[PATCH V3 2/2] PCI/ACPI: hisi: Add ACPI support for HiSilicon SoCs Host Controllers

From: Dongdong Liu
Date: Wed Oct 19 2016 - 22:54:19 EST

PCIe controller in Hip05/HIP06/HIP07 SoCs is not ECAM compliant.
It is non ECAM only for the RC bus config space;for any other bus
underneath the root bus we support ECAM access.
Add specific quirks for PCI config space accessors.This involves:
1. New initialization call hisi_pcie_init() to obtain rc base
addresses from PNP0C02 as subdevice of PNP0A03.
2. New entry in common quirk array.

Signed-off-by: Dongdong Liu <liudongdong3@xxxxxxxxxx>
Signed-off-by: Gabriele Paoloni <gabriele.paoloni@xxxxxxxxxx>
---
MAINTAINERS | 1 +
drivers/acpi/pci_mcfg.c | 15 ++++
drivers/pci/host/Kconfig | 8 ++
drivers/pci/host/Makefile | 1 +
drivers/pci/host/pcie-hisi-acpi.c | 170 ++++++++++++++++++++++++++++++++++++++
include/linux/pci-ecam.h | 4 +
6 files changed, 199 insertions(+)
create mode 100755 drivers/pci/host/pcie-hisi-acpi.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 1cd38a7..b224caa 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -9358,6 +9358,7 @@ L: linux-pci@xxxxxxxxxxxxxxx
S: Maintained
F: Documentation/devicetree/bindings/pci/hisilicon-pcie.txt
F: drivers/pci/host/pcie-hisi.c
+F: drivers/pci/host/pcie-hisi-acpi.c

PCIE DRIVER FOR ROCKCHIP
M: Shawn Lin <shawn.lin@xxxxxxxxxxxxxx>
diff --git a/drivers/acpi/pci_mcfg.c b/drivers/acpi/pci_mcfg.c
index bb2c508..135a9b4 100644
--- a/drivers/acpi/pci_mcfg.c
+++ b/drivers/acpi/pci_mcfg.c
@@ -96,6 +96,21 @@ struct mcfg_fixup {
THUNDER_ECAM_MCFG(2, 12),
THUNDER_ECAM_MCFG(2, 13),
#endif
+#define PCI_ACPI_QUIRK_QUAD_DOM(table_id, seg, ops) \
+ { "HISI ", table_id, 0, seg + 0, MCFG_BUS_ANY, ops }, \
+ { "HISI ", table_id, 0, seg + 1, MCFG_BUS_ANY, ops }, \
+ { "HISI ", table_id, 0, seg + 2, MCFG_BUS_ANY, ops }, \
+ { "HISI ", table_id, 0, seg + 3, MCFG_BUS_ANY, ops }
+
+#ifdef CONFIG_PCI_HISI_ACPI
+ PCI_ACPI_QUIRK_QUAD_DOM("HIP05 ", 0, &hisi_pcie_ops),
+ PCI_ACPI_QUIRK_QUAD_DOM("HIP06 ", 0, &hisi_pcie_ops),
+ PCI_ACPI_QUIRK_QUAD_DOM("HIP07 ", 0, &hisi_pcie_ops),
+ PCI_ACPI_QUIRK_QUAD_DOM("HIP07 ", 4, &hisi_pcie_ops),
+ PCI_ACPI_QUIRK_QUAD_DOM("HIP07 ", 8, &hisi_pcie_ops),
+ PCI_ACPI_QUIRK_QUAD_DOM("HIP07 ", 12, &hisi_pcie_ops),
+#endif
+
};

static char mcfg_oem_id[ACPI_OEM_ID_SIZE];
diff --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig
index ae98644..9ff2bcd 100644
--- a/drivers/pci/host/Kconfig
+++ b/drivers/pci/host/Kconfig
@@ -227,6 +227,14 @@ config PCI_HISI
Say Y here if you want PCIe controller support on HiSilicon
Hip05 and Hip06 and Hip07 SoCs

