mirror of
https://github.com/edk2-porting/linux-next.git
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0f77934ab8
Local variable transfer_error is assigned to a constant value and it is never updated again. Remove this variable and the dead code it guards. Addresses-Coverity-ID: 1222110 Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
559 lines
14 KiB
C
559 lines
14 KiB
C
/*
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* Copyright 2007, Google Inc.
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* Copyright 2012, Intel Inc.
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*
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* based on omap.c driver, which was
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* Copyright (C) 2004 Nokia Corporation
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* Written by Tuukka Tikkanen and Juha Yrjölä <juha.yrjola@nokia.com>
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* Misc hacks here and there by Tony Lindgren <tony@atomide.com>
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* Other hacks (DMA, SD, etc) by David Brownell
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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 version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/major.h>
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#include <linux/types.h>
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#include <linux/pci.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/fs.h>
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#include <linux/errno.h>
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#include <linux/hdreg.h>
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#include <linux/kdev_t.h>
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#include <linux/blkdev.h>
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#include <linux/mutex.h>
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#include <linux/scatterlist.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/host.h>
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#include <linux/mmc/card.h>
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#include <linux/moduleparam.h>
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#include <linux/init.h>
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#include <linux/ioport.h>
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#include <linux/dma-mapping.h>
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#include <linux/delay.h>
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#include <linux/spinlock.h>
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#include <linux/timer.h>
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#include <linux/clk.h>
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#include <linux/scatterlist.h>
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#include <asm/io.h>
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#include <asm/irq.h>
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#include <asm/types.h>
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#include <asm/io.h>
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#include <linux/uaccess.h>
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#define DRIVER_NAME "goldfish_mmc"
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#define BUFFER_SIZE 16384
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#define GOLDFISH_MMC_READ(host, addr) (readl(host->reg_base + addr))
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#define GOLDFISH_MMC_WRITE(host, addr, x) (writel(x, host->reg_base + addr))
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enum {
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/* status register */
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MMC_INT_STATUS = 0x00,
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/* set this to enable IRQ */
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MMC_INT_ENABLE = 0x04,
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/* set this to specify buffer address */
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MMC_SET_BUFFER = 0x08,
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/* MMC command number */
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MMC_CMD = 0x0C,
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/* MMC argument */
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MMC_ARG = 0x10,
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/* MMC response (or R2 bits 0 - 31) */
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MMC_RESP_0 = 0x14,
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/* MMC R2 response bits 32 - 63 */
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MMC_RESP_1 = 0x18,
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/* MMC R2 response bits 64 - 95 */
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MMC_RESP_2 = 0x1C,
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/* MMC R2 response bits 96 - 127 */
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MMC_RESP_3 = 0x20,
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MMC_BLOCK_LENGTH = 0x24,
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MMC_BLOCK_COUNT = 0x28,
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/* MMC state flags */
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MMC_STATE = 0x2C,
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/* MMC_INT_STATUS bits */
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MMC_STAT_END_OF_CMD = 1U << 0,
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MMC_STAT_END_OF_DATA = 1U << 1,
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MMC_STAT_STATE_CHANGE = 1U << 2,
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MMC_STAT_CMD_TIMEOUT = 1U << 3,
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/* MMC_STATE bits */
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MMC_STATE_INSERTED = 1U << 0,
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MMC_STATE_READ_ONLY = 1U << 1,
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};
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/*
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* Command types
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*/
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#define OMAP_MMC_CMDTYPE_BC 0
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#define OMAP_MMC_CMDTYPE_BCR 1
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#define OMAP_MMC_CMDTYPE_AC 2
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#define OMAP_MMC_CMDTYPE_ADTC 3
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struct goldfish_mmc_host {
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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 mmc_host *mmc;
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struct device *dev;
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unsigned char id; /* 16xx chips have 2 MMC blocks */
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void *virt_base;
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unsigned int phys_base;
