/*
* Copyright (C) 2013-2014 Renesas Electronics Europe Ltd.
* Author: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*/
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/dmaengine.h>
#include <linux/highmem.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/log2.h>
#include <linux/mmc/host.h>
#include <linux/mmc/mmc.h>
#include <linux/mmc/sd.h>
#include <linux/mmc/sdio.h>
#include <linux/module.h>
#include <linux/pagemap.h>
#include <linux/platform_device.h>
#include <linux/scatterlist.h>
#include <linux/string.h>
#include <linux/time.h>
#include <linux/virtio.h>
#include <linux/workqueue.h>
#define USDHI6_SD_CMD 0x0000
#define USDHI6_SD_PORT_SEL 0x0004
#define USDHI6_SD_ARG 0x0008
#define USDHI6_SD_STOP 0x0010
#define USDHI6_SD_SECCNT 0x0014
#define USDHI6_SD_RSP10 0x0018
#define USDHI6_SD_RSP32 0x0020
#define USDHI6_SD_RSP54 0x0028
#define USDHI6_SD_RSP76 0x0030
#define USDHI6_SD_INFO1 0x0038
#define USDHI6_SD_INFO2 0x003c
#define USDHI6_SD_INFO1_MASK 0x0040
#define USDHI6_SD_INFO2_MASK 0x0044
#define USDHI6_SD_CLK_CTRL 0x0048
#define USDHI6_SD_SIZE 0x004c
#define USDHI6_SD_OPTION 0x0050
#define USDHI6_SD_ERR_STS1 0x0058
#define USDHI6_SD_ERR_STS2 0x005c
#define USDHI6_SD_BUF0 0x0060
#define USDHI6_SDIO_MODE 0x0068
#define USDHI6_SDIO_INFO1 0x006c
#define USDHI6_SDIO_INFO1_MASK 0x0070
#define USDHI6_CC_EXT_MODE 0x01b0
#define USDHI6_SOFT_RST 0x01c0
#define USDHI6_VERSION 0x01c4
#define USDHI6_HOST_MODE 0x01c8
#define USDHI6_SDIF_MODE 0x01cc
#define USDHI6_SD_CMD_APP 0x0040
#define USDHI6_SD_CMD_MODE_RSP_AUTO 0x0000
#define USDHI6_SD_CMD_MODE_RSP_NONE 0x0300
#define USDHI6_SD_CMD_MODE_RSP_R1 0x0400 /* Also R5, R6, R7 */
#define USDHI6_SD_CMD_MODE_RSP_R1B 0x0500 /* R1b */
#define USDHI6_SD_CMD_MODE_RSP_R2 0x0600
#define USDHI6_SD_CMD_MODE_RSP_R3 0x0700 /* Also R4 */
#define USDHI6_SD_CMD_DATA 0x0800
#define USDHI6_SD_CMD_READ 0x1000
#define USDHI6_SD_CMD_MULTI 0x2000
#define USDHI6_SD_CMD_CMD12_AUTO_OFF 0x4000
#define USDHI6_CC_EXT_MODE_SDRW BIT(1)
#define USDHI6_SD_INFO1_RSP_END BIT(0)
#define USDHI6_SD_INFO1_ACCESS_END BIT(2)
#define USDHI6_SD_INFO1_CARD_OUT BIT(3)
#define USDHI6_SD_INFO1_CARD_IN BIT(4)
#define USDHI6_SD_INFO1_CD BIT(5)
#define USDHI6_SD_INFO1_WP BIT(7)
#define USDHI6_SD_INFO1_D3_CARD_OUT BIT(8)
#define USDHI6_SD_INFO1_D3_CARD_IN BIT(9)
#define USDHI6_SD_INFO2_CMD_ERR BIT(0)
#define USDHI6_SD_INFO2_CRC_ERR BIT(1)
#define USDHI6_SD_INFO2_END_ERR BIT(2)
#define USDHI6_SD_INFO2_TOUT BIT(3)
#define USDHI6_SD_INFO2_IWA_ERR BIT(4)
#define USDHI6_SD_INFO2_IRA_ERR BIT(5)
#define USDHI6_SD_INFO2_RSP_TOUT BIT(6)
#define USDHI6_SD_INFO2_SDDAT0 BIT(7)
#define USDHI6_SD_INFO2_BRE BIT(8)
#define USDHI6_SD_INFO2_BWE BIT(9)
#define USDHI6_SD_INFO2_SCLKDIVEN BIT(13)
#define USDHI6_SD_INFO2_CBSY BIT(14)
#define USDHI6_SD_INFO2_ILA BIT(15)
#define USDHI6_SD_INFO1_CARD_INSERT (USDHI6_SD_INFO1_CARD_IN | USDHI6_SD_INFO1_D3_CARD_IN)
#define USDHI6_SD_INFO1_CARD_EJECT (USDHI6_SD_INFO1_CARD_OUT | USDHI6_SD_INFO1_D3_CARD_OUT)
#define USDHI6_SD_INFO1_CARD (USDHI6_SD_INFO1_CARD_INSERT | USDHI6_SD_INFO1_CARD_EJECT)
#define USDHI6_SD_INFO1_CARD_CD (USDHI6_SD_INFO1_CARD_IN | USDHI6_SD_INFO1_CARD_OUT)
#define USDHI6_SD_INFO2_ERR (USDHI6_SD_INFO2_CMD_ERR | \
USDHI6_SD_INFO2_CRC_ERR | USDHI6_SD_INFO2_END_ERR | \
USDHI6_SD_INFO2_TOUT | USDHI6_SD_INFO2_IWA_ERR | \
USDHI6_SD_INFO2_IRA_ERR | USDHI6_SD_INFO2_RSP_TOUT | \
USDHI6_SD_INFO2_ILA)
#define USDHI6_SD_INFO1_IRQ (USDHI6_SD_INFO1_RSP_END | USDHI6_SD_INFO1_ACCESS_END | \
USDHI6_SD_INFO1_CARD)
#define USDHI6_SD_INFO2_IRQ (USDHI6_SD_INFO2_ERR | USDHI6_SD_INFO2_BRE | \
USDHI6_SD_INFO2_BWE | 0x0800 | USDHI6_SD_INFO2_ILA)
#define USDHI6_SD_CLK_CTRL_SCLKEN BIT(8)
#define USDHI6_SD_STOP_STP BIT(0)
#define USDHI6_SD_STOP_SEC BIT(8)
#define USDHI6_SDIO_INFO1_IOIRQ BIT(0)
#define USDHI6_SDIO_INFO1_EXPUB52 BIT(14)
#define USDHI6_SDIO_INFO1_EXWT BIT(15)
#define USDHI6_SD_ERR_STS1_CRC_NO_ERROR BIT(13)
#define USDHI6_SOFT_RST_RESERVED (BIT(1) | BIT(2))
#define USDHI6_SOFT_RST_RESET BIT(0)
#define USDHI6_SD_OPTION_TIMEOUT_SHIFT 4
#define USDHI6_SD_OPTION_TIMEOUT_MASK (0xf << USDHI6_SD_OPTION_TIMEOUT_SHIFT)
#define USDHI6_SD_OPTION_WIDTH_1 BIT(15)
#define USDHI6_SD_PORT_SEL_PORTS_SHIFT 8
#define USDHI6_SD_CLK_CTRL_DIV_MASK 0xff
#define USDHI6_SDIO_INFO1_IRQ (USDHI6_SDIO_INFO1_IOIRQ | 3 | \
USDHI6_SDIO_INFO1_EXPUB52 | USDHI6_SDIO_INFO1_EXWT)
#define USDHI6_MIN_DMA 64
enum usdhi6_wait_for {
USDHI6_WAIT_FOR_REQUEST,
USDHI6_WAIT_FOR_CMD,
USDHI6_WAIT_FOR_MREAD,
USDHI6_WAIT_FOR_MWRITE,
USDHI6_WAIT_FOR_READ,
USDHI6_WAIT_FOR_WRITE,
USDHI6_WAIT_FOR_DATA_END,
USDHI6_WAIT_FOR_STOP,
USDHI6_WAIT_FOR_DMA,
};
struct usdhi6_page {
struct page *page;
void *mapped; /* mapped page */
};
struct usdhi6_host {
struct mmc_host *mmc;
struct mmc_request *mrq;
void __iomem *base;
struct clk *clk;
/* SG memory handling */
/* Common for multiple and single block requests */
struct usdhi6_page pg; /* current page from an SG */
void *blk_page; /* either a mapped page, or the bounce buffer */
size_t offset; /* offset within a page, including sg->offset */
/* Blocks, crossing a page boundary */
size_t head_len;
struct usdhi6_page head_pg;
/* A bounce buffer for unaligned blocks or blocks, crossing a page boundary */
struct scatterlist bounce_sg;
u8 bounce_buf[512];
/* Multiple block requests only */
struct scatterlist *sg; /* current SG segment */
