arm: stm32mp: introduced read_close_status function in stm32key command

Split the read_hash_otp function and introduce the helper function
read_close_status to read the close status in OTP separately of the PKH.

This patch is a preliminary step for STM32MP13 support.

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>

diff --git a/arch/arm/mach-stm32mp/cmd_stm32key.c b/arch/arm/mach-stm32mp/cmd_stm32key.c
index 1899d91..68f9b1a 100644 (file)
--- a/arch/arm/mach-stm32mp/cmd_stm32key.c
+++ b/arch/arm/mach-stm32mp/cmd_stm32key.c
@@ -45,18 +45,13 @@ static void read_hash_value(u32 addr)
        }
 }
 
-static int read_hash_otp(bool print, bool *locked, bool *closed)
+static int read_hash_otp(struct udevice *dev, bool print, bool *locked)
 {
-       struct udevice *dev;
        int i, word, ret;
        int nb_invalid = 0, nb_zero = 0, nb_lock = 0;
        u32 val, lock;
        bool status;
 
-       ret = get_misc_dev(&dev);
-       if (ret)
-               return ret;
-
        for (i = 0, word = STM32_OTP_HASH_KEY_START; i < STM32_OTP_HASH_KEY_SIZE; i++, word++) {
                ret = misc_read(dev, STM32_BSEC_OTP(word), &val, 4);
                if (ret != 4)
@@ -74,20 +69,6 @@ static int read_hash_otp(bool print, bool *locked, bool *closed)
                        nb_lock++;
        }
 
-       word = STM32_OTP_CLOSE_ID;
-       ret = misc_read(dev, STM32_BSEC_OTP(word), &val, 4);
-       if (ret != 4)
-               val = 0x0;
-       ret = misc_read(dev, STM32_BSEC_LOCK(word), &lock, 4);
-       if (ret != 4)
-               lock = BSEC_LOCK_ERROR;
-
-       status = (val & STM32_OTP_CLOSE_MASK) == STM32_OTP_CLOSE_MASK;
-       if (closed)
-               *closed = status;
-       if (print)
-               printf("OTP %d: closed status: %d lock : %x\n", word, status, lock);
-
        status = (nb_lock == STM32_OTP_HASH_KEY_SIZE);
        if (locked)
                *locked = status;
@@ -108,16 +89,40 @@ static int read_hash_otp(bool print, bool *locked, bool *closed)
        return 0;
 }
 
-static int fuse_hash_value(u32 addr, bool print)
+static int read_close_status(struct udevice *dev, bool print, bool *closed)
+{
+       int word, ret, result;
+       u32 val, lock;
+       bool status;
+
+       result = 0;
+       word = STM32_OTP_CLOSE_ID;
+       ret = misc_read(dev, STM32_BSEC_OTP(word), &val, 4);
+       if (ret < 0)
+               result = ret;
+       if (ret != 4)
+               val = 0x0;
+
+       ret = misc_read(dev, STM32_BSEC_LOCK(word), &lock, 4);
+       if (ret < 0)
+               result = ret;
+       if (ret != 4)
+               lock = BSEC_LOCK_ERROR;
+
+       status = (val & STM32_OTP_CLOSE_MASK) == STM32_OTP_CLOSE_MASK;
+       if (closed)
+               *closed = status;
+       if (print)
+               printf("OTP %d: closed status: %d lock : %x\n", word, status, lock);
+
+       return result;
+}
+
+static int fuse_hash_value(struct udevice *dev, u32 addr, bool print)
 {
-       struct udevice *dev;
        u32 word, val;
        int i, ret;
 
-       ret = get_misc_dev(&dev);
-       if (ret)
-               return ret;
-
        for (i = 0, word = STM32_OTP_HASH_KEY_START;
             i < STM32_OTP_HASH_KEY_SIZE;
             i++, word++, addr += 4) {
@@ -158,10 +163,20 @@ static int confirm_prog(void)
 
 static int do_stm32key_read(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 {
+       struct udevice *dev;
        u32 addr;
+       int ret;
+
+       ret = get_misc_dev(&dev);
 
        if (argc == 1) {
-               read_hash_otp(true, NULL, NULL);
+               if (ret)
+                       return CMD_RET_FAILURE;
+               read_hash_otp(dev, true, NULL);
+               ret = read_close_status(dev, true, NULL);
+               if (ret)
+                       return CMD_RET_FAILURE;
+
                return CMD_RET_SUCCESS;
        }
 
@@ -176,8 +191,10 @@ static int do_stm32key_read(struct cmd_tbl *cmdtp, int flag, int argc, char *con
 
 static int do_stm32key_fuse(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 {
+       struct udevice *dev;
        u32 addr;
-       bool yes = false, lock, closed;
+       int ret;
+       bool yes = false, lock;
 
        if (argc < 2)
                return CMD_RET_USAGE;
@@ -192,20 +209,23 @@ static int do_stm32key_fuse(struct cmd_tbl *cmdtp, int flag, int argc, char *con
        if (!addr)
                return CMD_RET_USAGE;
 
-       if (read_hash_otp(!yes, &lock, &closed) != -ENOENT) {
+       ret = get_misc_dev(&dev);
+       if (ret)
+               return CMD_RET_FAILURE;
+
+       if (read_hash_otp(dev, !yes, &lock) != -ENOENT) {
                printf("Error: can't fuse again the OTP\n");
                return CMD_RET_FAILURE;
        }
-
-       if (lock || closed) {
-               printf("Error: invalid OTP configuration (lock=%d, closed=%d)\n", lock, closed);
+       if (lock) {
+               printf("Error: PKH is locked\n");
                return CMD_RET_FAILURE;
        }
 
        if (!yes && !confirm_prog())
                return CMD_RET_FAILURE;
 
-       if (fuse_hash_value(addr, !yes))
+       if (fuse_hash_value(dev, addr, !yes))
                return CMD_RET_FAILURE;
 
        printf("Hash key updated !\n");
@@ -227,28 +247,31 @@ static int do_stm32key_close(struct cmd_tbl *cmdtp, int flag, int argc, char *co
                yes = true;
        }
 
-       ret = read_hash_otp(!yes, &lock, &closed);
-       if (ret) {
-               if (ret == -ENOENT)
-                       printf("Error: OTP not programmed!\n");
+       ret = get_misc_dev(&dev);
+       if (ret)
+               return CMD_RET_FAILURE;
+
+       if (read_close_status(dev, !yes, &closed))
                return CMD_RET_FAILURE;
-       }
 
        if (closed) {
                printf("Error: already closed!\n");
                return CMD_RET_FAILURE;
        }
 
+       /* check PKH status before to close */
+       ret = read_hash_otp(dev, !yes, &lock);
+       if (ret) {
+               if (ret == -ENOENT)
+                       printf("Error: OTP not programmed!\n");
+               return CMD_RET_FAILURE;
+       }
        if (!lock)
                printf("Warning: OTP not locked!\n");
 
        if (!yes && !confirm_prog())
                return CMD_RET_FAILURE;
 
-       ret = get_misc_dev(&dev);
-       if (ret)
-               return CMD_RET_FAILURE;
-
        val = STM32_OTP_CLOSE_MASK;
        ret = misc_write(dev, STM32_BSEC_OTP(STM32_OTP_CLOSE_ID), &val, 4);
        if (ret != 4) {