r4785 - in developers/werner: . samsung samsung/sdio
werner at docs.openmoko.org
werner at docs.openmoko.org
Thu Nov 13 22:51:59 CET 2008
Author: werner
Date: 2008-11-13 22:51:58 +0100 (Thu, 13 Nov 2008)
New Revision: 4785
Added:
developers/werner/samsung/
developers/werner/samsung/sdio/
developers/werner/samsung/sdio/README
developers/werner/samsung/sdio/s3c-mmc-sdio-int.patch
developers/werner/samsung/sdio/s3cmci.c
developers/werner/samsung/sdio/s3cmci.h
Log:
Material for communication with Samsung.
Added: developers/werner/samsung/sdio/README
===================================================================
--- developers/werner/samsung/sdio/README (rev 0)
+++ developers/werner/samsung/sdio/README 2008-11-13 21:51:58 UTC (rev 4785)
@@ -0,0 +1,15 @@
+The SDIO interrupt work is based on the 2.6.28-rc2 kernel, e.g.,
+revision b961c6de2a96a96436bb342722974aaf54aea638
+of git clone git://git.openmoko.org/git/kernel.git
+
+For your convenience, a copy of the original files of the S3C SD driver
+is in this directory:
+
+drivers/mmc/host/s3cmci.h
+drivers/mmc/host/s3cmci.c
+
+The SDIO interrupt suppoer was written by Christer Weinigel:
+http://thread.gmane.org/gmane.linux.ports.arm.kernel/46380
+
+An updated version of his patch is in the file
+s3c-mmc-sdio-int.patch
Added: developers/werner/samsung/sdio/s3c-mmc-sdio-int.patch
===================================================================
--- developers/werner/samsung/sdio/s3c-mmc-sdio-int.patch (rev 0)
+++ developers/werner/samsung/sdio/s3c-mmc-sdio-int.patch 2008-11-13 21:51:58 UTC (rev 4785)
@@ -0,0 +1,191 @@
+http://thread.gmane.org/gmane.linux.ports.arm.kernel/46380
+
+Christer Weinigel wrote:
+> Now I just have to make the SDIO interrupt work and preferably get
+> DMA working so that I can reduce the CPU load a bit.
+
+Ok, this makes the SDIO interrupt work. The existing driver disables
+interrupts when not doing anything because it had problems with spurious
+ interrupts even when the interrupt mask was clear. So I've added some
+hacks to always keep the interrupts on. This needs doing better, so
+I've not signed off on this, and the patch is whitespace-damaged just so
+that nobody tries to apply it anyway (good excuse using the wrong
+mailer, isn't it).
+
+But do you think the interrupt support looks sane otherwise?
+
+ /Christer
+
+Index: ktrack/drivers/mmc/host/s3cmci.c
+===================================================================
+--- ktrack.orig/drivers/mmc/host/s3cmci.c 2008-10-29 00:57:08.000000000 -0200
++++ ktrack/drivers/mmc/host/s3cmci.c 2008-10-29 03:48:44.000000000 -0200
+@@ -198,7 +198,11 @@
+
+ static inline void clear_imask(struct s3cmci_host *host)
+ {
+- writel(0, host->base + host->sdiimsk);
++ u32 newmask;
++
++ newmask = readl(host->base + host->sdiimsk);
++ newmask &= S3C2410_SDIIMSK_SDIOIRQ;
++ writel(newmask, host->base + host->sdiimsk);
+ }
+
+ static inline int get_data_buffer(struct s3cmci_host *host,
+@@ -383,6 +387,7 @@
+ struct s3cmci_host *host = (struct s3cmci_host *) data;
+
+ disable_irq(host->irq);
++ host->irq_disabled++;
+
+ if (host->pio_active == XFER_WRITE)
+ do_pio_write(host);
