Commit afedec18 authored by Tomi Valkeinen's avatar Tomi Valkeinen
Browse files

OMAP: Add VRAM manager



Add a Video RAM manager for OMAP 2 and 3 platforms. VRAM manager is used
to allocate large continuous blocks of SDRAM or SRAM. The features VRAM
manager has that are missing from dma_alloc_* functions are:

- Support for OMAP2's SRAM
- Allocate without ioremapping
- Allocate at defined physical addresses
- Allows larger VRAM area and larger allocations

The upcoming DSS2 uses VRAM manager.

VRAM area size can be defined in kernel config, board file or with
kernel boot parameters. Board file definition overrides kernel config,
and boot parameter overrides kernel config and board file.
Signed-off-by: default avatarTomi Valkeinen <tomi.valkeinen@nokia.com>
parent dadd2bb9
......@@ -33,6 +33,7 @@
#include <plat/sdrc.h>
#include <plat/gpmc.h>
#include <plat/serial.h>
#include <plat/vram.h>
#ifndef CONFIG_ARCH_OMAP4 /* FIXME: Remove this once clkdev is ready */
#include "clock.h"
......@@ -264,6 +265,7 @@ void __init omap2_map_common_io(void)
omap2_check_revision();
omap_sram_init();
omapfb_reserve_sdram();
omap_vram_reserve_sdram();
}
/*
......
/*
* VRAM manager for OMAP
*
* Copyright (C) 2009 Nokia Corporation
* Author: Tomi Valkeinen <tomi.valkeinen@nokia.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* 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.
*/
#ifndef __OMAP_VRAM_H__
#define __OMAP_VRAM_H__
#include <linux/types.h>
#define OMAP_VRAM_MEMTYPE_SDRAM 0
#define OMAP_VRAM_MEMTYPE_SRAM 1
#define OMAP_VRAM_MEMTYPE_MAX 1
extern int omap_vram_add_region(unsigned long paddr, size_t size);
extern int omap_vram_free(unsigned long paddr, size_t size);
extern int omap_vram_alloc(int mtype, size_t size, unsigned long *paddr);
extern int omap_vram_reserve(unsigned long paddr, size_t size);
extern void omap_vram_get_info(unsigned long *vram, unsigned long *free_vram,
unsigned long *largest_free_block);
#ifdef CONFIG_OMAP2_VRAM
extern void omap_vram_set_sdram_vram(u32 size, u32 start);
extern void omap_vram_set_sram_vram(u32 size, u32 start);
extern void omap_vram_reserve_sdram(void);
extern unsigned long omap_vram_reserve_sram(unsigned long sram_pstart,
unsigned long sram_vstart,
unsigned long sram_size,
unsigned long pstart_avail,
unsigned long size_avail);
#else
static inline void omap_vram_set_sdram_vram(u32 size, u32 start) { }
static inline void omap_vram_set_sram_vram(u32 size, u32 start) { }
static inline void omap_vram_reserve_sdram(void) { }
static inline unsigned long omap_vram_reserve_sram(unsigned long sram_pstart,
unsigned long sram_vstart,
unsigned long sram_size,
unsigned long pstart_avail,
unsigned long size_avail)
{
return 0;
}
#endif
#endif
......@@ -28,6 +28,7 @@
#include <plat/sram.h>
#include <plat/board.h>
#include <plat/cpu.h>
#include <plat/vram.h>
#include <plat/control.h>
......@@ -185,6 +186,13 @@ void __init omap_detect_sram(void)
omap_sram_start + SRAM_BOOTLOADER_SZ,
omap_sram_size - SRAM_BOOTLOADER_SZ);
omap_sram_size -= reserved;
reserved = omap_vram_reserve_sram(omap_sram_start, omap_sram_base,
omap_sram_size,
omap_sram_start + SRAM_BOOTLOADER_SZ,
omap_sram_size - SRAM_BOOTLOADER_SZ);
omap_sram_size -= reserved;
omap_sram_ceil = omap_sram_base + omap_sram_size;
}
......
......@@ -2164,6 +2164,7 @@ config FB_BROADSHEET
a bridge adapter.
source "drivers/video/omap/Kconfig"
source "drivers/video/omap2/Kconfig"
source "drivers/video/backlight/Kconfig"
source "drivers/video/display/Kconfig"
......
