1 /*
2  * sys_info.c
3  *
4  * System information functions
5  *
6  * Copyright (C) 2011, Texas Instruments, Incorporated - http://www.ti.com/
7  *
8  * Derived from Beagle Board and 3430 SDP code by
9  *      Richard Woodruff <r-woodruff2@ti.com>
10  *      Syed Mohammed Khasim <khasim@ti.com>
11  *
12  * SPDX-License-Identifier:	GPL-2.0+
13  */
14 
15 #include <common.h>
16 #include <asm/io.h>
17 #include <asm/arch/sys_proto.h>
18 #include <asm/arch/cpu.h>
19 #include <asm/arch/clock.h>
20 #include <power/tps65910.h>
21 #include <linux/compiler.h>
22 
23 struct ctrl_stat *cstat = (struct ctrl_stat *)CTRL_BASE;
24 
25 /**
26  * get_cpu_rev(void) - extract rev info
27  */
28 u32 get_cpu_rev(void)
29 {
30 	u32 id;
31 	u32 rev;
32 
33 	id = readl(DEVICE_ID);
34 	rev = (id >> 28) & 0xff;
35 
36 	return rev;
37 }
38 
39 /**
40  * get_cpu_type(void) - extract cpu info
41  */
42 u32 get_cpu_type(void)
43 {
44 	u32 id = 0;
45 	u32 partnum;
46 
47 	id = readl(DEVICE_ID);
48 	partnum = (id >> 12) & 0xffff;
49 
50 	return partnum;
51 }
52 
53 /**
54  * get_sysboot_value(void) - return SYS_BOOT[4:0]
55  */
56 u32 get_sysboot_value(void)
57 {
58 	return readl(&cstat->statusreg) & SYSBOOT_MASK;
59 }
60 
61 u32 get_sys_clk_index(void)
62 {
63 	struct ctrl_stat *ctrl = (struct ctrl_stat *)CTRL_BASE;
64 	u32 ind = readl(&ctrl->statusreg);
65 
66 #ifdef CONFIG_AM43XX
67 	u32 src;
68 	src = (ind & CTRL_CRYSTAL_FREQ_SRC_MASK) >> CTRL_CRYSTAL_FREQ_SRC_SHIFT;
69 	if (src == CTRL_CRYSTAL_FREQ_SRC_EFUSE) /* Value read from EFUSE */
70 		return ((ind & CTRL_CRYSTAL_FREQ_SELECTION_MASK) >>
71 			CTRL_CRYSTAL_FREQ_SELECTION_SHIFT);
72 	else /* Value read from SYS BOOT pins */
73 #endif
74 		return ((ind & CTRL_SYSBOOT_15_14_MASK) >>
75 			CTRL_SYSBOOT_15_14_SHIFT);
76 }
77 
78 
79 #ifdef CONFIG_DISPLAY_CPUINFO
80 static char *cpu_revs[] = {
81 		"1.0",
82 		"2.0",
83 		"2.1"};
84 
85 static char *cpu_revs_am43xx[] = {
86 		"1.0",
87 		"1.1",
88 		"1.2"};
89 
90 static char *dev_types[] = {
91 		"TST",
92 		"EMU",
93 		"HS",
94 		"GP"};
95 
96 /**
97  * Print CPU information
98  */
99 int print_cpuinfo(void)
100 {
101 	char *cpu_s, *sec_s, *rev_s;
102 	char **cpu_rev_arr = cpu_revs;
103 
104 	switch (get_cpu_type()) {
105 	case AM335X:
106 		cpu_s = "AM335X";
107 		break;
108 	case TI81XX:
109 		cpu_s = "TI81XX";
110 		break;
111 	case AM437X:
112 		cpu_s = "AM437X";
113 		cpu_rev_arr = cpu_revs_am43xx;
114 		break;
115 	default:
116 		cpu_s = "Unknown CPU type";
117 		break;
118 	}
119 
120 	if (get_cpu_rev() < ARRAY_SIZE(cpu_revs))
121 		rev_s = cpu_rev_arr[get_cpu_rev()];
122 	else
123 		rev_s = "?";
124 
125 	if (get_device_type() < ARRAY_SIZE(dev_types))
126 		sec_s = dev_types[get_device_type()];
127 	else
128 		sec_s = "?";
129 
130 	printf("CPU  : %s-%s rev %s\n", cpu_s, sec_s, rev_s);
131 
132 	return 0;
133 }
134 #endif	/* CONFIG_DISPLAY_CPUINFO */
135 
136 #ifdef CONFIG_AM33XX
137 int am335x_get_efuse_mpu_max_freq(struct ctrl_dev *cdev)
138 {
139 	int sil_rev;
140 
141 	sil_rev = readl(&cdev->deviceid) >> 28;
142 
143 	if (sil_rev == 0) {
144 		/* No efuse in PG 1.0. Use max speed */
145 		return MPUPLL_M_720;
146 	} else if (sil_rev >= 1) {
147 		/* Check what the efuse says our max speed is. */
148 		int efuse_arm_mpu_max_freq, package_type;
149 		efuse_arm_mpu_max_freq = readl(&cdev->efuse_sma);
150 		package_type = (efuse_arm_mpu_max_freq & PACKAGE_TYPE_MASK) >>
151 				PACKAGE_TYPE_SHIFT;
152 
153 		/* PG 2.0, efuse may not be set. */
154 		if (package_type == PACKAGE_TYPE_UNDEFINED || package_type ==
155 		    PACKAGE_TYPE_RESERVED)
156 			return MPUPLL_M_800;
157 
158 		switch ((efuse_arm_mpu_max_freq & DEVICE_ID_MASK)) {
159 		case AM335X_ZCZ_1000:
160 			return MPUPLL_M_1000;
161 		case AM335X_ZCZ_800:
162 			return MPUPLL_M_800;
163 		case AM335X_ZCZ_720:
164 			return MPUPLL_M_720;
165 		case AM335X_ZCZ_600:
166 		case AM335X_ZCE_600:
167 			return MPUPLL_M_600;
168 		case AM335X_ZCZ_300:
169 		case AM335X_ZCE_300:
170 			return MPUPLL_M_300;
171 		}
172 	}
173 
174 	/* unknown, use the PG1.0 max */
175 	return MPUPLL_M_720;
176 }
177 
178 int am335x_get_tps65910_mpu_vdd(int sil_rev, int frequency)
179 {
180 	/* For PG2.0 and later, we have one set of values. */
181 	if (sil_rev >= 1) {
182 		switch (frequency) {
183 		case MPUPLL_M_1000:
184 			return TPS65910_OP_REG_SEL_1_3_2_5;
185 		case MPUPLL_M_800:
186 			return TPS65910_OP_REG_SEL_1_2_6;
187 		case MPUPLL_M_720:
188 			return TPS65910_OP_REG_SEL_1_2_0;
189 		case MPUPLL_M_600:
190 		case MPUPLL_M_500:
191 		case MPUPLL_M_300:
192 			return TPS65910_OP_REG_SEL_1_1_0;
193 		}
194 	}
195 
196 	/* Default to PG1.0 values. */
197 	return TPS65910_OP_REG_SEL_1_2_6;
198 }
199 #endif
200