diff options
author | Manu Abraham <abraham.manu@gmail.com> | 2009-12-03 03:57:10 +0300 |
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committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2010-01-17 16:55:27 +0300 |
commit | 41e840b13e111ba18b138d055ddd250bd5ad5e39 (patch) | |
tree | dd5c1a60f06549925277c396a964724dd87329e1 /drivers/media/dvb/mantis/mantis_dma.c | |
parent | 6ccf80eb15ccaca4d3f1ab5162b9ded5eecd9971 (diff) | |
download | linux-41e840b13e111ba18b138d055ddd250bd5ad5e39.tar.xz |
V4L/DVB (13699): [Mantis, MB86A16] Initial checkin: Mantis, MB86A16
Signed-off-by: Manu Abraham <manu@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/dvb/mantis/mantis_dma.c')
-rw-r--r-- | drivers/media/dvb/mantis/mantis_dma.c | 238 |
1 files changed, 238 insertions, 0 deletions
diff --git a/drivers/media/dvb/mantis/mantis_dma.c b/drivers/media/dvb/mantis/mantis_dma.c new file mode 100644 index 000000000000..9e3aa5ec1645 --- /dev/null +++ b/drivers/media/dvb/mantis/mantis_dma.c @@ -0,0 +1,238 @@ +/* + Mantis PCI bridge driver + + Copyright (C) 2005, 2006 Manu Abraham (abraham.manu@gmail.com) + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. +*/ + +#include <asm/page.h> +#include <linux/vmalloc.h> +#include "mantis_common.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() mantis->risc_pos = 0 +#define RISC_INSTR(opcode) mantis->risc_cpu[mantis->risc_pos++] = cpu_to_le32(opcode) + +#define MANTIS_BUF_SIZE 64 * 1024 +#define MANTIS_BLOCK_BYTES (MANTIS_BUF_SIZE >> 4) +#define MANTIS_BLOCK_COUNT (1 << 4) +#define MANTIS_RISC_SIZE PAGE_SIZE + +int mantis_dma_exit(struct mantis_pci *mantis) +{ + if (mantis->buf_cpu) { + dprintk(verbose, MANTIS_ERROR, 1, + "DMA=0x%lx cpu=0x%p size=%d", + (unsigned long) mantis->buf_dma, + mantis->buf_cpu, + MANTIS_BUF_SIZE); + + pci_free_consistent(mantis->pdev, MANTIS_BUF_SIZE, + mantis->buf_cpu, mantis->buf_dma); + + mantis->buf_cpu = NULL; + } + if (mantis->risc_cpu) { + dprintk(verbose, MANTIS_ERROR, 1, + "RISC=0x%lx cpu=0x%p size=%lx", + (unsigned long) mantis->risc_dma, + mantis->risc_cpu, + MANTIS_RISC_SIZE); + + pci_free_consistent(mantis->pdev, MANTIS_RISC_SIZE, + mantis->risc_cpu, mantis->risc_dma); + + mantis->risc_cpu = NULL; + } + + return 0; +} + +static inline int mantis_alloc_buffers(struct mantis_pci *mantis) +{ + if (!mantis->buf_cpu) { + mantis->buf_cpu = pci_alloc_consistent(mantis->pdev, + MANTIS_BUF_SIZE, + &mantis->buf_dma); + if (!mantis->buf_cpu) { + dprintk(verbose, MANTIS_ERROR, 1, + "DMA buffer allocation failed"); + + goto err; + } + dprintk(verbose, 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 = pci_alloc_consistent(mantis->pdev, + MANTIS_RISC_SIZE, + &mantis->risc_dma); + + if (!mantis->risc_cpu) { + dprintk(verbose, MANTIS_ERROR, 1, + "RISC program allocation failed"); + + mantis_dma_exit(mantis); + + goto err; + } + dprintk(verbose, 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(verbose, MANTIS_ERROR, 1, "Out of memory (?) ....."); + return -ENOMEM; +} + +static inline int mantis_calc_lines(struct mantis_pci *mantis) +{ + mantis->line_bytes = MANTIS_BLOCK_BYTES; + mantis->line_count = MANTIS_BLOCK_COUNT; + + while (mantis->line_bytes > 4095) { + mantis->line_bytes >>= 1; + mantis->line_count <<= 1; + } + + dprintk(verbose, MANTIS_DEBUG, 1, + "Mantis RISC block bytes=[%d], line bytes=[%d], line count=[%d]", + MANTIS_BLOCK_BYTES, mantis->line_bytes, mantis->line_count); + + if (mantis->line_count > 255) { + dprintk(verbose, MANTIS_ERROR, 1, "Buffer size error"); + return -EINVAL; + } + + return 0; +} + +int mantis_dma_init(struct mantis_pci *mantis) +{ + int err = 0; + + dprintk(verbose, MANTIS_DEBUG, 1, "Mantis DMA init"); + if (mantis_alloc_buffers(mantis) < 0) { + dprintk(verbose, MANTIS_ERROR, 1, "Error allocating DMA buffer"); + + // Stop RISC Engine +// mmwrite(mmread(MANTIS_DMA_CTL) & ~MANTIS_RISC_EN, MANTIS_DMA_CTL); + mmwrite(0, MANTIS_DMA_CTL); + + goto err; + } + if ((err = mantis_calc_lines(mantis)) < 0) { + dprintk(verbose, MANTIS_ERROR, 1, "Mantis calc lines failed"); + + goto err; + } + + return 0; +err: + return err; +} + + + +static inline void mantis_risc_program(struct mantis_pci *mantis) +{ + u32 buf_pos = 0; + u32 line; + + dprintk(verbose, MANTIS_DEBUG, 1, "Mantis create RISC program"); + RISC_FLUSH(); + + dprintk(verbose, MANTIS_DEBUG, 1, "risc len lines %u, bytes per line %u", + mantis->line_count, mantis->line_bytes); + + for (line = 0; line < mantis->line_count; line++) { + dprintk(verbose, MANTIS_DEBUG, 1, "RISC PROG line=[%d]", line); + if (!(buf_pos % MANTIS_BLOCK_BYTES)) { + RISC_INSTR(RISC_WRITE | + RISC_IRQ | + RISC_STATUS(((buf_pos / MANTIS_BLOCK_BYTES) + + (MANTIS_BLOCK_COUNT - 1)) % + MANTIS_BLOCK_COUNT) | + mantis->line_bytes); + } else { + RISC_INSTR(RISC_WRITE | mantis->line_bytes); + } + RISC_INSTR(mantis->buf_dma + buf_pos); + buf_pos += mantis->line_bytes; + } + RISC_INSTR(RISC_JUMP); + RISC_INSTR(mantis->risc_dma); +} + +void mantis_dma_start(struct mantis_pci *mantis) +{ + dprintk(verbose, MANTIS_DEBUG, 1, "Mantis Start DMA engine"); + + mantis_risc_program(mantis); + mmwrite(cpu_to_le32(mantis->risc_dma), MANTIS_RISC_START); + mmwrite(MANTIS_GPIF_RDWRN, MANTIS_GPIF_ADDR); + + mmwrite(0, MANTIS_DMA_CTL); + mantis->last_block = mantis->finished_block = 0; + + mmwrite(mmread(MANTIS_INT_MASK) | MANTIS_INT_RISCI, MANTIS_INT_MASK); + + mmwrite(MANTIS_FIFO_EN | MANTIS_DCAP_EN + | MANTIS_RISC_EN, MANTIS_DMA_CTL); + +} + +void mantis_dma_stop(struct mantis_pci *mantis) +{ + u32 stat = 0, mask = 0; + + stat = mmread(MANTIS_INT_STAT); + mask = mmread(MANTIS_INT_MASK); + dprintk(verbose, MANTIS_DEBUG, 1, "Mantis Stop DMA engine"); + + 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); + + mmwrite(mmread(MANTIS_INT_MASK) & ~(MANTIS_INT_RISCI | + MANTIS_INT_RISCEN), MANTIS_INT_MASK); +} + + +void mantis_dma_xfer(unsigned long data) +{ + struct mantis_pci *mantis = (struct mantis_pci *) data; + + while (mantis->last_block != mantis->finished_block) { + dprintk(verbose, MANTIS_DEBUG, 1, "last block=[%d] finished block=[%d]", + mantis->last_block, mantis->finished_block); + + (mantis->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; + } +} |