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ARC: [DeviceTree] Convert some Kconfig items to runtime values

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* mem size now runtime configured (prev CONFIG_ARC_PLAT_SDRAM_SIZE)
* core cpu clk runtime configured (prev CONFIG_ARC_PLAT_CLK)

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
Vineet Gupta
2013-01-18 15:12:20 +05:30
parent 999159a538
commit 450dd430bf
6 changed files with 37 additions and 17 deletions
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12
arch/arc/kernel/clk.c
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@@ -8,4 +8,14 @@
#include <asm/clk.h>
unsigned long core_freq = CONFIG_ARC_PLAT_CLK;
unsigned long core_freq = 800000000;
/*
* As of now we default to device-tree provided clock
* In future we can determine this in early boot
*/
int arc_set_core_freq(unsigned long freq)
{
core_freq = freq;
return 0;
}

13
arch/arc/kernel/devtree.c
View File

@@ -15,6 +15,7 @@
#include <linux/of.h>
#include <linux/of_fdt.h>
#include <asm/prom.h>
#include <asm/clk.h>
/* called from unflatten_device_tree() to bootstrap devicetree itself */
void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
@@ -34,7 +35,9 @@ int __init setup_machine_fdt(void *dt)
struct boot_param_header *devtree = dt;
unsigned long dt_root;
char *model, *compat;
void *clk;
char manufacturer[16];
unsigned long len;
/* check device tree validity */
if (be32_to_cpu(devtree->magic) != OF_DT_HEADER)
@@ -60,5 +63,15 @@ int __init setup_machine_fdt(void *dt)
/* Retrieve various information from the /chosen node */
of_scan_flat_dt(early_init_dt_scan_chosen, boot_command_line);
/* Initialize {size,address}-cells info */
of_scan_flat_dt(early_init_dt_scan_root, NULL);
/* Setup memory, calling early_init_dt_add_memory_arch */
of_scan_flat_dt(early_init_dt_scan_memory, NULL);
clk = of_get_flat_dt_prop(dt_root, "clock-frequency", &len);
if (clk)
arc_set_core_freq(of_read_ulong(clk, len/4));
return 0;
}