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Message-ID: <4A40F0C5.9030308@qq.com>
Date: Tue, 23 Jun 2009 23:12:05 +0800
From: taco <tacoee@...il.com>
To: Vipin <vipin.bhandari@...com>
CC: linux-kernel@...r.kernel.org,
davinci-linux-open-source@...ux.davincidsp.com,
drzeus-mmc@...eus.cx
Subject: Re: [PATCH] DaVinci: MMC: V5: MMC/SD controller driver for DaVinci
family.
Vipin wrote:
> The description of this patch needs to be updated. I'll repost the patch
> soon.
>
> Thanks and regards,
> ~Vipin
>
>
>
>> -----Original Message-----
>> From: Vipin Bhandari [mailto:vipin.bhandari@...com]
>> Sent: Tuesday, June 23, 2009 2:25 PM
>> To: linux-kernel@...r.kernel.org
>> Cc: davinci-linux-open-source@...ux.davincidsp.com; drzeus-
>> mmc@...eus.cx; Vipin Bhandari; Purshotam Kumar
>> Subject: [PATCH] DaVinci: MMC: V5: MMC/SD controller driver for DaVinci
>> family.
>>
>> This patch adds support for MMC/SD controller driver for DaVinci family
>> SoC.
>> This patch will work for SoC like DM6446 and DM355. SoC like DM365 and
>> DA830 also has same controller with small variations and could
>> supported/added
>> easily by using this version of patch. It means that this version of
>> patch
>> could be used for all SoC which has been derived from DaVinci family.
>>
>> This patch has been generated against latest 2.6.30 mainline kernel.
>> This patch
>> will not compile currently because it depends notably on the EDMA
>> utilities and
>> chip/board setup, that will come at some point through the ARM tree.
>> Please use
>> currently DaVinci GIT tree for EDMA utilities and chip/board setup etc.
>>
>> The scatterlist traversal is made proper. The also has some minor
>> comments
>> modification and also sets the value written to the DAVINCI_MMCTOR
>> register
>> properly. The timeout calculation is made proper by deriving it from
>> the clock
>> values.
>>
>> Many thanks to David Brownell (david-b@...bell.net) for all his
>> support.
>>
>> This updated patch incorporates most of review comments given by Pierre
>> Ossman.
>> Many thanks for Pierre Ossman for reviewing.
>>
>> Signed-off-by: Vipin Bhandari <vipin.bhandari@...com>
>> Signed-off-by: Purshotam Kumar <purushotam@...com>
>> Acked-by: David Brownell <dbrownell@...rs.sourceforge.net>
>> ---
>> drivers/mmc/host/Kconfig | 8 +
>> drivers/mmc/host/Makefile | 1 +
>> drivers/mmc/host/davinci_mmc.c | 1281
>> ++++++++++++++++++++++++++++++++++++++++
>> 3 files changed, 1290 insertions(+), 0 deletions(-)
>> create mode 100644 drivers/mmc/host/davinci_mmc.c
>>
>> diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
>> index 891ef18..b5adcba 100644
>> --- a/drivers/mmc/host/Kconfig
>> +++ b/drivers/mmc/host/Kconfig
>> @@ -236,6 +236,14 @@ config MMC_MVSDIO
>> To compile this driver as a module, choose M here: the
>> module will be called mvsdio.
>>
>> +config MMC_DAVINCI
>> + tristate "TI DAVINCI Multimedia Card Interface support"
>> + depends on ARCH_DAVINCI
>> + help
>> + This selects the TI DAVINCI Multimedia card Interface.
>> + If you have an DAVINCI board with a Multimedia Card slot,
>> + say Y or M here. If unsure, say N.
>> +
>> config MMC_SPI
>> tristate "MMC/SD/SDIO over SPI"
>> depends on SPI_MASTER && !HIGHMEM && HAS_DMA
>> diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
>> index cf153f6..784bde1 100644
>> --- a/drivers/mmc/host/Makefile
>> +++ b/drivers/mmc/host/Makefile
>> @@ -24,6 +24,7 @@ obj-$(CONFIG_MMC_AT91) += at91_mci.o
>> obj-$(CONFIG_MMC_ATMELMCI) += atmel-mci.o
>> obj-$(CONFIG_MMC_TIFM_SD) += tifm_sd.o
>> obj-$(CONFIG_MMC_MVSDIO) += mvsdio.o
>> +obj-$(CONFIG_MMC_DAVINCI) += davinci_mmc.o
>> obj-$(CONFIG_MMC_SPI) += mmc_spi.o
>> ifeq ($(CONFIG_OF),y)
>> obj-$(CONFIG_MMC_SPI) += of_mmc_spi.o
>> diff --git a/drivers/mmc/host/davinci_mmc.c
>> b/drivers/mmc/host/davinci_mmc.c
>> new file mode 100644
>> index 0000000..5caa542
>> --- /dev/null
>> +++ b/drivers/mmc/host/davinci_mmc.c
>> @@ -0,0 +1,1281 @@
>> +/*
>> + * davinci_mmc.c - TI DaVinci MMC/SD/SDIO driver
>> + *
>> + * Copyright (C) 2006 Texas Instruments.
>> + * Original author: Purushotam Kumar
>> + * Copyright (C) 2009 David Brownell
>> + *
>> + * This program is free software; you can redistribute it and/or
>> modify
>> + * it under the terms of the GNU General Public License as published
>> by
>> + * the Free Software Foundation; either version 2 of the License, or
>> + * (at your option) any later version.
>> + *
>> + * This program is distributed in the hope that it will be useful,
>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
>> + * GNU General Public License for more details.
