mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-14 07:13:03 +00:00
4992d8360d
Unlike in Linux, -supply is not automatically appended to regulator
requests. Add it.
Fixes: 2645bc0e12
("arm: layerscape: Add sfp driver")
Signed-off-by: Sean Anderson <sean.anderson@seco.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
350 lines
7.9 KiB
C
350 lines
7.9 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Copyright (C) 2022 Sean Anderson <sean.anderson@seco.com>
|
|
*
|
|
* This driver supports the Security Fuse Processor device found on some
|
|
* Layerscape processors. At the moment, we only support a few processors.
|
|
* This driver was written with reference to the Layerscape SDK User
|
|
* Guide [1] and the ATF SFP driver [2].
|
|
*
|
|
* [1] https://docs.nxp.com/bundle/GUID-487B2E69-BB19-42CB-AC38-7EF18C0FE3AE/page/GUID-27FC40AD-3321-4A82-B29E-7BB49EE94F23.html
|
|
* [2] https://source.codeaurora.org/external/qoriq/qoriq-components/atf/tree/drivers/nxp/sfp?h=github.com/master
|
|
*/
|
|
|
|
#define LOG_CATEGORY UCLASS_MISC
|
|
#include <common.h>
|
|
#include <clk.h>
|
|
#include <fuse.h>
|
|
#include <misc.h>
|
|
#include <asm/io.h>
|
|
#include <dm/device_compat.h>
|
|
#include <dm/read.h>
|
|
#include <linux/bitfield.h>
|
|
#include <power/regulator.h>
|
|
|
|
DECLARE_GLOBAL_DATA_PTR;
|
|
|
|
#define SFP_INGR 0x20
|
|
#define SFP_SVHESR 0x24
|
|
#define SFP_SFPCR 0x28
|
|
|
|
#define SFP_START 0x200
|
|
#define SFP_END 0x284
|
|
#define SFP_SIZE (SFP_END - SFP_START + 4)
|
|
|
|
#define SFP_INGR_ERR BIT(8)
|
|
#define SFP_INGR_INST GENMASK(7, 0)
|
|
|
|
#define SFP_INGR_READFB 0x01
|
|
#define SFP_INGR_PROGFB 0x02
|
|
|
|
#define SFP_SFPCR_PPW GENMASK(15, 0)
|
|
|
|
enum ls2_sfp_ioctl {
|
|
LS2_SFP_IOCTL_READ,
|
|
LS2_SFP_IOCTL_PROG,
|
|
};
|
|
|
|
/**
|
|
* struct ls2_sfp_priv - private data for LS2 SFP
|
|
* @base: Base address of SFP
|
|
* @supply: The (optional) supply for TA_PROG_SFP
|
|
* @programmed: Whether we've already programmed the fuses since the last
|
|
* reset. The SFP has a *very* limited amount of programming
|
|
* cycles (two to six, depending on the model), so we try and
|
|
* prevent accidentally performing additional programming
|
|
* cycles.
|
|
* @dirty: Whether the mirror registers have been written to (overridden)
|
|
* since we've last read the fuses (either as part of the reset
|
|
* process or using a READFB instruction). There is a much larger,
|
|
* but still finite, limit on the number of SFP read cycles (around
|
|
* 300,000), so we try and minimize reads as well.
