[PATCH V6 2/2] PCI/ACPI: hisi: Add ACPI support for HiSilicon SoCs Host Controllers
From: Dongdong Liu
Date: Tue Nov 22 2016 - 06:52:30 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 at the root of the ACPI namespace (under \_SB).
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 | 13 +++++
drivers/pci/host/Kconfig | 7 +++
drivers/pci/host/Makefile | 1 +
drivers/pci/host/pcie-hisi-acpi.c | 119 ++++++++++++++++++++++++++++++++++++++
include/linux/pci-ecam.h | 5 ++
6 files changed, 146 insertions(+)
create mode 100644 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 ac21db3..3297c5a 100644
--- a/drivers/acpi/pci_mcfg.c
+++ b/drivers/acpi/pci_mcfg.c
@@ -57,6 +57,19 @@ struct mcfg_fixup {
{ "QCOM ", "QDF2432 ", 1, 5, MCFG_BUS_ANY, &pci_32b_ops },
{ "QCOM ", "QDF2432 ", 1, 6, MCFG_BUS_ANY, &pci_32b_ops },
{ "QCOM ", "QDF2432 ", 1, 7, MCFG_BUS_ANY, &pci_32b_ops },
+#ifdef CONFIG_PCI_ECAM_QUIRKS
+ #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 }
+ 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..1fbade5 100644
--- a/drivers/pci/host/Kconfig
+++ b/drivers/pci/host/Kconfig
@@ -301,4 +301,11 @@ config VMD
To compile this driver as a module, choose M here: the
module will be called vmd.
+config PCI_ECAM_QUIRKS
+ bool "PCI ECAM quirks for ARM64 platform"
+ depends on PCI_ECAM && ARM64 && ACPI
+ help
+ Say y here to enable your platform-specific config access that
+ is not ECAM compliant.
+
endmenu
diff --git a/drivers/pci/host/Makefile b/drivers/pci/host/Makefile
index 084cb49..15435b4 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-$(CONFIG_PCI_ECAM_QUIRKS) += pcie-hisi-acpi.o
obj-$(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 100644
index 0000000..8bb43b4
--- /dev/null
+++ b/drivers/pci/host/pcie-hisi-acpi.c
@@ -0,0 +1,119 @@
+/*
+ * 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>
+#include "../pci.h"
+
+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 PNP0C02 at the root of the ACPI namespace
+ * (under \_SB).
+ * Scope(_SB)
+ * {
+ * Device (PCI0)
+ * {
+ * Name(_HID, "PNP0A08")
+ * Name(_CID, "PNP0A03")
+ * Name(_SEG, 0)
+ * ......
+ * }
+ * Device (RES0)
+ * {
+ * Name(_HID, "HISI0081")
+ * Name(_CID, "PNP0C02")
+ * Name(_UID, 0x0)
+ * Name(_CRS, ResourceTemplate (){
+ * Memory32Fixed (ReadWrite, 0xa0090000, 0x10000)
+ * })
+ * }
+ * ......
+ * }
+ */
+static int hisi_pcie_init(struct pci_config_window *cfg)
+{
+ struct acpi_device *adev = to_acpi_device(cfg->parent);
+ struct acpi_pci_root *root = acpi_driver_data(adev);
+ void __iomem *reg_base;
+ struct resource *res;
+
+ res = acpi_get_rc_resources("HISI0081", root->segment);
+ if (!res) {
+ dev_err(&adev->dev, "can't get rc base address");
+ return -ENOMEM;
+ }
+
+ reg_base = devm_ioremap(&adev->dev, res->start, resource_size(res));
+ if (!reg_base)
+ return -ENOMEM;
+
+ cfg->priv = reg_base;
+ 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 f5740b7..40fab66 100644
--- a/include/linux/pci-ecam.h
+++ b/include/linux/pci-ecam.h
@@ -67,4 +67,9 @@ void __iomem *pci_ecam_map_bus(struct pci_bus *bus, unsigned int devfn,
int pci_host_common_probe(struct platform_device *pdev,
struct pci_ecam_ops *ops);
#endif
+
+#ifdef CONFIG_PCI_ECAM_QUIRKS
+extern struct pci_ecam_ops hisi_pcie_ops;
+#endif
+
#endif
--
1.9.1