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int irq;
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unsigned char bus_mode;
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unsigned char hw_bus_mode;
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unsigned int sg_len;
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unsigned dma_done:1;
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unsigned dma_in_use:1;
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void __iomem *reg_base;
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};
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static inline int
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goldfish_mmc_cover_is_open(struct goldfish_mmc_host *host)
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{
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return 0;
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}
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static ssize_t
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goldfish_mmc_show_cover_switch(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct goldfish_mmc_host *host = dev_get_drvdata(dev);
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return sprintf(buf, "%s\n", goldfish_mmc_cover_is_open(host) ? "open" :
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"closed");
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}
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static DEVICE_ATTR(cover_switch, S_IRUGO, goldfish_mmc_show_cover_switch, NULL);
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static void
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goldfish_mmc_start_command(struct goldfish_mmc_host *host, struct mmc_command *cmd)
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{
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u32 cmdreg;
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u32 resptype;
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u32 cmdtype;
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host->cmd = cmd;
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resptype = 0;
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cmdtype = 0;
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/* Our hardware needs to know exact type */
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switch (mmc_resp_type(cmd)) {
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case MMC_RSP_NONE:
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break;
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case MMC_RSP_R1:
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case MMC_RSP_R1B:
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/* resp 1, 1b, 6, 7 */
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resptype = 1;
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break;
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case MMC_RSP_R2:
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resptype = 2;
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break;
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case MMC_RSP_R3:
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resptype = 3;
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break;
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default:
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dev_err(mmc_dev(host->mmc),
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"Invalid response type: %04x\n", mmc_resp_type(cmd));
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break;
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}
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if (mmc_cmd_type(cmd) == MMC_CMD_ADTC)
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cmdtype = OMAP_MMC_CMDTYPE_ADTC;
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else if (mmc_cmd_type(cmd) == MMC_CMD_BC)
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cmdtype = OMAP_MMC_CMDTYPE_BC;
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else if (mmc_cmd_type(cmd) == MMC_CMD_BCR)
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cmdtype = OMAP_MMC_CMDTYPE_BCR;
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else
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cmdtype = OMAP_MMC_CMDTYPE_AC;
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cmdreg = cmd->opcode | (resptype << 8) | (cmdtype << 12);
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if (host->bus_mode == MMC_BUSMODE_OPENDRAIN)
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cmdreg |= 1 << 6;
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if (cmd->flags & MMC_RSP_BUSY)
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cmdreg |= 1 << 11;
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if (host->data && !(host->data->flags & MMC_DATA_WRITE))
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cmdreg |= 1 << 15;
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GOLDFISH_MMC_WRITE(host, MMC_ARG, cmd->arg);
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GOLDFISH_MMC_WRITE(host, MMC_CMD, cmdreg);
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}
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static void goldfish_mmc_xfer_done(struct goldfish_mmc_host *host,
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struct mmc_data *data)
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{
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if (host->dma_in_use) {
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enum dma_data_direction dma_data_dir;
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dma_data_dir = mmc_get_dma_dir(data);
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if (dma_data_dir == DMA_FROM_DEVICE) {
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/*
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* We don't really have DMA, so we need
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* to copy from our platform driver buffer
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*/
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uint8_t *dest = (uint8_t *)sg_virt(data->sg);
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memcpy(dest, host->virt_base, data->sg->length);
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}
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host->data->bytes_xfered += data->sg->length;
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dma_unmap_sg(mmc_dev(host->mmc), data->sg, host->sg_len,
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dma_data_dir);
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}
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host->data = NULL;
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host->sg_len = 0;
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/*
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* NOTE: MMC layer will sometimes poll-wait CMD13 next, issuing
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* dozens of requests until the card finishes writing data.
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* It'd be cheaper to just wait till an EOFB interrupt arrives...
