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5df0e8231f
BUG_ONs doesn't help anything except for stop the system from running. If it occurs, it implies we should deploy proper error handling for that. So this patch is gonna discard these meaningless BUG_ONs and deploy error handling if needed. Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
419 lines
9 KiB
C
419 lines
9 KiB
C
/*
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* linux/drivers/mmc/core/sdio_cis.c
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*
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* Author: Nicolas Pitre
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* Created: June 11, 2007
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* Copyright: MontaVista Software Inc.
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*
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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 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/kernel.h>
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#include <linux/slab.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 "sdio_cis.h"
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#include "sdio_ops.h"
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static int cistpl_vers_1(struct mmc_card *card, struct sdio_func *func,
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const unsigned char *buf, unsigned size)
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{
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unsigned i, nr_strings;
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char **buffer, *string;
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/* Find all null-terminated (including zero length) strings in
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the TPLLV1_INFO field. Trailing garbage is ignored. */
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buf += 2;
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size -= 2;
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nr_strings = 0;
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for (i = 0; i < size; i++) {
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if (buf[i] == 0xff)
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break;
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if (buf[i] == 0)
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nr_strings++;
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}
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if (nr_strings == 0)
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return 0;
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size = i;
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buffer = kzalloc(sizeof(char*) * nr_strings + size, GFP_KERNEL);
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if (!buffer)
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return -ENOMEM;
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string = (char*)(buffer + nr_strings);
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for (i = 0; i < nr_strings; i++) {
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buffer[i] = string;
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strcpy(string, buf);
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string += strlen(string) + 1;
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buf += strlen(buf) + 1;
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}
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if (func) {
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func->num_info = nr_strings;
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func->info = (const char**)buffer;
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} else {
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card->num_info = nr_strings;
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card->info = (const char**)buffer;
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}
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return 0;
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}
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static int cistpl_manfid(struct mmc_card *card, struct sdio_func *func,
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const unsigned char *buf, unsigned size)
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{
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unsigned int vendor, device;
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/* TPLMID_MANF */
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vendor = buf[0] | (buf[1] << 8);
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/* TPLMID_CARD */
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device = buf[2] | (buf[3] << 8);
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if (func) {
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func->vendor = vendor;
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func->device = device;
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} else {
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card->cis.vendor = vendor;
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card->cis.device = device;
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}
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return 0;
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}
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static const unsigned char speed_val[16] =
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{ 0, 10, 12, 13, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 70, 80 };
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static const unsigned int speed_unit[8] =
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{ 10000, 100000, 1000000, 10000000, 0, 0, 0, 0 };
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typedef int (tpl_parse_t)(struct mmc_card *, struct sdio_func *,
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const unsigned char *, unsigned);
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struct cis_tpl {
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unsigned char code;
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unsigned char min_size;
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tpl_parse_t *parse;
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};
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static int cis_tpl_parse(struct mmc_card *card, struct sdio_func *func,
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const char *tpl_descr,
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const struct cis_tpl *tpl, int tpl_count,
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unsigned char code,
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const unsigned char *buf, unsigned size)
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{
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int i, ret;
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/* look for a matching code in the table */
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for (i = 0; i < tpl_count; i++, tpl++) {
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if (tpl->code == code)
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break;
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}
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if (i < tpl_count) {
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if (size >= tpl->min_size) {
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if (tpl->parse)
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ret = tpl->parse(card, func, buf, size);
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else
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ret = -EILSEQ; /* known tuple, not parsed */
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} else {
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/* invalid tuple */
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ret = -EINVAL;
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}
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if (ret && ret != -EILSEQ && ret != -ENOENT) {
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pr_err("%s: bad %s tuple 0x%02x (%u bytes)\n",
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mmc_hostname(card->host), tpl_descr, code, size);
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}
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} else {
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/* unknown tuple */
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ret = -ENOENT;
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}
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return ret;
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}
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static int cistpl_funce_common(struct mmc_card *card, struct sdio_func *func,
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const unsigned char *buf, unsigned size)
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{
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/* Only valid for the common CIS (function 0) */
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if (func)
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return -EINVAL;
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/* TPLFE_FN0_BLK_SIZE */
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card->cis.blksize = buf[1] | (buf[2] << 8);
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/* TPLFE_MAX_TRAN_SPEED */
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card->cis.max_dtr = speed_val[(buf[3] >> 3) & 15] *
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speed_unit[buf[3] & 7];
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return 0;
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}
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static int cistpl_funce_func(struct mmc_card *card, struct sdio_func *func,
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const unsigned char *buf, unsigned size)
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{
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unsigned vsn;
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unsigned min_size;
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/* Only valid for the individual function's CIS (1-7) */
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if (!func)
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return -EINVAL;
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/*
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* This tuple has a different length depending on the SDIO spec
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* version.
