Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 1651 insertions, 0 deletions

diff --git a/drivers/mmc/wbsd.c b/drivers/mmc/wbsd.c
new file mode 100644
index 000000000000..938bca0414e5
--- /dev/null
+++ b/drivers/mmc/wbsd.c
@@ -0,0 +1,1651 @@
+/*
+ *  linux/drivers/mmc/wbsd.c - Winbond W83L51xD SD/MMC driver
+ *
+ *  Copyright (C) 2004-2005 Pierre Ossman, 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.
+ *
+ *
+ * Warning!
+ *
+ * Changes to the FIFO system should be done with extreme care since
+ * the hardware is full of bugs related to the FIFO. Known issues are:
+ *
+ * - FIFO size field in FSR is always zero.
+ *
+ * - FIFO interrupts tend not to work as they should. Interrupts are
+ *   triggered only for full/empty events, not for threshold values.
+ *
+ * - On APIC systems the FIFO empty interrupt is sometimes lost.
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/device.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/highmem.h>
+#include <linux/mmc/host.h>
+#include <linux/mmc/protocol.h>
+
+#include <asm/io.h>
+#include <asm/dma.h>
+#include <asm/scatterlist.h>
+
+#include "wbsd.h"
+
+#define DRIVER_NAME "wbsd"
+#define DRIVER_VERSION "1.1"
+
+#ifdef CONFIG_MMC_DEBUG
+#define DBG(x...) \
+	printk(KERN_DEBUG DRIVER_NAME ": " x)
+#define DBGF(f, x...) \
+	printk(KERN_DEBUG DRIVER_NAME " [%s()]: " f, __func__ , ##x)
+#else
+#define DBG(x...)	do { } while (0)
+#define DBGF(x...)	do { } while (0)
+#endif
+
+static unsigned int io = 0x248;
+static unsigned int irq = 6;
+static int dma = 2;
+
+#ifdef CONFIG_MMC_DEBUG
+void DBG_REG(int reg, u8 value)
+{
+	int i;
+	
+	printk(KERN_DEBUG "wbsd: Register %d: 0x%02X %3d '%c' ",
+		reg, (int)value, (int)value, (value < 0x20)?'.':value);
+	
+	for (i = 7;i >= 0;i--)
+	{
+		if (value & (1 << i))
+			printk("x");
+		else
+			printk(".");
+	}
+	
+	printk("\n");
+}
+#else
+#define DBG_REG(r, v) do {}  while (0)
+#endif
+
+/*
+ * Basic functions
+ */
+
+static inline void wbsd_unlock_config(struct wbsd_host* host)
+{
+	outb(host->unlock_code, host->config);
+	outb(host->unlock_code, host->config);
+}
+
+static inline void wbsd_lock_config(struct wbsd_host* host)
+{
+	outb(LOCK_CODE, host->config);
+}
+
+static inline void wbsd_write_config(struct wbsd_host* host, u8 reg, u8 value)
+{
+	outb(reg, host->config);
+	outb(value, host->config + 1);
+}
+
+static inline u8 wbsd_read_config(struct wbsd_host* host, u8 reg)
+{
+	outb(reg, host->config);
+	return inb(host->config + 1);
+}
+
+static inline void wbsd_write_index(struct wbsd_host* host, u8 index, u8 value)
+{
+	outb(index, host->base + WBSD_IDXR);
+	outb(value, host->base + WBSD_DATAR);
+}
+
+static inline u8 wbsd_read_index(struct wbsd_host* host, u8 index)
+{
+	outb(index, host->base + WBSD_IDXR);
+	return inb(host->base + WBSD_DATAR);
+}
+
+/*
+ * Common routines
+ */
+
+static void wbsd_init_device(struct wbsd_host* host)
+{
+	u8 setup, ier;
+	
+	/*
+	 * Reset chip (SD/MMC part) and fifo.
+	 */
+	setup = wbsd_read_index(host, WBSD_IDX_SETUP);
+	setup |= WBSD_FIFO_RESET | WBSD_SOFT_RESET;
+	wbsd_write_index(host, WBSD_IDX_SETUP, setup);
+	
+	/*
+	 * Read back default clock.
+	 */
+	host->clk = wbsd_read_index(host, WBSD_IDX_CLK);
+
+	/*
+	 * Power down port.
+	 */
+	outb(WBSD_POWER_N, host->base + WBSD_CSR);
+	
+	/*
+	 * Set maximum timeout.
+	 */
+	wbsd_write_index(host, WBSD_IDX_TAAC, 0x7F);
+	
+	/*
+	 * Enable interesting interrupts.
+	 */
+	ier = 0;
+	ier |= WBSD_EINT_CARD;
+	ier |= WBSD_EINT_FIFO_THRE;
+	ier |= WBSD_EINT_CCRC;
+	ier |= WBSD_EINT_TIMEOUT;
+	ier |= WBSD_EINT_CRC;
+	ier |= WBSD_EINT_TC;
+
+	outb(ier, host->base + WBSD_EIR);
+
+	/*
+	 * Clear interrupts.
+	 */
+	inb(host->base + WBSD_ISR);
+}
+
+static void wbsd_reset(struct wbsd_host* host)
+{
+	u8 setup;
+	
+	printk(KERN_ERR DRIVER_NAME ": Resetting chip\n");
+	
+	/*
+	 * Soft reset of chip (SD/MMC part).
+	 */
+	setup = wbsd_read_index(host, WBSD_IDX_SETUP);
+	setup |= WBSD_SOFT_RESET;
+	wbsd_write_index(host, WBSD_IDX_SETUP, setup);
+}
+
+static void wbsd_request_end(struct wbsd_host* host, struct mmc_request* mrq)
+{
+	unsigned long dmaflags;
+	
+	DBGF("Ending request, cmd (%x)\n", mrq->cmd->opcode);
+	
+	if (host->dma >= 0)
+	{
+		/*
+		 * Release ISA DMA controller.
