mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-23 13:00:33 +07:00
79d06d4dff
With VDR streaming HDTV into network, generating an interrupt once per 16kb, implemented in this patch, seems to support more robust throughput with HDTV. Fix leaking almost 64kb data from the previous TS after changing the TS. One effect of the old version was, that the DMA transfer and driver's DMA buffer access might happen at the same time - a race condition. Signed-off-by: Marko M. Ristola <marko.ristola@kolumbus.fi> Reviewed-by: Manu Abraham <manu@linuxtv.org> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
235 lines
6.3 KiB
C
235 lines
6.3 KiB
C
/*
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Mantis PCI bridge driver
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Copyright (C) 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 <linux/kernel.h>
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#include <asm/page.h>
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#include <linux/vmalloc.h>
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#include <linux/pci.h>
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#include <asm/irq.h>
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#include <linux/signal.h>
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#include <linux/sched.h>
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#include <linux/interrupt.h>
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#include "dmxdev.h"
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#include "dvbdev.h"
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#include "dvb_demux.h"
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#include "dvb_frontend.h"
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#include "dvb_net.h"
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#include "mantis_common.h"
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#include "mantis_reg.h"
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#include "mantis_dma.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(risc_pos) (risc_pos = 0)
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#define RISC_INSTR(risc_pos, opcode) (mantis->risc_cpu[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_DMA_TR_BYTES (2 * 1024) /* upper limit: 4095 bytes. */
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#define MANTIS_BLOCK_COUNT (MANTIS_BUF_SIZE / MANTIS_BLOCK_BYTES)
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#define MANTIS_DMA_TR_UNITS (MANTIS_BLOCK_BYTES / MANTIS_DMA_TR_BYTES)
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/* MANTIS_BUF_SIZE / MANTIS_DMA_TR_UNITS must not exceed MANTIS_RISC_SIZE (4k RISC cmd buffer) */
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#define MANTIS_RISC_SIZE PAGE_SIZE /* RISC program must fit here. */
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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(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(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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EXPORT_SYMBOL_GPL(mantis_dma_exit);
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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(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(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(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(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(MANTIS_ERROR, 1, "Out of memory (?) .....");
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return -ENOMEM;
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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(MANTIS_DEBUG, 1, "Mantis DMA init");
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if (mantis_alloc_buffers(mantis) < 0) {
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dprintk(MANTIS_ERROR, 1, "Error allocating DMA buffer");
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/* Stop RISC Engine */
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mmwrite(0, MANTIS_DMA_CTL);
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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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EXPORT_SYMBOL_GPL(mantis_dma_init);
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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, step;
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u32 risc_pos;
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dprintk(MANTIS_DEBUG, 1, "Mantis create RISC program");
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RISC_FLUSH(risc_pos);
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dprintk(MANTIS_DEBUG, 1, "risc len lines %u, bytes per line %u, bytes per DMA tr %u",
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MANTIS_BLOCK_COUNT, MANTIS_BLOCK_BYTES, MANTIS_DMA_TR_BYTES);
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for (line = 0; line < MANTIS_BLOCK_COUNT; line++) {
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for (step = 0; step < MANTIS_DMA_TR_UNITS; step++) {
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dprintk(MANTIS_DEBUG, 1, "RISC PROG line=[%d], step=[%d]", line, step);
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if (step == 0) {
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RISC_INSTR(risc_pos, RISC_WRITE |
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RISC_IRQ |
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RISC_STATUS(line) |
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MANTIS_DMA_TR_BYTES);
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} else {
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RISC_INSTR(risc_pos, RISC_WRITE | MANTIS_DMA_TR_BYTES);
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}
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RISC_INSTR(risc_pos, mantis->buf_dma + buf_pos);
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buf_pos += MANTIS_DMA_TR_BYTES;
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}
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}
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RISC_INSTR(risc_pos, RISC_JUMP);
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RISC_INSTR(risc_pos, 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(MANTIS_DEBUG, 1, "Mantis Start DMA engine");
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mantis_risc_program(mantis);
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mmwrite(mantis->risc_dma, MANTIS_RISC_START);
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mmwrite(mmread(MANTIS_GPIF_ADDR) | MANTIS_GPIF_HIFRDWRN, MANTIS_GPIF_ADDR);
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mmwrite(0, MANTIS_DMA_CTL);
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mantis->last_block = mantis->busy_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(MANTIS_DEBUG, 1, "Mantis Stop DMA engine");
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mmwrite((mmread(MANTIS_GPIF_ADDR) & (~(MANTIS_GPIF_HIFRDWRN))), MANTIS_GPIF_ADDR);
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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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struct mantis_hwconfig *config = mantis->hwconfig;
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while (mantis->last_block != mantis->busy_block) {
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dprintk(MANTIS_DEBUG, 1, "last block=[%d] finished block=[%d]",
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mantis->last_block, mantis->busy_block);
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(config->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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