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Message-ID: <20071219142213.GD29882@prithivi.gnumonks.org>
Date: Wed, 19 Dec 2007 15:22:13 +0100
From: Harald Welte <laforge@...nmoko.org>
To: linux-kernel@...r.kernel.org
Cc: drzeus-mmc@...eus.cx, tk@...ntech.de, ben-linux@...ff.org
Subject: [PATCH] Samsung S3C24xx SD/MMC driver
Hi!
This is a MMC/SD driver for the Samsung S3C24xx SD/MMC controller, originally
developed years ago by Thomas Kleffel <tk@...ntech.de>.
Due to time constraints, he had no time to further maintain the driver
and follow the mainline Linux changes in the SD/MMC stack.
With his authorization, I have taken over the task of making it
compliant to the current mainline SD/MMC API and take care of the
mainline kernel merge.
So please advise on whatever changes you deem neccessary and I'll try to
do my best to incorporate them for a hopefully not-too-distant mainline
merge.
After a potential kernel inclusion, we would co-maintain the driver.
Acked-by: Thomas Kleffel <tk@...ntech.de>
Signed-off-by: Harald Welte <laforge@...nmoko.org>
---
Index: linux-2.6/include/asm-arm/arch-s3c2410/regs-sdi.h
===================================================================
--- linux-2.6.orig/include/asm-arm/arch-s3c2410/regs-sdi.h
+++ linux-2.6/include/asm-arm/arch-s3c2410/regs-sdi.h
@@ -28,9 +28,15 @@
#define S3C2410_SDIDCNT (0x30)
#define S3C2410_SDIDSTA (0x34)
#define S3C2410_SDIFSTA (0x38)
+
#define S3C2410_SDIDATA (0x3C)
#define S3C2410_SDIIMSK (0x40)
+#define S3C2440_SDIDATA (0x40)
+#define S3C2440_SDIIMSK (0x3C)
+
+#define S3C2440_SDICON_SDRESET (1<<8)
+#define S3C2440_SDICON_MMCCLOCK (1<<5)
#define S3C2410_SDICON_BYTEORDER (1<<4)
#define S3C2410_SDICON_SDIOIRQ (1<<3)
#define S3C2410_SDICON_RWAITEN (1<<2)
@@ -42,7 +48,8 @@
#define S3C2410_SDICMDCON_LONGRSP (1<<10)
#define S3C2410_SDICMDCON_WAITRSP (1<<9)
#define S3C2410_SDICMDCON_CMDSTART (1<<8)
-#define S3C2410_SDICMDCON_INDEX (0xff)
+#define S3C2410_SDICMDCON_SENDERHOST (1<<6)
+#define S3C2410_SDICMDCON_INDEX (0x3f)
#define S3C2410_SDICMDSTAT_CRCFAIL (1<<12)
#define S3C2410_SDICMDSTAT_CMDSENT (1<<11)
@@ -51,6 +58,9 @@
#define S3C2410_SDICMDSTAT_XFERING (1<<8)
#define S3C2410_SDICMDSTAT_INDEX (0xff)
+#define S3C2440_SDIDCON_DS_BYTE (0<<22)
+#define S3C2440_SDIDCON_DS_HALFWORD (1<<22)
+#define S3C2440_SDIDCON_DS_WORD (2<<22)
#define S3C2410_SDIDCON_IRQPERIOD (1<<21)
#define S3C2410_SDIDCON_TXAFTERRESP (1<<20)
#define S3C2410_SDIDCON_RXAFTERCMD (1<<19)
@@ -59,6 +69,7 @@
#define S3C2410_SDIDCON_WIDEBUS (1<<16)
#define S3C2410_SDIDCON_DMAEN (1<<15)
#define S3C2410_SDIDCON_STOP (1<<14)
+#define S3C2440_SDIDCON_DATSTART (1<<14)
#define S3C2410_SDIDCON_DATMODE (3<<12)
#define S3C2410_SDIDCON_BLKNUM (0x7ff)
@@ -68,6 +79,7 @@
#define S3C2410_SDIDCON_XFER_RXSTART (2<<12)
#define S3C2410_SDIDCON_XFER_TXSTART (3<<12)
+#define S3C2410_SDIDCON_BLKNUM_MASK (0xFFF)
#define S3C2410_SDIDCNT_BLKNUM_SHIFT (12)
#define S3C2410_SDIDSTA_RDYWAITREQ (1<<10)
@@ -82,10 +94,12 @@
#define S3C2410_SDIDSTA_TXDATAON (1<<1)
#define S3C2410_SDIDSTA_RXDATAON (1<<0)
+#define S3C2440_SDIFSTA_FIFORESET (1<<16)
+#define S3C2440_SDIFSTA_FIFOFAIL (3<<14) /* 3 is correct (2 bits) */
#define S3C2410_SDIFSTA_TFDET (1<<13)
#define S3C2410_SDIFSTA_RFDET (1<<12)
-#define S3C2410_SDIFSTA_TXHALF (1<<11)
-#define S3C2410_SDIFSTA_TXEMPTY (1<<10)
+#define S3C2410_SDIFSTA_TFHALF (1<<11)
+#define S3C2410_SDIFSTA_TFEMPTY (1<<10)
#define S3C2410_SDIFSTA_RFLAST (1<<9)
#define S3C2410_SDIFSTA_RFFULL (1<<8)
#define S3C2410_SDIFSTA_RFHALF (1<<7)
Index: linux-2.6/drivers/mmc/host/s3cmci.c
===================================================================
--- /dev/null
+++ linux-2.6/drivers/mmc/host/s3cmci.c
@@ -0,0 +1,1409 @@
+/*
+ * linux/drivers/mmc/s3cmci.h - Samsung S3C MCI driver
+ *
+ * Copyright (C) 2004-2006 maintech GmbH, Thomas Kleffel <tk@...ntech.de>
+ * Copyright (C) 2007 OpenMoko, Inc., Harald Welte <laforge@...nmoko.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/dma-mapping.h>
+#include <linux/clk.h>
+#include <linux/mmc/mmc.h>
+#include <linux/mmc/host.h>
+#include <linux/platform_device.h>
+#include <linux/irq.h>
+
+#include <asm/dma.h>
+#include <asm/dma-mapping.h>
+
+#include <asm/io.h>
+#include <asm/arch/regs-sdi.h>
+#include <asm/arch/regs-gpio.h>
+#include <asm/arch/mci.h>
+
+#include "s3cmci.h"
+
+#define DRIVER_NAME "s3c-mci"
+
+enum dbg_channels {
+ dbg_err = (1 << 0),
+ dbg_debug = (1 << 1),
+ dbg_info = (1 << 2),
+ dbg_irq = (1 << 3),
+ dbg_sg = (1 << 4),
+ dbg_dma = (1 << 5),
+ dbg_pio = (1 << 6),
+ dbg_fail = (1 << 7),
+ dbg_conf = (1 << 8),
+};
+
+static const int dbgmap_err = dbg_err | dbg_fail;
+static const int dbgmap_info = dbg_info | dbg_conf;
+static const int dbgmap_debug = dbg_debug;
+
+#define dbg(host, channels, args...) \
+ do { \
+ if (dbgmap_err & channels) \
+ dev_err(&host->pdev->dev, args); \
+ else if (dbgmap_info & channels) \
+ dev_info(&host->pdev->dev, args);\
+ else if (dbgmap_debug & channels) \
+ dev_dbg(&host->pdev->dev, args); \
+ } while (0)
+
+#define RESSIZE(ressource) (((ressource)->end - (ressource)->start)+1)
+
+static struct s3c2410_dma_client s3cmci_dma_client = {
