From 849369d6c66d3054688672f97d31fceb8e8230fb Mon Sep 17 00:00:00 2001 From: root Date: Fri, 25 Dec 2015 04:40:36 +0000 Subject: initial_commit --- arch/arm/plat-omap/fb.c | 421 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 421 insertions(+) create mode 100644 arch/arm/plat-omap/fb.c (limited to 'arch/arm/plat-omap/fb.c') diff --git a/arch/arm/plat-omap/fb.c b/arch/arm/plat-omap/fb.c new file mode 100644 index 00000000..c9e5d729 --- /dev/null +++ b/arch/arm/plat-omap/fb.c @@ -0,0 +1,421 @@ +/* + * File: arch/arm/plat-omap/fb.c + * + * Framebuffer device registration for TI OMAP platforms + * + * Copyright (C) 2006 Nokia Corporation + * Author: Imre Deak + * + * 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 +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +#include +#include + +#include "fb.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 __init 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->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 __init 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 int __init 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 int __init omap_init_fb(void) +{ + return platform_device_register(&omap_fb_device); +} + +arch_initcall(omap_init_fb); + +void omapfb_reserve_sdram_memblock(void) +{ +} + +unsigned long __init 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 __init 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 -- cgit v1.2.3