/* * 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. * Copyright (C) 2011 Intel corporation. * * ---------------------------------------------------------------------------- * * 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/errno.h> #include <linux/sched.h> #include <linux/err.h> #include <linux/interrupt.h> #include <linux/io.h> #include <linux/slab.h> #include <linux/pci.h> #include <linux/pm_runtime.h> #include "i2c-designware-core.h" #define DRIVER_NAME "i2c-designware-pci" enum dw_pci_ctl_id_t { moorestown_0, moorestown_1, moorestown_2, medfield_0, medfield_1, medfield_2, medfield_3, medfield_4, medfield_5, }; struct dw_pci_controller { u32 bus_num; u32 bus_cfg; u32 tx_fifo_depth; u32 rx_fifo_depth; u32 clk_khz; }; #define INTEL_MID_STD_CFG (DW_IC_CON_MASTER | \ DW_IC_CON_SLAVE_DISABLE | \ DW_IC_CON_RESTART_EN) static struct dw_pci_controller dw_pci_controllers[] = { [moorestown_0] = { .bus_num = 0, .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST, .tx_fifo_depth = 32, .rx_fifo_depth = 32, .clk_khz = 25000, }, [moorestown_1] = { .bus_num = 1, .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST, .tx_fifo_depth = 32, .rx_fifo_depth = 32, .clk_khz = 25000, }, [moorestown_2] = { .bus_num = 2, .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST, .tx_fifo_depth = 32, .rx_fifo_depth = 32, .clk_khz = 25000, }, [medfield_0] = { .bus_num = 0, .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST, .tx_fifo_depth = 32, .rx_fifo_depth = 32, .clk_khz = 25000, }, [medfield_1] = { .bus_num = 1, .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST, .tx_fifo_depth = 32, .rx_fifo_depth = 32, .clk_khz = 25000, }, [medfield_2] = { .bus_num = 2, .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST, .tx_fifo_depth = 32, .rx_fifo_depth = 32, .clk_khz = 25000, }, [medfield_3] = { .bus_num = 3, .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_STD, .tx_fifo_depth = 32, .rx_fifo_depth = 32, .clk_khz = 25000, }, [medfield_4] = { .bus_num = 4, .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST, .tx_fifo_depth = 32, .rx_fifo_depth = 32, .clk_khz = 25000, }, [medfield_5] = { .bus_num = 5, .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST, .tx_fifo_depth = 32, .rx_fifo_depth = 32, .clk_khz = 25000, }, }; static struct i2c_algorithm i2c_dw_algo = { .master_xfer = i2c_dw_xfer, .functionality = i2c_dw_func, }; static int i2c_dw_pci_suspend(struct device *dev) { struct pci_dev *pdev = container_of(dev, struct pci_dev, dev); struct dw_i2c_dev *i2c = pci_get_drvdata(pdev); int err; i2c_dw_disable(i2c); err = pci_save_state(pdev); if (err) { dev_err(&pdev->dev, "pci_save_state failed\n"); return err; } err = pci_set_power_state(pdev, PCI_D3hot); if (err) { dev_err(&pdev->dev, "pci_set_power_state failed\n"); return err; } return 0; } static int i2c_dw_pci_resume(struct device *dev) { struct pci_dev *pdev = container_of(dev, struct pci_dev, dev); struct dw_i2c_dev *i2c = pci_get_drvdata(pdev); int err; u32 enabled; enabled = i2c_dw_is_enabled(i2c); if (enabled) return 0; err = pci_set_power_state(pdev, PCI_D0); if (err) { dev_err(&pdev->dev, "pci_set_power_state() failed\n"); return err; } pci_restore_state(pdev); i2c_dw_init(i2c); return 0; } static int i2c_dw_pci_runtime_idle(struct device *dev) { int err = pm_schedule_suspend(dev, 500); dev_dbg(dev, "runtime_idle called\n"); if (err != 0) return 0; return -EBUSY; } static const struct dev_pm_ops i2c_dw_pm_ops = { .resume = i2c_dw_pci_resume, .suspend = i2c_dw_pci_suspend, SET_RUNTIME_PM_OPS(i2c_dw_pci_suspend, i2c_dw_pci_resume, i2c_dw_pci_runtime_idle) }; static u32 i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev) { return dev->controller->clk_khz; } static int __devinit i2c_dw_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) { struct