
-	val = exynos_pcie_readl(ep->mem_res->elbi_base, PCIE_IRQ_EN_LEVEL);
-	val |= IRQ_MSI_ENABLE;
-	exynos_pcie_writel(ep->mem_res->elbi_base, val, PCIE_IRQ_EN_LEVEL);
-}
-
-static void exynos_pcie_enable_interrupts(struct exynos_pcie *ep)
+static void exynos_pcie_enable_irq_pulse(struct exynos_pcie *ep)
 {
-	exynos_pcie_enable_irq_pulse(ep);
+	u32 val = IRQ_INTA_ASSERT | IRQ_INTB_ASSERT |
+		  IRQ_INTC_ASSERT | IRQ_INTD_ASSERT;
 
-	if (IS_ENABLED(CONFIG_PCI_MSI))
-		exynos_pcie_msi_init(ep);
+	exynos_pcie_writel(ep->elbi_base, val, PCIE_IRQ_EN_PULSE);
+	exynos_pcie_writel(ep->elbi_base, 0, PCIE_IRQ_EN_LEVEL);
+	exynos_pcie_writel(ep->elbi_base, 0, PCIE_IRQ_EN_SPECIAL);
 }
 
 static u32 exynos_pcie_read_dbi(struct dw_pcie *pci, void __iomem *base,
@@ -345,13 +245,9 @@ static struct pci_ops exynos_pci_ops = {
 static int exynos_pcie_link_up(struct dw_pcie *pci)
 {
 	struct exynos_pcie *ep = to_exynos_pcie(pci);
-	u32 val;
+	u32 val = exynos_pcie_readl(ep->elbi_base, PCIE_ELBI_RDLH_LINKUP);
 
-	val = exynos_pcie_readl(ep->mem_res->elbi_base, PCIE_ELBI_RDLH_LINKUP);
-	if (val == PCIE_ELBI_LTSSM_ENABLE)
-		return 1;
-
-	return 0;
+	return (val & PCIE_ELBI_XMLH_LINKUP);
 }
 
 static int exynos_pcie_host_init(struct pcie_port *pp)
@@ -364,17 +260,11 @@ static int exynos_pcie_host_init(struct pcie_port *pp)
 	exynos_pcie_assert_core_reset(ep);
 
 	phy_reset(ep->phy);
-
-	exynos_pcie_writel(ep->mem_res->elbi_base, 1,
-			PCIE_PWR_RESET);
-
 	phy_power_on(ep->phy);
 	phy_init(ep->phy);
 
 	exynos_pcie_deassert_core_reset(ep);
-	exynos_pcie_assert_reset(ep);
-
-	exynos_pcie_enable_interrupts(ep);
+	exynos_pcie_enable_irq_pulse(ep);
 
 	return 0;
 }
@@ -383,26 +273,27 @@ static const struct dw_pcie_host_ops exynos_pcie_host_ops = {
 	.host_init = exynos_pcie_host_init,
 };
 
-static int __init exynos_add_pcie_port(struct exynos_pcie *ep,
+static int exynos_add_pcie_port(struct exynos_pcie *ep,
 				       struct platform_device *pdev)
 {
-	struct dw_pcie *pci = ep->pci;
+	struct dw_pcie *pci = &ep->pci;
 	struct pcie_port *pp = &pci->pp;
 	struct device *dev = &pdev->dev;
 	int ret;
 
-	pp->irq = platform_get_irq(pdev, 1);
+	pp->irq = platform_get_irq(pdev, 0);
 	if (pp->irq < 0)
 		return pp->irq;
 
 	ret = devm_request_irq(dev, pp->irq, exynos_pcie_irq_handler,
-				IRQF_SHARED, "exynos-pcie", ep);
+			       IRQF_SHARED, "exynos-pcie", ep);
 	if (ret) {
 		dev_err(dev, "failed to request irq\n");
 		return ret;
 	}
 
 	pp->ops = &exynos_pcie_host_ops;
+	pp->msi_irq = -ENODEV;
 
 	ret = dw_pcie_host_init(pp);
 	if (ret) {
@@ -420,10 +311,9 @@ static const struct dw_pcie_ops dw_pcie_ops = {
 	.start_link = exynos_pcie_start_link,
 };
 
-static int __init exynos_pcie_probe(struct platform_device *pdev)
+static int exynos_pcie_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
-	struct dw_pcie *pci;
 	struct exynos_pcie *ep;
 	struct device_node *np = dev->of_node;
 	int ret;
@@ -432,43 +322,45 @@ static int __init exynos_pcie_probe(struct platform_device *pdev)
 	if (!ep)
 		return -ENOMEM;
 
