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authorAnson Huang <Anson.Huang@nxp.com>2018-03-28 06:22:37 +0300
committerDaniel Lezcano <daniel.lezcano@linaro.org>2018-03-30 23:44:11 +0300
commit506a7be93ff773d5d4cf75a59f342865605b4910 (patch)
tree2cac7976917c504c5d7536202771e8e9786e797f /drivers/clocksource
parent16328e7bd428937f557a984d8b3378387c17a930 (diff)
downloadlinux-506a7be93ff773d5d4cf75a59f342865605b4910.tar.xz
clocksource/drivers/imx-tpm: Correct some registers operation flow
According to i.MX7ULP reference manual, TPM_SC_CPWMS can ONLY be written when counter is disabled, TPM_SC_TOF is write-1-clear, TPM_C0SC_CHF is also write-1-clear, correct these registers initialization flow; Signed-off-by: Anson Huang <Anson.Huang@nxp.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Diffstat (limited to 'drivers/clocksource')
-rw-r--r--drivers/clocksource/timer-imx-tpm.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/clocksource/timer-imx-tpm.c b/drivers/clocksource/timer-imx-tpm.c
index 3f97d4985824..7403e494417a 100644
--- a/drivers/clocksource/timer-imx-tpm.c
+++ b/drivers/clocksource/timer-imx-tpm.c
@@ -20,6 +20,7 @@
#define TPM_SC 0x10
#define TPM_SC_CMOD_INC_PER_CNT (0x1 << 3)
#define TPM_SC_CMOD_DIV_DEFAULT 0x3
+#define TPM_SC_TOF_MASK (0x1 << 7)
#define TPM_CNT 0x14
#define TPM_MOD 0x18
#define TPM_STATUS 0x1c
@@ -29,6 +30,7 @@
#define TPM_C0SC_MODE_SHIFT 2
#define TPM_C0SC_MODE_MASK 0x3c
#define TPM_C0SC_MODE_SW_COMPARE 0x4
+#define TPM_C0SC_CHF_MASK (0x1 << 7)
#define TPM_C0V 0x24
static void __iomem *timer_base;
@@ -205,9 +207,13 @@ static int __init tpm_timer_init(struct device_node *np)
* 4) Channel0 disabled
* 5) DMA transfers disabled
*/
+ /* make sure counter is disabled */
writel(0, timer_base + TPM_SC);
+ /* TOF is W1C */
+ writel(TPM_SC_TOF_MASK, timer_base + TPM_SC);
writel(0, timer_base + TPM_CNT);
- writel(0, timer_base + TPM_C0SC);
+ /* CHF is W1C */
+ writel(TPM_C0SC_CHF_MASK, timer_base + TPM_C0SC);
/* increase per cnt, div 8 by default */
writel(TPM_SC_CMOD_INC_PER_CNT | TPM_SC_CMOD_DIV_DEFAULT,