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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 <rtthread.h>
#include <rtdevice.h>
#define DBG_TAG "nvmem.raspberrypi"
#define DBG_LVL DBG_INFO
#include <rtdbg.h>
#include <firmware-raspberrypi.h>
#define MAX_ROWS 192
struct rpi_otp
{
struct rt_nvmem_device parent;
struct rpi_firmware *fw;
rt_uint32_t block;
};
#define raw_to_rpi_otp(raw) rt_container_of(raw, struct rpi_otp, parent)
static rt_ssize_t rpi_otp_read(struct rt_nvmem_device *ndev, int offset,
void *val, rt_size_t bytes)
{
rt_err_t err;
int words, index;
rt_uint32_t data[3 + MAX_ROWS];
struct rpi_otp *otp = raw_to_rpi_otp(ndev);
words = bytes / sizeof(rt_uint32_t);
index = offset / sizeof(rt_uint32_t);
data[0] = otp->block;
data[1] = index;
data[2] = words;
if (words > MAX_ROWS)
{
return -RT_EINVAL;
}
err = rpi_firmware_property(otp->fw, RPI_FIRMWARE_GET_USER_OTP, &data, sizeof(data));
if (!err)
{
rt_memcpy(val, data + 3, bytes);
}
else
{
rt_memset(val, 0xee, bytes);
}
return err ? : bytes;
}
static rt_ssize_t rpi_otp_write(struct rt_nvmem_device *ndev, int offset,
void *val, rt_size_t bytes)
{
int words, index;
rt_uint32_t data[3 + MAX_ROWS];
struct rpi_otp *otp = raw_to_rpi_otp(ndev);
words = bytes / sizeof(rt_uint32_t);
index = offset / sizeof(rt_uint32_t);
data[0] = otp->block;
data[1] = index;
data[2] = words;
if (bytes > MAX_ROWS * sizeof(rt_uint32_t))
{
return -RT_EINVAL;
}
rt_memcpy(data + 3, val, bytes);
return rpi_firmware_property(otp->fw, RPI_FIRMWARE_SET_USER_OTP, &data, sizeof(data)) ? : bytes;
}
static rt_err_t rpi_otp_probe(struct rt_platform_device *pdev)
{
rt_err_t err;
rt_uint32_t reg[2];
struct rt_nvmem_device *nvmem;
struct rt_device *dev = &pdev->parent;
struct rt_ofw_node *np = dev->ofw_node, *fw_np;
struct rpi_otp *otp = rt_calloc(1, sizeof(*otp));
if (!otp)
{
return -RT_ENOMEM;
}
fw_np = rt_ofw_parse_phandle(np, "firmware", 0);
if (!fw_np)
{
err = -RT_EINVAL;
goto _fail;
}
otp->fw = rpi_firmware_get(fw_np);
rt_ofw_node_put(fw_np);
if (!otp->fw)
{
err = -RT_EINVAL;
goto _fail;
}
if (rt_dm_dev_prop_read_u32_array_index(dev, "reg", 0, RT_ARRAY_SIZE(reg), reg) <= 0)
{
err = -RT_EINVAL;
goto _fail;
}
nvmem = &otp->parent;
nvmem->parent.ofw_node = np;
nvmem->reg_read = rpi_otp_read,
nvmem->reg_write = rpi_otp_write,
nvmem->size = reg[1] * sizeof(rt_uint32_t);
nvmem->read_only = !rt_dm_dev_prop_read_bool(dev, "rw");
nvmem->stride = sizeof(rt_uint32_t);
nvmem->word_size = sizeof(rt_uint32_t);
if ((err = rt_nvmem_device_register(nvmem)))
{
goto _fail;
}
return RT_EOK;
_fail:
if (otp->fw)
{
rpi_firmware_put(otp->fw);
}
rt_free(otp);
return err;
}
static rt_err_t rpi_otp_remove(struct rt_platform_device *pdev)
{
rt_err_t err;
struct rpi_otp *otp = pdev->parent.user_data;
err = rt_nvmem_device_unregister(&otp->parent);
rpi_firmware_put(otp->fw);
rt_free(otp);
return err;
}
static const struct rt_ofw_node_id rpi_top_ofw_ids[] =
{
{ .compatible = "raspberrypi,rpi-otp", },
{ /* sentinel */ }
};
static struct rt_platform_driver rpi_top_driver =
{
.name = "nvmem-raspberrypi-otp",
.ids = rpi_top_ofw_ids,
.probe = rpi_otp_probe,
.remove = rpi_otp_remove,
};
RT_PLATFORM_DRIVER_EXPORT(rpi_top_driver);
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