1 files changed, 256 insertions, 0 deletions
diff --git a/drivers/media/dvb/mantis/mantis_dma.c b/drivers/media/dvb/mantis/mantis_dma.c
new file mode 100644
index 000000000000..46202a4012aa
--- /dev/null
+++ b/drivers/media/dvb/mantis/mantis_dma.c
@@ -0,0 +1,256 @@
+/*
+	Mantis PCI bridge driver
+
+	Copyright (C) Manu Abraham (abraham.manu@gmail.com)
+
+	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., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include <linux/kernel.h>
+#include <asm/page.h>
+#include <linux/vmalloc.h>
+#include <linux/pci.h>
+
+#include <asm/irq.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/interrupt.h>
+
+#include "dmxdev.h"
+#include "dvbdev.h"
+#include "dvb_demux.h"
+#include "dvb_frontend.h"
+#include "dvb_net.h"
+
+#include "mantis_common.h"
+#include "mantis_reg.h"
+#include "mantis_dma.h"
+
+#define RISC_WRITE		(0x01 << 28)
+#define RISC_JUMP		(0x07 << 28)
+#define RISC_IRQ		(0x01 << 24)
+
+#define RISC_STATUS(status)	((((~status) & 0x0f) << 20) | ((status & 0x0f) << 16))
+#define RISC_FLUSH()		(mantis->risc_pos = 0)
+#define RISC_INSTR(opcode)	(mantis->risc_cpu[mantis->risc_pos++] = cpu_to_le32(opcode))
+
+#define MANTIS_BUF_SIZE		(64 * 1024)
+#define MANTIS_BLOCK_BYTES	(MANTIS_BUF_SIZE >> 4)
+#define MANTIS_BLOCK_COUNT	(1 << 4)
+#define MANTIS_RISC_SIZE	PAGE_SIZE
+
+int mantis_dma_exit(struct mantis_pci *mantis)
+{
+	if (mantis->buf_cpu) {
+		dprintk(MANTIS_ERROR, 1,
+			"DMA=0x%lx cpu=0x%p size=%d",
+			(unsigned long) mantis->buf_dma,
+			 mantis->buf_cpu,
+			 MANTIS_BUF_SIZE);
+
+		pci_free_consistent(mantis->pdev, MANTIS_BUF_SIZE,
+				    mantis->buf_cpu, mantis->buf_dma);
+
+		mantis->buf_cpu = NULL;
+	}
+	if (mantis->risc_cpu) {
+		dprintk(MANTIS_ERROR, 1,
+			"RISC=0x%lx cpu=0x%p size=%lx",
+			(unsigned long) mantis->risc_dma,
+			mantis->risc_cpu,
+			MANTIS_RISC_SIZE);
+
+		pci_free_consistent(mantis->pdev, MANTIS_RISC_SIZE,
+				    mantis->risc_cpu, mantis->risc_dma);
+
+		mantis->risc_cpu = NULL;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(mantis_dma_exit);
+
+static inline int mantis_alloc_buffers(struct mantis_pci *mantis)
+{
+	if (!mantis->buf_cpu) {
+		mantis->buf_cpu = pci_alloc_consistent(mantis->pdev,
+						       MANTIS_BUF_SIZE,
+						       &mantis->buf_dma);
+		if (!mantis->buf_cpu) {
+			dprintk(MANTIS_ERROR, 1,
+				"DMA buffer allocation failed");
+
+			goto err;
+		}
+		dprintk(MANTIS_ERROR, 1,
+			"DMA=0x%lx cpu=0x%p size=%d",
+			(unsigned long) mantis->buf_dma,
+			mantis->buf_cpu, MANTIS_BUF_SIZE);
+	}
+	if (!mantis->risc_cpu) {
+		mantis->risc_cpu = pci_alloc_consistent(mantis->pdev,
+							MANTIS_RISC_SIZE,
+							&mantis->risc_dma);
+
+		if (!mantis->risc_cpu) {
+			dprintk(MANTIS_ERROR, 1,
+				"RISC program allocation failed");
+
+			mantis_dma_exit(mantis);
+
+			goto err;
+		}
+		dprintk(MANTIS_ERROR, 1,
+			"RISC=0x%lx cpu=0x%p size=%lx",
+			(unsigned long) mantis->risc_dma,
+			mantis->risc_cpu, MANTIS_RISC_SIZE);
+	}
+
+	return 0;
+err:
+	dprintk(MANTIS_ERROR, 1, "Out of memory (?) .....");
+	return -ENOMEM;
+}
+
+static inline int mantis_calc_lines(struct mantis_pci *mantis)
+{
+	mantis->line_bytes = MANTIS_BLOCK_BYTES;
+	mantis->line_count = MANTIS_BLOCK_COUNT;
+
+	while (mantis->line_bytes > 4095) {
+		mantis->line_bytes >>= 1;
+		mantis->line_count <<= 1;
+	}
