forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
156 lines
3.7 KiB
156 lines
3.7 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* |
|
* Copyright (c) 2015 Pengutronix, Steffen Trumtrar <[email protected]> |
|
* Copyright (c) 2017 Pengutronix, Oleksij Rempel <[email protected]> |
|
*/ |
|
|
|
#include <linux/mfd/syscon.h> |
|
#include <linux/module.h> |
|
#include <linux/nvmem-provider.h> |
|
#include <linux/of_device.h> |
|
#include <linux/regmap.h> |
|
|
|
#define IMX6Q_SNVS_HPLR 0x00 |
|
#define IMX6Q_SNVS_LPLR 0x34 |
|
#define IMX6Q_SNVS_LPGPR 0x68 |
|
|
|
#define IMX7D_SNVS_HPLR 0x00 |
|
#define IMX7D_SNVS_LPLR 0x34 |
|
#define IMX7D_SNVS_LPGPR 0x90 |
|
|
|
#define IMX_GPR_SL BIT(5) |
|
#define IMX_GPR_HL BIT(5) |
|
|
|
struct snvs_lpgpr_cfg { |
|
int offset; |
|
int offset_hplr; |
|
int offset_lplr; |
|
int size; |
|
}; |
|
|
|
struct snvs_lpgpr_priv { |
|
struct device_d *dev; |
|
struct regmap *regmap; |
|
struct nvmem_config cfg; |
|
const struct snvs_lpgpr_cfg *dcfg; |
|
}; |
|
|
|
static const struct snvs_lpgpr_cfg snvs_lpgpr_cfg_imx6q = { |
|
.offset = IMX6Q_SNVS_LPGPR, |
|
.offset_hplr = IMX6Q_SNVS_HPLR, |
|
.offset_lplr = IMX6Q_SNVS_LPLR, |
|
.size = 4, |
|
}; |
|
|
|
static const struct snvs_lpgpr_cfg snvs_lpgpr_cfg_imx7d = { |
|
.offset = IMX7D_SNVS_LPGPR, |
|
.offset_hplr = IMX7D_SNVS_HPLR, |
|
.offset_lplr = IMX7D_SNVS_LPLR, |
|
.size = 16, |
|
}; |
|
|
|
static int snvs_lpgpr_write(void *context, unsigned int offset, void *val, |
|
size_t bytes) |
|
{ |
|
struct snvs_lpgpr_priv *priv = context; |
|
const struct snvs_lpgpr_cfg *dcfg = priv->dcfg; |
|
unsigned int lock_reg; |
|
int ret; |
|
|
|
ret = regmap_read(priv->regmap, dcfg->offset_hplr, &lock_reg); |
|
if (ret < 0) |
|
return ret; |
|
|
|
if (lock_reg & IMX_GPR_SL) |
|
return -EPERM; |
|
|
|
ret = regmap_read(priv->regmap, dcfg->offset_lplr, &lock_reg); |
|
if (ret < 0) |
|
return ret; |
|
|
|
if (lock_reg & IMX_GPR_HL) |
|
return -EPERM; |
|
|
|
return regmap_bulk_write(priv->regmap, dcfg->offset + offset, val, |
|
bytes / 4); |
|
} |
|
|
|
static int snvs_lpgpr_read(void *context, unsigned int offset, void *val, |
|
size_t bytes) |
|
{ |
|
struct snvs_lpgpr_priv *priv = context; |
|
const struct snvs_lpgpr_cfg *dcfg = priv->dcfg; |
|
|
|
return regmap_bulk_read(priv->regmap, dcfg->offset + offset, |
|
val, bytes / 4); |
|
} |
|
|
|
static int snvs_lpgpr_probe(struct platform_device *pdev) |
|
{ |
|
struct device *dev = &pdev->dev; |
|
struct device_node *node = dev->of_node; |
|
struct device_node *syscon_node; |
|
struct snvs_lpgpr_priv *priv; |
|
struct nvmem_config *cfg; |
|
struct nvmem_device *nvmem; |
|
const struct snvs_lpgpr_cfg *dcfg; |
|
|
|
if (!node) |
|
return -ENOENT; |
|
|
|
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); |
|
if (!priv) |
|
return -ENOMEM; |
|
|
|
dcfg = of_device_get_match_data(dev); |
|
if (!dcfg) |
|
return -EINVAL; |
|
|
|
syscon_node = of_get_parent(node); |
|
if (!syscon_node) |
|
return -ENODEV; |
|
|
|
priv->regmap = syscon_node_to_regmap(syscon_node); |
|
of_node_put(syscon_node); |
|
if (IS_ERR(priv->regmap)) |
|
return PTR_ERR(priv->regmap); |
|
|
|
priv->dcfg = dcfg; |
|
|
|
cfg = &priv->cfg; |
|
cfg->priv = priv; |
|
cfg->name = dev_name(dev); |
|
cfg->dev = dev; |
|
cfg->stride = 4; |
|
cfg->word_size = 4; |
|
cfg->size = dcfg->size, |
|
cfg->owner = THIS_MODULE; |
|
cfg->reg_read = snvs_lpgpr_read; |
|
cfg->reg_write = snvs_lpgpr_write; |
|
|
|
nvmem = devm_nvmem_register(dev, cfg); |
|
|
|
return PTR_ERR_OR_ZERO(nvmem); |
|
} |
|
|
|
static const struct of_device_id snvs_lpgpr_dt_ids[] = { |
|
{ .compatible = "fsl,imx6q-snvs-lpgpr", .data = &snvs_lpgpr_cfg_imx6q }, |
|
{ .compatible = "fsl,imx6ul-snvs-lpgpr", |
|
.data = &snvs_lpgpr_cfg_imx6q }, |
|
{ .compatible = "fsl,imx7d-snvs-lpgpr", .data = &snvs_lpgpr_cfg_imx7d }, |
|
{ }, |
|
}; |
|
MODULE_DEVICE_TABLE(of, snvs_lpgpr_dt_ids); |
|
|
|
static struct platform_driver snvs_lpgpr_driver = { |
|
.probe = snvs_lpgpr_probe, |
|
.driver = { |
|
.name = "snvs_lpgpr", |
|
.of_match_table = snvs_lpgpr_dt_ids, |
|
}, |
|
}; |
|
module_platform_driver(snvs_lpgpr_driver); |
|
|
|
MODULE_AUTHOR("Oleksij Rempel <[email protected]>"); |
|
MODULE_DESCRIPTION("Low Power General Purpose Register in i.MX6 and i.MX7 Secure Non-Volatile Storage"); |
|
MODULE_LICENSE("GPL v2");
|
|
|