1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * board/renesas/spider/spider.c
4  *     This file is Spider board support.
5  *
6  * Copyright (C) 2021 Renesas Electronics Corp.
7  */
8 
9 #include <common.h>
10 #include <asm/arch/rmobile.h>
11 #include <asm/arch/sys_proto.h>
12 #include <asm/global_data.h>
13 #include <asm/io.h>
14 #include <asm/mach-types.h>
15 #include <asm/processor.h>
16 #include <asm/system.h>
17 #include <linux/errno.h>
18 
19 DECLARE_GLOBAL_DATA_PTR;
20 
init_generic_timer(void)21 static void init_generic_timer(void)
22 {
23 	const u32 freq = CONFIG_SYS_CLK_FREQ;
24 
25 	/* Update memory mapped and register based freqency */
26 	asm volatile ("msr cntfrq_el0, %0" :: "r" (freq));
27 	writel(freq, CNTFID0);
28 
29 	/* Enable counter */
30 	setbits_le32(CNTCR_BASE, CNTCR_EN);
31 }
32 
init_gic_v3(void)33 static void init_gic_v3(void)
34 {
35 	 /* GIC v3 power on */
36 	writel(BIT(1), GICR_LPI_PWRR);
37 
38 	/* Wait till the WAKER_CA_BIT changes to 0 */
39 	clrbits_le32(GICR_LPI_WAKER, BIT(1));
40 	while (readl(GICR_LPI_WAKER) & BIT(2))
41 		;
42 
43 	writel(0xffffffff, GICR_SGI_BASE + GICR_IGROUPR0);
44 }
45 
s_init(void)46 void s_init(void)
47 {
48 	if (current_el() == 3)
49 		init_generic_timer();
50 }
51 
board_early_init_f(void)52 int board_early_init_f(void)
53 {
54 	/* Unlock CPG access */
55 	writel(0x5A5AFFFF, CPGWPR);
56 	writel(0xA5A50000, CPGWPCR);
57 
58 	return 0;
59 }
60 
board_init(void)61 int board_init(void)
62 {
63 	if (current_el() == 3)
64 		init_gic_v3();
65 
66 	return 0;
67 }
68 
reset_cpu(void)69 void reset_cpu(void)
70 {
71 	writel(RST_SPRES, RST_SRESCR0);
72 }
73