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[ARM] pxafb: allow video memory size to be configurable
The amount of video memory size is decided according to the following order: 1. <xres> x <yres> x <bits_per_pixel> by default, which is the backward compatible way 2. size specified in platform data 3. size specified in module parameter 'options' string or specified in kernel boot command line (see updated Documentation/fb/pxafb.txt) And now since the memory is allocated from system memory, the pxafb_mmap can be removed and the default fb_mmap() should be working all right. Also, since we now have introduced the 'struct pxafb_dma_buff' for DMA descriptors and palettes, the allocation can be separated cleanly. NOTE: the LCD DMA actually supports chained transfer (i.e. page-based transfers), to simplify the logic and keep the performance (with less TLB misses when accessing from memory mapped user space), the memory is allocated by alloc_pages_*() to ensures it's physical contiguous. Signed-off-by: Eric Miao <eric.miao@marvell.com> Signed-off-by: Eric Miao <ycmiao@ycmiao-hp520.(none)>
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Eric Miao
parent
5bfb4093be
commit
77e196752b
@ -5,9 +5,13 @@ The driver supports the following options, either via
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options=<OPTIONS> when modular or video=pxafb:<OPTIONS> when built in.
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For example:
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modprobe pxafb options=mode:640x480-8,passive
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modprobe pxafb options=vmem:2M,mode:640x480-8,passive
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or on the kernel command line
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video=pxafb:mode:640x480-8,passive
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video=pxafb:vmem:2M,mode:640x480-8,passive
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vmem: VIDEO_MEM_SIZE
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Amount of video memory to allocate (can be suffixed with K or M
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for kilobytes or megabytes)
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mode:XRESxYRES[-BPP]
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XRES == LCCR1_PPL + 1
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@ -113,6 +113,7 @@ struct pxafb_mach_info {
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unsigned int num_modes;
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unsigned int lcd_conn;
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unsigned long video_mem_size;
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u_int fixed_modes:1,
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cmap_inverse:1,
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@ -72,6 +72,8 @@ static int pxafb_activate_var(struct fb_var_screeninfo *var,
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struct pxafb_info *);
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static void set_ctrlr_state(struct pxafb_info *fbi, u_int state);
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static unsigned long video_mem_size = 0;
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static inline unsigned long
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lcd_readl(struct pxafb_info *fbi, unsigned int off)
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{
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@ -498,20 +500,6 @@ static int pxafb_blank(int blank, struct fb_info *info)
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return 0;
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}
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static int pxafb_mmap(struct fb_info *info,
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struct vm_area_struct *vma)
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{
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struct pxafb_info *fbi = (struct pxafb_info *)info;
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unsigned long off = vma->vm_pgoff << PAGE_SHIFT;
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if (off < info->fix.smem_len) {
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vma->vm_pgoff += fbi->video_offset / PAGE_SIZE;
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return dma_mmap_writecombine(fbi->dev, vma, fbi->map_cpu,
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fbi->map_dma, fbi->map_size);
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}
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return -EINVAL;
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}
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static struct fb_ops pxafb_ops = {
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.owner = THIS_MODULE,
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.fb_check_var = pxafb_check_var,
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@ -521,7 +509,6 @@ static struct fb_ops pxafb_ops = {
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.fb_copyarea = cfb_copyarea,
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.fb_imageblit = cfb_imageblit,
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.fb_blank = pxafb_blank,
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.fb_mmap = pxafb_mmap,
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};
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/*
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@ -614,7 +601,7 @@ static int setup_frame_dma(struct pxafb_info *fbi, int dma, int pal,
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dma_desc = &fbi->dma_buff->dma_desc[dma];
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dma_desc_off = offsetof(struct pxafb_dma_buff, dma_desc[dma]);
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dma_desc->fsadr = fbi->screen_dma + offset;
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dma_desc->fsadr = fbi->video_mem_phys + offset;
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dma_desc->fidr = 0;
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dma_desc->ldcmd = size;
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@ -1267,69 +1254,30 @@ static int pxafb_resume(struct platform_device *dev)
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#define pxafb_resume NULL
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#endif
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/*
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* pxafb_map_video_memory():
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* Allocates the DRAM memory for the frame buffer. This buffer is
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* remapped into a non-cached, non-buffered, memory region to
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* allow palette and pixel writes to occur without flushing the
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* cache. Once this area is remapped, all virtual memory
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* access to the video memory should occur at the new region.