int page_idx; /* page index within an SG segment */
enum usdhi6_wait_for wait;
u32 status_mask;
u32 status2_mask;
u32 sdio_mask;
u32 io_error;
u32 irq_status;
unsigned long imclk;
unsigned long rate;
bool app_cmd;
/* Timeout handling */
struct delayed_work timeout_work;
unsigned long timeout;
/* DMA support */
struct dma_chan *chan_rx;
struct dma_chan *chan_tx;
bool dma_active;
};
/* I/O primitives */
static void usdhi6_write(struct usdhi6_host *host, u32 reg, u32 data)
{
iowrite32(data, host->base + reg);
dev_vdbg(mmc_dev(host->mmc), "%s(0x%p + 0x%x) = 0x%x\n", __func__,
host->base, reg, data);
}
static void usdhi6_write16(struct usdhi6_host *host, u32 reg, u16 data)
{
iowrite16(data, host->base + reg);
dev_vdbg(mmc_dev(host->mmc), "%s(0x%p + 0x%x) = 0x%x\n", __func__,
host->base, reg, data);
}
static u32 usdhi6_read(struct usdhi6_host *host, u32 reg)
{
u32 data = ioread32(host->base + reg);
dev_vdbg(mmc_dev(host->mmc), "%s(0x%p + 0x%x) = 0x%x\n", __func__,
host->base, reg, data);
return data;
}
static u16 usdhi6_read16(struct usdhi6_host *host, u32 reg)
{
u16 data = ioread16(host->base + reg);
dev_vdbg(mmc_dev(host->mmc), "%s(0x%p + 0x%x) = 0x%x\n", __func__,
host->base, reg, data);
return data;
}
static void usdhi6_irq_enable(struct usdhi6_host *host, u32 info1, u32 info2)
{
host->status_mask = USDHI6_SD_INFO1_IRQ & ~info1;
host->status2_mask = USDHI6_SD_INFO2_IRQ & ~info2;
usdhi6_write(host, USDHI6_SD_INFO1_MASK, host->status_mask);
usdhi6_write(host, USDHI6_SD_INFO2_MASK, host->status2_mask);
}
static void usdhi6_wait_for_resp(struct usdhi6_host *host)
{
usdhi6_irq_enable(host, USDHI6_SD_INFO1_RSP_END |
USDHI6_SD_INFO1_ACCESS_END | USDHI6_SD_INFO1_CARD_CD,
USDHI6_SD_INFO2_ERR);
}
static void usdhi6_wait_for_brwe(struct usdhi6_host *host, bool read)
{
usdhi6_irq_enable(host, USDHI6_SD_INFO1_ACCESS_END |
USDHI6_SD_INFO1_CARD_CD, USDHI6_SD_INFO2_ERR |
(read ? USDHI6_SD_INFO2_BRE : USDHI6_SD_INFO2_BWE));
}
static void usdhi6_only_cd(struct usdhi6_host *host)
{
/* Mask all except card hotplug */
usdhi6_irq_enable(host, USDHI6_SD_INFO1_CARD_CD, 0);
}
static void usdhi6_mask_all(struct usdhi6_host *host)
{
usdhi6_irq_enable(host, 0, 0);
}
static int usdhi6_error_code(struct usdhi6_host *host)
{
u32 err;
usdhi6_write(host, USDHI6_SD_STOP, USDHI6_SD_STOP_STP);
if (host->io_error &
(USDHI6_SD_INFO2_RSP_TOUT | USDHI6_SD_INFO2_TOUT)) {
u32 rsp54 = usdhi6_read(host, USDHI6_SD_RSP54);
int opc = host->mrq ? host->mrq->cmd->opcode : -1;
err = usdhi6_read(host, USDHI6_SD_ERR_STS2);
/* Response timeout is often normal, don't spam the log */
if (host->wait == USDHI6_WAIT_FOR_CMD)
dev_dbg(mmc_dev(host->mmc),
"T-out sts 0x%x, resp 0x%x, state %u, CMD%d\n",
err, rsp54, host->wait, opc);
else
dev_warn(mmc_dev(host->mmc),
"T-out sts 0x%x, resp 0x%x, state %u, CMD%d\n",
err, rsp54, host->wait, opc);
return -ETIMEDOUT;
}
err = usdhi6_read(host, USDHI6_SD_ERR_STS1);
if (err != USDHI6_SD_ERR_STS1_CRC_NO_ERROR)
dev_warn(mmc_dev(host->mmc), "Err sts 0x%x, state %u, CMD%d\n",
err, host->wait, host->mrq ? host->mrq->cmd->opcode : -1);
if (host->io_error & USDHI6_SD_INFO2_ILA)
return -EILSEQ;
return -EIO;
}
/* Scatter-Gather management */
/*
* In PIO mode we have to map each page separately, using kmap(). That way
* adjacent pages are mapped to non-adjacent virtual addresses. That's why we
* have to use a bounce buffer for blocks, crossing page boundaries. Such blocks
* have been observed with an SDIO WiFi card (b43 driver).
*/
static void usdhi6_blk_bounce(struct usdhi6_host *host,
struct scatterlist *sg)
{
struct mmc_data *data = host->mrq->data;
size_t blk_head = host->head_len;
dev_dbg(mmc_dev(host->mmc), "%s(): CMD%u of %u SG: %ux%u @ 0x%x\n",
__func__, host->mrq->cmd->opcode, data->sg_len,
data->blksz, data->blocks, sg->offset);
host->head_pg.page = host->pg.page;
host->head_pg.mapped = host->pg.mapped;
host->pg.page = nth_page(host->pg.page, 1);
host->pg.mapped = kmap(host->pg.page);
host->blk_page = host->bounce_buf;
host->offset = 0;
if (data->flags & MMC_DATA_READ)
return;
memcpy(host->bounce_buf, host->head_pg.mapped + PAGE_SIZE - blk_head,
blk_head);
memcpy(host->bounce_buf + blk_head, host->pg.mapped,
data->blksz - blk_head);
}
/* Only called for multiple block IO */
static void usdhi6_sg_prep(struct usdhi6_host *host)
{
struct mmc_request *mrq = host->mrq;
struct mmc_data *data = mrq->data;
usdhi6_write(host, USDHI6_SD_SECCNT, data->blocks);
host->sg = data->sg;
/* TODO: if we always map, this is redundant */
host->offset = host->sg->offset;
}
/* Map the first page in an SG segment: common for multiple and single block IO */
static void *usdhi6_sg_map(struct usdhi6_host *host)
{
struct mmc_data *data = host->mrq->data;
struct scatterlist *sg = data->sg_len > 1 ? host->sg : data->sg;
size_t head = PAGE_SIZE - sg->offset;
size_t blk_head = head % data->blksz;
WARN(host->pg.page, "%p not properly unmapped!\n", host->pg.page);
if (WARN(sg_dma_len(sg) % data->blksz,
"SG size %u isn't a multiple of block size %u\n",
sg_dma_len(sg), data->blksz))
return NULL;
host->pg.page = sg_page(sg);
host->pg.mapped = kmap(host->pg.page);
host->offset = sg->offset;
/*
* Block size must be a power of 2 for multi-block transfers,
* therefore blk_head is equal for all pages in this SG
*/
host->head_len = blk_head;
if (head < data->blksz)
/*
* The first block in the SG crosses a page boundary.