>> + *
>> + * You should have received a copy of the GNU General Public License
>> + * along with this program; if not, write to the Free Software
>> + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
>> + */
>> +
>> +#include <linux/module.h>
>> +#include <linux/ioport.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/clk.h>
>> +#include <linux/err.h>
>> +#include <linux/mmc/host.h>
>> +#include <linux/io.h>
>> +#include <linux/irq.h>
>> +#include <linux/delay.h>
>> +#include <linux/dma-mapping.h>
>> +#include <linux/mmc/mmc.h>
>> +
>> +#include <mach/mmc.h>
>> +#include <mach/edma.h>
>> +
>> +/*
>> + * Register Definitions
>> + */
>> +#define DAVINCI_MMCCTL 0x00 /* Control Register
>> */
>> +#define DAVINCI_MMCCLK 0x04 /* Memory Clock Control Register
>> */
>> +#define DAVINCI_MMCST0 0x08 /* Status Register 0
>> */
>> +#define DAVINCI_MMCST1 0x0C /* Status Register 1
>> */
>> +#define DAVINCI_MMCIM 0x10 /* Interrupt Mask Register
>> */
>> +#define DAVINCI_MMCTOR 0x14 /* Response Time-Out Register
>> */
>> +#define DAVINCI_MMCTOD 0x18 /* Data Read Time-Out Register
>> */
>> +#define DAVINCI_MMCBLEN 0x1C /* Block Length Register
>> */
>> +#define DAVINCI_MMCNBLK 0x20 /* Number of Blocks Register
>> */
>> +#define DAVINCI_MMCNBLC 0x24 /* Number of Blocks Counter Register
>> */
>> +#define DAVINCI_MMCDRR 0x28 /* Data Receive Register
>> */
>> +#define DAVINCI_MMCDXR 0x2C /* Data Transmit Register
>> */
>> +#define DAVINCI_MMCCMD 0x30 /* Command Register
>> */
>> +#define DAVINCI_MMCARGHL 0x34 /* Argument Register
>> */
>> +#define DAVINCI_MMCRSP01 0x38 /* Response Register 0 and 1
>> */
>> +#define DAVINCI_MMCRSP23 0x3C /* Response Register 0 and 1
>> */
>> +#define DAVINCI_MMCRSP45 0x40 /* Response Register 0 and 1
>> */
>> +#define DAVINCI_MMCRSP67 0x44 /* Response Register 0 and 1
>> */
>> +#define DAVINCI_MMCDRSP 0x48 /* Data Response Register
>> */
>> +#define DAVINCI_MMCETOK 0x4C
>> +#define DAVINCI_MMCCIDX 0x50 /* Command Index Register
>> */
>> +#define DAVINCI_MMCCKC 0x54
>> +#define DAVINCI_MMCTORC 0x58
>> +#define DAVINCI_MMCTODC 0x5C
>> +#define DAVINCI_MMCBLNC 0x60
>> +#define DAVINCI_SDIOCTL 0x64
>> +#define DAVINCI_SDIOST0 0x68
>> +#define DAVINCI_SDIOEN 0x6C
>> +#define DAVINCI_SDIOST 0x70
>> +#define DAVINCI_MMCFIFOCTL 0x74 /* FIFO Control Register
>> */
>> +
>> +/* DAVINCI_MMCCTL definitions */
>> +#define MMCCTL_DATRST (1 << 0)
>> +#define MMCCTL_CMDRST (1 << 1)
>> +#define MMCCTL_WIDTH_4_BIT (1 << 2)
>> +#define MMCCTL_DATEG_DISABLED (0 << 6)
>> +#define MMCCTL_DATEG_RISING (1 << 6)
>> +#define MMCCTL_DATEG_FALLING (2 << 6)
>> +#define MMCCTL_DATEG_BOTH (3 << 6)
>> +#define MMCCTL_PERMDR_LE (0 << 9)
>> +#define MMCCTL_PERMDR_BE (1 << 9)
>> +#define MMCCTL_PERMDX_LE (0 << 10)
>> +#define MMCCTL_PERMDX_BE (1 << 10)
>> +
>> +/* DAVINCI_MMCCLK definitions */
>> +#define MMCCLK_CLKEN (1 << 8)
>> +#define MMCCLK_CLKRT_MASK (0xFF << 0)
>> +
>> +/* IRQ bit definitions, for DAVINCI_MMCST0 and DAVINCI_MMCIM */
>> +#define MMCST0_DATDNE BIT(0) /* data done */
>> +#define MMCST0_BSYDNE BIT(1) /* busy done */
>> +#define MMCST0_RSPDNE BIT(2) /* command done */
>> +#define MMCST0_TOUTRD BIT(3) /* data read timeout */
>> +#define MMCST0_TOUTRS BIT(4) /* command response timeout
>> */
>> +#define MMCST0_CRCWR BIT(5) /* data write CRC error */
>> +#define MMCST0_CRCRD BIT(6) /* data read CRC error */
>> +#define MMCST0_CRCRS BIT(7) /* command response CRC error
>> */
>> +#define MMCST0_DXRDY BIT(9) /* data transmit ready (fifo
>> empty) */
>> +#define MMCST0_DRRDY BIT(10) /* data receive ready (data
>> in fifo)*/
>> +#define MMCST0_DATED BIT(11) /* DAT3 edge detect */
>> +#define MMCST0_TRNDNE BIT(12) /* transfer done */
>> +
>> +/* DAVINCI_MMCST1 definitions */
>> +#define MMCST1_BUSY (1 << 0)
>> +
>> +/* DAVINCI_MMCCMD definitions */
>> +#define MMCCMD_CMD_MASK (0x3F << 0)
>> +#define MMCCMD_PPLEN (1 << 7)
>> +#define MMCCMD_BSYEXP (1 << 8)
>> +#define MMCCMD_RSPFMT_MASK (3 << 9)
>> +#define MMCCMD_RSPFMT_NONE (0 << 9)
>> +#define MMCCMD_RSPFMT_R1456 (1 << 9)
>> +#define MMCCMD_RSPFMT_R2 (2 << 9)
>> +#define MMCCMD_RSPFMT_R3 (3 << 9)
>> +#define MMCCMD_DTRW (1 << 11)
>> +#define MMCCMD_STRMTP (1 << 12)
>> +#define MMCCMD_WDATX (1 << 13)
>> +#define MMCCMD_INITCK (1 << 14)
>> +#define MMCCMD_DCLR (1 << 15)
>> +#define MMCCMD_DMATRIG (1 << 16)
>> +
>> +/* DAVINCI_MMCFIFOCTL definitions */
>> +#define MMCFIFOCTL_FIFORST (1 << 0)
>> +#define MMCFIFOCTL_FIFODIR_WR (1 << 1)
>> +#define MMCFIFOCTL_FIFODIR_RD (0 << 1)
>> +#define MMCFIFOCTL_FIFOLEV (1 << 2) /* 0 = 128 bits, 1 = 256 bits
>> */
>> +#define MMCFIFOCTL_ACCWD_4 (0 << 3) /* access width of 4 bytes
>> */
>> +#define MMCFIFOCTL_ACCWD_3 (1 << 3) /* access width of 3 bytes
>> */
>> +#define MMCFIFOCTL_ACCWD_2 (2 << 3) /* access width of 2 bytes
>> */
>> +#define MMCFIFOCTL_ACCWD_1 (3 << 3) /* access width of 1 byte
>> */
>> +
>> +
>> +/* MMCSD Init clock in Hz in opendrain mode */
>> +#define MMCSD_INIT_CLOCK 200000
>> +
>> +/*
>> + * One scatterlist dma "segment" is at most MAX_CCNT rw_threshold
>> units,
>> + * and we handle up to NR_SG segments. MMC_BLOCK_BOUNCE kicks in only
>> + * for drivers with max_hw_segs == 1, making the segments bigger
>> (64KB)
>> + * than the page or two that's otherwise typical. NR_SG == 16 gives
>> at
>> + * least the same throughput boost, using EDMA transfer linkage
>> instead
>> + * of spending CPU time copying pages.
>> + */
>> +#define MAX_CCNT ((1 << 16) - 1)
>> +
>> +#define NR_SG 16
>> +
>> +static unsigned rw_threshold = 32;
>> +module_param(rw_threshold, uint, S_IRUGO);
>> +MODULE_PARM_DESC(rw_threshold,
>> + "Read/Write threshold. Default = 32");
>> +
>> +static unsigned __initdata use_dma = 1;
>> +module_param(use_dma, uint, 0);
>> +MODULE_PARM_DESC(use_dma, "Whether to use DMA or not. Default = 1");
>> +
>> +struct mmc_davinci_host {
>> + struct mmc_command *cmd;
>> + struct mmc_data *data;
>> + struct mmc_host *mmc;
>> + struct clk *clk;
>> + unsigned int mmc_input_clk;
>> + void __iomem *base;
>> + struct resource *mem_res;
>> + int irq;
>> + unsigned char bus_mode;
>> +
>> +#define DAVINCI_MMC_DATADIR_NONE 0
>> +#define DAVINCI_MMC_DATADIR_READ 1
>> +#define DAVINCI_MMC_DATADIR_WRITE 2
>> + unsigned char data_dir;
>> +
>> + /* buffer is used during PIO of one scatterlist segment, and
>> + * is updated along with buffer_bytes_left. bytes_left applies
>> + * to all N blocks of the PIO transfer.
>> + */
>> + u8 *buffer;
>> + u32 buffer_bytes_left;
>> + u32 bytes_left;
>> +
>> + u8 rxdma, txdma;
>> + bool use_dma;
>> + bool do_dma;
>> +
>> + /* Scatterlist DMA uses one or more parameter RAM entries:
>> + * the main one (associated with rxdma or txdma) plus zero or
>> + * more links. The entries for a given transfer differ only
>> + * by memory buffer (address, length) and link field.
