korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-11-18 01:34:14 +08:00
Code Issues Packages Projects Releases Wiki Activity

ARM: shmobile: rcar-gen2: Obtain extal frequency from DT

Browse Source 
On some R-Car Gen2 SoCs, the frequency of the ARM architecture timer
depends on the frequency of the external clock crystal.  Currently the
latter is determined indirectly from the state of the mode pins, which
is a relic predating DT.

Obtain the external clock crystal frequency from DT instead, removing
the dependency on the mode pins.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
This commit is contained in:
Geert Uytterhoeven 2016-06-13 12:29:37 +02:00 committed by Simon Horman
parent a57ac4c16b
commit 9f5ce39ddb
1 changed files with 22 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

42
arch/arm/mach-shmobile/setup-rcar-gen2.c
View File

@ -46,6 +46,26 @@ u32 rcar_gen2_read_mode_pins(void)
return mode;
}
static unsigned int __init get_extal_freq(void)
{
struct device_node *cpg, *extal;
u32 freq = 20000000;
cpg = of_find_compatible_node(NULL, NULL,
"renesas,rcar-gen2-cpg-clocks");
if (!cpg)
return freq;
extal = of_parse_phandle(cpg, "clocks", 0);
of_node_put(cpg);
if (!extal)
return freq;
of_property_read_u32(extal, "clock-frequency", &freq);
of_node_put(extal);
return freq;
}
#define CNTCR 0
#define CNTFID0 0x20
@ -54,7 +74,6 @@ void __init rcar_gen2_timer_init(void)
u32 mode = rcar_gen2_read_mode_pins();
#ifdef CONFIG_ARM_ARCH_TIMER
void __iomem *base;
int extal_mhz = 0;
u32 freq;
if (of_machine_is_compatible("renesas,r8a7794")) {
@ -82,26 +101,9 @@ void __init rcar_gen2_timer_init(void)
* with the counter disabled. Moreover, it may also report
* a potentially incorrect fixed 13 MHz frequency. To be
* correct these registers need to be updated to use the
* frequency EXTAL / 2 which can be determined by the MD pins.
* frequency EXTAL / 2.
*/
switch (mode & (MD(14) | MD(13))) {
case 0:
extal_mhz = 15;
break;
case MD(13):
extal_mhz = 20;
break;
case MD(14):
extal_mhz = 26;
break;
case MD(13) | MD(14):
extal_mhz = 30;
break;
}
/* The arch timer frequency equals EXTAL / 2 */
freq = extal_mhz * (1000000 / 2);
freq = get_extal_freq() / 2;
}
/* Remap "armgcnt address map" space */