/* * File: drivers/video/bf54x-lq043.c * Based on: * Author: Michael Hennerich <hennerich@blackfin.uclinux.org> * * Created: * Description: ADSP-BF54x Framebufer driver * * * Modified: * Copyright 2007-2008 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/mm.h> #include <linux/tty.h> #include <linux/slab.h> #include <linux/delay.h> #include <linux/fb.h> #include <linux/ioport.h> #include <linux/init.h> #include <linux/types.h> #include <linux/interrupt.h> #include <linux/sched.h> #include <linux/timer.h> #include <linux/device.h> #include <linux/backlight.h> #include <linux/lcd.h> #include <linux/spinlock.h> #include <linux/dma-mapping.h> #include <linux/platform_device.h> #include <asm/blackfin.h> #include <asm/irq.h> #include <asm/dpmc.h> #include <asm/dma-mapping.h> #include <asm/dma.h> #include <asm/gpio.h> #include <asm/portmux.h> #include <mach/bf54x-lq043.h> #define NO_BL_SUPPORT #define DRIVER_NAME "bf54x-lq043" static char driver_name[] = DRIVER_NAME; #define BFIN_LCD_NBR_PALETTE_ENTRIES 256 #define EPPI0_18 {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, P_PPI0_D8, P_PPI0_D9, P_PPI0_D10, \ P_PPI0_D11, P_PPI0_D12, P_PPI0_D13, P_PPI0_D14, P_PPI0_D15, P_PPI0_D16, P_PPI0_D17, 0} #define EPPI0_24 {P_PPI0_D18, P_PPI0_D19, P_PPI0_D20, P_PPI0_D21, P_PPI0_D22, P_PPI0_D23, 0} struct bfin_bf54xfb_info { struct fb_info *fb; struct device *dev; struct bfin_bf54xfb_mach_info *mach_info; unsigned char *fb_buffer; /* RGB Buffer */ dma_addr_t dma_handle; int lq043_mmap; int lq043_open_cnt; int irq; spinlock_t lock; /* lock */ }; static int nocursor; module_param(nocursor, int, 0644); MODULE_PARM_DESC(nocursor, "cursor enable/disable"); static int outp_rgb666; module_param(outp_rgb666, int, 0); MODULE_PARM_DESC(outp_rgb666, "Output 18-bit RGB666"); #define LCD_X_RES 480 /*Horizontal Resolution */ #define LCD_Y_RES 272 /* Vertical Resolution */ #define LCD_BPP 24 /* Bit Per Pixel */ #define DMA_BUS_SIZE 32 /* -- Horizontal synchronizing -- * * Timing characteristics taken from the SHARP LQ043T1DG01 datasheet * (LCY-W-06602A Page 9 of 22) * * Clock Frequency 1/Tc Min 7.83 Typ 9.00 Max 9.26 MHz * * Period TH - 525 - Clock * Pulse width THp - 41 - Clock * Horizontal period THd - 480 - Clock * Back porch THb - 2 - Clock * Front porch THf - 2 - Clock * * -- Vertical synchronizing -- * Period TV - 286 - Line * Pulse width TVp - 10 - Line * Vertical period TVd - 272 - Line * Back porch TVb - 2 - Line * Front porch TVf - 2 - Line */ #define LCD_CLK (8*1000*1000) /* 8MHz */ /* # active data to transfer after Horizontal Delay clock */ #define EPPI_HCOUNT LCD_X_RES /* # active lines to transfer after Vertical Delay clock */ #define EPPI_VCOUNT LCD_Y_RES /* Samples per Line = 480 (active data) + 45 (padding) */ #define EPPI_LINE 525 /* Lines per Frame = 272 (active data) + 14 (padding) */ #define EPPI_FRAME 286 /* FS1 (Hsync) Width (Typical)*/ #define EPPI_FS1W_HBL 41 /* FS1 (Hsync) Period (Typical) */ #define EPPI_FS1P_AVPL EPPI_LINE /* Horizontal Delay clock after assertion of Hsync (Typical) */ #define EPPI_HDELAY 43 /* FS2 (Vsync) Width = FS1 (Hsync) Period * 10 */ #define EPPI_FS2W_LVB (EPPI_LINE * 10) /* FS2 (Vsync) Period = FS1 (Hsync) Period * Lines per Frame */ #define EPPI_FS2P_LAVF (EPPI_LINE * EPPI_FRAME) /* Vertical Delay after assertion of Vsync (2 Lines) */ #define EPPI_VDELAY 12 #define EPPI_CLIP 