* [PATCH v9 1/2] dt-bindings: rockchip: Add DesignWare based PCIe controller
@ 2021-05-06 2:34 ` Simon Xue
0 siblings, 0 replies; 16+ messages in thread
From: Simon Xue @ 2021-05-06 2:34 UTC (permalink / raw)
To: Bjorn Helgaas, Lorenzo Pieralisi
Cc: linux-pci, linux-rockchip, devicetree, robh+dt, Johan Jonker,
Heiko Stuebner, Simon Xue, Rob Herring, Kever Yang
Document DT bindings for PCIe controller found on Rockchip SoC.
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
Signed-off-by: Simon Xue <xxm@rock-chips.com>
---
.../bindings/pci/rockchip-dw-pcie.yaml | 141 ++++++++++++++++++
1 file changed, 141 insertions(+)
create mode 100644 Documentation/devicetree/bindings/pci/rockchip-dw-pcie.yaml
diff --git a/Documentation/devicetree/bindings/pci/rockchip-dw-pcie.yaml b/Documentation/devicetree/bindings/pci/rockchip-dw-pcie.yaml
new file mode 100644
index 000000000000..142bbe577763
--- /dev/null
+++ b/Documentation/devicetree/bindings/pci/rockchip-dw-pcie.yaml
@@ -0,0 +1,141 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pci/rockchip-dw-pcie.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: DesignWare based PCIe controller on Rockchip SoCs
+
+maintainers:
+ - Shawn Lin <shawn.lin@rock-chips.com>
+ - Simon Xue <xxm@rock-chips.com>
+ - Heiko Stuebner <heiko@sntech.de>
+
+description: |+
+ RK3568 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#
+
+# We need a select here so we don't match all nodes with 'snps,dw-pcie'
+select:
+ properties:
+ compatible:
+ contains:
+ const: rockchip,rk3568-pcie
+ required:
+ - compatible
+
+properties:
+ compatible:
+ items:
+ - const: rockchip,rk3568-pcie
+ - const: snps,dw-pcie
+
+ reg:
+ items:
+ - description: Data Bus Interface (DBI) registers
+ - description: Rockchip designed configuration registers
+ - description: Config registers
+
+ reg-names:
+ items:
+ - const: dbi
+ - const: apb
+ - const: config
+
+ clocks:
+ items:
+ - description: AHB clock for PCIe master
+ - description: AHB clock for PCIe slave
+ - description: AHB clock for PCIe dbi
+ - description: APB clock for PCIe
+ - description: Auxiliary clock for PCIe
+
+ clock-names:
+ items:
+ - const: aclk_mst
+ - const: aclk_slv
+ - const: aclk_dbi
+ - const: pclk
+ - const: aux
+
+ msi-map: true
+
+ num-lanes: true
+
+ phys:
+ maxItems: 1
+
+ phy-names:
+ const: pcie-phy
+
+ power-domains:
+ maxItems: 1
+
+ ranges:
+ maxItems: 2
+
+ resets:
+ maxItems: 1
+
+ reset-names:
+ const: pipe
+
+ vpcie3v3-supply: true
+
+required:
+ - compatible
+ - reg
+ - reg-names
+ - clocks
+ - clock-names
+ - msi-map
+ - num-lanes
+ - phys
+ - phy-names
+ - power-domains
+ - resets
+ - reset-names
+
+unevaluatedProperties: false
+
+examples:
+ - |
+
+ bus {
+ #address-cells = <2>;
+ #size-cells = <2>;
+
+ pcie3x2: pcie@fe280000 {
+ compatible = "rockchip,rk3568-pcie", "snps,dw-pcie";
+ reg = <0x3 0xc0800000 0x0 0x390000>,
+ <0x0 0xfe280000 0x0 0x10000>,
+ <0x3 0x80000000 0x0 0x100000>;
+ reg-names = "dbi", "apb", "config";
+ bus-range = <0x20 0x2f>;
+ clocks = <&cru 143>, <&cru 144>,
+ <&cru 145>, <&cru 146>,
+ <&cru 147>;
+ clock-names = "aclk_mst", "aclk_slv",
+ "aclk_dbi", "pclk",
+ "aux";
+ device_type = "pci";
+ linux,pci-domain = <2>;
+ max-link-speed = <2>;
+ msi-map = <0x2000 &its 0x2000 0x1000>;
+ num-lanes = <2>;
+ phys = <&pcie30phy>;
+ phy-names = "pcie-phy";
+ power-domains = <&power 15>;
+ ranges = <0x81000000 0x0 0x80800000 0x3 0x80800000 0x0 0x100000>,
+ <0x83000000 0x0 0x80900000 0x3 0x80900000 0x0 0x3f700000>;
+ resets = <&cru 193>;
+ reset-names = "pipe";
+ #address-cells = <3>;
+ #size-cells = <2>;
+ };
+ };
+...
--
2.25.1
^ permalink raw reply related [flat|nested] 16+ messages in thread
* [PATCH v9 1/2] dt-bindings: rockchip: Add DesignWare based PCIe controller
@ 2021-05-06 2:34 ` Simon Xue
0 siblings, 0 replies; 16+ messages in thread
From: Simon Xue @ 2021-05-06 2:34 UTC (permalink / raw)
To: Bjorn Helgaas, Lorenzo Pieralisi
Cc: linux-pci, linux-rockchip, devicetree, robh+dt, Johan Jonker,
Heiko Stuebner, Simon Xue, Rob Herring, Kever Yang
Document DT bindings for PCIe controller found on Rockchip SoC.
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
Signed-off-by: Simon Xue <xxm@rock-chips.com>
---
.../bindings/pci/rockchip-dw-pcie.yaml | 141 ++++++++++++++++++
1 file changed, 141 insertions(+)
create mode 100644 Documentation/devicetree/bindings/pci/rockchip-dw-pcie.yaml
diff --git a/Documentation/devicetree/bindings/pci/rockchip-dw-pcie.yaml b/Documentation/devicetree/bindings/pci/rockchip-dw-pcie.yaml
new file mode 100644
index 000000000000..142bbe577763
--- /dev/null
+++ b/Documentation/devicetree/bindings/pci/rockchip-dw-pcie.yaml
@@ -0,0 +1,141 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pci/rockchip-dw-pcie.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: DesignWare based PCIe controller on Rockchip SoCs
+
+maintainers:
+ - Shawn Lin <shawn.lin@rock-chips.com>
+ - Simon Xue <xxm@rock-chips.com>
+ - Heiko Stuebner <heiko@sntech.de>
+
+description: |+
+ RK3568 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#
+
+# We need a select here so we don't match all nodes with 'snps,dw-pcie'
+select:
+ properties:
+ compatible:
+ contains:
+ const: rockchip,rk3568-pcie
+ required:
+ - compatible
+
+properties:
+ compatible:
+ items:
+ - const: rockchip,rk3568-pcie
+ - const: snps,dw-pcie
+
+ reg:
+ items:
+ - description: Data Bus Interface (DBI) registers
+ - description: Rockchip designed configuration registers
+ - description: Config registers
+
+ reg-names:
+ items:
+ - const: dbi
+ - const: apb
+ - const: config
+
+ clocks:
+ items:
+ - description: AHB clock for PCIe master
+ - description: AHB clock for PCIe slave
+ - description: AHB clock for PCIe dbi
+ - description: APB clock for PCIe
+ - description: Auxiliary clock for PCIe
+
+ clock-names:
+ items:
+ - const: aclk_mst
+ - const: aclk_slv
+ - const: aclk_dbi
+ - const: pclk
+ - const: aux
+
+ msi-map: true
+
+ num-lanes: true
+
+ phys:
+ maxItems: 1
+
+ phy-names:
+ const: pcie-phy
+
+ power-domains:
+ maxItems: 1
+
+ ranges:
+ maxItems: 2
+
+ resets:
+ maxItems: 1
+
+ reset-names:
+ const: pipe
+
+ vpcie3v3-supply: true
+
+required:
+ - compatible
+ - reg
+ - reg-names
+ - clocks
+ - clock-names
+ - msi-map
+ - num-lanes
+ - phys
+ - phy-names
+ - power-domains
+ - resets
+ - reset-names
+
+unevaluatedProperties: false
+
+examples:
+ - |
+
+ bus {
+ #address-cells = <2>;
+ #size-cells = <2>;
+
+ pcie3x2: pcie@fe280000 {
+ compatible = "rockchip,rk3568-pcie", "snps,dw-pcie";
+ reg = <0x3 0xc0800000 0x0 0x390000>,
+ <0x0 0xfe280000 0x0 0x10000>,
+ <0x3 0x80000000 0x0 0x100000>;
+ reg-names = "dbi", "apb", "config";
+ bus-range = <0x20 0x2f>;
+ clocks = <&cru 143>, <&cru 144>,
+ <&cru 145>, <&cru 146>,
+ <&cru 147>;
+ clock-names = "aclk_mst", "aclk_slv",
+ "aclk_dbi", "pclk",
+ "aux";
+ device_type = "pci";
+ linux,pci-domain = <2>;
+ max-link-speed = <2>;
+ msi-map = <0x2000 &its 0x2000 0x1000>;
+ num-lanes = <2>;
+ phys = <&pcie30phy>;
+ phy-names = "pcie-phy";
+ power-domains = <&power 15>;
+ ranges = <0x81000000 0x0 0x80800000 0x3 0x80800000 0x0 0x100000>,
+ <0x83000000 0x0 0x80900000 0x3 0x80900000 0x0 0x3f700000>;
+ resets = <&cru 193>;
+ reset-names = "pipe";
+ #address-cells = <3>;
+ #size-cells = <2>;
+ };
+ };
+...
--
2.25.1
_______________________________________________
Linux-rockchip mailing list
Linux-rockchip@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-rockchip
^ permalink raw reply related [flat|nested] 16+ messages in thread
* [PATCH v9 2/2] PCI: rockchip: Add Rockchip RK356X host controller driver
2021-05-06 2:34 ` Simon Xue
@ 2021-05-06 2:35 ` Simon Xue
-1 siblings, 0 replies; 16+ messages in thread
From: Simon Xue @ 2021-05-06 2:35 UTC (permalink / raw)
To: Bjorn Helgaas, Lorenzo Pieralisi
Cc: linux-pci, linux-rockchip, devicetree, robh+dt, Johan Jonker,
Heiko Stuebner, Simon Xue, Peter Geis, Kever Yang,
kernel test robot, Shawn Lin
Add a driver for the DesignWare-based PCIe controller found on
RK356X. The existing pcie-rockchip-host driver is only used for
the Rockchip-designed IP found on RK3399.
Tested-by: Peter Geis <pgwipeout@gmail.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Simon Xue <xxm@rock-chips.com>
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
---
drivers/pci/controller/dwc/Kconfig | 11 +
drivers/pci/controller/dwc/Makefile | 1 +
drivers/pci/controller/dwc/pcie-dw-rockchip.c | 277 ++++++++++++++++++
3 files changed, 289 insertions(+)
create mode 100644 drivers/pci/controller/dwc/pcie-dw-rockchip.c
diff --git a/drivers/pci/controller/dwc/Kconfig b/drivers/pci/controller/dwc/Kconfig
index 423d35872ce4..60d3dde9ca39 100644
--- a/drivers/pci/controller/dwc/Kconfig
+++ b/drivers/pci/controller/dwc/Kconfig
@@ -214,6 +214,17 @@ config PCIE_ARTPEC6_EP
Enables support for the PCIe controller in the ARTPEC-6 SoC to work in
endpoint mode. This uses the DesignWare core.
+config PCIE_ROCKCHIP_DW_HOST
+ bool "Rockchip DesignWare PCIe controller"
+ select PCIE_DW
+ select PCIE_DW_HOST
+ depends on PCI_MSI_IRQ_DOMAIN
+ depends on ARCH_ROCKCHIP || COMPILE_TEST
+ depends on OF
+ help
+ Enables support for the DesignWare PCIe controller in the
+ Rockchip SoC except RK3399.
+
config PCIE_INTEL_GW
bool "Intel Gateway PCIe host controller support"
depends on OF && (X86 || COMPILE_TEST)
diff --git a/drivers/pci/controller/dwc/Makefile b/drivers/pci/controller/dwc/Makefile
index eca805c1a023..689b06a7d334 100644
--- a/drivers/pci/controller/dwc/Makefile
+++ b/drivers/pci/controller/dwc/Makefile
@@ -14,6 +14,7 @@ obj-$(CONFIG_PCI_LAYERSCAPE_EP) += pci-layerscape-ep.o
obj-$(CONFIG_PCIE_QCOM) += pcie-qcom.o
obj-$(CONFIG_PCIE_ARMADA_8K) += pcie-armada8k.o
obj-$(CONFIG_PCIE_ARTPEC6) += pcie-artpec6.o
+obj-$(CONFIG_PCIE_ROCKCHIP_DW_HOST) += pcie-dw-rockchip.o
obj-$(CONFIG_PCIE_INTEL_GW) += pcie-intel-gw.o
obj-$(CONFIG_PCIE_KIRIN) += pcie-kirin.o
obj-$(CONFIG_PCIE_HISI_STB) += pcie-histb.o
diff --git a/drivers/pci/controller/dwc/pcie-dw-rockchip.c b/drivers/pci/controller/dwc/pcie-dw-rockchip.c
new file mode 100644
index 000000000000..3f060144eeab
--- /dev/null
+++ b/drivers/pci/controller/dwc/pcie-dw-rockchip.c
@@ -0,0 +1,277 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * PCIe host controller driver for Rockchip SoCs.
