OMAP3+: VP: move SoC-specific sys clock rate retreival late init

Add sys clock name and rate to struct voltage domain.  SoC specific
voltagedomain init code initializes sys clock name.  After clock
framework is initialized, voltage late init will then use use the
sys_clk rate to calculate the various timing that depend on that rate.
Signed-off-by: Kevin Hilman <khilman@ti.com>

arch/arm/mach-omap2/voltage.c

@@ -21,10 +21,10 @@
 
 #include <linux/delay.h>
 #include <linux/io.h>
-#include <linux/clk.h>
 #include <linux/err.h>
 #include <linux/debugfs.h>
 #include <linux/slab.h>
+#include <linux/clk.h>
 
 #include <plat/common.h>
 
@@ -45,36 +45,12 @@ static LIST_HEAD(voltdm_list);
 
 static int __init _config_common_vdd_data(struct voltagedomain *voltdm)
 {
-	char *sys_ck_name;
-	struct clk *sys_ck;
-	u32 sys_clk_speed, timeout_val, waittime;
 	struct omap_vdd_info *vdd = voltdm->vdd;
+	u32 sys_clk_rate, timeout_val, waittime;
 
-	/*
-	 * XXX Clockfw should handle this, or this should be in a
-	 * struct record
-	 */
-	if (cpu_is_omap24xx() || cpu_is_omap34xx())
-		sys_ck_name = "sys_ck";
-	else if (cpu_is_omap44xx())
-		sys_ck_name = "sys_clkin_ck";
-	else
-		return -EINVAL;
-
-	/*
-	 * Sys clk rate is require to calculate vp timeout value and
-	 * smpswaittimemin and smpswaittimemax.
-	 */
-	sys_ck = clk_get(NULL, sys_ck_name);
-	if (IS_ERR(sys_ck)) {
-		pr_warning("%s: Could not get the sys clk to calculate"
-			"various vdd_%s params\n", __func__, voltdm->name);
-		return -EINVAL;
-	}
-	sys_clk_speed = clk_get_rate(sys_ck);
-	clk_put(sys_ck);
 	/* Divide to avoid overflow */
-	sys_clk_speed /= 1000;
+	sys_clk_rate = voltdm->sys_clk.rate / 1000;
+	WARN_ON(!sys_clk_rate);
 
 	/* Generic voltage parameters */
 	vdd->volt_scale = omap_vp_forceupdate_scale;
@@ -84,13 +60,13 @@ static int __init _config_common_vdd_data(struct voltagedomain *voltdm)
 		(voltdm->pmic->vp_erroroffset <<
 		 __ffs(voltdm->vp->common->vpconfig_erroroffset_mask));
 
-	timeout_val = (sys_clk_speed * voltdm->pmic->vp_timeout_us) / 1000;
+	timeout_val = (sys_clk_rate * voltdm->pmic->vp_timeout_us) / 1000;
 	vdd->vp_rt_data.vlimitto_timeout = timeout_val;
 	vdd->vp_rt_data.vlimitto_vddmin = voltdm->pmic->vp_vddmin;
 	vdd->vp_rt_data.vlimitto_vddmax = voltdm->pmic->vp_vddmax;
 
 	waittime = ((voltdm->pmic->step_size / voltdm->pmic->slew_rate) *
-				sys_clk_speed) / 1000;
+		    sys_clk_rate) / 1000;
 	vdd->vp_rt_data.vstepmin_smpswaittimemin = waittime;
 	vdd->vp_rt_data.vstepmax_smpswaittimemax = waittime;
 	vdd->vp_rt_data.vstepmin_stepmin = voltdm->pmic->vp_vstepmin;
@@ -346,9 +322,20 @@ int __init omap_voltage_late_init(void)
 	}
 
 	list_for_each_entry(voltdm, &voltdm_list, node) {
+		struct clk *sys_ck;
+
 		if (!voltdm->scalable)
 			continue;
 
+		sys_ck = clk_get(NULL, voltdm->sys_clk.name);
+		if (IS_ERR(sys_ck)) {
+			pr_warning("%s: Could not get sys clk.\n", __func__);
+			return -EINVAL;
+		}
+		voltdm->sys_clk.rate = clk_get_rate(sys_ck);
+		WARN_ON(!voltdm->sys_clk.rate);
+		clk_put(sys_ck);
+
 		if (voltdm->vc) {
 			voltdm->vdd->volt_scale = omap_vc_bypass_scale;
 			omap_vc_init_channel(voltdm);

arch/arm/mach-omap2/voltage.h

@@ -59,6 +59,7 @@ struct omap_vfsm_instance {
  * @read: read a VC/VP register
  * @write: write a VC/VP register
  * @read: read-modify-write a VC/VP register
+ * @sys_clk: system clock name/frequency, used for various timing calculations
  * @vdd: to be removed
  */
 struct voltagedomain {
@@ -76,6 +77,11 @@ struct voltagedomain {
 	void (*write) (u32 val, u8 offset);
 	u32 (*rmw)(u32 mask, u32 bits, u8 offset);
 
+	union {
+		const char *name;
+		u32 rate;
+	} sys_clk;
+
 	struct omap_vdd_info *vdd;
 };
 

arch/arm/mach-omap2/voltagedomains3xxx_data.c

@@ -80,8 +80,13 @@ static struct voltagedomain *voltagedomains_omap3[] __initdata = {
 	NULL,
 };
 
+static const char *sys_clk_name __initdata = "sys_ck";
+
 void __init omap3xxx_voltagedomains_init(void)
 {
+	struct voltagedomain *voltdm;
+	int i;
+
 	/*
 	 * XXX Will depend on the process, validation, and binning
 	 * for the currently-running IC
@@ -94,5 +99,8 @@ void __init omap3xxx_voltagedomains_init(void)
 		omap3_vdd2_info.volt_data = omap34xx_vddcore_volt_data;
 	}
 
+	for (i = 0; voltdm = voltagedomains_omap3[i], voltdm; i++)
+		voltdm->sys_clk.name = sys_clk_name;
+
 	voltdm_init(voltagedomains_omap3);
 };

arch/arm/mach-omap2/voltagedomains44xx_data.c

@@ -98,8 +98,13 @@ static struct voltagedomain *voltagedomains_omap4[] __initdata = {
 	NULL,
 };
 
+static const char *sys_clk_name __initdata = "sys_clkin_ck";
+
 void __init omap44xx_voltagedomains_init(void)
 {
+	struct voltagedomain *voltdm;
+	int i;
+
 	/*
 	 * XXX Will depend on the process, validation, and binning
 	 * for the currently-running IC
@@ -108,5 +113,8 @@ void __init omap44xx_voltagedomains_init(void)
 	omap4_vdd_iva_info.volt_data = omap44xx_vdd_iva_volt_data;
 	omap4_vdd_core_info.volt_data = omap44xx_vdd_core_volt_data;
 
+	for (i = 0; voltdm = voltagedomains_omap4[i], voltdm; i++)
+		voltdm->sys_clk.name = sys_clk_name;
+
 	voltdm_init(voltagedomains_omap4);
 };