[PATCH v13 6/6] PCI: hisi: Add PCIe host support for HiSilicon SoC Hip05

From: Zhou Wang
Date: Thu Oct 29 2015 - 05:26:45 EST

This patch adds PCIe host support for HiSilicon SoC Hip05, related DT binding
document and maintainer update.

Signed-off-by: Zhou Wang <wangzhou1@xxxxxxxxxxxxx>
Signed-off-by: Gabriele Paoloni <gabriele.paoloni@xxxxxxxxxx>
Signed-off-by: liudongdong <liudongdong3@xxxxxxxxxx>
Acked-by: Rob Herring <robh@xxxxxxxxxx>
---
.../bindings/arm/hisilicon/hisilicon.txt | 17 ++
.../devicetree/bindings/pci/hisilicon-pcie.txt | 44 +++++
MAINTAINERS | 7 +
drivers/pci/host/Kconfig | 8 +
drivers/pci/host/Makefile | 1 +
drivers/pci/host/pcie-hisi.c | 198 +++++++++++++++++++++
6 files changed, 275 insertions(+)
create mode 100644 Documentation/devicetree/bindings/pci/hisilicon-pcie.txt
create mode 100644 drivers/pci/host/pcie-hisi.c

diff --git a/Documentation/devicetree/bindings/arm/hisilicon/hisilicon.txt b/Documentation/devicetree/bindings/arm/hisilicon/hisilicon.txt
index 3504dca..6ac7c00 100644
--- a/Documentation/devicetree/bindings/arm/hisilicon/hisilicon.txt
+++ b/Documentation/devicetree/bindings/arm/hisilicon/hisilicon.txt
@@ -171,6 +171,23 @@ Example:
};

-----------------------------------------------------------------------
+Hisilicon HiP05 PCIe-SAS system controller
+
+Required properties:
+- compatible : "hisilicon,pcie-sas-subctrl", "syscon";
+- reg : Register address and size
+
+The HiP05 PCIe-SAS system controller is shared by PCIe and SAS controllers in
+HiP05 Soc to implement some basic configurations.
+
+Example:
+ /* for HiP05 PCIe-SAS system */
+ pcie_sas: system_controller@0xb0000000 {
+ compatible = "hisilicon,pcie-sas-subctrl", "syscon";
+ reg = <0xb0000000 0x10000>;
+ };
+
+-----------------------------------------------------------------------
Hisilicon CPU controller

Required properties:
diff --git a/Documentation/devicetree/bindings/pci/hisilicon-pcie.txt b/Documentation/devicetree/bindings/pci/hisilicon-pcie.txt
new file mode 100644
index 0000000..17c6ed9
--- /dev/null
+++ b/Documentation/devicetree/bindings/pci/hisilicon-pcie.txt
@@ -0,0 +1,44 @@
+HiSilicon PCIe host bridge DT description
+
+HiSilicon PCIe host controller is based on Designware PCI core.
+It shares common functions with PCIe Designware core driver and inherits
+common properties defined in
+Documentation/devicetree/bindings/pci/designware-pci.txt.
+
+Additional properties are described here:
+
+Required properties:
+- compatible: Should contain "hisilicon,hip05-pcie".
+- reg: Should contain rc_dbi, config registers location and length.
+- reg-names: Must include the following entries:
+ "rc_dbi": controller configuration registers;
+ "config": PCIe configuration space registers.
+- msi-parent: Should be its_pcie which is an ITS receiving MSI interrupts.
+- port-id: Should be 0, 1, 2 or 3.
+
+Optional properties:
+- status: Either "ok" or "disabled".
+- dma-coherent: Present if DMA operations are coherent.
+
+Example:
+ pcie@0xb0080000 {
+ compatible = "hisilicon,hip05-pcie", "snps,dw-pcie";
+ reg = <0 0xb0080000 0 0x10000>, <0x220 0x00000000 0 0x2000>;
+ reg-names = "rc_dbi", "config";
+ bus-range = <0 15>;
+ msi-parent = <&its_pcie>;
+ #address-cells = <3>;
+ #size-cells = <2>;
+ device_type = "pci";
+ dma-coherent;
+ ranges = <0x82000000 0 0x00000000 0x220 0x00000000 0 0x10000000>;
+ num-lanes = <8>;
+ port-id = <1>;
+ #interrupts-cells = <1>;
+ interrupts-map-mask = <0xf800 0 0 7>;
+ interrupts-map = <0x0 0 0 1 &mbigen_pcie 1 10
+ 0x0 0 0 2 &mbigen_pcie 2 11
+ 0x0 0 0 3 &mbigen_pcie 3 12
+ 0x0 0 0 4 &mbigen_pcie 4 13>;
+ status = "ok";
+ };
diff --git a/MAINTAINERS b/MAINTAINERS
index 7ba7ab7..944a229 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -8047,6 +8047,13 @@ S: Maintained
F: Documentation/devicetree/bindings/pci/xgene-pci-msi.txt
F: drivers/pci/host/pci-xgene-msi.c