+ *
+ * Copyright (C) 2021 Rockchip Electronics Co., Ltd.
+ * http://www.rock-chips.com
+ *
+ * Author: Simon Xue <xxm@rock-chips.com>
+ */
+
+#include <linux/clk.h>
+#include <linux/gpio/consumer.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/reset.h>
+
+#include "pcie-designware.h"
+
+/*
+ * The upper 16 bits of PCIE_CLIENT_CONFIG are a write
+ * mask for the lower 16 bits.
+ */
+#define HIWORD_UPDATE(mask, val) (((mask) << 16) | (val))
+#define HIWORD_UPDATE_BIT(val) HIWORD_UPDATE(val, val)
+
+#define to_rockchip_pcie(x) dev_get_drvdata((x)->dev)
+
+#define PCIE_CLIENT_RC_MODE HIWORD_UPDATE_BIT(0x40)
+#define PCIE_CLIENT_ENABLE_LTSSM HIWORD_UPDATE_BIT(0xc)
+#define PCIE_SMLH_LINKUP BIT(16)
+#define PCIE_RDLH_LINKUP BIT(17)
+#define PCIE_LINKUP (PCIE_SMLH_LINKUP | PCIE_RDLH_LINKUP)
+#define PCIE_L0S_ENTRY 0x11
+#define PCIE_CLIENT_GENERAL_CONTROL 0x0
+#define PCIE_CLIENT_GENERAL_DEBUG 0x104
+#define PCIE_CLIENT_HOT_RESET_CTRL 0x180
+#define PCIE_CLIENT_LTSSM_STATUS 0x300
+#define PCIE_LTSSM_ENABLE_ENHANCE BIT(4)
+
+struct rockchip_pcie {
+ struct dw_pcie pci;
+ void __iomem *apb_base;
+ struct phy *phy;
+ struct clk_bulk_data *clks;
+ unsigned int clk_cnt;
+ struct reset_control *rst;
+ struct gpio_desc *rst_gpio;
+ struct regulator *vpcie3v3;
+};
+
+static int rockchip_pcie_readl_apb(struct rockchip_pcie *rockchip,
+ u32 reg)
+{
+ return readl(rockchip->apb_base + reg);
+}
+
+static void rockchip_pcie_writel_apb(struct rockchip_pcie *rockchip,
+ u32 val, u32 reg)
+{
+ writel(val, rockchip->apb_base + reg);
+}
+
+static void rockchip_pcie_enable_ltssm(struct rockchip_pcie *rockchip)
+{
+ rockchip_pcie_writel_apb(rockchip, PCIE_CLIENT_ENABLE_LTSSM,
+ PCIE_CLIENT_GENERAL_CONTROL);
+}
+
+static int rockchip_pcie_link_up(struct dw_pcie *pci)
+{
+ struct rockchip_pcie *rockchip = to_rockchip_pcie(pci);
+ u32 val = rockchip_pcie_readl_apb(rockchip, PCIE_CLIENT_LTSSM_STATUS);
+
+ if ((val & (PCIE_RDLH_LINKUP | PCIE_SMLH_LINKUP)) == PCIE_LINKUP &&
+ (val & GENMASK(5, 0)) == PCIE_L0S_ENTRY)
+ return 1;
+
+ return 0;
+}
+
+static int rockchip_pcie_start_link(struct dw_pcie *pci)
+{
+ struct rockchip_pcie *rockchip = to_rockchip_pcie(pci);
+
+ /* Reset device */
+ gpiod_set_value_cansleep(rockchip->rst_gpio, 0);
+
+ rockchip_pcie_enable_ltssm(rockchip);
+
+ /*
+ * PCIe requires the refclk to be stable for 100µs prior to releasing
+ * PERST. See table 2-4 in section 2.6.2 AC Specifications of the PCI
+ * Express Card Electromechanical Specification, 1.1. However, we don't
+ * know if the refclk is coming from RC's PHY or external OSC. If it's
+ * from RC, so enabling LTSSM is the just right place to release #PERST.
+ * We need more extra time as before, rather than setting just
+ * 100us as we don't know how long should the device need to reset.
+ */
+ msleep(100);
+ gpiod_set_value_cansleep(rockchip->rst_gpio, 1);
+
+ return 0;
+}
+
+static int rockchip_pcie_host_init(struct pcie_port *pp)
+{
+ struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
+ struct rockchip_pcie *rockchip = to_rockchip_pcie(pci);
+ u32 val;
+
+ /* LTSSM enable control mode */
+ val = rockchip_pcie_readl_apb(rockchip, PCIE_CLIENT_HOT_RESET_CTRL);
+ val |= PCIE_LTSSM_ENABLE_ENHANCE | (PCIE_LTSSM_ENABLE_ENHANCE << 16);
+ rockchip_pcie_writel_apb(rockchip, val, PCIE_CLIENT_HOT_RESET_CTRL);
+
+ rockchip_pcie_writel_apb(rockchip, PCIE_CLIENT_RC_MODE,
+ PCIE_CLIENT_GENERAL_CONTROL);
+
+ return 0;
+}
+
+static const struct dw_pcie_host_ops rockchip_pcie_host_ops = {
+ .host_init = rockchip_pcie_host_init,
+};
+
+static int rockchip_pcie_clk_init(struct rockchip_pcie *rockchip)
+{
+ struct device *dev = rockchip->pci.dev;
+ int ret;
+
+ ret = devm_clk_bulk_get_all(dev, &rockchip->clks);
+ if (ret < 0)
+ return ret;
+
+ rockchip->clk_cnt = ret;
+
+ return clk_bulk_prepare_enable(rockchip->clk_cnt, rockchip->clks);
+}
+
+static int rockchip_pcie_resource_get(struct platform_device *pdev,
+ struct rockchip_pcie *rockchip)
+{
+ rockchip->apb_base = devm_platform_ioremap_resource_byname(pdev, "apb");
+ if (IS_ERR(rockchip->apb_base))
+ return PTR_ERR(rockchip->apb_base);
+
+ rockchip->rst_gpio = devm_gpiod_get_optional(&pdev->dev, "reset",
+ GPIOD_OUT_HIGH);
+ if (IS_ERR(rockchip->rst_gpio))
+ return PTR_ERR(rockchip->rst_gpio);
+
+ return 0;
+}
+
+static int rockchip_pcie_phy_init(struct rockchip_pcie *rockchip)
+{
+ struct device *dev = rockchip->pci.dev;
+ int ret;
+
+ rockchip->phy = devm_phy_get(dev, "pcie-phy");
+ if (IS_ERR(rockchip->phy))
+ return dev_err_probe(dev, PTR_ERR(rockchip->phy),
+ "missing PHY\n");
+
+ ret = phy_init(rockchip->phy);
+ if (ret < 0)
+ return ret;
+
+ ret = phy_power_on(rockchip->phy);
+ if (ret)
+ phy_exit(rockchip->phy);
+
+ return ret;
+}
+
+static void rockchip_pcie_phy_deinit(struct rockchip_pcie *rockchip)
+{
+ phy_exit(rockchip->phy);
+ phy_power_off(rockchip->phy);
+}
+
+static int rockchip_pcie_reset_control_release(struct rockchip_pcie *rockchip)
+{
+ struct device *dev = rockchip->pci.dev;
+
+ rockchip->rst = devm_reset_control_array_get_exclusive(dev);
+ if (IS_ERR(rockchip->rst))
+ return dev_err_probe(dev, PTR_ERR(rockchip->rst),
+ "failed to get reset lines\n");
+
+ return reset_control_deassert(rockchip->rst);
+}
+
+static const struct dw_pcie_ops dw_pcie_ops = {
+ .link_up = rockchip_pcie_link_up,
+ .start_link = rockchip_pcie_start_link,
+};
+
+static int rockchip_pcie_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct rockchip_pcie *rockchip;
+ struct pcie_port *pp;
+ int ret;
+
+ rockchip = devm_kzalloc(dev, sizeof(*rockchip), GFP_KERNEL);
+ if (!rockchip)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, rockchip);
+
+ rockchip->pci.dev = dev;
+ rockchip->pci.ops = &dw_pcie_ops;
+
+ pp = &rockchip->pci.pp;
+ pp->ops = &rockchip_pcie_host_ops;
+
+ ret = rockchip_pcie_resource_get(pdev, rockchip);
+ if (ret)
+ return ret;
+
+ /* DON'T MOVE ME: must be enable before PHY init */
+ rockchip->vpcie3v3 = devm_regulator_get_optional(dev, "vpcie3v3");
+ if (IS_ERR(rockchip->vpcie3v3))
+ if (PTR_ERR(rockchip->vpcie3v3) != -ENODEV)
+ return dev_err_probe(dev, PTR_ERR(rockchip->vpcie3v3),
+ "failed to get vpcie3v3 regulator\n");
+
+ ret = regulator_enable(rockchip->vpcie3v3);
+ if (ret) {
+ dev_err(dev, "failed to enable vpcie3v3 regulator\n");
+ return ret;
+ }
+
+ ret = rockchip_pcie_phy_init(rockchip);
+ if (ret)
+ goto disable_regulator;
+
+ ret = rockchip_pcie_reset_control_release(rockchip);
+ if (ret)
+ goto deinit_phy;
+
+ ret = rockchip_pcie_clk_init(rockchip);
+ if (ret)
+ goto deinit_phy;
+
+ ret = dw_pcie_host_init(pp);
+ if (!ret)
+ return 0;
+
+ clk_bulk_disable_unprepare(rockchip->clk_cnt, rockchip->clks);
+deinit_phy:
+ rockchip_pcie_phy_deinit(rockchip);
+disable_regulator:
+ regulator_disable(rockchip->vpcie3v3);
+
+ return ret;
+}
+
+static const struct of_device_id rockchip_pcie_of_match[] = {
+ { .compatible = "rockchip,rk3568-pcie", },
+ {},
+};
+
+static struct platform_driver rockchip_pcie_driver = {
+ .driver = {
+ .name = "rockchip-dw-pcie",
+ .of_match_table = rockchip_pcie_of_match,
+ .suppress_bind_attrs = true,
+ },
+ .probe = rockchip_pcie_probe,
+};
+builtin_platform_driver(rockchip_pcie_driver);
--
2.25.1
^ permalink raw reply related [flat|nested] 16+ messages in thread
* [PATCH v9 2/2] PCI: rockchip: Add Rockchip RK356X host controller driver
@ 2021-05-06 2:35 ` Simon Xue
0 siblings, 0 replies; 16+ messages in thread
From: Simon Xue @ 2021-05-06 2:35 UTC (permalink / raw)
To: Bjorn Helgaas, Lorenzo Pieralisi
Cc: linux-pci, linux-rockchip, devicetree, robh+dt, Johan Jonker,
Heiko Stuebner, Simon Xue, Peter Geis, Kever Yang,
kernel test robot, Shawn Lin
Add a driver for the DesignWare-based PCIe controller found on
RK356X. The existing pcie-rockchip-host driver is only used for
the Rockchip-designed IP found on RK3399.
Tested-by: Peter Geis <pgwipeout@gmail.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Simon Xue <xxm@rock-chips.com>
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
---
drivers/pci/controller/dwc/Kconfig | 11 +
drivers/pci/controller/dwc/Makefile | 1 +
drivers/pci/controller/dwc/pcie-dw-rockchip.c | 277 ++++++++++++++++++
3 files changed, 289 insertions(+)
create mode 100644 drivers/pci/controller/dwc/pcie-dw-rockchip.c
diff --git a/drivers/pci/controller/dwc/Kconfig b/drivers/pci/controller/dwc/Kconfig
index 423d35872ce4..60d3dde9ca39 100644
--- a/drivers/pci/controller/dwc/Kconfig
+++ b/drivers/pci/controller/dwc/Kconfig
@@ -214,6 +214,17 @@ config PCIE_ARTPEC6_EP
Enables support for the PCIe controller in the ARTPEC-6 SoC to work in
endpoint mode. This uses the DesignWare core.
+config PCIE_ROCKCHIP_DW_HOST
+ bool "Rockchip DesignWare PCIe controller"
+ select PCIE_DW
+ select PCIE_DW_HOST
+ depends on PCI_MSI_IRQ_DOMAIN
+ depends on ARCH_ROCKCHIP || COMPILE_TEST
+ depends on OF
+ help
+ Enables support for the DesignWare PCIe controller in the
+ Rockchip SoC except RK3399.
