1 files changed, 152 insertions, 73 deletions

diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c
index 5244c4724df..402ec3970fe 100644
--- a/drivers/i2c/busses/i2c-designware-platdrv.c
+++ b/drivers/i2c/busses/i2c-designware-platdrv.c
@@ -34,10 +34,13 @@
 #include <linux/sched.h>
 #include <linux/err.h>
 #include <linux/interrupt.h>
-#include <linux/of_i2c.h>
+#include <linux/of.h>
 #include <linux/platform_device.h>
+#include <linux/pm.h>
+#include <linux/pm_runtime.h>
 #include <linux/io.h>
 #include <linux/slab.h>
+#include <linux/acpi.h>
 #include "i2c-designware-core.h"
 
 static struct i2c_algorithm i2c_dw_algo = {
@@ -49,53 +52,121 @@ static u32 i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev)
 	return clk_get_rate(dev->clk)/1000;
 }
 
-static int __devinit dw_i2c_probe(struct platform_device *pdev)
+#ifdef CONFIG_ACPI
+static void dw_i2c_acpi_params(struct platform_device *pdev, char method[],
+			       u16 *hcnt, u16 *lcnt, u32 *sda_hold)
+{
+	struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER };
+	acpi_handle handle = ACPI_HANDLE(&pdev->dev);
+	union acpi_object *obj;
+
+	if (ACPI_FAILURE(acpi_evaluate_object(handle, method, NULL, &buf)))
+		return;
+
+	obj = (union acpi_object *)buf.pointer;
+	if (obj->type == ACPI_TYPE_PACKAGE && obj->package.count == 3) {
+		const union acpi_object *objs = obj->package.elements;
+
+		*hcnt = (u16)objs[0].integer.value;
+		*lcnt = (u16)objs[1].integer.value;
+		if (sda_hold)
+			*sda_hold = (u32)objs[2].integer.value;
+	}
+
+	kfree(buf.pointer);
+}
+
+static int dw_i2c_acpi_configure(struct platform_device *pdev)
+{
+	struct dw_i2c_dev *dev = platform_get_drvdata(pdev);
+	bool fs_mode = dev->master_cfg & DW_IC_CON_SPEED_FAST;
+
+	if (!ACPI_HANDLE(&pdev->dev))
+		return -ENODEV;
+
+	dev->adapter.nr = -1;
+	dev->tx_fifo_depth = 32;
+	dev->rx_fifo_depth = 32;
+
+	/*
+	 * Try to get SDA hold time and *CNT values from an ACPI method if
+	 * it exists for both supported speed modes.
+	 */
+	dw_i2c_acpi_params(pdev, "SSCN", &dev->ss_hcnt, &dev->ss_lcnt,
+			   fs_mode ? NULL : &dev->sda_hold_time);
+	dw_i2c_acpi_params(pdev, "FMCN", &dev->fs_hcnt, &dev->fs_lcnt,
+			   fs_mode ? &dev->sda_hold_time : NULL);
+
+	return 0;
+}
+
+static const struct acpi_device_id dw_i2c_acpi_match[] = {
+	{ "INT33C2", 0 },
+	{ "INT33C3", 0 },
+	{ "INT3432", 0 },
+	{ "INT3433", 0 },
+	{ "80860F41", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(acpi, dw_i2c_acpi_match);
+#else
+static inline int dw_i2c_acpi_configure(struct platform_device *pdev)
+{
+	return -ENODEV;
+}
+#endif
+
+static int dw_i2c_probe(struct platform_device *pdev)
 {
 	struct dw_i2c_dev *dev;
 	struct i2c_adapter *adap;
-	struct resource *mem, *ioarea;
+	struct resource *mem;
 	int irq, r;
 
-	/* NOTE: driver uses the static register mapping */
-	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!mem) {
-		dev_err(&pdev->dev, "no mem resource?\n");
-		return -EINVAL;
-	}
-
 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0) {
 		dev_err(&pdev->dev, "no irq resource?\n");
 		return irq; /* -ENXIO */
 	}
 
