[PATCH V3 0/6] Enable IPQ5018 PCI support

[PATCH V3 0/6] Enable IPQ5018 PCI support

[Sricharan R]

From: Sricharan Ramabadhran <quic_srichara@quicinc.com>

This patch series adds the relevant phy and controller
DT configurations for enabling PCI gen2 support
on IPQ5018.

v3:
  Added Reviewed-by tag for patch#1.
  Fixed dev_err_probe usage in patch#3.
  Added pinctrl/wak pins for pcie1 in patch#6.

v2:
  Fixed all review comments from Krzysztof, Robert Marko,
  Dmitry Baryshkov, Manivannan Sadhasivam, Konrad Dybcio.
  Updated the respective patches for their changes.

v1:
 https://lore.kernel.org/lkml/32389b66-48f3-8ee8-e2f1-1613feed3cc7@gmail.com/T/

Nitheesh Sekar (5):
  dt-bindings: phy: qcom,uniphy-pcie: Document PCIe uniphy
  dt-bindings: PCI: qcom: Add IPQ5108 SoC
  phy: qcom: Introduce PCIe UNIPHY 28LP driver
  arm64: dts: qcom: ipq5018: Add PCIe related nodes
  arm64: dts: qcom: ipq5018: Enable PCIe

Sricharan R (1):
  PCI: qcom: Add support for IPQ5018

 .../devicetree/bindings/pci/qcom,pcie.yaml    |  35 ++
 .../phy/qcom,ipq5018-uniphy-pcie.yaml         |  70 ++++
 .../arm64/boot/dts/qcom/ipq5018-rdp432-c2.dts |  37 ++
 arch/arm64/boot/dts/qcom/ipq5018.dtsi         | 168 ++++++++-
 drivers/pci/controller/dwc/pcie-qcom.c        |   1 +
 drivers/phy/qualcomm/Kconfig                  |  12 +
 drivers/phy/qualcomm/Makefile                 |   1 +
 .../phy/qualcomm/phy-qcom-uniphy-pcie-28lp.c  | 346 ++++++++++++++++++
 8 files changed, 668 insertions(+), 2 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/phy/qcom,ipq5018-uniphy-pcie.yaml
 create mode 100644 drivers/phy/qualcomm/phy-qcom-uniphy-pcie-28lp.c

-- 
2.34.1

[PATCH V3 1/6] dt-bindings: phy: qcom,uniphy-pcie: Document PCIe uniphy

[Sricharan R]

From: Nitheesh Sekar <quic_nsekar@quicinc.com>

Document the Qualcomm UNIPHY PCIe 28LP present in IPQ5018.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Nitheesh Sekar <quic_nsekar@quicinc.com>
Signed-off-by: Sricharan Ramabadhran <quic_srichara@quicinc.com>
---
 [v3] Added reviewed-by tags

 .../phy/qcom,ipq5018-uniphy-pcie.yaml         | 70 +++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/phy/qcom,ipq5018-uniphy-pcie.yaml

diff --git a/Documentation/devicetree/bindings/phy/qcom,ipq5018-uniphy-pcie.yaml b/Documentation/devicetree/bindings/phy/qcom,ipq5018-uniphy-pcie.yaml
new file mode 100644
index 000000000000..c04dd179eb8b
--- /dev/null
+++ b/Documentation/devicetree/bindings/phy/qcom,ipq5018-uniphy-pcie.yaml
@@ -0,0 +1,70 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/phy/qcom,ipq5018-uniphy-pcie.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Qualcomm UNIPHY PCIe 28LP PHY controller for genx1, genx2
+
+maintainers:
+  - Nitheesh Sekar <quic_nsekar@quicinc.com>
+  - Sricharan Ramabadhran <quic_srichara@quicinc.com>
+
+properties:
+  compatible:
+    enum:
+      - qcom,ipq5018-uniphy-pcie-gen2x1
+      - qcom,ipq5018-uniphy-pcie-gen2x2
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  clock-names:
+    items:
+      - const: pipe
+
+  resets:
+    maxItems: 2
+
+  reset-names:
+    items:
+      - const: phy
+      - const: common
+
+  "#phy-cells":
+    const: 0
+
+  "#clock-cells":
+    const: 0
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - resets
+  - reset-names
+  - "#phy-cells"
+  - "#clock-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/qcom,gcc-ipq5018.h>
+    #include <dt-bindings/reset/qcom,gcc-ipq5018.h>
+
+    phy@86000 {
+        compatible = "qcom,ipq5018-uniphy-pcie-gen2x2";
+        reg = <0x86000 0x1000>;
+        clocks = <&gcc GCC_PCIE0_PIPE_CLK>;
+        clock-names = "pipe";
+        resets = <&gcc GCC_PCIE0_PHY_BCR>,
+                 <&gcc GCC_PCIE0PHY_PHY_BCR>;
+        reset-names = "phy", "common";
+        #phy-cells = <0>;
+        #clock-cells = <0>;
+    };
-- 
2.34.1

Re: [PATCH V3 1/6] dt-bindings: phy: qcom,uniphy-pcie: Document PCIe uniphy

[Krzysztof Kozlowski]