+ .name = "s3c-mci",
+};
+
+static void finalize_request(struct s3cmci_host *host);
+static void s3cmci_send_request(struct mmc_host *mmc);
+static void s3cmci_reset(struct s3cmci_host *host);
+
+#ifdef CONFIG_MMC_DEBUG
+
+static char *mmc_cmd2str(int cmd)
+{
+ switch (cmd) {
+ case 0: return "GO_IDLE_STATE";
+ case 1: return "ALL_SEND_OCR";
+ case 2: return "ALL_SEND_CID";
+ case 3: return "ALL_SEND_RELATIVE_ADD";
+ case 6: return "ACMD: SD_SET_BUSWIDTH";
+ case 7: return "SEL_DESEL_CARD";
+ case 9: return "SEND_CSD";
+ case 10: return "SEND_CID";
+ case 11: return "READ_UNTIL_STOP";
+ case 12: return "STOP_TRANSMISSION";
+ case 13: return "SEND_STATUS";
+ case 15: return "GO_INACTIVE_STATE";
+ case 16: return "SET_BLOCKLEN";
+ case 17: return "READ_SINGLE_BLOCK";
+ case 18: return "READ_MULTIPLE_BLOCK";
+ case 24: return "WRITE_SINGLE_BLOCK";
+ case 25: return "WRITE_MULTIPLE_BLOCK";
+ case 41: return "ACMD: SD_APP_OP_COND";
+ case 55: return "APP_CMD";
+ default: return "UNKNOWN";
+ }
+}
+
+static char *mmc_err2str(int err)
+{
+ switch (err) {
+ case 0: return "OK";
+ case -ETIMEDOUT: return "TIMEOUT";
+ case -EILSEQ: return "BADCRC";
+ case -EINVAL: return "EINVAL";
+ case -ENOMEDIUM: return "NOMEDIUM";
+ default: return "UNKNOWN";
+ }
+}
+
+static inline void dbg_dumpregs(struct s3cmci_host *host, char *prefix)
+{
+ u32 con, pre, cmdarg, cmdcon, cmdsta, r0, r1, r2, r3, timer, bsize;
+ u32 datcon, datcnt, datsta, fsta, imask;
+
+ con = readl(host->base + S3C2410_SDICON);
+ pre = readl(host->base + S3C2410_SDIPRE);
+ cmdarg = readl(host->base + S3C2410_SDICMDARG);
+ cmdcon = readl(host->base + S3C2410_SDICMDCON);
+ cmdsta = readl(host->base + S3C2410_SDICMDSTAT);
+ r0 = readl(host->base + S3C2410_SDIRSP0);
+ r1 = readl(host->base + S3C2410_SDIRSP1);
+ r2 = readl(host->base + S3C2410_SDIRSP2);
+ r3 = readl(host->base + S3C2410_SDIRSP3);
+ timer = readl(host->base + S3C2410_SDITIMER);
+ bsize = readl(host->base + S3C2410_SDIBSIZE);
+ datcon = readl(host->base + S3C2410_SDIDCON);
+ datcnt = readl(host->base + S3C2410_SDIDCNT);
+ datsta = readl(host->base + S3C2410_SDIDSTA);
+ fsta = readl(host->base + S3C2410_SDIFSTA);
+ imask = readl(host->base + host->sdiimsk);
+
+ dbg(host, dbg_debug, "%s CON:[%08x] PRE:[%08x] TMR:[%08x]\n",
+ prefix, con, pre, timer);
+
+ dbg(host, dbg_debug, "%s CCON:[%08x] CARG:[%08x] CSTA:[%08x]\n",
+ prefix, cmdcon, cmdarg, cmdsta);
+
+ dbg(host, dbg_debug, "%s DCON:[%08x] FSTA:[%08x]"
+ " DSTA:[%08x] DCNT:[%08x]\n",
+ prefix, datcon, fsta, datsta, datcnt);
+
+ dbg(host, dbg_debug, "%s R0:[%08x] R1:[%08x]"
+ " R2:[%08x] R3:[%08x]\n",
+ prefix, r0, r1, r2, r3);
+}
+
+static void prepare_dbgmsg(struct s3cmci_host *host, struct mmc_command *cmd,
+ int stop)
+{
+ snprintf(host->dbgmsg_cmd, 300,
+ "#%u%s op:%s(%i) arg:0x%08x flags:0x08%x retries:%u",
+ host->ccnt, (stop?" (STOP)":""), mmc_cmd2str(cmd->opcode),
+ cmd->opcode, cmd->arg, cmd->flags, cmd->retries);
+
+ if (cmd->data) {
+ snprintf(host->dbgmsg_dat, 300,
+ "#%u bsize:%u blocks:%u bytes:%u",
+ host->dcnt, cmd->data->blksz,
+ cmd->data->blocks,
+ cmd->data->blocks * cmd->data->blksz);
+ } else {
+ host->dbgmsg_dat[0] = '\0';
+ }
+}
+
+static void dbg_dumpcmd(struct s3cmci_host *host, struct mmc_command *cmd,
+ int fail)
+{
+ unsigned int dbglvl = fail?dbg_fail:dbg_debug;
+
+ if (!cmd)
+ return;
+
+ if (cmd->error == 0) {
+
+ dbg(host, dbglvl, "CMD[OK] %s R0:0x%08x\n",
+ host->dbgmsg_cmd, cmd->resp[0]);
+ } else {
+ dbg(host, dbglvl, "CMD[%s] %s Status:%s\n",
+ mmc_err2str(cmd->error), host->dbgmsg_cmd,
+ host->status);
+ }
+
+ if (!cmd->data)
+ return;
+
+ if (cmd->data->error == 0) {
+ dbg(host, dbglvl, "DAT[%s] %s\n",
+ mmc_err2str(cmd->data->error), host->dbgmsg_dat);
+ } else {
+ dbg(host, dbglvl, "DAT[%s] %s DCNT:0x%08x\n",
+ mmc_err2str(cmd->data->error), host->dbgmsg_dat,
+ readl(host->base + S3C2410_SDIDCNT));
+ }
+}
+#endif
+
+static inline u32 enable_imask(struct s3cmci_host *host, u32 imask)
+{
+ u32 newmask;
+
+ newmask = readl(host->base + host->sdiimsk);
+ newmask |= imask;
+
+ writel(newmask, host->base + host->sdiimsk);
+
+ return newmask;
+}
+
+static inline u32 disable_imask(struct s3cmci_host *host, u32 imask)
+{
+ u32 newmask;
+
+ newmask = readl(host->base + host->sdiimsk);
+ newmask &= ~imask;
+
+ writel(newmask, host->base + host->sdiimsk);
+
+ return newmask;
+}
+
+static inline void clear_imask(struct s3cmci_host *host)
+{
+ writel(0, host->base + host->sdiimsk);
+}
+
+static inline int get_data_buffer(struct s3cmci_host *host,
+ u32 *words, u32 **pointer)
+{
+ struct scatterlist *sg;
+
+ if (host->pio_active == XFER_NONE)
+ return -EINVAL;
+
+ if ((!host->mrq) || (!host->mrq->data))
+ return -EINVAL;
+
+ if (host->pio_sgptr >= host->mrq->data->sg_len) {
+ dbg(host, dbg_debug, "no more buffers (%i/%i)\n",
+ host->pio_sgptr, host->mrq->data->sg_len);
+ return -EBUSY;
+ }
+ sg = &host->mrq->data->sg[host->pio_sgptr];
+
+ *words = sg->length >> 2;
+ *pointer = page_address(sg_page(sg)) + sg->offset;
+
+ host->pio_sgptr++;
+
+ dbg(host, dbg_sg, "new buffer (%i/%i)\n",
+ host->pio_sgptr, host->mrq->data->sg_len);
+
+ return 0;
+}
+
