cregit-Linux how code gets into the kernel

Release 4.14 drivers/mfd/intel_quark_i2c_gpio.c

Directory: drivers/mfd
/*
 * Intel Quark MFD PCI driver for I2C & GPIO
 *
 * Copyright(c) 2014 Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope 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.
 *
 * Intel Quark PCI device for I2C and GPIO controller sharing the same
 * PCI function. This PCI driver will split the 2 devices into their
 * respective drivers.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/mfd/core.h>
#include <linux/clkdev.h>
#include <linux/clk-provider.h>
#include <linux/dmi.h>
#include <linux/platform_data/gpio-dwapb.h>
#include <linux/platform_data/i2c-designware.h>

/* PCI BAR for register base address */

#define MFD_I2C_BAR		0

#define MFD_GPIO_BAR		1

/* ACPI _ADR value to match the child node */

#define MFD_ACPI_MATCH_GPIO	0ULL

#define MFD_ACPI_MATCH_I2C	1ULL

/* The base GPIO number under GPIOLIB framework */

#define INTEL_QUARK_MFD_GPIO_BASE	8

/* The default number of South-Cluster GPIO on Quark. */

#define INTEL_QUARK_MFD_NGPIO		8

/* The DesignWare GPIO ports on Quark. */

#define INTEL_QUARK_GPIO_NPORTS	1


#define INTEL_QUARK_IORES_MEM	0

#define INTEL_QUARK_IORES_IRQ	1


#define INTEL_QUARK_I2C_CONTROLLER_CLK "i2c_designware.0"

/* The Quark I2C controller source clock */

#define INTEL_QUARK_I2C_CLK_HZ	33000000


struct intel_quark_mfd {
	
struct device		*dev;
	
struct clk		*i2c_clk;
	
struct clk_lookup	*i2c_clk_lookup;
};


static const struct dmi_system_id dmi_platform_info[] = {
	{
		.matches = {
			DMI_EXACT_MATCH(DMI_BOARD_NAME, "Galileo"),
                },
		.driver_data = (void *)100000,
        },
	{
		.matches = {
			DMI_EXACT_MATCH(DMI_BOARD_NAME, "GalileoGen2"),
                },
		.driver_data = (void *)400000,
        },
	{
		.matches = {
			DMI_EXACT_MATCH(DMI_BOARD_NAME, "SIMATIC IOT2000"),
			DMI_EXACT_MATCH(DMI_BOARD_ASSET_TAG,
					"6ES7647-0AA00-0YA2"),
                },
		.driver_data = (void *)400000,
        },
	{
		.matches = {
			DMI_EXACT_MATCH(DMI_BOARD_NAME, "SIMATIC IOT2000"),
			DMI_EXACT_MATCH(DMI_BOARD_ASSET_TAG,
					"6ES7647-0AA00-1YA2"),
                },
		.driver_data = (void *)400000,
        },
	{}
};


static struct resource intel_quark_i2c_res[] = {
	[INTEL_QUARK_IORES_MEM] = {
		.flags = IORESOURCE_MEM,
        },
	[INTEL_QUARK_IORES_IRQ] = {
		.flags = IORESOURCE_IRQ,
        },
};


static struct mfd_cell_acpi_match intel_quark_acpi_match_i2c = {
	.adr = MFD_ACPI_MATCH_I2C,
};


static struct resource intel_quark_gpio_res[] = {
	[INTEL_QUARK_IORES_MEM] = {
		.flags = IORESOURCE_MEM,
        },
};


static struct mfd_cell_acpi_match intel_quark_acpi_match_gpio = {
	.adr = MFD_ACPI_MATCH_GPIO,
};


static struct mfd_cell intel_quark_mfd_cells[] = {
	{
		.id = MFD_GPIO_BAR,
		.name = "gpio-dwapb",
		.acpi_match = &intel_quark_acpi_match_gpio,
		.num_resources = ARRAY_SIZE(intel_quark_gpio_res),
		.resources = intel_quark_gpio_res,
		.ignore_resource_conflicts = true,
        },
	{
		.id = MFD_I2C_BAR,
		.name = "i2c_designware",
		.acpi_match = &intel_quark_acpi_match_i2c,
		.num_resources = ARRAY_SIZE(intel_quark_i2c_res),
		.resources = intel_quark_i2c_res,
		.ignore_resource_conflicts = true,
        },
};


static const struct pci_device_id intel_quark_mfd_ids[] = {
	{ PCI_VDEVICE(INTEL, 0x0934), },
	{},
};
MODULE_DEVICE_TABLE(pci, intel_quark_mfd_ids);


static int intel_quark_register_i2c_clk(struct device *dev) { struct intel_quark_mfd *quark_mfd = dev_get_drvdata(dev); struct clk *i2c_clk; i2c_clk = clk_register_fixed_rate(dev, INTEL_QUARK_I2C_CONTROLLER_CLK, NULL, 0, INTEL_QUARK_I2C_CLK_HZ); if (IS_ERR(i2c_clk)) return PTR_ERR(i2c_clk); quark_mfd->i2c_clk = i2c_clk; quark_mfd->i2c_clk_lookup = clkdev_create(i2c_clk, NULL, INTEL_QUARK_I2C_CONTROLLER_CLK); if (!quark_mfd->i2c_clk_lookup) { clk_unregister(quark_mfd->i2c_clk); dev_err(dev, "Fixed clk register failed\n"); return -ENOMEM; } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Raymond Tan5856.31%120.00%
Stephen Boyd3231.07%240.00%
Andy Shevchenko1312.62%240.00%
Total103100.00%5100.00%


static void intel_quark_unregister_i2c_clk(struct device *dev) { struct intel_quark_mfd *quark_mfd = dev_get_drvdata(dev); if (!quark_mfd->i2c_clk_lookup) return; clkdev_drop(quark_mfd->i2c_clk_lookup); clk_unregister(quark_mfd->i2c_clk); }

