1 files changed, 215 insertions, 0 deletions

diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c
new file mode 100644
index 000000000000..2d3657ab1258
--- /dev/null
+++ b/drivers/i2c/busses/i2c-designware-platdrv.c
@@ -0,0 +1,215 @@
+/*
+ * Synopsys DesignWare I2C adapter driver (master only).
+ *
+ * Based on the TI DAVINCI I2C adapter driver.
+ *
+ * Copyright (C) 2006 Texas Instruments.
+ * Copyright (C) 2007 MontaVista Software Inc.
+ * Copyright (C) 2009 Provigent Ltd.
+ *
+ * ----------------------------------------------------------------------------
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ * ----------------------------------------------------------------------------
+ *
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/clk.h>
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/err.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include "i2c-designware-core.h"
+
+static struct i2c_algorithm i2c_dw_algo = {
+        .master_xfer    = i2c_dw_xfer,
+        .functionality  = i2c_dw_func,
+};
+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)
+{
+        struct dw_i2c_dev *dev;
+        struct i2c_adapter *adap;
+        struct resource *mem, *ioarea;
+        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 = kzalloc(sizeof(struct dw_i2c_dev), GFP_KERNEL);
+        if (!dev) {
+                r = -ENOMEM;
+                goto err_release_region;
+        }
+
+        init_completion(&dev->cmd_complete);
+        mutex_init(&dev->lock);
+        dev->dev = get_device(&pdev->dev);
+        dev->irq = irq;
+        platform_set_drvdata(pdev, dev);
+
+        dev->clk = 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;
+        }
+        clk_enable(dev->clk);
+
+        dev->functionality =
+                I2C_FUNC_I2C |
+                I2C_FUNC_10BIT_ADDR |
+                I2C_FUNC_SMBUS_BYTE |
+                I2C_FUNC_SMBUS_BYTE_DATA |
+                I2C_FUNC_SMBUS_WORD_DATA |
+                I2C_FUNC_SMBUS_I2C_BLOCK;
+        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;
+        }
+        {
+                u32 param1 = i2c_dw_read_comp_param(dev);
+
+                dev->tx_fifo_depth = ((param1 >> 16) & 0xff) + 1;
+                dev->rx_fifo_depth = ((param1 >> 8)  & 0xff) + 1;
+        }
+        r = i2c_dw_init(dev);
+        if (r)
+                goto err_iounmap;
+
+        i2c_dw_disable_int(dev);
+        r = request_irq(dev->irq, i2c_dw_isr, IRQF_DISABLED, pdev->name, dev);
+        if (r) {
+                dev_err(&pdev->dev, "failure requesting irq %i\n", dev->irq);
+                goto err_iounmap;
+        }
+
+        adap = &dev->adapter;
+        i2c_set_adapdata(adap, dev);
+        adap->owner = THIS_MODULE;
+        adap->class = I2C_CLASS_HWMON;
+        strlcpy(adap->name, "Synopsys DesignWare I2C adapter",
+                        sizeof(adap->name));
+        adap->algo = &i2c_dw_algo;
+        adap->dev.parent = &pdev->dev;
+
+        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 0;
+
+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;
+}
+
+static int __devexit 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);
+
+        clk_disable(dev->clk);
+        clk_put(dev->clk);
+        dev->clk = NULL;
+
+        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));
+        return 0;
+}
+
+/* work with hotplug and coldplug */
+MODULE_ALIAS("platform:i2c_designware");
+
+static struct platform_driver dw_i2c_driver = {
+        .remove         = __devexit_p(dw_i2c_remove),
+        .driver         = {
+                .name   = "i2c_designware",
+                .owner  = THIS_MODULE,
+        },
+};
+
+static int __init dw_i2c_init_driver(void)
+{
+        return platform_driver_probe(&dw_i2c_driver, dw_i2c_probe);
+}
+module_init(dw_i2c_init_driver);
+
+static void __exit dw_i2c_exit_driver(void)
+{
+        platform_driver_unregister(&dw_i2c_driver);
+}
+module_exit(dw_i2c_exit_driver);
+
+MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>");
+MODULE_DESCRIPTION("Synopsys DesignWare I2C bus adapter");
+MODULE_LICENSE("GPL");