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MIPS: TXx9: Add SRAMC support

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Add a sysdev to access SRAM in TXx9 SoCs via sysfs.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Atsushi Nemoto
2009-05-25 22:04:02 +09:00
committed by Ralf Baechle
parent 05f94eebd5
commit c3b28ae260
8 changed files with 101 additions and 0 deletions
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84
arch/mips/txx9/generic/setup.c
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@@ -24,6 +24,7 @@
#include <linux/serial_core.h>
#include <linux/mtd/physmap.h>
#include <linux/leds.h>
#include <linux/sysdev.h>
#include <asm/bootinfo.h>
#include <asm/time.h>
#include <asm/reboot.h>
@@ -912,3 +913,86 @@ void __init txx9_aclc_init(unsigned long baseaddr, int irq,
platform_device_put(pdev);
#endif
}
static struct sysdev_class txx9_sramc_sysdev_class;
struct txx9_sramc_sysdev {
struct sys_device dev;
struct bin_attribute bindata_attr;
void __iomem *base;
};
static ssize_t txx9_sram_read(struct kobject *kobj,
struct bin_attribute *bin_attr,
char *buf, loff_t pos, size_t size)
{
struct txx9_sramc_sysdev *dev = bin_attr->private;
size_t ramsize = bin_attr->size;
if (pos >= ramsize)
return 0;
if (pos + size > ramsize)
size = ramsize - pos;
memcpy_fromio(buf, dev->base + pos, size);
return size;
}
static ssize_t txx9_sram_write(struct kobject *kobj,
struct bin_attribute *bin_attr,
char *buf, loff_t pos, size_t size)
{
struct txx9_sramc_sysdev *dev = bin_attr->private;
size_t ramsize = bin_attr->size;
if (pos >= ramsize)
return 0;
if (pos + size > ramsize)
size = ramsize - pos;
memcpy_toio(dev->base + pos, buf, size);
return size;
}
void __init txx9_sramc_init(struct resource *r)
{
struct txx9_sramc_sysdev *dev;
size_t size;
int err;
if (!txx9_sramc_sysdev_class.name) {
txx9_sramc_sysdev_class.name = "txx9_sram";
err = sysdev_class_register(&txx9_sramc_sysdev_class);
if (err) {
txx9_sramc_sysdev_class.name = NULL;
return;
}
}
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
if (!dev)
return;
size = resource_size(r);
dev->base = ioremap(r->start, size);
if (!dev->base)
goto exit;
dev->dev.cls = &txx9_sramc_sysdev_class;
dev->bindata_attr.attr.name = "bindata";
dev->bindata_attr.attr.mode = S_IRUSR | S_IWUSR;
dev->bindata_attr.read = txx9_sram_read;
dev->bindata_attr.write = txx9_sram_write;
dev->bindata_attr.size = size;
dev->bindata_attr.private = dev;
err = sysdev_register(&dev->dev);
if (err)
goto exit;
err = sysfs_create_bin_file(&dev->dev.kobj, &dev->bindata_attr);
if (err) {
sysdev_unregister(&dev->dev);
goto exit;
}
return;
exit:
if (dev) {
if (dev->base)
iounmap(dev->base);
kfree(dev);
}
}