/* * File: drivers/video/bfin-t350mcqb-fb.c * Based on: * Author: Michael Hennerich <hennerich@blackfin.uclinux.org> * * Created: * Description: Blackfin LCD Framebufer driver * * * Modified: * Copyright 2004-2007 Analog Devices Inc. * * Bugs: Enter bugs at http://blackfin.uclinux.org/ * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, see the file COPYING, or write * to the Free Software Foundation, Inc., * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ #include <linux/module.h> #include <linux/kernel.h> #include <linux/errno.h> #include <linux/string.h> #include <linux/fb.h> #include <linux/init.h> #include <linux/types.h> #include <linux/interrupt.h> #include <linux/device.h> #include <linux/backlight.h> #include <linux/lcd.h> #include <linux/dma-mapping.h> #include <linux/platform_device.h> #include <asm/blackfin.h> #include <asm/irq.h> #include <asm/dma-mapping.h> #include <asm/dma.h> #include <asm/portmux.h> #include <asm/gptimers.h> #define NO_BL_SUPPORT #define LCD_X_RES 320 /* Horizontal Resolution */ #define LCD_Y_RES 240 /* Vertical Resolution */ #define LCD_BPP 24 /* Bit Per Pixel */ #define DMA_BUS_SIZE 16 #define LCD_CLK (12*1000*1000) /* 12MHz */ #define CLOCKS_PER_PIX 3 /* * HS and VS timing parameters (all in number of PPI clk ticks) */ #define U_LINE 1 /* Blanking Lines */ #define H_ACTPIX (LCD_X_RES * CLOCKS_PER_PIX) /* active horizontal pixel */ #define H_PERIOD (408 * CLOCKS_PER_PIX) /* HS period */ #define H_PULSE 90 /* HS pulse width */ #define H_START 204 /* first valid pixel */ #define V_LINES (LCD_Y_RES + U_LINE) /* total vertical lines */ #define V_PULSE (3 * H_PERIOD) /* VS pulse width (1-5 H_PERIODs) */ #define V_PERIOD (H_PERIOD * V_LINES) /* VS period */ #define ACTIVE_VIDEO_MEM_OFFSET (U_LINE * H_ACTPIX) #define BFIN_LCD_NBR_PALETTE_ENTRIES 256 #define DRIVER_NAME "bfin-t350mcqb" static char driver_name[] = DRIVER_NAME; struct bfin_t350mcqbfb_info { struct fb_info *fb; struct device *dev; unsigned char *fb_buffer; /* RGB Buffer */ dma_addr_t dma_handle; int lq043_mmap; int lq043_open_cnt; int irq; spinlock_t lock; /* lock */ u32 pseudo_pal[16]; }; static int nocursor; module_param(nocursor, int, 0644); MODULE_PARM_DESC(nocursor, "cursor enable/disable"); #define PPI_TX_MODE 0x2 #define PPI_XFER_TYPE_11 0xC #define PPI_PORT_CFG_01 0x10 #define PPI_PACK_EN 0x80 #define PPI_POLS_1 0x8000 static void bfin_t350mcqb_config_ppi(struct bfin_t350mcqbfb_info *fbi) { bfin_write_PPI_DELAY(H_START); bfin_write_PPI_COUNT(H_ACTPIX-1); bfin_write_PPI_FRAME(V_LINES); bfin_write_PPI_CONTROL(PPI_TX_MODE | /* output mode , PORT_DIR */ PPI_XFER_TYPE_11 | /* sync mode XFR_TYPE */ PPI_PORT_CFG_01 | /* two frame sync PORT_CFG */ PPI_PACK_EN | /* packing enabled PACK_EN */ PPI_POLS_1); /* faling edge syncs POLS */ } static inline void bfin_t350mcqb_disable_ppi(void) { bfin_write_PPI_CONTROL(bfin_read_PPI_CONTROL() & ~PORT_EN); } static inline void bfin_t350mcqb_enable_ppi(void) { bfin_write_PPI_CONTROL(bfin_read_PPI_CONTROL() | PORT_EN); } static void bfin_t350mcqb_start_timers(void) { unsigned