The clock name should be ipg instead of igp.
Signed-off-by: Anson Huang <[email protected]>
---
Documentation/devicetree/bindings/timer/nxp,tpm-timer.txt | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/Documentation/devicetree/bindings/timer/nxp,tpm-timer.txt b/Documentation/devicetree/bindings/timer/nxp,tpm-timer.txt
index b4aa7dd..f82087b 100644
--- a/Documentation/devicetree/bindings/timer/nxp,tpm-timer.txt
+++ b/Documentation/devicetree/bindings/timer/nxp,tpm-timer.txt
@@ -15,7 +15,7 @@ Required properties:
- interrupts : Should be the clock event device interrupt.
- clocks : The clocks provided by the SoC to drive the timer, must contain
an entry for each entry in clock-names.
-- clock-names : Must include the following entries: "igp" and "per".
+- clock-names : Must include the following entries: "ipg" and "per".
Example:
tpm5: tpm@40260000 {
--
2.7.4
Different TPM modules have different width counters which
is 16-bit or 32-bit, the counter width can be read from
TPM_PARAM register bit[23:16], this patch adds dynamic
check for counter width to support both 16-bit and 32-bit
TPM modules.
Signed-off-by: Anson Huang <[email protected]>
---
changes since V1:
use largest prescaler for 16-bit counter;
use lower rating for 16-bit counter than 32-bit;
remove the computing in counter read function.
drivers/clocksource/timer-imx-tpm.c | 33 +++++++++++++++++++++++++--------
1 file changed, 25 insertions(+), 8 deletions(-)
diff --git a/drivers/clocksource/timer-imx-tpm.c b/drivers/clocksource/timer-imx-tpm.c
index 7403e49..05d97a6 100644
--- a/drivers/clocksource/timer-imx-tpm.c
+++ b/drivers/clocksource/timer-imx-tpm.c
@@ -17,9 +17,13 @@
#include <linux/of_irq.h>
#include <linux/sched_clock.h>
+#define TPM_PARAM 0x4
+#define TPM_PARAM_WIDTH_SHIFT 16
+#define TPM_PARAM_WIDTH_MASK (0xff << 16)
#define TPM_SC 0x10
#define TPM_SC_CMOD_INC_PER_CNT (0x1 << 3)
#define TPM_SC_CMOD_DIV_DEFAULT 0x3
+#define TPM_SC_CMOD_DIV_MAX 0x7
#define TPM_SC_TOF_MASK (0x1 << 7)
#define TPM_CNT 0x14
#define TPM_MOD 0x18
@@ -33,6 +37,8 @@
#define TPM_C0SC_CHF_MASK (0x1 << 7)
#define TPM_C0V 0x24
+static int counter_width;
+static int rating;
static void __iomem *timer_base;
static struct clock_event_device clockevent_tpm;
@@ -85,10 +91,11 @@ static int __init tpm_clocksource_init(unsigned long rate)
tpm_delay_timer.freq = rate;
register_current_timer_delay(&tpm_delay_timer);
- sched_clock_register(tpm_read_sched_clock, 32, rate);
+ sched_clock_register(tpm_read_sched_clock, counter_width, rate);
return clocksource_mmio_init(timer_base + TPM_CNT, "imx-tpm",
- rate, 200, 32, clocksource_mmio_readl_up);
+ rate, rating, counter_width,
+ clocksource_mmio_readl_up);
}
static int tpm_set_next_event(unsigned long delta,
@@ -141,7 +148,6 @@ static struct clock_event_device clockevent_tpm = {
.set_state_oneshot = tpm_set_state_oneshot,
.set_next_event = tpm_set_next_event,
.set_state_shutdown = tpm_set_state_shutdown,
- .rating = 200,
};
static int __init tpm_clockevent_init(unsigned long rate, int irq)
@@ -151,10 +157,11 @@ static int __init tpm_clockevent_init(unsigned long rate, int irq)
ret = request_irq(irq, tpm_timer_interrupt, IRQF_TIMER | IRQF_IRQPOLL,
"i.MX7ULP TPM Timer", &clockevent_tpm);
+ clockevent_tpm.rating = rating;
clockevent_tpm.cpumask = cpumask_of(0);
clockevent_tpm.irq = irq;
- clockevents_config_and_register(&clockevent_tpm,
- rate, 300, 0xfffffffe);
+ clockevents_config_and_register(&clockevent_tpm, rate, 300,
+ GENMASK(counter_width - 1, 1));
return ret;
}
@@ -199,6 +206,11 @@ static int __init tpm_timer_init(struct device_node *np)
goto err_per_clk_enable;
}
+ counter_width = (readl(timer_base + TPM_PARAM) & TPM_PARAM_WIDTH_MASK)
+ >> TPM_PARAM_WIDTH_SHIFT;
+ /* use rating 200 for 32-bit counter and 150 for 16-bit counter */
+ rating = counter_width == 0x20 ? 200 : 150;
+
/*
* Initialize tpm module to a known state
* 1) Counter disabled
@@ -215,12 +227,17 @@ static int __init tpm_timer_init(struct device_node *np)
/* 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,
+ /*
+ * increase per cnt,
+ * div 8 for 32-bit counter and div 128 for 16-bit counter
+ */
+ writel(TPM_SC_CMOD_INC_PER_CNT |
+ (counter_width == 0x20 ?
+ TPM_SC_CMOD_DIV_DEFAULT : TPM_SC_CMOD_DIV_MAX),
timer_base + TPM_SC);
/* set MOD register to maximum for free running mode */
- writel(0xffffffff, timer_base + TPM_MOD);
+ writel(GENMASK(counter_width - 1, 0), timer_base + TPM_MOD);
rate = clk_get_rate(per) >> 3;
ret = tpm_clocksource_init(rate);
--
2.7.4
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 <[email protected]>
---
changes since V1:
use separate patch to fix the clock name typo.
drivers/clocksource/timer-imx-tpm.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/drivers/clocksource/timer-imx-tpm.c b/drivers/clocksource/timer-imx-tpm.c
index 3f97d49..7403e49 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,
--
2.7.4
The clock name should be ipg instead of igp.
Signed-off-by: Anson Huang <[email protected]>
---
drivers/clocksource/timer-imx-tpm.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/clocksource/timer-imx-tpm.c b/drivers/clocksource/timer-imx-tpm.c
index 21bffdc..3f97d49 100644
--- a/drivers/clocksource/timer-imx-tpm.c
+++ b/drivers/clocksource/timer-imx-tpm.c
@@ -179,7 +179,7 @@ static int __init tpm_timer_init(struct device_node *np)
ipg = of_clk_get_by_name(np, "ipg");
per = of_clk_get_by_name(np, "per");
if (IS_ERR(ipg) || IS_ERR(per)) {
- pr_err("tpm: failed to get igp or per clk\n");
+ pr_err("tpm: failed to get ipg or per clk\n");
ret = -ENODEV;
goto err_clk_get;
}
--
2.7.4
On Tue, Mar 27, 2018 at 10:22 PM, Anson Huang <[email protected]> wrote:
> The clock name should be ipg instead of igp.
>
> Signed-off-by: Anson Huang <[email protected]>
> ---
> Documentation/devicetree/bindings/timer/nxp,tpm-timer.txt | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
Reviewed-by: Rob Herring <[email protected]>