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1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * (C) Copyright 2002
4  * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com
5  */
6
7 /*
8  * SPI Read/Write Utilities
9  */
10
11 #include <common.h>
12 #include <command.h>
13 #include <dm.h>
14 #include <errno.h>
15 #include <spi.h>
16
17 /*-----------------------------------------------------------------------
18  * Definitions
19  */
20
21 #ifndef MAX_SPI_BYTES
22 #   define MAX_SPI_BYTES 32     /* Maximum number of bytes we can handle */
23 #endif
24
25 #ifndef CONFIG_DEFAULT_SPI_BUS
26 #   define CONFIG_DEFAULT_SPI_BUS       0
27 #endif
28 #ifndef CONFIG_DEFAULT_SPI_MODE
29 #   define CONFIG_DEFAULT_SPI_MODE      SPI_MODE_0
30 #endif
31
32 /*
33  * Values from last command.
34  */
35 static unsigned int     bus;
36 static unsigned int     cs;
37 static unsigned int     mode;
38 static int              bitlen;
39 static uchar            dout[MAX_SPI_BYTES];
40 static uchar            din[MAX_SPI_BYTES];
41
42 static int do_spi_xfer(int bus, int cs)
43 {
44         struct spi_slave *slave;
45         int ret = 0;
46
47 #ifdef CONFIG_DM_SPI
48         char name[30], *str;
49         struct udevice *dev;
50
51         snprintf(name, sizeof(name), "generic_%d:%d", bus, cs);
52         str = strdup(name);
53         if (!str)
54                 return -ENOMEM;
55         ret = spi_get_bus_and_cs(bus, cs, 1000000, mode, "spi_generic_drv",
56                                  str, &dev, &slave);
57         if (ret)
58                 return ret;
59 #else
60         slave = spi_setup_slave(bus, cs, 1000000, mode);
61         if (!slave) {
62                 printf("Invalid device %d:%d\n", bus, cs);
63                 return -EINVAL;
64         }
65 #endif
66
67         ret = spi_claim_bus(slave);
68         if (ret)
69                 goto done;
70         ret = spi_xfer(slave, bitlen, dout, din,
71                        SPI_XFER_BEGIN | SPI_XFER_END);
72 #ifndef CONFIG_DM_SPI
73         /* We don't get an error code in this case */
74         if (ret)
75                 ret = -EIO;
76 #endif
77         if (ret) {
78                 printf("Error %d during SPI transaction\n", ret);
79         } else {
80                 int j;
81
82                 for (j = 0; j < ((bitlen + 7) / 8); j++)
83                         printf("%02X", din[j]);
84                 printf("\n");
85         }
86 done:
87         spi_release_bus(slave);
88 #ifndef CONFIG_DM_SPI
89         spi_free_slave(slave);
90 #endif
91
92         return ret;
93 }
94
95 /*
96  * SPI read/write
97  *
98  * Syntax:
99  *   spi {dev} {num_bits} {dout}
100  *     {dev} is the device number for controlling chip select (see TBD)
101  *     {num_bits} is the number of bits to send & receive (base 10)
102  *     {dout} is a hexadecimal string of data to send
103  * The command prints out the hexadecimal string received via SPI.
104  */
105
106 int do_spi (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
107 {
108         char  *cp = 0;
109         uchar tmp;
110         int   j;
111
112         /*
113          * We use the last specified parameters, unless new ones are
114          * entered.
115          */
116
117         if ((flag & CMD_FLAG_REPEAT) == 0)
118         {
119                 if (argc >= 2) {
120                         mode = CONFIG_DEFAULT_SPI_MODE;
121                         bus = simple_strtoul(argv[1], &cp, 10);
122                         if (*cp == ':') {
123                                 cs = simple_strtoul(cp+1, &cp, 10);
124                         } else {
125                                 cs = bus;
126                                 bus = CONFIG_DEFAULT_SPI_BUS;
127                         }
128                         if (*cp == '.')
129                                 mode = simple_strtoul(cp+1, NULL, 10);
130                 }
131                 if (argc >= 3)
132                         bitlen = simple_strtoul(argv[2], NULL, 10);
133                 if (argc >= 4) {
134                         cp = argv[3];
135                         for(j = 0; *cp; j++, cp++) {
136                                 tmp = *cp - '0';
137                                 if(tmp > 9)
138                                         tmp -= ('A' - '0') - 10;
139                                 if(tmp > 15)
140                                         tmp -= ('a' - 'A');
141                                 if(tmp > 15) {
142                                         printf("Hex conversion error on %c\n", *cp);
143                                         return 1;
144                                 }
145                                 if((j % 2) == 0)
146                                         dout[j / 2] = (tmp << 4);
147                                 else
148                                         dout[j / 2] |= tmp;
149                         }
150                 }
151         }
152
153         if ((bitlen < 0) || (bitlen >  (MAX_SPI_BYTES * 8))) {
154                 printf("Invalid bitlen %d\n", bitlen);
155                 return 1;
156         }
157
158         if (do_spi_xfer(bus, cs))
159                 return 1;
160
161         return 0;
162 }
163
164 /***************************************************/
165
166 U_BOOT_CMD(
167         sspi,   5,      1,      do_spi,
168         "SPI utility command",
169         "[<bus>:]<cs>[.<mode>] <bit_len> <dout> - Send and receive bits\n"
170         "<bus>     - Identifies the SPI bus\n"
171         "<cs>      - Identifies the chip select\n"
172         "<mode>    - Identifies the SPI mode to use\n"
173         "<bit_len> - Number of bits to send (base 10)\n"
174         "<dout>    - Hexadecimal string that gets sent"
175 );