drivers/raw/ifpga_rawdev/base/opae_intel_max10.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2010-2019 Intel Corporation
   3  */
   4
   5 #include "opae_intel_max10.h"
   6
   7 static struct intel_max10_device *g_max10;
   8
   9 int max10_reg_read(unsigned int reg, unsigned int *val)
  10 {
  11         if (!g_max10)
  12                 return -ENODEV;
  13
  14         return spi_transaction_read(g_max10->spi_tran_dev,
  15                         reg, 4, (unsigned char *)val);
  16 }
  17
  18 int max10_reg_write(unsigned int reg, unsigned int val)
  19 {
  20         unsigned int tmp = val;
  21
  22         if (!g_max10)
  23                 return -ENODEV;
  24
  25         return spi_transaction_write(g_max10->spi_tran_dev,
  26                         reg, 4, (unsigned char *)&tmp);
  27 }
  28
  29 struct intel_max10_device *
  30 intel_max10_device_probe(struct altera_spi_device *spi,
  31                 int chipselect)
  32 {
  33         struct intel_max10_device *dev;
  34         int ret;
  35         unsigned int val;
  36
  37         dev = opae_malloc(sizeof(*dev));
  38         if (!dev)
  39                 return NULL;
  40
  41         dev->spi_master = spi;
  42
  43         dev->spi_tran_dev = spi_transaction_init(spi, chipselect);
  44         if (!dev->spi_tran_dev) {
  45                 dev_err(dev, "%s spi tran init fail\n", __func__);
  46                 goto free_dev;
  47         }
  48
  49         /* set the max10 device firstly */
  50         g_max10 = dev;
  51
  52         /* read FPGA loading information */
  53         ret = max10_reg_read(FPGA_PAGE_INFO_OFF, &val);
  54         if (ret) {
  55                 dev_err(dev, "fail to get FPGA loading info\n");
  56                 goto spi_tran_fail;
  57         }
  58         dev_info(dev, "FPGA loaded from %s Image\n", val ? "User" : "Factory");
  59
  60         /* set PKVL Polling manually in BBS */
  61         ret = max10_reg_write(PKVL_POLLING_CTRL, 0x3);
  62         if (ret != 0) {
  63                 dev_err(dev, "%s set PKVL polling fail\n", __func__);
  64                 goto spi_tran_fail;
  65         }
  66
  67         return dev;
  68
  69 spi_tran_fail:
  70         spi_transaction_remove(dev->spi_tran_dev);
  71 free_dev:
  72         g_max10 = NULL;
  73         opae_free(dev);
  74
  75         return NULL;
  76 }
  77
  78 int intel_max10_device_remove(struct intel_max10_device *dev)
  79 {
  80         if (!dev)
  81                 return 0;
  82
  83         if (dev->spi_tran_dev)
  84                 spi_transaction_remove(dev->spi_tran_dev);
  85
  86         g_max10 = NULL;
  87         opae_free(dev);
  88
  89         return 0;
  90 }