+PCIE DRIVER FOR HISILICON
+M: Zhou Wang <wangzhou1@xxxxxxxxxxxxx>
+L: linux-pci@xxxxxxxxxxxxxxx
+S: Maintained
+F: Documentation/devicetree/bindings/pci/hisilicon-pcie.txt
+F: drivers/pci/host/pcie-hisi.c
+
PCMCIA SUBSYSTEM
P: Linux PCMCIA Team
L: linux-pcmcia@xxxxxxxxxxxxxxxxxxx
diff --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig
index d5e58ba..ae873be 100644
--- a/drivers/pci/host/Kconfig
+++ b/drivers/pci/host/Kconfig
@@ -145,4 +145,12 @@ config PCIE_IPROC_BCMA
Say Y here if you want to use the Broadcom iProc PCIe controller
through the BCMA bus interface

+config PCI_HISI
+ depends on OF && ARM64
+ bool "HiSilicon SoC HIP05 PCIe controller"
+ select PCIEPORTBUS
+ select PCIE_DW
+ help
+ Say Y here if you want PCIe controller support on HiSilicon HIP05 SoC
+
endmenu
diff --git a/drivers/pci/host/Makefile b/drivers/pci/host/Makefile
index 140d66f..ea1dbf2 100644
--- a/drivers/pci/host/Makefile
+++ b/drivers/pci/host/Makefile
@@ -17,3 +17,4 @@ obj-$(CONFIG_PCI_VERSATILE) += pci-versatile.o
obj-$(CONFIG_PCIE_IPROC) += pcie-iproc.o
obj-$(CONFIG_PCIE_IPROC_PLATFORM) += pcie-iproc-platform.o
obj-$(CONFIG_PCIE_IPROC_BCMA) += pcie-iproc-bcma.o
+obj-$(CONFIG_PCI_HISI) += pcie-hisi.o
diff --git a/drivers/pci/host/pcie-hisi.c b/drivers/pci/host/pcie-hisi.c
new file mode 100644
index 0000000..545d4e7
--- /dev/null
+++ b/drivers/pci/host/pcie-hisi.c
@@ -0,0 +1,198 @@
+/*
+ * PCIe host controller driver for HiSilicon Hip05 SoC
+ *
+ * Copyright (C) 2015 HiSilicon Co., Ltd. http://www.hisilicon.com
+ *
+ * Author: Zhou Wang <wangzhou1@xxxxxxxxxxxxx>
+ * Dacai Zhu <zhudacai@xxxxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/mfd/syscon.h>
+#include <linux/of_address.h>
+#include <linux/of_pci.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#include "pcie-designware.h"
+
+#define PCIE_SUBCTRL_SYS_STATE4_REG 0x6818
+#define PCIE_LTSSM_LINKUP_STATE 0x11
+#define PCIE_LTSSM_STATE_MASK 0x3F
+
+#define to_hisi_pcie(x) container_of(x, struct hisi_pcie, pp)
+
+struct hisi_pcie {
+ struct regmap *subctrl;
+ void __iomem *reg_base;
+ u32 port_id;
+ struct pcie_port pp;
+};
+
+static inline void hisi_pcie_apb_writel(struct hisi_pcie *pcie,
+ u32 val, u32 reg)
+{
+ writel(val, pcie->reg_base + reg);
+}
+
+static inline u32 hisi_pcie_apb_readl(struct hisi_pcie *pcie, u32 reg)
+{
+ return readl(pcie->reg_base + reg);
+}
+
+/* Hip05 PCIe host only supports 32-bit config access */
+static int hisi_pcie_cfg_read(struct pcie_port *pp, int where, int size,
+ u32 *val)
+{
+ u32 reg;
+ u32 reg_val;
+ struct hisi_pcie *pcie = to_hisi_pcie(pp);
+ void *walker = &reg_val;
+
+ walker += (where & 0x3);
+ reg = where & ~0x3;
+ reg_val = hisi_pcie_apb_readl(pcie, reg);
+
+ if (size == 1)
+ *val = *(u8 __force *) walker;
+ else if (size == 2)
+ *val = *(u16 __force *) walker;
+ else if (size != 4)
+ return PCIBIOS_BAD_REGISTER_NUMBER;
+
+ return PCIBIOS_SUCCESSFUL;
+}
+
+/* Hip05 PCIe host only supports 32-bit config access */
+static int hisi_pcie_cfg_write(struct pcie_port *pp, int where, int size,
+ u32 val)
+{
+ u32 reg_val;
+ u32 reg;
+ struct hisi_pcie *pcie = to_hisi_pcie(pp);
