| /* |
| * linux/drivers/mmc/core/sdio_cis.c |
| * |
| * Author: Nicolas Pitre |
| * Created: June 11, 2007 |
| * Copyright: MontaVista Software Inc. |
| * |
| * Copyright 2007 Pierre Ossman |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or (at |
| * your option) any later version. |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/slab.h> |
| |
| #include <linux/mmc/host.h> |
| #include <linux/mmc/card.h> |
| #include <linux/mmc/sdio.h> |
| #include <linux/mmc/sdio_func.h> |
| |
| #include "sdio_cis.h" |
| #include "sdio_ops.h" |
| |
| #define SDIO_READ_CIS_TIMEOUT_MS (10 * 1000) /* 10s */ |
| |
| static int cistpl_vers_1(struct mmc_card *card, struct sdio_func *func, |
| const unsigned char *buf, unsigned size) |
| { |
| unsigned i, nr_strings; |
| char **buffer, *string; |
| |
| if (size < 2) |
| return 0; |
| |
| /* Find all null-terminated (including zero length) strings in |
| the TPLLV1_INFO field. Trailing garbage is ignored. */ |
| buf += 2; |
| size -= 2; |
| |
| nr_strings = 0; |
| for (i = 0; i < size; i++) { |
| if (buf[i] == 0xff) |
| break; |
| if (buf[i] == 0) |
| nr_strings++; |
| } |
| if (nr_strings == 0) |
| return 0; |
| |
| size = i; |
| |
| buffer = kzalloc(sizeof(char*) * nr_strings + size, GFP_KERNEL); |
| if (!buffer) |
| return -ENOMEM; |
| |
| string = (char*)(buffer + nr_strings); |
| |
| for (i = 0; i < nr_strings; i++) { |
| buffer[i] = string; |
| strcpy(string, buf); |
| string += strlen(string) + 1; |
| buf += strlen(buf) + 1; |
| } |
| |
| if (func) { |
| func->num_info = nr_strings; |
| func->info = (const char**)buffer; |
| } else { |
| card->num_info = nr_strings; |
| card->info = (const char**)buffer; |
| } |
| |
| return 0; |
| } |
| |
| static int cistpl_manfid(struct mmc_card *card, struct sdio_func *func, |
| const unsigned char *buf, unsigned size) |
| { |
| unsigned int vendor, device; |
| |
| /* TPLMID_MANF */ |
| vendor = buf[0] | (buf[1] << 8); |
| |
| /* TPLMID_CARD */ |
| device = buf[2] | (buf[3] << 8); |
| |
| if (func) { |
| func->vendor = vendor; |
| func->device = device; |
| } else { |
| card->cis.vendor = vendor; |
| card->cis.device = device; |
| } |
| |
| return 0; |
| } |
| |
| static const unsigned char speed_val[16] = |
| { 0, 10, 12, 13, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 70, 80 }; |
| static const unsigned int speed_unit[8] = |
| { 10000, 100000, 1000000, 10000000, 0, 0, 0, 0 }; |
| |
| |
| typedef int (tpl_parse_t)(struct mmc_card *, struct sdio_func *, |
| const unsigned char *, unsigned); |
| |
| struct cis_tpl { |
| unsigned char code; |
| unsigned char min_size; |
| tpl_parse_t *parse; |
| }; |
| |
| static int cis_tpl_parse(struct mmc_card *card, struct sdio_func *func, |
| const char *tpl_descr, |
| const struct cis_tpl *tpl, int tpl_count, |
| unsigned char code, |
| const unsigned char *buf, unsigned size) |
| { |
| int i, ret; |
| |
| /* look for a matching code in the table */ |
| for (i = 0; i < tpl_count; i++, tpl++) { |
| if (tpl->code == code) |
| break; |
| } |
| if (i < tpl_count) { |
| if (size >= tpl->min_size) { |
| if (tpl->parse) |
| ret = tpl->parse(card, func, buf, size); |
| else |
| ret = -EILSEQ; /* known tuple, not parsed */ |
| } else { |
| /* invalid tuple */ |
| ret = -EINVAL; |
| } |
| if (ret && ret != -EILSEQ && ret != -ENOENT) { |
| pr_err("%s: bad %s tuple 0x%02x (%u bytes)\n", |
| mmc_hostname(card->host), tpl_descr, code, size); |