* Max blksz = 512, so blocks can only span 2 pages
*/
usdhi6_blk_bounce(host, sg);
else
host->blk_page = host->pg.mapped;
dev_dbg(mmc_dev(host->mmc), "Mapped %p (%lx) at %p + %u for CMD%u @ 0x%p\n",
host->pg.page, page_to_pfn(host->pg.page), host->pg.mapped,
sg->offset, host->mrq->cmd->opcode, host->mrq);
return host->blk_page + host->offset;
}
/* Unmap the current page: common for multiple and single block IO */
static void usdhi6_sg_unmap(struct usdhi6_host *host, bool force)
{
struct mmc_data *data = host->mrq->data;
struct page *page = host->head_pg.page;
if (page) {
/* Previous block was cross-page boundary */
struct scatterlist *sg = data->sg_len > 1 ?
host->sg : data->sg;
size_t blk_head = host->head_len;
if (!data->error && data->flags & MMC_DATA_READ) {
memcpy(host->head_pg.mapped + PAGE_SIZE - blk_head,
host->bounce_buf, blk_head);
memcpy(host->pg.mapped, host->bounce_buf + blk_head,
data->blksz - blk_head);
}
flush_dcache_page(page);
kunmap(page);
host->head_pg.page = NULL;
if (!force && sg_dma_len(sg) + sg->offset >
(host->page_idx << PAGE_SHIFT) + data->blksz - blk_head)
/* More blocks in this SG, don't unmap the next page */
return;
}
page = host->pg.page;
if (!page)
return;
flush_dcache_page(page);
kunmap(page);
host->pg.page = NULL;
}
/* Called from MMC_WRITE_MULTIPLE_BLOCK or MMC_READ_MULTIPLE_BLOCK */
static void usdhi6_sg_advance(struct usdhi6_host *host)
{
struct mmc_data *data = host->mrq->data;
size_t done, total;
/* New offset: set at the end of the previous block */
if (host->head_pg.page) {
/* Finished a cross-page block, jump to the new page */
host->page_idx++;
host->offset = data->blksz - host->head_len;
host->blk_page = host->pg.mapped;
usdhi6_sg_unmap(host, false);
} else {
host->offset += data->blksz;
/* The completed block didn't cross a page boundary */
if (host->offset == PAGE_SIZE) {
/* If required, we'll map the page below */
host->offset = 0;
host->page_idx++;
}
}
/*
* Now host->blk_page + host->offset point at the end of our last block
* and host->page_idx is the index of the page, in which our new block
* is located, if any
*/
done = (host->page_idx << PAGE_SHIFT) + host->offset;
total = host->sg->offset + sg_dma_len(host->sg);
dev_dbg(mmc_dev(host->mmc), "%s(): %zu of %zu @ %zu\n", __func__,
done, total, host->offset);
if (done < total && host->offset) {
/* More blocks in this page */
if (host->offset + data->blksz > PAGE_SIZE)
/* We approached at a block, that spans 2 pages */
usdhi6_blk_bounce(host, host->sg);
return;
}
/* Finished current page or an SG segment */
usdhi6_sg_unmap(host, false);
if (done == total) {
/*
* End of an SG segment or the complete SG: jump to the next
* segment, we'll map it later in usdhi6_blk_read() or
* usdhi6_blk_write()
*/
struct scatterlist *next = sg_next(host->sg);
host->page_idx = 0;
if (!next)
host->wait = USDHI6_WAIT_FOR_DATA_END;
host->sg = next;
if (WARN(next && sg_dma_len(next) % data->blksz,
"SG size %u isn't a multiple of block size %u\n",
sg_dma_len(next), data->blksz))
data->error = -EINVAL;
return;
}
/* We cannot get here after crossing a page border */
/* Next page in the same SG */
host->pg.page = nth_page(sg_page(host->sg), host->page_idx);
host->pg.mapped = kmap(host->pg.page);
host->blk_page = host->pg.mapped;
dev_dbg(mmc_dev(host->mmc), "Mapped %p (%lx) at %p for CMD%u @ 0x%p\n",
host->pg.page, page_to_pfn(host->pg.page), host->pg.mapped,
host->mrq->cmd->opcode, host->mrq);
}
/* DMA handling */
static void usdhi6_dma_release(struct usdhi6_host *host)
{
host->dma_active = false;
if (host->chan_tx) {
struct dma_chan *chan = host->chan_tx;
host->chan_tx = NULL;
dma_release_channel(chan);
}
if (host->chan_rx) {
struct dma_chan *chan = host->chan_rx;
host->chan_rx = NULL;
dma_release_channel(chan);
}
}
static void usdhi6_dma_stop_unmap(struct usdhi6_host *host)
{
struct mmc_data *data = host->mrq->data;
if (!host->dma_active)
return;
usdhi6_write(host, USDHI6_CC_EXT_MODE, 0);
host->dma_active = false;
if (data->flags & MMC_DATA_READ)
dma_unmap_sg(host->chan_rx->device->dev, data->sg,
data->sg_len, DMA_FROM_DEVICE);
else
dma_unmap_sg(host->chan_tx->device->dev, data->sg,
data->sg_len, DMA_TO_DEVICE);
}
static void usdhi6_dma_complete(void *arg)
{
struct usdhi6_host *host = arg;
struct mmc_request *mrq = host->mrq;
if (WARN(!mrq || !mrq->data, "%s: NULL data in DMA completion for %p!\n",
dev_name(mmc_dev(host->mmc)), mrq))
return;
dev_dbg(mmc_dev(host->mmc), "%s(): CMD%u DMA completed\n", __func__,
mrq->cmd->opcode);
usdhi6_dma_stop_unmap(host);
usdhi6_wait_for_brwe(host, mrq->data->flags & MMC_DATA_READ);
}
static int usdhi6_dma_setup(struct usdhi6_host *host, struct dma_chan *chan,
enum dma_transfer_direction dir)
{
struct mmc_data *data = host->mrq->data;
struct scatterlist *sg = data->sg;
struct dma_async_tx_descriptor *desc = NULL;
dma_cookie_t cookie = -EINVAL;
enum dma_data_direction data_dir;
int ret;
switch (dir) {
case DMA_MEM_TO_DEV:
data_dir = DMA_TO_DEVICE;
break;
case DMA_DEV_TO_MEM:
data_dir = DMA_FROM_DEVICE;
break;
default:
return -EINVAL;
}
ret = dma_map_sg(chan->device->dev, sg, data->sg_len, data_dir);
if (ret > 0) {
host->dma_active = true;
desc = dmaengine_prep_slave_sg(chan, sg, ret, dir,
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
}
if (desc) {
desc->callback = usdhi6_dma_complete;
desc->callback_param = host;
cookie = dmaengine_submit(desc);
}
dev_dbg(mmc_dev(host->mmc), "%s(): mapped %d -> %d, cookie %d @ %p\n",
__func__, data->sg_len, ret, cookie, desc);
if (cookie < 0) {
/* DMA failed, fall back to PIO */
if (ret >= 0)
ret = cookie;
usdhi6_dma_release(host);
dev_warn(mmc_dev(host->mmc),
"DMA failed: %d, falling back to PIO\n", ret);
}
return cookie;
}
static int usdhi6_dma_start(struct usdhi6_host *host)
{
if (!host->chan_rx || !host->chan_tx)
return -ENODEV;
if (host->mrq->data->flags & MMC_DATA_READ)
return usdhi6_dma_setup(host, host->chan_rx, DMA_DEV_TO_MEM);
return usdhi6_dma_setup(host, host->chan_tx, DMA_MEM_TO_DEV);
}
static void usdhi6_dma_kill(struct usdhi6_host *host)
{
struct mmc_data *data = host->mrq->data;
dev_dbg(mmc_dev(host->mmc), "%s(): SG of %u: %ux%u\n",
__func__, data->sg_len, data->blocks, data->blksz);
/* Abort DMA */
if (data->flags & MMC_DATA_READ)
dmaengine_terminate_all(host->chan_rx);
else
dmaengine_terminate_all(host->chan_tx);
}
static void usdhi6_dma_check_error(struct usdhi6_host *host)
{
struct mmc_data *data = host->mrq->data;
dev_dbg(mmc_dev(host->mmc), "%s(): IO error %d, status 0x%x\n",
__func__, host->io_error, usdhi6_read(host, USDHI6_SD_INFO1));
if (host->io_error) {
data->error = usdhi6_error_code(host);
data->bytes_xfered = 0;
usdhi6_dma_kill(host);
usdhi6_dma_release(host);
dev_warn(mmc_dev(host->mmc),
"DMA failed: %d, falling back to PIO\n", data->error);
return;
}
/*
* The datasheet tells us to check a response from the card, whereas
* responses only come after the command phase, not after the data
* phase. Let's check anyway.