-	pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL);
-	if (!pci)
-		return -ENOMEM;
-
-	pci->dev = dev;
-	pci->ops = &dw_pcie_ops;
-
-	ep->pci = pci;
-	ep->ops = (const struct exynos_pcie_ops *)
-		of_device_get_match_data(dev);
-
-	ep->reset_gpio = of_get_named_gpio(np, "reset-gpio", 0);
+	ep->pci.dev = dev;
+	ep->pci.ops = &dw_pcie_ops;
 
 	ep->phy = devm_of_phy_get(dev, np, NULL);
-	if (IS_ERR(ep->phy)) {
-		if (PTR_ERR(ep->phy) != -ENODEV)
-			return PTR_ERR(ep->phy);
+	if (IS_ERR(ep->phy))
+		return PTR_ERR(ep->phy);
 
-		ep->phy = NULL;
-	}
+	/* External Local Bus interface (ELBI) registers */
+	ep->elbi_base = devm_platform_ioremap_resource_byname(pdev, "elbi");
+	if (IS_ERR(ep->elbi_base))
+		return PTR_ERR(ep->elbi_base);
 
-	if (ep->ops && ep->ops->get_mem_resources) {
-		ret = ep->ops->get_mem_resources(pdev, ep);
-		if (ret)
-			return ret;
+	ep->clk = devm_clk_get(dev, "pcie");
+	if (IS_ERR(ep->clk)) {
+		dev_err(dev, "Failed to get pcie rc clock\n");
+		return PTR_ERR(ep->clk);
 	}
 
-	if (ep->ops && ep->ops->get_clk_resources &&
-			ep->ops->init_clk_resources) {
-		ret = ep->ops->get_clk_resources(ep);
-		if (ret)
-			return ret;
-		ret = ep->ops->init_clk_resources(ep);
-		if (ret)
-			return ret;
+	ep->bus_clk = devm_clk_get(dev, "pcie_bus");
+	if (IS_ERR(ep->bus_clk)) {
+		dev_err(dev, "Failed to get pcie bus clock\n");
+		return PTR_ERR(ep->bus_clk);
 	}
 
+	ep->supplies[0].supply = "vdd18";
+	ep->supplies[1].supply = "vdd10";
+	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ep->supplies),
+				      ep->supplies);
+	if (ret)
+		return ret;
+
+	ret = exynos_pcie_init_clk_resources(ep);
+	if (ret)
+		return ret;
+
+	ret = regulator_bulk_enable(ARRAY_SIZE(ep->supplies), ep->supplies);
+	if (ret)
+		return ret;
+
 	platform_set_drvdata(pdev, ep);
 
 	ret = exynos_add_pcie_port(ep, pdev);
@@ -479,9 +371,9 @@ static int __init exynos_pcie_probe(struct platform_device *pdev)
 
 fail_probe:
 	phy_exit(ep->phy);
+	exynos_pcie_deinit_clk_resources(ep);
+	regulator_bulk_disable(ARRAY_SIZE(ep->supplies), ep->supplies);
 
-	if (ep->ops && ep->ops->deinit_clk_resources)
-		ep->ops->deinit_clk_resources(ep);
 	return ret;
 }
 
@@ -489,32 +381,65 @@ static int __exit exynos_pcie_remove(struct platform_device *pdev)
 {
 	struct exynos_pcie *ep = platform_get_drvdata(pdev);
 
-	if (ep->ops && ep->ops->deinit_clk_resources)
-		ep->ops->deinit_clk_resources(ep);
+	dw_pcie_host_deinit(&ep->pci.pp);
+	exynos_pcie_assert_core_reset(ep);
+	phy_power_off(ep->phy);
+	phy_exit(ep->phy);
+	exynos_pcie_deinit_clk_resources(ep);
+	regulator_bulk_disable(ARRAY_SIZE(ep->supplies), ep->supplies);
+
+	return 0;
+}
+
+static int __maybe_unused exynos_pcie_suspend_noirq(struct device *dev)
+{
+	struct exynos_pcie *ep = dev_get_drvdata(dev);
+
+	exynos_pcie_assert_core_reset(ep);
+	phy_power_off(ep->phy);
+	phy_exit(ep->phy);
+	regulator_bulk_disable(ARRAY_SIZE(ep->supplies), ep->supplies);
 
