12373f6b9SDirk Brandewie /* 22373f6b9SDirk Brandewie * Synopsys DesignWare I2C adapter driver (master only). 32373f6b9SDirk Brandewie * 42373f6b9SDirk Brandewie * Based on the TI DAVINCI I2C adapter driver. 52373f6b9SDirk Brandewie * 62373f6b9SDirk Brandewie * Copyright (C) 2006 Texas Instruments. 72373f6b9SDirk Brandewie * Copyright (C) 2007 MontaVista Software Inc. 82373f6b9SDirk Brandewie * Copyright (C) 2009 Provigent Ltd. 92373f6b9SDirk Brandewie * 102373f6b9SDirk Brandewie * ---------------------------------------------------------------------------- 112373f6b9SDirk Brandewie * 122373f6b9SDirk Brandewie * This program is free software; you can redistribute it and/or modify 132373f6b9SDirk Brandewie * it under the terms of the GNU General Public License as published by 142373f6b9SDirk Brandewie * the Free Software Foundation; either version 2 of the License, or 152373f6b9SDirk Brandewie * (at your option) any later version. 162373f6b9SDirk Brandewie * 172373f6b9SDirk Brandewie * This program is distributed in the hope that it will be useful, 182373f6b9SDirk Brandewie * but WITHOUT ANY WARRANTY; without even the implied warranty of 192373f6b9SDirk Brandewie * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 202373f6b9SDirk Brandewie * GNU General Public License for more details. 212373f6b9SDirk Brandewie * 222373f6b9SDirk Brandewie * You should have received a copy of the GNU General Public License 232373f6b9SDirk Brandewie * along with this program; if not, write to the Free Software 242373f6b9SDirk Brandewie * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 252373f6b9SDirk Brandewie * ---------------------------------------------------------------------------- 262373f6b9SDirk Brandewie * 272373f6b9SDirk Brandewie */ 282373f6b9SDirk Brandewie #include <linux/kernel.h> 292373f6b9SDirk Brandewie #include <linux/module.h> 302373f6b9SDirk Brandewie #include <linux/delay.h> 312373f6b9SDirk Brandewie #include <linux/i2c.h> 322373f6b9SDirk Brandewie #include <linux/clk.h> 332373f6b9SDirk Brandewie #include <linux/errno.h> 342373f6b9SDirk Brandewie #include <linux/sched.h> 352373f6b9SDirk Brandewie #include <linux/err.h> 362373f6b9SDirk Brandewie #include <linux/interrupt.h> 372373f6b9SDirk Brandewie #include <linux/platform_device.h> 382373f6b9SDirk Brandewie #include <linux/io.h> 392373f6b9SDirk Brandewie #include <linux/slab.h> 402373f6b9SDirk Brandewie #include "i2c-designware-core.h" 412373f6b9SDirk Brandewie 422373f6b9SDirk Brandewie static struct i2c_algorithm i2c_dw_algo = { 432373f6b9SDirk Brandewie .master_xfer = i2c_dw_xfer, 442373f6b9SDirk Brandewie .functionality = i2c_dw_func, 452373f6b9SDirk Brandewie }; 462373f6b9SDirk Brandewie 472373f6b9SDirk Brandewie static int __devinit dw_i2c_probe(struct platform_device *pdev) 482373f6b9SDirk Brandewie { 492373f6b9SDirk Brandewie struct dw_i2c_dev *dev; 502373f6b9SDirk Brandewie struct i2c_adapter *adap; 512373f6b9SDirk Brandewie struct resource *mem, *ioarea; 522373f6b9SDirk Brandewie int irq, r; 532373f6b9SDirk Brandewie 542373f6b9SDirk Brandewie /* NOTE: driver uses the static register mapping */ 552373f6b9SDirk Brandewie mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 562373f6b9SDirk Brandewie if (!mem) { 572373f6b9SDirk Brandewie dev_err(&pdev->dev, "no mem resource?