+		 */
+		dmaflags = claim_dma_lock();
+		disable_dma(host->dma);
+		clear_dma_ff(host->dma);
+		release_dma_lock(dmaflags);
+
+		/*
+		 * Disable DMA on host.
+		 */
+		wbsd_write_index(host, WBSD_IDX_DMA, 0);
+	}
+	
+	host->mrq = NULL;
+
+	/*
+	 * MMC layer might call back into the driver so first unlock.
+	 */
+	spin_unlock(&host->lock);
+	mmc_request_done(host->mmc, mrq);
+	spin_lock(&host->lock);
+}
+
+/*
+ * Scatter/gather functions
+ */
+
+static inline void wbsd_init_sg(struct wbsd_host* host, struct mmc_data* data)
+{
+	/*
+	 * Get info. about SG list from data structure.
+	 */
+	host->cur_sg = data->sg;
+	host->num_sg = data->sg_len;
+
+	host->offset = 0;
+	host->remain = host->cur_sg->length;
+}
+
+static inline int wbsd_next_sg(struct wbsd_host* host)
+{
+	/*
+	 * Skip to next SG entry.
+	 */
+	host->cur_sg++;
+	host->num_sg--;
+
+	/*
+	 * Any entries left?
+	 */
+	if (host->num_sg > 0)
+	  {
+	    host->offset = 0;
+	    host->remain = host->cur_sg->length;
+	  }
+	
+	return host->num_sg;
+}
+
+static inline char* wbsd_kmap_sg(struct wbsd_host* host)
+{
+	host->mapped_sg = kmap_atomic(host->cur_sg->page, KM_BIO_SRC_IRQ) +
+		host->cur_sg->offset;
+	return host->mapped_sg;
+}
+
+static inline void wbsd_kunmap_sg(struct wbsd_host* host)
+{
+	kunmap_atomic(host->mapped_sg, KM_BIO_SRC_IRQ);
+}
+
+static inline void wbsd_sg_to_dma(struct wbsd_host* host, struct mmc_data* data)
+{
+	unsigned int len, i, size;
+	struct scatterlist* sg;
+	char* dmabuf = host->dma_buffer;
+	char* sgbuf;
+	
+	size = host->size;
+	
+	sg = data->sg;
+	len = data->sg_len;
+	
+	/*
+	 * Just loop through all entries. Size might not
+	 * be the entire list though so make sure that
+	 * we do not transfer too much.
+	 */
+	for (i = 0;i < len;i++)
+	{
+		sgbuf = kmap_atomic(sg[i].page, KM_BIO_SRC_IRQ) + sg[i].offset;
+		if (size < sg[i].length)
+			memcpy(dmabuf, sgbuf, size);
+		else
+			memcpy(dmabuf, sgbuf, sg[i].length);
+		kunmap_atomic(sgbuf, KM_BIO_SRC_IRQ);
+		dmabuf += sg[i].length;
+		
+		if (size < sg[i].length)
+			size = 0;
+		else
+			size -= sg[i].length;
+	
+		if (size == 0)
+			break;
+	}
+	
+	/*
+	 * Check that we didn't get a request to transfer
+	 * more data than can fit into the SG list.
+	 */
+	
+	BUG_ON(size != 0);
+	
+	host->size -= size;
+}
+
+static inline void wbsd_dma_to_sg(struct wbsd_host* host, struct mmc_data* data)
+{
+	unsigned int len, i, size;
+	struct scatterlist* sg;
+	char* dmabuf = host->dma_buffer;
+	char* sgbuf;
+	
+	size = host->size;
+	
+	sg = data->sg;
+	len = data->sg_len;
+	
+	/*
+	 * Just loop through all entries. Size might not
+	 * be the entire list though so make sure that
+	 * we do not transfer too much.
+	 */
+	for (i = 0;i < len;i++)
+	{
+		sgbuf = kmap_atomic(sg[i].page, KM_BIO_SRC_IRQ) + sg[i].offset;
+		if (size < sg[i].length)
+			memcpy(sgbuf, dmabuf, size);
+		else
+			memcpy(sgbuf, dmabuf, sg[i].length);
+		kunmap_atomic(sgbuf, KM_BIO_SRC_IRQ);
+		dmabuf += sg[i].length;
+		
+		if (size < sg[i].length)
+			size = 0;
+		else
+			size -= sg[i].length;
+		
+		if (size == 0)
+			break;
+	}
+	
+	/*
+	 * Check that we didn't get a request to transfer
+	 * more data than can fit into the SG list.
+	 */
+	
+	BUG_ON(size != 0);
+	
+	host->size -= size;
+}
+
+/*
+ * Command handling
+ */
+ 
+static inline void wbsd_get_short_reply(struct wbsd_host* host,
+	struct mmc_command* cmd)
+{
+	/*
+	 * Correct response type?
+	 */
+	if (wbsd_read_index(host, WBSD_IDX_RSPLEN) != WBSD_RSP_SHORT)
+	{
+		cmd->error = MMC_ERR_INVALID;
+		return;
+	}
+	
+	cmd->resp[0] =
+		wbsd_read_index(host, WBSD_IDX_RESP12) << 24;
+	cmd->resp[0] |=
+		wbsd_read_index(host, WBSD_IDX_RESP13) << 16;
+	cmd->resp[0] |=
+		wbsd_read_index(host, WBSD_IDX_RESP14) << 8;
+	cmd->resp[0] |=
+		wbsd_read_index(host, WBSD_IDX_RESP15) << 0;
+	cmd->resp[1] =
+		wbsd_read_index(host, WBSD_IDX_RESP16) << 24;
+}
+
+static inline void wbsd_get_long_reply(struct wbsd_host* host,
+	struct mmc_command* cmd)
+{
+	int i;
+	
+	/*
+	 * Correct response type?
