Re: [PATCH V3 2/2] PCI/ACPI: hisi: Add ACPI support for HiSilicon SoCs Host Controllers
From: Dongdong Liu
Date: Fri Oct 21 2016 - 02:17:02 EST
Hi Rafael
Thanks for your review.
å 2016/10/20 20:27, Rafael J. Wysocki åé:
On Thu, Oct 20, 2016 at 5:10 AM, Dongdong Liu <liudongdong3@xxxxxxxxxx> wrote:
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);
Why is this expected to be struct acpi_device?
I use this acpi device(Device (PCI2)) to get it's child acpi device(Device (RES2)), then
obtain rc base addresses from PNP0C02 as subdevice of PNP0A03.
The procedure to get the value of cfg->parent is as the below.
arch/arm64/kernel/pci.c
pci_acpi_scan_root(struct acpi_pci_root *root)
--->pci_acpi_setup_ecam_mapping(root, ri);
--->pci_ecam_create(&root->device->dev, &cfgres, bus_res, ecam_ops);
--->cfg->parent = dev
;
PCIe DSDT table defines as below.
Device (PCI2)
{
Name (_HID, "PNP0A08") // PCI Express Root Bridge
Name (_CID, "PNP0A03") // Compatible PCI Root Bridge
......
Device (RES2)
{
Name (_HID, "HISI0081") // HiSi PCIe RC config base address
Name (_CID, "PNP0C02") // Motherboard reserved resource
Name (_CRS, ResourceTemplate (){
Memory32Fixed (ReadWrite, 0xa00a0000 , 0x10000)
})
......
}
Shouldn't it be a "physical" device whose companion is an ACPI device object?
Sorry, I don't understand. What do you mean ?
It should be a "physical" device. but I have not saw about ACPI_COMPANION_SET() of this device.
Thanks
Dongdong
Thanks,
Rafael
.