625 lines
12 KiB
C
625 lines
12 KiB
C
/*
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* linux/drivers/mmc/sdio.c
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*
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* Copyright 2006-2007 Pierre Ossman
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*/
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#include <linux/err.h>
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#include <linux/mmc/host.h>
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#include <linux/mmc/card.h>
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#include <linux/mmc/sdio.h>
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#include <linux/mmc/sdio_func.h>
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#include "core.h"
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#include "bus.h"
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#include "sdio_bus.h"
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#include "mmc_ops.h"
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#include "sd_ops.h"
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#include "sdio_ops.h"
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#include "sdio_cis.h"
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static int sdio_read_fbr(struct sdio_func *func)
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{
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int ret;
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unsigned char data;
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ret = mmc_io_rw_direct(func->card, 0, 0,
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SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF, 0, &data);
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if (ret)
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goto out;
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data &= 0x0f;
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if (data == 0x0f) {
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ret = mmc_io_rw_direct(func->card, 0, 0,
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SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF_EXT, 0, &data);
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if (ret)
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goto out;
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}
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func->class = data;
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out:
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return ret;
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}
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static int sdio_init_func(struct mmc_card *card, unsigned int fn)
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{
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int ret;
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struct sdio_func *func;
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BUG_ON(fn > SDIO_MAX_FUNCS);
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func = sdio_alloc_func(card);
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if (IS_ERR(func))
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return PTR_ERR(func);
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func->num = fn;
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ret = sdio_read_fbr(func);
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if (ret)
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goto fail;
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ret = sdio_read_func_cis(func);
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if (ret)
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goto fail;
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card->sdio_func[fn - 1] = func;
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return 0;
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fail:
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/*
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* It is okay to remove the function here even though we hold
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* the host lock as we haven't registered the device yet.
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*/
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sdio_remove_func(func);
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return ret;
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}
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static int sdio_read_cccr(struct mmc_card *card)
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{
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int ret;
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int cccr_vsn;
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unsigned char data;
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memset(&card->cccr, 0, sizeof(struct sdio_cccr));
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ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CCCR, 0, &data);
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if (ret)
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goto out;
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cccr_vsn = data & 0x0f;
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if (cccr_vsn > SDIO_CCCR_REV_1_20) {
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printk(KERN_ERR "%s: unrecognised CCCR structure version %d\n",
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mmc_hostname(card->host), cccr_vsn);
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return -EINVAL;
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}
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card->cccr.sdio_vsn = (data & 0xf0) >> 4;
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ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CAPS, 0, &data);
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if (ret)
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goto out;
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if (data & SDIO_CCCR_CAP_SMB)
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card->cccr.multi_block = 1;
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if (data & SDIO_CCCR_CAP_LSC)
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card->cccr.low_speed = 1;
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if (data & SDIO_CCCR_CAP_4BLS)
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card->cccr.wide_bus = 1;
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if (cccr_vsn >= SDIO_CCCR_REV_1_10) {
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ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_POWER, 0, &data);
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if (ret)
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goto out;
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if (data & SDIO_POWER_SMPC)
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card->cccr.high_power = 1;
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}
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if (cccr_vsn >= SDIO_CCCR_REV_1_20) {
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ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &data);
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if (ret)
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goto out;
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if (data & SDIO_SPEED_SHS)
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card->cccr.high_speed = 1;
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}
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out:
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return ret;
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}
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static int sdio_enable_wide(struct mmc_card *card)
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{
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int ret;
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u8 ctrl;
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if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
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return 0;
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if (card->cccr.low_speed && !card->cccr.wide_bus)
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return 0;
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ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
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if (ret)
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return ret;
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ctrl |= SDIO_BUS_WIDTH_4BIT;
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ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
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if (ret)
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return ret;
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mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
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return 0;
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}
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/*
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* If desired, disconnect the pull-up resistor on CD/DAT[3] (pin 1)
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* of the card. This may be required on certain setups of boards,
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* controllers and embedded sdio device which do not need the card's
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* pull-up. As a result, card detection is disabled and power is saved.
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*/
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static int sdio_disable_cd(struct mmc_card *card)
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{
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int ret;
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u8 ctrl;
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if (!card->cccr.disable_cd)
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return 0;
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ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
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if (ret)
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return ret;
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ctrl |= SDIO_BUS_CD_DISABLE;
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return mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
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}
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/*
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* Devices that remain active during a system suspend are
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* put back into 1-bit mode.
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*/
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static int sdio_disable_wide(struct mmc_card *card)
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{
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int ret;
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u8 ctrl;
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if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
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return 0;
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if (card->cccr.low_speed && !card->cccr.wide_bus)
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return 0;
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ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
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if (ret)
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return ret;
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if (!(ctrl & SDIO_BUS_WIDTH_4BIT))
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return 0;
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ctrl &= ~SDIO_BUS_WIDTH_4BIT;
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ctrl |= SDIO_BUS_ASYNC_INT;
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ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
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if (ret)
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return ret;
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mmc_set_bus_width(card->host, MMC_BUS_WIDTH_1);
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return 0;
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}
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/*
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* Test if the card supports high-speed mode and, if so, switch to it.
