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* [PATCHv2 0/7] PCI: layerscape: Add power management support
@ 2020-10-27  7:29 Zhiqiang Hou
  2020-10-27  7:29 ` [PATCHv2 1/7] PCI: dwc: Fix a bug of the case dw_pci->ops is NULL Zhiqiang Hou
                   ` (6 more replies)
  0 siblings, 7 replies; 8+ messages in thread
From: Zhiqiang Hou @ 2020-10-27  7:29 UTC (permalink / raw)
  To: linux-pci, devicetree, linux-kernel, linux-arm-kernel,
	lorenzo.pieralisi, robh+dt, bhelgaas, shawnguo, leoyang.li,
	gustavo.pimentel
  Cc: minghuan.Lian, mingkai.hu, roy.zang, Hou Zhiqiang

From: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>

This patch series is to add PCIe power management support for NXP
Layerscape platfroms.

Hou Zhiqiang (7):
  PCI: dwc: Fix a bug of the case dw_pci->ops is NULL
  PCI: layerscape: Change to use the DWC common link-up check function
  dt-bindings: pci: layerscape-pci: Add a optional property big-endian
  arm64: dts: layerscape: Add big-endian property for PCIe nodes
  dt-bindings: pci: layerscape-pci: Update the description of SCFG
    property
  dts: arm64: ls1043a: Add SCFG phandle for PCIe nodes
  PCI: layerscape: Add power management support

 .../bindings/pci/layerscape-pci.txt           |   6 +-
 .../arm64/boot/dts/freescale/fsl-ls1012a.dtsi |   1 +
 .../arm64/boot/dts/freescale/fsl-ls1043a.dtsi |   6 +
 .../arm64/boot/dts/freescale/fsl-ls1046a.dtsi |   3 +
 drivers/pci/controller/dwc/pci-layerscape.c   | 469 ++++++++++++++----
 drivers/pci/controller/dwc/pcie-designware.c  |  14 +-
 drivers/pci/controller/dwc/pcie-designware.h  |   1 +
 7 files changed, 385 insertions(+), 115 deletions(-)

-- 
2.17.1


^ permalink raw reply	[flat|nested] 8+ messages in thread

* [PATCHv2 1/7] PCI: dwc: Fix a bug of the case dw_pci->ops is NULL
  2020-10-27  7:29 [PATCHv2 0/7] PCI: layerscape: Add power management support Zhiqiang Hou
@ 2020-10-27  7:29 ` Zhiqiang Hou
  2020-10-27  7:29 ` [PATCHv2 2/7] PCI: layerscape: Change to use the DWC common link-up check function Zhiqiang Hou
                   ` (5 subsequent siblings)
  6 siblings, 0 replies; 8+ messages in thread
From: Zhiqiang Hou @ 2020-10-27  7:29 UTC (permalink / raw)
  To: linux-pci, devicetree, linux-kernel, linux-arm-kernel,
	lorenzo.pieralisi, robh+dt, bhelgaas, shawnguo, leoyang.li,
	gustavo.pimentel
  Cc: minghuan.Lian, mingkai.hu, roy.zang, Hou Zhiqiang

From: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>

The dw_pci->ops may be a NULL, and fix it by adding one more check.

Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Acked-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
---
V2:
 - Rebased the patch against the latest code.

 drivers/pci/controller/dwc/pcie-designware.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c
index c2dea8fc97c8..7a5024450c4d 100644
--- a/drivers/pci/controller/dwc/pcie-designware.c
+++ b/drivers/pci/controller/dwc/pcie-designware.c
@@ -141,7 +141,7 @@ u32 dw_pcie_read_dbi(struct dw_pcie *pci, u32 reg, size_t size)
 	int ret;
 	u32 val;
 
-	if (pci->ops->read_dbi)
+	if (pci->ops && pci->ops->read_dbi)
 		return pci->ops->read_dbi(pci, pci->dbi_base, reg, size);
 
 	ret = dw_pcie_read(pci->dbi_base + reg, size, &val);
@@ -156,7 +156,7 @@ void dw_pcie_write_dbi(struct dw_pcie *pci, u32 reg, size_t size, u32 val)
 {
 	int ret;
 
-	if (pci->ops->write_dbi) {
+	if (pci->ops && pci->ops->write_dbi) {
 		pci->ops->write_dbi(pci, pci->dbi_base, reg, size, val);
 		return;
 	}
@@ -171,7 +171,7 @@ void dw_pcie_write_dbi2(struct dw_pcie *pci, u32 reg, size_t size, u32 val)
 {
 	int ret;
 
-	if (pci->ops->write_dbi2) {
+	if (pci->ops && pci->ops->write_dbi2) {
 		pci->ops->write_dbi2(pci, pci->dbi_base2, reg, size, val);
 		return;
 	}
@@ -186,7 +186,7 @@ static u32 dw_pcie_readl_atu(struct dw_pcie *pci, u32 reg)
 	int ret;
 	u32 val;
 
-	if (pci->ops->read_dbi)
+	if (pci->ops && pci->ops->read_dbi)
 		return pci->ops->read_dbi(pci, pci->atu_base, reg, 4);
 
 	ret = dw_pcie_read(pci->atu_base + reg, 4, &val);
@@ -200,7 +200,7 @@ static void dw_pcie_writel_atu(struct dw_pcie *pci, u32 reg, u32 val)
 {
 	int ret;
 
-	if (pci->ops->write_dbi) {
+	if (pci->ops && pci->ops->write_dbi) {
 		pci->ops->write_dbi(pci, pci->atu_base, reg, 4, val);
 		return;
 	}
@@ -271,7 +271,7 @@ static void __dw_pcie_prog_outbound_atu(struct dw_pcie *pci, u8 func_no,
 {
 	u32 retries, val;
 
-	if (pci->ops->cpu_addr_fixup)
+	if (pci->ops && pci->ops->cpu_addr_fixup)
 		cpu_addr = pci->ops->cpu_addr_fixup(pci, cpu_addr);
 
 	if (pci->iatu_unroll_enabled) {
@@ -479,7 +479,7 @@ int dw_pcie_link_up(struct dw_pcie *pci)
 {
 	u32 val;
 
