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// SPDX-License-Identifier: GPL-2.0-or-later
/*
Mantis PCI bridge driver
Copyright (C) Manu Abraham (abraham.manu@gmail.com)
*/
#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 <media/dmxdev.h>
#include <media/dvbdev.h>
#include <media/dvb_demux.h>
#include <media/dvb_frontend.h>
#include <media/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);
dma_free_coherent(&mantis->pdev->dev, 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);
dma_free_coherent(&mantis->pdev->dev, 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 = dma_alloc_coherent(&mantis->pdev->dev,
MANTIS_BUF_SIZE,
&mantis->buf_dma, GFP_KERNEL);
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 = dma_alloc_coherent(&mantis->pdev->dev,
MANTIS_RISC_SIZE,
&mantis->risc_dma, GFP_KERNEL);
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;
dprintk(MANTIS_DEBUG, 1, "Mantis DMA init");
err = mantis_alloc_buffers(mantis);
if (err < 0) {
dprintk(MANTIS_ERROR, 1, "Error allocating DMA buffer");
/* Stop RISC Engine */
mmwrite(0, MANTIS_DMA_CTL);
return err;
}
return 0;
}
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;
mantis_unmask_ints(mantis, MANTIS_INT_RISCI);
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);
mantis_mask_ints(mantis, MANTIS_INT_RISCI | MANTIS_INT_RISCEN);
}
void mantis_dma_xfer(struct tasklet_struct *t)
{
struct mantis_pci *mantis = from_tasklet(mantis, t, tasklet);
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;
}
}
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