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SubjectRe: [PATCH 4/7] cpufreq: qcom-hw: Make use of of_match data for offsets and row size
On Tue 08 Sep 02:57 CDT 2020, Manivannan Sadhasivam wrote:

> For preparing the driver to handle further SoC revisions, let's use the
> of_match data for getting the device specific offsets and row size instead
> of defining them globally.
>
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
> ---
> drivers/cpufreq/qcom-cpufreq-hw.c | 96 +++++++++++++++++++++----------
> 1 file changed, 66 insertions(+), 30 deletions(-)
>
> diff --git a/drivers/cpufreq/qcom-cpufreq-hw.c b/drivers/cpufreq/qcom-cpufreq-hw.c
> index ccea34f61152..41853db7c9b8 100644
> --- a/drivers/cpufreq/qcom-cpufreq-hw.c
> +++ b/drivers/cpufreq/qcom-cpufreq-hw.c
> @@ -19,15 +19,21 @@
> #define LUT_L_VAL GENMASK(7, 0)
> #define LUT_CORE_COUNT GENMASK(18, 16)
> #define LUT_VOLT GENMASK(11, 0)
> -#define LUT_ROW_SIZE 32
> #define CLK_HW_DIV 2
> #define LUT_TURBO_IND 1
>
> -/* Register offsets */
> -#define REG_ENABLE 0x0
> -#define REG_FREQ_LUT 0x110
> -#define REG_VOLT_LUT 0x114
> -#define REG_PERF_STATE 0x920
> +struct qcom_cpufreq_soc_data {
> + u32 reg_enable;
> + u32 reg_freq_lut;
> + u32 reg_volt_lut;
> + u32 reg_perf_state;
> + u8 lut_row_size;
> +};
> +
> +struct qcom_cpufreq_data {
> + void __iomem *base;
> + const struct qcom_cpufreq_soc_data *soc_data;
> +};
>
> static unsigned long cpu_hw_rate, xo_rate;
> static bool icc_scaling_enabled;
> @@ -76,10 +82,11 @@ static int qcom_cpufreq_update_opp(struct device *cpu_dev,
> static int qcom_cpufreq_hw_target_index(struct cpufreq_policy *policy,
> unsigned int index)
> {
> - void __iomem *perf_state_reg = policy->driver_data;
> + struct qcom_cpufreq_data *data = policy->driver_data;
> + const struct qcom_cpufreq_soc_data *soc_data = data->soc_data;
> unsigned long freq = policy->freq_table[index].frequency;
>
> - writel_relaxed(index, perf_state_reg);
> + writel_relaxed(index, data->base + soc_data->reg_perf_state);
>
> if (icc_scaling_enabled)
> qcom_cpufreq_set_bw(policy, freq);
> @@ -91,7 +98,8 @@ static int qcom_cpufreq_hw_target_index(struct cpufreq_policy *policy,
>
> static unsigned int qcom_cpufreq_hw_get(unsigned int cpu)
> {
> - void __iomem *perf_state_reg;
> + struct qcom_cpufreq_data *data;
> + const struct qcom_cpufreq_soc_data *soc_data;
> struct cpufreq_policy *policy;
> unsigned int index;
>
> @@ -99,9 +107,10 @@ static unsigned int qcom_cpufreq_hw_get(unsigned int cpu)
> if (!policy)
> return 0;
>
> - perf_state_reg = policy->driver_data;
> + data = policy->driver_data;
> + soc_data = data->soc_data;
>
> - index = readl_relaxed(perf_state_reg);
> + index = readl_relaxed(data->base + soc_data->reg_perf_state);
> index = min(index, LUT_MAX_ENTRIES - 1);
>
> return policy->freq_table[index].frequency;
> @@ -110,12 +119,13 @@ static unsigned int qcom_cpufreq_hw_get(unsigned int cpu)
> static unsigned int qcom_cpufreq_hw_fast_switch(struct cpufreq_policy *policy,
> unsigned int target_freq)
> {
> - void __iomem *perf_state_reg = policy->driver_data;
> + struct qcom_cpufreq_data *data = policy->driver_data;
> + const struct qcom_cpufreq_soc_data *soc_data = data->soc_data;
> unsigned int index;
> unsigned long freq;
>
> index = policy->cached_resolved_idx;
> - writel_relaxed(index, perf_state_reg);
> + writel_relaxed(index, data->base + soc_data->reg_perf_state);
>
> freq = policy->freq_table[index].frequency;
> arch_set_freq_scale(policy->related_cpus, freq,
> @@ -125,8 +135,7 @@ static unsigned int qcom_cpufreq_hw_fast_switch(struct cpufreq_policy *policy,
> }
>
> static int qcom_cpufreq_hw_read_lut(struct device *cpu_dev,
> - struct cpufreq_policy *policy,
> - void __iomem *base)
> + struct cpufreq_policy *policy)
> {
> u32 data, src, lval, i, core_count, prev_freq = 0, freq;
> u32 volt;
> @@ -134,6 +143,8 @@ static int qcom_cpufreq_hw_read_lut(struct device *cpu_dev,
> struct dev_pm_opp *opp;
> unsigned long rate;
> int ret;
> + struct qcom_cpufreq_data *drv_data = policy->driver_data;
> + const struct qcom_cpufreq_soc_data *soc_data = drv_data->soc_data;
>
> table = kcalloc(LUT_MAX_ENTRIES + 1, sizeof(*table), GFP_KERNEL);
> if (!table)
> @@ -160,14 +171,14 @@ static int qcom_cpufreq_hw_read_lut(struct device *cpu_dev,
> }
>
> for (i = 0; i < LUT_MAX_ENTRIES; i++) {
> - data = readl_relaxed(base + REG_FREQ_LUT +
> - i * LUT_ROW_SIZE);
> + data = readl_relaxed(drv_data->base + soc_data->reg_freq_lut +
> + i * soc_data->lut_row_size);
> src = FIELD_GET(LUT_SRC, data);
> lval = FIELD_GET(LUT_L_VAL, data);
> core_count = FIELD_GET(LUT_CORE_COUNT, data);
>
> - data = readl_relaxed(base + REG_VOLT_LUT +
> - i * LUT_ROW_SIZE);
> + data = readl_relaxed(drv_data->base + soc_data->reg_volt_lut +
> + i * soc_data->lut_row_size);
> volt = FIELD_GET(LUT_VOLT, data) * 1000;
>
> if (src)
> @@ -237,6 +248,20 @@ static void qcom_get_related_cpus(int index, struct cpumask *m)
> }
> }
>
> +static const struct qcom_cpufreq_soc_data qcom_soc_data = {
> + .reg_enable = 0x0,
> + .reg_freq_lut = 0x110,
> + .reg_volt_lut = 0x114,
> + .reg_perf_state = 0x920,
> + .lut_row_size = 32,
> +};
> +
> +static const struct of_device_id qcom_cpufreq_hw_match[] = {
> + { .compatible = "qcom,cpufreq-hw", .data = &qcom_soc_data },
> + {}
> +};
> +MODULE_DEVICE_TABLE(of, qcom_cpufreq_hw_match);
> +
> static int qcom_cpufreq_hw_cpu_init(struct cpufreq_policy *policy)
> {
> struct platform_device *pdev = cpufreq_get_driver_data();
> @@ -246,6 +271,8 @@ static int qcom_cpufreq_hw_cpu_init(struct cpufreq_policy *policy)
> struct device *cpu_dev;
> struct resource *res;
> void __iomem *base;
> + struct qcom_cpufreq_data *data;
> + const struct of_device_id *match;
> int ret, index;
>
> cpu_dev = get_cpu_device(policy->cpu);
> @@ -275,8 +302,23 @@ static int qcom_cpufreq_hw_cpu_init(struct cpufreq_policy *policy)
> if (!base)
> return -ENOMEM;
>
> + data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
> + if (!data) {
> + ret = -ENOMEM;
> + goto error;
> + }
> +
> + match = of_match_device(qcom_cpufreq_hw_match, &pdev->dev);