+	 */
+	if (wbsd_read_index(host, WBSD_IDX_RSPLEN) != WBSD_RSP_LONG)
+	{
+		cmd->error = MMC_ERR_INVALID;
+		return;
+	}
+	
+	for (i = 0;i < 4;i++)
+	{
+		cmd->resp[i] =
+			wbsd_read_index(host, WBSD_IDX_RESP1 + i * 4) << 24;
+		cmd->resp[i] |=
+			wbsd_read_index(host, WBSD_IDX_RESP2 + i * 4) << 16;
+		cmd->resp[i] |=
+			wbsd_read_index(host, WBSD_IDX_RESP3 + i * 4) << 8;
+		cmd->resp[i] |=
+			wbsd_read_index(host, WBSD_IDX_RESP4 + i * 4) << 0;
+	}
+}
+
+static irqreturn_t wbsd_irq(int irq, void *dev_id, struct pt_regs *regs);
+
+static void wbsd_send_command(struct wbsd_host* host, struct mmc_command* cmd)
+{
+	int i;
+	u8 status, isr;
+	
+	DBGF("Sending cmd (%x)\n", cmd->opcode);
+
+	/*
+	 * Clear accumulated ISR. The interrupt routine
+	 * will fill this one with events that occur during
+	 * transfer.
+	 */
+	host->isr = 0;
+	
+	/*
+	 * Send the command (CRC calculated by host).
+	 */
+	outb(cmd->opcode, host->base + WBSD_CMDR);
+	for (i = 3;i >= 0;i--)
+		outb((cmd->arg >> (i * 8)) & 0xff, host->base + WBSD_CMDR);
+	
+	cmd->error = MMC_ERR_NONE;
+	
+	/*
+	 * Wait for the request to complete.
+	 */
+	do {
+		status = wbsd_read_index(host, WBSD_IDX_STATUS);
+	} while (status & WBSD_CARDTRAFFIC);
+
+	/*
+	 * Do we expect a reply?
+	 */
+	if ((cmd->flags & MMC_RSP_MASK) != MMC_RSP_NONE)
+	{
+		/*
+		 * Read back status.
+		 */
+		isr = host->isr;
+		
+		/* Card removed? */
+		if (isr & WBSD_INT_CARD)
+			cmd->error = MMC_ERR_TIMEOUT;
+		/* Timeout? */
+		else if (isr & WBSD_INT_TIMEOUT)
+			cmd->error = MMC_ERR_TIMEOUT;
+		/* CRC? */
+		else if ((cmd->flags & MMC_RSP_CRC) && (isr & WBSD_INT_CRC))
+			cmd->error = MMC_ERR_BADCRC;
+		/* All ok */
+		else
+		{
+			if ((cmd->flags & MMC_RSP_MASK) == MMC_RSP_SHORT)
+				wbsd_get_short_reply(host, cmd);
+			else
+				wbsd_get_long_reply(host, cmd);
+		}
+	}
+
+	DBGF("Sent cmd (%x), res %d\n", cmd->opcode, cmd->error);
+}
+
+/*
+ * Data functions
+ */
+
+static void wbsd_empty_fifo(struct wbsd_host* host)
+{
+	struct mmc_data* data = host->mrq->cmd->data;
+	char* buffer;
+	int i, fsr, fifo;
+	
+	/*
+	 * Handle excessive data.
+	 */
+	if (data->bytes_xfered == host->size)
+		return;
+	
+	buffer = wbsd_kmap_sg(host) + host->offset;
+
+	/*
+	 * Drain the fifo. This has a tendency to loop longer
+	 * than the FIFO length (usually one block).
+	 */
+	while (!((fsr = inb(host->base + WBSD_FSR)) & WBSD_FIFO_EMPTY))
+	{
+		/*
+		 * The size field in the FSR is broken so we have to
+		 * do some guessing.
+		 */		
+		if (fsr & WBSD_FIFO_FULL)
+			fifo = 16;
+		else if (fsr & WBSD_FIFO_FUTHRE)
+			fifo = 8;
+		else
+			fifo = 1;
+		
+		for (i = 0;i < fifo;i++)
+		{
+			*buffer = inb(host->base + WBSD_DFR);
+			buffer++;
+			host->offset++;
+			host->remain--;
+
+			data->bytes_xfered++;
+			
+			/*
+			 * Transfer done?
+			 */
+			if (data->bytes_xfered == host->size)
+			{
+				wbsd_kunmap_sg(host);				
+				return;
+			}
+			
+			/*
+			 * End of scatter list entry?
+			 */
+			if (host->remain == 0)
+			{
+				wbsd_kunmap_sg(host);
+				
+				/*
+				 * Get next entry. Check if last.
+				 */
+				if (!wbsd_next_sg(host))
+				{
+					/*
+					 * We should never reach this point.
+					 * It means that we're trying to
+					 * transfer more blocks than can fit
+					 * into the scatter list.
+					 */
+					BUG_ON(1);
+					
+					host->size = data->bytes_xfered;
+					
+					return;
+				}
+				
+				buffer = wbsd_kmap_sg(host);
+			}
+		}
+	}
+	
+	wbsd_kunmap_sg(host);
+
+	/*
+	 * This is a very dirty hack to solve a
+	 * hardware problem. The chip doesn't trigger
+	 * FIFO threshold interrupts properly.
+	 */
+	if ((host->size - data->bytes_xfered) < 16)
+		tasklet_schedule(&host->fifo_tasklet);
+}
+
+static void wbsd_fill_fifo(struct wbsd_host* host)
+{
+	struct mmc_data* data = host->mrq->cmd->data;
+	char* buffer;
+	int i, fsr, fifo;
+	
+	/*
+	 * Check that we aren't being called after the
+	 * entire buffer has been transfered.
+	 */
+	if (data->bytes_xfered == host->size)
+		return;
+
+	buffer = wbsd_kmap_sg(host) + host->offset;
+
+	/*
+	 * Fill the fifo. This has a tendency to loop longer
+	 * than the FIFO length (usually one block).
+	 */
+	while (!((fsr = inb(host->base + WBSD_FSR)) & WBSD_FIFO_FULL))
+	{
+		/*
+		 * The size field in the FSR is broken so we have to
+		 * do some guessing.
