From 8d2a02b24d66aa359e83eebc1ed3c0f85367a1cb Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Thu, 16 May 2024 03:11:33 +0000
Subject: [PATCH] AX88772C_eeprom and ax8872c build together
---
kernel/drivers/nvmem/sunxi_sid.c | 132 +++++++++++++++----------------------------
1 files changed, 47 insertions(+), 85 deletions(-)
diff --git a/kernel/drivers/nvmem/sunxi_sid.c b/kernel/drivers/nvmem/sunxi_sid.c
index 69f8e97..e26ef1b 100644
--- a/kernel/drivers/nvmem/sunxi_sid.c
+++ b/kernel/drivers/nvmem/sunxi_sid.c
@@ -1,18 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0+
/*
* Allwinner sunXi SoCs Security ID support.
*
* Copyright (c) 2013 Oliver Schinagl <oliver@schinagl.nl>
* Copyright (C) 2014 Maxime Ripard <maxime.ripard@free-electrons.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
*/
#include <linux/device.h>
@@ -35,13 +26,6 @@
#define SUN8I_SID_OP_LOCK (0xAC << 8)
#define SUN8I_SID_READ BIT(1)
-static struct nvmem_config econfig = {
- .name = "sunxi-sid",
- .read_only = true,
- .stride = 4,
- .word_size = 1,
-};
-
struct sunxi_sid_cfg {
u32 value_offset;
u32 size;
@@ -53,33 +37,12 @@
u32 value_offset;
};
-/* We read the entire key, due to a 32 bit read alignment requirement. Since we
- * want to return the requested byte, this results in somewhat slower code and
- * uses 4 times more reads as needed but keeps code simpler. Since the SID is
- * only very rarely probed, this is not really an issue.
- */
-static u8 sunxi_sid_read_byte(const struct sunxi_sid *sid,
- const unsigned int offset)
-{
- u32 sid_key;
-
- sid_key = ioread32be(sid->base + round_down(offset, 4));
- sid_key >>= (offset % 4) * 8;
-
- return sid_key; /* Only return the last byte */
-}
-
static int sunxi_sid_read(void *context, unsigned int offset,
void *val, size_t bytes)
{
struct sunxi_sid *sid = context;
- u8 *buf = val;
- /* Offset the read operation to the real position of SID */
- offset += sid->value_offset;
-
- while (bytes--)
- *buf++ = sunxi_sid_read_byte(sid, offset++);
+ memcpy_fromio(val, sid->base + sid->value_offset + offset, bytes);
return 0;
}
@@ -115,35 +78,33 @@
* to be not reliable at all.
* Read by the registers instead.
*/
-static int sun8i_sid_read_byte_by_reg(const struct sunxi_sid *sid,
- const unsigned int offset,
- u8 *out)
-{
- u32 word;
- int ret;
-
- ret = sun8i_sid_register_readout(sid, offset & ~0x03, &word);
-
- if (ret)
- return ret;
-
- *out = (word >> ((offset & 0x3) * 8)) & 0xff;
-
- return 0;
-}
-
static int sun8i_sid_read_by_reg(void *context, unsigned int offset,
void *val, size_t bytes)
{
struct sunxi_sid *sid = context;
- u8 *buf = val;
+ u32 word;
int ret;
- while (bytes--) {
- ret = sun8i_sid_read_byte_by_reg(sid, offset++, buf++);
+ /* .stride = 4 so offset is guaranteed to be aligned */
+ while (bytes >= 4) {
+ ret = sun8i_sid_register_readout(sid, offset, val);
if (ret)
return ret;
+
+ val += 4;
+ offset += 4;
+ bytes -= 4;
}
+
+ if (!bytes)
+ return 0;
+
+ /* Handle any trailing bytes */
+ ret = sun8i_sid_register_readout(sid, offset, &word);
+ if (ret)
+ return ret;
+
+ memcpy(val, &word, bytes);
return 0;
}
@@ -152,9 +113,10 @@
{
struct device *dev = &pdev->dev;
struct resource *res;
+ struct nvmem_config *nvmem_cfg;
struct nvmem_device *nvmem;
struct sunxi_sid *sid;
- int ret, i, size;
+ int size;
char *randomness;
const struct sunxi_sid_cfg *cfg;
@@ -174,43 +136,37 @@
size = cfg->size;
- econfig.size = size;
- econfig.dev = dev;
+ nvmem_cfg = devm_kzalloc(dev, sizeof(*nvmem_cfg), GFP_KERNEL);
+ if (!nvmem_cfg)
+ return -ENOMEM;
+
+ nvmem_cfg->dev = dev;
+ nvmem_cfg->name = "sunxi-sid";
+ nvmem_cfg->read_only = true;
+ nvmem_cfg->size = cfg->size;
+ nvmem_cfg->word_size = 1;
+ nvmem_cfg->stride = 4;
+ nvmem_cfg->priv = sid;
if (cfg->need_register_readout)
- econfig.reg_read = sun8i_sid_read_by_reg;
+ nvmem_cfg->reg_read = sun8i_sid_read_by_reg;
else
- econfig.reg_read = sunxi_sid_read;
- econfig.priv = sid;
- nvmem = nvmem_register(&econfig);
+ nvmem_cfg->reg_read = sunxi_sid_read;
+
+ nvmem = devm_nvmem_register(dev, nvmem_cfg);
if (IS_ERR(nvmem))
return PTR_ERR(nvmem);
randomness = kzalloc(size, GFP_KERNEL);
- if (!randomness) {
- ret = -EINVAL;
- goto err_unreg_nvmem;
- }
+ if (!randomness)
+ return -ENOMEM;
- for (i = 0; i < size; i++)
- econfig.reg_read(sid, i, &randomness[i], 1);
-
+ nvmem_cfg->reg_read(sid, 0, randomness, size);
add_device_randomness(randomness, size);
kfree(randomness);
platform_set_drvdata(pdev, nvmem);
return 0;
-
-err_unreg_nvmem:
- nvmem_unregister(nvmem);
- return ret;
-}
-
-static int sunxi_sid_remove(struct platform_device *pdev)
-{
- struct nvmem_device *nvmem = platform_get_drvdata(pdev);
-
- return nvmem_unregister(nvmem);
}
static const struct sunxi_sid_cfg sun4i_a10_cfg = {
@@ -230,6 +186,12 @@
static const struct sunxi_sid_cfg sun50i_a64_cfg = {
.value_offset = 0x200,
.size = 0x100,
+ .need_register_readout = true,
+};
+
+static const struct sunxi_sid_cfg sun50i_h6_cfg = {
+ .value_offset = 0x200,
+ .size = 0x200,
};
static const struct of_device_id sunxi_sid_of_match[] = {
@@ -239,13 +201,13 @@
{ .compatible = "allwinner,sun8i-h3-sid", .data = &sun8i_h3_cfg },
{ .compatible = "allwinner,sun50i-a64-sid", .data = &sun50i_a64_cfg },
{ .compatible = "allwinner,sun50i-h5-sid", .data = &sun50i_a64_cfg },
+ { .compatible = "allwinner,sun50i-h6-sid", .data = &sun50i_h6_cfg },
{/* sentinel */},
};
MODULE_DEVICE_TABLE(of, sunxi_sid_of_match);
static struct platform_driver sunxi_sid_driver = {
.probe = sunxi_sid_probe,
- .remove = sunxi_sid_remove,
.driver = {
.name = "eeprom-sunxi-sid",
.of_match_table = sunxi_sid_of_match,
--
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