src/southbridge/intel/ibexpeak/smbus.c

   1 /*
   2  * This file is part of the coreboot project.
   3  *
   4  * Copyright (C) 2008-2009 coresystems GmbH
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License as
   8  * published by the Free Software Foundation; version 2 of
   9  * the License.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  */
  16
  17 #include <console/console.h>
  18 #include <device/device.h>
  19 #include <device/path.h>
  20 #include <device/smbus.h>
  21 #include <device/pci.h>
  22 #include <device/pci_ids.h>
  23 #include <device/pci_ops.h>
  24 #include <arch/io.h>
  25 #include "pch.h"
  26 #include "smbus.h"
  27
  28 static void pch_smbus_init(device_t dev)
  29 {
  30         struct resource *res;
  31         u16 reg16;
  32
  33         /* Enable clock gating */
  34         reg16 = pci_read_config32(dev, 0x80);
  35         reg16 &= ~((1 << 8)|(1 << 10)|(1 << 12)|(1 << 14));
  36         pci_write_config32(dev, 0x80, reg16);
  37
  38         /* Set Receive Slave Address */
  39         res = find_resource(dev, PCI_BASE_ADDRESS_4);
  40         if (res)
  41                 outb(SMBUS_SLAVE_ADDR, res->base + SMB_RCV_SLVA);
  42 }
  43
  44 static int lsmbus_read_byte(device_t dev, u8 address)
  45 {
  46         u16 device;
  47         struct resource *res;
  48         struct bus *pbus;
  49
  50         device = dev->path.i2c.device;
  51         pbus = get_pbus_smbus(dev);
  52         res = find_resource(pbus->dev, 0x20);
  53
  54         return do_smbus_read_byte(res->base, device, address);
  55 }
  56
  57 static int lsmbus_write_byte(device_t dev, u8 address, u8 val)
  58 {
  59         u16 device;
  60         struct resource *res;
  61         struct bus *pbus;
  62
  63         device = dev->path.i2c.device;
  64         pbus = get_pbus_smbus(dev);
  65         res = find_resource(pbus->dev, 0x20);
  66
  67         return do_smbus_write_byte(res->base, device, address, val);
  68 }
  69
  70 static struct smbus_bus_operations lops_smbus_bus = {
  71         .read_byte      = lsmbus_read_byte,
  72         .write_byte     = lsmbus_write_byte,
  73 };
  74
  75 static void smbus_set_subsystem(device_t dev, unsigned vendor, unsigned device)
  76 {
  77         if (!vendor || !device) {
  78                 pci_write_config32(dev, PCI_SUBSYSTEM_VENDOR_ID,
  79                                 pci_read_config32(dev, PCI_VENDOR_ID));
  80         } else {
  81                 pci_write_config32(dev, PCI_SUBSYSTEM_VENDOR_ID,
  82                                 ((device & 0xffff) << 16) | (vendor & 0xffff));
  83         }
  84 }
  85
  86 static struct pci_operations smbus_pci_ops = {
  87         .set_subsystem    = smbus_set_subsystem,
  88 };
  89
  90 static void smbus_read_resources(device_t dev)
  91 {
  92         struct resource *res = new_resource(dev, PCI_BASE_ADDRESS_4);
  93         res->base = SMBUS_IO_BASE;
  94         res->size = 32;
  95         res->limit = res->base + res->size - 1;
  96         res->flags = IORESOURCE_IO | IORESOURCE_FIXED | IORESOURCE_RESERVE |
  97                      IORESOURCE_STORED | IORESOURCE_ASSIGNED;
  98
  99         /* Also add MMIO resource */
 100         res = pci_get_resource(dev, PCI_BASE_ADDRESS_0);
 101 }
 102
 103 static struct device_operations smbus_ops = {
 104         .read_resources         = smbus_read_resources,
 105         .set_resources          = pci_dev_set_resources,
 106         .enable_resources       = pci_dev_enable_resources,
 107         .scan_bus               = scan_smbus,
 108         .init                   = pch_smbus_init,
 109         .ops_smbus_bus          = &lops_smbus_bus,
 110         .ops_pci                = &smbus_pci_ops,
 111 };
 112
 113 static const unsigned short pci_device_ids[] = { 0x1c22, 0x1e22, 0x3b30, 0 };
 114
 115 static const struct pci_driver pch_smbus __pci_driver = {
 116         .ops     = &smbus_ops,
 117         .vendor  = PCI_VENDOR_ID_INTEL,
 118         .devices = pci_device_ids,
 119 };