+@@ -403,8 +408,12 @@
+ }
+
+ finalize_request(host);
+- } else
++ }
++
++ if (host->irq_disabled) {
+ enable_irq(host->irq);
++ host->irq_disabled--;
++ }
+ }
+
+ /*
+@@ -441,6 +450,7 @@
+ u32 mci_csta, mci_dsta, mci_fsta, mci_dcnt, mci_imsk;
+ u32 mci_cclear, mci_dclear;
+ unsigned long iflags;
++ int cardint = 0;
+
+ spin_lock_irqsave(&host->complete_lock, iflags);
+
+@@ -452,6 +462,13 @@
+ mci_cclear = 0;
+ mci_dclear = 0;
+
++ if (mci_dsta & S3C2410_SDIDSTA_SDIOIRQDETECT &&
++ mci_imsk & S3C2410_SDIIMSK_SDIOIRQ) {
++ cardint = 1;
++ mci_dclear = S3C2410_SDIDSTA_SDIOIRQDETECT;
++ goto clear_status_bits;
++ }
++
+ if ((host->complete_what == COMPLETION_NONE) ||
+ (host->complete_what == COMPLETION_FINALIZE)) {
+ host->status = "nothing to complete";
+@@ -621,6 +638,11 @@
+ mci_csta, mci_dsta, mci_fsta, mci_dcnt, host->status);
+
+ spin_unlock_irqrestore(&host->complete_lock, iflags);
++
++ /* We have to delay this as it calls back into the driver. */
++ if (cardint)
++ mmc_signal_sdio_irq(host->mmc);
++
+ return IRQ_HANDLED;
+ }
+
+@@ -689,7 +711,7 @@
+ fail_request:
+ host->mrq->data->error = -EINVAL;
+ host->complete_what = COMPLETION_FINALIZE;
+- writel(0, host->base + host->sdiimsk);
++ clear_imask(host);
+ goto out;
+
+ }
+@@ -734,7 +756,7 @@
+ 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);
++ clear_imask(host);
+
+ if (cmd->data && cmd->error)
+ cmd->data->error = cmd->error;
+@@ -1045,7 +1067,10 @@
+ s3cmci_send_command(host, cmd);
+
+ /* Enable Interrupt */
+- enable_irq(host->irq);
++ if (host->irq_disabled) {
++ enable_irq(host->irq);
++ host->irq_disabled--;
++ }
+ }
+
+ static int s3cmci_card_present(struct mmc_host *mmc)
+@@ -1145,9 +1170,9 @@
+
+ /* Set CLOCK_ENABLE */
+ if (ios->clock)
+- mci_con |= S3C2410_SDICON_CLOCKTYPE;
++ mci_con |= S3C2410_SDICON_CLOCKTYPE | S3C2410_SDICON_SDIOIRQ;
+ else
+- mci_con &= ~S3C2410_SDICON_CLOCKTYPE;
++ mci_con &= ~(S3C2410_SDICON_CLOCKTYPE | S3C2410_SDICON_SDIOIRQ);
+
+ writel(mci_con, host->base + S3C2410_SDICON);
+
+@@ -1187,11 +1212,27 @@
+ return ret;
+ }
+
++static void s3cmci_enable_sdio_irq(struct mmc_host *mmc, int enable)
++{
++ struct s3cmci_host *host = mmc_priv(mmc);
++ unsigned long flags;
++
++ spin_lock_irqsave(&host->complete_lock, flags);
++
++ if (enable)
++ enable_imask(host, S3C2410_SDIIMSK_SDIOIRQ);
++ else
++ disable_imask(host, S3C2410_SDIIMSK_SDIOIRQ);
++
++ spin_unlock_irqrestore(&host->complete_lock, flags);
++}
++
+ static struct mmc_host_ops s3cmci_ops = {
+ .request = s3cmci_request,
+ .set_ios = s3cmci_set_ios,
+ .get_ro = s3cmci_get_ro,
+ .get_cd = s3cmci_card_present,
++ .enable_sdio_irq = s3cmci_enable_sdio_irq,
+ };
+
+ static struct s3c24xx_mci_pdata s3cmci_def_pdata = {
+@@ -1339,6 +1380,7 @@
+ * ensure we don't lock the system with un-serviceable requests. */
+
+ disable_irq(host->irq);
++ host->irq_disabled++;
+
+ host->irq_cd = s3c2410_gpio_getirq(host->pdata->gpio_detect);
+
+@@ -1384,7 +1426,7 @@
+
+ mmc->ops = &s3cmci_ops;
+ mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
+- mmc->caps = MMC_CAP_4_BIT_DATA;
++ mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_SDIO_IRQ;
