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path: root/drivers/clocksource/timer-imx-tpm.c
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2018-12-18clocksource/drivers/timer-imx-tpm: Specify clock name for timer-ofAnson Huang
i.MX TPM needs "ipg" clock for register access and "per" clock for timer function, the driver gets "ipg" clock by searching the clock name, but timer-of initialization will get first clock in device tree TPM node since no clock name specified in of_clk, that means the "per" clock MUST be the first clock entry in device tree TPM node, this patch specifies clock name for of_clk to avoid this restriction, it makes TPM driver work properly with different sequence of clock entries in device tree TPM node. Signed-off-by: Anson Huang <Anson.Huang@nxp.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2018-12-18clocksource/drivers/timer-imx-tpm: Convert the driver to timer-ofAnson Huang
Convert the driver to use the timer_of helpers. This allows to handle timer base, clock and irq using common timer_of driver and it simplifies the code. Signed-off-by: Anson Huang <Anson.Huang@nxp.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2018-05-23clocksource/drivers/timer-imx-tpm: Switch to SPDX identifierFabio Estevam
Adopt the SPDX license identifier headers to ease license compliance management. Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2018-04-19clocksource/imx-tpm: Correct -ETIME return condition checkAnson Huang
The additional brakects added to tpm_set_next_event's return value computation causes (int) forced type conversion NOT taking effect, and the incorrect value return will cause various system timer issue, like RCU stall etc.. Remove the additional brackets to make sure tpm_set_next_event always returns correct value. Fixes: 059ab7b82eec ("clocksource/drivers/imx-tpm: Add imx tpm timer support") Signed-off-by: Anson Huang <Anson.Huang@nxp.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Dong Aisheng <Aisheng.dong@nxp.com> Cc: stable@vger.kernel.org Cc: daniel.lezcano@linaro.org Cc: Linux-imx@nxp.com Link: https://lkml.kernel.org/r/1524117883-2484-1-git-send-email-Anson.Huang@nxp.com
2018-03-30clocksource/drivers/imx-tpm: Add different counter width supportAnson Huang
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 <Anson.Huang@nxp.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2018-03-30clocksource/drivers/imx-tpm: Correct some registers operation flowAnson Huang
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>
2018-03-30clocksource/drivers/imx-tpm: Fix typo of clock nameAnson Huang
The clock name should be ipg instead of igp. Signed-off-by: Anson Huang <Anson.Huang@nxp.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2017-08-29clocksource/drivers/imx-tpm: Add imx tpm timer supportDong Aisheng
IMX Timer/PWM Module (TPM) supports both timer and pwm function while this patch only adds the timer support. PWM would be added later. The TPM counter, compare and capture registers are clocked by an asynchronous clock that can remain enabled in low power modes. NOTE: We observed in a very small probability, the bus fabric contention between GPU and A7 may results a few cycles delay of writing CNT registers which may cause the min_delta event got missed, so we need add a ETIME check here in case it happened. Cc: Daniel Lezcano <daniel.lezcano@linaro.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Shawn Guo <shawnguo@kernel.org> Cc: Anson Huang <Anson.Huang@nxp.com> Cc: Bai Ping <ping.bai@nxp.com> Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>