+
config PCIE_INTEL_GW
bool "Intel Gateway PCIe host controller support"
depends on OF && (X86 || COMPILE_TEST)
diff --git a/drivers/pci/controller/dwc/Makefile b/drivers/pci/controller/dwc/Makefile
index eca805c1a023..689b06a7d334 100644
--- a/drivers/pci/controller/dwc/Makefile
+++ b/drivers/pci/controller/dwc/Makefile
@@ -14,6 +14,7 @@ obj-$(CONFIG_PCI_LAYERSCAPE_EP) += pci-layerscape-ep.o
obj-$(CONFIG_PCIE_QCOM) += pcie-qcom.o
obj-$(CONFIG_PCIE_ARMADA_8K) += pcie-armada8k.o
obj-$(CONFIG_PCIE_ARTPEC6) += pcie-artpec6.o
+obj-$(CONFIG_PCIE_ROCKCHIP_DW_HOST) += pcie-dw-rockchip.o
obj-$(CONFIG_PCIE_INTEL_GW) += pcie-intel-gw.o
obj-$(CONFIG_PCIE_KIRIN) += pcie-kirin.o
obj-$(CONFIG_PCIE_HISI_STB) += pcie-histb.o
diff --git a/drivers/pci/controller/dwc/pcie-dw-rockchip.c b/drivers/pci/controller/dwc/pcie-dw-rockchip.c
new file mode 100644
index 000000000000..3f060144eeab
--- /dev/null
+++ b/drivers/pci/controller/dwc/pcie-dw-rockchip.c
@@ -0,0 +1,277 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * PCIe host controller driver for Rockchip SoCs.
+ *
+ * Copyright (C) 2021 Rockchip Electronics Co., Ltd.
+ * http://www.rock-chips.com
+ *
+ * Author: Simon Xue <xxm@rock-chips.com>
+ */
+
+#include <linux/clk.h>
+#include <linux/gpio/consumer.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/reset.h>
+
+#include "pcie-designware.h"
+
+/*
+ * The upper 16 bits of PCIE_CLIENT_CONFIG are a write
+ * mask for the lower 16 bits.
+ */
+#define HIWORD_UPDATE(mask, val) (((mask) << 16) | (val))
+#define HIWORD_UPDATE_BIT(val) HIWORD_UPDATE(val, val)
+
+#define to_rockchip_pcie(x) dev_get_drvdata((x)->dev)
+
+#define PCIE_CLIENT_RC_MODE HIWORD_UPDATE_BIT(0x40)
+#define PCIE_CLIENT_ENABLE_LTSSM HIWORD_UPDATE_BIT(0xc)
+#define PCIE_SMLH_LINKUP BIT(16)
+#define PCIE_RDLH_LINKUP BIT(17)
+#define PCIE_LINKUP (PCIE_SMLH_LINKUP | PCIE_RDLH_LINKUP)
+#define PCIE_L0S_ENTRY 0x11
+#define PCIE_CLIENT_GENERAL_CONTROL 0x0
+#define PCIE_CLIENT_GENERAL_DEBUG 0x104
+#define PCIE_CLIENT_HOT_RESET_CTRL 0x180
+#define PCIE_CLIENT_LTSSM_STATUS 0x300
+#define PCIE_LTSSM_ENABLE_ENHANCE BIT(4)
+
+struct rockchip_pcie {
+ struct dw_pcie pci;
+ void __iomem *apb_base;
+ struct phy *phy;
+ struct clk_bulk_data *clks;
+ unsigned int clk_cnt;
+ struct reset_control *rst;
+ struct gpio_desc *rst_gpio;
+ struct regulator *vpcie3v3;
+};
+
+static int rockchip_pcie_readl_apb(struct rockchip_pcie *rockchip,
+ u32 reg)
+{
+ return readl(rockchip->apb_base + reg);
+}
+
+static void rockchip_pcie_writel_apb(struct rockchip_pcie *rockchip,
+ u32 val, u32 reg)
+{
+ writel(val, rockchip->apb_base + reg);
+}
+
+static void rockchip_pcie_enable_ltssm(struct rockchip_pcie *rockchip)
+{
+ rockchip_pcie_writel_apb(rockchip, PCIE_CLIENT_ENABLE_LTSSM,
+ PCIE_CLIENT_GENERAL_CONTROL);
+}
+
+static int rockchip_pcie_link_up(struct dw_pcie *pci)
+{
+ struct rockchip_pcie *rockchip = to_rockchip_pcie(pci);
+ u32 val = rockchip_pcie_readl_apb(rockchip, PCIE_CLIENT_LTSSM_STATUS);
+
+ if ((val & (PCIE_RDLH_LINKUP | PCIE_SMLH_LINKUP)) == PCIE_LINKUP &&
+ (val & GENMASK(5, 0)) == PCIE_L0S_ENTRY)
+ return 1;
+
+ return 0;
+}
+
+static int rockchip_pcie_start_link(struct dw_pcie *pci)
+{
+ struct rockchip_pcie *rockchip = to_rockchip_pcie(pci);
+
+ /* Reset device */
+ gpiod_set_value_cansleep(rockchip->rst_gpio, 0);
+
+ rockchip_pcie_enable_ltssm(rockchip);
+
+ /*
+ * PCIe requires the refclk to be stable for 100µs prior to releasing
+ * PERST. See table 2-4 in section 2.6.2 AC Specifications of the PCI
+ * Express Card Electromechanical Specification, 1.1. However, we don't
+ * know if the refclk is coming from RC's PHY or external OSC. If it's
+ * from RC, so enabling LTSSM is the just right place to release #PERST.
+ * We need more extra time as before, rather than setting just
+ * 100us as we don't know how long should the device need to reset.
+ */
+ msleep(100);
+ gpiod_set_value_cansleep(rockchip->rst_gpio, 1);
+
+ return 0;
+}
+
+static int rockchip_pcie_host_init(struct pcie_port *pp)
+{
+ struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
+ struct rockchip_pcie *rockchip = to_rockchip_pcie(pci);
+ u32 val;
+
+ /* LTSSM enable control mode */
+ val = rockchip_pcie_readl_apb(rockchip, PCIE_CLIENT_HOT_RESET_CTRL);
+ val |= PCIE_LTSSM_ENABLE_ENHANCE | (PCIE_LTSSM_ENABLE_ENHANCE << 16);
+ rockchip_pcie_writel_apb(rockchip, val, PCIE_CLIENT_HOT_RESET_CTRL);
+
+ rockchip_pcie_writel_apb(rockchip, PCIE_CLIENT_RC_MODE,
+ PCIE_CLIENT_GENERAL_CONTROL);
+
+ return 0;
+}
+
+static const struct dw_pcie_host_ops rockchip_pcie_host_ops = {
+ .host_init = rockchip_pcie_host_init,
+};
+
+static int rockchip_pcie_clk_init(struct rockchip_pcie *rockchip)
+{
+ struct device *dev = rockchip->pci.dev;
+ int ret;
+
+ ret = devm_clk_bulk_get_all(dev, &rockchip->clks);
+ if (ret < 0)
+ return ret;
+
+ rockchip->clk_cnt = ret;
+
+ return clk_bulk_prepare_enable(rockchip->clk_cnt, rockchip->clks);
+}
+
+static int rockchip_pcie_resource_get(struct platform_device *pdev,
+ struct rockchip_pcie *rockchip)
+{
+ rockchip->apb_base = devm_platform_ioremap_resource_byname(pdev, "apb");
+ if (IS_ERR(rockchip->apb_base))
+ return PTR_ERR(rockchip->apb_base);
+
+ rockchip->rst_gpio = devm_gpiod_get_optional(&pdev->dev, "reset",
+ GPIOD_OUT_HIGH);
+ if (IS_ERR(rockchip->rst_gpio))
+ return PTR_ERR(rockchip->rst_gpio);
+
+ return 0;
+}
+
+static int rockchip_pcie_phy_init(struct rockchip_pcie *rockchip)
+{
+ struct device *dev = rockchip->pci.dev;
+ int ret;
+
+ rockchip->phy = devm_phy_get(dev, "pcie-phy");
+ if (IS_ERR(rockchip->phy))
+ return dev_err_probe(dev, PTR_ERR(rockchip->phy),
+ "missing PHY\n");
+
+ ret = phy_init(rockchip->phy);
+ if (ret < 0)
+ return ret;
+
+ ret = phy_power_on(rockchip->phy);
+ if (ret)
+ phy_exit(rockchip->phy);
+
+ return ret;
+}
+
+static void rockchip_pcie_phy_deinit(struct rockchip_pcie *rockchip)
+{
+ phy_exit(rockchip->phy);
+ phy_power_off(rockchip->phy);
+}
+
+static int rockchip_pcie_reset_control_release(struct rockchip_pcie *rockchip)
+{
+ struct device *dev = rockchip->pci.dev;
+
+ rockchip->rst = devm_reset_control_array_get_exclusive(dev);
+ if (IS_ERR(rockchip->rst))
+ return dev_err_probe(dev, PTR_ERR(rockchip->rst),
+ "failed to get reset lines\n");
+
+ return reset_control_deassert(rockchip->rst);
+}
+
+static const struct dw_pcie_ops dw_pcie_ops = {
+ .link_up = rockchip_pcie_link_up,
+ .start_link = rockchip_pcie_start_link,
+};
+
+static int rockchip_pcie_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct rockchip_pcie *rockchip;
+ struct pcie_port *pp;
+ int ret;
+
+ rockchip = devm_kzalloc(dev, sizeof(*rockchip), GFP_KERNEL);
+ if (!rockchip)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, rockchip);
+
+ rockchip->pci.dev = dev;
+ rockchip->pci.ops = &dw_pcie_ops;
+
+ pp = &rockchip->pci.pp;
+ pp->ops = &rockchip_pcie_host_ops;
+
+ ret = rockchip_pcie_resource_get(pdev, rockchip);
+ if (ret)
+ return ret;
+
+ /* DON'T MOVE ME: must be enable before PHY init */
+ rockchip->vpcie3v3 = devm_regulator_get_optional(dev, "vpcie3v3");
+ if (IS_ERR(rockchip->vpcie3v3))
+ if (PTR_ERR(rockchip->vpcie3v3) != -ENODEV)
+ return dev_err_probe(dev, PTR_ERR(rockchip->vpcie3v3),
+ "failed to get vpcie3v3 regulator\n");
+
+ ret = regulator_enable(rockchip->vpcie3v3);
+ if (ret) {
+ dev_err(dev, "failed to enable vpcie3v3 regulator\n");
+ return ret;
+ }
+
+ ret = rockchip_pcie_phy_init(rockchip);
+ if (ret)
+ goto disable_regulator;
+
+ ret = rockchip_pcie_reset_control_release(rockchip);
+ if (ret)
+ goto deinit_phy;
+
+ ret = rockchip_pcie_clk_init(rockchip);
+ if (ret)
+ goto deinit_phy;
+
+ ret = dw_pcie_host_init(pp);
+ if (!ret)
+ return 0;
+
+ clk_bulk_disable_unprepare(rockchip->clk_cnt, rockchip->clks);
+deinit_phy:
+ rockchip_pcie_phy_deinit(rockchip);
+disable_regulator:
+ regulator_disable(rockchip->vpcie3v3);
+
+ return ret;
+}
+
+static const struct of_device_id rockchip_pcie_of_match[] = {
+ { .compatible = "rockchip,rk3568-pcie", },
+ {},
+};
+
+static struct platform_driver rockchip_pcie_driver = {
+ .driver = {
+ .name = "rockchip-dw-pcie",
+ .of_match_table = rockchip_pcie_of_match,
+ .suppress_bind_attrs = true,
+ },
+ .probe = rockchip_pcie_probe,
+};
+builtin_platform_driver(rockchip_pcie_driver);
--
2.25.1
_______________________________________________
Linux-rockchip mailing list
Linux-rockchip@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-rockchip
^ permalink raw reply related [flat|nested] 16+ messages in thread
* Re: [PATCH v9 2/2] PCI: rockchip: Add Rockchip RK356X host controller driver
2021-05-06 2:35 ` Simon Xue
@ 2021-06-23 14:33 ` Lorenzo Pieralisi
-1 siblings, 0 replies; 16+ messages in thread
From: Lorenzo Pieralisi @ 2021-06-23 14:33 UTC (permalink / raw)
To: Simon Xue, pali
Cc: Bjorn Helgaas, linux-pci, linux-rockchip, devicetree, robh+dt,
Johan Jonker, Heiko Stuebner, Peter Geis, Kever Yang,
kernel test robot, Shawn Lin
[+Pali]
On Thu, May 06, 2021 at 10:35:44AM +0800, Simon Xue wrote:
> Add a driver for the DesignWare-based PCIe controller found on
> RK356X. The existing pcie-rockchip-host driver is only used for
> the Rockchip-designed IP found on RK3399.
>
> Tested-by: Peter Geis <pgwipeout@gmail.com>
> Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
> Reported-by: kernel test robot <lkp@intel.com>
I will remove this tag - it does not make sense on a patch adding
a new driver.
[...]
> +static int rockchip_pcie_start_link(struct dw_pcie *pci)
> +{
> + struct rockchip_pcie *rockchip = to_rockchip_pcie(pci);
> +
> + /* Reset device */
> + gpiod_set_value_cansleep(rockchip->rst_gpio, 0);
> +
> + rockchip_pcie_enable_ltssm(rockchip);
> +
> + /*
> + * PCIe requires the refclk to be stable for 100µs prior to releasing
> + * PERST. See table 2-4 in section 2.6.2 AC Specifications of the PCI
> + * Express Card Electromechanical Specification, 1.1. However, we don't
> + * know if the refclk is coming from RC's PHY or external OSC. If it's
> + * from RC, so enabling LTSSM is the just right place to release #PERST.
> + * We need more extra time as before, rather than setting just
> + * 100us as we don't know how long should the device need to reset.
> + */
> + msleep(100);
Any rationale behind the time chosen ?
