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1 /*
2  * (C) Copyright 2002
3  * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com
4  *
5  * SPDX-License-Identifier:     GPL-2.0+
6  */
7
8 /*
9  * SPI Read/Write Utilities
10  */
11
12 #include <common.h>
13 #include <command.h>
14 #include <dm.h>
15 #include <errno.h>
16 #include <spi.h>
17
18 /*-----------------------------------------------------------------------
19  * Definitions
20  */
21
22 #ifndef MAX_SPI_BYTES
23 #   define MAX_SPI_BYTES 32     /* Maximum number of bytes we can handle */
24 #endif
25
26 #ifndef CONFIG_DEFAULT_SPI_BUS
27 #   define CONFIG_DEFAULT_SPI_BUS       0
28 #endif
29 #ifndef CONFIG_DEFAULT_SPI_MODE
30 #   define CONFIG_DEFAULT_SPI_MODE      SPI_MODE_0
31 #endif
32
33 /*
34  * Values from last command.
35  */
36 static unsigned int     bus;
37 static unsigned int     cs;
38 static unsigned int     mode;
39 static int              bitlen;
40 static uchar            dout[MAX_SPI_BYTES];
41 static uchar            din[MAX_SPI_BYTES];
42
43 static int do_spi_xfer(int bus, int cs)
44 {
45         struct spi_slave *slave;
46         int ret = 0;
47
48 #ifdef CONFIG_DM_SPI
49         char name[30], *str;
50         struct udevice *dev;
51
52         snprintf(name, sizeof(name), "generic_%d:%d", bus, cs);
53         str = strdup(name);
54         if (!str)
55                 return -ENOMEM;
56         ret = spi_get_bus_and_cs(bus, cs, 1000000, mode, "spi_generic_drv",
57                                  str, &dev, &slave);
58         if (ret)
59                 return ret;
60 #else
61         slave = spi_setup_slave(bus, cs, 1000000, mode);
62         if (!slave) {
63                 printf("Invalid device %d:%d\n", bus, cs);
64                 return -EINVAL;
65         }
66 #endif
67
68         ret = spi_claim_bus(slave);
69         if (ret)
70                 goto done;
71         ret = spi_xfer(slave, bitlen, dout, din,
72                        SPI_XFER_BEGIN | SPI_XFER_END);
73 #ifndef CONFIG_DM_SPI
74         /* We don't get an error code in this case */
75         if (ret)
76                 ret = -EIO;
77 #endif
78         if (ret) {
79                 printf("Error %d during SPI transaction\n", ret);
80         } else {
81                 int j;
82
83                 for (j = 0; j < ((bitlen + 7) / 8); j++)
84                         printf("%02X", din[j]);
85                 printf("\n");
86         }
87 done:
88         spi_release_bus(slave);
89 #ifndef CONFIG_DM_SPI
90         spi_free_slave(slave);
91 #endif
92
93         return ret;
94 }
95
96 /*
97  * SPI read/write
98  *
99  * Syntax:
100  *   spi {dev} {num_bits} {dout}
101  *     {dev} is the device number for controlling chip select (see TBD)
102  *     {num_bits} is the number of bits to send & receive (base 10)
103  *     {dout} is a hexadecimal string of data to send
104  * The command prints out the hexadecimal string received via SPI.
105  */
106
107 int do_spi (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
108 {
109         char  *cp = 0;
110         uchar tmp;
111         int   j;
112
113         /*
114          * We use the last specified parameters, unless new ones are
115          * entered.
116          */
117
118         if ((flag & CMD_FLAG_REPEAT) == 0)
119         {
120                 if (argc >= 2) {
121                         mode = CONFIG_DEFAULT_SPI_MODE;
122                         bus = simple_strtoul(argv[1], &cp, 10);
123                         if (*cp == ':') {
124                                 cs = simple_strtoul(cp+1, &cp, 10);
125                         } else {
126                                 cs = bus;
127                                 bus = CONFIG_DEFAULT_SPI_BUS;
128                         }
129                         if (*cp == '.')
130                                 mode = simple_strtoul(cp+1, NULL, 10);
131                 }
132                 if (argc >= 3)
133                         bitlen = simple_strtoul(argv[2], NULL, 10);
134                 if (argc >= 4) {
135                         cp = argv[3];
136                         for(j = 0; *cp; j++, cp++) {
137                                 tmp = *cp - '0';
138                                 if(tmp > 9)
139                                         tmp -= ('A' - '0') - 10;
140                                 if(tmp > 15)
141                                         tmp -= ('a' - 'A');
142                                 if(tmp > 15) {
143                                         printf("Hex conversion error on %c\n", *cp);
144                                         return 1;
145                                 }
146                                 if((j % 2) == 0)
147                                         dout[j / 2] = (tmp << 4);
148                                 else
149                                         dout[j / 2] |= tmp;
150                         }
151                 }
152         }
153
154         if ((bitlen < 0) || (bitlen >  (MAX_SPI_BYTES * 8))) {
155                 printf("Invalid bitlen %d\n", bitlen);
156                 return 1;
157         }
158
159         if (do_spi_xfer(bus, cs))
160                 return 1;
161
162         return 0;
163 }
164
165 /***************************************************/
166
167 U_BOOT_CMD(
168         sspi,   5,      1,      do_spi,
169         "SPI utility command",
170         "[<bus>:]<cs>[.<mode>] <bit_len> <dout> - Send and receive bits\n"
171         "<bus>     - Identifies the SPI bus\n"
172         "<cs>      - Identifies the chip select\n"
173         "<mode>    - Identifies the SPI mode to use\n"
174         "<bit_len> - Number of bits to send (base 10)\n"
175         "<dout>    - Hexadecimal string that gets sent"
176 );