// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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Mantis PCI bridge driver
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Copyright (C) Manu Abraham (abraham.manu@gmail.com)
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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 <media/dmxdev.h>
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#include <media/dvbdev.h>
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#include <media/dvb_demux.h>
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#include <media/dvb_frontend.h>
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#include <media/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;
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dprintk(MANTIS_DEBUG, 1, "Mantis DMA init");
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err = mantis_alloc_buffers(mantis);
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if (err < 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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return err;
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}
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return 0;
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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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mantis_unmask_ints(mantis, MANTIS_INT_RISCI);
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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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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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mantis_mask_ints(mantis, MANTIS_INT_RISCI | MANTIS_INT_RISCEN);
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}
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void mantis_dma_xfer(struct tasklet_struct *t)
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{
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struct mantis_pci *mantis = from_tasklet(mantis, t, tasklet);
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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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