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/*
* Copyright 2016 IBM Corporation
*
* 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.
*/
#include <linux/init.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <linux/debugfs.h>
#include <linux/slab.h>
#include <asm/mach-types.h>
#include <asm/mach/arch.h>
#include <asm/mach/map.h>
#define AST_IO_VA 0xf0000000
#define AST_IO_PA 0x1e600000
#define AST_IO_SZ 0x00200000
#define AST_IO(__pa) ((void __iomem *)(((__pa) & 0x001fffff) | AST_IO_VA))
struct aspeed_controller {
struct device *dev;
const char *name;
unsigned int base;
unsigned int nregs;
};
static ssize_t aspeed_read(struct file *filp, char __user *ubuf,
size_t count, loff_t *ppos)
{
struct aspeed_controller *ctrl = filp->private_data;
char *kbuf;
int ret, n = 0;
size_t size;
int i;
size = ctrl->nregs * 23 + 1;
kbuf = kzalloc(size, GFP_KERNEL);
if (!kbuf)
return -ENOMEM;
for (i = 0; i < ctrl->nregs; i += 4) {
n += scnprintf(kbuf + n, size - n, "0x%08X: 0x%08X\n",
ctrl->base | i, readl(AST_IO(ctrl->base | i)));
}
ret = simple_read_from_buffer(ubuf, count, ppos, kbuf, n);
kfree(kbuf);
return ret;
}
static ssize_t aspeed_write(struct file *filp, const char __user *ubuf,
size_t count, loff_t *ppos)
{
struct aspeed_controller *ctrl = filp->private_data;
unsigned int reg, val;
char *kbuf = kmalloc(count + 1, GFP_KERNEL);
int ret;
if (!kbuf)
return -ENOMEM;
ret = simple_write_to_buffer(kbuf, count, ppos, ubuf, count);
if (ret != count) {
kfree(kbuf);
return ret >= 0 ? -EIO : ret;
}
kbuf[count] = '\0';
ret = sscanf(kbuf, "%x=%x", ®, &val);
kfree(kbuf);
if (ret != 2)
return -EINVAL;
if ((ctrl->base & reg) != ctrl->base) {
dev_err(ctrl->dev, "wrong base address: %x\n", reg);
return -EINVAL;
}
if ((~ctrl->base & reg) >= ctrl->nregs) {
dev_err(ctrl->dev, "wrong register: %x\n", reg);
return -EINVAL;
}
writel(val, AST_IO(reg));
return count;
}
static const struct file_operations aspeed_fops = {
.open = simple_open,
.read = aspeed_read,
.write = aspeed_write,
.llseek = generic_file_llseek,
};
static struct dentry *aspeed_debugfs_root;
static int aspeed_device_show(struct device *dev, void *data)
{
struct platform_device *pdev = to_platform_device(dev);
struct aspeed_controller *ctrl;
struct resource *r;
if (!pdev)
return 0;
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!r)
return 0;
ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
if (!ctrl)
return -ENOMEM;
ctrl->dev = dev;
ctrl->name = pdev->name;
ctrl->base = r->start;
ctrl->nregs = resource_size(r);
debugfs_create_file(pdev->name, 0600, aspeed_debugfs_root,
ctrl, &aspeed_fops);
return 0;
}
static int __init aspeed_debugfs_init(void)
{
aspeed_debugfs_root = debugfs_create_dir("aspeed", NULL);
bus_for_each_dev(&platform_bus_type, NULL, NULL, aspeed_device_show);
return 0;
}
arch_initcall(aspeed_debugfs_init);
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