![Linus Torvalds](/assets/img/avatar_default.png)
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
1087 lines
26 KiB
C
1087 lines
26 KiB
C
/*
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* linux/arch/arm/omap/dma.c
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*
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* Copyright (C) 2003 Nokia Corporation
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* Author: Juha Yrjölä <juha.yrjola@nokia.com>
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* DMA channel linking for 1610 by Samuel Ortiz <samuel.ortiz@nokia.com>
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* Graphics DMA and LCD DMA graphics tranformations
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* by Imre Deak <imre.deak@nokia.com>
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* Some functions based on earlier dma-omap.c Copyright (C) 2001 RidgeRun, Inc.
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*
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* Support functions for the OMAP internal DMA channels.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/sched.h>
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#include <linux/spinlock.h>
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#include <linux/errno.h>
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#include <linux/interrupt.h>
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#include <asm/system.h>
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#include <asm/irq.h>
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#include <asm/hardware.h>
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#include <asm/dma.h>
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#include <asm/io.h>
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#include <asm/arch/tc.h>
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#define OMAP_DMA_ACTIVE 0x01
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#define OMAP_DMA_CCR_EN (1 << 7)
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#define OMAP_FUNC_MUX_ARM_BASE (0xfffe1000 + 0xec)
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static int enable_1510_mode = 0;
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struct omap_dma_lch {
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int next_lch;
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int dev_id;
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u16 saved_csr;
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u16 enabled_irqs;
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const char *dev_name;
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void (* callback)(int lch, u16 ch_status, void *data);
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void *data;
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long flags;
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};
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static int dma_chan_count;
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static spinlock_t dma_chan_lock;
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static struct omap_dma_lch dma_chan[OMAP_LOGICAL_DMA_CH_COUNT];
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const static u8 dma_irq[OMAP_LOGICAL_DMA_CH_COUNT] = {
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INT_DMA_CH0_6, INT_DMA_CH1_7, INT_DMA_CH2_8, INT_DMA_CH3,
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INT_DMA_CH4, INT_DMA_CH5, INT_1610_DMA_CH6, INT_1610_DMA_CH7,
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INT_1610_DMA_CH8, INT_1610_DMA_CH9, INT_1610_DMA_CH10,
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INT_1610_DMA_CH11, INT_1610_DMA_CH12, INT_1610_DMA_CH13,
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INT_1610_DMA_CH14, INT_1610_DMA_CH15, INT_DMA_LCD
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};
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static inline int get_gdma_dev(int req)
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{
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u32 reg = OMAP_FUNC_MUX_ARM_BASE + ((req - 1) / 5) * 4;
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int shift = ((req - 1) % 5) * 6;
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return ((omap_readl(reg) >> shift) & 0x3f) + 1;
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}
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static inline void set_gdma_dev(int req, int dev)
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{
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u32 reg = OMAP_FUNC_MUX_ARM_BASE + ((req - 1) / 5) * 4;
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int shift = ((req - 1) % 5) * 6;
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u32 l;
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l = omap_readl(reg);
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l &= ~(0x3f << shift);
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l |= (dev - 1) << shift;
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omap_writel(l, reg);
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}
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static void clear_lch_regs(int lch)
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{
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int i;
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u32 lch_base = OMAP_DMA_BASE + lch * 0x40;
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for (i = 0; i < 0x2c; i += 2)
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omap_writew(0, lch_base + i);
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}
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void omap_set_dma_priority(int dst_port, int priority)
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{
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unsigned long reg;
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u32 l;
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switch (dst_port) {
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case OMAP_DMA_PORT_OCP_T1: /* FFFECC00 */
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reg = OMAP_TC_OCPT1_PRIOR;
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break;
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case OMAP_DMA_PORT_OCP_T2: /* FFFECCD0 */
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reg = OMAP_TC_OCPT2_PRIOR;
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break;
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case OMAP_DMA_PORT_EMIFF: /* FFFECC08 */
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reg = OMAP_TC_EMIFF_PRIOR;
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break;
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case OMAP_DMA_PORT_EMIFS: /* FFFECC04 */
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reg = OMAP_TC_EMIFS_PRIOR;
