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432 lines
9.2 KiB
432 lines
9.2 KiB
// 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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#define SDIO_READ_CIS_TIMEOUT_MS (10 * 1000) /* 10s */ |
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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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unsigned long timeout = jiffies + |
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msecs_to_jiffies(SDIO_READ_CIS_TIMEOUT_MS); |
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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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if (time_after(jiffies, timeout)) |
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break; |
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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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