>> + */
>> + struct edmacc_param tx_template;
>> + struct edmacc_param rx_template;
>> + unsigned n_link;
>> + u8 links[NR_SG - 1];
>> +
>> + /* For PIO we walk scatterlists one segment at a time. */
>> + unsigned int sg_len;
>> + struct scatterlist *sg;
>> +
>> + /* Version of the MMC/SD controller */
>> + u8 version;
>> + /* for ns in one cycle calculation */
>> + unsigned ns_in_one_cycle;
>> +};
>> +
>> +
>> +/* PIO only */
>> +static void mmc_davinci_sg_to_buf(struct mmc_davinci_host *host)
>> +{
>> + host->buffer_bytes_left = sg_dma_len(host->sg);
>> + host->buffer = sg_virt(host->sg);
>> + if (host->buffer_bytes_left > host->bytes_left)
>> + host->buffer_bytes_left = host->bytes_left;
>> +}
>> +
>> +static void davinci_fifo_data_trans(struct mmc_davinci_host *host,
>> + unsigned int n)
>> +{
>> + u8 *p;
>> + unsigned int i;
>> +
>> + if (host->buffer_bytes_left == 0) {
>> + host->sg = sg_next(host->data->sg);
>> + mmc_davinci_sg_to_buf(host);
>> + }
>> +
>> + p = host->buffer;
>> + if (n > host->buffer_bytes_left)
>> + n = host->buffer_bytes_left;
>> + host->buffer_bytes_left -= n;
>> + host->bytes_left -= n;
>> +
>> + /* NOTE: we never transfer more than rw_threshold bytes
>> + * to/from the fifo here; there's no I/O overlap.
>> + * This also assumes that access width( i.e. ACCWD) is 4 bytes
>> + */
>> + if (host->data_dir == DAVINCI_MMC_DATADIR_WRITE) {
>> + for (i = 0; i < (n >> 2); i++) {
>> + writel(*((u32 *)p), host->base + DAVINCI_MMCDXR);
>> + p = p + 4;
>> + }
>> + if (n & 3) {
>> + iowrite8_rep(host->base + DAVINCI_MMCDXR, p, (n &
>> 3));
>> + p = p + (n & 3);
>> + }
>> + } else {
>> + for (i = 0; i < (n >> 2); i++) {
>> + *((u32 *)p) = readl(host->base + DAVINCI_MMCDRR);
>> + p = p + 4;
>> + }
>> + if (n & 3) {
>> + ioread8_rep(host->base + DAVINCI_MMCDRR, p, (n &
>>
> 3));
>
>> + p = p + (n & 3);
>> + }
>> + }
>> + host->buffer = p;
>> +}
>> +
>> +static void mmc_davinci_start_command(struct mmc_davinci_host *host,
>> + struct mmc_command *cmd)
>> +{
>> + u32 cmd_reg = 0;
>> + u32 im_val;
>> +
>> + dev_dbg(mmc_dev(host->mmc), "CMD%d, arg 0x%08x%s\n",
>> + cmd->opcode, cmd->arg,
>> + ({ char *s;
>> + switch (mmc_resp_type(cmd)) {
>> + case MMC_RSP_R1:
>> + s = ", R1/R5/R6/R7 response";
>> + break;
>> + case MMC_RSP_R1B:
>> + s = ", R1b response";
>> + break;
>> + case MMC_RSP_R2:
>> + s = ", R2 response";
>> + break;
>> + case MMC_RSP_R3:
>> + s = ", R3/R4 response";
>> + break;
>> + default:
>> + s = ", (R? response)";
>> + break;
>> + }; s; }));
>> + host->cmd = cmd;
>> +
>> + switch (mmc_resp_type(cmd)) {
>> + case MMC_RSP_R1B:
>> + /* There's some spec confusion about when R1B is
>> + * allowed, but if the card doesn't issue a BUSY
>> + * then it's harmless for us to allow it.
>> + */
>> + cmd_reg |= MMCCMD_BSYEXP;
>> + /* FALLTHROUGH */
>> + case MMC_RSP_R1: /* 48 bits, CRC */
>> + cmd_reg |= MMCCMD_RSPFMT_R1456;
>> + break;
>> + case MMC_RSP_R2: /* 136 bits, CRC */
>> + cmd_reg |= MMCCMD_RSPFMT_R2;
>> + break;
>> + case MMC_RSP_R3: /* 48 bits, no CRC */
>> + cmd_reg |= MMCCMD_RSPFMT_R3;
>> + break;
>> + default:
>> + cmd_reg |= MMCCMD_RSPFMT_NONE;
>> + dev_dbg(mmc_dev(host->mmc), "unknown resp_type %04x\n",
>> + mmc_resp_type(cmd));
>> + break;
>> + }
>> +
>> + /* Set command index */
>> + cmd_reg |= cmd->opcode;
>> +
>> + /* Enable EDMA transfer triggers */
>> + if (host->do_dma)
>> + cmd_reg |= MMCCMD_DMATRIG;
>> +
>> + if (host->version == MMC_CTLR_VERSION_2 && host->data != NULL &&
>> + host->data_dir == DAVINCI_MMC_DATADIR_READ)
>> + cmd_reg |= MMCCMD_DMATRIG;
>> +
>> + /* Setting whether command involves data transfer or not */
>> + if (cmd->data)
>> + cmd_reg |= MMCCMD_WDATX;
>> +
>> + /* Setting whether stream or block transfer */
>> + if (cmd->flags & MMC_DATA_STREAM)
>> + cmd_reg |= MMCCMD_STRMTP;
>> +
>> + /* Setting whether data read or write */
>> + if (host->data_dir == DAVINCI_MMC_DATADIR_WRITE)
>> + cmd_reg |= MMCCMD_DTRW;
>> +
>> + if (host->bus_mode == MMC_BUSMODE_PUSHPULL)
>> + cmd_reg |= MMCCMD_PPLEN;
>> +
>> + /* set Command timeout */
>> + writel(0x1FFF, host->base + DAVINCI_MMCTOR);
>> +
>> + /* Enable interrupt (calculate here, defer until FIFO is
>> stuffed). */
>> + im_val = MMCST0_RSPDNE | MMCST0_CRCRS | MMCST0_TOUTRS;
>> + if (host->data_dir == DAVINCI_MMC_DATADIR_WRITE) {
>> + im_val |= MMCST0_DATDNE | MMCST0_CRCWR;
>> +
>> + if (!host->do_dma)
>> + im_val |= MMCST0_DXRDY;
>> + } else if (host->data_dir == DAVINCI_MMC_DATADIR_READ) {
>> + im_val |= MMCST0_DATDNE | MMCST0_CRCRD | MMCST0_TOUTRD;
>> +
>> + if (!host->do_dma)
>> + im_val |= MMCST0_DRRDY;
>> + }
>> +
>> + /*
>> + * Before non-DMA WRITE commands the controller needs priming:
>> + * FIFO should be populated with 32 bytes i.e. whatever is the
>> FIFO size
>> + */
>> + if (!host->do_dma && (host->data_dir ==
>> DAVINCI_MMC_DATADIR_WRITE))
>> + davinci_fifo_data_trans(host, rw_threshold);
>> +
>> + writel(cmd->arg, host->base + DAVINCI_MMCARGHL);
>> + writel(cmd_reg, host->base + DAVINCI_MMCCMD);
>> + writel(im_val, host->base + DAVINCI_MMCIM);
>> +}
>> +
>> +/*--------------------------------------------------------------------
>> --*/
>> +
>> +/* DMA infrastructure */
>> +
>> +static void davinci_abort_dma(struct mmc_davinci_host *host)
>> +{
>> + int sync_dev;
>> +
>> + if (host->data_dir == DAVINCI_MMC_DATADIR_READ)
>> + sync_dev = host->rxdma;
>> + else
>> + sync_dev = host->txdma;
>> +
>> + edma_stop(sync_dev);
>> + edma_clean_channel(sync_dev);
>> +}
>> +
>> +static void
>> +mmc_davinci_xfer_done(struct mmc_davinci_host *host, struct mmc_data
>> *data);
>> +
>> +static void mmc_davinci_dma_cb(unsigned channel, u16 ch_status, void
>> *data)
>> +{
>> + if (DMA_COMPLETE != ch_status) {
>> + struct mmc_davinci_host *host = data;
>> +
>> + /* Currently means: DMA Event Missed, or "null" transfer
>> + * request was seen. In the future, TC errors (like bad
>> + * addresses) might be presented too.
