blob: 9cc1111234a16f723519281bbd3fd4f7aae7a531 [file] [log] [blame]
Heiko Schocher5abc00d2014-10-31 08:31:04 +01001/*
2 * Copyright (C) 2013 Atmel Corporation
3 * Bo Shen <voice.shen@atmel.com>
4 *
5 * SPDX-License-Identifier: GPL-2.0+
6 */
7
8#include <common.h>
9#include <asm/io.h>
10#include <asm/arch/at91_common.h>
11#include <asm/arch/at91_pit.h>
12#include <asm/arch/at91_pmc.h>
13#include <asm/arch/at91_rstc.h>
14#include <asm/arch/at91_wdt.h>
15#include <asm/arch/clk.h>
16#include <spl.h>
17
18DECLARE_GLOBAL_DATA_PTR;
19
20static void switch_to_main_crystal_osc(void)
21{
22 struct at91_pmc *pmc = (struct at91_pmc *)ATMEL_BASE_PMC;
23 u32 tmp;
24
25 tmp = readl(&pmc->mor);
26 tmp &= ~AT91_PMC_MOR_OSCOUNT(0xff);
27 tmp &= ~AT91_PMC_MOR_KEY(0xff);
28 tmp |= AT91_PMC_MOR_MOSCEN;
29 tmp |= AT91_PMC_MOR_OSCOUNT(8);
30 tmp |= AT91_PMC_MOR_KEY(0x37);
31 writel(tmp, &pmc->mor);
32 while (!(readl(&pmc->sr) & AT91_PMC_IXR_MOSCS))
33 ;
34
35 tmp = readl(&pmc->mor);
36 tmp &= ~AT91_PMC_MOR_OSCBYPASS;
37 tmp &= ~AT91_PMC_MOR_KEY(0xff);
38 tmp |= AT91_PMC_MOR_KEY(0x37);
39 writel(tmp, &pmc->mor);
40
41 tmp = readl(&pmc->mor);
42 tmp |= AT91_PMC_MOR_MOSCSEL;
43 tmp &= ~AT91_PMC_MOR_KEY(0xff);
44 tmp |= AT91_PMC_MOR_KEY(0x37);
45 writel(tmp, &pmc->mor);
46
47 while (!(readl(&pmc->sr) & AT91_PMC_IXR_MOSCSELS))
48 ;
49
50 /* Wait until MAINRDY field is set to make sure main clock is stable */
51 while (!(readl(&pmc->mcfr) & AT91_PMC_MAINRDY))
52 ;
53
Bo Shen0246b7c2014-12-15 13:24:32 +080054#ifndef CONFIG_SAMA5D4
Heiko Schocher5abc00d2014-10-31 08:31:04 +010055 tmp = readl(&pmc->mor);
56 tmp &= ~AT91_PMC_MOR_MOSCRCEN;
57 tmp &= ~AT91_PMC_MOR_KEY(0xff);
58 tmp |= AT91_PMC_MOR_KEY(0x37);
59 writel(tmp, &pmc->mor);
Bo Shen0246b7c2014-12-15 13:24:32 +080060#endif
Heiko Schocher5abc00d2014-10-31 08:31:04 +010061}
62
Bo Shen433be902014-12-15 13:24:30 +080063__weak void matrix_init(void)
64{
65 /* This only be used for sama5d4 soc now */
66}
67
Bo Shen4514b5f2014-12-15 13:24:31 +080068__weak void redirect_int_from_saic_to_aic(void)
69{
70 /* This only be used for sama5d4 soc now */
71}
72
Heiko Schocher5abc00d2014-10-31 08:31:04 +010073void s_init(void)
74{
75 switch_to_main_crystal_osc();
76
77 /* disable watchdog */
78 at91_disable_wdt();
79
80 /* PMC configuration */
81 at91_pmc_init();
82
83 at91_clock_init(CONFIG_SYS_AT91_MAIN_CLOCK);
84
Bo Shen433be902014-12-15 13:24:30 +080085 matrix_init();
86
Bo Shen4514b5f2014-12-15 13:24:31 +080087 redirect_int_from_saic_to_aic();
88
Heiko Schocher5abc00d2014-10-31 08:31:04 +010089 timer_init();
90
91 board_early_init_f();
92
93 preloader_console_init();
94
95 mem_init();
96}