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1308 lines
29 KiB
1308 lines
29 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* linux/drivers/mmc/sdio.c |
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* |
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* Copyright 2006-2007 Pierre Ossman |
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*/ |
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|
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#include <linux/err.h> |
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#include <linux/pm_runtime.h> |
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|
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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/mmc.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 <linux/mmc/sdio_ids.h> |
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|
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#include "core.h" |
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#include "card.h" |
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#include "host.h" |
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#include "bus.h" |
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#include "quirks.h" |
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#include "sd.h" |
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#include "sdio_bus.h" |
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#include "mmc_ops.h" |
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#include "sd_ops.h" |
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#include "sdio_ops.h" |
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#include "sdio_cis.h" |
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|
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MMC_DEV_ATTR(vendor, "0x%04x\n", card->cis.vendor); |
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MMC_DEV_ATTR(device, "0x%04x\n", card->cis.device); |
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MMC_DEV_ATTR(revision, "%u.%u\n", card->major_rev, card->minor_rev); |
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MMC_DEV_ATTR(ocr, "0x%08x\n", card->ocr); |
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MMC_DEV_ATTR(rca, "0x%04x\n", card->rca); |
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|
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#define sdio_info_attr(num) \ |
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static ssize_t info##num##_show(struct device *dev, struct device_attribute *attr, char *buf) \ |
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{ \ |
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struct mmc_card *card = mmc_dev_to_card(dev); \ |
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\ |
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if (num > card->num_info) \ |
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return -ENODATA; \ |
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if (!card->info[num-1][0]) \ |
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return 0; \ |
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return sprintf(buf, "%s\n", card->info[num-1]); \ |
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} \ |
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static DEVICE_ATTR_RO(info##num) |
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|
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sdio_info_attr(1); |
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sdio_info_attr(2); |
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sdio_info_attr(3); |
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sdio_info_attr(4); |
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|
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static struct attribute *sdio_std_attrs[] = { |
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&dev_attr_vendor.attr, |
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&dev_attr_device.attr, |
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&dev_attr_revision.attr, |
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&dev_attr_info1.attr, |
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&dev_attr_info2.attr, |
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&dev_attr_info3.attr, |
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&dev_attr_info4.attr, |
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&dev_attr_ocr.attr, |
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&dev_attr_rca.attr, |
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NULL, |
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}; |
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ATTRIBUTE_GROUPS(sdio_std); |
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|
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static struct device_type sdio_type = { |
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.groups = sdio_std_groups, |
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}; |
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|
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static int sdio_read_fbr(struct sdio_func *func) |
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{ |
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int ret; |
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unsigned char data; |
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|
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if (mmc_card_nonstd_func_interface(func->card)) { |
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func->class = SDIO_CLASS_NONE; |
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return 0; |
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} |
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|
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ret = mmc_io_rw_direct(func->card, 0, 0, |
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SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF, 0, &data); |
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if (ret) |
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goto out; |
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|
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data &= 0x0f; |
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|
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if (data == 0x0f) { |
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ret = mmc_io_rw_direct(func->card, 0, 0, |
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SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF_EXT, 0, &data); |
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if (ret) |
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goto out; |
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} |
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|
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func->class = data; |
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|
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out: |
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return ret; |
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} |