>> + */
>> + dev_warn(mmc_dev(host->mmc), "DMA %s error\n",
>> + (host->data->flags & MMC_DATA_WRITE)
>> + ? "write" : "read");
>> + host->data->error = -EIO;
>> + mmc_davinci_xfer_done(host, host->data);
>> + }
>> +}
>> +
>> +/* Set up tx or rx template, to be modified and updated later */
>> +static void __init mmc_davinci_dma_setup(struct mmc_davinci_host
>> *host,
>> + bool tx, struct edmacc_param *template)
>> +{
>> + unsigned sync_dev;
>> + const u16 acnt = 4;
>> + const u16 bcnt = rw_threshold >> 2;
>> + const u16 ccnt = 0;
>> + u32 src_port = 0;
>> + u32 dst_port = 0;
>> + s16 src_bidx, dst_bidx;
>> + s16 src_cidx, dst_cidx;
>> +
>> + /*
>> + * A-B Sync transfer: each DMA request is for one "frame" of
>> + * rw_threshold bytes, broken into "acnt"-size chunks repeated
>> + * "bcnt" times. Each segment needs "ccnt" such frames; since
>> + * we tell the block layer our mmc->max_seg_size limit, we can
>> + * trust (later) that it's within bounds.
>> + *
>> + * The FIFOs are read/written in 4-byte chunks (acnt == 4) and
>> + * EDMA will optimize memory operations to use larger bursts.
>> + */
>> + if (tx) {
>> + sync_dev = host->txdma;
>> +
>> + /* src_prt, ccnt, and link to be set up later */
>> + src_bidx = acnt;
>> + src_cidx = acnt * bcnt;
>> +
>> + dst_port = host->mem_res->start + DAVINCI_MMCDXR;
>> + dst_bidx = 0;
>> + dst_cidx = 0;
>> + } else {
>> + sync_dev = host->rxdma;
>> +
>> + src_port = host->mem_res->start + DAVINCI_MMCDRR;
>> + src_bidx = 0;
>> + src_cidx = 0;
>> +
>> + /* dst_prt, ccnt, and link to be set up later */
>> + dst_bidx = acnt;
>> + dst_cidx = acnt * bcnt;
>> + }
>> +
>> + /*
>> + * We can't use FIFO mode for the FIFOs because MMC FIFO
>> addresses
>> + * are not 256-bit (32-byte) aligned. So we use INCR, and the
>> W8BIT
>> + * parameter is ignored.
>> + */
>> + edma_set_src(sync_dev, src_port, INCR, W8BIT);
>> + edma_set_dest(sync_dev, dst_port, INCR, W8BIT);
>> +
>> + edma_set_src_index(sync_dev, src_bidx, src_cidx);
>> + edma_set_dest_index(sync_dev, dst_bidx, dst_cidx);
>> +
>> + edma_set_transfer_params(sync_dev, acnt, bcnt, ccnt, 8, ABSYNC);
>> +
>> + edma_read_slot(sync_dev, template);
>> +
>> + /* don't bother with irqs or chaining */
>> + template->opt |= sync_dev << 12;
>> +}
>> +
>> +static void mmc_davinci_send_dma_request(struct mmc_davinci_host
>> *host,
>> + struct mmc_data *data)
>> +{
>> + struct edmacc_param *template;
>> + int channel, slot;
>> + unsigned link;
>> + struct scatterlist *sg;
>> + unsigned sg_len;
>> + unsigned bytes_left = host->bytes_left;
>> + const unsigned shift = ffs(rw_threshold) - 1;;
>> +
>> + if (host->data_dir == DAVINCI_MMC_DATADIR_WRITE) {
>> + template = &host->tx_template;
>> + channel = host->txdma;
>> + } else {
>> + template = &host->rx_template;
>> + channel = host->rxdma;
>> + }
>> +
>> + /* We know sg_len and ccnt will never be out of range because
>> + * we told the mmc layer which in turn tells the block layer
>> + * to ensure that it only hands us one scatterlist segment
>> + * per EDMA PARAM entry. Update the PARAM
>> + * entries needed for each segment of this scatterlist.
>> + */
>> + for (slot = channel, link = 0, sg = data->sg, sg_len = host-
>>
>>> sg_len;
>>>
>> + sg_len-- != 0 && bytes_left;
>> + sg = sg_next(sg), slot = host->links[link++]) {
>> + u32 buf = sg_dma_address(sg);
>> + unsigned count = sg_dma_len(sg);
>> +
>> + template->link_bcntrld = sg_len
>> + ? (host->links[link] << 5)
>> + : 0xffff;
>> +
>> + if (count > bytes_left)
>> + count = bytes_left;
>> + bytes_left -= count;
>> +
>> + if (host->data_dir == DAVINCI_MMC_DATADIR_WRITE)
>> + template->src = buf;
>> + else
>> + template->dst = buf;
>> + template->ccnt = count >> shift;
>> +
>> + edma_write_slot(slot, template);
>> + }
>> +
>> + if (host->version == MMC_CTLR_VERSION_2)
>> + edma_clear_event(channel);
>> +
>> + edma_start(channel);
>> +}
>> +
>> +static int mmc_davinci_start_dma_transfer(struct mmc_davinci_host
>> *host,
>> + struct mmc_data *data)
>> +{
>> + int i;
>> + int mask = rw_threshold - 1;
>> +
>> + host->sg_len = dma_map_sg(mmc_dev(host->mmc), data->sg, data-
>>
>>> sg_len,
>>>
>> + ((data->flags & MMC_DATA_WRITE)
>> + ? DMA_TO_DEVICE
>> + : DMA_FROM_DEVICE));
>> +
>> + /* no individual DMA segment should need a partial FIFO */
>> + for (i = 0; i < host->sg_len; i++) {
>> + if (sg_dma_len(data->sg + i) & mask) {
>> + dma_unmap_sg(mmc_dev(host->mmc),
>> + data->sg, data->sg_len,
>> + (data->flags & MMC_DATA_WRITE)
>> + ? DMA_TO_DEVICE
>> + : DMA_FROM_DEVICE);
>> + return -1;
>> + }
>> + }
>> +
>> + host->do_dma = 1;
>> + mmc_davinci_send_dma_request(host, data);
>> +
>> + return 0;
>> +}
>> +
>> +static void __init_or_module
>> +davinci_release_dma_channels(struct mmc_davinci_host *host)
>> +{
>> + unsigned i;
>> +
>> + if (!host->use_dma)
>> + return;
>> +
>> + for (i = 0; i < host->n_link; i++)
>> + edma_free_slot(host->links[i]);
>> +
>> + edma_free_channel(host->txdma);
>> + edma_free_channel(host->rxdma);
>> +}
>> +
>> +static int __init davinci_acquire_dma_channels(struct mmc_davinci_host
>> *host)
>> +{
>> + int r, i;
>> +
>> + /* Acquire master DMA write channel */
>> + r = edma_alloc_channel(host->txdma, mmc_davinci_dma_cb, host,
>> + EVENTQ_DEFAULT);
>> + if (r < 0) {
>> + dev_warn(mmc_dev(host->mmc), "alloc %s channel err %d\n",
>> + "tx", r);
>> + return r;
>> + }
>> + mmc_davinci_dma_setup(host, true, &host->tx_template);
>> +
>> + /* Acquire master DMA read channel */
>> + r = edma_alloc_channel(host->rxdma, mmc_davinci_dma_cb, host,
>> + EVENTQ_DEFAULT);
>> + if (r < 0) {
>> + dev_warn(mmc_dev(host->mmc), "alloc %s channel err %d\n",
>> + "rx", r);
>> + goto free_master_write;
>> + }
>> + mmc_davinci_dma_setup(host, false, &host->rx_template);
>> +
>> + /* Allocate parameter RAM slots, which will later be bound to a
>> + * channel as needed to handle a scatterlist.
