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587 lines
14 KiB
587 lines
14 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* SH7760/SH7763 LCDC Framebuffer driver. |
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* |
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* (c) 2006-2008 MSC Vertriebsges.m.b.H., |
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* Manuel Lauss <[email protected]> |
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* (c) 2008 Nobuhiro Iwamatsu <[email protected]> |
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* |
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* PLEASE HAVE A LOOK AT Documentation/fb/sh7760fb.rst! |
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* |
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* Thanks to Siegfried Schaefer <s.schaefer at schaefer-edv.de> |
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* for his original source and testing! |
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* |
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* sh7760_setcolreg get from drivers/video/sh_mobile_lcdcfb.c |
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*/ |
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#include <linux/completion.h> |
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#include <linux/delay.h> |
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#include <linux/dma-mapping.h> |
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#include <linux/fb.h> |
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#include <linux/interrupt.h> |
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#include <linux/io.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/platform_device.h> |
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#include <linux/slab.h> |
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#include <asm/sh7760fb.h> |
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struct sh7760fb_par { |
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void __iomem *base; |
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int irq; |
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struct sh7760fb_platdata *pd; /* display information */ |
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dma_addr_t fbdma; /* physical address */ |
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int rot; /* rotation enabled? */ |
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u32 pseudo_palette[16]; |
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struct platform_device *dev; |
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struct resource *ioarea; |
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struct completion vsync; /* vsync irq event */ |
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}; |
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static irqreturn_t sh7760fb_irq(int irq, void *data) |
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{ |
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struct completion *c = data; |
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complete(c); |
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return IRQ_HANDLED; |
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} |
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/* wait_for_lps - wait until power supply has reached a certain state. */ |
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static int wait_for_lps(struct sh7760fb_par *par, int val) |
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{ |
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int i = 100; |
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while (--i && ((ioread16(par->base + LDPMMR) & 3) != val)) |
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msleep(1); |
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if (i <= 0) |
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return -ETIMEDOUT; |
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return 0; |
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} |
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|
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/* en/disable the LCDC */ |
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static int sh7760fb_blank(int blank, struct fb_info *info) |
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{ |
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struct sh7760fb_par *par = info->par; |
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struct sh7760fb_platdata *pd = par->pd; |
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unsigned short cntr = ioread16(par->base + LDCNTR); |
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unsigned short intr = ioread16(par->base + LDINTR); |
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int lps; |
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if (blank == FB_BLANK_UNBLANK) { |
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intr |= VINT_START; |
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cntr = LDCNTR_DON2 | LDCNTR_DON; |
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lps = 3; |
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} else { |
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intr &= ~VINT_START; |
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cntr = LDCNTR_DON2; |
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lps = 0; |
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} |
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if (pd->blank) |
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pd->blank(blank); |
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iowrite16(intr, par->base + LDINTR); |
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iowrite16(cntr, par->base + LDCNTR); |
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return wait_for_lps(par, lps); |
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} |
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static int sh7760_setcolreg (u_int regno, |
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u_int red, u_int green, u_int blue, |
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u_int transp, struct fb_info *info) |
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{ |
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u32 *palette = info->pseudo_palette; |
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if (regno >= 16) |
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return -EINVAL; |
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/* only FB_VISUAL_TRUECOLOR supported */ |
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red >>= 16 - info->var.red.length; |
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green >>= 16 - info->var.green.length; |
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blue >>= 16 - info->var.blue.length; |
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transp >>= 16 - info->var.transp.length; |
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palette[regno] = (red << info->var.red.offset) | |
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(green << info->var.green.offset) | |
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(blue << info->var.blue.offset) | |
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(transp << info->var.transp.offset); |
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return 0; |
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} |
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static int sh7760fb_get_color_info(struct device *dev, |
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u16 lddfr, int *bpp, int *gray) |