+#define FIFO_FILL(host) ((readl(host->base + S3C2410_SDIFSTA) & \
+ S3C2410_SDIFSTA_COUNTMASK) >> 2)
+#define FIFO_FREE(host) ((63 - (readl(host->base + S3C2410_SDIFSTA) \
+ & S3C2410_SDIFSTA_COUNTMASK)) >> 2)
+
+static inline void do_pio_read(struct s3cmci_host *host)
+{
+ int res;
+ u32 fifo;
+ void __iomem *from_ptr;
+
+ /* write real prescaler to host, it might be set slow to fix */
+ writel(host->prescaler, host->base + S3C2410_SDIPRE);
+
+ from_ptr = host->base + host->sdidata;
+
+ while ((fifo = FIFO_FILL(host))) {
+ if (!host->pio_words) {
+ res = get_data_buffer(host, &host->pio_words,
+ &host->pio_ptr);
+ if (res) {
+ host->pio_active = XFER_NONE;
+ host->complete_what = COMPLETION_FINALIZE;
+
+ dbg(host, dbg_pio, "pio_read(): "
+ "complete (no more data).\n");
+ return;
+ }
+
+ dbg(host, dbg_pio, "pio_read(): new target: "
+ "[%i]@[%p]\n", host->pio_words, host->pio_ptr);
+ }
+
+ dbg(host, dbg_pio, "pio_read(): fifo:[%02i] "
+ "buffer:[%03i] dcnt:[%08X]\n", fifo, host->pio_words,
+ readl(host->base + S3C2410_SDIDCNT));
+
+ if (fifo > host->pio_words)
+ fifo = host->pio_words;
+
+ host->pio_words -= fifo;
+ host->pio_count += fifo;
+
+ while (fifo--)
+ *(host->pio_ptr++) = readl(from_ptr);
+ }
+
+ if (!host->pio_words) {
+ res = get_data_buffer(host, &host->pio_words, &host->pio_ptr);
+ if (res) {
+ dbg(host, dbg_pio, "pio_read(): "
+ "complete (no more buffers).\n");
+ host->pio_active = XFER_NONE;
+ host->complete_what = COMPLETION_FINALIZE;
+
+ return;
+ }
+ }
+
+ enable_imask(host, S3C2410_SDIIMSK_RXFIFOHALF
+ | S3C2410_SDIIMSK_RXFIFOLAST);
+}
+
+static inline void do_pio_write(struct s3cmci_host *host)
+{
+ int res;
+ u32 fifo;
+
+ void __iomem *to_ptr;
+
+ to_ptr = host->base + host->sdidata;
+
+ while ((fifo = FIFO_FREE(host))) {
+ if (!host->pio_words) {
+ res = get_data_buffer(host, &host->pio_words,
+ &host->pio_ptr);
+ if (res) {
+ dbg(host, dbg_pio, "pio_write(): "
+ "complete (no more data).\n");
+ host->pio_active = XFER_NONE;
+
+ return;
+ }
+
+ dbg(host, dbg_pio, "pio_write(): "
+ "new source: [%i]@[%p]\n",
+ host->pio_words, host->pio_ptr);
+
+ }
+
+ if (fifo > host->pio_words)
+ fifo = host->pio_words;
+
+ host->pio_words -= fifo;
+ host->pio_count += fifo;
+
+ while (fifo--)
+ writel(*(host->pio_ptr++), to_ptr);
+ }
+
+ enable_imask(host, S3C2410_SDIIMSK_TXFIFOHALF);
+}
+
+static void pio_tasklet(unsigned long data)
+{
+ struct s3cmci_host *host = (struct s3cmci_host *) data;
+
+ disable_irq(host->irq);
+
+ if (host->pio_active == XFER_WRITE)
+ do_pio_write(host);
+
+ if (host->pio_active == XFER_READ)
+ do_pio_read(host);
+
+ if (host->complete_what == COMPLETION_FINALIZE) {
+ clear_imask(host);
+ if (host->pio_active != XFER_NONE) {
+ dbg(host, dbg_err, "unfinished %s "
+ "- pio_count:[%u] pio_words:[%u]\n",
+ (host->pio_active == XFER_READ)?"read":"write",
+ host->pio_count, host->pio_words);
+
+ host->mrq->data->error = -EIO;
+ }
+
+ finalize_request(host);
+ } else
+ enable_irq(host->irq);
+}
+
+/*
+ * ISR for SDI Interface IRQ
+ * Communication between driver and ISR works as follows:
+ * host->mrq points to current request
+ * host->complete_what tells ISR when the request is considered done
+ * COMPLETION_CMDSENT when the command was sent
+ * COMPLETION_RSPFIN when a response was received
+ * COMPLETION_XFERFINISH when the data transfer is finished
+ * COMPLETION_XFERFINISH_RSPFIN both of the above.
+ * host->complete_request is the completion-object the driver waits for
+ *
+ * 1) Driver sets up host->mrq and host->complete_what
+ * 2) Driver prepares the transfer
+ * 3) Driver enables interrupts
+ * 4) Driver starts transfer
+ * 5) Driver waits for host->complete_rquest
+ * 6) ISR checks for request status (errors and success)
+ * 6) ISR sets host->mrq->cmd->error and host->mrq->data->error
+ * 7) ISR completes host->complete_request
+ * 8) ISR disables interrupts
+ * 9) Driver wakes up and takes care of the request
+ *
+ * Note: "->error"-fields are expected to be set to 0 before the request
+ * was issued by mmc.c - therefore they are only set, when an error
+ * contition comes up
+ */
+
+static irqreturn_t s3cmci_irq(int irq, void *dev_id)
+{
+ struct s3cmci_host *host;
+ struct mmc_command *cmd;
+ u32 mci_csta, mci_dsta, mci_fsta, mci_dcnt, mci_imsk;
+ u32 mci_cclear, mci_dclear;
+ unsigned long iflags;
+
+ host = (struct s3cmci_host *)dev_id;
+
+ spin_lock_irqsave(&host->complete_lock, iflags);
+
+ mci_csta = readl(host->base + S3C2410_SDICMDSTAT);
+ mci_dsta = readl(host->base + S3C2410_SDIDSTA);
+ mci_dcnt = readl(host->base + S3C2410_SDIDCNT);
+ mci_fsta = readl(host->base + S3C2410_SDIFSTA);
+ mci_imsk = readl(host->base + host->sdiimsk);
+ mci_cclear = 0;
+ mci_dclear = 0;
+
+ if ((host->complete_what == COMPLETION_NONE) ||
+ (host->complete_what == COMPLETION_FINALIZE)) {
+ host->status = "nothing to complete";
+ clear_imask(host);
+ goto irq_out;
+ }
+
+ if (!host->mrq) {
+ host->status = "no active mrq";
+ clear_imask(host);
+ goto irq_out;
+ }
+
+ cmd = host->cmd_is_stop?host->mrq->stop:host->mrq->cmd;
+
+ if (!cmd) {
+ host->status = "no active cmd";
+ clear_imask(host);
+ goto irq_out;
