Add programming sequence support for managing the Agera PLLs.
Signed-off-by: Taniya Das <[email protected]>
---
drivers/clk/qcom/clk-alpha-pll.c | 80 ++++++++++++++++++++++++++++++++++++++++
drivers/clk/qcom/clk-alpha-pll.h | 4 ++
2 files changed, 84 insertions(+)
diff --git a/drivers/clk/qcom/clk-alpha-pll.c b/drivers/clk/qcom/clk-alpha-pll.c
index 26139ef..17e1fc0 100644
--- a/drivers/clk/qcom/clk-alpha-pll.c
+++ b/drivers/clk/qcom/clk-alpha-pll.c
@@ -116,6 +116,16 @@ const u8 clk_alpha_pll_regs[][PLL_OFF_MAX_REGS] = {
[PLL_OFF_OPMODE] = 0x38,
[PLL_OFF_ALPHA_VAL] = 0x40,
},
+ [CLK_ALPHA_PLL_TYPE_AGERA] = {
+ [PLL_OFF_L_VAL] = 0x04,
+ [PLL_OFF_ALPHA_VAL] = 0x08,
+ [PLL_OFF_USER_CTL] = 0x0c,
+ [PLL_OFF_CONFIG_CTL] = 0x10,
+ [PLL_OFF_CONFIG_CTL_U] = 0x14,
+ [PLL_OFF_TEST_CTL] = 0x18,
+ [PLL_OFF_TEST_CTL_U] = 0x1c,
+ [PLL_OFF_STATUS] = 0x2c,
+ },
};
EXPORT_SYMBOL_GPL(clk_alpha_pll_regs);
@@ -1561,3 +1571,73 @@ const struct clk_ops clk_alpha_pll_postdiv_lucid_ops = {
.set_rate = clk_alpha_pll_postdiv_fabia_set_rate,
};
EXPORT_SYMBOL_GPL(clk_alpha_pll_postdiv_lucid_ops);
+
+void clk_agera_pll_configure(struct clk_alpha_pll *pll, struct regmap *regmap,
+ const struct alpha_pll_config *config)
+{
+ if (config->l)
+ regmap_write(regmap, PLL_L_VAL(pll), config->l);
+
+ if (config->alpha)
+ regmap_write(regmap, PLL_ALPHA_VAL(pll), config->alpha);
+
+ if (config->user_ctl_val)
+ regmap_write(regmap, PLL_USER_CTL(pll), config->user_ctl_val);
+
+ if (config->config_ctl_val)
+ regmap_write(regmap, PLL_CONFIG_CTL(pll),
+ config->config_ctl_val);
+
+ if (config->config_ctl_hi_val)
+ regmap_write(regmap, PLL_CONFIG_CTL_U(pll),
+ config->config_ctl_hi_val);
+
+ if (config->test_ctl_val)
+ regmap_write(regmap, PLL_TEST_CTL(pll),
+ config->test_ctl_val);
+
+ if (config->test_ctl_hi_val)
+ regmap_write(regmap, PLL_TEST_CTL_U(pll),
+ config->test_ctl_hi_val);
+}
+EXPORT_SYMBOL_GPL(clk_agera_pll_configure);
+
+static int clk_alpha_pll_agera_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long prate)
+{
+ struct clk_alpha_pll *pll = to_clk_alpha_pll(hw);
+ u32 l, alpha_width = pll_alpha_width(pll);
+ unsigned long rrate, max = rate + PLL_RATE_MARGIN;
+ u64 a;
+
+ rrate = alpha_pll_round_rate(rate, prate, &l, &a, alpha_width);
+
+ /*
+ * Due to limited number of bits for fractional rate programming, the
+ * rounded up rate could be marginally higher than the requested rate.