+ mmc->f_min = host->clk_rate / (host->clk_div * 256);
+ mmc->f_max = host->clk_rate / host->clk_div;
+
+Index: ktrack/drivers/mmc/host/s3cmci.h
+===================================================================
+--- ktrack.orig/drivers/mmc/host/s3cmci.h 2008-10-29 00:57:08.000000000 -0200
++++ ktrack/drivers/mmc/host/s3cmci.h 2008-10-29 03:49:21.000000000 -0200
+@@ -68,6 +68,8 @@
+ unsigned int ccnt, dcnt;
+ struct tasklet_struct pio_tasklet;
+
++ int irq_disabled;
++
+ #ifdef CONFIG_CPU_FREQ
+ struct notifier_block freq_transition;
+ #endif
Added: developers/werner/samsung/sdio/s3cmci.c
===================================================================
--- developers/werner/samsung/sdio/s3cmci.c (rev 0)
+++ developers/werner/samsung/sdio/s3cmci.c 2008-11-13 21:51:58 UTC (rev 4785)
@@ -0,0 +1,1584 @@
+/*
+ * linux/drivers/mmc/s3cmci.h - Samsung S3C MCI driver
+ *
+ * Copyright (C) 2004-2006 maintech GmbH, Thomas Kleffel <tk at maintech.de>
+ * Copyright (C) 2007 Harald Welte <laforge at gnumonks.org>
+ *
+ * Current driver maintained by Ben Dooks and Simtec Electronics
+ * Copyright (C) 2008 Simtec Electronics <ben-linux at fluff.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/host.h>
+#include <linux/platform_device.h>
+#include <linux/cpufreq.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+
+#include <asm/dma.h>
+
+#include <mach/regs-sdi.h>
+#include <mach/regs-gpio.h>
+
+#include <plat/mci.h>
+
+#include <asm/dma.h>
+#include <asm/dma-mapping.h>
+
+#include <asm/io.h>
+#include <mach/regs-gpio.h>
+#include <mach/mci.h>
+#include <mach/dma.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_fail;
+static const int dbgmap_info = dbg_info | dbg_conf;
+static const int dbgmap_debug = dbg_err | 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 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:%i arg:0x%08x flags:0x08%x retries:%u",
+ host->ccnt, (stop ? " (STOP)" : ""),
+ 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[ERR %i] %s Status:%s\n",
+ cmd->error, host->dbgmsg_cmd, host->status);
+ }
+
+ if (!cmd->data)
+ return;
+
+ if (cmd->data->error == 0) {
+ dbg(host, dbglvl, "DAT[OK] %s\n", host->dbgmsg_dat);
+ } else {
+ dbg(host, dbglvl, "DAT[ERR %i] %s DCNT:0x%08x\n",
+ cmd->data->error, host->dbgmsg_dat,
+ readl(host->base + S3C2410_SDIDCNT));
+ }
+}
+#else
+static void dbg_dumpcmd(struct s3cmci_host *host,
+ struct mmc_command *cmd, int fail) { }
+
+static void prepare_dbgmsg(struct s3cmci_host *host, struct mmc_command *cmd,
+ int stop) { }
+
+static void dbg_dumpregs(struct s3cmci_host *host, char *prefix) { }
+
+#endif /* CONFIG_MMC_DEBUG */
+
+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 *bytes, 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];
+
+ *bytes = sg->length;
+ *pointer = sg_virt(sg);
+
+ host->pio_sgptr++;
+
+ dbg(host, dbg_sg, "new buffer (%i/%i)\n",
+ host->pio_sgptr, host->mrq->data->sg_len);
+
+ return 0;
+}
+
+static inline u32 fifo_count(struct s3cmci_host *host)
+{
+ u32 fifostat = readl(host->base + S3C2410_SDIFSTA);
+
+ fifostat &= S3C2410_SDIFSTA_COUNTMASK;
+ return fifostat;
+}
+