Ongoing discussion:
https://lore.kernel.org/linux-pci/20210531090540.2663171-1-luca@lucaceresoli.net
Lorenzo
> + gpiod_set_value_cansleep(rockchip->rst_gpio, 1);
> +
> + return 0;
> +}
> +
> +static int rockchip_pcie_host_init(struct pcie_port *pp)
> +{
> + struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
> + struct rockchip_pcie *rockchip = to_rockchip_pcie(pci);
> + u32 val;
> +
> + /* LTSSM enable control mode */
> + val = rockchip_pcie_readl_apb(rockchip, PCIE_CLIENT_HOT_RESET_CTRL);
> + val |= PCIE_LTSSM_ENABLE_ENHANCE | (PCIE_LTSSM_ENABLE_ENHANCE << 16);
> + rockchip_pcie_writel_apb(rockchip, val, PCIE_CLIENT_HOT_RESET_CTRL);
> +
> + rockchip_pcie_writel_apb(rockchip, PCIE_CLIENT_RC_MODE,
> + PCIE_CLIENT_GENERAL_CONTROL);
> +
> + return 0;
> +}
> +
> +static const struct dw_pcie_host_ops rockchip_pcie_host_ops = {
> + .host_init = rockchip_pcie_host_init,
> +};
> +
> +static int rockchip_pcie_clk_init(struct rockchip_pcie *rockchip)
> +{
> + struct device *dev = rockchip->pci.dev;
> + int ret;
> +
> + ret = devm_clk_bulk_get_all(dev, &rockchip->clks);
> + if (ret < 0)
> + return ret;
> +
> + rockchip->clk_cnt = ret;
> +
> + return clk_bulk_prepare_enable(rockchip->clk_cnt, rockchip->clks);
> +}
> +
> +static int rockchip_pcie_resource_get(struct platform_device *pdev,
> + struct rockchip_pcie *rockchip)
> +{
> + rockchip->apb_base = devm_platform_ioremap_resource_byname(pdev, "apb");
> + if (IS_ERR(rockchip->apb_base))
> + return PTR_ERR(rockchip->apb_base);
> +
> + rockchip->rst_gpio = devm_gpiod_get_optional(&pdev->dev, "reset",
> + GPIOD_OUT_HIGH);
> + if (IS_ERR(rockchip->rst_gpio))
> + return PTR_ERR(rockchip->rst_gpio);
> +
> + return 0;
> +}
> +
> +static int rockchip_pcie_phy_init(struct rockchip_pcie *rockchip)
> +{
> + struct device *dev = rockchip->pci.dev;
> + int ret;
> +
> + rockchip->phy = devm_phy_get(dev, "pcie-phy");
> + if (IS_ERR(rockchip->phy))
> + return dev_err_probe(dev, PTR_ERR(rockchip->phy),
> + "missing PHY\n");
> +
> + ret = phy_init(rockchip->phy);
> + if (ret < 0)
> + return ret;
> +
> + ret = phy_power_on(rockchip->phy);
> + if (ret)
> + phy_exit(rockchip->phy);
> +
> + return ret;
> +}
> +
> +static void rockchip_pcie_phy_deinit(struct rockchip_pcie *rockchip)
> +{
> + phy_exit(rockchip->phy);
> + phy_power_off(rockchip->phy);
> +}
> +
> +static int rockchip_pcie_reset_control_release(struct rockchip_pcie *rockchip)
> +{
> + struct device *dev = rockchip->pci.dev;
> +
> + rockchip->rst = devm_reset_control_array_get_exclusive(dev);
> + if (IS_ERR(rockchip->rst))
> + return dev_err_probe(dev, PTR_ERR(rockchip->rst),
> + "failed to get reset lines\n");
> +
> + return reset_control_deassert(rockchip->rst);
> +}
> +
> +static const struct dw_pcie_ops dw_pcie_ops = {
> + .link_up = rockchip_pcie_link_up,
> + .start_link = rockchip_pcie_start_link,
> +};
> +
> +static int rockchip_pcie_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct rockchip_pcie *rockchip;
> + struct pcie_port *pp;
> + int ret;
> +
> + rockchip = devm_kzalloc(dev, sizeof(*rockchip), GFP_KERNEL);
> + if (!rockchip)
> + return -ENOMEM;
> +
> + platform_set_drvdata(pdev, rockchip);
> +
> + rockchip->pci.dev = dev;
> + rockchip->pci.ops = &dw_pcie_ops;
> +
> + pp = &rockchip->pci.pp;
> + pp->ops = &rockchip_pcie_host_ops;
> +
> + ret = rockchip_pcie_resource_get(pdev, rockchip);
> + if (ret)
> + return ret;
> +
> + /* DON'T MOVE ME: must be enable before PHY init */
> + rockchip->vpcie3v3 = devm_regulator_get_optional(dev, "vpcie3v3");
> + if (IS_ERR(rockchip->vpcie3v3))
> + if (PTR_ERR(rockchip->vpcie3v3) != -ENODEV)
> + return dev_err_probe(dev, PTR_ERR(rockchip->vpcie3v3),
> + "failed to get vpcie3v3 regulator\n");
> +
> + ret = regulator_enable(rockchip->vpcie3v3);
> + if (ret) {
> + dev_err(dev, "failed to enable vpcie3v3 regulator\n");
> + return ret;
> + }
> +
> + ret = rockchip_pcie_phy_init(rockchip);
> + if (ret)
> + goto disable_regulator;
> +
> + ret = rockchip_pcie_reset_control_release(rockchip);
> + if (ret)
> + goto deinit_phy;
> +
> + ret = rockchip_pcie_clk_init(rockchip);
> + if (ret)
> + goto deinit_phy;
> +
> + ret = dw_pcie_host_init(pp);
> + if (!ret)
> + return 0;
> +
> + clk_bulk_disable_unprepare(rockchip->clk_cnt, rockchip->clks);
> +deinit_phy:
> + rockchip_pcie_phy_deinit(rockchip);
> +disable_regulator:
> + regulator_disable(rockchip->vpcie3v3);
> +
> + return ret;
> +}
> +
> +static const struct of_device_id rockchip_pcie_of_match[] = {
> + { .compatible = "rockchip,rk3568-pcie", },
> + {},
> +};
> +
> +static struct platform_driver rockchip_pcie_driver = {
> + .driver = {
> + .name = "rockchip-dw-pcie",
> + .of_match_table = rockchip_pcie_of_match,
> + .suppress_bind_attrs = true,
> + },
> + .probe = rockchip_pcie_probe,
> +};
> +builtin_platform_driver(rockchip_pcie_driver);
> --
> 2.25.1
>
>
>
^ permalink raw reply [flat|nested] 16+ messages in thread
* Re: [PATCH v9 2/2] PCI: rockchip: Add Rockchip RK356X host controller driver
@ 2021-06-23 14:33 ` Lorenzo Pieralisi
0 siblings, 0 replies; 16+ messages in thread
From: Lorenzo Pieralisi @ 2021-06-23 14:33 UTC (permalink / raw)
To: Simon Xue, pali
Cc: Bjorn Helgaas, linux-pci, linux-rockchip, devicetree, robh+dt,
Johan Jonker, Heiko Stuebner, Peter Geis, Kever Yang,
kernel test robot, Shawn Lin
[+Pali]
On Thu, May 06, 2021 at 10:35:44AM +0800, Simon Xue wrote:
> Add a driver for the DesignWare-based PCIe controller found on
> RK356X. The existing pcie-rockchip-host driver is only used for
> the Rockchip-designed IP found on RK3399.
>
> Tested-by: Peter Geis <pgwipeout@gmail.com>
> Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
> Reported-by: kernel test robot <lkp@intel.com>
I will remove this tag - it does not make sense on a patch adding
a new driver.
[...]
> +static int rockchip_pcie_start_link(struct dw_pcie *pci)
> +{
> + struct rockchip_pcie *rockchip = to_rockchip_pcie(pci);
> +
> + /* Reset device */
> + gpiod_set_value_cansleep(rockchip->rst_gpio, 0);
> +
> + rockchip_pcie_enable_ltssm(rockchip);
> +
> + /*
> + * PCIe requires the refclk to be stable for 100µs prior to releasing
> + * PERST. See table 2-4 in section 2.6.2 AC Specifications of the PCI
> + * Express Card Electromechanical Specification, 1.1. However, we don't
> + * know if the refclk is coming from RC's PHY or external OSC. If it's
> + * from RC, so enabling LTSSM is the just right place to release #PERST.
> + * We need more extra time as before, rather than setting just
> + * 100us as we don't know how long should the device need to reset.
> + */
> + msleep(100);
Any rationale behind the time chosen ?
Ongoing discussion:
https://lore.kernel.org/linux-pci/20210531090540.2663171-1-luca@lucaceresoli.net
Lorenzo
> + gpiod_set_value_cansleep(rockchip->rst_gpio, 1);
> +
> + return 0;
> +}
> +
> +static int rockchip_pcie_host_init(struct pcie_port *pp)
> +{
> + struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
> + struct rockchip_pcie *rockchip = to_rockchip_pcie(pci);
> + u32 val;
> +
> + /* LTSSM enable control mode */
> + val = rockchip_pcie_readl_apb(rockchip, PCIE_CLIENT_HOT_RESET_CTRL);
> + val |= PCIE_LTSSM_ENABLE_ENHANCE | (PCIE_LTSSM_ENABLE_ENHANCE << 16);
> + rockchip_pcie_writel_apb(rockchip, val, PCIE_CLIENT_HOT_RESET_CTRL);
> +
> + rockchip_pcie_writel_apb(rockchip, PCIE_CLIENT_RC_MODE,
> + PCIE_CLIENT_GENERAL_CONTROL);
> +
> + return 0;
> +}
> +
> +static const struct dw_pcie_host_ops rockchip_pcie_host_ops = {
> + .host_init = rockchip_pcie_host_init,
> +};
> +
> +static int rockchip_pcie_clk_init(struct rockchip_pcie *rockchip)
> +{
> + struct device *dev = rockchip->pci.dev;
> + int ret;
> +
> + ret = devm_clk_bulk_get_all(dev, &rockchip->clks);
> + if (ret < 0)
> + return ret;
> +
> + rockchip->clk_cnt = ret;
> +
> + return clk_bulk_prepare_enable(rockchip->clk_cnt, rockchip->clks);
> +}
> +
> +static int rockchip_pcie_resource_get(struct platform_device *pdev,
> + struct rockchip_pcie *rockchip)
> +{
> + rockchip->apb_base = devm_platform_ioremap_resource_byname(pdev, "apb");
> + if (IS_ERR(rockchip->apb_base))
> + return PTR_ERR(rockchip->apb_base);
> +
> + rockchip->rst_gpio = devm_gpiod_get_optional(&pdev->dev, "reset",
> + GPIOD_OUT_HIGH);
> + if (IS_ERR(rockchip->rst_gpio))
> + return PTR_ERR(rockchip->rst_gpio);
> +
> + return 0;
> +}
> +
> +static int rockchip_pcie_phy_init(struct rockchip_pcie *rockchip)
> +{
> + struct device *dev = rockchip->pci.dev;
> + int ret;
> +
> + rockchip->phy = devm_phy_get(dev, "pcie-phy");
> + if (IS_ERR(rockchip->phy))
> + return dev_err_probe(dev, PTR_ERR(rockchip->phy),
> + "missing PHY\n");
> +
> + ret = phy_init(rockchip->phy);
> + if (ret < 0)
> + return ret;
> +
> + ret = phy_power_on(rockchip->phy);
> + if (ret)
> + phy_exit(rockchip->phy);
> +
> + return ret;
> +}
> +
> +static void rockchip_pcie_phy_deinit(struct rockchip_pcie *rockchip)
> +{
> + phy_exit(rockchip->phy);
> + phy_power_off(rockchip->phy);
> +}
> +
> +static int rockchip_pcie_reset_control_release(struct rockchip_pcie *rockchip)
> +{
> + struct device *dev = rockchip->pci.dev;
> +
> + rockchip->rst = devm_reset_control_array_get_exclusive(dev);
> + if (IS_ERR(rockchip->rst))
> + return dev_err_probe(dev, PTR_ERR(rockchip->rst),
> + "failed to get reset lines\n");
> +
> + return reset_control_deassert(rockchip->rst);
> +}
> +
> +static const struct dw_pcie_ops dw_pcie_ops = {
> + .link_up = rockchip_pcie_link_up,
> + .start_link = rockchip_pcie_start_link,
> +};
> +
> +static int rockchip_pcie_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct rockchip_pcie *rockchip;
> + struct pcie_port *pp;
> + int ret;
> +
> + rockchip = devm_kzalloc(dev, sizeof(*rockchip), GFP_KERNEL);
> + if (!rockchip)
> + return -ENOMEM;
> +
> + platform_set_drvdata(pdev, rockchip);
> +
> + rockchip->pci.dev = dev;
> + rockchip->pci.ops = &dw_pcie_ops;
> +
> + pp = &rockchip->pci.pp;
> + pp->ops = &rockchip_pcie_host_ops;
> +
> + ret = rockchip_pcie_resource_get(pdev, rockchip);
> + if (ret)
> + return ret;
> +
> + /* DON'T MOVE ME: must be enable before PHY init */
> + rockchip->vpcie3v3 = devm_regulator_get_optional(dev, "vpcie3v3");
> + if (IS_ERR(rockchip->vpcie3v3))
> + if (PTR_ERR(rockchip->vpcie3v3) != -ENODEV)
> + return dev_err_probe(dev, PTR_ERR(rockchip->vpcie3v3),
> + "failed to get vpcie3v3 regulator\n");
> +
> + ret = regulator_enable(rockchip->vpcie3v3);
> + if (ret) {
> + dev_err(dev, "failed to enable vpcie3v3 regulator\n");
> + return ret;
> + }
> +
> + ret = rockchip_pcie_phy_init(rockchip);
> + if (ret)
> + goto disable_regulator;
> +
> + ret = rockchip_pcie_reset_control_release(rockchip);
> + if (ret)
> + goto deinit_phy;
> +
> + ret = rockchip_pcie_clk_init(rockchip);
> + if (ret)
> + goto deinit_phy;
> +
> + ret = dw_pcie_host_init(pp);
> + if (!ret)
> + return 0;
> +
> + clk_bulk_disable_unprepare(rockchip->clk_cnt, rockchip->clks);
> +deinit_phy:
> + rockchip_pcie_phy_deinit(rockchip);
> +disable_regulator:
> + regulator_disable(rockchip->vpcie3v3);
> +
> + return ret;
> +}
> +
> +static const struct of_device_id rockchip_pcie_of_match[] = {
> + { .compatible = "rockchip,rk3568-pcie", },
> + {},
> +};
> +
> +static struct platform_driver rockchip_pcie_driver = {
> + .driver = {
> + .name = "rockchip-dw-pcie",
> + .of_match_table = rockchip_pcie_of_match,
> + .suppress_bind_attrs = true,
> + },
> + .probe = rockchip_pcie_probe,
> +};
> +builtin_platform_driver(rockchip_pcie_driver);
> --
> 2.25.1
>
>
>
_______________________________________________
Linux-rockchip mailing list
Linux-rockchip@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-rockchip
^ permalink raw reply [flat|nested] 16+ messages in thread
* Re: [PATCH v9 2/2] PCI: rockchip: Add Rockchip RK356X host controller driver
2021-05-06 2:35 ` Simon Xue
@ 2021-06-23 21:15 ` Rob Herring
-1 siblings, 0 replies; 16+ messages in thread
From: Rob Herring @ 2021-06-23 21:15 UTC (permalink / raw)
To: Simon Xue
Cc: Bjorn Helgaas, Lorenzo Pieralisi, linux-pci, linux-rockchip,
devicetree, Johan Jonker, Heiko Stuebner, Peter Geis, Kever Yang,
kernel test robot, Shawn Lin
== On Wed, May 5, 2021 at 8:35 PM Simon Xue <xxm@rock-chips.com> wrote:
>
> Add a driver for the DesignWare-based PCIe controller found on
> RK356X. The existing pcie-rockchip-host driver is only used for
> the Rockchip-designed IP found on RK3399.
