src/mainboard/prodrive/atlas/ec.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #define __SIMPLE_DEVICE__
   4
   5 #include <arch/io.h>
   6 #include <device/pnp.h>
   7 #include <device/pnp_ops.h>
   8 #include <types.h>
   9
  10 #include "ec.h"
  11
  12 /* 10.7.2 ENABLE CONFIG MODE */
  13 static void pnp_enter_conf_state(const pnp_devfn_t dev)
  14 {
  15         const u16 port = dev >> 8;
  16         outb(0x55, port);
  17 }
  18
  19 /* 10.7.3 DISABLE CONFIG MODE */
  20 static void pnp_exit_conf_state(const pnp_devfn_t dev)
  21 {
  22         const u16 port = dev >> 8;
  23         outb(0xaa, port);
  24 }
  25
  26 void ec_espi_io_program_iobase(const u16 port, const u8 iobase_index, const u16 base)
  27 {
  28         const pnp_devfn_t dev = PNP_DEV(port, LDN_ESPI_IO_COMPONENT);
  29
  30         pnp_enter_conf_state(dev);
  31         pnp_set_logical_device(dev);
  32         pnp_write_config(dev, iobase_index + 2, (base & 0x00ff) >> 0);  /* Addr LSB */
  33         pnp_write_config(dev, iobase_index + 3, (base & 0xff00) >> 8);  /* Addr MSB */
  34         pnp_write_config(dev, iobase_index + 0, base != 0x0000);        /* Valid bit */
  35         pnp_exit_conf_state(dev);
  36 }
  37
  38 /* TABLE 14-5: RUNTIME REGISTER SUMMARY */
  39 #define HOST_EC_MBOX            0x00
  40 #define EC_HOST_MBOX            0x01
  41 #define EC_ADDRESS_LSB          0x02
  42 #define EC_ADDRESS_MSB          0x03
  43 #define EC_DATA_BYTE(n)         (0x04 + (n) % sizeof(u32))
  44 #define INTERRUPT_SOURCE_LSB    0x08
  45 #define INTERRUPT_SOURCE_MSB    0x09
  46 #define INTERRUPT_MASK_LSB      0x0a
  47 #define INTERRUPT_MASK_MSB      0x0b
  48 #define APPLICATION_ID          0x0c
  49
  50 /* 14.8.3 ACCESS TYPES */
  51 enum emi_access_type {
  52         EMI_ACCESS_8_BIT                = 0,
  53         EMI_ACCESS_16_BIT               = 1,
  54         EMI_ACCESS_32_BIT               = 2,
  55         EMI_ACCESS_32_BIT_AUTO_INC      = 3,
  56 };
  57
  58 void ec_emi_read(u8 *dest, const u16 base, const u8 region, const u16 offset, const u16 length)
  59 {
  60         const u16 addr = ((region & 1) << 15) | (offset & 0x7ffc) | EMI_ACCESS_32_BIT_AUTO_INC;
  61
  62         outb((addr & 0x00ff) >> 0, base + EC_ADDRESS_LSB);
  63         outb((addr & 0xff00) >> 8, base + EC_ADDRESS_MSB);
  64
  65         /* EC_ADDRESS auto-increment happens when accessing EC_DATA_BYTE_3 */
  66         for (u16 i = 0; i < length; i++)
  67                 dest[i] = inb(base + EC_DATA_BYTE(offset + i));
  68 }