bump to 2.6.30-rc6

SVN-Revision: 15918

1 files changed, 1167 insertions, 0 deletions

diff --git a/target/linux/s3c24xx/files-2.6.30/drivers/mfd/glamo/glamo-mci.c b/target/linux/s3c24xx/files-2.6.30/drivers/mfd/glamo/glamo-mci.c
new file mode 100644
index 0000000..956be57
--- /dev/null
+++ b/target/linux/s3c24xx/files-2.6.30/drivers/mfd/glamo/glamo-mci.c
@@ -0,0 +1,1167 @@
+/*
+ *  linux/drivers/mmc/host/glamo-mmc.c - Glamo MMC driver
+ *
+ *  Copyright (C) 2007 Openmoko, Inc,  Andy Green <andy@openmoko.com>
+ *  Based on S3C MMC driver that was:
+ *  Copyright (C) 2004-2006 maintech GmbH, Thomas Kleffel <tk@maintech.de>
+ *
+ * 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 <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/spinlock.h>
+#include <linux/workqueue.h>
+
+#include <asm/dma.h>
+#include <asm/dma-mapping.h>
+#include <asm/io.h>
+
+#include "glamo-mci.h"
+#include "glamo-core.h"
+#include "glamo-regs.h"
+
+/* from glamo-core.c */
+extern struct glamo_mci_pdata glamo_mci_def_pdata;
+
+static spinlock_t clock_lock;
+
+#define DRIVER_NAME "glamo-mci"
+#define RESSIZE(ressource) (((ressource)->end - (ressource)->start) + 1)
+
+static void glamo_mci_send_request(struct mmc_host *mmc);
+
+/*
+ * Max SD clock rate
+ *
+ * held at /(3 + 1) due to concerns of 100R recommended series resistor
+ * allows 16MHz @ 4-bit --> 8MBytes/sec raw
+ *
+ * you can override this on kernel commandline using
+ *
+ *   glamo_mci.sd_max_clk=10000000
+ *
+ * for example
+ */
+
+static int sd_max_clk = 50000000 / 3;
+module_param(sd_max_clk, int, 0644);
+
+/*
+ * Slow SD clock rate
+ *
+ * you can override this on kernel commandline using
+ *
+ *   glamo_mci.sd_slow_ratio=8
+ *
+ * for example
+ *
+ * platform callback is used to decide effective clock rate, if not
+ * defined then max is used, if defined and returns nonzero, rate is
+ * divided by this factor
+ */
+
+static int sd_slow_ratio = 8;
+module_param(sd_slow_ratio, int, 0644);
+
+/*
+ * Post-power SD clock rate
+ *
+ * you can override this on kernel commandline using
+ *
+ *   glamo_mci.sd_post_power_clock=1000000
+ *
+ * for example
+ *
+ * After changing power to card, clock is held at this rate until first bulk
+ * transfer completes
+ */
+
+static int sd_post_power_clock = 1000000;
+module_param(sd_post_power_clock, int, 0644);
+
+
+/*
+ * SD Signal drive strength
+ *
+ * you can override this on kernel commandline using
+ *
+ *   glamo_mci.sd_drive=0
+ *
+ * for example
+ */
+
+static int sd_drive;
+module_param(sd_drive, int, 0644);
+
+/*
+ * SD allow SD clock to run while idle
+ *
+ * you can override this on kernel commandline using
+ *
+ *   glamo_mci.sd_idleclk=0
+ *
+ * for example
+ */
+
+static int sd_idleclk = 0; /* disallow idle clock by default */
+module_param(sd_idleclk, int, 0644);
+
+/* used to stash real idleclk state in suspend: we force it to run in there */
+static int suspend_sd_idleclk;
+
+
+unsigned char CRC7(u8 * pu8, int cnt)
+{
+	u8 crc = 0;
+
+	while (cnt--) {
+		int n;
+		u8 d = *pu8++;
+		for (n = 0; n < 8; n++) {
+			crc <<= 1;
+			if ((d & 0x80) ^ (crc & 0x80))
+				crc ^= 0x09;
+			d <<= 1;
+		}
+	}
+	return (crc << 1) | 1;
+}
+
+static int get_data_buffer(struct glamo_mci_host *host,
+			   volatile u32 *words, volatile u16 **pointer)
+{
+	struct scatterlist *sg;
+
+	*words = 0;
+	*pointer = NULL;
+
+	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) {
+		dev_dbg(&host->pdev->dev, "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 >> 1; /* we are working with a 16-bit data bus */
+	*pointer = page_address(sg_page(sg)) + sg->offset;
+
+	BUG_ON(((long)(*pointer)) & 1);
+
+	host->pio_sgptr++;
+
+	/* dev_info(&host->pdev->dev, "new buffer (%i/%i)\n",
+	      host->pio_sgptr, host->mrq->data->sg_len); */
+	return 0;
+}
+
+static void do_pio_read(struct glamo_mci_host *host)
+{
+	int res;
+	u16 __iomem *from_ptr = host->base_data + (RESSIZE(host->mem_data) /
