Hi Guennadi,
One other point, copyright should be Renesas Electronics Europe Ltd
Thanks
Phil
On 15 April 2014 15:05, Phil wrote:
> Subject: RE: [PATCH] mmc: add a driver for the Renesas v08r07s01e SD/SDIO
> host controller
>
> Hi Guennadi,
>
> Only one comment from me, the name of this IP block should be usdhi6rol0
> (yes, I know it's not exactly a very catchy name!), not v08r07s01e.
>
> Thanks
> Phil
>
> On 12 April 2014 18:42, Guennadi wrote:
> > Subject: [PATCH] mmc: add a driver for the Renesas v08r07s01e SD/SDIO
> > host controller
> >
> > This patch adds a driver for the Renesas v08r07s01e SD/SDIO host controller
> > in both PIO and DMA modes.
> >
> > Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@xxxxxx>
> > ---
> >
> > Tested on a Xilinx zc706-based board with SD, MMC and SDIO cards.
> >
> > .../devicetree/bindings/mmc/v08r07s01e.txt | 33 +
> > drivers/mmc/host/Kconfig | 6 +
> > drivers/mmc/host/Makefile | 1 +
> > drivers/mmc/host/v08r07s01e.c | 1835
> ++++++++++++++++++++
> > 4 files changed, 1875 insertions(+)
> > create mode 100644
> > Documentation/devicetree/bindings/mmc/v08r07s01e.txt
> > create mode 100644 drivers/mmc/host/v08r07s01e.c
> >
> > diff --git a/Documentation/devicetree/bindings/mmc/v08r07s01e.txt
> > b/Documentation/devicetree/bindings/mmc/v08r07s01e.txt
> > new file mode 100644
> > index 0000000..60e6cb5
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/mmc/v08r07s01e.txt
> > @@ -0,0 +1,33 @@
> > +* Renesas v08r07s01e SD/SDIO host controller
> > +
> > +Required properties:
> > +
> > +- compatible: must be
> > + "renesas,v08r07s01e"
> > +- interrupts: 3 interrupts, named "card detect", "data" and "SDIO" must
> > be
> > + specified
> > +- clocks: a clock binding for the IMCLK input
> > +
> > +Optional properties:
> > +
> > +- vmmc-supply: a phandle of a regulator, supplying Vcc to the card
> > +- vqmmc-supply: a phandle of a regulator, supplying VccQ to the card
> > +
> > +Additionally any standard mmc bindings from mmc.txt can be used.
> > +
> > +Example:
> > +
> > +sd0: sd@ab000000 {
> > + compatible = "renesas,v08r07s01e";
> > + reg = <0xab000000 0x200>;
> > + interrupts = <0 23 0x4
> > + 0 24 0x4
> > + 0 25 0x4>;
> > + interrupt-names = "card detect", "data", "SDIO";
> > + bus-width = <4>;
> > + max-frequency = <50000000>;
> > + cap-power-off-card;
> > + clocks = <&imclk>;
> > + vmmc-supply = <&vcc_sd0>;
> > + vqmmc-supply = <&vccq_sd0>;
> > +};
> > diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
> > index 8aaf8c1..0feccd5 100644
> > --- a/drivers/mmc/host/Kconfig
> > +++ b/drivers/mmc/host/Kconfig
> > @@ -688,6 +688,12 @@ config MMC_WMT
> > To compile this driver as a module, choose M here: the
> > module will be called wmt-sdmmc.
> >
> > +config MMC_V08R07S01E
> > + tristate "Renesas V08R07S01E SD/SDIO Host Controller support"
> > + help
> > + This selects support for the Renesas V08R07S01E SD/SDIO
> > + Host Controller
> > +
> > config MMC_REALTEK_PCI
> > tristate "Realtek PCI-E SD/MMC Card Interface Driver"
> > depends on MFD_RTSX_PCI
> > diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
> > index 0c8aa5e..d7d3ee9 100644
> > --- a/drivers/mmc/host/Makefile
> > +++ b/drivers/mmc/host/Makefile
> > @@ -50,6 +50,7 @@ obj-$(CONFIG_MMC_JZ4740) += jz4740_mmc.o
> > obj-$(CONFIG_MMC_VUB300) += vub300.o
> > obj-$(CONFIG_MMC_USHC) += ushc.o
> > obj-$(CONFIG_MMC_WMT) += wmt-sdmmc.o
> > +obj-$(CONFIG_MMC_V08R07S01E) += v08r07s01e.o
> >
> > obj-$(CONFIG_MMC_REALTEK_PCI) += rtsx_pci_sdmmc.o
> >
> > diff --git a/drivers/mmc/host/v08r07s01e.c
> > b/drivers/mmc/host/v08r07s01e.c
> > new file mode 100644
> > index 0000000..4eb9ce1
> > --- /dev/null
> > +++ b/drivers/mmc/host/v08r07s01e.c
> > @@ -0,0 +1,1835 @@
> > +/*
> > + * Copyright (C) 2013-2014 Renesas Europe Ltd.