0xFF00FF00 /* EPPI Control register configuration value for RGB out * - EPPI as Output * GP 2 frame sync mode, * Internal Clock generation disabled, Internal FS generation enabled, * Receives samples on EPPI_CLK raising edge, Transmits samples on EPPI_CLK falling edge, * FS1 & FS2 are active high, * DLEN = 6 (24 bits for RGB888 out) or 5 (18 bits for RGB666 out) * DMA Unpacking disabled when RGB Formating is enabled, otherwise DMA unpacking enabled * Swapping Enabled, * One (DMA) Channel Mode, * RGB Formatting Enabled for RGB666 output, disabled for RGB888 output * Regular watermark - when FIFO is 100% full, * Urgent watermark - when FIFO is 75% full */ #define EPPI_CONTROL (0x20136E2E | SWAPEN) static inline u16 get_eppi_clkdiv(u32 target_ppi_clk) { u32 sclk = get_sclk(); /* EPPI_CLK = (SCLK) / (2 * (EPPI_CLKDIV[15:0] + 1)) */ return (((sclk / target_ppi_clk) / 2) - 1); } static void config_ppi(struct bfin_bf54xfb_info *fbi) { u16 eppi_clkdiv = get_eppi_clkdiv(LCD_CLK); bfin_write_EPPI0_FS1W_HBL(EPPI_FS1W_HBL); bfin_write_EPPI0_FS1P_AVPL(EPPI_FS1P_AVPL); bfin_write_EPPI0_FS2W_LVB(EPPI_FS2W_LVB); bfin_write_EPPI0_FS2P_LAVF(EPPI_FS2P_LAVF); bfin_write_EPPI0_CLIP(EPPI_CLIP); bfin_write_EPPI0_FRAME(EPPI_FRAME); bfin_write_EPPI0_LINE(EPPI_LINE); bfin_write_EPPI0_HCOUNT(EPPI_HCOUNT); bfin_write_EPPI0_HDELAY(EPPI_HDELAY); bfin_write_EPPI0_VCOUNT(EPPI_VCOUNT); bfin_write_EPPI0_VDELAY(EPPI_VDELAY); bfin_write_EPPI0_CLKDIV(eppi_clkdiv); /* * DLEN = 6 (24 bits for RGB888 out) or 5 (18 bits for RGB666 out) * RGB Formatting Enabled for RGB666 output, disabled for RGB888 output */ if (outp_rgb666) bfin_write_EPPI0_CONTROL((EPPI_CONTROL & ~DLENGTH) | DLEN_18 | RGB_FMT_EN); else bfin_write_EPPI0_CONTROL(((EPPI_CONTROL & ~DLENGTH) | DLEN_24) & ~RGB_FMT_EN); } static int config_dma(struct bfin_bf54xfb_info *fbi) { set_dma_config(CH_EPPI0, set_bfin_dma_config(DIR_READ, DMA_FLOW_AUTO, INTR_DISABLE, DIMENSION_2D, DATA_SIZE_32, DMA_NOSYNC_KEEP_DMA_BUF)); set_dma_x_count(CH_EPPI0, (LCD_X_RES * LCD_BPP) / DMA_BUS_SIZE); set_dma_x_modify(CH_EPPI0, DMA_BUS_SIZE / 8); set_dma_y_count(CH_EPPI0, LCD_Y_RES); set_dma_y_modify(CH_EPPI0, DMA_BUS_SIZE / 8); set_dma_start_addr(CH_EPPI0, (unsigned long)fbi->fb_buffer); return 0; } static int request_ports(struct bfin_bf54xfb_info *fbi) { u16 eppi_req_18[] = EPPI0_18; u16 disp = fbi->mach_info->disp; if (gpio_request(disp, DRIVER_NAME)) { printk(KERN_ERR "Requesting GPIO %d faild\n", disp); return -EFAULT; } if (peripheral_request_list(eppi_req_18, DRIVER_NAME)) { printk(KERN_ERR "Requesting Peripherals faild\n"); gpio_free(disp); return -EFAULT; } if (!outp_rgb666) { u16 eppi_req_24[] = EPPI0_24; if (peripheral_request_list(eppi_req_24, DRIVER_NAME)) { printk(KERN_ERR "Requesting Peripherals faild\n"); peripheral_free_list(eppi_req_18); gpio_free(disp); return -EFAULT; } } gpio_direction_output(disp, 1); return 0; } static void free_ports(struct bfin_bf54xfb_info *fbi) { u16 eppi_req_18[] = EPPI0_18; gpio_free(fbi->mach_info->disp); peripheral_free_list(eppi_req_18); if (!outp_rgb666) { u16 eppi_req_24[] = EPPI0_24; peripheral_free_list(eppi_req_24); } } static int bfin_bf54x_fb_open(struct fb_info *info, int user) { struct bfin_bf54xfb_info *fbi = info->par; spin_lock(&fbi->lock); fbi->lq043_open_cnt++; if (fbi->lq043_open_cnt <= 1) { bfin_write_EPPI0_CONTROL(0); SSYNC(); config_dma(fbi); config_ppi(fbi); /* start