+		 */		
+		if (fsr & WBSD_FIFO_EMPTY)
+			fifo = 0;
+		else if (fsr & WBSD_FIFO_EMTHRE)
+			fifo = 8;
+		else
+			fifo = 15;
+
+		for (i = 16;i > fifo;i--)
+		{
+			outb(*buffer, host->base + WBSD_DFR);
+			buffer++;
+			host->offset++;
+			host->remain--;
+			
+			data->bytes_xfered++;
+			
+			/*
+			 * Transfer done?
+			 */
+			if (data->bytes_xfered == host->size)
+			{
+				wbsd_kunmap_sg(host);
+				return;
+			}
+
+			/*
+			 * End of scatter list entry?
+			 */
+			if (host->remain == 0)
+			{
+				wbsd_kunmap_sg(host);
+				
+				/*
+				 * Get next entry. Check if last.
+				 */
+				if (!wbsd_next_sg(host))
+				{
+					/*
+					 * We should never reach this point.
+					 * It means that we're trying to
+					 * transfer more blocks than can fit
+					 * into the scatter list.
+					 */
+					BUG_ON(1);
+					
+					host->size = data->bytes_xfered;
+					
+					return;
+				}
+				
+				buffer = wbsd_kmap_sg(host);
+			}
+		}
+	}
+	
+	wbsd_kunmap_sg(host);
+}
+
+static void wbsd_prepare_data(struct wbsd_host* host, struct mmc_data* data)
+{
+	u16 blksize;
+	u8 setup;
+	unsigned long dmaflags;
+
+	DBGF("blksz %04x blks %04x flags %08x\n",
+		1 << data->blksz_bits, data->blocks, data->flags);
+	DBGF("tsac %d ms nsac %d clk\n",
+		data->timeout_ns / 1000000, data->timeout_clks);
+	
+	/*
+	 * Calculate size.
+	 */
+	host->size = data->blocks << data->blksz_bits;
+
+	/*
+	 * Check timeout values for overflow.
+	 * (Yes, some cards cause this value to overflow).
+	 */
+	if (data->timeout_ns > 127000000)
+		wbsd_write_index(host, WBSD_IDX_TAAC, 127);
+	else
+		wbsd_write_index(host, WBSD_IDX_TAAC, data->timeout_ns/1000000);
+	
+	if (data->timeout_clks > 255)
+		wbsd_write_index(host, WBSD_IDX_NSAC, 255);
+	else
+		wbsd_write_index(host, WBSD_IDX_NSAC, data->timeout_clks);
+	
+	/*
+	 * Inform the chip of how large blocks will be
+	 * sent. It needs this to determine when to
+	 * calculate CRC.
+	 *
+	 * Space for CRC must be included in the size.
+	 */
+	blksize = (1 << data->blksz_bits) + 2;
+	
+	wbsd_write_index(host, WBSD_IDX_PBSMSB, (blksize >> 4) & 0xF0);
+	wbsd_write_index(host, WBSD_IDX_PBSLSB, blksize & 0xFF);
+
+	/*
+	 * Clear the FIFO. This is needed even for DMA
+	 * transfers since the chip still uses the FIFO
+	 * internally.
+	 */
+	setup = wbsd_read_index(host, WBSD_IDX_SETUP);
+	setup |= WBSD_FIFO_RESET;
+	wbsd_write_index(host, WBSD_IDX_SETUP, setup);
+	
+	/*
+	 * DMA transfer?
+	 */
+	if (host->dma >= 0)
+	{	
+		/*
+		 * The buffer for DMA is only 64 kB.
+		 */
+		BUG_ON(host->size > 0x10000);
+		if (host->size > 0x10000)
+		{
+			data->error = MMC_ERR_INVALID;
+			return;
+		}
+		
+		/*
+		 * Transfer data from the SG list to
+		 * the DMA buffer.
+		 */
+		if (data->flags & MMC_DATA_WRITE)
+			wbsd_sg_to_dma(host, data);
+		
+		/*
+		 * Initialise the ISA DMA controller.
+		 */	
+		dmaflags = claim_dma_lock();
+		disable_dma(host->dma);
+		clear_dma_ff(host->dma);
+		if (data->flags & MMC_DATA_READ)
+			set_dma_mode(host->dma, DMA_MODE_READ & ~0x40);
+		else
+			set_dma_mode(host->dma, DMA_MODE_WRITE & ~0x40);
+		set_dma_addr(host->dma, host->dma_addr);
+		set_dma_count(host->dma, host->size);
+
+		enable_dma(host->dma);
+		release_dma_lock(dmaflags);
+
+		/*
+		 * Enable DMA on the host.
+		 */
+		wbsd_write_index(host, WBSD_IDX_DMA, WBSD_DMA_ENABLE);
+	}
+	else
+	{
+		/*
+		 * This flag is used to keep printk
+		 * output to a minimum.
+		 */
+		host->firsterr = 1;
+		
+		/*
+		 * Initialise the SG list.
+		 */
+		wbsd_init_sg(host, data);
+	
+		/*
+		 * Turn off DMA.
+		 */
+		wbsd_write_index(host, WBSD_IDX_DMA, 0);
+	
+		/*
+		 * Set up FIFO threshold levels (and fill
+		 * buffer if doing a write).
+		 */
+		if (data->flags & MMC_DATA_READ)
+		{
+			wbsd_write_index(host, WBSD_IDX_FIFOEN,
+				WBSD_FIFOEN_FULL | 8);
+		}
+		else
+		{
+			wbsd_write_index(host, WBSD_IDX_FIFOEN,
+				WBSD_FIFOEN_EMPTY | 8);
+			wbsd_fill_fifo(host);
+		}
+	}	
+		
+	data->error = MMC_ERR_NONE;
+}
+
+static void wbsd_finish_data(struct wbsd_host* host, struct mmc_data* data)
+{
+	unsigned long dmaflags;
+	int count;
+	u8 status;
+	
+	WARN_ON(host->mrq == NULL);
+
+	/*
+	 * Send a stop command if needed.