+ void *walker = &reg_val;
+
+ walker += (where & 0x3);
+ reg = where & ~0x3;
+ if (size == 4)
+ hisi_pcie_apb_writel(pcie, val, reg);
+ else if (size == 2) {
+ reg_val = hisi_pcie_apb_readl(pcie, reg);
+ *(u16 __force *) walker = val;
+ hisi_pcie_apb_writel(pcie, reg_val, reg);
+ } else if (size == 1) {
+ reg_val = hisi_pcie_apb_readl(pcie, reg);
+ *(u8 __force *) walker = val;
+ hisi_pcie_apb_writel(pcie, reg_val, reg);
+ } else
+ return PCIBIOS_BAD_REGISTER_NUMBER;
+
+ return PCIBIOS_SUCCESSFUL;
+}
+
+static int hisi_pcie_link_up(struct pcie_port *pp)
+{
+ u32 val;
+ struct hisi_pcie *hisi_pcie = to_hisi_pcie(pp);
+
+ regmap_read(hisi_pcie->subctrl, PCIE_SUBCTRL_SYS_STATE4_REG +
+ 0x100 * hisi_pcie->port_id, &val);
+
+ return ((val & PCIE_LTSSM_STATE_MASK) == PCIE_LTSSM_LINKUP_STATE);
+}
+
+static struct pcie_host_ops hisi_pcie_host_ops = {
+ .rd_own_conf = hisi_pcie_cfg_read,
+ .wr_own_conf = hisi_pcie_cfg_write,
+ .link_up = hisi_pcie_link_up,
+};
+
+static int __init hisi_add_pcie_port(struct pcie_port *pp,
+ struct platform_device *pdev)
+{
+ int ret;
+ u32 port_id;
+ struct hisi_pcie *hisi_pcie = to_hisi_pcie(pp);
+
+ if (of_property_read_u32(pdev->dev.of_node, "port-id", &port_id)) {
+ dev_err(&pdev->dev, "failed to read port-id\n");
+ return -EINVAL;
+ }
+ if (port_id > 3) {
+ dev_err(&pdev->dev, "Invalid port-id: %d\n", port_id);
+ return -EINVAL;
+ }
+ hisi_pcie->port_id = port_id;
+
+ pp->ops = &hisi_pcie_host_ops;
+
+ ret = dw_pcie_host_init(pp);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to initialize host\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+static int __init hisi_pcie_probe(struct platform_device *pdev)
+{
+ struct hisi_pcie *hisi_pcie;
+ struct pcie_port *pp;
+ struct resource *reg;
+ int ret;
+
+ hisi_pcie = devm_kzalloc(&pdev->dev, sizeof(*hisi_pcie), GFP_KERNEL);
+ if (!hisi_pcie)
+ return -ENOMEM;
+
+ pp = &hisi_pcie->pp;
+ pp->dev = &pdev->dev;
+
+ hisi_pcie->subctrl =
+ syscon_regmap_lookup_by_compatible("hisilicon,pcie-sas-subctrl");
+ if (IS_ERR(hisi_pcie->subctrl)) {
+ dev_err(pp->dev, "cannot get subctrl base\n");
+ return PTR_ERR(hisi_pcie->subctrl);
+ }
+
+ reg = platform_get_resource_byname(pdev, IORESOURCE_MEM, "rc_dbi");
+ hisi_pcie->reg_base = devm_ioremap_resource(&pdev->dev, reg);
+ if (IS_ERR(hisi_pcie->reg_base)) {
+ dev_err(pp->dev, "cannot get rc_dbi base\n");
+ return PTR_ERR(hisi_pcie->reg_base);
+ }
+
+ hisi_pcie->pp.dbi_base = hisi_pcie->reg_base;
+
+ ret = hisi_add_pcie_port(pp, pdev);
+ if (ret)
+ return ret;
+
+ platform_set_drvdata(pdev, hisi_pcie);
+
+ dev_warn(pp->dev, "Hip05 PCIe host only supports 32-bit config access of host\n");
+
+ return 0;
+}
+
+static const struct of_device_id hisi_pcie_of_match[] = {
+ {.compatible = "hisilicon,hip05-pcie",},
+ {},
+};
+
+MODULE_DEVICE_TABLE(of, hisi_pcie_of_match);
+
+static struct platform_driver hisi_pcie_driver = {
+ .probe = hisi_pcie_probe,
+ .driver = {
+ .name = "hisi-pcie",
+ .of_match_table = hisi_pcie_of_match,
+ },
+};
+
+module_platform_driver(hisi_pcie_driver);
--
1.9.1

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