237 lines
6.3 KiB
C
237 lines
6.3 KiB
C
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/*
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Mantis PCI bridge driver
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Copyright (C) 2005, 2006 Manu Abraham (abraham.manu@gmail.com)
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <asm/page.h>
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#include <linux/vmalloc.h>
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#include "mantis_common.h"
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#define RISC_WRITE (0x01 << 28)
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#define RISC_JUMP (0x07 << 28)
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#define RISC_IRQ (0x01 << 24)
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#define RISC_STATUS(status) ((((~status) & 0x0f) << 20) | ((status & 0x0f) << 16))
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#define RISC_FLUSH() mantis->risc_pos = 0
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#define RISC_INSTR(opcode) mantis->risc_cpu[mantis->risc_pos++] = cpu_to_le32(opcode)
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#define MANTIS_BUF_SIZE 64 * 1024
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#define MANTIS_BLOCK_BYTES (MANTIS_BUF_SIZE >> 4)
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#define MANTIS_BLOCK_COUNT (1 << 4)
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#define MANTIS_RISC_SIZE PAGE_SIZE
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int mantis_dma_exit(struct mantis_pci *mantis)
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{
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if (mantis->buf_cpu) {
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dprintk(verbose, MANTIS_ERROR, 1,
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"DMA=0x%lx cpu=0x%p size=%d",
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(unsigned long) mantis->buf_dma,
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mantis->buf_cpu,
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MANTIS_BUF_SIZE);
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pci_free_consistent(mantis->pdev, MANTIS_BUF_SIZE,
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mantis->buf_cpu, mantis->buf_dma);
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mantis->buf_cpu = NULL;
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}
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if (mantis->risc_cpu) {
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dprintk(verbose, MANTIS_ERROR, 1,
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"RISC=0x%lx cpu=0x%p size=%lx",
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(unsigned long) mantis->risc_dma,
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mantis->risc_cpu,
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MANTIS_RISC_SIZE);
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pci_free_consistent(mantis->pdev, MANTIS_RISC_SIZE,
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mantis->risc_cpu, mantis->risc_dma);
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mantis->risc_cpu = NULL;
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}
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return 0;
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}
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static inline int mantis_alloc_buffers(struct mantis_pci *mantis)
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{
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if (!mantis->buf_cpu) {
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mantis->buf_cpu = pci_alloc_consistent(mantis->pdev,
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MANTIS_BUF_SIZE,
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&mantis->buf_dma);
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if (!mantis->buf_cpu) {
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dprintk(verbose, MANTIS_ERROR, 1,
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"DMA buffer allocation failed");
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goto err;
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}
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dprintk(verbose, MANTIS_ERROR, 1,
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"DMA=0x%lx cpu=0x%p size=%d",
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(unsigned long) mantis->buf_dma,
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mantis->buf_cpu, MANTIS_BUF_SIZE);
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}
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if (!mantis->risc_cpu) {
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mantis->risc_cpu = pci_alloc_consistent(mantis->pdev,
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MANTIS_RISC_SIZE,
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&mantis->risc_dma);
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if (!mantis->risc_cpu) {
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dprintk(verbose, MANTIS_ERROR, 1,
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"RISC program allocation failed");
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mantis_dma_exit(mantis);
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goto err;
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}
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dprintk(verbose, MANTIS_ERROR, 1,
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"RISC=0x%lx cpu=0x%p size=%lx",
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(unsigned long) mantis->risc_dma,
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mantis->risc_cpu, MANTIS_RISC_SIZE);
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}
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return 0;
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err:
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dprintk(verbose, MANTIS_ERROR, 1, "Out of memory (?) .....");
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return -ENOMEM;
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}
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static inline int mantis_calc_lines(struct mantis_pci *mantis)
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{
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mantis->line_bytes = MANTIS_BLOCK_BYTES;
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mantis->line_count = MANTIS_BLOCK_COUNT;
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while (mantis->line_bytes > 4095) {
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mantis->line_bytes >>= 1;
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mantis->line_count <<= 1;
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}
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dprintk(verbose, MANTIS_DEBUG, 1,
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"Mantis RISC block bytes=[%d], line bytes=[%d], line count=[%d]",
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MANTIS_BLOCK_BYTES, mantis->line_bytes, mantis->line_count);
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if (mantis->line_count > 255) {
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dprintk(verbose, MANTIS_ERROR, 1, "Buffer size error");