+							      sizeof(u16) / 2);
+#ifdef DEBUG
+	u16 * block;
+#endif
+
+	while (1) {
+		res = get_data_buffer(host, &host->pio_words, &host->pio_ptr);
+		if (res) {
+			host->pio_active = XFER_NONE;
+			host->complete_what = COMPLETION_FINALIZE;
+
+			dev_dbg(&host->pdev->dev, "pio_read(): "
+				"complete (no more data).\n");
+			return;
+		}
+
+		dev_dbg(&host->pdev->dev, "pio_read(): host->pio_words: %d\n",
+				host->pio_words);
+
+		host->pio_count += host->pio_words << 1;
+
+#ifdef DEBUG
+		block = (u16 *)host->pio_ptr;
+		res = host->pio_words << 1;
+#endif
+#if 0
+		/* u16-centric memcpy */
+		while (host->pio_words--)
+			*host->pio_ptr++ = *from_ptr++;
+#else
+		/* memcpy can be faster? */
+		memcpy((void *)host->pio_ptr, from_ptr, host->pio_words << 1);
+		host->pio_ptr += host->pio_words;
+#endif
+
+#ifdef DEBUG
+		print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 16, 1,
+			       (void *)block, res, 1);
+#endif
+	}
+}
+
+static int do_pio_write(struct glamo_mci_host *host)
+{
+	int res = 0;
+	volatile u16 __iomem *to_ptr = host->base_data;
+	int err = 0;
+
+	dev_dbg(&host->pdev->dev, "pio_write():\n");
+	while (!res) {
+		res = get_data_buffer(host, &host->pio_words, &host->pio_ptr);
+		if (res)
+			continue;
+
+		dev_dbg(&host->pdev->dev, "pio_write():new source: [%i]@[%p]\n",
+			host->pio_words, host->pio_ptr);
+
+		host->pio_count += host->pio_words << 1;
+		while (host->pio_words--)
+			writew(*host->pio_ptr++, to_ptr++);
+	}
+
+	dev_dbg(&host->pdev->dev, "pio_write(): complete\n");
+	host->pio_active = XFER_NONE;
+	return err;
+}
+
+static void __glamo_mci_fix_card_div(struct glamo_mci_host *host, int div)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&clock_lock, flags);
+
+	if (div < 0) {
+		/* stop clock - remove clock from divider input */
+		writew(readw(glamo_mci_def_pdata.pglamo->base +
+		     GLAMO_REG_CLOCK_GEN5_1) & (~GLAMO_CLOCK_GEN51_EN_DIV_TCLK),
+		     glamo_mci_def_pdata.pglamo->base + GLAMO_REG_CLOCK_GEN5_1);
+
+		goto done;
+	} else {
+		/* set the nearest prescaler factor
+		*
+		* register shared with SCLK divisor -- no chance of race because
+		* we don't use sensor interface
+		*/
+		writew((readw(glamo_mci_def_pdata.pglamo->base +
+				GLAMO_REG_CLOCK_GEN8) & 0xff00) | div,
+		       glamo_mci_def_pdata.pglamo->base + GLAMO_REG_CLOCK_GEN8);
+		/* enable clock to divider input */
+		writew(readw(glamo_mci_def_pdata.pglamo->base +
+			GLAMO_REG_CLOCK_GEN5_1) | GLAMO_CLOCK_GEN51_EN_DIV_TCLK,
+		     glamo_mci_def_pdata.pglamo->base + GLAMO_REG_CLOCK_GEN5_1);
+	}
+
+	if (host->force_slow_during_powerup)
+		div = host->clk_rate / sd_post_power_clock;
+	else
+		if (host->pdata->glamo_mci_use_slow)
+			if ((host->pdata->glamo_mci_use_slow)())
+				div = div * sd_slow_ratio;
+
+	if (div > 255)
+		div = 255;
+
+	/*
+	 * set the nearest prescaler factor
+	 *
+	 * register shared with SCLK divisor -- no chance of race because
+	 * we don't use sensor interface
+	 */
+	writew((readw(glamo_mci_def_pdata.pglamo->base +
+			GLAMO_REG_CLOCK_GEN8) & 0xff00) | div,
+		glamo_mci_def_pdata.pglamo->base + GLAMO_REG_CLOCK_GEN8);
+	/* enable clock to divider input */
+	writew(readw(glamo_mci_def_pdata.pglamo->base +
+		GLAMO_REG_CLOCK_GEN5_1) | GLAMO_CLOCK_GEN51_EN_DIV_TCLK,
+		glamo_mci_def_pdata.pglamo->base + GLAMO_REG_CLOCK_GEN5_1);
+
+done:
+	spin_unlock_irqrestore(&clock_lock, flags);
+}
+
+static int __glamo_mci_set_card_clock(struct glamo_mci_host *host, int freq,
+								  int *division)
+{
+	int div = 0;
+	int real_rate = 0;
+
+	if (freq) {
+		/* Set clock */
+		for (div = 0; div < 256; div++) {
+			real_rate = host->clk_rate / (div + 1);
+			if (real_rate <= freq)
+				break;
+		}
+		if (div > 255)
+			div = 255;
+
+		if (division)
+			*division = div;
+
+		__glamo_mci_fix_card_div(host, div);
+
+	} else {
+		/* stop clock */
+		if (division)
+			*division = 0xff;
