1 files changed, 306 insertions, 0 deletions
diff --git a/drivers/staging/media/solo6x10/p2m.c b/drivers/staging/media/solo6x10/p2m.c
new file mode 100644
index 000000000000..56210f0fc5ec
--- /dev/null
+++ b/drivers/staging/media/solo6x10/p2m.c
@@ -0,0 +1,306 @@
+/*
+ * Copyright (C) 2010 Bluecherry, LLC www.bluecherrydvr.com
+ * Copyright (C) 2010 Ben Collins <bcollins@bluecherry.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/scatterlist.h>
+#include "solo6x10.h"
+
+/* #define SOLO_TEST_P2M */
+
+int solo_p2m_dma(struct solo_dev *solo_dev, u8 id, int wr,
+		 void *sys_addr, u32 ext_addr, u32 size)
+{
+	dma_addr_t dma_addr;
+	int ret;
+
+	WARN_ON(!size);
+	BUG_ON(id >= SOLO_NR_P2M);
+
+	if (!size)
+		return -EINVAL;
+
+	dma_addr = pci_map_single(solo_dev->pdev, sys_addr, size,
+				  wr ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
+
+	ret = solo_p2m_dma_t(solo_dev, id, wr, dma_addr, ext_addr, size);
+
+	pci_unmap_single(solo_dev->pdev, dma_addr, size,
+			 wr ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
+
+	return ret;
+}
+
+int solo_p2m_dma_t(struct solo_dev *solo_dev, u8 id, int wr,
+		   dma_addr_t dma_addr, u32 ext_addr, u32 size)
+{
+	struct p2m_desc *desc = kzalloc(sizeof(*desc) * 2, GFP_DMA);
+	int ret;
+
+	if (desc == NULL)
+		return -ENOMEM;
+
+	solo_p2m_push_desc(&desc[1], wr, dma_addr, ext_addr, size, 0, 0);
+	ret = solo_p2m_dma_desc(solo_dev, id, desc, 2);
+	kfree(desc);
+
+	return ret;
+}
+
+void solo_p2m_push_desc(struct p2m_desc *desc, int wr, dma_addr_t dma_addr,
+			u32 ext_addr, u32 size, int repeat, u32 ext_size)
+{
+	desc->ta = cpu_to_le32(dma_addr);
+	desc->fa = cpu_to_le32(ext_addr);
+
+	desc->ext = cpu_to_le32(SOLO_P2M_COPY_SIZE(size >> 2));
+	desc->ctrl = cpu_to_le32(SOLO_P2M_BURST_SIZE(SOLO_P2M_BURST_256) |
+				 (wr ? SOLO_P2M_WRITE : 0) | SOLO_P2M_TRANS_ON);
+
+	/* Ext size only matters when we're repeating */
+	if (repeat) {
+		desc->ext |= cpu_to_le32(SOLO_P2M_EXT_INC(ext_size >> 2));
+		desc->ctrl |=  cpu_to_le32(SOLO_P2M_PCI_INC(size >> 2) |
+					   SOLO_P2M_REPEAT(repeat));
+	}
+}
+
+int solo_p2m_dma_desc(struct solo_dev *solo_dev, u8 id,
+		      struct p2m_desc *desc, int desc_count)
+{
+	struct solo_p2m_dev *p2m_dev;
+	unsigned int timeout;
+	int ret = 0;
+	u32 config = 0;
+	dma_addr_t desc_dma = 0;
+
+	BUG_ON(id >= SOLO_NR_P2M);
+	BUG_ON(!desc_count || desc_count > SOLO_NR_P2M_DESC);
+
+	p2m_dev = &solo_dev->p2m_dev[id];
+
+	mutex_lock(&p2m_dev->mutex);