Contributors

PersonTokensPropCommitsCommitProp
Raymond Tan4195.35%150.00%
Andy Shevchenko24.65%150.00%
Total43100.00%2100.00%


static int intel_quark_i2c_setup(struct pci_dev *pdev, struct mfd_cell *cell) { const struct dmi_system_id *dmi_id; struct dw_i2c_platform_data *pdata; struct resource *res = (struct resource *)cell->resources; struct device *dev = &pdev->dev; res[INTEL_QUARK_IORES_MEM].start = pci_resource_start(pdev, MFD_I2C_BAR); res[INTEL_QUARK_IORES_MEM].end = pci_resource_end(pdev, MFD_I2C_BAR); res[INTEL_QUARK_IORES_IRQ].start = pdev->irq; res[INTEL_QUARK_IORES_IRQ].end = pdev->irq; pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); if (!pdata) return -ENOMEM; /* Normal mode by default */ pdata->i2c_scl_freq = 100000; dmi_id = dmi_first_match(dmi_platform_info); if (dmi_id) pdata->i2c_scl_freq = (uintptr_t)dmi_id->driver_data; cell->platform_data = pdata; cell->pdata_size = sizeof(*pdata); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Raymond Tan15388.44%133.33%
Jan Kiszka148.09%133.33%
Andy Shevchenko63.47%133.33%
Total173100.00%3100.00%


static int intel_quark_gpio_setup(struct pci_dev *pdev, struct mfd_cell *cell) { struct dwapb_platform_data *pdata; struct resource *res = (struct resource *)cell->resources; struct device *dev = &pdev->dev; res[INTEL_QUARK_IORES_MEM].start = pci_resource_start(pdev, MFD_GPIO_BAR); res[INTEL_QUARK_IORES_MEM].end = pci_resource_end(pdev, MFD_GPIO_BAR); pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); if (!pdata) return -ENOMEM; /* For intel quark x1000, it has only one port: portA */ pdata->nports = INTEL_QUARK_GPIO_NPORTS; pdata->properties = devm_kcalloc(dev, pdata->nports, sizeof(*pdata->properties), GFP_KERNEL); if (!pdata->properties) return -ENOMEM; /* Set the properties for portA */ pdata->properties->fwnode = NULL; pdata->properties->idx = 0; pdata->properties->ngpio = INTEL_QUARK_MFD_NGPIO; pdata->properties->gpio_base = INTEL_QUARK_MFD_GPIO_BASE; pdata->properties->irq = pdev->irq; pdata->properties->irq_shared = true; cell->platform_data = pdata; cell->pdata_size = sizeof(*pdata); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Raymond Tan20799.52%150.00%
Jiang Qiu10.48%150.00%
Total208100.00%2100.00%


static int intel_quark_mfd_probe(struct pci_dev *pdev, const struct pci_device_id *id) { struct intel_quark_mfd *quark_mfd; int ret; ret = pcim_enable_device(pdev); if (ret) return ret; quark_mfd = devm_kzalloc(&pdev->dev, sizeof(*quark_mfd), GFP_KERNEL); if (!quark_mfd) return -ENOMEM; quark_mfd->dev = &pdev->dev; dev_set_drvdata(&pdev->dev, quark_mfd); ret = intel_quark_register_i2c_clk(&pdev->dev); if (ret) return ret; ret = intel_quark_i2c_setup(pdev, &intel_quark_mfd_cells[1]); if (ret) goto err_unregister_i2c_clk; ret = intel_quark_gpio_setup(pdev, &intel_quark_mfd_cells[0]); if (ret) goto err_unregister_i2c_clk; ret = mfd_add_devices(&pdev->dev, 0, intel_quark_mfd_cells, ARRAY_SIZE(intel_quark_mfd_cells), NULL, 0, NULL); if (ret) goto err_unregister_i2c_clk; return 0; err_unregister_i2c_clk: intel_quark_unregister_i2c_clk(&pdev->dev); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Raymond Tan14274.74%125.00%
Andy Shevchenko4825.26%375.00%
Total190100.00%4100.00%


static void intel_quark_mfd_remove(struct pci_dev *pdev) { intel_quark_unregister_i2c_clk(&pdev->dev); mfd_remove_devices(&pdev->dev); }

Contributors

PersonTokensPropCommitsCommitProp
Raymond Tan2488.89%150.00%
Andy Shevchenko311.11%150.00%
Total27100.00%2100.00%

static struct pci_driver intel_quark_mfd_driver = { .name = "intel_quark_mfd_i2c_gpio", .id_table = intel_quark_mfd_ids, .probe = intel_quark_mfd_probe, .remove = intel_quark_mfd_remove, }; module_pci_driver(intel_quark_mfd_driver); MODULE_AUTHOR("Raymond Tan <raymond.tan@intel.com>"); MODULE_DESCRIPTION("Intel Quark MFD PCI driver for I2C & GPIO"); MODULE_LICENSE("GPL v2");

Overall Contributors

PersonTokensPropCommitsCommitProp
Raymond Tan92177.66%19.09%
Andy Shevchenko13010.96%545.45%
Jan Kiszka1028.60%218.18%
Stephen Boyd322.70%218.18%
Jiang Qiu10.08%19.09%
Total1186100.00%11100.00%
Directory: drivers/mfd
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.