> > + * Author: Guennadi Liakhovetski <g.liakhovetski@xxxxxx>
> > + *
> > + * 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 V08R07_SD_CMD 0x0000
> > +#define V08R07_SD_PORT_SEL 0x0004
> > +#define V08R07_SD_ARG 0x0008
> > +#define V08R07_SD_STOP 0x0010
> > +#define V08R07_SD_SECCNT 0x0014
> > +#define V08R07_SD_RSP10 0x0018
> > +#define V08R07_SD_RSP32 0x0020
> > +#define V08R07_SD_RSP54 0x0028
> > +#define V08R07_SD_RSP76 0x0030
> > +#define V08R07_SD_INFO1 0x0038
> > +#define V08R07_SD_INFO2 0x003c
> > +#define V08R07_SD_INFO1_MASK 0x0040
> > +#define V08R07_SD_INFO2_MASK 0x0044
> > +#define V08R07_SD_CLK_CTRL 0x0048
> > +#define V08R07_SD_SIZE 0x004c
> > +#define V08R07_SD_OPTION 0x0050
> > +#define V08R07_SD_ERR_STS1 0x0058
> > +#define V08R07_SD_ERR_STS2 0x005c
> > +#define V08R07_SD_BUF0 0x0060
> > +#define V08R07_SDIO_MODE 0x0068
> > +#define V08R07_SDIO_INFO1 0x006c
> > +#define V08R07_SDIO_INFO1_MASK 0x0070
> > +#define V08R07_CC_EXT_MODE 0x01b0
> > +#define V08R07_SOFT_RST 0x01c0
> > +#define V08R07_VERSION 0x01c4
> > +#define V08R07_HOST_MODE 0x01c8
> > +#define V08R07_SDIF_MODE 0x01cc
> > +
> > +#define V08R07_SD_CMD_APP 0x0040
> > +#define V08R07_SD_CMD_MODE_RSP_AUTO 0x0000
> > +#define V08R07_SD_CMD_MODE_RSP_NONE 0x0300
> > +#define V08R07_SD_CMD_MODE_RSP_R1 0x0400 /* Also R5, R6, R7 */
> > +#define V08R07_SD_CMD_MODE_RSP_R1B 0x0500 /* R1b */
> > +#define V08R07_SD_CMD_MODE_RSP_R2 0x0600
> > +#define V08R07_SD_CMD_MODE_RSP_R3 0x0700 /* Also R4 */
> > +#define V08R07_SD_CMD_DATA 0x0800
> > +#define V08R07_SD_CMD_READ 0x1000
> > +#define V08R07_SD_CMD_MULTI 0x2000
> > +#define V08R07_SD_CMD_CMD12_AUTO_OFF 0x4000
> > +
> > +#define V08R07_CC_EXT_MODE_SDRW BIT(1)
> > +
> > +#define V08R07_SD_INFO1_RSP_END BIT(0)
> > +#define V08R07_SD_INFO1_ACCESS_END BIT(2)
> > +#define V08R07_SD_INFO1_CARD_OUT BIT(3)
> > +#define V08R07_SD_INFO1_CARD_IN BIT(4)
> > +#define V08R07_SD_INFO1_CD BIT(5)
> > +#define V08R07_SD_INFO1_WP BIT(7)
> > +#define V08R07_SD_INFO1_D3_CARD_OUT BIT(8)
> > +#define V08R07_SD_INFO1_D3_CARD_IN BIT(9)
> > +
> > +#define V08R07_SD_INFO2_CMD_ERR BIT(0)
> > +#define V08R07_SD_INFO2_CRC_ERR BIT(1)
> > +#define V08R07_SD_INFO2_END_ERR BIT(2)
> > +#define V08R07_SD_INFO2_TOUT BIT(3)
> > +#define V08R07_SD_INFO2_IWA_ERR BIT(4)
> > +#define V08R07_SD_INFO2_IRA_ERR BIT(5)
> > +#define V08R07_SD_INFO2_RSP_TOUT BIT(6)
> > +#define V08R07_SD_INFO2_SDDAT0 BIT(7)
> > +#define V08R07_SD_INFO2_BRE BIT(8)
> > +#define V08R07_SD_INFO2_BWE BIT(9)
> > +#define V08R07_SD_INFO2_SCLKDIVEN BIT(13)
> > +#define V08R07_SD_INFO2_CBSY BIT(14)
> > +#define V08R07_SD_INFO2_ILA BIT(15)
> > +
> > +#define V08R07_SD_INFO1_CARD_INSERT (V08R07_SD_INFO1_CARD_IN
> |
> > V08R07_SD_INFO1_D3_CARD_IN)
> > +#define V08R07_SD_INFO1_CARD_EJECT (V08R07_SD_INFO1_CARD_OUT
> |
> > V08R07_SD_INFO1_D3_CARD_OUT)
> > +#define V08R07_SD_INFO1_CARD (V08R07_SD_INFO1_CARD_INSERT |
> > V08R07_SD_INFO1_CARD_EJECT)
> > +#define V08R07_SD_INFO1_CARD_CD (V08R07_SD_INFO1_CARD_IN |
> > V08R07_SD_INFO1_CARD_OUT)
> > +
> > +#define V08R07_SD_INFO2_ERR (V08R07_SD_INFO2_CMD_ERR |
> > \
> > + V08R07_SD_INFO2_CRC_ERR | V08R07_SD_INFO2_END_ERR | \
> > + V08R07_SD_INFO2_TOUT | V08R07_SD_INFO2_IWA_ERR | \
> > + V08R07_SD_INFO2_IRA_ERR | V08R07_SD_INFO2_RSP_TOUT |
> > \
> > + V08R07_SD_INFO2_ILA)
> > +
> > +#define V08R07_SD_INFO1_IRQ (V08R07_SD_INFO1_RSP_END |
> > V08R07_SD_INFO1_ACCESS_END | \
> > + V08R07_SD_INFO1_CARD)
> > +
> > +#define V08R07_SD_INFO2_IRQ (V08R07_SD_INFO2_ERR |
> > V08R07_SD_INFO2_BRE | \
> > + V08R07_SD_INFO2_BWE | 0x0800 |
> > V08R07_SD_INFO2_ILA)
> > +
> > +#define V08R07_SD_CLK_CTRL_SCLKEN BIT(8)
> > +
> > +#define V08R07_SD_STOP_STP BIT(0)
> > +#define V08R07_SD_STOP_SEC BIT(8)
> > +
> > +#define V08R07_SDIO_INFO1_IOIRQ BIT(0)
> > +#define V08R07_SDIO_INFO1_EXPUB52 BIT(14)
> > +#define V08R07_SDIO_INFO1_EXWT BIT(15)
> > +
> > +#define V08R07_SDIO_INFO1_IRQ (V08R07_SDIO_INFO1_IOIRQ | 3 | \
> > + V08R07_SDIO_INFO1_EXPUB52 |
> > V08R07_SDIO_INFO1_EXWT)
> > +
> > +#define V08R07_MIN_DMA 64
> > +
> > +enum v08r07_wait_for {
> > + V08R07_WAIT_FOR_REQUEST,
> > + V08R07_WAIT_FOR_CMD,
> > + V08R07_WAIT_FOR_MREAD,
> > + V08R07_WAIT_FOR_MWRITE,
> > + V08R07_WAIT_FOR_READ,
> > + V08R07_WAIT_FOR_WRITE,
