Re: [RESEND PATCH v3] mtd: rawnand: macronix: OTP access for MX30LFxG18AC

From: Arseniy Krasnov
Date: Mon Jun 05 2023 - 02:20:55 EST

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Hello all guys!

Sorry, ping, FYI there is v4:
https://lore.kernel.org/linux-mtd/20230523101637.3009746-1-AVKrasnov@xxxxxxxxxxxxxx/

Thanks, Arseniy

On 25.05.2023 10:02, Arseniy Krasnov wrote:
>
>
> On 24.05.2023 10:13, Arseniy Krasnov wrote:
>>
>>
>> On 24.05.2023 09:33, liao jaime wrote:
>>> Hi Miquel
>>>
>>>>
>>>> Hi Arseniy,
>>>>
>>>> avkrasnov@xxxxxxxxxxxxxx wrote on Mon, 15 May 2023 12:49:50 +0300:
>>>>
>>>>> Hello @Miquel!
>>>>>
>>>>> Sorry, but who could review this patch? :) IIUC this logic is very hw specific and we need
>>>>> someone who knows it well? I tested this patch on our devices (with already known Meson NAND
>>>>> controller).
>>>>
>>>> + Jaime, who might test
>>>>
>>>>>
>>>>> Thanks, Arseniy
>>>>>
>>>>> On 11.05.2023 21:21, Arseniy Krasnov wrote:
>>>>>> Cc: Mason Yang <masonccyang@xxxxxxxxxxx> and Boris Brezillon <boris.brezillon@xxxxxxxxxxxxx>
>>>>>>
>>>>>> On 11.05.2023 18:21, Arseniy Krasnov wrote:
>>>>>>> This adds support for OTP area access on MX30LFxG18AC chip series.
>>>>>>>
>>>>>>> Changelog:
>>>>>>> v1 -> v2:
>>>>>>> * Add slab.h include due to kernel test robot error.
>>>>>>> v2 -> v3:
>>>>>>> * Use 'uint64_t' as input argument for 'do_div()' instead
>>>>>>> of 'unsigned long' due to kernel test robot error.
>>>>>>>
>>>>>>> Signed-off-by: Arseniy Krasnov <AVKrasnov@xxxxxxxxxxxxxx>
>>>>>>> ---
>>>>>>> drivers/mtd/nand/raw/nand_macronix.c | 213 +++++++++++++++++++++++++++
>>>>>>> 1 file changed, 213 insertions(+)
>>>>>>>
>>>>>>> diff --git a/drivers/mtd/nand/raw/nand_macronix.c b/drivers/mtd/nand/raw/nand_macronix.c
>>>>>>> index 1472f925f386..2301f990678e 100644
>>>>>>> --- a/drivers/mtd/nand/raw/nand_macronix.c
>>>>>>> +++ b/drivers/mtd/nand/raw/nand_macronix.c
>>>>>>> @@ -6,6 +6,7 @@
>>>>>>> * Author: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxxxxxxx>
>>>>>>> */
>>>>>>>
>>>>>>> +#include <linux/slab.h>
>>>>>>> #include "linux/delay.h"
>>>>>>> #include "internals.h"
>>>>>>>
>>>>>>> @@ -31,6 +32,20 @@
>>>>>>>
>>>>>>> #define MXIC_CMD_POWER_DOWN 0xB9
>>>>>>>
>>>>>>> +#define ONFI_FEATURE_ADDR_30LFXG18AC_OTP 0x90
>>>>>>> +#define MACRONIX_30LFXG18AC_OTP_START_PAGE 0
>>>>>>> +#define MACRONIX_30LFXG18AC_OTP_PAGES 30
>>>>>>> +#define MACRONIX_30LFXG18AC_OTP_PAGE_SIZE 2112
>>>>>>> +#define MACRONIX_30LFXG18AC_OTP_START_BYTE \
>>>>>>> + (MACRONIX_30LFXG18AC_OTP_START_PAGE * \
>>>>>>> + MACRONIX_30LFXG18AC_OTP_PAGE_SIZE)
>>>>>>> +#define MACRONIX_30LFXG18AC_OTP_SIZE_BYTES \
>>>>>>> + (MACRONIX_30LFXG18AC_OTP_PAGES * \
>>>>>>> + MACRONIX_30LFXG18AC_OTP_PAGE_SIZE)
>>>>>>> +
>>>>>>> +#define MACRONIX_30LFXG18AC_OTP_EN BIT(0)
>>>>>>> +#define MACRONIX_30LFXG18AC_OTP_LOCKED BIT(1)
>>>>>>> +
>>>>>>> struct nand_onfi_vendor_macronix {
>>>>>>> u8 reserved;
>>>>>>> u8 reliability_func;
>>>>>>> @@ -316,6 +331,203 @@ static void macronix_nand_deep_power_down_support(struct nand_chip *chip)
>>>>>>> chip->ops.resume = mxic_nand_resume;
>>>>>>> }
>>>>>>>
>>>>>>> +static int macronix_30lfxg18ac_get_otp_info(struct mtd_info *mtd, size_t len,
>>>>>>> + size_t *retlen,
>>>>>>> + struct otp_info *buf)
>>>>>>> +{
>>>>>>> + if (len < sizeof(*buf))
>>>>>>> + return -EINVAL;
>>>>>>> +
>>>>>>> + /* Don't know how to check that OTP is locked. */
>>>>
>>>> Jaime, any idea?
