Re: [PATCH V16 04/12] MIPS: Loongson: Add UEFI-like firmware interface (LEFI) support

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Hi,

On 08/01/14 02:44, Huacai Chen wrote:
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@xxxxxxxxxx>
Signed-off-by: Hongliang Tao <taohl@xxxxxxxxxx>
Signed-off-by: Hua Yan <yanh@xxxxxxxxxx>
---
  arch/mips/include/asm/mach-loongson/boot_param.h |  159 ++++++++++++++++++++++
  arch/mips/include/asm/mach-loongson/loongson.h   |    4 +-
  arch/mips/loongson/common/env.c                  |   64 +++++++--
  arch/mips/loongson/common/init.c                 |    9 +-
  arch/mips/loongson/common/mem.c                  |   42 ++++++
  arch/mips/loongson/common/pci.c                  |    6 +-
  arch/mips/loongson/common/reset.c                |   21 +++
  7 files changed, 285 insertions(+), 20 deletions(-)
  create mode 100644 arch/mips/include/asm/mach-loongson/boot_param.h

diff --git a/arch/mips/include/asm/mach-loongson/boot_param.h b/arch/mips/include/asm/mach-loongson/boot_param.h
new file mode 100644
index 0000000..234c0eb
--- /dev/null
+++ b/arch/mips/include/asm/mach-loongson/boot_param.h
@@ -0,0 +1,159 @@
+#ifndef __ASM_MACH_LOONGSON_BOOT_PARAM_H_
+#define __ASM_MACH_LOONGSON_BOOT_PARAM_H_
+
+#define SYSTEM_RAM_LOW		1
+#define SYSTEM_RAM_HIGH		2
+#define MEM_RESERVED		3
+#define PCI_IO			4
+#define PCI_MEM			5
+#define LOONGSON_CFG_REG	6
+#define VIDEO_ROM		7
+#define ADAPTER_ROM		8
+#define ACPI_TABLE		9
+#define MAX_MEMORY_TYPE		10
+
+#define LOONGSON3_BOOT_MEM_MAP_MAX 128
+struct efi_memory_map_loongson {
+	u16 vers;	/* version of efi_memory_map */
+	u32 nr_map;	/* number of memory_maps */
+	u32 mem_freq;	/* memory frequence */
+	struct mem_map {
+		u32 node_id;	/* node_id which memory attached to */
+		u32 mem_type;	/* system memory, pci memory, pci io, etc. */
+		u64 mem_start;	/* memory map start address */
+		u32 mem_size;	/* each memory_map size, not the total size */
+	} map[LOONGSON3_BOOT_MEM_MAP_MAX];
+} __packed;
+
+enum loongson_cpu_type {
+	Loongson_2E = 0,
+	Loongson_2F = 1,
+	Loongson_3A = 2,
+	Loongson_3B = 3,
+	Loongson_1A = 4,
+	Loongson_1B = 5
+};
+
+/*
+ * Capability and feature descriptor structure for MIPS CPU
+ */
+struct efi_cpuinfo_loongson {
+	u16 vers;     /* version of efi_cpuinfo_loongson */
+	u32 processor_id; /* PRID, e.g. 6305, 6306 */
+	u32 cputype;  /* Loongson_3A/3B, etc. */
+	u32 total_node;   /* num of total numa nodes */
+	u32 cpu_startup_core_id; /* Core id */
+	u32 cpu_clock_freq; /* cpu_clock */
+	u32 nr_cpus;
+} __packed;
+
+struct system_loongson {
+	u16 vers;     /* version of system_loongson */
+	u32 ccnuma_smp; /* 0: no numa; 1: has numa */
+	u32 sing_double_channel; /* 1:single; 2:double */
+} __packed;
+
+struct irq_source_routing_table {
+	u16 vers;
+	u16 size;
+	u16 rtr_bus;
+	u16 rtr_devfn;
+	u32 vendor;
+	u32 device;
+	u32 PIC_type;   /* conform use HT or PCI to route to CPU-PIC */
+	u64 ht_int_bit; /* 3A: 1<<24; 3B: 1<<16 */
+	u64 ht_enable;  /* irqs used in this PIC */
+	u32 node_id;    /* node id: 0x0-0; 0x1-1; 0x10-2; 0x11-3 */
+	u64 pci_mem_start_addr;
+	u64 pci_mem_end_addr;
+	u64 pci_io_start_addr;
+	u64 pci_io_end_addr;
+	u64 pci_config_addr;
+} __packed;
+
+struct interface_info {
+	u16 vers; /* version of the specificition */
+	u16 size;
+	u8  flag;
+	char description[64];
+} __packed;
+
+#define MAX_RESOURCE_NUMBER 128
+struct resource_loongson {
+	u64 start; /* resource start address */
+	u64 end;   /* resource end address */
+	char name[64];
+	u32 flags;
+};
+
+struct archdev_data {};  /* arch specific additions */
+
+struct board_devices {
+	char name[64];    /* hold the device name */
+	u32 num_resources; /* number of device_resource */
+	/* for each device's resource */
+	struct resource_loongson resource[MAX_RESOURCE_NUMBER];
+	/* arch specific additions */
+	struct archdev_data archdata;
+};
+
+struct loongson_special_attribute {
+	u16 vers;     /* version of this special */
+	char special_name[64]; /* special_atribute_name */
+	u32 loongson_special_type; /* type of special device */
+	/* for each device's resource */
+	struct resource_loongson resource[MAX_RESOURCE_NUMBER];
+};
+
+struct loongson_params {
+	u64 memory_offset;	/* efi_memory_map_loongson struct offset */
+	u64 cpu_offset;		/* efi_cpuinfo_loongson struct offset */
+	u64 system_offset;	/* system_loongson struct offset */
+	u64 irq_offset;		/* irq_source_routing_table struct offset */
+	u64 interface_offset;	/* interface_info struct offset */
+	u64 special_offset;	/* loongson_special_attribute struct offset */
+	u64 boarddev_table_offset;  /* board_devices offset */
+};
+
+struct smbios_tables {
+	u16 vers;     /* version of smbios */
+	u64 vga_bios; /* vga_bios address */
+	struct loongson_params lp;
+};
+
+struct efi_reset_system_t {
+	u64 ResetCold;
+	u64 ResetWarm;
+	u64 ResetType;
+	u64 Shutdown;
+};
+
+struct efi_loongson {
+	u64 mps;	/* MPS table */
+	u64 acpi;	/* ACPI table (IA64 ext 0.71) */
+	u64 acpi20;	/* ACPI table (ACPI 2.0) */
+	struct smbios_tables smbios;	/* SM BIOS table */
+	u64 sal_systab;	/* SAL system table */
+	u64 boot_info;	/* boot info table */
+};
+
+struct boot_params {
+	struct efi_loongson efi;
+	struct efi_reset_system_t reset_system;
+};
+
+struct loongson_system_configuration {
+	u32 nr_cpus;
+	enum loongson_cpu_type cputype;
+	u64 ht_control_base;
+	u64 pci_mem_start_addr;
+	u64 pci_mem_end_addr;
+	u64 pci_io_base;
+	u64 restart_addr;
+	u64 poweroff_addr;
+	u64 vgabios_addr;
+};
+
+extern struct efi_memory_map_loongson *emap;
+extern struct loongson_system_configuration loongson_sysconf;
+#endif
diff --git a/arch/mips/include/asm/mach-loongson/loongson.h b/arch/mips/include/asm/mach-loongson/loongson.h
index b286534..5913ea0 100644
--- a/arch/mips/include/asm/mach-loongson/loongson.h
+++ b/arch/mips/include/asm/mach-loongson/loongson.h
@@ -24,8 +24,8 @@ extern void mach_prepare_reboot(void);
  extern void mach_prepare_shutdown(void);