On Fri, Aug 30, 2024 at 01:41:27PM +0530, Sricharan R wrote:
> From: Nitheesh Sekar <quic_nsekar@quicinc.com>
> 
> Document the Qualcomm UNIPHY PCIe 28LP present in IPQ5018.
> 
> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
> Signed-off-by: Nitheesh Sekar <quic_nsekar@quicinc.com>
> Signed-off-by: Sricharan Ramabadhran <quic_srichara@quicinc.com>
> ---
>  [v3] Added reviewed-by tags
> 
>  .../phy/qcom,ipq5018-uniphy-pcie.yaml         | 70 +++++++++++++++++++
>  1 file changed, 70 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/phy/qcom,ipq5018-uniphy-pcie.yaml
> 
> diff --git a/Documentation/devicetree/bindings/phy/qcom,ipq5018-uniphy-pcie.yaml b/Documentation/devicetree/bindings/phy/qcom,ipq5018-uniphy-pcie.yaml
> new file mode 100644
> index 000000000000..c04dd179eb8b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/phy/qcom,ipq5018-uniphy-pcie.yaml
> @@ -0,0 +1,70 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/phy/qcom,ipq5018-uniphy-pcie.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Qualcomm UNIPHY PCIe 28LP PHY controller for genx1, genx2
> +
> +maintainers:
> +  - Nitheesh Sekar <quic_nsekar@quicinc.com>
> +  - Sricharan Ramabadhran <quic_srichara@quicinc.com>
> +
> +properties:
> +  compatible:
> +    enum:
> +      - qcom,ipq5018-uniphy-pcie-gen2x1
> +      - qcom,ipq5018-uniphy-pcie-gen2x2

... and now I wonder why there are two compatibles. Isn't the phy the
same? We talk about the same hardware?

Best regards,
Krzysztof

Re: [PATCH V3 1/6] dt-bindings: phy: qcom,uniphy-pcie: Document PCIe uniphy

[Sricharan Ramabadhran]

On 8/30/2024 1:53 PM, Krzysztof Kozlowski wrote:
> On Fri, Aug 30, 2024 at 01:41:27PM +0530, Sricharan R wrote:
>> From: Nitheesh Sekar <quic_nsekar@quicinc.com>
>>
>> Document the Qualcomm UNIPHY PCIe 28LP present in IPQ5018.
>>
>> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
>> Signed-off-by: Nitheesh Sekar <quic_nsekar@quicinc.com>
>> Signed-off-by: Sricharan Ramabadhran <quic_srichara@quicinc.com>
>> ---
>>   [v3] Added reviewed-by tags
>>
>>   .../phy/qcom,ipq5018-uniphy-pcie.yaml         | 70 +++++++++++++++++++
>>   1 file changed, 70 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/phy/qcom,ipq5018-uniphy-pcie.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/phy/qcom,ipq5018-uniphy-pcie.yaml b/Documentation/devicetree/bindings/phy/qcom,ipq5018-uniphy-pcie.yaml
>> new file mode 100644
>> index 000000000000..c04dd179eb8b
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/phy/qcom,ipq5018-uniphy-pcie.yaml
>> @@ -0,0 +1,70 @@
>> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/phy/qcom,ipq5018-uniphy-pcie.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Qualcomm UNIPHY PCIe 28LP PHY controller for genx1, genx2
>> +
>> +maintainers:
>> +  - Nitheesh Sekar <quic_nsekar@quicinc.com>
>> +  - Sricharan Ramabadhran <quic_srichara@quicinc.com>
>> +
>> +properties:
>> +  compatible:
>> +    enum:
>> +      - qcom,ipq5018-uniphy-pcie-gen2x1
>> +      - qcom,ipq5018-uniphy-pcie-gen2x2
> 
> ... and now I wonder why there are two compatibles. Isn't the phy the
> same? We talk about the same hardware?
  We have 2 different physical phys. One with single lane and another
  with dual lane. Its same IP, but for 2 lanes, 2 sets of the phy
  specific registers needs to configured. So differentiating that here.

Regards,
  Sricharan

Re: [PATCH V3 1/6] dt-bindings: phy: qcom,uniphy-pcie: Document PCIe uniphy

[Krzysztof Kozlowski]

On 04/09/2024 19:20, Sricharan Ramabadhran wrote:
> 
> 
> On 8/30/2024 1:53 PM, Krzysztof Kozlowski wrote:
>> On Fri, Aug 30, 2024 at 01:41:27PM +0530, Sricharan R wrote:
>>> From: Nitheesh Sekar <quic_nsekar@quicinc.com>
>>>
>>> Document the Qualcomm UNIPHY PCIe 28LP present in IPQ5018.
>>>
>>> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
>>> Signed-off-by: Nitheesh Sekar <quic_nsekar@quicinc.com>
>>> Signed-off-by: Sricharan Ramabadhran <quic_srichara@quicinc.com>
>>> ---
>>>   [v3] Added reviewed-by tags
>>>
>>>   .../phy/qcom,ipq5018-uniphy-pcie.yaml         | 70 +++++++++++++++++++
>>>   1 file changed, 70 insertions(+)
>>>   create mode 100644 Documentation/devicetree/bindings/phy/qcom,ipq5018-uniphy-pcie.yaml
>>>
>>> diff --git a/Documentation/devicetree/bindings/phy/qcom,ipq5018-uniphy-pcie.yaml b/Documentation/devicetree/bindings/phy/qcom,ipq5018-uniphy-pcie.yaml
>>> new file mode 100644
>>> index 000000000000..c04dd179eb8b
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/phy/qcom,ipq5018-uniphy-pcie.yaml
>>> @@ -0,0 +1,70 @@
>>> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
>>> +%YAML 1.2
>>> +---
>>> +$id: http://devicetree.org/schemas/phy/qcom,ipq5018-uniphy-pcie.yaml#
>>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>>> +
>>> +title: Qualcomm UNIPHY PCIe 28LP PHY controller for genx1, genx2
>>> +
>>> +maintainers:
>>> +  - Nitheesh Sekar <quic_nsekar@quicinc.com>
>>> +  - Sricharan Ramabadhran <quic_srichara@quicinc.com>
>>> +
>>> +properties:
>>> +  compatible:
>>> +    enum:
>>> +      - qcom,ipq5018-uniphy-pcie-gen2x1
>>> +      - qcom,ipq5018-uniphy-pcie-gen2x2
>>
>> ... and now I wonder why there are two compatibles. Isn't the phy the
>> same? We talk about the same hardware?
>   We have 2 different physical phys. One with single lane and another
>   with dual lane. Its same IP, but for 2 lanes, 2 sets of the phy
>   specific registers needs to configured. So differentiating that here.