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{ |
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int lbpp, lgray; |
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lgray = lbpp = 0; |
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switch (lddfr & LDDFR_COLOR_MASK) { |
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case LDDFR_1BPP_MONO: |
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lgray = 1; |
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lbpp = 1; |
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break; |
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case LDDFR_2BPP_MONO: |
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lgray = 1; |
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lbpp = 2; |
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break; |
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case LDDFR_4BPP_MONO: |
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lgray = 1; |
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case LDDFR_4BPP: |
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lbpp = 4; |
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break; |
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case LDDFR_6BPP_MONO: |
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lgray = 1; |
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case LDDFR_8BPP: |
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lbpp = 8; |
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break; |
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case LDDFR_16BPP_RGB555: |
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case LDDFR_16BPP_RGB565: |
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lbpp = 16; |
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lgray = 0; |
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break; |
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default: |
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dev_dbg(dev, "unsupported LDDFR bit depth.\n"); |
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return -EINVAL; |
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} |
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if (bpp) |
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*bpp = lbpp; |
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if (gray) |
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*gray = lgray; |
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return 0; |
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} |
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static int sh7760fb_check_var(struct fb_var_screeninfo *var, |
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struct fb_info *info) |
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{ |
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struct fb_fix_screeninfo *fix = &info->fix; |
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struct sh7760fb_par *par = info->par; |
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int ret, bpp; |
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/* get color info from register value */ |
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ret = sh7760fb_get_color_info(info->dev, par->pd->lddfr, &bpp, NULL); |
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if (ret) |
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return ret; |
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var->bits_per_pixel = bpp; |
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if ((var->grayscale) && (var->bits_per_pixel == 1)) |
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fix->visual = FB_VISUAL_MONO10; |
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else if (var->bits_per_pixel >= 15) |
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fix->visual = FB_VISUAL_TRUECOLOR; |
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else |
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fix->visual = FB_VISUAL_PSEUDOCOLOR; |
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/* TODO: add some more validation here */ |
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return 0; |
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} |
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/* |
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* sh7760fb_set_par - set videomode. |
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* |
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* NOTE: The rotation, grayscale and DSTN codepaths are |
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* totally untested! |
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*/ |
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static int sh7760fb_set_par(struct fb_info *info) |
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{ |
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struct sh7760fb_par *par = info->par; |
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struct fb_videomode *vm = par->pd->def_mode; |
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unsigned long sbase, dstn_off, ldsarl, stride; |
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unsigned short hsynp, hsynw, htcn, hdcn; |
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unsigned short vsynp, vsynw, vtln, vdln; |
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unsigned short lddfr, ldmtr; |
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int ret, bpp, gray; |
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par->rot = par->pd->rotate; |
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/* rotate only works with xres <= 320 */ |
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if (par->rot && (vm->xres > 320)) { |
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dev_dbg(info->dev, "rotation disabled due to display size\n"); |
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par->rot = 0; |
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} |
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/* calculate LCDC reg vals from display parameters */ |
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hsynp = vm->right_margin + vm->xres; |
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hsynw = vm->hsync_len; |
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htcn = vm->left_margin + hsynp + hsynw; |
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hdcn = vm->xres; |
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vsynp = vm->lower_margin + vm->yres; |
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vsynw = vm->vsync_len; |
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vtln = vm->upper_margin + vsynp + vsynw; |
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vdln = vm->yres; |
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/* get color info from register value */ |
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ret = sh7760fb_get_color_info(info->dev, par->pd->lddfr, &bpp, &gray); |
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if (ret) |
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return ret; |
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dev_dbg(info->dev, "%dx%d %dbpp %s (orientation %s)\n", hdcn, |
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vdln, bpp, gray ? "grayscale" : "color", |
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par->rot ? "rotated" : "normal"); |
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#ifdef CONFIG_CPU_LITTLE_ENDIAN |
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lddfr = par->pd->lddfr | (1 << 8); |