-	if (pci->ops->link_up)
+	if (pci->ops && pci->ops->link_up)
 		return pci->ops->link_up(pci);
 
 	val = readl(pci->dbi_base + PCIE_PORT_DEBUG1);
-- 
2.17.1


^ permalink raw reply	[flat|nested] 8+ messages in thread

* [PATCHv2 2/7] PCI: layerscape: Change to use the DWC common link-up check function
  2020-10-27  7:29 [PATCHv2 0/7] PCI: layerscape: Add power management support Zhiqiang Hou
  2020-10-27  7:29 ` [PATCHv2 1/7] PCI: dwc: Fix a bug of the case dw_pci->ops is NULL Zhiqiang Hou
@ 2020-10-27  7:29 ` Zhiqiang Hou
  2020-10-27  7:29 ` [PATCHv2 3/7] dt-bindings: pci: layerscape-pci: Add a optional property big-endian Zhiqiang Hou
                   ` (4 subsequent siblings)
  6 siblings, 0 replies; 8+ messages in thread
From: Zhiqiang Hou @ 2020-10-27  7:29 UTC (permalink / raw)
  To: linux-pci, devicetree, linux-kernel, linux-arm-kernel,
	lorenzo.pieralisi, robh+dt, bhelgaas, shawnguo, leoyang.li,
	gustavo.pimentel
  Cc: minghuan.Lian, mingkai.hu, roy.zang, Hou Zhiqiang

From: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>

The current Layerscape PCIe driver directly uses the physical layer
LTSSM code to check the link-up state, which treats the > L0 states
as link-up. This is not correct, since there is not explicit map
between link-up state and LTSSM. So this patch changes to use the
DWC common link-up check function.

Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
Reviewed-by: Rob Herring <robh@kernel.org>
---
V2:
 - No change.

 drivers/pci/controller/dwc/pci-layerscape.c | 141 ++------------------
 1 file changed, 10 insertions(+), 131 deletions(-)

diff --git a/drivers/pci/controller/dwc/pci-layerscape.c b/drivers/pci/controller/dwc/pci-layerscape.c
index f24f79a70d9a..be404c16bcbe 100644
--- a/drivers/pci/controller/dwc/pci-layerscape.c
+++ b/drivers/pci/controller/dwc/pci-layerscape.c
@@ -22,12 +22,6 @@
 
 #include "pcie-designware.h"
 
-/* PEX1/2 Misc Ports Status Register */
-#define SCFG_PEXMSCPORTSR(pex_idx)	(0x94 + (pex_idx) * 4)
-#define LTSSM_STATE_SHIFT	20
-#define LTSSM_STATE_MASK	0x3f
-#define LTSSM_PCIE_L0		0x11 /* L0 state */
-
 /* PEX Internal Configuration Registers */
 #define PCIE_STRFMR1		0x71c /* Symbol Timer & Filter Mask Register1 */
 #define PCIE_ABSERR		0x8d0 /* Bridge Slave Error Response Register */
@@ -36,19 +30,12 @@
 #define PCIE_IATU_NUM		6
 
 struct ls_pcie_drvdata {
-	u32 lut_offset;
-	u32 ltssm_shift;
-	u32 lut_dbg;
 	const struct dw_pcie_host_ops *ops;
-	const struct dw_pcie_ops *dw_pcie_ops;
 };
 
 struct ls_pcie {
 	struct dw_pcie *pci;
-	void __iomem *lut;
-	struct regmap *scfg;
 	const struct ls_pcie_drvdata *drvdata;
-	int index;
 };
 
 #define to_ls_pcie(x)	dev_get_drvdata((x)->dev)
@@ -91,38 +78,6 @@ static void ls_pcie_disable_outbound_atus(struct ls_pcie *pcie)
 		dw_pcie_disable_atu(pcie->pci, i, DW_PCIE_REGION_OUTBOUND);
 }
 
-static int ls1021_pcie_link_up(struct dw_pcie *pci)
-{
-	u32 state;
-	struct ls_pcie *pcie = to_ls_pcie(pci);
-
-	if (!pcie->scfg)
-		return 0;
-
-	regmap_read(pcie->scfg, SCFG_PEXMSCPORTSR(pcie->index), &state);
-	state = (state >> LTSSM_STATE_SHIFT) & LTSSM_STATE_MASK;
-
-	if (state < LTSSM_PCIE_L0)
-		return 0;
-
-	return 1;
-}
-
-static int ls_pcie_link_up(struct dw_pcie *pci)
-{
-	struct ls_pcie *pcie = to_ls_pcie(pci);
-	u32 state;
-
-	state = (ioread32(pcie->lut + pcie->drvdata->lut_dbg) >>
-		 pcie->drvdata->ltssm_shift) &
-		 LTSSM_STATE_MASK;
-
-	if (state < LTSSM_PCIE_L0)
-		return 0;
-
-	return 1;
-}
-
 /* Forward error response of outbound non-posted requests */
 static void ls_pcie_fix_error_response(struct ls_pcie *pcie)
 {
@@ -155,33 +110,6 @@ static int ls_pcie_host_init(struct pcie_port *pp)
 	return 0;
 }
 
-static int ls1021_pcie_host_init(struct pcie_port *pp)
-{
-	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
-	struct ls_pcie *pcie = to_ls_pcie(pci);
-	struct device *dev = pci->dev;
-	u32 index[2];
-	int ret;
-
-	pcie->scfg = syscon_regmap_lookup_by_phandle(dev->of_node,
-						     "fsl,pcie-scfg");
-	if (IS_ERR(pcie->scfg)) {
-		ret = PTR_ERR(pcie->scfg);
-		dev_err(dev, "No syscfg phandle specified\n");
-		pcie->scfg = NULL;
-		return ret;
-	}
-
-	if (of_property_read_u32_array(dev->of_node,
-				       "fsl,pcie-scfg", index, 2)) {
-		pcie->scfg = NULL;
-		return -EINVAL;
-	}
-	pcie->index = index[1];
-
-	return ls_pcie_host_init(pp);
-}
-
 static int ls_pcie_msi_host_init(struct pcie_port *pp)
 {
 	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
@@ -205,71 +133,25 @@ static int ls_pcie_msi_host_init(struct pcie_port *pp)
 	return 0;
 }
 
-static const struct dw_pcie_host_ops ls1021_pcie_host_ops = {
-	.host_init = ls1021_pcie_host_init,
-	.msi_host_init = ls_pcie_msi_host_init,
-};
-
 static const struct dw_pcie_host_ops ls_pcie_host_ops = {
 	.host_init = ls_pcie_host_init,
 	.msi_host_init = ls_pcie_msi_host_init,
 };
 
