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path: root/drivers/media/pci/mantis/mantis_dma.c
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Diffstat (limited to 'drivers/media/pci/mantis/mantis_dma.c')
-rw-r--r--drivers/media/pci/mantis/mantis_dma.c230
1 files changed, 230 insertions, 0 deletions
diff --git a/drivers/media/pci/mantis/mantis_dma.c b/drivers/media/pci/mantis/mantis_dma.c
new file mode 100644
index 00000000000..566c407175a
--- /dev/null
+++ b/drivers/media/pci/mantis/mantis_dma.c
@@ -0,0 +1,230 @@
+/*
+ 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(risc_pos) (risc_pos = 0)
+#define RISC_INSTR(risc_pos, opcode) (mantis->risc_cpu[risc_pos++] = cpu_to_le32(opcode))
+
+#define MANTIS_BUF_SIZE (64 * 1024)
+#define MANTIS_BLOCK_BYTES (MANTIS_BUF_SIZE / 4)
+#define MANTIS_DMA_TR_BYTES (2 * 1024) /* upper limit: 4095 bytes. */
+#define MANTIS_BLOCK_COUNT (MANTIS_BUF_SIZE / MANTIS_BLOCK_BYTES)
+
+#define MANTIS_DMA_TR_UNITS (MANTIS_BLOCK_BYTES / MANTIS_DMA_TR_BYTES)
+/* MANTIS_BUF_SIZE / MANTIS_DMA_TR_UNITS must not exceed MANTIS_RISC_SIZE (4k RISC cmd buffer) */
+#define MANTIS_RISC_SIZE PAGE_SIZE /* RISC program must fit here. */
+
+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;
+}
+
+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;
+ }
+
+ 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, step;
+ u32 risc_pos;
+
+ dprintk(MANTIS_DEBUG, 1, "Mantis create RISC program");
+ RISC_FLUSH(risc_pos);
+
+ dprintk(MANTIS_DEBUG, 1, "risc len lines %u, bytes per line %u, bytes per DMA tr %u",
+ MANTIS_BLOCK_COUNT, MANTIS_BLOCK_BYTES, MANTIS_DMA_TR_BYTES);
+
+ for (line = 0; line < MANTIS_BLOCK_COUNT; line++) {
+ for (step = 0; step < MANTIS_DMA_TR_UNITS; step++) {
+ dprintk(MANTIS_DEBUG, 1, "RISC PROG line=[%d], step=[%d]", line, step);
+ if (step == 0) {
+ RISC_INSTR(risc_pos, RISC_WRITE |
+ RISC_IRQ |
+ RISC_STATUS(line) |
+ MANTIS_DMA_TR_BYTES);
+ } else {
+ RISC_INSTR(risc_pos, RISC_WRITE | MANTIS_DMA_TR_BYTES);
+ }
+ RISC_INSTR(risc_pos, mantis->buf_dma + buf_pos);
+ buf_pos += MANTIS_DMA_TR_BYTES;
+ }
+ }
+ RISC_INSTR(risc_pos, RISC_JUMP);
+ RISC_INSTR(risc_pos, 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->busy_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)
+{
+ 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->busy_block) {
+ dprintk(MANTIS_DEBUG, 1, "last block=[%d] finished block=[%d]",
+ mantis->last_block, mantis->busy_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;
+ }
+}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-04 08:45:06 +0000