--- /dev/null
+/*
+ * linux/drivers/video/imxfb.c
+ *
+ * Freescale i.MX Frame Buffer device driver
+ *
+ * Copyright (C) 2004 Sascha Hauer, Pengutronix
+ * Based on acornfb.c Copyright (C) Russell King.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file COPYING in the main directory of this archive for
+ * more details.
+ *
+ * Please direct your questions and comments on this driver to the following
+ * email address:
+ *
+ * linux-arm-kernel@lists.arm.linux.org.uk
+ */
+
+//#define DEBUG 1
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+#include <linux/fb.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/cpufreq.h>
+#include <linux/device.h>
+#include <linux/dma-mapping.h>
+
+#include <asm/hardware.h>
+#include <asm/io.h>
+#include <asm/mach-types.h>
+#include <asm/uaccess.h>
+#include <asm/arch/imxfb.h>
+
+/*
+ * Complain if VAR is out of range.
+ */
+#define DEBUG_VAR 1
+
+#include "imxfb.h"
+
+static struct imxfb_rgb def_rgb_16 = {
+ .red = { .offset = 8, .length = 4, },
+ .green = { .offset = 4, .length = 4, },
+ .blue = { .offset = 0, .length = 4, },
+ .transp = { .offset = 0, .length = 0, },
+};
+
+static struct imxfb_rgb def_rgb_8 = {
+ .red = { .offset = 0, .length = 8, },
+ .green = { .offset = 0, .length = 8, },
+ .blue = { .offset = 0, .length = 8, },
+ .transp = { .offset = 0, .length = 0, },
+};
+
+static int imxfb_activate_var(struct fb_var_screeninfo *var, struct fb_info *info);
+
+static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
+{
+ chan &= 0xffff;
+ chan >>= 16 - bf->length;
+ return chan << bf->offset;
+}
+
+#define LCDC_PALETTE(x) __REG2(IMX_LCDC_BASE+0x800, (x)<<2)
+static int
+imxfb_setpalettereg(u_int regno, u_int red, u_int green, u_int blue,
+ u_int trans, struct fb_info *info)
+{
+ struct imxfb_info *fbi = info->par;
+ u_int val, ret = 1;
+
+#define CNVT_TOHW(val,width) ((((val)<<(width))+0x7FFF-(val))>>16)
+ if (regno < fbi->palette_size) {
+ val = (CNVT_TOHW(red, 4) << 8) |
+ (CNVT_TOHW(green,4) << 4) |
+ CNVT_TOHW(blue, 4);
+
+ LCDC_PALETTE(regno) = val;
+ ret = 0;
+ }
+ return ret;
+}
+
+static int
+imxfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
+ u_int trans, struct fb_info *info)
+{
+ struct imxfb_info *fbi = info->par;
+ unsigned int val;
+ int ret = 1;
+
+ /*
+ * If inverse mode was selected, invert all the colours
+ * rather than the register number. The register number
+ * is what you poke into the framebuffer to produce the
+ * colour you requested.
+ */
+ if (fbi->cmap_inverse) {
+ red = 0xffff - red;
+ green = 0xffff - green;
+ blue = 0xffff - blue;
+ }
+
+ /*
+ * If greyscale is true, then we convert the RGB value
+ * to greyscale no mater what visual we are using.
+ */
+ if (info->var.grayscale)
+ red = green = blue = (19595 * red + 38470 * green +
+ 7471 * blue) >> 16;
+
+ switch (info->fix.visual) {
+ case FB_VISUAL_TRUECOLOR:
+ /*
+ * 12 or 16-bit True Colour. We encode the RGB value
+ * according to the RGB bitfield information.
+ */
+ if (regno < 16) {
+ u32 *pal = info->pseudo_palette;
+
+ val = chan_to_field(red, &info->var.red);
+ val |= chan_to_field(green, &info->var.green);
+ val |= chan_to_field(blue, &info->var.blue);
+
+ pal[regno] = val;
+ ret = 0;
+ }
+ break;
+
+ case FB_VISUAL_STATIC_PSEUDOCOLOR:
+ case FB_VISUAL_PSEUDOCOLOR:
+ ret = imxfb_setpalettereg(regno, red, green, blue, trans, info);
+ break;
+ }
+
+ return ret;
+}
+
+/*
+ * imxfb_check_var():
+ * Round up in the following order: bits_per_pixel, xres,
+ * yres, xres_virtual, yres_virtual, xoffset, yoffset, grayscale,
+ * bitfields, horizontal timing, vertical timing.