>>>
>>> OTP info could be check by GET_FEATURE command.
>>> GET_FEATURE command with address 90h could read sub-feature
>>> parameter table, P1 is "3" means OTP protection.
>>>
>>> Thanks
>>> Jaime
>>>
>>
>> Hello Jaime, thanks for quick reply!
>>
>> I have two devices - with locked and unlocked OTP. I call the following thing for each of them:
>>
>> @@ -339,6 +341,26 @@ static int macronix_30lfxg18ac_get_otp_info(struct mtd_info *mtd, size_t len,
>> return -EINVAL;
>>
>> /* Don't know how to check that OTP is locked. */
>> + {
>> + u8 feature_buf[ONFI_SUBFEATURE_PARAM_LEN] = { 0 };
>> + struct nand_chip *nand;
>> + int res;
>> +
>> + nand = mtd_to_nand(mtd);
>> +
>> + nand_select_target(nand, 0);
>> +
>> + res = nand_get_features(nand, 0x90, feature_buf);
>> +
>> + nand_deselect_target(nand);
>> +
>> + printk(KERN_EMERG "\n\nRES %i OTP BUF %hhx %hhx %hhx %hhx\n\n\n",
>> + res,
>> + feature_buf[0],
>> + feature_buf[1],
>> + feature_buf[2],
>> + feature_buf[3]);
>> + }
>> buf->locked = 0;
>> buf->start = MACRONIX_30LFXG18AC_OTP_START_BYTE;
>> buf->length = MACRONIX_30LFXG18AC_OTP_SIZE_BYTES;
>>
>> And get for both devices:
>>
>> [ 4.228721] RES 0 OTP BUF 0 0 0 0
>>
>> May be i'm doing something wrong?
>>
>> Thanks, Arseniy
>
> Small upd: I tried to
>
> 1) Call 'nand_get_features()' when OTP mode is enabled, it just returns 1 0 0 0 (e.g. OTP mode enabled, on both locked and unlocked devs).
> 2) Increase timings and delays in NAND controller driver - it didn't help.
>
> Anyway, I see, that OTP status (enabled or disabled) is returned successfully, but locked status is always missed.
>
> Thanks, Arseniy
>
>>
>>>>
>>>>>>> + buf->locked = 0;
>>>>>>> + buf->start = MACRONIX_30LFXG18AC_OTP_START_BYTE;
>>>>>>> + buf->length = MACRONIX_30LFXG18AC_OTP_SIZE_BYTES;
>>>>>>> +
>>>>>>> + *retlen = sizeof(*buf);
>>>>>>> +
>>>>>>> + return 0;
>>>>>>> +}
>>>>>>> +
>>>>>>> +static int macronix_30lfxg18ac_otp_enable(struct nand_chip *nand)
>>>>>>> +{
>>>>>>> + uint8_t feature_buf[ONFI_SUBFEATURE_PARAM_LEN] = { 0 };
>>>>>>> +
>>>>>>> + feature_buf[0] = MACRONIX_30LFXG18AC_OTP_EN;
>>>>>>> + return nand_set_features(nand, ONFI_FEATURE_ADDR_30LFXG18AC_OTP,
>>>>>>> + feature_buf);
>>>>>>> +}
>>>>>>> +
>>>>>>> +static int macronix_30lfxg18ac_otp_disable(struct nand_chip *nand)
>>>>>>> +{
>>>>>>> + uint8_t feature_buf[ONFI_SUBFEATURE_PARAM_LEN] = { 0 };
>>>>>>> +
>>>>>>> + return nand_set_features(nand, ONFI_FEATURE_ADDR_30LFXG18AC_OTP,
>>>>>>> + feature_buf);
>>>>>>> +}
>>>>>>> +
>>>>>>> +static int __macronix_30lfxg18ac_rw_otp(struct mtd_info *mtd,
>>>>>>> + loff_t offs_in_flash,
>>>>>>> + size_t len, size_t *retlen,
>>>>>>> + u_char *buf, bool write)
>>>>>>> +{
>>>>>>> + struct nand_chip *nand;
>>>>>>> + size_t bytes_handled;
>>>>>>> + off_t offs_in_page;
>>>>>>> + uint64_t page;
>>>>>>> + void *dma_buf;
>>>>>>> + int ret;
>>>>>>> +
>>>>>>> + /* 'nand_prog/read_page_op()' may use 'buf' as DMA buffer,
>>>>>>> + * so allocate properly aligned memory for it. This is
>>>>>>> + * needed because cross page accesses may lead to unaligned
>>>>>>> + * buffer address for DMA.