+
+		if (!sd_idleclk && !host->force_slow_during_powerup)
+			/* clock off */
+			__glamo_mci_fix_card_div(host, -1);
+	}
+
+	return real_rate;
+}
+
+
+static void glamo_mci_irq_worker(struct work_struct *work)
+{
+	struct glamo_mci_host *host =
+			    container_of(work, struct glamo_mci_host, irq_work);
+	struct mmc_command *cmd = host->mrq->cmd;
+
+	if (host->pio_active == XFER_READ)
+		do_pio_read(host);
+
+	host->mrq->data->bytes_xfered = host->pio_count;
+	dev_dbg(&host->pdev->dev, "count=%d\n", host->pio_count);
+
+	/* issue STOP if we have been given one to use */
+	if (host->mrq->stop) {
+		host->cmd_is_stop = 1;
+		glamo_mci_send_request(host->mmc);
+		host->cmd_is_stop = 0;
+	}
+
+	if (!sd_idleclk && !host->force_slow_during_powerup)
+		/* clock off */
+		__glamo_mci_fix_card_div(host, -1);
+
+	host->complete_what = COMPLETION_NONE;
+	host->mrq = NULL;
+	mmc_request_done(host->mmc, cmd->mrq);
+}
+
+static void glamo_mci_irq_host(struct glamo_mci_host *host)
+{
+	u16 status;
+	struct mmc_command *cmd;
+	unsigned long iflags;
+
+	if (host->suspending) { /* bad news, dangerous time */
+		dev_err(&host->pdev->dev, "****glamo_mci_irq before resumed\n");
+		return;
+	}
+
+	if (!host->mrq)
+		return;
+	cmd = host->mrq->cmd;
+	if (!cmd)
+		return;
+
+	spin_lock_irqsave(&host->complete_lock, iflags);
+
+	status = readw(host->base + GLAMO_REG_MMC_RB_STAT1);
+	dev_dbg(&host->pdev->dev, "status = 0x%04x\n", status);
+
+	/* ack this interrupt source */
+	writew(GLAMO_IRQ_MMC,
+	       glamo_mci_def_pdata.pglamo->base + GLAMO_REG_IRQ_CLEAR);
+
+	/* we ignore a data timeout report if we are also told the data came */
+	if (status & GLAMO_STAT1_MMC_RB_DRDY)
+		status &= ~GLAMO_STAT1_MMC_DTOUT;
+
+	if (status & (GLAMO_STAT1_MMC_RTOUT |
+		      GLAMO_STAT1_MMC_DTOUT))
+		cmd->error = -ETIMEDOUT;
+	if (status & (GLAMO_STAT1_MMC_BWERR |
+		      GLAMO_STAT1_MMC_BRERR))
+		cmd->error = -EILSEQ;
+	if (cmd->error) {
+		dev_info(&host->pdev->dev, "Error after cmd: 0x%x\n", status);
+		goto done;
+	}
+
+	/*
+	 * disable the initial slow start after first bulk transfer
+	 */
+	if (host->force_slow_during_powerup)
+		host->force_slow_during_powerup--;
+
+	/*
+	 * we perform the memcpy out of Glamo memory outside of IRQ context
+	 * so we don't block other interrupts
+	 */
+	schedule_work(&host->irq_work);
+
+	goto leave;
+
+done:
+	host->complete_what = COMPLETION_NONE;
+	host->mrq = NULL;
+	mmc_request_done(host->mmc, cmd->mrq);
+leave:
+	spin_unlock_irqrestore(&host->complete_lock, iflags);
+}
+
+static void glamo_mci_irq(unsigned int irq, struct irq_desc *desc)
+{
+	struct glamo_mci_host *host = (struct glamo_mci_host *)
+				      desc->handler_data;
+
+	if (host)
+		glamo_mci_irq_host(host);
+
+}
+
+static int glamo_mci_send_command(struct glamo_mci_host *host,
+				  struct mmc_command *cmd)
+{
+	u8 u8a[6];
+	u16 fire = 0;
+
+	/* if we can't do it, reject as busy */
+	if (!readw(host->base + GLAMO_REG_MMC_RB_STAT1) &
+	     GLAMO_STAT1_MMC_IDLE) {
+		host->mrq = NULL;
+		cmd->error = -EBUSY;
+		mmc_request_done(host->mmc, host->mrq);
+		return -EBUSY;
+	}
+
+	/* create an array in wire order for CRC computation */
+	u8a[0] = 0x40 | (cmd->opcode & 0x3f);
+	u8a[1] = (u8)(cmd->arg >> 24);
+	u8a[2] = (u8)(cmd->arg >> 16);
+	u8a[3] = (u8)(cmd->arg >> 8);
+	u8a[4] = (u8)cmd->arg;
+	u8a[5] = CRC7(&u8a[0], 5); /* CRC7 on first 5 bytes of packet */
+
+	/* issue the wire-order array including CRC in register order */
+	writew((u8a[4] << 8) | u8a[5], host->base + GLAMO_REG_MMC_CMD_REG1);
+	writew((u8a[2] << 8) | u8a[3], host->base + GLAMO_REG_MMC_CMD_REG2);
+	writew((u8a[0] << 8) | u8a[1], host->base + GLAMO_REG_MMC_CMD_REG3);
+
+	/* command index toggle */
+	fire |= (host->ccnt & 1) << 12;
+
+	/* set type of command */
+	switch (mmc_cmd_type(cmd)) {
+	case MMC_CMD_BC:
+		fire |= GLAMO_FIRE_MMC_CMDT_BNR;
+		break;
+	case MMC_CMD_BCR:
+		fire |= GLAMO_FIRE_MMC_CMDT_BR;
+		break;
+	case MMC_CMD_AC:
+		fire |= GLAMO_FIRE_MMC_CMDT_AND;
+		break;
+	case MMC_CMD_ADTC:
+		fire |= GLAMO_FIRE_MMC_CMDT_AD;
+		break;
+	}
+	/*
+	 * if it expects a response, set the type expected
+	 *
+	 * R1, Length  : 48bit, Normal response
+	 * R1b, Length : 48bit, same R1, but added card busy status
+	 * R2, Length  : 136bit (really 128 bits with CRC snipped)
+	 * R3, Length  : 48bit (OCR register value)
+	 * R4, Length  : 48bit, SDIO_OP_CONDITION, Reverse SDIO Card
+	 * R5, Length  : 48bit, IO_RW_DIRECTION, Reverse SDIO Card
+	 * R6, Length  : 48bit (RCA register)
+	 * R7, Length  : 48bit (interface condition, VHS(voltage supplied),
+	 *                     check pattern, CRC7)
+	 */
+	switch (mmc_resp_type(cmd)) {
+	case MMC_RSP_R6: /* same index as R7 and R1 */
+		fire |= GLAMO_FIRE_MMC_RSPT_R1;
+		break;
+	case MMC_RSP_R1B:
+		fire |= GLAMO_FIRE_MMC_RSPT_R1b;
+		break;
+	case MMC_RSP_R2:
+		fire |= GLAMO_FIRE_MMC_RSPT_R2;
+		break;
+	case MMC_RSP_R3:
+		fire |= GLAMO_FIRE_MMC_RSPT_R3;
+		break;
+	/* R4 and R5 supported by chip not defined in linux/mmc/core.h (sdio) */
+	}
+	/*
+	 * From the command index, set up the command class in the host ctrllr
+	 *
+	 * missing guys present on chip but couldn't figure out how to use yet:
+	 *     0x0 "stream read"
+	 *     0x9 "cancel running command"
+	 */
+	switch (cmd->opcode) {
+	case MMC_READ_SINGLE_BLOCK:
+		fire |= GLAMO_FIRE_MMC_CC_SBR; /* single block read */
+		break;
+	case MMC_SWITCH: /* 64 byte payload */
+	case 0x33: /* observed issued by MCI */
+	case MMC_READ_MULTIPLE_BLOCK:
+		/* we will get an interrupt off this */
+		if (!cmd->mrq->stop)
+			/* multiblock no stop */
+			fire |= GLAMO_FIRE_MMC_CC_MBRNS;
+		else
+			 /* multiblock with stop */
+			fire |= GLAMO_FIRE_MMC_CC_MBRS;
+		break;
+	case MMC_WRITE_BLOCK:
+		fire |= GLAMO_FIRE_MMC_CC_SBW; /* single block write */
+		break;
+	case MMC_WRITE_MULTIPLE_BLOCK:
+		if (cmd->mrq->stop)
+			 /* multiblock with stop */
+			fire |= GLAMO_FIRE_MMC_CC_MBWS;
+		else
+// 			 /* multiblock NO stop-- 'RESERVED'? */
+			fire |= GLAMO_FIRE_MMC_CC_MBWNS;
+		break;
+	case MMC_STOP_TRANSMISSION:
+		fire |= GLAMO_FIRE_MMC_CC_STOP; /* STOP */
+		break;
+	default:
+		fire |= GLAMO_FIRE_MMC_CC_BASIC; /* "basic command" */
+		break;
+	}
+
+	/* always largest timeout */
+	writew(0xfff, host->base + GLAMO_REG_MMC_TIMEOUT);
+
+	/* Generate interrupt on txfer */
+	writew((readw(host->base + GLAMO_REG_MMC_BASIC) & 0x3e) |
+		   0x0800 | GLAMO_BASIC_MMC_NO_CLK_RD_WAIT |
+		   GLAMO_BASIC_MMC_EN_COMPL_INT | (sd_drive << 6),
+		   host->base + GLAMO_REG_MMC_BASIC);
+
+	/* send the command out on the wire */
+	/* dev_info(&host->pdev->dev, "Using FIRE %04X\n", fire); */
+	writew(fire, host->base + GLAMO_REG_MMC_CMD_FIRE);
+	cmd->error = 0;
+	return 0;
+}
+
+static int glamo_mci_prepare_pio(struct glamo_mci_host *host,
+				 struct mmc_data *data)
+{
+	/*
+	 * the S-Media-internal RAM offset for our MMC buffer
+	 * Read is halfway up the buffer and write is at the start
+	 */
+	if (data->flags & MMC_DATA_READ) {
+		writew((u16)(GLAMO_FB_SIZE + (RESSIZE(host->mem_data) / 2)),
+			   host->base + GLAMO_REG_MMC_WDATADS1);
+		writew((u16)((GLAMO_FB_SIZE +
+					(RESSIZE(host->mem_data) / 2)) >> 16),
+			   host->base + GLAMO_REG_MMC_WDATADS2);
+	} else {
+		writew((u16)GLAMO_FB_SIZE, host->base +
+					       GLAMO_REG_MMC_RDATADS1);
+		writew((u16)(GLAMO_FB_SIZE >> 16), host->base +
+						       GLAMO_REG_MMC_RDATADS2);
+	}
+
+	/* set up the block info */
+	writew(data->blksz, host->base + GLAMO_REG_MMC_DATBLKLEN);
+	writew(data->blocks, host->base + GLAMO_REG_MMC_DATBLKCNT);
+	dev_dbg(&host->pdev->dev, "(blksz=%d, count=%d)\n",
+				   data->blksz, data->blocks);
+	host->pio_sgptr = 0;
+	host->pio_words = 0;
+	host->pio_count = 0;
+	host->pio_active = 0;
+	/* if write, prep the write into the shared RAM before the command */