+config PCI_HISI_ACPI
+ depends on ACPI && ARM64
+ bool "HiSilicon Hip05 and Hip06 and Hip07 SoCs ACPI PCIe controllers"
+ select PNP
+ help
+ Say Y here if you want ACPI PCIe controller support on HiSilicon
+ Hip05 and Hip06 and Hip07 SoCs
+
config PCIE_QCOM
bool "Qualcomm PCIe controller"
depends on ARCH_QCOM && OF
diff --git a/drivers/pci/host/Makefile b/drivers/pci/host/Makefile
index 084cb49..9402858 100644
--- a/drivers/pci/host/Makefile
+++ b/drivers/pci/host/Makefile
@@ -26,6 +26,7 @@ obj-$(CONFIG_PCIE_IPROC_BCMA) += pcie-iproc-bcma.o
obj-$(CONFIG_PCIE_ALTERA) += pcie-altera.o
obj-$(CONFIG_PCIE_ALTERA_MSI) += pcie-altera-msi.o
obj-$(CONFIG_PCI_HISI) += pcie-hisi.o
+obj-$(CONFIG_PCI_HISI_ACPI) += pcie-hisi-acpi.o
obj-$(CONFIG_PCIE_QCOM) += pcie-qcom.o
obj-$(CONFIG_PCI_HOST_THUNDER_ECAM) += pci-thunder-ecam.o
obj-$(CONFIG_PCI_HOST_THUNDER_PEM) += pci-thunder-pem.o
diff --git a/drivers/pci/host/pcie-hisi-acpi.c b/drivers/pci/host/pcie-hisi-acpi.c
new file mode 100755
index 0000000..5650d91
--- /dev/null
+++ b/drivers/pci/host/pcie-hisi-acpi.c
@@ -0,0 +1,170 @@
+/*
+ * PCIe host controller driver for HiSilicon HipXX SoCs
+ *
+ * Copyright (C) 2016 HiSilicon Co., Ltd. http://www.hisilicon.com
+ *
+ * Author: Dongdong Liu <liudongdong3@xxxxxxxxxx>
+ * Gabriele Paoloni <gabriele.paoloni@xxxxxxxxxx>
+ *
+ * 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/pci.h>
+#include <linux/pci-acpi.h>
+#include <linux/pci-ecam.h>
+
+#define DEBUG0 0x728
+#define PCIE_LTSSM_LINKUP_STATE 0x11
+#define PCIE_LTSSM_STATE_MASK 0x3F
+
+static const struct acpi_device_id hisi_pcie_rc_res_ids[] = {
+ {"HISI0081", 0},
+ {"", 0},
+};
+
+static int hisi_pcie_link_up_acpi(struct pci_config_window *cfg)
+{
+ u32 val;
+ void __iomem *reg_base = cfg->priv;
+
+ val = readl(reg_base + DEBUG0);
+ return ((val & PCIE_LTSSM_STATE_MASK) == PCIE_LTSSM_LINKUP_STATE);
+}
+
+static int hisi_pcie_acpi_rd_conf(struct pci_bus *bus, u32 devfn, int where,
+ int size, u32 *val)
+{
+ struct pci_config_window *cfg = bus->sysdata;
+ int dev = PCI_SLOT(devfn);
+
+ if (bus->number == cfg->busr.start) {
+ /* access only one slot on each root port */
+ if (dev > 0)
+ return PCIBIOS_DEVICE_NOT_FOUND;
+ else
+ return pci_generic_config_read32(bus, devfn, where,
+ size, val);
+ }
+
+ return pci_generic_config_read(bus, devfn, where, size, val);
+}
+
+static int hisi_pcie_acpi_wr_conf(struct pci_bus *bus, u32 devfn,
+ int where, int size, u32 val)
+{
+ struct pci_config_window *cfg = bus->sysdata;
+ int dev = PCI_SLOT(devfn);
+
+ if (bus->number == cfg->busr.start) {
+ /* access only one slot on each root port */
+ if (dev > 0)
+ return PCIBIOS_DEVICE_NOT_FOUND;
+ else
+ return pci_generic_config_write32(bus, devfn, where,
+ size, val);
+ }
+
+ return pci_generic_config_write(bus, devfn, where, size, val);
+}
+