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break;
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default:
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BUG();
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return;
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}
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l = omap_readl(reg);
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l &= ~(0xf << 8);
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l |= (priority & 0xf) << 8;
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omap_writel(l, reg);
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}
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void omap_set_dma_transfer_params(int lch, int data_type, int elem_count,
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int frame_count, int sync_mode)
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{
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u16 w;
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w = omap_readw(OMAP_DMA_CSDP(lch));
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w &= ~0x03;
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w |= data_type;
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omap_writew(w, OMAP_DMA_CSDP(lch));
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w = omap_readw(OMAP_DMA_CCR(lch));
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w &= ~(1 << 5);
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if (sync_mode == OMAP_DMA_SYNC_FRAME)
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w |= 1 << 5;
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omap_writew(w, OMAP_DMA_CCR(lch));
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w = omap_readw(OMAP_DMA_CCR2(lch));
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w &= ~(1 << 2);
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if (sync_mode == OMAP_DMA_SYNC_BLOCK)
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w |= 1 << 2;
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omap_writew(w, OMAP_DMA_CCR2(lch));
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omap_writew(elem_count, OMAP_DMA_CEN(lch));
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omap_writew(frame_count, OMAP_DMA_CFN(lch));
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}
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void omap_set_dma_color_mode(int lch, enum omap_dma_color_mode mode, u32 color)
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{
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u16 w;
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BUG_ON(omap_dma_in_1510_mode());
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w = omap_readw(OMAP_DMA_CCR2(lch)) & ~0x03;
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switch (mode) {
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case OMAP_DMA_CONSTANT_FILL:
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w |= 0x01;
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break;
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case OMAP_DMA_TRANSPARENT_COPY:
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w |= 0x02;
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break;
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case OMAP_DMA_COLOR_DIS:
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break;
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default:
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BUG();
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}
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omap_writew(w, OMAP_DMA_CCR2(lch));
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w = omap_readw(OMAP_DMA_LCH_CTRL(lch)) & ~0x0f;
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/* Default is channel type 2D */
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if (mode) {
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omap_writew((u16)color, OMAP_DMA_COLOR_L(lch));
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omap_writew((u16)(color >> 16), OMAP_DMA_COLOR_U(lch));
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w |= 1; /* Channel type G */
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}
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omap_writew(w, OMAP_DMA_LCH_CTRL(lch));
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}
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void omap_set_dma_src_params(int lch, int src_port, int src_amode,
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unsigned long src_start)
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{
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u16 w;
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w = omap_readw(OMAP_DMA_CSDP(lch));
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w &= ~(0x1f << 2);
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w |= src_port << 2;
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omap_writew(w, OMAP_DMA_CSDP(lch));
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w = omap_readw(OMAP_DMA_CCR(lch));
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w &= ~(0x03 << 12);
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w |= src_amode << 12;
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omap_writew(w, OMAP_DMA_CCR(lch));
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omap_writew(src_start >> 16, OMAP_DMA_CSSA_U(lch));
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omap_writew(src_start, OMAP_DMA_CSSA_L(lch));
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}
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void omap_set_dma_src_index(int lch, int eidx, int fidx)
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{
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omap_writew(eidx, OMAP_DMA_CSEI(lch));
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omap_writew(fidx, OMAP_DMA_CSFI(lch));
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}
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void omap_set_dma_src_data_pack(int lch, int enable)
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{
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u16 w;
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w = omap_readw(OMAP_DMA_CSDP(lch)) & ~(1 << 6);
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w |= enable ? (1 << 6) : 0;
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omap_writew(w, OMAP_DMA_CSDP(lch));
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}
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void omap_set_dma_src_burst_mode(int lch, enum omap_dma_burst_mode burst_mode)
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{
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u16 w;
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w = omap_readw(OMAP_DMA_CSDP(lch)) & ~(0x03 << 7);
