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u-boot/drivers/misc/npcm_otp.c
Tom Rini d678a59d2d Revert "Merge patch series "arm: dts: am62-beagleplay: Fix Beagleplay Ethernet"" 
When bringing in the series 'arm: dts: am62-beagleplay: Fix Beagleplay
Ethernet"' I failed to notice that b4 noticed it was based on next and
so took that as the base commit and merged that part of next to master.

This reverts commit c8ffd1356d, reversing
changes made to 2ee6f3a5f7.

Reported-by: Jonas Karlman <jonas@kwiboo.se>
Signed-off-by: Tom Rini <trini@konsulko.com>
2024-05-19 08:16:36 -06:00

513 lines
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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2021 Nuvoton Technology Corp.
*/
#include <clk.h>
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <fuse.h>
#include <asm/io.h>
#include <linux/delay.h>
#include <asm/arch/otp.h>
struct npcm_otp_priv {
struct npcm_otp_regs *regs[2];
};
static struct npcm_otp_priv *otp_priv;
/*----------------------------------------------------------------------------*/
/* Function: npcm_otp_check_inputs */
/* */
/* Parameters: arr - fuse array number to check */
/* word - fuse word (offset) to check */
/* Returns: int */
/* Side effects: */
/* Description: Checks is arr and word are illegal and do not exceed */
/* their range. Return 0 if they are legal, -1 if not */
/*----------------------------------------------------------------------------*/
static int npcm_otp_check_inputs(u32 arr, u32 word)
{
if (arr >= NPCM_NUM_OF_SA) {
if (IS_ENABLED(CONFIG_ARCH_NPCM8XX))
printf("\nError: npcm8XX otp includs only one bank: 0\n");
if (IS_ENABLED(CONFIG_ARCH_NPCM7xx))
printf("\nError: npcm7XX otp includs only two banks: 0 and 1\n");
return -1;
}
if (word >= NPCM_OTP_ARR_BYTE_SIZE) {
printf("\nError: npcm otp array comprises only %d bytes, numbered from 0 to %d\n",
NPCM_OTP_ARR_BYTE_SIZE, NPCM_OTP_ARR_BYTE_SIZE - 1);
return -1;
}
return 0;
}
/*----------------------------------------------------------------------------*/
/* Function: npcm_otp_wait_for_otp_ready */
/* */
/* Parameters: array - fuse array to wait for */
/* Returns: int */
/* Side effects: */
/* Description: Initialize the Fuse HW module. */
/*----------------------------------------------------------------------------*/
static int npcm_otp_wait_for_otp_ready(u32 arr, u32 timeout)
{
struct npcm_otp_regs *regs = otp_priv->regs[arr];
u32 time = timeout;
/*------------------------------------------------------------------------*/
/* check parameters validity */
/*------------------------------------------------------------------------*/
if (arr > NPCM_FUSE_SA)
return -EINVAL;
while (--time > 1) {
if (readl(&regs->fst) & FST_RDY) {
/* fuse is ready, clear the status. */
writel(readl(&regs->fst) | FST_RDST, &regs->fst);
return 0;
}
}
/* try to clear the status in case it was set */
writel(readl(&regs->fst) | FST_RDST, &regs->fst);
return -EINVAL;
}
/*----------------------------------------------------------------------------*/
/* Function: npcm_otp_read_byte */
/* */
/* Parameters: arr - Storage Array type [input]. */
/* addr - Byte-address to read from [input]. */
/* data - Pointer to result [output]. */
/* Returns: none */
/* Side effects: */
/* Description: Read 8-bit data from an OTP storage array. */
/*----------------------------------------------------------------------------*/
static void npcm_otp_read_byte(u32 arr, u32 addr, u8 *data)
{
struct npcm_otp_regs *regs = otp_priv->regs[arr];
/* Wait for the Fuse Box Idle */
npcm_otp_wait_for_otp_ready(arr, 0xDEADBEEF);