|
|
*/
|
|
struct ls2_sfp_priv {
|
|
void __iomem *base;
|
|
struct udevice *supply;
|
|
bool programmed, dirty;
|
|
};
|
|
|
|
static u32 ls2_sfp_readl(struct ls2_sfp_priv *priv, ulong off)
|
|
{
|
|
u32 val = be32_to_cpu(readl(priv->base + off));
|
|
|
|
log_debug("%08x = readl(%p)\n", val, priv->base + off);
|
|
return val;
|
|
}
|
|
|
|
static void ls2_sfp_writel(struct ls2_sfp_priv *priv, ulong val, ulong off)
|
|
{
|
|
log_debug("writel(%08lx, %p)\n", val, priv->base + off);
|
|
writel(cpu_to_be32(val), priv->base + off);
|
|
}
|
|
|
|
static bool ls2_sfp_validate(struct udevice *dev, int offset, int size)
|
|
{
|
|
if (offset < 0 || size < 0) {
|
|
dev_notice(dev, "size and offset must be positive\n");
|
|
return false;
|
|
}
|
|
|
|
if (offset & 3 || size & 3) {
|
|
dev_notice(dev, "size and offset must be multiples of 4\n");
|
|
return false;
|
|
}
|
|
|
|
if (offset + size > SFP_SIZE) {
|
|
dev_notice(dev, "size + offset must be <= %#x\n", SFP_SIZE);
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static int ls2_sfp_read(struct udevice *dev, int offset, void *buf_bytes,
|
|
int size)
|
|
{
|
|
int i;
|
|
struct ls2_sfp_priv *priv = dev_get_priv(dev);
|
|
u32 *buf = buf_bytes;
|
|
|
|
if (!ls2_sfp_validate(dev, offset, size))
|
|
return -EINVAL;
|
|
|
|
for (i = 0; i < size; i += 4)
|
|
buf[i >> 2] = ls2_sfp_readl(priv, SFP_START + offset + i);
|
|
|
|
return size;
|
|
}
|
|
|
|
static int ls2_sfp_write(struct udevice *dev, int offset,
|
|
const void *buf_bytes, int size)
|
|
{
|
|
int i;
|
|
struct ls2_sfp_priv *priv = dev_get_priv(dev);
|
|
const u32 *buf = buf_bytes;
|
|
|
|
if (!ls2_sfp_validate(dev, offset, size))
|
|
return -EINVAL;
|
|
|
|
for (i = 0; i < size; i += 4)
|
|
ls2_sfp_writel(priv, buf[i >> 2], SFP_START + offset + i);
|
|
|
|
priv->dirty = true;
|
|
return size;
|
|
}
|
|
|
|
static int ls2_sfp_check_secret(struct udevice *dev)
|
|
{
|
|
struct ls2_sfp_priv *priv = dev_get_priv(dev);
|
|
u32 svhesr = ls2_sfp_readl(priv, SFP_SVHESR);
|
|
|
|
if (svhesr) {
|
|
dev_warn(dev, "secret value hamming error not zero: %08x\n",
|
|
svhesr);
|
|
return -EIO;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int ls2_sfp_transaction(struct ls2_sfp_priv *priv, ulong inst)
|
|
{
|
|
u32 ingr;
|
|
|
|
ls2_sfp_writel(priv, inst, SFP_INGR);
|
|
|
|
do {
|
|
ingr = ls2_sfp_readl(priv, SFP_INGR);
|
|
} while (FIELD_GET(SFP_INGR_INST, ingr));
|
|
|
|
return FIELD_GET(SFP_INGR_ERR, ingr) ? -EIO : 0;
|
|
}
|
|
|
|
static int ls2_sfp_ioctl(struct udevice *dev, unsigned long request, void *buf)
|
|
{
|
|
int ret;
|
|
struct ls2_sfp_priv *priv = dev_get_priv(dev);
|
|
|
|
switch (request) {
|
|
case LS2_SFP_IOCTL_READ:
|
|
if (!priv->dirty) {
|
|
dev_dbg(dev, "ignoring read request, since fuses are not dirty\n");
|
|
return 0;
|
|
}
|
|
|
|
ret = ls2_sfp_transaction(priv, SFP_INGR_READFB);
|
|
if (ret) {
|
|
dev_err(dev, "error reading fuses\n");
|
|
return ret;
|
|
}
|
|
|
|
ls2_sfp_check_secret(dev);
|
|
priv->dirty = false;
|
|
return 0;
|
|
case LS2_SFP_IOCTL_PROG:
|
|
if (priv->programmed) {
|
|
dev_warn(dev, "fuses already programmed\n");
|
|
return -EPERM;
|
|
}
|
|
|
|
ret = ls2_sfp_check_secret(dev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (priv->supply) {
|
|
ret = regulator_set_enable(priv->supply, true);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
ret = ls2_sfp_transaction(priv, SFP_INGR_PROGFB);
|
|
priv->programmed = true;
|
|
if (priv->supply)
|
|
regulator_set_enable(priv->supply, false);
