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authorHuacai Chen <chenhuacai@loongson.cn>2022-08-06 15:19:33 +0800
committerHuacai Chen <chenhuacai@loongson.cn>2022-08-12 13:10:11 +0800
commit57fc7323a8e7c2e7c1d5795ab63cb3ffea3cfdfb (patch)
tree3c0499d025c9634137c6a34229f2fabae2295a5e /arch
parente9e7ff16d7f098f6fa9394e9d2b191c01ba0d5f6 (diff)
LoongArch: Add PCI controller support
Loongson64 based systems are PC-like systems which use PCI/PCIe as its I/O bus, This patch adds the PCI host controller support for LoongArch. Reviewed-by: WANG Xuerui <git@xen0n.name> Signed-off-by: Jianmin Lv <lvjianmin@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Diffstat (limited to 'arch')
-rw-r--r--arch/loongarch/Kconfig7
-rw-r--r--arch/loongarch/Makefile2
-rw-r--r--arch/loongarch/include/asm/dma.h11
-rw-r--r--arch/loongarch/include/asm/irq.h8
-rw-r--r--arch/loongarch/include/asm/page.h2
-rw-r--r--arch/loongarch/include/asm/pci.h25
-rw-r--r--arch/loongarch/pci/acpi.c175
-rw-r--r--arch/loongarch/pci/pci.c101
8 files changed, 321 insertions, 10 deletions
diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig
index 4ea781e44425..5b4f7bdf69fa 100644
--- a/arch/loongarch/Kconfig
+++ b/arch/loongarch/Kconfig
@@ -4,6 +4,7 @@ config LOONGARCH
default y
select ACPI
select ACPI_GENERIC_GSI if ACPI
+ select ACPI_MCFG if ACPI
select ACPI_SYSTEM_POWER_STATES_SUPPORT if ACPI
select ARCH_BINFMT_ELF_STATE
select ARCH_ENABLE_MEMORY_HOTPLUG
@@ -88,6 +89,7 @@ config LOONGARCH
select HAVE_IRQ_TIME_ACCOUNTING
select HAVE_MOD_ARCH_SPECIFIC
select HAVE_NMI
+ select HAVE_PCI
select HAVE_PERF_EVENTS
select HAVE_REGS_AND_STACK_ACCESS_API
select HAVE_RSEQ
@@ -103,6 +105,11 @@ config LOONGARCH
select NEED_PER_CPU_PAGE_FIRST_CHUNK
select OF
select OF_EARLY_FLATTREE
+ select PCI
+ select PCI_DOMAINS_GENERIC
+ select PCI_ECAM if ACPI
+ select PCI_LOONGSON
+ select PCI_MSI_ARCH_FALLBACKS
select PERF_USE_VMALLOC
select RTC_LIB
select SMP
diff --git a/arch/loongarch/Makefile b/arch/loongarch/Makefile
index fbe4277e6404..ec3de6191276 100644
--- a/arch/loongarch/Makefile
+++ b/arch/loongarch/Makefile
@@ -47,6 +47,8 @@ cflags-y += $(call cc-option, -mno-check-zero-division)
load-y = 0x9000000000200000
bootvars-y = VMLINUX_LOAD_ADDRESS=$(load-y)
+drivers-$(CONFIG_PCI) += arch/loongarch/pci/
+
KBUILD_AFLAGS += $(cflags-y)
KBUILD_CFLAGS += $(cflags-y)
KBUILD_CPPFLAGS += -DVMLINUX_LOAD_ADDRESS=$(load-y)
diff --git a/arch/loongarch/include/asm/dma.h b/arch/loongarch/include/asm/dma.h
new file mode 100644
index 000000000000..1a8866319fe2
--- /dev/null
+++ b/arch/loongarch/include/asm/dma.h
@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
+ */
+#ifndef __ASM_DMA_H
+#define __ASM_DMA_H
+
+#define MAX_DMA_ADDRESS PAGE_OFFSET
+#define MAX_DMA32_PFN (1UL << (32 - PAGE_SHIFT))
+
+#endif
diff --git a/arch/loongarch/include/asm/irq.h b/arch/loongarch/include/asm/irq.h
index f6c2455b4584..4b130199ceae 100644
--- a/arch/loongarch/include/asm/irq.h
+++ b/arch/loongarch/include/asm/irq.h