+
+	solo_reg_write(solo_dev, SOLO_P2M_CONTROL(id), 0);
+
+	INIT_COMPLETION(p2m_dev->completion);
+	p2m_dev->error = 0;
+
+	/* Enable the descriptors */
+	config = solo_reg_read(solo_dev, SOLO_P2M_CONFIG(id));
+	desc_dma = pci_map_single(solo_dev->pdev, desc,
+				  desc_count * sizeof(*desc),
+				  PCI_DMA_TODEVICE);
+	solo_reg_write(solo_dev, SOLO_P2M_DES_ADR(id), desc_dma);
+	solo_reg_write(solo_dev, SOLO_P2M_DESC_ID(id), desc_count - 1);
+	solo_reg_write(solo_dev, SOLO_P2M_CONFIG(id), config |
+		       SOLO_P2M_DESC_MODE);
+
+	/* Should have all descriptors completed from one interrupt */
+	timeout = wait_for_completion_timeout(&p2m_dev->completion, HZ);
+
+	solo_reg_write(solo_dev, SOLO_P2M_CONTROL(id), 0);
+
+	/* Reset back to non-descriptor mode */
+	solo_reg_write(solo_dev, SOLO_P2M_CONFIG(id), config);
+	solo_reg_write(solo_dev, SOLO_P2M_DESC_ID(id), 0);
+	solo_reg_write(solo_dev, SOLO_P2M_DES_ADR(id), 0);
+	pci_unmap_single(solo_dev->pdev, desc_dma,
+			 desc_count * sizeof(*desc),
+			 PCI_DMA_TODEVICE);
+
+	if (p2m_dev->error)
+		ret = -EIO;
+	else if (timeout == 0)
+		ret = -EAGAIN;
+
+	mutex_unlock(&p2m_dev->mutex);
+
+	WARN_ON_ONCE(ret);
+
+	return ret;
+}
+
+int solo_p2m_dma_sg(struct solo_dev *solo_dev, u8 id,
+		    struct p2m_desc *pdesc, int wr,
+		    struct scatterlist *sg, u32 sg_off,
+		    u32 ext_addr, u32 size)
+{
+	int i;
+	int idx;
+
+	BUG_ON(id >= SOLO_NR_P2M);
+
+	if (WARN_ON_ONCE(!size))
+		return -EINVAL;
+
+	memset(pdesc, 0, sizeof(*pdesc));
+
+	/* Should rewrite this to handle > SOLO_NR_P2M_DESC transactions */
+	for (i = 0, idx = 1; idx < SOLO_NR_P2M_DESC && sg && size > 0;
+	     i++, sg = sg_next(sg)) {
+		struct p2m_desc *desc = &pdesc[idx];
+		u32 sg_len = sg_dma_len(sg);
+		u32 len;
+
+		if (sg_off >= sg_len) {
+			sg_off -= sg_len;
+			continue;
+		}
+
+		sg_len -= sg_off;
+		len = min(sg_len, size);
+
+		solo_p2m_push_desc(desc, wr, sg_dma_address(sg) + sg_off,
+				   ext_addr, len, 0, 0);
+
+		size -= len;
+		ext_addr += len;
+		idx++;
+
+		sg_off = 0;
+	}
+
+	WARN_ON_ONCE(size || i >= SOLO_NR_P2M_DESC);
+
+	return solo_p2m_dma_desc(solo_dev, id, pdesc, idx);
+}
+
+#ifdef SOLO_TEST_P2M
+
+#define P2M_TEST_CHAR		0xbe
+
+static unsigned long long p2m_test(struct solo_dev *solo_dev, u8 id,
+				   u32 base, int size)
+{
+	u8 *wr_buf;
+	u8 *rd_buf;
+	int i;
+	unsigned long long err_cnt = 0;
+
+	wr_buf = kmalloc(size, GFP_KERNEL);
+	if (!wr_buf) {