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switch (burst_mode) {
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case OMAP_DMA_DATA_BURST_DIS:
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break;
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case OMAP_DMA_DATA_BURST_4:
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w |= (0x01 << 7);
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break;
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case OMAP_DMA_DATA_BURST_8:
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/* not supported by current hardware
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* w |= (0x03 << 7);
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* fall through
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*/
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default:
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BUG();
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}
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omap_writew(w, OMAP_DMA_CSDP(lch));
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}
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void omap_set_dma_dest_params(int lch, int dest_port, int dest_amode,
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unsigned long dest_start)
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{
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u16 w;
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w = omap_readw(OMAP_DMA_CSDP(lch));
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w &= ~(0x1f << 9);
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w |= dest_port << 9;
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omap_writew(w, OMAP_DMA_CSDP(lch));
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w = omap_readw(OMAP_DMA_CCR(lch));
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w &= ~(0x03 << 14);
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w |= dest_amode << 14;
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omap_writew(w, OMAP_DMA_CCR(lch));
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omap_writew(dest_start >> 16, OMAP_DMA_CDSA_U(lch));
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omap_writew(dest_start, OMAP_DMA_CDSA_L(lch));
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}
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void omap_set_dma_dest_index(int lch, int eidx, int fidx)
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{
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omap_writew(eidx, OMAP_DMA_CDEI(lch));
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omap_writew(fidx, OMAP_DMA_CDFI(lch));
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}
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void omap_set_dma_dest_data_pack(int lch, int enable)
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{
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u16 w;
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w = omap_readw(OMAP_DMA_CSDP(lch)) & ~(1 << 13);
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w |= enable ? (1 << 13) : 0;
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omap_writew(w, OMAP_DMA_CSDP(lch));
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}
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void omap_set_dma_dest_burst_mode(int lch, enum omap_dma_burst_mode burst_mode)
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{
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u16 w;
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w = omap_readw(OMAP_DMA_CSDP(lch)) & ~(0x03 << 14);
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switch (burst_mode) {
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case OMAP_DMA_DATA_BURST_DIS:
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break;
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case OMAP_DMA_DATA_BURST_4:
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w |= (0x01 << 14);
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break;
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case OMAP_DMA_DATA_BURST_8:
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w |= (0x03 << 14);
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break;
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default:
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printk(KERN_ERR "Invalid DMA burst mode\n");
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BUG();
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return;
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}
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omap_writew(w, OMAP_DMA_CSDP(lch));
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}
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static inline void init_intr(int lch)
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{
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u16 w;
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/* Read CSR to make sure it's cleared. */
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w = omap_readw(OMAP_DMA_CSR(lch));
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/* Enable some nice interrupts. */
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omap_writew(dma_chan[lch].enabled_irqs, OMAP_DMA_CICR(lch));
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dma_chan[lch].flags |= OMAP_DMA_ACTIVE;
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}
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static inline void enable_lnk(int lch)
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{
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u16 w;
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/* Clear the STOP_LNK bits */
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w = omap_readw(OMAP_DMA_CLNK_CTRL(lch));
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w &= ~(1 << 14);
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omap_writew(w, OMAP_DMA_CLNK_CTRL(lch));
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/* And set the ENABLE_LNK bits */
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if (dma_chan[lch].next_lch != -1)
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omap_writew(dma_chan[lch].next_lch | (1 << 15),
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OMAP_DMA_CLNK_CTRL(lch));
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}
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static inline void disable_lnk(int lch)
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{
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u16 w;
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/* Disable interrupts */
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omap_writew(0, OMAP_DMA_CICR(lch));
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/* Set the STOP_LNK bit */
