path: root/drivers/mmc/host/tmio_mmc_pio.c

/*
 * linux/drivers/mmc/host/tmio_mmc_pio.c
 *
 * Copyright (C) 2011 Guennadi Liakhovetski
 * Copyright (C) 2007 Ian Molton
 * Copyright (C) 2004 Ian Molton
 *
 * 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
 * published by the Free Software Foundation.
 *
 * Driver for the MMC / SD / SDIO IP found in:
 *
 * TC6393XB, TC6391XB, TC6387XB, T7L66XB, ASIC3, SH-Mobile SoCs
 *
 * This driver draws mainly on scattered spec sheets, Reverse engineering
 * of the toshiba e800  SD driver and some parts of the 2.4 ASIC3 driver (4 bit
 * support). (Further 4 bit support from a later datasheet).
 *
 * TODO:
 *   Investigate using a workqueue for PIO transfers
 *   Eliminate FIXMEs
 *   SDIO support
 *   Better Power management
 *   Handle MMC errors better
 *   double buffer support
 *
 */

#include <linux/delay.h>
#include <linux/device.h>
#include <linux/highmem.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/mfd/tmio.h>
#include <linux/mmc/host.h>
#include <linux/mmc/tmio.h>
#include <linux/module.h>
#include <linux/pagemap.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/scatterlist.h>
#include <linux/workqueue.h>
#include <linux/spinlock.h>

#include "tmio_mmc.h"

static u16 sd_ctrl_read16(struct tmio_mmc_host *host, int addr)
{
	return readw(host->ctl + (addr << host->bus_shift));
}

static void sd_ctrl_read16_rep(struct tmio_mmc_host *host, int addr,
		u16 *buf, int count)
{
	readsw(host->ctl + (addr << host->bus_shift), buf, count);
}

static u32 sd_ctrl_read32(struct tmio_mmc_host *host, int addr)
{
	return readw(host->ctl + (addr << host->bus_shift)) |
	       readw(host->ctl + ((addr + 2) << host->bus_shift)) << 16;
}

static void sd_ctrl_write16(struct tmio_mmc_host *host, int addr, u16 val)
{
	writew(val, host->ctl + (addr << host->bus_shift));
}

static void sd_ctrl_write16_rep(struct tmio_mmc_host *host, int addr,
		u16 *buf, int count)
{
	writesw(host->ctl + (addr << host->bus_shift), buf, count);
}

static void sd_ctrl_write32(struct tmio_mmc_host *host, int addr, u32 val)
{
	writew(val, host->ctl + (addr << host->bus_shift));
	writew(val >> 16, host->ctl + ((addr + 2) << host->bus_shift));
}

void tmio_mmc_enable_mmc_irqs(struct tmio_mmc_host *host, u32 i)
{
	u32 mask = sd_ctrl_read32(host, CTL_IRQ_MASK) & ~(i & TMIO_MASK_IRQ);
	sd_ctrl_write32(host, CTL_IRQ_MASK, mask);
}

void tmio_mmc_disable_mmc_irqs(struct tmio_mmc_host *host, u32 i)
{
	u32 mask = sd_ctrl_read32(host, CTL_IRQ_MASK) | (i & TMIO_MASK_IRQ);
	sd_ctrl_write32(host, CTL_IRQ_MASK, mask);
}

static void tmio_mmc_ack_mmc_irqs(struct tmio_mmc_host *host, u32 i)
{
	sd_ctrl_write32(host, CTL_STATUS, ~i);
}

static void tmio_mmc_init_sg(struct tmio_mmc_host *host, struct mmc_data *data)
{
	host->sg_len = data->sg_len;
	host->sg_ptr = data->sg;
	host->sg_orig = data->sg;
	host->sg_off = 0;
}

static int tmio_mmc_next_sg(struct tmio_mmc_host *host)
{
	host->sg_ptr = sg_next(host->sg_ptr);
	host->sg_off = 0;
	return --host->sg_len;
}

#ifdef CONFIG_MMC_DEBUG

#define STATUS_TO_TEXT(a, status, i) \
	do { \
		if (status & TMIO_STAT_##a) { \
			if (i++) \
				printk(" | "); \
			printk(#a); \
		} \
	} while (0)

static void pr_debug_status(u32 status)
{
	int i = 0;
	printk(KERN_DEBUG "status: %08x = ", status);
	STATUS_TO_TEXT(CARD_REMOVE, status, i);
	STATUS_TO_TEXT(CARD_INSERT, status, i);
	STATUS_TO_TEXT(SIGSTATE, status, i);
	STATUS_TO_TEXT(WRPROTECT, status, i);
	STATUS_TO_TEXT(CARD_REMOVE_A, status, i);
	STATUS_TO_TE