>> + */
>> + for (i = 0; i < ARRAY_SIZE(host->links); i++) {
>> + r = edma_alloc_slot(EDMA_SLOT_ANY);
>> + if (r < 0) {
>> + dev_dbg(mmc_dev(host->mmc), "dma PaRAM alloc -->
>> %d\n",
>> + r);
>> + break;
>> + }
>> + host->links[i] = r;
>> + }
>> + host->n_link = i;
>> +
>> + return 0;
>> +
>> +free_master_write:
>> + edma_free_channel(host->txdma);
>> +
>> + return r;
>> +}
>> +
>> +/*--------------------------------------------------------------------
>> --*/
>> +
>> +static void
>> +mmc_davinci_prepare_data(struct mmc_davinci_host *host, struct
>> mmc_request *req)
>> +{
>> + int fifo_lev = (rw_threshold == 32) ? MMCFIFOCTL_FIFOLEV : 0;
>> + int timeout;
>> + struct mmc_data *data = req->data;
>> +
>> + if (host->version == MMC_CTLR_VERSION_2)
>> + fifo_lev = (rw_threshold == 64) ? MMCFIFOCTL_FIFOLEV : 0;
>> +
>> + host->data = data;
>> + if (data == NULL) {
>> + host->data_dir = DAVINCI_MMC_DATADIR_NONE;
>> + writel(0, host->base + DAVINCI_MMCBLEN);
>> + writel(0, host->base + DAVINCI_MMCNBLK);
>> + return;
>> + }
>> +
>> + dev_dbg(mmc_dev(host->mmc), "%s %s, %d blocks of %d bytes\n",
>> + (data->flags & MMC_DATA_STREAM) ? "stream" : "block",
>> + (data->flags & MMC_DATA_WRITE) ? "write" : "read",
>> + data->blocks, data->blksz);
>> + dev_dbg(mmc_dev(host->mmc), " DTO %d cycles + %d ns\n",
>> + data->timeout_clks, data->timeout_ns);
>> + timeout = data->timeout_clks +
>> + (data->timeout_ns / host->ns_in_one_cycle);
>> + if (timeout > 0xffff)
>> + timeout = 0xffff;
>> +
>> + writel(timeout, host->base + DAVINCI_MMCTOD);
>> + writel(data->blocks, host->base + DAVINCI_MMCNBLK);
>> + writel(data->blksz, host->base + DAVINCI_MMCBLEN);
>> +
>> + /* Configure the FIFO */
>> + switch (data->flags & MMC_DATA_WRITE) {
>> + case MMC_DATA_WRITE:
>> + host->data_dir = DAVINCI_MMC_DATADIR_WRITE;
>> + writel(fifo_lev | MMCFIFOCTL_FIFODIR_WR |
>> MMCFIFOCTL_FIFORST,
>> + host->base + DAVINCI_MMCFIFOCTL);
>> + writel(fifo_lev | MMCFIFOCTL_FIFODIR_WR,
>> + host->base + DAVINCI_MMCFIFOCTL);
>> + break;
>> +
>> + default:
>> + host->data_dir = DAVINCI_MMC_DATADIR_READ;
>> + writel(fifo_lev | MMCFIFOCTL_FIFODIR_RD |
>> MMCFIFOCTL_FIFORST,
>> + host->base + DAVINCI_MMCFIFOCTL);
>> + writel(fifo_lev | MMCFIFOCTL_FIFODIR_RD,
>> + host->base + DAVINCI_MMCFIFOCTL);
>> + break;
>> + }
>> +
>> + host->buffer = NULL;
>> + host->bytes_left = data->blocks * data->blksz;
>> +
>> + /* For now we try to use DMA whenever we won't need partial FIFO
>> + * reads or writes, either for the whole transfer (as tested
>> here)
>> + * or for any individual scatterlist segment (tested when we call
>> + * start_dma_transfer).
>> + *
>> + * While we *could* change that, unusual block sizes are rarely
>> + * used. The occasional fallback to PIO should't hurt.
>> + */
>> + if (host->use_dma && (host->bytes_left & (rw_threshold - 1)) == 0
>> + && mmc_davinci_start_dma_transfer(host, data) == 0)
>>
> {
>
>> + /* zero this to ensure we take no PIO paths */
>> + host->bytes_left = 0;
>> + } else {
>> + /* Revert to CPU Copy */
>> + host->sg_len = data->sg_len;
>> + host->sg = host->data->sg;
>> + mmc_davinci_sg_to_buf(host);
>> + }
>> +}
>> +
>> +static void mmc_davinci_request(struct mmc_host *mmc, struct
>> mmc_request *req)
>> +{
>> + struct mmc_davinci_host *host = mmc_priv(mmc);
>> + unsigned long timeout = jiffies + msecs_to_jiffies(900);
>> + u32 mmcst1 = 0;
>> +
>> + /* Card may still be sending BUSY after a previous operation,
>> + * typically some kind of write. If so, we can't proceed yet.
