/* * 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> #include "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_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);