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w = omap_readw(OMAP_DMA_CLNK_CTRL(lch));
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w |= (1 << 14);
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w = omap_writew(w, OMAP_DMA_CLNK_CTRL(lch));
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dma_chan[lch].flags &= ~OMAP_DMA_ACTIVE;
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}
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void omap_start_dma(int lch)
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{
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u16 w;
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if (!omap_dma_in_1510_mode() && dma_chan[lch].next_lch != -1) {
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int next_lch, cur_lch;
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char dma_chan_link_map[OMAP_LOGICAL_DMA_CH_COUNT];
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dma_chan_link_map[lch] = 1;
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/* Set the link register of the first channel */
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enable_lnk(lch);
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memset(dma_chan_link_map, 0, sizeof(dma_chan_link_map));
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cur_lch = dma_chan[lch].next_lch;
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do {
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next_lch = dma_chan[cur_lch].next_lch;
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/* The loop case: we've been here already */
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if (dma_chan_link_map[cur_lch])
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break;
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/* Mark the current channel */
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dma_chan_link_map[cur_lch] = 1;
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enable_lnk(cur_lch);
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init_intr(cur_lch);
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cur_lch = next_lch;
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} while (next_lch != -1);
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}
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init_intr(lch);
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w = omap_readw(OMAP_DMA_CCR(lch));
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w |= OMAP_DMA_CCR_EN;
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omap_writew(w, OMAP_DMA_CCR(lch));
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dma_chan[lch].flags |= OMAP_DMA_ACTIVE;
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}
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void omap_stop_dma(int lch)
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{
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u16 w;
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if (!omap_dma_in_1510_mode() && dma_chan[lch].next_lch != -1) {
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int next_lch, cur_lch = lch;
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char dma_chan_link_map[OMAP_LOGICAL_DMA_CH_COUNT];
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memset(dma_chan_link_map, 0, sizeof(dma_chan_link_map));
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do {
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/* The loop case: we've been here already */
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if (dma_chan_link_map[cur_lch])
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break;
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/* Mark the current channel */
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dma_chan_link_map[cur_lch] = 1;
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disable_lnk(cur_lch);
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next_lch = dma_chan[cur_lch].next_lch;
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cur_lch = next_lch;
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} while (next_lch != -1);
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return;
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}
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/* Disable all interrupts on the channel */
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omap_writew(0, OMAP_DMA_CICR(lch));
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w = omap_readw(OMAP_DMA_CCR(lch));
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w &= ~OMAP_DMA_CCR_EN;
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omap_writew(w, OMAP_DMA_CCR(lch));
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dma_chan[lch].flags &= ~OMAP_DMA_ACTIVE;
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}
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void omap_enable_dma_irq(int lch, u16 bits)
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{
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dma_chan[lch].enabled_irqs |= bits;
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}
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void omap_disable_dma_irq(int lch, u16 bits)
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{
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dma_chan[lch].enabled_irqs &= ~bits;
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}
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static int dma_handle_ch(int ch)
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{
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u16 csr;
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if (enable_1510_mode && ch >= 6) {
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csr = dma_chan[ch].saved_csr;
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dma_chan[ch].saved_csr = 0;
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} else
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csr = omap_readw(OMAP_DMA_CSR(ch));
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if (enable_1510_mode && ch <= 2 && (csr >> 7) != 0) {
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dma_chan[ch + 6].saved_csr = csr >> 7;
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csr &= 0x7f;
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}
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if (!csr)
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return 0;
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if (unlikely(dma_chan[ch].dev_id == -1)) {
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printk(KERN_WARNING "Spurious interrupt from DMA channel %d (CSR %04x)\n",
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ch, csr);
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return 0;
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}
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if (unlikely(csr & OMAP_DMA_TOUT_IRQ))
