1 files changed, 256 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..46202a4012aa
--- /dev/null
+++ b/drivers/media/dvb/mantis/mantis_dma.c
@@ -0,0 +1,256 @@
+/*
+        Mantis PCI bridge driver
+
+        Copyright (C) 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 <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 "dmxdev.h"
+#include "dvbdev.h"
+#include "dvb_demux.h"
+#include "dvb_frontend.h"
+#include "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()            (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(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(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;
+}
+EXPORT_SYMBOL_GPL(mantis_dma_exit);
+
+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(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 = pci_alloc_consistent(mantis->pdev,
+                                                        MANTIS_RISC_SIZE,
+                                                        &mantis->risc_dma);
+
+                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;
+}
+
+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(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(MANTIS_ERROR, 1, "Buffer size error");
+                return -EINVAL;
+        }
+
+        return 0;
+}
+
+int mantis_dma_init(struct mantis_pci *mantis)
+{
+        int err = 0;
+
+        dprintk(MANTIS_DEBUG, 1, "Mantis DMA init");
+        if (mantis_alloc_buffers(mantis) < 0) {
+                dprintk(MANTIS_ERROR, 1, "Error allocating DMA buffer");
+
+                /* Stop RISC Engine */
+                mmwrite(0, MANTIS_DMA_CTL);
+
+                goto err;
+        }
+        err = mantis_calc_lines(mantis);
+        if (err < 0) {
+                dprintk(MANTIS_ERROR, 1, "Mantis calc lines failed");
+
+                goto err;
+        }
+
+        return 0;
+err:
+        return err;
+}
+EXPORT_SYMBOL_GPL(mantis_dma_init);
+
+static inline void mantis_risc_program(struct mantis_pci *mantis)
+{
+        u32 buf_pos = 0;
+        u32 line;
+
+        dprintk(MANTIS_DEBUG, 1, "Mantis create RISC program");
+        RISC_FLUSH();
+
+        dprintk(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(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(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->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(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);
+
+        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;
+        struct mantis_hwconfig *config = mantis->hwconfig;
+
+        while (mantis->last_block != mantis->finished_block) {
+                dprintk(MANTIS_DEBUG, 1, "last block=[%d] finished block=[%d]",
+                        mantis->last_block, mantis->finished_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;
+        }
+}