+ }
+
+ if (!host->dodma) {
+ if ((host->pio_active == XFER_WRITE) &&
+ (mci_fsta & S3C2410_SDIFSTA_TFDET)) {
+
+ disable_imask(host, S3C2410_SDIIMSK_TXFIFOHALF);
+ tasklet_schedule(&host->pio_tasklet);
+ host->status = "pio tx";
+ }
+
+ if ((host->pio_active == XFER_READ) &&
+ (mci_fsta & S3C2410_SDIFSTA_RFDET)) {
+
+ disable_imask(host, S3C2410_SDIIMSK_RXFIFOHALF |
+ S3C2410_SDIIMSK_RXFIFOLAST);
+
+ tasklet_schedule(&host->pio_tasklet);
+ host->status = "pio rx";
+ }
+ }
+
+ if (mci_csta & S3C2410_SDICMDSTAT_CMDTIMEOUT) {
+ cmd->error = -ETIMEDOUT;
+ host->status = "error: command timeout";
+ goto fail_transfer;
+ }
+
+ if (mci_csta & S3C2410_SDICMDSTAT_CMDSENT) {
+ if (host->complete_what == COMPLETION_CMDSENT) {
+ host->status = "ok: command sent";
+ goto close_transfer;
+ }
+
+ mci_cclear |= S3C2410_SDICMDSTAT_CMDSENT;
+ }
+
+ if (mci_csta & S3C2410_SDICMDSTAT_CRCFAIL) {
+ if (cmd->flags & MMC_RSP_CRC) {
+ if (host->mrq->cmd->flags & MMC_RSP_136) {
+ dbg(host, dbg_irq, "fixup for chip bug: "
+ "ignore CRC fail with long rsp\n");
+ } else {
+ cmd->error = -EILSEQ;
+ host->status = "error: bad command crc";
+ goto fail_transfer;
+ }
+ }
+
+ mci_cclear |= S3C2410_SDICMDSTAT_CRCFAIL;
+ }
+
+ if (mci_csta & S3C2410_SDICMDSTAT_RSPFIN) {
+ if (host->complete_what == COMPLETION_RSPFIN) {
+ host->status = "ok: command response received";
+ goto close_transfer;
+ }
+
+ if (host->complete_what == COMPLETION_XFERFINISH_RSPFIN)
+ host->complete_what = COMPLETION_XFERFINISH;
+
+ mci_cclear |= S3C2410_SDICMDSTAT_RSPFIN;
+ }
+
+ /* errors handled after this point are only relevant
+ when a data transfer is in progress */
+
+ if (!cmd->data)
+ goto clear_status_bits;
+
+ /* Check for FIFO failure */
+ if (host->is2440) {
+ if (mci_fsta & S3C2440_SDIFSTA_FIFOFAIL) {
+ host->mrq->data->error = -EIO;
+ host->status = "error: 2440 fifo failure";
+ goto fail_transfer;
+ }
+ } else {
+ if (mci_dsta & S3C2410_SDIDSTA_FIFOFAIL) {
+ cmd->data->error = -EIO;
+ host->status = "error: fifo failure";
+ goto fail_transfer;
+ }
+ }
+
+ if (mci_dsta & S3C2410_SDIDSTA_RXCRCFAIL) {
+ cmd->data->error = -EILSEQ;
+ host->status = "error: bad data crc (outgoing)";
+ goto fail_transfer;
+ }
+
+ if (mci_dsta & S3C2410_SDIDSTA_CRCFAIL) {
+ cmd->data->error = -EIO;
+ host->status = "error: bad data crc (incoming)";
+ goto fail_transfer;
+ }
+
+ if (mci_dsta & S3C2410_SDIDSTA_DATATIMEOUT) {
+ cmd->data->error = -ETIMEDOUT;
+ host->status = "error: data timeout";
+ goto fail_transfer;
+ }
+
+ if (mci_dsta & S3C2410_SDIDSTA_XFERFINISH) {
+ if (host->complete_what == COMPLETION_XFERFINISH) {
+ host->status = "ok: data transfer completed";
+ goto close_transfer;
+ }
+
+ if (host->complete_what == COMPLETION_XFERFINISH_RSPFIN)
+ host->complete_what = COMPLETION_RSPFIN;
+
+ mci_dclear |= S3C2410_SDIDSTA_XFERFINISH;
+ }
+
+clear_status_bits:
+ writel(mci_cclear, host->base + S3C2410_SDICMDSTAT);
+ writel(mci_dclear, host->base + S3C2410_SDIDSTA);
+
+ goto irq_out;
+
+fail_transfer:
+ host->pio_active = XFER_NONE;
+
+close_transfer:
+ host->complete_what = COMPLETION_FINALIZE;
+
+ clear_imask(host);
+ tasklet_schedule(&host->pio_tasklet);
+
+ goto irq_out;
+
+irq_out:
+ dbg(host, dbg_irq, "csta:0x%08x dsta:0x%08x "
+ "fsta:0x%08x dcnt:0x%08x status:%s.\n",
+ mci_csta, mci_dsta, mci_fsta,
+ mci_dcnt, host->status);
+
+ spin_unlock_irqrestore(&host->complete_lock, iflags);
+ return IRQ_HANDLED;
+
+}
+
+/*
+ * ISR for the CardDetect Pin
+*/
+
+static irqreturn_t s3cmci_irq_cd(int irq, void *dev_id)
+{
+ struct s3cmci_host *host = (struct s3cmci_host *)dev_id;
+
+ dbg(host, dbg_irq, "card detect\n");
+
+ mmc_detect_change(host->mmc, 500);
+
+ return IRQ_HANDLED;
+}
+
+void s3cmci_dma_done_callback(struct s3c2410_dma_chan *dma_ch, void *buf_id,
+ int size, enum s3c2410_dma_buffresult result)
+{
+ unsigned long iflags;
+ u32 mci_csta, mci_dsta, mci_fsta, mci_dcnt;
+ struct s3cmci_host *host = (struct s3cmci_host *)buf_id;
+
+ mci_csta = readl(host->base + S3C2410_SDICMDSTAT);
+ mci_dsta = readl(host->base + S3C2410_SDIDSTA);
+ mci_fsta = readl(host->base + S3C2410_SDIFSTA);
+ mci_dcnt = readl(host->base + S3C2410_SDIDCNT);
+
+ if ((!host->mrq) || (!host->mrq) || (!host->mrq->data))
+ return;
+
+ if (!host->dmatogo)
+ return;
+
+ spin_lock_irqsave(&host->complete_lock, iflags);
+
+ if (result != S3C2410_RES_OK) {
+ dbg(host, dbg_fail, "DMA FAILED: csta=0x%08x dsta=0x%08x "
+ "fsta=0x%08x dcnt:0x%08x result:0x%08x toGo:%u\n",
+ mci_csta, mci_dsta, mci_fsta,
+ mci_dcnt, result, host->dmatogo);
+
+ goto fail_request;
+ }
+
+ host->dmatogo--;
+ if (host->dmatogo) {
+ dbg(host, dbg_dma, "DMA DONE Size:%i DSTA:[%08x] "
+ "DCNT:[%08x] toGo:%u\n",
+ size, mci_dsta, mci_dcnt, host->dmatogo);
+
+ goto out;
+ }
+
+ dbg(host, dbg_dma, "DMA FINISHED Size:%i DSTA:%08x DCNT:%08x\n",
+ size, mci_dsta, mci_dcnt);
+
+ host->complete_what = COMPLETION_FINALIZE;
+
+out:
+ tasklet_schedule(&host->pio_tasklet);
+ spin_unlock_irqrestore(&host->complete_lock, iflags);
+ return;
+
+
+fail_request:
+ host->mrq->data->error = -EIO;
+ host->complete_what = COMPLETION_FINALIZE;
+ writel(0, host->base + host->sdiimsk);