  /* environment arguments from bootloader */
-extern unsigned long cpu_clock_freq;
-extern unsigned long memsize, highmemsize;
+extern u32 cpu_clock_freq;
+extern u32 memsize, highmemsize;

  /* loongson-specific command line, env and memory initialization */
  extern void __init prom_init_memory(void);
diff --git a/arch/mips/loongson/common/env.c b/arch/mips/loongson/common/env.c
index 0a18fcf..ba2b6df 100644
--- a/arch/mips/loongson/common/env.c
+++ b/arch/mips/loongson/common/env.c
@@ -18,29 +18,37 @@
   * option) any later version.
   */
  #include <linux/module.h>
-
  #include <asm/bootinfo.h>
-
  #include <loongson.h>
+#include <boot_param.h>
+
+struct boot_params *boot_p;
+struct loongson_params *loongson_p;
+
+struct efi_cpuinfo_loongson *ecpu;
+struct efi_memory_map_loongson *emap;
+struct system_loongson *esys;
+struct irq_source_routing_table *eirq_source;
+struct loongson_system_configuration loongson_sysconf;

Aside from emap and loongson_sysconf, there's no need for the rest of these to be globals, as far as I can see they aren't used outside prom_init_env(). Also, esys doesn't appear to be used at all.

Thanks,
Alex


-unsigned long cpu_clock_freq;
+u32 cpu_clock_freq;
  EXPORT_SYMBOL(cpu_clock_freq);
-unsigned long memsize, highmemsize;

  #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 +56,6 @@ 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 +64,38 @@ void __init prom_init_env(void)
  	}
  	if (memsize == 0)
  		memsize = 256;
-	if (bus_clock == 0)
-		bus_clock = 66000000;
+	pr_info("memsize=%ld, highmemsize=%ld\n", memsize, highmemsize);
+#else
+	/* 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);
+	emap = (struct efi_memory_map_loongson *)
+		((u64)loongson_p + loongson_p->memory_offset);
+	eirq_source = (struct irq_source_routing_table *)
+		((u64)loongson_p + loongson_p->irq_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.restart_addr = boot_p->reset_system.ResetWarm;
+	loongson_sysconf.poweroff_addr = boot_p->reset_system.Shutdown;
+
+	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 +105,13 @@ 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 ae7af1f..81ba3b4 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 8626a42..42b2431 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 < emap->nr_map; i++) {
+		node_id = emap->map[i].node_id;
+		mem_type = emap->map[i].mem_type;
+
+		if (node_id == 0) {
+			switch (mem_type) {
+			case SYSTEM_RAM_LOW:
+				add_memory_region(emap->map[i].mem_start,
+					(u64)emap->map[i].mem_size << 20,
+					BOOT_MEM_RAM);
+				break;
+			case SYSTEM_RAM_HIGH:
+				add_memory_region(emap->map[i].mem_start,
+					(u64)emap->map[i].mem_size << 20,
+					BOOT_MEM_RAM);
+				break;
+			case MEM_RESERVED:
+				add_memory_region(emap->map[i].mem_start,
+					(u64)emap->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 fa77844..003ab4e 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 65bfbb5..a60715e 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)




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