arch/arm/cpu/armv8/zynqmp/slcr.c

   1 /*
   2  * (C) Copyright 2014 - 2015 Xilinx, Inc.
   3  * Michal Simek <michal.simek@xilinx.com>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <asm/io.h>
  10 #include <malloc.h>
  11 #include <asm/arch/hardware.h>
  12 #include <asm/arch/sys_proto.h>
  13 #include <asm/arch/clk.h>
  14
  15 /*
  16  * zynq_slcr_mio_get_status - Get the status of MIO peripheral.
  17  *
  18  * @peri_name: Name of the peripheral for checking MIO status
  19  * @get_pins: Pointer to array of get pin for this peripheral
  20  * @num_pins: Number of pins for this peripheral
  21  * @mask: Mask value
  22  * @check_val: Required check value to get the status of  periph
  23  */
  24 struct zynq_slcr_mio_get_status {
  25         const char *peri_name;
  26         const int *get_pins;
  27         int num_pins;
  28         u32 mask;
  29         u32 check_val;
  30 };
  31
  32 static const struct zynq_slcr_mio_get_status mio_periphs[] = {
  33 };
  34
  35 /*
  36  * zynq_slcr_get_mio_pin_status - Get the MIO pin status of peripheral.
  37  *
  38  * @periph: Name of the peripheral
  39  *
  40  * Returns count to indicate the number of pins configured for the
  41  * given @periph.
  42  */
  43 int zynq_slcr_get_mio_pin_status(const char *periph)
  44 {
  45         const struct zynq_slcr_mio_get_status *mio_ptr;
  46         int val, i, j;
  47         int mio = 0;
  48
  49         for (i = 0; i < ARRAY_SIZE(mio_periphs); i++) {
  50                 if (strcmp(periph, mio_periphs[i].peri_name) == 0) {
  51                         mio_ptr = &mio_periphs[i];
  52                         for (j = 0; j < mio_ptr->num_pins; j++) {
  53                                 val = readl(&slcr_base->mio_pin
  54                                                 [mio_ptr->get_pins[j]]);
  55                                 if ((val & mio_ptr->mask) == mio_ptr->check_val)
  56                                         mio++;
  57                         }
  58                         break;
  59                 }
  60         }
  61
  62         return mio;
  63 }