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Commit 6291319d authored by Grant Likely's avatar Grant Likely
Browse files

arm/dt: consolidate atags setup into setup_machine_atags 



In preparation for adding device tree support, this patch consolidates
all of the atag-specific setup into a single function.

v5: - drop double printk("Machine; %s\n", ...); call.
    - leave copying boot_command_line in setup_arch() since it isn't
      atags specific.
v4: - adapt to the removal of lookup_machine_type()
    - break out dump of machine_desc table into dump_machine_table()
      because the device tree probe code will use it.
    - Add for_each_machine_desc() macro

Tested-by: default avatarTony Lindgren <tony@atomide.com>
Acked-by: default avatarNicolas Pitre <nicolas.pitre@linaro.org>
Acked-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: default avatarGrant Likely <grant.likely@secretlab.ca>
parent 9eb8f674

arch/arm/include/asm/mach/arch.h

+7 −0
Original line number Diff line number Diff line
@@ -47,6 +47,13 @@ struct machine_desc { 
 */

extern struct machine_desc *machine_desc;



/*

 * Machine type table - also only accessible during boot

 */

extern struct machine_desc __arch_info_begin[], __arch_info_end[];

#define for_each_machine_desc(p)			\

	for (p = __arch_info_begin; p < __arch_info_end; p++)



/*

 * Set of macros to define architecture features.  This is built into

 * a table by the linker.

arch/arm/kernel/setup.c

+40 −29
Original line number Diff line number Diff line
@@ -439,25 +439,12 @@ void cpu_init(void) 
	    : "r14");

}



static struct machine_desc * __init setup_machine(unsigned int nr)

static void __init dump_machine_table(void)

{

	extern struct machine_desc __arch_info_begin[], __arch_info_end[];

	struct machine_desc *p;



	/*

	 * locate machine in the list of supported machines.

	 */

	for (p = __arch_info_begin; p < __arch_info_end; p++)

		if (nr == p->nr) {

			printk("Machine: %s\n", p->name);

			return p;

		}



	early_print("\n"

		"Error: unrecognized/unsupported machine ID (r1 = 0x%08x).\n\n"

		"Available machine support:\n\nID (hex)\tNAME\n", nr);



	for (p = __arch_info_begin; p < __arch_info_end; p++)

	early_print("Available machine support:\n\nID (hex)\tNAME\n");

	for_each_machine_desc(p)

		early_print("%08x\t%s\n", p->nr, p->name);



	early_print("\nPlease check your kernel config and/or bootloader.\n");
@@ -796,23 +783,29 @@ static void __init squash_mem_tags(struct tag *tag) 
			tag->hdr.tag = ATAG_NONE;

}



void __init setup_arch(char **cmdline_p)

static struct machine_desc * __init setup_machine_tags(unsigned int nr)

{

	struct tag *tags = (struct tag *)&init_tags;

	struct machine_desc *mdesc;

	struct machine_desc *mdesc = NULL, *p;

	char *from = default_command_line;



	init_tags.mem.start = PHYS_OFFSET;



	unwind_init();



	setup_processor();

	mdesc = setup_machine(machine_arch_type);

	machine_desc = mdesc;

	machine_name = mdesc->name;

	/*

	 * locate machine in the list of supported machines.

	 */

	for_each_machine_desc(p)

		if (nr == p->nr) {

			printk("Machine: %s\n", p->name);

			mdesc = p;

			break;

		}



	if (mdesc->soft_reboot)

		reboot_setup("s");

	if (!mdesc) {

		early_print("\nError: unrecognized/unsupported machine ID"

			" (r1 = 0x%08x).\n\n", nr);

		dump_machine_table(); /* does not return */

	}



	if (__atags_pointer)

		tags = phys_to_virt(__atags_pointer);
@@ -857,14 +850,32 @@ void __init setup_arch(char **cmdline_p) 
		parse_tags(tags);

	}



	/* parse_early_param needs a boot_command_line */

	strlcpy(boot_command_line, from, COMMAND_LINE_SIZE);



	return mdesc;

}





void __init setup_arch(char **cmdline_p)

{

	struct machine_desc *mdesc;



	unwind_init();



	setup_processor();

	mdesc = setup_machine_tags(machine_arch_type);

	machine_desc = mdesc;

	machine_name = mdesc->name;



	if (mdesc->soft_reboot)

		reboot_setup("s");



	init_mm.start_code = (unsigned long) _text;

	init_mm.end_code   = (unsigned long) _etext;

	init_mm.end_data   = (unsigned long) _edata;

	init_mm.brk	   = (unsigned long) _end;



	/* parse_early_param needs a boot_command_line */

	strlcpy(boot_command_line, from, COMMAND_LINE_SIZE);



	/* populate cmd_line too for later use, preserving boot_command_line */

	strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE);

	*cmdline_p = cmd_line;