*/
if (host->irq_status & USDHI6_SD_INFO1_RSP_END)
dev_warn(mmc_dev(host->mmc), "Unexpected response received!\n");
}
static void usdhi6_dma_kick(struct usdhi6_host *host)
{
if (host->mrq->data->flags & MMC_DATA_READ)
dma_async_issue_pending(host->chan_rx);
else
dma_async_issue_pending(host->chan_tx);
}
static void usdhi6_dma_request(struct usdhi6_host *host, phys_addr_t start)
{
struct dma_slave_config cfg = {
.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
};
int ret;
host->chan_tx = dma_request_slave_channel(mmc_dev(host->mmc), "tx");
dev_dbg(mmc_dev(host->mmc), "%s: TX: got channel %p\n", __func__,
host->chan_tx);
if (!host->chan_tx)
return;
cfg.direction = DMA_MEM_TO_DEV;
cfg.dst_addr = start + USDHI6_SD_BUF0;
cfg.dst_maxburst = 128; /* 128 words * 4 bytes = 512 bytes */
cfg.src_addr = 0;
ret = dmaengine_slave_config(host->chan_tx, &cfg);
if (ret < 0)
goto e_release_tx;
host->chan_rx = dma_request_slave_channel(mmc_dev(host->mmc), "rx");
dev_dbg(mmc_dev(host->mmc), "%s: RX: got channel %p\n", __func__,
host->chan_rx);
if (!host->chan_rx)
goto e_release_tx;
cfg.direction = DMA_DEV_TO_MEM;
cfg.src_addr = cfg.dst_addr;
cfg.src_maxburst = 128; /* 128 words * 4 bytes = 512 bytes */
cfg.dst_addr = 0;
ret = dmaengine_slave_config(host->chan_rx, &cfg);
if (ret < 0)
goto e_release_rx;
return;
e_release_rx:
dma_release_channel(host->chan_rx);
host->chan_rx = NULL;
e_release_tx:
dma_release_channel(host->chan_tx);
host->chan_tx = NULL;
}
/* API helpers */
static void usdhi6_clk_set(struct usdhi6_host *host, struct mmc_ios *ios)
{
unsigned long rate = ios->clock;
u32 val;
unsigned int i;
for (i = 1000; i; i--) {
if (usdhi6_read(host, USDHI6_SD_INFO2) & USDHI6_SD_INFO2_SCLKDIVEN)
break;
usleep_range(10, 100);
}
if (!i) {
dev_err(mmc_dev(host->mmc), "SD bus busy, clock set aborted\n");
return;
}
val = usdhi6_read(host, USDHI6_SD_CLK_CTRL) & ~USDHI6_SD_CLK_CTRL_DIV_MASK;
if (rate) {
unsigned long new_rate;
if (host->imclk <= rate) {
if (ios->timing != MMC_TIMING_UHS_DDR50) {
/* Cannot have 1-to-1 clock in DDR mode */
new_rate = host->imclk;
val |= 0xff;
} else {
new_rate = host->imclk / 2;
}
} else {
unsigned long div =
roundup_pow_of_two(DIV_ROUND_UP(host->imclk, rate));
val |= div >> 2;
new_rate = host->imclk / div;
}
if (host->rate == new_rate)
return;
host->rate = new_rate;
dev_dbg(mmc_dev(host->mmc), "target %lu, div %u, set %lu\n",
rate, (val & 0xff) << 2, new_rate);
}
/*
* if old or new rate is equal to input rate, have to switch the clock
* off before changing and on after
*/
if (host->imclk == rate || host->imclk == host->rate || !rate)
usdhi6_write(host, USDHI6_SD_CLK_CTRL,
val & ~USDHI6_SD_CLK_CTRL_SCLKEN);
if (!rate) {
host->rate = 0;
return;
}
usdhi6_write(host, USDHI6_SD_CLK_CTRL, val);
if (host->imclk == rate || host->imclk == host->rate ||
!(val & USDHI6_SD_CLK_CTRL_SCLKEN))
usdhi6_write(host, USDHI6_SD_CLK_CTRL,
val | USDHI6_SD_CLK_CTRL_SCLKEN);
}
static void usdhi6_set_power(struct usdhi6_host *host, struct mmc_ios *ios)
{
struct mmc_host *mmc = host->mmc;
if (!IS_ERR(mmc->supply.vmmc))
/* Errors ignored... */
mmc_regulator_set_ocr(mmc, mmc->supply.vmmc,
ios->power_mode ? ios->vdd : 0);
}
static int usdhi6_reset(struct usdhi6_host *host)
{
int i;
usdhi6_write(host, USDHI6_SOFT_RST, USDHI6_SOFT_RST_RESERVED);
cpu_relax();
usdhi6_write(host, USDHI6_SOFT_RST, USDHI6_SOFT_RST_RESERVED | USDHI6_SOFT_RST_RESET);
for (i = 1000; i; i--)
if (usdhi6_read(host, USDHI6_SOFT_RST) & USDHI6_SOFT_RST_RESET)
break;
return i ? 0 : -ETIMEDOUT;
}
static void usdhi6_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
{
struct usdhi6_host *host = mmc_priv(mmc);
u32 option, mode;
int ret;
dev_dbg(mmc_dev(mmc), "%uHz, OCR: %u, power %u, bus-width %u, timing %u\n",
ios->clock, ios->vdd, ios->power_mode, ios->bus_width, ios->timing);
switch (ios->power_mode) {
case MMC_POWER_OFF:
usdhi6_set_power(host, ios);
usdhi6_only_cd(host);
break;
case MMC_POWER_UP:
/*
* We only also touch USDHI6_SD_OPTION from .request(), which
* cannot race with MMC_POWER_UP
*/
ret = usdhi6_reset(host);
if (ret < 0) {
dev_err(mmc_dev(mmc), "Cannot reset the interface!\n");
} else {
usdhi6_set_power(host, ios);
usdhi6_only_cd(host);
}
break;
case MMC_POWER_ON:
option = usdhi6_read(host, USDHI6_SD_OPTION);
/*
* The eMMC standard only allows 4 or 8 bits in the DDR mode,
* the same probably holds for SD cards. We check here anyway,
* since the datasheet explicitly requires 4 bits for DDR.
