mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-06 21:24:29 +00:00
cd93d625fd
Move this uncommon header out of the common header. Signed-off-by: Simon Glass <sjg@chromium.org>
130 lines
3 KiB
C
130 lines
3 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Copyright (C) 2018 Arm Ltd
|
|
* Author: Liviu Dudau <liviu.dudau@foss.arm.com>
|
|
*
|
|
*/
|
|
#include <common.h>
|
|
#include <dm.h>
|
|
#include <malloc.h>
|
|
#include <dm/read.h>
|
|
#include <asm/io.h>
|
|
#include <linux/bitops.h>
|
|
#include <linux/delay.h>
|
|
#include <misc.h>
|
|
|
|
#define SYS_CFGDATA 0xa0
|
|
|
|
#define SYS_CFGCTRL 0xa4
|
|
#define SYS_CFGCTRL_START BIT(31)
|
|
#define SYS_CFGCTRL_WRITE BIT(30)
|
|
|
|
#define SYS_CFGSTAT 0xa8
|
|
#define SYS_CFGSTAT_ERR BIT(1)
|
|
#define SYS_CFGSTAT_COMPLETE BIT(0)
|
|
|
|
struct vexpress_config_sysreg {
|
|
phys_addr_t addr;
|
|
u32 site;
|
|
};
|
|
|
|
static int vexpress_config_exec(struct vexpress_config_sysreg *syscfg,
|
|
bool write, void *buf, int size)
|
|
{
|
|
u32 cmd, status, tries = 100;
|
|
|
|
cmd = (*(u32 *)buf) | SYS_CFGCTRL_START | (syscfg->site << 16);
|
|
|
|
if (!write) {
|
|
/* write a canary in the data register for reads */
|
|
writel(0xdeadbeef, syscfg->addr + SYS_CFGDATA);
|
|
} else {
|
|
cmd |= SYS_CFGCTRL_WRITE;
|
|
writel(((u32 *)buf)[1], syscfg->addr + SYS_CFGDATA);
|
|
}
|
|
writel(0, syscfg->addr + SYS_CFGSTAT);
|
|
writel(cmd, syscfg->addr + SYS_CFGCTRL);
|
|
|
|
/* completion of command takes ages, go to sleep (150us) */
|
|
do {
|
|
udelay(150);
|
|
status = readl(syscfg->addr + SYS_CFGSTAT);
|
|
if (status & SYS_CFGSTAT_ERR)
|
|
return -EFAULT;
|
|
} while (--tries && !(status & SYS_CFGSTAT_COMPLETE));
|
|
|
|
if (!tries)
|
|
return -ETIMEDOUT;
|
|
|
|
if (!write)
|
|
(*(u32 *)buf) = readl(syscfg->addr + SYS_CFGDATA);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int vexpress_config_read(struct udevice *dev,
|
|
int offset, void *buf, int size)
|
|
{
|
|
struct vexpress_config_sysreg *priv = dev_get_uclass_priv(dev);
|
|
|
|
if (size != sizeof(u32))
|
|
return -EINVAL;
|
|
|
|
return vexpress_config_exec(priv, false, buf, size);
|
|
}
|
|
|
|
static int vexpress_config_write(struct udevice *dev,
|
|
int offset, const void *buf, int size)
|
|
{
|
|
struct vexpress_config_sysreg *priv = dev_get_uclass_priv(dev);
|
|
|
|
if (size != sizeof(u32) * 2)
|
|
return -EINVAL;
|
|
|
|
return vexpress_config_exec(priv, true, (void *)buf, size);
|
|
}
|
|
|
|
static struct misc_ops vexpress_config_ops = {
|
|
.read = vexpress_config_read,
|
|
.write = vexpress_config_write,
|
|
};
|
|
|
|
static int vexpress_config_probe(struct udevice *dev)
|
|
{
|
|
struct ofnode_phandle_args args;
|
|
struct vexpress_config_sysreg *priv;
|
|
const char *prop;
|
|
int err, prop_size;
|
|
|
|
err = dev_read_phandle_with_args(dev, "arm,vexpress,config-bridge",
|
|
NULL, 0, 0, &args);
|
|
if (err)
|
|
return err;
|
|
|
|
prop = ofnode_get_property(args.node, "compatible", &prop_size);
|
|
if (!prop || (strncmp(prop, "arm,vexpress-sysreg", 19) != 0))
|
|
return -ENOENT;
|
|
|
|
priv = calloc(1, sizeof(*priv));
|
|
if (!priv)
|
|
return -ENOMEM;
|
|
|
|
dev->uclass_priv = priv;
|
|
priv->addr = ofnode_get_addr(args.node);
|
|
|
|
return dev_read_u32(dev, "arm,vexpress,site", &priv->site);
|
|
}
|
|
|
|
static const struct udevice_id vexpress_config_ids[] = {
|
|
{ .compatible = "arm,vexpress,config-bus" },
|
|
{ }
|
|
};
|
|
|
|
U_BOOT_DRIVER(vexpress_config_drv) = {
|
|
.name = "vexpress_config_bus",
|
|
.id = UCLASS_MISC,
|
|
.of_match = vexpress_config_ids,
|
|
.bind = dm_scan_fdt_dev,
|
|
.probe = vexpress_config_probe,
|
|
.ops = &vexpress_config_ops,
|
|
};
|