> > + V08R07_WAIT_FOR_DATA_END,
> > + V08R07_WAIT_FOR_STOP,
> > + V08R07_WAIT_FOR_DMA,
> > +};
> > +
> > +struct v08r07_page {
> > + struct page *page;
> > + void *mapped; /* mapped page */
> > +};
> > +
> > +struct v08r07_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 v08r07_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 v08r07_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 v08r07_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 v08r07_write(struct v08r07_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 v08r07_write16(struct v08r07_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 v08r07_read(struct v08r07_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 v08r07_read16(struct v08r07_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 v08r07_irq_enable(struct v08r07_host *host, u32 info1, u32
> > info2)
> > +{
> > + host->status_mask = V08R07_SD_INFO1_IRQ & ~info1;
> > + host->status2_mask = V08R07_SD_INFO2_IRQ & ~info2;
> > + v08r07_write(host, V08R07_SD_INFO1_MASK, host->status_mask);
> > + v08r07_write(host, V08R07_SD_INFO2_MASK, host->status2_mask);
> > +}
> > +
> > +static void v08r07_wait_for_resp(struct v08r07_host *host)
> > +{
> > + v08r07_irq_enable(host, V08R07_SD_INFO1_RSP_END |
> > + V08R07_SD_INFO1_ACCESS_END |
> > V08R07_SD_INFO1_CARD_CD,
> > + V08R07_SD_INFO2_ERR);
> > +}
> > +
> > +static void v08r07_wait_for_brwe(struct v08r07_host *host, bool read)
> > +{
> > + v08r07_irq_enable(host, V08R07_SD_INFO1_ACCESS_END |
> > + V08R07_SD_INFO1_CARD_CD,
> > V08R07_SD_INFO2_ERR |
> > + (read ? V08R07_SD_INFO2_BRE :
> > V08R07_SD_INFO2_BWE));
> > +}
> > +
> > +static void v08r07_only_cd(struct v08r07_host *host)
> > +{
> > + /* Mask all except card hotplug */
> > + v08r07_irq_enable(host, V08R07_SD_INFO1_CARD_CD, 0);
> > +}
> > +
> > +static void v08r07_mask_all(struct v08r07_host *host)
> > +{
> > + v08r07_irq_enable(host, 0, 0);
> > +}
> > +
> > +static int v08r07_error_code(struct v08r07_host *host)
> > +{
> > + u32 err;
> > +
> > + v08r07_write(host, V08R07_SD_STOP, V08R07_SD_STOP_STP);
> > +
> > + if (host->io_error &
> > + (V08R07_SD_INFO2_RSP_TOUT | V08R07_SD_INFO2_TOUT)) {
> > + u32 rsp54 = v08r07_read(host, V08R07_SD_RSP54);
> > + int opc = host->mrq ? host->mrq->cmd->opcode : -1;
> > +
> > + err = v08r07_read(host, V08R07_SD_ERR_STS2);
> > + /* Response timeout is often normal, don't spam the log */
> > + if (host->wait == V08R07_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 = v08r07_read(host, V08R07_SD_ERR_STS1);
> > + if (err != 0x2000)
> > + 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 & V08R07_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 v08r07_blk_bounce(struct v08r07_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 v08r07_sg_prep(struct v08r07_host *host)
> > +{
> > + struct mmc_request *mrq = host->mrq;
> > + struct mmc_data *data = mrq->data;
> > +
> > + v08r07_write(host, V08R07_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 *v08r07_sg_map(struct v08r07_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 %zd isn't a multiple of block size %zd\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
> > + */
> > + v08r07_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 v08r07_sg_unmap(struct v08r07_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 v08r07_sg_advance(struct v08r07_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;
> > + v08r07_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 @ %u\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 */
> > + v08r07_blk_bounce(host, host->sg);
> > +
> > + return;
> > + }
> > +
> > + /* Finished current page or an SG segment */
> > + v08r07_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 v08r07_blk_read() or
> > + * v08r07_blk_write()
> > + */
> > + struct scatterlist *next = sg_next(host->sg);
> > +
> > + host->page_idx = 0;
> > +
> > + if (!next)
> > + host->wait = V08R07_WAIT_FOR_DATA_END;
> > + host->sg = next;
> > +
> > + if (WARN(next && sg_dma_len(next) % data->blksz,
> > + "SG size %zd isn't a multiple of block size %zd\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 v08r07_dma_release(struct v08r07_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 v08r07_dma_stop_unmap(struct v08r07_host *host)
