dma.c

linux 内核源代码

	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;	/* Suppress 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.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)
{
	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_CTRL);
	w |= 1 << 8;
	omap_writew(w, OMAP1610_DMA_LCD_CTRL);

	lcd_dma.active = 1;

	w = omap_readw(OMAP1610_DMA_LCD_CCR);
	w |= 1 << 7;
	omap_writew(w, OMAP1610_DMA_LCD_CCR);
}

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)
{
	u16 w;

	lcd_dma.active = 0;
	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);

	w = omap_readw(OMAP1610_DMA_LCD_CTRL);
	w &= ~(1 << 8);
	omap_writew(w, OMAP1610_DMA_LCD_CTRL);
}

/*----------------------------------------------------------------------------*/

static int __init omap_init_dma(void)
{
	int ch, r;

	if (cpu_is_omap15xx()) {
		printk(KERN_INFO "DMA support for OMAP15xx 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;
		if (cpu_is_omap16xx()) {
			u16 w;

			/* this would prevent OMAP sleep */
			w = omap_readw(OMAP1610_DMA_LCD_CTRL);
			w &= ~(1 << 8);
			omap_writew(w, OMAP1610_DMA_LCD_CTRL);
		}
	} else if (cpu_is_omap24xx()) {
		u8 revision = omap_readb(OMAP_DMA4_REVISION);
		printk(KERN_INFO "OMAP DMA hardware revision %d.%d\n",
		       revision >> 4, revision & 0xf);
		dma_chan_count = OMAP_LOGICAL_DMA_CH_COUNT;
	} 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++) {
		omap_clear_dma(ch);
		dma_chan[ch].dev_id = -1;
		dma_chan[ch].next_lch = -1;

		if (ch >= 6 && enable_1510_mode)
			continue;

		if (cpu_class_is_omap1()) {
			/* request_irq() doesn't like dev_id (ie. ch) being
			 * zero, so we have to kludge around this. */
			r = request_irq(omap1_dma_irq[ch],
					omap1_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",
				       omap1_dma_irq[ch], r);
				for (i = 0; i < ch; i++)
					free_irq(omap1_dma_irq[i],
						 (void *) (i + 1));
				return r;
			}
		}
	}

	if (cpu_is_omap24xx())
		setup_irq(INT_24XX_SDMA_IRQ0, &omap24xx_dma_irq);

	/* FIXME: Update LCD DMA to work on 24xx */
	if (cpu_class_is_omap1()) {
		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(omap1_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_get_dma_src_addr_counter);
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_set_dma_callback);
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_write_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_set_dma_params);

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);