+	 */
+	if (data->stop)
+		wbsd_send_command(host, data->stop);
+
+	/*
+	 * Wait for the controller to leave data
+	 * transfer state.
+	 */
+	do
+	{
+		status = wbsd_read_index(host, WBSD_IDX_STATUS);
+	} while (status & (WBSD_BLOCK_READ | WBSD_BLOCK_WRITE));
+	
+	/*
+	 * DMA transfer?
+	 */
+	if (host->dma >= 0)
+	{
+		/*
+		 * Disable DMA on the host.
+		 */
+		wbsd_write_index(host, WBSD_IDX_DMA, 0);
+		
+		/*
+		 * Turn of ISA DMA controller.
+		 */
+		dmaflags = claim_dma_lock();
+		disable_dma(host->dma);
+		clear_dma_ff(host->dma);
+		count = get_dma_residue(host->dma);
+		release_dma_lock(dmaflags);
+		
+		/*
+		 * Any leftover data?
+		 */
+		if (count)
+		{
+			printk(KERN_ERR DRIVER_NAME ": Incomplete DMA "
+				"transfer. %d bytes left.\n", count);
+			
+			data->error = MMC_ERR_FAILED;
+		}
+		else
+		{
+			/*
+			 * Transfer data from DMA buffer to
+			 * SG list.
+			 */
+			if (data->flags & MMC_DATA_READ)
+				wbsd_dma_to_sg(host, data);
+			
+			data->bytes_xfered = host->size;
+		}
+	}
+	
+	DBGF("Ending data transfer (%d bytes)\n", data->bytes_xfered);
+	
+	wbsd_request_end(host, host->mrq);
+}
+
+/*
+ * MMC Callbacks
+ */
+
+static void wbsd_request(struct mmc_host* mmc, struct mmc_request* mrq)
+{
+	struct wbsd_host* host = mmc_priv(mmc);
+	struct mmc_command* cmd;
+
+	/*
+	 * Disable tasklets to avoid a deadlock.
+	 */
+	spin_lock_bh(&host->lock);
+
+	BUG_ON(host->mrq != NULL);
+
+	cmd = mrq->cmd;
+
+	host->mrq = mrq;
+	
+	/*
+	 * If there is no card in the slot then
+	 * timeout immediatly.
+	 */
+	if (!(inb(host->base + WBSD_CSR) & WBSD_CARDPRESENT))
+	{
+		cmd->error = MMC_ERR_TIMEOUT;
+		goto done;
+	}
+
+	/*
+	 * Does the request include data?
+	 */
+	if (cmd->data)
+	{
+		wbsd_prepare_data(host, cmd->data);
+		
+		if (cmd->data->error != MMC_ERR_NONE)
+			goto done;
+	}
+	
+	wbsd_send_command(host, cmd);
+
+	/*
+	 * If this is a data transfer the request
+	 * will be finished after the data has
+	 * transfered.
+	 */	
+	if (cmd->data && (cmd->error == MMC_ERR_NONE))
+	{
+		/*
+		 * Dirty fix for hardware bug.
+		 */
+		if (host->dma == -1)
+			tasklet_schedule(&host->fifo_tasklet);
+
+		spin_unlock_bh(&host->lock);
+
+		return;
+	}
+		
+done:
+	wbsd_request_end(host, mrq);
+
+	spin_unlock_bh(&host->lock);
+}
+
+static void wbsd_set_ios(struct mmc_host* mmc, struct mmc_ios* ios)
+{
+	struct wbsd_host* host = mmc_priv(mmc);
+	u8 clk, setup, pwr;
+	
+	DBGF("clock %uHz busmode %u powermode %u Vdd %u\n",
+		ios->clock, ios->bus_mode, ios->power_mode, ios->vdd);
+
+	spin_lock_bh(&host->lock);
+
+	/*
+	 * Reset the chip on each power off.
+	 * Should clear out any weird states.
+	 */
+	if (ios->power_mode == MMC_POWER_OFF)
+		wbsd_init_device(host);
+	
+	if (ios->clock >= 24000000)
+		clk = WBSD_CLK_24M;
+	else if (ios->clock >= 16000000)
+		clk = WBSD_CLK_16M;
+	else if (ios->clock >= 12000000)
+		clk = WBSD_CLK_12M;
+	else
+		clk = WBSD_CLK_375K;
+
+	/*
+	 * Only write to the clock register when
+	 * there is an actual change.
+	 */
+	if (clk != host->clk)
+	{
+		wbsd_write_index(host, WBSD_IDX_CLK, clk);
+		host->clk = clk;
+	}
+
+	if (ios->power_mode != MMC_POWER_OFF)
+	{
+		/*
+		 * Power up card.
+		 */
+		pwr = inb(host->base + WBSD_CSR);
+		pwr &= ~WBSD_POWER_N;
+		outb(pwr, host->base + WBSD_CSR);
+
+		/*
+		 * This behaviour is stolen from the
+		 * Windows driver. Don't know why, but
+		 * it is needed.
+		 */
+		setup = wbsd_read_index(host, WBSD_IDX_SETUP);
+		if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
+			setup |= WBSD_DAT3_H;
+		else
+			setup &= ~WBSD_DAT3_H;
+		wbsd_write_index(host, WBSD_IDX_SETUP, setup);
+
+		mdelay(1);
+	}
+
+	spin_unlock_bh(&host->lock);
+}
+
+/*
+ * Tasklets
+ */
+
+inline static struct mmc_data* wbsd_get_data(struct wbsd_host* host)
+{
+	WARN_ON(!host->mrq);
+	if (!host->mrq)
+		return NULL;
+
+	WARN_ON(!host->mrq->cmd);
+	if (!host->mrq->cmd)
+		return NULL;
+
+	WARN_ON(!host->mrq->cmd->data);
+	if (!host->mrq->cmd->data)
+		return NULL;
+	
+	return host->mrq->cmd->data;
+}
+
+static void wbsd_tasklet_card(unsigned long param)
+{
+	struct wbsd_host* host = (struct wbsd_host*)param;
+	u8 csr;
+	
+	spin_lock(&host->lock);
+	
+	csr = inb(host->base + WBSD_CSR);
+	WARN_ON(csr == 0xff);
+	
+	if (csr & WBSD_CARDPRESENT)
+		DBG("Card inserted\n");
+	else
+	{
+		DBG("Card removed\n");
+		
+		if (host->mrq)
+		{
+			printk(KERN_ERR DRIVER_NAME
+				": Card removed during transfer!\n");
+			wbsd_reset(host);
+			
+			host->mrq->cmd->error = MMC_ERR_FAILED;
+			tasklet_schedule(&host->finish_tasklet);
+		}
+	}
+	
+	/*
+	 * Unlock first since we might get a call back.
