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MIPS: ath79: Add basic device tree support 

Add the bare minimum to load a device tree.

Signed-off-by: Alban Bedel <albeu@free.fr>
Cc: linux-mips@linux-mips.org
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Alban Bedel 2015-05-31 01:52:25 +02:00 committed by Ralf Baechle
parent fe41b466f9
commit 03c8c407a8
3 changed files with 28 additions and 1 deletions
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1
arch/mips/Kconfig
View File

@ -134,6 +134,7 @@ config ATH79
select SYS_SUPPORTS_BIG_ENDIAN
select SYS_SUPPORTS_MIPS16
select SYS_SUPPORTS_ZBOOT
select USE_OF
help
Support for the Atheros AR71XX/AR724X/AR913X SoCs.

1
arch/mips/ath79/machtypes.h
View File

@ -15,6 +15,7 @@
#include <asm/mips_machine.h>
enum ath79_mach_type {
ATH79_MACH_GENERIC_OF = -1, /* Device tree board */
ATH79_MACH_GENERIC = 0,
ATH79_MACH_AP121, /* Atheros AP121 reference board */
ATH79_MACH_AP136_010, /* Atheros AP136-010 reference board */

27
arch/mips/ath79/setup.c
View File

@ -17,12 +17,16 @@
#include <linux/bootmem.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/of_platform.h>
#include <linux/of_fdt.h>
#include <asm/bootinfo.h>
#include <asm/idle.h>
#include <asm/time.h> /* for mips_hpt_frequency */
#include <asm/reboot.h> /* for _machine_{restart,halt} */
#include <asm/mips_machine.h>
#include <asm/prom.h>
#include <asm/fw/fw.h>
#include <asm/mach-ath79/ath79.h>
#include <asm/mach-ath79/ar71xx_regs.h>
@ -194,8 +198,19 @@ unsigned int get_c0_compare_int(void)
void __init plat_mem_setup(void)
{
unsigned long fdt_start;
set_io_port_base(KSEG1);
/* Get the position of the FDT passed by the bootloader */
fdt_start = fw_getenvl("fdt_start");
if (fdt_start)
__dt_setup_arch((void *)KSEG0ADDR(fdt_start));
#ifdef CONFIG_BUILTIN_DTB
else
__dt_setup_arch(__dtb_start);
#endif
ath79_reset_base = ioremap_nocache(AR71XX_RESET_BASE,
AR71XX_RESET_SIZE);
ath79_pll_base = ioremap_nocache(AR71XX_PLL_BASE,
@ -203,7 +218,8 @@ void __init plat_mem_setup(void)
ath79_ddr_ctrl_init();
ath79_detect_sys_type();
detect_memory_region(0, ATH79_MEM_SIZE_MIN, ATH79_MEM_SIZE_MAX);
if (mips_machtype != ATH79_MACH_GENERIC_OF)
detect_memory_region(0, ATH79_MEM_SIZE_MIN, ATH79_MEM_SIZE_MAX);
_machine_restart = ath79_restart;
_machine_halt = ath79_halt;
@ -235,6 +251,10 @@ void __init plat_time_init(void)
static int __init ath79_setup(void)
{
of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
if (mips_machtype == ATH79_MACH_GENERIC_OF)
return 0;
ath79_gpio_init();
ath79_register_uart();
ath79_register_wdt();
@ -246,6 +266,11 @@ static int __init ath79_setup(void)
arch_initcall(ath79_setup);
void __init device_tree_init(void)
{
unflatten_and_copy_device_tree();
}
static void __init ath79_generic_init(void)
{
/* Nothing to do */