-static const struct dw_pcie_ops dw_ls1021_pcie_ops = {
-	.link_up = ls1021_pcie_link_up,
-};
-
-static const struct dw_pcie_ops dw_ls_pcie_ops = {
-	.link_up = ls_pcie_link_up,
-};
-
-static const struct ls_pcie_drvdata ls1021_drvdata = {
-	.ops = &ls1021_pcie_host_ops,
-	.dw_pcie_ops = &dw_ls1021_pcie_ops,
-};
-
-static const struct ls_pcie_drvdata ls1043_drvdata = {
-	.lut_offset = 0x10000,
-	.ltssm_shift = 24,
-	.lut_dbg = 0x7fc,
-	.ops = &ls_pcie_host_ops,
-	.dw_pcie_ops = &dw_ls_pcie_ops,
-};
-
-static const struct ls_pcie_drvdata ls1046_drvdata = {
-	.lut_offset = 0x80000,
-	.ltssm_shift = 24,
-	.lut_dbg = 0x407fc,
-	.ops = &ls_pcie_host_ops,
-	.dw_pcie_ops = &dw_ls_pcie_ops,
-};
-
-static const struct ls_pcie_drvdata ls2080_drvdata = {
-	.lut_offset = 0x80000,
-	.ltssm_shift = 0,
-	.lut_dbg = 0x7fc,
-	.ops = &ls_pcie_host_ops,
-	.dw_pcie_ops = &dw_ls_pcie_ops,
-};
-
-static const struct ls_pcie_drvdata ls2088_drvdata = {
-	.lut_offset = 0x80000,
-	.ltssm_shift = 0,
-	.lut_dbg = 0x407fc,
+static const struct ls_pcie_drvdata layerscape_drvdata = {
 	.ops = &ls_pcie_host_ops,
-	.dw_pcie_ops = &dw_ls_pcie_ops,
 };
 
 static const struct of_device_id ls_pcie_of_match[] = {
-	{ .compatible = "fsl,ls1012a-pcie", .data = &ls1046_drvdata },
-	{ .compatible = "fsl,ls1021a-pcie", .data = &ls1021_drvdata },
-	{ .compatible = "fsl,ls1028a-pcie", .data = &ls2088_drvdata },
-	{ .compatible = "fsl,ls1043a-pcie", .data = &ls1043_drvdata },
-	{ .compatible = "fsl,ls1046a-pcie", .data = &ls1046_drvdata },
-	{ .compatible = "fsl,ls2080a-pcie", .data = &ls2080_drvdata },
-	{ .compatible = "fsl,ls2085a-pcie", .data = &ls2080_drvdata },
-	{ .compatible = "fsl,ls2088a-pcie", .data = &ls2088_drvdata },
-	{ .compatible = "fsl,ls1088a-pcie", .data = &ls2088_drvdata },
+	{ .compatible = "fsl,ls1012a-pcie", .data = &layerscape_drvdata },
+	{ .compatible = "fsl,ls1021a-pcie", .data = &layerscape_drvdata },
+	{ .compatible = "fsl,ls1028a-pcie", .data = &layerscape_drvdata },
+	{ .compatible = "fsl,ls1043a-pcie", .data = &layerscape_drvdata },
+	{ .compatible = "fsl,ls1046a-pcie", .data = &layerscape_drvdata },
+	{ .compatible = "fsl,ls2080a-pcie", .data = &layerscape_drvdata },
+	{ .compatible = "fsl,ls2085a-pcie", .data = &layerscape_drvdata },
+	{ .compatible = "fsl,ls2088a-pcie", .data = &layerscape_drvdata },
+	{ .compatible = "fsl,ls1088a-pcie", .data = &layerscape_drvdata },
 	{ },
 };
 
@@ -310,7 +192,6 @@ static int __init ls_pcie_probe(struct platform_device *pdev)
 	pcie->drvdata = of_device_get_match_data(dev);
 
 	pci->dev = dev;
-	pci->ops = pcie->drvdata->dw_pcie_ops;
 
 	pcie->pci = pci;
 
@@ -319,8 +200,6 @@ static int __init ls_pcie_probe(struct platform_device *pdev)
 	if (IS_ERR(pci->dbi_base))
 		return PTR_ERR(pci->dbi_base);
 
-	pcie->lut = pci->dbi_base + pcie->drvdata->lut_offset;
-
 	if (!ls_pcie_is_bridge(pcie))
 		return -ENODEV;
 
-- 
2.17.1


^ permalink raw reply	[flat|nested] 8+ messages in thread

* [PATCHv2 3/7] dt-bindings: pci: layerscape-pci: Add a optional property big-endian
  2020-10-27  7:29 [PATCHv2 0/7] PCI: layerscape: Add power management support Zhiqiang Hou
  2020-10-27  7:29 ` [PATCHv2 1/7] PCI: dwc: Fix a bug of the case dw_pci->ops is NULL Zhiqiang Hou
  2020-10-27  7:29 ` [PATCHv2 2/7] PCI: layerscape: Change to use the DWC common link-up check function Zhiqiang Hou
@ 2020-10-27  7:29 ` Zhiqiang Hou
  2020-10-27  7:29 ` [PATCHv2 4/7] arm64: dts: layerscape: Add big-endian property for PCIe nodes Zhiqiang Hou
                   ` (3 subsequent siblings)
  6 siblings, 0 replies; 8+ messages in thread
From: Zhiqiang Hou @ 2020-10-27  7:29 UTC (permalink / raw)
  To: linux-pci, devicetree, linux-kernel, linux-arm-kernel,
	lorenzo.pieralisi, robh+dt, bhelgaas, shawnguo, leoyang.li,
	gustavo.pimentel
  Cc: minghuan.Lian, mingkai.hu, roy.zang, Hou Zhiqiang

From: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>

This property is to indicate the endianness when accessing the
PEX_LUT and PF register block, so if these registers are
implemented in big-endian, specify this property.

Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
Acked-by: Rob Herring <robh@kernel.org>
---
V2:
 - No change.

 Documentation/devicetree/bindings/pci/layerscape-pci.txt | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Documentation/devicetree/bindings/pci/layerscape-pci.txt b/Documentation/devicetree/bindings/pci/layerscape-pci.txt
index daa99f7d4c3f..0033c898976e 100644
--- a/Documentation/devicetree/bindings/pci/layerscape-pci.txt
+++ b/Documentation/devicetree/bindings/pci/layerscape-pci.txt
@@ -39,6 +39,10 @@ Required properties:
   of the data transferred from/to the IP block. This can avoid the software
   cache flush/invalid actions, and improve the performance significantly.
 
