![Heiner Kallweit](/assets/img/avatar_default.png)
Improve mmc_io_rw_extended a little: - using DIV_ROUND_UP achieves the same but is better readable - simplify code by using sg_set_buf - simplify one statement by using -= operator Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
217 lines
4.7 KiB
C
217 lines
4.7 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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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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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_wait_for_req(card->host, &mrq);
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if (nents > 1)
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sg_free_table(&sgtable);
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if (cmd.error)
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return cmd.error;
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if (data.error)
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return data.error;
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if (mmc_host_is_spi(card->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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return 0;
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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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