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authorThara Gopinath <thara@ti.com>2010-12-27 18:01:18 +0530
committerNicolas Pitre <nicolas.pitre@linaro.org>2011-02-21 23:10:40 -0500
commit71accc3b55813344d2bb0b696e16c82891d20a07 (patch)
tree13ef9c6c84d2a398b65bab1d699b0ad541cf9654
parentc00ae4ac1e16e11cb9bd69703614d32df203b688 (diff)
downloadlinux-linaro-71accc3b55813344d2bb0b696e16c82891d20a07.tar.gz
OMAP3: Introduce custom set rate and get rate APIs for scalable devices
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@ti.com>
-rw-r--r--arch/arm/mach-omap2/pm.c71
1 files changed, 71 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/pm.c b/arch/arm/mach-omap2/pm.c
index d5a102c7198..1b94ad47b07 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");
+
+ 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 */