1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * (C) Copyright 2017 Theobroma Systems Design und Consulting GmbH
4  */
5 
6 #include <common.h>
7 #include <debug_uart.h>
8 #include <dm.h>
9 #include <ram.h>
10 #include <spl.h>
11 #include <syscon.h>
12 #include <asm/io.h>
13 #include <asm/arch/bootrom.h>
14 #include <asm/arch/clock.h>
15 #include <asm/arch/cru_rk3368.h>
16 #include <asm/arch/grf_rk3368.h>
17 #include <asm/arch/hardware.h>
18 #include <asm/arch/timer.h>
19 
20 /*
21  * The SPL (and also the full U-Boot stage on the RK3368) will run in
22  * secure mode (i.e. EL3) and an ATF will eventually be booted before
23  * starting up the operating system... so we can initialize the SGRF
24  * here and rely on the ATF installing the final (secure) policy
25  * later.
26  */
27 static inline uintptr_t sgrf_soc_con_addr(unsigned no)
28 {
29 	const uintptr_t SGRF_BASE =
30 		(uintptr_t)syscon_get_first_range(ROCKCHIP_SYSCON_SGRF);
31 
32 	return SGRF_BASE + sizeof(u32) * no;
33 }
34 
35 static inline uintptr_t sgrf_busdmac_addr(unsigned no)
36 {
37 	const uintptr_t SGRF_BASE =
38 		(uintptr_t)syscon_get_first_range(ROCKCHIP_SYSCON_SGRF);
39 	const uintptr_t SGRF_BUSDMAC_OFFSET = 0x100;
40 	const uintptr_t SGRF_BUSDMAC_BASE = SGRF_BASE + SGRF_BUSDMAC_OFFSET;
41 
42 	return SGRF_BUSDMAC_BASE + sizeof(u32) * no;
43 }
44 
45 static void sgrf_init(void)
46 {
47 	struct rk3368_cru * const cru =
48 		(struct rk3368_cru * const)rockchip_get_cru();
49 	const u16 SGRF_SOC_CON_SEC = GENMASK(15, 0);
50 	const u16 SGRF_BUSDMAC_CON0_SEC = BIT(2);
51 	const u16 SGRF_BUSDMAC_CON1_SEC = GENMASK(15, 12);
52 
53 	/* Set all configurable IP to 'non secure'-mode */
54 	rk_setreg(sgrf_soc_con_addr(5), SGRF_SOC_CON_SEC);
55 	rk_setreg(sgrf_soc_con_addr(6), SGRF_SOC_CON_SEC);
56 	rk_setreg(sgrf_soc_con_addr(7), SGRF_SOC_CON_SEC);
57 
58 	/*
59 	 * From rockchip-uboot/arch/arm/cpu/armv8/rk33xx/cpu.c
60 	 * Original comment: "ddr space set no secure mode"
61 	 */
62 	rk_clrreg(sgrf_soc_con_addr(8), SGRF_SOC_CON_SEC);
63 	rk_clrreg(sgrf_soc_con_addr(9), SGRF_SOC_CON_SEC);
64 	rk_clrreg(sgrf_soc_con_addr(10), SGRF_SOC_CON_SEC);
65 
66 	/* Set 'secure dma' to 'non secure'-mode */
67 	rk_setreg(sgrf_busdmac_addr(0), SGRF_BUSDMAC_CON0_SEC);
68 	rk_setreg(sgrf_busdmac_addr(1), SGRF_BUSDMAC_CON1_SEC);
69 
70 	dsb();  /* barrier */
71 
72 	rk_setreg(&cru->softrst_con[1], DMA1_SRST_REQ);
73 	rk_setreg(&cru->softrst_con[4], DMA2_SRST_REQ);
74 
75 	dsb();  /* barrier */
76 	udelay(10);
77 
78 	rk_clrreg(&cru->softrst_con[1], DMA1_SRST_REQ);
79 	rk_clrreg(&cru->softrst_con[4], DMA2_SRST_REQ);
80 }
81 
82 void board_debug_uart_init(void)
83 {
84 	/*
85 	 * N.B.: This is called before the device-model has been
86 	 *       initialised. For this reason, we can not access
87 	 *       the GRF address range using the syscon API.
88 	 */
89 	struct rk3368_grf * const grf =
90 		(struct rk3368_grf * const)0xff770000;
91 
92 	enum {
93 		GPIO2D1_MASK            = GENMASK(3, 2),
94 		GPIO2D1_GPIO            = 0,
95 		GPIO2D1_UART0_SOUT      = (1 << 2),
96 
97 		GPIO2D0_MASK            = GENMASK(1, 0),
98 		GPIO2D0_GPIO            = 0,
99 		GPIO2D0_UART0_SIN       = (1 << 0),
100 	};
101 
102 #if defined(CONFIG_DEBUG_UART_BASE) && (CONFIG_DEBUG_UART_BASE == 0xff180000)
103 	/* Enable early UART0 on the RK3368 */
104 	rk_clrsetreg(&grf->gpio2d_iomux,
105 		     GPIO2D0_MASK, GPIO2D0_UART0_SIN);
106 	rk_clrsetreg(&grf->gpio2d_iomux,
107 		     GPIO2D1_MASK, GPIO2D1_UART0_SOUT);
108 #endif
109 }
110 
111 void board_init_f(ulong dummy)
112 {
113 	struct udevice *dev;
114 	int ret;
115 
116 #define EARLY_UART
117 #ifdef EARLY_UART
118 	/*
119 	 * Debug UART can be used from here if required:
120 	 *
121 	 * debug_uart_init();
122 	 * printch('a');
123 	 * printhex8(0x1234);
124 	 * printascii("string");
125 	 */
126 	debug_uart_init();
127 	printascii("U-Boot TPL board init\n");
128 #endif
129 
130 	ret = spl_early_init();
131 	if (ret) {
132 		debug("spl_early_init() failed: %d\n", ret);
133 		hang();
134 	}
135 
136 	/* Reset security, so we can use DMA in the MMC drivers */
137 	sgrf_init();
138 
139 	ret = uclass_get_device(UCLASS_RAM, 0, &dev);
140 	if (ret) {
141 		debug("DRAM init failed: %d\n", ret);
142 		return;
143 	}
144 }
145 
146 void board_return_to_bootrom(void)
147 {
148 	back_to_bootrom(BROM_BOOT_NEXTSTAGE);
149 }
150 
151 u32 spl_boot_device(void)
152 {
153 	return BOOT_DEVICE_BOOTROM;
154 }
155