MIPS: Loongson: Add UEFI-like firmware interface (LEFI) support

The new UEFI-like firmware interface (LEFI, i.e. Loongson Unified
Firmware Interface) has 3 advantages:

1, Firmware export a physical memory map which is similar to X86's
   E820 map, so prom_init_memory() will be more elegant that #ifdef
   clauses can be removed.
2, Firmware export a pci irq routing table, we no longer need pci
   irq routing fixup in kernel's code.
3, Firmware has a built-in vga bios, and its address is exported,
   the linux kernel no longer need an embedded blob.

With the LEFI interface, Loongson-3A/2G and all their successors can use
a unified kernel. All Loongson-based machines support this new interface
except 2E/2F series.

Signed-off-by: Huacai Chen <chenhc@lemote.com>
Signed-off-by: Hongliang Tao <taohl@lemote.com>
Signed-off-by: Hua Yan <yanh@lemote.com>
Tested-by: Alex Smith <alex.smith@imgtec.com>
Reviewed-by: Alex Smith <alex.smith@imgtec.com>
Cc: John Crispin <john@phrozen.org>
Cc: Steven J. Hill <Steven.Hill@imgtec.com>
Cc: Aurelien Jarno <aurelien@aurel32.net>
Cc: linux-mips@linux-mips.org
Cc: Fuxin Zhang <zhangfx@lemote.com>
Cc: Zhangjin Wu <wuzhangjin@gmail.com>
Patchwork: https://patchwork.linux-mips.org/patch/6632
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

5 files changed, 127 insertions, 18 deletions

diff --git a/arch/mips/loongson/common/env.c b/arch/mips/loongson/common/env.c
index 0a18fcf2d372..0c543eae49bf 100644
--- a/arch/mips/loongson/common/env.c
+++ b/arch/mips/loongson/common/env.c
@@ -18,29 +18,30 @@
  * option) any later version.
  */
 #include <linux/module.h>
-
 #include <asm/bootinfo.h>
-
 #include <loongson.h>
+#include <boot_param.h>
 
-unsigned long cpu_clock_freq;
+u32 cpu_clock_freq;
 EXPORT_SYMBOL(cpu_clock_freq);
-unsigned long memsize, highmemsize;
+struct efi_memory_map_loongson *loongson_memmap;
+struct loongson_system_configuration loongson_sysconf;
 
 #define parse_even_earlier(res, option, p)                              \
 do {                                                                    \
         unsigned int tmp __maybe_unused;                                \
                                                                         \
         if (strncmp(option, (char *)p, strlen(option)) == 0)            \
-                tmp = strict_strtol((char *)p + strlen(option"="), 10, &res); \
+                tmp = kstrtou32((char *)p + strlen(option"="), 10, &res); \
 } while (0)
 
 void __init prom_init_env(void)
 {
         /* pmon passes arguments in 32bit pointers */
-        int *_prom_envp;
-        unsigned long bus_clock;
         unsigned int processor_id;
+
+#ifndef CONFIG_LEFI_FIRMWARE_INTERFACE
+        int *_prom_envp;
         long l;
 
         /* firmware arguments are initialized in head.S */
@@ -48,7 +49,6 @@ void __init prom_init_env(void)
 