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*/
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vsn = func->card->cccr.sdio_vsn;
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min_size = (vsn == SDIO_SDIO_REV_1_00) ? 28 : 42;
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if (size == 28 && vsn == SDIO_SDIO_REV_1_10) {
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pr_warn("%s: card has broken SDIO 1.1 CIS, forcing SDIO 1.0\n",
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mmc_hostname(card->host));
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vsn = SDIO_SDIO_REV_1_00;
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} else if (size < min_size) {
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return -EINVAL;
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}
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/* TPLFE_MAX_BLK_SIZE */
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func->max_blksize = buf[12] | (buf[13] << 8);
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/* TPLFE_ENABLE_TIMEOUT_VAL, present in ver 1.1 and above */
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if (vsn > SDIO_SDIO_REV_1_00)
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func->enable_timeout = (buf[28] | (buf[29] << 8)) * 10;
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else
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func->enable_timeout = jiffies_to_msecs(HZ);
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return 0;
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}
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/*
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* Known TPLFE_TYPEs table for CISTPL_FUNCE tuples.
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*
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* Note that, unlike PCMCIA, CISTPL_FUNCE tuples are not parsed depending
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* on the TPLFID_FUNCTION value of the previous CISTPL_FUNCID as on SDIO
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* TPLFID_FUNCTION is always hardcoded to 0x0C.
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*/
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static const struct cis_tpl cis_tpl_funce_list[] = {
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{ 0x00, 4, cistpl_funce_common },
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{ 0x01, 0, cistpl_funce_func },
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{ 0x04, 1+1+6, /* CISTPL_FUNCE_LAN_NODE_ID */ },
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};
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static int cistpl_funce(struct mmc_card *card, struct sdio_func *func,
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const unsigned char *buf, unsigned size)
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{
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if (size < 1)
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return -EINVAL;
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return cis_tpl_parse(card, func, "CISTPL_FUNCE",
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cis_tpl_funce_list,
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ARRAY_SIZE(cis_tpl_funce_list),
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buf[0], buf, size);
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}
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/* Known TPL_CODEs table for CIS tuples */
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static const struct cis_tpl cis_tpl_list[] = {
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{ 0x15, 3, cistpl_vers_1 },
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{ 0x20, 4, cistpl_manfid },
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{ 0x21, 2, /* cistpl_funcid */ },
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{ 0x22, 0, cistpl_funce },
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{ 0x91, 2, /* cistpl_sdio_std */ },
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};
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static int sdio_read_cis(struct mmc_card *card, struct sdio_func *func)
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{
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int ret;
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struct sdio_func_tuple *this, **prev;
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unsigned i, ptr = 0;
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/*
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* Note that this works for the common CIS (function number 0) as
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* well as a function's CIS * since SDIO_CCCR_CIS and SDIO_FBR_CIS
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* have the same offset.
