[PATCH 5/6] MIPS: Loongson: Add PCI support for 7A1000
From: Tiezhu Yang
Date: Mon Mar 09 2020 - 04:23:53 EST
Add PCI support for 7A1000 to detect PCI device.
Co-developed-by: Jianmin Lv <lvjianmin@xxxxxxxxxxx>
Signed-off-by: Jianmin Lv <lvjianmin@xxxxxxxxxxx>
Signed-off-by: Tiezhu Yang <yangtiezhu@xxxxxxxxxxx>
---
arch/mips/include/asm/mach-loongson64/pci.h | 1 +
arch/mips/loongson64/pci.c | 12 ++-
arch/mips/pci/Makefile | 2 +-
arch/mips/pci/ops-loongson3-ls7a.c | 132 ++++++++++++++++++++++++++++
4 files changed, 143 insertions(+), 4 deletions(-)
create mode 100644 arch/mips/pci/ops-loongson3-ls7a.c
diff --git a/arch/mips/include/asm/mach-loongson64/pci.h b/arch/mips/include/asm/mach-loongson64/pci.h
index 8b59d64..42c9744 100644
--- a/arch/mips/include/asm/mach-loongson64/pci.h
+++ b/arch/mips/include/asm/mach-loongson64/pci.h
@@ -8,6 +8,7 @@
#define __ASM_MACH_LOONGSON64_PCI_H_
extern struct pci_ops loongson_pci_ops;
+extern struct pci_ops loongson_ls7a_pci_ops;
/* this is an offset from mips_io_port_base */
#define LOONGSON_PCI_IO_START 0x00004000UL
diff --git a/arch/mips/loongson64/pci.c b/arch/mips/loongson64/pci.c
index e84ae20..b79368f 100644
--- a/arch/mips/loongson64/pci.c
+++ b/arch/mips/loongson64/pci.c
@@ -23,8 +23,8 @@ static struct resource loongson_pci_io_resource = {
.flags = IORESOURCE_IO,
};
-static struct pci_controller loongson_pci_controller = {
- .pci_ops = &loongson_pci_ops,
+static struct pci_controller loongson_pci_controller = {
+ .pci_ops = NULL,
.io_resource = &loongson_pci_io_resource,
.mem_resource = &loongson_pci_mem_resource,
.mem_offset = 0x00000000UL,
@@ -36,6 +36,11 @@ extern int sbx00_acpi_init(void);
static int __init pcibios_init(void)
{
+ if (strstr(eboard->name, "780E"))
+ loongson_pci_controller.pci_ops = &loongson_pci_ops;
+
+ if (strstr(eboard->name, "7A1000"))
+ loongson_pci_controller.pci_ops = &loongson_ls7a_pci_ops;
loongson_pci_controller.io_map_base = mips_io_port_base;
loongson_pci_mem_resource.start = loongson_sysconf.pci_mem_start_addr;
@@ -43,7 +48,8 @@ static int __init pcibios_init(void)
register_pci_controller(&loongson_pci_controller);
- sbx00_acpi_init();
+ if (strstr(eboard->name, "780E"))
+ sbx00_acpi_init();
return 0;
}
diff --git a/arch/mips/pci/Makefile b/arch/mips/pci/Makefile
index 342ce10..7256bb1 100644
--- a/arch/mips/pci/Makefile
+++ b/arch/mips/pci/Makefile
@@ -35,7 +35,7 @@ obj-$(CONFIG_LASAT) += pci-lasat.o
obj-$(CONFIG_MIPS_COBALT) += fixup-cobalt.o
obj-$(CONFIG_LEMOTE_FULOONG2E) += fixup-fuloong2e.o ops-loongson2.o
obj-$(CONFIG_LEMOTE_MACH2F) += fixup-lemote2f.o ops-loongson2.o
-obj-$(CONFIG_MACH_LOONGSON64) += fixup-loongson3.o ops-loongson3.o
+obj-$(CONFIG_MACH_LOONGSON64) += fixup-loongson3.o ops-loongson3.o ops-loongson3-ls7a.o
obj-$(CONFIG_MIPS_MALTA) += fixup-malta.o pci-malta.o
obj-$(CONFIG_PMC_MSP7120_GW) += fixup-pmcmsp.o ops-pmcmsp.o
obj-$(CONFIG_PMC_MSP7120_EVAL) += fixup-pmcmsp.o ops-pmcmsp.o
diff --git a/arch/mips/pci/ops-loongson3-ls7a.c b/arch/mips/pci/ops-loongson3-ls7a.c
new file mode 100644
index 0000000..4ed6c40
--- /dev/null
+++ b/arch/mips/pci/ops-loongson3-ls7a.c
@@ -0,0 +1,132 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2020 Loongson Technology Corporation Limited