+static void __iomem *hisi_pcie_map_bus(struct pci_bus *bus, unsigned int devfn,
+ int where)
+{
+ struct pci_config_window *cfg = bus->sysdata;
+ void __iomem *reg_base = cfg->priv;
+
+ if (bus->number == cfg->busr.start)
+ return reg_base + where;
+ else
+ return pci_ecam_map_bus(bus, devfn, where);
+}
+
+/*
+ * Retrieve RC base and size from sub-device under the RC
+ * Device (RES1)
+ * {
+ * Name (_HID, "HISI0081")
+ * Name (_CID, "PNP0C02")
+ * Name (_CRS, ResourceTemplate (){
+ * Memory32Fixed (ReadWrite, 0xb0080000, 0x10000)
+ * })
+ * }
+ */
+static int hisi_pcie_rc_addr_get(struct acpi_device *adev,
+ void __iomem **addr)
+{
+ struct acpi_device *child_adev;
+ struct list_head list;
+ struct resource *res;
+ struct resource_entry *entry;
+ unsigned long flags;
+ int ret;
+
+ list_for_each_entry(child_adev, &adev->children, node) {
+ ret = acpi_match_device_ids(child_adev, hisi_pcie_rc_res_ids);
+ if (ret)
+ continue;
+
+ INIT_LIST_HEAD(&list);
+ flags = IORESOURCE_MEM;
+ ret = acpi_dev_get_resources(child_adev, &list,
+ acpi_dev_filter_resource_type_cb,
+ (void *)flags);
+ if (ret < 0) {
+ dev_err(&child_adev->dev,
+ "failed to parse _CRS method, error code %d\n",
+ ret);
+ return ret;
+ } else if (ret == 0) {
+ dev_err(&child_adev->dev,
+ "no IO and memory resources present in _CRS\n");
+ return -EINVAL;
+ }
+
+ entry = list_first_entry(&list, struct resource_entry, node);
+ res = entry->res;
+ *addr = devm_ioremap(&child_adev->dev,
+ res->start, resource_size(res));
+ acpi_dev_free_resource_list(&list);
+ if (IS_ERR(*addr)) {
+ dev_err(&child_adev->dev, "error with ioremap\n");
+ return -ENOMEM;
+ }
+
+ return 0;
+ }
+
+ return -EINVAL;
+}
+
+static int hisi_pcie_init(struct pci_config_window *cfg)
+{
+ int ret;
+ struct acpi_device *adev = to_acpi_device(cfg->parent);
+ void __iomem *reg_base;
+
+ ret = hisi_pcie_rc_addr_get(adev, &reg_base);
+ if (ret) {
+ dev_err(&adev->dev, "can't get rc base address");
+ return ret;
+ }
+
+ cfg->priv = reg_base;
+ if (!hisi_pcie_link_up_acpi(cfg)) {
+ dev_err(&adev->dev, "link status is down\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+struct pci_ecam_ops hisi_pcie_ops = {
+ .bus_shift = 20,
+ .init = hisi_pcie_init,
+ .pci_ops = {
+ .map_bus = hisi_pcie_map_bus,
+ .read = hisi_pcie_acpi_rd_conf,
+ .write = hisi_pcie_acpi_wr_conf,
+ }
+};
diff --git a/include/linux/pci-ecam.h b/include/linux/pci-ecam.h
index 35f0e81..2db4db8 100644
--- a/include/linux/pci-ecam.h
+++ b/include/linux/pci-ecam.h
@@ -66,6 +66,10 @@ void __iomem *pci_ecam_map_bus(struct pci_bus *bus, unsigned int devfn,
extern struct pci_ecam_ops pci_thunder_ecam_ops;
#endif

+#ifdef CONFIG_PCI_HISI_ACPI
+extern struct pci_ecam_ops hisi_pcie_ops;
+#endif
+
#ifdef CONFIG_PCI_HOST_GENERIC
/* for DT-based PCI controllers that support ECAM */
int pci_host_common_probe(struct platform_device *pdev,
--
1.9.1