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authorBjorn Helgaas <bhelgaas@google.com>2022-08-04 19:41:56 +0300
committerBjorn Helgaas <bhelgaas@google.com>2022-08-04 19:41:56 +0300
commitb4773c53c54a3511aba30028d6df95c2e8433f09 (patch)
treec5c33bd99cf0e0b69af72538984e87f755c6c851 /drivers/pci
parent13506868d9f4011383fd652eb07fcc80bba1a456 (diff)
parent930c6074d7dd579f3d4e8b04548dd8cb0341de1d (diff)
downloadlinux-b4773c53c54a3511aba30028d6df95c2e8433f09.tar.xz
Merge branch 'pci/ctrl/loongson'
- Wrap ARM64-specific MCFG quirks in #ifdef so Loongson can use the file (Huacai Chen) - Use generic (not 32-bit only) config accesses for LS2K/LS7A (Huacai Chen) - Add ACPI and MCFG support for Loongson LS7A (Huacai Chen) - Avoid config reads to non-existent LS2K/LS7A devices because a hardware defect causes machine hangs (Huacai Chen) - Work around LS7A integrated devices that report incorrect Interrupt Pin values (Jianmin Lv) * pci/ctrl/loongson: PCI: loongson: Work around LS7A incorrect Interrupt Pin registers PCI: loongson: Don't access non-existent devices PCI: loongson: Add ACPI init support PCI: loongson: Use generic 8/16/32-bit config ops on LS2K/LS7A PCI/ACPI: Guard ARM64-specific mcfg_quirks
Diffstat (limited to 'drivers/pci')
-rw-r--r--drivers/pci/controller/Kconfig2
-rw-r--r--drivers/pci/controller/pci-loongson.c206
2 files changed, 167 insertions, 41 deletions
diff --git a/drivers/pci/controller/Kconfig b/drivers/pci/controller/Kconfig
index b8d96d38064d..9dbd73898b47 100644
--- a/drivers/pci/controller/Kconfig
+++ b/drivers/pci/controller/Kconfig
@@ -293,7 +293,7 @@ config PCI_HYPERV_INTERFACE
config PCI_LOONGSON
bool "LOONGSON PCI Controller"
depends on MACH_LOONGSON64 || COMPILE_TEST
- depends on OF
+ depends on OF || ACPI
depends on PCI_QUIRKS
default MACH_LOONGSON64
help
diff --git a/drivers/pci/controller/pci-loongson.c b/drivers/pci/controller/pci-loongson.c
index 50a8e1d6f70a..05c50408f13b 100644
--- a/drivers/pci/controller/pci-loongson.c
+++ b/drivers/pci/controller/pci-loongson.c
@@ -9,6 +9,8 @@
#include <linux/of_pci.h>
#include <linux/pci.h>
#include <linux/pci_ids.h>
+#include <linux/pci-acpi.h>
+#include <linux/pci-ecam.h>
#include "../pci.h"
@@ -18,18 +20,31 @@
#define DEV_PCIE_PORT_2 0x7a29
#define DEV_LS2K_APB 0x7a02
-#define DEV_LS7A_CONF 0x7a10
+#define DEV_LS7A_GMAC 0x7a03
+#define DEV_LS7A_DC1 0x7a06
#define DEV_LS7A_LPC 0x7a0c
+#define DEV_LS7A_AHCI 0x7a08
+#define DEV_LS7A_CONF 0x7a10
+#define DEV_LS7A_GNET 0x7a13
+#define DEV_LS7A_EHCI 0x7a14
+#define DEV_LS7A_DC2 0x7a36
+#define DEV_LS7A_HDMI 0x7a37
#define FLAG_CFG0 BIT(0)
#define FLAG_CFG1 BIT(1)
#define FLAG_DEV_FIX BIT(2)
+#define FLAG_DEV_HIDDEN BIT(3)
+
+struct loongson_pci_data {
+ u32 flags;
+ struct pci_ops *ops;
+};
struct loongson_pci {
void __iomem *cfg0_base;
void __iomem *cfg1_base;
struct platform_device *pdev;
- u32 flags;
+ const struct loongson_pci_data *data;
};
/* Fixup wrong class code in PCIe bridges */
@@ -92,55 +107,106 @@ static void loongson_mrrs_quirk(struct pci_dev *dev)
}
DECLARE_PCI_FIXUP_ENABLE(PCI_ANY_ID, PCI_ANY_ID, loongson_mrrs_quirk);
