Blackfin: update on-chip ROM API

This brings the API for the on-chip ROM in line with the toolchain and
hardware documentation.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

2 files changed, 44 insertions, 40 deletions

diff --git a/include/asm-blackfin/mach-common/bits/bootrom.h b/include/asm-blackfin/mach-common/bits/bootrom.h
index bf661f0..fb97ff8 100644
--- a/include/asm-blackfin/mach-common/bits/bootrom.h
+++ b/include/asm-blackfin/mach-common/bits/bootrom.h
@@ -92,14 +92,6 @@
 
 #define BOOTROM_CAPS_ADI_BOOT_STRUCTS 1
 
-/* Not available on initial BF54x or BF52x */
-#if (defined(__ADSPBF54x__) && __SILICON_REVISION__ < 1) || \
-    (defined(__ADSPBF52x__) && __SILICON_REVISION__ < 2)
-#define BOOTROM_CAPS_SYSCONTROL 0
-#else
-#define BOOTROM_CAPS_SYSCONTROL 1
-#endif
-
 #endif
 
 #ifndef BOOTROM_FOLLOWS_C_ABI
@@ -108,9 +100,21 @@
 #ifndef BOOTROM_CAPS_ADI_BOOT_STRUCTS
 #define BOOTROM_CAPS_ADI_BOOT_STRUCTS 0
 #endif
-#ifndef BOOTROM_CAPS_SYSCONTROL
-#define BOOTROM_CAPS_SYSCONTROL 0
-#endif
+
+/* Possible syscontrol action flags */
+#define SYSCTRL_READ        0x00000000    /* read registers */
+#define SYSCTRL_WRITE       0x00000001    /* write registers */
+#define SYSCTRL_SYSRESET    0x00000002    /* perform system reset */
+#define SYSCTRL_CORERESET   0x00000004    /* perform core reset */
+#define SYSCTRL_SOFTRESET   0x00000006    /* perform core and system reset */
+#define SYSCTRL_VRCTL       0x00000010    /* read/write VR_CTL register */
+#define SYSCTRL_EXTVOLTAGE  0x00000020    /* VDDINT supplied externally */
+#define SYSCTRL_INTVOLTAGE  0x00000000    /* VDDINT generated by on-chip regulator */
+#define SYSCTRL_OTPVOLTAGE  0x00000040    /* For Factory Purposes Only */
+#define SYSCTRL_PLLCTL      0x00000100    /* read/write PLL_CTL register */
+#define SYSCTRL_PLLDIV      0x00000200    /* read/write PLL_DIV register */
+#define SYSCTRL_LOCKCNT     0x00000400    /* read/write PLL_LOCKCNT register */
+#define SYSCTRL_PLLSTAT     0x00000800    /* read/write PLL_STAT register */
 
 #ifndef __ASSEMBLY__
 
@@ -132,25 +136,26 @@ typedef struct ADI_SYSCTRL_VALUES {
 #ifndef _BOOTROM_SYSCONTROL
 #define _BOOTROM_SYSCONTROL 0
 #endif
-static uint32_t (* const syscontrol)(uint32_t action_flags, ADI_SYSCTRL_VALUES *power_settings, void *reserved) = (void *)_BOOTROM_SYSCONTROL;
+static uint32_t (* const bfrom_SysControl)(uint32_t action_flags, ADI_SYSCTRL_VALUES *power_settings, void *reserved) = (void *)_BOOTROM_SYSCONTROL;
 