+static inline u32 fifo_free(struct s3cmci_host *host)
+{
+ u32 fifostat = readl(host->base + S3C2410_SDIFSTA);
+
+ fifostat &= S3C2410_SDIFSTA_COUNTMASK;
+ return 63 - fifostat;
+}
+
+static void do_pio_read(struct s3cmci_host *host)
+{
+ int res;
+ u32 fifo;
+ u32 *ptr;
+ u32 fifo_words;
+ 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_count(host))) {
+ if (!host->pio_bytes) {
+ res = get_data_buffer(host, &host->pio_bytes,
+ &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_bytes, host->pio_ptr);
+ }
+
+ dbg(host, dbg_pio,
+ "pio_read(): fifo:[%02i] buffer:[%03i] dcnt:[%08X]\n",
+ fifo, host->pio_bytes,
+ readl(host->base + S3C2410_SDIDCNT));
+
+ /* If we have reached the end of the block, we can
+ * read a word and get 1 to 3 bytes. If we in the
+ * middle of the block, we have to read full words,
+ * otherwise we will write garbage, so round down to
+ * an even multiple of 4. */
+ if (fifo >= host->pio_bytes)
+ fifo = host->pio_bytes;
+ else {
+ fifo -= fifo & 3;
+ if (!fifo)
+ break;
+ }
+
+ host->pio_bytes -= fifo;
+ host->pio_count += fifo;
+
+ fifo_words = fifo >> 2;
+ ptr = host->pio_ptr;
+ while (fifo_words--)
+ *ptr++ = readl(from_ptr);
+ host->pio_ptr = ptr;
+
+ if (fifo & 3) {
+ u32 n = fifo & 3;
+ u32 data = readl(from_ptr);
+ u8 *p = (u8 *)host->pio_ptr;
+
+ while (n--) {
+ *p++ = data;
+ data >>= 8;
+ }
+ }
+ }
+
+ if (!host->pio_bytes) {
+ res = get_data_buffer(host, &host->pio_bytes, &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 void do_pio_write(struct s3cmci_host *host)
+{
+ void __iomem *to_ptr;
+ int res;
+ u32 fifo;
+ u32 *ptr;
+
+ to_ptr = host->base + host->sdidata;
+
+ while ((fifo = fifo_free(host))) {
+ if (!host->pio_bytes) {
+ res = get_data_buffer(host, &host->pio_bytes,
+ &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_bytes, host->pio_ptr);
+
+ }
+
+ /* If we have reached the end of the block, we have to
+ * write exactly the remaining number of bytes. If we
+ * in the middle of the block, we have to write full
+ * words, so round down to an even multiple of 4. */
+ if (fifo >= host->pio_bytes)
+ fifo = host->pio_bytes;
+ else {
+ fifo -= fifo & 3;
+ if (!fifo)
+ break;
+ }
+
+ host->pio_bytes -= fifo;
+ host->pio_count += fifo;
+
+ fifo = (fifo + 3) >> 2;
+ ptr = host->pio_ptr;
+ while (fifo--)
+ writel(*ptr++, to_ptr);
+ host->pio_ptr = 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_bytes:[%u]\n",
+ (host->pio_active == XFER_READ) ? "read" : "write",
+ host->pio_count, host->pio_bytes);
+
+ if (host->mrq->data)
+ host->mrq->data->error = -EINVAL;
+ }
+
+ 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 Indicates 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 = dev_id;
+ struct mmc_command *cmd;
+ u32 mci_csta, mci_dsta, mci_fsta, mci_dcnt, mci_imsk;
+ u32 mci_cclear, mci_dclear;
+ unsigned long iflags;
+
+ 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) {
+ dbg(host, dbg_err, "CMDSTAT: error CMDTIMEOUT\n");
+ 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: ignore CRC fail with long rsp\n");
+ } else {
+ /* note, we used to fail the transfer
+ * here, but it seems that this is just
+ * the hardware getting it wrong.