|
|
|
|
if (ret)
|
|
dev_err(dev, "error programming fuses\n");
|
|
return ret;
|
|
default:
|
|
dev_dbg(dev, "unknown ioctl %lu\n", request);
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
static const struct misc_ops ls2_sfp_ops = {
|
|
.read = ls2_sfp_read,
|
|
.write = ls2_sfp_write,
|
|
.ioctl = ls2_sfp_ioctl,
|
|
};
|
|
|
|
static int ls2_sfp_probe(struct udevice *dev)
|
|
{
|
|
int ret;
|
|
struct clk clk;
|
|
struct ls2_sfp_priv *priv = dev_get_priv(dev);
|
|
ulong rate;
|
|
|
|
priv->base = dev_read_addr_ptr(dev);
|
|
if (!priv->base) {
|
|
dev_dbg(dev, "could not read register base\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
ret = device_get_supply_regulator(dev, "ta-sfp-prog-supply", &priv->supply);
|
|
if (ret && ret != -ENODEV && ret != -ENOSYS) {
|
|
dev_dbg(dev, "problem getting supply (err %d)\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
ret = clk_get_by_name(dev, "sfp", &clk);
|
|
if (ret == -ENOSYS) {
|
|
rate = gd->bus_clk / 4;
|
|
} else if (ret) {
|
|
dev_dbg(dev, "could not get clock (err %d)\n", ret);
|
|
return ret;
|
|
} else {
|
|
ret = clk_enable(&clk);
|
|
if (ret) {
|
|
dev_dbg(dev, "could not enable clock (err %d)\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
rate = clk_get_rate(&clk);
|
|
clk_free(&clk);
|
|
if (!rate || IS_ERR_VALUE(rate)) {
|
|
ret = rate ? rate : -ENOENT;
|
|
dev_dbg(dev, "could not get clock rate (err %d)\n",
|
|
ret);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
/* sfp clock in MHz * 12 */
|
|
ls2_sfp_writel(priv, FIELD_PREP(SFP_SFPCR_PPW, rate * 12 / 1000000),
|
|
SFP_SFPCR);
|
|
|
|
ls2_sfp_check_secret(dev);
|
|
return 0;
|
|
}
|
|
|
|
static const struct udevice_id ls2_sfp_ids[] = {
|
|
{ .compatible = "fsl,ls1021a-sfp" },
|
|
{ }
|
|
};
|
|
|
|
U_BOOT_DRIVER(ls2_sfp) = {
|
|
.name = "ls2_sfp",
|
|
.id = UCLASS_MISC,
|
|
.of_match = ls2_sfp_ids,
|
|
.probe = ls2_sfp_probe,
|
|
.ops = &ls2_sfp_ops,
|
|
.priv_auto = sizeof(struct ls2_sfp_priv),
|
|
};
|
|
|
|
static int ls2_sfp_device(struct udevice **dev)
|
|
{
|
|
int ret = uclass_get_device_by_driver(UCLASS_MISC,
|
|
DM_DRIVER_GET(ls2_sfp), dev);
|
|
|
|
if (ret)
|
|
log_debug("device not found (err %d)\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
int fuse_read(u32 bank, u32 word, u32 *val)
|
|
{
|
|
int ret;
|
|
struct udevice *dev;
|
|
|
|
ret = ls2_sfp_device(&dev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = misc_ioctl(dev, LS2_SFP_IOCTL_READ, NULL);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = misc_read(dev, word << 2, val, sizeof(*val));
|
|
return ret < 0 ? ret : 0;
|
|
}
|
|
|
|
int fuse_sense(u32 bank, u32 word, u32 *val)
|
|
{
|
|
int ret;
|
|
struct udevice *dev;
|
|
|
|
ret = ls2_sfp_device(&dev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = misc_read(dev, word << 2, val, sizeof(*val));
|
|
return ret < 0 ? ret : 0;
|
|
}
|
|
|
|
int fuse_prog(u32 bank, u32 word, u32 val)
|
|
{
|
|
int ret;
|
|
struct udevice *dev;
|
|
|
|
ret = ls2_sfp_device(&dev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = misc_write(dev, word << 2, &val, sizeof(val));
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return misc_ioctl(dev, LS2_SFP_IOCTL_PROG, NULL);
|
|
}
|
|
|
|
int fuse_override(u32 bank, u32 word, u32 val)
|
|
{
|
|
int ret;
|
|
struct udevice *dev;
|
|
|
|
ret = ls2_sfp_device(&dev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = misc_write(dev, word << 2, &val, sizeof(val));
|
|
return ret < 0 ? ret : 0;
|
|
}
|