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return -EINVAL;
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}
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return 0;
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}
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int mantis_dma_init(struct mantis_pci *mantis)
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{
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int err = 0;
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dprintk(verbose, MANTIS_DEBUG, 1, "Mantis DMA init");
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if (mantis_alloc_buffers(mantis) < 0) {
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dprintk(verbose, MANTIS_ERROR, 1, "Error allocating DMA buffer");
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// Stop RISC Engine
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// mmwrite(mmread(MANTIS_DMA_CTL) & ~MANTIS_RISC_EN, MANTIS_DMA_CTL);
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mmwrite(0, MANTIS_DMA_CTL);
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goto err;
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}
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if ((err = mantis_calc_lines(mantis)) < 0) {
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dprintk(verbose, MANTIS_ERROR, 1, "Mantis calc lines failed");
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goto err;
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}
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return 0;
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err:
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return err;
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}
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static inline void mantis_risc_program(struct mantis_pci *mantis)
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{
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u32 buf_pos = 0;
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u32 line;
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dprintk(verbose, MANTIS_DEBUG, 1, "Mantis create RISC program");
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RISC_FLUSH();
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dprintk(verbose, MANTIS_DEBUG, 1, "risc len lines %u, bytes per line %u",
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mantis->line_count, mantis->line_bytes);
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for (line = 0; line < mantis->line_count; line++) {
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dprintk(verbose, MANTIS_DEBUG, 1, "RISC PROG line=[%d]", line);
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if (!(buf_pos % MANTIS_BLOCK_BYTES)) {
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RISC_INSTR(RISC_WRITE |
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RISC_IRQ |
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RISC_STATUS(((buf_pos / MANTIS_BLOCK_BYTES) +
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(MANTIS_BLOCK_COUNT - 1)) %
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MANTIS_BLOCK_COUNT) |
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mantis->line_bytes);
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} else {
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RISC_INSTR(RISC_WRITE | mantis->line_bytes);
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}
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RISC_INSTR(mantis->buf_dma + buf_pos);
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buf_pos += mantis->line_bytes;
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}
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RISC_INSTR(RISC_JUMP);
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RISC_INSTR(mantis->risc_dma);
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}
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void mantis_dma_start(struct mantis_pci *mantis)
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{
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dprintk(verbose, MANTIS_DEBUG, 1, "Mantis Start DMA engine");
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mantis_risc_program(mantis);
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mmwrite(cpu_to_le32(mantis->risc_dma), MANTIS_RISC_START);
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mmwrite(MANTIS_GPIF_RDWRN, MANTIS_GPIF_ADDR);
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mmwrite(0, MANTIS_DMA_CTL);
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mantis->last_block = mantis->finished_block = 0;
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mmwrite(mmread(MANTIS_INT_MASK) | MANTIS_INT_RISCI, MANTIS_INT_MASK);
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mmwrite(MANTIS_FIFO_EN | MANTIS_DCAP_EN
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| MANTIS_RISC_EN, MANTIS_DMA_CTL);
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}
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void mantis_dma_stop(struct mantis_pci *mantis)
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{
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u32 stat = 0, mask = 0;
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stat = mmread(MANTIS_INT_STAT);
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mask = mmread(MANTIS_INT_MASK);
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dprintk(verbose, MANTIS_DEBUG, 1, "Mantis Stop DMA engine");
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mmwrite((mmread(MANTIS_DMA_CTL) & ~(MANTIS_FIFO_EN |
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MANTIS_DCAP_EN |
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MANTIS_RISC_EN)), MANTIS_DMA_CTL);
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mmwrite(mmread(MANTIS_INT_STAT), MANTIS_INT_STAT);
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mmwrite(mmread(MANTIS_INT_MASK) & ~(MANTIS_INT_RISCI |
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MANTIS_INT_RISCEN), MANTIS_INT_MASK);
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}
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void mantis_dma_xfer(unsigned long data)
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{
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struct mantis_pci *mantis = (struct mantis_pci *) data;
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while (mantis->last_block != mantis->finished_block) {
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dprintk(verbose, MANTIS_DEBUG, 1, "last block=[%d] finished block=[%d]",
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mantis->last_block, mantis->finished_block);
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(mantis->ts_size ? dvb_dmx_swfilter_204: dvb_dmx_swfilter)
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(&mantis->demux, &mantis->buf_cpu[mantis->last_block * MANTIS_BLOCK_BYTES], MANTIS_BLOCK_BYTES);
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mantis->last_block = (mantis->last_block + 1) % MANTIS_BLOCK_COUNT;
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}
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}
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