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*/
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for (i = 0; i < 3; i++) {
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unsigned char x, fn;
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if (func)
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fn = func->num;
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else
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fn = 0;
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ret = mmc_io_rw_direct(card, 0, 0,
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SDIO_FBR_BASE(fn) + SDIO_FBR_CIS + i, 0, &x);
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if (ret)
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return ret;
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ptr |= x << (i * 8);
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}
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if (func)
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prev = &func->tuples;
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else
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prev = &card->tuples;
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if (*prev)
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return -EINVAL;
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do {
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unsigned char tpl_code, tpl_link;
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ret = mmc_io_rw_direct(card, 0, 0, ptr++, 0, &tpl_code);
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if (ret)
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break;
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/* 0xff means we're done */
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if (tpl_code == 0xff)
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break;
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/* null entries have no link field or data */
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if (tpl_code == 0x00)
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continue;
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ret = mmc_io_rw_direct(card, 0, 0, ptr++, 0, &tpl_link);
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if (ret)
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break;
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/* a size of 0xff also means we're done */
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if (tpl_link == 0xff)
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break;
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this = kmalloc(sizeof(*this) + tpl_link, GFP_KERNEL);
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if (!this)
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return -ENOMEM;
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for (i = 0; i < tpl_link; i++) {
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ret = mmc_io_rw_direct(card, 0, 0,
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ptr + i, 0, &this->data[i]);
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if (ret)
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break;
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}
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if (ret) {
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kfree(this);
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break;
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}
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/* Try to parse the CIS tuple */
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ret = cis_tpl_parse(card, func, "CIS",
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cis_tpl_list, ARRAY_SIZE(cis_tpl_list),
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tpl_code, this->data, tpl_link);
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if (ret == -EILSEQ || ret == -ENOENT) {
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/*
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* The tuple is unknown or known but not parsed.
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* Queue the tuple for the function driver.
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*/
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this->next = NULL;
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this->code = tpl_code;
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this->size = tpl_link;
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*prev = this;
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prev = &this->next;
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if (ret == -ENOENT) {
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/* warn about unknown tuples */
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pr_warn_ratelimited("%s: queuing unknown"
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" CIS tuple 0x%02x (%u bytes)\n",
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mmc_hostname(card->host),
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tpl_code, tpl_link);
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}
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/* keep on analyzing tuples */
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ret = 0;
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} else {
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/*
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* We don't need the tuple anymore if it was
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* successfully parsed by the SDIO core or if it is
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* not going to be queued for a driver.
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*/
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kfree(this);
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}
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ptr += tpl_link;
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} while (!ret);
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/*
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* Link in all unknown tuples found in the common CIS so that
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* drivers don't have to go digging in two places.
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*/
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if (func)
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*prev = card->tuples;
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return ret;
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}
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int sdio_read_common_cis(struct mmc_card *card)
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{
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return sdio_read_cis(card, NULL);
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}
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void sdio_free_common_cis(struct mmc_card *card)
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{
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struct sdio_func_tuple *tuple, *victim;
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tuple = card->tuples;
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while (tuple) {
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victim = tuple;
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tuple = tuple->next;
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kfree(victim);
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}
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card->tuples = NULL;
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}
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int sdio_read_func_cis(struct sdio_func *func)
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{
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int ret;
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ret = sdio_read_cis(func->card, func);
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if (ret)
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return ret;
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/*
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* Since we've linked to tuples in the card structure,
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* we must make sure we have a reference to it.
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*/
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get_device(&func->card->dev);
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/*
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* Vendor/device id is optional for function CIS, so
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* copy it from the card structure as needed.
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*/
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if (func->vendor == 0) {
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func->vendor = func->card->cis.vendor;
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func->device = func->card->cis.device;
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}
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return 0;
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}
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void sdio_free_func_cis(struct sdio_func *func)
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{
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struct sdio_func_tuple *tuple, *victim;
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tuple = func->tuples;
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while (tuple && tuple != func->card->tuples) {
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victim = tuple;
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tuple = tuple->next;
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kfree(victim);
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}
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func->tuples = NULL;
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/*
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* We have now removed the link to the tuples in the
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* card structure, so remove the reference.
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*/
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put_device(&func->card->dev);
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}
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