What you described, suggests using phy mode or num-lanes in PCI
controller, not separate compatible. It's the same IP.

Best regards,
Krzysztof

[PATCH V3 2/6] dt-bindings: PCI: qcom: Add IPQ5108 SoC

[Sricharan R]

From: Nitheesh Sekar <quic_nsekar@quicinc.com>

Add support for the PCIe controller on the Qualcomm
IPQ5108 SoC to the bindings.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Nitheesh Sekar <quic_nsekar@quicinc.com>
Signed-off-by: Sricharan Ramabadhran <quic_srichara@quicinc.com>
---
 [v3] No change

 .../devicetree/bindings/pci/qcom,pcie.yaml    | 35 +++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/Documentation/devicetree/bindings/pci/qcom,pcie.yaml b/Documentation/devicetree/bindings/pci/qcom,pcie.yaml
index f867746b1ae5..c12efa27b8d8 100644
--- a/Documentation/devicetree/bindings/pci/qcom,pcie.yaml
+++ b/Documentation/devicetree/bindings/pci/qcom,pcie.yaml
@@ -21,6 +21,7 @@ properties:
           - qcom,pcie-apq8064
           - qcom,pcie-apq8084
           - qcom,pcie-ipq4019
+          - qcom,pcie-ipq5018
           - qcom,pcie-ipq6018
           - qcom,pcie-ipq8064
           - qcom,pcie-ipq8064-v2
@@ -312,6 +313,39 @@ allOf:
             - const: ahb # AHB reset
             - const: phy_ahb # PHY AHB reset
 
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - qcom,pcie-ipq5018
+    then:
+      properties:
+        clocks:
+          minItems: 6
+          maxItems: 6
+        clock-names:
+          items:
+            - const: iface # PCIe to SysNOC BIU clock
+            - const: axi_m # AXI Master clock
+            - const: axi_s # AXI Slave clock
+            - const: ahb # AHB clock
+            - const: aux # Auxiliary clock
+            - const: axi_bridge # AXI bridge clock
+        resets:
+          minItems: 8
+          maxItems: 8
+        reset-names:
+          items:
+            - const: pipe # PIPE reset
+            - const: sleep # Sleep reset
+            - const: sticky # Core sticky reset
+            - const: axi_m # AXI master reset
+            - const: axi_s # AXI slave reset
+            - const: ahb # AHB reset
+            - const: axi_m_sticky # AXI master sticky reset
+            - const: axi_s_sticky # AXI slave sticky reset
+
   - if:
       properties:
         compatible:
@@ -503,6 +537,7 @@ allOf:
               enum:
                 - qcom,pcie-apq8064
                 - qcom,pcie-ipq4019
+                - qcom,pcie-ipq5018
                 - qcom,pcie-ipq8064
                 - qcom,pcie-ipq8064v2
                 - qcom,pcie-ipq8074
-- 
2.34.1

[PATCH V3 3/6] phy: qcom: Introduce PCIe UNIPHY 28LP driver

[Sricharan R]

From: Nitheesh Sekar <quic_nsekar@quicinc.com>

Add Qualcomm PCIe UNIPHY 28LP driver support present
in Qualcomm IPQ5018 SoC and the phy init sequence.

Signed-off-by: Nitheesh Sekar <quic_nsekar@quicinc.com>
Signed-off-by: Sricharan Ramabadhran <quic_srichara@quicinc.com>
---
 [V3] Fixed dev_err_probe usage

 drivers/phy/qualcomm/Kconfig                  |  12 +
 drivers/phy/qualcomm/Makefile                 |   1 +
 .../phy/qualcomm/phy-qcom-uniphy-pcie-28lp.c  | 346 ++++++++++++++++++
 3 files changed, 359 insertions(+)
 create mode 100644 drivers/phy/qualcomm/phy-qcom-uniphy-pcie-28lp.c

diff --git a/drivers/phy/qualcomm/Kconfig b/drivers/phy/qualcomm/Kconfig
index 846f8c99547f..8f043e8cb71c 100644
--- a/drivers/phy/qualcomm/Kconfig
+++ b/drivers/phy/qualcomm/Kconfig
@@ -154,6 +154,18 @@ config PHY_QCOM_M31_USB
 	  management. This driver is required even for peripheral only or
 	  host only mode configurations.
 