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printk(KERN_WARNING "DMA timeout with device %d\n", dma_chan[ch].dev_id);
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if (unlikely(csr & OMAP_DMA_DROP_IRQ))
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printk(KERN_WARNING "DMA synchronization event drop occurred with device %d\n",
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dma_chan[ch].dev_id);
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if (likely(csr & OMAP_DMA_BLOCK_IRQ))
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dma_chan[ch].flags &= ~OMAP_DMA_ACTIVE;
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if (likely(dma_chan[ch].callback != NULL))
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dma_chan[ch].callback(ch, csr, dma_chan[ch].data);
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return 1;
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}
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static irqreturn_t dma_irq_handler(int irq, void *dev_id, struct pt_regs *regs)
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{
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int ch = ((int) dev_id) - 1;
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int handled = 0;
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for (;;) {
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int handled_now = 0;
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handled_now += dma_handle_ch(ch);
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if (enable_1510_mode && dma_chan[ch + 6].saved_csr)
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handled_now += dma_handle_ch(ch + 6);
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if (!handled_now)
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break;
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handled += handled_now;
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}
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return handled ? IRQ_HANDLED : IRQ_NONE;
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}
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int omap_request_dma(int dev_id, const char *dev_name,
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void (* callback)(int lch, u16 ch_status, void *data),
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void *data, int *dma_ch_out)
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{
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int ch, free_ch = -1;
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unsigned long flags;
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struct omap_dma_lch *chan;
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spin_lock_irqsave(&dma_chan_lock, flags);
|
|
for (ch = 0; ch < dma_chan_count; ch++) {
|
|
if (free_ch == -1 && dma_chan[ch].dev_id == -1) {
|
|
free_ch = ch;
|
|
if (dev_id == 0)
|
|
break;
|
|
}
|
|
}
|
|
if (free_ch == -1) {
|
|
spin_unlock_irqrestore(&dma_chan_lock, flags);
|
|
return -EBUSY;
|
|
}
|
|
chan = dma_chan + free_ch;
|
|
chan->dev_id = dev_id;
|
|
clear_lch_regs(free_ch);
|
|
spin_unlock_irqrestore(&dma_chan_lock, flags);
|
|
|
|
chan->dev_id = dev_id;
|
|
chan->dev_name = dev_name;
|
|
chan->callback = callback;
|
|
chan->data = data;
|
|
chan->enabled_irqs = OMAP_DMA_TOUT_IRQ | OMAP_DMA_DROP_IRQ | OMAP_DMA_BLOCK_IRQ;
|
|
|
|
if (cpu_is_omap16xx()) {
|
|
/* If the sync device is set, configure it dynamically. */
|
|
if (dev_id != 0) {
|
|
set_gdma_dev(free_ch + 1, dev_id);
|
|
dev_id = free_ch + 1;
|
|
}
|
|
/* Disable the 1510 compatibility mode and set the sync device
|
|
* id. */
|
|
omap_writew(dev_id | (1 << 10), OMAP_DMA_CCR(free_ch));
|
|
} else {
|
|
omap_writew(dev_id, OMAP_DMA_CCR(free_ch));
|
|
}
|
|
*dma_ch_out = free_ch;
|
|
|
|
return 0;
|
|
}
|
|
|
|
void omap_free_dma(int ch)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&dma_chan_lock, flags);
|
|
if (dma_chan[ch].dev_id == -1) {
|
|
printk("omap_dma: trying to free nonallocated DMA channel %d\n", ch);
|
|
spin_unlock_irqrestore(&dma_chan_lock, flags);
|
|
return;
|
|
}
|
|
dma_chan[ch].dev_id = -1;
|
|
spin_unlock_irqrestore(&dma_chan_lock, flags);
|
|
|
|
/* Disable all DMA interrupts for the channel. */
|
|
omap_writew(0, OMAP_DMA_CICR(ch));
|
|
/* Make sure the DMA transfer is stopped. */
|
|
omap_writew(0, OMAP_DMA_CCR(ch));
|
|
}
|
|
|
|
int omap_dma_in_1510_mode(void)
|
|
{
|
|
return enable_1510_mode;
|
|
}
|
|
|
|
/*
|
|
* lch_queue DMA will start right after lch_head one is finished.
|
|
* For this DMA link to start, you still need to start (see omap_start_dma)
|
|
* the first one. That will fire up the entire queue.
|
|
*/
|
|
void omap_dma_link_lch (int lch_head, int lch_queue)
|
|
{
|
|
if (omap_dma_in_1510_mode()) {
|
|
printk(KERN_ERR "DMA linking is not supported in 1510 mode\n");
|
|
BUG();
|
|
return;
|
|
}
|
|
|
|
if ((dma_chan[lch_head].dev_id == -1) ||
|
|
(dma_chan[lch_queue].dev_id == -1)) {
|
|
printk(KERN_ERR "omap_dma: trying to link non requested channels\n");
|
|
dump_stack();
|
|
}
|
|
|
|
dma_chan[lch_head].next_lch = lch_queue;
|
|
}
|
|
|
|
/*
|
|
* Once the DMA queue is stopped, we can destroy it.
|
|
*/
|
|
void omap_dma_unlink_lch (int lch_head, int lch_queue)
|
|
{
|
|
if (omap_dma_in_1510_mode()) {
|
|
printk(KERN_ERR "DMA linking is not supported in 1510 mode\n");
|
|
BUG();
|
|
return;
|
|
}
|
|
|
|
if (dma_chan[lch_head].next_lch != lch_queue ||
|
|
dma_chan[lch_head].next_lch == -1) {
|
|
printk(KERN_ERR "omap_dma: trying to unlink non linked channels\n");
|
|
dump_stack();
|
|
}
|
|
|
|
|
|
if ((dma_chan[lch_head].flags & OMAP_DMA_ACTIVE) ||
|
|
(dma_chan[lch_head].flags & OMAP_DMA_ACTIVE)) {
|
|
printk(KERN_ERR "omap_dma: You need to stop the DMA channels before unlinking\n");
|
|
dump_stack();
|
|
}
|
|
|
|
dma_chan[lch_head].next_lch = -1;
|
|
}
|
|
|
|
|
|
static struct lcd_dma_info {
|
|
spinlock_t lock;
|
|
int reserved;
|
|
void (* callback)(u16 status, void *data);
|
|
void *cb_data;
|
|
|
|
int active;
|
|
unsigned long addr, size;
|
|
int rotate, data_type, xres, yres;
|
|
int vxres;
|
|
int mirror;
|
|
int xscale, yscale;
|
|
int ext_ctrl;
|
|
int src_port;
|
|
int single_transfer;
|
|
} lcd_dma;
|
|
|
|
void omap_set_lcd_dma_b1(unsigned long addr, u16 fb_xres, u16 fb_yres,
|
|
int data_type)
|
|
{
|
|
lcd_dma.addr = addr;
|
|
lcd_dma.data_type = data_type;
|
|
lcd_dma.xres = fb_xres;
|
|
lcd_dma.yres = fb_yres;
|
|
}
|
|
|
|
void omap_set_lcd_dma_src_port(int port)
|
|
{
|
|
lcd_dma.src_port = port;
|
|
}
|
|
|
|
void omap_set_lcd_dma_ext_controller(int external)
|
|
{
|
|
lcd_dma.ext_ctrl = external;
|
|
}
|
|
|
|
void omap_set_lcd_dma_single_transfer(int single)
|
|
{
|
|
lcd_dma.single_transfer = single;
|
|
}
|
|
|
|
|
|
void omap_set_lcd_dma_b1_rotation(int rotate)
|
|
{
|
|
if (omap_dma_in_1510_mode()) {
|
|
printk(KERN_ERR "DMA rotation is not supported in 1510 mode\n");
|
|
BUG();
|
|
return;
|
|
}
|
