/* * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #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 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_prepare_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->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; } of_i2c_register_devices(adap); pm_runtime_set_active(&pdev->dev); pm_runtime_enable(&pdev->dev); pm_runtime_put(&pdev->dev); return 0; err_free_irq: free_irq(dev->irq, dev); err_iounmap: iounmap(dev->base); err_unuse_clocks: clk_disable_unprepare(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 dw_i2c_remove(struct platform_device *pdev) { struct dw_i2c_dev *dev = platform_get_drvdata(pdev); struct resource *mem; platform_set_drvdata(pdev, NULL); pm_runtime_get_sync(&pdev->dev); i2c_del_adapter(&dev->adapter); put_device(&pdev->dev); clk_disable_unprepare(dev->clk); clk_put(dev->clk); dev->clk = NULL; i2c_dw_disable(dev); free_irq(dev->irq, dev); kfree(dev); pm_runtime_put(&pdev->dev); pm_runtime_disable(&pdev->dev); mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); release_mem_region(mem->start, resource_size(mem)); return 0; } #ifdef CONFIG_OF static const struct of_device_id dw_i2c_of_match[] = { { .compatible = "snps,designware-i2c", }, {}, }; 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); 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 SIMPLE_DEV_PM_OPS(dw_i2c_dev_pm_ops, dw_i2c_suspend, dw_i2c_resume); /* work with hotplug and coldplug */ MODULE_ALIAS("platform:i2c_designware"); static struct platform_driver dw_i2c_driver = { .remove = dw_i2c_remove, .driver = { .name = "i2c_designware", .owner = THIS_MODULE, .of_match_table = of_match_ptr(dw_i2c_of_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); } subsys_initcall(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 "); MODULE_DESCRIPTION("Synopsys DesignWare I2C bus adapter"); MODULE_LICENSE("GPL");