+ */
+static int
+imxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
+{
+ struct imxfb_info *fbi = info->par;
+ int rgbidx;
+
+ if (var->xres < MIN_XRES)
+ var->xres = MIN_XRES;
+ if (var->yres < MIN_YRES)
+ var->yres = MIN_YRES;
+ if (var->xres > fbi->max_xres)
+ var->xres = fbi->max_xres;
+ if (var->yres > fbi->max_yres)
+ var->yres = fbi->max_yres;
+ var->xres_virtual = max(var->xres_virtual, var->xres);
+ var->yres_virtual = max(var->yres_virtual, var->yres);
+
+ pr_debug("var->bits_per_pixel=%d\n", var->bits_per_pixel);
+ switch (var->bits_per_pixel) {
+ case 16:
+ rgbidx = RGB_16;
+ break;
+ case 8:
+ rgbidx = RGB_8;
+ break;
+ default:
+ rgbidx = RGB_16;
+ }
+
+ /*
+ * Copy the RGB parameters for this display
+ * from the machine specific parameters.
+ */
+ var->red = fbi->rgb[rgbidx]->red;
+ var->green = fbi->rgb[rgbidx]->green;
+ var->blue = fbi->rgb[rgbidx]->blue;
+ var->transp = fbi->rgb[rgbidx]->transp;
+
+ pr_debug("RGBT length = %d:%d:%d:%d\n",
+ var->red.length, var->green.length, var->blue.length,
+ var->transp.length);
+
+ pr_debug("RGBT offset = %d:%d:%d:%d\n",
+ var->red.offset, var->green.offset, var->blue.offset,
+ var->transp.offset);
+
+ return 0;
+}
+
+/*
+ * imxfb_set_par():
+ * Set the user defined part of the display for the specified console
+ */
+static int imxfb_set_par(struct fb_info *info)
+{
+ struct imxfb_info *fbi = info->par;
+ struct fb_var_screeninfo *var = &info->var;
+
+ pr_debug("set_par\n");
+
+ if (var->bits_per_pixel == 16)
+ info->fix.visual = FB_VISUAL_TRUECOLOR;
+ else if (!fbi->cmap_static)
+ info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
+ else {
+ /*
+ * Some people have weird ideas about wanting static
+ * pseudocolor maps. I suspect their user space
+ * applications are broken.
+ */
+ info->fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR;
+ }
+
+ info->fix.line_length = var->xres_virtual *
+ var->bits_per_pixel / 8;
+ fbi->palette_size = var->bits_per_pixel == 8 ? 256 : 16;
+
+ imxfb_activate_var(var, info);
+
+ return 0;
+}
+
+static void imxfb_enable_controller(struct imxfb_info *fbi)
+{
+ pr_debug("Enabling LCD controller\n");
+
+ /* initialize LCDC */
+ LCDC_RMCR &= ~RMCR_LCDC_EN; /* just to be safe... */
+
+ LCDC_SSA = fbi->screen_dma;
+ /* physical screen start address */
+ LCDC_VPW = VPW_VPW(fbi->max_xres * fbi->max_bpp / 8 / 4);
+