         l = (long)*_prom_envp;
         while (l != 0) {
-                parse_even_earlier(bus_clock, "busclock", l);
                 parse_even_earlier(cpu_clock_freq, "cpuclock", l);
                 parse_even_earlier(memsize, "memsize", l);
                 parse_even_earlier(highmemsize, "highmemsize", l);
@@ -57,8 +57,48 @@ void __init prom_init_env(void)
         }
         if (memsize == 0)
                 memsize = 256;
-        if (bus_clock == 0)
-                bus_clock = 66000000;
+        pr_info("memsize=%u, highmemsize=%u\n", memsize, highmemsize);
+#else
+        struct boot_params *boot_p;
+        struct loongson_params *loongson_p;
+        struct efi_cpuinfo_loongson *ecpu;
+        struct irq_source_routing_table *eirq_source;
+
+        /* firmware arguments are initialized in head.S */
+        boot_p = (struct boot_params *)fw_arg2;
+        loongson_p = &(boot_p->efi.smbios.lp);
+
+        ecpu = (struct efi_cpuinfo_loongson *)
+                ((u64)loongson_p + loongson_p->cpu_offset);
+        eirq_source = (struct irq_source_routing_table *)
+                ((u64)loongson_p + loongson_p->irq_offset);
+        loongson_memmap = (struct efi_memory_map_loongson *)
+                ((u64)loongson_p + loongson_p->memory_offset);
+
+        cpu_clock_freq = ecpu->cpu_clock_freq;
+        loongson_sysconf.cputype = ecpu->cputype;
+        loongson_sysconf.nr_cpus = ecpu->nr_cpus;
+        if (ecpu->nr_cpus > NR_CPUS || ecpu->nr_cpus == 0)
+                loongson_sysconf.nr_cpus = NR_CPUS;
+
+        loongson_sysconf.pci_mem_start_addr = eirq_source->pci_mem_start_addr;
+        loongson_sysconf.pci_mem_end_addr = eirq_source->pci_mem_end_addr;
+        loongson_sysconf.pci_io_base = eirq_source->pci_io_start_addr;
+        loongson_sysconf.dma_mask_bits = eirq_source->dma_mask_bits;
+        if (loongson_sysconf.dma_mask_bits < 32 ||
+                loongson_sysconf.dma_mask_bits > 64)
+                loongson_sysconf.dma_mask_bits = 32;
+
+        loongson_sysconf.restart_addr = boot_p->reset_system.ResetWarm;
+        loongson_sysconf.poweroff_addr = boot_p->reset_system.Shutdown;
+        loongson_sysconf.suspend_addr = boot_p->reset_system.DoSuspend;
+
+        loongson_sysconf.ht_control_base = 0x90000EFDFB000000;
+        loongson_sysconf.vgabios_addr = boot_p->efi.smbios.vga_bios;
+        pr_debug("Shutdown Addr: %llx, Restart Addr: %llx, VBIOS Addr: %llx\n",
+                loongson_sysconf.poweroff_addr, loongson_sysconf.restart_addr,
+                loongson_sysconf.vgabios_addr);
+#endif
         if (cpu_clock_freq == 0) {
                 processor_id = (&current_cpu_data)->processor_id;
                 switch (processor_id & PRID_REV_MASK) {
@@ -68,12 +108,13 @@ void __init prom_init_env(void)
                 case PRID_REV_LOONGSON2F:
                         cpu_clock_freq = 797000000;
                         break;
+                case PRID_REV_LOONGSON3A:
+                        cpu_clock_freq = 900000000;
+                        break;
                 default:
                         cpu_clock_freq = 100000000;
                         break;
                 }
         }
-
-        pr_info("busclock=%ld, cpuclock=%ld, memsize=%ld, highmemsize=%ld\n",
-                bus_clock, cpu_clock_freq, memsize, highmemsize);
+        pr_info("CpuClock = %u\n", cpu_clock_freq);
 }
diff --git a/arch/mips/loongson/common/init.c b/arch/mips/loongson/common/init.c
index ae7af1fd5d59..81ba3b4a8f30 100644
--- a/arch/mips/loongson/common/init.c
+++ b/arch/mips/loongson/common/init.c
@@ -17,10 +17,6 @@ unsigned long __maybe_unused _loongson_addrwincfg_base;
 
 void __init prom_init(void)
 {
-        /* init base address of io space */
-        set_io_port_base((unsigned long)
-                ioremap(LOONGSON_PCIIO_BASE, LOONGSON_PCIIO_SIZE));
-
 #ifdef CONFIG_CPU_SUPPORTS_ADDRWINCFG
         _loongson_addrwincfg_base = (unsigned long)
                 ioremap(LOONGSON_ADDRWINCFG_BASE, LOONGSON_ADDRWINCFG_SIZE);
@@ -28,6 +24,11 @@ void __init prom_init(void)
 
         prom_init_cmdline();
         prom_init_env();
+
+        /* init base address of io space */
+        set_io_port_base((unsigned long)
+                ioremap(LOONGSON_PCIIO_BASE, LOONGSON_PCIIO_SIZE));
+
         prom_init_memory();
 
         /*init the uart base address */
diff --git a/arch/mips/loongson/common/mem.c b/arch/mips/loongson/common/mem.c
index 8626a42f5b94..b01d52473da8 100644
--- a/arch/mips/loongson/common/mem.c
+++ b/arch/mips/loongson/common/mem.c
@@ -11,9 +11,14 @@
 #include <asm/bootinfo.h>
 
 #include <loongson.h>
+#include <boot_param.h>
 #include <mem.h>
 #include <pci.h>
 