| } |
| } else { |
| /* unknown tuple */ |
| ret = -ENOENT; |
| } |
| |
| return ret; |
| } |
| |
| static int cistpl_funce_common(struct mmc_card *card, struct sdio_func *func, |
| const unsigned char *buf, unsigned size) |
| { |
| /* Only valid for the common CIS (function 0) */ |
| if (func) |
| return -EINVAL; |
| |
| /* TPLFE_FN0_BLK_SIZE */ |
| card->cis.blksize = buf[1] | (buf[2] << 8); |
| |
| /* TPLFE_MAX_TRAN_SPEED */ |
| card->cis.max_dtr = speed_val[(buf[3] >> 3) & 15] * |
| speed_unit[buf[3] & 7]; |
| |
| return 0; |
| } |
| |
| static int cistpl_funce_func(struct mmc_card *card, struct sdio_func *func, |
| const unsigned char *buf, unsigned size) |
| { |
| unsigned vsn; |
| unsigned min_size; |
| |
| /* Only valid for the individual function's CIS (1-7) */ |
| if (!func) |
| return -EINVAL; |
| |
| /* |
| * This tuple has a different length depending on the SDIO spec |
| * version. |
| */ |
| vsn = func->card->cccr.sdio_vsn; |
| min_size = (vsn == SDIO_SDIO_REV_1_00) ? 28 : 42; |
| |
| if (size == 28 && vsn == SDIO_SDIO_REV_1_10) { |
| pr_warn("%s: card has broken SDIO 1.1 CIS, forcing SDIO 1.0\n", |
| mmc_hostname(card->host)); |
| vsn = SDIO_SDIO_REV_1_00; |
| } else if (size < min_size) { |
| return -EINVAL; |
| } |
| |
| /* TPLFE_MAX_BLK_SIZE */ |
| func->max_blksize = buf[12] | (buf[13] << 8); |
| |
| /* TPLFE_ENABLE_TIMEOUT_VAL, present in ver 1.1 and above */ |
| if (vsn > SDIO_SDIO_REV_1_00) |
| func->enable_timeout = (buf[28] | (buf[29] << 8)) * 10; |
| else |
| func->enable_timeout = jiffies_to_msecs(HZ); |
| |
| return 0; |
| } |
| |
| /* |
| * Known TPLFE_TYPEs table for CISTPL_FUNCE tuples. |
| * |
| * Note that, unlike PCMCIA, CISTPL_FUNCE tuples are not parsed depending |
| * on the TPLFID_FUNCTION value of the previous CISTPL_FUNCID as on SDIO |
| * TPLFID_FUNCTION is always hardcoded to 0x0C. |
| */ |
| static const struct cis_tpl cis_tpl_funce_list[] = { |
| { 0x00, 4, cistpl_funce_common }, |
| { 0x01, 0, cistpl_funce_func }, |
| { 0x04, 1+1+6, /* CISTPL_FUNCE_LAN_NODE_ID */ }, |
| }; |
| |
| static int cistpl_funce(struct mmc_card *card, struct sdio_func *func, |
| const unsigned char *buf, unsigned size) |
| { |
| if (size < 1) |
| return -EINVAL; |
| |
| return cis_tpl_parse(card, func, "CISTPL_FUNCE", |
| cis_tpl_funce_list, |
| ARRAY_SIZE(cis_tpl_funce_list), |
| buf[0], buf, size); |
| } |
| |
| /* Known TPL_CODEs table for CIS tuples */ |
| static const struct cis_tpl cis_tpl_list[] = { |
| { 0x15, 3, cistpl_vers_1 }, |
| { 0x20, 4, cistpl_manfid }, |
| { 0x21, 2, /* cistpl_funcid */ }, |
| { 0x22, 0, cistpl_funce }, |
| { 0x91, 2, /* cistpl_sdio_std */ }, |
| }; |
| |
| static int sdio_read_cis(struct mmc_card *card, struct sdio_func *func) |
| { |
| int ret; |
| struct sdio_func_tuple *this, **prev; |
| unsigned i, ptr = 0; |
| |
| /* |
| * Note that this works for the common CIS (function number 0) as |
| * well as a function's CIS * since SDIO_CCCR_CIS and SDIO_FBR_CIS |
| * have the same offset. |
| */ |
| for (i = 0; i < 3; i++) { |
| unsigned char x, fn; |
| |
| if (func) |
| fn = func->num; |
| else |
| fn = 0; |
| |
| ret = mmc_io_rw_direct(card, 0, 0, |
| SDIO_FBR_BASE(fn) + SDIO_FBR_CIS + i, 0, &x); |
| if (ret) |
| return ret; |
| ptr |= x << (i * 8); |
| } |
| |
| if (func) |
| prev = &func->tuples; |
| else |
| prev = &card->tuples; |
| |
| if (*prev) |
| return -EINVAL; |
| |
| do { |
| unsigned char tpl_code, tpl_link; |
