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lcd_dma.c

/*
 * 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 <mach/hardware.h>
#include <mach/lcdc.h>
#include <plat/dma.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_omap1510())
            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;
}

00052 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;
}
EXPORT_SYMBOL(omap_set_lcd_dma_b1);

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;
}
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_omap1510()) {
            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_omap1510()) {
            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_omap1510()) {
            printk(KERN_ERR "DMA virtual resulotion 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_omap1510()) {
            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_omap1510() &&
                        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_omap1510()) {
            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_omap1510())
            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_omap1510() || !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_omap1510()) {
            /* 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_omap1510()) {
            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_omap1510() || !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)
            printk(KERN_ERR "unable to request IRQ for LCD DMA "
                         "(error %d)\n", r);

      return r;
}

arch_initcall(omap_init_lcd_dma);


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