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*/
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if (!data->stop) {
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host->mrq = NULL;
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mmc_request_done(host->mmc, data->mrq);
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return;
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}
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goldfish_mmc_start_command(host, data->stop);
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}
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static void goldfish_mmc_end_of_data(struct goldfish_mmc_host *host,
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struct mmc_data *data)
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{
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if (!host->dma_in_use) {
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goldfish_mmc_xfer_done(host, data);
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return;
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}
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if (host->dma_done)
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goldfish_mmc_xfer_done(host, data);
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}
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static void goldfish_mmc_cmd_done(struct goldfish_mmc_host *host,
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struct mmc_command *cmd)
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{
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host->cmd = NULL;
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if (cmd->flags & MMC_RSP_PRESENT) {
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if (cmd->flags & MMC_RSP_136) {
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/* response type 2 */
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cmd->resp[3] =
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GOLDFISH_MMC_READ(host, MMC_RESP_0);
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cmd->resp[2] =
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GOLDFISH_MMC_READ(host, MMC_RESP_1);
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cmd->resp[1] =
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GOLDFISH_MMC_READ(host, MMC_RESP_2);
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cmd->resp[0] =
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GOLDFISH_MMC_READ(host, MMC_RESP_3);
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} else {
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/* response types 1, 1b, 3, 4, 5, 6 */
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cmd->resp[0] =
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GOLDFISH_MMC_READ(host, MMC_RESP_0);
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}
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}
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if (host->data == NULL || cmd->error) {
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host->mrq = NULL;
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mmc_request_done(host->mmc, cmd->mrq);
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}
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}
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static irqreturn_t goldfish_mmc_irq(int irq, void *dev_id)
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{
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struct goldfish_mmc_host *host = (struct goldfish_mmc_host *)dev_id;
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u16 status;
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int end_command = 0;
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int end_transfer = 0;
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int state_changed = 0;
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int cmd_timeout = 0;
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while ((status = GOLDFISH_MMC_READ(host, MMC_INT_STATUS)) != 0) {
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GOLDFISH_MMC_WRITE(host, MMC_INT_STATUS, status);
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if (status & MMC_STAT_END_OF_CMD)
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end_command = 1;
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if (status & MMC_STAT_END_OF_DATA)
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end_transfer = 1;
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if (status & MMC_STAT_STATE_CHANGE)
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state_changed = 1;
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if (status & MMC_STAT_CMD_TIMEOUT) {
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end_command = 0;
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cmd_timeout = 1;
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}
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}
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if (cmd_timeout) {
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struct mmc_request *mrq = host->mrq;
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mrq->cmd->error = -ETIMEDOUT;
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host->mrq = NULL;
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mmc_request_done(host->mmc, mrq);
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}
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if (end_command)
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goldfish_mmc_cmd_done(host, host->cmd);
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if (end_transfer) {
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host->dma_done = 1;
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goldfish_mmc_end_of_data(host, host->data);
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} else if (host->data != NULL) {
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/*
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* WORKAROUND -- after porting this driver from 2.6 to 3.4,
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* during device initialization, cases where host->data is
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* non-null but end_transfer is false would occur. Doing
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* nothing in such cases results in no further interrupts,
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* and initialization failure.
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* TODO -- find the real cause.