>
> Tested-by: Peter Geis <pgwipeout@gmail.com>
> Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
> Reported-by: kernel test robot <lkp@intel.com>
> Signed-off-by: Simon Xue <xxm@rock-chips.com>
> Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
> ---
> drivers/pci/controller/dwc/Kconfig | 11 +
> drivers/pci/controller/dwc/Makefile | 1 +
> drivers/pci/controller/dwc/pcie-dw-rockchip.c | 277 ++++++++++++++++++
> 3 files changed, 289 insertions(+)
> create mode 100644 drivers/pci/controller/dwc/pcie-dw-rockchip.c
>
> diff --git a/drivers/pci/controller/dwc/Kconfig b/drivers/pci/controller/dwc/Kconfig
> index 423d35872ce4..60d3dde9ca39 100644
> --- a/drivers/pci/controller/dwc/Kconfig
> +++ b/drivers/pci/controller/dwc/Kconfig
> @@ -214,6 +214,17 @@ config PCIE_ARTPEC6_EP
> Enables support for the PCIe controller in the ARTPEC-6 SoC to work in
> endpoint mode. This uses the DesignWare core.
>
> +config PCIE_ROCKCHIP_DW_HOST
> + bool "Rockchip DesignWare PCIe controller"
> + select PCIE_DW
> + select PCIE_DW_HOST
> + depends on PCI_MSI_IRQ_DOMAIN
> + depends on ARCH_ROCKCHIP || COMPILE_TEST
> + depends on OF
> + help
> + Enables support for the DesignWare PCIe controller in the
> + Rockchip SoC except RK3399.
> +
> config PCIE_INTEL_GW
> bool "Intel Gateway PCIe host controller support"
> depends on OF && (X86 || COMPILE_TEST)
> diff --git a/drivers/pci/controller/dwc/Makefile b/drivers/pci/controller/dwc/Makefile
> index eca805c1a023..689b06a7d334 100644
> --- a/drivers/pci/controller/dwc/Makefile
> +++ b/drivers/pci/controller/dwc/Makefile
> @@ -14,6 +14,7 @@ obj-$(CONFIG_PCI_LAYERSCAPE_EP) += pci-layerscape-ep.o
> obj-$(CONFIG_PCIE_QCOM) += pcie-qcom.o
> obj-$(CONFIG_PCIE_ARMADA_8K) += pcie-armada8k.o
> obj-$(CONFIG_PCIE_ARTPEC6) += pcie-artpec6.o
> +obj-$(CONFIG_PCIE_ROCKCHIP_DW_HOST) += pcie-dw-rockchip.o
> obj-$(CONFIG_PCIE_INTEL_GW) += pcie-intel-gw.o
> obj-$(CONFIG_PCIE_KIRIN) += pcie-kirin.o
> obj-$(CONFIG_PCIE_HISI_STB) += pcie-histb.o
> diff --git a/drivers/pci/controller/dwc/pcie-dw-rockchip.c b/drivers/pci/controller/dwc/pcie-dw-rockchip.c
> new file mode 100644
> index 000000000000..3f060144eeab
> --- /dev/null
> +++ b/drivers/pci/controller/dwc/pcie-dw-rockchip.c
> @@ -0,0 +1,277 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * PCIe host controller driver for Rockchip SoCs.
> + *
> + * Copyright (C) 2021 Rockchip Electronics Co., Ltd.
> + * http://www.rock-chips.com
> + *
> + * Author: Simon Xue <xxm@rock-chips.com>
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/mfd/syscon.h>
> +#include <linux/module.h>
> +#include <linux/of_device.h>
> +#include <linux/phy/phy.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +#include <linux/reset.h>
> +
> +#include "pcie-designware.h"
> +
> +/*
> + * The upper 16 bits of PCIE_CLIENT_CONFIG are a write
> + * mask for the lower 16 bits.
> + */
> +#define HIWORD_UPDATE(mask, val) (((mask) << 16) | (val))
> +#define HIWORD_UPDATE_BIT(val) HIWORD_UPDATE(val, val)
> +
> +#define to_rockchip_pcie(x) dev_get_drvdata((x)->dev)
> +
> +#define PCIE_CLIENT_RC_MODE HIWORD_UPDATE_BIT(0x40)
> +#define PCIE_CLIENT_ENABLE_LTSSM HIWORD_UPDATE_BIT(0xc)
> +#define PCIE_SMLH_LINKUP BIT(16)
> +#define PCIE_RDLH_LINKUP BIT(17)
> +#define PCIE_LINKUP (PCIE_SMLH_LINKUP | PCIE_RDLH_LINKUP)
> +#define PCIE_L0S_ENTRY 0x11
> +#define PCIE_CLIENT_GENERAL_CONTROL 0x0
> +#define PCIE_CLIENT_GENERAL_DEBUG 0x104
> +#define PCIE_CLIENT_HOT_RESET_CTRL 0x180
> +#define PCIE_CLIENT_LTSSM_STATUS 0x300
> +#define PCIE_LTSSM_ENABLE_ENHANCE BIT(4)
> +
> +struct rockchip_pcie {
> + struct dw_pcie pci;
> + void __iomem *apb_base;
> + struct phy *phy;
> + struct clk_bulk_data *clks;
> + unsigned int clk_cnt;
> + struct reset_control *rst;
> + struct gpio_desc *rst_gpio;
> + struct regulator *vpcie3v3;
> +};
> +
> +static int rockchip_pcie_readl_apb(struct rockchip_pcie *rockchip,
> + u32 reg)
> +{
> + return readl(rockchip->apb_base + reg);
Use _relaxed variant.
> +}
> +
> +static void rockchip_pcie_writel_apb(struct rockchip_pcie *rockchip,
> + u32 val, u32 reg)
> +{
> + writel(val, rockchip->apb_base + reg);
Use _relaxed variant.
> +}
> +
> +static void rockchip_pcie_enable_ltssm(struct rockchip_pcie *rockchip)
> +{
> + rockchip_pcie_writel_apb(rockchip, PCIE_CLIENT_ENABLE_LTSSM,
> + PCIE_CLIENT_GENERAL_CONTROL);
> +}
> +
> +static int rockchip_pcie_link_up(struct dw_pcie *pci)
> +{
> + struct rockchip_pcie *rockchip = to_rockchip_pcie(pci);
> + u32 val = rockchip_pcie_readl_apb(rockchip, PCIE_CLIENT_LTSSM_STATUS);
> +
> + if ((val & (PCIE_RDLH_LINKUP | PCIE_SMLH_LINKUP)) == PCIE_LINKUP &&
((val & PCIE_LINKUP) == PCIE_LINKUP)
> + (val & GENMASK(5, 0)) == PCIE_L0S_ENTRY)
Perhaps a define for GENMASK(5, 0)
> + return 1;
> +
> + return 0;
> +}
> +
> +static int rockchip_pcie_start_link(struct dw_pcie *pci)
> +{
> + struct rockchip_pcie *rockchip = to_rockchip_pcie(pci);
> +
> + /* Reset device */
> + gpiod_set_value_cansleep(rockchip->rst_gpio, 0);
With gpiod, 0 means inactive which is reset deasserted. Your DT should
have an ACTIVE_LOW flag.
> +
> + rockchip_pcie_enable_ltssm(rockchip);
> +
> + /*
> + * PCIe requires the refclk to be stable for 100µs prior to releasing
> + * PERST. See table 2-4 in section 2.6.2 AC Specifications of the PCI
> + * Express Card Electromechanical Specification, 1.1. However, we don't
> + * know if the refclk is coming from RC's PHY or external OSC. If it's
> + * from RC, so enabling LTSSM is the just right place to release #PERST.
> + * We need more extra time as before, rather than setting just
> + * 100us as we don't know how long should the device need to reset.
> + */
> + msleep(100);
> + gpiod_set_value_cansleep(rockchip->rst_gpio, 1);
> +
> + return 0;
> +}
> +
> +static int rockchip_pcie_host_init(struct pcie_port *pp)
> +{
> + struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
> + struct rockchip_pcie *rockchip = to_rockchip_pcie(pci);
> + u32 val;
> +
> + /* LTSSM enable control mode */
> + val = rockchip_pcie_readl_apb(rockchip, PCIE_CLIENT_HOT_RESET_CTRL);
> + val |= PCIE_LTSSM_ENABLE_ENHANCE | (PCIE_LTSSM_ENABLE_ENHANCE << 16);
Since you have a write mask, why do you need to do a read-mod-write?
And why not use HIWORD_UPDATE_BIT?
> + rockchip_pcie_writel_apb(rockchip, val, PCIE_CLIENT_HOT_RESET_CTRL);
> +
> + rockchip_pcie_writel_apb(rockchip, PCIE_CLIENT_RC_MODE,
> + PCIE_CLIENT_GENERAL_CONTROL);
> +
> + return 0;
> +}
^ permalink raw reply [flat|nested] 16+ messages in thread
* Re: [PATCH v9 2/2] PCI: rockchip: Add Rockchip RK356X host controller driver
@ 2021-06-23 21:15 ` Rob Herring
0 siblings, 0 replies; 16+ messages in thread
From: Rob Herring @ 2021-06-23 21:15 UTC (permalink / raw)
To: Simon Xue
Cc: Bjorn Helgaas, Lorenzo Pieralisi, linux-pci, linux-rockchip,
devicetree, Johan Jonker, Heiko Stuebner, Peter Geis, Kever Yang,
kernel test robot, Shawn Lin
== On Wed, May 5, 2021 at 8:35 PM Simon Xue <xxm@rock-chips.com> wrote:
>
> Add a driver for the DesignWare-based PCIe controller found on
> RK356X. The existing pcie-rockchip-host driver is only used for
> the Rockchip-designed IP found on RK3399.
>
> Tested-by: Peter Geis <pgwipeout@gmail.com>
> Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
> Reported-by: kernel test robot <lkp@intel.com>
> Signed-off-by: Simon Xue <xxm@rock-chips.com>
> Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
> ---
> drivers/pci/controller/dwc/Kconfig | 11 +
> drivers/pci/controller/dwc/Makefile | 1 +
> drivers/pci/controller/dwc/pcie-dw-rockchip.c | 277 ++++++++++++++++++
> 3 files changed, 289 insertions(+)
> create mode 100644 drivers/pci/controller/dwc/pcie-dw-rockchip.c
>
> diff --git a/drivers/pci/controller/dwc/Kconfig b/drivers/pci/controller/dwc/Kconfig
> index 423d35872ce4..60d3dde9ca39 100644
> --- a/drivers/pci/controller/dwc/Kconfig
> +++ b/drivers/pci/controller/dwc/Kconfig
> @@ -214,6 +214,17 @@ config PCIE_ARTPEC6_EP
> Enables support for the PCIe controller in the ARTPEC-6 SoC to work in
> endpoint mode. This uses the DesignWare core.