+#ifndef CONFIG_LEFI_FIRMWARE_INTERFACE
+
+u32 memsize, highmemsize;
+
 void __init prom_init_memory(void)
 {
         add_memory_region(0x0, (memsize << 20), BOOT_MEM_RAM);
@@ -49,6 +54,43 @@ void __init prom_init_memory(void)
 #endif /* !CONFIG_64BIT */
 }
 
+#else /* CONFIG_LEFI_FIRMWARE_INTERFACE */
+
+void __init prom_init_memory(void)
+{
+        int i;
+        u32 node_id;
+        u32 mem_type;
+
+        /* parse memory information */
+        for (i = 0; i < loongson_memmap->nr_map; i++) {
+                node_id = loongson_memmap->map[i].node_id;
+                mem_type = loongson_memmap->map[i].mem_type;
+
+                if (node_id == 0) {
+                        switch (mem_type) {
+                        case SYSTEM_RAM_LOW:
+                                add_memory_region(loongson_memmap->map[i].mem_start,
+                                        (u64)loongson_memmap->map[i].mem_size << 20,
+                                        BOOT_MEM_RAM);
+                                break;
+                        case SYSTEM_RAM_HIGH:
+                                add_memory_region(loongson_memmap->map[i].mem_start,
+                                        (u64)loongson_memmap->map[i].mem_size << 20,
+                                        BOOT_MEM_RAM);
+                                break;
+                        case MEM_RESERVED:
+                                add_memory_region(loongson_memmap->map[i].mem_start,
+                                        (u64)loongson_memmap->map[i].mem_size << 20,
+                                        BOOT_MEM_RESERVED);
+                                break;
+                        }
+                }
+        }
+}
+
+#endif /* CONFIG_LEFI_FIRMWARE_INTERFACE */
+
 /* override of arch/mips/mm/cache.c: __uncached_access */
 int __uncached_access(struct file *file, unsigned long addr)
 {
diff --git a/arch/mips/loongson/common/pci.c b/arch/mips/loongson/common/pci.c
index fa7784459721..003ab4e618b3 100644
--- a/arch/mips/loongson/common/pci.c
+++ b/arch/mips/loongson/common/pci.c
@@ -11,6 +11,7 @@
 
 #include <pci.h>
 #include <loongson.h>
+#include <boot_param.h>
 
 static struct resource loongson_pci_mem_resource = {
         .name   = "pci memory space",
@@ -82,7 +83,10 @@ static int __init pcibios_init(void)
         setup_pcimap();
 
         loongson_pci_controller.io_map_base = mips_io_port_base;
-
+#ifdef CONFIG_LEFI_FIRMWARE_INTERFACE
+        loongson_pci_mem_resource.start = loongson_sysconf.pci_mem_start_addr;
+        loongson_pci_mem_resource.end = loongson_sysconf.pci_mem_end_addr;
+#endif
         register_pci_controller(&loongson_pci_controller);
 
         return 0;
diff --git a/arch/mips/loongson/common/reset.c b/arch/mips/loongson/common/reset.c
index 65bfbb5d06f4..a60715e11306 100644
--- a/arch/mips/loongson/common/reset.c
+++ b/arch/mips/loongson/common/reset.c
@@ -16,6 +16,7 @@
 #include <asm/reboot.h>
 
 #include <loongson.h>
+#include <boot_param.h>
 
 static inline void loongson_reboot(void)
 {
@@ -37,17 +38,37 @@ static inline void loongson_reboot(void)
 
 static void loongson_restart(char *command)
 {
+#ifndef CONFIG_LEFI_FIRMWARE_INTERFACE
         /* do preparation for reboot */
         mach_prepare_reboot();
 
         /* reboot via jumping to boot base address */
         loongson_reboot();
+#else
+        void (*fw_restart)(void) = (void *)loongson_sysconf.restart_addr;
+
+        fw_restart();
+        while (1) {
+                if (cpu_wait)
+                        cpu_wait();
+        }
+#endif
 }
 
 static void loongson_poweroff(void)
 {
+#ifndef CONFIG_LEFI_FIRMWARE_INTERFACE
         mach_prepare_shutdown();
         unreachable();
+#else
+        void (*fw_poweroff)(void) = (void *)loongson_sysconf.poweroff_addr;
+
+        fw_poweroff();
+        while (1) {
+                if (cpu_wait)
+                        cpu_wait();
+        }
+#endif
 }
 
 static void loongson_halt(void)