path: root/drivers/pinctrl/qcom/pinctrl-msm.c

/*
 * Copyright (c) 2013, Sony Mobile Communications AB.
 * Copyright (c) 2013, The Linux Foundation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that 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.
 */

#include <linux/delay.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pinctrl/machine.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinmux.h>
#include <linux/pinctrl/pinconf.h>
#include <linux/pinctrl/pinconf-generic.h>
#include <linux/slab.h>
#include <linux/gpio/driver.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/reboot.h>
#include <linux/pm.h>
#include <linux/log2.h>

#include "../core.h"
#include "../pinconf.h"
#include "pinctrl-msm.h"
#include "../pinctrl-utils.h"

#define MAX_NR_GPIO 300
#define MAX_NR_TILES 4
#define PS_HOLD_OFFSET 0x820

/**
 * struct msm_pinctrl - state for a pinctrl-msm device
 * @dev:            device handle.
 * @pctrl:          pinctrl handle.
 * @chip:           gpiochip handle.
 * @restart_nb:     restart notifier block.
 * @irq:            parent irq for the TLMM irq_chip.
 * @lock:           Spinlock to protect register resources as well
 *                  as msm_pinctrl data structures.
 * @enabled_irqs:   Bitmap of currently enabled irqs.
 * @dual_edge_irqs: Bitmap of irqs that need sw emulated dual edge
 *                  detection.
 * @soc;            Reference to soc_data of platform specific data.
 * @regs:           Base addresses for the TLMM tiles.
 */
struct msm_pinctrl {
	struct device *dev;
	struct pinctrl_dev *pctrl;
	struct gpio_chip chip;
	struct pinctrl_desc desc;
	struct notifier_block restart_nb;

	struct irq_chip irq_chip;
	int irq;

	raw_spinlock_t lock;

	DECLARE_BITMAP(dual_edge_irqs, MAX_NR_GPIO);
	DECLARE_BITMAP(enabled_irqs, MAX_NR_GPIO);

	const struct msm_pinctrl_soc_data *soc;
	void __iomem *regs[MAX_NR_TILES];
};

#define MSM_ACCESSOR(name) \
static u32 msm_readl_##name(struct msm_pinctrl *pctrl, \
			    const struct msm_pingroup *g) \
{ \
	return readl(pctrl->regs[g->tile] + g->name##_reg); \
} \
static void msm_writel_##name(u32 val, struct msm_pinctrl *pctrl, \
			      const struct msm_pingroup *g) \
{ \
	writel(val, pctrl->regs[g->tile] + g->name##_reg); \
}

MSM_ACCESSOR(ctl)
MSM_ACCESSOR(io)
MSM_ACCESSOR(intr_cfg)
MSM_ACCESSOR(intr_status)
MSM_ACCESSOR(intr_target)

static int msm_get_groups_count(struct pinctrl_dev *pctldev)
{
	struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);

	return pctrl->soc->ngroups;
}

static const char *msm_get_group_name(struct pinctrl_dev *pctldev,
				      unsigned group)
{
	struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);

	return pctrl->soc->groups[group].name;
}

static int msm_get_group_pins(struct pinctrl_dev *pctldev,
			      unsigned group,
			      const unsigned **pins,
			      unsigned *num_pins)
{
	struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);

	*pins = pctrl->soc->groups[group].pins;
	*num_pins = pctrl->soc->groups[group].npins;
	return 0;
}

static const struct pinctrl_ops msm_pinctrl_ops = {
	.get_groups_count	= msm_get_groups_count,
	.get_group_name		= msm_get_group_name,
	.get_group_pins		= msm_get_group_pins,
	.dt_node_to_map		= pinconf_generic_dt_node_to_map_group,
	.dt_free_map		= pinctrl_utils_free_map,
};

static int msm_pinmux_request(struct pinctrl_dev *pctldev, unsigned offset)
{
	struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
	struct gpio_chip *chip = &pctrl->chip;

	return gpiochip_line_is_valid(chip, offset) ? 0 : -EINVAL;
}

static int msm_get_functions_count(struct pinctrl_dev *pctldev)
{
	struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);

	return pctrl->soc->nfunctions;
}

static const char *msm_get_function_name(struct pinctrl_dev *pctldev,
					 unsigned function)
{
	struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);

	return pctrl->soc->functions[function].name;
}

static int msm_get_function_groups(struct pinctrl_dev *pctldev,
				   unsigned function,
				   const char * const **groups,
				   unsigned * const num_groups)
{
	struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);

	*