drivers/spi/spi.c

   1 /*
   2  * Copyright (c) 2011 The Chromium OS Authors.
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 #include <common.h>
   8 #include <fdtdec.h>
   9 #include <malloc.h>
  10 #include <spi.h>
  11
  12 int spi_set_wordlen(struct spi_slave *slave, unsigned int wordlen)
  13 {
  14         if (wordlen == 0 || wordlen > 32) {
  15                 printf("spi: invalid wordlen %d\n", wordlen);
  16                 return -1;
  17         }
  18
  19         slave->wordlen = wordlen;
  20
  21         return 0;
  22 }
  23
  24 void *spi_do_alloc_slave(int offset, int size, unsigned int bus,
  25                          unsigned int cs)
  26 {
  27         struct spi_slave *slave;
  28         void *ptr;
  29
  30         ptr = malloc(size);
  31         if (ptr) {
  32                 memset(ptr, '\0', size);
  33                 slave = (struct spi_slave *)(ptr + offset);
  34                 slave->bus = bus;
  35                 slave->cs = cs;
  36                 slave->wordlen = SPI_DEFAULT_WORDLEN;
  37         }
  38
  39         return ptr;
  40 }
  41
  42 #ifdef CONFIG_OF_SPI
  43 struct spi_slave *spi_base_setup_slave_fdt(const void *blob, int busnum,
  44                                            int node)
  45 {
  46         int cs, max_hz, mode = 0;
  47
  48         cs = fdtdec_get_int(blob, node, "reg", -1);
  49         max_hz = fdtdec_get_int(blob, node, "spi-max-frequency", 100000);
  50         if (fdtdec_get_bool(blob, node, "spi-cpol"))
  51                 mode |= SPI_CPOL;
  52         if (fdtdec_get_bool(blob, node, "spi-cpha"))
  53                 mode |= SPI_CPHA;
  54         if (fdtdec_get_bool(blob, node, "spi-cs-high"))
  55                 mode |= SPI_CS_HIGH;
  56         if (fdtdec_get_bool(blob, node, "spi-half-duplex"))
  57                 mode |= SPI_PREAMBLE;
  58         return spi_setup_slave(busnum, cs, max_hz, mode);
  59 }
  60 #endif