[PATCH 07/13] OMAP3: Introduce custom set rate and get rate APIs for scalable devices

[Vishwanath BS <vishwanath.bs@ti.com>]

From: Thara Gopinath <thara@ti.com>

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>
---
 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");
+
+		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 */
-- 
1.7.0.4