>
> +config PCIE_ROCKCHIP_DW_HOST
> + bool "Rockchip DesignWare PCIe controller"
> + select PCIE_DW
> + select PCIE_DW_HOST
> + depends on PCI_MSI_IRQ_DOMAIN
> + depends on ARCH_ROCKCHIP || COMPILE_TEST
> + depends on OF
> + help
> + Enables support for the DesignWare PCIe controller in the
> + Rockchip SoC except RK3399.
> +
> config PCIE_INTEL_GW
> bool "Intel Gateway PCIe host controller support"
> depends on OF && (X86 || COMPILE_TEST)
> diff --git a/drivers/pci/controller/dwc/Makefile b/drivers/pci/controller/dwc/Makefile
> index eca805c1a023..689b06a7d334 100644
> --- a/drivers/pci/controller/dwc/Makefile
> +++ b/drivers/pci/controller/dwc/Makefile
> @@ -14,6 +14,7 @@ obj-$(CONFIG_PCI_LAYERSCAPE_EP) += pci-layerscape-ep.o
> obj-$(CONFIG_PCIE_QCOM) += pcie-qcom.o
> obj-$(CONFIG_PCIE_ARMADA_8K) += pcie-armada8k.o
> obj-$(CONFIG_PCIE_ARTPEC6) += pcie-artpec6.o
> +obj-$(CONFIG_PCIE_ROCKCHIP_DW_HOST) += pcie-dw-rockchip.o
> obj-$(CONFIG_PCIE_INTEL_GW) += pcie-intel-gw.o
> obj-$(CONFIG_PCIE_KIRIN) += pcie-kirin.o
> obj-$(CONFIG_PCIE_HISI_STB) += pcie-histb.o
> diff --git a/drivers/pci/controller/dwc/pcie-dw-rockchip.c b/drivers/pci/controller/dwc/pcie-dw-rockchip.c
> new file mode 100644
> index 000000000000..3f060144eeab
> --- /dev/null
> +++ b/drivers/pci/controller/dwc/pcie-dw-rockchip.c
> @@ -0,0 +1,277 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * PCIe host controller driver for Rockchip SoCs.
> + *
> + * Copyright (C) 2021 Rockchip Electronics Co., Ltd.
> + * http://www.rock-chips.com
> + *
> + * Author: Simon Xue <xxm@rock-chips.com>
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/mfd/syscon.h>
> +#include <linux/module.h>
> +#include <linux/of_device.h>
> +#include <linux/phy/phy.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +#include <linux/reset.h>
> +
> +#include "pcie-designware.h"
> +
> +/*
> + * The upper 16 bits of PCIE_CLIENT_CONFIG are a write
> + * mask for the lower 16 bits.
> + */
> +#define HIWORD_UPDATE(mask, val) (((mask) << 16) | (val))
> +#define HIWORD_UPDATE_BIT(val) HIWORD_UPDATE(val, val)
> +
> +#define to_rockchip_pcie(x) dev_get_drvdata((x)->dev)
> +
> +#define PCIE_CLIENT_RC_MODE HIWORD_UPDATE_BIT(0x40)
> +#define PCIE_CLIENT_ENABLE_LTSSM HIWORD_UPDATE_BIT(0xc)
> +#define PCIE_SMLH_LINKUP BIT(16)
> +#define PCIE_RDLH_LINKUP BIT(17)
> +#define PCIE_LINKUP (PCIE_SMLH_LINKUP | PCIE_RDLH_LINKUP)
> +#define PCIE_L0S_ENTRY 0x11
> +#define PCIE_CLIENT_GENERAL_CONTROL 0x0
> +#define PCIE_CLIENT_GENERAL_DEBUG 0x104
> +#define PCIE_CLIENT_HOT_RESET_CTRL 0x180
> +#define PCIE_CLIENT_LTSSM_STATUS 0x300
> +#define PCIE_LTSSM_ENABLE_ENHANCE BIT(4)
> +
> +struct rockchip_pcie {
> + struct dw_pcie pci;
> + void __iomem *apb_base;
> + struct phy *phy;
> + struct clk_bulk_data *clks;
> + unsigned int clk_cnt;
> + struct reset_control *rst;
> + struct gpio_desc *rst_gpio;
> + struct regulator *vpcie3v3;
> +};
> +
> +static int rockchip_pcie_readl_apb(struct rockchip_pcie *rockchip,
> + u32 reg)
> +{
> + return readl(rockchip->apb_base + reg);
Use _relaxed variant.
> +}
> +
> +static void rockchip_pcie_writel_apb(struct rockchip_pcie *rockchip,
> + u32 val, u32 reg)
> +{
> + writel(val, rockchip->apb_base + reg);
Use _relaxed variant.
> +}
> +
> +static void rockchip_pcie_enable_ltssm(struct rockchip_pcie *rockchip)
> +{
> + rockchip_pcie_writel_apb(rockchip, PCIE_CLIENT_ENABLE_LTSSM,
> + PCIE_CLIENT_GENERAL_CONTROL);
> +}
> +
> +static int rockchip_pcie_link_up(struct dw_pcie *pci)
> +{
> + struct rockchip_pcie *rockchip = to_rockchip_pcie(pci);
> + u32 val = rockchip_pcie_readl_apb(rockchip, PCIE_CLIENT_LTSSM_STATUS);
> +
> + if ((val & (PCIE_RDLH_LINKUP | PCIE_SMLH_LINKUP)) == PCIE_LINKUP &&
((val & PCIE_LINKUP) == PCIE_LINKUP)
> + (val & GENMASK(5, 0)) == PCIE_L0S_ENTRY)
Perhaps a define for GENMASK(5, 0)
> + return 1;
> +
> + return 0;
> +}
> +
> +static int rockchip_pcie_start_link(struct dw_pcie *pci)
> +{
> + struct rockchip_pcie *rockchip = to_rockchip_pcie(pci);
> +
> + /* Reset device */
> + gpiod_set_value_cansleep(rockchip->rst_gpio, 0);
With gpiod, 0 means inactive which is reset deasserted. Your DT should
have an ACTIVE_LOW flag.
> +
> + rockchip_pcie_enable_ltssm(rockchip);
> +
> + /*
> + * PCIe requires the refclk to be stable for 100µs prior to releasing
> + * PERST. See table 2-4 in section 2.6.2 AC Specifications of the PCI
> + * Express Card Electromechanical Specification, 1.1. However, we don't
> + * know if the refclk is coming from RC's PHY or external OSC. If it's
> + * from RC, so enabling LTSSM is the just right place to release #PERST.
> + * We need more extra time as before, rather than setting just
> + * 100us as we don't know how long should the device need to reset.
> + */
> + msleep(100);
> + gpiod_set_value_cansleep(rockchip->rst_gpio, 1);
> +
> + return 0;
> +}
> +
> +static int rockchip_pcie_host_init(struct pcie_port *pp)
> +{
> + struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
> + struct rockchip_pcie *rockchip = to_rockchip_pcie(pci);
> + u32 val;
> +
> + /* LTSSM enable control mode */
> + val = rockchip_pcie_readl_apb(rockchip, PCIE_CLIENT_HOT_RESET_CTRL);
> + val |= PCIE_LTSSM_ENABLE_ENHANCE | (PCIE_LTSSM_ENABLE_ENHANCE << 16);
Since you have a write mask, why do you need to do a read-mod-write?
And why not use HIWORD_UPDATE_BIT?
> + rockchip_pcie_writel_apb(rockchip, val, PCIE_CLIENT_HOT_RESET_CTRL);
> +
> + rockchip_pcie_writel_apb(rockchip, PCIE_CLIENT_RC_MODE,
> + PCIE_CLIENT_GENERAL_CONTROL);
> +
> + return 0;
> +}
_______________________________________________
Linux-rockchip mailing list
Linux-rockchip@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-rockchip
^ permalink raw reply [flat|nested] 16+ messages in thread
* Re: [PATCH v9 2/2] PCI: rockchip: Add Rockchip RK356X host controller driver
2021-06-23 14:33 ` Lorenzo Pieralisi
@ 2021-06-24 2:08 ` xxm
-1 siblings, 0 replies; 16+ messages in thread
From: xxm @ 2021-06-24 2:08 UTC (permalink / raw)
To: Lorenzo Pieralisi, pali
Cc: Bjorn Helgaas, linux-pci, linux-rockchip, devicetree, robh+dt,
Johan Jonker, Heiko Stuebner, Peter Geis, Kever Yang,
kernel test robot, Shawn Lin
Hi，
在 2021/6/23 22:33, Lorenzo Pieralisi 写道:
> [+Pali]
>
> On Thu, May 06, 2021 at 10:35:44AM +0800, Simon Xue wrote:
>> Add a driver for the DesignWare-based PCIe controller found on
>> RK356X. The existing pcie-rockchip-host driver is only used for
>> the Rockchip-designed IP found on RK3399.
>>
>> Tested-by: Peter Geis <pgwipeout@gmail.com>
>> Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
>> Reported-by: kernel test robot <lkp@intel.com>
> I will remove this tag - it does not make sense on a patch adding
> a new driver.
>
> [...]
>
>> +static int rockchip_pcie_start_link(struct dw_pcie *pci)
>> +{
>> + struct rockchip_pcie *rockchip = to_rockchip_pcie(pci);
>> +
>> + /* Reset device */
>> + gpiod_set_value_cansleep(rockchip->rst_gpio, 0);
>> +
>> + rockchip_pcie_enable_ltssm(rockchip);
>> +
>> + /*
>> + * PCIe requires the refclk to be stable for 100µs prior to releasing
>> + * PERST. See table 2-4 in section 2.6.2 AC Specifications of the PCI
>> + * Express Card Electromechanical Specification, 1.1. However, we don't
>> + * know if the refclk is coming from RC's PHY or external OSC. If it's
>> + * from RC, so enabling LTSSM is the just right place to release #PERST.
>> + * We need more extra time as before, rather than setting just
>> + * 100us as we don't know how long should the device need to reset.
>> + */
>> + msleep(100);
> Any rationale behind the time chosen ?
We found some device need about 30ms, so 100ms here just leave more room
for other devices.