+ goto out;
+
+}
+
+static void finalize_request(struct s3cmci_host *host)
+{
+ struct mmc_request *mrq = host->mrq;
+ struct mmc_command *cmd = host->cmd_is_stop?mrq->stop:mrq->cmd;
+ int debug_as_failure = 0;
+
+ if (host->complete_what != COMPLETION_FINALIZE)
+ return;
+
+ if (!mrq)
+ return;
+
+ if (cmd->data && (cmd->error == 0) &&
+ (cmd->data->error == 0)) {
+
+ if (host->dodma && (!host->dma_complete)) {
+ dbg(host, dbg_dma, "DMA Missing!\n");
+ return;
+ }
+ }
+
+ /* Read response */
+ cmd->resp[0] = readl(host->base + S3C2410_SDIRSP0);
+ cmd->resp[1] = readl(host->base + S3C2410_SDIRSP1);
+ cmd->resp[2] = readl(host->base + S3C2410_SDIRSP2);
+ cmd->resp[3] = readl(host->base + S3C2410_SDIRSP3);
+
+ /* reset clock speed, as it could still be set low for */
+ writel(host->prescaler, host->base + S3C2410_SDIPRE);
+
+ if (cmd->error)
+ debug_as_failure = 1;
+
+ if (cmd->data && cmd->data->error)
+ debug_as_failure = 1;
+
+#ifdef CONFIG_MMC_DEBUG
+ dbg_dumpcmd(host, cmd, debug_as_failure);
+#endif
+ /* Cleanup controller */
+ writel(0, host->base + S3C2410_SDICMDARG);
+ writel(S3C2410_SDIDCON_STOP, host->base + S3C2410_SDIDCON);
+ writel(0, host->base + S3C2410_SDICMDCON);
+ writel(0, host->base + host->sdiimsk);
+
+ if (cmd->data && cmd->error)
+ cmd->data->error = cmd->error;
+
+ if (cmd->data && cmd->data->stop && (!host->cmd_is_stop)) {
+ host->cmd_is_stop = 1;
+ s3cmci_send_request(host->mmc);
+ return;
+ }
+
+ /* If we have no data transfer we are finished here */
+ if (!mrq->data)
+ goto request_done;
+
+ /* Calulate the amout of bytes transfer, but only if there was
+ * no error */
+ if (mrq->data->error == 0)
+ mrq->data->bytes_xfered =
+ (mrq->data->blocks * mrq->data->blksz);
+ else
+ mrq->data->bytes_xfered = 0;
+
+ /* If we had an error while transfering data we flush the
+ * DMA channel and the fifo to clear out any garbage */
+ if (mrq->data->error) {
+ if (host->dodma)
+ s3c2410_dma_ctrl(host->dma, S3C2410_DMAOP_FLUSH);
+
+ if (host->is2440) {
+ /* Clear failure register and reset fifo */
+ writel(S3C2440_SDIFSTA_FIFORESET |
+ S3C2440_SDIFSTA_FIFOFAIL,
+ host->base + S3C2410_SDIFSTA);
+ } else {
+ u32 mci_con;
+
+ /* reset fifo */
+ mci_con = readl(host->base + S3C2410_SDICON);
+ mci_con |= S3C2410_SDICON_FIFORESET;
+
+ writel(mci_con, host->base + S3C2410_SDICON);
+ }
+ }
+
+request_done:
+ host->complete_what = COMPLETION_NONE;
+ host->mrq = NULL;
+ mmc_request_done(host->mmc, mrq);
+}
+
+
+void s3cmci_dma_setup(struct s3cmci_host *host, enum s3c2410_dmasrc source)
+{
+ static int setup_ok;
+ static enum s3c2410_dmasrc last_source = -1;
+
+ if (last_source == source)
+ return;
+
+ last_source = source;
+
+ s3c2410_dma_devconfig(host->dma, source, 3,
+ host->mem->start + host->sdidata);
+
+ if (!setup_ok) {
+ s3c2410_dma_config(host->dma, 4,
+ (S3C2410_DCON_HWTRIG | S3C2410_DCON_CH0_SDI));
+ s3c2410_dma_set_buffdone_fn(host->dma,
+ s3cmci_dma_done_callback);
+ s3c2410_dma_setflags(host->dma, S3C2410_DMAF_AUTOSTART);
+ setup_ok = 1;
+ }
+}
+
+static void s3cmci_send_command(struct s3cmci_host *host,
+ struct mmc_command *cmd)
+{
+ u32 ccon, imsk;
+
+ imsk = S3C2410_SDIIMSK_CRCSTATUS | S3C2410_SDIIMSK_CMDTIMEOUT |
+ S3C2410_SDIIMSK_RESPONSEND | S3C2410_SDIIMSK_CMDSENT |
+ S3C2410_SDIIMSK_RESPONSECRC;
+
+ enable_imask(host, imsk);
+
+ if (cmd->data)
+ host->complete_what = COMPLETION_XFERFINISH_RSPFIN;
+ else if (cmd->flags & MMC_RSP_PRESENT)
+ host->complete_what = COMPLETION_RSPFIN;
+ else
+ host->complete_what = COMPLETION_CMDSENT;
+
+ writel(cmd->arg, host->base + S3C2410_SDICMDARG);
+
+ ccon = cmd->opcode & S3C2410_SDICMDCON_INDEX;
+ ccon |= S3C2410_SDICMDCON_SENDERHOST | S3C2410_SDICMDCON_CMDSTART;
+
+ if (cmd->flags & MMC_RSP_PRESENT)
+ ccon |= S3C2410_SDICMDCON_WAITRSP;
+
+ if (cmd->flags & MMC_RSP_136)
+ ccon |= S3C2410_SDICMDCON_LONGRSP;
+
+ writel(ccon, host->base + S3C2410_SDICMDCON);
+}
+
+static int s3cmci_setup_data(struct s3cmci_host *host, struct mmc_data *data)
+{
+ u32 dcon, imsk, stoptries = 3;
+
+ /* write DCON register */
+
+ if (!data) {
+ writel(0, host->base + S3C2410_SDIDCON);
+ return 0;
+ }
+
+ while (readl(host->base + S3C2410_SDIDSTA) &
+ (S3C2410_SDIDSTA_TXDATAON | S3C2410_SDIDSTA_RXDATAON)) {
+
+ dbg(host, dbg_err,
+ "mci_setup_data() transfer stillin progress.\n");
+
+ writel(S3C2410_SDIDCON_STOP, host->base + S3C2410_SDIDCON);
+ s3cmci_reset(host);
+
+ if (0 == (stoptries--)) {
+#ifdef CONFIG_MMC_DEBUG
+ dbg_dumpregs(host, "DRF");
+#endif
+
+ return -EINVAL;
+ }
+ }
+
+ dcon = data->blocks & S3C2410_SDIDCON_BLKNUM_MASK;
+
+ if (host->dodma)
+ dcon |= S3C2410_SDIDCON_DMAEN;
+
+ if (host->bus_width == MMC_BUS_WIDTH_4)
+ dcon |= S3C2410_SDIDCON_WIDEBUS;
+
+ if (!(data->flags & MMC_DATA_STREAM))
+ dcon |= S3C2410_SDIDCON_BLOCKMODE;
+
+ if (data->flags & MMC_DATA_WRITE) {
+ dcon |= S3C2410_SDIDCON_TXAFTERRESP;
+ dcon |= S3C2410_SDIDCON_XFER_TXSTART;
+ }
+
+ if (data->flags & MMC_DATA_READ) {
+ dcon |= S3C2410_SDIDCON_RXAFTERCMD;
+ dcon |= S3C2410_SDIDCON_XFER_RXSTART;
+ }
+
+ if (host->is2440) {
+ dcon |= S3C2440_SDIDCON_DS_WORD;
+ dcon |= S3C2440_SDIDCON_DATSTART;
+ }
+
