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Commit 9181ece3 authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Ulf Hansson
Browse files

mmc: wbsd: handle highmem pages 



Use sg_copy_{from,to}_buffer to bounce buffer and kmap_atomic to map the
scatterlist entry before using it.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent a4034173

drivers/mmc/host/wbsd.c

+30 −38
Original line number Diff line number Diff line
@@ -268,43 +268,29 @@ static inline int wbsd_next_sg(struct wbsd_host *host) 
	return host->num_sg;

}



static inline char *wbsd_sg_to_buffer(struct wbsd_host *host)

static inline char *wbsd_map_sg(struct wbsd_host *host)

{

	return sg_virt(host->cur_sg);

	return kmap_atomic(sg_page(host->cur_sg)) + host->cur_sg->offset;

}



static inline void wbsd_sg_to_dma(struct wbsd_host *host, struct mmc_data *data)

{

	unsigned int len, i;

	struct scatterlist *sg;

	char *dmabuf = host->dma_buffer;

	char *sgbuf;



	sg = data->sg;

	len = data->sg_len;

	size_t len = 0;

	int i;



	for (i = 0; i < len; i++) {

		sgbuf = sg_virt(&sg[i]);

		memcpy(dmabuf, sgbuf, sg[i].length);

		dmabuf += sg[i].length;

	}

	for (i = 0; i < data->sg_len; i++)

		len += data->sg[i].length;

	sg_copy_to_buffer(data->sg, data->sg_len, host->dma_buffer, len);

}



static inline void wbsd_dma_to_sg(struct wbsd_host *host, struct mmc_data *data)

{

	unsigned int len, i;

	struct scatterlist *sg;

	char *dmabuf = host->dma_buffer;

	char *sgbuf;



	sg = data->sg;

	len = data->sg_len;

	size_t len = 0;

	int i;



	for (i = 0; i < len; i++) {

		sgbuf = sg_virt(&sg[i]);

		memcpy(sgbuf, dmabuf, sg[i].length);

		dmabuf += sg[i].length;

	}

	for (i = 0; i < data->sg_len; i++)

		len += data->sg[i].length;

	sg_copy_from_buffer(data->sg, data->sg_len, host->dma_buffer, len);

}



/*
@@ -418,7 +404,7 @@ static void wbsd_empty_fifo(struct wbsd_host *host) 
{

	struct mmc_data *data = host->mrq->cmd->data;

	char *buffer;

	int i, fsr, fifo;

	int i, idx, fsr, fifo;



	/*

	 * Handle excessive data.
@@ -426,7 +412,8 @@ static void wbsd_empty_fifo(struct wbsd_host *host) 
	if (host->num_sg == 0)

		return;



	buffer = wbsd_sg_to_buffer(host) + host->offset;

	buffer = wbsd_map_sg(host) + host->offset;

	idx = 0;



	/*

	 * Drain the fifo. This has a tendency to loop longer
@@ -445,8 +432,7 @@ static void wbsd_empty_fifo(struct wbsd_host *host) 
			fifo = 1;



		for (i = 0; i < fifo; i++) {

			*buffer = inb(host->base + WBSD_DFR);

			buffer++;

			buffer[idx++] = inb(host->base + WBSD_DFR);

			host->offset++;

			host->remain--;
@@ -456,16 +442,19 @@ static void wbsd_empty_fifo(struct wbsd_host *host) 
			 * End of scatter list entry?

			 */

			if (host->remain == 0) {

				kunmap_atomic(buffer);

				/*

				 * Get next entry. Check if last.

				 */

				if (!wbsd_next_sg(host))

					return;



				buffer = wbsd_sg_to_buffer(host);

				buffer = wbsd_map_sg(host);

				idx = 0;

			}

		}

	}

	kunmap_atomic(buffer);



	/*

	 * This is a very dirty hack to solve a
@@ -480,7 +469,7 @@ static void wbsd_fill_fifo(struct wbsd_host *host) 
{

	struct mmc_data *data = host->mrq->cmd->data;

	char *buffer;

	int i, fsr, fifo;

	int i, idx, fsr, fifo;



	/*

	 * Check that we aren't being called after the
@@ -489,7 +478,8 @@ static void wbsd_fill_fifo(struct wbsd_host *host) 
	if (host->num_sg == 0)

		return;



	buffer = wbsd_sg_to_buffer(host) + host->offset;

	buffer = wbsd_map_sg(host) + host->offset;

	idx = 0;



	/*

	 * Fill the fifo. This has a tendency to loop longer
@@ -508,8 +498,7 @@ static void wbsd_fill_fifo(struct wbsd_host *host) 
			fifo = 15;



		for (i = 16; i > fifo; i--) {

			outb(*buffer, host->base + WBSD_DFR);

			buffer++;

			outb(buffer[idx], host->base + WBSD_DFR);

			host->offset++;

			host->remain--;
@@ -519,16 +508,19 @@ static void wbsd_fill_fifo(struct wbsd_host *host) 
			 * End of scatter list entry?

			 */

			if (host->remain == 0) {

				kunmap_atomic(buffer);

				/*

				 * Get next entry. Check if last.

				 */

				if (!wbsd_next_sg(host))

					return;



				buffer = wbsd_sg_to_buffer(host);

				buffer = wbsd_map_sg(host);

				idx = 0;

			}

		}

	}

	kunmap_atomic(buffer);



	/*

	 * The controller stops sending interrupts for