+	 */
+	spin_unlock(&host->lock);
+
+	mmc_detect_change(host->mmc);
+}
+
+static void wbsd_tasklet_fifo(unsigned long param)
+{
+	struct wbsd_host* host = (struct wbsd_host*)param;
+	struct mmc_data* data;
+	
+	spin_lock(&host->lock);
+		
+	if (!host->mrq)
+		goto end;
+	
+	data = wbsd_get_data(host);
+	if (!data)
+		goto end;
+
+	if (data->flags & MMC_DATA_WRITE)
+		wbsd_fill_fifo(host);
+	else
+		wbsd_empty_fifo(host);
+
+	/*
+	 * Done?
+	 */
+	if (host->size == data->bytes_xfered)
+	{
+		wbsd_write_index(host, WBSD_IDX_FIFOEN, 0);
+		tasklet_schedule(&host->finish_tasklet);
+	}
+
+end:	
+	spin_unlock(&host->lock);
+}
+
+static void wbsd_tasklet_crc(unsigned long param)
+{
+	struct wbsd_host* host = (struct wbsd_host*)param;
+	struct mmc_data* data;
+	
+	spin_lock(&host->lock);
+	
+	if (!host->mrq)
+		goto end;
+	
+	data = wbsd_get_data(host);
+	if (!data)
+		goto end;
+	
+	DBGF("CRC error\n");
+
+	data->error = MMC_ERR_BADCRC;
+	
+	tasklet_schedule(&host->finish_tasklet);
+
+end:		
+	spin_unlock(&host->lock);
+}
+
+static void wbsd_tasklet_timeout(unsigned long param)
+{
+	struct wbsd_host* host = (struct wbsd_host*)param;
+	struct mmc_data* data;
+	
+	spin_lock(&host->lock);
+	
+	if (!host->mrq)
+		goto end;
+	
+	data = wbsd_get_data(host);
+	if (!data)
+		goto end;
+	
+	DBGF("Timeout\n");
+
+	data->error = MMC_ERR_TIMEOUT;
+	
+	tasklet_schedule(&host->finish_tasklet);
+
+end:	
+	spin_unlock(&host->lock);
+}
+
+static void wbsd_tasklet_finish(unsigned long param)
+{
+	struct wbsd_host* host = (struct wbsd_host*)param;
+	struct mmc_data* data;
+	
+	spin_lock(&host->lock);
+	
+	WARN_ON(!host->mrq);
+	if (!host->mrq)
+		goto end;
+	
+	data = wbsd_get_data(host);
+	if (!data)
+		goto end;
+
+	wbsd_finish_data(host, data);
+	
+end:	
+	spin_unlock(&host->lock);
+}
+
+static void wbsd_tasklet_block(unsigned long param)
+{
+	struct wbsd_host* host = (struct wbsd_host*)param;
+	struct mmc_data* data;
+	
+	spin_lock(&host->lock);
+
+	if ((wbsd_read_index(host, WBSD_IDX_CRCSTATUS) & WBSD_CRC_MASK) !=
+		WBSD_CRC_OK)
+	{
+		data = wbsd_get_data(host);
+		if (!data)
+			goto end;
+		
+		DBGF("CRC error\n");
+
+		data->error = MMC_ERR_BADCRC;
+	
+		tasklet_schedule(&host->finish_tasklet);
+	}
+
+end:	
+	spin_unlock(&host->lock);
+}
+
+/*
+ * Interrupt handling
+ */
+
+static irqreturn_t wbsd_irq(int irq, void *dev_id, struct pt_regs *regs)
+{
+	struct wbsd_host* host = dev_id;
+	int isr;
+	
+	isr = inb(host->base + WBSD_ISR);
+
+	/*
+	 * Was it actually our hardware that caused the interrupt?
+	 */
+	if (isr == 0xff || isr == 0x00)
+		return IRQ_NONE;
+	
+	host->isr |= isr;
+
+	/*
+	 * Schedule tasklets as needed.
+	 */
+	if (isr & WBSD_INT_CARD)
+		tasklet_schedule(&host->card_tasklet);
+	if (isr & WBSD_INT_FIFO_THRE)
+		tasklet_schedule(&host->fifo_tasklet);
+	if (isr & WBSD_INT_CRC)
+		tasklet_hi_schedule(&host->crc_tasklet);
+	if (isr & WBSD_INT_TIMEOUT)
+		tasklet_hi_schedule(&host->timeout_tasklet);
+	if (isr & WBSD_INT_BUSYEND)
+		tasklet_hi_schedule(&host->block_tasklet);
+	if (isr & WBSD_INT_TC)
+		tasklet_schedule(&host->finish_tasklet);
+	
+	return IRQ_HANDLED;
+}
+
+/*
+ * Support functions for probe
+ */
+
+static int wbsd_scan(struct wbsd_host* host)
+{
+	int i, j, k;
+	int id;
+	
+	/*
+	 * Iterate through all ports, all codes to
+	 * find hardware that is in our known list.
