path: root/drivers/pcmcia/soc_common.c

/*======================================================================

    Common support code for the PCMCIA control functionality of
    integrated SOCs like the SA-11x0 and PXA2xx microprocessors.

    The contents of this file are subject to the Mozilla Public
    License Version 1.1 (the "License"); you may not use this file
    except in compliance with the License. You may obtain a copy of
    the License at http://www.mozilla.org/MPL/

    Software distributed under the License is distributed on an "AS
    IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
    implied. See the License for the specific language governing
    rights and limitations under the License.

    The initial developer of the original code is John G. Dorsey
    <john+@cs.cmu.edu>.  Portions created by John G. Dorsey are
    Copyright (C) 1999 John G. Dorsey.  All Rights Reserved.

    Alternatively, the contents of this file may be used under the
    terms of the GNU Public License version 2 (the "GPL"), in which
    case the provisions of the GPL are applicable instead of the
    above.  If you wish to allow the use of your version of this file
    only under the terms of the GPL and not to allow others to use
    your version of this file under the MPL, indicate your decision
    by deleting the provisions above and replace them with the notice
    and other provisions required by the GPL.  If you do not delete
    the provisions above, a recipient may use your version of this
    file under either the MPL or the GPL.

======================================================================*/


#include <linux/cpufreq.h>
#include <linux/gpio.h>
#include <linux/gpio/consumer.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/mutex.h>
#include <linux/regulator/consumer.h>
#include <linux/spinlock.h>
#include <linux/timer.h>

#include <mach/hardware.h>

#include "soc_common.h"

static irqreturn_t soc_common_pcmcia_interrupt(int irq, void *dev);

#ifdef CONFIG_PCMCIA_DEBUG

static int pc_debug;
module_param(pc_debug, int, 0644);

void soc_pcmcia_debug(struct soc_pcmcia_socket *skt, const char *func,
		      int lvl, const char *fmt, ...)
{
	struct va_format vaf;
	va_list args;
	if (pc_debug > lvl) {
		va_start(args, fmt);

		vaf.fmt = fmt;
		vaf.va = &args;

		printk(KERN_DEBUG "skt%u: %s: %pV", skt->nr, func, &vaf);

		va_end(args);
	}
}
EXPORT_SYMBOL(soc_pcmcia_debug);

#endif

#define to_soc_pcmcia_socket(x)	\
	container_of(x, struct soc_pcmcia_socket, socket)

int soc_pcmcia_regulator_set(struct soc_pcmcia_socket *skt,
	struct soc_pcmcia_regulator *r, int v)
{
	bool on;
	int ret;

	if (!r->reg)
		return 0;

	on = v != 0;
	if (r->on == on)
		return 0;

	if (on) {
		ret = regulator_set_voltage(r->reg, v * 100000, v * 100000);
		if (ret) {
			int vout = regulator_get_voltage(r->reg) / 100000;

			dev_warn(&skt->socket.dev,
				 "CS requested %s=%u.%uV, applying %u.%uV\n",
				 r == &skt->vcc ? "Vcc" : "Vpp",
				 v / 10, v % 10, vout / 10, vout % 10);
		}

		ret = regulator_enable(r->reg);
	} else {
		ret = regulator_disable(r->reg);
	}
	if (ret == 0)
		r->on = on;

	return ret;
}
EXPORT_SYMBOL_GPL(soc_pcmcia_regulator_set);

static unsigned short
calc_speed(unsigned short *spds, int num, unsigned short dflt)
{
	unsigned short speed = 0;
	int i;

	for (i = 0; i < num; i++)
		if (speed < spds[i])
			speed = spds[i];
	if (speed == 0)
		speed = dflt;

	return speed;
}

void soc_common_pcmcia_get_timing(struct soc_pcmcia_socket *skt,
	struct soc_pcmcia_timing *timing)
{
	timing->io =
		calc_speed(skt->spd_io, MAX_IO_WIN, SOC_PCMCIA_IO_ACCESS);
	timing->mem =
		calc_speed(skt->spd_mem, MAX_WIN, SOC_PCMCIA_3V_MEM_ACCESS);
	timing->attr =
		calc_speed(skt->spd_attr, MAX_WIN, SOC_PCMCIA_3V_MEM_ACCESS);
}
EXPORT_SYMBOL(soc_common_pcmcia_get_timing);

static void __soc_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt,
	unsigned int nr)
{
	unsigned int i;

	for (i = 0; i < nr; i++)
		if (skt->stat[i].irq)
			free_irq(skt->stat[i].irq, skt);

	if (skt->ops->hw_shutdown)
		skt->ops->hw_shutdown(skt);

	clk_disable_unprepare(skt->clk);
}

static void soc_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
{
	__soc_pcmcia_hw_shutdown(skt, ARRAY_SIZE(skt->stat));
}

int soc_pcmcia_request_gpiods(struct soc_pcmcia_socket *skt)
{
	struct device *dev = skt->socket.dev.parent;
	struct gpio_desc *desc;
	int i;

	for (i = 0; i < ARRAY_SIZE(skt->stat); i++) {
		if (!skt->stat[i].name)
			continue;

		desc = devm_gpiod_get(dev, skt->stat[i].name, GPIOD_IN);
		if (IS_ERR(desc)) {
			dev_err(dev, "Failed to get GPIO for %s: %ld\n