-	ioarea = request_mem_region(mem->start, resource_size(mem),
-			pdev->name);
-	if (!ioarea) {
-		dev_err(&pdev->dev, "I2C region already claimed\n");
-		return -EBUSY;
-	}
+	dev = devm_kzalloc(&pdev->dev, sizeof(struct dw_i2c_dev), GFP_KERNEL);
+	if (!dev)
+		return -ENOMEM;
 
-	dev = kzalloc(sizeof(struct dw_i2c_dev), GFP_KERNEL);
-	if (!dev) {
-		r = -ENOMEM;
-		goto err_release_region;
-	}
+	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	dev->base = devm_ioremap_resource(&pdev->dev, mem);
+	if (IS_ERR(dev->base))
+		return PTR_ERR(dev->base);
 
 	init_completion(&dev->cmd_complete);
 	mutex_init(&dev->lock);
-	dev->dev = get_device(&pdev->dev);
+	dev->dev = &pdev->dev;
 	dev->irq = irq;
 	platform_set_drvdata(pdev, dev);
 
-	dev->clk = clk_get(&pdev->dev, NULL);
+	dev->clk = devm_clk_get(&pdev->dev, NULL);
 	dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz;
 
-	if (IS_ERR(dev->clk)) {
-		r = -ENODEV;
-		goto err_free_mem;
+	if (IS_ERR(dev->clk))
+		return PTR_ERR(dev->clk);
+	clk_prepare_enable(dev->clk);
+
+	if (pdev->dev.of_node) {
+		u32 ht = 0;
+		u32 ic_clk = dev->get_clk_rate_khz(dev);
+
+		of_property_read_u32(pdev->dev.of_node,
+					"i2c-sda-hold-time-ns", &ht);
+		dev->sda_hold_time = div_u64((u64)ic_clk * ht + 500000,
+					     1000000);
+
+		of_property_read_u32(pdev->dev.of_node,
+				     "i2c-sda-falling-time-ns",
+				     &dev->sda_falling_time);
+		of_property_read_u32(pdev->dev.of_node,
+				     "i2c-scl-falling-time-ns",
+				     &dev->scl_falling_time);
 	}
-	clk_enable(dev->clk);
 
 	dev->functionality =
 		I2C_FUNC_I2C |
@@ -107,86 +178,64 @@ static int __devinit dw_i2c_probe(struct platform_device *pdev)
 	dev->master_cfg =  DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE |
 		DW_IC_CON_RESTART_EN | DW_IC_CON_SPEED_FAST;
 
-	dev->base = ioremap(mem->start, resource_size(mem));
-	if (dev->base == NULL) {
-		dev_err(&pdev->dev, "failure mapping io resources\n");
-		r = -EBUSY;
-		goto err_unuse_clocks;
-	}
-	{
+	/* Try first if we can configure the device from ACPI */
+	r = dw_i2c_acpi_configure(pdev);
+	if (r) {
 		u32 param1 = i2c_dw_read_comp_param(dev);
 
 		dev->tx_fifo_depth = ((param1 >> 16) & 0xff) + 1;
 		dev->rx_fifo_depth = ((param1 >> 8)  & 0xff) + 1;
+		dev->adapter.nr = pdev->id;
 	}
 	r = i2c_dw_init(dev);
 	if (r)
-		goto err_iounmap;
+		return r;
 
 	i2c_dw_disable_int(dev);
-	r = request_irq(dev->irq, i2c_dw_isr, IRQF_DISABLED, pdev->name, dev);
+	r = devm_request_irq(&pdev->dev, dev->irq, i2c_dw_isr, IRQF_SHARED,
+			pdev->name, dev);
 	if (r) {
 		dev_err(&pdev->dev, "failure requesting irq %i\n", dev->irq);
-		goto err_iounmap;
+		return r;
 	}
 
 	adap = &dev->adapter;
 	i2c_set_adapdata(adap, dev);
 	adap->owner = THIS_MODULE;
-	adap->class = I2C_CLASS_HWMON;
+	adap->class = I2C_CLASS_HWMON | I2C_CLASS_DEPRECATED;
 	strlcpy(adap->name, "Synopsys DesignWare I2C adapter",
 			sizeof(adap->name));
 	adap->algo = &i2c_dw_algo;
 	adap->dev.parent = &pdev->dev;
 	adap->dev.of_node = pdev->dev.of_node;
 