+Optional properties:
+- big-endian: If the PEX_LUT and PF register block is in big-endian, specify
+  this property.
+
 Example:
 
 	pcie@3400000 {
-- 
2.17.1


^ permalink raw reply	[flat|nested] 8+ messages in thread

* [PATCHv2 4/7] arm64: dts: layerscape: Add big-endian property for PCIe nodes
  2020-10-27  7:29 [PATCHv2 0/7] PCI: layerscape: Add power management support Zhiqiang Hou
                   ` (2 preceding siblings ...)
  2020-10-27  7:29 ` [PATCHv2 3/7] dt-bindings: pci: layerscape-pci: Add a optional property big-endian Zhiqiang Hou
@ 2020-10-27  7:29 ` Zhiqiang Hou
  2020-10-27  7:29 ` [PATCHv2 5/7] dt-bindings: pci: layerscape-pci: Update the description of SCFG property Zhiqiang Hou
                   ` (2 subsequent siblings)
  6 siblings, 0 replies; 8+ messages in thread
From: Zhiqiang Hou @ 2020-10-27  7:29 UTC (permalink / raw)
  To: linux-pci, devicetree, linux-kernel, linux-arm-kernel,
	lorenzo.pieralisi, robh+dt, bhelgaas, shawnguo, leoyang.li,
	gustavo.pimentel
  Cc: minghuan.Lian, mingkai.hu, roy.zang, Hou Zhiqiang

From: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>

Add the big-endian property for LS1012A, LS1043A and LS1046A
PCIe devicetree nodes.

Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
---
V2:
 - No change.

 arch/arm64/boot/dts/freescale/fsl-ls1012a.dtsi | 1 +
 arch/arm64/boot/dts/freescale/fsl-ls1043a.dtsi | 3 +++
 arch/arm64/boot/dts/freescale/fsl-ls1046a.dtsi | 3 +++
 3 files changed, 7 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/fsl-ls1012a.dtsi b/arch/arm64/boot/dts/freescale/fsl-ls1012a.dtsi
index 6a2c09199047..0f63aea30477 100644
--- a/arch/arm64/boot/dts/freescale/fsl-ls1012a.dtsi
+++ b/arch/arm64/boot/dts/freescale/fsl-ls1012a.dtsi
@@ -512,6 +512,7 @@
 					<0000 0 0 2 &gic 0 111 IRQ_TYPE_LEVEL_HIGH>,
 					<0000 0 0 3 &gic 0 112 IRQ_TYPE_LEVEL_HIGH>,
 					<0000 0 0 4 &gic 0 113 IRQ_TYPE_LEVEL_HIGH>;
+			big-endian;
 			status = "disabled";
 		};
 
diff --git a/arch/arm64/boot/dts/freescale/fsl-ls1043a.dtsi b/arch/arm64/boot/dts/freescale/fsl-ls1043a.dtsi
index 0464b8aa4bc4..d33a64ae8b0f 100644
--- a/arch/arm64/boot/dts/freescale/fsl-ls1043a.dtsi
+++ b/arch/arm64/boot/dts/freescale/fsl-ls1043a.dtsi
@@ -837,6 +837,7 @@
 					<0000 0 0 2 &gic 0 111 0x4>,
 					<0000 0 0 3 &gic 0 112 0x4>,
 					<0000 0 0 4 &gic 0 113 0x4>;
+			big-endian;
 			status = "disabled";
 		};
 
@@ -863,6 +864,7 @@
 					<0000 0 0 2 &gic 0 121 0x4>,
 					<0000 0 0 3 &gic 0 122 0x4>,
 					<0000 0 0 4 &gic 0 123 0x4>;
+			big-endian;
 			status = "disabled";
 		};
 
@@ -889,6 +891,7 @@
 					<0000 0 0 2 &gic 0 155 0x4>,
 					<0000 0 0 3 &gic 0 156 0x4>,
 					<0000 0 0 4 &gic 0 157 0x4>;
+			big-endian;
 			status = "disabled";
 		};
 
diff --git a/arch/arm64/boot/dts/freescale/fsl-ls1046a.dtsi b/arch/arm64/boot/dts/freescale/fsl-ls1046a.dtsi
index 1fa39bacff4b..b01fb93f7d19 100644
--- a/arch/arm64/boot/dts/freescale/fsl-ls1046a.dtsi
+++ b/arch/arm64/boot/dts/freescale/fsl-ls1046a.dtsi
@@ -741,6 +741,7 @@
 					<0000 0 0 2 &gic GIC_SPI 110 IRQ_TYPE_LEVEL_HIGH>,
 					<0000 0 0 3 &gic GIC_SPI 110 IRQ_TYPE_LEVEL_HIGH>,
 					<0000 0 0 4 &gic GIC_SPI 110 IRQ_TYPE_LEVEL_HIGH>;
+			big-endian;
 			status = "disabled";
 		};
 
@@ -777,6 +778,7 @@
 					<0000 0 0 2 &gic GIC_SPI 120 IRQ_TYPE_LEVEL_HIGH>,
 					<0000 0 0 3 &gic GIC_SPI 120 IRQ_TYPE_LEVEL_HIGH>,
 					<0000 0 0 4 &gic GIC_SPI 120 IRQ_TYPE_LEVEL_HIGH>;
+			big-endian;
 			status = "disabled";
 		};
 
@@ -813,6 +815,7 @@
 					<0000 0 0 2 &gic GIC_SPI 154 IRQ_TYPE_LEVEL_HIGH>,
 					<0000 0 0 3 &gic GIC_SPI 154 IRQ_TYPE_LEVEL_HIGH>,
 					<0000 0 0 4 &gic GIC_SPI 154 IRQ_TYPE_LEVEL_HIGH>;
+			big-endian;
 			status = "disabled";
 		};
 
-- 
2.17.1


^ permalink raw reply	[flat|nested] 8+ messages in thread

* [PATCHv2 5/7] dt-bindings: pci: layerscape-pci: Update the description of SCFG property
  2020-10-27  7:29 [PATCHv2 0/7] PCI: layerscape: Add power management support Zhiqiang Hou
                   ` (3 preceding siblings ...)
  2020-10-27  7:29 ` [PATCHv2 4/7] arm64: dts: layerscape: Add big-endian property for PCIe nodes Zhiqiang Hou
@ 2020-10-27  7:29 ` Zhiqiang Hou
  2020-10-27  7:30 ` [PATCHv2 6/7] arm64: dts: ls1043a: Add SCFG phandle for PCIe nodes Zhiqiang Hou
  2020-10-27  7:30 ` [PATCHv2 7/7] PCI: layerscape: Add power management support Zhiqiang Hou
  6 siblings, 0 replies; 8+ messages in thread
From: Zhiqiang Hou @ 2020-10-27  7:29 UTC (permalink / raw)
  To: linux-pci, devicetree, linux-kernel, linux-arm-kernel,
	lorenzo.pieralisi, robh+dt, bhelgaas, shawnguo, leoyang.li,
	gustavo.pimentel
  Cc: minghuan.Lian, mingkai.hu, roy.zang, Hou Zhiqiang

From: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>

Update the description of the second entry of 'fsl,pcie-scfg' property,
as the LS1043A PCIe controller also has some control registers in SCFG
block, while it has 3 controllers.

Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
Acked-by: Rob Herring <robh@kernel.org>
---
V2:
 - No change.

 Documentation/devicetree/bindings/pci/layerscape-pci.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/pci/layerscape-pci.txt b/Documentation/devicetree/bindings/pci/layerscape-pci.txt
index 0033c898976e..4228562be505 100644
--- a/Documentation/devicetree/bindings/pci/layerscape-pci.txt
+++ b/Documentation/devicetree/bindings/pci/layerscape-pci.txt
@@ -33,7 +33,7 @@ Required properties:
   "intr": The interrupt that is asserted for controller interrupts
 - fsl,pcie-scfg: Must include two entries.
   The first entry must be a link to the SCFG device node
-  The second entry must be '0' or '1' based on physical PCIe controller index.
+  The second entry is the physical PCIe controller index starting from '0'.
   This is used to get SCFG PEXN registers
 - dma-coherent: Indicates that the hardware IP block can ensure the coherency
   of the data transferred from/to the IP block. This can avoid the software
-- 
2.17.1


^ permalink raw reply	[flat|nested] 8+ messages in thread

* [PATCHv2 6/7] arm64: dts: ls1043a: Add SCFG phandle for PCIe nodes
  2020-10-27  7:29 [PATCHv2 0/7] PCI: layerscape: Add power management support Zhiqiang Hou
                   ` (4 preceding siblings ...)
  2020-10-27  7:29 ` [PATCHv2 5/7] dt-bindings: pci: layerscape-pci: Update the description of SCFG property Zhiqiang Hou
@ 2020-10-27  7:30 ` Zhiqiang Hou
  2020-10-27  7:30 ` [PATCHv2 7/7] PCI: layerscape: Add power management support Zhiqiang Hou
  6 siblings, 0 replies; 8+ messages in thread
From: Zhiqiang Hou @ 2020-10-27  7:30 UTC (permalink / raw)
  To: linux-pci, devicetree, linux-kernel, linux-arm-kernel,
	lorenzo.pieralisi, robh+dt, bhelgaas, shawnguo, leoyang.li,
	gustavo.pimentel
  Cc: minghuan.Lian, mingkai.hu, roy.zang, Hou Zhiqiang

From: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>

The LS1043A PCIe controller has some control registers
in SCFG block, so add the SCFG phandle for each PCIe
controller DT node.

Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
---
V2:
 - Correct the order of the subject prefixes.

 arch/arm64/boot/dts/freescale/fsl-ls1043a.dtsi | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/fsl-ls1043a.dtsi b/arch/arm64/boot/dts/freescale/fsl-ls1043a.dtsi
index d33a64ae8b0f..23bf3796d98f 100644
--- a/arch/arm64/boot/dts/freescale/fsl-ls1043a.dtsi
+++ b/arch/arm64/boot/dts/freescale/fsl-ls1043a.dtsi
@@ -822,6 +822,7 @@
 			interrupts = <0 118 0x4>, /* controller interrupt */
 				     <0 117 0x4>; /* PME interrupt */
 			interrupt-names = "intr", "pme";
+			fsl,pcie-scfg = <&scfg 0>;
 			#address-cells = <3>;
 			#size-cells = <2>;
 			device_type = "pci";
@@ -849,6 +850,7 @@
 			interrupts = <0 128 0x4>,
 				     <0 127 0x4>;
 			interrupt-names = "intr", "pme";
+			fsl,pcie-scfg = <&scfg 1>;
 			#address-cells = <3>;
 			#size-cells = <2>;
 			device_type = "pci";
@@ -876,6 +878,7 @@
 			interrupts = <0 162 0x4>,
 				     <0 161 0x4>;
 			interrupt-names = "intr", "pme";
+			fsl,pcie-scfg = <&scfg 2>;
 			#address-cells = <3>;
 			#size-cells = <2>;
 			device_type = "pci";
-- 
2.17.1


^ permalink raw reply	[flat|nested] 8+ messages in thread

* [PATCHv2 7/7] PCI: layerscape: Add power management support
  2020-10-27  7:29 [PATCHv2 0/7] PCI: layerscape: Add power management support Zhiqiang Hou
                   ` (5 preceding siblings ...)
  2020-10-27  7:30 ` [PATCHv2 6/7] arm64: dts: ls1043a: Add SCFG phandle for PCIe nodes Zhiqiang Hou
@ 2020-10-27  7:30 ` Zhiqiang Hou
  6 siblings, 0 replies; 8+ messages in thread
From: Zhiqiang Hou @ 2020-10-27  7:30 UTC (permalink / raw)
  To: linux-pci, devicetree, linux-kernel, linux-arm-kernel,
	lorenzo.pieralisi, robh+dt, bhelgaas, shawnguo, leoyang.li,
	gustavo.pimentel
  Cc: minghuan.Lian, mingkai.hu, roy.zang, Hou Zhiqiang

From: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>

Add PME_Turn_Off/PME_TO_Ack handshake sequence, and finally
put the PCIe controller into D3 state after the L2/L3 ready
state transition process completion.

Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
---
V2:
 - Change to use the common defines to access the RC configuration
   registers.

 drivers/pci/controller/dwc/pci-layerscape.c  | 380 ++++++++++++++++++-
 drivers/pci/controller/dwc/pcie-designware.h |   1 +
 2 files changed, 379 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/controller/dwc/pci-layerscape.c b/drivers/pci/controller/dwc/pci-layerscape.c
index be404c16bcbe..9886eaead593 100644
--- a/drivers/pci/controller/dwc/pci-layerscape.c
+++ b/drivers/pci/controller/dwc/pci-layerscape.c
@@ -3,13 +3,16 @@
  * PCIe host controller driver for Freescale Layerscape SoCs
  *
  * Copyright (C) 2014 Freescale Semiconductor.
+ * Copyright 2020 NXP
  *
  * Author: Minghuan Lian <Minghuan.Lian@freescale.com>
  */
 
+#include <linux/delay.h>
 #include <linux/kernel.h>
 #include <linux/interrupt.h>
 #include <linux/init.h>
+#include <linux/iopoll.h>
 #include <linux/of_pci.h>
 #include <linux/of_platform.h>
 #include <linux/of_irq.h>
@@ -27,17 +30,60 @@
 #define PCIE_ABSERR		0x8d0 /* Bridge Slave Error Response Register */
 #define PCIE_ABSERR_SETTING	0x9401 /* Forward error of non-posted request */
 