+	 */
+	for (i = 0;i < sizeof(config_ports)/sizeof(int);i++)
+	{
+		if (!request_region(config_ports[i], 2, DRIVER_NAME))
+			continue;
+			
+		for (j = 0;j < sizeof(unlock_codes)/sizeof(int);j++)
+		{
+			id = 0xFFFF;
+			
+			outb(unlock_codes[j], config_ports[i]);
+			outb(unlock_codes[j], config_ports[i]);
+			
+			outb(WBSD_CONF_ID_HI, config_ports[i]);
+			id = inb(config_ports[i] + 1) << 8;
+
+			outb(WBSD_CONF_ID_LO, config_ports[i]);
+			id |= inb(config_ports[i] + 1);
+			
+			for (k = 0;k < sizeof(valid_ids)/sizeof(int);k++)
+			{
+				if (id == valid_ids[k])
+				{				
+					host->chip_id = id;
+					host->config = config_ports[i];
+					host->unlock_code = unlock_codes[i];
+				
+					return 0;
+				}
+			}
+			
+			if (id != 0xFFFF)
+			{
+				DBG("Unknown hardware (id %x) found at %x\n",
+					id, config_ports[i]);
+			}
+
+			outb(LOCK_CODE, config_ports[i]);
+		}
+		
+		release_region(config_ports[i], 2);
+	}
+	
+	return -ENODEV;
+}
+
+static int wbsd_request_regions(struct wbsd_host* host)
+{
+	if (io & 0x7)
+		return -EINVAL;
+	
+	if (!request_region(io, 8, DRIVER_NAME))
+		return -EIO;
+	
+	host->base = io;
+		
+	return 0;
+}
+
+static void wbsd_release_regions(struct wbsd_host* host)
+{
+	if (host->base)
+		release_region(host->base, 8);
+
+	if (host->config)
+		release_region(host->config, 2);
+}
+
+static void wbsd_init_dma(struct wbsd_host* host)
+{
+	host->dma = -1;
+	
+	if (dma < 0)
+		return;
+	
+	if (request_dma(dma, DRIVER_NAME))
+		goto err;
+	
+	/*
+	 * We need to allocate a special buffer in
+	 * order for ISA to be able to DMA to it.
+	 */
+	host->dma_buffer = kmalloc(65536,
+		GFP_NOIO | GFP_DMA | __GFP_REPEAT | __GFP_NOWARN);
+	if (!host->dma_buffer)
+		goto free;
+
+	/*
+	 * Translate the address to a physical address.
+	 */
+	host->dma_addr = isa_virt_to_bus(host->dma_buffer);
+			
+	/*
+	 * ISA DMA must be aligned on a 64k basis.
+	 */
+	if ((host->dma_addr & 0xffff) != 0)
+		goto kfree;
+	/*
+	 * ISA cannot access memory above 16 MB.
+	 */
+	else if (host->dma_addr >= 0x1000000)
+		goto kfree;
+
+	host->dma = dma;
+	
+	return;
+	
+kfree:
+	/*
+	 * If we've gotten here then there is some kind of alignment bug
+	 */
+	BUG_ON(1);
+	
+	kfree(host->dma_buffer);
+	host->dma_buffer = NULL;
+
+free:
+	free_dma(dma);
+
+err:
+	printk(KERN_WARNING DRIVER_NAME ": Unable to allocate DMA %d. "
+		"Falling back on FIFO.\n", dma);
+}
+
+static struct mmc_host_ops wbsd_ops = {
+	.request	= wbsd_request,
+	.set_ios	= wbsd_set_ios,
+};
+
+/*
+ * Device probe
+ */
+
+static int wbsd_probe(struct device* dev)
+{
+	struct wbsd_host* host = NULL;
+	struct mmc_host* mmc = NULL;
+	int ret;
+	
+	/*
+	 * Allocate MMC structure.
+	 */
+	mmc = mmc_alloc_host(sizeof(struct wbsd_host), dev);
+	if (!mmc)
+		return -ENOMEM;
+	
+	host = mmc_priv(mmc);
+	host->mmc = mmc;
+	
+	/*
+	 * Scan for hardware.
+	 */
+	ret = wbsd_scan(host);
+	if (ret)
+		goto freemmc;
+
+	/*
+	 * Reset the chip.
+	 */	
+	wbsd_write_config(host, WBSD_CONF_SWRST, 1);
+	wbsd_write_config(host, WBSD_CONF_SWRST, 0);
+
+	/*
+	 * Allocate I/O ports.
+	 */
+	ret = wbsd_request_regions(host);
+	if (ret)
+		goto release;
+
+	/*
+	 * Set host parameters.
+	 */
+	mmc->ops = &wbsd_ops;
+	mmc->f_min = 375000;
+	mmc->f_max = 24000000;
+	mmc->ocr_avail = MMC_VDD_32_33|MMC_VDD_33_34;
+	
+	spin_lock_init(&host->lock);
+
+	/*
+	 * Select SD/MMC function.
+	 */
+	wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
+	
+	/*
+	 * Set up card detection.
+	 */
+	wbsd_write_config(host, WBSD_CONF_PINS, 0x02);
+	
+	/*
+	 * Configure I/O port.
+	 */
+	wbsd_write_config(host, WBSD_CONF_PORT_HI, host->base >> 8);
+	wbsd_write_config(host, WBSD_CONF_PORT_LO, host->base & 0xff);
+
+	/*
+	 * Allocate interrupt.
+	 */
+	ret = request_irq(irq, wbsd_irq, SA_SHIRQ, DRIVER_NAME, host);
+	if (ret)
+		goto release;
+	
+	host->irq = irq;
+	
+	/*
+	 * Set up tasklets.
+	 */
+	tasklet_init(&host->card_tasklet, wbsd_tasklet_card, (unsigned long)host);
+	tasklet_init(&host->fifo_tasklet, wbsd_tasklet_fifo, (unsigned long)host);
+	tasklet_init(&host->crc_tasklet, wbsd_tasklet_crc, (unsigned long)host);
+	tasklet_init(&host->timeout_tasklet, wbsd_tasklet_timeout, (unsigned long)host);
+	tasklet_init(&host->finish_tasklet, wbsd_tasklet_finish, (unsigned long)host);
+	tasklet_init(&host->block_tasklet, wbsd_tasklet_block, (unsigned long)host);
+	
+	/*
+	 * Configure interrupt.
