From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Wed, 5 Aug 2015 17:04:01 -0300 Subject: Initial import --- arch/arm/mach-omap1/lcd_dma.c | 445 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 445 insertions(+) create mode 100644 arch/arm/mach-omap1/lcd_dma.c (limited to 'arch/arm/mach-omap1/lcd_dma.c') diff --git a/arch/arm/mach-omap1/lcd_dma.c b/arch/arm/mach-omap1/lcd_dma.c new file mode 100644 index 000000000..26a2b01c7 --- /dev/null +++ b/arch/arm/mach-omap1/lcd_dma.c @@ -0,0 +1,445 @@ +/* + * 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 + * DMA channel linking for 1610 by Samuel Ortiz + * Graphics DMA and LCD DMA graphics tranformations + * by Imre Deak + * OMAP2/3 support Copyright (C) 2004-2007 Texas Instruments, Inc. + * Merged to support both OMAP1 and OMAP2 by Tony Lindgren + * Some functions based on earlier dma-omap.c Copyright (C) 2001 RidgeRun, Inc. + * + * Copyright (C) 2009 Texas Instruments + * Added OMAP4 support - Santosh Shilimkar + * + * 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 +#include +#include +#include + +#include + +#include +#include + +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); + -- cgit v1.2.3-54-g00ecf