[RFC PATCH V5 5/5] PCI: thunder-pem: Support quirky configuration space access for ACPI based PCI host controller
Tomasz Nowicki
tn at semihalf.com
Mon Aug 8 05:56:42 PDT 2016
Add infrastructure to support ThunderX PEM specific PCI configuration space
access for ACPI based PCI host controller. This involves:
1. New initialization call thunder_pem_cfg_init() to create configuration
space mapping based on hardcoded range addresses
2. thunder_pem_init() ACPI extension to obtain hardcoded addresses for
PEM specific register ranges
3. New quirk entry (for common quirk array) which identifies platform and
calls thunder_pem_cfg_init() from [1]
Signed-off-by: Tomasz Nowicki <tn at semihalf.com>
---
drivers/pci/host/mcfg-quirks.c | 7 +++
drivers/pci/host/mcfg-quirks.h | 4 ++
drivers/pci/host/pci-thunder-pem.c | 96 ++++++++++++++++++++++++++++++++------
3 files changed, 94 insertions(+), 13 deletions(-)
diff --git a/drivers/pci/host/mcfg-quirks.c b/drivers/pci/host/mcfg-quirks.c
index aa9907b..2993a72 100644
--- a/drivers/pci/host/mcfg-quirks.c
+++ b/drivers/pci/host/mcfg-quirks.c
@@ -44,6 +44,13 @@ struct pci_cfg_fixup {
static struct pci_cfg_fixup mcfg_quirks[] __initconst = {
/* { OEM_ID, OEM_TABLE_ID, REV, DOMAIN, BUS_RANGE, pci_ops, init_hook }, */
+#ifdef CONFIG_PCI_HOST_THUNDER_PEM
+ /* Pass2.0 */
+ { "CAVIUM", "THUNDERX", 1, MCFG_DOM_RANGE(4, 9), MCFG_BUS_ANY, NULL,
+ thunder_pem_cfg_init },
+ { "CAVIUM", "THUNDERX", 1, MCFG_DOM_RANGE(14, 19), MCFG_BUS_ANY, NULL,
+ thunder_pem_cfg_init },
+#endif
};
static bool pci_mcfg_fixup_match(struct pci_cfg_fixup *f,
diff --git a/drivers/pci/host/mcfg-quirks.h b/drivers/pci/host/mcfg-quirks.h
index 45cbd16..411c667 100644
--- a/drivers/pci/host/mcfg-quirks.h
+++ b/drivers/pci/host/mcfg-quirks.h
@@ -16,5 +16,9 @@
#define __MCFG_QUIRKS_H__
/* MCFG quirks initialize call list */
+#ifdef CONFIG_PCI_HOST_THUNDER_PEM
+struct pci_config_window *
+thunder_pem_cfg_init(struct acpi_pci_root *root, struct pci_ops *ops);
+#endif
#endif /* __MCFG_QUIRKS_H__ */
diff --git a/drivers/pci/host/pci-thunder-pem.c b/drivers/pci/host/pci-thunder-pem.c
index 6abaf80..3f06e49 100644
--- a/drivers/pci/host/pci-thunder-pem.c
+++ b/drivers/pci/host/pci-thunder-pem.c
@@ -18,9 +18,12 @@
#include <linux/init.h>
#include <linux/of_address.h>
#include <linux/of_pci.h>
+#include <linux/pci-acpi.h>
#include <linux/pci-ecam.h>
#include <linux/platform_device.h>
+#include "mcfg-quirks.h"
+
#define PEM_CFG_WR 0x28
#define PEM_CFG_RD 0x30
@@ -284,6 +287,37 @@ static int thunder_pem_config_write(struct pci_bus *bus, unsigned int devfn,
return pci_generic_config_write(bus, devfn, where, size, val);
}
+#ifdef CONFIG_ACPI
+
+static struct resource thunder_pem_reg_res[] = {
+ [4] = DEFINE_RES_MEM(0x87e0c0000000UL, SZ_16M),
+ [5] = DEFINE_RES_MEM(0x87e0c1000000UL, SZ_16M),
+ [6] = DEFINE_RES_MEM(0x87e0c2000000UL, SZ_16M),
+ [7] = DEFINE_RES_MEM(0x87e0c3000000UL, SZ_16M),
+ [8] = DEFINE_RES_MEM(0x87e0c4000000UL, SZ_16M),
+ [9] = DEFINE_RES_MEM(0x87e0c5000000UL, SZ_16M),
+ [14] = DEFINE_RES_MEM(0x97e0c0000000UL, SZ_16M),
+ [15] = DEFINE_RES_MEM(0x97e0c1000000UL, SZ_16M),