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#else |
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lddfr = par->pd->lddfr & ~(1 << 8); |
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#endif |
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ldmtr = par->pd->ldmtr; |
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if (!(vm->sync & FB_SYNC_HOR_HIGH_ACT)) |
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ldmtr |= LDMTR_CL1POL; |
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if (!(vm->sync & FB_SYNC_VERT_HIGH_ACT)) |
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ldmtr |= LDMTR_FLMPOL; |
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/* shut down LCDC before changing display parameters */ |
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sh7760fb_blank(FB_BLANK_POWERDOWN, info); |
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iowrite16(par->pd->ldickr, par->base + LDICKR); /* pixclock */ |
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iowrite16(ldmtr, par->base + LDMTR); /* polarities */ |
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iowrite16(lddfr, par->base + LDDFR); /* color/depth */ |
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iowrite16((par->rot ? 1 << 13 : 0), par->base + LDSMR); /* rotate */ |
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iowrite16(par->pd->ldpmmr, par->base + LDPMMR); /* Power Management */ |
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iowrite16(par->pd->ldpspr, par->base + LDPSPR); /* Power Supply Ctrl */ |
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/* display resolution */ |
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iowrite16(((htcn >> 3) - 1) | (((hdcn >> 3) - 1) << 8), |
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par->base + LDHCNR); |
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iowrite16(vdln - 1, par->base + LDVDLNR); |
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iowrite16(vtln - 1, par->base + LDVTLNR); |
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/* h/v sync signals */ |
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iowrite16((vsynp - 1) | ((vsynw - 1) << 12), par->base + LDVSYNR); |
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iowrite16(((hsynp >> 3) - 1) | (((hsynw >> 3) - 1) << 12), |
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par->base + LDHSYNR); |
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/* AC modulation sig */ |
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iowrite16(par->pd->ldaclnr, par->base + LDACLNR); |
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stride = (par->rot) ? vtln : hdcn; |
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if (!gray) |
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stride *= (bpp + 7) >> 3; |
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else { |
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if (bpp == 1) |
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stride >>= 3; |
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else if (bpp == 2) |
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stride >>= 2; |
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else if (bpp == 4) |
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stride >>= 1; |
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/* 6 bpp == 8 bpp */ |
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} |
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/* if rotated, stride must be power of 2 */ |
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if (par->rot) { |
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unsigned long bit = 1 << 31; |
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while (bit) { |
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if (stride & bit) |
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break; |
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bit >>= 1; |
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} |
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if (stride & ~bit) |
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stride = bit << 1; /* not P-o-2, round up */ |
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} |
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iowrite16(stride, par->base + LDLAOR); |
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/* set display mem start address */ |
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sbase = (unsigned long)par->fbdma; |
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if (par->rot) |
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sbase += (hdcn - 1) * stride; |
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iowrite32(sbase, par->base + LDSARU); |
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/* |
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* for DSTN need to set address for lower half. |
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* I (mlau) don't know which address to set it to, |
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* so I guessed at (stride * yres/2). |
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*/ |
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if (((ldmtr & 0x003f) >= LDMTR_DSTN_MONO_8) && |
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((ldmtr & 0x003f) <= LDMTR_DSTN_COLOR_16)) { |
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dev_dbg(info->dev, " ***** DSTN untested! *****\n"); |
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dstn_off = stride; |
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if (par->rot) |
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dstn_off *= hdcn >> 1; |
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else |
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dstn_off *= vdln >> 1; |
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ldsarl = sbase + dstn_off; |
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} else |
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ldsarl = 0; |
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iowrite32(ldsarl, par->base + LDSARL); /* mem for lower half of DSTN */ |
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info->fix.line_length = stride; |
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sh7760fb_check_var(&info->var, info); |
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sh7760fb_blank(FB_BLANK_UNBLANK, info); /* panel on! */ |
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dev_dbg(info->dev, "hdcn : %6d htcn : %6d\n", hdcn, htcn); |
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dev_dbg(info->dev, "hsynw : %6d hsynp : %6d\n", hsynw, hsynp); |
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dev_dbg(info->dev, "vdln : %6d vtln : %6d\n", vdln, vtln); |
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dev_dbg(info->dev, "vsynw : %6d vsynp : %6d\n", vsynw, vsynp); |
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dev_dbg(info->dev, "clksrc: %6d clkdiv: %6d\n", |
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(par->pd->ldickr >> 12) & 3, par->pd->ldickr & 0x1f); |
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dev_dbg(info->dev, "ldpmmr: 0x%04x ldpspr: 0x%04x\n", par->pd->ldpmmr, |
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par->pd->ldpspr); |
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dev_dbg(info->dev, "ldmtr : 0x%04x lddfr : 0x%04x\n", ldmtr, lddfr); |
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dev_dbg(info->dev, "ldlaor: %ld\n", stride); |
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dev_dbg(info->dev, "ldsaru: 0x%08lx ldsarl: 0x%08lx\n", sbase, ldsarl); |