+ LCDC_POS = 0x00000000; /* panning offset 0 (0 pixel offset) */
+
+ /* disable hardware cursor */
+ LCDC_CPOS &= ~(CPOS_CC0 | CPOS_CC1);
+
+ /* fixed burst length (see erratum 11) */
+ LCDC_DMACR = DMACR_BURST | DMACR_HM(8) | DMACR_TM(2);
+
+ LCDC_RMCR = RMCR_LCDC_EN;
+
+ if(fbi->backlight_power)
+ fbi->backlight_power(1);
+ if(fbi->lcd_power)
+ fbi->lcd_power(1);
+}
+
+static void imxfb_disable_controller(struct imxfb_info *fbi)
+{
+ pr_debug("Disabling LCD controller\n");
+
+ if(fbi->backlight_power)
+ fbi->backlight_power(0);
+ if(fbi->lcd_power)
+ fbi->lcd_power(0);
+
+ LCDC_RMCR = 0;
+}
+
+static int imxfb_blank(int blank, struct fb_info *info)
+{
+ struct imxfb_info *fbi = info->par;
+
+ pr_debug("imxfb_blank: blank=%d\n", blank);
+
+ switch (blank) {
+ case FB_BLANK_POWERDOWN:
+ case FB_BLANK_VSYNC_SUSPEND:
+ case FB_BLANK_HSYNC_SUSPEND:
+ case FB_BLANK_NORMAL:
+ imxfb_disable_controller(fbi);
+ break;
+
+ case FB_BLANK_UNBLANK:
+ imxfb_enable_controller(fbi);
+ break;
+ }
+ return 0;
+}
+
+static struct fb_ops imxfb_ops = {
+ .owner = THIS_MODULE,
+ .fb_check_var = imxfb_check_var,
+ .fb_set_par = imxfb_set_par,
+ .fb_setcolreg = imxfb_setcolreg,
+ .fb_fillrect = cfb_fillrect,
+ .fb_copyarea = cfb_copyarea,
+ .fb_imageblit = cfb_imageblit,
+ .fb_blank = imxfb_blank,
+ .fb_cursor = soft_cursor, /* FIXME: i.MX can do hardware cursor */
+};
+
+/*
+ * imxfb_activate_var():
+ * Configures LCD Controller based on entries in var parameter. Settings are
+ * only written to the controller if changes were made.
+ */
+static int imxfb_activate_var(struct fb_var_screeninfo *var, struct fb_info *info)
+{
+ struct imxfb_info *fbi = info->par;
+ pr_debug("var: xres=%d hslen=%d lm=%d rm=%d\n",
+ var->xres, var->hsync_len,
+ var->left_margin, var->right_margin);
+ pr_debug("var: yres=%d vslen=%d um=%d bm=%d\n",
+ var->yres, var->vsync_len,
+ var->upper_margin, var->lower_margin);
+
+#if DEBUG_VAR
+ if (var->xres < 16 || var->xres > 1024)
+ printk(KERN_ERR "%s: invalid xres %d\n",
+ info->fix.id, var->xres);
+ if (var->hsync_len < 1 || var->hsync_len > 64)
+ printk(KERN_ERR "%s: invalid hsync_len %d\n",
+ info->fix.id, var->hsync_len);
+ if (var->left_margin > 255)
+ printk(KERN_ERR "%s: invalid left_margin %d\n",
+ info->fix.id, var->left_margin);
+ if (var->right_margin > 255)
+ printk(KERN_ERR "%s: invalid right_margin %d\n",