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*/
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static int sdio_enable_hs(struct mmc_card *card)
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{
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int ret;
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u8 speed;
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if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
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return 0;
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if (!card->cccr.high_speed)
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return 0;
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ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
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if (ret)
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return ret;
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speed |= SDIO_SPEED_EHS;
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ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
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if (ret)
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return ret;
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mmc_card_set_highspeed(card);
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mmc_set_timing(card->host, MMC_TIMING_SD_HS);
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return 0;
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}
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/*
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* Handle the detection and initialisation of a card.
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*
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* In the case of a resume, "oldcard" will contain the card
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* we're trying to reinitialise.
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*/
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static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
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struct mmc_card *oldcard, int powered_resume)
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{
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struct mmc_card *card;
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int err;
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BUG_ON(!host);
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WARN_ON(!host->claimed);
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/*
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* Inform the card of the voltage
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*/
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if (!powered_resume) {
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err = mmc_send_io_op_cond(host, host->ocr, &ocr);
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if (err)
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goto err;
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}
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/*
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* For SPI, enable CRC as appropriate.
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*/
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if (mmc_host_is_spi(host)) {
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err = mmc_spi_set_crc(host, use_spi_crc);
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if (err)
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goto err;
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}
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/*
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* Allocate card structure.
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*/
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card = mmc_alloc_card(host, NULL);
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if (IS_ERR(card)) {
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err = PTR_ERR(card);
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goto err;
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}
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card->type = MMC_TYPE_SDIO;
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/*
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* For native busses: set card RCA and quit open drain mode.
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*/
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if (!powered_resume && !mmc_host_is_spi(host)) {
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err = mmc_send_relative_addr(host, &card->rca);
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if (err)
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goto remove;
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mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
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}
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/*
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* Select card, as all following commands rely on that.
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*/
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if (!powered_resume && !mmc_host_is_spi(host)) {
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err = mmc_select_card(card);
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if (err)
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goto remove;
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}
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/*
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* Read the common registers.
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*/
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err = sdio_read_cccr(card);
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if (err)
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goto remove;
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/*
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* Read the common CIS tuples.
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*/
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err = sdio_read_common_cis(card);
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if (err)
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goto remove;
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if (oldcard) {
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int same = (card->cis.vendor == oldcard->cis.vendor &&
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card->cis.device == oldcard->cis.device);
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mmc_remove_card(card);
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if (!same) {
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err = -ENOENT;
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goto err;
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}
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card = oldcard;
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return 0;
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}
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/*
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* Switch to high-speed (if supported).
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*/
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err = sdio_enable_hs(card);
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if (err)
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goto remove;
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/*
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* Change to the card's maximum speed.
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*/
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if (mmc_card_highspeed(card)) {
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/*
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* The SDIO specification doesn't mention how
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* the CIS transfer speed register relates to
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* high-speed, but it seems that 50 MHz is
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* mandatory.
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*/
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mmc_set_clock(host, 50000000);
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} else {
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mmc_set_clock(host, card->cis.max_dtr);
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}
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/*
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* Switch to wider bus (if supported).
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*/
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err = sdio_enable_wide(card);
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if (err)
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goto remove;
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if (!oldcard)
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host->card = card;
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return 0;
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remove:
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if (!oldcard)
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mmc_remove_card(card);
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err:
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return err;
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}
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/*
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* Host is being removed. Free up the current card.
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*/
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static void mmc_sdio_remove(struct mmc_host *host)
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{
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int i;
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BUG_ON(!host);
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BUG_ON(!host->card);
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for (i = 0;i < host->card->sdio_funcs;i++) {
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if (host->card->sdio_func[i]) {
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sdio_remove_func(host->card->sdio_func[i]);
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host->card->sdio_func[i] = NULL;
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}
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}
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mmc_remove_card(host->card);
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host->card = NULL;
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}
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/*
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* Card detection callback from host.
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*/
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static void mmc_sdio_detect(struct mmc_host *host)
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{
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int err;
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BUG_ON(!host);
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BUG_ON(!host->card);
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mmc_claim_host(host);
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/*
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* Just check if our card has been removed.
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*/
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err = mmc_select_card(host->card);
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mmc_release_host(host);
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if (err) {
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mmc_sdio_remove(host);
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mmc_claim_host(host);
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mmc_detach_bus(host);
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mmc_release_host(host);
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}
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}
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/*
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* SDIO suspend. We need to suspend all functions separately.
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* Therefore all registered functions must have drivers with suspend
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* and resume methods. Failing that we simply remove the whole card.