+config PHY_QCOM_UNIPHY_PCIE_28LP
+	bool "PCIE UNIPHY 28LP PHY driver"
+	depends on ARCH_QCOM
+	depends on HAS_IOMEM
+	depends on OF
+	select GENERIC_PHY
+	help
+	  Enable this to support the PCIe UNIPHY 28LP phy transceiver that
+	  is used with PCIe controllers on Qualcomm IPQ5018 chips. It
+	  handles PHY initialization, clock management required after
+	  resetting the hardware and power management.
+
 config PHY_QCOM_USB_HS
 	tristate "Qualcomm USB HS PHY module"
 	depends on USB_ULPI_BUS
diff --git a/drivers/phy/qualcomm/Makefile b/drivers/phy/qualcomm/Makefile
index eb60e950ad53..42038bc30974 100644
--- a/drivers/phy/qualcomm/Makefile
+++ b/drivers/phy/qualcomm/Makefile
@@ -17,6 +17,7 @@ obj-$(CONFIG_PHY_QCOM_QMP_USB_LEGACY)	+= phy-qcom-qmp-usb-legacy.o
 obj-$(CONFIG_PHY_QCOM_QUSB2)		+= phy-qcom-qusb2.o
 obj-$(CONFIG_PHY_QCOM_SNPS_EUSB2)	+= phy-qcom-snps-eusb2.o
 obj-$(CONFIG_PHY_QCOM_EUSB2_REPEATER)	+= phy-qcom-eusb2-repeater.o
+obj-$(CONFIG_PHY_QCOM_UNIPHY_PCIE_28LP)	+= phy-qcom-uniphy-pcie-28lp.o
 obj-$(CONFIG_PHY_QCOM_USB_HS) 		+= phy-qcom-usb-hs.o
 obj-$(CONFIG_PHY_QCOM_USB_HSIC) 	+= phy-qcom-usb-hsic.o
 obj-$(CONFIG_PHY_QCOM_USB_HS_28NM)	+= phy-qcom-usb-hs-28nm.o
diff --git a/drivers/phy/qualcomm/phy-qcom-uniphy-pcie-28lp.c b/drivers/phy/qualcomm/phy-qcom-uniphy-pcie-28lp.c
new file mode 100644
index 000000000000..95740850bdc0
--- /dev/null
+++ b/drivers/phy/qualcomm/phy-qcom-uniphy-pcie-28lp.c
@@ -0,0 +1,346 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (c) 2024, The Linux Foundation. All rights reserved.
+ */
+
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/phy/phy.h>
+#include <linux/reset.h>
+#include <linux/of_device.h>
+#include <linux/delay.h>
+#include <linux/mfd/syscon.h>
+#include <linux/regmap.h>
+
+#define CDR_CTRL_REG_1		0x80
+#define CDR_CTRL_REG_2		0x84
+#define CDR_CTRL_REG_3		0x88
+#define CDR_CTRL_REG_4		0x8C
+#define CDR_CTRL_REG_5		0x90
+#define CDR_CTRL_REG_6		0x94
+#define CDR_CTRL_REG_7		0x98
+#define SSCG_CTRL_REG_1		0x9c
+#define SSCG_CTRL_REG_2		0xa0
+#define SSCG_CTRL_REG_3		0xa4
+#define SSCG_CTRL_REG_4		0xa8
+#define SSCG_CTRL_REG_5		0xac
+#define SSCG_CTRL_REG_6		0xb0
+#define PCS_INTERNAL_CONTROL_2	0x2d8
+
+#define PHY_MODE_FIXED		0x1
+
+enum qcom_uniphy_pcie_type {
+	PHY_TYPE_PCIE = 1,
+	PHY_TYPE_PCIE_GEN2,
+	PHY_TYPE_PCIE_GEN3,
+};
+
+struct qcom_uniphy_regs {
+	unsigned int offset;
+	unsigned int val;
+};
+
+struct qcom_uniphy_pcie_data {
+	int lanes;
+	/* 2nd lane offset */
+	int lane_offset;
+	unsigned int phy_type;
+	const struct qcom_uniphy_regs *init_seq;
+	unsigned int init_seq_num;
+};
+
+struct qcom_uniphy_pcie {
+	struct phy phy;
+	struct device *dev;
+	const struct qcom_uniphy_pcie_data *data;
+	struct clk_bulk_data *clks;
+	int num_clks;
+	struct reset_control *resets;
+	void __iomem *base;
+};
+
+#define	phy_to_dw_phy(x)	container_of((x), struct qca_uni_pcie_phy, phy)
+
+static const struct qcom_uniphy_regs ipq5018_regs[] = {
+	{
+		.offset = SSCG_CTRL_REG_4,
+		.val = 0x1cb9,
+	},
+	{
+		.offset = SSCG_CTRL_REG_5,
+		.val = 0x023a,
+	},
+	{
+		.offset = SSCG_CTRL_REG_3,
+		.val = 0xd360,
+	},
+	{
+		.offset = SSCG_CTRL_REG_1,
+		.val = 0x1,
+	},
+	{
+		.offset = SSCG_CTRL_REG_2,
+		.val = 0xeb,
+	},
+	{
+		.offset = CDR_CTRL_REG_4,
+		.val = 0x3f9,
+	},
+	{
+		.offset = CDR_CTRL_REG_5,
+		.val = 0x1c9,
+	},
+	{
+		.offset = CDR_CTRL_REG_2,
+		.val = 0x419,
+	},
+	{
+		.offset = CDR_CTRL_REG_1,
+		.val = 0x200,
+	},
+	{
+		.offset = PCS_INTERNAL_CONTROL_2,
+		.val = 0xf101,
+	},
+};
+
+static const struct qcom_uniphy_pcie_data ipq5018_2x1_data = {
+	.lanes		= 1,
+	.lane_offset	= 0x800,
+	.phy_type	= PHY_TYPE_PCIE_GEN2,
+	.init_seq	= ipq5018_regs,
+	.init_seq_num	= ARRAY_SIZE(ipq5018_regs),
+};
+
+static const struct qcom_uniphy_pcie_data ipq5018_2x2_data = {
+	.lanes		= 2,
+	.lane_offset	= 0x800,
+	.phy_type	= PHY_TYPE_PCIE_GEN2,
+	.init_seq	= ipq5018_regs,
+	.init_seq_num	= ARRAY_SIZE(ipq5018_regs),
+};
+
+static void qcom_uniphy_pcie_init(struct qcom_uniphy_pcie *phy)
+{
+	const struct qcom_uniphy_pcie_data *data = phy->data;
+	const struct qcom_uniphy_regs *init_seq;
+	void __iomem *base = phy->base;
+	int lane = 0;
+	int i;
+
+	for (lane = 0; lane < data->lanes; lane++) {
+		init_seq = data->init_seq;
+
+		for (i = 0; i < data->init_seq_num; i++, init_seq++)
+			writel(init_seq->val, base + init_seq->offset);
+
+		base += data->lane_offset;
+	}
+}
+
+static int qcom_uniphy_pcie_power_off(struct phy *x)
+{
+	struct qcom_uniphy_pcie *phy = phy_get_drvdata(x);
+
+	reset_control_assert(phy->resets);
+
+	clk_bulk_disable_unprepare(phy->num_clks, phy->clks);
+
+	return 0;
+}
+
+static int qcom_uniphy_pcie_power_on(struct phy *x)
+{
+	int ret;
+	struct qcom_uniphy_pcie *phy = phy_get_drvdata(x);
+
+	ret = clk_bulk_prepare_enable(phy->num_clks, phy->clks);
+	if (ret) {
+		dev_err(phy->dev, "clk prepare and enable failed %d\n", ret);