\n"); 582373f6b9SDirk Brandewie return -EINVAL; 592373f6b9SDirk Brandewie } 602373f6b9SDirk Brandewie 612373f6b9SDirk Brandewie irq = platform_get_irq(pdev, 0); 622373f6b9SDirk Brandewie if (irq < 0) { 632373f6b9SDirk Brandewie dev_err(&pdev->dev, "no irq resource?\n"); 642373f6b9SDirk Brandewie return irq; /* -ENXIO */ 652373f6b9SDirk Brandewie } 662373f6b9SDirk Brandewie 672373f6b9SDirk Brandewie ioarea = request_mem_region(mem->start, resource_size(mem), 682373f6b9SDirk Brandewie pdev->name); 692373f6b9SDirk Brandewie if (!ioarea) { 702373f6b9SDirk Brandewie dev_err(&pdev->dev, "I2C region already claimed\n"); 712373f6b9SDirk Brandewie return -EBUSY; 722373f6b9SDirk Brandewie } 732373f6b9SDirk Brandewie 742373f6b9SDirk Brandewie dev = kzalloc(sizeof(struct dw_i2c_dev), GFP_KERNEL); 752373f6b9SDirk Brandewie if (!dev) { 762373f6b9SDirk Brandewie r = -ENOMEM; 772373f6b9SDirk Brandewie goto err_release_region; 782373f6b9SDirk Brandewie } 792373f6b9SDirk Brandewie 802373f6b9SDirk Brandewie init_completion(&dev->cmd_complete); 812373f6b9SDirk Brandewie mutex_init(&dev->lock); 822373f6b9SDirk Brandewie dev->dev = get_device(&pdev->dev); 832373f6b9SDirk Brandewie dev->irq = irq; 842373f6b9SDirk Brandewie platform_set_drvdata(pdev, dev); 852373f6b9SDirk Brandewie 862373f6b9SDirk Brandewie dev->clk = clk_get(&pdev->dev, NULL); 872373f6b9SDirk Brandewie if (IS_ERR(dev->clk)) { 882373f6b9SDirk Brandewie r = -ENODEV; 892373f6b9SDirk Brandewie goto err_free_mem; 902373f6b9SDirk Brandewie } 912373f6b9SDirk Brandewie clk_enable(dev->clk); 922373f6b9SDirk Brandewie 932373f6b9SDirk Brandewie dev->base = ioremap(mem->start, resource_size(mem)); 942373f6b9SDirk Brandewie if (dev->base == NULL) { 952373f6b9SDirk Brandewie dev_err(&pdev->dev, "failure mapping io resources\n"); 962373f6b9SDirk Brandewie r = -EBUSY; 972373f6b9SDirk Brandewie goto err_unuse_clocks; 982373f6b9SDirk Brandewie } 992373f6b9SDirk Brandewie { 1002373f6b9SDirk Brandewie u32 param1 = dw_readl(dev, DW_IC_COMP_PARAM_1); 1012373f6b9SDirk Brandewie 1022373f6b9SDirk Brandewie dev->tx_fifo_depth = ((param1 >> 16) & 0xff) + 1; 1032373f6b9SDirk Brandewie dev->rx_fifo_depth = ((param1 >> 8) & 0xff) + 1; 1042373f6b9SDirk Brandewie } 1052373f6b9SDirk Brandewie r = i2c_dw_init(dev); 1062373f6b9SDirk Brandewie if (r) 1072373f6b9SDirk Brandewie goto err_iounmap; 1082373f6b9SDirk Brandewie 1092373f6b9SDirk Brandewie dw_writel(dev, 0, DW_IC_INTR_MASK); /* disable IRQ */ 1102373f6b9SDirk Brandewie r = request_irq(dev->irq, i2c_dw_isr, IRQF_DISABLED, pdev->name, dev); 1112373f6b9SDirk Brandewie if (r) { 1122373f6b9SDirk Brandewie dev_err(&pdev->dev, "failure requesting irq %i\n", dev->irq); 1132373f6b9SDirk Brandewie goto err_iounmap; 1142373f6b9SDirk Brandewie } 1152373f6b9SDirk Brandewie 1162373f6b9SDirk Brandewie adap = &dev->adapter; 1172373f6b9SDirk Brandewie i2c_set_adapdata(adap, dev); 1182373f6b9SDirk Brandewie adap->owner = THIS_MODULE; 1192373f6b9SDirk Brandewie adap->class = I2C_CLASS_HWMON; 1202373f6b9SDirk Brandewie strlcpy(adap->name, "Synopsys DesignWare I2C adapter", 1212373f6b9SDirk Brandewie sizeof(adap->name)); 1222373f6b9SDirk Brandewie adap->algo = &i2c_dw_algo; 1232373f6b9SDirk Brandewie adap->dev.parent = &pdev->dev; 1242373f6b9SDirk Brandewie 1252373f6b9SDirk Brandewie adap->nr = pdev->id; 1262373f6b9SDirk Brandewie r = i2c_add_numbered_adapter(adap); 1272373f6b9SDirk Brandewie if (r) { 1282373f6b9SDirk Brandewie dev_err(&pdev->dev, "failure adding