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|
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static int sdio_init_func(struct mmc_card *card, unsigned int fn) |
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{ |
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int ret; |
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struct sdio_func *func; |
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|
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if (WARN_ON(fn > SDIO_MAX_FUNCS)) |
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return -EINVAL; |
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|
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func = sdio_alloc_func(card); |
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if (IS_ERR(func)) |
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return PTR_ERR(func); |
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|
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func->num = fn; |
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|
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if (!(card->quirks & MMC_QUIRK_NONSTD_SDIO)) { |
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ret = sdio_read_fbr(func); |
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if (ret) |
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goto fail; |
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|
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ret = sdio_read_func_cis(func); |
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if (ret) |
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goto fail; |
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} else { |
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func->vendor = func->card->cis.vendor; |
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func->device = func->card->cis.device; |
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func->max_blksize = func->card->cis.blksize; |
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} |
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card->sdio_func[fn - 1] = func; |
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|
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return 0; |
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fail: |
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/* |
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* It is okay to remove the function here even though we hold |
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* the host lock as we haven't registered the device yet. |
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*/ |
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sdio_remove_func(func); |
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return ret; |
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} |
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static int sdio_read_cccr(struct mmc_card *card, u32 ocr) |
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{ |
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int ret; |
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int cccr_vsn; |
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int uhs = ocr & R4_18V_PRESENT; |
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unsigned char data; |
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unsigned char speed; |
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|
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ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CCCR, 0, &data); |
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if (ret) |
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goto out; |
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cccr_vsn = data & 0x0f; |
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|
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if (cccr_vsn > SDIO_CCCR_REV_3_00) { |
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pr_err("%s: unrecognised CCCR structure version %d\n", |
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mmc_hostname(card->host), cccr_vsn); |
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return -EINVAL; |
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} |
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|
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card->cccr.sdio_vsn = (data & 0xf0) >> 4; |
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|
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ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CAPS, 0, &data); |
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if (ret) |
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goto out; |
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|
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if (data & SDIO_CCCR_CAP_SMB) |
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card->cccr.multi_block = 1; |
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if (data & SDIO_CCCR_CAP_LSC) |
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card->cccr.low_speed = 1; |
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if (data & SDIO_CCCR_CAP_4BLS) |
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card->cccr.wide_bus = 1; |
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|
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if (cccr_vsn >= SDIO_CCCR_REV_1_10) { |
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ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_POWER, 0, &data); |
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if (ret) |
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goto out; |
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|
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if (data & SDIO_POWER_SMPC) |
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card->cccr.high_power = 1; |
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} |
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if (cccr_vsn >= SDIO_CCCR_REV_1_20) { |
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ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed); |
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if (ret) |
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goto out; |
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card->scr.sda_spec3 = 0; |
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card->sw_caps.sd3_bus_mode = 0; |
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card->sw_caps.sd3_drv_type = 0; |
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if (cccr_vsn >= SDIO_CCCR_REV_3_00 && uhs) { |
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card->scr.sda_spec3 = 1; |
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ret = mmc_io_rw_direct(card, 0, 0, |
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SDIO_CCCR_UHS, 0, &data); |
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if (ret) |
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goto out; |
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|
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if (mmc_host_uhs(card->host)) { |
