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/*
* linux/drivers/pinctrl/pinctrl-pxa3xx.c
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* publishhed by the Free Software Foundation.
*
* Copyright (C) 2011, Marvell Technology Group Ltd.
*
* Author: Haojian Zhuang <haojian.zhuang@marvell.com>
*
*/
#include <linux/module.h>
#include <linux/device.h>
#include <linux/io.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include "pinctrl-pxa3xx.h"
static struct pinctrl_gpio_range pxa3xx_pinctrl_gpio_range = {
.name = "PXA3xx GPIO",
.id = 0,
.base = 0,
.pin_base = 0,
};
static int pxa3xx_get_groups_count(struct pinctrl_dev *pctrldev)
{
struct pxa3xx_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
return info->num_grps;
}
static const char *pxa3xx_get_group_name(struct pinctrl_dev *pctrldev,
unsigned selector)
{
struct pxa3xx_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
return info->grps[selector].name;
}
static int pxa3xx_get_group_pins(struct pinctrl_dev *pctrldev,
unsigned selector,
const unsigned **pins,
unsigned *num_pins)
{
struct pxa3xx_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
*pins = info->grps[selector].pins;
*num_pins = info->grps[selector].npins;
return 0;
}
static struct pinctrl_ops pxa3xx_pctrl_ops = {
.get_groups_count = pxa3xx_get_groups_count,
.get_group_name = pxa3xx_get_group_name,
.get_group_pins = pxa3xx_get_group_pins,
};
static int pxa3xx_pmx_get_funcs_count(struct pinctrl_dev *pctrldev)
{
struct pxa3xx_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
return info->num_funcs;
}
static const char *pxa3xx_pmx_get_func_name(struct pinctrl_dev *pctrldev,
unsigned func)
{
struct pxa3xx_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
return info->funcs[func].name;
}
static int pxa3xx_pmx_get_groups(struct pinctrl_dev *pctrldev, unsigned func,
const char * const **groups,
unsigned * const num_groups)
{
struct pxa3xx_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
*groups = info->funcs[func].groups;
*num_groups = info->funcs[func].num_groups;
return 0;
}
/* Return function number. If failure, return negative value. */
static int match_mux(struct pxa3xx_mfp_pin *mfp, unsigned mux)
{
int i;
for (i = 0; i < PXA3xx_MAX_MUX; i++) {
if (mfp->func[i] == mux)
break;
}
if (i >= PXA3xx_MAX_MUX)
return -EINVAL;
return i;
}
/* check whether current pin configuration is valid. Negative for failure */
static int match_group_mux(struct pxa3xx_pin_group *grp,
struct pxa3xx_pinmux_info *info,
unsigned mux)
{
int i, pin, ret = 0;
for (i = 0; i < grp->npins; i++) {
pin = grp->pins[i];
ret = match_mux(&info->mfp[pin], mux);
if (ret < 0) {
dev_err(info->dev, "Can't find mux %d on pin%d\n",
mux, pin);
break;
}
}
return ret;
}
static int pxa3xx_pmx_enable(struct pinctrl_dev *pctrldev, unsigned func,
unsigned group)
{
struct pxa3xx_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
struct pxa3xx_pin_group *pin_grp = &info->grps[group];
unsigned int data;
int i, mfpr, pin, pin_func;
if (!pin_grp->npins ||
(match_group_mux(pin_grp, info, pin_grp->mux) < 0)) {
dev_err(info->dev, "Failed to set the pin group: %d\n", group);
return -EINVAL;
}
for (i = 0; i < pin_grp->npins; i++) {
pin = pin_grp->pins[i];
pin_func = match_mux(&info->mfp[pin], pin_grp->mux);
mfpr = info->mfp[pin].mfpr;
data = readl_relaxed(info->virt_base + mfpr);
data &= ~MFPR_FUNC_MASK;
data |= pin_func;
writel_relaxed(data, info->virt_base + mfpr);
}
return 0;
}
static int pxa3xx_pmx_request_gpio(struct pinctrl_dev *pctrldev,
struct pinctrl_gpio_range *range,
unsigned pin)
{
struct pxa3xx_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
unsigned int data;
int pin_func, mfpr;
pin_func = match_mux(&info->mfp[pin], PXA3xx_MUX_GPIO);
if (pin_func < 0) {
dev_err(info->dev, "No GPIO function on pin%d (%s)\n",
pin, info->pads[pin].name);
return -EINVAL;
}
mfpr = info->mfp[pin].mfpr;
/* write gpio function into mfpr register */
data = readl_relaxed(info->virt_base + mfpr) & ~MFPR_FUNC_MASK;
data |= pin_func;
writel_relaxed(data, info->virt_base + mfpr);
return 0;
}
static struct pinmux_ops pxa3xx_pmx_ops = {
.get_functions_count = pxa3xx_pmx_get_funcs_count,
.get_function_name = pxa3xx_pmx_get_func_name,
.get_function_groups = pxa3xx_pmx_get_groups,
.enable = pxa3xx_pmx_enable,
.gpio_request_enable = pxa3xx_pmx_request_gpio,
};
int pxa3xx_pinctrl_register(struct platform_device *pdev,
struct pxa3xx_pinmux_info *info)
{
struct pinctrl_desc *desc;
struct resource *res;
if (!info || !info->cputype)
return -EINVAL;
desc = info->desc;
desc->pins = info->pads;
desc->npins = info->num_pads;
desc->pctlops = &pxa3xx_pctrl_ops;
desc->pmxops = &pxa3xx_pmx_ops;
info->dev = &pdev->dev;
pxa3xx_pinctrl_gpio_range.npins = info->num_gpio;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -ENOENT;
info->virt_base = devm_request_and_ioremap(&pdev->dev, res);
if (!info->virt_base)
return -ENOMEM;
info->pctrl = pinctrl_register(desc, &pdev->dev, info);
if (!info->pctrl) {
dev_err(&pdev->dev, "failed to register PXA pinmux driver\n");
return -EINVAL;
}
pinctrl_add_gpio_range(info->pctrl, &pxa3xx_pinctrl_gpio_range);
platform_set_drvdata(pdev, info);
return 0;
}
int pxa3xx_pinctrl_unregister(struct platform_device *pdev)
{
struct pxa3xx_pinmux_info *info = platform_get_drvdata(pdev);
pinctrl_unregister(info->pctrl);
platform_set_drvdata(pdev, NULL);
return 0;
}
static int __init pxa3xx_pinctrl_init(void)
{
pr_info("pxa3xx-pinctrl: PXA3xx pinctrl driver initializing\n");
return 0;
}
core_initcall_sync(pxa3xx_pinctrl_init);
static void __exit pxa3xx_pinctrl_exit(void)
{
}
module_exit(pxa3xx_pinctrl_exit);
MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
MODULE_DESCRIPTION("PXA3xx pin control driver");
MODULE_LICENSE("GPL v2");
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