+/* PF Message Command Register */
+#define LS_PCIE_PF_MCR		0x2c
+#define PF_MCR_PTOMR		BIT(0)
+#define PF_MCR_EXL2S		BIT(1)
+
+/* LS1021A PEXn PM Write Control Register */
+#define SCFG_PEXPMWRCR(idx)	(0x5c + (idx) * 0x64)
+#define PMXMTTURNOFF		BIT(31)
+#define SCFG_PEXSFTRSTCR	0x190
+#define PEXSR(idx)		BIT(idx)
+
+/* LS1043A PEX PME control register */
+#define SCFG_PEXPMECR		0x144
+#define PEXPME(idx)		BIT(31 - (idx) * 4)
+
+/* LS1043A PEX LUT debug register */
+#define LS_PCIE_LDBG	0x7fc
+#define LDBG_SR		BIT(30)
+#define LDBG_WE		BIT(31)
+
 #define PCIE_IATU_NUM		6
 
+#define LS_PCIE_IS_L2(v)	\
+	(((v) & PORT_LOGIC_LTSSM_STATE_MASK) == PORT_LOGIC_LTSSM_STATE_L2)
+
+struct ls_pcie;
+
+struct ls_pcie_host_pm_ops {
+	int (*pm_init)(struct ls_pcie *pcie);
+	void (*send_turn_off_message)(struct ls_pcie *pcie);
+	void (*exit_from_l2)(struct ls_pcie *pcie);
+};
+
 struct ls_pcie_drvdata {
+	const u32 pf_off;
+	const u32 lut_off;
 	const struct dw_pcie_host_ops *ops;
+	const struct ls_pcie_host_pm_ops *pm_ops;
 };
 
 struct ls_pcie {
 	struct dw_pcie *pci;
 	const struct ls_pcie_drvdata *drvdata;
+	void __iomem *pf_base;
+	void __iomem *lut_base;
+	bool big_endian;
+	bool ep_presence;
+	bool pm_support;
+	struct regmap *scfg;
+	int index;
 };
 
+#define ls_pcie_lut_readl_addr(addr)	ls_pcie_lut_readl(pcie, addr)
+#define ls_pcie_pf_readl_addr(addr)	ls_pcie_pf_readl(pcie, addr)
 #define to_ls_pcie(x)	dev_get_drvdata((x)->dev)
 
 static bool ls_pcie_is_bridge(struct ls_pcie *pcie)
@@ -86,6 +132,210 @@ static void ls_pcie_fix_error_response(struct ls_pcie *pcie)
 	iowrite32(PCIE_ABSERR_SETTING, pci->dbi_base + PCIE_ABSERR);
 }
 