@@ -98,16 +98,8 @@ struct irq_domain *htvec_acpi_init(struct irq_domain *parent,
struct acpi_madt_ht_pic *acpi_htvec);
int pch_lpc_acpi_init(struct irq_domain *parent,
struct acpi_madt_lpc_pic *acpi_pchlpc);
-#if IS_ENABLED(CONFIG_LOONGSON_PCH_MSI)
int pch_msi_acpi_init(struct irq_domain *parent,
struct acpi_madt_msi_pic *acpi_pchmsi);
-#else
-static inline int pch_msi_acpi_init(struct irq_domain *parent,
- struct acpi_madt_msi_pic *acpi_pchmsi)
-{
- return 0;
-}
-#endif
int pch_pic_acpi_init(struct irq_domain *parent,
struct acpi_madt_bio_pic *acpi_pchpic);
int find_pch_pic(u32 gsi);
diff --git a/arch/loongarch/include/asm/page.h b/arch/loongarch/include/asm/page.h
index dc47fc724fa1..a37324ac460b 100644
--- a/arch/loongarch/include/asm/page.h
+++ b/arch/loongarch/include/asm/page.h
@@ -33,8 +33,6 @@
#include <linux/kernel.h>
#include <linux/pfn.h>
-#define MAX_DMA32_PFN (1UL << (32 - PAGE_SHIFT))
-
/*
* It's normally defined only for FLATMEM config but it's
* used in our early mem init code for all memory models.
diff --git a/arch/loongarch/include/asm/pci.h b/arch/loongarch/include/asm/pci.h
new file mode 100644
index 000000000000..846909d7e831
--- /dev/null
+++ b/arch/loongarch/include/asm/pci.h
@@ -0,0 +1,25 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
+ */
+#ifndef _ASM_PCI_H
+#define _ASM_PCI_H
+
+#include <linux/ioport.h>
+#include <linux/list.h>
+#include <linux/types.h>
+#include <asm/io.h>
+
+#define PCIBIOS_MIN_IO 0x4000
+#define PCIBIOS_MIN_MEM 0x20000000
+#define PCIBIOS_MIN_CARDBUS_IO 0x4000
+
+#define HAVE_PCI_MMAP
+#define pcibios_assign_all_busses() 0
+
+extern phys_addr_t mcfg_addr_init(int node);
+
+/* generic pci stuff */
+#include <asm-generic/pci.h>
+
+#endif /* _ASM_PCI_H */
diff --git a/arch/loongarch/pci/acpi.c b/arch/loongarch/pci/acpi.c
new file mode 100644
index 000000000000..bf921487333c
--- /dev/null
+++ b/arch/loongarch/pci/acpi.c
@@ -0,0 +1,175 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
+ */
+#include <linux/pci.h>
+#include <linux/acpi.h>
+#include <linux/init.h>
+#include <linux/irq.h>
+#include <linux/slab.h>
+#include <linux/pci-acpi.h>
+#include <linux/pci-ecam.h>
+
+#include <asm/pci.h>
+#include <asm/numa.h>
+#include <asm/loongson.h>
+
+struct pci_root_info {
+ struct acpi_pci_root_info common;
+ struct pci_config_window *cfg;
+};
+
+void pcibios_add_bus(struct pci_bus *bus)
+{
+ acpi_pci_add_bus(bus);
+}
+
+int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
+{
+ struct pci_config_window *cfg = bridge->bus->sysdata;
+ struct acpi_device *adev = to_acpi_device(cfg->parent);
+ struct device *bus_dev = &bridge->bus->dev;
+
+ ACPI_COMPANION_SET(&bridge->dev, adev);
+ set_dev_node(bus_dev, pa_to_nid(cfg->res.start));
+
+ return 0;
+}
+
+int acpi_pci_bus_find_domain_nr(struct pci_bus *bus)
+{
+ struct pci_config_window *cfg = bus->sysdata;
+ struct acpi_device *adev = to_acpi_device(cfg->parent);
+ struct acpi_pci_root *root = acpi_driver_data(adev);
+
+ return root->segment;
+}
+