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return 0; |
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} |
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static const struct fb_ops sh7760fb_ops = { |
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.owner = THIS_MODULE, |
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.fb_blank = sh7760fb_blank, |
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.fb_check_var = sh7760fb_check_var, |
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.fb_setcolreg = sh7760_setcolreg, |
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.fb_set_par = sh7760fb_set_par, |
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.fb_fillrect = cfb_fillrect, |
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.fb_copyarea = cfb_copyarea, |
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.fb_imageblit = cfb_imageblit, |
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}; |
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static void sh7760fb_free_mem(struct fb_info *info) |
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{ |
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struct sh7760fb_par *par = info->par; |
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if (!info->screen_base) |
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return; |
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dma_free_coherent(info->dev, info->screen_size, |
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info->screen_base, par->fbdma); |
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par->fbdma = 0; |
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info->screen_base = NULL; |
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info->screen_size = 0; |
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} |
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/* allocate the framebuffer memory. This memory must be in Area3, |
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* (dictated by the DMA engine) and contiguous, at a 512 byte boundary. |
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*/ |
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static int sh7760fb_alloc_mem(struct fb_info *info) |
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{ |
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struct sh7760fb_par *par = info->par; |
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void *fbmem; |
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unsigned long vram; |
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int ret, bpp; |
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if (info->screen_base) |
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return 0; |
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/* get color info from register value */ |
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ret = sh7760fb_get_color_info(info->dev, par->pd->lddfr, &bpp, NULL); |
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if (ret) { |
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printk(KERN_ERR "colinfo\n"); |
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return ret; |
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} |
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/* min VRAM: xres_min = 16, yres_min = 1, bpp = 1: 2byte -> 1 page |
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max VRAM: xres_max = 1024, yres_max = 1024, bpp = 16: 2MB */ |
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vram = info->var.xres * info->var.yres; |
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if (info->var.grayscale) { |
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if (bpp == 1) |
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vram >>= 3; |
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else if (bpp == 2) |
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vram >>= 2; |
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else if (bpp == 4) |
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vram >>= 1; |
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} else if (bpp > 8) |
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vram *= 2; |
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if ((vram < 1) || (vram > 1024 * 2048)) { |
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dev_dbg(info->dev, "too much VRAM required. Check settings\n"); |
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return -ENODEV; |
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} |
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if (vram < PAGE_SIZE) |
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vram = PAGE_SIZE; |
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fbmem = dma_alloc_coherent(info->dev, vram, &par->fbdma, GFP_KERNEL); |
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if (!fbmem) |
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return -ENOMEM; |
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if ((par->fbdma & SH7760FB_DMA_MASK) != SH7760FB_DMA_MASK) { |
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sh7760fb_free_mem(info); |
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dev_err(info->dev, "kernel gave me memory at 0x%08lx, which is" |
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"unusable for the LCDC\n", (unsigned long)par->fbdma); |
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return -ENOMEM; |
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} |
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info->screen_base = fbmem; |
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info->screen_size = vram; |
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info->fix.smem_start = (unsigned long)info->screen_base; |
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info->fix.smem_len = info->screen_size; |
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return 0; |
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} |
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static int sh7760fb_probe(struct platform_device *pdev) |
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{ |
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struct fb_info *info; |
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struct resource *res; |
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struct sh7760fb_par *par; |
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int ret; |
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
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if (unlikely(res == NULL)) { |
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dev_err(&pdev->dev, "invalid resource\n"); |
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return -EINVAL; |
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} |
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info = framebuffer_alloc(sizeof(struct sh7760fb_par), &pdev->dev); |
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if (!info) |
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return -ENOMEM; |
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par = info->par; |
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par->dev = pdev; |
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par->pd = pdev->dev.platform_data; |
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if (!par->pd) { |
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dev_dbg(info->dev, "no display setup data!\n"); |
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ret = -ENODEV; |