......@@ -124,6 +124,7 @@ obj-$(CONFIG_FB_SM501) += sm501fb.o
obj-$(CONFIG_FB_XILINX) += xilinxfb.o
obj-$(CONFIG_FB_SH_MOBILE_LCDC) += sh_mobile_lcdcfb.o
obj-$(CONFIG_FB_OMAP) += omap/
obj-y += omap2/
obj-$(CONFIG_XEN_FBDEV_FRONTEND) += xen-fbfront.o
obj-$(CONFIG_FB_CARMINE) += carminefb.o
obj-$(CONFIG_FB_MB862XX) += mb862xx/
......
config OMAP2_VRAM
bool
obj-$(CONFIG_OMAP2_VRAM) += vram.o
/*
* VRAM manager for OMAP
*
* Copyright (C) 2009 Nokia Corporation
* Author: Tomi Valkeinen <tomi.valkeinen@nokia.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* 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.
*/
/*#define DEBUG*/
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/list.h>
#include <linux/seq_file.h>
#include <linux/bootmem.h>
#include <linux/completion.h>
#include <linux/debugfs.h>
#include <linux/jiffies.h>
#include <linux/module.h>
#include <asm/setup.h>
#include <plat/sram.h>
#include <plat/vram.h>
#include <plat/dma.h>
#ifdef DEBUG
#define DBG(format, ...) pr_debug("VRAM: " format, ## __VA_ARGS__)
#else
#define DBG(format, ...)
#endif
#define OMAP2_SRAM_START 0x40200000
/* Maximum size, in reality this is smaller if SRAM is partially locked. */
#define OMAP2_SRAM_SIZE 0xa0000 /* 640k */
/* postponed regions are used to temporarily store region information at boot
* time when we cannot yet allocate the region list */
#define MAX_POSTPONED_REGIONS 10
static bool vram_initialized;
static int postponed_cnt;
static struct {
unsigned long paddr;
size_t size;
} postponed_regions[MAX_POSTPONED_REGIONS];
struct vram_alloc {
struct list_head list;
unsigned long paddr;
unsigned pages;
};
struct vram_region {
struct list_head list;
struct list_head alloc_list;
unsigned long paddr;
unsigned pages;
};
static DEFINE_MUTEX(region_mutex);
static LIST_HEAD(region_list);
static inline int region_mem_type(unsigned long paddr)
{
if (paddr >= OMAP2_SRAM_START &&
paddr < OMAP2_SRAM_START + OMAP2_SRAM_SIZE)
return OMAP_VRAM_MEMTYPE_SRAM;
else
return OMAP_VRAM_MEMTYPE_SDRAM;
}
static struct vram_region *omap_vram_create_region(unsigned long paddr,
unsigned pages)
{
struct vram_region *rm;
rm = kzalloc(sizeof(*rm), GFP_KERNEL);
if (rm) {
INIT_LIST_HEAD(&rm->alloc_list);
rm->paddr = paddr;
rm->pages = pages;
}
return rm;
}
#if 0
static void omap_vram_free_region(struct vram_region *vr)
{
list_del(&vr->list);
kfree(vr);
}
#endif
static struct vram_alloc *omap_vram_create_allocation(struct vram_region *vr,
unsigned long paddr, unsigned pages)
{
struct vram_alloc *va;
struct vram_alloc *new;
new = kzalloc(sizeof(*va), GFP_KERNEL);
if (!new)
return NULL;
new->paddr = paddr;
new->pages = pages;
list_for_each_entry(va, &vr->alloc_list, list) {
if (va->paddr > new->paddr)
break;
}
list_add_tail(&new->list, &va->list);
return new;
}
static void omap_vram_free_allocation(struct vram_alloc *va)
{
list_del(&va->list);
kfree(va);
}
int omap_vram_add_region(unsigned long paddr, size_t size)
{
struct vram_region *rm;
unsigned pages;
if (vram_initialized) {
DBG("adding region paddr %08lx size %d\n",
paddr, size);
size &= PAGE_MASK;
pages = size >> PAGE_SHIFT;
rm = omap_vram_create_region(paddr, pages);
if (rm == NULL)
return -ENOMEM;
list_add(&rm->list, &region_list);
} else {
if (postponed_cnt == MAX_POSTPONED_REGIONS)