| unsigned long timeout = jiffies + |
| msecs_to_jiffies(SDIO_READ_CIS_TIMEOUT_MS); |
| |
| ret = mmc_io_rw_direct(card, 0, 0, ptr++, 0, &tpl_code); |
| if (ret) |
| break; |
| |
| /* 0xff means we're done */ |
| if (tpl_code == 0xff) |
| break; |
| |
| /* null entries have no link field or data */ |
| if (tpl_code == 0x00) |
| continue; |
| |
| ret = mmc_io_rw_direct(card, 0, 0, ptr++, 0, &tpl_link); |
| if (ret) |
| break; |
| |
| /* a size of 0xff also means we're done */ |
| if (tpl_link == 0xff) |
| break; |
| |
| this = kmalloc(sizeof(*this) + tpl_link, GFP_KERNEL); |
| if (!this) |
| return -ENOMEM; |
| |
| for (i = 0; i < tpl_link; i++) { |
| ret = mmc_io_rw_direct(card, 0, 0, |
| ptr + i, 0, &this->data[i]); |
| if (ret) |
| break; |
| } |
| if (ret) { |
| kfree(this); |
| break; |
| } |
| |
| /* Try to parse the CIS tuple */ |
| ret = cis_tpl_parse(card, func, "CIS", |
| cis_tpl_list, ARRAY_SIZE(cis_tpl_list), |
| tpl_code, this->data, tpl_link); |
| if (ret == -EILSEQ || ret == -ENOENT) { |
| /* |
| * The tuple is unknown or known but not parsed. |
| * Queue the tuple for the function driver. |
| */ |
| this->next = NULL; |
| this->code = tpl_code; |
| this->size = tpl_link; |
| *prev = this; |
| prev = &this->next; |
| |
| if (ret == -ENOENT) { |
| if (time_after(jiffies, timeout)) |
| break; |
| /* warn about unknown tuples */ |
| pr_warn_ratelimited("%s: queuing unknown" |
| " CIS tuple 0x%02x (%u bytes)\n", |
| mmc_hostname(card->host), |
| tpl_code, tpl_link); |
| } |
| |
| /* keep on analyzing tuples */ |
| ret = 0; |
| } else { |
| /* |
| * We don't need the tuple anymore if it was |
| * successfully parsed by the SDIO core or if it is |
| * not going to be queued for a driver. |
| */ |
| kfree(this); |
| } |
| |
| ptr += tpl_link; |
| } while (!ret); |
| |
| /* |
| * Link in all unknown tuples found in the common CIS so that |
| * drivers don't have to go digging in two places. |
| */ |
| if (func) |
| *prev = card->tuples; |
| |
| return ret; |
| } |
| |
| int sdio_read_common_cis(struct mmc_card *card) |
| { |
| return sdio_read_cis(card, NULL); |
| } |
| |
| void sdio_free_common_cis(struct mmc_card *card) |
| { |
| struct sdio_func_tuple *tuple, *victim; |
| |
| tuple = card->tuples; |
| |
| while (tuple) { |
| victim = tuple; |
| tuple = tuple->next; |
| kfree(victim); |
| } |
| |
| card->tuples = NULL; |
| } |
| |
| int sdio_read_func_cis(struct sdio_func *func) |
| { |
| int ret; |
| |
| ret = sdio_read_cis(func->card, func); |
| if (ret) |
| return ret; |
| |
| /* |
| * Since we've linked to tuples in the card structure, |
| * we must make sure we have a reference to it. |
| */ |
| get_device(&func->card->dev); |
| |
| /* |
| * Vendor/device id is optional for function CIS, so |
| * copy it from the card structure as needed. |
| */ |
| if (func->vendor == 0) { |
| func->vendor = func->card->cis.vendor; |
| func->device = func->card->cis.device; |
| } |
| |
| return 0; |
| } |
| |
| void sdio_free_func_cis(struct sdio_func *func) |
| { |
| struct sdio_func_tuple *tuple, *victim; |
| |
| tuple = func->tuples; |
| |
| while (tuple && tuple != func->card->tuples) { |
| victim = tuple; |
| tuple = tuple->next; |
| kfree(victim); |
| } |
| |
| func->tuples = NULL; |
| |
| /* |
| * We have now removed the link to the tuples in the |
| * card structure, so remove the reference. |
| */ |
| put_device(&func->card->dev); |
| } |
| |