 	return 0;
 }
 
+static int __maybe_unused exynos_pcie_resume_noirq(struct device *dev)
+{
+	struct exynos_pcie *ep = dev_get_drvdata(dev);
+	struct dw_pcie *pci = &ep->pci;
+	struct pcie_port *pp = &pci->pp;
+	int ret;
+
+	ret = regulator_bulk_enable(ARRAY_SIZE(ep->supplies), ep->supplies);
+	if (ret)
+		return ret;
+
+	/* exynos_pcie_host_init controls ep->phy */
+	exynos_pcie_host_init(pp);
+	dw_pcie_setup_rc(pp);
+	exynos_pcie_start_link(pci);
+	return dw_pcie_wait_for_link(pci);
+}
+
+static const struct dev_pm_ops exynos_pcie_pm_ops = {
+	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(exynos_pcie_suspend_noirq,
+				      exynos_pcie_resume_noirq)
+};
+
 static const struct of_device_id exynos_pcie_of_match[] = {
-	{
-		.compatible = "samsung,exynos5440-pcie",
-		.data = &exynos5440_pcie_ops
-	},
-	{},
+	{ .compatible = "samsung,exynos5433-pcie", },
+	{ },
 };
 
 static struct platform_driver exynos_pcie_driver = {
+	.probe		= exynos_pcie_probe,
 	.remove		= __exit_p(exynos_pcie_remove),
 	.driver = {
 		.name	= "exynos-pcie",
 		.of_match_table = exynos_pcie_of_match,
+		.pm		= &exynos_pcie_pm_ops,
 	},
 };
-
-/* Exynos PCIe driver does not allow module unload */
-
-static int __init exynos_pcie_init(void)
-{
-	return platform_driver_probe(&exynos_pcie_driver, exynos_pcie_probe);
-}
-subsys_initcall(exynos_pcie_init);
+module_platform_driver(exynos_pcie_driver);
+MODULE_LICENSE("GPL v2");
+MODULE_DEVICE_TABLE(of, exynos_pcie_of_match);
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index f70692ac79c5..8b93f0bba1f2 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -2522,6 +2522,7 @@ DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_VT3351, quirk_disab
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_VT3364, quirk_disable_all_msi);
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8380_0, quirk_disable_all_msi);
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_SI, 0x0761, quirk_disable_all_msi);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_SAMSUNG, 0xa5e3, quirk_disable_all_msi);
 
 /* Disable MSI on chipsets that are known to not support it */
 static void quirk_disable_msi(struct pci_dev *dev)
-- 
2.17.1

[PATCH v3 6/6] arm64: dts: exynos: add the WiFi/PCIe support to TM2(e) boards

[Marek Szyprowski]

From: Jaehoon Chung <jh80.chung@samsung.com>

Add the nodes relevant to PCIe PHY and PCIe support. PCIe is used for the
WiFi interface (Broadcom Limited BCM4358 802.11ac Wireless LAN SoC).

Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
[mszyprow: rewrote commit message, reworked board/generic dts/dtsi split]
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
---
 .../boot/dts/exynos/exynos5433-pinctrl.dtsi   |  2 +-
 .../dts/exynos/exynos5433-tm2-common.dtsi     | 24 ++++++++++++-
 arch/arm64/boot/dts/exynos/exynos5433.dtsi    | 36 +++++++++++++++++++
 3 files changed, 60 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/boot/dts/exynos/exynos5433-pinctrl.dtsi b/arch/arm64/boot/dts/exynos/exynos5433-pinctrl.dtsi
index 9df7c65593a1..32a6518517e5 100644
--- a/arch/arm64/boot/dts/exynos/exynos5433-pinctrl.dtsi
+++ b/arch/arm64/boot/dts/exynos/exynos5433-pinctrl.dtsi
@@ -329,7 +329,7 @@
 	};
 
 	pcie_bus: pcie_bus {
-		samsung,pins = "gpr3-4", "gpr3-5", "gpr3-6", "gpr3-7";
+		samsung,pins = "gpr3-4", "gpr3-5", "gpr3-6";
 		samsung,pin-function = <EXYNOS_PIN_FUNC_3>;
 		samsung,pin-pud = <EXYNOS_PIN_PULL_UP>;
 	};
diff --git a/arch/arm64/boot/dts/exynos/exynos5433-tm2-common.dtsi b/arch/arm64/boot/dts/exynos/exynos5433-tm2-common.dtsi
index 97a2f0c7c0cf..5ec447f0cf5d 100644
--- a/arch/arm64/boot/dts/exynos/exynos5433-tm2-common.dtsi
+++ b/arch/arm64/boot/dts/exynos/exynos5433-tm2-common.dtsi
@@ -968,6 +968,25 @@
 	bus-width = <4>;
 };
 