return -ENOMEM;
postponed_regions[postponed_cnt].paddr = paddr;
postponed_regions[postponed_cnt].size = size;
++postponed_cnt;
}
return 0;
}
int omap_vram_free(unsigned long paddr, size_t size)
{
struct vram_region *rm;
struct vram_alloc *alloc;
unsigned start, end;
DBG("free mem paddr %08lx size %d\n", paddr, size);
size = PAGE_ALIGN(size);
mutex_lock(&region_mutex);
list_for_each_entry(rm, &region_list, list) {
list_for_each_entry(alloc, &rm->alloc_list, list) {
start = alloc->paddr;
end = alloc->paddr + (alloc->pages >> PAGE_SHIFT);
if (start >= paddr && end < paddr + size)
goto found;
}
}
mutex_unlock(&region_mutex);
return -EINVAL;
found:
omap_vram_free_allocation(alloc);
mutex_unlock(&region_mutex);
return 0;
}
EXPORT_SYMBOL(omap_vram_free);
static int _omap_vram_reserve(unsigned long paddr, unsigned pages)
{
struct vram_region *rm;
struct vram_alloc *alloc;
size_t size;
size = pages << PAGE_SHIFT;
list_for_each_entry(rm, &region_list, list) {
unsigned long start, end;
DBG("checking region %lx %d\n", rm->paddr, rm->pages);
if (region_mem_type(rm->paddr) != region_mem_type(paddr))
continue;
start = rm->paddr;
end = start + (rm->pages << PAGE_SHIFT) - 1;
if (start > paddr || end < paddr + size - 1)
continue;
DBG("block ok, checking allocs\n");
list_for_each_entry(alloc, &rm->alloc_list, list) {
end = alloc->paddr - 1;
if (start <= paddr && end >= paddr + size - 1)
goto found;
start = alloc->paddr + (alloc->pages << PAGE_SHIFT);
}
end = rm->paddr + (rm->pages << PAGE_SHIFT) - 1;
if (!(start <= paddr && end >= paddr + size - 1))
continue;
found:
DBG("found area start %lx, end %lx\n", start, end);
if (omap_vram_create_allocation(rm, paddr, pages) == NULL)
return -ENOMEM;
return 0;
}
return -ENOMEM;
}
int omap_vram_reserve(unsigned long paddr, size_t size)
{
unsigned pages;
int r;
DBG("reserve mem paddr %08lx size %d\n", paddr, size);
size = PAGE_ALIGN(size);
pages = size >> PAGE_SHIFT;
mutex_lock(&region_mutex);
r = _omap_vram_reserve(paddr, pages);
mutex_unlock(&region_mutex);
return r;
}
EXPORT_SYMBOL(omap_vram_reserve);
static void _omap_vram_dma_cb(int lch, u16 ch_status, void *data)
{
struct completion *compl = data;
complete(compl);
}
static int _omap_vram_clear(u32 paddr, unsigned pages)
{
struct completion compl;
unsigned elem_count;
unsigned frame_count;
int r;
int lch;
init_completion(&compl);
r = omap_request_dma(OMAP_DMA_NO_DEVICE, "VRAM DMA",
_omap_vram_dma_cb,
&compl, &lch);
if (r) {
pr_err("VRAM: request_dma failed for memory clear\n");
return -EBUSY;
}
elem_count = pages * PAGE_SIZE / 4;
frame_count = 1;
omap_set_dma_transfer_params(lch, OMAP_DMA_DATA_TYPE_S32,
elem_count, frame_count,
OMAP_DMA_SYNC_ELEMENT,
0, 0);
omap_set_dma_dest_params(lch, 0, OMAP_DMA_AMODE_POST_INC,
paddr, 0, 0);
omap_set_dma_color_mode(lch, OMAP_DMA_CONSTANT_FILL, 0x000000);
omap_start_dma(lch);
if (wait_for_completion_timeout(&compl, msecs_to_jiffies(1000)) == 0) {
omap_stop_dma(lch);
pr_err("VRAM: dma timeout while clearing memory\n");
r = -EIO;
goto err;
}
r = 0;
err:
omap_free_dma(lch);
return r;
}
static int _omap_vram_alloc(int mtype, unsigned pages, unsigned long *paddr)
{
struct vram_region *rm;
struct vram_alloc *alloc;
list_for_each_entry(rm, &region_list, list) {
unsigned long start, end;