>> + */
>> + while (time_before(jiffies, timeout)) {
>> + mmcst1 = readl(host->base + DAVINCI_MMCST1);
>> + if (!(mmcst1 & MMCST1_BUSY))
>> + break;
>> + cpu_relax();
>> + }
>> + if (mmcst1 & MMCST1_BUSY) {
>> + dev_err(mmc_dev(host->mmc), "still BUSY? bad ... \n");
>> + req->cmd->error = -ETIMEDOUT;
>> + mmc_request_done(mmc, req);
>> + return;
>> + }
>> +
>> + host->do_dma = 0;
>> + mmc_davinci_prepare_data(host, req);
>> + mmc_davinci_start_command(host, req->cmd);
>> +}
>> +
>> +static unsigned int calculate_freq_for_card(struct mmc_davinci_host
>> *host,
>> + unsigned int mmc_req_freq)
>> +{
>> + unsigned int mmc_freq = 0, mmc_pclk = 0, mmc_push_pull_divisor =
>> 0;
>> +
>> + mmc_pclk = host->mmc_input_clk;
>> + if (mmc_req_freq && mmc_pclk > (2 * mmc_req_freq))
>> + mmc_push_pull_divisor = ((unsigned int)mmc_pclk
>> + / (2 * mmc_req_freq)) - 1;
>> + else
>> + mmc_push_pull_divisor = 0;
>> +
>> + mmc_freq = (unsigned int)mmc_pclk
>> + / (2 * (mmc_push_pull_divisor + 1));
>> +
>> + if (mmc_freq > mmc_req_freq)
>> + mmc_push_pull_divisor = mmc_push_pull_divisor + 1;
>> + /* Convert ns to clock cycles */
>> + if (mmc_req_freq <= 400000)
>> + host->ns_in_one_cycle = (1000000) / (((mmc_pclk
>> + / (2 * (mmc_push_pull_divisor + 1)))/1000));
>> + else
>> + host->ns_in_one_cycle = (1000000) / (((mmc_pclk
>> + / (2 * (mmc_push_pull_divisor +
>>
> 1)))/1000000));
>
>> +
>> + return mmc_push_pull_divisor;
>> +}
>> +
>> +static void mmc_davinci_set_ios(struct mmc_host *mmc, struct mmc_ios
>> *ios)
>> +{
>> + unsigned int open_drain_freq = 0, mmc_pclk = 0;
>> + unsigned int mmc_push_pull_freq = 0;
>> + struct mmc_davinci_host *host = mmc_priv(mmc);
>> +
>> + mmc_pclk = host->mmc_input_clk;
>> + dev_dbg(mmc_dev(host->mmc),
>> + "clock %dHz busmode %d powermode %d Vdd %04x\n",
>> + ios->clock, ios->bus_mode, ios->power_mode,
>> + ios->vdd);
>> + if (ios->bus_width == MMC_BUS_WIDTH_4) {
>> + dev_dbg(mmc_dev(host->mmc), "Enabling 4 bit mode\n");
>> + writel(readl(host->base + DAVINCI_MMCCTL) |
>> MMCCTL_WIDTH_4_BIT,
>> + host->base + DAVINCI_MMCCTL);
>> + } else {
>> + dev_dbg(mmc_dev(host->mmc), "Disabling 4 bit mode\n");
>> + writel(readl(host->base + DAVINCI_MMCCTL) &
>> ~MMCCTL_WIDTH_4_BIT,
>> + host->base + DAVINCI_MMCCTL);
>> + }
>> +
>> + if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN) {
>> + u32 temp;
>> +
>> + /* Ignoring the init clock value passed for fixing the
>> inter
>> + * operability with different cards.
>> + */
>> + open_drain_freq = ((unsigned int)mmc_pclk
>> + / (2 * MMCSD_INIT_CLOCK)) - 1;
>> +
>> + if (open_drain_freq > 0xFF)
>> + open_drain_freq = 0xFF;
>> +
>> + temp = readl(host->base + DAVINCI_MMCCLK) &
>> ~MMCCLK_CLKRT_MASK;
>> + temp |= open_drain_freq;
>> + writel(temp, host->base + DAVINCI_MMCCLK);
>> +
>> + /* Convert ns to clock cycles */
>> + host->ns_in_one_cycle = (1000000) /
>> (MMCSD_INIT_CLOCK/1000);
>> + } else {
>> + u32 temp;
>> + mmc_push_pull_freq = calculate_freq_for_card(host, ios-
>>
>>> clock);
>>>
>> +
>> + if (mmc_push_pull_freq > 0xFF)
>> + mmc_push_pull_freq = 0xFF;
>> +
>> + temp = readl(host->base + DAVINCI_MMCCLK) & ~MMCCLK_CLKEN;
>> + writel(temp, host->base + DAVINCI_MMCCLK);
>> +
>> + udelay(10);
>> +
>> + temp = readl(host->base + DAVINCI_MMCCLK) &
>> ~MMCCLK_CLKRT_MASK;
>> + temp |= mmc_push_pull_freq;
>> + writel(temp, host->base + DAVINCI_MMCCLK);
>> +
>> + writel(temp | MMCCLK_CLKEN, host->base + DAVINCI_MMCCLK);
>> +
>> + udelay(10);
>> + }
>> +
>> + host->bus_mode = ios->bus_mode;
>> + if (ios->power_mode == MMC_POWER_UP) {
>> + unsigned long timeout = jiffies + msecs_to_jiffies(50);
>> + bool lose = true;
>> +
>> + /* Send clock cycles, poll completion */
>> + writel(0, host->base + DAVINCI_MMCARGHL);
>> + writel(MMCCMD_INITCK, host->base + DAVINCI_MMCCMD);
>> + while (time_before(jiffies, timeout)) {
>> + u32 tmp = readl(host->base + DAVINCI_MMCST0);
>> +
>> + if (tmp & MMCST0_RSPDNE) {
>> + lose = false;
>> + break;
>> + }
>> + cpu_relax();
>> + }
>> + if (lose)
>> + dev_warn(mmc_dev(host->mmc), "powerup timeout\n");
>> + }
>> +
>> + /* FIXME on power OFF, reset things ... */
>> +}
>> +
>> +static void
>> +mmc_davinci_xfer_done(struct mmc_davinci_host *host, struct mmc_data
>> *data)
>> +{
>> + host->data = NULL;
>> + host->data_dir = DAVINCI_MMC_DATADIR_NONE;
>> +
>> + if (host->do_dma) {
>> + davinci_abort_dma(host);
>> +
>> + dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
>> + (data->flags & MMC_DATA_WRITE)
>> + ? DMA_TO_DEVICE
>> + : DMA_FROM_DEVICE);
>> + host->do_dma = false;
>> + }
>> +
>> + if (!data->stop || (host->cmd && host->cmd->error)) {
>> + mmc_request_done(host->mmc, data->mrq);
>> + writel(0, host->base + DAVINCI_MMCIM);
>> + } else
>> + mmc_davinci_start_command(host, data->stop);
>> +}
>> +
>> +static void mmc_davinci_cmd_done(struct mmc_davinci_host *host,
>> + struct mmc_command *cmd)
>> +{
>> + host->cmd = NULL;
>> +
>> + if (cmd->flags & MMC_RSP_PRESENT) {
>> + if (cmd->flags & MMC_RSP_136) {
>> + /* response type 2 */
>> + cmd->resp[3] = readl(host->base + DAVINCI_MMCRSP01);
>> + cmd->resp[2] = readl(host->base + DAVINCI_MMCRSP23);
>> + cmd->resp[1] = readl(host->base + DAVINCI_MMCRSP45);
>> + cmd->resp[0] = readl(host->base + DAVINCI_MMCRSP67);
>> + } else {
>> + /* response types 1, 1b, 3, 4, 5, 6 */
>> + cmd->resp[0] = readl(host->base + DAVINCI_MMCRSP67);
>> + }
>> + }
>> +
>> + if (host->data == NULL || cmd->error) {
>> + if (cmd->error == -ETIMEDOUT)
>> + cmd->mrq->cmd->retries = 0;
>> + mmc_request_done(host->mmc, cmd->mrq);
>> + writel(0, host->base + DAVINCI_MMCIM);
>> + }
>> +}
>> +
>> +static void
>> +davinci_abort_data(struct mmc_davinci_host *host, struct mmc_data
>> *data)
>> +{
>> + u32 temp;
>> +
>> + /* reset command and data state machines */
>> + temp = readl(host->base + DAVINCI_MMCCTL);
>> + writel(temp | MMCCTL_CMDRST | MMCCTL_DATRST,
>> + host->base + DAVINCI_MMCCTL);
>> +
>> + temp &= ~(MMCCTL_CMDRST | MMCCTL_DATRST);
>> + udelay(10);
>> + writel(temp, host->base + DAVINCI_MMCCTL);
>> +}
>> +
>> +static irqreturn_t mmc_davinci_irq(int irq, void *dev_id)
>> +{
>> + struct mmc_davinci_host *host = (struct mmc_davinci_host
>> *)dev_id;
>> + unsigned int status, qstatus;
>> + int end_command = 0;
>> + int end_transfer = 0;
>> + struct mmc_data *data = host->data;
>> +
>> + if (host->cmd == NULL && host->data == NULL) {
>> + status = readl(host->base + DAVINCI_MMCST0);
>> + dev_dbg(mmc_dev(host->mmc),
>> + "Spurious interrupt 0x%04x\n", status);
>> + /* Disable the interrupt from mmcsd */
>> + writel(0, host->base + DAVINCI_MMCIM);
>> + return IRQ_NONE;
>> + }
>> +
>> + status = readl(host->base + DAVINCI_MMCST0);
>> + qstatus = status;
>> +
>> + /* handle FIFO first when using PIO for data.