+ *
+ * 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) {
+ dbg(host, dbg_err, "FIFO failure\n");
+ host->mrq->data->error = -EILSEQ;
+ host->status = "error: 2440 fifo failure";
+ goto fail_transfer;
+ }
+ } else {
+ if (mci_dsta & S3C2410_SDIDSTA_FIFOFAIL) {
+ dbg(host, dbg_err, "FIFO failure\n");
+ cmd->data->error = -EILSEQ;
+ host->status = "error: fifo failure";
+ goto fail_transfer;
+ }
+ }
+
+ if (mci_dsta & S3C2410_SDIDSTA_RXCRCFAIL) {
+ dbg(host, dbg_err, "bad data crc (outgoing)\n");
+ cmd->data->error = -EILSEQ;
+ host->status = "error: bad data crc (outgoing)";
+ goto fail_transfer;
+ }
+
+ if (mci_dsta & S3C2410_SDIDSTA_CRCFAIL) {
+ dbg(host, dbg_err, "bad data crc (incoming)\n");
+ cmd->data->error = -EILSEQ;
+ host->status = "error: bad data crc (incoming)";
+ goto fail_transfer;
+ }
+
+ if (mci_dsta & S3C2410_SDIDSTA_DATATIMEOUT) {
+ dbg(host, dbg_err, "data timeout\n");
+ 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, msecs_to_jiffies(500));
+
+ return IRQ_HANDLED;
+}
+
+static void s3cmci_dma_done_callback(struct s3c2410_dma_chan *dma_ch,
+ void *buf_id, int size,
+ enum s3c2410_dma_buffresult result)
+{
+ struct s3cmci_host *host = buf_id;
+ unsigned long iflags;
+ u32 mci_csta, mci_dsta, mci_fsta, mci_dcnt;
+
+ 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);
+
+ BUG_ON(!host->mrq);
+ BUG_ON(!host->mrq->data);
+ BUG_ON(!host->dmatogo);
+
+ 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 = -EINVAL;
+ 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 from controller. */
+ 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);
+
+ writel(host->prescaler, host->base + S3C2410_SDIPRE);
+
+ if (cmd->error)
+ debug_as_failure = 1;
+
+ if (cmd->data && cmd->data->error)
+ debug_as_failure = 1;
+
+ dbg_dumpcmd(host, cmd, debug_as_failure);
+
+ /* 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 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 != 0) {
+ 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);
+}
+
+static void s3cmci_dma_setup(struct s3cmci_host *host,
+ enum s3c2410_dmasrc source)
+{
+ static enum s3c2410_dmasrc last_source = -1;
+ static int setup_ok;
+
+ 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;
+ }
+
+ if ((data->blksz & 3) != 0) {
+ /* We cannot deal with unaligned blocks with more than
+ * one block being transfered. */
+
+ if (data->blocks > 1) {
+ pr_warning("%s: can't do non-word sized block transfers (blksz %d)\n", __func__, data->blksz);
+ return -EINVAL;
+ }
+ }
+
+ 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 ((stoptries--) == 0) {
+ dbg_dumpregs(host, "DRF");
+ 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;
+}
+
+#define BOTH_DIR (MMC_DATA_WRITE | MMC_DATA_READ)
+
+static int s3cmci_prepare_pio(struct s3cmci_host *host, struct mmc_data *data)
+{
+ int rw = (data->flags & MMC_DATA_WRITE) ? 1 : 0;
+
+ BUG_ON((data->flags & BOTH_DIR) == BOTH_DIR);
+
+ host->pio_sgptr = 0;
+ host->pio_bytes = 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;
+
+ BUG_ON((data->flags & BOTH_DIR) == BOTH_DIR);
