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path: root/drivers/pwm/pwm-tiehrpwm.c
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Diffstat (limited to 'drivers/pwm/pwm-tiehrpwm.c')
-rw-r--r--drivers/pwm/pwm-tiehrpwm.c62
1 files changed, 61 insertions, 1 deletions
diff --git a/drivers/pwm/pwm-tiehrpwm.c b/drivers/pwm/pwm-tiehrpwm.c
index 9ffd389d0c8b..72a6dd40c9ec 100644
--- a/drivers/pwm/pwm-tiehrpwm.c
+++ b/drivers/pwm/pwm-tiehrpwm.c
@@ -25,6 +25,10 @@
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/pm_runtime.h>
+#include <linux/of_device.h>
+#include <linux/pinctrl/consumer.h>
+
+#include "pwm-tipwmss.h"
/* EHRPWM registers and bits definitions */
@@ -115,6 +119,7 @@ struct ehrpwm_pwm_chip {
void __iomem *mmio_base;
unsigned long period_cycles[NUM_PWM_CHANNEL];
enum pwm_polarity polarity[NUM_PWM_CHANNEL];
+ struct clk *tbclk;
};
static inline struct ehrpwm_pwm_chip *to_ehrpwm_pwm_chip(struct pwm_chip *chip)
@@ -335,6 +340,9 @@ static int ehrpwm_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
/* Channels polarity can be configured from action qualifier module */
configure_polarity(pc, pwm->hwpwm);
+ /* Enable TBCLK before enabling PWM device */
+ clk_enable(pc->tbclk);
+
/* Enable time counter for free_run */
ehrpwm_modify(pc->mmio_base, TBCTL, TBCTL_RUN_MASK, TBCTL_FREE_RUN);
return 0;
@@ -363,6 +371,9 @@ static void ehrpwm_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
ehrpwm_modify(pc->mmio_base, AQCSFRC, aqcsfrc_mask, aqcsfrc_val);
+ /* Disabling TBCLK on PWM disable */
+ clk_disable(pc->tbclk);
+
/* Stop Time base counter */
ehrpwm_modify(pc->mmio_base, TBCTL, TBCTL_RUN_MASK, TBCTL_STOP_NEXT);
@@ -392,12 +403,24 @@ static const struct pwm_ops ehrpwm_pwm_ops = {
.owner = THIS_MODULE,
};
+static const struct of_device_id ehrpwm_of_match[] = {
+ { .compatible = "ti,am33xx-ehrpwm" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, ehrpwm_of_match);
+
static int ehrpwm_pwm_probe(struct platform_device *pdev)
{
int ret;
struct resource *r;
struct clk *clk;
struct ehrpwm_pwm_chip *pc;
+ u16 status;
+ struct pinctrl *pinctrl;
+
+ pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
+ if (IS_ERR(pinctrl))
+ dev_warn(&pdev->dev, "unable to select pin group\n");
pc = devm_kzalloc(&pdev->dev, sizeof(*pc), GFP_KERNEL);
if (!pc) {
@@ -419,6 +442,8 @@ static int ehrpwm_pwm_probe(struct platform_device *pdev)
pc->chip.dev = &pdev->dev;
pc->chip.ops = &ehrpwm_pwm_ops;
+ pc->chip.of_xlate = of_pwm_xlate_with_flags;
+ pc->chip.of_pwm_n_cells = 3;
pc->chip.base = -1;
pc->chip.npwm = NUM_PWM_CHANNEL;
@@ -432,6 +457,13 @@ static int ehrpwm_pwm_probe(struct platform_device *pdev)
if (!pc->mmio_base)
return -EADDRNOTAVAIL;
+ /* Acquire tbclk for Time Base EHRPWM submodule */
+ pc->tbclk = devm_clk_get(&pdev->dev, "tbclk");
+ if (IS_ERR(pc->tbclk)) {
+ dev_err(&pdev->dev, "Failed to get tbclk\n");
+ return PTR_ERR(pc->tbclk);
+ }
+
ret = pwmchip_add(&pc->chip);
if (ret < 0) {
dev_err(&pdev->dev, "pwmchip_add() failed: %d\n", ret);
@@ -439,14 +471,40 @@ static int ehrpwm_pwm_probe(struct platform_device *pdev)
}
pm_runtime_enable(&pdev->dev);
+ pm_runtime_get_sync(&pdev->dev);
+
+ status = pwmss_submodule_state_change(pdev->dev.parent,
+ PWMSS_EPWMCLK_EN);
+ if (!(status & PWMSS_EPWMCLK_EN_ACK)) {
+ dev_err(&pdev->dev, "PWMSS config space clock enable failed\n");
+ ret = -EINVAL;
+ goto pwmss_clk_failure;
+ }
+
+ pm_runtime_put_sync(&pdev->dev);
+
platform_set_drvdata(pdev, pc);
return 0;
+
+pwmss_clk_failure:
+ pm_runtime_put_sync(&pdev->dev);
+ pm_runtime_disable(&pdev->dev);
+ pwmchip_remove(&pc->chip);
+ return ret;
}
static int ehrpwm_pwm_remove(struct platform_device *pdev)
{
struct ehrpwm_pwm_chip *pc = platform_get_drvdata(pdev);
+ pm_runtime_get_sync(&pdev->dev);
+ /*
+ * Due to hardware misbehaviour, acknowledge of the stop_req
+ * is missing. Hence checking of the status bit skipped.
+ */
+ pwmss_submodule_state_change(pdev->dev.parent, PWMSS_EPWMCLK_STOP_REQ);
+ pm_runtime_put_sync(&pdev->dev);
+
pm_runtime_put_sync(&pdev->dev);
pm_runtime_disable(&pdev->dev);
return pwmchip_remove(&pc->chip);
@@ -454,7 +512,9 @@ static int ehrpwm_pwm_remove(struct platform_device *pdev)
static struct platform_driver ehrpwm_pwm_driver = {
.driver = {
- .name = "ehrpwm",
+ .name = "ehrpwm",
+ .owner = THIS_MODULE,
+ .of_match_table = ehrpwm_of_match,
},
.probe = ehrpwm_pwm_probe,
.remove = ehrpwm_pwm_remove,