>> + * bytes_left will decrease to zero as I/O progress and status
>> will
>> + * read zero over iteration because this controller status
>> + * register(MMCST0) reports any status only once and it is
>> cleared
>> + * by read. So, it is not unbouned loop even in the case of
>> + * non-dma.
>> + */
>> + while (host->bytes_left && (status & (MMCST0_DXRDY |
>> MMCST0_DRRDY))) {
>> + davinci_fifo_data_trans(host, rw_threshold);
>> + status = readl(host->base + DAVINCI_MMCST0);
>> + if (!status)
>> + break;
>> + qstatus |= status;
>> + }
>> +
>> + if (qstatus & MMCST0_DATDNE) {
>> + /* All blocks sent/received, and CRC checks passed */
>> + if (data != NULL) {
>> + if ((host->do_dma == 0) && (host->bytes_left > 0)) {
>> + /* if datasize < rw_threshold
>> + * no RX ints are generated
>> + */
>> + davinci_fifo_data_trans(host, host-
>>
>>> bytes_left);
>>>
>> + }
>> + end_transfer = 1;
>> + data->bytes_xfered = data->blocks * data->blksz;
>> + } else {
>> + dev_err(mmc_dev(host->mmc),
>> + "DATDNE with no host->data\n");
>> + }
>> + }
>> +
>> + if (qstatus & MMCST0_TOUTRD) {
>> + /* Read data timeout */
>> + data->error = -ETIMEDOUT;
>> + end_transfer = 1;
>> +
>> + dev_dbg(mmc_dev(host->mmc),
>> + "read data timeout, status %x\n",
>> + qstatus);
>> +
>> + davinci_abort_data(host, data);
>> + }
>> +
>> + if (qstatus & (MMCST0_CRCWR | MMCST0_CRCRD)) {
>> + /* Data CRC error */
>> + data->error = -EILSEQ;
>> + end_transfer = 1;
>> +
>> + /* NOTE: this controller uses CRCWR to report both CRC
>> + * errors and timeouts (on writes). MMCDRSP values are
>> + * only weakly documented, but 0x9f was clearly a timeout
>> + * case and the two three-bit patterns in various SD specs
>> + * (101, 010) aren't part of it ...
>> + */
>> + if (qstatus & MMCST0_CRCWR) {
>> + u32 temp = readb(host->base + DAVINCI_MMCDRSP);
>> +
>> + if (temp == 0x9f)
>> + data->error = -ETIMEDOUT;
>> + }
>> + dev_dbg(mmc_dev(host->mmc), "data %s %s error\n",
>> + (qstatus & MMCST0_CRCWR) ? "write" : "read",
>> + (data->error == -ETIMEDOUT) ? "timeout" : "CRC");
>> +
>> + davinci_abort_data(host, data);
>> + }
>> +
>> + if (qstatus & MMCST0_TOUTRS) {
>> + /* Command timeout */
>> + if (host->cmd) {
>> + dev_dbg(mmc_dev(host->mmc),
>> + "CMD%d timeout, status %x\n",
>> + host->cmd->opcode, qstatus);
>> + host->cmd->error = -ETIMEDOUT;
>> + if (data) {
>> + end_transfer = 1;
>> + davinci_abort_data(host, data);
>> + } else
>> + end_command = 1;
>> + }
>> + }
>> +
>> + if (qstatus & MMCST0_CRCRS) {
>> + /* Command CRC error */
>> + dev_dbg(mmc_dev(host->mmc), "Command CRC error\n");
>> + if (host->cmd) {
>> + host->cmd->error = -EILSEQ;
>> + end_command = 1;
>> + }
>> + }
>> +
>> + if (qstatus & MMCST0_RSPDNE) {
>> + /* End of command phase */
>> + end_command = (int) host->cmd;
>> + }
>> +
>> + if (end_command)
>> + mmc_davinci_cmd_done(host, host->cmd);
>> + if (end_transfer)
>> + mmc_davinci_xfer_done(host, data);
>> + return IRQ_HANDLED;
>> +}
>> +
>> +static int mmc_davinci_get_cd(struct mmc_host *mmc)
>> +{
>> + struct platform_device *pdev = to_platform_device(mmc->parent);
>> + struct davinci_mmc_config *config = pdev->dev.platform_data;
>> +
>> + if (!config || !config->get_cd)
>> + return -ENOSYS;
>> + return config->get_cd(pdev->id);
>> +}
>> +
>> +static int mmc_davinci_get_ro(struct mmc_host *mmc)
>> +{
>> + struct platform_device *pdev = to_platform_device(mmc->parent);
>> + struct davinci_mmc_config *config = pdev->dev.platform_data;
>> +
>> + if (!config || !config->get_ro)
>> + return -ENOSYS;
>> + return config->get_ro(pdev->id);
>> +}
>> +
>> +static struct mmc_host_ops mmc_davinci_ops = {
>> + .request = mmc_davinci_request,
>> + .set_ios = mmc_davinci_set_ios,
>> + .get_cd = mmc_davinci_get_cd,
>> + .get_ro = mmc_davinci_get_ro,
>> +};
>> +
>> +/*--------------------------------------------------------------------
>> --*/
>> +
>> +static void __init init_mmcsd_host(struct mmc_davinci_host *host)
>> +{
>> + /* DAT line portion is diabled and in reset state */
>> + writel(readl(host->base + DAVINCI_MMCCTL) | MMCCTL_DATRST,
>> + host->base + DAVINCI_MMCCTL);
>> +
>> + /* CMD line portion is diabled and in reset state */
>> + writel(readl(host->base + DAVINCI_MMCCTL) | MMCCTL_CMDRST,
>> + host->base + DAVINCI_MMCCTL);
>> +
>> + udelay(10);
>> +
>> + writel(0, host->base + DAVINCI_MMCCLK);
>> + writel(MMCCLK_CLKEN, host->base + DAVINCI_MMCCLK);
>> +
>> + writel(0x1FFF, host->base + DAVINCI_MMCTOR);
>> + writel(0xFFFF, host->base + DAVINCI_MMCTOD);
>> +
>> + writel(readl(host->base + DAVINCI_MMCCTL) & ~MMCCTL_DATRST,
>> + host->base + DAVINCI_MMCCTL);
>> + writel(readl(host->base + DAVINCI_MMCCTL) & ~MMCCTL_CMDRST,
>> + host->base + DAVINCI_MMCCTL);
>> +
>> + udelay(10);
>> +}
>> +
>> +static int __init davinci_mmcsd_probe(struct platform_device *pdev)
>> +{
>> + struct davinci_mmc_config *pdata = pdev->dev.platform_data;
>> + struct mmc_davinci_host *host = NULL;
>> + struct mmc_host *mmc = NULL;
>> + struct resource *r, *mem = NULL;
>> + int ret = 0, irq = 0;
>> + size_t mem_size;
>> +
>> + /* REVISIT: when we're fully converted, fail if pdata is NULL */
>> +
>> + ret = -ENODEV;
>> + r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> + irq = platform_get_irq(pdev, 0);
>> + if (!r || irq == NO_IRQ)
>> + goto out;
>> +
>> + ret = -EBUSY;
>> + mem_size = resource_size(r);
>> + mem = request_mem_region(r->start, mem_size, pdev->name);
>> + if (!mem)
>> + goto out;
>> +
>> + ret = -ENOMEM;
>> + mmc = mmc_alloc_host(sizeof(struct mmc_davinci_host), &pdev-
>>
>>> dev);
>>>
>> + if (!mmc)
>> + goto out;
>> +
>> + host = mmc_priv(mmc);
>> + host->mmc = mmc; /* Important */
>> +
>> + r = platform_get_resource(pdev, IORESOURCE_DMA, 0);
>> + if (!r)
>> + goto out;
>> + host->rxdma = r->start;
>> +
>> + r = platform_get_resource(pdev, IORESOURCE_DMA, 1);
>> + if (!r)
>> + goto out;
>> + host->txdma = r->start;
>> +
>> + host->mem_res = mem;
>> + host->base = ioremap(mem->start, mem_size);
>> + if (!host->base)
>> + goto out;
>> +
>> + ret = -ENXIO;
>> + host->clk = clk_get(&pdev->dev, "MMCSDCLK");
>> + if (IS_ERR(host->clk)) {
>> + ret = PTR_ERR(host->clk);
>> + goto out;
>> + }
>> + clk_enable(host->clk);
>> + host->mmc_input_clk = clk_get_rate(host->clk);
>> +
>> + init_mmcsd_host(host);
>> +
>> + host->use_dma = use_dma;
>> + host->irq = irq;
>> +
>> + if (host->use_dma && davinci_acquire_dma_channels(host) != 0)
>> + host->use_dma = 0;
>> +
>> + /* REVISIT: someday, support IRQ-driven card detection. */
>> + mmc->caps |= MMC_CAP_NEEDS_POLL;
>> +
>> + if (!pdata || pdata->wires == 4 || pdata->wires == 0)
>> + mmc->caps |= MMC_CAP_4_BIT_DATA;
>> +
>> + host->version = pdata->version;
>> +
>> + mmc->ops = &mmc_davinci_ops;
>> + mmc->f_min = 312500;
>> + mmc->f_max = 25000000;
>> + if (pdata && pdata->max_freq)
>> + mmc->f_max = pdata->max_freq;
>> + if (pdata && pdata->caps)
>> + mmc->caps |= pdata->caps;
>> + mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
>> +
>> + /* With no iommu coalescing pages, each phys_seg is a hw_seg.
