| /* |
| * 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/mm.h> |
| #include <linux/init.h> |
| #include <linux/platform_device.h> |
| #include <linux/memblock.h> |
| #include <linux/io.h> |
| #include <linux/omapfb.h> |
| |
| #include <mach/hardware.h> |
| #include <asm/mach/map.h> |
| |
| #include <plat/board.h> |
| #include <plat/sram.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, |
| }; |
| |
| void omapfb_set_platform_data(struct omapfb_platform_data *data) |
| { |
| } |
| |
| 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; |
| } |
| |
| static int valid_sdram(unsigned long addr, unsigned long size) |
| { |
| return memblock_is_region_memory(addr, size); |
| } |
| |
| static int reserve_sdram(unsigned long addr, unsigned long size) |
| { |
| if (memblock_is_region_reserved(addr, size)) |
| return -EBUSY; |
| if (memblock_reserve(addr, size)) |
| return -ENOMEM; |
| 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_memblock(void) |
| { |
| unsigned long reserved = 0; |
| int i; |
| |
| if (config_invalid) |
| return; |
| |
| for (i = 0; ; i++) { |
| struct omapfb_mem_region rg; |
| |
| if (get_fbmem_region(i, &rg) < 0) |
| break; |
| |
| if (i == OMAPFB_PLANE_NUM) { |
| pr_err("Extraneous FB mem configuration entries\n"); |
| config_invalid = 1; |
| return; |
| } |
| |
| /* Check if it's our memory type. */ |
| if (rg.type != OMAPFB_MEMTYPE_SDRAM) |
| continue; |
| |
| /* Check if the region falls within SDRAM */ |
| if (rg.paddr && !valid_sdram(rg.paddr, rg.size)) |
| continue; |
| |
| if (rg.size == 0) { |
| pr_err("Zero size for FB region %d\n", i); |
| config_invalid = 1; |
| return; |
| } |
| |
| if (rg.paddr) { |
| if (reserve_sdram(rg.paddr, rg.size)) { |
| pr_err("Trying to use reserved memory for FB region %d\n", |
| i); |
| config_invalid = 1; |
| return; |
| } |
| reserved += rg.size; |
| } |
| |
| if (omapfb_config.mem_desc.region[i].size) { |
| pr_err("FB region %d already set\n", i); |
| config_invalid = 1; |
| return; |
| } |
| |
| 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); |
| |
| #elif defined(CONFIG_FB_OMAP2) || defined(CONFIG_FB_OMAP2_MODULE) |
| |
| static u64 omap_fb_dma_mask = ~(u32)0; |
| static struct omapfb_platform_data omapfb_config; |
| |
| 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, |
| }; |
| |
| void omapfb_set_platform_data(struct omapfb_platform_data *data) |
| { |
| omapfb_config = *data; |
| } |
| |
| static inline int omap_init_fb(void) |
| { |
| return platform_device_register(&omap_fb_device); |
| } |
| |
| arch_initcall(omap_init_fb); |
| |
| void omapfb_reserve_sdram_memblock(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; |
| } |
| |
| #else |
| |
| void omapfb_set_platform_data(struct omapfb_platform_data *data) |
| { |
| } |
| |
| void omapfb_reserve_sdram_memblock(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 |