+ */
+ if (rrate > (rate + PLL_RATE_MARGIN) || rrate < rate) {
+ pr_err("%s: Rounded rate %lu not within range [%lu, %lu)\n",
+ clk_hw_get_name(hw), rrate, rate, max);
+ return -EINVAL;
+ }
+
+ /* change L_VAL without having to go through the power on sequence */
+ regmap_write(pll->clkr.regmap, PLL_L_VAL(pll), l);
+ regmap_write(pll->clkr.regmap, PLL_ALPHA_VAL(pll), a);
+
+ if (clk_hw_is_enabled(hw))
+ return wait_for_pll_enable_lock(pll);
+
+ return 0;
+}
+
+const struct clk_ops clk_alpha_pll_agera_ops = {
+ .enable = clk_alpha_pll_enable,
+ .disable = clk_alpha_pll_disable,
+ .is_enabled = clk_alpha_pll_is_enabled,
+ .recalc_rate = alpha_pll_fabia_recalc_rate,
+ .round_rate = clk_alpha_pll_round_rate,
+ .set_rate = clk_alpha_pll_agera_set_rate,
+};
+EXPORT_SYMBOL_GPL(clk_alpha_pll_agera_ops);
diff --git a/drivers/clk/qcom/clk-alpha-pll.h b/drivers/clk/qcom/clk-alpha-pll.h
index d3201b8..0ea30d2 100644
--- a/drivers/clk/qcom/clk-alpha-pll.h
+++ b/drivers/clk/qcom/clk-alpha-pll.h
@@ -15,6 +15,7 @@ enum {
CLK_ALPHA_PLL_TYPE_FABIA,
CLK_ALPHA_PLL_TYPE_TRION,
CLK_ALPHA_PLL_TYPE_LUCID = CLK_ALPHA_PLL_TYPE_TRION,
+ CLK_ALPHA_PLL_TYPE_AGERA,
CLK_ALPHA_PLL_TYPE_MAX,
};
@@ -141,6 +142,7 @@ extern const struct clk_ops clk_alpha_pll_postdiv_trion_ops;
extern const struct clk_ops clk_alpha_pll_lucid_ops;
#define clk_alpha_pll_fixed_lucid_ops clk_alpha_pll_fixed_trion_ops
extern const struct clk_ops clk_alpha_pll_postdiv_lucid_ops;
+extern const struct clk_ops clk_alpha_pll_agera_ops;
void clk_alpha_pll_configure(struct clk_alpha_pll *pll, struct regmap *regmap,
const struct alpha_pll_config *config);
@@ -148,6 +150,8 @@ void clk_fabia_pll_configure(struct clk_alpha_pll *pll, struct regmap *regmap,
const struct alpha_pll_config *config);
void clk_trion_pll_configure(struct clk_alpha_pll *pll, struct regmap *regmap,
const struct alpha_pll_config *config);
+void clk_agera_pll_configure(struct clk_alpha_pll *pll, struct regmap *regmap,
+ const struct alpha_pll_config *config);
#define clk_lucid_pll_configure(pll, regmap, config) \
clk_trion_pll_configure(pll, regmap, config)
--
Qualcomm INDIA, on behalf of Qualcomm Innovation Center, Inc.is a member
of the Code Aurora Forum, hosted by the Linux Foundation.
Quoting Taniya Das (2020-10-13 10:11:48)
> diff --git a/drivers/clk/qcom/clk-alpha-pll.c b/drivers/clk/qcom/clk-alpha-pll.c
> index 26139ef..17e1fc0 100644
> --- a/drivers/clk/qcom/clk-alpha-pll.c
> +++ b/drivers/clk/qcom/clk-alpha-pll.c
> @@ -1561,3 +1571,73 @@ const struct clk_ops clk_alpha_pll_postdiv_lucid_ops = {
> .set_rate = clk_alpha_pll_postdiv_fabia_set_rate,
> };
> EXPORT_SYMBOL_GPL(clk_alpha_pll_postdiv_lucid_ops);
> +
> +void clk_agera_pll_configure(struct clk_alpha_pll *pll, struct regmap *regmap,
> + const struct alpha_pll_config *config)
> +{
> + if (config->l)
> + regmap_write(regmap, PLL_L_VAL(pll), config->l);
Maybe make a helper function for this too. That way we can't mix up the
if condition with the value in the write.
clk_alpha_pll_write_config(regmap, PLL_L_VAL(pll), config->l);
static void clk_alpha_pll_write_config(struct regmap *regmap,
unsigned int reg,
unsigned int val) {
if (val)
regmap_write(regmap, reg, val);
}
and how are we so lucky that zero isn't a value that we may need to
write?
> +
> + if (config->alpha)
> + regmap_write(regmap, PLL_ALPHA_VAL(pll), config->alpha);
> +
> + if (config->user_ctl_val)
> + regmap_write(regmap, PLL_USER_CTL(pll), config->user_ctl_val);
> +
> + if (config->config_ctl_val)
> + regmap_write(regmap, PLL_CONFIG_CTL(pll),
> + config->config_ctl_val);
> +
> + if (config->config_ctl_hi_val)
> + regmap_write(regmap, PLL_CONFIG_CTL_U(pll),
> + config->config_ctl_hi_val);
> +
> + if (config->test_ctl_val)
> + regmap_write(regmap, PLL_TEST_CTL(pll),
> + config->test_ctl_val);
> +
> + if (config->test_ctl_hi_val)
> + regmap_write(regmap, PLL_TEST_CTL_U(pll),
> + config->test_ctl_hi_val);
> +}
> +EXPORT_SYMBOL_GPL(clk_agera_pll_configure);
> +
> +static int clk_alpha_pll_agera_set_rate(struct clk_hw *hw, unsigned long rate,
> + unsigned long prate)
> +{
> + struct clk_alpha_pll *pll = to_clk_alpha_pll(hw);
> + u32 l, alpha_width = pll_alpha_width(pll);
> + unsigned long rrate, max = rate + PLL_RATE_MARGIN;
> + u64 a;
> +
> + rrate = alpha_pll_round_rate(rate, prate, &l, &a, alpha_width);
> +
> + /*
> + * Due to limited number of bits for fractional rate programming, the
> + * rounded up rate could be marginally higher than the requested rate.
