1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Board init file for Dragonboard 820C
4  *
5  * (C) Copyright 2017 Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@linaro.org>
6  */
7 
8 #include <asm/arch/sysmap-apq8096.h>
9 #include <linux/arm-smccc.h>
10 #include <linux/psci.h>
11 #include <common.h>
12 #include <dm.h>
13 #include <asm/io.h>
14 #include <linux/bitops.h>
15 #include <asm/psci.h>
16 #include <asm/gpio.h>
17 
18 DECLARE_GLOBAL_DATA_PTR;
19 
dram_init(void)20 int dram_init(void)
21 {
22 	gd->ram_size = PHYS_SDRAM_SIZE;
23 
24 	return 0;
25 }
26 
dram_init_banksize(void)27 int dram_init_banksize(void)
28 {
29 	gd->bd->bi_dram[0].start = PHYS_SDRAM_1;
30 	gd->bd->bi_dram[0].size = PHYS_SDRAM_1_SIZE;
31 
32 	gd->bd->bi_dram[1].start = PHYS_SDRAM_2;
33 	gd->bd->bi_dram[1].size  = PHYS_SDRAM_2_SIZE;
34 
35 	return 0;
36 }
37 
sdhci_power_init(void)38 static void sdhci_power_init(void)
39 {
40 	const u32 TLMM_PULL_MASK = 0x3;
41 	const u32 TLMM_HDRV_MASK = 0x7;
42 
43 	struct tlmm_cfg {
44 		u32 bit;  /* bit in the register      */
45 		u8 mask;  /* mask clk/dat/cmd control */
46 		u8 val;
47 	};
48 
49 	/* bit offsets in the sdc tlmm register */
50 	enum {  SDC1_DATA_HDRV = 0,
51 		SDC1_CMD_HDRV  = 3,
52 		SDC1_CLK_HDRV  = 6,
53 		SDC1_DATA_PULL = 9,
54 		SDC1_CMD_PULL  = 11,
55 		SDC1_CLK_PULL  = 13,
56 		SDC1_RCLK_PULL = 15,
57 	};
58 
59 	enum {  TLMM_PULL_DOWN	 = 0x1,
60 		TLMM_PULL_UP   = 0x3,
61 		TLMM_NO_PULL   = 0x0,
62 	};
63 
64 	enum {  TLMM_CUR_VAL_10MA = 0x04,
65 		TLMM_CUR_VAL_16MA = 0x07,
66 	};
67 	int i;
68 
69 	/* drive strength configs for sdhc pins */
70 	const struct tlmm_cfg hdrv[] = {
71 
72 		{ SDC1_CLK_HDRV,  TLMM_CUR_VAL_16MA, TLMM_HDRV_MASK, },
73 		{ SDC1_CMD_HDRV,  TLMM_CUR_VAL_10MA, TLMM_HDRV_MASK, },
74 		{ SDC1_DATA_HDRV, TLMM_CUR_VAL_10MA, TLMM_HDRV_MASK, },
75 	};
76 
77 	/* pull configs for sdhc pins */
78 	const struct tlmm_cfg pull[] = {
79 
80 		{ SDC1_CLK_PULL,  TLMM_NO_PULL, TLMM_PULL_MASK, },
81 		{ SDC1_CMD_PULL,  TLMM_PULL_UP, TLMM_PULL_MASK, },
82 		{ SDC1_DATA_PULL, TLMM_PULL_UP, TLMM_PULL_MASK, },
83 	};
84 
85 	const struct tlmm_cfg rclk[] = {
86 
87 		{ SDC1_RCLK_PULL, TLMM_PULL_DOWN, TLMM_PULL_MASK,},
88 	};
89 
90 	for (i = 0; i < ARRAY_SIZE(hdrv); i++)
91 		clrsetbits_le32(SDC1_HDRV_PULL_CTL_REG,
92 				hdrv[i].mask << hdrv[i].bit,
93 			hdrv[i].val  << hdrv[i].bit);
94 
95 	for (i = 0; i < ARRAY_SIZE(pull); i++)
96 		clrsetbits_le32(SDC1_HDRV_PULL_CTL_REG,
97 				pull[i].mask << pull[i].bit,
98 			pull[i].val  << pull[i].bit);
99 
100 	for (i = 0; i < ARRAY_SIZE(rclk); i++)
101 		clrsetbits_le32(SDC1_HDRV_PULL_CTL_REG,
102 				rclk[i].mask << rclk[i].bit,
103 			rclk[i].val  << rclk[i].bit);
104 }
105 
show_psci_version(void)106 static void show_psci_version(void)
107 {
108 	struct arm_smccc_res res;
109 
110 	arm_smccc_smc(ARM_PSCI_0_2_FN_PSCI_VERSION, 0, 0, 0, 0, 0, 0, 0, &res);
111 
112 	printf("PSCI:  v%ld.%ld\n",
113 	       PSCI_VERSION_MAJOR(res.a0),
114 		PSCI_VERSION_MINOR(res.a0));
115 }
116 
board_init(void)117 int board_init(void)
118 {
119 	sdhci_power_init();
120 	show_psci_version();
121 
122 	return 0;
123 }
124 
reset_cpu(ulong addr)125 void reset_cpu(ulong addr)
126 {
127 	psci_system_reset();
128 }
129 
130 /* Check for vol- button - if pressed - stop autoboot */
misc_init_r(void)131 int misc_init_r(void)
132 {
133 	struct udevice *pon;
134 	struct gpio_desc resin;
135 	int node, ret;
136 
137 	ret = uclass_get_device_by_name(UCLASS_GPIO, "pm8994_pon@800", &pon);
138 	if (ret < 0) {
139 		printf("Failed to find PMIC pon node. Check device tree\n");
140 		return 0;
141 	}
142 
143 	node = fdt_subnode_offset(gd->fdt_blob, dev_of_offset(pon),
144 				  "key_vol_down");
145 	if (node < 0) {
146 		printf("Failed to find key_vol_down node. Check device tree\n");
147 		return 0;
148 	}
149 
150 	if (gpio_request_by_name_nodev(offset_to_ofnode(node), "gpios", 0,
151 				       &resin, 0)) {
152 		printf("Failed to request key_vol_down button.\n");
153 		return 0;
154 	}
155 
156 	if (dm_gpio_get_value(&resin)) {
157 		env_set("bootdelay", "-1");
158 		printf("Power button pressed - dropping to console.\n");
159 	}
160 
161 	return 0;
162 }
163