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*/
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static int mmc_sdio_suspend(struct mmc_host *host)
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{
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int i, err = 0;
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for (i = 0; i < host->card->sdio_funcs; i++) {
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struct sdio_func *func = host->card->sdio_func[i];
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if (func && sdio_func_present(func) && func->dev.driver) {
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const struct dev_pm_ops *pmops = func->dev.driver->pm;
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if (!pmops || !pmops->suspend || !pmops->resume) {
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/* force removal of entire card in that case */
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err = -ENOSYS;
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} else
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err = pmops->suspend(&func->dev);
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if (err)
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break;
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}
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}
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while (err && --i >= 0) {
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struct sdio_func *func = host->card->sdio_func[i];
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if (func && sdio_func_present(func) && func->dev.driver) {
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const struct dev_pm_ops *pmops = func->dev.driver->pm;
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pmops->resume(&func->dev);
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}
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}
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if (!err && host->pm_flags & MMC_PM_KEEP_POWER) {
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mmc_claim_host(host);
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sdio_disable_wide(host->card);
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mmc_release_host(host);
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}
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return err;
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}
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static int mmc_sdio_resume(struct mmc_host *host)
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{
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int i, err;
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BUG_ON(!host);
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BUG_ON(!host->card);
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/* Basic card reinitialization. */
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mmc_claim_host(host);
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err = mmc_sdio_init_card(host, host->ocr, host->card,
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(host->pm_flags & MMC_PM_KEEP_POWER));
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if (!err)
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/* We may have switched to 1-bit mode during suspend. */
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err = sdio_enable_wide(host->card);
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if (!err && host->sdio_irqs)
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mmc_signal_sdio_irq(host);
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mmc_release_host(host);
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/*
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* If the card looked to be the same as before suspending, then
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* we proceed to resume all card functions. If one of them returns
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* an error then we simply return that error to the core and the
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* card will be redetected as new. It is the responsibility of
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* the function driver to perform further tests with the extra
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* knowledge it has of the card to confirm the card is indeed the
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* same as before suspending (same MAC address for network cards,
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* etc.) and return an error otherwise.
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*/
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for (i = 0; !err && i < host->card->sdio_funcs; i++) {
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struct sdio_func *func = host->card->sdio_func[i];
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if (func && sdio_func_present(func) && func->dev.driver) {
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const struct dev_pm_ops *pmops = func->dev.driver->pm;
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err = pmops->resume(&func->dev);
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}
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}
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return err;
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}
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static const struct mmc_bus_ops mmc_sdio_ops = {
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.remove = mmc_sdio_remove,
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.detect = mmc_sdio_detect,
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.suspend = mmc_sdio_suspend,
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.resume = mmc_sdio_resume,
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};
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/*
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* Starting point for SDIO card init.
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*/
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int mmc_attach_sdio(struct mmc_host *host, u32 ocr)
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{
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int err;
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int i, funcs;
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struct mmc_card *card;
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BUG_ON(!host);
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WARN_ON(!host->claimed);
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mmc_attach_bus(host, &mmc_sdio_ops);
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/*
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* Sanity check the voltages that the card claims to
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* support.
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*/
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if (ocr & 0x7F) {
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printk(KERN_WARNING "%s: card claims to support voltages "
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"below the defined range. These will be ignored.\n",
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mmc_hostname(host));
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ocr &= ~0x7F;
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}
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host->ocr = mmc_select_voltage(host, ocr);
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/*
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* Can we support the voltage(s) of the card(s)?
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*/
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if (!host->ocr) {
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err = -EINVAL;
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goto err;
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}
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/*
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* Detect and init the card.
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*/
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err = mmc_sdio_init_card(host, host->ocr, NULL, 0);
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if (err)
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goto err;
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card = host->card;
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/*
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* The number of functions on the card is encoded inside
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* the ocr.
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*/
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|
funcs = (ocr & 0x70000000) >> 28;
|
|
card->sdio_funcs = 0;
|
|
|
|
/*
|
|
* If needed, disconnect card detection pull-up resistor.
|
|
*/
|
|
err = sdio_disable_cd(card);
|
|
if (err)
|
|
goto remove;
|
|
|
|
/*
|
|
* Initialize (but don't add) all present functions.
|
|
*/
|
|
for (i = 0; i < funcs; i++, card->sdio_funcs++) {
|
|
err = sdio_init_func(host->card, i + 1);
|
|
if (err)
|
|
goto remove;
|
|
}
|
|
|
|
mmc_release_host(host);
|
|
|
|
/*
|
|
* First add the card to the driver model...
|
|
*/
|
|
err = mmc_add_card(host->card);
|
|
if (err)
|
|
goto remove_added;
|
|
|
|
/*
|
|
* ...then the SDIO functions.
|
|
*/
|
|
for (i = 0;i < funcs;i++) {
|
|
err = sdio_add_func(host->card->sdio_func[i]);
|
|
if (err)
|
|
goto remove_added;
|
|
}
|
|
|
|
return 0;
|
|
|
|
|
|
remove_added:
|
|
/* Remove without lock if the device has been added. */
|
|
mmc_sdio_remove(host);
|
|
mmc_claim_host(host);
|
|
remove:
|
|
/* And with lock if it hasn't been added. */
|
|
if (host->card)
|
|
mmc_sdio_remove(host);
|
|
err:
|
|
mmc_detach_bus(host);
|
|
mmc_release_host(host);
|
|
|
|
printk(KERN_ERR "%s: error %d whilst initialising SDIO card\n",
|
|
mmc_hostname(host), err);
|
|
|
|
return err;
|
|
}
|
|
|