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authorMichal Simek <michal.simek@xilinx.com>2013-12-18 17:18:48 +0100
committerMichal Simek <michal.simek@xilinx.com>2014-01-27 11:24:55 +0100
commitc1120542b99a67a620cd8a298975d76dca5a13f0 (patch)
tree942aaf1e8d3d0c08a3cdbee5316f14dd4a901083 /arch/microblaze/kernel/cpu/cpuinfo.c
parent21ecc1f1d2e01ddbd75c3db208236628474a43e1 (diff)
microblaze: Add support for CCF
Add support for CCF for Microblaze. Old binding: system_timer: system-timer@41c00000 { clock-frequency = <75000000>; ... } New binding: system_timer: system-timer@41c00000 { clocks = <&clk_bus>; ... } Both should be supported for a while Microblaze clock binding: clocks { #address-cells = <1>; #size-cells = <0>; clk_bus: bus { #clock-cells = <0>; clock-frequency = <75000000>; clock-output-names = "bus"; compatible = "fixed-clock"; reg = <1>; } ; clk_cpu: cpu { #clock-cells = <0>; clock-frequency = <75000000>; clock-output-names = "cpu"; compatible = "fixed-clock"; reg = <0>; } ; } ; Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Diffstat (limited to 'arch/microblaze/kernel/cpu/cpuinfo.c')
-rw-r--r--arch/microblaze/kernel/cpu/cpuinfo.c23
1 files changed, 21 insertions, 2 deletions
diff --git a/arch/microblaze/kernel/cpu/cpuinfo.c b/arch/microblaze/kernel/cpu/cpuinfo.c
index c9203b1007aa..ce1cfed731ea 100644
--- a/arch/microblaze/kernel/cpu/cpuinfo.c
+++ b/arch/microblaze/kernel/cpu/cpuinfo.c
@@ -8,6 +8,7 @@
* for more details.
*/
+#include <linux/clk.h>
#include <linux/init.h>
#include <asm/cpuinfo.h>
#include <asm/pvr.h>
@@ -68,11 +69,10 @@ const struct family_string_key family_string_lookup[] = {
};
struct cpuinfo cpuinfo;
+static struct device_node *cpu;
void __init setup_cpuinfo(void)
{
- struct device_node *cpu = NULL;
-
cpu = (struct device_node *) of_find_node_by_type(NULL, "cpu");
if (!cpu)
pr_err("You don't have cpu!!!\n");
@@ -102,3 +102,22 @@ void __init setup_cpuinfo(void)
pr_warn("%s: Stream instructions enabled"
" - USERSPACE CAN LOCK THIS KERNEL!\n", __func__);
}
+
+void __init setup_cpuinfo_clk(void)
+{
+ struct clk *clk;
+
+ clk = of_clk_get(cpu, 0);
+ if (IS_ERR(clk)) {
+ pr_err("ERROR: CPU CCF input clock not found\n");
+ /* take timebase-frequency from DTS */
+ cpuinfo.cpu_clock_freq = fcpu(cpu, "timebase-frequency");
+ } else {
+ cpuinfo.cpu_clock_freq = clk_get_rate(clk);
+ }
+
+ if (!cpuinfo.cpu_clock_freq) {
+ pr_err("ERROR: CPU clock frequency not setup\n");
+ BUG();
+ }
+}