DBG("checking region %lx %d\n", rm->paddr, rm->pages);
if (region_mem_type(rm->paddr) != mtype)
continue;
start = rm->paddr;
list_for_each_entry(alloc, &rm->alloc_list, list) {
end = alloc->paddr;
if (end - start >= pages << PAGE_SHIFT)
goto found;
start = alloc->paddr + (alloc->pages << PAGE_SHIFT);
}
end = rm->paddr + (rm->pages << PAGE_SHIFT);
found:
if (end - start < pages << PAGE_SHIFT)
continue;
DBG("found %lx, end %lx\n", start, end);
alloc = omap_vram_create_allocation(rm, start, pages);
if (alloc == NULL)
return -ENOMEM;
*paddr = start;
_omap_vram_clear(start, pages);
return 0;
}
return -ENOMEM;
}
int omap_vram_alloc(int mtype, size_t size, unsigned long *paddr)
{
unsigned pages;
int r;
BUG_ON(mtype > OMAP_VRAM_MEMTYPE_MAX || !size);
DBG("alloc mem type %d size %d\n", mtype, size);
size = PAGE_ALIGN(size);
pages = size >> PAGE_SHIFT;
mutex_lock(&region_mutex);
r = _omap_vram_alloc(mtype, pages, paddr);
mutex_unlock(&region_mutex);
return r;
}
EXPORT_SYMBOL(omap_vram_alloc);
void omap_vram_get_info(unsigned long *vram,
unsigned long *free_vram,
unsigned long *largest_free_block)
{
struct vram_region *vr;
struct vram_alloc *va;
*vram = 0;
*free_vram = 0;
*largest_free_block = 0;
mutex_lock(&region_mutex);
list_for_each_entry(vr, &region_list, list) {
unsigned free;
unsigned long pa;
pa = vr->paddr;
*vram += vr->pages << PAGE_SHIFT;
list_for_each_entry(va, &vr->alloc_list, list) {
free = va->paddr - pa;
*free_vram += free;
if (free > *largest_free_block)
*largest_free_block = free;
pa = va->paddr + (va->pages << PAGE_SHIFT);
}
free = vr->paddr + (vr->pages << PAGE_SHIFT) - pa;
*free_vram += free;
if (free > *largest_free_block)
*largest_free_block = free;
}
mutex_unlock(&region_mutex);
}
EXPORT_SYMBOL(omap_vram_get_info);
#if defined(CONFIG_DEBUG_FS)
static int vram_debug_show(struct seq_file *s, void *unused)
{
struct vram_region *vr;
struct vram_alloc *va;
unsigned size;
mutex_lock(&region_mutex);
list_for_each_entry(vr, &region_list, list) {
size = vr->pages << PAGE_SHIFT;
seq_printf(s, "%08lx-%08lx (%d bytes)\n",
vr->paddr, vr->paddr + size - 1,
size);
list_for_each_entry(va, &vr->alloc_list, list) {
size = va->pages << PAGE_SHIFT;
seq_printf(s, " %08lx-%08lx (%d bytes)\n",
va->paddr, va->paddr + size - 1,
size);
}
}
mutex_unlock(&region_mutex);
return 0;
}
static int vram_debug_open(struct inode *inode, struct file *file)
{
return single_open(file, vram_debug_show, inode->i_private);
}
static const struct file_operations vram_debug_fops = {
.open = vram_debug_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int __init omap_vram_create_debugfs(void)
{
struct dentry *d;
d = debugfs_create_file("vram", S_IRUGO, NULL,
NULL, &vram_debug_fops);
if (IS_ERR(d))
return PTR_ERR(d);
return 0;
}
#endif
static __init int omap_vram_init(void)
{
int i;
vram_initialized = 1;
for (i = 0; i < postponed_cnt; i++)
omap_vram_add_region(postponed_regions[i].paddr,
postponed_regions[i].size);
#ifdef CONFIG_DEBUG_FS
if (omap_vram_create_debugfs())
pr_err("VRAM: Failed to create debugfs file\n");
#endif
return 0;
}
arch_initcall(omap_vram_init);
/* boottime vram alloc stuff */
/* set from board file */
static u32 omap_vram_sram_start __initdata;
static u32 omap_vram_sram_size __initdata;
/* set from board file */