dw_i2c_dev *dev; struct i2c_adapter *adap; unsigned long start, len; void __iomem *base; int r; struct dw_pci_controller *controller; if (id->driver_data >= ARRAY_SIZE(dw_pci_controllers)) { printk(KERN_ERR "dw_i2c_pci_probe: invalid driver data %ld\n", id->driver_data); return -EINVAL; } controller = &dw_pci_controllers[id->driver_data]; r = pci_enable_device(pdev); if (r) { dev_err(&pdev->dev, "Failed to enable I2C PCI device (%d)\n", r); goto exit; } /* Determine the address of the I2C area */ start = pci_resource_start(pdev, 0); len = pci_resource_len(pdev, 0); if (!start || len == 0) { dev_err(&pdev->dev, "base address not set\n"); r = -ENODEV; goto exit; } r = pci_request_region(pdev, 0, DRIVER_NAME); if (r) { dev_err(&pdev->dev, "failed to request I2C region " "0x%lx-0x%lx\n", start, (unsigned long)pci_resource_end(pdev, 0)); goto exit; } base = ioremap_nocache(start, len); if (!base) { dev_err(&pdev->dev, "I/O memory remapping failed\n"); r = -ENOMEM; goto err_release_region; } 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->clk = NULL; dev->controller = controller; dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz; dev->base = base; dev->dev = get_device(&pdev->dev); dev->functionality = I2C_FUNC_I2C | I2C_FUNC_SMBUS_BYTE | I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA | I2C_FUNC_SMBUS_I2C_BLOCK; dev->master_cfg = controller->bus_cfg; pci_set_drvdata(pdev, dev); dev->tx_fifo_depth = controller->tx_fifo_depth; dev->rx_fifo_depth = controller->rx_fifo_depth; r = i2c_dw_init(dev); if (r) goto err_iounmap; adap = &dev->adapter; i2c_set_adapdata(adap, dev); adap->owner = THIS_MODULE; adap->class = 0; adap->algo = &i2c_dw_algo; adap->dev.parent = &pdev->dev; adap->nr = controller->bus_num; snprintf(adap->name, sizeof(adap->name), "i2c-designware-pci-%d", adap->nr); r = request_irq(pdev->irq, i2c_dw_isr, IRQF_SHARED, adap->name, dev); if (r) { dev_err(&pdev->dev, "failure requesting irq %i\n", dev->irq); goto err_iounmap; } i2c_dw_disable_int(dev); i2c_dw_clear_int(dev); r = i2c_add_numbered_adapter(adap); if (r) { dev_err(&pdev->dev, "failure adding adapter\n"); goto err_free_irq; } pm_runtime_put_noidle(&pdev->dev); pm_runtime_allow(&pdev->dev); return 0; err_free_irq: free_irq(pdev->irq, dev); err_iounmap: iounmap(dev->base); pci_set_drvdata(pdev, NULL); put_device(&pdev->dev); kfree(dev); err_release_region: pci_release_region(pdev, 0); exit: return r; } static void __devexit i2c_dw_pci_remove(struct pci_dev *pdev) { struct dw_i2c_dev *dev = pci_get_drvdata(pdev); i2c_dw_disable(dev); pm_runtime_forbid(&pdev->dev); pm_runtime_get_noresume(&pdev->dev); pci_set_drvdata(pdev, NULL); i2c_del_adapter(&dev->adapter); put_device(&pdev->dev); free_irq(dev->irq, dev); kfree(dev); pci_release_region(pdev, 0); } /* work with hotplug and coldplug */ MODULE_ALIAS("i2c_designware-pci"); static DEFINE_PCI_DEVICE_TABLE(i2_designware_pci_ids) = { /* Moorestown */ { PCI_VDEVICE(INTEL, 0x0802), moorestown_0 }, { PCI_VDEVICE(INTEL, 0x0803), moorestown_1 }, { PCI_VDEVICE(INTEL, 0x0804), moorestown_2 }, /* Medfield */ { PCI_VDEVICE(INTEL, 0x0817), medfield_3,}, { PCI_VDEVICE(INTEL, 0x0818), medfield_4 }, { PCI_VDEVICE(INTEL, 0x0819), medfield_5 }, { PCI_VDEVICE(INTEL, 0x082C), medfield_0 }, { PCI_VDEVICE(INTEL, 0x082D), medfield_1 }, { PCI_VDEVICE(INTEL, 0x082E), medfield_2 }, { 0,} }; MODULE_DEVICE_TABLE(pci, i2_designware_pci_ids); static struct pci_driver dw_i2c_driver = { .name = DRIVER_NAME, .id_table = i2_designware_pci_ids, .probe = i2c_dw_pci_probe, .remove = __devexit_p(i2c_dw_pci_remove), .driver = { .pm = &i2c_dw_pm_ops, }, }; module_pci_driver(dw_i2c_driver); MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>"); MODULE_DESCRIPTION("Synopsys DesignWare PCI I2C bus adapter"); MODULE_LICENSE("GPL");