|
lcd_dma.rotate = rotate;
|
|
}
|
|
|
|
void omap_set_lcd_dma_b1_mirror(int mirror)
|
|
{
|
|
if (omap_dma_in_1510_mode()) {
|
|
printk(KERN_ERR "DMA mirror is not supported in 1510 mode\n");
|
|
BUG();
|
|
}
|
|
lcd_dma.mirror = mirror;
|
|
}
|
|
|
|
void omap_set_lcd_dma_b1_vxres(unsigned long vxres)
|
|
{
|
|
if (omap_dma_in_1510_mode()) {
|
|
printk(KERN_ERR "DMA virtual resulotion is not supported "
|
|
"in 1510 mode\n");
|
|
BUG();
|
|
}
|
|
lcd_dma.vxres = vxres;
|
|
}
|
|
|
|
void omap_set_lcd_dma_b1_scale(unsigned int xscale, unsigned int yscale)
|
|
{
|
|
if (omap_dma_in_1510_mode()) {
|
|
printk(KERN_ERR "DMA scale is not supported in 1510 mode\n");
|
|
BUG();
|
|
}
|
|
lcd_dma.xscale = xscale;
|
|
lcd_dma.yscale = yscale;
|
|
}
|
|
|
|
static void set_b1_regs(void)
|
|
{
|
|
unsigned long top, bottom;
|
|
int es;
|
|
u16 w;
|
|
unsigned long en, fn;
|
|
long ei, fi;
|
|
unsigned long vxres;
|
|
unsigned int xscale, yscale;
|
|
|
|
switch (lcd_dma.data_type) {
|
|
case OMAP_DMA_DATA_TYPE_S8:
|
|
es = 1;
|
|
break;
|
|
case OMAP_DMA_DATA_TYPE_S16:
|
|
es = 2;
|
|
break;
|
|
case OMAP_DMA_DATA_TYPE_S32:
|
|
es = 4;
|
|
break;
|
|
default:
|
|
BUG();
|
|
return;
|
|
}
|
|
|
|
vxres = lcd_dma.vxres ? lcd_dma.vxres : lcd_dma.xres;
|
|
xscale = lcd_dma.xscale ? lcd_dma.xscale : 1;
|
|
yscale = lcd_dma.yscale ? lcd_dma.yscale : 1;
|
|
BUG_ON(vxres < lcd_dma.xres);
|
|
#define PIXADDR(x,y) (lcd_dma.addr + ((y) * vxres * yscale + (x) * xscale) * es)
|
|
#define PIXSTEP(sx, sy, dx, dy) (PIXADDR(dx, dy) - PIXADDR(sx, sy) - es + 1)
|
|
switch (lcd_dma.rotate) {
|
|
case 0:
|
|
if (!lcd_dma.mirror) {
|
|
top = PIXADDR(0, 0);
|
|
bottom = PIXADDR(lcd_dma.xres - 1, lcd_dma.yres - 1);
|
|
/* 1510 DMA requires the bottom address to be 2 more
|
|
* than the actual last memory access location. */
|
|
if (omap_dma_in_1510_mode() &&
|
|
lcd_dma.data_type == OMAP_DMA_DATA_TYPE_S32)
|
|
bottom += 2;
|
|
ei = PIXSTEP(0, 0, 1, 0);
|
|
fi = PIXSTEP(lcd_dma.xres - 1, 0, 0, 1);
|
|
} else {
|
|
top = PIXADDR(lcd_dma.xres - 1, 0);
|
|
bottom = PIXADDR(0, lcd_dma.yres - 1);
|
|
ei = PIXSTEP(1, 0, 0, 0);
|
|
fi = PIXSTEP(0, 0, lcd_dma.xres - 1, 1);
|
|
}
|
|
en = lcd_dma.xres;
|
|
fn = lcd_dma.yres;
|
|
break;
|
|
case 90:
|
|
if (!lcd_dma.mirror) {
|
|
top = PIXADDR(0, lcd_dma.yres - 1);
|
|
bottom = PIXADDR(lcd_dma.xres - 1, 0);
|
|
ei = PIXSTEP(0, 1, 0, 0);
|
|
fi = PIXSTEP(0, 0, 1, lcd_dma.yres - 1);
|
|
} else {
|
|
top = PIXADDR(lcd_dma.xres - 1, lcd_dma.yres - 1);
|
|
bottom = PIXADDR(0, 0);
|
|
ei = PIXSTEP(0, 1, 0, 0);
|
|
fi = PIXSTEP(1, 0, 0, lcd_dma.yres - 1);
|
|
}
|
|
en = lcd_dma.yres;
|
|
fn = lcd_dma.xres;
|
|
break;
|
|
case 180:
|
|
if (!lcd_dma.mirror) {
|
|
top = PIXADDR(lcd_dma.xres - 1, lcd_dma.yres - 1);
|
|
bottom = PIXADDR(0, 0);
|
|
ei = PIXSTEP(1, 0, 0, 0);
|
|
fi = PIXSTEP(0, 1, lcd_dma.xres - 1, 0);
|
|
} else {
|
|
top = PIXADDR(0, lcd_dma.yres - 1);
|
|
bottom = PIXADDR(lcd_dma.xres - 1, 0);
|
|
ei = PIXSTEP(0, 0, 1, 0);
|
|
fi = PIXSTEP(lcd_dma.xres - 1, 1, 0, 0);
|
|
}
|
|
en = lcd_dma.xres;
|
|
fn = lcd_dma.yres;
|
|
break;
|
|
case 270:
|
|
if (!lcd_dma.mirror) {
|
|
top = PIXADDR(lcd_dma.xres - 1, 0);
|
|
bottom = PIXADDR(0, lcd_dma.yres - 1);
|
|
ei = PIXSTEP(0, 0, 0, 1);
|
|
fi = PIXSTEP(1, lcd_dma.yres - 1, 0, 0);
|
|
} else {
|
|
top = PIXADDR(0, 0);
|
|
bottom = PIXADDR(lcd_dma.xres - 1, lcd_dma.yres - 1);
|
|
ei = PIXSTEP(0, 0, 0, 1);
|
|
fi = PIXSTEP(0, lcd_dma.yres - 1, 1, 0);
|
|
}
|
|
en = lcd_dma.yres;
|
|
fn = lcd_dma.xres;
|
|
break;
|
|
default:
|
|
BUG();
|
|
return; /* Supress warning about uninitialized vars */
|
|
}
|
|
|
|
if (omap_dma_in_1510_mode()) {
|
|
omap_writew(top >> 16, OMAP1510_DMA_LCD_TOP_F1_U);
|
|
omap_writew(top, OMAP1510_DMA_LCD_TOP_F1_L);
|
|
omap_writew(bottom >> 16, OMAP1510_DMA_LCD_BOT_F1_U);
|
|
omap_writew(bottom, OMAP1510_DMA_LCD_BOT_F1_L);
|
|
|
|
return;
|
|
}
|
|
|
|
/* 1610 regs */
|
|
omap_writew(top >> 16, OMAP1610_DMA_LCD_TOP_B1_U);
|
|
omap_writew(top, OMAP1610_DMA_LCD_TOP_B1_L);
|
|
omap_writew(bottom >> 16, OMAP1610_DMA_LCD_BOT_B1_U);
|
|
omap_writew(bottom, OMAP1610_DMA_LCD_BOT_B1_L);
|
|
|
|
omap_writew(en, OMAP1610_DMA_LCD_SRC_EN_B1);
|
|
omap_writew(fn, OMAP1610_DMA_LCD_SRC_FN_B1);
|
|
|
|
w = omap_readw(OMAP1610_DMA_LCD_CSDP);
|
|
w &= ~0x03;
|
|
w |= lcd_dma.data_type;
|
|
omap_writew(w, OMAP1610_DMA_LCD_CSDP);
|
|
|
|
w = omap_readw(OMAP1610_DMA_LCD_CTRL);
|
|
/* Always set the source port as SDRAM for now*/
|
|
w &= ~(0x03 << 6);
|
|
if (lcd_dma.ext_ctrl)
|
|
w |= 1 << 8;
|
|
else
|
|
w &= ~(1 << 8);
|
|
if (lcd_dma.callback != NULL)
|
|
w |= 1 << 1; /* Block interrupt enable */
|
|
else
|
|
w &= ~(1 << 1);
|
|
omap_writew(w, OMAP1610_DMA_LCD_CTRL);
|
|
|
|
if (!(lcd_dma.rotate || lcd_dma.mirror ||
|
|
lcd_dma.vxres || lcd_dma.xscale || lcd_dma.yscale))
|
|
return;
|
|
|
|
w = omap_readw(OMAP1610_DMA_LCD_CCR);
|
|
/* Set the double-indexed addressing mode */
|
|
w |= (0x03 << 12);
|
|
omap_writew(w, OMAP1610_DMA_LCD_CCR);
|
|
|
|
omap_writew(ei, OMAP1610_DMA_LCD_SRC_EI_B1);
|
|
omap_writew(fi >> 16, OMAP1610_DMA_LCD_SRC_FI_B1_U);
|
|
omap_writew(fi, OMAP1610_DMA_LCD_SRC_FI_B1_L);
|
|
}
|
|
|
|
static irqreturn_t lcd_dma_irq_handler(int irq, void *dev_id, struct pt_regs *regs)
|
|
{
|
|
u16 w;
|
|
|
|
w = omap_readw(OMAP1610_DMA_LCD_CTRL);
|
|
if (unlikely(!(w & (1 << 3)))) {
|
|
printk(KERN_WARNING "Spurious LCD DMA IRQ\n");
|
|
return IRQ_NONE;
|
|
}
|
|
/* Ack the IRQ */
|
|
w |= (1 << 3);
|
|
omap_writew(w, OMAP1610_DMA_LCD_CTRL);
|
|
lcd_dma.active = 0;
|
|
if (lcd_dma.callback != NULL)
|
|
lcd_dma.callback(w, lcd_dma.cb_data);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
int omap_request_lcd_dma(void (* callback)(u16 status, void *data),
|
|
void *data)
|
|
{
|
|
spin_lock_irq(&lcd_dma.lock);
|
|
if (lcd_dma.reserved) {
|
|
spin_unlock_irq(&lcd_dma.lock);
|
|
printk(KERN_ERR "LCD DMA channel already reserved\n");
|
|
BUG();
|
|
return -EBUSY;
|
|
}
|
|
lcd_dma.reserved = 1;
|
|
spin_unlock_irq(&lcd_dma.lock);
|
|
lcd_dma.callback = callback;
|
|
lcd_dma.cb_data = data;
|
|
lcd_dma.active = 0;
|
|
lcd_dma.single_transfer = 0;
|
|
lcd_dma.rotate = 0;
|
|
lcd_dma.vxres = 0;
|
|
lcd_dma.mirror = 0;
|
|
lcd_dma.xscale = 0;
|
|
lcd_dma.yscale = 0;
|
|
lcd_dma.ext_ctrl = 0;
|
|
lcd_dma.src_port = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
void omap_free_lcd_dma(void)
|
|
{
|
|
spin_lock(&lcd_dma.lock);
|
|
if (!lcd_dma.reserved) {
|
|
spin_unlock(&lcd_dma.lock);
|
|
printk(KERN_ERR "LCD DMA is not reserved\n");
|
|
BUG();
|
|
return;
|
|
}
|
|
if (!enable_1510_mode)
|
|
omap_writew(omap_readw(OMAP1610_DMA_LCD_CCR) & ~1, OMAP1610_DMA_LCD_CCR);
|
|
lcd_dma.reserved = 0;
|
|
spin_unlock(&lcd_dma.lock);
|
|
}
|
|
|
|
void omap_enable_lcd_dma(void)
|
|
{
|
|
u16 w;
|
|
|
|
/* Set the Enable bit only if an external controller is
|
|
* connected. Otherwise the OMAP internal controller will
|
|
* start the transfer when it gets enabled.
