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[/] [or1k_soc_on_altera_embedded_dev_kit/] [tags/] [linux-2.6/] [linux-2.6.24_or32_unified_v2.3/] [arch/] [arm/] [plat-omap/] [fb.c] - Rev 3
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/* * File: arch/arm/plat-omap/fb.c * * Framebuffer device registration for TI OMAP platforms * * Copyright (C) 2006 Nokia Corporation * Author: Imre Deak <imre.deak@nokia.com> * * 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, write to the Free Software Foundation, Inc., * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include <linux/module.h> #include <linux/kernel.h> #include <linux/init.h> #include <linux/platform_device.h> #include <linux/bootmem.h> #include <asm/hardware.h> #include <asm/io.h> #include <asm/mach-types.h> #include <asm/mach/map.h> #include <asm/arch/board.h> #include <asm/arch/sram.h> #include <asm/arch/omapfb.h> #if defined(CONFIG_FB_OMAP) || defined(CONFIG_FB_OMAP_MODULE) static struct omapfb_platform_data omapfb_config; static int config_invalid; static int configured_regions; static u64 omap_fb_dma_mask = ~(u32)0; static struct platform_device omap_fb_device = { .name = "omapfb", .id = -1, .dev = { .dma_mask = &omap_fb_dma_mask, .coherent_dma_mask = ~(u32)0, .platform_data = &omapfb_config, }, .num_resources = 0, }; static inline int ranges_overlap(unsigned long start1, unsigned long size1, unsigned long start2, unsigned long size2) { return (start1 >= start2 && start1 < start2 + size2) || (start2 >= start1 && start2 < start1 + size1); } static inline int range_included(unsigned long start1, unsigned long size1, unsigned long start2, unsigned long size2) { return start1 >= start2 && start1 + size1 <= start2 + size2; } /* Check if there is an overlapping region. */ static int fbmem_region_reserved(unsigned long start, size_t size) { struct omapfb_mem_region *rg; int i; rg = &omapfb_config.mem_desc.region[0]; for (i = 0; i < OMAPFB_PLANE_NUM; i++, rg++) { if (!rg->paddr) /* Empty slot. */ continue; if (ranges_overlap(start, size, rg->paddr, rg->size)) return 1; } return 0; } /* * Get the region_idx`th region from board config/ATAG and convert it to * our internal format. */ static int get_fbmem_region(int region_idx, struct omapfb_mem_region *rg) { const struct omap_fbmem_config *conf; u32 paddr; conf = omap_get_nr_config(OMAP_TAG_FBMEM, struct omap_fbmem_config, region_idx); if (conf == NULL) return -ENOENT; paddr = conf->start; /* * Low bits encode the page allocation mode, if high bits * are zero. Otherwise we need a page aligned fixed * address. */ memset(rg, 0, sizeof(*rg)); rg->type = paddr & ~PAGE_MASK; rg->paddr = paddr & PAGE_MASK; rg->size = PAGE_ALIGN(conf->size); return 0; } static int set_fbmem_region_type(struct omapfb_mem_region *rg, int mem_type, unsigned long mem_start, unsigned long mem_size) { /* * Check if the configuration specifies the type explicitly. * type = 0 && paddr = 0, a default don't care case maps to * the SDRAM type. */ if (rg->type || (!rg->type && !rg->paddr)) return 0; if (ranges_overlap(rg->paddr, rg->size, mem_start, mem_size)) { rg->type = mem_type; return 0; } /* Can't determine it. */ return -1; } static int check_fbmem_region(int region_idx, struct omapfb_mem_region *rg, unsigned long start_avail, unsigned size_avail) { unsigned long paddr = rg->paddr; size_t size = rg->size; if (rg->type > OMAPFB_MEMTYPE_MAX) { printk(KERN_ERR "Invalid start address for FB region %d\n", region_idx); return -EINVAL; } if (!rg->size) { printk(KERN_ERR "Zero size for FB region %d\n", region_idx); return -EINVAL; } if (!paddr) /* Allocate this dynamically, leave paddr 0 for now. */ return 0; /* * Fixed region for the given RAM range. Check if it's already * reserved by the FB code or someone else. */ if (fbmem_region_reserved(paddr, size) || !range_included(paddr, size, start_avail, size_avail)) { printk(KERN_ERR "Trying to use reserved memory " "for FB region %d\n", region_idx); return -EINVAL; } return 0; } /* * Called from map_io. We need to call to this early enough so that we * can reserve the fixed SDRAM regions before VM could get hold