> Ongoing discussion:
>
> https://lore.kernel.org/linux-pci/20210531090540.2663171-1-luca@lucaceresoli.net
>
> Lorenzo
>
>> + gpiod_set_value_cansleep(rockchip->rst_gpio, 1);
>> +
>> + return 0;
>> +}
>> +
>> +static int rockchip_pcie_host_init(struct pcie_port *pp)
>> +{
>> + struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
>> + struct rockchip_pcie *rockchip = to_rockchip_pcie(pci);
>> + u32 val;
>> +
>> + /* LTSSM enable control mode */
>> + val = rockchip_pcie_readl_apb(rockchip, PCIE_CLIENT_HOT_RESET_CTRL);
>> + val |= PCIE_LTSSM_ENABLE_ENHANCE | (PCIE_LTSSM_ENABLE_ENHANCE << 16);
>> + rockchip_pcie_writel_apb(rockchip, val, PCIE_CLIENT_HOT_RESET_CTRL);
>> +
>> + rockchip_pcie_writel_apb(rockchip, PCIE_CLIENT_RC_MODE,
>> + PCIE_CLIENT_GENERAL_CONTROL);
>> +
>> + return 0;
>> +}
>> +
>> +static const struct dw_pcie_host_ops rockchip_pcie_host_ops = {
>> + .host_init = rockchip_pcie_host_init,
>> +};
>> +
>> +static int rockchip_pcie_clk_init(struct rockchip_pcie *rockchip)
>> +{
>> + struct device *dev = rockchip->pci.dev;
>> + int ret;
>> +
>> + ret = devm_clk_bulk_get_all(dev, &rockchip->clks);
>> + if (ret < 0)
>> + return ret;
>> +
>> + rockchip->clk_cnt = ret;
>> +
>> + return clk_bulk_prepare_enable(rockchip->clk_cnt, rockchip->clks);
>> +}
>> +
>> +static int rockchip_pcie_resource_get(struct platform_device *pdev,
>> + struct rockchip_pcie *rockchip)
>> +{
>> + rockchip->apb_base = devm_platform_ioremap_resource_byname(pdev, "apb");
>> + if (IS_ERR(rockchip->apb_base))
>> + return PTR_ERR(rockchip->apb_base);
>> +
>> + rockchip->rst_gpio = devm_gpiod_get_optional(&pdev->dev, "reset",
>> + GPIOD_OUT_HIGH);
>> + if (IS_ERR(rockchip->rst_gpio))
>> + return PTR_ERR(rockchip->rst_gpio);
>> +
>> + return 0;
>> +}
>> +
>> +static int rockchip_pcie_phy_init(struct rockchip_pcie *rockchip)
>> +{
>> + struct device *dev = rockchip->pci.dev;
>> + int ret;
>> +
>> + rockchip->phy = devm_phy_get(dev, "pcie-phy");
>> + if (IS_ERR(rockchip->phy))
>> + return dev_err_probe(dev, PTR_ERR(rockchip->phy),
>> + "missing PHY\n");
>> +
>> + ret = phy_init(rockchip->phy);
>> + if (ret < 0)
>> + return ret;
>> +
>> + ret = phy_power_on(rockchip->phy);
>> + if (ret)
>> + phy_exit(rockchip->phy);
>> +
>> + return ret;
>> +}
>> +
>> +static void rockchip_pcie_phy_deinit(struct rockchip_pcie *rockchip)
>> +{
>> + phy_exit(rockchip->phy);
>> + phy_power_off(rockchip->phy);
>> +}
>> +
>> +static int rockchip_pcie_reset_control_release(struct rockchip_pcie *rockchip)
>> +{
>> + struct device *dev = rockchip->pci.dev;
>> +
>> + rockchip->rst = devm_reset_control_array_get_exclusive(dev);
>> + if (IS_ERR(rockchip->rst))
>> + return dev_err_probe(dev, PTR_ERR(rockchip->rst),
>> + "failed to get reset lines\n");
>> +
>> + return reset_control_deassert(rockchip->rst);
>> +}
>> +
>> +static const struct dw_pcie_ops dw_pcie_ops = {
>> + .link_up = rockchip_pcie_link_up,
>> + .start_link = rockchip_pcie_start_link,
>> +};
>> +
>> +static int rockchip_pcie_probe(struct platform_device *pdev)
>> +{
>> + struct device *dev = &pdev->dev;
>> + struct rockchip_pcie *rockchip;
>> + struct pcie_port *pp;
>> + int ret;
>> +
>> + rockchip = devm_kzalloc(dev, sizeof(*rockchip), GFP_KERNEL);
>> + if (!rockchip)
>> + return -ENOMEM;
>> +
>> + platform_set_drvdata(pdev, rockchip);
>> +
>> + rockchip->pci.dev = dev;
>> + rockchip->pci.ops = &dw_pcie_ops;
>> +
>> + pp = &rockchip->pci.pp;
>> + pp->ops = &rockchip_pcie_host_ops;
>> +
>> + ret = rockchip_pcie_resource_get(pdev, rockchip);
>> + if (ret)
>> + return ret;
>> +
>> + /* DON'T MOVE ME: must be enable before PHY init */
>> + rockchip->vpcie3v3 = devm_regulator_get_optional(dev, "vpcie3v3");
>> + if (IS_ERR(rockchip->vpcie3v3))
>> + if (PTR_ERR(rockchip->vpcie3v3) != -ENODEV)
>> + return dev_err_probe(dev, PTR_ERR(rockchip->vpcie3v3),
>> + "failed to get vpcie3v3 regulator\n");
>> +
>> + ret = regulator_enable(rockchip->vpcie3v3);
>> + if (ret) {
>> + dev_err(dev, "failed to enable vpcie3v3 regulator\n");
>> + return ret;
>> + }
>> +
>> + ret = rockchip_pcie_phy_init(rockchip);
>> + if (ret)
>> + goto disable_regulator;
>> +
>> + ret = rockchip_pcie_reset_control_release(rockchip);
>> + if (ret)
>> + goto deinit_phy;
>> +
>> + ret = rockchip_pcie_clk_init(rockchip);
>> + if (ret)
>> + goto deinit_phy;
>> +
>> + ret = dw_pcie_host_init(pp);
>> + if (!ret)
>> + return 0;
>> +
>> + clk_bulk_disable_unprepare(rockchip->clk_cnt, rockchip->clks);
>> +deinit_phy:
>> + rockchip_pcie_phy_deinit(rockchip);
>> +disable_regulator:
>> + regulator_disable(rockchip->vpcie3v3);
>> +
>> + return ret;
>> +}
>> +
>> +static const struct of_device_id rockchip_pcie_of_match[] = {
>> + { .compatible = "rockchip,rk3568-pcie", },
>> + {},
>> +};
>> +
>> +static struct platform_driver rockchip_pcie_driver = {
>> + .driver = {
>> + .name = "rockchip-dw-pcie",
>> + .of_match_table = rockchip_pcie_of_match,
>> + .suppress_bind_attrs = true,
>> + },
>> + .probe = rockchip_pcie_probe,
>> +};
>> +builtin_platform_driver(rockchip_pcie_driver);
>> --
>> 2.25.1
>>
>>
>>
>
>
^ permalink raw reply [flat|nested] 16+ messages in thread
* Re: [PATCH v9 2/2] PCI: rockchip: Add Rockchip RK356X host controller driver
@ 2021-06-24 2:08 ` xxm
0 siblings, 0 replies; 16+ messages in thread
From: xxm @ 2021-06-24 2:08 UTC (permalink / raw)
To: Lorenzo Pieralisi, pali
Cc: Bjorn Helgaas, linux-pci, linux-rockchip, devicetree, robh+dt,
Johan Jonker, Heiko Stuebner, Peter Geis, Kever Yang,
kernel test robot, Shawn Lin
Hi，
在 2021/6/23 22:33, Lorenzo Pieralisi 写道:
> [+Pali]
>
> On Thu, May 06, 2021 at 10:35:44AM +0800, Simon Xue wrote:
>> Add a driver for the DesignWare-based PCIe controller found on
>> RK356X. The existing pcie-rockchip-host driver is only used for
>> the Rockchip-designed IP found on RK3399.
>>
>> Tested-by: Peter Geis <pgwipeout@gmail.com>
>> Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
>> Reported-by: kernel test robot <lkp@intel.com>
> I will remove this tag - it does not make sense on a patch adding
> a new driver.
>
> [...]
>
>> +static int rockchip_pcie_start_link(struct dw_pcie *pci)
>> +{
>> + struct rockchip_pcie *rockchip = to_rockchip_pcie(pci);
>> +
>> + /* Reset device */
>> + gpiod_set_value_cansleep(rockchip->rst_gpio, 0);
>> +
>> + rockchip_pcie_enable_ltssm(rockchip);
>> +
>> + /*
>> + * PCIe requires the refclk to be stable for 100µs prior to releasing
>> + * PERST. See table 2-4 in section 2.6.2 AC Specifications of the PCI
>> + * Express Card Electromechanical Specification, 1.1. However, we don't
>> + * know if the refclk is coming from RC's PHY or external OSC. If it's
>> + * from RC, so enabling LTSSM is the just right place to release #PERST.
>> + * We need more extra time as before, rather than setting just
>> + * 100us as we don't know how long should the device need to reset.
>> + */
>> + msleep(100);
> Any rationale behind the time chosen ?
We found some device need about 30ms, so 100ms here just leave more room
for other devices.
> Ongoing discussion:
>
> https://lore.kernel.org/linux-pci/20210531090540.2663171-1-luca@lucaceresoli.net
>
> Lorenzo
>
>> + gpiod_set_value_cansleep(rockchip->rst_gpio, 1);
>> +
>> + return 0;
>> +}
>> +
>> +static int rockchip_pcie_host_init(struct pcie_port *pp)
>> +{
>> + struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
>> + struct rockchip_pcie *rockchip = to_rockchip_pcie(pci);
>> + u32 val;
>> +
>> + /* LTSSM enable control mode */
>> + val = rockchip_pcie_readl_apb(rockchip, PCIE_CLIENT_HOT_RESET_CTRL);
>> + val |= PCIE_LTSSM_ENABLE_ENHANCE | (PCIE_LTSSM_ENABLE_ENHANCE << 16);
>> + rockchip_pcie_writel_apb(rockchip, val, PCIE_CLIENT_HOT_RESET_CTRL);
>> +
>> + rockchip_pcie_writel_apb(rockchip, PCIE_CLIENT_RC_MODE,
>> + PCIE_CLIENT_GENERAL_CONTROL);
>> +
>> + return 0;
>> +}
>> +
>> +static const struct dw_pcie_host_ops rockchip_pcie_host_ops = {
>> + .host_init = rockchip_pcie_host_init,
>> +};
>> +
>> +static int rockchip_pcie_clk_init(struct rockchip_pcie *rockchip)
>> +{
>> + struct device *dev = rockchip->pci.dev;
>> + int ret;
>> +
>> + ret = devm_clk_bulk_get_all(dev, &rockchip->clks);
>> + if (ret < 0)
>> + return ret;
>> +
>> + rockchip->clk_cnt = ret;
>> +
>> + return clk_bulk_prepare_enable(rockchip->clk_cnt, rockchip->clks);
>> +}
>> +
>> +static int rockchip_pcie_resource_get(struct platform_device *pdev,
>> + struct rockchip_pcie *rockchip)
>> +{
>> + rockchip->apb_base = devm_platform_ioremap_resource_byname(pdev, "apb");
>> + if (IS_ERR(rockchip->apb_base))
>> + return PTR_ERR(rockchip->apb_base);
>> +
>> + rockchip->rst_gpio = devm_gpiod_get_optional(&pdev->dev, "reset",
>> + GPIOD_OUT_HIGH);
>> + if (IS_ERR(rockchip->rst_gpio))
>> + return PTR_ERR(rockchip->rst_gpio);
>> +
>> + return 0;
>> +}
>> +
>> +static int rockchip_pcie_phy_init(struct rockchip_pcie *rockchip)
>> +{
>> + struct device *dev = rockchip->pci.dev;
>> + int ret;
>> +
>> + rockchip->phy = devm_phy_get(dev, "pcie-phy");
>> + if (IS_ERR(rockchip->phy))
>> + return dev_err_probe(dev, PTR_ERR(rockchip->phy),
>> + "missing PHY\n");
>> +
>> + ret = phy_init(rockchip->phy);
>> + if (ret < 0)
>> + return ret;
>> +
>> + ret = phy_power_on(rockchip->phy);
>> + if (ret)
>> + phy_exit(rockchip->phy);
>> +
>> + return ret;
>> +}
>> +
>> +static void rockchip_pcie_phy_deinit(struct rockchip_pcie *rockchip)
>> +{
>> + phy_exit(rockchip->phy);
>> + phy_power_off(rockchip->phy);
>> +}
>> +
>> +static int rockchip_pcie_reset_control_release(struct rockchip_pcie *rockchip)
>> +{
>> + struct device *dev = rockchip->pci.dev;
>> +
>> + rockchip->rst = devm_reset_control_array_get_exclusive(dev);
>> + if (IS_ERR(rockchip->rst))
>> + return dev_err_probe(dev, PTR_ERR(rockchip->rst),
>> + "failed to get reset lines\n");
>> +
>> + return reset_control_deassert(rockchip->rst);
>> +}
>> +
>> +static const struct dw_pcie_ops dw_pcie_ops = {
>> + .link_up = rockchip_pcie_link_up,
>> + .start_link = rockchip_pcie_start_link,
>> +};
>> +
>> +static int rockchip_pcie_probe(struct platform_device *pdev)
>> +{
>> + struct device *dev = &pdev->dev;
>> + struct rockchip_pcie *rockchip;
>> + struct pcie_port *pp;
>> + int ret;
>> +
>> + rockchip = devm_kzalloc(dev, sizeof(*rockchip), GFP_KERNEL);
>> + if (!rockchip)
>> + return -ENOMEM;
>> +
>> + platform_set_drvdata(pdev, rockchip);
>> +
>> + rockchip->pci.dev = dev;
>> + rockchip->pci.ops = &dw_pcie_ops;
>> +
>> + pp = &rockchip->pci.pp;
>> + pp->ops = &rockchip_pcie_host_ops;
>> +
>> + ret = rockchip_pcie_resource_get(pdev, rockchip);
>> + if (ret)
>> + return ret;
>> +
>> + /* DON'T MOVE ME: must be enable before PHY init */
>> + rockchip->vpcie3v3 = devm_regulator_get_optional(dev, "vpcie3v3");
>> + if (IS_ERR(rockchip->vpcie3v3))
>> + if (PTR_ERR(rockchip->vpcie3v3) != -ENODEV)
>> + return dev_err_probe(dev, PTR_ERR(rockchip->vpcie3v3),
>> + "failed to get vpcie3v3 regulator\n");
>> +
>> + ret = regulator_enable(rockchip->vpcie3v3);
>> + if (ret) {
>> + dev_err(dev, "failed to enable vpcie3v3 regulator\n");
>> + return ret;
>> + }
>> +
>> + ret = rockchip_pcie_phy_init(rockchip);
>> + if (ret)
>> + goto disable_regulator;
>> +
>> + ret = rockchip_pcie_reset_control_release(rockchip);
>> + if (ret)
>> + goto deinit_phy;
>> +
>> + ret = rockchip_pcie_clk_init(rockchip);
>> + if (ret)
>> + goto deinit_phy;
>> +
>> + ret = dw_pcie_host_init(pp);
>> + if (!ret)
>> + return 0;
>> +
>> + clk_bulk_disable_unprepare(rockchip->clk_cnt, rockchip->clks);
>> +deinit_phy:
>> + rockchip_pcie_phy_deinit(rockchip);
>> +disable_regulator:
>> + regulator_disable(rockchip->vpcie3v3);
>> +
>> + return ret;
>> +}
>> +
>> +static const struct of_device_id rockchip_pcie_of_match[] = {
>> + { .compatible = "rockchip,rk3568-pcie", },
>> + {},
>> +};
>> +
>> +static struct platform_driver rockchip_pcie_driver = {
>> + .driver = {
>> + .name = "rockchip-dw-pcie",
>> + .of_match_table = rockchip_pcie_of_match,
>> + .suppress_bind_attrs = true,
>> + },
>> + .probe = rockchip_pcie_probe,
>> +};
>> +builtin_platform_driver(rockchip_pcie_driver);
>> --
>> 2.25.1
>>
>>
>>
>
>
_______________________________________________
Linux-rockchip mailing list
Linux-rockchip@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-rockchip
^ permalink raw reply [flat|nested] 16+ messages in thread
* Re: [PATCH v9 2/2] PCI: rockchip: Add Rockchip RK356X host controller driver
2021-06-24 2:08 ` xxm
@ 2021-06-24 8:23 ` Pali Rohár
-1 siblings, 0 replies; 16+ messages in thread
From: Pali Rohár @ 2021-06-24 8:23 UTC (permalink / raw)
To: xxm
Cc: Lorenzo Pieralisi, Bjorn Helgaas, linux-pci, linux-rockchip,
devicetree, robh+dt, Johan Jonker, Heiko Stuebner, Peter Geis,
Kever Yang, kernel test robot, Shawn Lin
On Thursday 24 June 2021 10:08:54 xxm wrote:
> 在 2021/6/23 22:33, Lorenzo Pieralisi 写道:
> > On Thu, May 06, 2021 at 10:35:44AM +0800, Simon Xue wrote:
> > > +static int rockchip_pcie_start_link(struct dw_pcie *pci)
> > > +{
> > > + struct rockchip_pcie *rockchip = to_rockchip_pcie(pci);
> > > +
> > > + /* Reset device */
> > > + gpiod_set_value_cansleep(rockchip->rst_gpio, 0);
> > > +
> > > + rockchip_pcie_enable_ltssm(rockchip);
> > > +
> > > + /*
> > > + * PCIe requires the refclk to be stable for 100µs prior to releasing
> > > + * PERST. See table 2-4 in section 2.6.2 AC Specifications of the PCI
> > > + * Express Card Electromechanical Specification, 1.1. However, we don't
> > > + * know if the refclk is coming from RC's PHY or external OSC. If it's
> > > + * from RC, so enabling LTSSM is the just right place to release #PERST.