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*/
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static int __devinit pxafb_map_video_memory(struct pxafb_info *fbi)
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static int __devinit pxafb_init_video_memory(struct pxafb_info *fbi)
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{
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/*
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* We reserve one page for the palette, plus the size
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* of the framebuffer.
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*/
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fbi->video_offset = PAGE_ALIGN(sizeof(struct pxafb_dma_buff));
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fbi->map_size = PAGE_ALIGN(fbi->fb.fix.smem_len + fbi->video_offset);
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fbi->map_cpu = dma_alloc_writecombine(fbi->dev, fbi->map_size,
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&fbi->map_dma, GFP_KERNEL);
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int size = PAGE_ALIGN(fbi->video_mem_size);
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if (fbi->map_cpu) {
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/* prevent initial garbage on screen */
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memset(fbi->map_cpu, 0, fbi->map_size);
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fbi->fb.screen_base = fbi->map_cpu + fbi->video_offset;
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fbi->screen_dma = fbi->map_dma + fbi->video_offset;
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fbi->video_mem = alloc_pages_exact(size, GFP_KERNEL | __GFP_ZERO);
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if (fbi->video_mem == NULL)
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return -ENOMEM;
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/*
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* FIXME: this is actually the wrong thing to place in
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* smem_start. But fbdev suffers from the problem that
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* it needs an API which doesn't exist (in this case,
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* dma_writecombine_mmap)
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*/
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fbi->fb.fix.smem_start = fbi->screen_dma;
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fbi->palette_size = fbi->fb.var.bits_per_pixel == 8 ? 256 : 16;
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fbi->video_mem_phys = virt_to_phys(fbi->video_mem);
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fbi->video_mem_size = size;
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fbi->dma_buff = (void *) fbi->map_cpu;
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fbi->dma_buff_phys = fbi->map_dma;
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fbi->palette_cpu = (u16 *) fbi->dma_buff->palette;
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fbi->fb.fix.smem_start = fbi->video_mem_phys;
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fbi->fb.fix.smem_len = fbi->video_mem_size;
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fbi->fb.screen_base = fbi->video_mem;
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pr_debug("pxafb: palette_mem_size = 0x%08x\n", fbi->palette_size*sizeof(u16));
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}
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return fbi->map_cpu ? 0 : -ENOMEM;
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}
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static void pxafb_decode_mode_info(struct pxafb_info *fbi,
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struct pxafb_mode_info *modes,
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unsigned int num_modes)
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{
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unsigned int i, smemlen;
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pxafb_setmode(&fbi->fb.var, &modes[0]);
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for (i = 0; i < num_modes; i++) {
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smemlen = modes[i].xres * modes[i].yres * modes[i].bpp / 8;
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if (smemlen > fbi->fb.fix.smem_len)
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fbi->fb.fix.smem_len = smemlen;
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}
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return fbi->video_mem ? 0 : -ENOMEM;
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}
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static void pxafb_decode_mach_info(struct pxafb_info *fbi,
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struct pxafb_mach_info *inf)
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{
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unsigned int lcd_conn = inf->lcd_conn;
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struct pxafb_mode_info *m;
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int i;
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fbi->cmap_inverse = inf->cmap_inverse;
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fbi->cmap_static = inf->cmap_static;
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@ -1371,7 +1319,22 @@ static void pxafb_decode_mach_info(struct pxafb_info *fbi,
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fbi->lccr3 |= (lcd_conn & LCD_PCLK_EDGE_FALL) ? LCCR3_PCP : 0;
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decode_mode:
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pxafb_decode_mode_info(fbi, inf->modes, inf->num_modes);
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pxafb_setmode(&fbi->fb.var, &inf->modes[0]);
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/* decide video memory size as follows:
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* 1. default to mode of maximum resolution
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* 2. allow platform to override
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* 3. allow module parameter to override
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*/
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for (i = 0, m = &inf->modes[0]; i < inf->num_modes; i++, m++)
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fbi->video_mem_size = max_t(size_t, fbi->video_mem_size,
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m->xres * m->yres * m->bpp / 8);
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if (inf->video_mem_size > fbi->video_mem_size)
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fbi->video_mem_size = inf->video_mem_size;
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if (video_mem_size > fbi->video_mem_size)
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fbi->video_mem_size = video_mem_size;