+ [16] = DEFINE_RES_MEM(0x97e0c2000000UL, SZ_16M),
+ [17] = DEFINE_RES_MEM(0x97e0c3000000UL, SZ_16M),
+ [18] = DEFINE_RES_MEM(0x97e0c4000000UL, SZ_16M),
+ [19] = DEFINE_RES_MEM(0x97e0c5000000UL, SZ_16M),
+};
+
+static struct resource *thunder_pem_acpi_res(struct pci_config_window *cfg)
+{
+ struct acpi_device *adev = to_acpi_device(cfg->parent);
+ struct acpi_pci_root *root = acpi_driver_data(adev);
+
+ return &thunder_pem_reg_res[root->segment];
+}
+#else
+static struct resource *thunder_pem_acpi_res(struct pci_config_window *cfg)
+{
+ return NULL;
+}
+#endif
+
static int thunder_pem_init(struct pci_config_window *cfg)
{
struct device *dev = cfg->parent;
@@ -292,24 +326,24 @@ static int thunder_pem_init(struct pci_config_window *cfg)
struct thunder_pem_pci *pem_pci;
struct platform_device *pdev;
- /* Only OF support for now */
- if (!dev->of_node)
- return -EINVAL;
-
pem_pci = devm_kzalloc(dev, sizeof(*pem_pci), GFP_KERNEL);
if (!pem_pci)
return -ENOMEM;
- pdev = to_platform_device(dev);
-
- /*
- * The second register range is the PEM bridge to the PCIe
- * bus. It has a different config access method than those
- * devices behind the bridge.
- */
- res_pem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ if (acpi_disabled) {
+ pdev = to_platform_device(dev);
+
+ /*
+ * The second register range is the PEM bridge to the PCIe
+ * bus. It has a different config access method than those
+ * devices behind the bridge.
+ */
+ res_pem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ } else {
+ res_pem = thunder_pem_acpi_res(cfg);
+ }
if (!res_pem) {
- dev_err(dev, "missing \"reg[1]\"property\n");
+ dev_err(dev, "missing configuration region\n");
return -EINVAL;
}
@@ -360,3 +394,39 @@ static struct platform_driver thunder_pem_driver = {
.probe = thunder_pem_probe,
};
builtin_platform_driver(thunder_pem_driver);
+
+#ifdef CONFIG_ACPI
+
+static struct resource thunder_pem_cfg_res[] = {
+ [4] = DEFINE_RES_MEM(0x88001f000000UL, 0x39 * SZ_16M),
+ [5] = DEFINE_RES_MEM(0x884057000000UL, 0x39 * SZ_16M),
+ [6] = DEFINE_RES_MEM(0x88808f000000UL, 0x39 * SZ_16M),
+ [7] = DEFINE_RES_MEM(0x89001f000000UL, 0x39 * SZ_16M),
+ [8] = DEFINE_RES_MEM(0x894057000000UL, 0x39 * SZ_16M),
+ [9] = DEFINE_RES_MEM(0x89808f000000UL, 0x39 * SZ_16M),
+ [14] = DEFINE_RES_MEM(0x98001f000000UL, 0x39 * SZ_16M),
+ [15] = DEFINE_RES_MEM(0x984057000000UL, 0x39 * SZ_16M),
+ [16] = DEFINE_RES_MEM(0x98808f000000UL, 0x39 * SZ_16M),
+ [17] = DEFINE_RES_MEM(0x99001f000000UL, 0x39 * SZ_16M),
+ [18] = DEFINE_RES_MEM(0x994057000000UL, 0x39 * SZ_16M),
+ [19] = DEFINE_RES_MEM(0x99808f000000UL, 0x39 * SZ_16M),
+};
+
+struct pci_config_window *
+thunder_pem_cfg_init(struct acpi_pci_root *root, struct pci_ops *ops)
+{
+ struct resource *bus_res = &root->secondary;
+ u16 seg = root->segment;
+ struct pci_config_window *cfg;
+
+ cfg = pci_ecam_create(&root->device->dev, &thunder_pem_cfg_res[seg],
+ bus_res, &pci_thunder_pem_ops);
+ if (IS_ERR(cfg)) {
+ dev_err(&root->device->dev, "%04x:%pR error %ld mapping ECAM\n",
+ seg, bus_res, PTR_ERR(cfg));
+ return NULL;
+ }
+
+ return cfg;
+}
+#endif
--
1.9.1
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