224 lines
6.5 KiB
C
224 lines
6.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* tw68_risc.c
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* Part of the device driver for Techwell 68xx based cards
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*
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* Much of this code is derived from the cx88 and sa7134 drivers, which
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* were in turn derived from the bt87x driver. The original work was by
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* Gerd Knorr; more recently the code was enhanced by Mauro Carvalho Chehab,
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* Hans Verkuil, Andy Walls and many others. Their work is gratefully
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* acknowledged. Full credit goes to them - any problems within this code
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* are mine.
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*
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* Copyright (C) 2009 William M. Brack
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*
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* Refactored and updated to the latest v4l core frameworks:
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*
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* Copyright (C) 2014 Hans Verkuil <hverkuil@xs4all.nl>
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*/
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#include "tw68.h"
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/**
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* tw68_risc_field
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* @rp: pointer to current risc program position
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* @sglist: pointer to "scatter-gather list" of buffer pointers
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* @offset: offset to target memory buffer
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* @sync_line: 0 -> no sync, 1 -> odd sync, 2 -> even sync
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* @bpl: number of bytes per scan line
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* @padding: number of bytes of padding to add
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* @lines: number of lines in field
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* @jump: insert a jump at the start
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*/
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static __le32 *tw68_risc_field(__le32 *rp, struct scatterlist *sglist,
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unsigned int offset, u32 sync_line,
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unsigned int bpl, unsigned int padding,
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unsigned int lines, bool jump)
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{
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struct scatterlist *sg;
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unsigned int line, todo, done;
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if (jump) {
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*(rp++) = cpu_to_le32(RISC_JUMP);
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*(rp++) = 0;
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}
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/* sync instruction */
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if (sync_line == 1)
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*(rp++) = cpu_to_le32(RISC_SYNCO);
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else
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*(rp++) = cpu_to_le32(RISC_SYNCE);
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*(rp++) = 0;
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/* scan lines */
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sg = sglist;
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for (line = 0; line < lines; line++) {
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/* calculate next starting position */
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while (offset && offset >= sg_dma_len(sg)) {
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offset -= sg_dma_len(sg);
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sg = sg_next(sg);
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}
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if (bpl <= sg_dma_len(sg) - offset) {
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/* fits into current chunk */
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*(rp++) = cpu_to_le32(RISC_LINESTART |
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/* (offset<<12) |*/ bpl);
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*(rp++) = cpu_to_le32(sg_dma_address(sg) + offset);
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offset += bpl;
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} else {
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/*
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* scanline needs to be split. Put the start in
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* whatever memory remains using RISC_LINESTART,
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* then the remainder into following addresses
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* given by the scatter-gather list.
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*/
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todo = bpl; /* one full line to be done */
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/* first fragment */
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done = (sg_dma_len(sg) - offset);
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*(rp++) = cpu_to_le32(RISC_LINESTART |
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(7 << 24) |
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done);
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*(rp++) = cpu_to_le32(sg_dma_address(sg) + offset);
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todo -= done;
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sg = sg_next(sg);
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/* succeeding fragments have no offset */
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while (todo > sg_dma_len(sg)) {
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*(rp++) = cpu_to_le32(RISC_INLINE |
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(done << 12) |
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sg_dma_len(sg));
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*(rp++) = cpu_to_le32(sg_dma_address(sg));
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todo -= sg_dma_len(sg);
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sg = sg_next(sg);
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done += sg_dma_len(sg);
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}
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if (todo) {
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/* final chunk - offset 0, count 'todo' */
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*(rp++) = cpu_to_le32(RISC_INLINE |
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(done << 12) |
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todo);
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*(rp++) = cpu_to_le32(sg_dma_address(sg));
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}
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offset = todo;
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}
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offset += padding;
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}
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return rp;
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}
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/**
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* tw68_risc_buffer
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*
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* This routine is called by tw68-video. It allocates
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* memory for the dma controller "program" and then fills in that
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* memory with the appropriate "instructions".
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*
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* @pci: structure with info about the pci
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* slot which our device is in.
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* @buf: structure with info about the memory
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* used for our controller program.