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if (data & SDIO_UHS_DDR50) |
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card->sw_caps.sd3_bus_mode |
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|= SD_MODE_UHS_DDR50 | SD_MODE_UHS_SDR50 |
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| SD_MODE_UHS_SDR25 | SD_MODE_UHS_SDR12; |
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|
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if (data & SDIO_UHS_SDR50) |
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card->sw_caps.sd3_bus_mode |
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|= SD_MODE_UHS_SDR50 | SD_MODE_UHS_SDR25 |
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| SD_MODE_UHS_SDR12; |
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|
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if (data & SDIO_UHS_SDR104) |
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card->sw_caps.sd3_bus_mode |
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|= SD_MODE_UHS_SDR104 | SD_MODE_UHS_SDR50 |
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| SD_MODE_UHS_SDR25 | SD_MODE_UHS_SDR12; |
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} |
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ret = mmc_io_rw_direct(card, 0, 0, |
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SDIO_CCCR_DRIVE_STRENGTH, 0, &data); |
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if (ret) |
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goto out; |
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|
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if (data & SDIO_DRIVE_SDTA) |
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card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_A; |
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if (data & SDIO_DRIVE_SDTC) |
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card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_C; |
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if (data & SDIO_DRIVE_SDTD) |
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card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_D; |
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} |
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/* if no uhs mode ensure we check for high speed */ |
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if (!card->sw_caps.sd3_bus_mode) { |
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if (speed & SDIO_SPEED_SHS) { |
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card->cccr.high_speed = 1; |
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card->sw_caps.hs_max_dtr = 50000000; |
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} else { |
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card->cccr.high_speed = 0; |
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card->sw_caps.hs_max_dtr = 25000000; |
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} |
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} |
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} |
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out: |
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return ret; |
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} |
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static int sdio_enable_wide(struct mmc_card *card) |
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{ |
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int ret; |
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u8 ctrl; |
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if (!(card->host->caps & MMC_CAP_4_BIT_DATA)) |
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return 0; |
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if (card->cccr.low_speed && !card->cccr.wide_bus) |
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return 0; |
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ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl); |
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if (ret) |
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return ret; |
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if ((ctrl & SDIO_BUS_WIDTH_MASK) == SDIO_BUS_WIDTH_RESERVED) |
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pr_warn("%s: SDIO_CCCR_IF is invalid: 0x%02x\n", |
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mmc_hostname(card->host), ctrl); |
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/* set as 4-bit bus width */ |
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ctrl &= ~SDIO_BUS_WIDTH_MASK; |
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ctrl |= SDIO_BUS_WIDTH_4BIT; |
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ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL); |
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if (ret) |
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return ret; |
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return 1; |
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} |
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/* |
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* If desired, disconnect the pull-up resistor on CD/DAT[3] (pin 1) |
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* of the card. This may be required on certain setups of boards, |
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* controllers and embedded sdio device which do not need the card's |
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* pull-up. As a result, card detection is disabled and power is saved. |
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*/ |
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static int sdio_disable_cd(struct mmc_card *card) |
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{ |
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int ret; |
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u8 ctrl; |
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if (!mmc_card_disable_cd(card)) |
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return 0; |
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ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl); |
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if (ret) |
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return ret; |
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ctrl |= SDIO_BUS_CD_DISABLE; |
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return mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL); |
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} |
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/* |
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* Devices that remain active during a system suspend are |
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* put back into 1-bit mode. |
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*/ |
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static int sdio_disable_wide(struct mmc_card *card) |
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{ |
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int ret; |
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u8 ctrl; |
