| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * 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, 2016 Intel Corporation. |
| */ |
| #include <linux/acpi.h> |
| #include <linux/delay.h> |
| #include <linux/err.h> |
| #include <linux/errno.h> |
| #include <linux/i2c.h> |
| #include <linux/interrupt.h> |
| #include <linux/io.h> |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/pci.h> |
| #include <linux/pm_runtime.h> |
| #include <linux/sched.h> |
| #include <linux/slab.h> |
| |
| #include "i2c-designware-core.h" |
| |
| #define DRIVER_NAME "i2c-designware-pci" |
| |
| enum dw_pci_ctl_id_t { |
| medfield, |
| merrifield, |
| baytrail, |
| cherrytrail, |
| haswell, |
| elkhartlake, |
| }; |
| |
| 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 flags; |
| struct dw_scl_sda_cfg *scl_sda_cfg; |
| int (*setup)(struct pci_dev *pdev, struct dw_pci_controller *c); |
| u32 (*get_clk_rate_khz)(struct dw_i2c_dev *dev); |
| }; |
| |
| /* Merrifield HCNT/LCNT/SDA hold time */ |
| static struct dw_scl_sda_cfg mrfld_config = { |
| .ss_hcnt = 0x2f8, |
| .fs_hcnt = 0x87, |
| .ss_lcnt = 0x37b, |
| .fs_lcnt = 0x10a, |
| }; |
| |
| /* 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 u32 mfld_get_clk_rate_khz(struct dw_i2c_dev *dev) |
| { |
| return 25000; |
| } |
| |
| static int mfld_setup(struct pci_dev *pdev, struct dw_pci_controller *c) |
| { |
| struct dw_i2c_dev *dev = dev_get_drvdata(&pdev->dev); |
| |
| switch (pdev->device) { |
| case 0x0817: |
| dev->timings.bus_freq_hz = I2C_MAX_STANDARD_MODE_FREQ; |
| fallthrough; |
| case 0x0818: |
| case 0x0819: |
| c->bus_num = pdev->device - 0x817 + 3; |
| return 0; |
| case 0x082C: |
| case 0x082D: |
| case 0x082E: |
| c->bus_num = pdev->device - 0x82C + 0; |
| return 0; |
| } |
| return -ENODEV; |
| } |
| |
| static int mrfld_setup(struct pci_dev *pdev, struct dw_pci_controller *c) |
| { |
| /* |
| * On Intel Merrifield the user visible i2c buses are enumerated |
| * [1..7]. So, we add 1 to shift the default range. Besides that the |
| * first PCI slot provides 4 functions, that's why we have to add 0 to |
| * the first slot and 4 to the next one. |
| */ |
| switch (PCI_SLOT(pdev->devfn)) { |
| case 8: |
| c->bus_num = PCI_FUNC(pdev->devfn) + 0 + 1; |
| return 0; |
| case 9: |
| c->bus_num = PCI_FUNC(pdev->devfn) + 4 + 1; |
| return 0; |
| } |
| return -ENODEV; |
| } |
| |
| static u32 ehl_get_clk_rate_khz(struct dw_i2c_dev *dev) |
| { |
| return 100000; |
| } |
| |
| static struct dw_pci_controller dw_pci_controllers[] = { |
| [medfield] = { |
| .bus_num = -1, |
| .setup = mfld_setup, |
| .get_clk_rate_khz = mfld_get_clk_rate_khz, |
| }, |
| [merrifield] = { |
| .bus_num = -1, |
| .scl_sda_cfg = &mrfld_config, |
| .setup = mrfld_setup, |
| }, |
| [baytrail] = { |
| .bus_num = -1, |
| .scl_sda_cfg = &byt_config, |
| }, |
| [haswell] = { |
| .bus_num = -1, |
| .scl_sda_cfg = &hsw_config, |
| }, |
| [cherrytrail] = { |
| .bus_num = -1, |
| .scl_sda_cfg = &byt_config, |
| }, |
| [elkhartlake] = { |
| .bus_num = -1, |
| .get_clk_rate_khz = ehl_get_clk_rate_khz, |
| }, |
| }; |
| |
| #ifdef CONFIG_PM |
| static int i2c_dw_pci_suspend(struct device *dev) |
| { |
| struct dw_i2c_dev *i_dev = dev_get_drvdata(dev); |
| |
| i_dev->suspended = true; |
| i_dev->disable(i_dev); |
| |
| return 0; |
| } |