+ *
+ * Author: Jianmin Lv <lvjianmin@xxxxxxxxxxx>
+ * Author: Tiezhu Yang <yangtiezhu@xxxxxxxxxxx>
+ */
+
+#include <linux/types.h>
+#include <linux/pci.h>
+#include <linux/kernel.h>
+
+#include <asm/mips-boards/bonito64.h>
+
+#include <loongson.h>
+
+#define PCI_ACCESS_READ 0
+#define PCI_ACCESS_WRITE 1
+
+#define HT1LO_PCICFG_BASE 0x1a000000
+#define HT1LO_PCICFG_BASE_TP1 0x1b000000
+
+#define HT1LO_PCICFG_BASE_EXT 0xefe00000000
+#define HT1LO_PCICFG_BASE_TP1_EXT 0xefe10000000
+
+static int ls7a_pci_config_access(unsigned char access_type,
+ struct pci_bus *bus, unsigned int devfn,
+ int where, u32 *data)
+{
+ u_int64_t addr;
+ void *addrp;
+ unsigned char busnum = bus->number;
+ int device = PCI_SLOT(devfn);
+ int function = PCI_FUNC(devfn);
+ int reg = where & ~3;
+
+ if (where >= PCI_CFG_SPACE_EXP_SIZE)
+ return PCIBIOS_DEVICE_NOT_FOUND;
+
+ if (busnum == 0 && device > 23)
+ return PCIBIOS_DEVICE_NOT_FOUND;
+
+ if (where < PCI_CFG_SPACE_SIZE) { /* standard config */
+ addr = (busnum << 16) | (device << 11) | (function << 8) | reg;
+ if (busnum == 0) {
+ addr = HT1LO_PCICFG_BASE | addr;
+ addrp = (void *)TO_UNCAC(addr);
+ } else {
+ addr = HT1LO_PCICFG_BASE_TP1 | addr;
+ addrp = (void *)TO_UNCAC(addr);
+ }
+ } else { /* extended config */
+ reg = (reg & 0xff) | ((reg & 0xf00) << 16);
+ addr = (busnum << 16) | (device << 11) | (function << 8) | reg;
+ if (busnum == 0) {
+ addr = HT1LO_PCICFG_BASE_EXT | addr;
+ addrp = (void *)TO_UNCAC(addr);
+ } else {
+ addr = HT1LO_PCICFG_BASE_TP1_EXT | addr;
+ addrp = (void *)TO_UNCAC(addr);
+ }
+ }
+
+ if (access_type == PCI_ACCESS_WRITE)
+ *(unsigned int *)addrp = cpu_to_le32(*data);
+ else {
+ *data = le32_to_cpu(*(unsigned int *)addrp);
+ if (busnum == 0 &&
+ reg == PCI_CLASS_REVISION && *data == 0x06000001)
+ *data = (PCI_CLASS_BRIDGE_PCI << 16) | (*data & 0xffff);
+
+ if (*data == 0xffffffff) {
+ *data = -1;
+ return PCIBIOS_DEVICE_NOT_FOUND;
+ }
+ }
+
+ return PCIBIOS_SUCCESSFUL;
+}
+
+static int ls7a_pci_pcibios_read(struct pci_bus *bus, unsigned int devfn,
+ int where, int size, u32 *val)
+{
+ int ret;
+ u32 data = 0;
+
+ ret = ls7a_pci_config_access(PCI_ACCESS_READ, bus, devfn, where, &data);
+ if (ret != PCIBIOS_SUCCESSFUL)
+ return ret;
+
+ if (size == 1)
+ *val = (data >> ((where & 3) << 3)) & 0xff;
+ else if (size == 2)
+ *val = (data >> ((where & 3) << 3)) & 0xffff;
+ else
+ *val = data;
+
+ return PCIBIOS_SUCCESSFUL;
+}
+
+static int ls7a_pci_pcibios_write(struct pci_bus *bus, unsigned int devfn,
+ int where, int size, u32 val)
+{
+ int ret;
+ u32 data = 0;
+
+ if (size == 4)
+ data = val;
+ else {
+ ret = ls7a_pci_config_access(PCI_ACCESS_READ, bus,
+ devfn, where, &data);
+ if (ret != PCIBIOS_SUCCESSFUL)
+ return ret;
+
+ if (size == 1)
+ data = (data & ~(0xff << ((where & 3) << 3))) |
+ (val << ((where & 3) << 3));
+ else if (size == 2)
+ data = (data & ~(0xffff << ((where & 3) << 3))) |
+ (val << ((where & 3) << 3));
+ }
+
+ ret = ls7a_pci_config_access(PCI_ACCESS_WRITE, bus,
+ devfn, where, &data);
+
+ return ret;
+}
+
+struct pci_ops loongson_ls7a_pci_ops = {
+ .read = ls7a_pci_pcibios_read,
+ .write = ls7a_pci_pcibios_write
+};
--
2.1.0