+&pcie {
+	status = "okay";
+	pinctrl-names = "default";
+	pinctrl-0 = <&pcie_bus &pcie_wlanen>;
+	vdd10-supply = <&ldo6_reg>;
+	vdd18-supply = <&ldo7_reg>;
+	assigned-clocks = <&cmu_fsys CLK_MOUT_SCLK_PCIE_100_USER>,
+			  <&cmu_top CLK_MOUT_SCLK_PCIE_100>;
+	assigned-clock-parents = <&cmu_top CLK_SCLK_PCIE_100_FSYS>,
+				 <&cmu_top CLK_MOUT_BUS_PLL_USER>;
+	assigned-clock-rates = <0>, <100000000>;
+	interrupt-map-mask = <0 0 0 0>;
+	interrupt-map = <0 0 0 0 &gic GIC_SPI 245 IRQ_TYPE_LEVEL_HIGH>;
+};
+
+&pcie_phy {
+	status = "okay";
+};
+
 &ppmu_d0_general {
 	status = "okay";
 	events {
@@ -1084,8 +1103,11 @@
 	pinctrl-names = "default";
 	pinctrl-0 = <&initial_ese>;
 
+	pcie_wlanen: pcie-wlanen {
+		PIN(INPUT, gpj2-0, UP, FAST_SR4);
+	};
+
 	initial_ese: initial-state {
-		PIN(INPUT, gpj2-0, DOWN, FAST_SR1);
 		PIN(INPUT, gpj2-1, DOWN, FAST_SR1);
 		PIN(INPUT, gpj2-2, DOWN, FAST_SR1);
 	};
diff --git a/arch/arm64/boot/dts/exynos/exynos5433.dtsi b/arch/arm64/boot/dts/exynos/exynos5433.dtsi
index 0a886bb6c806..1d2442ac432c 100644
--- a/arch/arm64/boot/dts/exynos/exynos5433.dtsi
+++ b/arch/arm64/boot/dts/exynos/exynos5433.dtsi
@@ -1029,6 +1029,11 @@
 			reg = <0x145f0000 0x1038>;
 		};
 
+		syscon_fsys: syscon@156f0000 {
+			compatible = "syscon";
+			reg = <0x156f0000 0x1044>;
+		};
+
 		gsc_0: video-scaler@13c00000 {
 			compatible = "samsung,exynos5433-gsc";
 			reg = <0x13c00000 0x1000>;
@@ -1830,6 +1835,37 @@
 				status = "disabled";
 			};
 		};
+
+		pcie_phy: pcie-phy@15680000 {
+			compatible = "samsung,exynos5433-pcie-phy";
+			reg = <0x15680000 0x1000>;
+			samsung,pmu-syscon = <&pmu_system_controller>;
+			samsung,fsys-sysreg = <&syscon_fsys>;
+			#phy-cells = <0>;
+			status = "disabled";
+		};
+
+		pcie: pcie@15700000 {
+			compatible = "samsung,exynos5433-pcie";
+			reg = <0x15700000 0x1000>, <0x156b0000 0x1000>,
+			      <0x0c000000 0x1000>;
+			reg-names = "dbi", "elbi", "config";
+			#address-cells = <3>;
+			#size-cells = <2>;
+			#interrupt-cells = <1>;
+			device_type = "pci";
+			interrupts = <GIC_SPI 245 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&cmu_fsys CLK_PCIE>,
+			         <&cmu_fsys CLK_PCLK_PCIE_PHY>;
+			clock-names = "pcie", "pcie_bus";
+			num-lanes = <1>;
+			num-viewport = <3>;
+			bus-range = <0x00 0xff>;
+			phys = <&pcie_phy>;
+			ranges = <0x81000000 0 0	  0x0c001000 0 0x00010000>,
+				 <0x82000000 0 0x0c011000 0x0c011000 0 0x03feefff>;
+			status = "disabled";
+		};
 	};
 
 	timer: timer {
-- 
2.17.1

Re: [PATCH v3 5/6] pci: dwc: pci-exynos: rework the driver to support Exynos5433 variant

[Jingoo Han]

On 10/29/20, 9:41 AM, Marek Szyprowski wrote:
> 
> From: Jaehoon Chung <jh80.chung@samsung.com>
>
> Exynos5440 SoC support has been dropped since commit 8c83315da1cf ("ARM:
> dts: exynos: Remove Exynos5440"). Rework this driver to support DWC PCIe
> variant found in the Exynos5433 SoCs.
>
> The main difference in Exynos5433 variant is lack of the MSI support
> (the MSI interrupt is not even routed to the CPU).
>
> Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
> [mszyprow: reworked the driver to support only Exynos5433 variant,
>	   simplified code, rebased onto current kernel code, added
>	   regulator support, converted to the regular platform driver,
>	   removed MSI related code, rewrote commit message, added help]
> Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
> Acked-by: Krzysztof Kozlowski <krzk@kernel.org>

Acked-by: Jingoo Han <jingoohan1@gmail.com>

Best regards,
Jingoo Han

> ---
>  drivers/pci/controller/dwc/Kconfig      |  10 +-
>  drivers/pci/controller/dwc/pci-exynos.c | 353 ++++++++++--------------
>  drivers/pci/quirks.c                    |   1 +
>  3 files changed, 147 insertions(+), 217 deletions(-)

[...]