> > +{
> > + struct mmc_data *data = host->mrq->data;
> > +
> > + if (!host->dma_active)
> > + return;
> > +
> > + v08r07_write(host, V08R07_CC_EXT_MODE, 0);
> > + host->dma_active = false;
> > +
> > + if (data->flags & MMC_DATA_READ)
> > + /* TODO: do we have to synchronise? */
> > + 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 v08r07_dma_complete(void *arg)
> > +{
> > + struct v08r07_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);
> > +
> > + v08r07_dma_stop_unmap(host);
> > + v08r07_wait_for_brwe(host, mrq->data->flags &
> > MMC_DATA_READ);
> > +}
> > +
> > +static int v08r07_dma_setup(struct v08r07_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 = v08r07_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;
> > + v08r07_dma_release(host);
> > + dev_warn(mmc_dev(host->mmc),
> > + "DMA failed: %d, falling back to PIO\n", ret);
> > + }
> > +
> > + return cookie;
> > +}
> > +
> > +static int v08r07_dma_start(struct v08r07_host *host)
> > +{
> > + if (!host->chan_rx || !host->chan_tx)
> > + return -ENODEV;
> > +
> > + if (host->mrq->data->flags & MMC_DATA_READ)
> > + return v08r07_dma_setup(host, host->chan_rx,
> > DMA_DEV_TO_MEM);
> > +
> > + return v08r07_dma_setup(host, host->chan_tx,
> > DMA_MEM_TO_DEV);
> > +}
> > +
> > +static void v08r07_dma_kill(struct v08r07_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 v08r07_dma_check_error(struct v08r07_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, v08r07_read(host,
> > V08R07_SD_INFO1));
> > +
> > + if (host->io_error) {
> > + data->error = v08r07_error_code(host);
> > + data->bytes_xfered = 0;
> > + v08r07_dma_kill(host);
> > + v08r07_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 & V08R07_SD_INFO1_RSP_END)
> > + dev_warn(mmc_dev(host->mmc), "Unexpected response
> > received!\n");
> > +}
> > +
> > +static void v08r07_dma_kick(struct v08r07_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 v08r07_dma_request(struct v08r07_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 + V08R07_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 v08r07_clk_set(struct v08r07_host *host, struct mmc_ios *ios)
> > +{
> > + unsigned long rate = ios->clock;
> > + u32 val;
> > + unsigned int i;
> > +
> > + for (i = 1000; i; i--) {
> > + if (v08r07_read(host, V08R07_SD_INFO2) &
> > V08R07_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 = v08r07_read(host, V08R07_SD_CLK_CTRL) & 0xff00;
> > +
> > + 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)
> > + v08r07_write(host, V08R07_SD_CLK_CTRL,
> > + val & ~V08R07_SD_CLK_CTRL_SCLKEN);
> > +
> > + if (!rate) {
> > + host->rate = 0;
> > + return;
> > + }
> > +
> > + v08r07_write(host, V08R07_SD_CLK_CTRL, val);
> > +
> > + if (host->imclk == rate || host->imclk == host->rate ||
> > + !(val & V08R07_SD_CLK_CTRL_SCLKEN))
> > + v08r07_write(host, V08R07_SD_CLK_CTRL,
> > + val | V08R07_SD_CLK_CTRL_SCLKEN);
> > +}
> > +
> > +static void v08r07_set_power(struct v08r07_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 v08r07_reset(struct v08r07_host *host)
> > +{
> > + int i;
> > +
> > + v08r07_write(host, V08R07_SOFT_RST, 6);
> > + cpu_relax();
> > + v08r07_write(host, V08R07_SOFT_RST, 7);
> > + for (i = 1000; i; i--)
> > + if (v08r07_read(host, V08R07_SOFT_RST) & 1)
> > + break;
> > +
> > + return i ? 0 : -ETIMEDOUT;
> > +}
> > +
> > +static void v08r07_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
> > +{
> > + struct v08r07_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:
> > + v08r07_set_power(host, ios);
> > + v08r07_only_cd(host);
> > + break;
> > + case MMC_POWER_UP:
> > + /*
> > + * We only also touch V08R07_SD_OPTION from .request(),
> > which
> > + * cannot race with MMC_POWER_UP
> > + */
> > + ret = v08r07_reset(host);
> > + if (ret < 0) {
> > + dev_err(mmc_dev(mmc), "Cannot reset the
> > interface!\n");
> > + } else {
> > + v08r07_set_power(host, ios);
> > + v08r07_only_cd(host);
> > + }
> > + break;
> > + case MMC_POWER_ON:
> > + option = v08r07_read(host, V08R07_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 |= 0x8000;
> > + mode = 0;
> > + } else {
> > + option &= 0x7fff;
> > + mode = ios->timing == MMC_TIMING_UHS_DDR50;
> > + }
> > + v08r07_write(host, V08R07_SD_OPTION, option);
> > + v08r07_write(host, V08R07_SDIF_MODE, mode);
