blob: b458ef6ea8b04010d232b6cba437b192885ca79d [file] [log] [blame]
Heiko Stübnerdf9041e2017-02-18 19:46:38 +01001/*
2 * (C) Copyright 2015 Google, Inc
3 *
4 * SPDX-License-Identifier: GPL-2.0+
5 */
6
7#include <common.h>
8#include <debug_uart.h>
9#include <spl.h>
10#include <asm/io.h>
11#include <asm/arch/bootrom.h>
12#include <asm/arch/pmu_rk3188.h>
13
14DECLARE_GLOBAL_DATA_PTR;
15
16/* track how often we were entered */
17static int rk3188_num_entries __attribute__ ((section(".data")));
18
19#define PMU_BASE 0x20004000
Heiko Stübner007a4352017-03-20 12:40:31 +010020#define SPL_ENTRY 0x10080C00
Heiko Stübnerdf9041e2017-02-18 19:46:38 +010021
22static void jump_to_spl(void)
23{
24 typedef void __noreturn (*image_entry_noargs_t)(void);
25
26 struct rk3188_pmu * const pmu = (void *)PMU_BASE;
27 image_entry_noargs_t tpl_entry =
Heiko Stübner007a4352017-03-20 12:40:31 +010028 (image_entry_noargs_t)(unsigned long)SPL_ENTRY;
Heiko Stübnerdf9041e2017-02-18 19:46:38 +010029
Heiko Stübner007a4352017-03-20 12:40:31 +010030 /* Store the SAVE_SP_ADDR in a location shared with SPL. */
Heiko Stübnerdf9041e2017-02-18 19:46:38 +010031 writel(SAVE_SP_ADDR, &pmu->sys_reg[2]);
32 tpl_entry();
33}
34
35void board_init_f(ulong dummy)
36{
37 /* Example code showing how to enable the debug UART on RK3188 */
38#ifdef EARLY_UART
39#include <asm/arch/grf_rk3188.h>
40 /* Enable early UART on the RK3188 */
41#define GRF_BASE 0x20008000
42 struct rk3188_grf * const grf = (void *)GRF_BASE;
43
44 rk_clrsetreg(&grf->gpio1b_iomux,
45 GPIO1B1_MASK << GPIO1B1_SHIFT |
46 GPIO1B0_MASK << GPIO1B0_SHIFT,
47 GPIO1B1_UART2_SOUT << GPIO1B1_SHIFT |
48 GPIO1B0_UART2_SIN << GPIO1B0_SHIFT);
49 /*
50 * Debug UART can be used from here if required:
51 *
52 * debug_uart_init();
53 * printch('a');
54 * printhex8(0x1234);
55 * printascii("string");
56 */
57 debug_uart_init();
58
59 printch('t');
60 printch('p');
61 printch('l');
62 printch('-');
63 printch(rk3188_num_entries + 1 + '0');
64 printch('\n');
65#endif
66
67 rk3188_num_entries++;
68
69 if (rk3188_num_entries == 1) {
70 /*
71 * The original loader did some very basic integrity
72 * checking at this point, but the remaining few bytes
73 * could be used for any improvement making sense
74 * really early on.
75 */
76
77 back_to_bootrom();
78 } else {
79 /*
80 * TPL part of the loader should now wait for us
81 * at offset 0xC00 in the sram. Should never return
82 * from there.
83 */
84 jump_to_spl();
85 }
86}