/* Configure the byte address in the fuse array for read operation */
writel(FADDR_VAL(addr, 0), &regs->faddr);
/* Initiate a read cycle */
writel(READ_INIT, &regs->fctl);
/* Wait for read operation completion */
npcm_otp_wait_for_otp_ready(arr, 0xDEADBEEF);
/* Read the result */
*data = readl(&regs->fdata) & FDATA_MASK;
/* Clean FDATA contents to prevent unauthorized software from reading
* sensitive information
*/
writel(FDATA_CLEAN_VALUE, &regs->fdata);
}
/*----------------------------------------------------------------------------*/
/* Function: npcm_otp_bit_is_programmed */
/* */
/* Parameters: arr - Storage Array type [input]. */
/* byte_offset - Byte offset in array [input]. */
/* bit_offset - Bit offset in byte [input]. */
/* Returns: Nonzero if bit is programmed, zero otherwise. */
/* Side effects: */
/* Description: Check if a bit is programmed in an OTP storage array. */
/*----------------------------------------------------------------------------*/
static bool npcm_otp_bit_is_programmed(u32 arr,
u32 byte_offset, u8 bit_offset)
{
u32 data = 0;
/* Read the entire byte you wish to program */
npcm_otp_read_byte(arr, byte_offset, (u8 *)&data);
/* Check whether the bit is already programmed */
if (data & (1 << bit_offset))
return true;
return false;
}
/*----------------------------------------------------------------------------*/
/* Function: npcm_otp_program_bit */
/* */
/* Parameters: arr - Storage Array type [input]. */
/* byte)offset - Byte offset in array [input]. */
/* bit_offset - Bit offset in byte [input]. */
/* Returns: int */
/* Side effects: */
/* Description: Program (set to 1) a bit in an OTP storage array. */
/*----------------------------------------------------------------------------*/
static int npcm_otp_program_bit(u32 arr, u32 byte_offset,
u8 bit_offset)
{
struct npcm_otp_regs *regs = otp_priv->regs[arr];
int count;
u8 read_data;
/* Wait for the Fuse Box Idle */
npcm_otp_wait_for_otp_ready(arr, 0xDEADBEEF);
/* Make sure the bit is not already programmed */
if (npcm_otp_bit_is_programmed(arr, byte_offset, bit_offset))
return 0;
/* Configure the bit address in the fuse array for program operation */
writel(FADDR_VAL(byte_offset, bit_offset), &regs->faddr);
writel(readl(&regs->faddr) | FADDR_IN_PROG, &regs->faddr);
// program up to MAX_PROGRAM_PULSES
for (count = 1; count <= MAX_PROGRAM_PULSES; count++) {
/* Initiate a program cycle */
writel(PROGRAM_ARM, &regs->fctl);
writel(PROGRAM_INIT, &regs->fctl);
/* Wait for program operation completion */
npcm_otp_wait_for_otp_ready(arr, 0xDEADBEEF);
// after MIN_PROGRAM_PULSES start verifying the result
if (count >= MIN_PROGRAM_PULSES) {
/* Initiate a read cycle */
writel(READ_INIT, &regs->fctl);
/* Wait for read operation completion */
npcm_otp_wait_for_otp_ready(arr, 0xDEADBEEF);
/* Read the result */
read_data = readl(&regs->fdata) & FDATA_MASK;
/* If the bit is set the sequence ended correctly */
if (read_data & (1 << bit_offset))
break;
}
}
// check if programmking failed
if (count > MAX_PROGRAM_PULSES) {
printf("program fail\n");
return -EINVAL;
}
/*
* Clean FDATA contents to prevent unauthorized software from reading
* sensitive information
*/
writel(FDATA_CLEAN_VALUE, &regs->fdata);
return 0;
}
/*----------------------------------------------------------------------------*/
/* Function: npcm_otp_program_byte */
/* */
/* Parameters: arr - Storage Array type [input]. */
/* byte_offset - Byte offset in array [input]. */
/* value - Byte to program [input]. */
/* Returns: int */
/* Side effects: */
/* Description: Program (set to 1) a given byte's relevant bits in an */