+static u32 ls_pcie_lut_readl(struct ls_pcie *pcie, u32 off)
+{
+	if (pcie->big_endian)
+		return ioread32be(pcie->lut_base + off);
+
+	return ioread32(pcie->lut_base + off);
+}
+
+static void ls_pcie_lut_writel(struct ls_pcie *pcie, u32 off, u32 val)
+{
+	if (pcie->big_endian)
+		return iowrite32be(val, pcie->lut_base + off);
+
+	return iowrite32(val, pcie->lut_base + off);
+
+}
+
+static u32 ls_pcie_pf_readl(struct ls_pcie *pcie, u32 off)
+{
+	if (pcie->big_endian)
+		return ioread32be(pcie->pf_base + off);
+
+	return ioread32(pcie->pf_base + off);
+}
+
+static void ls_pcie_pf_writel(struct ls_pcie *pcie, u32 off, u32 val)
+{
+	if (pcie->big_endian)
+		return iowrite32be(val, pcie->pf_base + off);
+
+	return iowrite32(val, pcie->pf_base + off);
+
+}
+
+static void ls_pcie_send_turnoff_msg(struct ls_pcie *pcie)
+{
+	u32 val;
+	int ret;
+
+	val = ls_pcie_pf_readl(pcie, LS_PCIE_PF_MCR);
+	val |= PF_MCR_PTOMR;
+	ls_pcie_pf_writel(pcie, LS_PCIE_PF_MCR, val);
+
+	ret = readx_poll_timeout(ls_pcie_pf_readl_addr, LS_PCIE_PF_MCR,
+				 val, !(val & PF_MCR_PTOMR), 100, 10000);
+	if (ret)
+		dev_info(pcie->pci->dev, "poll turn off message timeout\n");
+}
+
+static void ls1021a_pcie_send_turnoff_msg(struct ls_pcie *pcie)
+{
+	u32 val;
+
+	if (!pcie->scfg) {
+		dev_dbg(pcie->pci->dev, "SYSCFG is NULL\n");
+		return;
+	}
+
+	/* Send Turn_off message */
+	regmap_read(pcie->scfg, SCFG_PEXPMWRCR(pcie->index), &val);
+	val |= PMXMTTURNOFF;
+	regmap_write(pcie->scfg, SCFG_PEXPMWRCR(pcie->index), val);
+
+	mdelay(10);
+
+	/* Clear Turn_off message */
+	regmap_read(pcie->scfg, SCFG_PEXPMWRCR(pcie->index), &val);
+	val &= ~PMXMTTURNOFF;
+	regmap_write(pcie->scfg, SCFG_PEXPMWRCR(pcie->index), val);
+}
+
+static void ls1043a_pcie_send_turnoff_msg(struct ls_pcie *pcie)
+{
+	u32 val;
+
+	if (!pcie->scfg) {
+		dev_dbg(pcie->pci->dev, "SYSCFG is NULL\n");
+		return;
+	}
+
+	/* Send Turn_off message */
+	regmap_read(pcie->scfg, SCFG_PEXPMECR, &val);
+	val |= PEXPME(pcie->index);
+	regmap_write(pcie->scfg, SCFG_PEXPMECR, val);
+
+	mdelay(10);
+
+	/* Clear Turn_off message */
+	regmap_read(pcie->scfg, SCFG_PEXPMECR, &val);
+	val &= ~PEXPME(pcie->index);
+	regmap_write(pcie->scfg, SCFG_PEXPMECR, val);
+}
+
+static void ls_pcie_exit_from_l2(struct ls_pcie *pcie)
+{
+	u32 val;
+	int ret;
+
+	val = ls_pcie_pf_readl(pcie, LS_PCIE_PF_MCR);
+	val |= PF_MCR_EXL2S;
+	ls_pcie_pf_writel(pcie, LS_PCIE_PF_MCR, val);
+
+	ret = readx_poll_timeout(ls_pcie_pf_readl_addr, LS_PCIE_PF_MCR,
+				 val, !(val & PF_MCR_EXL2S), 100, 10000);
+	if (ret)
+		dev_info(pcie->pci->dev, "poll exit L2 state timeout\n");
+}
+
+static void ls_pcie_retrain_link(struct ls_pcie *pcie)
+{
+	struct dw_pcie *pci = pcie->pci;
+	u8 offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP);
+	u32 val;
+
+	val = dw_pcie_readw_dbi(pci, offset + PCI_EXP_LNKCTL);
+	val |= PCI_EXP_LNKCTL_RL;
+	dw_pcie_writew_dbi(pci, offset + PCI_EXP_LNKCTL, val);
+}
+
+static void ls1021a_pcie_exit_from_l2(struct ls_pcie *pcie)
+{
+	u32 val;
+
+	regmap_read(pcie->scfg, SCFG_PEXSFTRSTCR, &val);
+	val |= PEXSR(pcie->index);
+	regmap_write(pcie->scfg, SCFG_PEXSFTRSTCR, val);
+
+	regmap_read(pcie->scfg, SCFG_PEXSFTRSTCR, &val);
+	val &= ~PEXSR(pcie->index);
+	regmap_write(pcie->scfg, SCFG_PEXSFTRSTCR, val);
+
+	mdelay(1);
+
+	ls_pcie_retrain_link(pcie);
+}
+static void ls1043a_pcie_exit_from_l2(struct ls_pcie *pcie)
+{
+	u32 val;
+
+	val = ls_pcie_lut_readl(pcie, LS_PCIE_LDBG);
+	val |= LDBG_WE;
+	ls_pcie_lut_writel(pcie, LS_PCIE_LDBG, val);
+
+	val = ls_pcie_lut_readl(pcie, LS_PCIE_LDBG);
+	val |= LDBG_SR;
+	ls_pcie_lut_writel(pcie, LS_PCIE_LDBG, val);
+
+	val = ls_pcie_lut_readl(pcie, LS_PCIE_LDBG);
+	val &= ~LDBG_SR;
+	ls_pcie_lut_writel(pcie, LS_PCIE_LDBG, val);
+
+	val = ls_pcie_lut_readl(pcie, LS_PCIE_LDBG);
+	val &= ~LDBG_WE;
+	ls_pcie_lut_writel(pcie, LS_PCIE_LDBG, val);
+
+	mdelay(1);
+
+	ls_pcie_retrain_link(pcie);
+}
+
+static int ls1021a_pcie_pm_init(struct ls_pcie *pcie)
+{
+	struct device *dev = pcie->pci->dev;
+	u32 index[2];
+	int ret;
+
+	pcie->scfg = syscon_regmap_lookup_by_phandle(dev->of_node,
+						     "fsl,pcie-scfg");
+	if (IS_ERR(pcie->scfg)) {
+		ret = PTR_ERR(pcie->scfg);
+		dev_err(dev, "No syscfg phandle specified\n");
+		pcie->scfg = NULL;
+		return ret;
+	}
+
+	ret = of_property_read_u32_array(dev->of_node, "fsl,pcie-scfg",
+					 index, 2);
+	if (ret) {
+		pcie->scfg = NULL;
+		return ret;
+	}
+
+	pcie->index = index[1];
+
+	return 0;
+}
+
+static int ls_pcie_pm_init(struct ls_pcie *pcie)
+{
+	return 0;
+}
+
+static void ls_pcie_set_dstate(struct ls_pcie *pcie, u32 dstate)
+{
+	struct dw_pcie *pci = pcie->pci;
+	u8 offset = dw_pcie_find_capability(pci, PCI_CAP_ID_PM);
+	u32 val;
+
+	val = dw_pcie_readw_dbi(pci, offset + PCI_PM_CTRL);
+	val &= ~PCI_PM_CTRL_STATE_MASK;
+	val |= dstate;
+	dw_pcie_writew_dbi(pci, offset + PCI_PM_CTRL, val);
+}
+
 static int ls_pcie_host_init(struct pcie_port *pp)
 {
 	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
@@ -133,20 +383,52 @@ static int ls_pcie_msi_host_init(struct pcie_port *pp)
 	return 0;
 }
 
+static struct ls_pcie_host_pm_ops ls1021a_pcie_host_pm_ops = {
+	.pm_init = &ls1021a_pcie_pm_init,
+	.send_turn_off_message = &ls1021a_pcie_send_turnoff_msg,
+	.exit_from_l2 = &ls1021a_pcie_exit_from_l2,
+};
+
+static struct ls_pcie_host_pm_ops ls1043a_pcie_host_pm_ops = {
+	.pm_init = &ls1021a_pcie_pm_init,
+	.send_turn_off_message = &ls1043a_pcie_send_turnoff_msg,
+	.exit_from_l2 = &ls1043a_pcie_exit_from_l2,
+};
+
+static struct ls_pcie_host_pm_ops ls_pcie_host_pm_ops = {
+	.pm_init = &ls_pcie_pm_init,
+	.send_turn_off_message = &ls_pcie_send_turnoff_msg,
+	.exit_from_l2 = &ls_pcie_exit_from_l2,
+};
+
 static const struct dw_pcie_host_ops ls_pcie_host_ops = {
 	.host_init = ls_pcie_host_init,
 	.msi_host_init = ls_pcie_msi_host_init,
 };
 
+static const struct ls_pcie_drvdata ls1021a_drvdata = {
+	.ops = &ls_pcie_host_ops,
+	.pm_ops = &ls1021a_pcie_host_pm_ops,
+};
+
+static const struct ls_pcie_drvdata ls1043a_drvdata = {
+	.ops = &ls_pcie_host_ops,
+	.lut_off = 0x10000,
+	.pm_ops = &ls1043a_pcie_host_pm_ops,
+};
+
 static const struct ls_pcie_drvdata layerscape_drvdata = {
 	.ops = &ls_pcie_host_ops,
+	.lut_off = 0x80000,
+	.pf_off = 0xc0000,
+	.pm_ops = &ls_pcie_host_pm_ops,
 };
 
 static const struct of_device_id ls_pcie_of_match[] = {
 	{ .compatible = "fsl,ls1012a-pcie", .data = &layerscape_drvdata },
-	{ .compatible = "fsl,ls1021a-pcie", .data = &layerscape_drvdata },
+	{ .compatible = "fsl,ls1021a-pcie", .data = &ls1021a_drvdata },
 	{ .compatible = "fsl,ls1028a-pcie", .data = &layerscape_drvdata },
-	{ .compatible = "fsl,ls1043a-pcie", .data = &layerscape_drvdata },
+	{ .compatible = "fsl,ls1043a-pcie", .data = &ls1043a_drvdata },
 	{ .compatible = "fsl,ls1046a-pcie", .data = &layerscape_drvdata },
 	{ .compatible = "fsl,ls2080a-pcie", .data = &layerscape_drvdata },
 	{ .compatible = "fsl,ls2085a-pcie", .data = &layerscape_drvdata },
@@ -170,6 +452,15 @@ static int __init ls_add_pcie_port(struct ls_pcie *pcie)
 		return ret;
 	}
 
