src/mainboard/dell/optiplex_9020/sch5555_ec.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <arch/io.h>
   4 #include <device/pnp_ops.h>
   5 #include <superio/smsc/sch555x/sch555x.h>
   6 #include "sch5555_ec.h"
   7
   8 uint8_t sch5555_mbox_read(uint8_t addr1, uint16_t addr2)
   9 {
  10         // clear ec-to-host mailbox
  11         uint8_t tmp = inb(SCH555x_EMI_IOBASE + 1);
  12         outb(tmp, SCH555x_EMI_IOBASE + 1);
  13
  14         // send address
  15         outw(0 | 0x8001, SCH555x_EMI_IOBASE + 2);
  16         outw((addr1 * 2) | 0x100, SCH555x_EMI_IOBASE + 4);
  17
  18         outw(4 | 0x8002, SCH555x_EMI_IOBASE + 2);
  19         outl(addr2 << 16, SCH555x_EMI_IOBASE + 4);
  20
  21         // send message to ec
  22         outb(1, SCH555x_EMI_IOBASE);
  23
  24         // wait for ack
  25         for (size_t retry = 0; retry < 0xfff; ++retry)
  26                 if (inb(SCH555x_EMI_IOBASE + 1) & 1)
  27                         break;
  28
  29         // read result
  30         outw(4 | 0x8000, SCH555x_EMI_IOBASE + 2);
  31         return inb(SCH555x_EMI_IOBASE + 4);
  32 }
  33
  34 void sch5555_mbox_write(uint8_t addr1, uint16_t addr2, uint8_t val)
  35 {
  36         // clear ec-to-host mailbox
  37         uint8_t tmp = inb(SCH555x_EMI_IOBASE + 1);
  38         outb(tmp, SCH555x_EMI_IOBASE + 1);
  39
  40         // send address and value
  41         outw(0 | 0x8001, SCH555x_EMI_IOBASE + 2);
  42         outw((addr1 * 2) | 0x101, SCH555x_EMI_IOBASE + 4);
  43
  44         outw(4 | 0x8002, SCH555x_EMI_IOBASE + 2);
  45         outl(val | (addr2 << 16), SCH555x_EMI_IOBASE + 4);
  46
  47         // send message to ec
  48         outb(1, SCH555x_EMI_IOBASE);
  49
  50         // wait for ack
  51         for (size_t retry = 0; retry < 0xfff; ++retry)
  52                 if (inb(SCH555x_EMI_IOBASE + 1) & 1)
  53                         break;
  54 }