/* * 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, 2015 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. * ---------------------------------------------------------------------------- * */ #include #include #include #include #include #include #include #include #include #include #include #include #include "i2c-designware-core.h" #define DRIVER_NAME "i2c-designware-pci" enum dw_pci_ctl_id_t { medfield_0, medfield_1, medfield_2, medfield_3, medfield_4, medfield_5, baytrail, haswell, }; struct dw_scl_sda_cfg { u32 ss_hcnt; u32 fs_hcnt; u32 ss_lcnt; u32 fs_lcnt; u32 sda_hold; }; struct dw_pci_controller { u32 bus_num; u32 bus_cfg; u32 tx_fifo_depth; u32 rx_fifo_depth; u32 clk_khz; u32 functionality; struct dw_scl_sda_cfg *scl_sda_cfg; }; #define INTEL_MID_STD_CFG (DW_IC_CON_MASTER | \ DW_IC_CON_SLAVE_DISABLE | \ DW_IC_CON_RESTART_EN) #define DW_DEFAULT_FUNCTIONALITY (I2C_FUNC_I2C | \ I2C_FUNC_SMBUS_BYTE | \ I2C_FUNC_SMBUS_BYTE_DATA | \ I2C_FUNC_SMBUS_WORD_DATA | \ I2C_FUNC_SMBUS_I2C_BLOCK) /* BayTrail HCNT/LCNT/SDA hold time */ static struct dw_scl_sda_cfg byt_config = { .ss_hcnt = 0x200, .fs_hcnt = 0x55, .ss_lcnt = 0x200, .fs_lcnt = 0x99, .sda_hold = 0x6, }; /* Haswell HCNT/LCNT/SDA hold time */ static struct dw_scl_sda_cfg hsw_config = { .ss_hcnt = 0x01b0, .fs_hcnt = 0x48, .ss_lcnt = 0x01fb, .fs_lcnt = 0xa0, .sda_hold = 0x9, }; static struct dw_pci_controller dw_pci_controllers[] = { [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, }, [baytrail] = { .bus_num = -1, .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST, .tx_fifo_depth = 32, .rx_fifo_depth = 32, .functionality = I2C_FUNC_10BIT_ADDR, .scl_sda_cfg = &byt_config, }, [haswell] = { .bus_num = -1, .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST, .tx_fifo_depth = 32, .rx_fifo_depth = 32, .functionality = I2C_FUNC_10BIT_ADDR, .scl_sda_cfg = &hsw_config, }, }; static struct i2c_algorithm i2c_dw_algo = { .master_xfer = i2c_dw_xfer, .functionality = i2c_dw_func, }; #ifdef CONFIG_PM static int i2c_dw_pci_suspend(struct device *dev) { struct pci_dev *pdev = container_of(dev, struct pci_dev, dev); i2c_dw_disable(pci_get_drvdata(pdev)); return 0; } static int i2c_dw_pci_resume(struct device *dev) { struct pci_dev *pdev = container_of(dev, struct pci_dev, dev); return i2c_dw_init(pci_get_drvdata(pdev)); } #endif static UNIVERSAL_DEV_PM_OPS(i2c_dw_pm_ops, i2c_dw_pci_suspend, i2c_dw_pci_resume, NULL); static u32 i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev) { return dev->controller->clk_khz; } static int i2c_dw_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) { struct dw_i2c_dev *dev; struct i2c_adapter *adap; int r; struct dw_pci_controller *controller; struct dw_scl_sda_cfg *cfg; if (id->driver_data >= ARRAY_SIZE(dw_pci_controllers)) { dev_err(&pdev->dev, "%s: invalid driver data %ld\n", __func__, id->driver_data); return -EINVAL; } controller = &dw_pci_controllers[id->driver_data]; r = pcim_enable_device(pdev); if (r) { dev_err(&pdev->dev, "Failed to enable I2C PCI device (%d)\n", r); return r; } r = pcim_iomap_regions(pdev, 1 << 0, pci_name(pdev)); if (r) { dev_err(&pdev->dev, "I/O memory remapping failed\n"); return r; } dev = devm_kzalloc(&pdev->dev, sizeof(struct dw_i2c_dev), GFP_KERNEL); if (!dev) return -ENOMEM; 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 = pcim_iomap_table(pdev)[0]; dev->dev = &pdev->dev; dev->functionality = controller->functionality | DW_DEFAULT_FUNCTIONALITY; dev->master_cfg = controller->bus_cfg; if (controller->scl_sda_cfg) { cfg = controller->scl_sda_cfg; dev->ss_hcnt = cfg->ss_hcnt; dev->fs_hcnt = cfg->fs_hcnt; dev->ss_lcnt = cfg->ss_lcnt; dev->fs_lcnt = cfg->fs_lcnt; dev->sda_hold_time = cfg->sda_hold; } 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) return r; 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"); r = devm_request_irq(&pdev->dev, pdev->irq, i2c_dw_isr, IRQF_SHARED, adap->name, dev); if (r) { dev_err(&pdev->dev, "failure requesting irq %i\n", dev->irq); return r; } 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"); return r; } pm_runtime_set_autosuspend_delay(&pdev->dev, 1000); pm_runtime_use_autosuspend(&pdev->dev); pm_runtime_put_autosuspend(&pdev->dev); pm_runtime_allow(&pdev->dev); return 0; } static void 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); i2c_del_adapter(&dev->adapter); } /* work with hotplug and coldplug */ MODULE_ALIAS("i2c_designware-pci"); static const struct pci_device_id i2_designware_pci_ids[] = { /* 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 }, /* Baytrail */ { PCI_VDEVICE(INTEL, 0x0F41), baytrail }, { PCI_VDEVICE(INTEL, 0x0F42), baytrail }, { PCI_VDEVICE(INTEL, 0x0F43), baytrail }, { PCI_VDEVICE(INTEL, 0x0F44), baytrail }, { PCI_VDEVICE(INTEL, 0x0F45), baytrail }, { PCI_VDEVICE(INTEL, 0x0F46), baytrail }, { PCI_VDEVICE(INTEL, 0x0F47), baytrail }, /* Haswell */ { PCI_VDEVICE(INTEL, 0x9c61), haswell }, { PCI_VDEVICE(INTEL, 0x9c62), haswell }, /* Braswell / Cherrytrail */ { PCI_VDEVICE(INTEL, 0x22C1), baytrail }, { PCI_VDEVICE(INTEL, 0x22C2), baytrail }, { PCI_VDEVICE(INTEL, 0x22C3), baytrail }, { PCI_VDEVICE(INTEL, 0x22C4), baytrail }, { PCI_VDEVICE(INTEL, 0x22C5), baytrail }, { PCI_VDEVICE(INTEL, 0x22C6), baytrail }, { PCI_VDEVICE(INTEL, 0x22C7), baytrail }, { 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 = i2c_dw_pci_remove, .driver = { .pm = &i2c_dw_pm_ops, }, }; module_pci_driver(dw_i2c_driver); MODULE_AUTHOR("Baruch Siach "); MODULE_DESCRIPTION("Synopsys DesignWare PCI I2C bus adapter"); MODULE_LICENSE("GPL");