+	if (data->flags & MMC_DATA_WRITE) {
+		host->pio_active = XFER_WRITE;
+		return do_pio_write(host);
+	}
+	host->pio_active = XFER_READ;
+	return 0;
+}
+
+static void glamo_mci_send_request(struct mmc_host *mmc)
+{
+	struct glamo_mci_host *host = mmc_priv(mmc);
+	struct mmc_request *mrq = host->mrq;
+	struct mmc_command *cmd = host->cmd_is_stop ? mrq->stop : mrq->cmd;
+	u16 * pu16 = (u16 *)&cmd->resp[0];
+	u16 * reg_resp = (u16 *)(host->base + GLAMO_REG_MMC_CMD_RSP1);
+	u16 status;
+	int n;
+	int timeout = 1000000;
+	int insanity_timeout = 1000000;
+
+	if (host->suspending) {
+		dev_err(&host->pdev->dev, "IGNORING glamo_mci_send_request while "
+								 "suspended\n");
+		cmd->error = -EIO;
+		if (cmd->data)
+			cmd->data->error = -EIO;
+		mmc_request_done(mmc, mrq);
+		return;
+	}
+
+	host->ccnt++;
+	/*
+	 * somehow 2.6.24 MCI manages to issue MMC_WRITE_BLOCK *without* the
+	 * MMC_DATA_WRITE flag, WTF?  Work around the madness.
+	 */
+	if (cmd->opcode == MMC_WRITE_BLOCK)
+		if (mrq->data)
+			mrq->data->flags |= MMC_DATA_WRITE;
+
+	 /* this guy has data to read/write? */
+	if ((!host->cmd_is_stop) && cmd->data) {
+		int res;
+		host->dcnt++;
+		res = glamo_mci_prepare_pio(host, cmd->data);
+		if (res) {
+			cmd->error = -EIO;
+			cmd->data->error = -EIO;
+			mmc_request_done(mmc, mrq);
+			return;
+		}
+	}
+
+	dev_dbg(&host->pdev->dev,"cmd 0x%x, "
+		 "arg 0x%x data=%p mrq->stop=%p flags 0x%x\n",
+		 cmd->opcode, cmd->arg, cmd->data, cmd->mrq->stop,
+		 cmd->flags);
+
+	/* resume requested clock rate
+	 * scale it down by sd_slow_ratio if platform requests it
+	 */
+	__glamo_mci_fix_card_div(host, host->clk_div);
+
+	if (glamo_mci_send_command(host, cmd))
+		goto bail;
+
+	/* we are deselecting card?  because it isn't going to ack then... */
+	if ((cmd->opcode == 7) && (cmd->arg == 0))
+		goto done;
+
+	/*
+	 * we must spin until response is ready or timed out
+	 * -- we don't get interrupts unless there is a bulk rx
+	 */
+	do
+		status = readw(host->base + GLAMO_REG_MMC_RB_STAT1);
+	while (((((status >> 15) & 1) != (host->ccnt & 1)) ||
+		(!(status & (GLAMO_STAT1_MMC_RB_RRDY |
+			     GLAMO_STAT1_MMC_RTOUT |
+			     GLAMO_STAT1_MMC_DTOUT |
+			     GLAMO_STAT1_MMC_BWERR |
+			     GLAMO_STAT1_MMC_BRERR)))) && (insanity_timeout--));
+
+	if (insanity_timeout < 0)
+		dev_info(&host->pdev->dev, "command timeout, continuing\n");
+
+	if (status & (GLAMO_STAT1_MMC_RTOUT |
+		      GLAMO_STAT1_MMC_DTOUT))
+		cmd->error = -ETIMEDOUT;
+	if (status & (GLAMO_STAT1_MMC_BWERR |
+		      GLAMO_STAT1_MMC_BRERR))
+		cmd->error = -EILSEQ;
+
+	if (host->cmd_is_stop)
+		goto bail;
+
+	if (cmd->error) {
+		dev_info(&host->pdev->dev, "Error after cmd: 0x%x\n", status);
+		goto done;
+	}
+	/*
+	 * mangle the response registers in two different exciting
+	 * undocumented ways discovered by trial and error
+	 */
+	if (mmc_resp_type(cmd) == MMC_RSP_R2)
+		/* grab the response */
+		for (n = 0; n < 8; n++) /* super mangle power 1 */
+			pu16[n ^ 6] = readw(&reg_resp[n]);
+	else
+		for (n = 0; n < 3; n++) /* super mangle power 2 */
+			pu16[n] = (readw(&reg_resp[n]) >> 8) |
+				  (readw(&reg_resp[n + 1]) << 8);
+	/*
+	 * if we don't have bulk data to take care of, we're done
+	 */
+	if (!cmd->data)
+		goto done;
+	if (!(cmd->data->flags & (MMC_DATA_READ | MMC_DATA_WRITE)))
+		goto done;
+
+	/*
+	 * Otherwise can can use the interrupt as async completion --
+	 * if there is read data coming, or we wait for write data to complete,
+	 * exit without mmc_request_done() as the payload interrupt
+	 * will service it
+	 */
+	dev_dbg(&host->pdev->dev, "Waiting for payload data\n");
+	/*
+	 * if the glamo INT# line isn't wired (*cough* it can happen)
+	 * I'm afraid we have to spin on the IRQ status bit and "be
+	 * our own INT# line"
+	 */
+	if (!glamo_mci_def_pdata.pglamo->irq_works) {
+		/*
+		 * we have faith we will get an "interrupt"...