+
+ 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++;
+ prepare_dbgmsg(host, cmd, host->cmd_is_stop);
+
+ /* 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 = s3cmci_setup_data(host, cmd->data);
+
+ host->dcnt++;
+
+ if (res) {
+ dbg(host, dbg_err, "setup data error %d\n", res);
+ cmd->error = res;
+ cmd->data->error = res;
+
+ 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) {
+ dbg(host, dbg_err, "data prepare error %d\n", res);
+ cmd->error = res;
+ cmd->data->error = res;
+ cmd->data->error = -EIO;
+
+ mmc_request_done(mmc, mrq);
+ return;
+ }
+ }
+
+ /* Send command */
+ s3cmci_send_command(host, cmd);
+
+ /* Enable Interrupt */
+ enable_irq(host->irq);
+}
+
+static int s3cmci_card_present(struct mmc_host *mmc)
+{
+ struct s3cmci_host *host = mmc_priv(mmc);
+ struct s3c24xx_mci_pdata *pdata = host->pdata;
+ int ret;
+
+ if (pdata->gpio_detect == 0)
+ return -ENOSYS;
+
+ ret = s3c2410_gpio_getpin(pdata->gpio_detect) ? 0 : 1;
+ return ret ^ pdata->detect_invert;
+}
+
+static void s3cmci_request(struct mmc_host *mmc, struct mmc_request *mrq)
+{
+ struct s3cmci_host *host = mmc_priv(mmc);
+
+ host->status = "mmc request";
+ host->cmd_is_stop = 0;
+ host->mrq = mrq;
+
+ if (s3cmci_card_present(mmc) == 0) {
+ dbg(host, dbg_err, "%s: no medium present\n", __func__);
+ host->mrq->cmd->error = -ENOMEDIUM;
+ mmc_request_done(mmc, mrq);
+ } else
+ s3cmci_send_request(mmc);
+}
+
+static void s3cmci_set_clk(struct s3cmci_host *host, struct mmc_ios *ios)
+{
+ u32 mci_psc;
+
+ /* 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;
+}
+
+static void s3cmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
+{
+ struct s3cmci_host *host = mmc_priv(mmc);
+ u32 mci_con;
+
+ /* Set the power state */
+
+ 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->is2440)
+ mci_con |= S3C2440_SDICON_SDRESET;
+
+ if (host->pdata->set_power)
+ host->pdata->set_power(ios->power_mode, ios->vdd);
+
+ break;
+ }
+
+ s3cmci_set_clk(host, ios);
+
+ /* 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);
+ struct s3c24xx_mci_pdata *pdata = host->pdata;
+ int ret;
+
+ if (pdata->gpio_wprotect == 0)
+ return 0;
+
+ ret = s3c2410_gpio_getpin(pdata->gpio_wprotect);
+
+ if (pdata->wprotect_invert)
+ ret = !ret;
+
+ return ret;
+}
+
+static struct mmc_host_ops s3cmci_ops = {
+ .request = s3cmci_request,
+ .set_ios = s3cmci_set_ios,
+ .get_ro = s3cmci_get_ro,
+ .get_cd = s3cmci_card_present,
+};
+
+static struct s3c24xx_mci_pdata s3cmci_def_pdata = {
+ /* This is currently here to avoid a number of if (host->pdata)
+ * checks. Any zero fields to ensure reaonable defaults are picked. */
+};
+
+#ifdef CONFIG_CPU_FREQ
+
+static int s3cmci_cpufreq_transition(struct notifier_block *nb,
+ unsigned long val, void *data)
+{
+ struct s3cmci_host *host;
+ struct mmc_host *mmc;
+ unsigned long newclk;
+ unsigned long flags;
+
+ host = container_of(nb, struct s3cmci_host, freq_transition);
+ newclk = clk_get_rate(host->clk);
+ mmc = host->mmc;
+
+ if ((val == CPUFREQ_PRECHANGE && newclk > host->clk_rate) ||
