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https://github.com/AsahiLinux/u-boot
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05ec899140
For printing phys_addr_t we should use %pa to avoid warning like:
drivers/bootcount/bootcount_syscon.c:110:17: note: in expansion of macro ‘dev_err’
110 | dev_err(dev, "%s: Unsupported register size: %d\n", __func__,
| ^~~~~~~
seen for sandbox_defconfig with CONFIG_PHYS_64BIT=y.
Cf. commit 1eebd14b79
("vsprintf: Add modifier for phys_addr_t")
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
159 lines
4.5 KiB
C
159 lines
4.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) Vaisala Oyj. All rights reserved.
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*/
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#include <common.h>
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#include <bootcount.h>
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#include <dm.h>
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#include <dm/device_compat.h>
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#include <linux/ioport.h>
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#include <regmap.h>
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#include <syscon.h>
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#define BYTES_TO_BITS(bytes) ((bytes) << 3)
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#define GEN_REG_MASK(val_size, val_addr) \
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(GENMASK(BYTES_TO_BITS(val_size) - 1, 0) \
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<< (!!((val_addr) == 0x02) * BYTES_TO_BITS(2)))
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#define GET_DEFAULT_VALUE(val_size) \
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(CONFIG_SYS_BOOTCOUNT_MAGIC >> \
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(BYTES_TO_BITS((sizeof(u32) - (val_size)))))
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/**
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* struct bootcount_syscon_priv - driver's private data
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*
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* @regmap: syscon regmap
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* @reg_addr: register address used to store the bootcount value
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* @size: size of the bootcount value (2 or 4 bytes)
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* @magic: magic used to validate/save the bootcount value
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* @magic_mask: magic value bitmask
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* @reg_mask: mask used to identify the location of the bootcount value
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* in the register when 2 bytes length is used
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* @shift: value used to extract the botcount value from the register
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*/
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struct bootcount_syscon_priv {
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struct regmap *regmap;
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fdt_addr_t reg_addr;
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fdt_size_t size;
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u32 magic;
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u32 magic_mask;
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u32 reg_mask;
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int shift;
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};
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static int bootcount_syscon_set(struct udevice *dev, const u32 val)
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{
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struct bootcount_syscon_priv *priv = dev_get_priv(dev);
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u32 regval;
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if ((val & priv->magic_mask) != 0)
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return -EINVAL;
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regval = (priv->magic & priv->magic_mask) | (val & ~priv->magic_mask);
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if (priv->size == 2) {
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regval &= 0xffff;
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regval |= (regval & 0xffff) << BYTES_TO_BITS(priv->size);
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}
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debug("%s: Prepare to write reg value: 0x%08x with register mask: 0x%08x\n",
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__func__, regval, priv->reg_mask);
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return regmap_update_bits(priv->regmap, priv->reg_addr, priv->reg_mask,
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regval);
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}
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static int bootcount_syscon_get(struct udevice *dev, u32 *val)
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{
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struct bootcount_syscon_priv *priv = dev_get_priv(dev);
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u32 regval;
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int ret;
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ret = regmap_read(priv->regmap, priv->reg_addr, ®val);
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if (ret)
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return ret;
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regval &= priv->reg_mask;
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regval >>= priv->shift;
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if ((regval & priv->magic_mask) == (priv->magic & priv->magic_mask)) {
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*val = regval & ~priv->magic_mask;
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} else {
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dev_err(dev, "%s: Invalid bootcount magic\n", __func__);
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return -EINVAL;
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}
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debug("%s: Read bootcount value: 0x%08x from regval: 0x%08x\n",
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__func__, *val, regval);
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return 0;
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}
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static int bootcount_syscon_of_to_plat(struct udevice *dev)
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{
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struct bootcount_syscon_priv *priv = dev_get_priv(dev);
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fdt_addr_t bootcount_offset;
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fdt_size_t reg_size;
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priv->regmap = syscon_regmap_lookup_by_phandle(dev, "syscon");
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if (IS_ERR(priv->regmap)) {
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dev_err(dev, "%s: Unable to find regmap (%ld)\n", __func__,
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PTR_ERR(priv->regmap));
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return PTR_ERR(priv->regmap);
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}
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priv->reg_addr = dev_read_addr_size_name(dev, "syscon_reg", ®_size);
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if (priv->reg_addr == FDT_ADDR_T_NONE) {
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dev_err(dev, "%s: syscon_reg address not found\n", __func__);
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return -EINVAL;
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}
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if (reg_size != 4) {
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dev_err(dev, "%s: Unsupported register size: %pa\n", __func__,
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®_size);
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return -EINVAL;
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}
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bootcount_offset = dev_read_addr_size_name(dev, "offset", &priv->size);
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if (bootcount_offset == FDT_ADDR_T_NONE) {
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dev_err(dev, "%s: offset configuration not found\n", __func__);
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return -EINVAL;
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}
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if (bootcount_offset + priv->size > reg_size) {
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dev_err(dev,
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"%s: Bootcount value doesn't fit in the reserved space\n",
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__func__);
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return -EINVAL;
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}
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if (priv->size != 2 && priv->size != 4) {
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dev_err(dev,
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"%s: Driver supports only 2 and 4 bytes bootcount size\n",
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__func__);
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return -EINVAL;
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}
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priv->magic = GET_DEFAULT_VALUE(priv->size);
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priv->magic_mask = GENMASK(BYTES_TO_BITS(priv->size) - 1,
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BYTES_TO_BITS(priv->size >> 1));
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priv->shift = !!(bootcount_offset == 0x02) * BYTES_TO_BITS(priv->size);
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priv->reg_mask = GEN_REG_MASK(priv->size, bootcount_offset);
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return 0;
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}
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static const struct bootcount_ops bootcount_syscon_ops = {
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.get = bootcount_syscon_get,
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.set = bootcount_syscon_set,
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};
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static const struct udevice_id bootcount_syscon_ids[] = {
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{ .compatible = "u-boot,bootcount-syscon" },
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{}
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};
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U_BOOT_DRIVER(bootcount_syscon) = {
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.name = "bootcount-syscon",
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.id = UCLASS_BOOTCOUNT,
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.of_to_plat = bootcount_syscon_of_to_plat,
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.priv_auto = sizeof(struct bootcount_syscon_priv),
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.of_match = bootcount_syscon_ids,
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.ops = &bootcount_syscon_ops,
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};
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