+ writel(dcon, host->base + S3C2410_SDIDCON);
+
+ /* write BSIZE register */
+
+ writel(data->blksz, host->base + S3C2410_SDIBSIZE);
+
+ /* add to IMASK register */
+ imsk = S3C2410_SDIIMSK_FIFOFAIL | S3C2410_SDIIMSK_DATACRC |
+ S3C2410_SDIIMSK_DATATIMEOUT | S3C2410_SDIIMSK_DATAFINISH;
+
+ enable_imask(host, imsk);
+
+ /* write TIMER register */
+
+ if (host->is2440) {
+ writel(0x007FFFFF, host->base + S3C2410_SDITIMER);
+ } else {
+ writel(0x0000FFFF, host->base + S3C2410_SDITIMER);
+
+ /* FIX: set slow clock to prevent timeouts on read */
+ if (data->flags & MMC_DATA_READ)
+ writel(0xFF, host->base + S3C2410_SDIPRE);
+ }
+
+ return 0;
+}
+
+static int s3cmci_prepare_pio(struct s3cmci_host *host, struct mmc_data *data)
+{
+ int rw = (data->flags & MMC_DATA_WRITE)?1:0;
+
+ if (rw != ((data->flags & MMC_DATA_READ)?0:1))
+ return -EINVAL;
+
+ host->pio_sgptr = 0;
+ host->pio_words = 0;
+ host->pio_count = 0;
+ host->pio_active = rw?XFER_WRITE:XFER_READ;
+
+ if (rw) {
+ do_pio_write(host);
+ enable_imask(host, S3C2410_SDIIMSK_TXFIFOHALF);
+ } else {
+ enable_imask(host, S3C2410_SDIIMSK_RXFIFOHALF
+ | S3C2410_SDIIMSK_RXFIFOLAST);
+ }
+
+ return 0;
+}
+
+static int s3cmci_prepare_dma(struct s3cmci_host *host, struct mmc_data *data)
+{
+ int dma_len, i;
+
+ int rw = (data->flags & MMC_DATA_WRITE)?1:0;
+
+ if (rw != ((data->flags & MMC_DATA_READ)?0:1))
+ return -EINVAL;
+
+ s3cmci_dma_setup(host, rw?S3C2410_DMASRC_MEM:S3C2410_DMASRC_HW);
+ s3c2410_dma_ctrl(host->dma, S3C2410_DMAOP_FLUSH);
+
+ dma_len = dma_map_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
+ (rw)?DMA_TO_DEVICE:DMA_FROM_DEVICE);
+
+
+ if (dma_len == 0)
+ return -ENOMEM;
+
+ host->dma_complete = 0;
+ host->dmatogo = dma_len;
+
+ for (i = 0; i < dma_len; i++) {
+ int res;
+
+ dbg(host, dbg_dma, "enqueue %i:%u@%u\n", i,
+ sg_dma_address(&data->sg[i]),
+ sg_dma_len(&data->sg[i]));
+
+ res = s3c2410_dma_enqueue(host->dma, (void *) host,
+ sg_dma_address(&data->sg[i]),
+ sg_dma_len(&data->sg[i]));
+
+ if (res) {
+ s3c2410_dma_ctrl(host->dma, S3C2410_DMAOP_FLUSH);
+ return -EBUSY;
+ }
+ }
+
+ s3c2410_dma_ctrl(host->dma, S3C2410_DMAOP_START);
+
+ return 0;
+}
+
+static void s3cmci_send_request(struct mmc_host *mmc)
+{
+ struct s3cmci_host *host = mmc_priv(mmc);
+ struct mmc_request *mrq = host->mrq;
+ struct mmc_command *cmd = host->cmd_is_stop?mrq->stop:mrq->cmd;
+
+ host->ccnt++;
+#ifdef CONFIG_MMC_DEBUG
+ prepare_dbgmsg(host, cmd, host->cmd_is_stop);
+#endif
+ /* clear command, data and fifo status registers;
+ * Fifo clear only necessary on 2440, but doesn't hurt on 2410 */
+ writel(0xFFFFFFFF, host->base + S3C2410_SDICMDSTAT);
+ writel(0xFFFFFFFF, host->base + S3C2410_SDIDSTA);
+ writel(0xFFFFFFFF, host->base + S3C2410_SDIFSTA);
+
+ if (cmd->data) {
+ int res;
+ res = s3cmci_setup_data(host, cmd->data);
+
+ host->dcnt++;
+
+ if (res) {
+ cmd->error = -EIO;
+ cmd->data->error = -EIO;
+
+ mmc_request_done(mmc, mrq);
+ return;
+ }
+
+
+ if (host->dodma)
+ res = s3cmci_prepare_dma(host, cmd->data);
+ else
+ res = s3cmci_prepare_pio(host, cmd->data);
+
+ if (res) {
+ cmd->error = -EIO;
+ cmd->data->error = -EIO;
+
+ mmc_request_done(mmc, mrq);
+ return;
+ }
+
+ }
+
+ s3cmci_send_command(host, cmd);
+ enable_irq(host->irq);
+}
+
+static void s3cmci_request(struct mmc_host *mmc, struct mmc_request *mrq)
+{
+ struct s3cmci_host *host = mmc_priv(mmc);
+
+ host->cmd_is_stop = 0;
+ host->mrq = mrq;
+
+ s3cmci_send_request(mmc);
+}
+
+static void s3cmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
+{
+ struct s3cmci_host *host = mmc_priv(mmc);
+ u32 mci_psc, mci_con;
+
+ /* Set power */
+ mci_con = readl(host->base + S3C2410_SDICON);
+ switch (ios->power_mode) {
+ case MMC_POWER_ON:
+ case MMC_POWER_UP:
+ s3c2410_gpio_cfgpin(S3C2410_GPE5, S3C2410_GPE5_SDCLK);
+ s3c2410_gpio_cfgpin(S3C2410_GPE6, S3C2410_GPE6_SDCMD);
+ s3c2410_gpio_cfgpin(S3C2410_GPE7, S3C2410_GPE7_SDDAT0);
+ s3c2410_gpio_cfgpin(S3C2410_GPE8, S3C2410_GPE8_SDDAT1);
+ s3c2410_gpio_cfgpin(S3C2410_GPE9, S3C2410_GPE9_SDDAT2);
+ s3c2410_gpio_cfgpin(S3C2410_GPE10, S3C2410_GPE10_SDDAT3);
+
+ if (host->pdata->set_power)
+ host->pdata->set_power(ios->power_mode, ios->vdd);
+
+ if (!host->is2440)
+ mci_con |= S3C2410_SDICON_FIFORESET;
+
+ break;
+
+ case MMC_POWER_OFF:
+ default:
+ s3c2410_gpio_setpin(S3C2410_GPE5, 0);
+ s3c2410_gpio_cfgpin(S3C2410_GPE5, S3C2410_GPE5_OUTP);
+
+ if (host->pdata->set_power)
+ host->pdata->set_power(ios->power_mode, ios->vdd);
+
+ if (host->is2440)
+ mci_con |= S3C2440_SDICON_SDRESET;
+
+ break;
+ }
+
+ /* Set clock */
+ for (mci_psc = 0; mci_psc < 255; mci_psc++) {
+ host->real_rate = host->clk_rate / (host->clk_div*(mci_psc+1));
+
+ if (host->real_rate <= ios->clock)
+ break;
+ }
+
+ if (mci_psc > 255)
+ mci_psc = 255;
+ host->prescaler = mci_psc;
+
+ writel(host->prescaler, host->base + S3C2410_SDIPRE);
+
+ /* If requested clock is 0, real_rate will be 0, too */
+ if (ios->clock == 0)
+ host->real_rate = 0;
+
+ /* Set CLOCK_ENABLE */
+ if (ios->clock)
+ mci_con |= S3C2410_SDICON_CLOCKTYPE;
+ else
+ mci_con &= ~S3C2410_SDICON_CLOCKTYPE;
+
+ writel(mci_con, host->base + S3C2410_SDICON);
+
