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/*
* Copyright (c) 2006-2022, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2022-11-26 GuEe-GUI first version
*/
#include <rtthread.h>
#include <rtdevice.h>
#define DBG_TAG "reset.brcmstb-rescal"
#define DBG_LVL DBG_INFO
#include <rtdbg.h>
#include <cpuport.h>
#define BRCM_RESCAL_START 0x0
#define BRCM_RESCAL_START_BIT RT_BIT(0)
#define BRCM_RESCAL_CTRL 0x4
#define BRCM_RESCAL_STATUS 0x8
#define BRCM_RESCAL_STATUS_BIT RT_BIT(0)
struct brcm_rescal_reset
{
struct rt_reset_controller parent;
void *regs;
};
static rt_err_t brcm_rescal_reset_ofw_parse(struct rt_reset_control *rstc, struct rt_ofw_cell_args *args)
{
args->args[0] = 0;
return RT_EOK;
}
static rt_err_t brcm_rescal_reset_reset(struct rt_reset_control *rstc)
{
rt_uint32_t reg;
struct brcm_rescal_reset *brrst = rstc->rstcer->priv;
reg = HWREG32(brrst->regs + BRCM_RESCAL_START);
HWREG32(brrst->regs + BRCM_RESCAL_START) = reg | BRCM_RESCAL_START_BIT;
reg = HWREG32(brrst->regs + BRCM_RESCAL_START);
if (!(reg & BRCM_RESCAL_START_BIT))
{
LOG_E("Failed to start SATA/PCIe rescal");
return -RT_EIO;
}
for (rt_uint32_t time = 0; time < 1000; time += 100)
{
reg = HWREG32(brrst->regs + BRCM_RESCAL_STATUS);
if (reg & BRCM_RESCAL_STATUS_BIT)
{
goto _status_ok;
}
rt_hw_us_delay(100);
rt_hw_cpu_relax();
}
LOG_E("Time out on SATA/PCIe rescal");
return -RT_ETIMEOUT;
_status_ok:
reg = HWREG32(brrst->regs + BRCM_RESCAL_START);
HWREG32(brrst->regs + BRCM_RESCAL_START) = reg & ~BRCM_RESCAL_START_BIT;
LOG_D("SATA/PCIe rescal success");
return RT_EOK;
}
static rt_err_t brcm_rescal_reset_assert(struct rt_reset_control *rstc)
{
return RT_EOK;
}
static rt_err_t brcm_rescal_reset_deassert(struct rt_reset_control *rstc)
{
return brcm_rescal_reset_reset(rstc);
}
const static struct rt_reset_control_ops brcm_rescal_reset_ops =
{
.ofw_parse = brcm_rescal_reset_ofw_parse,
.reset = brcm_rescal_reset_reset,
.assert = brcm_rescal_reset_assert,
.deassert = brcm_rescal_reset_deassert,
};
static rt_err_t brcm_rescal_reset_probe(struct rt_platform_device *pdev)
{
rt_err_t err;
struct rt_reset_controller *rstcer;
struct rt_device *dev = &pdev->parent;
struct brcm_rescal_reset *brrst = rt_calloc(1, sizeof(*brrst));
if (!brrst)
{
return -RT_ENOMEM;
}
brrst->regs = rt_dm_dev_iomap(dev, 0);
if (!brrst->regs)
{
err = -RT_EIO;
goto _fail;
}
rstcer = &brrst->parent;
rstcer->priv = brrst;
rstcer->ofw_node = dev->ofw_node;
rstcer->ops = &brcm_rescal_reset_ops;
if ((err = rt_reset_controller_register(rstcer)))
{
goto _fail;
}
return RT_EOK;
_fail:
if (brrst->regs)
{
rt_iounmap(brrst->regs);
}
rt_free(brrst);
return err;
}
static const struct rt_ofw_node_id brcm_rescal_reset_ofw_ids[] =
{
{ .compatible = "brcm,bcm7216-pcie-sata-rescal" },
{ /* sentinel */ }
};
static struct rt_platform_driver brcm_rescal_reset_driver =
{
.name = "reset-brcm-rescal",
.ids = brcm_rescal_reset_ofw_ids,
.probe = brcm_rescal_reset_probe,
};
static int brcm_rescal_reset_register(void)
{
rt_platform_driver_register(&brcm_rescal_reset_driver);
return 0;
}
INIT_SUBSYS_EXPORT(brcm_rescal_reset_register);
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