| /* |
| * 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/of_i2c.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 = { |
| .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; |
| } |
| |
| #ifdef CONFIG_ACPI |
| static int dw_i2c_acpi_configure(struct platform_device *pdev) |
| { |
| struct dw_i2c_dev *dev = platform_get_drvdata(pdev); |
| struct acpi_device *adev; |
| int busno, ret; |
| |
| if (!ACPI_HANDLE(&pdev->dev)) |
| return -ENODEV; |
| |
| ret = acpi_bus_get_device(ACPI_HANDLE(&pdev->dev), &adev); |
| if (ret) |
| return -ENODEV; |
| |
| dev->adapter.nr = -1; |
| if (adev->pnp.unique_id && !kstrtoint(adev->pnp.unique_id, 0, &busno)) |
| dev->adapter.nr = busno; |
| |
| dev->tx_fifo_depth = 32; |
| dev->rx_fifo_depth = 32; |
| return 0; |
| } |
| |
| static const struct acpi_device_id dw_i2c_acpi_match[] = { |
| { "INT33C2", 0 }, |
| { "INT33C3", 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; |
| 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; |
| } |
| |
| /* 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; |
| |
| i2c_dw_disable_int(dev); |
| r = request_irq(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; |
| } |
| |
| 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; |
| ACPI_HANDLE_SET(&adap->dev, ACPI_HANDLE(&pdev->dev)); |
| |
| 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); |
| acpi_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: |
| 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; |
| |
| 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), |
| .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); |
| } |
| 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 <baruch@tkos.co.il>"); |
| MODULE_DESCRIPTION("Synopsys DesignWare I2C bus adapter"); |
| MODULE_LICENSE("GPL"); |