+		return ret;
+	}
+
+	usleep_range(30, 50);
+
+	ret = reset_control_assert(phy->resets);
+	if (ret) {
+		dev_err(phy->dev, "reset assert failed (%d)\n", ret);
+		return ret;
+	}
+
+	/*
+	 * Delay periods before and after reset deassert are working values
+	 * from downstream Codeaurora kernel
+	 */
+	usleep_range(100, 150);
+
+	ret = reset_control_deassert(phy->resets);
+	if (ret) {
+		dev_err(phy->dev, "reset deassert failed (%d)\n", ret);
+		return ret;
+	}
+
+	usleep_range(5000, 5100);
+
+	qcom_uniphy_pcie_init(phy);
+
+	return 0;
+}
+
+static inline int qcom_uniphy_pcie_get_resources(struct platform_device *pdev,
+						 struct qcom_uniphy_pcie *phy)
+{
+	struct resource *res;
+
+	phy->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
+	if (IS_ERR(phy->base)) {
+		dev_err(phy->dev, "cannot get phy registers\n");
+		return PTR_ERR(phy->base);
+	}
+
+	phy->num_clks = devm_clk_bulk_get_all(phy->dev, &phy->clks);
+	if (phy->num_clks < 0)
+		return phy->num_clks;
+
+	phy->resets = devm_reset_control_array_get_exclusive(phy->dev);
+	if (IS_ERR(phy->resets))
+		return PTR_ERR(phy->resets);
+
+	return 0;
+}
+
+/*
+ * Register a fixed rate pipe clock.
+ *
+ * The <s>_pipe_clksrc generated by PHY goes to the GCC that gate
+ * controls it. The <s>_pipe_clk coming out of the GCC is requested
+ * by the PHY driver for its operations.
+ * We register the <s>_pipe_clksrc here. The gcc driver takes care
+ * of assigning this <s>_pipe_clksrc as parent to <s>_pipe_clk.
+ * Below picture shows this relationship.
+ *
+ *         +---------------+
+ *         |   PHY block   |<<---------------------------------------+
+ *         |               |                                         |
+ *         |   +-------+   |                   +-----+               |
+ *   I/P---^-->|  PLL  |---^--->pipe_clksrc--->| GCC |--->pipe_clk---+
+ *    clk  |   +-------+   |                   +-----+
+ *         +---------------+
+ */
+static inline int phy_pipe_clk_register(struct qcom_uniphy_pcie  *phy,
+					struct device_node *np)
+{
+	struct clk_init_data init = { };
+	struct clk_fixed_rate *fixed;
+	struct clk_hw *hw;
+	char name[64];
+	int ret;
+
+	snprintf(name, sizeof(name), "%s::pipe_clk", dev_name(phy->dev));
+
+	fixed = devm_kzalloc(phy->dev, sizeof(*fixed), GFP_KERNEL);
+	if (!fixed)
+		return -ENOMEM;
+
+	init.ops = &clk_fixed_rate_ops;
+	fixed->fixed_rate = 125000000;
+	fixed->hw.init = &init;
+	hw = &fixed->hw;
+
+	hw = devm_clk_hw_register_fixed_rate(phy->dev, name, NULL,
+					     0, 125000000);
+	if (IS_ERR(hw))
+		return PTR_ERR(hw);
+
+	ret = devm_of_clk_add_hw_provider(phy->dev, of_clk_hw_simple_get, hw);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static const struct of_device_id qcom_uniphy_pcie_id_table[] = {
+	{
+		.compatible = "qcom,ipq5018-uniphy-pcie-gen2x2",
+		.data = &ipq5018_2x2_data,
+	},
+	{
+		.compatible = "qcom,ipq5018-uniphy-pcie-gen2x1",
+		.data = &ipq5018_2x1_data,
+	},
+
+	{ /* Sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, qcom_uniphy_pcie_id_table);
+
+static const struct phy_ops pcie_ops = {
+	.power_on	= qcom_uniphy_pcie_power_on,
+	.power_off	= qcom_uniphy_pcie_power_off,
+	.owner          = THIS_MODULE,
+};
+
+static int qcom_uniphy_pcie_probe(struct platform_device *pdev)
+{
+	struct phy_provider *phy_provider;
+	struct device *dev = &pdev->dev;
+	struct qcom_uniphy_pcie *phy;
+	struct phy *generic_phy;
+	struct device_node *np;
+	int ret;
+
+	np = of_node_get(dev->of_node);
+
+	phy = devm_kzalloc(&pdev->dev, sizeof(*phy), GFP_KERNEL);
+	if (!phy)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, phy);
+	phy->dev = &pdev->dev;
+
+	phy->data = of_device_get_match_data(dev);
+	if (!phy->data)
+		return dev_err_probe(&pdev->dev, PTR_ERR(phy->data),
+				     "Failed to get data\n");
+
+	ret = qcom_uniphy_pcie_get_resources(pdev, phy);
+	if (ret < 0)
+		return dev_err_probe(&pdev->dev, ret,
+				     "Failed to get resources:\n");
+
+	ret = phy_pipe_clk_register(phy, np);
+	if (ret)
+		return dev_err_probe(&pdev->dev, ret,
+				     "pipe clk register failed\n");
+
+	generic_phy = devm_phy_create(phy->dev, NULL, &pcie_ops);
+	if (IS_ERR(generic_phy))
+		return dev_err_probe(&pdev->dev, PTR_ERR(generic_phy),
+				     "phy create failed\n");
+
+	phy_set_drvdata(generic_phy, phy);
+	phy_provider = devm_of_phy_provider_register(phy->dev,
+						     of_phy_simple_xlate);
+	if (IS_ERR(phy_provider))
+		return dev_err_probe(&pdev->dev, PTR_ERR(phy_provider),
+				     "phy register failed\n");
+
+	return 0;
+}
+
+static struct platform_driver qcom_uniphy_pcie_driver = {
+	.probe		= qcom_uniphy_pcie_probe,
+	.driver		= {
+		.name	= "qcom-uniphy-pcie",
+		.of_match_table = qcom_uniphy_pcie_id_table,
+	},
+};
+
+module_platform_driver(qcom_uniphy_pcie_driver);
+
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_DESCRIPTION("PCIE QCOM UNIPHY driver");
-- 
2.34.1

