fba68bd2da
Thanks to the generous donation of an SDHC card by John Gilmore, and the surprisingly enlightened decision by the SD Card Association to publish useful specs, I've been able to bash out support for SDHC. The changes are not too profound: i) Add a card flag indicating the card uses block level addressing and check it in the block driver. As we never took advantage of byte-level addressing, this simply involves skipping the block -> byte translation when sending commands. ii) The layout of the CSD is changed - a set of fields are discarded to make space for a larger C_SIZE. We did not reference any of the discarded fields except those related to the C_SIZE. iii) Read and write timeouts are fixed values and not calculated from CSD values. iv) Before invoking SEND_APP_OP_COND, we must invoke the new SEND_IF_COND to inform the card we support SDHC. Signed-off-by: Philipl Langdale <philipl@overt.org> Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
130 lines
3.9 KiB
C
130 lines
3.9 KiB
C
/*
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* linux/include/linux/mmc/card.h
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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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* Card driver specific definitions.
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*/
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#ifndef LINUX_MMC_CARD_H
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#define LINUX_MMC_CARD_H
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#include <linux/mmc/mmc.h>
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struct mmc_cid {
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unsigned int manfid;
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char prod_name[8];
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unsigned int serial;
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unsigned short oemid;
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unsigned short year;
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unsigned char hwrev;
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unsigned char fwrev;
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unsigned char month;
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};
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struct mmc_csd {
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unsigned char mmca_vsn;
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unsigned short cmdclass;
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unsigned short tacc_clks;
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unsigned int tacc_ns;
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unsigned int r2w_factor;
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unsigned int max_dtr;
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unsigned int read_blkbits;
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unsigned int write_blkbits;
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unsigned int capacity;
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unsigned int read_partial:1,
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read_misalign:1,
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write_partial:1,
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write_misalign:1;
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};
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struct mmc_ext_csd {
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unsigned int hs_max_dtr;
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};
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struct sd_scr {
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unsigned char sda_vsn;
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unsigned char bus_widths;
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#define SD_SCR_BUS_WIDTH_1 (1<<0)
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#define SD_SCR_BUS_WIDTH_4 (1<<2)
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};
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struct sd_switch_caps {
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unsigned int hs_max_dtr;
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};
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struct mmc_host;
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/*
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* MMC device
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*/
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struct mmc_card {
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struct list_head node; /* node in hosts devices list */
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struct mmc_host *host; /* the host this device belongs to */
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struct device dev; /* the device */
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unsigned int rca; /* relative card address of device */
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unsigned int state; /* (our) card state */
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#define MMC_STATE_PRESENT (1<<0) /* present in sysfs */
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#define MMC_STATE_DEAD (1<<1) /* device no longer in stack */
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#define MMC_STATE_BAD (1<<2) /* unrecognised device */
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#define MMC_STATE_SDCARD (1<<3) /* is an SD card */
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#define MMC_STATE_READONLY (1<<4) /* card is read-only */
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#define MMC_STATE_HIGHSPEED (1<<5) /* card is in high speed mode */
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#define MMC_STATE_BLOCKADDR (1<<6) /* card uses block-addressing */
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u32 raw_cid[4]; /* raw card CID */
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u32 raw_csd[4]; /* raw card CSD */
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u32 raw_scr[2]; /* raw card SCR */
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struct mmc_cid cid; /* card identification */
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struct mmc_csd csd; /* card specific */
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struct mmc_ext_csd ext_csd; /* mmc v4 extended card specific */
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struct sd_scr scr; /* extra SD information */
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struct sd_switch_caps sw_caps; /* switch (CMD6) caps */
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};
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#define mmc_card_present(c) ((c)->state & MMC_STATE_PRESENT)
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#define mmc_card_dead(c) ((c)->state & MMC_STATE_DEAD)
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#define mmc_card_bad(c) ((c)->state & MMC_STATE_BAD)
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#define mmc_card_sd(c) ((c)->state & MMC_STATE_SDCARD)
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#define mmc_card_readonly(c) ((c)->state & MMC_STATE_READONLY)
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#define mmc_card_highspeed(c) ((c)->state & MMC_STATE_HIGHSPEED)
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#define mmc_card_blockaddr(c) ((c)->state & MMC_STATE_BLOCKADDR)
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#define mmc_card_set_present(c) ((c)->state |= MMC_STATE_PRESENT)
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#define mmc_card_set_dead(c) ((c)->state |= MMC_STATE_DEAD)
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#define mmc_card_set_bad(c) ((c)->state |= MMC_STATE_BAD)
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#define mmc_card_set_sd(c) ((c)->state |= MMC_STATE_SDCARD)
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#define mmc_card_set_readonly(c) ((c)->state |= MMC_STATE_READONLY)
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#define mmc_card_set_highspeed(c) ((c)->state |= MMC_STATE_HIGHSPEED)
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#define mmc_card_set_blockaddr(c) ((c)->state |= MMC_STATE_BLOCKADDR)
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#define mmc_card_name(c) ((c)->cid.prod_name)
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#define mmc_card_id(c) ((c)->dev.bus_id)
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#define mmc_list_to_card(l) container_of(l, struct mmc_card, node)
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#define mmc_get_drvdata(c) dev_get_drvdata(&(c)->dev)
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#define mmc_set_drvdata(c,d) dev_set_drvdata(&(c)->dev, d)
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/*
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* MMC device driver (e.g., Flash card, I/O card...)
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*/
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struct mmc_driver {
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struct device_driver drv;
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int (*probe)(struct mmc_card *);
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void (*remove)(struct mmc_card *);
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int (*suspend)(struct mmc_card *, pm_message_t);
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int (*resume)(struct mmc_card *);
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};
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extern int mmc_register_driver(struct mmc_driver *);
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extern void mmc_unregister_driver(struct mmc_driver *);
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static inline int mmc_card_claim_host(struct mmc_card *card)
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{
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return __mmc_claim_host(card->host, card);
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}
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#define mmc_card_release_host(c) mmc_release_host((c)->host)
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#endif
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