Re: [PATCH v3 0/6] Add DW PCIe support for Exynos5433 SoCs

[Bjorn Helgaas]

On Thu, Oct 29, 2020 at 02:40:11PM +0100, Marek Szyprowski wrote:
> Dear All,
> 
> This patchset is a resurrection of the DW PCIe support for the Exynos5433
> SoCs posted long time ago here: https://lkml.org/lkml/2016/12/26/6 and
> later here: https://lkml.org/lkml/2017/12/21/296 .
> 
> In meantime the support for the Exynos5440 SoCs has been completely
> dropped from mainline kernel, as those SoCs never reached the market. The
> PCIe driver for Exynos5440 variant however has not been removed yet. This
> patchset simply reworks it to support the Exynos5433 variant. The lack of
> the need to support both variants significantly simplifies the driver
> code.
> 
> This patchset is based on the following branch:
> git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git pci-more-dwc-cleanup
> 
> Best regards,
> Marek Szyprowski
> 
> 
> Changelog:
> 
> v3:
> - rebased onto "[00/13] PCI: dwc: Another round of clean-ups" patchset:
>   https://patchwork.kernel.org/project/linux-samsung-soc/cover/20201028204646.356535-1-robh@kernel.org/
> - fixed issues pointed by Rob in the driver logic:
>   * removed DBI_RO_WR_EN register poking
>   * made driver a standard module
> - fixed section mismatch issue
> - added "num-viewport = <3>" property to dts and bindings to fix warning
> 
> v2: https://lore.kernel.org/linux-samsung-soc/20201023075744.26200-1-m.szyprowski@samsung.com/
> - fixed issues in dt-bindings pointed by Krzysztof and Rob
> 
> v1: https://lore.kernel.org/linux-samsung-soc/20201019094715.15343-1-m.szyprowski@samsung.com/
> - initial version of this resurrected patchset
> 
> 
> Patch summary:

Please follow the subject line convention:

  PCI: exynos: Rework to support Exynos5433 variant
  arm64: dts: exynos: Add WiFi/PCIe support to TM2(e) boards
  dt-bindings: PCI: exynos: Drop samsung,exynos5440-pcie binding
  dt-bindings: PCI: exynos: Add samsung,exynos-pcie binding
  dt-bindings: phy: exynos: Add samsung,exynos-pcie-phy binding

You can save this trouble by running "git log --oneline" on the file
(or directory, for new files) and copying the style.

> Jaehoon Chung (3):
>   phy: samsung: phy-exynos-pcie: rework driver to support Exynos5433
>     PCIe PHY
>   pci: dwc: pci-exynos: rework the driver to support Exynos5433 variant
>   arm64: dts: exynos: add the WiFi/PCIe support to TM2(e) boards
> 
> Marek Szyprowski (3):
>   dt-bindings: pci: drop samsung,exynos5440-pcie binding
>   dt-bindings: pci: add the samsung,exynos-pcie binding
>   dt-bindings: phy: add the samsung,exynos-pcie-phy binding
> 
>  .../bindings/pci/samsung,exynos-pcie.yaml     | 119 ++++++
>  .../bindings/pci/samsung,exynos5440-pcie.txt  |  58 ---
>  .../bindings/phy/samsung,exynos-pcie-phy.yaml |  51 +++
>  .../boot/dts/exynos/exynos5433-pinctrl.dtsi   |   2 +-
>  .../dts/exynos/exynos5433-tm2-common.dtsi     |  24 +-
>  arch/arm64/boot/dts/exynos/exynos5433.dtsi    |  36 ++
>  drivers/pci/controller/dwc/Kconfig            |  10 +-
>  drivers/pci/controller/dwc/pci-exynos.c       | 353 +++++++-----------
>  drivers/pci/quirks.c                          |   1 +
>  drivers/phy/samsung/phy-exynos-pcie.c         | 304 ++++++---------
>  10 files changed, 489 insertions(+), 469 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/pci/samsung,exynos-pcie.yaml
>  delete mode 100644 Documentation/devicetree/bindings/pci/samsung,exynos5440-pcie.txt
>  create mode 100644 Documentation/devicetree/bindings/phy/samsung,exynos-pcie-phy.yaml
> 
> -- 
> 2.17.1
> 

Re: [PATCH v3 2/6] dt-bindings: pci: add the samsung,exynos-pcie binding

[Rob Herring]