-	adap->nr = pdev->id;
 	r = i2c_add_numbered_adapter(adap);
 	if (r) {
 		dev_err(&pdev->dev, "failure adding adapter\n");
-		goto err_free_irq;
+		return r;
 	}
-	of_i2c_register_devices(adap);
 
-	return 0;
+	pm_runtime_set_autosuspend_delay(&pdev->dev, 1000);
+	pm_runtime_use_autosuspend(&pdev->dev);
+	pm_runtime_set_active(&pdev->dev);
+	pm_runtime_enable(&pdev->dev);
 
-err_free_irq:
-	free_irq(dev->irq, dev);
-err_iounmap:
-	iounmap(dev->base);
-err_unuse_clocks:
-	clk_disable(dev->clk);
-	clk_put(dev->clk);
-	dev->clk = NULL;
-err_free_mem:
-	platform_set_drvdata(pdev, NULL);
-	put_device(&pdev->dev);
-	kfree(dev);
-err_release_region:
-	release_mem_region(mem->start, resource_size(mem));
-
-	return r;
+	return 0;
 }
 
-static int __devexit dw_i2c_remove(struct platform_device *pdev)
+static int dw_i2c_remove(struct platform_device *pdev)
 {
 	struct dw_i2c_dev *dev = platform_get_drvdata(pdev);
-	struct resource *mem;
 
-	platform_set_drvdata(pdev, NULL);
-	i2c_del_adapter(&dev->adapter);
-	put_device(&pdev->dev);
+	pm_runtime_get_sync(&pdev->dev);
 
-	clk_disable(dev->clk);
-	clk_put(dev->clk);
-	dev->clk = NULL;
+	i2c_del_adapter(&dev->adapter);
 
 	i2c_dw_disable(dev);
-	free_irq(dev->irq, dev);
-	kfree(dev);
 
-	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	release_mem_region(mem->start, resource_size(mem));
+	pm_runtime_put(&pdev->dev);
+	pm_runtime_disable(&pdev->dev);
+
 	return 0;
 }
 
@@ -198,23 +247,53 @@ static const struct of_device_id dw_i2c_of_match[] = {
 MODULE_DEVICE_TABLE(of, dw_i2c_of_match);
 #endif
 
+#ifdef CONFIG_PM
+static int dw_i2c_suspend(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev);
+
+	i2c_dw_disable(i_dev);
+	clk_disable_unprepare(i_dev->clk);
+
+	return 0;
+}
+
+static int dw_i2c_resume(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev);
+
+	clk_prepare_enable(i_dev->clk);
+	i2c_dw_init(i_dev);
+
+	return 0;
+}
+#endif
+
+static UNIVERSAL_DEV_PM_OPS(dw_i2c_dev_pm_ops, dw_i2c_suspend,
+			    dw_i2c_resume, NULL);
+
 /* work with hotplug and coldplug */
 MODULE_ALIAS("platform:i2c_designware");
 
 static struct platform_driver dw_i2c_driver = {
-	.remove		= __devexit_p(dw_i2c_remove),
+	.probe = dw_i2c_probe,
+	.remove = dw_i2c_remove,
 	.driver		= {
 		.name	= "i2c_designware",
 		.owner	= THIS_MODULE,
 		.of_match_table = of_match_ptr(dw_i2c_of_match),
+		.acpi_match_table = ACPI_PTR(dw_i2c_acpi_match),
+		.pm	= &dw_i2c_dev_pm_ops,
 	},
 };
 
 static int __init dw_i2c_init_driver(void)
 {
-	return platform_driver_probe(&dw_i2c_driver, dw_i2c_probe);
+	return platform_driver_register(&dw_i2c_driver);
 }
-module_init(dw_i2c_init_driver);
+subsys_initcall(dw_i2c_init_driver);
 
 static void __exit dw_i2c_exit_driver(void)
 {