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*/
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host->dma_done = 1;
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goldfish_mmc_end_of_data(host, host->data);
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}
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if (state_changed) {
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u32 state = GOLDFISH_MMC_READ(host, MMC_STATE);
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pr_info("%s: Card detect now %d\n", __func__,
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(state & MMC_STATE_INSERTED));
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mmc_detect_change(host->mmc, 0);
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}
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if (!end_command && !end_transfer && !state_changed && !cmd_timeout) {
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status = GOLDFISH_MMC_READ(host, MMC_INT_STATUS);
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dev_info(mmc_dev(host->mmc),"spurious irq 0x%04x\n", status);
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if (status != 0) {
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GOLDFISH_MMC_WRITE(host, MMC_INT_STATUS, status);
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GOLDFISH_MMC_WRITE(host, MMC_INT_ENABLE, 0);
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}
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}
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return IRQ_HANDLED;
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}
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static void goldfish_mmc_prepare_data(struct goldfish_mmc_host *host,
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struct mmc_request *req)
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{
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struct mmc_data *data = req->data;
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int block_size;
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unsigned sg_len;
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enum dma_data_direction dma_data_dir;
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host->data = data;
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if (data == NULL) {
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GOLDFISH_MMC_WRITE(host, MMC_BLOCK_LENGTH, 0);
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GOLDFISH_MMC_WRITE(host, MMC_BLOCK_COUNT, 0);
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host->dma_in_use = 0;
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return;
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}
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block_size = data->blksz;
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GOLDFISH_MMC_WRITE(host, MMC_BLOCK_COUNT, data->blocks - 1);
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GOLDFISH_MMC_WRITE(host, MMC_BLOCK_LENGTH, block_size - 1);
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/*
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* Cope with calling layer confusion; it issues "single
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* block" writes using multi-block scatterlists.
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*/
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sg_len = (data->blocks == 1) ? 1 : data->sg_len;
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dma_data_dir = mmc_get_dma_dir(data);
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host->sg_len = dma_map_sg(mmc_dev(host->mmc), data->sg,
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sg_len, dma_data_dir);
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host->dma_done = 0;
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host->dma_in_use = 1;
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if (dma_data_dir == DMA_TO_DEVICE) {
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/*
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* We don't really have DMA, so we need to copy to our
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* platform driver buffer
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*/
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const uint8_t *src = (uint8_t *)sg_virt(data->sg);
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memcpy(host->virt_base, src, data->sg->length);
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}
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}
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static void goldfish_mmc_request(struct mmc_host *mmc, struct mmc_request *req)
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{
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struct goldfish_mmc_host *host = mmc_priv(mmc);
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WARN_ON(host->mrq != NULL);
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host->mrq = req;
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goldfish_mmc_prepare_data(host, req);
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goldfish_mmc_start_command(host, req->cmd);
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/*
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* This is to avoid accidentally being detected as an SDIO card
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* in mmc_attach_sdio().
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*/
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if (req->cmd->opcode == SD_IO_SEND_OP_COND &&
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req->cmd->flags == (MMC_RSP_SPI_R4 | MMC_RSP_R4 | MMC_CMD_BCR))
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req->cmd->error = -EINVAL;
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}
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static void goldfish_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
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{
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struct goldfish_mmc_host *host = mmc_priv(mmc);
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host->bus_mode = ios->bus_mode;
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host->hw_bus_mode = host->bus_mode;
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}
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static int goldfish_mmc_get_ro(struct mmc_host *mmc)
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{
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uint32_t state;
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struct goldfish_mmc_host *host = mmc_priv(mmc);
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state = GOLDFISH_MMC_READ(host, MMC_STATE);
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return ((state & MMC_STATE_READ_ONLY) != 0);
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}
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static const struct mmc_host_ops goldfish_mmc_ops = {
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.request = goldfish_mmc_request,
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.set_ios = goldfish_mmc_set_ios,
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.get_ro = goldfish_mmc_get_ro,
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};
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static int goldfish_mmc_probe(struct platform_device *pdev)
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{
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struct mmc_host *mmc;
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struct goldfish_mmc_host *host = NULL;
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struct resource *res;
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int ret = 0;
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int irq;
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dma_addr_t buf_addr;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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irq = platform_get_irq(pdev, 0);
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if (res == NULL || irq < 0)
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return -ENXIO;
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mmc = mmc_alloc_host(sizeof(struct goldfish_mmc_host), &pdev->dev);
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if (mmc == NULL) {
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ret = -ENOMEM;
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goto err_alloc_host_failed;
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}
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host = mmc_priv(mmc);
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host->mmc = mmc;
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pr_err("mmc: Mapping %lX to %lX\n", (long)res->start, (long)res->end);
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host->reg_base = ioremap(res->start, resource_size(res));
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if (host->reg_base == NULL) {
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ret = -ENOMEM;
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goto ioremap_failed;
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}
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host->virt_base = dma_alloc_coherent(&pdev->dev, BUFFER_SIZE,
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&buf_addr, GFP_KERNEL);
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if (host->virt_base == 0) {
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ret = -ENOMEM;
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goto dma_alloc_failed;
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}
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host->phys_base = buf_addr;
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host->id = pdev->id;
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host->irq = irq;
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mmc->ops = &goldfish_mmc_ops;
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mmc->f_min = 400000;
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mmc->f_max = 24000000;
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mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
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mmc->caps = MMC_CAP_4_BIT_DATA;
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/* Use scatterlist DMA to reduce per-transfer costs.
