af51715079
Teach the MMC/SD/SDIO core about using SPI mode.
- Use mmc_host_is_spi() so enumeration works through SPI signaling
and protocols, not just the native versions.
- Provide the SPI response type flags with each request issued,
including requests from the new lock/unlock code.
- Understand that cmd->resp[0] and mmc_get_status() results for SPI
return different values than for "native" MMC/SD protocol; this
affects resetting, checking card lock status, and some others.
- Understand that some commands act a bit differently ... notably:
* OP_COND command doesn't return the OCR
* APP_CMD status doesn't have an R1_APP_CMD analogue
Those changes required some new and updated primitives:
- Provide utilities to access two SPI-only requests, and one
request that wasn't previously needed:
* mmc_spi_read_ocr() ... SPI only
* mmc_spi_set_crc() ... SPI only (override by module parm)
* mmc_send_cid() ... for use without broadcast mode
- Updated internal routines:
* Previous mmc_send_csd() modified into mmc_send_cxd_native();
it uses native "R2" responses, which include 16 bytes of data.
* Previous mmc_send_ext_csd() becomes new mmc_send_cxd_data()
helper for command-and-data access
* Bugfix to that mmc_send_cxd_data() code: dma-to-stack is
unsafe/nonportable, so kmalloc a bounce buffer instead.
- Modified mmc_send_ext_csd() now uses mmc_send_cxd_data() helper
- Modified mmc_send_csd(), and new mmc_spi_send_cid(), routines use
those helper routines based on whether they're native or SPI
The newest categories of cards supported by the MMC stack aren't expected
to work yet with SPI: MMC or SD cards with over 4GB data, and SDIO.
All those cards support SPI mode, so eventually they should work too.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
395 lines
7.1 KiB
C
395 lines
7.1 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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* 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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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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};
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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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if (ocr & MMC_VDD_165_195) {
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printk(KERN_WARNING "%s: SDIO card claims to support the "
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"incompletely defined 'low voltage range'. This "
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"will be ignored.\n", mmc_hostname(host));
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ocr &= ~MMC_VDD_165_195;
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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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* Inform the card of the voltage
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*/
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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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* 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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* 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;
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/*
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* Allocate card structure.
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*/
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card = mmc_alloc_card(host);
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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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card->sdio_funcs = funcs;
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host->card = card;
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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 (!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 (!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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/*
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* No support for high-speed yet, so just set
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* the card's maximum speed.
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*/
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mmc_set_clock(host, card->cis.max_dtr);
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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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/*
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* Initialize (but don't add) all present functions.
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*/
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for (i = 0;i < funcs;i++) {
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err = sdio_init_func(host->card, i + 1);
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if (err)
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goto remove;
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}
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mmc_release_host(host);
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/*
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* First add the card to the driver model...
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*/
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err = mmc_add_card(host->card);
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if (err)
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goto remove_added;
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/*
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* ...then the SDIO functions.
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*/
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for (i = 0;i < funcs;i++) {
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err = sdio_add_func(host->card->sdio_func[i]);
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if (err)
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goto remove_added;
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}
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return 0;
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remove_added:
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/* Remove without lock if the device has been added. */
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mmc_sdio_remove(host);
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mmc_claim_host(host);
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remove:
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/* And with lock if it hasn't been added. */
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if (host->card)
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mmc_sdio_remove(host);
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err:
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mmc_detach_bus(host);
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mmc_release_host(host);
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printk(KERN_ERR "%s: error %d whilst initialising SDIO card\n",
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mmc_hostname(host), err);
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return err;
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}
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