adapter\n"); 1292373f6b9SDirk Brandewie goto err_free_irq; 1302373f6b9SDirk Brandewie } 1312373f6b9SDirk Brandewie 1322373f6b9SDirk Brandewie return 0; 1332373f6b9SDirk Brandewie 1342373f6b9SDirk Brandewie err_free_irq: 1352373f6b9SDirk Brandewie free_irq(dev->irq, dev); 1362373f6b9SDirk Brandewie err_iounmap: 1372373f6b9SDirk Brandewie iounmap(dev->base); 1382373f6b9SDirk Brandewie err_unuse_clocks: 1392373f6b9SDirk Brandewie clk_disable(dev->clk); 1402373f6b9SDirk Brandewie clk_put(dev->clk); 1412373f6b9SDirk Brandewie dev->clk = NULL; 1422373f6b9SDirk Brandewie err_free_mem: 1432373f6b9SDirk Brandewie platform_set_drvdata(pdev, NULL); 1442373f6b9SDirk Brandewie put_device(&pdev->dev); 1452373f6b9SDirk Brandewie kfree(dev); 1462373f6b9SDirk Brandewie err_release_region: 1472373f6b9SDirk Brandewie release_mem_region(mem->start, resource_size(mem)); 1482373f6b9SDirk Brandewie 1492373f6b9SDirk Brandewie return r; 1502373f6b9SDirk Brandewie } 1512373f6b9SDirk Brandewie 1522373f6b9SDirk Brandewie static int __devexit dw_i2c_remove(struct platform_device *pdev) 1532373f6b9SDirk Brandewie { 1542373f6b9SDirk Brandewie struct dw_i2c_dev *dev = platform_get_drvdata(pdev); 1552373f6b9SDirk Brandewie struct resource *mem; 1562373f6b9SDirk Brandewie 1572373f6b9SDirk Brandewie platform_set_drvdata(pdev, NULL); 1582373f6b9SDirk Brandewie i2c_del_adapter(&dev->adapter); 1592373f6b9SDirk Brandewie put_device(&pdev->dev); 1602373f6b9SDirk Brandewie 1612373f6b9SDirk Brandewie clk_disable(dev->clk); 1622373f6b9SDirk Brandewie clk_put(dev->clk); 1632373f6b9SDirk Brandewie dev->clk = NULL; 1642373f6b9SDirk Brandewie 1652373f6b9SDirk Brandewie dw_writel(dev, 0, DW_IC_ENABLE); 1662373f6b9SDirk Brandewie free_irq(dev->irq, dev); 1672373f6b9SDirk Brandewie kfree(dev); 1682373f6b9SDirk Brandewie 1692373f6b9SDirk Brandewie mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1702373f6b9SDirk Brandewie release_mem_region(mem->start, resource_size(mem)); 1712373f6b9SDirk Brandewie return 0; 1722373f6b9SDirk Brandewie } 1732373f6b9SDirk Brandewie 1742373f6b9SDirk Brandewie /* work with hotplug and coldplug */ 1752373f6b9SDirk Brandewie MODULE_ALIAS("platform:i2c_designware"); 1762373f6b9SDirk Brandewie 1772373f6b9SDirk Brandewie static struct platform_driver dw_i2c_driver = { 1782373f6b9SDirk Brandewie .remove = __devexit_p(dw_i2c_remove), 1792373f6b9SDirk Brandewie .driver = { 1802373f6b9SDirk Brandewie .name = "i2c_designware", 1812373f6b9SDirk Brandewie .owner = THIS_MODULE, 1822373f6b9SDirk Brandewie }, 1832373f6b9SDirk Brandewie }; 1842373f6b9SDirk Brandewie 1852373f6b9SDirk Brandewie static int __init dw_i2c_init_driver(void) 1862373f6b9SDirk Brandewie { 1872373f6b9SDirk Brandewie return platform_driver_probe(&dw_i2c_driver, dw_i2c_probe); 1882373f6b9SDirk Brandewie } 1892373f6b9SDirk Brandewie module_init(dw_i2c_init_driver); 1902373f6b9SDirk Brandewie 1912373f6b9SDirk Brandewie static void __exit dw_i2c_exit_driver(void) 1922373f6b9SDirk Brandewie { 1932373f6b9SDirk Brandewie platform_driver_unregister(&dw_i2c_driver); 1942373f6b9SDirk Brandewie } 1952373f6b9SDirk Brandewie module_exit(dw_i2c_exit_driver); 1962373f6b9SDirk Brandewie 1972373f6b9SDirk Brandewie MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>"); 1982373f6b9SDirk Brandewie MODULE_DESCRIPTION("Synopsys DesignWare I2C bus adapter"); 1992373f6b9SDirk Brandewie MODULE_LICENSE("GPL"); 200