long flags; local_irq_save(flags); enable_gptimers(TIMER1bit); enable_gptimers(TIMER0bit); local_irq_restore(flags); } static void bfin_t350mcqb_stop_timers(void) { disable_gptimers(TIMER0bit | TIMER1bit); set_gptimer_status(0, TIMER_STATUS_TRUN0 | TIMER_STATUS_TRUN1 | TIMER_STATUS_TIMIL0 | TIMER_STATUS_TIMIL1 | TIMER_STATUS_TOVF0 | TIMER_STATUS_TOVF1); } static void bfin_t350mcqb_init_timers(void) { bfin_t350mcqb_stop_timers(); set_gptimer_period(TIMER0_id, H_PERIOD); set_gptimer_pwidth(TIMER0_id, H_PULSE); set_gptimer_config(TIMER0_id, TIMER_MODE_PWM | TIMER_PERIOD_CNT | TIMER_TIN_SEL | TIMER_CLK_SEL| TIMER_EMU_RUN); set_gptimer_period(TIMER1_id, V_PERIOD); set_gptimer_pwidth(TIMER1_id, V_PULSE); set_gptimer_config(TIMER1_id, TIMER_MODE_PWM | TIMER_PERIOD_CNT | TIMER_TIN_SEL | TIMER_CLK_SEL | TIMER_EMU_RUN); } static void bfin_t350mcqb_config_dma(struct bfin_t350mcqbfb_info *fbi) { set_dma_config(CH_PPI, set_bfin_dma_config(DIR_READ, DMA_FLOW_AUTO, INTR_DISABLE, DIMENSION_2D, DATA_SIZE_16, DMA_NOSYNC_KEEP_DMA_BUF)); set_dma_x_count(CH_PPI, (LCD_X_RES * LCD_BPP) / DMA_BUS_SIZE); set_dma_x_modify(CH_PPI, DMA_BUS_SIZE / 8); set_dma_y_count(CH_PPI, V_LINES); set_dma_y_modify(CH_PPI, DMA_BUS_SIZE / 8); set_dma_start_addr(CH_PPI, (unsigned long)fbi->fb_buffer); } static u16 ppi0_req_8[] = {P_PPI0_CLK, P_PPI0_FS1, P_PPI0_FS2, P_PPI0_D0, P_PPI0_D1, P_PPI0_D2, P_PPI0_D3, P_PPI0_D4, P_PPI0_D5, P_PPI0_D6, P_PPI0_D7, 0}; static int bfin_t350mcqb_request_ports(int action) { if (action) { if (peripheral_request_list(ppi0_req_8, DRIVER_NAME)) { printk(KERN_ERR "Requesting Peripherals faild\n"); return -EFAULT; } } else peripheral_free_list(ppi0_req_8); return 0; } static int bfin_t350mcqb_fb_open(struct fb_info *info, int user) { struct bfin_t350mcqbfb_info *fbi = info->par; spin_lock(&fbi->lock); fbi->lq043_open_cnt++; if (fbi->lq043_open_cnt <= 1) { bfin_t350mcqb_disable_ppi(); SSYNC(); bfin_t350mcqb_config_dma(fbi); bfin_t350mcqb_config_ppi(fbi); bfin_t350mcqb_init_timers(); /* start dma */ enable_dma(CH_PPI); bfin_t350mcqb_enable_ppi(); bfin_t350mcqb_start_timers(); } spin_unlock(&fbi->lock); return 0; } static int bfin_t350mcqb_fb_release(struct fb_info *info, int user) { struct bfin_t350mcqbfb_info *fbi = info->par; spin_lock(&fbi->lock); fbi->lq043_open_cnt--; fbi->lq043_mmap = 0; if (fbi->lq043_open_cnt <= 0) { bfin_t350mcqb_disable_ppi(); SSYNC(); disable_dma(CH_PPI); bfin_t350mcqb_stop_timers(); memset(fbi->fb_buffer, 0, info->fix.smem_len); } spin_unlock(&fbi->lock); return 0; } static int bfin_t350mcqb_fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info) { switch (var->bits_per_pixel) { case 24:/* TRUECOLOUR, 16m */ var->red.offset = 0; var->green.offset = 8; var->blue.offset = 16; var->red.length = var->green.length = var->blue.length = 8; var->transp.offset = 0; var->transp.length = 0; var->transp.msb_right = 0; var->red.msb_right = 0; var->green.msb_right = 0; var->blue.msb_right = 0; break; default: pr_debug("%s: depth not supported: %u BPP\n", __func__, var->bits_per_pixel); return -EINVAL; } if (info->var.xres != var->xres || info->var.yres != var->yres || info->var.xres_virtual != var->xres_virtual || info->var.yres_virtual != var->yres_virtual) { pr_debug("%s: Resolution not supported: X%u x Y%u \n", __func__, var->xres, var->yres); return -EINVAL; } /* * Memory limit */ if ((info->fix.line_length * var->yres_virtual) > info->fix.smem_len) { pr_debug("%s: Memory Limit requested yres_virtual = %u\n", __func__, var->yres_virtual); return -ENOMEM; } return 0; } static int bfin_t350mcqb_fb_mmap(struct fb_info *info, struct vm_area_struct *vma) { struct bfin_t350mcqbfb_info *fbi = info->par; if (fbi->lq043_mmap) return -1; spin_lock(&fbi->lock); fbi->lq043_mmap = 1; spin_unlock(&fbi->lock); vma->vm_start = (unsigned long)(fbi->fb_buffer + ACTIVE_VIDEO_MEM_OFFSET); vma->vm_end = vma->vm_start + info->fix.smem_len; /* For those who don't understand how mmap works, go read * Documentation/nommu-mmap.txt. * For those that do, you will know that the VM_MAYSHARE flag * must be set in the vma->vm_flags structure on noMMU * Other flags can be set, and are documented in * include/linux/mm.h */ vma->vm_flags |= VM_MAYSHARE | VM_SHARED; return 0; } int bfin_t350mcqb_fb_cursor(struct fb_info *info, struct fb_cursor *cursor) { if (nocursor) return 0; else return -EINVAL; /* just to force soft_cursor() call */ } static int bfin_t350mcqb_fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue, u_int transp, struct fb_info *info) { if (regno >= BFIN_LCD_NBR_PALETTE_ENTRIES) return -EINVAL; if (info->var.grayscale) { /* grayscale = 0.30*R + 0.59*G + 0.11*B */ red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8; } if (info->fix.visual == FB_VISUAL_TRUECOLOR) { u32 value; /* Place color in the pseudopalette */ if (regno > 16) return -EINVAL; red >>= (16 - info->var.red.length); green >>= (16 - info->var.green.length); blue >>= (16 - info->var.blue.length); value = (red << info->var.red.offset) | (green << info->var.green.offset) | (blue << info->var.blue.offset); value &= 0xFFFFFF; ((u32 *) (info->pseudo_palette))[regno] = value; } return 0; } static struct fb_ops bfin_t350mcqb_fb_ops = { .owner = THIS_MODULE, .fb_open = bfin_t350mcqb_fb_open, .fb_release = bfin_t350mcqb_fb_release, .fb_check_var = bfin_t350mcqb_fb_check_var, .fb_fillrect = cfb_fillrect, .fb_copyarea = cfb_copyarea, .fb_imageblit = cfb_imageblit, .fb_mmap = bfin_t350mcqb_fb_mmap, .fb_cursor = bfin_t350mcqb_fb_cursor, .fb_setcolreg = bfin_t350mcqb_fb_setcolreg, }; #ifndef NO_BL_SUPPORT static int bl_get_brightness(struct backlight_device *bd) { return 0; } static struct backlight_ops bfin_lq043fb_bl_ops = { .get_brightness = bl_get_brightness, }; static struct backlight_device *bl_dev; static int bfin_lcd_get_power(struct lcd_device *dev) { return 0; } static int bfin_lcd_set_power(struct lcd_device *dev, int power) { return 0; } static int bfin_lcd_get_contrast(struct lcd_device *dev) { return 0; } static int bfin_lcd_set_contrast(struct lcd_device *dev, int contrast) { return 0; } static int bfin_lcd_check_fb(struct lcd_device *dev, struct