+ (val == CPUFREQ_POSTCHANGE && newclk < host->clk_rate)) {
+ spin_lock_irqsave(&mmc->lock, flags);
+
+ host->clk_rate = newclk;
+
+ if (mmc->ios.power_mode != MMC_POWER_OFF &&
+ mmc->ios.clock != 0)
+ s3cmci_set_clk(host, &mmc->ios);
+
+ spin_unlock_irqrestore(&mmc->lock, flags);
+ }
+
+ return 0;
+}
+
+static inline int s3cmci_cpufreq_register(struct s3cmci_host *host)
+{
+ host->freq_transition.notifier_call = s3cmci_cpufreq_transition;
+
+ return cpufreq_register_notifier(&host->freq_transition,
+ CPUFREQ_TRANSITION_NOTIFIER);
+}
+
+static inline void s3cmci_cpufreq_deregister(struct s3cmci_host *host)
+{
+ cpufreq_unregister_notifier(&host->freq_transition,
+ CPUFREQ_TRANSITION_NOTIFIER);
+}
+
+#else
+static inline int s3cmci_cpufreq_register(struct s3cmci_host *host)
+{
+ return 0;
+}
+
+static inline void s3cmci_cpufreq_deregister(struct s3cmci_host *host)
+{
+}
+#endif
+
+static int __devinit s3cmci_probe(struct platform_device *pdev, int is2440)
+{
+ struct s3cmci_host *host;
+ struct mmc_host *mmc;
+ 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->is2440 = is2440;
+
+ 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->sdiimsk = S3C2440_SDIIMSK;
+ host->sdidata = S3C2440_SDIDATA;
+ host->clk_div = 1;
+ } else {
+ 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->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) {
+ 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;
+ }
+
+ /* We get spurious interrupts even when we have set the IMSK
+ * register to ignore everything, so use disable_irq() to make
+ * ensure we don't lock the system with un-serviceable requests. */
+
+ disable_irq(host->irq);
+
+ host->irq_cd = s3c2410_gpio_getirq(host->pdata->gpio_detect);
+
+ if (host->irq_cd >= 0) {
+ if (request_irq(host->irq_cd, s3cmci_irq_cd,
+ IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
+ DRIVER_NAME, host)) {
+ dev_err(&pdev->dev, "can't get card detect irq.\n");
+ ret = -ENOENT;
+ goto probe_free_irq;
+ }
+ } else {
+ dev_warn(&pdev->dev, "host detect has no irq available\n");
+ s3c2410_gpio_cfgpin(host->pdata->gpio_detect,
+ S3C2410_GPIO_INPUT);
+ }
+
+ 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) < 0) {
+ 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 = MMC_VDD_32_33 | MMC_VDD_33_34;
+ 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;
+
+ if (host->pdata->ocr_avail)
+ mmc->ocr_avail = host->pdata->ocr_avail;
+
+ 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 = s3cmci_cpufreq_register(host);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to register cpufreq\n");
+ goto free_dmabuf;
+ }
+
+ ret = mmc_add_host(mmc);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to add mmc host.\n");
+ goto free_cpufreq;
+ }
+
+ platform_set_drvdata(pdev, mmc);
+ dev_info(&pdev->dev, "initialisation done.\n");
+
+ return 0;
+
+ free_cpufreq:
+ s3cmci_cpufreq_deregister(host);
+
+ free_dmabuf:
+ clk_disable(host->clk);
+
+ clk_free:
+ clk_put(host->clk);
+
+ probe_free_irq_cd:
+ if (host->irq_cd >= 0)
+ 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 void s3cmci_shutdown(struct platform_device *pdev)
