(kernel-rolling) arch: Add LoongArch Old BPI (old-world firmware interface) support

arch/loongarch/Kconfig

@@ -19,6 +19,7 @@ config LOONGARCH
 	select ARCH_HAS_KCOV
 	select ARCH_HAS_NMI_SAFE_THIS_CPU_OPS
 	select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
+	select ARCH_HAS_PHYS_TO_DMA
 	select ARCH_HAS_PTE_SPECIAL
 	select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
 	select ARCH_INLINE_READ_LOCK if !PREEMPTION

arch/loongarch/configs/deepin_loongarch_desktop_defconfig

@@ -53,6 +53,7 @@ CONFIG_KEXEC=y
 CONFIG_CRASH_DUMP=y
 CONFIG_HZ_1000=y
 CONFIG_16KB_3LEVEL=y
+CONFIG_NR_CPUS=256
 CONFIG_NUMA=y
 CONFIG_ARCH_FORCE_MAX_ORDER=12
 CONFIG_ARCH_IOREMAP=y
@@ -598,7 +599,7 @@ CONFIG_BATMAN_ADV_TRACING=y
 CONFIG_OPENVSWITCH=m
 CONFIG_VSOCKETS=m
 CONFIG_VIRTIO_VSOCKETS=m
-CONFIG_NETLINK_DIAG=m
+CONFIG_NETLINK_DIAG=y
 CONFIG_MPLS_ROUTING=m
 CONFIG_MPLS_IPTUNNEL=m
 CONFIG_HSR=m
@@ -715,6 +716,7 @@ CONFIG_NFC_S3FWRN82_UART=m
 CONFIG_NFC_ST95HF=m
 CONFIG_PAGE_POOL_STATS=y
 CONFIG_PCIEAER=y
+# CONFIG_PCIEASPM is not set
 CONFIG_PCIE_DPC=y
 CONFIG_PCIE_PTM=y
 CONFIG_PCIE_EDR=y
@@ -878,7 +880,7 @@ CONFIG_ZRAM_MEMORY_TRACKING=y
 CONFIG_BLK_DEV_LOOP=y
 CONFIG_BLK_DEV_DRBD=m
 CONFIG_BLK_DEV_NBD=m
-CONFIG_BLK_DEV_RAM=m
+CONFIG_BLK_DEV_RAM=y
 CONFIG_ATA_OVER_ETH=m
 CONFIG_VIRTIO_BLK=y
 CONFIG_BLK_DEV_RBD=m
@@ -950,7 +952,7 @@ CONFIG_GP_PCI1XXXX=m
 CONFIG_BLK_DEV_SD=y
 CONFIG_CHR_DEV_ST=m
 CONFIG_BLK_DEV_SR=m
-CONFIG_CHR_DEV_SG=m
+CONFIG_CHR_DEV_SG=y
 CONFIG_CHR_DEV_SCH=m
 CONFIG_SCSI_ENCLOSURE=m
 CONFIG_SCSI_CONSTANTS=y
@@ -3710,6 +3712,7 @@ CONFIG_BACKLIGHT_BD6107=m
 CONFIG_BACKLIGHT_ARCXCNN=m
 CONFIG_BACKLIGHT_RAVE_SP=m
 CONFIG_BACKLIGHT_LED=m
+# CONFIG_VGA_CONSOLE is not set
 CONFIG_FRAMEBUFFER_CONSOLE_ROTATION=y
 CONFIG_FRAMEBUFFER_CONSOLE_DEFERRED_TAKEOVER=y
 CONFIG_LOGO=y
@@ -4730,6 +4733,7 @@ CONFIG_RTC_DRV_DS2404=m
 CONFIG_RTC_DRV_DA9052=m
 CONFIG_RTC_DRV_DA9055=m
 CONFIG_RTC_DRV_DA9063=m
+CONFIG_RTC_DRV_EFI=y
 CONFIG_RTC_DRV_STK17TA8=m
 CONFIG_RTC_DRV_M48T86=m
 CONFIG_RTC_DRV_M48T35=m
@@ -4744,7 +4748,7 @@ CONFIG_RTC_DRV_CADENCE=m
 CONFIG_RTC_DRV_FTRTC010=m
 CONFIG_RTC_DRV_PCAP=m
 CONFIG_RTC_DRV_MC13XXX=m
-CONFIG_RTC_DRV_LOONGSON=m
+CONFIG_RTC_DRV_LOONGSON=y
 CONFIG_RTC_DRV_MT6397=m
 CONFIG_RTC_DRV_R7301=m
 CONFIG_RTC_DRV_CPCAP=m
@@ -5610,11 +5614,11 @@ CONFIG_MOST_SND=m
 CONFIG_PECI=m
 CONFIG_HTE=y
 CONFIG_VALIDATE_FS_PARSER=y
-CONFIG_EXT2_FS=m
+CONFIG_EXT2_FS=y
 CONFIG_EXT2_FS_XATTR=y
 CONFIG_EXT2_FS_POSIX_ACL=y
 CONFIG_EXT2_FS_SECURITY=y
-CONFIG_EXT3_FS=m
+CONFIG_EXT3_FS=y
 CONFIG_EXT3_FS_POSIX_ACL=y
 CONFIG_EXT3_FS_SECURITY=y
 CONFIG_EXT4_FS=y

arch/loongarch/include/asm/addrspace.h

@@ -124,6 +124,7 @@ extern unsigned long vm_map_base;
 #define PCI_IOSIZE	SZ_32M
 #define ISA_IOSIZE	SZ_16K
 #define IO_SPACE_LIMIT	(PCI_IOSIZE - 1)
+#define ISA_PHY_IOBASE  LOONGSON_LIO_BASE
 