fb_info *fi) { if (!fi || (fi == &bfin_t350mcqb_fb)) return 1; return 0; } static struct lcd_ops bfin_lcd_ops = { .get_power = bfin_lcd_get_power, .set_power = bfin_lcd_set_power, .get_contrast = bfin_lcd_get_contrast, .set_contrast = bfin_lcd_set_contrast, .check_fb = bfin_lcd_check_fb, }; static struct lcd_device *lcd_dev; #endif static irqreturn_t bfin_t350mcqb_irq_error(int irq, void *dev_id) { /*struct bfin_t350mcqbfb_info *info = (struct bfin_t350mcqbfb_info *)dev_id;*/ u16 status = bfin_read_PPI_STATUS(); bfin_write_PPI_STATUS(0xFFFF); if (status) { bfin_t350mcqb_disable_ppi(); disable_dma(CH_PPI); /* start dma */ enable_dma(CH_PPI); bfin_t350mcqb_enable_ppi(); bfin_write_PPI_STATUS(0xFFFF); } return IRQ_HANDLED; } static int __devinit bfin_t350mcqb_probe(struct platform_device *pdev) { struct bfin_t350mcqbfb_info *info; struct fb_info *fbinfo; int ret; printk(KERN_INFO DRIVER_NAME ": %dx%d %d-bit RGB FrameBuffer initializing...\n", LCD_X_RES, LCD_Y_RES, LCD_BPP); if (request_dma(CH_PPI, "CH_PPI") < 0) { printk(KERN_ERR DRIVER_NAME ": couldn't request CH_PPI DMA\n"); ret = -EFAULT; goto out1; } fbinfo = framebuffer_alloc(sizeof(struct bfin_t350mcqbfb_info), &pdev->dev); if (!fbinfo) { ret = -ENOMEM; goto out2; } info = fbinfo->par; info->fb = fbinfo; info->dev = &pdev->dev; platform_set_drvdata(pdev, fbinfo); strcpy(fbinfo->fix.id, driver_name); fbinfo->fix.type = FB_TYPE_PACKED_PIXELS; fbinfo->fix.type_aux = 0; fbinfo->fix.xpanstep = 0; fbinfo->fix.ypanstep = 0; fbinfo->fix.ywrapstep = 0; fbinfo->fix.accel = FB_ACCEL_NONE; fbinfo->fix.visual = FB_VISUAL_TRUECOLOR; fbinfo->var.nonstd = 0; fbinfo->var.activate = FB_ACTIVATE_NOW; fbinfo->var.height = -1; fbinfo->var.width = -1; fbinfo->var.accel_flags = 0; fbinfo->var.vmode = FB_VMODE_NONINTERLACED; fbinfo->var.xres = LCD_X_RES; fbinfo->var.xres_virtual = LCD_X_RES; fbinfo->var.yres = LCD_Y_RES; fbinfo->var.yres_virtual = LCD_Y_RES; fbinfo->var.bits_per_pixel = LCD_BPP; fbinfo->var.red.offset = 0; fbinfo->var.green.offset = 8; fbinfo->var.blue.offset = 16; fbinfo->var.transp.offset = 0; fbinfo->var.red.length = 8; fbinfo->var.green.length = 8; fbinfo->var.blue.length = 8; fbinfo->var.transp.length = 0; fbinfo->fix.smem_len = LCD_X_RES * LCD_Y_RES * LCD_BPP / 8; fbinfo->fix.line_length = fbinfo->var.xres_virtual * fbinfo->var.bits_per_pixel / 8; fbinfo->fbops = &bfin_t350mcqb_fb_ops; fbinfo->flags = FBINFO_FLAG_DEFAULT; info->fb_buffer = dma_alloc_coherent(NULL, fbinfo->fix.smem_len, &info->dma_handle, GFP_KERNEL); if (NULL == info->fb_buffer) { printk(KERN_ERR DRIVER_NAME ": couldn't allocate dma buffer.\n"); ret = -ENOMEM; goto out3; } memset(info->fb_buffer, 0, fbinfo->fix.smem_len); fbinfo->screen_base = (void *)info->fb_buffer + ACTIVE_VIDEO_MEM_OFFSET; fbinfo->fix.smem_start = (int)info->fb_buffer + ACTIVE_VIDEO_MEM_OFFSET; fbinfo->fbops = &bfin_t350mcqb_fb_ops; fbinfo->pseudo_palette = &info->pseudo_pal; if (fb_alloc_cmap(&fbinfo->cmap, BFIN_LCD_NBR_PALETTE_ENTRIES, 0) < 0) { printk(KERN_ERR DRIVER_NAME "Fail to allocate colormap (%d entries)\n", BFIN_LCD_NBR_PALETTE_ENTRIES); ret = -EFAULT; goto out4; } if (bfin_t350mcqb_request_ports(1)) { printk(KERN_ERR DRIVER_NAME ": couldn't request gpio port.