+ info->fix.id, var->right_margin);
+ if (var->yres < 1 || var->yres > 511)
+ printk(KERN_ERR "%s: invalid yres %d\n",
+ info->fix.id, var->yres);
+ if (var->vsync_len > 100)
+ printk(KERN_ERR "%s: invalid vsync_len %d\n",
+ info->fix.id, var->vsync_len);
+ if (var->upper_margin > 63)
+ printk(KERN_ERR "%s: invalid upper_margin %d\n",
+ info->fix.id, var->upper_margin);
+ if (var->lower_margin > 255)
+ printk(KERN_ERR "%s: invalid lower_margin %d\n",
+ info->fix.id, var->lower_margin);
+#endif
+
+ LCDC_HCR = HCR_H_WIDTH(var->hsync_len) |
+ HCR_H_WAIT_1(var->left_margin) |
+ HCR_H_WAIT_2(var->right_margin);
+
+ LCDC_VCR = VCR_V_WIDTH(var->vsync_len) |
+ VCR_V_WAIT_1(var->upper_margin) |
+ VCR_V_WAIT_2(var->lower_margin);
+
+ LCDC_SIZE = SIZE_XMAX(var->xres) | SIZE_YMAX(var->yres);
+ LCDC_PCR = fbi->pcr;
+ LCDC_PWMR = fbi->pwmr;
+ LCDC_LSCR1 = fbi->lscr1;
+
+ return 0;
+}
+
+static void imxfb_setup_gpio(struct imxfb_info *fbi)
+{
+ int width;
+
+ LCDC_RMCR &= ~(RMCR_LCDC_EN | RMCR_SELF_REF);
+
+ if( fbi->pcr & PCR_TFT )
+ width = 16;
+ else
+ width = 1 << ((fbi->pcr >> 28) & 0x3);
+
+ switch(width) {
+ case 16:
+ imx_gpio_mode(PD30_PF_LD15);
+ imx_gpio_mode(PD29_PF_LD14);
+ imx_gpio_mode(PD28_PF_LD13);
+ imx_gpio_mode(PD27_PF_LD12);
+ imx_gpio_mode(PD26_PF_LD11);
+ imx_gpio_mode(PD25_PF_LD10);
+ imx_gpio_mode(PD24_PF_LD9);
+ imx_gpio_mode(PD23_PF_LD8);
+ case 8:
+ imx_gpio_mode(PD22_PF_LD7);
+ imx_gpio_mode(PD21_PF_LD6);
+ imx_gpio_mode(PD20_PF_LD5);
+ imx_gpio_mode(PD19_PF_LD4);
+ case 4:
+ imx_gpio_mode(PD18_PF_LD3);
+ imx_gpio_mode(PD17_PF_LD2);
+ case 2:
+ imx_gpio_mode(PD16_PF_LD1);
+ case 1:
+ imx_gpio_mode(PD15_PF_LD0);
+ }
+
+ /* initialize GPIOs */
+ imx_gpio_mode(PD6_PF_LSCLK);
+ imx_gpio_mode(PD10_PF_SPL_SPR);
+ imx_gpio_mode(PD11_PF_CONTRAST);
+ imx_gpio_mode(PD14_PF_FLM_VSYNC);
+ imx_gpio_mode(PD13_PF_LP_HSYNC);
+ imx_gpio_mode(PD7_PF_REV);
+ imx_gpio_mode(PD8_PF_CLS);
+
+#ifndef CONFIG_MACH_PIMX1
+ /* on PiMX1 used as buffers enable signal
+ */
+ imx_gpio_mode(PD9_PF_PS);
+#endif
+
+#ifndef CONFIG_MACH_MX1FS2
+ /* on mx1fs2 this pin is used to (de)activate the display, so we need
+ * it as a normal gpio
+ */
+ imx_gpio_mode(PD12_PF_ACD_OE);
+#endif
+
+}
+
+#ifdef CONFIG_PM
+/*
+ * Power management hooks. Note that we won't be called from IRQ context,
+ * unlike the blank functions above, so we may sleep.