+	if (dw_pcie_link_up(pci)) {
+		dev_dbg(pci->dev, "Endpoint is present\n");
+		pcie->ep_presence = true;
+	}
+
+	if (pcie->drvdata->pm_ops && pcie->drvdata->pm_ops->pm_init &&
+	    !pcie->drvdata->pm_ops->pm_init(pcie))
+		pcie->pm_support = true;
+
 	return 0;
 }
 
@@ -200,6 +491,14 @@ static int __init ls_pcie_probe(struct platform_device *pdev)
 	if (IS_ERR(pci->dbi_base))
 		return PTR_ERR(pci->dbi_base);
 
+	pcie->big_endian = of_property_read_bool(dev->of_node, "big-endian");
+
+	if (pcie->drvdata->lut_off)
+		pcie->lut_base = pci->dbi_base + pcie->drvdata->lut_off;
+
+	if (pcie->drvdata->pf_off)
+		pcie->pf_base = pci->dbi_base + pcie->drvdata->pf_off;
+
 	if (!ls_pcie_is_bridge(pcie))
 		return -ENODEV;
 
@@ -212,11 +511,88 @@ static int __init ls_pcie_probe(struct platform_device *pdev)
 	return 0;
 }
 
+static bool ls_pcie_pm_check(struct ls_pcie *pcie)
+{
+	if (!pcie->ep_presence) {
+		dev_dbg(pcie->pci->dev, "Endpoint isn't present\n");
+		return false;
+	}
+
+	if (!pcie->pm_support)
+		return false;
+
+	return true;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int ls_pcie_suspend_noirq(struct device *dev)
+{
+	struct ls_pcie *pcie = dev_get_drvdata(dev);
+	struct dw_pcie *pci = pcie->pci;
+	u32 val;
+	int ret;
+
+	if (!ls_pcie_pm_check(pcie))
+		return 0;
+
+	pcie->drvdata->pm_ops->send_turn_off_message(pcie);
+
+	/* 10ms timeout to check L2 ready */
+	ret = readl_poll_timeout(pci->dbi_base + PCIE_PORT_DEBUG0,
+				 val, LS_PCIE_IS_L2(val), 100, 10000);
+	if (ret) {
+		dev_err(dev, "PCIe link enter L2 timeout! ltssm = 0x%x\n", val);
+		return ret;
+	}
+
+	ls_pcie_set_dstate(pcie, 0x3);
+
+	return 0;
+}
+
+static int ls_pcie_resume_noirq(struct device *dev)
+{
+	struct ls_pcie *pcie = dev_get_drvdata(dev);
+	struct dw_pcie *pci = pcie->pci;
+	int ret;
+
+	if (!ls_pcie_pm_check(pcie))
+		return 0;
+
+	ls_pcie_set_dstate(pcie, 0x0);
+
+	pcie->drvdata->pm_ops->exit_from_l2(pcie);
+
+	/* delay 10ms to access EP */
+	mdelay(10);
+
+	ret = ls_pcie_host_init(&pci->pp);
+	if (ret) {
+		dev_err(dev, "ls_pcie_host_init failed! ret = 0x%x\n", ret);
+		return ret;
+	}
+
+	ret = dw_pcie_wait_for_link(pci);
+	if (ret) {
+		dev_err(dev, "wait link up timeout! ret = 0x%x\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+#endif /* CONFIG_PM_SLEEP */
+
+static const struct dev_pm_ops ls_pcie_pm_ops = {
+	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(ls_pcie_suspend_noirq,
+				      ls_pcie_resume_noirq)
+};
+
 static struct platform_driver ls_pcie_driver = {
 	.driver = {
 		.name = "layerscape-pcie",
 		.of_match_table = ls_pcie_of_match,
 		.suppress_bind_attrs = true,
+		.pm = &ls_pcie_pm_ops,
 	},
 };
 builtin_platform_driver_probe(ls_pcie_driver, ls_pcie_probe);
diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index 9d2f511f13fa..0d863f525057 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -54,6 +54,7 @@
 #define PCIE_PORT_DEBUG0		0x728
 #define PORT_LOGIC_LTSSM_STATE_MASK	0x1f
 #define PORT_LOGIC_LTSSM_STATE_L0	0x11
+#define PORT_LOGIC_LTSSM_STATE_L2	0x15
 #define PCIE_PORT_DEBUG1		0x72C
 #define PCIE_PORT_DEBUG1_LINK_UP		BIT(4)
 #define PCIE_PORT_DEBUG1_LINK_IN_TRAINING	BIT(29)
-- 
2.17.1


^ permalink raw reply	[flat|nested] 8+ messages in thread

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Thread overview: 8+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-10-27  7:29 [PATCHv2 0/7] PCI: layerscape: Add power management support Zhiqiang Hou
2020-10-27  7:29 ` [PATCHv2 1/7] PCI: dwc: Fix a bug of the case dw_pci->ops is NULL Zhiqiang Hou
2020-10-27  7:29 ` [PATCHv2 2/7] PCI: layerscape: Change to use the DWC common link-up check function Zhiqiang Hou
2020-10-27  7:29 ` [PATCHv2 3/7] dt-bindings: pci: layerscape-pci: Add a optional property big-endian Zhiqiang Hou
2020-10-27  7:29 ` [PATCHv2 4/7] arm64: dts: layerscape: Add big-endian property for PCIe nodes Zhiqiang Hou
2020-10-27  7:29 ` [PATCHv2 5/7] dt-bindings: pci: layerscape-pci: Update the description of SCFG property Zhiqiang Hou
2020-10-27  7:30 ` [PATCHv2 6/7] arm64: dts: ls1043a: Add SCFG phandle for PCIe nodes Zhiqiang Hou
2020-10-27  7:30 ` [PATCHv2 7/7] PCI: layerscape: Add power management support Zhiqiang Hou

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