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authorSimon Horman <horms+renesas@verge.net.au>2014-05-13 02:59:18 -0400
committerSimon Horman <horms+renesas@verge.net.au>2014-05-14 01:02:21 -0400
commitf492b81777c93b33afe892b424e022022b5bc297 (patch)
tree1e7596767eddec8b733f4002233dfc3f01be92cb
parent34b9fa401eeef4e388bb7563110733c73c452c80 (diff)
ARM: shmobile: Set clock frequency in HZ from OF nodes
shmobile_init_delay() looks for OF "clock-frequency" to determine the delay which is set by calling shmobile_setup_delay(). Unfortunately this seems to be incorrect in detail as "clock-frequency" node values are in HZ whereas the frequency argument to shmobile_setup_delay() is in MHz. Provide a variant of shmobile_setup_delay() that accepts HZ to correct this problem. Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
-rw-r--r--arch/arm/mach-shmobile/timer.c23
1 files changed, 20 insertions, 3 deletions
diff --git a/arch/arm/mach-shmobile/timer.c b/arch/arm/mach-shmobile/timer.c
index ccecde9a3362..68bc0b82226d 100644
--- a/arch/arm/mach-shmobile/timer.c
+++ b/arch/arm/mach-shmobile/timer.c
@@ -23,6 +23,23 @@
23#include <linux/delay.h> 23#include <linux/delay.h>
24#include <linux/of_address.h> 24#include <linux/of_address.h>
25 25
26void __init shmobile_setup_delay_hz(unsigned int max_cpu_core_hz,
27 unsigned int mult, unsigned int div)
28{
29 /* calculate a worst-case loops-per-jiffy value
30 * based on maximum cpu core hz setting and the
31 * __delay() implementation in arch/arm/lib/delay.S
32 *
33 * this will result in a longer delay than expected
34 * when the cpu core runs on lower frequencies.
35 */
36
37 unsigned int value = HZ * div / mult;
38
39 if (!preset_lpj)
40 preset_lpj = max_cpu_core_hz / value;
41}
42
26void __init shmobile_setup_delay(unsigned int max_cpu_core_mhz, 43void __init shmobile_setup_delay(unsigned int max_cpu_core_mhz,
27 unsigned int mult, unsigned int div) 44 unsigned int mult, unsigned int div)
28{ 45{
@@ -58,12 +75,12 @@ void __init shmobile_init_delay(void)
58 75
59 if (max_freq) { 76 if (max_freq) {
60 if (of_find_compatible_node(NULL, NULL, "arm,cortex-a8")) 77 if (of_find_compatible_node(NULL, NULL, "arm,cortex-a8"))
61 shmobile_setup_delay(max_freq, 1, 3); 78 shmobile_setup_delay_hz(max_freq, 1, 3);
62 else if (of_find_compatible_node(NULL, NULL, "arm,cortex-a9")) 79 else if (of_find_compatible_node(NULL, NULL, "arm,cortex-a9"))
63 shmobile_setup_delay(max_freq, 1, 3); 80 shmobile_setup_delay_hz(max_freq, 1, 3);
64 else if (of_find_compatible_node(NULL, NULL, "arm,cortex-a15")) 81 else if (of_find_compatible_node(NULL, NULL, "arm,cortex-a15"))
65 if (!IS_ENABLED(CONFIG_ARM_ARCH_TIMER)) 82 if (!IS_ENABLED(CONFIG_ARM_ARCH_TIMER))
66 shmobile_setup_delay(max_freq, 2, 4); 83 shmobile_setup_delay_hz(max_freq, 2, 4);
67 } 84 }
68} 85}
69 86