diff options
Diffstat (limited to 'drivers/media/pci/mantis/mantis_dma.c')
| -rw-r--r-- | drivers/media/pci/mantis/mantis_dma.c | 216 |
1 files changed, 216 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 000000000..80c843936 --- /dev/null +++ b/drivers/media/pci/mantis/mantis_dma.c @@ -0,0 +1,216 @@ +// 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; + } +} |