-static void __iomem *cfg1_map(struct loongson_pci *priv, int bus,
- unsigned int devfn, int where)
+static void loongson_pci_pin_quirk(struct pci_dev *pdev)
{
- unsigned long addroff = 0x0;
+ pdev->pin = 1 + (PCI_FUNC(pdev->devfn) & 3);
+}
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LOONGSON,
+ DEV_LS7A_DC1, loongson_pci_pin_quirk);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LOONGSON,
+ DEV_LS7A_DC2, loongson_pci_pin_quirk);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LOONGSON,
+ DEV_LS7A_GMAC, loongson_pci_pin_quirk);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LOONGSON,
+ DEV_LS7A_AHCI, loongson_pci_pin_quirk);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LOONGSON,
+ DEV_LS7A_EHCI, loongson_pci_pin_quirk);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LOONGSON,
+ DEV_LS7A_GNET, loongson_pci_pin_quirk);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LOONGSON,
+ DEV_LS7A_HDMI, loongson_pci_pin_quirk);
+
+static struct loongson_pci *pci_bus_to_loongson_pci(struct pci_bus *bus)
+{
+ struct pci_config_window *cfg;
- if (bus != 0)
- addroff |= BIT(28); /* Type 1 Access */
- addroff |= (where & 0xff) | ((where & 0xf00) << 16);
- addroff |= (bus << 16) | (devfn << 8);
- return priv->cfg1_base + addroff;
+ if (acpi_disabled)
+ return (struct loongson_pci *)(bus->sysdata);
+
+ cfg = bus->sysdata;
+ return (struct loongson_pci *)(cfg->priv);
}
-static void __iomem *cfg0_map(struct loongson_pci *priv, int bus,
- unsigned int devfn, int where)
+static void __iomem *cfg0_map(struct loongson_pci *priv, struct pci_bus *bus,
+ unsigned int devfn, int where)
{
unsigned long addroff = 0x0;
+ unsigned char busnum = bus->number;
- if (bus != 0)
+ if (!pci_is_root_bus(bus)) {
addroff |= BIT(24); /* Type 1 Access */
- addroff |= (bus << 16) | (devfn << 8) | where;
+ addroff |= (busnum << 16);
+ }
+ addroff |= (devfn << 8) | where;
return priv->cfg0_base + addroff;
}
-static void __iomem *pci_loongson_map_bus(struct pci_bus *bus, unsigned int devfn,
- int where)
+static void __iomem *cfg1_map(struct loongson_pci *priv, struct pci_bus *bus,
+ unsigned int devfn, int where)
{
+ unsigned long addroff = 0x0;
unsigned char busnum = bus->number;
- struct pci_host_bridge *bridge = pci_find_host_bridge(bus);
- struct loongson_pci *priv = pci_host_bridge_priv(bridge);
+
+ if (!pci_is_root_bus(bus)) {
+ addroff |= BIT(28); /* Type 1 Access */
+ addroff |= (busnum << 16);
+ }
+ addroff |= (devfn << 8) | (where & 0xff) | ((where & 0xf00) << 16);
+ return priv->cfg1_base + addroff;
+}
+
+static bool pdev_may_exist(struct pci_bus *bus, unsigned int device,
+ unsigned int function)
+{
+ return !(pci_is_root_bus(bus) &&
+ (device >= 9 && device <= 20) && (function > 0));
+}
+
+static void __iomem *pci_loongson_map_bus(struct pci_bus *bus,
+ unsigned int devfn, int where)
+{
+ unsigned int device = PCI_SLOT(devfn);
+ unsigned int function = PCI_FUNC(devfn);
+ struct loongson_pci *priv = pci_bus_to_loongson_pci(bus);
/*
* Do not read more than one device on the bus other than
- * the host bus. For our hardware the root bus is always bus 0.
+ * the host bus.
