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/*
* Copyright (c) 2006-2023, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2023-02-25 GuEe-GUI the first version
*/
#include <rthw.h>
#include <rtthread.h>
#include <ioremap.h>
#include <drivers/ofw_io.h>
#include <drivers/syscon.h>
#include <drivers/core/dm.h>
#include <drivers/platform.h>
static RT_DEFINE_SPINLOCK(_syscon_nodes_lock);
static rt_list_t _syscon_nodes = RT_LIST_OBJECT_INIT(_syscon_nodes);
rt_err_t rt_syscon_read(struct rt_syscon *syscon, rt_off_t offset, rt_uint32_t *out_val)
{
if (offset < syscon->iomem_size)
{
rt_ubase_t level = rt_spin_lock_irqsave(&syscon->rw_lock);
*out_val = HWREG32(syscon->iomem_base + offset);
rt_spin_unlock_irqrestore(&syscon->rw_lock, level);
return RT_EOK;
}
else
{
return -RT_EINVAL;
}
}
rt_err_t rt_syscon_write(struct rt_syscon *syscon, rt_off_t offset, rt_uint32_t val)
{
if (offset < syscon->iomem_size)
{
rt_ubase_t level = rt_spin_lock_irqsave(&syscon->rw_lock);
HWREG32(syscon->iomem_base + offset) = val;
rt_spin_unlock_irqrestore(&syscon->rw_lock, level);
return RT_EOK;
}
else
{
return -RT_EINVAL;
}
}
rt_err_t rt_syscon_update_bits(struct rt_syscon *syscon, rt_off_t offset, rt_uint32_t mask, rt_uint32_t val)
{
rt_err_t err;
rt_ubase_t level = rt_spin_lock_irqsave(&syscon->rw_lock);
if (offset < syscon->iomem_size)
{
rt_uint32_t old_val = HWREG32(syscon->iomem_base + offset);
old_val &= ~mask;
HWREG32(syscon->iomem_base + offset) = old_val | val;
err = RT_EOK;
}
else
{
err = -RT_EINVAL;
}
rt_spin_unlock_irqrestore(&syscon->rw_lock, level);
return err;
}
static rt_err_t syscon_probe(struct rt_platform_device *pdev);
struct rt_syscon *rt_syscon_find_by_ofw_node(struct rt_ofw_node *np)
{
rt_ubase_t level;
struct rt_syscon *syscon = RT_NULL, *syscon_tmp;
struct rt_platform_device syscon_pdev;
if (!np)
{
goto _exit;
}
level = rt_spin_lock_irqsave(&_syscon_nodes_lock);
/* ofw_data is not safety */
rt_list_for_each_entry(syscon_tmp, &_syscon_nodes, list)
{
if (syscon_tmp->np == np)
{
syscon = syscon_tmp;
break;
}
}
rt_spin_unlock_irqrestore(&_syscon_nodes_lock, level);
if (syscon)
{
goto _exit;
}
/* Not found, try probe this node */
if (!rt_ofw_node_is_compatible(np, "syscon") &&
!rt_ofw_node_is_compatible(np, "simple-mfd"))
{
goto _exit;
}
syscon_pdev.parent.ofw_node = np;
if (!syscon_probe(&syscon_pdev))
{
syscon = rt_ofw_data(np);
}
_exit:
return syscon;
}
struct rt_syscon *rt_syscon_find_by_ofw_compatible(const char *compatible)
{
struct rt_syscon *syscon = RT_NULL;
struct rt_ofw_node *syscon_np = rt_ofw_find_node_by_compatible(RT_NULL, compatible);
if (syscon_np)
{
syscon = rt_syscon_find_by_ofw_node(syscon_np);
rt_ofw_node_put(syscon_np);
}
return syscon;
}
struct rt_syscon *rt_syscon_find_by_ofw_phandle(struct rt_ofw_node *np, const char *propname)
{
struct rt_syscon *syscon = RT_NULL;
struct rt_ofw_node *syscon_np = rt_ofw_parse_phandle(np, propname, 0);
if (syscon_np)
{
syscon = rt_syscon_find_by_ofw_node(syscon_np);
rt_ofw_node_put(syscon_np);
}
return syscon;
}
static rt_err_t syscon_probe(struct rt_platform_device *pdev)
{
rt_err_t err;
rt_ubase_t level;
struct rt_ofw_node *np;
rt_uint64_t iomem_range[2];
struct rt_syscon *syscon = rt_calloc(1, sizeof(*syscon));
if (!syscon)
{
return -RT_ENOMEM;
}
np = pdev->parent.ofw_node;
if ((err = rt_ofw_get_address(np, 0, &iomem_range[0], &iomem_range[1])))
{
goto _fail;
}
syscon->iomem_size = (rt_size_t)iomem_range[1];
syscon->iomem_base = rt_ioremap((void *)iomem_range[0], syscon->iomem_size);
if (!syscon->iomem_base)
{
goto _fail;
}
rt_list_init(&syscon->list);
level = rt_spin_lock_irqsave(&_syscon_nodes_lock);
rt_list_insert_after(&_syscon_nodes, &syscon->list);
rt_spin_unlock_irqrestore(&_syscon_nodes_lock, level);
rt_spin_lock_init(&syscon->rw_lock);
pdev->parent.user_data = syscon;
syscon->np = pdev->parent.ofw_node;
rt_ofw_data(np) = syscon;
return RT_EOK;
_fail:
rt_free(syscon);
return err;
}
static rt_err_t syscon_remove(struct rt_platform_device *pdev)
{
struct rt_syscon *syscon = pdev->parent.user_data;
rt_iounmap(syscon->iomem_base);
rt_free(syscon);
return RT_EOK;
}
static const struct rt_ofw_node_id syscon_ofw_ids[] =
{
{ .compatible = "syscon" },
{ /* sentinel */ }
};
static struct rt_platform_driver syscon_driver =
{
.name = "mfd-syscon",
.ids = syscon_ofw_ids,
.probe = syscon_probe,
.remove = syscon_remove,
};
static int syscon_drv_register(void)
{
rt_platform_driver_register(&syscon_driver);
return 0;
}
INIT_SUBSYS_EXPORT(syscon_drv_register);
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