+ */
+static int imxfb_suspend(struct device *dev, u32 state, u32 level)
+{
+ struct imxfb_info *fbi = dev_get_drvdata(dev);
+ pr_debug("%s\n",__FUNCTION__);
+
+ if (level == SUSPEND_DISABLE || level == SUSPEND_POWER_DOWN)
+ imxfb_disable_controller(fbi);
+ return 0;
+}
+
+static int imxfb_resume(struct device *dev, u32 level)
+{
+ struct imxfb_info *fbi = dev_get_drvdata(dev);
+ pr_debug("%s\n",__FUNCTION__);
+
+ if (level == RESUME_ENABLE)
+ imxfb_enable_controller(fbi);
+ return 0;
+}
+#else
+#define imxfb_suspend NULL
+#define imxfb_resume NULL
+#endif
+
+static int __init imxfb_init_fbinfo(struct device *dev)
+{
+ struct imxfb_mach_info *inf = dev->platform_data;
+ struct fb_info *info = dev_get_drvdata(dev);
+ struct imxfb_info *fbi = info->par;
+
+ pr_debug("%s\n",__FUNCTION__);
+
+ info->pseudo_palette = kmalloc( sizeof(u32) * 16, GFP_KERNEL);
+ if (!info->pseudo_palette)
+ return -ENOMEM;
+
+ memset(fbi, 0, sizeof(struct imxfb_info));
+ fbi->dev = dev;
+
+ strlcpy(info->fix.id, IMX_NAME, sizeof(info->fix.id));
+
+ info->fix.type = FB_TYPE_PACKED_PIXELS;
+ info->fix.type_aux = 0;
+ info->fix.xpanstep = 0;
+ info->fix.ypanstep = 0;
+ info->fix.ywrapstep = 0;
+ info->fix.accel = FB_ACCEL_NONE;
+
+ info->var.nonstd = 0;
+ info->var.activate = FB_ACTIVATE_NOW;
+ info->var.height = -1;
+ info->var.width = -1;
+ info->var.accel_flags = 0;
+ info->var.vmode = FB_VMODE_NONINTERLACED;
+
+ info->fbops = &imxfb_ops;
+ info->flags = FBINFO_FLAG_DEFAULT;
+ info->pseudo_palette = (fbi + 1);
+
+ fbi->rgb[RGB_16] = &def_rgb_16;
+ fbi->rgb[RGB_8] = &def_rgb_8;
+
+ fbi->max_xres = inf->xres;
+ info->var.xres = inf->xres;
+ info->var.xres_virtual = inf->xres;
+ fbi->max_yres = inf->yres;
+ info->var.yres = inf->yres;
+ info->var.yres_virtual = inf->yres;
+ fbi->max_bpp = inf->bpp;
+ info->var.bits_per_pixel = inf->bpp;
+ info->var.pixclock = inf->pixclock;
+ info->var.hsync_len = inf->hsync_len;
+ info->var.left_margin = inf->left_margin;
+ info->var.right_margin = inf->right_margin;
+ info->var.vsync_len = inf->vsync_len;
+ info->var.upper_margin = inf->upper_margin;
+ info->var.lower_margin = inf->lower_margin;
+ info->var.sync = inf->sync;
+ info->var.grayscale = inf->cmap_greyscale;
+ fbi->cmap_inverse = inf->cmap_inverse;
+ fbi->pcr = inf->pcr;
+ fbi->lscr1 = inf->lscr1;
+ fbi->pwmr = inf->pwmr;
+ fbi->lcd_power = inf->lcd_power;
+ fbi->backlight_power = inf->backlight_power;
+ info->fix.smem_len = fbi->max_xres * fbi->max_yres *
+ fbi->max_bpp / 8;
+
+ return 0;
+}
+
+/*
+ * Allocates the DRAM memory for the frame buffer. This buffer is
+ * remapped into a non-cached, non-buffered, memory region to
+ * allow pixel writes to occur without flushing the cache.
+ * Once this area is remapped, all virtual memory access to the
+ * video memory should occur at the new region.