> > > + * We need more extra time as before, rather than setting just
> > > + * 100us as we don't know how long should the device need to reset.
> > > + */
> > > + msleep(100);
> > Any rationale behind the time chosen ?
> We found some device need about 30ms, so 100ms here just leave more room for
> other devices.
Can you share information which PCIe card needs 30ms?
Last year I did tests with more WiFi AC cards and "the slowest" one was
Compex WLE1216 which needed about 11ms (more than 10ms). All other cards
were happy with just 1-2ms.
^ permalink raw reply [flat|nested] 16+ messages in thread
* Re: [PATCH v9 2/2] PCI: rockchip: Add Rockchip RK356X host controller driver
@ 2021-06-24 8:23 ` Pali Rohár
0 siblings, 0 replies; 16+ messages in thread
From: Pali Rohár @ 2021-06-24 8:23 UTC (permalink / raw)
To: xxm
Cc: Lorenzo Pieralisi, Bjorn Helgaas, linux-pci, linux-rockchip,
devicetree, robh+dt, Johan Jonker, Heiko Stuebner, Peter Geis,
Kever Yang, kernel test robot, Shawn Lin
On Thursday 24 June 2021 10:08:54 xxm wrote:
> 在 2021/6/23 22:33, Lorenzo Pieralisi 写道:
> > On Thu, May 06, 2021 at 10:35:44AM +0800, Simon Xue wrote:
> > > +static int rockchip_pcie_start_link(struct dw_pcie *pci)
> > > +{
> > > + struct rockchip_pcie *rockchip = to_rockchip_pcie(pci);
> > > +
> > > + /* Reset device */
> > > + gpiod_set_value_cansleep(rockchip->rst_gpio, 0);
> > > +
> > > + rockchip_pcie_enable_ltssm(rockchip);
> > > +
> > > + /*
> > > + * PCIe requires the refclk to be stable for 100µs prior to releasing
> > > + * PERST. See table 2-4 in section 2.6.2 AC Specifications of the PCI
> > > + * Express Card Electromechanical Specification, 1.1. However, we don't
> > > + * know if the refclk is coming from RC's PHY or external OSC. If it's
> > > + * from RC, so enabling LTSSM is the just right place to release #PERST.
> > > + * We need more extra time as before, rather than setting just
> > > + * 100us as we don't know how long should the device need to reset.
> > > + */
> > > + msleep(100);
> > Any rationale behind the time chosen ?
> We found some device need about 30ms, so 100ms here just leave more room for
> other devices.
Can you share information which PCIe card needs 30ms?
Last year I did tests with more WiFi AC cards and "the slowest" one was
Compex WLE1216 which needed about 11ms (more than 10ms). All other cards
were happy with just 1-2ms.
_______________________________________________
Linux-rockchip mailing list
Linux-rockchip@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-rockchip
^ permalink raw reply [flat|nested] 16+ messages in thread
* Re: [PATCH v9 2/2] PCI: rockchip: Add Rockchip RK356X host controller driver
2021-06-24 8:23 ` Pali Rohár
@ 2021-06-24 8:58 ` xxm
-1 siblings, 0 replies; 16+ messages in thread
From: xxm @ 2021-06-24 8:58 UTC (permalink / raw)
To: Pali Rohár
Cc: Lorenzo Pieralisi, Bjorn Helgaas, linux-pci, linux-rockchip,
devicetree, robh+dt, Johan Jonker, Heiko Stuebner, Peter Geis,
Kever Yang, kernel test robot, Shawn Lin
Hi,
在 2021/6/24 16:23, Pali Rohár 写道:
> On Thursday 24 June 2021 10:08:54 xxm wrote:
>> 在 2021/6/23 22:33, Lorenzo Pieralisi 写道:
>>> On Thu, May 06, 2021 at 10:35:44AM +0800, Simon Xue wrote:
>>>> +static int rockchip_pcie_start_link(struct dw_pcie *pci)
>>>> +{
>>>> + struct rockchip_pcie *rockchip = to_rockchip_pcie(pci);
>>>> +
>>>> + /* Reset device */
>>>> + gpiod_set_value_cansleep(rockchip->rst_gpio, 0);
>>>> +
>>>> + rockchip_pcie_enable_ltssm(rockchip);
>>>> +
>>>> + /*
>>>> + * PCIe requires the refclk to be stable for 100µs prior to releasing
>>>> + * PERST. See table 2-4 in section 2.6.2 AC Specifications of the PCI
>>>> + * Express Card Electromechanical Specification, 1.1. However, we don't
>>>> + * know if the refclk is coming from RC's PHY or external OSC. If it's
>>>> + * from RC, so enabling LTSSM is the just right place to release #PERST.
>>>> + * We need more extra time as before, rather than setting just
>>>> + * 100us as we don't know how long should the device need to reset.
>>>> + */
>>>> + msleep(100);
>>> Any rationale behind the time chosen ?
>> We found some device need about 30ms, so 100ms here just leave more room for
>> other devices.
> Can you share information which PCIe card needs 30ms?
>
> Last year I did tests with more WiFi AC cards and "the slowest" one was
> Compex WLE1216 which needed about 11ms (more than 10ms). All other cards
> were happy with just 1-2ms.
Sorry, it was about 5 years ago, I can't find the specific card now.
By the way, we also take other's upstream code "msleep(100)" as a reference.
>
>
^ permalink raw reply [flat|nested] 16+ messages in thread
* Re: [PATCH v9 2/2] PCI: rockchip: Add Rockchip RK356X host controller driver
@ 2021-06-24 8:58 ` xxm
0 siblings, 0 replies; 16+ messages in thread
From: xxm @ 2021-06-24 8:58 UTC (permalink / raw)
To: Pali Rohár
Cc: Lorenzo Pieralisi, Bjorn Helgaas, linux-pci, linux-rockchip,
devicetree, robh+dt, Johan Jonker, Heiko Stuebner, Peter Geis,
Kever Yang, kernel test robot, Shawn Lin
Hi,
在 2021/6/24 16:23, Pali Rohár 写道:
> On Thursday 24 June 2021 10:08:54 xxm wrote:
>> 在 2021/6/23 22:33, Lorenzo Pieralisi 写道:
>>> On Thu, May 06, 2021 at 10:35:44AM +0800, Simon Xue wrote:
>>>> +static int rockchip_pcie_start_link(struct dw_pcie *pci)
>>>> +{
>>>> + struct rockchip_pcie *rockchip = to_rockchip_pcie(pci);
>>>> +
>>>> + /* Reset device */
>>>> + gpiod_set_value_cansleep(rockchip->rst_gpio, 0);
>>>> +
>>>> + rockchip_pcie_enable_ltssm(rockchip);
>>>> +
>>>> + /*
>>>> + * PCIe requires the refclk to be stable for 100µs prior to releasing
>>>> + * PERST. See table 2-4 in section 2.6.2 AC Specifications of the PCI
>>>> + * Express Card Electromechanical Specification, 1.1. However, we don't
>>>> + * know if the refclk is coming from RC's PHY or external OSC. If it's
>>>> + * from RC, so enabling LTSSM is the just right place to release #PERST.
>>>> + * We need more extra time as before, rather than setting just
>>>> + * 100us as we don't know how long should the device need to reset.
>>>> + */
>>>> + msleep(100);
>>> Any rationale behind the time chosen ?
>> We found some device need about 30ms, so 100ms here just leave more room for
>> other devices.
> Can you share information which PCIe card needs 30ms?
>
> Last year I did tests with more WiFi AC cards and "the slowest" one was
> Compex WLE1216 which needed about 11ms (more than 10ms). All other cards
> were happy with just 1-2ms.
Sorry, it was about 5 years ago, I can't find the specific card now.
By the way, we also take other's upstream code "msleep(100)" as a reference.
>
>
_______________________________________________
Linux-rockchip mailing list
Linux-rockchip@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-rockchip
^ permalink raw reply [flat|nested] 16+ messages in thread
* Re: [PATCH v9 1/2] dt-bindings: rockchip: Add DesignWare based PCIe controller
2021-05-06 2:34 ` Simon Xue
@ 2021-10-27 15:41 ` Rob Herring
-1 siblings, 0 replies; 16+ messages in thread
From: Rob Herring @ 2021-10-27 15:41 UTC (permalink / raw)
To: Simon Xue
Cc: Bjorn Helgaas, Lorenzo Pieralisi, linux-pci, linux-rockchip,
devicetree, Johan Jonker, Heiko Stuebner, Kever Yang
On Thu, May 06, 2021 at 10:34:48AM +0800, Simon Xue wrote:
> Document DT bindings for PCIe controller found on Rockchip SoC.
>
> Reviewed-by: Rob Herring <robh@kernel.org>
> Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
> Signed-off-by: Simon Xue <xxm@rock-chips.com>
> ---
> .../bindings/pci/rockchip-dw-pcie.yaml | 141 ++++++++++++++++++
> 1 file changed, 141 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/pci/rockchip-dw-pcie.yaml
I don't know why this didn't get sent with subsequent versions, but it
should have. I've applied it now.
Rob
^ permalink raw reply [flat|nested] 16+ messages in thread
* Re: [PATCH v9 1/2] dt-bindings: rockchip: Add DesignWare based PCIe controller
@ 2021-10-27 15:41 ` Rob Herring
0 siblings, 0 replies; 16+ messages in thread
From: Rob Herring @ 2021-10-27 15:41 UTC (permalink / raw)
To: Simon Xue
Cc: Bjorn Helgaas, Lorenzo Pieralisi, linux-pci, linux-rockchip,
devicetree, Johan Jonker, Heiko Stuebner, Kever Yang
On Thu, May 06, 2021 at 10:34:48AM +0800, Simon Xue wrote:
> Document DT bindings for PCIe controller found on Rockchip SoC.
>
> Reviewed-by: Rob Herring <robh@kernel.org>
> Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
> Signed-off-by: Simon Xue <xxm@rock-chips.com>
> ---
> .../bindings/pci/rockchip-dw-pcie.yaml | 141 ++++++++++++++++++
> 1 file changed, 141 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/pci/rockchip-dw-pcie.yaml
I don't know why this didn't get sent with subsequent versions, but it
should have. I've applied it now.
Rob
_______________________________________________
Linux-rockchip mailing list
Linux-rockchip@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-rockchip
^ permalink raw reply [flat|nested] 16+ messages in thread
end of thread, other threads:[~2021-10-27 15:41 UTC | newest]
Thread overview: 16+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-05-06 2:34 [PATCH v9 1/2] dt-bindings: rockchip: Add DesignWare based PCIe controller Simon Xue
2021-05-06 2:34 ` Simon Xue
2021-05-06 2:35 ` [PATCH v9 2/2] PCI: rockchip: Add Rockchip RK356X host controller driver Simon Xue
2021-05-06 2:35 ` Simon Xue
2021-06-23 14:33 ` Lorenzo Pieralisi
2021-06-23 14:33 ` Lorenzo Pieralisi
2021-06-24 2:08 ` xxm
2021-06-24 2:08 ` xxm
2021-06-24 8:23 ` Pali Rohár
2021-06-24 8:23 ` Pali Rohár
2021-06-24 8:58 ` xxm
2021-06-24 8:58 ` xxm
2021-06-23 21:15 ` Rob Herring
2021-06-23 21:15 ` Rob Herring
2021-10-27 15:41 ` [PATCH v9 1/2] dt-bindings: rockchip: Add DesignWare based PCIe controller Rob Herring
2021-10-27 15:41 ` Rob Herring
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.