> + */
> + if (rrate > (rate + PLL_RATE_MARGIN) || rrate < rate) {
> + pr_err("%s: Rounded rate %lu not within range [%lu, %lu)\n",
> + clk_hw_get_name(hw), rrate, rate, max);
> + return -EINVAL;
> + }
Can this be extracted into a helper function?
> +
> + /* change L_VAL without having to go through the power on sequence */
> + regmap_write(pll->clkr.regmap, PLL_L_VAL(pll), l);
> + regmap_write(pll->clkr.regmap, PLL_ALPHA_VAL(pll), a);
> +
> + if (clk_hw_is_enabled(hw))
> + return wait_for_pll_enable_lock(pll);
> +
> + return 0;
> +}
> +
Thanks Stephen for the review comments.
On 10/14/2020 7:37 AM, Stephen Boyd wrote:
> Quoting Taniya Das (2020-10-13 10:11:48)
>> diff --git a/drivers/clk/qcom/clk-alpha-pll.c b/drivers/clk/qcom/clk-alpha-pll.c
>> index 26139ef..17e1fc0 100644
>> --- a/drivers/clk/qcom/clk-alpha-pll.c
>> +++ b/drivers/clk/qcom/clk-alpha-pll.c
>> @@ -1561,3 +1571,73 @@ const struct clk_ops clk_alpha_pll_postdiv_lucid_ops = {
>> .set_rate = clk_alpha_pll_postdiv_fabia_set_rate,
>> };
>> EXPORT_SYMBOL_GPL(clk_alpha_pll_postdiv_lucid_ops);
>> +
>> +void clk_agera_pll_configure(struct clk_alpha_pll *pll, struct regmap *regmap,
>> + const struct alpha_pll_config *config)
>> +{
>> + if (config->l)
>> + regmap_write(regmap, PLL_L_VAL(pll), config->l);
>
> Maybe make a helper function for this too. That way we can't mix up the
> if condition with the value in the write.
>
Sure, I will add a helper function.
> clk_alpha_pll_write_config(regmap, PLL_L_VAL(pll), config->l);
>
> static void clk_alpha_pll_write_config(struct regmap *regmap,
> unsigned int reg,
> unsigned int val) {
> if (val)
> regmap_write(regmap, reg, val);
> }
>
> and how are we so lucky that zero isn't a value that we may need to
> write?
>
>> +
>> + if (config->alpha)
>> + regmap_write(regmap, PLL_ALPHA_VAL(pll), config->alpha);
>> +
>> + if (config->user_ctl_val)
>> + regmap_write(regmap, PLL_USER_CTL(pll), config->user_ctl_val);
>> +
>> + if (config->config_ctl_val)
>> + regmap_write(regmap, PLL_CONFIG_CTL(pll),
>> + config->config_ctl_val);
>> +
>> + if (config->config_ctl_hi_val)
>> + regmap_write(regmap, PLL_CONFIG_CTL_U(pll),
>> + config->config_ctl_hi_val);
>> +
>> + if (config->test_ctl_val)
>> + regmap_write(regmap, PLL_TEST_CTL(pll),
>> + config->test_ctl_val);
>> +
>> + if (config->test_ctl_hi_val)
>> + regmap_write(regmap, PLL_TEST_CTL_U(pll),
>> + config->test_ctl_hi_val);
>> +}
>> +EXPORT_SYMBOL_GPL(clk_agera_pll_configure);
>> +
>> +static int clk_alpha_pll_agera_set_rate(struct clk_hw *hw, unsigned long rate,
>> + unsigned long prate)
>> +{
>> + struct clk_alpha_pll *pll = to_clk_alpha_pll(hw);
>> + u32 l, alpha_width = pll_alpha_width(pll);
>> + unsigned long rrate, max = rate + PLL_RATE_MARGIN;
>> + u64 a;
>> +
>> + rrate = alpha_pll_round_rate(rate, prate, &l, &a, alpha_width);
>> +
>> + /*
>> + * Due to limited number of bits for fractional rate programming, the
>> + * rounded up rate could be marginally higher than the requested rate.
>> + */
>> + if (rrate > (rate + PLL_RATE_MARGIN) || rrate < rate) {
>> + pr_err("%s: Rounded rate %lu not within range [%lu, %lu)\n",
>> + clk_hw_get_name(hw), rrate, rate, max);
>> + return -EINVAL;
>> + }
>
> Can this be extracted into a helper function?
>
Yes, I will add this too.
>> +
>> + /* change L_VAL without having to go through the power on sequence */
>> + regmap_write(pll->clkr.regmap, PLL_L_VAL(pll), l);
>> + regmap_write(pll->clkr.regmap, PLL_ALPHA_VAL(pll), a);
>> +
>> + if (clk_hw_is_enabled(hw))
>> + return wait_for_pll_enable_lock(pll);
>> +
>> + return 0;
>> +}
>> +
--
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
of Code Aurora Forum, hosted by The Linux Foundation.
--