+		printk(SOLO6X10_NAME ": Failed to malloc for p2m_test\n");
+		return size;
+	}
+
+	rd_buf = kmalloc(size, GFP_KERNEL);
+	if (!rd_buf) {
+		printk(SOLO6X10_NAME ": Failed to malloc for p2m_test\n");
+		kfree(wr_buf);
+		return size;
+	}
+
+	memset(wr_buf, P2M_TEST_CHAR, size);
+	memset(rd_buf, P2M_TEST_CHAR + 1, size);
+
+	solo_p2m_dma(solo_dev, id, 1, wr_buf, base, size);
+	solo_p2m_dma(solo_dev, id, 0, rd_buf, base, size);
+
+	for (i = 0; i < size; i++)
+		if (wr_buf[i] != rd_buf[i])
+			err_cnt++;
+
+	kfree(wr_buf);
+	kfree(rd_buf);
+
+	return err_cnt;
+}
+
+#define TEST_CHUNK_SIZE		(8 * 1024)
+
+static void run_p2m_test(struct solo_dev *solo_dev)
+{
+	unsigned long long errs = 0;
+	u32 size = SOLO_JPEG_EXT_ADDR(solo_dev) + SOLO_JPEG_EXT_SIZE(solo_dev);
+	int i, d;
+
+	printk(KERN_WARNING "%s: Testing %u bytes of external ram\n",
+	       SOLO6X10_NAME, size);
+
+	for (i = 0; i < size; i += TEST_CHUNK_SIZE)
+		for (d = 0; d < 4; d++)
+			errs += p2m_test(solo_dev, d, i, TEST_CHUNK_SIZE);
+
+	printk(KERN_WARNING "%s: Found %llu errors during p2m test\n",
+	       SOLO6X10_NAME, errs);
+
+	return;
+}
+#else
+#define run_p2m_test(__solo)	do {} while (0)
+#endif
+
+void solo_p2m_isr(struct solo_dev *solo_dev, int id)
+{
+	struct solo_p2m_dev *p2m_dev = &solo_dev->p2m_dev[id];
+
+	solo_reg_write(solo_dev, SOLO_IRQ_STAT, SOLO_IRQ_P2M(id));
+
+	complete(&p2m_dev->completion);
+}
+
+void solo_p2m_error_isr(struct solo_dev *solo_dev, u32 status)
+{
+	struct solo_p2m_dev *p2m_dev;
+	int i;
+
+	if (!(status & SOLO_PCI_ERR_P2M))
+		return;
+
+	for (i = 0; i < SOLO_NR_P2M; i++) {
+		p2m_dev = &solo_dev->p2m_dev[i];
+		p2m_dev->error = 1;
+		solo_reg_write(solo_dev, SOLO_P2M_CONTROL(i), 0);
+		complete(&p2m_dev->completion);
+	}
+}
+
+void solo_p2m_exit(struct solo_dev *solo_dev)
+{
+	int i;
+
+	for (i = 0; i < SOLO_NR_P2M; i++)
+		solo_irq_off(solo_dev, SOLO_IRQ_P2M(i));
+}
+
+int solo_p2m_init(struct solo_dev *solo_dev)
+{
+	struct solo_p2m_dev *p2m_dev;
+	int i;
+
+	for (i = 0; i < SOLO_NR_P2M; i++) {
+		p2m_dev = &solo_dev->p2m_dev[i];
+
+		mutex_init(&p2m_dev->mutex);
+		init_completion(&p2m_dev->completion);
+
+		solo_reg_write(solo_dev, SOLO_P2M_CONTROL(i), 0);
+		solo_reg_write(solo_dev, SOLO_P2M_CONFIG(i),
+			       SOLO_P2M_CSC_16BIT_565 |
+			       SOLO_P2M_DMA_INTERVAL(3) |
+			       SOLO_P2M_DESC_INTR_OPT |
+			       SOLO_P2M_PCI_MASTER_MODE);
+		solo_irq_on(solo_dev, SOLO_IRQ_P2M(i));
+	}
+
+	run_p2m_test(solo_dev);
+
+	return 0;
+}