Vishwanath BS <vishwanath.bs@xxxxxx> writes:
> From: Thara Gopinath <thara@xxxxxx>
>
> This patch also introduces omap3_mpu_set_rate, omap3_iva_set_rate,
> omap3_l3_set_rate, omap3_mpu_get_rate, omap3_iva_get_rate,
> omap3_l3_get_rate as device specific set rate and get rate
> APIs for OMAP3 mpu, iva and l3_main devices. This patch also
> calls into omap_device_populate_rate_fns during system init to register
> various set_rate and get_rate APIs with the omap device layer
>
> Signed-off-by: Thara Gopinath <thara@xxxxxx>
> ---
> arch/arm/mach-omap2/pm.c | 71 ++++++++++++++++++++++++++++++++++++++++++++++
> 1 files changed, 71 insertions(+), 0 deletions(-)
>
> diff --git a/arch/arm/mach-omap2/pm.c b/arch/arm/mach-omap2/pm.c
> index d5a102c..1b94ad4 100644
> --- a/arch/arm/mach-omap2/pm.c
> +++ b/arch/arm/mach-omap2/pm.c
> @@ -23,6 +23,9 @@
> #include "powerdomain.h"
> #include "clockdomain.h"
> #include "pm.h"
> +#include "cm2xxx_3xxx.h"
> +#include "cm-regbits-34xx.h"
> +#include "prm.h"
>
> static struct omap_device_pm_latency *pm_lats;
>
> @@ -31,6 +34,8 @@ static struct device *iva_dev;
> static struct device *l3_dev;
> static struct device *dsp_dev;
>
> +static struct clk *dpll1_clk, *dpll2_clk, *dpll3_clk;
> +
> struct device *omap2_get_mpuss_device(void)
> {
> WARN_ON_ONCE(!mpu_dev);
> @@ -77,6 +82,55 @@ static int _init_omap_device(char *name, struct device **new_dev)
> return 0;
> }
>
> +static unsigned long omap3_mpu_get_rate(struct device *dev)
> +{
> + return dpll1_clk->rate;
> +}
> +
> +static int omap3_mpu_set_rate(struct device *dev, unsigned long rate)
> +{
> + int ret;
> +
> + ret = clk_set_rate(dpll1_clk, rate);
> + if (ret) {
> + dev_warn(dev, "%s: Unable to set rate to %ld\n",
> + __func__, rate);
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static int omap3_iva_set_rate(struct device *dev, unsigned long rate)
> +{
> + return clk_set_rate(dpll2_clk, rate);
> +}
> +
> +static unsigned long omap3_iva_get_rate(struct device *dev)
> +{
> + return dpll2_clk->rate;
> +}
> +
> +static int omap3_l3_set_rate(struct device *dev, unsigned long rate)
> +{
> + int l3_div;
> +
> + l3_div = omap2_cm_read_mod_reg(CORE_MOD, CM_CLKSEL) &
> + OMAP3430_CLKSEL_L3_MASK;
> +
> + return clk_set_rate(dpll3_clk, rate * l3_div);
> +}
> +
> +static unsigned long omap3_l3_get_rate(struct device *dev)
> +{
> + int l3_div;
> +
> + l3_div = omap2_cm_read_mod_reg(CORE_MOD, CM_CLKSEL) &
> + OMAP3430_CLKSEL_L3_MASK;
> + return dpll3_clk->rate / l3_div;
> +}
> +
> +
> /*
> * Build omap_devices for processors and bus.
> */
> @@ -90,6 +144,23 @@ static void omap2_init_processor_devices(void)
> } else {
> _init_omap_device("l3_main", &l3_dev);
> }
> +
> + if (cpu_is_omap34xx()) {
> + dpll1_clk = clk_get(NULL, "dpll1_ck");
> + dpll2_clk = clk_get(NULL, "dpll2_ck");
> + dpll3_clk = clk_get(NULL, "dpll3_m2_ck");
Should check return value of clk_get() calls.
> + if (mpu_dev)
> + omap_device_register_dvfs_callbacks(mpu_dev,
> + omap3_mpu_set_rate, omap3_mpu_get_rate);
> + if (iva_dev)
> + omap_device_register_dvfs_callbacks(iva_dev,
> + omap3_iva_set_rate, omap3_iva_get_rate);
> + if (l3_dev)
> + omap_device_register_dvfs_callbacks(l3_dev,
> + omap3_l3_set_rate, omap3_l3_get_rate);
> +
> + }
> }
>
> /* Types of sleep_switch used in omap_set_pwrdm_state */
Kevin
--
To unsubscribe from this list: send the line "unsubscribe linux-omap" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