+
+	dprintk(MANTIS_DEBUG, 1, "Mantis RISC block bytes=[%d], line bytes=[%d], line count=[%d]",
+		MANTIS_BLOCK_BYTES, mantis->line_bytes, mantis->line_count);
+
+	if (mantis->line_count > 255) {
+		dprintk(MANTIS_ERROR, 1, "Buffer size error");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+int mantis_dma_init(struct mantis_pci *mantis)
+{
+	int err = 0;
+
+	dprintk(MANTIS_DEBUG, 1, "Mantis DMA init");
+	if (mantis_alloc_buffers(mantis) < 0) {
+		dprintk(MANTIS_ERROR, 1, "Error allocating DMA buffer");
+
+		/* Stop RISC Engine */
+		mmwrite(0, MANTIS_DMA_CTL);
+
+		goto err;
+	}
+	err = mantis_calc_lines(mantis);
+	if (err < 0) {
+		dprintk(MANTIS_ERROR, 1, "Mantis calc lines failed");
+
+		goto err;
+	}
+
+	return 0;
+err:
+	return err;
+}
+EXPORT_SYMBOL_GPL(mantis_dma_init);
+
+static inline void mantis_risc_program(struct mantis_pci *mantis)
+{
+	u32 buf_pos = 0;
+	u32 line;
+
+	dprintk(MANTIS_DEBUG, 1, "Mantis create RISC program");
+	RISC_FLUSH();
+
+	dprintk(MANTIS_DEBUG, 1, "risc len lines %u, bytes per line %u",
+		mantis->line_count, mantis->line_bytes);
+
+	for (line = 0; line < mantis->line_count; line++) {
+		dprintk(MANTIS_DEBUG, 1, "RISC PROG line=[%d]", line);
+		if (!(buf_pos % MANTIS_BLOCK_BYTES)) {
+			RISC_INSTR(RISC_WRITE	|
+				   RISC_IRQ	|
+				   RISC_STATUS(((buf_pos / MANTIS_BLOCK_BYTES) +
+				   (MANTIS_BLOCK_COUNT - 1)) %
+				    MANTIS_BLOCK_COUNT) |
+				    mantis->line_bytes);
+		} else {
+			RISC_INSTR(RISC_WRITE	| mantis->line_bytes);
+		}
+		RISC_INSTR(mantis->buf_dma + buf_pos);
+		buf_pos += mantis->line_bytes;
+	}
+	RISC_INSTR(RISC_JUMP);
+	RISC_INSTR(mantis->risc_dma);
+}
+
+void mantis_dma_start(struct mantis_pci *mantis)
+{
+	dprintk(MANTIS_DEBUG, 1, "Mantis Start DMA engine");
+
+	mantis_risc_program(mantis);
+	mmwrite(mantis->risc_dma, MANTIS_RISC_START);
+	mmwrite(mmread(MANTIS_GPIF_ADDR) | MANTIS_GPIF_HIFRDWRN, MANTIS_GPIF_ADDR);
+
+	mmwrite(0, MANTIS_DMA_CTL);
+	mantis->last_block = mantis->finished_block = 0;
+
+	mmwrite(mmread(MANTIS_INT_MASK) | MANTIS_INT_RISCI, MANTIS_INT_MASK);
+
+	mmwrite(MANTIS_FIFO_EN | MANTIS_DCAP_EN
+			       | MANTIS_RISC_EN, MANTIS_DMA_CTL);
+
+}
+
+void mantis_dma_stop(struct mantis_pci *mantis)
+{
+	u32 stat = 0, mask = 0;
+
+	stat = mmread(MANTIS_INT_STAT);
+	mask = mmread(MANTIS_INT_MASK);
+	dprintk(MANTIS_DEBUG, 1, "Mantis Stop DMA engine");
+
+	mmwrite((mmread(MANTIS_GPIF_ADDR) & (~(MANTIS_GPIF_HIFRDWRN))), MANTIS_GPIF_ADDR);
+
+	mmwrite((mmread(MANTIS_DMA_CTL) & ~(MANTIS_FIFO_EN |
+					    MANTIS_DCAP_EN |
+					    MANTIS_RISC_EN)), MANTIS_DMA_CTL);
+
+	mmwrite(mmread(MANTIS_INT_STAT), MANTIS_INT_STAT);
+
+	mmwrite(mmread(MANTIS_INT_MASK) & ~(MANTIS_INT_RISCI |
+					    MANTIS_INT_RISCEN), MANTIS_INT_MASK);
+}
+
+
+void mantis_dma_xfer(unsigned long data)
+{
+	struct mantis_pci *mantis = (struct mantis_pci *) data;
+	struct mantis_hwconfig *config = mantis->hwconfig;
+
+	while (mantis->last_block != mantis->finished_block) {
+		dprintk(MANTIS_DEBUG, 1, "last block=[%d] finished block=[%d]",
+			mantis->last_block, mantis->finished_block);
+
+		(config->ts_size ? dvb_dmx_swfilter_204 : dvb_dmx_swfilter)
+		(&mantis->demux, &mantis->buf_cpu[mantis->last_block * MANTIS_BLOCK_BYTES], MANTIS_BLOCK_BYTES);
+		mantis->last_block = (mantis->last_block + 1) % MANTIS_BLOCK_COUNT;
+	}
+}