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if (!(card->host->caps & MMC_CAP_4_BIT_DATA)) |
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return 0; |
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if (card->cccr.low_speed && !card->cccr.wide_bus) |
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return 0; |
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ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl); |
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if (ret) |
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return ret; |
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if (!(ctrl & SDIO_BUS_WIDTH_4BIT)) |
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return 0; |
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ctrl &= ~SDIO_BUS_WIDTH_4BIT; |
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ctrl |= SDIO_BUS_ASYNC_INT; |
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ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL); |
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if (ret) |
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return ret; |
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mmc_set_bus_width(card->host, MMC_BUS_WIDTH_1); |
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return 0; |
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} |
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static int sdio_disable_4bit_bus(struct mmc_card *card) |
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{ |
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int err; |
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if (card->type == MMC_TYPE_SDIO) |
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goto out; |
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if (!(card->host->caps & MMC_CAP_4_BIT_DATA)) |
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return 0; |
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if (!(card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) |
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return 0; |
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err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_1); |
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if (err) |
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return err; |
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out: |
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return sdio_disable_wide(card); |
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} |
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static int sdio_enable_4bit_bus(struct mmc_card *card) |
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{ |
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int err; |
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err = sdio_enable_wide(card); |
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if (err <= 0) |
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return err; |
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if (card->type == MMC_TYPE_SDIO) |
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goto out; |
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if (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4) { |
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err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); |
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if (err) { |
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sdio_disable_wide(card); |
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return err; |
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} |
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} |
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out: |
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mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4); |
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return 0; |
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} |
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/* |
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* Test if the card supports high-speed mode and, if so, switch to it. |
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*/ |
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static int mmc_sdio_switch_hs(struct mmc_card *card, int enable) |
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{ |
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int ret; |
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u8 speed; |
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if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED)) |
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return 0; |
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if (!card->cccr.high_speed) |
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return 0; |
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ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed); |
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if (ret) |
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return ret; |
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if (enable) |
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speed |= SDIO_SPEED_EHS; |
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else |
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speed &= ~SDIO_SPEED_EHS; |
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ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL); |
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if (ret) |
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return ret; |
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return 1; |
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} |
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/* |
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* Enable SDIO/combo card's high-speed mode. Return 0/1 if [not]supported. |
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*/ |
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static int sdio_enable_hs(struct mmc_card *card) |
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{ |
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int ret; |
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ret = mmc_sdio_switch_hs(card, true); |
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if (ret <= 0 || card->type == MMC_TYPE_SDIO) |
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return ret; |
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ret = mmc_sd_switch_hs(card); |
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if (ret <= 0) |
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mmc_sdio_switch_hs(card, false); |
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return ret; |
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} |
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static unsigned mmc_sdio_get_max_clock(struct mmc_card *card) |
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{ |
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unsigned max_dtr; |
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|