+static void acpi_release_root_info(struct acpi_pci_root_info *ci)
+{
+ struct pci_root_info *info;
+
+ info = container_of(ci, struct pci_root_info, common);
+ pci_ecam_free(info->cfg);
+ kfree(ci->ops);
+ kfree(info);
+}
+
+static int acpi_prepare_root_resources(struct acpi_pci_root_info *ci)
+{
+ int status;
+ struct resource_entry *entry, *tmp;
+ struct acpi_device *device = ci->bridge;
+
+ status = acpi_pci_probe_root_resources(ci);
+ if (status > 0) {
+ resource_list_for_each_entry_safe(entry, tmp, &ci->resources) {
+ if (entry->res->flags & IORESOURCE_MEM) {
+ entry->offset = ci->root->mcfg_addr & GENMASK_ULL(63, 40);
+ entry->res->start |= entry->offset;
+ entry->res->end |= entry->offset;
+ }
+ }
+ return status;
+ }
+
+ resource_list_for_each_entry_safe(entry, tmp, &ci->resources) {
+ dev_dbg(&device->dev,
+ "host bridge window %pR (ignored)\n", entry->res);
+ resource_list_destroy_entry(entry);
+ }
+
+ return 0;
+}
+
+/*
+ * Lookup the bus range for the domain in MCFG, and set up config space
+ * mapping.
+ */
+static struct pci_config_window *
+pci_acpi_setup_ecam_mapping(struct acpi_pci_root *root)
+{
+ int ret, bus_shift;
+ u16 seg = root->segment;
+ struct device *dev = &root->device->dev;
+ struct resource cfgres;
+ struct resource *bus_res = &root->secondary;
+ struct pci_config_window *cfg;
+ const struct pci_ecam_ops *ecam_ops;
+
+ ret = pci_mcfg_lookup(root, &cfgres, &ecam_ops);
+ if (ret < 0) {
+ dev_err(dev, "%04x:%pR ECAM region not found, use default value\n", seg, bus_res);
+ ecam_ops = &loongson_pci_ecam_ops;
+ root->mcfg_addr = mcfg_addr_init(0);
+ }
+
+ bus_shift = ecam_ops->bus_shift ? : 20;
+
+ cfgres.start = root->mcfg_addr + (bus_res->start << bus_shift);
+ cfgres.end = cfgres.start + (resource_size(bus_res) << bus_shift) - 1;
+ cfgres.flags = IORESOURCE_MEM;
+
+ cfg = pci_ecam_create(dev, &cfgres, bus_res, ecam_ops);
+ if (IS_ERR(cfg)) {
+ dev_err(dev, "%04x:%pR error %ld mapping ECAM\n", seg, bus_res, PTR_ERR(cfg));
+ return NULL;
+ }
+
+ return cfg;
+}
+
+struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
+{
+ struct pci_bus *bus;
+ struct pci_root_info *info;
+ struct acpi_pci_root_ops *root_ops;
+ int domain = root->segment;
+ int busnum = root->secondary.start;
+
+ info = kzalloc(sizeof(*info), GFP_KERNEL);
+ if (!info) {
+ pr_warn("pci_bus %04x:%02x: ignored (out of memory)\n", domain, busnum);
+ return NULL;
+ }
+
+ root_ops = kzalloc(sizeof(*root_ops), GFP_KERNEL);
+ if (!root_ops) {
+ kfree(info);
+ return NULL;
+ }
+
+ info->cfg = pci_acpi_setup_ecam_mapping(root);
+ if (!info->cfg) {
+ kfree(info);
+ kfree(root_ops);
+ return NULL;
+ }
+
+ root_ops->release_info = acpi_release_root_info;
+ root_ops->prepare_resources = acpi_prepare_root_resources;
+ root_ops->pci_ops = (struct pci_ops *)&info->cfg->ops->pci_ops;
+
+ bus = pci_find_bus(domain, busnum);
+ if (bus) {
+ memcpy(bus->sysdata, info->cfg, sizeof(struct pci_config_window));
+ kfree(info);
+ } else {
+ struct pci_bus *child;
+
+ bus = acpi_pci_root_create(root, root_ops,