 #define PHYS_LINK_KADDR	PHYSADDR(VMLINUX_LOAD_ADDRESS)
 

arch/loongarch/include/asm/efi.h

@@ -6,6 +6,7 @@
 #define _ASM_LOONGARCH_EFI_H
 
 #include <linux/efi.h>
+#include <asm/early_ioremap.h>
 
 void __init efi_init(void);
 void __init efi_runtime_init(void);

arch/loongarch/include/asm/irq.h

@@ -53,6 +53,7 @@ struct acpi_vector_group {
 extern struct acpi_vector_group pch_group[MAX_IO_PICS];
 extern struct acpi_vector_group msi_group[MAX_IO_PICS];
 
+#define MAX_CORES_PER_EIO_NODE	256
 #define CORES_PER_EIO_NODE	4
 
 #define LOONGSON_CPU_UART0_VEC		10 /* CPU UART0 */

arch/loongarch/include/asm/loongarch.h

@@ -171,6 +171,7 @@
 /* IOCSR */
 #define iocsr_read32(reg) __iocsrrd_w(reg)
 #define iocsr_read64(reg) __iocsrrd_d(reg)
+#define iocsr_write8(val, reg)	__iocsrwr_b(val, reg)
 #define iocsr_write32(val, reg) __iocsrwr_w(val, reg)
 #define iocsr_write64(val, reg) __iocsrwr_d(val, reg)
 

arch/loongarch/kernel/Makefile

@@ -9,6 +9,7 @@ obj-y		+= head.o cpu-probe.o cacheinfo.o env.o setup.o entry.o genex.o \
 		   traps.o irq.o idle.o process.o dma.o mem.o io.o reset.o switch.o \
 		   elf.o syscall.o signal.o time.o topology.o inst.o ptrace.o vdso.o \
 		   alternative.o unwind.o
+obj-y		+= legacy_boot.o
 
 obj-$(CONFIG_ACPI)		+= acpi.o
 obj-$(CONFIG_EFI) 		+= efi.o

arch/loongarch/kernel/acpi.c

@@ -17,6 +17,7 @@
 #include <asm/io.h>
 #include <asm/numa.h>
 #include <asm/loongson.h>
+#include "legacy_boot.h"
 
 int acpi_disabled;
 EXPORT_SYMBOL(acpi_disabled);
@@ -58,7 +59,7 @@ void __iomem *acpi_os_ioremap(acpi_physical_address phys, acpi_size size)
 }
 
 #ifdef CONFIG_SMP
-static int set_processor_mask(u32 id, u32 flags)
+int set_processor_mask(u32 id, u32 flags)
 {
 
 	int cpu, cpuid = id;
@@ -132,6 +133,10 @@ static void __init acpi_process_madt(void)
 		__cpu_logical_map[i] = -1;
 	}
 #endif
+
+	if (efi_bp && bpi_version <= BPI_VERSION_V1)
+		legacy_madt_table_init();
+
 	acpi_table_parse_madt(ACPI_MADT_TYPE_CORE_PIC,
 			acpi_parse_processor, MAX_CORE_PIC);
 

arch/loongarch/kernel/dma.c

@@ -4,13 +4,40 @@
  */
 #include <linux/acpi.h>
 #include <linux/dma-direct.h>
+#include <asm/loongson.h>
+
+/*
+ * We extract 4bit node id (bit 44~47) from Loongson-3's
+ * 48bit physical address space and embed it into 40bit.
+ */
+
+static int node_id_offset;
+
+dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
+{
+	long nid = (paddr >> 44) & 0xf;
+
+	return ((nid << 44) ^ paddr) | (nid << node_id_offset);
+}
+
+phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
+{
+	long nid = (daddr >> node_id_offset) & 0xf;
+
+	return ((nid << node_id_offset) ^ daddr) | (nid << 44);
+}
 
 void acpi_arch_dma_setup(struct device *dev)
 {
 	int ret;
 	u64 mask, end = 0;
 	const struct bus_dma_region *map = NULL;
 
+	if (node_id_offset == 0) {
+		node_id_offset = ((readl(LS7A_DMA_CFG) & LS7A_DMA_NODE_MASK) >> LS7A_DMA_NODE_SHF);
+		node_id_offset += 36;
+	}
+
 	ret = acpi_dma_get_range(dev, &map);
 	if (!ret && map) {
 		const struct bus_dma_region *r = map;