+ if ((ios->power_mode == MMC_POWER_ON)
+ || (ios->power_mode == MMC_POWER_UP)) {
+
+ dbg(host, dbg_conf, "running at %lukHz (requested: %ukHz).\n",
+ host->real_rate/1000, ios->clock/1000);
+ } else {
+ dbg(host, dbg_conf, "powered down.\n");
+ }
+
+ host->bus_width = ios->bus_width;
+
+}
+
+static void s3cmci_reset(struct s3cmci_host *host)
+{
+ u32 con = readl(host->base + S3C2410_SDICON);
+
+ con |= S3C2440_SDICON_SDRESET;
+
+ writel(con, host->base + S3C2410_SDICON);
+}
+
+static int s3cmci_get_ro(struct mmc_host *mmc)
+{
+ struct s3cmci_host *host = mmc_priv(mmc);
+
+ if (host->pdata->gpio_wprotect == 0)
+ return 0;
+
+ return s3c2410_gpio_getpin(host->pdata->gpio_wprotect);
+}
+
+static struct mmc_host_ops s3cmci_ops = {
+ .request = s3cmci_request,
+ .set_ios = s3cmci_set_ios,
+ .get_ro = s3cmci_get_ro,
+};
+
+static struct s3c24xx_mci_pdata s3cmci_def_pdata = {
+ .gpio_detect = 0,
+ .set_power = NULL,
+ .ocr_avail = MMC_VDD_32_33,
+};
+
+static int s3cmci_probe(struct platform_device *pdev, int is2440)
+{
+ struct mmc_host *mmc;
+ struct s3cmci_host *host;
+
+ int ret;
+
+ mmc = mmc_alloc_host(sizeof(struct s3cmci_host), &pdev->dev);
+ if (!mmc) {
+ ret = -ENOMEM;
+ goto probe_out;
+ }
+
+ host = mmc_priv(mmc);
+ host->mmc = mmc;
+ host->pdev = pdev;
+
+ host->pdata = pdev->dev.platform_data;
+ if (!host->pdata) {
+ pdev->dev.platform_data = &s3cmci_def_pdata;
+ host->pdata = &s3cmci_def_pdata;
+ }
+
+ spin_lock_init(&host->complete_lock);
+ tasklet_init(&host->pio_tasklet, pio_tasklet, (unsigned long) host);
+ if (is2440) {
+ host->is2440 = 1;
+ host->sdiimsk = S3C2440_SDIIMSK;
+ host->sdidata = S3C2440_SDIDATA;
+ host->clk_div = 1;
+ } else {
+ host->is2440 = 0;
+ host->sdiimsk = S3C2410_SDIIMSK;
+ host->sdidata = S3C2410_SDIDATA;
+ host->clk_div = 2;
+ }
+ host->dodma = 0;
+ host->complete_what = COMPLETION_NONE;
+ host->pio_active = XFER_NONE;
+
+ host->dma = S3CMCI_DMA;
+ host->irq_cd = s3c2410_gpio_getirq(host->pdata->gpio_detect);
+ s3c2410_gpio_cfgpin(host->pdata->gpio_detect, S3C2410_GPIO_IRQ);
+
+ host->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!host->mem) {
+ dev_err(&pdev->dev,
+ "failed to get io memory region resouce.\n");
+
+ ret = -ENOENT;
+ goto probe_free_host;
+ }
+
+ host->mem = request_mem_region(host->mem->start,
+ RESSIZE(host->mem), pdev->name);
+
+ if (!host->mem) {
+ dev_err(&pdev->dev, "failed to request io memory region.\n");
+ ret = -ENOENT;
+ goto probe_free_host;
+ }
+
+ host->base = ioremap(host->mem->start, RESSIZE(host->mem));
+ if (host->base == 0) {
+ dev_err(&pdev->dev, "failed to ioremap() io memory region.\n");
+ ret = -EINVAL;
+ goto probe_free_mem_region;
+ }
+
+ host->irq = platform_get_irq(pdev, 0);
+ if (host->irq == 0) {
+ dev_err(&pdev->dev, "failed to get interrupt resouce.\n");
+ ret = -EINVAL;
+ goto probe_iounmap;
+ }
+
+ if (request_irq(host->irq, s3cmci_irq, 0, DRIVER_NAME, host)) {
+ dev_err(&pdev->dev, "failed to request mci interrupt.\n");
+ ret = -ENOENT;
+ goto probe_iounmap;
+ }
+
+ disable_irq(host->irq);
+
+ s3c2410_gpio_cfgpin(host->pdata->gpio_detect, S3C2410_GPIO_IRQ);
+ set_irq_type(host->irq_cd, IRQT_BOTHEDGE);
+
+ if (request_irq(host->irq_cd, s3cmci_irq_cd, 0, DRIVER_NAME, host)) {
+ dev_err(&pdev->dev,
+ "failed to request card detect interrupt.\n");
+
+ ret = -ENOENT;
+ goto probe_free_irq;
+ }
+
+ if (host->pdata->gpio_wprotect)
+ s3c2410_gpio_cfgpin(host->pdata->gpio_wprotect,
+ S3C2410_GPIO_INPUT);
+
+ if (s3c2410_dma_request(S3CMCI_DMA, &s3cmci_dma_client, NULL)) {
+ dev_err(&pdev->dev, "unable to get DMA channel.\n");
+ ret = -EBUSY;
+ goto probe_free_irq_cd;
+ }
+
+ host->clk = clk_get(&pdev->dev, "sdi");
+ if (IS_ERR(host->clk)) {
+ dev_err(&pdev->dev, "failed to find clock source.\n");
+ ret = PTR_ERR(host->clk);
+ host->clk = NULL;
+ goto probe_free_host;
+ }
+
+ ret = clk_enable(host->clk);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to enable clock source.\n");
+ goto clk_free;
+ }
+
+ host->clk_rate = clk_get_rate(host->clk);
+
+ mmc->ops = &s3cmci_ops;
+ mmc->ocr_avail = host->pdata->ocr_avail;
+ mmc->caps = MMC_CAP_4_BIT_DATA;
+ mmc->f_min = host->clk_rate / (host->clk_div * 256);
+ mmc->f_max = host->clk_rate / host->clk_div;
+
+ mmc->max_blk_count = 4095;
+ mmc->max_blk_size = 4095;
+ mmc->max_req_size = 4095 * 512;
+ mmc->max_seg_size = mmc->max_req_size;
+
+ mmc->max_phys_segs = 128;
+ mmc->max_hw_segs = 128;
+
+ dbg(host, dbg_debug, "probe: mode:%s mapped mci_base:%p irq:%u "
+ "irq_cd:%u dma:%u.\n", (host->is2440?"2440":""),
+ host->base, host->irq, host->irq_cd, host->dma);
+
+ ret = mmc_add_host(mmc);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to add mmc host.\n");
+ goto free_dmabuf;
+ }
+
+ platform_set_drvdata(pdev, mmc);
+
+ dev_info(&pdev->dev, "initialisation done.\n");
+ return 0;
+
+ free_dmabuf:
+ clk_disable(host->clk);
+
+ clk_free:
+ clk_put(host->clk);
+
+ probe_free_irq_cd:
+ free_irq(host->irq_cd, host);
+
+ probe_free_irq:
+ free_irq(host->irq, host);
+
+ probe_iounmap:
+ iounmap(host->base);
+
+ probe_free_mem_region:
+ release_mem_region(host->mem->start, RESSIZE(host->mem));
+
+ probe_free_host:
+ mmc_free_host(mmc);