/* OTP storage array. */
/*----------------------------------------------------------------------------*/
static int npcm_otp_program_byte(u32 arr, u32 byte_offset,
u8 value)
{
int status = 0;
unsigned int i;
u8 data = 0;
int rc;
rc = npcm_otp_check_inputs(arr, byte_offset);
if (rc != 0)
return rc;
/* Wait for the Fuse Box Idle */
npcm_otp_wait_for_otp_ready(arr, 0xDEADBEEF);
/* Read the entire byte you wish to program */
npcm_otp_read_byte(arr, byte_offset, &data);
/* In case all relevant bits are already programmed - nothing to do */
if ((~data & value) == 0)
return status;
/* Program unprogrammed bits. */
for (i = 0; i < 8; i++) {
if (value & (1 << i)) {
/* Program (set to 1) the relevant bit */
int last_status = npcm_otp_program_bit(arr, byte_offset, (u8)i);
if (last_status != 0)
status = last_status;
}
}
return status;
}
/*----------------------------------------------------------------------------*/
/* Function: npcm_otp_is_fuse_array_disabled */
/* */
/* Parameters: arr - Storage Array type [input]. */
/* Returns: bool */
/* Side effects: */
/* Description: Return true if access to the first 2048 bits of the */
/* specified fuse array is disabled, false if not */
/*----------------------------------------------------------------------------*/
bool npcm_otp_is_fuse_array_disabled(u32 arr)
{
struct npcm_otp_regs *regs = otp_priv->regs[arr];
return (readl(&regs->fcfg) & FCFG_FDIS) != 0;
}
int npcm_otp_select_key(u8 key_index)
{
struct npcm_otp_regs *regs = otp_priv->regs[NPCM_KEY_SA];
u32 idx = 0;
u32 time = 0xDAEDBEEF;
if (key_index >= 4)
return -1;
/* Do not destroy ECCDIS bit */
idx = readl(&regs->fustrap_fkeyind);
/* Configure the key size */
idx &= ~FKEYIND_KSIZE_MASK;
idx |= FKEYIND_KSIZE_256;
/* Configure the key index (0 to 3) */
idx &= ~FKEYIND_KIND_MASK;
idx |= FKEYIND_KIND_KEY(key_index);
writel(idx, &regs->fustrap_fkeyind);
/* Wait for selection completetion */
while (--time > 1) {
if (readl(&regs->fustrap_fkeyind) & FKEYIND_KVAL)
return 0;
udelay(1);
}
return -1;
}
/*----------------------------------------------------------------------------*/
/* Function: npcm_otp_nibble_parity_ecc_encode */
/* */
/* Parameters: datain - pointer to decoded data buffer */
/* dataout - pointer to encoded data buffer (buffer size */
/* should be 2 x dataout) */
/* size - size of encoded data (decoded data x 2) */
/* Returns: none */
/* Side effects: */
/* Description: Decodes the data according to nibble parity ECC scheme. */
/* Size specifies the encoded data size. */
/* Decodes whole bytes only */
/*----------------------------------------------------------------------------*/
void npcm_otp_nibble_parity_ecc_encode(u8 *datain, u8 *dataout, u32 size)
{
u32 i, idx;
u8 E0, E1, E2, E3;
for (i = 0; i < (size / 2); i++) {
E0 = (datain[i] >> 0) & 0x01;
E1 = (datain[i] >> 1) & 0x01;
E2 = (datain[i] >> 2) & 0x01;
E3 = (datain[i] >> 3) & 0x01;
idx = i * 2;
dataout[idx] = datain[i] & 0x0f;
dataout[idx] |= (E0 ^ E1) << 4;
dataout[idx] |= (E2 ^ E3) << 5;
dataout[idx] |= (E0 ^ E2) << 6;
dataout[idx] |= (E1 ^ E3) << 7;
E0 = (datain[i] >> 4) & 0x01;
E1 = (datain[i] >> 5) & 0x01;
E2 = (datain[i] >> 6) & 0x01;
E3 = (datain[i] >> 7) & 0x01;
idx = i * 2 + 1;
dataout[idx] = (datain[i] & 0xf0) >> 4;
dataout[idx] |= (E0 ^ E1) << 4;
dataout[idx] |= (E2 ^ E3) << 5;
dataout[idx] |= (E0 ^ E2) << 6;
dataout[idx] |= (E1 ^ E3) << 7;
}
}
/*----------------------------------------------------------------------------*/
/* Function: npcm_otp_majority_rule_ecc_encode */
/* */
/* Parameters: datain - pointer to decoded data buffer */
