+/*
+ * 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/bootmem.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;
.num_resources = 0,
};
-/* called from map_io */
-void omapfb_reserve_mem(void)
+static inline int ranges_overlap(unsigned long start1, unsigned long size1,
+ unsigned long start2, unsigned long size2)
{
- const struct omap_fbmem_config *fbmem_conf;
+ return (start1 >= start2 && start1 < start2 + size2) ||
+ (start2 >= start1 && start2 < start1 + size1);
+}
- omapfb_config.fbmem.fb_sram_start = omap_fb_sram_start;
- omapfb_config.fbmem.fb_sram_size = omap_fb_sram_size;
+static inline int range_included(unsigned long start1, unsigned long size1,
+ unsigned long start2, unsigned long size2)
+{
+ return start1 >= start2 && start1 + size1 <= start2 + size2;
+}
- fbmem_conf = omap_get_config(OMAP_TAG_FBMEM, struct omap_fbmem_config);
- if (fbmem_conf != NULL) {
- /* indicate that the bootloader already initialized the
- * fb device, so we'll skip that part in the fb driver
- */
- omapfb_config.fbmem.fb_sdram_start = fbmem_conf->fb_sdram_start;
- omapfb_config.fbmem.fb_sdram_size = fbmem_conf->fb_sdram_size;
- if (fbmem_conf->fb_sdram_size) {
- pr_info("Reserving %u bytes SDRAM for frame buffer\n",
- fbmem_conf->fb_sdram_size);
- reserve_bootmem(fbmem_conf->fb_sdram_start,
- fbmem_conf->fb_sdram_size);
+/* 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_min_pfn << PAGE_SHIFT;
+ 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, BOOTMEM_DEFAULT);
+ 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)
{
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 (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);
#else
-void omapfb_reserve_mem(void) {}
-
-#endif
+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
git.openpandora.org / pandora-kernel.git / blobdiff