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if (mmc_card_hs(card)) { |
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/* |
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* The SDIO specification doesn't mention how |
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* the CIS transfer speed register relates to |
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* high-speed, but it seems that 50 MHz is |
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* mandatory. |
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*/ |
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max_dtr = 50000000; |
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} else { |
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max_dtr = card->cis.max_dtr; |
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} |
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|
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if (card->type == MMC_TYPE_SD_COMBO) |
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max_dtr = min(max_dtr, mmc_sd_get_max_clock(card)); |
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|
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return max_dtr; |
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} |
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|
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static unsigned char host_drive_to_sdio_drive(int host_strength) |
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{ |
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switch (host_strength) { |
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case MMC_SET_DRIVER_TYPE_A: |
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return SDIO_DTSx_SET_TYPE_A; |
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case MMC_SET_DRIVER_TYPE_B: |
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return SDIO_DTSx_SET_TYPE_B; |
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case MMC_SET_DRIVER_TYPE_C: |
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return SDIO_DTSx_SET_TYPE_C; |
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case MMC_SET_DRIVER_TYPE_D: |
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return SDIO_DTSx_SET_TYPE_D; |
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default: |
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return SDIO_DTSx_SET_TYPE_B; |
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} |
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} |
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|
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static void sdio_select_driver_type(struct mmc_card *card) |
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{ |
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int card_drv_type, drive_strength, drv_type; |
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unsigned char card_strength; |
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int err; |
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|
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card->drive_strength = 0; |
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|
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card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B; |
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|
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drive_strength = mmc_select_drive_strength(card, |
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card->sw_caps.uhs_max_dtr, |
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card_drv_type, &drv_type); |
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|
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if (drive_strength) { |
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/* if error just use default for drive strength B */ |
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err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_DRIVE_STRENGTH, 0, |
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&card_strength); |
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if (err) |
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return; |
|
|
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card_strength &= ~(SDIO_DRIVE_DTSx_MASK<<SDIO_DRIVE_DTSx_SHIFT); |
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card_strength |= host_drive_to_sdio_drive(drive_strength); |
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|
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/* if error default to drive strength B */ |
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err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_DRIVE_STRENGTH, |
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card_strength, NULL); |
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if (err) |
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return; |
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card->drive_strength = drive_strength; |
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} |
|
|
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if (drv_type) |
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mmc_set_driver_type(card->host, drv_type); |
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} |
|
|
|
|
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static int sdio_set_bus_speed_mode(struct mmc_card *card) |
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{ |
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unsigned int bus_speed, timing; |
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int err; |
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unsigned char speed; |
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unsigned int max_rate; |
|
|
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/* |
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* If the host doesn't support any of the UHS-I modes, fallback on |
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* default speed. |
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*/ |
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if (!mmc_host_uhs(card->host)) |
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return 0; |
|
|
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bus_speed = SDIO_SPEED_SDR12; |
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timing = MMC_TIMING_UHS_SDR12; |
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if ((card->host->caps & MMC_CAP_UHS_SDR104) && |
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(card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) { |
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bus_speed = SDIO_SPEED_SDR104; |
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timing = MMC_TIMING_UHS_SDR104; |
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card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR; |
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card->sd_bus_speed = UHS_SDR104_BUS_SPEED; |
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} else if ((card->host->caps & MMC_CAP_UHS_DDR50) && |
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(card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) { |
