427 строки
9.0 KiB
C
427 строки
9.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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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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#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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u8 major_rev, minor_rev;
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unsigned i, nr_strings;
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char **buffer, *string;
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if (size < 2)
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return 0;
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major_rev = buf[0];
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minor_rev = buf[1];
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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->major_rev = major_rev;
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func->minor_rev = minor_rev;
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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->major_rev = major_rev;
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card->minor_rev = minor_rev;
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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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