1 // SPDX-License-Identifier: GPL-2.0+
3  * Copyright (C) 2018, STMicroelectronics - All Rights Reserved
25 #define BSEC_SWLOCK_OFF			0x07C /* write in OTP sticky lock */
47  * OTP Lock services definition
53  * bsec_check_error() - Check status of one otp
55  * @otp: otp number (0 - BSEC_OTP_MAX_VALUE)
56  * Return: 0 if no error, -EAGAIN or -ENOTSUPP
58 static u32 bsec_check_error(u32 base, u32 otp)  in bsec_check_error()  argument
63 	bit = 1 << (otp & OTP_LOCK_MASK);  in bsec_check_error()
64 	bank = ((otp >> OTP_LOCK_BANK_SHIFT) & OTP_LOCK_MASK) * sizeof(u32);  in bsec_check_error()
67 		return -EAGAIN;  in bsec_check_error()
69 		return -ENOTSUPP;  in bsec_check_error()
75  * bsec_lock() - manage lock for each type SR/SP/SW
77  * @otp: otp number (0 - BSEC_OTP_MAX_VALUE)
80 static bool bsec_read_lock(u32 address, u32 otp)  in bsec_read_lock()  argument
85 	bit = 1 << (otp & OTP_LOCK_MASK);  in bsec_read_lock()
86 	bank = ((otp >> OTP_LOCK_BANK_SHIFT) & OTP_LOCK_MASK) * sizeof(u32);  in bsec_read_lock()
92  * bsec_read_SR_lock() - read SR lock (Shadowing)
94  * @otp: otp number (0 - BSEC_OTP_MAX_VALUE)
97 static bool bsec_read_SR_lock(u32 base, u32 otp)  in bsec_read_SR_lock()  argument
99 	return bsec_read_lock(base + BSEC_SRLOCK_OFF, otp);  in bsec_read_SR_lock()
103  * bsec_read_SP_lock() - read SP lock (program Lock)
105  * @otp: otp number (0 - BSEC_OTP_MAX_VALUE)
108 static bool bsec_read_SP_lock(u32 base, u32 otp)  in bsec_read_SP_lock()  argument
110 	return bsec_read_lock(base + BSEC_SPLOCK_OFF, otp);  in bsec_read_SP_lock()
114  * bsec_SW_lock() - manage SW lock (Write in Shadow)
116  * @otp: otp number (0 - BSEC_OTP_MAX_VALUE)
119 static bool bsec_read_SW_lock(u32 base, u32 otp)  in bsec_read_SW_lock()  argument
121 	return bsec_read_lock(base + BSEC_SWLOCK_OFF, otp);  in bsec_read_SW_lock()
125  * bsec_power_safmem() - Activate or deactivate safmem power
150  * bsec_shadow_register() - copy safmen otp to bsec data
152  * @otp: otp number (0 - BSEC_OTP_MAX_VALUE)
155 static int bsec_shadow_register(u32 base, u32 otp)  in bsec_shadow_register()  argument
161 	/* check if shadowing of otp is locked */  in bsec_shadow_register()
162 	if (bsec_read_SR_lock(base, otp))  in bsec_shadow_register()
163 		pr_debug("bsec : OTP %d is locked and refreshed with 0\n", otp);  in bsec_shadow_register()
171 		power_up = 1;  in bsec_shadow_register()
173 	/* set BSEC_OTP_CTRL_OFF with the otp value*/  in bsec_shadow_register()
174 	writel(otp | BSEC_READ, base + BSEC_OTP_CTRL_OFF);  in bsec_shadow_register()
176 	/* check otp status*/  in bsec_shadow_register()
183 	ret = bsec_check_error(base, otp);  in bsec_shadow_register()
192  * bsec_read_shadow() - read an otp data value from shadow
195  * @otp: otp number (0 - BSEC_OTP_MAX_VALUE)
198 static int bsec_read_shadow(u32 base, u32 *val, u32 otp)  in bsec_read_shadow()  argument
200 	*val = readl(base + BSEC_OTP_DATA_OFF + otp * sizeof(u32));  in bsec_read_shadow()
202 	return bsec_check_error(base, otp);  in bsec_read_shadow()
206  * bsec_write_shadow() - write value in BSEC data register in shadow
209  * @otp: otp number (0 - BSEC_OTP_MAX_VALUE)
212 static int bsec_write_shadow(u32 base, u32 val, u32 otp)  in bsec_write_shadow()  argument
214 	/* check if programming of otp is locked */  in bsec_write_shadow()
215 	if (bsec_read_SW_lock(base, otp))  in bsec_write_shadow()
