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authorNoam Camus <noamca@mellanox.com>2016-11-16 09:31:12 +0300
committerVineet Gupta <vgupta@synopsys.com>2016-11-30 22:54:25 +0300
commit0465fb495f9c9698de08ff103905008e5f38e8f1 (patch)
tree02ba9ebf43ce8e4140bd2d625f0817f71e2fe743 /drivers/clocksource/timer-nps.c
parent09dcd1958be42ea473fef24a2c02d975f520ea71 (diff)
downloadlinux-0465fb495f9c9698de08ff103905008e5f38e8f1.tar.xz
clocksource: update "fn" at CLOCKSOURCE_OF_DECLARE() of nps400 timer
nps_setup_clocksource() should take node as only argument as defined by typedef int (*of_init_fn_1_ret)(struct device_node *) Therefore need to replace: int __init nps_setup_clocksource(struct device_node *node, struct clk *clk) with int __init nps_setup_clocksource(struct device_node *node) This patch also serve as preparation for next patch which add support for clockevents to nps400. Specifically we add new function nps_get_timer_clk() to serve clocksource and later clockevent registration. Signed-off-by: Noam Camus <noamca@mellanox.com> Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Diffstat (limited to 'drivers/clocksource/timer-nps.c')
-rw-r--r--drivers/clocksource/timer-nps.c65
1 files changed, 39 insertions, 26 deletions
diff --git a/drivers/clocksource/timer-nps.c b/drivers/clocksource/timer-nps.c
index 70c149af8ee0..0c8e21f905d7 100644
--- a/drivers/clocksource/timer-nps.c
+++ b/drivers/clocksource/timer-nps.c
@@ -46,7 +46,35 @@
/* This array is per cluster of CPUs (Each NPS400 cluster got 256 CPUs) */
static void *nps_msu_reg_low_addr[NPS_CLUSTER_NUM] __read_mostly;
-static unsigned long nps_timer_rate;
+static int __init nps_get_timer_clk(struct device_node *node,
+ unsigned long *timer_freq,
+ struct clk **clk)
+{
+ int ret;
+
+ *clk = of_clk_get(node, 0);
+ if (IS_ERR(*clk)) {
+ pr_err("timer missing clk");
+ return PTR_ERR(*clk);
+ }
+
+ ret = clk_prepare_enable(*clk);
+ if (ret) {
+ pr_err("Couldn't enable parent clk\n");
+ clk_put(*clk);
+ return ret;
+ }
+
+ *timer_freq = clk_get_rate(*clk);
+ if (!(*timer_freq)) {
+ pr_err("Couldn't get clk rate\n");
+ clk_disable_unprepare(*clk);
+ clk_put(*clk);
+ return -EINVAL;
+ }
+
+ return 0;
+}
static cycle_t nps_clksrc_read(struct clocksource *clksrc)
{
@@ -55,26 +83,24 @@ static cycle_t nps_clksrc_read(struct clocksource *clksrc)
return (cycle_t)ioread32be(nps_msu_reg_low_addr[cluster]);
}
-static int __init nps_setup_clocksource(struct device_node *node,
- struct clk *clk)
+static int __init nps_setup_clocksource(struct device_node *node)
{
int ret, cluster;
+ struct clk *clk;
+ unsigned long nps_timer1_freq;
+
for (cluster = 0; cluster < NPS_CLUSTER_NUM; cluster++)
nps_msu_reg_low_addr[cluster] =
nps_host_reg((cluster << NPS_CLUSTER_OFFSET),
- NPS_MSU_BLKID, NPS_MSU_TICK_LOW);
+ NPS_MSU_BLKID, NPS_MSU_TICK_LOW);
- ret = clk_prepare_enable(clk);
- if (ret) {
- pr_err("Couldn't enable parent clock\n");
+ ret = nps_get_timer_clk(node, &nps_timer1_freq, &clk);
+ if (ret)
return ret;
- }
- nps_timer_rate = clk_get_rate(clk);
-
- ret = clocksource_mmio_init(nps_msu_reg_low_addr, "EZnps-tick",
- nps_timer_rate, 301, 32, nps_clksrc_read);
+ ret = clocksource_mmio_init(nps_msu_reg_low_addr, "nps-tick",
+ nps_timer1_freq, 300, 32, nps_clksrc_read);
if (ret) {
pr_err("Couldn't register clock source.\n");
clk_disable_unprepare(clk);
@@ -83,18 +109,5 @@ static int __init nps_setup_clocksource(struct device_node *node,
return ret;
}
-static int __init nps_timer_init(struct device_node *node)
-{
- struct clk *clk;
-
- clk = of_clk_get(node, 0);
- if (IS_ERR(clk)) {
- pr_err("Can't get timer clock.\n");
- return PTR_ERR(clk);
- }
-
- return nps_setup_clocksource(node, clk);
-}
-
CLOCKSOURCE_OF_DECLARE(ezchip_nps400_clksrc, "ezchip,nps400-timer",
- nps_timer_init);
+ nps_setup_clocksource);