/* dataout - pointer to encoded data buffer (buffer size */
/* should be 3 x dataout) */
/* size - size of encoded data (decoded data x 3) */
/* Returns: none */
/* Side effects: */
/* Description: Decodes the data according to Major Rule ECC scheme. */
/* Size specifies the encoded data size. */
/* Decodes whole bytes only */
/*----------------------------------------------------------------------------*/
void npcm_otp_majority_rule_ecc_encode(u8 *datain, u8 *dataout, u32 size)
{
u32 byte;
u32 bit;
u8 bit_val;
u32 decoded_size = size / 3;
for (byte = 0; byte < decoded_size; byte++) {
for (bit = 0; bit < 8; bit++) {
bit_val = (datain[byte] >> bit) & 0x01;
if (bit_val) {
dataout[byte] |= (1 << bit);
dataout[decoded_size + byte] |= (1 << bit);
dataout[decoded_size * 2 + byte] |= (1 << bit);
} else {
dataout[byte] &= ~(1 << bit);
dataout[decoded_size + byte] &= ~(1 << bit);
dataout[decoded_size * 2 + byte] &= ~(1 << bit);
}
}
}
}
/*----------------------------------------------------------------------------*/
/* Function: fuse_program_data */
/* */
/* Parameters: bank - Storage Array type [input]. */
/* word - Byte offset in array [input]. */
/* data - Pointer to data buffer to program. */
/* size - Number of bytes to program. */
/* Returns: none */
/* Side effects: */
/* Description: Programs the given byte array (size bytes) to the given */
/* OTP storage array, starting from offset word. */
/*----------------------------------------------------------------------------*/
int fuse_program_data(u32 bank, u32 word, u8 *data, u32 size)
{
u32 arr = (u32)bank;
u32 byte;
int rc;
rc = npcm_otp_check_inputs(bank, word + size - 1);
if (rc != 0)
return rc;
for (byte = 0; byte < size; byte++) {
u8 val;
val = data[byte];
if (val == 0) // optimization
continue;
rc = npcm_otp_program_byte(arr, word + byte, data[byte]);
if (rc != 0)
return rc;
// verify programming of every '1' bit
val = 0;
npcm_otp_read_byte((u32)bank, byte, &val);
if ((data[byte] & ~val) != 0)
return -1;
}
return 0;
}
int fuse_prog_image(u32 bank, uintptr_t address)
{
return fuse_program_data(bank, 0, (u8 *)address, NPCM_OTP_ARR_BYTE_SIZE);
}
int fuse_read(u32 bank, u32 word, u32 *val)
{
int rc = npcm_otp_check_inputs(bank, word);
if (rc != 0)
return rc;
*val = 0;
npcm_otp_read_byte((u32)bank, word, (u8 *)val);
return 0;
}
int fuse_sense(u32 bank, u32 word, u32 *val)
{
/* We do not support overriding */
return -EINVAL;
}
int fuse_prog(u32 bank, u32 word, u32 val)
{
int rc;
rc = npcm_otp_check_inputs(bank, word);
if (rc != 0)
return rc;
return npcm_otp_program_byte(bank, word, (u8)val);
}
int fuse_override(u32 bank, u32 word, u32 val)
{
/* We do not support overriding */
return -EINVAL;
}
static int npcm_otp_bind(struct udevice *dev)
{
struct npcm_otp_regs *regs;
otp_priv = calloc(1, sizeof(struct npcm_otp_priv));
if (!otp_priv)
return -ENOMEM;
regs = dev_remap_addr_index(dev, 0);
if (!regs) {
printf("Cannot find reg address (arr #0), binding failed\n");
return -EINVAL;
}
otp_priv->regs[0] = regs;
if (IS_ENABLED(CONFIG_ARCH_NPCM7xx)) {
regs = dev_remap_addr_index(dev, 1);
if (!regs) {
printf("Cannot find reg address (arr #1), binding failed\n");
return -EINVAL;
}
otp_priv->regs[1] = regs;
}
printf("OTP: NPCM OTP module bind OK\n");
return 0;
}
static const struct udevice_id npcm_otp_ids[] = {
{ .compatible = "nuvoton,npcm845-otp" },
{ .compatible = "nuvoton,npcm750-otp" },
{ }
};
U_BOOT_DRIVER(npcm_otp) = {
.name = "npcm_otp",
.id = UCLASS_MISC,
.of_match = npcm_otp_ids,
.priv_auto = sizeof(struct npcm_otp_priv),
.bind = npcm_otp_bind,
};
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