+		 * but something insane like suspend problems can mean
+		 * we spin here forever, so we timeout after a LONG time
+		 */
+		while ((!(readw(glamo_mci_def_pdata.pglamo->base +
+			 GLAMO_REG_IRQ_STATUS) & GLAMO_IRQ_MMC)) &&
+		       (timeout--))
+			;
+
+		if (timeout < 0) {
+			if (cmd->data->error)
+				cmd->data->error = -ETIMEDOUT;
+			dev_err(&host->pdev->dev, "Payload timeout\n");
+			goto bail;
+		}
+
+		/* yay we are an interrupt controller! -- call the ISR
+		 * it will stop clock to card
+		 */
+		glamo_mci_irq_host(host);
+	}
+	return;
+
+done:
+	host->complete_what = COMPLETION_NONE;
+	host->mrq = NULL;
+	mmc_request_done(host->mmc, cmd->mrq);
+bail:
+	if (!sd_idleclk && !host->force_slow_during_powerup)
+		/* stop the clock to card */
+		__glamo_mci_fix_card_div(host, -1);
+}
+
+static void glamo_mci_request(struct mmc_host *mmc, struct mmc_request *mrq)
+{
+	struct glamo_mci_host *host = mmc_priv(mmc);
+
+	host->cmd_is_stop = 0;
+	host->mrq = mrq;
+	glamo_mci_send_request(mmc);
+}
+
+#if 1
+static void glamo_mci_reset(struct glamo_mci_host *host)
+{
+	if (host->suspending) {
+		dev_err(&host->pdev->dev, "IGNORING glamo_mci_reset while "
+								 "suspended\n");
+		return;
+	}
+	dev_dbg(&host->pdev->dev, "******* glamo_mci_reset\n");
+	/* reset MMC controller */
+	writew(GLAMO_CLOCK_MMC_RESET | GLAMO_CLOCK_MMC_DG_TCLK |
+		   GLAMO_CLOCK_MMC_EN_TCLK | GLAMO_CLOCK_MMC_DG_M9CLK |
+		   GLAMO_CLOCK_MMC_EN_M9CLK,
+		   glamo_mci_def_pdata.pglamo->base + GLAMO_REG_CLOCK_MMC);
+	udelay(10);
+	/* and disable reset */
+	writew(GLAMO_CLOCK_MMC_DG_TCLK |
+		   GLAMO_CLOCK_MMC_EN_TCLK | GLAMO_CLOCK_MMC_DG_M9CLK |
+		   GLAMO_CLOCK_MMC_EN_M9CLK,
+		   glamo_mci_def_pdata.pglamo->base + GLAMO_REG_CLOCK_MMC);
+}
+#endif
+static inline int glamo_mci_get_mv(int vdd)
+{
+	int mv = 1650;
+
+	if (vdd > 7)
+		mv += 350 + 100 * (vdd - 8);
+
+	return mv;
+}
+
+static void glamo_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
+{
+	struct glamo_mci_host *host = mmc_priv(mmc);
+	struct regulator *regulator;
+	int n = 0;
+	int div;
+	int powering = 0;
+	int mv;
+
+	if (host->suspending) {
+		dev_err(&host->pdev->dev, "IGNORING glamo_mci_set_ios while "
+								 "suspended\n");
+		return;
+	}
+
+	regulator = host->regulator;
+
+	/* Set power */
+	switch(ios->power_mode) {
+	case MMC_POWER_UP:
+		if (host->pdata->glamo_can_set_mci_power()) {
+			mv = glamo_mci_get_mv(ios->vdd);
+			regulator_set_voltage(regulator, mv * 1000, mv * 1000);
+			regulator_enable(regulator);
+		}
+		break;
+	case MMC_POWER_ON:
+		/*
+		 * we should use very slow clock until first bulk
+		 * transfer completes OK
+		 */
+		host->force_slow_during_powerup = 1;
+
+		if (host->vdd_current != ios->vdd) {
+			if (host->pdata->glamo_can_set_mci_power()) {
+				mv = glamo_mci_get_mv(ios->vdd);
+				regulator_set_voltage(regulator, mv * 1000, mv * 1000);
+				printk(KERN_INFO "SD power -> %dmV\n", mv);
+			}
+			host->vdd_current = ios->vdd;
+		}
+		if (host->power_mode_current == MMC_POWER_OFF) {
+			glamo_engine_enable(glamo_mci_def_pdata.pglamo,
+							      GLAMO_ENGINE_MMC);
+			powering = 1;
+		}
+		break;
+
+	case MMC_POWER_OFF:
+	default:
+		if (host->power_mode_current == MMC_POWER_OFF)
+			break;
+		/* never want clocking with dead card */
+		__glamo_mci_fix_card_div(host, -1);
+
+		glamo_engine_disable(glamo_mci_def_pdata.pglamo,
+				     GLAMO_ENGINE_MMC);
+		regulator_disable(regulator);
+		host->vdd_current = -1;
+		break;
+	}
+	host->power_mode_current = ios->power_mode;
+
+	host->real_rate = __glamo_mci_set_card_clock(host, ios->clock, &div);
+	host->clk_div = div;
+
+	/* after power-up, we are meant to give it >= 74 clocks so it can
+	 * initialize itself.  Doubt any modern cards need it but anyway...
