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217 lines
4.6 KiB
217 lines
4.6 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* linux/drivers/mmc/sdio_ops.c |
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* |
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* Copyright 2006-2007 Pierre Ossman |
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*/ |
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#include <linux/scatterlist.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/mmc.h> |
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#include <linux/mmc/sdio.h> |
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#include "core.h" |
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#include "sdio_ops.h" |
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int mmc_send_io_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr) |
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{ |
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struct mmc_command cmd = {}; |
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int i, err = 0; |
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cmd.opcode = SD_IO_SEND_OP_COND; |
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cmd.arg = ocr; |
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cmd.flags = MMC_RSP_SPI_R4 | MMC_RSP_R4 | MMC_CMD_BCR; |
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for (i = 100; i; i--) { |
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err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES); |
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if (err) |
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break; |
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/* if we're just probing, do a single pass */ |
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if (ocr == 0) |
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break; |
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/* otherwise wait until reset completes */ |
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if (mmc_host_is_spi(host)) { |
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/* |
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* Both R1_SPI_IDLE and MMC_CARD_BUSY indicate |
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* an initialized card under SPI, but some cards |
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* (Marvell's) only behave when looking at this |
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* one. |
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*/ |
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if (cmd.resp[1] & MMC_CARD_BUSY) |
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break; |
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} else { |
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if (cmd.resp[0] & MMC_CARD_BUSY) |
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break; |
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} |
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err = -ETIMEDOUT; |
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mmc_delay(10); |
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} |
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if (rocr) |
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*rocr = cmd.resp[mmc_host_is_spi(host) ? 1 : 0]; |
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return err; |
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} |
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static int mmc_io_rw_direct_host(struct mmc_host *host, int write, unsigned fn, |
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unsigned addr, u8 in, u8 *out) |
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{ |
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struct mmc_command cmd = {}; |
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int err; |
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if (fn > 7) |
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return -EINVAL; |
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/* sanity check */ |
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if (addr & ~0x1FFFF) |
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return -EINVAL; |
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cmd.opcode = SD_IO_RW_DIRECT; |
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cmd.arg = write ? 0x80000000 : 0x00000000; |
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cmd.arg |= fn << 28; |
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cmd.arg |= (write && out) ? 0x08000000 : 0x00000000; |
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cmd.arg |= addr << 9; |
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cmd.arg |= in; |
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cmd.flags = MMC_RSP_SPI_R5 | MMC_RSP_R5 | MMC_CMD_AC; |
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err = mmc_wait_for_cmd(host, &cmd, 0); |
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if (err) |
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return err; |
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if (mmc_host_is_spi(host)) { |
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/* host driver already reported errors */ |
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} else { |
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if (cmd.resp[0] & R5_ERROR) |
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return -EIO; |
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if (cmd.resp[0] & R5_FUNCTION_NUMBER) |
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return -EINVAL; |
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if (cmd.resp[0] & R5_OUT_OF_RANGE) |
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return -ERANGE; |
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} |
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if (out) { |
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if (mmc_host_is_spi(host)) |
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*out = (cmd.resp[0] >> 8) & 0xFF; |
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else |
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*out = cmd.resp[0] & 0xFF; |
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} |
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return 0; |
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} |
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int mmc_io_rw_direct(struct mmc_card *card, int write, unsigned fn, |
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unsigned addr, u8 in, u8 *out) |
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{ |
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return mmc_io_rw_direct_host(card->host, write, fn, addr, in, out); |
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} |
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int mmc_io_rw_extended(struct mmc_card *card, int write, unsigned fn, |
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unsigned addr, int incr_addr, u8 *buf, unsigned blocks, unsigned blksz) |
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{ |
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struct mmc_request mrq = {}; |
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struct mmc_command cmd = {}; |
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struct mmc_data data = {}; |
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struct scatterlist sg, *sg_ptr; |
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struct sg_table sgtable; |
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unsigned int nents, left_size, i; |
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unsigned int seg_size = card->host->max_seg_size; |
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int err; |
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WARN_ON(blksz == 0); |
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/* sanity check */ |
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if (addr & ~0x1FFFF) |
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return -EINVAL; |
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mrq.cmd = &cmd; |
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mrq.data = &data; |
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cmd.opcode = SD_IO_RW_EXTENDED; |
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cmd.arg = write ? 0x80000000 : 0x00000000; |
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cmd.arg |= fn << 28; |
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cmd.arg |= incr_addr ? 0x04000000 : 0x00000000; |
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cmd.arg |= addr << 9; |
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if (blocks == 0) |
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cmd.arg |= (blksz == 512) ? 0 : blksz; /* byte mode */ |
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else |
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cmd.arg |= 0x08000000 | blocks; /* block mode */ |
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cmd.flags = MMC_RSP_SPI_R5 | MMC_RSP_R5 | MMC_CMD_ADTC; |
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data.blksz = blksz; |
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/* Code in host drivers/fwk assumes that "blocks" always is >=1 */ |
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data.blocks = blocks ? blocks : 1; |
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data.flags = write ? MMC_DATA_WRITE : MMC_DATA_READ; |
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left_size = data.blksz * data.blocks; |
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nents = DIV_ROUND_UP(left_size, seg_size); |
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if (nents > 1) { |
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if (sg_alloc_table(&sgtable, nents, GFP_KERNEL)) |
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return -ENOMEM; |
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data.sg = sgtable.sgl; |
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data.sg_len = nents; |
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for_each_sg(data.sg, sg_ptr, data.sg_len, i) { |
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sg_set_buf(sg_ptr, buf + i * seg_size, |
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min(seg_size, left_size)); |
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left_size -= seg_size; |
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} |
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} else { |
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data.sg = &sg; |
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data.sg_len = 1; |
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sg_init_one(&sg, buf, left_size); |
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} |
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mmc_set_data_timeout(&data, card); |
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mmc_pre_req(card->host, &mrq); |
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mmc_wait_for_req(card->host, &mrq); |
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if (cmd.error) |
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err = cmd.error; |
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else if (data.error) |
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err = data.error; |
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else if (mmc_host_is_spi(card->host)) |
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/* host driver already reported errors */ |
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err = 0; |
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else if (cmd.resp[0] & R5_ERROR) |
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err = -EIO; |
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else if (cmd.resp[0] & R5_FUNCTION_NUMBER) |
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err = -EINVAL; |
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else if (cmd.resp[0] & R5_OUT_OF_RANGE) |
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err = -ERANGE; |
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else |
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err = 0; |
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mmc_post_req(card->host, &mrq, err); |
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if (nents > 1) |
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sg_free_table(&sgtable); |
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return err; |
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} |
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int sdio_reset(struct mmc_host *host) |
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{ |
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int ret; |
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u8 abort; |
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/* SDIO Simplified Specification V2.0, 4.4 Reset for SDIO */ |
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ret = mmc_io_rw_direct_host(host, 0, 0, SDIO_CCCR_ABORT, 0, &abort); |
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if (ret) |
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abort = 0x08; |
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else |
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abort |= 0x08; |
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return mmc_io_rw_direct_host(host, 1, 0, SDIO_CCCR_ABORT, abort, NULL); |
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} |
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