\n"); ret = -EFAULT; goto out6; } info->irq = platform_get_irq(pdev, 0); if (info->irq < 0) { ret = -EINVAL; goto out7; } ret = request_irq(info->irq, bfin_t350mcqb_irq_error, IRQF_DISABLED, "PPI ERROR", info); if (ret < 0) { printk(KERN_ERR DRIVER_NAME ": unable to request PPI ERROR IRQ\n"); goto out7; } if (register_framebuffer(fbinfo) < 0) { printk(KERN_ERR DRIVER_NAME ": unable to register framebuffer.\n"); ret = -EINVAL; goto out8; } #ifndef NO_BL_SUPPORT bl_dev = backlight_device_register("bf52x-bl", NULL, NULL, &bfin_lq043fb_bl_ops); bl_dev->props.max_brightness = 255; lcd_dev = lcd_device_register(DRIVER_NAME, NULL, &bfin_lcd_ops); lcd_dev->props.max_contrast = 255, printk(KERN_INFO "Done.\n"); #endif return 0; out8: free_irq(info->irq, info); out7: bfin_t350mcqb_request_ports(0); out6: fb_dealloc_cmap(&fbinfo->cmap); out4: dma_free_coherent(NULL, fbinfo->fix.smem_len, info->fb_buffer, info->dma_handle); out3: framebuffer_release(fbinfo); out2: free_dma(CH_PPI); out1: platform_set_drvdata(pdev, NULL); return ret; } static int bfin_t350mcqb_remove(struct platform_device *pdev) { struct fb_info *fbinfo = platform_get_drvdata(pdev); struct bfin_t350mcqbfb_info *info = fbinfo->par; unregister_framebuffer(fbinfo); free_dma(CH_PPI); free_irq(info->irq, info); if (info->fb_buffer != NULL) dma_free_coherent(NULL, fbinfo->fix.smem_len, info->fb_buffer, info->dma_handle); fb_dealloc_cmap(&fbinfo->cmap); #ifndef NO_BL_SUPPORT lcd_device_unregister(lcd_dev); backlight_device_unregister(bl_dev); #endif bfin_t350mcqb_request_ports(0); platform_set_drvdata(pdev, NULL); framebuffer_release(fbinfo); printk(KERN_INFO DRIVER_NAME ": Unregister LCD driver.\n"); return 0; } #ifdef CONFIG_PM static int bfin_t350mcqb_suspend(struct platform_device *pdev, pm_message_t state) { struct fb_info *fbinfo = platform_get_drvdata(pdev); struct bfin_t350mcqbfb_info *info = fbinfo->par; bfin_t350mcqb_disable_ppi(); disable_dma(CH_PPI); bfin_write_PPI_STATUS(0xFFFF); return 0; } static int bfin_t350mcqb_resume(struct platform_device *pdev) { struct fb_info *fbinfo = platform_get_drvdata(pdev); struct bfin_t350mcqbfb_info *info = fbinfo->par; enable_dma(CH_PPI); bfin_t350mcqb_enable_ppi(); return 0; } #else #define bfin_t350mcqb_suspend NULL #define bfin_t350mcqb_resume NULL #endif static struct platform_driver bfin_t350mcqb_driver = { .probe = bfin_t350mcqb_probe, .remove = bfin_t350mcqb_remove, .suspend = bfin_t350mcqb_suspend, .resume = bfin_t350mcqb_resume, .driver = { .name = DRIVER_NAME, .owner = THIS_MODULE, }, }; static int __devinit bfin_t350mcqb_driver_init(void) { return platform_driver_register(&bfin_t350mcqb_driver); } static void __exit bfin_t350mcqb_driver_cleanup(void) { platform_driver_unregister(&bfin_t350mcqb_driver); } MODULE_DESCRIPTION("Blackfin TFT LCD Driver"); MODULE_LICENSE("GPL"); module_init(bfin_t350mcqb_driver_init); module_exit(bfin_t350mcqb_driver_cleanup);