>>>>>>> + */
>>>>>>> + dma_buf = kmalloc(MACRONIX_30LFXG18AC_OTP_PAGE_SIZE, GFP_KERNEL);
>>>>>>> + if (!dma_buf)
>>>>>>> + return -ENOMEM;
>>>>>>> +
>>>>>>> + nand = mtd_to_nand(mtd);
>>>>>>> + nand_select_target(nand, 0);
>>>>>>> +
>>>>>>> + ret = macronix_30lfxg18ac_otp_enable(nand);
>>>>>>> + if (ret)
>>>>>>> + goto out_otp;
>>>>>>> +
>>>>>>> + page = offs_in_flash;
>>>>>>> + /* 'page' will be result of division. */
>>>>>>> + offs_in_page = do_div(page, MACRONIX_30LFXG18AC_OTP_PAGE_SIZE);
>>>>>>> + bytes_handled = 0;
>>>>>>> +
>>>>>>> + while (bytes_handled < len &&
>>>>>>> + page < MACRONIX_30LFXG18AC_OTP_PAGES) {
>>>>>>> + size_t bytes_to_handle;
>>>>>>> +
>>>>>>> + bytes_to_handle = min_t(size_t, len - bytes_handled,
>>>>>>> + MACRONIX_30LFXG18AC_OTP_PAGE_SIZE -
>>>>>>> + offs_in_page);
>>>>>>> +
>>>>>>> + if (write) {
>>>>>>> + memcpy(dma_buf, &buf[bytes_handled], bytes_to_handle);
>>>>>>> + ret = nand_prog_page_op(nand, page, offs_in_page,
>>>>>>> + dma_buf, bytes_to_handle);
>>>>>>> + } else {
>>>>>>> + ret = nand_read_page_op(nand, page, offs_in_page,
>>>>>>> + dma_buf, bytes_to_handle);
>>>>>>> + if (!ret)
>>>>>>> + memcpy(&buf[bytes_handled], dma_buf,
>>>>>>> + bytes_to_handle);
>>>>>>> + }
>>>>>>> + if (ret)
>>>>>>> + goto out_otp;
>>>>>>> +
>>>>>>> + bytes_handled += bytes_to_handle;
>>>>>>> + offs_in_page = 0;
>>>>>>> + page++;
>>>>>>> + }
>>>>>>> +
>>>>>>> + *retlen = bytes_handled;
>>>>>>> +
>>>>>>> +out_otp:
>>>>>>> + if (ret)
>>>>>>> + dev_err(&mtd->dev, "failed to perform OTP IO: %i\n", ret);
>>>>>>> +
>>>>>>> + ret = macronix_30lfxg18ac_otp_disable(nand);
>>>>>>> + WARN(ret, "failed to leave OTP mode after %s\n",
>>>>>>> + write ? "write" : "read");
>>>>
>>>> Let's avoid WARN() calls (none in this driver are relevant IMHO). Just a
>>>> dev_err() should be enough.