> > + break;
> > + }
> > +
> > + if (host->rate != ios->clock)
> > + v08r07_clk_set(host, ios);
> > +}
> > +
> > +/* This is data timeout. Response timeout is fixed to 640 clock cycles */
> > +static void v08r07_timeout_set(struct v08r07_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);
> > +
> > + v08r07_write(host, V08R07_SD_OPTION, (val << 4) |
> > + (v08r07_read(host, V08R07_SD_OPTION) & 0xff0f));
> > +}
> > +
> > +static void v08r07_request_done(struct v08r07_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%x %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))
> > + v08r07_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 */
> > + v08r07_write(host, V08R07_CC_EXT_MODE, 0);
> > + host->wait = V08R07_WAIT_FOR_REQUEST;
> > + host->mrq = NULL;
> > +
> > + mmc_request_done(host->mmc, mrq);
> > +}
> > +
> > +static int v08r07_cmd_flags(struct v08r07_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 |= V08R07_SD_CMD_APP;
> > + }
> > +
> > + if (mrq->data) {
> > + opc |= V08R07_SD_CMD_DATA;
> > +
> > + if (mrq->data->flags & MMC_DATA_READ)
> > + opc |= V08R07_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 |= V08R07_SD_CMD_MULTI;
> > + if (!mrq->stop)
> > + opc |=
> > V08R07_SD_CMD_CMD12_AUTO_OFF;
> > + }
> > +
> > + switch (mmc_resp_type(cmd)) {
> > + case MMC_RSP_NONE:
> > + opc |= V08R07_SD_CMD_MODE_RSP_NONE;
> > + break;
> > + case MMC_RSP_R1:
> > + opc |= V08R07_SD_CMD_MODE_RSP_R1;
> > + break;
> > + case MMC_RSP_R1B:
> > + opc |= V08R07_SD_CMD_MODE_RSP_R1B;
> > + break;
> > + case MMC_RSP_R2:
> > + opc |= V08R07_SD_CMD_MODE_RSP_R2;
> > + break;
> > + case MMC_RSP_R3:
> > + opc |= V08R07_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 v08r07_rq_start(struct v08r07_host *host)
> > +{
> > + struct mmc_request *mrq = host->mrq;
> > + struct mmc_command *cmd = mrq->cmd;
> > + struct mmc_data *data = mrq->data;
> > + int opc = v08r07_cmd_flags(host);
> > + int i;
> > +
> > + if (opc < 0)
> > + return opc;
> > +
> > + for (i = 1000; i; i--) {
> > + if (!(v08r07_read(host, V08R07_SD_INFO2) &
> > V08R07_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))
> > + v08r07_sg_prep(host);
> > +
> > + v08r07_write(host, V08R07_SD_SIZE, data->blksz);
> > +
> > + if ((data->blksz >= V08R07_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 V08R07_MIN_DMA bytes or more */
> > + use_dma = data->blksz >= V08R07_MIN_DMA &&
> > + !(data->blksz % 4) &&
> > + v08r07_dma_start(host) >= DMA_MIN_COOKIE;
> > +
> > + if (use_dma)
> > + v08r07_write(host, V08R07_CC_EXT_MODE,
> > V08R07_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 */
> > + v08r07_wait_for_resp(host);
> > +
> > + host->wait = V08R07_WAIT_FOR_CMD;
> > + schedule_delayed_work(&host->timeout_work, host->timeout * 4);
> > +
> > + /* SEC bit is required to enable block counting by the core */
> > + v08r07_write(host, V08R07_SD_STOP,
> > + data && data->blocks > 1 ? V08R07_SD_STOP_SEC : 0);
> > + v08r07_write(host, V08R07_SD_ARG, cmd->arg);
> > +
> > + /* Kick command execution */
> > + v08r07_write(host, V08R07_SD_CMD, opc);
> > +
> > + return 0;
> > +}
> > +
> > +static void v08r07_request(struct mmc_host *mmc, struct mmc_request
> > *mrq)
> > +{
> > + struct v08r07_host *host = mmc_priv(mmc);
> > + int ret;
> > +
> > + cancel_delayed_work_sync(&host->timeout_work);
> > +
> > + host->mrq = mrq;
> > + host->sg = NULL;
> > +
> > + v08r07_timeout_set(host);
> > + ret = v08r07_rq_start(host);
> > + if (ret < 0) {
> > + mrq->cmd->error = ret;
> > + v08r07_request_done(host);
> > + }
> > +}
> > +
> > +static int v08r07_get_cd(struct mmc_host *mmc)
> > +{
> > + struct v08r07_host *host = mmc_priv(mmc);
> > + /* Read is atomic, no need to lock */
> > + u32 status = v08r07_read(host, V08R07_SD_INFO1) &
> > V08R07_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 v08r07_get_ro(struct mmc_host *mmc)
> > +{
> > + struct v08r07_host *host = mmc_priv(mmc);
> > + /* No locking as above */
> > + u32 status = v08r07_read(host, V08R07_SD_INFO1) &
> > V08R07_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 v08r07_enable_sdio_irq(struct mmc_host *mmc, int enable)
> > +{
> > + struct v08r07_host *host = mmc_priv(mmc);
> > +
> > + dev_dbg(mmc_dev(mmc), "%s(): %sable\n", __func__, enable ?