+ &info->common, info->cfg);
+ if (!bus) {
+ kfree(info);
+ kfree(root_ops);
+ return NULL;
+ }
+
+ pci_bus_size_bridges(bus);
+ pci_bus_assign_resources(bus);
+ list_for_each_entry(child, &bus->children, node)
+ pcie_bus_configure_settings(child);
+ }
+
+ return bus;
+}
diff --git a/arch/loongarch/pci/pci.c b/arch/loongarch/pci/pci.c
new file mode 100644
index 000000000000..e9b7c34d9b6d
--- /dev/null
+++ b/arch/loongarch/pci/pci.c
@@ -0,0 +1,101 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
+ */
+#include <linux/kernel.h>
+#include <linux/export.h>
+#include <linux/init.h>
+#include <linux/acpi.h>
+#include <linux/types.h>
+#include <linux/pci.h>
+#include <linux/vgaarb.h>
+#include <asm/loongson.h>
+
+#define PCI_DEVICE_ID_LOONGSON_HOST 0x7a00
+#define PCI_DEVICE_ID_LOONGSON_DC1 0x7a06
+#define PCI_DEVICE_ID_LOONGSON_DC2 0x7a36
+
+int raw_pci_read(unsigned int domain, unsigned int bus, unsigned int devfn,
+ int reg, int len, u32 *val)
+{
+ struct pci_bus *bus_tmp = pci_find_bus(domain, bus);
+
+ if (bus_tmp)
+ return bus_tmp->ops->read(bus_tmp, devfn, reg, len, val);
+ return -EINVAL;
+}
+
+int raw_pci_write(unsigned int domain, unsigned int bus, unsigned int devfn,
+ int reg, int len, u32 val)
+{
+ struct pci_bus *bus_tmp = pci_find_bus(domain, bus);
+
+ if (bus_tmp)
+ return bus_tmp->ops->write(bus_tmp, devfn, reg, len, val);
+ return -EINVAL;
+}
+
+phys_addr_t mcfg_addr_init(int node)
+{
+ return (((u64)node << 44) | MCFG_EXT_PCICFG_BASE);
+}
+
+static int __init pcibios_init(void)
+{
+ unsigned int lsize;
+
+ /*
+ * Set PCI cacheline size to that of the highest level in the
+ * cache hierarchy.
+ */
+ lsize = cpu_dcache_line_size();
+ lsize = cpu_vcache_line_size() ? : lsize;
+ lsize = cpu_scache_line_size() ? : lsize;
+
+ BUG_ON(!lsize);
+
+ pci_dfl_cache_line_size = lsize >> 2;
+
+ pr_debug("PCI: pci_cache_line_size set to %d bytes\n", lsize);
+
+ return 0;
+}
+
+subsys_initcall(pcibios_init);
+
+int pcibios_device_add(struct pci_dev *dev)
+{
+ int id;
+ struct irq_domain *dom;
+
+ id = pci_domain_nr(dev->bus);
+ dom = irq_find_matching_fwnode(get_pch_msi_handle(id), DOMAIN_BUS_PCI_MSI);
+ dev_set_msi_domain(&dev->dev, dom);
+
+ return 0;
+}
+
+int pcibios_alloc_irq(struct pci_dev *dev)
+{
+ if (acpi_disabled)
+ return 0;
+ if (pci_dev_msi_enabled(dev))
+ return 0;
+ return acpi_pci_irq_enable(dev);
+}
+
+static void pci_fixup_vgadev(struct pci_dev *pdev)
+{
+ struct pci_dev *devp = NULL;
+
+ while ((devp = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, devp))) {
+ if (devp->vendor != PCI_VENDOR_ID_LOONGSON) {
+ vga_set_default_device(devp);
+ dev_info(&pdev->dev,
+ "Overriding boot device as %X:%X\n",
+ devp->vendor, devp->device);
+ }
+ }
+}
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LOONGSON, PCI_DEVICE_ID_LOONGSON_DC1, pci_fixup_vgadev);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LOONGSON, PCI_DEVICE_ID_LOONGSON_DC2, pci_fixup_vgadev);

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