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u-boot/drivers/misc/npcm_otp.c
Tom Rini 03de305ec4 Restore patch series "arm: dts: am62-beagleplay: Fix Beagleplay Ethernet" 
As part of bringing the master branch back in to next, we need to allow
for all of these changes to exist here.

Reported-by: Jonas Karlman <jonas@kwiboo.se>
Signed-off-by: Tom Rini <trini@konsulko.com>
2024-05-20 13:35:03 -06:00

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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2021 Nuvoton Technology Corp.
*/
#include <clk.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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