>>>>
>>>>>>> + nand_deselect_target(nand);
>>>>>>> + kfree(dma_buf);
>>>>>>> +
>>>>>>> + return ret;
>>>>>>> +}
>>>>>>> +
>>>>>>> +static int macronix_30lfxg18ac_write_otp(struct mtd_info *mtd, loff_t to,
>>>>>>> + size_t len, size_t *rlen,
>>>>>>> + const u_char *buf)
>>>>>>> +{
>>>>>>> + return __macronix_30lfxg18ac_rw_otp(mtd, to, len, rlen, (u_char *)buf,
>>>>>>> + true);
>>>>>>> +}
>>>>>>> +
>>>>>>> +static int macronix_30lfxg18ac_read_otp(struct mtd_info *mtd, loff_t from,
>>>>>>> + size_t len, size_t *rlen,
>>>>>>> + u_char *buf)
>>>>>>> +{
>>>>>>> + return __macronix_30lfxg18ac_rw_otp(mtd, from, len, rlen, buf, false);
>>>>>>> +}
>>>>>>> +
>>>>>>> +static int macronix_30lfxg18ac_lock_otp(struct mtd_info *mtd, loff_t from,
>>>>>>> + size_t len)
>>>>>>> +{
>>>>>>> + uint8_t feature_buf[ONFI_SUBFEATURE_PARAM_LEN] = { 0 };
>>>>>>> + struct nand_chip *nand;
>>>>>>> + int ret;
>>>>>>> +
>>>>>>> + if (from != MACRONIX_30LFXG18AC_OTP_START_BYTE ||
>>>>>>> + len != MACRONIX_30LFXG18AC_OTP_SIZE_BYTES)
>>>>>>> + return -EINVAL;
>>>>>>> +
>>>>>>> + dev_dbg(&mtd->dev, "locking OTP\n");
>>>>>>> +
>>>>>>> + nand = mtd_to_nand(mtd);
>>>>>>> + nand_select_target(nand, 0);
>>>>>>> +
>>>>>>> + feature_buf[0] = MACRONIX_30LFXG18AC_OTP_EN |
>>>>>>> + MACRONIX_30LFXG18AC_OTP_LOCKED;
>>>>>>> + ret = nand_set_features(nand, ONFI_FEATURE_ADDR_30LFXG18AC_OTP,
>>>>>>> + feature_buf);
>>>>>>> + if (ret) {
>>>>>>> + dev_err(&mtd->dev,
>>>>>>> + "failed to lock OTP (set features): %i\n", ret);
>>>>>>> + nand_deselect_target(nand);
>>>>>>> + return ret;
>>>>>>> + }
>>>>>>> +
>>>>>>> + /* Do dummy page prog with zero address. */
>>>>>>> + feature_buf[0] = 0;
>>>>>>> + ret = nand_prog_page_op(nand, 0, 0, feature_buf, 1);
>>>>>>> + if (ret)
>>>>>>> + dev_err(&mtd->dev,
>>>>>>> + "failed to lock OTP (page prog): %i\n", ret);
>>>>>>> +
>>>>>>> + ret = macronix_30lfxg18ac_otp_disable(nand);
>>>>>>> + WARN(ret, "failed to leave OTP mode after lock\n");
>>>>>>> +
>>>>>>> + nand_deselect_target(nand);
>>>>>>> +
>>>>>>> + return ret;
>>>>>>> +}
>>>>>>> +
>>>>>>> +static void macronix_nand_setup_otp(struct nand_chip *chip)
>>>>>>> +{
>>>>>>> + static const char * const supported_otp_models[] = {
>>>>>>> + "MX30LF1G18AC",
>>>>>>> + "MX30LF2G18AC",
>>>>>>> + "MX30LF4G18AC",
>>>>>>> + };
>>>>>>> + struct mtd_info *mtd;
>>>>>>> +
>>>>>>> + if (!chip->parameters.supports_set_get_features)
>>>>>>> + return;
>>>>>>> +
>>>>>>> + if (match_string(supported_otp_models,
>>>>>>> + ARRAY_SIZE(supported_otp_models),
>>>>>>> + chip->parameters.model) < 0)
>>>>>>> + return;
>>>>
>>>> I would start by checking the model, then it's list of supported ops.
>>>>
>>>>>>> +
>>>>>>> + bitmap_set(chip->parameters.get_feature_list,
>>>>>>> + ONFI_FEATURE_ADDR_30LFXG18AC_OTP, 1);
>>>>>>> + bitmap_set(chip->parameters.set_feature_list,
>>>>>>> + ONFI_FEATURE_ADDR_30LFXG18AC_OTP, 1);
>>>>>>> +
>>>>>>> + mtd = nand_to_mtd(chip);
>>>>>>> + mtd->_get_fact_prot_info = macronix_30lfxg18ac_get_otp_info;
>>>>>>> + mtd->_read_fact_prot_reg = macronix_30lfxg18ac_read_otp;
>>>>>>> + mtd->_get_user_prot_info = macronix_30lfxg18ac_get_otp_info;
>>>>>>> + mtd->_read_user_prot_reg = macronix_30lfxg18ac_read_otp;
>>>>>>> + mtd->_write_user_prot_reg = macronix_30lfxg18ac_write_otp;
>>>>>>> + mtd->_lock_user_prot_reg = macronix_30lfxg18ac_lock_otp;
>>>>>>> +}
>>>>>>> +
>>>>>>> static int macronix_nand_init(struct nand_chip *chip)
>>>>>>> {
>>>>>>> if (nand_is_slc(chip))
>>>>>>> @@ -325,6 +537,7 @@ static int macronix_nand_init(struct nand_chip *chip)
>>>>>>> macronix_nand_onfi_init(chip);
>>>>>>> macronix_nand_block_protection_support(chip);
>>>>>>> macronix_nand_deep_power_down_support(chip);
>>>>>>> + macronix_nand_setup_otp(chip);
>>>>>>>
>>>>>>> return 0;
>>>>>>> }
>>>>
>>>>
>>>> Thanks,
>>>> Miquèl

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