Re: [PATCH V3 3/6] phy: qcom: Introduce PCIe UNIPHY 28LP driver

[Konrad Dybcio]

On 30.08.2024 10:11 AM, Sricharan R wrote:
> From: Nitheesh Sekar <quic_nsekar@quicinc.com>
> 
> Add Qualcomm PCIe UNIPHY 28LP driver support present
> in Qualcomm IPQ5018 SoC and the phy init sequence.
> 
> Signed-off-by: Nitheesh Sekar <quic_nsekar@quicinc.com>
> Signed-off-by: Sricharan Ramabadhran <quic_srichara@quicinc.com>
> ---

[...]

> +static const struct qcom_uniphy_pcie_data ipq5018_2x1_data = {
> +	.lanes		= 1,
> +	.lane_offset	= 0x800,
> +	.phy_type	= PHY_TYPE_PCIE_GEN2,
> +	.init_seq	= ipq5018_regs,
> +	.init_seq_num	= ARRAY_SIZE(ipq5018_regs),
> +};
> +
> +static const struct qcom_uniphy_pcie_data ipq5018_2x2_data = {
> +	.lanes		= 2,
> +	.lane_offset	= 0x800,
> +	.phy_type	= PHY_TYPE_PCIE_GEN2,
> +	.init_seq	= ipq5018_regs,
> +	.init_seq_num	= ARRAY_SIZE(ipq5018_regs),
> +};

As krzk suggested, the difference is just num-lanes

[...]

> +static int qcom_uniphy_pcie_power_off(struct phy *x)
> +{
> +	struct qcom_uniphy_pcie *phy = phy_get_drvdata(x);
> +	
> +	reset_control_assert(phy->resets);

Is the reset line supposed to be kept asserted?

[...]

> +MODULE_LICENSE("Dual BSD/GPL");

Was that intended?

Konrad

[PATCH V3 4/6] PCI: qcom: Add support for IPQ5018

[Sricharan R]

Introduce a new compatible and re-use 2_9_0 ops.

Signed-off-by: Nitheesh Sekar <quic_nsekar@quicinc.com>
Signed-off-by: Sricharan R <quic_srichara@quicinc.com>
---
 [V3] No change

 drivers/pci/controller/dwc/pcie-qcom.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index 6f953e32d990..e814d6cc062d 100644
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -1722,6 +1722,7 @@ static const struct of_device_id qcom_pcie_match[] = {
 	{ .compatible = "qcom,pcie-apq8064", .data = &cfg_2_1_0 },
 	{ .compatible = "qcom,pcie-apq8084", .data = &cfg_1_0_0 },
 	{ .compatible = "qcom,pcie-ipq4019", .data = &cfg_2_4_0 },
+	{ .compatible = "qcom,pcie-ipq5018", .data = &cfg_2_9_0 },
 	{ .compatible = "qcom,pcie-ipq6018", .data = &cfg_2_9_0 },
 	{ .compatible = "qcom,pcie-ipq8064", .data = &cfg_2_1_0 },
 	{ .compatible = "qcom,pcie-ipq8064-v2", .data = &cfg_2_1_0 },
-- 
2.34.1

[PATCH V3 5/6] arm64: dts: qcom: ipq5018: Add PCIe related nodes

[Sricharan R]

From: Nitheesh Sekar <quic_nsekar@quicinc.com>

Add phy and controller nodes for a 2-lane Gen2 and
1-lane Gen2 PCIe buses.