+	 */
+	if (powering)
+		mdelay(1);
+
+	if (!sd_idleclk && !host->force_slow_during_powerup)
+		/* stop the clock to card, because we are idle until transfer */
+		__glamo_mci_fix_card_div(host, -1);
+
+	if ((ios->power_mode == MMC_POWER_ON) ||
+	    (ios->power_mode == MMC_POWER_UP)) {
+		dev_info(&host->pdev->dev,
+			"powered (vdd = %d) clk: %lukHz div=%d (req: %ukHz). "
+			"Bus width=%d\n",(int)ios->vdd,
+			host->real_rate / 1000, (int)host->clk_div,
+			ios->clock / 1000, (int)ios->bus_width);
+	} else
+		dev_info(&host->pdev->dev, "glamo_mci_set_ios: power down.\n");
+
+	/* set bus width */
+	host->bus_width = ios->bus_width;
+	if (host->bus_width == MMC_BUS_WIDTH_4)
+		n = GLAMO_BASIC_MMC_EN_4BIT_DATA;
+	writew((readw(host->base + GLAMO_REG_MMC_BASIC) &
+					  (~(GLAMO_BASIC_MMC_EN_4BIT_DATA |
+					     GLAMO_BASIC_MMC_EN_DR_STR0 |
+					     GLAMO_BASIC_MMC_EN_DR_STR1))) | n |
+			       sd_drive << 6, host->base + GLAMO_REG_MMC_BASIC);
+}
+
+
+/*
+ * no physical write protect supported by us
+ */
+static int glamo_mci_get_ro(struct mmc_host *mmc)
+{
+	return 0;
+}
+
+static struct mmc_host_ops glamo_mci_ops = {
+	.request	= glamo_mci_request,
+	.set_ios	= glamo_mci_set_ios,
+	.get_ro		= glamo_mci_get_ro,
+};
+
+static int glamo_mci_probe(struct platform_device *pdev)
+{
+	struct mmc_host 	*mmc;
+	struct glamo_mci_host 	*host;
+	int ret;
+
+	dev_info(&pdev->dev, "glamo_mci driver (C)2007 Openmoko, Inc\n");
+
+	mmc = mmc_alloc_host(sizeof(struct glamo_mci_host), &pdev->dev);
+	if (!mmc) {
+		ret = -ENOMEM;
+		goto probe_out;
+	}
+
+	host = mmc_priv(mmc);
+	host->mmc = mmc;
+	host->pdev = pdev;
+	host->pdata = &glamo_mci_def_pdata;
+	host->power_mode_current = MMC_POWER_OFF;
+
+	host->complete_what = COMPLETION_NONE;
+	host->pio_active = XFER_NONE;
+
+	spin_lock_init(&host->complete_lock);
+	INIT_WORK(&host->irq_work, glamo_mci_irq_worker);
+
+	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->regulator = regulator_get(&pdev->dev, "SD_3V3");
+	if (!host->regulator) {
+		dev_err(&pdev->dev, "Cannot proceed without regulator.\n");
+		return -ENODEV;
+	}
+
+	/* set the handler for our bit of the shared chip irq register */
+	set_irq_handler(IRQ_GLAMO(GLAMO_IRQIDX_MMC), glamo_mci_irq);
+	/* stash host as our handler's private data */
+	set_irq_data(IRQ_GLAMO(GLAMO_IRQIDX_MMC), host);
+
+	/* Get ahold of our data buffer we use for data in and out on MMC */
+	host->mem_data = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	if (!host->mem_data) {
+		dev_err(&pdev->dev,
+			"failed to get io memory region resource.\n");
+		ret = -ENOENT;
+		goto probe_iounmap;
+	}
+
+	host->mem_data = request_mem_region(host->mem_data->start,
+		RESSIZE(host->mem_data), pdev->name);
+
+	if (!host->mem_data) {
+		dev_err(&pdev->dev, "failed to request io memory region.\n");
+		ret = -ENOENT;
+		goto probe_iounmap;
+	}
+	host->base_data = ioremap(host->mem_data->start,
+					  RESSIZE(host->mem_data));
+	host->data_max_size = RESSIZE(host->mem_data);
+
+	if (host->base_data == 0) {
+		dev_err(&pdev->dev, "failed to ioremap() io memory region.\n");
+		ret = -EINVAL;
+		goto probe_free_mem_region_data;
+	}
+
+	host->vdd_current = 0;
+	host->clk_rate = 50000000; /* really it's 49152000 */
+	host->clk_div = 16;
+
+	/* explain our host controller capabilities */
+	mmc->ops 	= &glamo_mci_ops;
+	mmc->ocr_avail	= host->pdata->ocr_avail;
+	mmc->caps	= MMC_CAP_4_BIT_DATA |
+			  MMC_CAP_MMC_HIGHSPEED |
+			  MMC_CAP_SD_HIGHSPEED;
+	mmc->f_min 	= host->clk_rate / 256;
+	mmc->f_max 	= sd_max_clk;
+
+	mmc->max_blk_count	= (1 << 16) - 1; /* GLAMO_REG_MMC_RB_BLKCNT */
