mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-21 01:18:52 +09:00
![Simon Glass](/assets/img/avatar_default.png)
This function name conflicts with our desire to #define free() to something else on sandbox. Since it deals with resources, rename it to rfree(). Signed-off-by: Simon Glass <sjg@chromium.org>
168 lines
4.2 KiB
C
168 lines
4.2 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Socfpga Reset Controller Driver
|
|
*
|
|
* Copyright 2014 Steffen Trumtrar <s.trumtrar@pengutronix.de>
|
|
*
|
|
* based on
|
|
* Allwinner SoCs Reset Controller driver
|
|
*
|
|
* Copyright 2013 Maxime Ripard
|
|
*
|
|
* Maxime Ripard <maxime.ripard@free-electrons.com>
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <dm.h>
|
|
#include <dm/lists.h>
|
|
#include <dm/of_access.h>
|
|
#include <env.h>
|
|
#include <reset-uclass.h>
|
|
#include <linux/bitops.h>
|
|
#include <linux/io.h>
|
|
#include <linux/sizes.h>
|
|
|
|
#define BANK_INCREMENT 4
|
|
#define NR_BANKS 8
|
|
|
|
struct socfpga_reset_data {
|
|
void __iomem *modrst_base;
|
|
};
|
|
|
|
/*
|
|
* For compatibility with Kernels that don't support peripheral reset, this
|
|
* driver can keep the old behaviour of not asserting peripheral reset before
|
|
* starting the OS and deasserting all peripheral resets (enabling all
|
|
* peripherals).
|
|
*
|
|
* For that, the reset driver checks the environment variable
|
|
* "socfpga_legacy_reset_compat". If this variable is '1', perihperals are not
|
|
* reset again once taken out of reset and all peripherals in 'permodrst' are
|
|
* taken out of reset before booting into the OS.
|
|
* Note that this should be required for gen5 systems only that are running
|
|
* Linux kernels without proper peripheral reset support for all drivers used.
|
|
*/
|
|
static bool socfpga_reset_keep_enabled(void)
|
|
{
|
|
#if !defined(CONFIG_SPL_BUILD) || CONFIG_IS_ENABLED(ENV_SUPPORT)
|
|
const char *env_str;
|
|
long val;
|
|
|
|
env_str = env_get("socfpga_legacy_reset_compat");
|
|
if (env_str) {
|
|
val = simple_strtol(env_str, NULL, 0);
|
|
if (val == 1)
|
|
return true;
|
|
}
|
|
#endif
|
|
|
|
return false;
|
|
}
|
|
|
|
static int socfpga_reset_assert(struct reset_ctl *reset_ctl)
|
|
{
|
|
struct socfpga_reset_data *data = dev_get_priv(reset_ctl->dev);
|
|
int id = reset_ctl->id;
|
|
int reg_width = sizeof(u32);
|
|
int bank = id / (reg_width * BITS_PER_BYTE);
|
|
int offset = id % (reg_width * BITS_PER_BYTE);
|
|
|
|
setbits_le32(data->modrst_base + (bank * BANK_INCREMENT), BIT(offset));
|
|
return 0;
|
|
}
|
|
|
|
static int socfpga_reset_deassert(struct reset_ctl *reset_ctl)
|
|
{
|
|
struct socfpga_reset_data *data = dev_get_priv(reset_ctl->dev);
|
|
int id = reset_ctl->id;
|
|
int reg_width = sizeof(u32);
|
|
int bank = id / (reg_width * BITS_PER_BYTE);
|
|
int offset = id % (reg_width * BITS_PER_BYTE);
|
|
|
|
clrbits_le32(data->modrst_base + (bank * BANK_INCREMENT), BIT(offset));
|
|
return 0;
|
|
}
|
|
|
|
static int socfpga_reset_request(struct reset_ctl *reset_ctl)
|
|
{
|
|
debug("%s(reset_ctl=%p) (dev=%p, id=%lu)\n", __func__,
|
|
reset_ctl, reset_ctl->dev, reset_ctl->id);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int socfpga_reset_free(struct reset_ctl *reset_ctl)
|
|
{
|
|
debug("%s(reset_ctl=%p) (dev=%p, id=%lu)\n", __func__, reset_ctl,
|
|
reset_ctl->dev, reset_ctl->id);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct reset_ops socfpga_reset_ops = {
|
|
.request = socfpga_reset_request,
|
|
.rfree = socfpga_reset_free,
|
|
.rst_assert = socfpga_reset_assert,
|
|
.rst_deassert = socfpga_reset_deassert,
|
|
};
|
|
|
|
static int socfpga_reset_probe(struct udevice *dev)
|
|
{
|
|
struct socfpga_reset_data *data = dev_get_priv(dev);
|
|
u32 modrst_offset;
|
|
void __iomem *membase;
|
|
|
|
membase = devfdt_get_addr_ptr(dev);
|
|
|
|
modrst_offset = dev_read_u32_default(dev, "altr,modrst-offset", 0x10);
|
|
data->modrst_base = membase + modrst_offset;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int socfpga_reset_remove(struct udevice *dev)
|
|
{
|
|
struct socfpga_reset_data *data = dev_get_priv(dev);
|
|
|
|
if (socfpga_reset_keep_enabled()) {
|
|
puts("Deasserting all peripheral resets\n");
|
|
writel(0, data->modrst_base + 4);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int socfpga_reset_bind(struct udevice *dev)
|
|
{
|
|
int ret;
|
|
struct udevice *sys_child;
|
|
|
|
/*
|
|
* The sysreset driver does not have a device node, so bind it here.
|
|
* Bind it to the node, too, so that it can get its base address.
|
|
*/
|
|
ret = device_bind_driver_to_node(dev, "socfpga_sysreset", "sysreset",
|
|
dev->node, &sys_child);
|
|
if (ret)
|
|
debug("Warning: No sysreset driver: ret=%d\n", ret);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct udevice_id socfpga_reset_match[] = {
|
|
{ .compatible = "altr,rst-mgr" },
|
|
{ /* sentinel */ },
|
|
};
|
|
|
|
U_BOOT_DRIVER(socfpga_reset) = {
|
|
.name = "socfpga-reset",
|
|
.id = UCLASS_RESET,
|
|
.of_match = socfpga_reset_match,
|
|
.bind = socfpga_reset_bind,
|
|
.probe = socfpga_reset_probe,
|
|
.priv_auto_alloc_size = sizeof(struct socfpga_reset_data),
|
|
.ops = &socfpga_reset_ops,
|
|
.remove = socfpga_reset_remove,
|
|
.flags = DM_FLAG_OS_PREPARE,
|
|
};
|