of them. */ void __init omapfb_reserve_sdram(void) { struct bootmem_data *bdata; unsigned long sdram_start, sdram_size; unsigned long reserved; int i; if (config_invalid) return; bdata = NODE_DATA(0)->bdata; sdram_start = bdata->node_boot_start; sdram_size = (bdata->node_low_pfn << PAGE_SHIFT) - sdram_start; reserved = 0; for (i = 0; ; i++) { struct omapfb_mem_region rg; if (get_fbmem_region(i, &rg) < 0) break; if (i == OMAPFB_PLANE_NUM) { printk(KERN_ERR "Extraneous FB mem configuration entries\n"); config_invalid = 1; return; } /* Check if it's our memory type. */ if (set_fbmem_region_type(&rg, OMAPFB_MEMTYPE_SDRAM, sdram_start, sdram_size) < 0 || (rg.type != OMAPFB_MEMTYPE_SDRAM)) continue; BUG_ON(omapfb_config.mem_desc.region[i].size); if (check_fbmem_region(i, &rg, sdram_start, sdram_size) < 0) { config_invalid = 1; return; } if (rg.paddr) reserve_bootmem(rg.paddr, rg.size); reserved += rg.size; omapfb_config.mem_desc.region[i] = rg; configured_regions++; } omapfb_config.mem_desc.region_cnt = i; if (reserved) pr_info("Reserving %lu bytes SDRAM for frame buffer\n", reserved); } /* * Called at sram init time, before anything is pushed to the SRAM stack. * Because of the stack scheme, we will allocate everything from the * start of the lowest address region to the end of SRAM. This will also * include padding for page alignment and possible holes between regions. * * As opposed to the SDRAM case, we'll also do any dynamic allocations at * this point, since the driver built as a module would have problem with * freeing / reallocating the regions. */ unsigned long omapfb_reserve_sram(unsigned long sram_pstart, unsigned long sram_vstart, unsigned long sram_size, unsigned long pstart_avail, unsigned long size_avail) { struct omapfb_mem_region rg; unsigned long pend_avail; unsigned long reserved; int i; if (config_invalid) return 0; reserved = 0; pend_avail = pstart_avail + size_avail; for (i = 0; ; i++) { if (get_fbmem_region(i, &rg) < 0) break; if (i == OMAPFB_PLANE_NUM) { printk(KERN_ERR "Extraneous FB mem configuration entries\n"); config_invalid = 1; return 0; } /* Check if it's our memory type. */ if (set_fbmem_region_type(&rg, OMAPFB_MEMTYPE_SRAM, sram_pstart, sram_size) < 0 || (rg.type != OMAPFB_MEMTYPE_SRAM)) continue; BUG_ON(omapfb_config.mem_desc.region[i].size); if (check_fbmem_region(i, &rg, pstart_avail, size_avail) < 0) { config_invalid = 1; return 0; } if (!rg.paddr) { /* Dynamic allocation */ if ((size_avail & PAGE_MASK) < rg.size) { printk("Not enough SRAM for FB region %d\n", i); config_invalid = 1; return 0; } size_avail = (size_avail - rg.size) & PAGE_MASK; rg.paddr = pstart_avail + size_avail; } /* Reserve everything above the start of the region. */ if (pend_avail - rg.paddr > reserved) reserved = pend_avail - rg.paddr; size_avail = pend_avail - reserved - pstart_avail; /* * We have a kernel mapping for this already, so the * driver won't have to make one. */ rg.vaddr = (void *)(sram_vstart + rg.paddr - sram_pstart); omapfb_config.mem_desc.region[i] = rg; configured_regions++; } omapfb_config.mem_desc.region_cnt = i; if (reserved) pr_info("Reserving %lu bytes SRAM for frame buffer\n", reserved); return reserved; } void omapfb_set_ctrl_platform_data(void *data) { omapfb_config.ctrl_platform_data = data; } static inline int omap_init_fb(void) { const struct omap_lcd_config *conf; if (config_invalid) return 0; if (configured_regions != omapfb_config.mem_desc.region_cnt) { printk(KERN_ERR "Invalid FB mem configuration entries\n"); return 0; } conf = omap_get_config(OMAP_TAG_LCD, struct omap_lcd_config); if (conf == NULL) { if (configured_regions) /* FB mem config, but no LCD config? */ printk(KERN_ERR "Missing LCD configuration\n"); return 0; } omapfb_config.lcd = *conf; return platform_device_register(&omap_fb_device); } arch_initcall(omap_init_fb); #else void omapfb_reserve_sdram(void) {} unsigned long omapfb_reserve_sram(unsigned long sram_pstart, unsigned long sram_vstart, unsigned long sram_size, unsigned long start_avail, unsigned long size_avail) { return 0; } #endif
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