*/
- if (priv->flags & FLAG_DEV_FIX && busnum != 0 &&
- PCI_SLOT(devfn) > 0)
- return NULL;
+ if ((priv->data->flags & FLAG_DEV_FIX) && bus->self) {
+ if (!pci_is_root_bus(bus) && (device > 0))
+ return NULL;
+ }
+
+ /* Don't access non-existent devices */
+ if (priv->data->flags & FLAG_DEV_HIDDEN) {
+ if (!pdev_may_exist(bus, device, function))
+ return NULL;
+ }
/* CFG0 can only access standard space */
if (where < PCI_CFG_SPACE_SIZE && priv->cfg0_base)
- return cfg0_map(priv, busnum, devfn, where);
+ return cfg0_map(priv, bus, devfn, where);
/* CFG1 can access extended space */
if (where < PCI_CFG_SPACE_EXP_SIZE && priv->cfg1_base)
- return cfg1_map(priv, busnum, devfn, where);
+ return cfg1_map(priv, bus, devfn, where);
return NULL;
}
+#ifdef CONFIG_OF
+
static int loongson_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
{
int irq;
@@ -159,20 +225,42 @@ static int loongson_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
return val;
}
-/* H/w only accept 32-bit PCI operations */
+/* LS2K/LS7A accept 8/16/32-bit PCI config operations */
static struct pci_ops loongson_pci_ops = {
.map_bus = pci_loongson_map_bus,
+ .read = pci_generic_config_read,
+ .write = pci_generic_config_write,
+};
+
+/* RS780/SR5690 only accept 32-bit PCI config operations */
+static struct pci_ops loongson_pci_ops32 = {
+ .map_bus = pci_loongson_map_bus,
.read = pci_generic_config_read32,
.write = pci_generic_config_write32,
};
+static const struct loongson_pci_data ls2k_pci_data = {
+ .flags = FLAG_CFG1 | FLAG_DEV_FIX | FLAG_DEV_HIDDEN,
+ .ops = &loongson_pci_ops,
+};
+
+static const struct loongson_pci_data ls7a_pci_data = {
+ .flags = FLAG_CFG1 | FLAG_DEV_FIX | FLAG_DEV_HIDDEN,
+ .ops = &loongson_pci_ops,
+};
+
+static const struct loongson_pci_data rs780e_pci_data = {
+ .flags = FLAG_CFG0,
+ .ops = &loongson_pci_ops32,
+};
+
static const struct of_device_id loongson_pci_of_match[] = {
{ .compatible = "loongson,ls2k-pci",
- .data = (void *)(FLAG_CFG0 | FLAG_CFG1 | FLAG_DEV_FIX), },
+ .data = &ls2k_pci_data, },
{ .compatible = "loongson,ls7a-pci",
- .data = (void *)(FLAG_CFG0 | FLAG_CFG1 | FLAG_DEV_FIX), },
+ .data = &ls7a_pci_data, },
{ .compatible = "loongson,rs780e-pci",
- .data = (void *)(FLAG_CFG0), },
+ .data = &rs780e_pci_data, },
{}
};
@@ -193,20 +281,20 @@ static int loongson_pci_probe(struct platform_device *pdev)
priv = pci_host_bridge_priv(bridge);
priv->pdev = pdev;
- priv->flags = (unsigned long)of_device_get_match_data(dev);
+ priv->data = of_device_get_match_data(dev);
- regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!regs) {
- dev_err(dev, "missing mem resources for cfg0\n");
- return -EINVAL;
+ if (priv->data->flags & FLAG_CFG0) {
+ regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!regs)
+ dev_err(dev, "missing mem resources for cfg0\n");
+ else {
+ priv->cfg0_base = devm_pci_remap_cfg_resource(dev, regs);
+ if (IS_ERR(priv->cfg0_base))
+ return PTR_ERR(priv->cfg0_base);
+ }
}
- priv->cfg0_base = devm_pci_remap_cfg_resource(dev, regs);
- if (IS_ERR(priv->cfg0_base))
- return PTR_ERR(priv->cfg0_base);
-
- /* CFG1 is optional */
- if (priv->flags & FLAG_CFG1) {
+ if (priv->data->flags & FLAG_CFG1) {
regs = platform_get_resource(pdev, IORESOURCE_MEM, 1);
if (!regs)
dev_info(dev, "missing mem resource for cfg1\n");
@@ -218,7 +306,7 @@ static int loongson_pci_probe(struct platform_device *pdev)
}
bridge->sysdata = priv;
- bridge->ops = &loongson_pci_ops;
+ bridge->ops = priv->data->ops;
bridge->map_irq = loongson_map_irq;
return pci_host_probe(bridge);
@@ -232,3 +320,41 @@ static struct platform_driver loongson_pci_driver = {
.probe = loongson_pci_probe,
};
builtin_platform_driver(loongson_pci_driver);
+
+#endif
+
+#ifdef CONFIG_ACPI
+
+static int loongson_pci_ecam_init(struct pci_config_window *cfg)
+{
+ struct device *dev = cfg->parent;
+ struct loongson_pci *priv;
+ struct loongson_pci_data *data;
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ cfg->priv = priv;
+ data->flags = FLAG_CFG1 | FLAG_DEV_HIDDEN;
+ priv->data = data;
+ priv->cfg1_base = cfg->win - (cfg->busr.start << 16);
+
+ return 0;
+}
+
+const struct pci_ecam_ops loongson_pci_ecam_ops = {
+ .bus_shift = 16,
+ .init = loongson_pci_ecam_init,
+ .pci_ops = {
+ .map_bus = pci_loongson_map_bus,
+ .read = pci_generic_config_read,
+ .write = pci_generic_config_write,
+ }
+};
+
+#endif