dma */ enable_dma(CH_EPPI0); bfin_write_EPPI0_CONTROL(bfin_read_EPPI0_CONTROL() | EPPI_EN); } spin_unlock(&fbi->lock); return 0; } static int bfin_bf54x_fb_release(struct fb_info *info, int user) { struct bfin_bf54xfb_info *fbi = info->par; spin_lock(&fbi->lock); fbi->lq043_open_cnt--; fbi->lq043_mmap = 0; if (fbi->lq043_open_cnt <= 0) { bfin_write_EPPI0_CONTROL(0); SSYNC(); disable_dma(CH_EPPI0); } spin_unlock(&fbi->lock); return 0; } static int bfin_bf54x_fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info) { switch (var->bits_per_pixel) { case 24:/* TRUECOLOUR, 16m */ var->red.offset = 16; var->green.offset = 8; var->blue.offset = 0; 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_bf54x_fb_mmap(struct fb_info *info, struct vm_area_struct *vma) { struct bfin_bf54xfb_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); 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_bf54x_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_bf54x_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_bf54x_fb_ops = { .owner = THIS_MODULE, .fb_open = bfin_bf54x_fb_open, .fb_release = bfin_bf54x_fb_release, .fb_check_var = bfin_bf54x_fb_check_var, .fb_fillrect = cfb_fillrect, .fb_copyarea = cfb_copyarea, .fb_imageblit = cfb_imageblit, .fb_mmap = bfin_bf54x_fb_mmap, .fb_cursor = bfin_bf54x_fb_cursor, .fb_setcolreg = bfin_bf54x_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_bf54x_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_bf54x_irq_error(int irq, void *dev_id) { /*struct bfin_bf54xfb_info *info = dev_id;*/ u16 status = bfin_read_EPPI0_STATUS(); bfin_write_EPPI0_STATUS(0xFFFF); if (status) { bfin_write_EPPI0_CONTROL(bfin_read_EPPI0_CONTROL() & ~EPPI_EN); disable_dma(CH_EPPI0); /* start dma */ enable_dma(CH_EPPI0); bfin_write_EPPI0_CONTROL(bfin_read_EPPI0_CONTROL() | EPPI_EN); bfin_write_EPPI0_STATUS(0xFFFF); } return IRQ_HANDLED; } static int __devinit bfin_bf54x_probe(struct platform_device *pdev) { struct bfin_bf54xfb_info *info; struct fb_info *fbinfo; int ret; printk(KERN_INFO DRIVER_NAME ": FrameBuffer initializing...\n"); if (request_dma(CH_EPPI0, "CH_EPPI0") < 0) { printk(KERN_ERR DRIVER_NAME ": couldn't request CH_EPPI0 DMA\n"); ret = -EFAULT; goto out1; } fbinfo = framebuffer_alloc(sizeof(struct bfin_bf54xfb_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); info->mach_info = pdev->dev.platform_data; if (info->mach_info == NULL) { dev_err(&pdev->dev, "no platform data for lcd, cannot attach\n"); ret = -EINVAL; goto out3; } 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 = info->mach_info->height; fbinfo->var.width = info->mach_info->width; fbinfo->var.accel_flags = 0; fbinfo->var.vmode = FB_VMODE_NONINTERLACED; fbinfo->fbops = &bfin_bf54x_fb_ops; fbinfo->flags = FBINFO_FLAG_DEFAULT; fbinfo->var.xres = info->mach_info->xres.defval; fbinfo->var.xres_virtual = info->mach_info->xres.defval; fbinfo->var.yres = info->mach_info->yres.defval; fbinfo->var.yres_virtual = info->mach_info->yres.defval; fbinfo->var.bits_per_pixel = info->mach_info->bpp.defval; fbinfo->var.upper_margin = 0; fbinfo->var.lower_margin = 0; fbinfo->var.vsync_len = 0; fbinfo->var.left_margin = 0; fbinfo->var.right_margin = 0; fbinfo->var.hsync_len = 0; fbinfo->var.red.offset = 16; fbinfo->var.green.offset = 8; fbinfo->var.blue.offset = 0; 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 = info->mach_info->xres.max * info->mach_info->yres.max * info->mach_info->bpp.max / 8; fbinfo->fix.line_length = fbinfo->var.xres_virtual * fbinfo->var.bits_per_pixel / 8; 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; } fbinfo->screen_base = (void *)info->fb_buffer; fbinfo->fix.smem_start = (int)info->fb_buffer; fbinfo->fbops = &bfin_bf54x_fb_ops; fbinfo->pseudo_palette = kzalloc(sizeof(u32) * 16, GFP_KERNEL); if (!fbinfo->pseudo_palette) { printk(KERN_ERR DRIVER_NAME "Fail to allocate pseudo_palette\n"); ret = -ENOMEM; goto out4; } 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 out5; } if (request_ports(info)) { 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; } if (request_irq(info->irq, bfin_bf54x_irq_error, IRQF_DISABLED, "PPI ERROR", info) < 0) { printk(KERN_ERR DRIVER_NAME ": unable to request PPI ERROR IRQ\n"); ret = -EFAULT; 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("bf54x-bl", NULL, NULL, &bfin_lq043fb_bl_ops); bl_dev->props.max_brightness = 255; lcd_dev = lcd_device_register(DRIVER_NAME, &pdev->dev, 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: free_ports(info); out6: fb_dealloc_cmap(&fbinfo->cmap); out5: kfree(fbinfo->pseudo_palette); out4: dma_free_coherent(NULL, fbinfo->fix.smem_len, info->fb_buffer, info->dma_handle); out3: framebuffer_release(fbinfo); out2: free_dma(CH_EPPI0); out1: platform_set_drvdata(pdev, NULL); return ret; } static int __devexit bfin_bf54x_remove(struct platform_device *pdev) { struct fb_info *fbinfo = platform_get_drvdata(pdev); struct bfin_bf54xfb_info *info = fbinfo->par; free_dma(CH_EPPI0); free_irq(info->irq, info); if (info->fb_buffer != NULL) dma_free_coherent(NULL, fbinfo->fix.smem_len, info->fb_buffer, info->dma_handle); kfree(fbinfo->pseudo_palette); fb_dealloc_cmap(&fbinfo->cmap); #ifndef NO_BL_SUPPORT lcd_device_unregister(lcd_dev); backlight_device_unregister(bl_dev); #endif unregister_framebuffer(fbinfo); free_ports(info); printk(KERN_INFO DRIVER_NAME ": Unregister LCD driver.\n"); return 0; } #ifdef CONFIG_PM static int bfin_bf54x_suspend(struct platform_device *pdev, pm_message_t state) { struct fb_info *fbinfo = platform_get_drvdata(pdev); bfin_write_EPPI0_CONTROL(bfin_read_EPPI0_CONTROL() & ~EPPI_EN); disable_dma(CH_EPPI0); bfin_write_EPPI0_STATUS(0xFFFF); return 0; } static int bfin_bf54x_resume(struct platform_device *pdev) { struct fb_info *fbinfo = platform_get_drvdata(pdev); struct bfin_bf54xfb_info *info = fbinfo->par; if (info->lq043_open_cnt) { bfin_write_EPPI0_CONTROL(0); SSYNC(); config_dma(info); config_ppi(info); /* start dma */ enable_dma(CH_EPPI0); bfin_write_EPPI0_CONTROL(bfin_read_EPPI0_CONTROL() | EPPI_EN); } return 0; } #else #define bfin_bf54x_suspend NULL #define bfin_bf54x_resume NULL #endif static struct platform_driver bfin_bf54x_driver = { .probe = bfin_bf54x_probe, .remove = __devexit_p(bfin_bf54x_remove), .suspend = bfin_bf54x_suspend, .resume = bfin_bf54x_resume, .driver = { .name = DRIVER_NAME, .owner = THIS_MODULE, }, }; static int __init bfin_bf54x_driver_init(void) { return platform_driver_register(&bfin_bf54x_driver); } static void __exit bfin_bf54x_driver_cleanup(void) { platform_driver_unregister(&bfin_bf54x_driver); } MODULE_DESCRIPTION("Blackfin BF54x TFT LCD Driver"); MODULE_LICENSE("GPL"); module_init(bfin_bf54x_driver_init); module_exit(bfin_bf54x_driver_cleanup);