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}
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static struct pxafb_info * __devinit pxafb_init_fbinfo(struct device *dev)
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@ -1499,7 +1462,9 @@ static int __devinit parse_opt(struct device *dev, char *this_opt)
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s[0] = '\0';
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if (!strncmp(this_opt, "mode:", 5)) {
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if (!strncmp(this_opt, "vmem:", 5)) {
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video_mem_size = memparse(this_opt + 5, NULL);
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} else if (!strncmp(this_opt, "mode:", 5)) {
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return parse_opt_mode(dev, this_opt);
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} else if (!strncmp(this_opt, "pixclock:", 9)) {
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mode->pixclock = simple_strtoul(this_opt+9, NULL, 0);
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@ -1736,12 +1701,20 @@ static int __devinit pxafb_probe(struct platform_device *dev)
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goto failed_free_res;
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}
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/* Initialize video memory */
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ret = pxafb_map_video_memory(fbi);
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fbi->dma_buff_size = PAGE_ALIGN(sizeof(struct pxafb_dma_buff));
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fbi->dma_buff = dma_alloc_coherent(fbi->dev, fbi->dma_buff_size,
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&fbi->dma_buff_phys, GFP_KERNEL);
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if (fbi->dma_buff == NULL) {
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dev_err(&dev->dev, "failed to allocate memory for DMA\n");
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ret = -ENOMEM;
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goto failed_free_io;
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}
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ret = pxafb_init_video_memory(fbi);
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if (ret) {
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dev_err(&dev->dev, "Failed to allocate video RAM: %d\n", ret);
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ret = -ENOMEM;
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goto failed_free_io;
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goto failed_free_dma;
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}
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irq = platform_get_irq(dev, 0);
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@ -1811,8 +1784,10 @@ static int __devinit pxafb_probe(struct platform_device *dev)
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failed_free_irq:
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free_irq(irq, fbi);
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failed_free_mem:
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dma_free_writecombine(&dev->dev, fbi->map_size,
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fbi->map_cpu, fbi->map_dma);
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free_pages_exact(fbi->video_mem, fbi->video_mem_size);
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failed_free_dma:
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dma_free_coherent(&dev->dev, fbi->dma_buff_size,
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fbi->dma_buff, fbi->dma_buff_phys);
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failed_free_io:
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iounmap(fbi->mmio_base);
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failed_free_res:
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@ -1847,8 +1822,10 @@ static int __devexit pxafb_remove(struct platform_device *dev)
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irq = platform_get_irq(dev, 0);
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free_irq(irq, fbi);
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dma_free_writecombine(&dev->dev, fbi->map_size,
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fbi->map_cpu, fbi->map_dma);
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free_pages_exact(fbi->video_mem, fbi->video_mem_size);
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dma_free_writecombine(&dev->dev, fbi->dma_buff_size,
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fbi->dma_buff, fbi->dma_buff_phys);
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iounmap(fbi->mmio_base);
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@ -69,24 +69,15 @@ struct pxafb_info {
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void __iomem *mmio_base;
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struct pxafb_dma_buff *dma_buff;
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size_t dma_buff_size;
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dma_addr_t dma_buff_phys;
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dma_addr_t fdadr[DMA_MAX];
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/*
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* These are the addresses we mapped
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* the framebuffer memory region to.
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*/
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/* raw memory addresses */
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dma_addr_t map_dma; /* physical */
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u_char * map_cpu; /* virtual */
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u_int map_size;
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/* addresses of pieces placed in raw buffer */
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u_char * screen_cpu; /* virtual address of frame buffer */
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dma_addr_t screen_dma; /* physical address of frame buffer */
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void __iomem *video_mem; /* virtual address of frame buffer */
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unsigned long video_mem_phys; /* physical address of frame buffer */
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size_t video_mem_size; /* size of the frame buffer */
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u16 * palette_cpu; /* virtual address of palette memory */
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u_int palette_size;
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ssize_t video_offset;
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u_int lccr0;
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u_int lccr3;
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