+	 */
+	wbsd_write_config(host, WBSD_CONF_IRQ, host->irq);
+	
+	/*
+	 * Allocate DMA.
+	 */
+	wbsd_init_dma(host);
+	
+	/*
+	 * If all went well, then configure DMA.
+	 */
+	if (host->dma >= 0)
+		wbsd_write_config(host, WBSD_CONF_DRQ, host->dma);
+	
+	/*
+	 * Maximum number of segments. Worst case is one sector per segment
+	 * so this will be 64kB/512.
+	 */
+	mmc->max_hw_segs = 128;
+	mmc->max_phys_segs = 128;
+	
+	/*
+	 * Maximum number of sectors in one transfer. Also limited by 64kB
+	 * buffer.
+	 */
+	mmc->max_sectors = 128;
+	
+	/*
+	 * Maximum segment size. Could be one segment with the maximum number
+	 * of segments.
+	 */
+	mmc->max_seg_size = mmc->max_sectors * 512;
+	
+	/*
+	 * Enable chip.
+	 */
+	wbsd_write_config(host, WBSD_CONF_ENABLE, 1);
+	
+	/*
+	 * Power up chip.
+	 */
+	wbsd_write_config(host, WBSD_CONF_POWER, 0x20);
+	
+	/*
+	 * Power Management stuff. No idea how this works.
+	 * Not tested.
+	 */
+#ifdef CONFIG_PM
+	wbsd_write_config(host, WBSD_CONF_PME, 0xA0);
+#endif
+
+	/*
+	 * Reset the chip into a known state.
+	 */
+	wbsd_init_device(host);
+	
+	dev_set_drvdata(dev, mmc);
+	
+	/*
+	 * Add host to MMC layer.
+	 */
+	mmc_add_host(mmc);
+
+	printk(KERN_INFO "%s: W83L51xD id %x at 0x%x irq %d dma %d\n",
+		mmc->host_name, (int)host->chip_id, (int)host->base,
+		(int)host->irq, (int)host->dma);
+
+	return 0;
+
+release:
+	wbsd_release_regions(host);
+
+freemmc:
+	mmc_free_host(mmc);
+
+	return ret;
+}
+
+/*
+ * Device remove
+ */
+
+static int wbsd_remove(struct device* dev)
+{
+	struct mmc_host* mmc = dev_get_drvdata(dev);
+	struct wbsd_host* host;
+	
+	if (!mmc)
+		return 0;
+
+	host = mmc_priv(mmc);
+	
+	/*
+	 * Unregister host with MMC layer.
+	 */
+	mmc_remove_host(mmc);
+
+	/*
+	 * Power down the SD/MMC function.
+	 */
+	wbsd_unlock_config(host);
+	wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
+	wbsd_write_config(host, WBSD_CONF_ENABLE, 0);
+	wbsd_lock_config(host);
+	
+	/*
+	 * Free resources.
+	 */
+	if (host->dma_buffer)
+		kfree(host->dma_buffer);
+	
+	if (host->dma >= 0)
+		free_dma(host->dma);
+
+	free_irq(host->irq, host);
+	
+	tasklet_kill(&host->card_tasklet);
+	tasklet_kill(&host->fifo_tasklet);
+	tasklet_kill(&host->crc_tasklet);
+	tasklet_kill(&host->timeout_tasklet);
+	tasklet_kill(&host->finish_tasklet);
+	tasklet_kill(&host->block_tasklet);
+	
+	wbsd_release_regions(host);
+	
+	mmc_free_host(mmc);
+
+	return 0;
+}
+
+/*
+ * Power management
+ */
+
+#ifdef CONFIG_PM
+static int wbsd_suspend(struct device *dev, u32 state, u32 level)
+{
+	DBGF("Not yet supported\n");
+
+	return 0;
+}
+
+static int wbsd_resume(struct device *dev, u32 level)
+{
+	DBGF("Not yet supported\n");
+
+	return 0;
+}
+#else
+#define wbsd_suspend NULL
+#define wbsd_resume NULL
+#endif
+
+static void wbsd_release(struct device *dev)
+{
+}
+
+static struct platform_device wbsd_device = {
+	.name		= DRIVER_NAME,
+	.id			= -1,
+	.dev		= {
+		.release = wbsd_release,
+	},
+};
+
+static struct device_driver wbsd_driver = {
+	.name		= DRIVER_NAME,
+	.bus		= &platform_bus_type,
+	.probe		= wbsd_probe,
+	.remove		= wbsd_remove,
+	
+	.suspend	= wbsd_suspend,
+	.resume		= wbsd_resume,
+};
+
+/*
+ * Module loading/unloading
+ */
+
+static int __init wbsd_drv_init(void)
+{
+	int result;
+	
+	printk(KERN_INFO DRIVER_NAME
+		": Winbond W83L51xD SD/MMC card interface driver, "
+		DRIVER_VERSION "\n");
+	printk(KERN_INFO DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
+	
+	result = driver_register(&wbsd_driver);
+	if (result < 0)
+		return result;
+
+	result = platform_device_register(&wbsd_device);
+	if (result < 0)
+		return result;
+
+	return 0;
+}
+
+static void __exit wbsd_drv_exit(void)
+{
+	platform_device_unregister(&wbsd_device);
+	
+	driver_unregister(&wbsd_driver);
+
+	DBG("unloaded\n");
+}
+
+module_init(wbsd_drv_init);
+module_exit(wbsd_drv_exit);
+module_param(io, uint, 0444);
+module_param(irq, uint, 0444);
+module_param(dma, int, 0444);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Winbond W83L51xD SD/MMC card interface driver");
+MODULE_VERSION(DRIVER_VERSION);
+
+MODULE_PARM_DESC(io, "I/O base to allocate. Must be 8 byte aligned. (default 0x248)");
+MODULE_PARM_DESC(irq, "IRQ to allocate. (default 6)");
+MODULE_PARM_DESC(dma, "DMA channel to allocate. -1 for no DMA. (default 2)");