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goto out_fb; |
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} |
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par->ioarea = request_mem_region(res->start, |
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resource_size(res), pdev->name); |
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if (!par->ioarea) { |
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dev_err(&pdev->dev, "mmio area busy\n"); |
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ret = -EBUSY; |
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goto out_fb; |
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} |
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par->base = ioremap(res->start, resource_size(res)); |
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if (!par->base) { |
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dev_err(&pdev->dev, "cannot remap\n"); |
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ret = -ENODEV; |
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goto out_res; |
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} |
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iowrite16(0, par->base + LDINTR); /* disable vsync irq */ |
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par->irq = platform_get_irq(pdev, 0); |
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if (par->irq >= 0) { |
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ret = request_irq(par->irq, sh7760fb_irq, 0, |
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"sh7760-lcdc", &par->vsync); |
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if (ret) { |
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dev_err(&pdev->dev, "cannot grab IRQ\n"); |
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par->irq = -ENXIO; |
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} else |
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disable_irq_nosync(par->irq); |
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} |
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fb_videomode_to_var(&info->var, par->pd->def_mode); |
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ret = sh7760fb_alloc_mem(info); |
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if (ret) { |
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dev_dbg(info->dev, "framebuffer memory allocation failed!\n"); |
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goto out_unmap; |
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} |
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info->pseudo_palette = par->pseudo_palette; |
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|
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/* fixup color register bitpositions. These are fixed by hardware */ |
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info->var.red.offset = 11; |
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info->var.red.length = 5; |
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info->var.red.msb_right = 0; |
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info->var.green.offset = 5; |
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info->var.green.length = 6; |
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info->var.green.msb_right = 0; |
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info->var.blue.offset = 0; |
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info->var.blue.length = 5; |
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info->var.blue.msb_right = 0; |
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info->var.transp.offset = 0; |
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info->var.transp.length = 0; |
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info->var.transp.msb_right = 0; |
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strcpy(info->fix.id, "sh7760-lcdc"); |
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|
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/* set the DON2 bit now, before cmap allocation, as it will randomize |
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* palette memory. |
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*/ |
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iowrite16(LDCNTR_DON2, par->base + LDCNTR); |
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info->fbops = &sh7760fb_ops; |
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ret = fb_alloc_cmap(&info->cmap, 256, 0); |
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if (ret) { |
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dev_dbg(info->dev, "Unable to allocate cmap memory\n"); |
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goto out_mem; |
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} |
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ret = register_framebuffer(info); |
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if (ret < 0) { |
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dev_dbg(info->dev, "cannot register fb!\n"); |
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goto out_cmap; |
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} |
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platform_set_drvdata(pdev, info); |
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|
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printk(KERN_INFO "%s: memory at phys 0x%08lx-0x%08lx, size %ld KiB\n", |
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pdev->name, |
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(unsigned long)par->fbdma, |
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(unsigned long)(par->fbdma + info->screen_size - 1), |
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info->screen_size >> 10); |
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|
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return 0; |
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|
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out_cmap: |
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sh7760fb_blank(FB_BLANK_POWERDOWN, info); |
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fb_dealloc_cmap(&info->cmap); |
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out_mem: |
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sh7760fb_free_mem(info); |
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out_unmap: |
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if (par->irq >= 0) |
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free_irq(par->irq, &par->vsync); |
|
iounmap(par->base); |
|
out_res: |
|
release_mem_region(res->start, resource_size(res)); |
|
out_fb: |
|
framebuffer_release(info); |
|
return ret; |
|
} |
|
|
|
static int sh7760fb_remove(struct platform_device *dev) |
|
{ |
|
struct fb_info *info = platform_get_drvdata(dev); |
|
struct sh7760fb_par *par = info->par; |
|
|
|
sh7760fb_blank(FB_BLANK_POWERDOWN, info); |
|
unregister_framebuffer(info); |
|
fb_dealloc_cmap(&info->cmap); |
|
sh7760fb_free_mem(info); |
|
if (par->irq >= 0) |
|
free_irq(par->irq, &par->vsync); |
|
iounmap(par->base); |
|
release_mem_region(par->ioarea->start, resource_size(par->ioarea)); |
|
framebuffer_release(info); |
|
|
|
return 0; |
|
} |
|
|
|
static struct platform_driver sh7760_lcdc_driver = { |
|
.driver = { |
|
.name = "sh7760-lcdc", |
|
}, |
|
.probe = sh7760fb_probe, |
|
.remove = sh7760fb_remove, |
|
}; |
|
|
|
module_platform_driver(sh7760_lcdc_driver); |
|
|
|
MODULE_AUTHOR("Nobuhiro Iwamatsu, Manuel Lauss"); |
|
MODULE_DESCRIPTION("FBdev for SH7760/63 integrated LCD Controller"); |
|
MODULE_LICENSE("GPL v2");
|
|
|