*/
if (ios->bus_width == MMC_BUS_WIDTH_1) {
if (ios->timing == MMC_TIMING_UHS_DDR50)
dev_err(mmc_dev(mmc),
"4 bits are required for DDR\n");
option |= USDHI6_SD_OPTION_WIDTH_1;
mode = 0;
} else {
option &= ~USDHI6_SD_OPTION_WIDTH_1;
mode = ios->timing == MMC_TIMING_UHS_DDR50;
}
usdhi6_write(host, USDHI6_SD_OPTION, option);
usdhi6_write(host, USDHI6_SDIF_MODE, mode);
break;
}
if (host->rate != ios->clock)
usdhi6_clk_set(host, ios);
}
/* This is data timeout. Response timeout is fixed to 640 clock cycles */
static void usdhi6_timeout_set(struct usdhi6_host *host)
{
struct mmc_request *mrq = host->mrq;
u32 val;
unsigned long ticks;
if (!mrq->data)
ticks = host->rate / 1000 * mrq->cmd->busy_timeout;
else
ticks = host->rate / 1000000 * (mrq->data->timeout_ns / 1000) +
mrq->data->timeout_clks;
if (!ticks || ticks > 1 << 27)
/* Max timeout */
val = 14;
else if (ticks < 1 << 13)
/* Min timeout */
val = 0;
else
val = order_base_2(ticks) - 13;
dev_dbg(mmc_dev(host->mmc), "Set %s timeout %lu ticks @ %lu Hz\n",
mrq->data ? "data" : "cmd", ticks, host->rate);
/* Timeout Counter mask: 0xf0 */
usdhi6_write(host, USDHI6_SD_OPTION, (val << USDHI6_SD_OPTION_TIMEOUT_SHIFT) |
(usdhi6_read(host, USDHI6_SD_OPTION) & ~USDHI6_SD_OPTION_TIMEOUT_MASK));
}
static void usdhi6_request_done(struct usdhi6_host *host)
{
struct mmc_request *mrq = host->mrq;
struct mmc_data *data = mrq->data;
if (WARN(host->pg.page || host->head_pg.page,
"Page %p or %p not unmapped: wait %u, CMD%d(%c) @ +0x%zx %ux%u in SG%u!\n",
host->pg.page, host->head_pg.page, host->wait, mrq->cmd->opcode,
data ? (data->flags & MMC_DATA_READ ? 'R' : 'W') : '-',
data ? host->offset : 0, data ? data->blocks : 0,
data ? data->blksz : 0, data ? data->sg_len : 0))
usdhi6_sg_unmap(host, true);
if (mrq->cmd->error ||
(data && data->error) ||
(mrq->stop && mrq->stop->error))
dev_dbg(mmc_dev(host->mmc), "%s(CMD%d: %ux%u): err %d %d %d\n",
__func__, mrq->cmd->opcode, data ? data->blocks : 0,
data ? data->blksz : 0,
mrq->cmd->error,
data ? data->error : 1,
mrq->stop ? mrq->stop->error : 1);
/* Disable DMA */
usdhi6_write(host, USDHI6_CC_EXT_MODE, 0);
host->wait = USDHI6_WAIT_FOR_REQUEST;
host->mrq = NULL;
mmc_request_done(host->mmc, mrq);
}
static int usdhi6_cmd_flags(struct usdhi6_host *host)
{
struct mmc_request *mrq = host->mrq;
struct mmc_command *cmd = mrq->cmd;
u16 opc = cmd->opcode;
if (host->app_cmd) {
host->app_cmd = false;
opc |= USDHI6_SD_CMD_APP;
}
if (mrq->data) {
opc |= USDHI6_SD_CMD_DATA;
if (mrq->data->flags & MMC_DATA_READ)
opc |= USDHI6_SD_CMD_READ;
if (cmd->opcode == MMC_READ_MULTIPLE_BLOCK ||
cmd->opcode == MMC_WRITE_MULTIPLE_BLOCK ||
(cmd->opcode == SD_IO_RW_EXTENDED &&
mrq->data->blocks > 1)) {
opc |= USDHI6_SD_CMD_MULTI;
if (!mrq->stop)
opc |= USDHI6_SD_CMD_CMD12_AUTO_OFF;
}
switch (mmc_resp_type(cmd)) {
case MMC_RSP_NONE:
opc |= USDHI6_SD_CMD_MODE_RSP_NONE;
break;
case MMC_RSP_R1:
opc |= USDHI6_SD_CMD_MODE_RSP_R1;
break;
case MMC_RSP_R1B:
opc |= USDHI6_SD_CMD_MODE_RSP_R1B;
break;
case MMC_RSP_R2:
opc |= USDHI6_SD_CMD_MODE_RSP_R2;
break;
case MMC_RSP_R3:
opc |= USDHI6_SD_CMD_MODE_RSP_R3;
break;
default:
dev_warn(mmc_dev(host->mmc),
"Unknown response type %d\n",
mmc_resp_type(cmd));
return -EINVAL;
}
}
return opc;
}
static int usdhi6_rq_start(struct usdhi6_host *host)
{
struct mmc_request *mrq = host->mrq;
struct mmc_command *cmd = mrq->cmd;
struct mmc_data *data = mrq->data;
int opc = usdhi6_cmd_flags(host);
int i;
if (opc < 0)
return opc;
for (i = 1000; i; i--) {
if (!(usdhi6_read(host, USDHI6_SD_INFO2) & USDHI6_SD_INFO2_CBSY))
break;
usleep_range(10, 100);
}
if (!i) {
dev_dbg(mmc_dev(host->mmc), "Command active, request aborted\n");
return -EAGAIN;
}
if (data) {
bool use_dma;
int ret = 0;
host->page_idx = 0;
if (cmd->opcode == SD_IO_RW_EXTENDED && data->blocks > 1) {
switch (data->blksz) {
case 512:
break;
case 32:
case 64:
case 128:
case 256:
if (mrq->stop)
ret = -EINVAL;
break;
default:
ret = -EINVAL;
}
} else if ((cmd->opcode == MMC_READ_MULTIPLE_BLOCK ||
cmd->opcode == MMC_WRITE_MULTIPLE_BLOCK) &&
data->blksz != 512) {
ret = -EINVAL;
}
if (ret < 0) {
dev_warn(mmc_dev(host->mmc), "%s(): %u blocks of %u bytes\n",
__func__, data->blocks, data->blksz);
return -EINVAL;
}
if (cmd->opcode == MMC_READ_MULTIPLE_BLOCK ||
cmd->opcode == MMC_WRITE_MULTIPLE_BLOCK ||
(cmd->opcode == SD_IO_RW_EXTENDED &&
data->blocks > 1))
usdhi6_sg_prep(host);
usdhi6_write(host, USDHI6_SD_SIZE, data->blksz);
if ((data->blksz >= USDHI6_MIN_DMA ||
data->blocks > 1) &&
(data->blksz % 4 ||
data->sg->offset % 4))
dev_dbg(mmc_dev(host->mmc),
"Bad SG of %u: %ux%u @ %u\n", data->sg_len,
data->blksz, data->blocks, data->sg->offset);
/* Enable DMA for USDHI6_MIN_DMA bytes or more */
use_dma = data->blksz >= USDHI6_MIN_DMA &&
!(data->blksz % 4) &&
usdhi6_dma_start(host) >= DMA_MIN_COOKIE;
if (use_dma)
usdhi6_write(host, USDHI6_CC_EXT_MODE, USDHI6_CC_EXT_MODE_SDRW);
dev_dbg(mmc_dev(host->mmc),
"%s(): request opcode %u, %u blocks of %u bytes in %u segments, %s %s @+0x%x%s\n",
__func__, cmd->opcode, data->blocks, data->blksz,
data->sg_len, use_dma ? "DMA" : "PIO",
data->flags & MMC_DATA_READ ? "read" : "write",
data->sg->offset, mrq->stop ? " + stop" : "");
} else {
dev_dbg(mmc_dev(host->mmc), "%s(): request opcode %u\n",
__func__, cmd->opcode);
}
/* We have to get a command completion interrupt with DMA too */
usdhi6_wait_for_resp(host);
host->wait = USDHI6_WAIT_FOR_CMD;
schedule_delayed_work(&host->timeout_work, host->timeout);
/* SEC bit is required to enable block counting by the core */
usdhi6_write(host, USDHI6_SD_STOP,
data && data->blocks > 1 ? USDHI6_SD_STOP_SEC : 0);
usdhi6_write(host, USDHI6_SD_ARG, cmd->arg);
/* Kick command execution */
usdhi6_write(host, USDHI6_SD_CMD, opc);
return 0;
}
static void usdhi6_request(struct mmc_host *mmc, struct mmc_request *mrq)
{
struct usdhi6_host *host = mmc_priv(mmc);
int ret;
cancel_delayed_work_sync(&host->timeout_work);
host->mrq = mrq;