|
|
*/
|
|
if (enable_1510_mode || !lcd_dma.ext_ctrl)
|
|
return;
|
|
w = omap_readw(OMAP1610_DMA_LCD_CCR);
|
|
w |= 1 << 7;
|
|
omap_writew(w, OMAP1610_DMA_LCD_CCR);
|
|
lcd_dma.active = 1;
|
|
}
|
|
|
|
void omap_setup_lcd_dma(void)
|
|
{
|
|
BUG_ON(lcd_dma.active);
|
|
if (!enable_1510_mode) {
|
|
/* Set some reasonable defaults */
|
|
omap_writew(0x5440, OMAP1610_DMA_LCD_CCR);
|
|
omap_writew(0x9102, OMAP1610_DMA_LCD_CSDP);
|
|
omap_writew(0x0004, OMAP1610_DMA_LCD_LCH_CTRL);
|
|
}
|
|
set_b1_regs();
|
|
if (!enable_1510_mode) {
|
|
u16 w;
|
|
|
|
w = omap_readw(OMAP1610_DMA_LCD_CCR);
|
|
/* If DMA was already active set the end_prog bit to have
|
|
* the programmed register set loaded into the active
|
|
* register set.
|
|
*/
|
|
w |= 1 << 11; /* End_prog */
|
|
if (!lcd_dma.single_transfer)
|
|
w |= (3 << 8); /* Auto_init, repeat */
|
|
omap_writew(w, OMAP1610_DMA_LCD_CCR);
|
|
}
|
|
}
|
|
|
|
void omap_stop_lcd_dma(void)
|
|
{
|
|
lcd_dma.active = 0;
|
|
if (!enable_1510_mode && lcd_dma.ext_ctrl)
|
|
omap_writew(omap_readw(OMAP1610_DMA_LCD_CCR) & ~(1 << 7),
|
|
OMAP1610_DMA_LCD_CCR);
|
|
}
|
|
|
|
/*
|
|
* Clears any DMA state so the DMA engine is ready to restart with new buffers
|
|
* through omap_start_dma(). Any buffers in flight are discarded.
|
|
*/
|
|
void omap_clear_dma(int lch)
|
|
{
|
|
unsigned long flags;
|
|
int status;
|
|
|
|
local_irq_save(flags);
|
|
omap_writew(omap_readw(OMAP_DMA_CCR(lch)) & ~OMAP_DMA_CCR_EN,
|
|
OMAP_DMA_CCR(lch));
|
|
status = OMAP_DMA_CSR(lch); /* clear pending interrupts */
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
/*
|
|
* Returns current physical source address for the given DMA channel.
|
|
* If the channel is running the caller must disable interrupts prior calling
|
|
* this function and process the returned value before re-enabling interrupt to
|
|
* prevent races with the interrupt handler. Note that in continuous mode there
|
|
* is a chance for CSSA_L register overflow inbetween the two reads resulting
|
|
* in incorrect return value.
|
|
*/
|
|
dma_addr_t omap_get_dma_src_pos(int lch)
|
|
{
|
|
return (dma_addr_t) (OMAP_DMA_CSSA_L(lch) |
|
|
(OMAP_DMA_CSSA_U(lch) << 16));
|
|
}
|
|
|
|
/*
|
|
* Returns current physical destination address for the given DMA channel.
|
|
* If the channel is running the caller must disable interrupts prior calling
|
|
* this function and process the returned value before re-enabling interrupt to
|
|
* prevent races with the interrupt handler. Note that in continuous mode there
|
|
* is a chance for CDSA_L register overflow inbetween the two reads resulting
|
|
* in incorrect return value.