+ */
+static int __init imxfb_map_video_memory(struct fb_info *info)
+{
+ struct imxfb_info *fbi = info->par;
+
+ fbi->map_size = PAGE_ALIGN(info->fix.smem_len);
+ fbi->map_cpu = dma_alloc_writecombine(fbi->dev, fbi->map_size,
+ &fbi->map_dma,GFP_KERNEL);
+
+ if (fbi->map_cpu) {
+ info->screen_base = fbi->map_cpu;
+ fbi->screen_cpu = fbi->map_cpu;
+ fbi->screen_dma = fbi->map_dma;
+ info->fix.smem_start = fbi->screen_dma;
+ }
+
+ return fbi->map_cpu ? 0 : -ENOMEM;
+}
+
+static int __init imxfb_probe(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct imxfb_info *fbi;
+ struct fb_info *info;
+ struct imxfb_mach_info *inf;
+ struct resource *res;
+ int ret;
+
+ printk("i.MX Framebuffer driver\n");
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if(!res)
+ return -ENODEV;
+
+ inf = dev->platform_data;
+ if(!inf) {
+ dev_err(dev,"No platform_data available\n");
+ return -ENOMEM;
+ }
+
+ info = framebuffer_alloc(sizeof(struct imxfb_info), dev);
+ if(!info)
+ return -ENOMEM;
+
+ fbi = info->par;
+
+ dev_set_drvdata(dev, info);
+
+ ret = imxfb_init_fbinfo(dev);
+ if( ret < 0 )
+ goto failed_init;
+
+ res = request_mem_region(res->start, res->end - res->start + 1, "IMXFB");
+ if (!res) {
+ ret = -EBUSY;
+ goto failed_regs;
+ }
+
+ if (!inf->fixed_screen_cpu) {
+ ret = imxfb_map_video_memory(info);
+ if (ret) {
+ dev_err(dev, "Failed to allocate video RAM: %d\n", ret);
+ ret = -ENOMEM;
+ goto failed_map;
+ }
+ } else {
+ /* Fixed framebuffer mapping enables location of the screen in eSRAM */
+ fbi->map_cpu = inf->fixed_screen_cpu;
+ fbi->map_dma = inf->fixed_screen_dma;
+ info->screen_base = fbi->map_cpu;
+ fbi->screen_cpu = fbi->map_cpu;
+ fbi->screen_dma = fbi->map_dma;
+ info->fix.smem_start = fbi->screen_dma;
+ }
+
+ /*
+ * This makes sure that our colour bitfield
+ * descriptors are correctly initialised.
+ */
+ imxfb_check_var(&info->var, info);
+
+ ret = fb_alloc_cmap(&info->cmap, 1<<info->var.bits_per_pixel, 0);
+ if (ret < 0)
+ goto failed_cmap;
+
+ imxfb_setup_gpio(fbi);
+
+ imxfb_set_par(info);
+ ret = register_framebuffer(info);
+ if (ret < 0) {
+ dev_err(dev, "failed to register framebuffer\n");
+ goto failed_register;
+ }
+
+ imxfb_enable_controller(fbi);
+
+ return 0;
+
+failed_register:
+ fb_dealloc_cmap(&info->cmap);
+failed_cmap:
+ if (!inf->fixed_screen_cpu)
+ dma_free_writecombine(dev,fbi->map_size,fbi->map_cpu,
+ fbi->map_dma);
+failed_map:
+ kfree(info->pseudo_palette);
+failed_regs:
+ release_mem_region(res->start, res->end - res->start);
+failed_init:
+ dev_set_drvdata(dev, NULL);
+ framebuffer_release(info);
+ return ret;
+}
+
+static int imxfb_remove(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct fb_info *info = dev_get_drvdata(dev);
+ struct resource *res;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+
+ /* disable LCD controller */
+ LCDC_RMCR &= ~RMCR_LCDC_EN;
+
+ unregister_framebuffer(info);
+
+ fb_dealloc_cmap(&info->cmap);
+ kfree(info->pseudo_palette);
+ framebuffer_release(info);
+
+ release_mem_region(res->start, res->end - res->start + 1);
+ dev_set_drvdata(dev, NULL);
+
+ return 0;
+}
+
+void imxfb_shutdown(struct device * dev)
+{
+ /* disable LCD Controller */
+ LCDC_RMCR &= ~RMCR_LCDC_EN;
+}
+
+static struct device_driver imxfb_driver = {
+ .name = "imx-fb",
+ .bus = &platform_bus_type,
+ .probe = imxfb_probe,
+ .suspend = imxfb_suspend,
+ .resume = imxfb_resume,
+ .remove = imxfb_remove,
+ .shutdown = imxfb_shutdown,
+};
+
+int __init imxfb_init(void)
+{
+ return driver_register(&imxfb_driver);
+}
+
+static void __exit imxfb_cleanup(void)
+{
+ driver_unregister(&imxfb_driver);
+}
+
+module_init(imxfb_init);
+module_exit(imxfb_cleanup);
+
+MODULE_DESCRIPTION("Motorola i.MX framebuffer driver");
+MODULE_AUTHOR("Sascha Hauer, Pengutronix");
+MODULE_LICENSE("GPL");
projects / openwrt / staging / blogic.git / commitdiff