host->sg = NULL;
usdhi6_timeout_set(host);
ret = usdhi6_rq_start(host);
if (ret < 0) {
mrq->cmd->error = ret;
usdhi6_request_done(host);
}
}
static int usdhi6_get_cd(struct mmc_host *mmc)
{
struct usdhi6_host *host = mmc_priv(mmc);
/* Read is atomic, no need to lock */
u32 status = usdhi6_read(host, USDHI6_SD_INFO1) & USDHI6_SD_INFO1_CD;
/*
* level status.CD CD_ACTIVE_HIGH card present
* 1 0 0 0
* 1 0 1 1
* 0 1 0 1
* 0 1 1 0
*/
return !status ^ !(mmc->caps2 & MMC_CAP2_CD_ACTIVE_HIGH);
}
static int usdhi6_get_ro(struct mmc_host *mmc)
{
struct usdhi6_host *host = mmc_priv(mmc);
/* No locking as above */
u32 status = usdhi6_read(host, USDHI6_SD_INFO1) & USDHI6_SD_INFO1_WP;
/*
* level status.WP RO_ACTIVE_HIGH card read-only
* 1 0 0 0
* 1 0 1 1
* 0 1 0 1
* 0 1 1 0
*/
return !status ^ !(mmc->caps2 & MMC_CAP2_RO_ACTIVE_HIGH);
}
static void usdhi6_enable_sdio_irq(struct mmc_host *mmc, int enable)
{
struct usdhi6_host *host = mmc_priv(mmc);
dev_dbg(mmc_dev(mmc), "%s(): %sable\n", __func__, enable ? "en" : "dis");
if (enable) {
host->sdio_mask = USDHI6_SDIO_INFO1_IRQ & ~USDHI6_SDIO_INFO1_IOIRQ;
usdhi6_write(host, USDHI6_SDIO_INFO1_MASK, host->sdio_mask);
usdhi6_write(host, USDHI6_SDIO_MODE, 1);
} else {
usdhi6_write(host, USDHI6_SDIO_MODE, 0);
usdhi6_write(host, USDHI6_SDIO_INFO1_MASK, USDHI6_SDIO_INFO1_IRQ);
host->sdio_mask = USDHI6_SDIO_INFO1_IRQ;
}
}
static struct mmc_host_ops usdhi6_ops = {
.request = usdhi6_request,
.set_ios = usdhi6_set_ios,
.get_cd = usdhi6_get_cd,
.get_ro = usdhi6_get_ro,
.enable_sdio_irq = usdhi6_enable_sdio_irq,
};
/* State machine handlers */
static void usdhi6_resp_cmd12(struct usdhi6_host *host)
{
struct mmc_command *cmd = host->mrq->stop;
cmd->resp[0] = usdhi6_read(host, USDHI6_SD_RSP10);
}
static void usdhi6_resp_read(struct usdhi6_host *host)
{
struct mmc_command *cmd = host->mrq->cmd;
u32 *rsp = cmd->resp, tmp = 0;
int i;
/*
* RSP10 39-8
* RSP32 71-40
* RSP54 103-72
* RSP76 127-104
* R2-type response:
* resp[0] = r[127..96]
* resp[1] = r[95..64]
* resp[2] = r[63..32]
* resp[3] = r[31..0]
* Other responses:
* resp[0] = r[39..8]
*/
if (mmc_resp_type(cmd) == MMC_RSP_NONE)
return;
if (!(host->irq_status & USDHI6_SD_INFO1_RSP_END)) {
dev_err(mmc_dev(host->mmc),
"CMD%d: response expected but is missing!\n", cmd->opcode);
return;
}
if (mmc_resp_type(cmd) & MMC_RSP_136)
for (i = 0; i < 4; i++) {
if (i)
rsp[3 - i] = tmp >> 24;
tmp = usdhi6_read(host, USDHI6_SD_RSP10 + i * 8);
rsp[3 - i] |= tmp << 8;
}
else if (cmd->opcode == MMC_READ_MULTIPLE_BLOCK ||
cmd->opcode == MMC_WRITE_MULTIPLE_BLOCK)
/* Read RSP54 to avoid conflict with auto CMD12 */
rsp[0] = usdhi6_read(host, USDHI6_SD_RSP54);
else
rsp[0] = usdhi6_read(host, USDHI6_SD_RSP10);
dev_dbg(mmc_dev(host->mmc), "Response 0x%x\n", rsp[0]);
}
static int usdhi6_blk_read(struct usdhi6_host *host)
{
struct mmc_data *data = host->mrq->data;
u32 *p;
int i, rest;
if (host->io_error) {
data->error = usdhi6_error_code(host);
goto error;
}
if (host->pg.page) {
p = host->blk_page + host->offset;
} else {
p = usdhi6_sg_map(host);
if (!p) {
data->error = -ENOMEM;
goto error;
}
}
for (i = 0; i < data->blksz / 4; i++, p++)
*p = usdhi6_read(host, USDHI6_SD_BUF0);
rest = data->blksz % 4;
for (i = 0; i < (rest + 1) / 2; i++) {
u16 d = usdhi6_read16(host, USDHI6_SD_BUF0);
((u8 *)p)[2 * i] = ((u8 *)&d)[0];
if (rest > 1 && !i)
((u8 *)p)[2 * i + 1] = ((u8 *)&d)[1];
}
return 0;
error:
dev_dbg(mmc_dev(host->mmc), "%s(): %d\n", __func__, data->error);
host->wait = USDHI6_WAIT_FOR_REQUEST;
return data->error;
}
static int usdhi6_blk_write(struct usdhi6_host *host)
{
struct mmc_data *data = host->mrq->data;
u32 *p;
int i, rest;
if (host->io_error) {
data->error = usdhi6_error_code(host);
goto error;
}
if (host->pg.page) {
p = host->blk_page + host->offset;
} else {
p = usdhi6_sg_map(host);
if (!p) {
data->error = -ENOMEM;
goto error;
}
}
for (i = 0; i < data->blksz / 4; i++, p++)
usdhi6_write(host, USDHI6_SD_BUF0, *p);
rest = data->blksz % 4;
for (i = 0; i < (rest + 1) / 2; i++) {
u16 d;
((u8 *)&d)[0] = ((u8 *)p)[2 * i];
if (rest > 1 && !i)
((u8 *)&d)[1] = ((u8 *)p)[2 * i + 1];
else
((u8 *)&d)[1] = 0;
usdhi6_write16(host, USDHI6_SD_BUF0, d);
}
return 0;
error:
dev_dbg(mmc_dev(host->mmc), "%s(): %d\n", __func__, data->error);
host->wait = USDHI6_WAIT_FOR_REQUEST;
return data->error;
}
static int usdhi6_stop_cmd(struct usdhi6_host *host)
{
struct mmc_request *mrq = host->mrq;
switch (mrq->cmd->opcode) {
case MMC_READ_MULTIPLE_BLOCK:
case MMC_WRITE_MULTIPLE_BLOCK:
if (mrq->stop->opcode == MMC_STOP_TRANSMISSION) {
host->wait = USDHI6_WAIT_FOR_STOP;
return 0;
}
/* Unsupported STOP command */
default:
dev_err(mmc_dev(host->mmc),
"unsupported stop CMD%d for CMD%d\n",
mrq->stop->opcode, mrq->cmd->opcode);
mrq->stop->error = -EOPNOTSUPP;
}
return -EOPNOTSUPP;
}
static bool usdhi6_end_cmd(struct usdhi6_host *host)
{
struct mmc_request *mrq = host->mrq;
struct mmc_command *cmd = mrq->cmd;
if (host->io_error) {
cmd->error = usdhi6_error_code(host);
return false;
}
usdhi6_resp_read(host);
if (!mrq->data)
return false;
if (host->dma_active) {
usdhi6_dma_kick(host);
if (!mrq->stop)
host->wait = USDHI6_WAIT_FOR_DMA;
else if (usdhi6_stop_cmd(host) < 0)
return false;
} else if (mrq->data->flags & MMC_DATA_READ) {
if (cmd->opcode == MMC_READ_MULTIPLE_BLOCK ||
(cmd->opcode == SD_IO_RW_EXTENDED &&
mrq->data->blocks > 1))
host->wait = USDHI6_WAIT_FOR_MREAD;
else
host->wait = USDHI6_WAIT_FOR_READ;
} else {
if (cmd->opcode == MMC_WRITE_MULTIPLE_BLOCK ||
(cmd->opcode == SD_IO_RW_EXTENDED &&
mrq->data->blocks > 1))
host->wait = USDHI6_WAIT_FOR_MWRITE;
else
host->wait = USDHI6_WAIT_FOR_WRITE;
}
return true;
}
static bool usdhi6_read_block(struct usdhi6_host *host)
{
/* ACCESS_END IRQ is already unmasked */
int ret = usdhi6_blk_read(host);
/*
* Have to force unmapping both pages: the single block could have been
* cross-page, in which case for single-block IO host->page_idx == 0.