> > "en" : "dis");
> > +
> > + if (enable) {
> > + host->sdio_mask = V08R07_SDIO_INFO1_IRQ &
> > ~V08R07_SDIO_INFO1_IOIRQ;
> > + v08r07_write(host, V08R07_SDIO_INFO1_MASK, host-
> > >sdio_mask);
> > + v08r07_write(host, V08R07_SDIO_MODE, 1);
> > + } else {
> > + v08r07_write(host, V08R07_SDIO_MODE, 0);
> > + v08r07_write(host, V08R07_SDIO_INFO1_MASK,
> > V08R07_SDIO_INFO1_IRQ);
> > + host->sdio_mask = V08R07_SDIO_INFO1_IRQ;
> > + }
> > +}
> > +
> > +static struct mmc_host_ops v08r07_ops = {
> > + .request = v08r07_request,
> > + .set_ios = v08r07_set_ios,
> > + .get_cd = v08r07_get_cd,
> > + .get_ro = v08r07_get_ro,
> > + .enable_sdio_irq = v08r07_enable_sdio_irq,
> > +};
> > +
> > +/* State machine handlers
> > */
> > +
> > +static void v08r07_resp_cmd12(struct v08r07_host *host)
> > +{
> > + struct mmc_command *cmd = host->mrq->stop;
> > + cmd->resp[0] = v08r07_read(host, V08R07_SD_RSP10);
> > +}
> > +
> > +static void v08r07_resp_read(struct v08r07_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 & V08R07_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 = v08r07_read(host, V08R07_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] = v08r07_read(host, V08R07_SD_RSP54);
> > + else
> > + rsp[0] = v08r07_read(host, V08R07_SD_RSP10);
> > +
> > + dev_dbg(mmc_dev(host->mmc), "Response 0x%x\n", rsp[0]);
> > +}
> > +
> > +static int v08r07_blk_read(struct v08r07_host *host)
> > +{
> > + struct mmc_data *data = host->mrq->data;
> > + u32 *p;
> > + int i, rest;
> > +
> > + if (host->io_error) {
> > + data->error = v08r07_error_code(host);
> > + goto error;
> > + }
> > +
> > + if (host->pg.page) {
> > + p = host->blk_page + host->offset;
> > + } else {
> > + p = v08r07_sg_map(host);
> > + if (!p) {
> > + data->error = -ENOMEM;
> > + goto error;
> > + }
> > + }
> > +
> > + for (i = 0; i < data->blksz / 4; i++, p++)
> > + *p = v08r07_read(host, V08R07_SD_BUF0);
> > +
> > + rest = data->blksz % 4;
> > + for (i = 0; i < (rest + 1) / 2; i++) {
> > + u16 d = v08r07_read16(host, V08R07_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 = V08R07_WAIT_FOR_REQUEST;
> > + return data->error;
> > +}
> > +
> > +static int v08r07_blk_write(struct v08r07_host *host)
> > +{
> > + struct mmc_data *data = host->mrq->data;
> > + u32 *p;
> > + int i, rest;
> > +
> > + if (host->io_error) {
> > + data->error = v08r07_error_code(host);
> > + goto error;
> > + }
> > +
> > + if (host->pg.page) {
> > + p = host->blk_page + host->offset;
> > + } else {
> > + p = v08r07_sg_map(host);
> > + if (!p) {
> > + data->error = -ENOMEM;
> > + goto error;
> > + }
> > + }
> > +
> > + for (i = 0; i < data->blksz / 4; i++, p++)
> > + v08r07_write(host, V08R07_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;
> > + v08r07_write16(host, V08R07_SD_BUF0, d);
> > + }
> > +
> > + return 0;
> > +
> > +error:
> > + dev_dbg(mmc_dev(host->mmc), "%s(): %d\n", __func__, data-
> > >error);
> > + host->wait = V08R07_WAIT_FOR_REQUEST;
> > + return data->error;
> > +}
> > +
> > +static int v08r07_stop_cmd(struct v08r07_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 = V08R07_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 v08r07_end_cmd(struct v08r07_host *host)
> > +{
> > + struct mmc_request *mrq = host->mrq;
> > + struct mmc_command *cmd = mrq->cmd;
> > +
> > + if (host->io_error) {
> > + cmd->error = v08r07_error_code(host);
> > + return false;
> > + }
> > +
> > + v08r07_resp_read(host);
> > +
> > + if (!mrq->data)
> > + return false;
> > +
> > + if (host->dma_active) {
> > + v08r07_dma_kick(host);
> > + if (!mrq->stop)
> > + host->wait = V08R07_WAIT_FOR_DMA;
> > + else if (v08r07_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 = V08R07_WAIT_FOR_MREAD;
> > + else
> > + host->wait = V08R07_WAIT_FOR_READ;
> > + } else {
> > + if (cmd->opcode == MMC_WRITE_MULTIPLE_BLOCK ||
> > + (cmd->opcode == SD_IO_RW_EXTENDED &&
> > + mrq->data->blocks > 1))
> > + host->wait = V08R07_WAIT_FOR_MWRITE;
> > + else
> > + host->wait = V08R07_WAIT_FOR_WRITE;
> > + }
> > +
> > + return true;
> > +}
> > +
> > +static bool v08r07_read_block(struct v08r07_host *host)
> > +{
> > + /* ACCESS_END IRQ is already unmasked */
> > + int ret = v08r07_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.