+	mmc->max_blk_size	= (1 << 12) - 1; /* GLAMO_REG_MMC_RB_BLKLEN */
+	mmc->max_req_size	= RESSIZE(host->mem_data) / 2;
+	mmc->max_seg_size	= mmc->max_req_size;
+	mmc->max_phys_segs	= 1; /* hw doesn't talk about segs??? */
+	mmc->max_hw_segs	= 1;
+
+	dev_info(&host->pdev->dev, "probe: mapped mci_base:%p irq:%u.\n",
+		host->base, host->irq);
+
+	platform_set_drvdata(pdev, mmc);
+
+	glamo_engine_enable(glamo_mci_def_pdata.pglamo, GLAMO_ENGINE_MMC);
+	glamo_mci_reset(host);
+
+	if ((ret = mmc_add_host(mmc))) {
+		dev_err(&pdev->dev, "failed to add mmc host.\n");
+		goto probe_free_mem_region_data;
+	}
+
+	dev_info(&pdev->dev,"initialisation done.\n");
+	return 0;
+
+ probe_free_mem_region_data:
+	release_mem_region(host->mem_data->start, RESSIZE(host->mem_data));
+
+ 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 glamo_mci_remove(struct platform_device *pdev)
+{
+	struct mmc_host 	*mmc  = platform_get_drvdata(pdev);
+	struct glamo_mci_host 	*host = mmc_priv(mmc);
+	struct regulator *regulator;
+
+	mmc_remove_host(mmc);
+	/* stop using our handler, revert it to default */
+	set_irq_handler(IRQ_GLAMO(GLAMO_IRQIDX_MMC), handle_level_irq);
+	iounmap(host->base);
+	iounmap(host->base_data);
+	release_mem_region(host->mem->start, RESSIZE(host->mem));
+	release_mem_region(host->mem_data->start, RESSIZE(host->mem_data));
+
+	regulator = host->regulator;
+	regulator_put(regulator);
+	
+	mmc_free_host(mmc);
+
+	glamo_engine_disable(glamo_mci_def_pdata.pglamo, GLAMO_ENGINE_MMC);
+	return 0;
+}
+
+
+#ifdef CONFIG_PM
+
+static int glamo_mci_suspend(struct platform_device *dev, pm_message_t state)
+{
+	struct mmc_host *mmc = platform_get_drvdata(dev);
+	struct glamo_mci_host 	*host = mmc_priv(mmc);
+	int ret;
+
+	cancel_work_sync(&host->irq_work);
+
+	/*
+	 * possible workaround for SD corruption during suspend - resume
+	 * make sure the clock was running during suspend and consequently
+	 * resume
+	 */
+	__glamo_mci_fix_card_div(host, host->clk_div);
+
+	/* we are going to do more commands to override this in
+	 * mmc_suspend_host(), so we need to change sd_idleclk for the
+	 * duration as well
+	 */
+	suspend_sd_idleclk = sd_idleclk;
+	sd_idleclk = 1;
+
+	ret = mmc_suspend_host(mmc, state);
+
+	host->suspending++;
+	/* so that when we resume, we use any modified max rate */
+	mmc->f_max = sd_max_clk;
+
+	return ret;
+}
+
+int glamo_mci_resume(struct platform_device *dev)
+{
+	struct mmc_host *mmc = platform_get_drvdata(dev);
+	struct glamo_mci_host 	*host = mmc_priv(mmc);
+	int ret;
+
+	sd_idleclk = 1;
+
+	glamo_engine_enable(host->pdata->pglamo, GLAMO_ENGINE_MMC);
+	glamo_mci_reset(host);
+
+	host->suspending--;
+
+	ret = mmc_resume_host(mmc);
+
+	/* put sd_idleclk back to pre-suspend state */
+	sd_idleclk = suspend_sd_idleclk;
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(glamo_mci_resume);
+
+#else /* CONFIG_PM */
+#define glamo_mci_suspend NULL
+#define glamo_mci_resume NULL
+#endif /* CONFIG_PM */
+
+
+static struct platform_driver glamo_mci_driver =
+{
+	.driver.name	= "glamo-mci",
+	.probe		= glamo_mci_probe,
+	.remove		= glamo_mci_remove,
+	.suspend	= glamo_mci_suspend,
+	.resume		= glamo_mci_resume,
+};
+
+static int __init glamo_mci_init(void)
+{
+	spin_lock_init(&clock_lock);
+	platform_driver_register(&glamo_mci_driver);
+	return 0;
+}
+
+static void __exit glamo_mci_exit(void)
+{
+	platform_driver_unregister(&glamo_mci_driver);
+}
+
+module_init(glamo_mci_init);
+module_exit(glamo_mci_exit);
+
+MODULE_DESCRIPTION("Glamo MMC/SD Card Interface driver");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Andy Green <andy@openmoko.com>");