* So, if we don't force, the second page won't be unmapped.
*/
usdhi6_sg_unmap(host, true);
if (ret < 0)
return false;
host->wait = USDHI6_WAIT_FOR_DATA_END;
return true;
}
static bool usdhi6_mread_block(struct usdhi6_host *host)
{
int ret = usdhi6_blk_read(host);
if (ret < 0)
return false;
usdhi6_sg_advance(host);
return !host->mrq->data->error &&
(host->wait != USDHI6_WAIT_FOR_DATA_END || !host->mrq->stop);
}
static bool usdhi6_write_block(struct usdhi6_host *host)
{
int ret = usdhi6_blk_write(host);
/* See comment in usdhi6_read_block() */
usdhi6_sg_unmap(host, true);
if (ret < 0)
return false;
host->wait = USDHI6_WAIT_FOR_DATA_END;
return true;
}
static bool usdhi6_mwrite_block(struct usdhi6_host *host)
{
int ret = usdhi6_blk_write(host);
if (ret < 0)
return false;
usdhi6_sg_advance(host);
return !host->mrq->data->error &&
(host->wait != USDHI6_WAIT_FOR_DATA_END || !host->mrq->stop);
}
/* Interrupt & timeout handlers */
static irqreturn_t usdhi6_sd_bh(int irq, void *dev_id)
{
struct usdhi6_host *host = dev_id;
struct mmc_request *mrq;
struct mmc_command *cmd;
struct mmc_data *data;
bool io_wait = false;
cancel_delayed_work_sync(&host->timeout_work);
mrq = host->mrq;
if (!mrq)
return IRQ_HANDLED;
cmd = mrq->cmd;
data = mrq->data;
switch (host->wait) {
case USDHI6_WAIT_FOR_REQUEST:
/* We're too late, the timeout has already kicked in */
return IRQ_HANDLED;
case USDHI6_WAIT_FOR_CMD:
/* Wait for data? */
io_wait = usdhi6_end_cmd(host);
break;
case USDHI6_WAIT_FOR_MREAD:
/* Wait for more data? */
io_wait = usdhi6_mread_block(host);
break;
case USDHI6_WAIT_FOR_READ:
/* Wait for data end? */
io_wait = usdhi6_read_block(host);
break;
case USDHI6_WAIT_FOR_MWRITE:
/* Wait data to write? */
io_wait = usdhi6_mwrite_block(host);
break;
case USDHI6_WAIT_FOR_WRITE:
/* Wait for data end? */
io_wait = usdhi6_write_block(host);
break;
case USDHI6_WAIT_FOR_DMA:
usdhi6_dma_check_error(host);
break;
case USDHI6_WAIT_FOR_STOP:
usdhi6_write(host, USDHI6_SD_STOP, 0);
if (host->io_error) {
int ret = usdhi6_error_code(host);
if (mrq->stop)
mrq->stop->error = ret;
else
mrq->data->error = ret;
dev_warn(mmc_dev(host->mmc), "%s(): %d\n", __func__, ret);
break;
}
usdhi6_resp_cmd12(host);
mrq->stop->error = 0;
break;
case USDHI6_WAIT_FOR_DATA_END:
if (host->io_error) {
mrq->data->error = usdhi6_error_code(host);
dev_warn(mmc_dev(host->mmc), "%s(): %d\n", __func__,
mrq->data->error);
}
break;
default:
cmd->error = -EFAULT;
dev_err(mmc_dev(host->mmc), "Invalid state %u\n", host->wait);
usdhi6_request_done(host);
return IRQ_HANDLED;
}
if (io_wait) {
schedule_delayed_work(&host->timeout_work, host->timeout);
/* Wait for more data or ACCESS_END */
if (!host->dma_active)
usdhi6_wait_for_brwe(host, mrq->data->flags & MMC_DATA_READ);
return IRQ_HANDLED;
}
if (!cmd->error) {
if (data) {
if (!data->error) {
if (host->wait != USDHI6_WAIT_FOR_STOP &&
host->mrq->stop &&
!host->mrq->stop->error &&
!usdhi6_stop_cmd(host)) {
/* Sending STOP */
usdhi6_wait_for_resp(host);
schedule_delayed_work(&host->timeout_work,
host->timeout);
return IRQ_HANDLED;
}
data->bytes_xfered = data->blocks * data->blksz;
} else {
/* Data error: might need to unmap the last page */
dev_warn(mmc_dev(host->mmc), "%s(): data error %d\n",
__func__, data->error);
usdhi6_sg_unmap(host, true);
}
} else if (cmd->opcode == MMC_APP_CMD) {
host->app_cmd = true;
}
}
usdhi6_request_done(host);
return IRQ_HANDLED;
}
static irqreturn_t usdhi6_sd(int irq, void *dev_id)
{
struct usdhi6_host *host = dev_id;
u16 status, status2, error;
status = usdhi6_read(host, USDHI6_SD_INFO1) & ~host->status_mask &
~USDHI6_SD_INFO1_CARD;
status2 = usdhi6_read(host, USDHI6_SD_INFO2) & ~host->status2_mask;
usdhi6_only_cd(host);
dev_dbg(mmc_dev(host->mmc),
"IRQ status = 0x%08x, status2 = 0x%08x\n", status, status2);
if (!status && !status2)
return IRQ_NONE;
error = status2 & USDHI6_SD_INFO2_ERR;
/* Ack / clear interrupts */
if (USDHI6_SD_INFO1_IRQ & status)
usdhi6_write(host, USDHI6_SD_INFO1,
0xffff & ~(USDHI6_SD_INFO1_IRQ & status));
if (USDHI6_SD_INFO2_IRQ & status2) {
if (error)
/* In error cases BWE and BRE aren't cleared automatically */
status2 |= USDHI6_SD_INFO2_BWE | USDHI6_SD_INFO2_BRE;
usdhi6_write(host, USDHI6_SD_INFO2,
0xffff & ~(USDHI6_SD_INFO2_IRQ & status2));
}
host->io_error = error;
host->irq_status = status;
if (error) {
/* Don't pollute the log with unsupported command timeouts */
if (host->wait != USDHI6_WAIT_FOR_CMD ||
error != USDHI6_SD_INFO2_RSP_TOUT)
dev_warn(mmc_dev(host->mmc),
"%s(): INFO2 error bits 0x%08x\n",
__func__, error);
else
dev_dbg(mmc_dev(host->mmc),
"%s(): INFO2 error bits 0x%08x\n",
__func__, error);
}
return IRQ_WAKE_THREAD;
}
static irqreturn_t usdhi6_sdio(int irq, void *dev_id)
{
struct usdhi6_host *host = dev_id;
u32 status = usdhi6_read(host, USDHI6_SDIO_INFO1) & ~host->sdio_mask;
dev_dbg(mmc_dev(host->mmc), "%s(): status 0x%x\n", __func__, status);
if (!status)
return IRQ_NONE;
usdhi6_write(host, USDHI6_SDIO_INFO1, ~status);
mmc_signal_sdio_irq(host->mmc);
return IRQ_HANDLED;
}
static irqreturn_t usdhi6_cd(int irq, void *dev_id)
{
struct usdhi6_host *host = dev_id;
struct mmc_host *mmc = host->mmc;
u16 status;
/* We're only interested in hotplug events here */
status = usdhi6_read(host, USDHI6_SD_INFO1) & ~host->status_mask &
USDHI6_SD_INFO1_CARD;
if (!status)
return IRQ_NONE;
/* Ack */
usdhi6_write(host, USDHI6_SD_INFO1, ~status);
if (!work_pending(&mmc->detect.work) &&
(((status & USDHI6_SD_INFO1_CARD_INSERT) &&
!mmc->card) ||
((status & USDHI6_SD_INFO1_CARD_EJECT) &&
mmc->card)))
mmc_detect_change(mmc, msecs_to_jiffies(100));
return IRQ_HANDLED;
}
/*
* Actually this should not be needed, if the built-in timeout works reliably in
* the both PIO cases and DMA never fails. But if DMA does fail, a timeout
* handler might be the only way to catch the error.