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bus_speed = SDIO_SPEED_DDR50; |
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timing = MMC_TIMING_UHS_DDR50; |
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card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR; |
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card->sd_bus_speed = UHS_DDR50_BUS_SPEED; |
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} else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | |
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MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode & |
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SD_MODE_UHS_SDR50)) { |
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bus_speed = SDIO_SPEED_SDR50; |
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timing = MMC_TIMING_UHS_SDR50; |
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card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR; |
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card->sd_bus_speed = UHS_SDR50_BUS_SPEED; |
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} else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | |
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MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) && |
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(card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) { |
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bus_speed = SDIO_SPEED_SDR25; |
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timing = MMC_TIMING_UHS_SDR25; |
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card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR; |
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card->sd_bus_speed = UHS_SDR25_BUS_SPEED; |
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} else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | |
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MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 | |
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MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode & |
|
SD_MODE_UHS_SDR12)) { |
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bus_speed = SDIO_SPEED_SDR12; |
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timing = MMC_TIMING_UHS_SDR12; |
|
card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR; |
|
card->sd_bus_speed = UHS_SDR12_BUS_SPEED; |
|
} |
|
|
|
err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed); |
|
if (err) |
|
return err; |
|
|
|
speed &= ~SDIO_SPEED_BSS_MASK; |
|
speed |= bus_speed; |
|
err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL); |
|
if (err) |
|
return err; |
|
|
|
max_rate = min_not_zero(card->quirk_max_rate, |
|
card->sw_caps.uhs_max_dtr); |
|
|
|
mmc_set_timing(card->host, timing); |
|
mmc_set_clock(card->host, max_rate); |
|
|
|
return 0; |
|
} |
|
|
|
/* |
|
* UHS-I specific initialization procedure |
|
*/ |
|
static int mmc_sdio_init_uhs_card(struct mmc_card *card) |
|
{ |
|
int err; |
|
|
|
if (!card->scr.sda_spec3) |
|
return 0; |
|
|
|
/* Switch to wider bus */ |
|
err = sdio_enable_4bit_bus(card); |
|
if (err) |
|
goto out; |
|
|
|
/* Set the driver strength for the card */ |
|
sdio_select_driver_type(card); |
|
|
|
/* Set bus speed mode of the card */ |
|
err = sdio_set_bus_speed_mode(card); |
|
if (err) |
|
goto out; |
|
|
|
/* |
|
* SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and |
|
* SDR104 mode SD-cards. Note that tuning is mandatory for SDR104. |
|
*/ |
|
if (!mmc_host_is_spi(card->host) && |
|
((card->host->ios.timing == MMC_TIMING_UHS_SDR50) || |
|
(card->host->ios.timing == MMC_TIMING_UHS_SDR104))) |
|
err = mmc_execute_tuning(card); |
|
out: |
|
return err; |
|
} |
|
|
|
static int mmc_sdio_pre_init(struct mmc_host *host, u32 ocr, |
|
struct mmc_card *card) |
|
{ |
|
if (card) |
|
mmc_remove_card(card); |
|
|
|
/* |
|
* Reset the card by performing the same steps that are taken by |
|
* mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe. |
|
* |
|
* sdio_reset() is technically not needed. Having just powered up the |
|
* hardware, it should already be in reset state. However, some |
|
* platforms (such as SD8686 on OLPC) do not instantly cut power, |
|
* meaning that a reset is required when restoring power soon after |
|
* powering off. It is harmless in other cases. |
|
* |
|
* The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec, |
|
* is not necessary for non-removable cards. However, it is required |
|
* for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and |
|
* harmless in other situations. |
|
* |
|
*/ |
|
|
|
sdio_reset(host); |
|
mmc_go_idle(host); |
|
mmc_send_if_cond(host, ocr); |
|
return mmc_send_io_op_cond(host, 0, NULL); |
|
} |
|
|
|
/* |
|
* Handle the detection and initialisation of a card. |
|
* |
|
* In the case of a resume, "oldcard" will contain the card |
|
* we're trying to reinitialise. |
|
*/ |
|
static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr, |
|
struct mmc_card *oldcard) |
|
{ |
|
struct mmc_card *card; |
|
int err; |
|
int retries = 10; |
|
u32 rocr = 0; |
|
u32 ocr_card = ocr; |
|
|
|
WARN_ON(!host->claimed); |
|
|
|
/* to query card if 1.8V signalling is supported */ |
|
if (mmc_host_uhs(host)) |
|
ocr |= R4_18V_PRESENT; |
|
|
|
try_again: |
|
if (!retries) { |
|
pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host)); |
|
ocr &= ~R4_18V_PRESENT; |
|
} |
|
|
|
/* |
|
* Inform the card of the voltage |
|
*/ |
|
err = mmc_send_io_op_cond(host, ocr, &rocr); |
|
if (err) |
|
return err; |
|
|
|
/* |
|
* For SPI, enable CRC as appropriate. |
|
*/ |
|
if (mmc_host_is_spi(host)) { |
|
err = mmc_spi_set_crc(host, use_spi_crc); |
|
if (err) |
|
return err; |
|
} |
|
|
|
/* |
|
* Allocate card structure. |
|
*/ |
|
card = mmc_alloc_card(host, &sdio_type); |
|
if (IS_ERR(card)) |
|
return PTR_ERR(card); |
|
|
|
if ((rocr & R4_MEMORY_PRESENT) && |
|
mmc_sd_get_cid(host, ocr & rocr, card->raw_cid, NULL) == 0) { |
|
card->type = MMC_TYPE_SD_COMBO; |
|
|
|
if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO || |
|
memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) { |
|
err = -ENOENT; |
|
goto mismatch; |
|
} |
|
} else { |
|
card->type = MMC_TYPE_SDIO; |
|
|
|
if (oldcard && oldcard->type != MMC_TYPE_SDIO) { |
|
err = -ENOENT; |
|
goto mismatch; |
|
} |
|
} |
|
|
|
/* |
|
* Call the optional HC's init_card function to handle quirks. |
|
*/ |
|
if (host->ops->init_card) |
|
host->ops->init_card(host, card); |
|
|
|
/* |
|
* If the host and card support UHS-I mode request the card |
|
* to switch to 1.8V signaling level. No 1.8v signalling if |
|
* UHS mode is not enabled to maintain compatibility and some |
|
* systems that claim 1.8v signalling in fact do not support |
|
* it. Per SDIO spec v3, section 3.1.2, if the voltage is already |
|
* 1.8v, the card sets S18A to 0 in the R4 response. So it will |
|
* fails to check rocr & R4_18V_PRESENT, but we still need to |
|
* try to init uhs card. sdio_read_cccr will take over this task |
|
* to make sure which speed mode should work. |
|
*/ |
|
if (rocr & ocr & R4_18V_PRESENT) { |
|
err = mmc_set_uhs_voltage(host, ocr_card); |
