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/*
* 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
/* 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
#define INTEL_QUARK_I2C_NCLK 1
struct intel_quark_mfd {
struct pci_dev *pdev;
struct clk *i2c_clk;
struct clk_lookup *i2c_clk_lookup;
};
struct i2c_mode_info {
const char *name;
unsigned int i2c_scl_freq;
};
static const struct i2c_mode_info platform_i2c_mode_info[] = {
{
.name = "Galileo",
.i2c_scl_freq = 100000,
},
{
.name = "GalileoGen2",
.i2c_scl_freq = 400000,
},
{}
};
static struct resource intel_quark_i2c_res[] = {
[INTEL_QUARK_IORES_MEM] = {
.flags = IORESOURCE_MEM,
},
[INTEL_QUARK_IORES_IRQ] = {
.flags = IORESOURCE_IRQ,
},
};
static struct resource intel_quark_gpio_res[] = {
[INTEL_QUARK_IORES_MEM] = {
.flags = IORESOURCE_MEM,
},
};
static struct mfd_cell intel_quark_mfd_cells[] = {
{
.id = MFD_I2C_BAR,
.name = "i2c_designware",
.num_resources = ARRAY_SIZE(intel_quark_i2c_res),
.resources = intel_quark_i2c_res,
.ignore_resource_conflicts = true,
},
{
.id = MFD_GPIO_BAR,
.name = "gpio-dwapb",
.num_resources = ARRAY_SIZE(intel_quark_gpio_res),
.resources = intel_quark_gpio_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 intel_quark_mfd *quark_mfd)
{
struct pci_dev *pdev = quark_mfd->pdev;
struct clk_lookup *i2c_clk_lookup;
struct clk *i2c_clk;
int ret;
i2c_clk_lookup = devm_kcalloc(&pdev->dev, INTEL_QUARK_I2C_NCLK,
sizeof(*i2c_clk_lookup), GFP_KERNEL);
if (!i2c_clk_lookup)
return -ENOMEM;
i2c_clk_lookup[0].dev_id = INTEL_QUARK_I2C_CONTROLLER_CLK;
i2c_clk = clk_register_fixed_rate(&pdev->dev,
INTEL_QUARK_I2C_CONTROLLER_CLK, NULL,
CLK_IS_ROOT, INTEL_QUARK_I2C_CLK_HZ);
quark_mfd->i2c_clk_lookup = i2c_clk_lookup;
quark_mfd->i2c_clk = i2c_clk;
ret = clk_register_clkdevs(i2c_clk, i2c_clk_lookup,
INTEL_QUARK_I2C_NCLK);
if (ret)
dev_err(&pdev->dev, "Fixed clk register failed: %d\n", ret);
return ret;
}
static void intel_quark_unregister_i2c_clk(struct pci_dev *pdev)
{
struct intel_quark_mfd *quark_mfd = dev_get_drvdata(&pdev->dev);
if (!quark_mfd->i2c_clk || !quark_mfd->i2c_clk_lookup)
return;
clkdev_drop(quark_mfd->i2c_clk_lookup);
clk_unregister(quark_mfd->i2c_clk);
}
static int intel_quark_i2c_setup(struct pci_dev *pdev, struct mfd_cell *cell)
{
const char *board_name = dmi_get_system_info(DMI_BOARD_NAME);
const struct i2c_mode_info *info;
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;
if (board_name) {
for (info = platform_i2c_mode_info; info->name; info++) {
if (!strcmp(board_name, info->name)) {
pdata->i2c_scl_freq = info->i2c_scl_freq;
break;
}
}
}
cell->platform_data = pdata;
cell->pdata_size = sizeof(*pdata);
return 0;
}
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->node = NULL;
pdata->properties->name = "intel-quark-x1000-gpio-portA";
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;
}
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->pdev = pdev;
ret = intel_quark_register_i2c_clk(quark_mfd);
if (ret)
return ret;
dev_set_drvdata(&pdev->dev, quark_mfd);
ret = intel_quark_i2c_setup(pdev, &intel_quark_mfd_cells[MFD_I2C_BAR]);
if (ret)
return ret;
ret = intel_quark_gpio_setup(pdev,
&intel_quark_mfd_cells[MFD_GPIO_BAR]);
if (ret)
return ret;
return mfd_add_devices(&pdev->dev, 0, intel_quark_mfd_cells,
ARRAY_SIZE(intel_quark_mfd_cells), NULL, 0,
NULL);
}
static void intel_quark_mfd_remove(struct pci_dev *pdev)
{
intel_quark_unregister_i2c_clk(pdev);
mfd_remove_devices(&pdev->dev);
}
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");
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