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>
54 lines
1.5 KiB
C
54 lines
1.5 KiB
C
/*
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* linux/drivers/mmc/core/core.h
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*
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* Copyright (C) 2003 Russell King, All Rights Reserved.
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* Copyright 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 version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef _MMC_CORE_CORE_H
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#define _MMC_CORE_CORE_H
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#include <linux/delay.h>
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#define MMC_CMD_RETRIES 3
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struct mmc_bus_ops {
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void (*remove)(struct mmc_host *);
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void (*detect)(struct mmc_host *);
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int (*sysfs_add)(struct mmc_host *, struct mmc_card *card);
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void (*sysfs_remove)(struct mmc_host *, struct mmc_card *card);
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void (*suspend)(struct mmc_host *);
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void (*resume)(struct mmc_host *);
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};
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void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops);
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void mmc_detach_bus(struct mmc_host *host);
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void mmc_set_chip_select(struct mmc_host *host, int mode);
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void mmc_set_clock(struct mmc_host *host, unsigned int hz);
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void mmc_set_bus_mode(struct mmc_host *host, unsigned int mode);
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void mmc_set_bus_width(struct mmc_host *host, unsigned int width);
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u32 mmc_select_voltage(struct mmc_host *host, u32 ocr);
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void mmc_set_timing(struct mmc_host *host, unsigned int timing);
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static inline void mmc_delay(unsigned int ms)
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{
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if (ms < 1000 / HZ) {
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cond_resched();
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mdelay(ms);
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} else {
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msleep(ms);
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}
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}
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void mmc_rescan(struct work_struct *work);
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void mmc_start_host(struct mmc_host *host);
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void mmc_stop_host(struct mmc_host *host);
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extern int use_spi_crc;
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#endif
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