|
|
*/
|
|
dma_addr_t omap_get_dma_dst_pos(int lch)
|
|
{
|
|
return (dma_addr_t) (OMAP_DMA_CDSA_L(lch) |
|
|
(OMAP_DMA_CDSA_U(lch) << 16));
|
|
}
|
|
|
|
static int __init omap_init_dma(void)
|
|
{
|
|
int ch, r;
|
|
|
|
if (cpu_is_omap1510()) {
|
|
printk(KERN_INFO "DMA support for OMAP1510 initialized\n");
|
|
dma_chan_count = 9;
|
|
enable_1510_mode = 1;
|
|
} else if (cpu_is_omap16xx() || cpu_is_omap730()) {
|
|
printk(KERN_INFO "OMAP DMA hardware version %d\n",
|
|
omap_readw(OMAP_DMA_HW_ID));
|
|
printk(KERN_INFO "DMA capabilities: %08x:%08x:%04x:%04x:%04x\n",
|
|
(omap_readw(OMAP_DMA_CAPS_0_U) << 16) | omap_readw(OMAP_DMA_CAPS_0_L),
|
|
(omap_readw(OMAP_DMA_CAPS_1_U) << 16) | omap_readw(OMAP_DMA_CAPS_1_L),
|
|
omap_readw(OMAP_DMA_CAPS_2), omap_readw(OMAP_DMA_CAPS_3),
|
|
omap_readw(OMAP_DMA_CAPS_4));
|
|
if (!enable_1510_mode) {
|
|
u16 w;
|
|
|
|
/* Disable OMAP 3.0/3.1 compatibility mode. */
|
|
w = omap_readw(OMAP_DMA_GSCR);
|
|
w |= 1 << 3;
|
|
omap_writew(w, OMAP_DMA_GSCR);
|
|
dma_chan_count = 16;
|
|
} else
|
|
dma_chan_count = 9;
|
|
} else {
|
|
dma_chan_count = 0;
|
|
return 0;
|
|
}
|
|
|
|
memset(&lcd_dma, 0, sizeof(lcd_dma));
|
|
spin_lock_init(&lcd_dma.lock);
|
|
spin_lock_init(&dma_chan_lock);
|
|
memset(&dma_chan, 0, sizeof(dma_chan));
|
|
|
|
for (ch = 0; ch < dma_chan_count; ch++) {
|
|
dma_chan[ch].dev_id = -1;
|
|
dma_chan[ch].next_lch = -1;
|
|
|
|
if (ch >= 6 && enable_1510_mode)
|
|
continue;
|
|
|
|
/* request_irq() doesn't like dev_id (ie. ch) being zero,
|
|
* so we have to kludge around this. */
|
|
r = request_irq(dma_irq[ch], dma_irq_handler, 0, "DMA",
|
|
(void *) (ch + 1));
|
|
if (r != 0) {
|
|
int i;
|
|
|
|
printk(KERN_ERR "unable to request IRQ %d for DMA (error %d)\n",
|
|
dma_irq[ch], r);
|
|
for (i = 0; i < ch; i++)
|
|
free_irq(dma_irq[i], (void *) (i + 1));
|
|
return r;
|
|
}
|
|
}
|
|
r = request_irq(INT_DMA_LCD, lcd_dma_irq_handler, 0, "LCD DMA", NULL);
|
|
if (r != 0) {
|
|
int i;
|
|
|
|
printk(KERN_ERR "unable to request IRQ for LCD DMA (error %d)\n", r);
|
|
for (i = 0; i < dma_chan_count; i++)
|
|
free_irq(dma_irq[i], (void *) (i + 1));
|
|
return r;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
arch_initcall(omap_init_dma);
|
|
|
|
|
|
EXPORT_SYMBOL(omap_get_dma_src_pos);
|
|
EXPORT_SYMBOL(omap_get_dma_dst_pos);
|
|
EXPORT_SYMBOL(omap_clear_dma);
|
|
EXPORT_SYMBOL(omap_set_dma_priority);
|
|
EXPORT_SYMBOL(omap_request_dma);
|
|
EXPORT_SYMBOL(omap_free_dma);
|
|
EXPORT_SYMBOL(omap_start_dma);
|
|
EXPORT_SYMBOL(omap_stop_dma);
|
|
EXPORT_SYMBOL(omap_enable_dma_irq);
|
|
EXPORT_SYMBOL(omap_disable_dma_irq);
|
|
|
|
EXPORT_SYMBOL(omap_set_dma_transfer_params);
|
|
EXPORT_SYMBOL(omap_set_dma_color_mode);
|
|
|
|
EXPORT_SYMBOL(omap_set_dma_src_params);
|
|
EXPORT_SYMBOL(omap_set_dma_src_index);
|
|
EXPORT_SYMBOL(omap_set_dma_src_data_pack);
|
|
EXPORT_SYMBOL(omap_set_dma_src_burst_mode);
|
|
|
|
EXPORT_SYMBOL(omap_set_dma_dest_params);
|
|
EXPORT_SYMBOL(omap_set_dma_dest_index);
|
|
EXPORT_SYMBOL(omap_set_dma_dest_data_pack);
|
|
EXPORT_SYMBOL(omap_set_dma_dest_burst_mode);
|
|
|
|
EXPORT_SYMBOL(omap_dma_link_lch);
|
|
EXPORT_SYMBOL(omap_dma_unlink_lch);
|
|
|
|
EXPORT_SYMBOL(omap_request_lcd_dma);
|
|
EXPORT_SYMBOL(omap_free_lcd_dma);
|
|
EXPORT_SYMBOL(omap_enable_lcd_dma);
|
|
EXPORT_SYMBOL(omap_setup_lcd_dma);
|
|
EXPORT_SYMBOL(omap_stop_lcd_dma);
|
|
EXPORT_SYMBOL(omap_set_lcd_dma_b1);
|
|
EXPORT_SYMBOL(omap_set_lcd_dma_single_transfer);
|
|
EXPORT_SYMBOL(omap_set_lcd_dma_ext_controller);
|
|
EXPORT_SYMBOL(omap_set_lcd_dma_b1_rotation);
|
|
EXPORT_SYMBOL(omap_set_lcd_dma_b1_vxres);
|
|
EXPORT_SYMBOL(omap_set_lcd_dma_b1_scale);
|
|
EXPORT_SYMBOL(omap_set_lcd_dma_b1_mirror);
|
|
|