On Thu, Oct 29, 2020 at 02:40:13PM +0100, Marek Szyprowski wrote:
> Add dt-bindings for the Samsung Exynos PCIe controller (Exynos5433
> variant). Based on the text dt-binding posted by Jaehoon Chung.
> 
> Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
> Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
> ---
>  .../bindings/pci/samsung,exynos-pcie.yaml     | 119 ++++++++++++++++++
>  1 file changed, 119 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/pci/samsung,exynos-pcie.yaml
> 
> diff --git a/Documentation/devicetree/bindings/pci/samsung,exynos-pcie.yaml b/Documentation/devicetree/bindings/pci/samsung,exynos-pcie.yaml
> new file mode 100644
> index 000000000000..1810bf722350
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pci/samsung,exynos-pcie.yaml
> @@ -0,0 +1,119 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/pci/samsung,exynos-pcie.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Samsung SoC series PCIe Host Controller Device Tree Bindings
> +
> +maintainers:
> +  - Marek Szyprowski <m.szyprowski@samsung.com>
> +  - Jaehoon Chung <jh80.chung@samsung.com>
> +
> +description: |+
> +  Exynos5433 SoC PCIe host controller is based on the Synopsys DesignWare
> +  PCIe IP and thus inherits all the common properties defined in
> +  designware-pcie.txt.
> +
> +allOf:
> +  - $ref: /schemas/pci/pci-bus.yaml#
> +
> +properties:
> +  compatible:
> +    const: samsung,exynos5433-pcie
> +
> +  reg:
> +    items:
> +      - description: Data Bus Interface (DBI) registers.
> +      - description: External Local Bus interface (ELBI) registers.
> +      - description: PCIe configuration space region.
> +
> +  reg-names:
> +    items:
> +      - const: dbi
> +      - const: elbi
> +      - const: config
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  clocks:
> +    items:
> +      - description: PCIe bridge clock
> +      - description: PCIe bus clock
> +
> +  clock-names:
> +    items:
> +      - const: pcie
> +      - const: pcie_bus
> +
> +  phys:
> +    maxItems: 1
> +
> +  vdd10-supply:
> +    description:
> +      Phandle to a regulator that provides 1.0V power to the PCIe block.
> +
> +  vdd18-supply:
> +    description:
> +      Phandle to a regulator that provides 1.8V power to the PCIe block.
> +
> +  num-lanes:
> +    const: 1
> +
> +  num-viewport:
> +    const: 3

I'm confused why you need this. This is only used with the iATU except 
for keystone. Platforms like Exynos with their own child bus config 
space accessors don't have an iATU. 

BTW, for cases with an iATU, I'm working on making the number of 
viewports runtime detected.

> +
> +required:
> +  - reg
> +  - reg-names
> +  - interrupts
> +  - "#address-cells"
> +  - "#size-cells"
> +  - "#interrupt-cells"
> +  - interrupt-map
> +  - interrupt-map-mask
> +  - ranges
> +  - bus-range
> +  - device_type
> +  - num-lanes
> +  - num-viewport
> +  - clocks
> +  - clock-names
> +  - phys
> +  - vdd10-supply
> +  - vdd18-supply
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +    #include <dt-bindings/clock/exynos5433.h>
> +
> +    pcie: pcie@15700000 {
> +        compatible = "samsung,exynos5433-pcie";
> +        reg = <0x15700000 0x1000>, <0x156b0000 0x1000>, <0x0c000000 0x1000>;
> +        reg-names = "dbi", "elbi", "config";
> +        #address-cells = <3>;
> +        #size-cells = <2>;
> +        #interrupt-cells = <1>;
> +        device_type = "pci";
> +        interrupts = <GIC_SPI 245 IRQ_TYPE_LEVEL_HIGH>;
> +        clocks = <&cmu_fsys CLK_PCIE>, <&cmu_fsys CLK_PCLK_PCIE_PHY>;
> +        clock-names = "pcie", "pcie_bus";
> +        phys = <&pcie_phy>;
> +        pinctrl-0 = <&pcie_bus &pcie_wlanen>;
> +        pinctrl-names = "default";
> +        num-lanes = <1>;
> +        num-viewport = <3>;
> +        bus-range = <0x00 0xff>;
> +        ranges = <0x81000000 0 0	  0x0c001000 0 0x00010000>,
> +                 <0x82000000 0 0x0c011000 0x0c011000 0 0x03feefff>;
> +        vdd10-supply = <&ldo6_reg>;
> +        vdd18-supply = <&ldo7_reg>;
> +        interrupt-map-mask = <0 0 0 0>;
> +        interrupt-map = <0 0 0 0 &gic GIC_SPI 245 IRQ_TYPE_LEVEL_HIGH>;
> +    };
> +...
> -- 
> 2.17.1
> 

Re: [PATCH v3 5/6] pci: dwc: pci-exynos: rework the driver to support Exynos5433 variant

[Rob Herring]