Signed-off-by: Nitheesh Sekar <quic_nsekar@quicinc.com>
Signed-off-by: Sricharan R <quic_srichara@quicinc.com>
---
 [V3] No change

 arch/arm64/boot/dts/qcom/ipq5018.dtsi | 168 +++++++++++++++++++++++++-
 1 file changed, 166 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/boot/dts/qcom/ipq5018.dtsi b/arch/arm64/boot/dts/qcom/ipq5018.dtsi
index 7e6e2c121979..dd5d6b7ff094 100644
--- a/arch/arm64/boot/dts/qcom/ipq5018.dtsi
+++ b/arch/arm64/boot/dts/qcom/ipq5018.dtsi
@@ -9,6 +9,7 @@
 #include <dt-bindings/interrupt-controller/arm-gic.h>
 #include <dt-bindings/clock/qcom,gcc-ipq5018.h>
 #include <dt-bindings/reset/qcom,gcc-ipq5018.h>
+#include <dt-bindings/gpio/gpio.h>
 
 / {
 	interrupt-parent = <&intc>;
@@ -143,7 +144,33 @@ usbphy0: phy@5b000 {
 			resets = <&gcc GCC_QUSB2_0_PHY_BCR>;
 
 			#phy-cells = <0>;
+		};
+
+		pcie_x1phy: phy@7e000{
+			compatible = "qcom,ipq5018-uniphy-pcie-gen2x1";
+			reg = <0x0007e000 0x800>;
+			#phy-cells = <0>;
+			#clock-cells = <0>;
+			clocks = <&gcc GCC_PCIE1_PIPE_CLK>;
+			clock-names = "pipe";
+			assigned-clocks = <&gcc GCC_PCIE1_PIPE_CLK>;
+			resets = <&gcc GCC_PCIE1_PHY_BCR>,
+				 <&gcc GCC_PCIE1PHY_PHY_BCR>;
+			reset-names = "phy", "common";
+			status = "disabled";
+		};
 
+		pcie_x2phy: phy@86000{
+			compatible = "qcom,ipq5018-uniphy-pcie-gen2x2";
+			reg = <0x00086000 0x1000>;
+			#phy-cells = <0>;
+			#clock-cells = <0>;
+			clocks = <&gcc GCC_PCIE0_PIPE_CLK>;
+			clock-names = "pipe";
+			assigned-clocks = <&gcc GCC_PCIE0_PIPE_CLK>;
+			resets = <&gcc GCC_PCIE0_PHY_BCR>,
+				 <&gcc GCC_PCIE0PHY_PHY_BCR>;
+			reset-names = "phy", "common";
 			status = "disabled";
 		};
 
@@ -170,8 +197,8 @@ gcc: clock-controller@1800000 {
 			reg = <0x01800000 0x80000>;
 			clocks = <&xo_board_clk>,
 				 <&sleep_clk>,
-				 <0>,
-				 <0>,
+				 <&pcie_x2phy>,
+				 <&pcie_x1phy>,
 				 <0>,
 				 <0>,
 				 <0>,
@@ -387,6 +414,143 @@ frame@b128000 {
 				status = "disabled";
 			};
 		};
+
+		pcie0: pci@80000000 {
+			compatible = "qcom,pcie-ipq5018";
+			reg =  <0x80000000 0xf1d>,
+			       <0x80000f20 0xa8>,
+			       <0x80001000 0x1000>,
+			       <0x00078000 0x3000>,
+			       <0x80100000 0x1000>;
+			reg-names = "dbi", "elbi", "atu", "parf", "config";
+			device_type = "pci";
+			linux,pci-domain = <0>;
+			bus-range = <0x00 0xff>;
+			num-lanes = <1>;
+			max-link-speed = <2>;
+			#address-cells = <3>;
+			#size-cells = <2>;
+
+			phys = <&pcie_x1phy>;
+			phy-names ="pciephy";
+
+			ranges = <0x01000000 0 0x80200000 0x80200000 0 0x00100000
+				  0x02000000 0 0x80300000 0x80300000 0 0x10000000>;
+
+			#interrupt-cells = <1>;
+			interrupt-map-mask = <0 0 0 0x7>;
+			interrupt-map = <0 0 0 1 &intc 0 0 142 IRQ_TYPE_LEVEL_HIGH>,
+					<0 0 0 2 &intc 0 0 143 IRQ_TYPE_LEVEL_HIGH>,
+					<0 0 0 3 &intc 0 0 144 IRQ_TYPE_LEVEL_HIGH>,
+					<0 0 0 4 &intc 0 0 145 IRQ_TYPE_LEVEL_HIGH>;
+
+			interrupts = <GIC_SPI 119 IRQ_TYPE_LEVEL_HIGH>;
+			interrupt-names = "global_irq";
+
+			clocks = <&gcc GCC_SYS_NOC_PCIE1_AXI_CLK>,
+				 <&gcc GCC_PCIE1_AXI_M_CLK>,
+				 <&gcc GCC_PCIE1_AXI_S_CLK>,
+				 <&gcc GCC_PCIE1_AHB_CLK>,
+				 <&gcc GCC_PCIE1_AUX_CLK>,
+				 <&gcc GCC_PCIE1_AXI_S_BRIDGE_CLK>;
+
+			clock-names = "iface",
+				      "axi_m",
+				      "axi_s",
+				      "ahb",
+				      "aux",
+				      "axi_bridge";
+
+			resets = <&gcc GCC_PCIE1_PIPE_ARES>,
+				 <&gcc GCC_PCIE1_SLEEP_ARES>,
+				 <&gcc GCC_PCIE1_CORE_STICKY_ARES>,
+				 <&gcc GCC_PCIE1_AXI_MASTER_ARES>,
+				 <&gcc GCC_PCIE1_AXI_SLAVE_ARES>,
+				 <&gcc GCC_PCIE1_AHB_ARES>,
+				 <&gcc GCC_PCIE1_AXI_MASTER_STICKY_ARES>,
+				 <&gcc GCC_PCIE1_AXI_SLAVE_STICKY_ARES>;
+
+			reset-names = "pipe",
+				      "sleep",
+				      "sticky",
+				      "axi_m",
+				      "axi_s",
+				      "ahb",
+				      "axi_m_sticky",
+				      "axi_s_sticky";
+
+			msi-map = <0x0 &v2m0 0x0 0xff8>;
+			status = "disabled";
+		};
+
+		pcie1: pci@a0000000 {
+			compatible = "qcom,pcie-ipq5018";
+			reg =  <0xa0000000 0xf1d>,
+			       <0xa0000f20 0xa8>,
+			       <0xa0001000 0x1000>,
+			       <0x00080000 0x3000>,
+			       <0xa0100000 0x1000>;
+			reg-names = "dbi", "elbi", "atu", "parf", "config";
+			device_type = "pci";
+			linux,pci-domain = <1>;
+			bus-range = <0x00 0xff>;
+			num-lanes = <2>;
+			max-link-speed = <2>;
+			#address-cells = <3>;
+			#size-cells = <2>;
+
+			phys = <&pcie_x2phy>;
+			phy-names ="pciephy";
+
+			ranges = <0x01000000 0 0xa0200000 0xa0200000 0 0x00100000
+				  0x02000000 0 0xa0300000 0xa0300000 0 0x10000000>;
+
+			#interrupt-cells = <1>;
+			interrupt-map-mask = <0 0 0 0x7>;
+			interrupt-map = <0 0 0 1 &intc 0 0 75 IRQ_TYPE_LEVEL_HIGH>,
+					<0 0 0 2 &intc 0 0 78 IRQ_TYPE_LEVEL_HIGH>,
+					<0 0 0 3 &intc 0 0 79 IRQ_TYPE_LEVEL_HIGH>,
+					<0 0 0 4 &intc 0 0 83 IRQ_TYPE_LEVEL_HIGH>;
+
+			interrupts = <GIC_SPI 51 IRQ_TYPE_LEVEL_HIGH>;
+			interrupt-names = "global_irq";
+
+			clocks = <&gcc GCC_SYS_NOC_PCIE0_AXI_CLK>,
+				 <&gcc GCC_PCIE0_AXI_M_CLK>,
+				 <&gcc GCC_PCIE0_AXI_S_CLK>,
+				 <&gcc GCC_PCIE0_AHB_CLK>,
+				 <&gcc GCC_PCIE0_AUX_CLK>,
+				 <&gcc GCC_PCIE0_AXI_S_BRIDGE_CLK>;
+
+			clock-names = "iface",
+				      "axi_m",
+				      "axi_s",
+				      "ahb",
+				      "aux",
+				      "axi_bridge";
+
+			resets = <&gcc GCC_PCIE0_PIPE_ARES>,
+				 <&gcc GCC_PCIE0_SLEEP_ARES>,
+				 <&gcc GCC_PCIE0_CORE_STICKY_ARES>,
+				 <&gcc GCC_PCIE0_AXI_MASTER_ARES>,
+				 <&gcc GCC_PCIE0_AXI_SLAVE_ARES>,
+				 <&gcc GCC_PCIE0_AHB_ARES>,
+				 <&gcc GCC_PCIE0_AXI_MASTER_STICKY_ARES>,
+				 <&gcc GCC_PCIE0_AXI_SLAVE_STICKY_ARES>;
+
+			reset-names = "pipe",
+				      "sleep",
+				      "sticky",
+				      "axi_m",
+				      "axi_s",
+				      "ahb",
+				      "axi_m_sticky",
+				      "axi_s_sticky";
+
+			msi-map = <0x0 &v2m0 0x0 0xff8>;
+			status = "disabled";
+		};
+
 	};
 