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* @sglist: scatter-gather list entry
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* @top_offset: offset within the risc program area for the
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* first odd frame line
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* @bottom_offset: offset within the risc program area for the
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* first even frame line
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* @bpl: number of data bytes per scan line
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* @padding: number of extra bytes to add at end of line
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* @lines: number of scan lines
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*/
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int tw68_risc_buffer(struct pci_dev *pci,
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struct tw68_buf *buf,
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struct scatterlist *sglist,
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unsigned int top_offset,
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unsigned int bottom_offset,
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unsigned int bpl,
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unsigned int padding,
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unsigned int lines)
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{
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u32 instructions, fields;
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__le32 *rp;
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fields = 0;
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if (UNSET != top_offset)
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fields++;
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if (UNSET != bottom_offset)
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fields++;
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/*
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* estimate risc mem: worst case is one write per page border +
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* one write per scan line + syncs + 2 jumps (all 2 dwords).
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* Padding can cause next bpl to start close to a page border.
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* First DMA region may be smaller than PAGE_SIZE
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*/
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instructions = fields * (1 + (((bpl + padding) * lines) /
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PAGE_SIZE) + lines) + 4;
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buf->size = instructions * 8;
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buf->cpu = dma_alloc_coherent(&pci->dev, buf->size, &buf->dma,
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GFP_KERNEL);
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if (buf->cpu == NULL)
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return -ENOMEM;
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/* write risc instructions */
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rp = buf->cpu;
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if (UNSET != top_offset) /* generates SYNCO */
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rp = tw68_risc_field(rp, sglist, top_offset, 1,
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bpl, padding, lines, true);
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if (UNSET != bottom_offset) /* generates SYNCE */
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rp = tw68_risc_field(rp, sglist, bottom_offset, 2,
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bpl, padding, lines, top_offset == UNSET);
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/* save pointer to jmp instruction address */
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buf->jmp = rp;
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buf->cpu[1] = cpu_to_le32(buf->dma + 8);
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/* assure risc buffer hasn't overflowed */
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BUG_ON((buf->jmp - buf->cpu + 2) * sizeof(buf->cpu[0]) > buf->size);
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return 0;
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}
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#if 0
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/* ------------------------------------------------------------------ */
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/* debug helper code */
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static void tw68_risc_decode(u32 risc, u32 addr)
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{
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#define RISC_OP(reg) (((reg) >> 28) & 7)
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static struct instr_details {
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char *name;
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u8 has_data_type;
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u8 has_byte_info;
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u8 has_addr;
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} instr[8] = {
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[RISC_OP(RISC_SYNCO)] = {"syncOdd", 0, 0, 0},
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[RISC_OP(RISC_SYNCE)] = {"syncEven", 0, 0, 0},
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[RISC_OP(RISC_JUMP)] = {"jump", 0, 0, 1},
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[RISC_OP(RISC_LINESTART)] = {"lineStart", 1, 1, 1},
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[RISC_OP(RISC_INLINE)] = {"inline", 1, 1, 1},
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};
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u32 p;
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p = RISC_OP(risc);
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if (!(risc & 0x80000000) || !instr[p].name) {
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pr_debug("0x%08x [ INVALID ]\n", risc);
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return;
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}
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pr_debug("0x%08x %-9s IRQ=%d",
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risc, instr[p].name, (risc >> 27) & 1);
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if (instr[p].has_data_type)
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pr_debug(" Type=%d", (risc >> 24) & 7);
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if (instr[p].has_byte_info)
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pr_debug(" Start=0x%03x Count=%03u",
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(risc >> 12) & 0xfff, risc & 0xfff);
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if (instr[p].has_addr)
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pr_debug(" StartAddr=0x%08x", addr);
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pr_debug("\n");
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}
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void tw68_risc_program_dump(struct tw68_core *core, struct tw68_buf *buf)
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{
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const __le32 *addr;
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pr_debug("%s: risc_program_dump: risc=%p, buf->cpu=0x%p, buf->jmp=0x%p\n",
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core->name, buf, buf->cpu, buf->jmp);
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for (addr = buf->cpu; addr <= buf->jmp; addr += 2)
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tw68_risc_decode(*addr, *(addr+1));
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}
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#endif
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