forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
288 lines
7.1 KiB
288 lines
7.1 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* |
|
* Intel Quark MFD PCI driver for I2C & GPIO |
|
* |
|
* Copyright(c) 2014 Intel Corporation. |
|
* |
|
* 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"), |
|
}, |
|
.driver_data = (void *)400000, |
|
}, |
|
{} |
|
}; |
|
|
|
/* This is used as a place holder and will be modified at run-time */ |
|
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, |
|
}; |
|
|
|
/* This is used as a place holder and will be modified at run-time */ |
|
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; |
|
} |
|
|
|
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); |
|
} |
|
|
|
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; |
|
} |
|
|
|
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[0] = 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->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; |
|
} |
|
|
|
static void intel_quark_mfd_remove(struct pci_dev *pdev) |
|
{ |
|
intel_quark_unregister_i2c_clk(&pdev->dev); |
|
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 <[email protected]>"); |
|
MODULE_DESCRIPTION("Intel Quark MFD PCI driver for I2C & GPIO"); |
|
MODULE_LICENSE("GPL v2");
|
|
|