+{
+ struct mmc_host *mmc = platform_get_drvdata(pdev);
+ struct s3cmci_host *host = mmc_priv(mmc);
+
+ if (host->irq_cd >= 0)
+ free_irq(host->irq_cd, host);
+
+ s3cmci_cpufreq_deregister(host);
+ mmc_remove_host(mmc);
+ clk_disable(host->clk);
+}
+
+static int __devexit s3cmci_remove(struct platform_device *pdev)
+{
+ struct mmc_host *mmc = platform_get_drvdata(pdev);
+ struct s3cmci_host *host = mmc_priv(mmc);
+
+ s3cmci_shutdown(pdev);
+
+ clk_put(host->clk);
+
+ tasklet_disable(&host->pio_tasklet);
+ s3c2410_dma_free(S3CMCI_DMA, &s3cmci_dma_client);
+
+ 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 __devinit s3cmci_2410_probe(struct platform_device *dev)
+{
+ return s3cmci_probe(dev, 0);
+}
+
+static int __devinit s3cmci_2412_probe(struct platform_device *dev)
+{
+ return s3cmci_probe(dev, 1);
+}
+
+static int __devinit s3cmci_2440_probe(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_2410_driver = {
+ .driver.name = "s3c2410-sdi",
+ .driver.owner = THIS_MODULE,
+ .probe = s3cmci_2410_probe,
+ .remove = __devexit_p(s3cmci_remove),
+ .shutdown = s3cmci_shutdown,
+ .suspend = s3cmci_suspend,
+ .resume = s3cmci_resume,
+};
+
+static struct platform_driver s3cmci_2412_driver = {
+ .driver.name = "s3c2412-sdi",
+ .driver.owner = THIS_MODULE,
+ .probe = s3cmci_2412_probe,
+ .remove = __devexit_p(s3cmci_remove),
+ .shutdown = s3cmci_shutdown,
+ .suspend = s3cmci_suspend,
+ .resume = s3cmci_resume,
+};
+
+static struct platform_driver s3cmci_2440_driver = {
+ .driver.name = "s3c2440-sdi",
+ .driver.owner = THIS_MODULE,
+ .probe = s3cmci_2440_probe,
+ .remove = __devexit_p(s3cmci_remove),
+ .shutdown = s3cmci_shutdown,
+ .suspend = s3cmci_suspend,
+ .resume = s3cmci_resume,
+};
+
+
+static int __init s3cmci_init(void)
+{
+ platform_driver_register(&s3cmci_2410_driver);
+ platform_driver_register(&s3cmci_2412_driver);
+ platform_driver_register(&s3cmci_2440_driver);
+ return 0;
+}
+
+static void __exit s3cmci_exit(void)
+{
+ platform_driver_unregister(&s3cmci_2410_driver);
+ platform_driver_unregister(&s3cmci_2412_driver);
+ platform_driver_unregister(&s3cmci_2440_driver);
+}
+
+module_init(s3cmci_init);
+module_exit(s3cmci_exit);
+
+MODULE_DESCRIPTION("Samsung S3C MMC/SD Card Interface driver");
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Thomas Kleffel <tk at maintech.de>, Ben Dooks <ben-linux at fluff.org>");
+MODULE_ALIAS("platform:s3c2410-sdi");
+MODULE_ALIAS("platform:s3c2412-sdi");
+MODULE_ALIAS("platform:s3c2440-sdi");
+
Added: developers/werner/samsung/sdio/s3cmci.h
===================================================================
--- developers/werner/samsung/sdio/s3cmci.h (rev 0)
+++ developers/werner/samsung/sdio/s3cmci.h 2008-11-13 21:51:58 UTC (rev 4785)
@@ -0,0 +1,74 @@
+/*
+ * 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_bytes;
+ 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;
+
+#ifdef CONFIG_CPU_FREQ
+ struct notifier_block freq_transition;
+#endif
+};
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