>> + * Each hw_seg uses one EDMA parameter RAM slot, always one
>> + * channel and then usually some linked slots.
>> + */
>> + mmc->max_hw_segs = 1 + host->n_link;
>> + mmc->max_phys_segs = mmc->max_hw_segs;
>> +
>> + /* EDMA limit per hw segment (one or two MBytes) */
>> + mmc->max_seg_size = MAX_CCNT * rw_threshold;
>> +
>> + /* MMC/SD controller limits for multiblock requests */
>> + mmc->max_blk_size = 4095; /* BLEN is 12 bits */
>> + mmc->max_blk_count = 65535; /* NBLK is 16 bits */
>> + mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
>> +
>> + dev_dbg(mmc_dev(host->mmc), "max_phys_segs=%d\n", mmc-
>>
>>> max_phys_segs);
>>>
>> + dev_dbg(mmc_dev(host->mmc), "max_hw_segs=%d\n", mmc-
>>
>>> max_hw_segs);
>>>
>> + dev_dbg(mmc_dev(host->mmc), "max_blk_size=%d\n", mmc-
>>
>>> max_blk_size);
>>>
>> + dev_dbg(mmc_dev(host->mmc), "max_req_size=%d\n", mmc-
>>
>>> max_req_size);
>>>
>> + dev_dbg(mmc_dev(host->mmc), "max_seg_size=%d\n", mmc-
>>
>>> max_seg_size);
>>>
>> +
>> + platform_set_drvdata(pdev, host);
>> +
>> + ret = mmc_add_host(mmc);
>> + if (ret < 0)
>> + goto out;
>> +
>> + ret = request_irq(irq, mmc_davinci_irq, 0, mmc_hostname(mmc),
>> host);
>> + if (ret)
>> + goto out;
>> +
>> + rename_region(mem, mmc_hostname(mmc));
>> +
>> + dev_info(mmc_dev(host->mmc), "Using %s, %d-bit mode\n",
>> + host->use_dma ? "DMA" : "PIO",
>> + (mmc->caps & MMC_CAP_4_BIT_DATA) ? 4 : 1);
>> +
>> + return 0;
>> +
>> +out:
>> + if (host) {
>> + davinci_release_dma_channels(host);
>> +
>> + if (host->clk) {
>> + clk_disable(host->clk);
>> + clk_put(host->clk);
>> + }
>> +
>> + if (host->base)
>> + iounmap(host->base);
>> + }
>> +
>> + if (mmc)
>> + mmc_free_host(mmc);
>> +
>> + if (mem)
>> + release_resource(mem);
>> +
>> + dev_dbg(&pdev->dev, "probe err %d\n", ret);
>> +
>> + return ret;
>> +}
>> +
>> +static int __exit davinci_mmcsd_remove(struct platform_device *pdev)
>> +{
>> + struct mmc_davinci_host *host = platform_get_drvdata(pdev);
>> +
>> + platform_set_drvdata(pdev, NULL);
>> + if (host) {
>> + mmc_remove_host(host->mmc);
>> + free_irq(host->irq, host);
>> +
>> + davinci_release_dma_channels(host);
>> +
>> + clk_disable(host->clk);
>> + clk_put(host->clk);
>> +
>> + iounmap(host->base);
>> +
>> + release_resource(host->mem_res);
>> +
>> + mmc_free_host(host->mmc);
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +#ifdef CONFIG_PM
>> +static int davinci_mmcsd_suspend(struct platform_device *pdev,
>> pm_message_t msg)
>> +{
>> + struct mmc_davinci_host *host = platform_get_drvdata(pdev);
>> +
>> + return mmc_suspend_host(host->mmc, msg);
>> +}
>> +
>> +static int davinci_mmcsd_resume(struct platform_device *pdev)
>> +{
>> + struct mmc_davinci_host *host = platform_get_drvdata(pdev);
>> +
>> + return mmc_resume_host(host->mmc);
>> +}
>> +#else
>> +#define davinci_mmcsd_suspend NULL
>> +#define davinci_mmcsd_resume NULL
>> +#endif
>> +
>> +static struct platform_driver davinci_mmcsd_driver = {
>> + .driver = {
>> + .name = "davinci_mmc",
>> + .owner = THIS_MODULE,
>> + },
>> + .remove = __exit_p(davinci_mmcsd_remove),
>> + .suspend = davinci_mmcsd_suspend,
>> + .resume = davinci_mmcsd_resume,
>> +};
>> +
>> +static int __init davinci_mmcsd_init(void)
>> +{
>> + return platform_driver_probe(&davinci_mmcsd_driver,
>> + davinci_mmcsd_probe);
>> +}
>> +module_init(davinci_mmcsd_init);
>> +
>> +static void __exit davinci_mmcsd_exit(void)
>> +{
>> + platform_driver_unregister(&davinci_mmcsd_driver);
>> +}
>> +module_exit(davinci_mmcsd_exit);
>> +
>> +MODULE_AUTHOR("Texas Instruments India");
>> +MODULE_LICENSE("GPL");
>> +MODULE_DESCRIPTION("MMC/SD driver for Davinci MMC controller");
>> +
>> --
>> 1.5.6
>>
>
>
> _______________________________________________
> Davinci-linux-open-source mailing list
> Davinci-linux-open-source@...ux.davincidsp.com
> http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source
>
>
>
hi, Vipin
Whether it supports SDHC card on DM355 EVM? I am using the dvsdk based
on linux-2.6.10 , I found out SDHC cards can't work. I don't know how to
solve this problem.
please give me some tips will welcome.
best regards.
--
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