*/
static void usdhi6_timeout_work(struct work_struct *work)
{
struct delayed_work *d = container_of(work, struct delayed_work, work);
struct usdhi6_host *host = container_of(d, struct usdhi6_host, timeout_work);
struct mmc_request *mrq = host->mrq;
struct mmc_data *data = mrq ? mrq->data : NULL;
struct scatterlist *sg = host->sg ?: data->sg;
dev_warn(mmc_dev(host->mmc),
"%s timeout wait %u CMD%d: IRQ 0x%08x:0x%08x, last IRQ 0x%08x\n",
host->dma_active ? "DMA" : "PIO",
host->wait, mrq ? mrq->cmd->opcode : -1,
usdhi6_read(host, USDHI6_SD_INFO1),
usdhi6_read(host, USDHI6_SD_INFO2), host->irq_status);
if (host->dma_active) {
usdhi6_dma_kill(host);
usdhi6_dma_stop_unmap(host);
}
switch (host->wait) {
default:
dev_err(mmc_dev(host->mmc), "Invalid state %u\n", host->wait);
/* mrq can be NULL in this actually impossible case */
case USDHI6_WAIT_FOR_CMD:
usdhi6_error_code(host);
if (mrq)
mrq->cmd->error = -ETIMEDOUT;
break;
case USDHI6_WAIT_FOR_STOP:
usdhi6_error_code(host);
mrq->stop->error = -ETIMEDOUT;
break;
case USDHI6_WAIT_FOR_DMA:
case USDHI6_WAIT_FOR_MREAD:
case USDHI6_WAIT_FOR_MWRITE:
case USDHI6_WAIT_FOR_READ:
case USDHI6_WAIT_FOR_WRITE:
dev_dbg(mmc_dev(host->mmc),
"%c: page #%u @ +0x%zx %ux%u in SG%u. Current SG %u bytes @ %u\n",
data->flags & MMC_DATA_READ ? 'R' : 'W', host->page_idx,
host->offset, data->blocks, data->blksz, data->sg_len,
sg_dma_len(sg), sg->offset);
usdhi6_sg_unmap(host, true);
/*
* If USDHI6_WAIT_FOR_DATA_END times out, we have already unmapped
* the page
*/
case USDHI6_WAIT_FOR_DATA_END:
usdhi6_error_code(host);
data->error = -ETIMEDOUT;
}
if (mrq)
usdhi6_request_done(host);
}
/* Probe / release */
static const struct of_device_id usdhi6_of_match[] = {
{.compatible = "renesas,usdhi6rol0"},
{}
};
MODULE_DEVICE_TABLE(of, usdhi6_of_match);
static int usdhi6_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct mmc_host *mmc;
struct usdhi6_host *host;
struct resource *res;
int irq_cd, irq_sd, irq_sdio;
u32 version;
int ret;
if (!dev->of_node)
return -ENODEV;
irq_cd = platform_get_irq_byname(pdev, "card detect");
irq_sd = platform_get_irq_byname(pdev, "data");
irq_sdio = platform_get_irq_byname(pdev, "SDIO");
if (irq_sd < 0 || irq_sdio < 0)
return -ENODEV;
mmc = mmc_alloc_host(sizeof(struct usdhi6_host), dev);
if (!mmc)
return -ENOMEM;
ret = mmc_regulator_get_supply(mmc);
if (ret == -EPROBE_DEFER)
goto e_free_mmc;
ret = mmc_of_parse(mmc);
if (ret < 0)
goto e_free_mmc;
host = mmc_priv(mmc);
host->mmc = mmc;
host->wait = USDHI6_WAIT_FOR_REQUEST;
host->timeout = msecs_to_jiffies(4000);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
host->base = devm_ioremap_resource(dev, res);
if (IS_ERR(host->base)) {
ret = PTR_ERR(host->base);
goto e_free_mmc;
}
host->clk = devm_clk_get(dev, NULL);
if (IS_ERR(host->clk)) {
ret = PTR_ERR(host->clk);
goto e_free_mmc;
}
host->imclk = clk_get_rate(host->clk);
ret = clk_prepare_enable(host->clk);
if (ret < 0)
goto e_free_mmc;
version = usdhi6_read(host, USDHI6_VERSION);
if ((version & 0xfff) != 0xa0d) {
dev_err(dev, "Version not recognized %x\n", version);
goto e_clk_off;
}
dev_info(dev, "A USDHI6ROL0 SD host detected with %d ports\n",
usdhi6_read(host, USDHI6_SD_PORT_SEL) >> USDHI6_SD_PORT_SEL_PORTS_SHIFT);
usdhi6_mask_all(host);
if (irq_cd >= 0) {
ret = devm_request_irq(dev, irq_cd, usdhi6_cd, 0,
dev_name(dev), host);
if (ret < 0)
goto e_clk_off;
} else {
mmc->caps |= MMC_CAP_NEEDS_POLL;
}
ret = devm_request_threaded_irq(dev, irq_sd, usdhi6_sd, usdhi6_sd_bh, 0,
dev_name(dev), host);
if (ret < 0)
goto e_clk_off;
ret = devm_request_irq(dev, irq_sdio, usdhi6_sdio, 0,
dev_name(dev), host);
if (ret < 0)
goto e_clk_off;
INIT_DELAYED_WORK(&host->timeout_work, usdhi6_timeout_work);
usdhi6_dma_request(host, res->start);
mmc->ops = &usdhi6_ops;
mmc->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED |
MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_DDR50 | MMC_CAP_SDIO_IRQ;
/* Set .max_segs to some random number. Feel free to adjust. */
mmc->max_segs = 32;
mmc->max_blk_size = 512;
mmc->max_req_size = PAGE_CACHE_SIZE * mmc->max_segs;
mmc->max_blk_count = mmc->max_req_size / mmc->max_blk_size;
/*
* Setting .max_seg_size to 1 page would simplify our page-mapping code,
* But OTOH, having large segments makes DMA more efficient. We could
* check, whether we managed to get DMA and fall back to 1 page
* segments, but if we do manage to obtain DMA and then it fails at
* run-time and we fall back to PIO, we will continue getting large
* segments. So, we wouldn't be able to get rid of the code anyway.
*/
mmc->max_seg_size = mmc->max_req_size;
if (!mmc->f_max)
mmc->f_max = host->imclk;
mmc->f_min = host->imclk / 512;
platform_set_drvdata(pdev, host);
ret = mmc_add_host(mmc);
if (ret < 0)
goto e_clk_off;
return 0;
e_clk_off:
clk_disable_unprepare(host->clk);
e_free_mmc:
mmc_free_host(mmc);
return ret;
}
static int usdhi6_remove(struct platform_device *pdev)
{
struct usdhi6_host *host = platform_get_drvdata(pdev);
mmc_remove_host(host->mmc);
usdhi6_mask_all(host);
cancel_delayed_work_sync(&host->timeout_work);
usdhi6_dma_release(host);
clk_disable_unprepare(host->clk);
mmc_free_host(host->mmc);
return 0;
}
static struct platform_driver usdhi6_driver = {
.probe = usdhi6_probe,
.remove = usdhi6_remove,
.driver = {
.name = "usdhi6rol0",
.of_match_table = usdhi6_of_match,
},
};
module_platform_driver(usdhi6_driver);
MODULE_DESCRIPTION("Renesas usdhi6rol0 SD/SDIO host driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:usdhi6rol0");
MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");