 	timer {
-- 
2.34.1

[PATCH V3 6/6] arm64: dts: qcom: ipq5018: Enable PCIe

[Sricharan R]

From: Nitheesh Sekar <quic_nsekar@quicinc.com>

Enable the PCIe controller and PHY nodes for RDP 432-c2.

Signed-off-by: Nitheesh Sekar <quic_nsekar@quicinc.com>
Signed-off-by: Sricharan Ramabadhran <quic_srichara@quicinc.com>
---
 [V3] Added perst/wake pins

 .../arm64/boot/dts/qcom/ipq5018-rdp432-c2.dts | 37 +++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/ipq5018-rdp432-c2.dts b/arch/arm64/boot/dts/qcom/ipq5018-rdp432-c2.dts
index 8460b538eb6a..602c3c2d6ca3 100644
--- a/arch/arm64/boot/dts/qcom/ipq5018-rdp432-c2.dts
+++ b/arch/arm64/boot/dts/qcom/ipq5018-rdp432-c2.dts
@@ -28,6 +28,19 @@ &blsp1_uart1 {
 	status = "okay";
 };
 
+&pcie1 {
+	pinctrl-0 = <&pcie1_default>;
+	pinctrl-names = "default";
+
+	perst-gpios = <&tlmm 15 GPIO_ACTIVE_LOW>;
+	wake-gpios = <&tlmm 19 GPIO_ACTIVE_LOW>;
+	status = "okay";
+};
+
+&pcie_x2phy {
+	status = "okay";
+};
+
 &sdhc_1 {
 	pinctrl-0 = <&sdc_default_state>;
 	pinctrl-names = "default";
@@ -43,6 +56,30 @@ &sleep_clk {
 };
 
 &tlmm {
+	pcie1_default: pcie1-default-state {
+		clkreq-n-pins {
+			pins = "gpio17";
+			function = "pcie1_clk";
+			drive-strength = <6>;
+			bias-pull-up;
+		};
+
+		perst-n-pins {
+			pins = "gpio15";
+			function = "gpio";
+			drive-strength = <8>;
+			bias-pull-down;
+			output-low;
+		};
+
+		wake-n-pins {
+			pins = "gpio19";
+			function = "pcie1_wake";
+			drive-strength = <6>;
+			bias-pull-up;
+		};
+	};
+
 	sdc_default_state: sdc-default-state {
 		clk-pins {
 			pins = "gpio9";
-- 
2.34.1