|
if (err == -EAGAIN) { |
|
mmc_sdio_pre_init(host, ocr_card, card); |
|
retries--; |
|
goto try_again; |
|
} else if (err) { |
|
ocr &= ~R4_18V_PRESENT; |
|
} |
|
} |
|
|
|
/* |
|
* For native busses: set card RCA and quit open drain mode. |
|
*/ |
|
if (!mmc_host_is_spi(host)) { |
|
err = mmc_send_relative_addr(host, &card->rca); |
|
if (err) |
|
goto remove; |
|
|
|
/* |
|
* Update oldcard with the new RCA received from the SDIO |
|
* device -- we're doing this so that it's updated in the |
|
* "card" struct when oldcard overwrites that later. |
|
*/ |
|
if (oldcard) |
|
oldcard->rca = card->rca; |
|
} |
|
|
|
/* |
|
* Read CSD, before selecting the card |
|
*/ |
|
if (!oldcard && card->type == MMC_TYPE_SD_COMBO) { |
|
err = mmc_sd_get_csd(card); |
|
if (err) |
|
goto remove; |
|
|
|
mmc_decode_cid(card); |
|
} |
|
|
|
/* |
|
* Select card, as all following commands rely on that. |
|
*/ |
|
if (!mmc_host_is_spi(host)) { |
|
err = mmc_select_card(card); |
|
if (err) |
|
goto remove; |
|
} |
|
|
|
if (card->quirks & MMC_QUIRK_NONSTD_SDIO) { |
|
/* |
|
* This is non-standard SDIO device, meaning it doesn't |
|
* have any CIA (Common I/O area) registers present. |
|
* It's host's responsibility to fill cccr and cis |
|
* structures in init_card(). |
|
*/ |
|
mmc_set_clock(host, card->cis.max_dtr); |
|
|
|
if (card->cccr.high_speed) { |
|
mmc_set_timing(card->host, MMC_TIMING_SD_HS); |
|
} |
|
|
|
if (oldcard) |
|
mmc_remove_card(card); |
|
else |
|
host->card = card; |
|
|
|
return 0; |
|
} |
|
|
|
/* |
|
* Read the common registers. Note that we should try to |
|
* validate whether UHS would work or not. |
|
*/ |
|
err = sdio_read_cccr(card, ocr); |
|
if (err) { |
|
mmc_sdio_pre_init(host, ocr_card, card); |
|
if (ocr & R4_18V_PRESENT) { |
|
/* Retry init sequence, but without R4_18V_PRESENT. */ |
|
retries = 0; |
|
goto try_again; |
|
} |
|
return err; |
|
} |
|
|
|
/* |
|
* Read the common CIS tuples. |
|
*/ |
|
err = sdio_read_common_cis(card); |
|
if (err) |
|
goto remove; |
|
|
|
if (oldcard) { |
|
if (card->cis.vendor == oldcard->cis.vendor && |
|
card->cis.device == oldcard->cis.device) { |
|
mmc_remove_card(card); |
|
card = oldcard; |
|
} else { |
|
err = -ENOENT; |
|
goto mismatch; |
|
} |
|
} |
|
card->ocr = ocr_card; |
|
mmc_fixup_device(card, sdio_fixup_methods); |
|
|
|
if (card->type == MMC_TYPE_SD_COMBO) { |
|
err = mmc_sd_setup_card(host, card, oldcard != NULL); |
|
/* handle as SDIO-only card if memory init failed */ |
|
if (err) { |
|
mmc_go_idle(host); |
|
if (mmc_host_is_spi(host)) |
|
/* should not fail, as it worked previously */ |
|
mmc_spi_set_crc(host, use_spi_crc); |
|
card->type = MMC_TYPE_SDIO; |
|
} else |
|
card->dev.type = &sd_type; |
|
} |
|
|
|
/* |
|
* If needed, disconnect card detection pull-up resistor. |
|
*/ |
|
err = sdio_disable_cd(card); |
|
if (err) |
|
goto remove; |
|
|
|
/* Initialization sequence for UHS-I cards */ |
|
/* Only if card supports 1.8v and UHS signaling */ |
|
if ((ocr & R4_18V_PRESENT) && card->sw_caps.sd3_bus_mode) { |
|
err = mmc_sdio_init_uhs_card(card); |
|
if (err) |
|
goto remove; |
|
} else { |
|
/* |
|
* Switch to high-speed (if supported). |
|
*/ |
|
err = sdio_enable_hs(card); |
|
if (err > 0) |
|
mmc_set_timing(card->host, MMC_TIMING_SD_HS); |
|
else if (err) |
|
goto remove; |
|
|
|
/* |
|
* Change to the card's maximum speed. |
|
*/ |
|
mmc_set_clock(host, mmc_sdio_get_max_clock(card)); |
|
|
|
/* |
|
* Switch to wider bus (if supported). |
|
*/ |
|
err = sdio_enable_4bit_bus(card); |
|
if (err) |
|
goto remove; |
|
} |
|
|
|
if (host->caps2 & MMC_CAP2_AVOID_3_3V && |
|
host->ios.signal_voltage == MMC_SIGNAL_VOLTAGE_330) { |
|
pr_err("%s: Host failed to negotiate down from 3.3V\n", |
|
mmc_hostname(host)); |
|
err = -EINVAL; |
|
goto remove; |
|
} |
|
|
|
host->card = card; |
|
return 0; |
|
|
|
mismatch: |
|
pr_debug("%s: Perhaps the card was replaced\n", mmc_hostname(host)); |
|
remove: |
|
if (oldcard != card) |
|
mmc_remove_card(card); |
|
return err; |
|
} |
|
|
|
static int mmc_sdio_reinit_card(struct mmc_host *host) |
|
{ |
|
int ret; |
|
|
|
ret = mmc_sdio_pre_init(host, host->card->ocr, NULL); |
|
if (ret) |
|
return ret; |
|
|
|
return mmc_sdio_init_card(host, host->card->ocr, host->card); |
|
} |
|
|
|
/* |
|
* Host is being removed. Free up the current card. |
|
*/ |
|
static void mmc_sdio_remove(struct mmc_host *host) |
|
{ |
|
int i; |
|
|
|
for (i = 0;i < host->card->sdio_funcs;i++) { |
|
if (host->card->sdio_func[i]) { |
|
sdio_remove_func(host->card->sdio_func[i]); |
|
host->card->sdio_func[i] = NULL; |
|
} |
|
} |
|
|
|
mmc_remove_card(host->card); |
|
host->card = NULL; |
|
} |
|
|
|
/* |
|
* Card detection - card is alive. |
|
*/ |
|
static int mmc_sdio_alive(struct mmc_host *host) |
|
{ |
|
return mmc_select_card(host->card); |
|
} |
|
|
|
/* |
|
* Card detection callback from host. |
|
*/ |
|
static void mmc_sdio_detect(struct mmc_host *host) |
|
{ |
|
int err; |
|
|
|
/* Make sure card is powered before detecting it */ |
|
if (host->caps & MMC_CAP_POWER_OFF_CARD) { |
|
err = pm_runtime_get_sync(&host->card->dev); |
|
if (err < 0) { |
|
pm_runtime_put_noidle(&host->card->dev); |
|
goto out; |
|
} |
|
} |
|
|
|
mmc_claim_host(host); |
|
|
|
/* |
|
* Just check if our card has been removed. |
|
*/ |
|
err = _mmc_detect_card_removed(host); |
|
|
|
mmc_release_host(host); |
|
|
|
/* |
|
* Tell PM core it's OK to power off the card now. |
|
* |
|
* The _sync variant is used in order to ensure that the card |
|
* is left powered off in case an error occurred, and the card |
|
* is going to be removed. |
|
* |
|
* Since there is no specific reason to believe a new user |
|
* is about to show up at this point, the _sync variant is |
|
* desirable anyway. |
|
*/ |
|
if (host->caps & MMC_CAP_POWER_OFF_CARD) |
|
pm_runtime_put_sync(&host->card->dev); |
|
|
|
out: |
|
if (err) { |
|
mmc_sdio_remove(host); |
|
|
|
mmc_claim_host(host); |
|
mmc_detach_bus(host); |
|
mmc_power_off(host); |
|
mmc_release_host(host); |
|
} |
|
} |
|
|
|
/* |
|
* SDIO pre_suspend. We need to suspend all functions separately. |
|
* Therefore all registered functions must have drivers with suspend |
|
* and resume methods. Failing that we simply remove the whole card. |
|
*/ |
|
static int mmc_sdio_pre_suspend(struct mmc_host *host) |
|
{ |
|
int i; |
|
|
|
for (i = 0; i < host->card->sdio_funcs; i++) { |
|
struct sdio_func *func = host->card->sdio_func[i]; |
|
if (func && sdio_func_present(func) && func->dev.driver) { |
|
const struct dev_pm_ops *pmops = func->dev.driver->pm; |
|
if (!pmops || !pmops->suspend || !pmops->resume) |
|
/* force removal of entire card in that case */ |
|
goto remove; |
|
} |
|
} |
|
|
|
return 0; |
|
|
|
remove: |
|
if (!mmc_card_is_removable(host)) { |
|
dev_warn(mmc_dev(host), |
|
"missing suspend/resume ops for non-removable SDIO card\n"); |
|
/* Don't remove a non-removable card - we can't re-detect it. */ |
|
return 0; |
|
} |
|
|
|
/* Remove the SDIO card and let it be re-detected later on. */ |
|
mmc_sdio_remove(host); |
|
mmc_claim_host(host); |
|
mmc_detach_bus(host); |
|
mmc_power_off(host); |
|
mmc_release_host(host); |
|
host->pm_flags = 0; |
|
|
|
return 0; |
|
} |
|