> > + */
> > + v08r07_sg_unmap(host, true);
> > +
> > + if (ret < 0)
> > + return false;
> > +
> > + host->wait = V08R07_WAIT_FOR_DATA_END;
> > + return true;
> > +}
> > +
> > +static bool v08r07_mread_block(struct v08r07_host *host)
> > +{
> > + int ret = v08r07_blk_read(host);
> > +
> > + if (ret < 0)
> > + return false;
> > +
> > + v08r07_sg_advance(host);
> > +
> > + return !host->mrq->data->error &&
> > + (host->wait != V08R07_WAIT_FOR_DATA_END || !host-
> > >mrq->stop);
> > +}
> > +
> > +static bool v08r07_write_block(struct v08r07_host *host)
> > +{
> > + int ret = v08r07_blk_write(host);
> > +
> > + /* See comment in v08r07_read_block() */
> > + v08r07_sg_unmap(host, true);
> > +
> > + if (ret < 0)
> > + return false;
> > +
> > + host->wait = V08R07_WAIT_FOR_DATA_END;
> > + return true;
> > +}
> > +
> > +static bool v08r07_mwrite_block(struct v08r07_host *host)
> > +{
> > + int ret = v08r07_blk_write(host);
> > +
> > + if (ret < 0)
> > + return false;
> > +
> > + v08r07_sg_advance(host);
> > +
> > + return !host->mrq->data->error &&
> > + (host->wait != V08R07_WAIT_FOR_DATA_END || !host-
> > >mrq->stop);
> > +}
> > +
> > +/* Interrupt & timeout handlers */
> > +
> > +static irqreturn_t v08r07_sd_bh(int irq, void *dev_id)
> > +{
> > + struct v08r07_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 V08R07_WAIT_FOR_REQUEST:
> > + /* We're too late, the timeout has already kicked in */
> > + return IRQ_HANDLED;
> > + case V08R07_WAIT_FOR_CMD:
> > + /* Wait for data? */
> > + io_wait = v08r07_end_cmd(host);
> > + break;
> > + case V08R07_WAIT_FOR_MREAD:
> > + /* Wait for more data? */
> > + io_wait = v08r07_mread_block(host);
> > + break;
> > + case V08R07_WAIT_FOR_READ:
> > + /* Wait for data end? */
> > + io_wait = v08r07_read_block(host);
> > + break;
> > + case V08R07_WAIT_FOR_MWRITE:
> > + /* Wait data to write? */
> > + io_wait = v08r07_mwrite_block(host);
> > + break;
> > + case V08R07_WAIT_FOR_WRITE:
> > + /* Wait for data end? */
> > + io_wait = v08r07_write_block(host);
> > + break;
> > + case V08R07_WAIT_FOR_DMA:
> > + v08r07_dma_check_error(host);
> > + break;
> > + case V08R07_WAIT_FOR_STOP:
> > + v08r07_write(host, V08R07_SD_STOP, 0);
> > + if (host->io_error) {
> > + int ret = v08r07_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;
> > + }
> > + v08r07_resp_cmd12(host);
> > + mrq->stop->error = 0;
> > + break;
> > + case V08R07_WAIT_FOR_DATA_END:
> > + if (host->io_error) {
> > + mrq->data->error = v08r07_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);
> > + v08r07_request_done(host);
> > + return IRQ_HANDLED;
> > + }
> > +
> > + if (io_wait) {
> > + schedule_delayed_work(&host->timeout_work, host-
> > >timeout * 4);
> > + /* Wait for more data or ACCESS_END */
> > + if (!host->dma_active)
> > + v08r07_wait_for_brwe(host, mrq->data->flags &
> > MMC_DATA_READ);
> > + return IRQ_HANDLED;
> > + }
> > +
> > + if (!cmd->error) {
> > + if (data) {
> > + if (!data->error) {
> > + if (host->wait != V08R07_WAIT_FOR_STOP
> > &&
> > + host->mrq->stop &&
> > + !host->mrq->stop->error &&
> > + !v08r07_stop_cmd(host)) {
> > + /* Sending STOP */
> > + v08r07_wait_for_resp(host);
> > +
> > + schedule_delayed_work(&host-
> > >timeout_work,
> > + host->timeout *
> > 4);
> > +
> > + 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);
> > + v08r07_sg_unmap(host, true);
> > + }
> > + } else if (cmd->opcode == MMC_APP_CMD) {
> > + host->app_cmd = true;
> > + }
> > + }
> > +
> > + v08r07_request_done(host);
> > +
> > + return IRQ_HANDLED;
> > +}
> > +
> > +static irqreturn_t v08r07_sd(int irq, void *dev_id)
> > +{
> > + struct v08r07_host *host = dev_id;
> > + u16 status, status2, error;
> > +
> > + status = v08r07_read(host, V08R07_SD_INFO1) & ~host-
> > >status_mask &
> > + ~V08R07_SD_INFO1_CARD;
> > + status2 = v08r07_read(host, V08R07_SD_INFO2) & ~host-
> > >status2_mask;
> > +
> > + v08r07_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 & V08R07_SD_INFO2_ERR;
> > +
> > + /* Ack / clear interrupts */
> > + if (V08R07_SD_INFO1_IRQ & status)
> > + v08r07_write(host, V08R07_SD_INFO1,
> > + 0xffff & ~(V08R07_SD_INFO1_IRQ & status));
> > +
> > + if (V08R07_SD_INFO2_IRQ & status2) {
> > + if (error)
> > + /* In error cases BWE and BRE aren't cleared
> > automatically */
> > + status2 |= V08R07_SD_INFO2_BWE |
> > V08R07_SD_INFO2_BRE;
> > +
> > + v08r07_write(host, V08R07_SD_INFO2,
> > + 0xffff & ~(V08R07_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 != V08R07_WAIT_FOR_CMD ||
> > + error != V08R07_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 v08r07_sdio(int irq, void *dev_id)
> > +{
> > + struct v08r07_host *host = dev_id;
> > + u32 status = v08r07_read(host, V08R07_SDIO_INFO1) & ~host-
> > >sdio_mask;
> > +
> > + dev_dbg(mmc_dev(host->mmc), "%s(): status 0x%x\n", __func__,
> > status);
> > +
> > + if (!status)
> > + return IRQ_NONE;
> > +
> > + v08r07_write(host, V08R07_SDIO_INFO1, ~status);
> > +
> > + mmc_signal_sdio_irq(host->mmc);
> > +
> > + return IRQ_HANDLED;
> > +}
> > +
> > +static irqreturn_t v08r07_cd(int irq, void *dev_id)
> > +{
