davinci: cpuidle: move mapping of DDR2 controller registers out of driver

When suspend is supported, both cpuidle and suspend code
need to work on DDR2 registers. Instead of mapping the
DDR2 registers twice, do it once outside of cpuidle
driver and let cpuidle driver get the virtual base address
of DDR2 registers.

Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>

arch/arm/mach-davinci/cpuidle.c

@@ -106,8 +106,6 @@ static int __init davinci_cpuidle_probe(struct platform_device *pdev)
 	int ret;
 	struct cpuidle_device *device;
 	struct davinci_cpuidle_config *pdata = pdev->dev.platform_data;
-	struct resource *ddr2_regs;
-	resource_size_t len;
 
 	device = &per_cpu(davinci_cpuidle_device, smp_processor_id());
 
@@ -116,28 +114,12 @@ static int __init davinci_cpuidle_probe(struct platform_device *pdev)
 		return -ENOENT;
 	}
 
-	ddr2_regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!ddr2_regs) {
-		dev_err(&pdev->dev, "cannot get DDR2 controller register base");
-		return -ENODEV;
-	}
-
-	len = resource_size(ddr2_regs);
-
-	ddr2_regs = request_mem_region(ddr2_regs->start, len, ddr2_regs->name);
-	if (!ddr2_regs)
-		return -EBUSY;
-
-	ddr2_reg_base = ioremap(ddr2_regs->start, len);
-	if (!ddr2_reg_base) {
-		ret = -ENOMEM;
-		goto ioremap_fail;
-	}
+	ddr2_reg_base = pdata->ddr2_ctlr_base;
 
 	ret = cpuidle_register_driver(&davinci_idle_driver);
 	if (ret) {
 		dev_err(&pdev->dev, "failed to register driver\n");
-		goto driver_register_fail;
+		return ret;
 	}
 
 	/* Wait for interrupt state */
@@ -164,18 +146,11 @@ static int __init davinci_cpuidle_probe(struct platform_device *pdev)
 	ret = cpuidle_register_device(device);
 	if (ret) {
 		dev_err(&pdev->dev, "failed to register device\n");
-		goto device_register_fail;
+		cpuidle_unregister_driver(&davinci_idle_driver);
+		return ret;
 	}
 
 	return 0;
-
-device_register_fail:
-	cpuidle_unregister_driver(&davinci_idle_driver);
-driver_register_fail:
-	iounmap(ddr2_reg_base);
-ioremap_fail:
-	release_mem_region(ddr2_regs->start, len);
-	return ret;
 }
 
 static struct platform_driver davinci_cpuidle_driver = {

arch/arm/mach-davinci/devices-da8xx.c

@@ -496,6 +496,19 @@ int da8xx_register_rtc(void)
 	return ret;
 }
 
+static void __iomem *da8xx_ddr2_ctlr_base;
+void __iomem * __init da8xx_get_mem_ctlr(void)
+{
+	if (da8xx_ddr2_ctlr_base)
+		return da8xx_ddr2_ctlr_base;
+
+	da8xx_ddr2_ctlr_base = ioremap(DA8XX_DDR2_CTL_BASE, SZ_32K);
+	if (!da8xx_ddr2_ctlr_base)
+		pr_warning("%s: Unable to map DDR2 controller",	__func__);
+
+	return da8xx_ddr2_ctlr_base;
+}
+
 static struct resource da8xx_cpuidle_resources[] = {
 	{
 		.start		= DA8XX_DDR2_CTL_BASE,
@@ -521,6 +534,7 @@ static struct platform_device da8xx_cpuidle_device = {
 
 int __init da8xx_register_cpuidle(void)
 {
+	da8xx_cpuidle_pdata.ddr2_ctlr_base = da8xx_get_mem_ctlr();
+
 	return platform_device_register(&da8xx_cpuidle_device);
 }
-

arch/arm/mach-davinci/include/mach/cpuidle.h

@@ -12,6 +12,7 @@
 
 struct davinci_cpuidle_config {
 	u32 ddr2_pdown;
+	void __iomem *ddr2_ctlr_base;
 };
 
 #endif

arch/arm/mach-davinci/include/mach/da8xx.h

@@ -94,6 +94,7 @@ void __init da8xx_register_mcasp(int id, struct snd_platform_data *pdata);
 int da8xx_register_rtc(void);
 int da850_register_cpufreq(void);
 int da8xx_register_cpuidle(void);
+void __iomem * __init da8xx_get_mem_ctlr(void);
 
 extern struct platform_device da8xx_serial_device;
 extern struct emac_platform_data da8xx_emac_pdata;