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* NOTE max_seg_size assumption that small blocks aren't
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* normally used (except e.g. for reading SD registers).
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*/
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mmc->max_segs = 32;
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mmc->max_blk_size = 2048; /* MMC_BLOCK_LENGTH is 11 bits (+1) */
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mmc->max_blk_count = 2048; /* MMC_BLOCK_COUNT is 11 bits (+1) */
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mmc->max_req_size = BUFFER_SIZE;
|
|
mmc->max_seg_size = mmc->max_req_size;
|
|
|
|
ret = request_irq(host->irq, goldfish_mmc_irq, 0, DRIVER_NAME, host);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "Failed IRQ Adding goldfish MMC\n");
|
|
goto err_request_irq_failed;
|
|
}
|
|
|
|
host->dev = &pdev->dev;
|
|
platform_set_drvdata(pdev, host);
|
|
|
|
ret = device_create_file(&pdev->dev, &dev_attr_cover_switch);
|
|
if (ret)
|
|
dev_warn(mmc_dev(host->mmc),
|
|
"Unable to create sysfs attributes\n");
|
|
|
|
GOLDFISH_MMC_WRITE(host, MMC_SET_BUFFER, host->phys_base);
|
|
GOLDFISH_MMC_WRITE(host, MMC_INT_ENABLE,
|
|
MMC_STAT_END_OF_CMD | MMC_STAT_END_OF_DATA |
|
|
MMC_STAT_STATE_CHANGE | MMC_STAT_CMD_TIMEOUT);
|
|
|
|
mmc_add_host(mmc);
|
|
return 0;
|
|
|
|
err_request_irq_failed:
|
|
dma_free_coherent(&pdev->dev, BUFFER_SIZE, host->virt_base,
|
|
host->phys_base);
|
|
dma_alloc_failed:
|
|
iounmap(host->reg_base);
|
|
ioremap_failed:
|
|
mmc_free_host(host->mmc);
|
|
err_alloc_host_failed:
|
|
return ret;
|
|
}
|
|
|
|
static int goldfish_mmc_remove(struct platform_device *pdev)
|
|
{
|
|
struct goldfish_mmc_host *host = platform_get_drvdata(pdev);
|
|
|
|
BUG_ON(host == NULL);
|
|
|
|
mmc_remove_host(host->mmc);
|
|
free_irq(host->irq, host);
|
|
dma_free_coherent(&pdev->dev, BUFFER_SIZE, host->virt_base, host->phys_base);
|
|
iounmap(host->reg_base);
|
|
mmc_free_host(host->mmc);
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver goldfish_mmc_driver = {
|
|
.probe = goldfish_mmc_probe,
|
|
.remove = goldfish_mmc_remove,
|
|
.driver = {
|
|
.name = DRIVER_NAME,
|
|
},
|
|
};
|
|
|
|
module_platform_driver(goldfish_mmc_driver);
|
|
MODULE_LICENSE("GPL v2");
|