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/*
* (C) Copyright 2015 Google, Inc
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <debug_uart.h>
#include <spl.h>
#include <asm/io.h>
#include <asm/arch/bootrom.h>
#include <asm/arch/pmu_rk3188.h>
DECLARE_GLOBAL_DATA_PTR;
/* track how often we were entered */
static int rk3188_num_entries __attribute__ ((section(".data")));
#define PMU_BASE 0x20004000
#define TPL_ENTRY 0x10080C00
static void jump_to_spl(void)
{
typedef void __noreturn (*image_entry_noargs_t)(void);
struct rk3188_pmu * const pmu = (void *)PMU_BASE;
image_entry_noargs_t tpl_entry =
(image_entry_noargs_t)(unsigned long)TPL_ENTRY;
/* Store the SAVE_SP_ADDR in a location shared with TPL. */
writel(SAVE_SP_ADDR, &pmu->sys_reg[2]);
tpl_entry();
}
void board_init_f(ulong dummy)
{
/* Example code showing how to enable the debug UART on RK3188 */
#ifdef EARLY_UART
#include <asm/arch/grf_rk3188.h>
/* Enable early UART on the RK3188 */
#define GRF_BASE 0x20008000
struct rk3188_grf * const grf = (void *)GRF_BASE;
rk_clrsetreg(&grf->gpio1b_iomux,
GPIO1B1_MASK << GPIO1B1_SHIFT |
GPIO1B0_MASK << GPIO1B0_SHIFT,
GPIO1B1_UART2_SOUT << GPIO1B1_SHIFT |
GPIO1B0_UART2_SIN << GPIO1B0_SHIFT);
/*
* Debug UART can be used from here if required:
*
* debug_uart_init();
* printch('a');
* printhex8(0x1234);
* printascii("string");
*/
debug_uart_init();
printch('t');
printch('p');
printch('l');
printch('-');
printch(rk3188_num_entries + 1 + '0');
printch('\n');
#endif
rk3188_num_entries++;
if (rk3188_num_entries == 1) {
/*
* The original loader did some very basic integrity
* checking at this point, but the remaining few bytes
* could be used for any improvement making sense
* really early on.
*/
back_to_bootrom();
} else {
/*
* TPL part of the loader should now wait for us
* at offset 0xC00 in the sram. Should never return
* from there.
*/
jump_to_spl();
}
}
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