| |
| static int i2c_dw_pci_resume(struct device *dev) |
| { |
| struct dw_i2c_dev *i_dev = dev_get_drvdata(dev); |
| int ret; |
| |
| ret = i_dev->init(i_dev); |
| i_dev->suspended = false; |
| |
| return ret; |
| } |
| #endif |
| |
| static UNIVERSAL_DEV_PM_OPS(i2c_dw_pm_ops, i2c_dw_pci_suspend, |
| i2c_dw_pci_resume, NULL); |
| |
| 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; |
| } |
| |
| pci_set_master(pdev); |
| |
| 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; |
| |
| r = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_ALL_TYPES); |
| if (r < 0) |
| return r; |
| |
| dev->get_clk_rate_khz = controller->get_clk_rate_khz; |
| dev->timings.bus_freq_hz = I2C_MAX_FAST_MODE_FREQ; |
| dev->base = pcim_iomap_table(pdev)[0]; |
| dev->dev = &pdev->dev; |
| dev->irq = pci_irq_vector(pdev, 0); |
| dev->flags |= controller->flags; |
| |
| pci_set_drvdata(pdev, dev); |
| |
| if (controller->setup) { |
| r = controller->setup(pdev, controller); |
| if (r) { |
| pci_free_irq_vectors(pdev); |
| return r; |
| } |
| } |
| |
| i2c_dw_adjust_bus_speed(dev); |
| |
| if (has_acpi_companion(&pdev->dev)) |
| i2c_dw_acpi_configure(&pdev->dev); |
| |
| r = i2c_dw_validate_speed(dev); |
| if (r) { |
| pci_free_irq_vectors(pdev); |
| return r; |
| } |
| |
| i2c_dw_configure(dev); |
| |
| 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; |
| } |
| |
| adap = &dev->adapter; |
| adap->owner = THIS_MODULE; |
| adap->class = 0; |
| ACPI_COMPANION_SET(&adap->dev, ACPI_COMPANION(&pdev->dev)); |
| adap->nr = controller->bus_num; |
| |
| r = i2c_dw_probe(dev); |
| if (r) { |
| pci_free_irq_vectors(pdev); |
| 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); |
| |
| dev->disable(dev); |
| pm_runtime_forbid(&pdev->dev); |
| pm_runtime_get_noresume(&pdev->dev); |
| |
| i2c_del_adapter(&dev->adapter); |
| devm_free_irq(&pdev->dev, dev->irq, dev); |
| pci_free_irq_vectors(pdev); |
| } |
| |
| /* 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 }, |
| { PCI_VDEVICE(INTEL, 0x0818), medfield }, |
| { PCI_VDEVICE(INTEL, 0x0819), medfield }, |
| { PCI_VDEVICE(INTEL, 0x082C), medfield }, |
| { PCI_VDEVICE(INTEL, 0x082D), medfield }, |
| { PCI_VDEVICE(INTEL, 0x082E), medfield }, |
| /* Merrifield */ |
| { PCI_VDEVICE(INTEL, 0x1195), merrifield }, |
| { PCI_VDEVICE(INTEL, 0x1196), merrifield }, |
| /* 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), cherrytrail }, |
| { PCI_VDEVICE(INTEL, 0x22C2), cherrytrail }, |
| { PCI_VDEVICE(INTEL, 0x22C3), cherrytrail }, |
| { PCI_VDEVICE(INTEL, 0x22C4), cherrytrail }, |
| { PCI_VDEVICE(INTEL, 0x22C5), cherrytrail }, |
| { PCI_VDEVICE(INTEL, 0x22C6), cherrytrail }, |
| { PCI_VDEVICE(INTEL, 0x22C7), cherrytrail }, |
| /* Elkhart Lake (PSE I2C) */ |
| { PCI_VDEVICE(INTEL, 0x4bb9), elkhartlake }, |
| { PCI_VDEVICE(INTEL, 0x4bba), elkhartlake }, |
| { PCI_VDEVICE(INTEL, 0x4bbb), elkhartlake }, |
| { PCI_VDEVICE(INTEL, 0x4bbc), elkhartlake }, |
| { PCI_VDEVICE(INTEL, 0x4bbd), elkhartlake }, |
| { PCI_VDEVICE(INTEL, 0x4bbe), elkhartlake }, |
| { PCI_VDEVICE(INTEL, 0x4bbf), elkhartlake }, |
| { PCI_VDEVICE(INTEL, 0x4bc0), elkhartlake }, |
| { 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 <baruch@tkos.co.il>"); |
| MODULE_DESCRIPTION("Synopsys DesignWare PCI I2C bus adapter"); |
| MODULE_LICENSE("GPL"); |