+ probe_out:
+ return ret;
+}
+
+static int s3cmci_remove(struct platform_device *pdev)
+{
+ struct mmc_host *mmc = platform_get_drvdata(pdev);
+ struct s3cmci_host *host = mmc_priv(mmc);
+
+ mmc_remove_host(mmc);
+ clk_disable(host->clk);
+ clk_put(host->clk);
+ s3c2410_dma_free(S3CMCI_DMA, &s3cmci_dma_client);
+ free_irq(host->irq_cd, host);
+ free_irq(host->irq, host);
+ iounmap(host->base);
+ release_mem_region(host->mem->start, RESSIZE(host->mem));
+ mmc_free_host(mmc);
+
+ return 0;
+}
+
+static int s3cmci_probe_2410(struct platform_device *dev)
+{
+ return s3cmci_probe(dev, 0);
+}
+
+static int s3cmci_probe_2412(struct platform_device *dev)
+{
+ return s3cmci_probe(dev, 1);
+}
+
+static int s3cmci_probe_2440(struct platform_device *dev)
+{
+ return s3cmci_probe(dev, 1);
+}
+
+#ifdef CONFIG_PM
+
+static int s3cmci_suspend(struct platform_device *dev, pm_message_t state)
+{
+ struct mmc_host *mmc = platform_get_drvdata(dev);
+
+ return mmc_suspend_host(mmc, state);
+}
+
+static int s3cmci_resume(struct platform_device *dev)
+{
+ struct mmc_host *mmc = platform_get_drvdata(dev);
+
+ return mmc_resume_host(mmc);
+}
+
+#else /* CONFIG_PM */
+#define s3cmci_suspend NULL
+#define s3cmci_resume NULL
+#endif /* CONFIG_PM */
+
+
+static struct platform_driver s3cmci_driver_2410 = {
+ .driver.name = "s3c2410-sdi",
+ .probe = s3cmci_probe_2410,
+ .remove = s3cmci_remove,
+ .suspend = s3cmci_suspend,
+ .resume = s3cmci_resume,
+};
+
+static struct platform_driver s3cmci_driver_2412 = {
+ .driver.name = "s3c2412-sdi",
+ .probe = s3cmci_probe_2412,
+ .remove = s3cmci_remove,
+ .suspend = s3cmci_suspend,
+ .resume = s3cmci_resume,
+};
+
+static struct platform_driver s3cmci_driver_2440 = {
+ .driver.name = "s3c2440-sdi",
+ .probe = s3cmci_probe_2440,
+ .remove = s3cmci_remove,
+ .suspend = s3cmci_suspend,
+ .resume = s3cmci_resume,
+};
+
+
+static int __init s3cmci_init(void)
+{
+ platform_driver_register(&s3cmci_driver_2410);
+ platform_driver_register(&s3cmci_driver_2412);
+ platform_driver_register(&s3cmci_driver_2440);
+ return 0;
+}
+
+static void __exit s3cmci_exit(void)
+{
+ platform_driver_unregister(&s3cmci_driver_2410);
+ platform_driver_unregister(&s3cmci_driver_2412);
+ platform_driver_unregister(&s3cmci_driver_2440);
+}
+
+module_init(s3cmci_init);
+module_exit(s3cmci_exit);
+
+MODULE_DESCRIPTION("Samsung S3C MMC/SD Card Interface driver");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Thomas Kleffel <tk@...ntech.de>");
+
Index: linux-2.6/drivers/mmc/host/s3cmci.h
===================================================================
--- /dev/null
+++ linux-2.6/drivers/mmc/host/s3cmci.h
@@ -0,0 +1,71 @@
+/*
+ * linux/drivers/mmc/s3cmci.h - Samsung S3C MCI driver
+ *
+ * Copyright (C) 2004-2006 Thomas Kleffel, All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/* FIXME: DMA Resource management ?! */
+#define S3CMCI_DMA 0
+
+enum s3cmci_waitfor {
+ COMPLETION_NONE,
+ COMPLETION_FINALIZE,
+ COMPLETION_CMDSENT,
+ COMPLETION_RSPFIN,
+ COMPLETION_XFERFINISH,
+ COMPLETION_XFERFINISH_RSPFIN,
+};
+
+struct s3cmci_host {
+ struct platform_device *pdev;
+ struct s3c24xx_mci_pdata *pdata;
+ struct mmc_host *mmc;
+ struct resource *mem;
+ struct clk *clk;
+ void __iomem *base;
+ int irq;
+ int irq_cd;
+ int dma;
+
+ unsigned long clk_rate;
+ unsigned long clk_div;
+ unsigned long real_rate;
+ u8 prescaler;
+
+ int is2440;
+ unsigned sdiimsk;
+ unsigned sdidata;
+ int dodma;
+
+ int dmatogo;
+
+ struct mmc_request *mrq;
+ int cmd_is_stop;
+
+ spinlock_t complete_lock;
+ enum s3cmci_waitfor complete_what;
+
+ int dma_complete;
+
+ u32 pio_sgptr;
+ u32 pio_words;
+ u32 pio_count;
+ u32 *pio_ptr;
+#define XFER_NONE 0
+#define XFER_READ 1
+#define XFER_WRITE 2
+ u32 pio_active;
+
+ int bus_width;
+
+ char dbgmsg_cmd[301];
+ char dbgmsg_dat[301];
+ char *status;
+
+ unsigned int ccnt, dcnt;
+ struct tasklet_struct pio_tasklet;
+};
Index: linux-2.6/drivers/mmc/host/Kconfig
===================================================================
--- linux-2.6.orig/drivers/mmc/host/Kconfig
+++ linux-2.6/drivers/mmc/host/Kconfig
@@ -130,3 +130,14 @@
If unsure, or if your system has no SPI master driver, say N.
+config MMC_S3C
+ tristate "Samsung S3C24xx SD/MMC Card Interface support"
+ depends on ARCH_S3C2410 && MMC
+ help
+ This selects a driver for the MCI interface found in
+ Samsung's S3C2410, S3C2412, S3C2440, S3C2442 CPUs.
+ If you have a board based on one of those and a MMC/SD
+ slot, say Y or M here.
+
+ If unsure, say N.
+
Index: linux-2.6/drivers/mmc/host/Makefile
===================================================================
--- linux-2.6.orig/drivers/mmc/host/Makefile
+++ linux-2.6/drivers/mmc/host/Makefile
@@ -17,4 +17,4 @@
obj-$(CONFIG_MMC_AT91) += at91_mci.o
obj-$(CONFIG_MMC_TIFM_SD) += tifm_sd.o
obj-$(CONFIG_MMC_SPI) += mmc_spi.o
-
+obj-$(CONFIG_MMC_S3C) += s3cmci.o
--
- Harald Welte <laforge@...nmoko.org> http://openmoko.org/
============================================================================
Software for the world's first truly open Free Software mobile phone
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