-#endif /* __ASSEMBLY__ */
-
-/* Possible syscontrol action flags */
-#define SYSCTRL_READ        0x00000000    /* read registers */
-#define SYSCTRL_WRITE       0x00000001    /* write registers */
-#define SYSCTRL_SYSRESET    0x00000002    /* perform system reset */
-#define SYSCTRL_SOFTRESET   0x00000004    /* perform core and system reset */
-#define SYSCTRL_VRCTL       0x00000010    /* read/write VR_CTL register */
-#define SYSCTRL_EXTVOLTAGE  0x00000020    /* VDDINT supplied externally */
-#define SYSCTRL_INTVOLTAGE  0x00000000    /* VDDINT generated by on-chip regulator */
-#define SYSCTRL_OTPVOLTAGE  0x00000040    /* For Factory Purposes Only */
-#define SYSCTRL_PLLCTL      0x00000100    /* read/write PLL_CTL register */
-#define SYSCTRL_PLLDIV      0x00000200    /* read/write PLL_DIV register */
-#define SYSCTRL_LOCKCNT     0x00000400    /* read/write PLL_LOCKCNT register */
-#define SYSCTRL_PLLSTAT     0x00000800    /* read/write PLL_STAT register */
-
-#ifndef __ASSEMBLY__
+/* We need a dedicated function since we need to screw with the stack pointer
+ * when resetting.  The on-chip ROM will save/restore registers on the stack
+ * when doing a system reset, so the stack cannot be outside of the chip.
+ */
+__attribute__((__noreturn__))
+static inline void bfrom_SoftReset(void *new_stack)
+{
+	while (1)
+		__asm__ __volatile__(
+			"sp = %[stack];"
+			"jump (%[bfrom_syscontrol]);"
+			: : [bfrom_syscontrol] "p"(bfrom_SysControl),
+				"q0"(SYSCTRL_SOFTRESET),
+				"q1"(0),
+				"q2"(NULL),
+				[stack] "p"(new_stack)
+		);
+}
 
 /* Structures for working with LDRs and boot rom callbacks */
 typedef struct ADI_BOOT_HEADER {
diff --git a/include/asm-blackfin/mach-common/bits/otp.h b/include/asm-blackfin/mach-common/bits/otp.h
index d529a0a..4e3f1af 100644
--- a/include/asm-blackfin/mach-common/bits/otp.h
+++ b/include/asm-blackfin/mach-common/bits/otp.h
@@ -9,23 +9,22 @@
 
 #include "bootrom.h"
 
-static uint32_t (* const otp_command)(uint32_t command, uint32_t value) = (void *)_BOOTROM_OTP_COMMAND;
-static uint32_t (* const otp_read)(uint32_t page, uint32_t flags, uint64_t *page_content) = (void *)_BOOTROM_OTP_READ;
-static uint32_t (* const otp_write)(uint32_t page, uint32_t flags, uint64_t *page_content) = (void *)_BOOTROM_OTP_WRITE;
+static uint32_t (* const bfrom_OtpCommand)(uint32_t command, uint32_t value) = (void *)_BOOTROM_OTP_COMMAND;
+static uint32_t (* const bfrom_OtpRead)(uint32_t page, uint32_t flags, uint64_t *page_content) = (void *)_BOOTROM_OTP_READ;
+static uint32_t (* const bfrom_OtpWrite)(uint32_t page, uint32_t flags, uint64_t *page_content) = (void *)_BOOTROM_OTP_WRITE;
 
 #endif
 
 /* otp_command(): defines for "command" */
-#define OTP_INIT             0x00000001
-#define OTP_CLOSE            0x00000002
+#define OTP_INIT                 0x00000001
+#define OTP_CLOSE                0x00000002
 
 /* otp_{read,write}(): defines for "flags" */
-#define OTP_LOWER_HALF       0x00000000 /* select upper/lower 64-bit half (bit 0) */
-#define OTP_UPPER_HALF       0x00000001
-#define OTP_NO_ECC           0x00000010 /* do not use ECC */
-#define OTP_LOCK             0x00000020 /* sets page protection bit for page */
-#define OTP_ACCESS_READ      0x00001000
-#define OTP_ACCESS_READWRITE 0x00002000
+#define OTP_LOWER_HALF           0x00000000 /* select upper/lower 64-bit half (bit 0) */
+#define OTP_UPPER_HALF           0x00000001
+#define OTP_NO_ECC               0x00000010 /* do not use ECC */
+#define OTP_LOCK                 0x00000020 /* sets page protection bit for page */
+#define OTP_CHECK_FOR_PREV_WRITE 0x00000080
 
 /* Return values for all functions */
 #define OTP_SUCCESS          0x00000000