Rather than having to move the qcom_cpufreq_hw_match table and reference
it here, use the more succinct:

data->soc-data = of_device_get_match_data(&pdev->dev);

Apart from this, I think the patch looks good.

> + if (!match) {
> + ret = -ENODEV;
> + goto error;
> + }
> +
> + data->soc_data = match->data;
> + data->base = base;
> +
> /* HW should be in enabled state to proceed */
> - if (!(readl_relaxed(base + REG_ENABLE) & 0x1)) {
> + if (!(readl_relaxed(base + data->soc_data->reg_enable) & 0x1)) {
> dev_err(dev, "Domain-%d cpufreq hardware not enabled\n", index);
> ret = -ENODEV;
> goto error;
> @@ -289,9 +331,9 @@ static int qcom_cpufreq_hw_cpu_init(struct cpufreq_policy *policy)
> goto error;
> }
>
> - policy->driver_data = base + REG_PERF_STATE;
> + policy->driver_data = data;
>
> - ret = qcom_cpufreq_hw_read_lut(cpu_dev, policy, base);
> + ret = qcom_cpufreq_hw_read_lut(cpu_dev, policy);
> if (ret) {
> dev_err(dev, "Domain-%d failed to read LUT\n", index);
> goto error;
> @@ -315,13 +357,13 @@ static int qcom_cpufreq_hw_cpu_init(struct cpufreq_policy *policy)
> static int qcom_cpufreq_hw_cpu_exit(struct cpufreq_policy *policy)
> {
> struct device *cpu_dev = get_cpu_device(policy->cpu);
> - void __iomem *base = policy->driver_data - REG_PERF_STATE;
> + struct qcom_cpufreq_data *data = policy->driver_data;
> struct platform_device *pdev = cpufreq_get_driver_data();
>
> dev_pm_opp_remove_all_dynamic(cpu_dev);
> dev_pm_opp_of_cpumask_remove_table(policy->related_cpus);
> kfree(policy->freq_table);
> - devm_iounmap(&pdev->dev, base);
> + devm_iounmap(&pdev->dev, data->base);

PS. Unrelated to your series, I don't like the fact that we use devres
in code paths that's only indirectly tied to the device's life cycle.

Regards,
Bjorn

>
> return 0;
> }
> @@ -391,12 +433,6 @@ static int qcom_cpufreq_hw_driver_remove(struct platform_device *pdev)
> return cpufreq_unregister_driver(&cpufreq_qcom_hw_driver);
> }
>
> -static const struct of_device_id qcom_cpufreq_hw_match[] = {
> - { .compatible = "qcom,cpufreq-hw" },
> - {}
> -};
> -MODULE_DEVICE_TABLE(of, qcom_cpufreq_hw_match);
> -
> static struct platform_driver qcom_cpufreq_hw_driver = {
> .probe = qcom_cpufreq_hw_driver_probe,
> .remove = qcom_cpufreq_hw_driver_remove,
> --
> 2.17.1
>

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