On Thu, Oct 29, 2020 at 02:40:16PM +0100, Marek Szyprowski wrote:
> From: Jaehoon Chung <jh80.chung@samsung.com>
> 
> Exynos5440 SoC support has been dropped since commit 8c83315da1cf ("ARM:
> dts: exynos: Remove Exynos5440"). Rework this driver to support DWC PCIe
> variant found in the Exynos5433 SoCs.
> 
> The main difference in Exynos5433 variant is lack of the MSI support
> (the MSI interrupt is not even routed to the CPU).
> 
> Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
> [mszyprow: reworked the driver to support only Exynos5433 variant,
> 	   simplified code, rebased onto current kernel code, added
> 	   regulator support, converted to the regular platform driver,
> 	   removed MSI related code, rewrote commit message, added help]
> Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
> Acked-by: Krzysztof Kozlowski <krzk@kernel.org>
> ---
>  drivers/pci/controller/dwc/Kconfig      |  10 +-
>  drivers/pci/controller/dwc/pci-exynos.c | 353 ++++++++++--------------
>  drivers/pci/quirks.c                    |   1 +
>  3 files changed, 147 insertions(+), 217 deletions(-)

Reviewed-by: Rob Herring <robh@kernel.org>

Re: [PATCH v3 3/6] dt-bindings: phy: add the samsung,exynos-pcie-phy binding

[Rob Herring]

On Thu, 29 Oct 2020 14:40:14 +0100, Marek Szyprowski wrote:
> Add dt-bindings for the Samsung Exynos PCIe PHY controller (Exynos5433
> variant). Based on the text dt-binding posted by Jaehoon Chung.
> 
> Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
> Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
> ---
>  .../bindings/phy/samsung,exynos-pcie-phy.yaml | 51 +++++++++++++++++++
>  1 file changed, 51 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/phy/samsung,exynos-pcie-phy.yaml
> 

Reviewed-by: Rob Herring <robh@kernel.org>

Re: [PATCH v3 2/6] dt-bindings: pci: add the samsung,exynos-pcie binding

[Marek Szyprowski]

Hi Rob,

On 04.11.2020 22:35, Rob Herring wrote:
> On Thu, Oct 29, 2020 at 02:40:13PM +0100, Marek Szyprowski wrote:
>> Add dt-bindings for the Samsung Exynos PCIe controller (Exynos5433
>> variant). Based on the text dt-binding posted by Jaehoon Chung.
>>
>> Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
>> Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
>> ---
>>   .../bindings/pci/samsung,exynos-pcie.yaml     | 119 ++++++++++++++++++
>>   1 file changed, 119 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/pci/samsung,exynos-pcie.yaml

>> ...

>> +  num-viewport:
>> +    const: 3
> I'm confused why you need this. This is only used with the iATU except
> for keystone. Platforms like Exynos with their own child bus config
> space accessors don't have an iATU.

Frankly I have no idea, I don't know much about the PCI internals. After 
rebasing onto your latest DW PCI changes I've noticed a following 
warning message:

exynos-pcie 15700000.pcie: Resources exceed number of ATU entries (2)

Here is a complete log:

# dmesg | grep pci
ehci-pci: EHCI PCI platform driver
ohci-pci: OHCI PCI platform driver
exynos-pcie 15700000.pcie: host bridge /soc@0/pcie@15700000 ranges:
exynos-pcie 15700000.pcie:       IO 0x000c001000..0x000c010fff -> 
0x0000000000
exynos-pcie 15700000.pcie:      MEM 0x000c011000..0x000ffffffe -> 
0x000c011000
exynos-pcie 15700000.pcie: Resources exceed number of ATU entries (2)
exynos-pcie 15700000.pcie: Link up
exynos-pcie 15700000.pcie: PCI host bridge to bus 0000:00
pci_bus 0000:00: root bus resource [bus 00-ff]
pci_bus 0000:00: root bus resource [io  0x0000-0xffff]
pci_bus 0000:00: root bus resource [mem 0x0c011000-0x0ffffffe]
pci 0000:00:00.0: [144d:a5e3] type 01 class 0x060400
pci 0000:00:00.0: PME# supported from D0 D3hot D3cold
pci 0000:01:00.0: [14e4:43e9] type 00 class 0x028000
pci 0000:01:00.0: reg 0x10: [mem 0x00000000-0x00007fff 64bit]
pci 0000:01:00.0: reg 0x18: [mem 0x00000000-0x003fffff 64bit]
pci 0000:01:00.0: supports D1 D2
pci 0000:01:00.0: PME# supported from D0 D1 D2 D3hot D3cold
pci 0000:00:00.0: BAR 14: assigned [mem 0x0c200000-0x0c7fffff]
pci 0000:01:00.0: BAR 2: assigned [mem 0x0c400000-0x0c7fffff 64bit]
pci 0000:01:00.0: BAR 0: assigned [mem 0x0c200000-0x0c207fff 64bit]
pci 0000:00:00.0: PCI bridge to [bus 01-ff]
pci 0000:00:00.0:   bridge window [mem 0x0c200000-0x0c7fffff]
pci 0000:00:00.0: MSI quirk detected; MSI disabled
pcieport 0000:00:00.0: PME: Signaling with IRQ 97
brcmfmac: brcmf_fw_alloc_request: using brcm/brcmfmac4358-pcie for chip 
BCM4358/1

When I've increased the numer of viewports it has gone.

