--- /dev/null
+/*
+ * linux/arch/arm/mach-omap1/lcd_dma.c
+ *
+ * Extracted from arch/arm/plat-omap/dma.c
+ * Copyright (C) 2003 - 2008 Nokia Corporation
+ * Author: Juha Yrjölä <juha.yrjola@nokia.com>
+ * DMA channel linking for 1610 by Samuel Ortiz <samuel.ortiz@nokia.com>
+ * Graphics DMA and LCD DMA graphics tranformations
+ * by Imre Deak <imre.deak@nokia.com>
+ * OMAP2/3 support Copyright (C) 2004-2007 Texas Instruments, Inc.
+ * Merged to support both OMAP1 and OMAP2 by Tony Lindgren <tony@atomide.com>
+ * Some functions based on earlier dma-omap.c Copyright (C) 2001 RidgeRun, Inc.
+ *
+ * Copyright (C) 2009 Texas Instruments
+ * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
+ *
+ * Support functions for the OMAP internal DMA channels.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/spinlock.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+
+#include <linux/omap-dma.h>
+
+#include <mach/hardware.h>
+#include <mach/lcdc.h>
+
+int omap_lcd_dma_running(void)
+{
+ /*
+ * On OMAP1510, internal LCD controller will start the transfer
+ * when it gets enabled, so assume DMA running if LCD enabled.
+ */
+ if (cpu_is_omap15xx())
+ if (omap_readw(OMAP_LCDC_CONTROL) & OMAP_LCDC_CTRL_LCD_EN)
+ return 1;
+
+ /* Check if LCD DMA is running */
+ if (cpu_is_omap16xx())
+ if (omap_readw(OMAP1610_DMA_LCD_CCR) & OMAP_DMA_CCR_EN)
+ return 1;
+
+ return 0;
+}
+
+static struct lcd_dma_info {
+ spinlock_t lock;
+ int reserved;
+ void (*callback)(u16 status, void *data);
+ void *cb_data;
+
+ int active;
+ unsigned long addr;
+ 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;
+}
+EXPORT_SYMBOL(omap_set_lcd_dma_b1);
+
+void omap_set_lcd_dma_ext_controller(int external)
+{
+ lcd_dma.ext_ctrl = external;
+}
+EXPORT_SYMBOL(omap_set_lcd_dma_ext_controller);
+
+void omap_set_lcd_dma_single_transfer(int single)
+{
+ lcd_dma.single_transfer = single;
+}
+EXPORT_SYMBOL(omap_set_lcd_dma_single_transfer);
+
+void omap_set_lcd_dma_b1_rotation(int rotate)
+{
+ if (cpu_is_omap15xx()) {
+ printk(KERN_ERR "DMA rotation is not supported in 1510 mode\n");
+ BUG();
+ return;
+ }
+ lcd_dma.rotate = rotate;
+}
+EXPORT_SYMBOL(omap_set_lcd_dma_b1_rotation);
+
+void omap_set_lcd_dma_b1_mirror(int mirror)
+{
+ if (cpu_is_omap15xx()) {
+ printk(KERN_ERR "DMA mirror is not supported in 1510 mode\n");
+ BUG();
+ }
+ lcd_dma.mirror = mirror;
+}
+EXPORT_SYMBOL(omap_set_lcd_dma_b1_mirror);
+
+void omap_set_lcd_dma_b1_vxres(unsigned long vxres)
+{
+ if (cpu_is_omap15xx()) {
+ pr_err("DMA virtual resolution is not supported in 1510 mode\n");
+ BUG();
+ }
+ lcd_dma.vxres = vxres;
+}
+EXPORT_SYMBOL(omap_set_lcd_dma_b1_vxres);
+
+void omap_set_lcd_dma_b1_scale(unsigned int xscale, unsigned int yscale)
+{
+ if (cpu_is_omap15xx()) {
+ printk(KERN_ERR "DMA scale is not supported in 1510 mode\n");
+ BUG();
+ }
+ lcd_dma.xscale = xscale;
+ lcd_dma.yscale = yscale;
+}
+EXPORT_SYMBOL(omap_set_lcd_dma_b1_scale);
+
+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 (cpu_is_omap15xx() &&
+ 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 (cpu_is_omap15xx()) {
+ 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;
+}
+EXPORT_SYMBOL(omap_request_lcd_dma);
+
+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 (!cpu_is_omap15xx())
+ omap_writew(omap_readw(OMAP1610_DMA_LCD_CCR) & ~1,
+ OMAP1610_DMA_LCD_CCR);
+ lcd_dma.reserved = 0;
+ spin_unlock(&lcd_dma.lock);
+}
+EXPORT_SYMBOL(omap_free_lcd_dma);
+
+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 (cpu_is_omap15xx() || !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);
+}
+EXPORT_SYMBOL(omap_enable_lcd_dma);
+
+void omap_setup_lcd_dma(void)
+{
+ BUG_ON(lcd_dma.active);
+ if (!cpu_is_omap15xx()) {
+ /* 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 (!cpu_is_omap15xx()) {
+ 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);
+ }
+}
+EXPORT_SYMBOL(omap_setup_lcd_dma);
+
+void omap_stop_lcd_dma(void)
+{
+ u16 w;
+
+ lcd_dma.active = 0;
+ if (cpu_is_omap15xx() || !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);
+}
+EXPORT_SYMBOL(omap_stop_lcd_dma);
+
+static int __init omap_init_lcd_dma(void)
+{
+ int r;
+
+ if (!cpu_class_is_omap1())
+ return -ENODEV;
+
+ 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);
+ }
+
+ spin_lock_init(&lcd_dma.lock);
+
+ r = request_irq(INT_DMA_LCD, lcd_dma_irq_handler, 0,
+ "LCD DMA", NULL);
+ if (r != 0)
+ pr_err("unable to request IRQ for LCD DMA (error %d)\n", r);
+
+ return r;
+}
+
+arch_initcall(omap_init_lcd_dma);
+
Code Review / kvmfornfv.git / blobdiff