bfrom.h

/* Blackfin on-chip ROM API
 *
 * Copyright 2008 Analog Devices Inc.
 *
 * Licensed under the GPL-2 or later.
 */

#ifndef __BFROM_H__
#define __BFROM_H__

#include <linux/types.h>

/* 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 */

typedef struct ADI_SYSCTRL_VALUES {
	uint16_t uwVrCtl;
	uint16_t uwPllCtl;
	uint16_t uwPllDiv;
	uint16_t uwPllLockCnt;
	uint16_t uwPllStat;
} ADI_SYSCTRL_VALUES;

static uint32_t (* const bfrom_SysControl)(uint32_t action_flags, ADI_SYSCTRL_VALUES *power_settings, void *reserved) = (void *)0xEF000038;

/* 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)
		/*
		 * We don't declare the SP as clobbered on purpose, since
		 * it confuses the heck out of the compiler, and this function
		 * never returns
		 */
		__asm__ __volatile__(
			"sp = %[stack];"
			"jump (%[bfrom_syscontrol]);"
			: : [bfrom_syscontrol] "p"(bfrom_SysControl),
				"q0"(SYSCTRL_SOFTRESET),
				"q1"(0),
				"q2"(NULL),
				[stack] "p"(new_stack)
		);
}

/* OTP Functions */
static uint32_t (* const bfrom_OtpCommand)(uint32_t command, uint32_t value) = (void *)0xEF000018;
static uint32_t (* const bfrom_OtpRead)(uint32_t page, uint32_t flags, uint64_t *page_content) = (void *)0xEF00001A;
static uint32_t (* const bfrom_OtpWrite)(uint32_t page, uint32_t flags, uint64_t *page_content) = (void *)0xEF00001C;

/* otp command: defines for "command" */
#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_CHECK_FOR_PREV_WRITE 0x00000080

/* Return values for all functions */
#define OTP_SUCCESS          0x00000000
#define OTP_MASTER_ERROR     0x001
#define OTP_WRITE_ERROR      0x003
#define OTP_READ_ERROR       0x005
#define OTP_ACC_VIO_ERROR    0x009
#define OTP_DATA_MULT_ERROR  0x011
#define OTP_ECC_MULT_ERROR   0x021
#define OTP_PREV_WR_ERROR    0x041
#define OTP_DATA_SB_WARN     0x100
#define OTP_ECC_SB_WARN      0x200

#endif