|
|
/* |
|
* SDIO suspend. Suspend all functions separately. |
|
*/ |
|
static int mmc_sdio_suspend(struct mmc_host *host) |
|
{ |
|
WARN_ON(host->sdio_irqs && !mmc_card_keep_power(host)); |
|
|
|
/* Prevent processing of SDIO IRQs in suspended state. */ |
|
mmc_card_set_suspended(host->card); |
|
cancel_delayed_work_sync(&host->sdio_irq_work); |
|
|
|
mmc_claim_host(host); |
|
|
|
if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) |
|
sdio_disable_4bit_bus(host->card); |
|
|
|
if (!mmc_card_keep_power(host)) { |
|
mmc_power_off(host); |
|
} else if (host->retune_period) { |
|
mmc_retune_timer_stop(host); |
|
mmc_retune_needed(host); |
|
} |
|
|
|
mmc_release_host(host); |
|
|
|
return 0; |
|
} |
|
|
|
static int mmc_sdio_resume(struct mmc_host *host) |
|
{ |
|
int err = 0; |
|
|
|
/* Basic card reinitialization. */ |
|
mmc_claim_host(host); |
|
|
|
/* |
|
* Restore power and reinitialize the card when needed. Note that a |
|
* removable card is checked from a detect work later on in the resume |
|
* process. |
|
*/ |
|
if (!mmc_card_keep_power(host)) { |
|
mmc_power_up(host, host->card->ocr); |
|
/* |
|
* Tell runtime PM core we just powered up the card, |
|
* since it still believes the card is powered off. |
|
* Note that currently runtime PM is only enabled |
|
* for SDIO cards that are MMC_CAP_POWER_OFF_CARD |
|
*/ |
|
if (host->caps & MMC_CAP_POWER_OFF_CARD) { |
|
pm_runtime_disable(&host->card->dev); |
|
pm_runtime_set_active(&host->card->dev); |
|
pm_runtime_enable(&host->card->dev); |
|
} |
|
err = mmc_sdio_reinit_card(host); |
|
} else if (mmc_card_wake_sdio_irq(host)) { |
|
/* We may have switched to 1-bit mode during suspend */ |
|
err = sdio_enable_4bit_bus(host->card); |
|
} |
|
|
|
if (err) |
|
goto out; |
|
|
|
/* Allow SDIO IRQs to be processed again. */ |
|
mmc_card_clr_suspended(host->card); |
|
|
|
if (host->sdio_irqs) { |
|
if (!(host->caps2 & MMC_CAP2_SDIO_IRQ_NOTHREAD)) |
|
wake_up_process(host->sdio_irq_thread); |
|
else if (host->caps & MMC_CAP_SDIO_IRQ) |
|
queue_delayed_work(system_wq, &host->sdio_irq_work, 0); |
|
} |
|
|
|
out: |
|
mmc_release_host(host); |
|
|
|
host->pm_flags &= ~MMC_PM_KEEP_POWER; |
|
return err; |
|
} |
|
|
|
static int mmc_sdio_runtime_suspend(struct mmc_host *host) |
|
{ |
|
/* No references to the card, cut the power to it. */ |
|
mmc_claim_host(host); |
|
mmc_power_off(host); |
|
mmc_release_host(host); |
|
|
|
return 0; |
|
} |
|
|
|
static int mmc_sdio_runtime_resume(struct mmc_host *host) |
|
{ |
|
int ret; |
|
|
|
/* Restore power and re-initialize. */ |
|
mmc_claim_host(host); |
|
mmc_power_up(host, host->card->ocr); |
|
ret = mmc_sdio_reinit_card(host); |
|
mmc_release_host(host); |
|
|
|
return ret; |
|
} |
|
|
|
/* |
|
* SDIO HW reset |
|
* |
|
* Returns 0 if the HW reset was executed synchronously, returns 1 if the HW |
|
* reset was asynchronously scheduled, else a negative error code. |
|
*/ |
|
static int mmc_sdio_hw_reset(struct mmc_host *host) |
|
{ |
|
struct mmc_card *card = host->card; |
|
|
|
/* |
|
* In case the card is shared among multiple func drivers, reset the |
|
* card through a rescan work. In this way it will be removed and |
|
* re-detected, thus all func drivers becomes informed about it. |
|
*/ |
|
if (atomic_read(&card->sdio_funcs_probed) > 1) { |
|
if (mmc_card_removed(card)) |
|
return 1; |
|
host->rescan_entered = 0; |
|
mmc_card_set_removed(card); |
|
_mmc_detect_change(host, 0, false); |
|
return 1; |
|
} |
|
|
|
/* |
|
* A single func driver has been probed, then let's skip the heavy |
|
* hotplug dance above and execute the reset immediately. |
|
*/ |
|
mmc_power_cycle(host, card->ocr); |
|
return mmc_sdio_reinit_card(host); |
|
} |
|
|
|
static int mmc_sdio_sw_reset(struct mmc_host *host) |
|
{ |
|
mmc_set_clock(host, host->f_init); |
|
sdio_reset(host); |
|
mmc_go_idle(host); |
|
|
|
mmc_set_initial_state(host); |
|
mmc_set_initial_signal_voltage(host); |
|
|
|
return mmc_sdio_reinit_card(host); |
|
} |
|
|
|
static const struct mmc_bus_ops mmc_sdio_ops = { |
|
.remove = mmc_sdio_remove, |
|
.detect = mmc_sdio_detect, |
|
.pre_suspend = mmc_sdio_pre_suspend, |
|
.suspend = mmc_sdio_suspend, |
|
.resume = mmc_sdio_resume, |
|
.runtime_suspend = mmc_sdio_runtime_suspend, |
|
.runtime_resume = mmc_sdio_runtime_resume, |
|
.alive = mmc_sdio_alive, |
|
.hw_reset = mmc_sdio_hw_reset, |
|
.sw_reset = mmc_sdio_sw_reset, |
|
}; |
|
|
|
|
|
/* |
|
* Starting point for SDIO card init. |
|
*/ |
|
int mmc_attach_sdio(struct mmc_host *host) |
|
{ |
|
int err, i, funcs; |
|
u32 ocr, rocr; |
|
struct mmc_card *card; |
|
|
|
WARN_ON(!host->claimed); |
|
|
|
err = mmc_send_io_op_cond(host, 0, &ocr); |
|
if (err) |
|
return err; |
|
|
|
mmc_attach_bus(host, &mmc_sdio_ops); |
|
if (host->ocr_avail_sdio) |
|
host->ocr_avail = host->ocr_avail_sdio; |
|
|
|
|
|
rocr = mmc_select_voltage(host, ocr); |
|
|
|
/* |
|
* Can we support the voltage(s) of the card(s)? |
|
*/ |
|
if (!rocr) { |
|
err = -EINVAL; |
|
goto err; |
|
} |
|
|
|
/* |
|
* Detect and init the card. |
|
*/ |
|
err = mmc_sdio_init_card(host, rocr, NULL); |
|
if (err) |
|
goto err; |
|
|
|
card = host->card; |
|
|
|
/* |
|
* Enable runtime PM only if supported by host+card+board |
|
*/ |
|
if (host->caps & MMC_CAP_POWER_OFF_CARD) { |
|
/* |
|
* Do not allow runtime suspend until after SDIO function |
|
* devices are added. |
|
*/ |
|
pm_runtime_get_noresume(&card->dev); |
|
|
|
/* |
|
* Let runtime PM core know our card is active |
|
*/ |
|
err = pm_runtime_set_active(&card->dev); |
|
if (err) |
|
goto remove; |
|
|
|
/* |
|
* Enable runtime PM for this card |
|
*/ |
|
pm_runtime_enable(&card->dev); |
|
} |
|
|
|
/* |
|
* The number of functions on the card is encoded inside |
|
* the ocr. |
|
*/ |
|
funcs = (ocr & 0x70000000) >> 28; |
|
card->sdio_funcs = 0; |
|
|
|
/* |
|
* Initialize (but don't add) all present functions. |
|
*/ |
|
for (i = 0; i < funcs; i++, card->sdio_funcs++) { |
|
err = sdio_init_func(host->card, i + 1); |
|
if (err) |
|
goto remove; |
|
|
|
/* |
|
* Enable Runtime PM for this func (if supported) |
|
*/ |
|
if (host->caps & MMC_CAP_POWER_OFF_CARD) |
|
pm_runtime_enable(&card->sdio_func[i]->dev); |
|
} |
|
|
|
/* |
|
* First add the card to the driver model... |
|
*/ |
|
mmc_release_host(host); |
|
err = mmc_add_card(host->card); |
|
if (err) |
|
goto remove_added; |
|
|
|
/* |
|
* ...then the SDIO functions. |
|
*/ |
|
for (i = 0;i < funcs;i++) { |
|
err = sdio_add_func(host->card->sdio_func[i]); |
|
if (err) |
|
goto remove_added; |
|
} |
|
|
|
if (host->caps & MMC_CAP_POWER_OFF_CARD) |
|
pm_runtime_put(&card->dev); |
|
|
|
mmc_claim_host(host); |
|
return 0; |
|
|
|
|
|
remove: |
|
mmc_release_host(host); |
|
remove_added: |
|
/* |
|
* The devices are being deleted so it is not necessary to disable |
|
* runtime PM. Similarly we also don't pm_runtime_put() the SDIO card |
|
* because it needs to be active to remove any function devices that |
|
* were probed, and after that it gets deleted. |
|
*/ |
|
mmc_sdio_remove(host); |
|
mmc_claim_host(host); |
|
err: |
|
mmc_detach_bus(host); |
|
|
|
pr_err("%s: error %d whilst initialising SDIO card\n", |
|
mmc_hostname(host), err); |
|
|
|
return err; |
|
} |
|
|
|
|