> > + struct v08r07_host *host = dev_id;
> > + struct mmc_host *mmc = host->mmc;
> > + u16 status;
> > +
> > + /* We're only interested in hotplug events here */
> > + status = v08r07_read(host, V08R07_SD_INFO1) & ~host-
> > >status_mask &
> > + V08R07_SD_INFO1_CARD;
> > +
> > + if (!status)
> > + return IRQ_NONE;
> > +
> > + /* Ack */
> > + v08r07_write(host, V08R07_SD_INFO1, !status);
> > +
> > + if (!work_pending(&mmc->detect.work) &&
> > + (((status & V08R07_SD_INFO1_CARD_INSERT) &&
> > + !mmc->card) ||
> > + ((status & V08R07_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 v08r07_timeout_work(struct work_struct *work)
> > +{
> > + struct delayed_work *d = container_of(work, struct delayed_work,
> > work);
> > + struct v08r07_host *host = container_of(d, struct v08r07_host,
> > timeout_work);
> > + struct mmc_request *mrq = host->mrq;
> > + struct mmc_data *data = mrq ? mrq->data : NULL;
> > +
> > + 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,
> > + v08r07_read(host, V08R07_SD_INFO1),
> > + v08r07_read(host, V08R07_SD_INFO2), host->irq_status);
> > +
> > + if (host->dma_active) {
> > + v08r07_dma_kill(host);
> > + v08r07_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 V08R07_WAIT_FOR_CMD:
> > + v08r07_error_code(host);
> > + if (mrq)
> > + mrq->cmd->error = -ETIMEDOUT;
> > + break;
> > + case V08R07_WAIT_FOR_STOP:
> > + v08r07_error_code(host);
> > + mrq->stop->error = -ETIMEDOUT;
> > + break;
> > + case V08R07_WAIT_FOR_DMA:
> > + case V08R07_WAIT_FOR_MREAD:
> > + case V08R07_WAIT_FOR_MWRITE:
> > + case V08R07_WAIT_FOR_READ:
> > + case V08R07_WAIT_FOR_WRITE:
> > + dev_dbg(mmc_dev(host->mmc),
> > + "%c: page #%u @ +0x%x %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(host->sg), host->sg->offset);
> > + v08r07_sg_unmap(host, true);
> > + /*
> > + * If V08R07_WAIT_FOR_DATA_END times out, we have
> > already unmapped
> > + * the page
> > + */
> > + case V08R07_WAIT_FOR_DATA_END:
> > + v08r07_error_code(host);
> > + data->error = -ETIMEDOUT;
> > + }
> > +
> > + if (mrq)
> > + v08r07_request_done(host);
> > +}
> > +
> > +/* Probe / release */
> > +
> > +static const struct of_device_id v08r07_of_match[] = {
> > + {.compatible = "renesas,usdhi6rol0"},
> > + {.compatible = "renesas,v08r07s01e"},
> > + {}
> > +};
> > +MODULE_DEVICE_TABLE(of, v08r07_of_match);
> > +
> > +static int v08r07_probe(struct platform_device *pdev)
> > +{
> > + struct device *dev = &pdev->dev;
> > + struct mmc_host *mmc;
> > + struct v08r07_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 v08r07_host), dev);
> > + if (!mmc)
> > + return -ENOMEM;
> > +
> > + ret = mmc_of_parse(mmc);
> > + if (ret < 0)
> > + goto e_free_mmc;
> > +
> > + mmc_regulator_get_supply(mmc);
> > +
> > + host = mmc_priv(mmc);
> > + host->mmc = mmc;
> > + host->wait = V08R07_WAIT_FOR_REQUEST;
> > + host->timeout = msecs_to_jiffies(1000);
> > +
> > + 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))
> > + 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 = v08r07_read(host, V08R07_VERSION);
> > + if ((version & 0xfff) != 0xa0d) {
> > + dev_err(dev, "Version not recognized %x\n", version);
> > + goto e_clk_off;
> > + }
> > +
> > + dev_info(dev, "A V08R07S01E SD host detected with %d ports\n",
> > + v08r07_read(host, V08R07_SD_PORT_SEL) >> 8);
> > +
> > + v08r07_mask_all(host);
> > +
> > + if (irq_cd >= 0) {
> > + ret = devm_request_irq(dev, irq_cd, v08r07_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, v08r07_sd,
> > v08r07_sd_bh, 0,
> > + dev_name(dev), host);
> > + if (ret < 0)
> > + goto e_clk_off;
> > +
> > + ret = devm_request_irq(dev, irq_sdio, v08r07_sdio, 0,
> > + dev_name(dev), host);
> > + if (ret < 0)
> > + goto e_clk_off;
> > +
> > + INIT_DELAYED_WORK(&host->timeout_work,
> > v08r07_timeout_work);
> > +
> > + v08r07_dma_request(host, res->start);
> > +
> > + mmc->ops = &v08r07_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 v08r07_remove(struct platform_device *pdev)
> > +{
> > + struct v08r07_host *host = platform_get_drvdata(pdev);
> > +
> > + mmc_remove_host(host->mmc);
> > +
> > + v08r07_mask_all(host);
> > + cancel_delayed_work_sync(&host->timeout_work);
> > + v08r07_dma_release(host);
> > + clk_disable_unprepare(host->clk);
> > + mmc_free_host(host->mmc);
> > +
> > + return 0;
> > +}
> > +
> > +static struct platform_driver v08r07_driver = {
> > + .probe = v08r07_probe,
> > + .remove = v08r07_remove,
> > + .driver = {
> > + .name = "v08r07s01e",
> > + .owner = THIS_MODULE,
> > + .of_match_table = v08r07_of_match,
> > + },
> > +};
> > +
> > +module_platform_driver(v08r07_driver);
> > +
> > +MODULE_DESCRIPTION("Renesas v08r07s01e SD/SDIO host driver");
> > +MODULE_LICENSE("GPL v2");
> > +MODULE_ALIAS("platform:v08r07s01e");
> > +MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@xxxxxx>");
> > --
> > 1.9.1
> >
> > --
> > To unsubscribe from this list: send the line "unsubscribe linux-mmc" in
> > the body of a message to majordomo@xxxxxxxxxxxxxxx
> > More majordomo info at http://vger.kernel.org/majordomo-info.html
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