216 		pr_debug("bsec : OTP %d is lock, write will be ignore\n", otp);  in bsec_write_shadow()
218 	writel(val, base + BSEC_OTP_DATA_OFF + otp * sizeof(u32));  in bsec_write_shadow()
220 	return bsec_check_error(base, otp);  in bsec_write_shadow()
224  * bsec_program_otp() - program a bit in SAFMEM
227  * @otp: otp number (0 - BSEC_OTP_MAX_VALUE)
228  * after the function the otp data is not refreshed in shadow
231 static int bsec_program_otp(long base, u32 val, u32 otp)  in bsec_program_otp()  argument
236 	if (bsec_read_SP_lock(base, otp))  in bsec_program_otp()
237 		pr_debug("bsec : OTP %d locked, prog will be ignore\n", otp);  in bsec_program_otp()
239 	if (readl(base + BSEC_OTP_LOCK_OFF) & (1 << BSEC_LOCK_PROGRAM))  in bsec_program_otp()
253 	/* set BSEC_OTP_CTRL_OFF with the otp value */  in bsec_program_otp()
254 	writel(otp | BSEC_WRITE, base + BSEC_OTP_CTRL_OFF);  in bsec_program_otp()
256 	/* check otp status*/  in bsec_program_otp()
264 		ret = -EACCES;  in bsec_program_otp()
266 		ret = bsec_check_error(base, otp);  in bsec_program_otp()
279 static int stm32mp_bsec_read_otp(struct udevice *dev, u32 *val, u32 otp)  in stm32mp_bsec_read_otp()  argument
286 	ret = bsec_read_shadow(plat->base, &tmp_data, otp);  in stm32mp_bsec_read_otp()
290 	/* copy otp in shadow */  in stm32mp_bsec_read_otp()
291 	ret = bsec_shadow_register(plat->base, otp);  in stm32mp_bsec_read_otp()
295 	ret = bsec_read_shadow(plat->base, val, otp);  in stm32mp_bsec_read_otp()
300 	ret = bsec_write_shadow(plat->base, tmp_data, otp);  in stm32mp_bsec_read_otp()
304 static int stm32mp_bsec_read_shadow(struct udevice *dev, u32 *val, u32 otp)  in stm32mp_bsec_read_shadow()  argument
308 	return bsec_read_shadow(plat->base, val, otp);  in stm32mp_bsec_read_shadow()
311 static int stm32mp_bsec_write_otp(struct udevice *dev, u32 val, u32 otp)  in stm32mp_bsec_write_otp()  argument
315 	return bsec_program_otp(plat->base, val, otp);  in stm32mp_bsec_write_otp()
318 static int stm32mp_bsec_write_shadow(struct udevice *dev, u32 val, u32 otp)  in stm32mp_bsec_write_shadow()  argument
322 	return bsec_write_shadow(plat->base, val, otp);  in stm32mp_bsec_write_shadow()
332 	int otp;  in stm32mp_bsec_read()  local
335 		offset -= STM32_BSEC_OTP_OFFSET;  in stm32mp_bsec_read()
338 	otp = offset / sizeof(u32);  in stm32mp_bsec_read()
340 	if (otp < 0 || (otp + nb_otp - 1) > BSEC_OTP_MAX_VALUE) {  in stm32mp_bsec_read()
341 		dev_err(dev, "wrong value for otp, max value : %i\n",  in stm32mp_bsec_read()
343 		return -EINVAL;  in stm32mp_bsec_read()
346 	for (i = otp; i < (otp + nb_otp); i++) {  in stm32mp_bsec_read()
347 		u32 *addr = &((u32 *)buf)[i - otp];  in stm32mp_bsec_read()
367 	int otp;  in stm32mp_bsec_write()  local
370 		offset -= STM32_BSEC_OTP_OFFSET;  in stm32mp_bsec_write()
373 	otp = offset / sizeof(u32);  in stm32mp_bsec_write()
375 	if (otp < 0 || (otp + nb_otp - 1) > BSEC_OTP_MAX_VALUE) {  in stm32mp_bsec_write()
376 		dev_err(dev, "wrong value for otp, max value : %d\n",  in stm32mp_bsec_write()
378 		return -EINVAL;  in stm32mp_bsec_write()
381 	for (i = otp; i < otp + nb_otp; i++) {  in stm32mp_bsec_write()
382 		u32 *val = &((u32 *)buf)[i - otp];  in stm32mp_bsec_write()
403 	plat->base = (u32)dev_read_addr_ptr(dev);  in stm32mp_bsec_ofdata_to_platdata()
409 	{ .compatible = "st,stm32mp-bsec" },