2 * Stout board CPLD access support
4 * Copyright (C) 2015 Renesas Electronics Europe GmbH
5 * Copyright (C) 2015 Renesas Electronics Corporation
6 * Copyright (C) 2015 Cogent Embedded, Inc.
8 * SPDX-License-Identifier: GPL-2.0
16 #define SCLK GPIO_GP_3_24
17 #define SSTBZ GPIO_GP_3_25
18 #define MOSI GPIO_GP_3_26
19 #define MISO GPIO_GP_3_27
21 #define CPLD_ADDR_MODE 0x00 /* RW */
22 #define CPLD_ADDR_MUX 0x01 /* RW */
23 #define CPLD_ADDR_HDMI 0x02 /* RW */
24 #define CPLD_ADDR_DIPSW 0x08 /* R */
25 #define CPLD_ADDR_RESET 0x80 /* RW */
26 #define CPLD_ADDR_VERSION 0xFF /* R */
28 static u32 cpld_read(u8 addr)
33 for (i = 0; i < 8; i++) {
34 gpio_set_value(MOSI, addr & 0x80); /* MSB first */
35 gpio_set_value(SCLK, 1);
37 gpio_set_value(SCLK, 0);
40 gpio_set_value(MOSI, 0); /* READ */
41 gpio_set_value(SSTBZ, 0);
42 gpio_set_value(SCLK, 1);
43 gpio_set_value(SCLK, 0);
44 gpio_set_value(SSTBZ, 1);
46 for (i = 0; i < 32; i++) {
47 gpio_set_value(SCLK, 1);
49 data |= gpio_get_value(MISO); /* MSB first */
50 gpio_set_value(SCLK, 0);
56 static void cpld_write(u8 addr, u32 data)
60 for (i = 0; i < 32; i++) {
61 gpio_set_value(MOSI, data & (1 << 31)); /* MSB first */
62 gpio_set_value(SCLK, 1);
64 gpio_set_value(SCLK, 0);
67 for (i = 0; i < 8; i++) {
68 gpio_set_value(MOSI, addr & 0x80); /* MSB first */
69 gpio_set_value(SCLK, 1);
71 gpio_set_value(SCLK, 0);
74 gpio_set_value(MOSI, 1); /* WRITE */
75 gpio_set_value(SSTBZ, 0);
76 gpio_set_value(SCLK, 1);
77 gpio_set_value(SCLK, 0);
78 gpio_set_value(SSTBZ, 1);
81 /* LSI pin pull-up control */
82 #define PUPR3 0xe606010C
83 #define PUPR3_SD3_DAT1 (1 << 27)
89 /* PULL-UP on MISO line */
91 val |= PUPR3_SD3_DAT1;
94 gpio_request(SCLK, NULL);
95 gpio_request(SSTBZ, NULL);
96 gpio_request(MOSI, NULL);
97 gpio_request(MISO, NULL);
99 gpio_direction_output(SCLK, 0);
100 gpio_direction_output(SSTBZ, 1);
101 gpio_direction_output(MOSI, 0);
102 gpio_direction_input(MISO);
105 cpld_read(CPLD_ADDR_VERSION);
107 printf("CPLD version: 0x%08x\n",
108 cpld_read(CPLD_ADDR_VERSION));
109 printf("H2 Mode setting (MD0..28): 0x%08x\n",
110 cpld_read(CPLD_ADDR_MODE));
111 printf("Multiplexer settings: 0x%08x\n",
112 cpld_read(CPLD_ADDR_MUX));
113 printf("HDMI setting: 0x%08x\n",
114 cpld_read(CPLD_ADDR_HDMI));
115 printf("DIPSW (SW3): 0x%08x\n",
116 cpld_read(CPLD_ADDR_DIPSW));
118 #ifdef CONFIG_SH_SDHI
119 /* switch MUX to SD0 */
120 val = cpld_read(CPLD_ADDR_MUX);
123 cpld_write(CPLD_ADDR_MUX, val);
127 static int do_cpld(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
132 return CMD_RET_USAGE;
134 addr = simple_strtoul(argv[2], NULL, 16);
135 if (!(addr == CPLD_ADDR_VERSION || addr == CPLD_ADDR_MODE ||
136 addr == CPLD_ADDR_MUX || addr == CPLD_ADDR_HDMI ||
137 addr == CPLD_ADDR_DIPSW || addr == CPLD_ADDR_RESET)) {
138 printf("cpld invalid addr\n");
139 return CMD_RET_USAGE;
142 if (argc == 3 && strcmp(argv[1], "read") == 0) {
143 printf("0x%x\n", cpld_read(addr));
144 } else if (argc == 4 && strcmp(argv[1], "write") == 0) {
145 val = simple_strtoul(argv[3], NULL, 16);
146 if (addr == CPLD_ADDR_MUX) {
147 /* never mask SCIFA0 console */
148 val &= ~MUX_MSK_SCIFA0_USB;
149 val |= MUX_VAL_SCIFA0_USB;
151 cpld_write(addr, val);
161 "cpld write addr val\n"
164 void reset_cpu(ulong addr)
166 cpld_write(CPLD_ADDR_RESET, 1);