If this is not the proper solution, I will removed it.

Best regards

-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland

Re: [PATCH v3 2/6] dt-bindings: pci: add the samsung,exynos-pcie binding

[Rob Herring]

On Thu, Nov 5, 2020 at 2:33 AM Marek Szyprowski
<m.szyprowski@samsung.com> wrote:
>
> Hi Rob,
>
> On 04.11.2020 22:35, Rob Herring wrote:
> > On Thu, Oct 29, 2020 at 02:40:13PM +0100, Marek Szyprowski wrote:
> >> Add dt-bindings for the Samsung Exynos PCIe controller (Exynos5433
> >> variant). Based on the text dt-binding posted by Jaehoon Chung.
> >>
> >> Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
> >> Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
> >> ---
> >>   .../bindings/pci/samsung,exynos-pcie.yaml     | 119 ++++++++++++++++++
> >>   1 file changed, 119 insertions(+)
> >>   create mode 100644 Documentation/devicetree/bindings/pci/samsung,exynos-pcie.yaml
>
> >> ...
>
> >> +  num-viewport:
> >> +    const: 3
> > I'm confused why you need this. This is only used with the iATU except
> > for keystone. Platforms like Exynos with their own child bus config
> > space accessors don't have an iATU.
>
> Frankly I have no idea, I don't know much about the PCI internals.

Sorry, I was confused. It's fine.

Reviewed-by: Rob Herring <robh@kernel.org>

Rob

Re: [PATCH v3 2/6] dt-bindings: pci: add the samsung,exynos-pcie binding

[Jingoo Han]

On 11/5/20, 10:27 AM, Rob Herring wrote:
> 
> On Thu, Nov 5, 2020 at 2:33 AM Marek Szyprowski
> <m.szyprowski@samsung.com> wrote:
> >
> > Hi Rob,
> >
> > On 04.11.2020 22:35, Rob Herring wrote:
> > > On Thu, Oct 29, 2020 at 02:40:13PM +0100, Marek Szyprowski wrote:
> > >> Add dt-bindings for the Samsung Exynos PCIe controller (Exynos5433
> > >> variant). Based on the text dt-binding posted by Jaehoon Chung.
> > >>
> > >> Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
> > >> Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
> > >> ---
> > >>   .../bindings/pci/samsung,exynos-pcie.yaml     | 119 ++++++++++++++++++
> > >>   1 file changed, 119 insertions(+)
> > >>   create mode 100644 Documentation/devicetree/bindings/pci/samsung,exynos-pcie.yaml
> >
> > >> ...
> >
> > >> +  num-viewport:
> > >> +    const: 3
> > > I'm confused why you need this. This is only used with the iATU except
> > > for keystone. Platforms like Exynos with their own child bus config
> > > space accessors don't have an iATU.
> >
> > Frankly I have no idea, I don't know much about the PCI internals.
>
> Sorry, I was confused. It's fine.

I was confused, too. But, as far as I remember, I also think that viewpoint-related
setting was necessary for Exynos PCIe.
Thank you.

Best regards,
Jingoo Han

>
> Reviewed-by: Rob Herring <robh@kernel.org>
>
> Rob

Re: [PATCH v3 6/6] arm64: dts: exynos: add the WiFi/PCIe support to TM2(e) boards

[Krzysztof Kozlowski]

On Thu, Oct 29, 2020 at 02:40:17PM +0100, Marek Szyprowski wrote:
> From: Jaehoon Chung <jh80.chung@samsung.com>
> 
> Add the nodes relevant to PCIe PHY and PCIe support. PCIe is used for the
> WiFi interface (Broadcom Limited BCM4358 802.11ac Wireless LAN SoC).
> 
> Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
> [mszyprow: rewrote commit message, reworked board/generic dts/dtsi split]
> Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
> ---
>  .../boot/dts/exynos/exynos5433-pinctrl.dtsi   |  2 +-
>  .../dts/exynos/exynos5433-tm2-common.dtsi     | 24 ++++++++++++-
>  arch/arm64/boot/dts/exynos/exynos5433.dtsi    | 36 +++++++++++++++++++

Thanks, applied.

Best regards,
Krzysztof