src/southbridge/intel/bd82x6x/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  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  19  */
  20
  21 #include <console/console.h>
  22 #include <device/device.h>
  23 #include <device/path.h>
  24 #include <device/smbus.h>
  25 #include <device/pci.h>
  26 #include <device/pci_ids.h>
  27 #include <device/pci_ops.h>
  28 #include <arch/io.h>
  29 #include "pch.h"
  30 #include "smbus.h"
  31
  32 static void pch_smbus_init(device_t dev)
  33 {
  34         struct resource *res;
  35         u16 reg16;
  36
  37         /* Enable clock gating */
  38         reg16 = pci_read_config32(dev, 0x80);
  39         reg16 &= ~((1 << 8)|(1 << 10)|(1 << 12)|(1 << 14));
  40         pci_write_config32(dev, 0x80, reg16);
  41
  42         /* Set Receive Slave Address */
  43         res = find_resource(dev, PCI_BASE_ADDRESS_4);
  44         if (res)
  45                 outb(SMBUS_SLAVE_ADDR, res->base + SMB_RCV_SLVA);
  46 }
  47
  48 static int lsmbus_read_byte(device_t dev, u8 address)
  49 {
  50         u16 device;
  51         struct resource *res;
  52         struct bus *pbus;
  53
  54         device = dev->path.i2c.device;
  55         pbus = get_pbus_smbus(dev);
  56         res = find_resource(pbus->dev, 0x20);
  57
  58         return do_smbus_read_byte(res->base, device, address);
  59 }
  60
  61 static struct smbus_bus_operations lops_smbus_bus = {
  62         .read_byte      = lsmbus_read_byte,
  63 };
  64
  65 static void smbus_set_subsystem(device_t dev, unsigned vendor, unsigned device)
  66 {
  67         if (!vendor || !device) {
  68                 pci_write_config32(dev, PCI_SUBSYSTEM_VENDOR_ID,
  69                                 pci_read_config32(dev, PCI_VENDOR_ID));
  70         } else {
  71                 pci_write_config32(dev, PCI_SUBSYSTEM_VENDOR_ID,
  72                                 ((device & 0xffff) << 16) | (vendor & 0xffff));
  73         }
  74 }
  75
  76 static struct pci_operations smbus_pci_ops = {
  77         .set_subsystem    = smbus_set_subsystem,
  78 };
  79
  80 static void smbus_read_resources(device_t dev)
  81 {
  82         struct resource *res = new_resource(dev, PCI_BASE_ADDRESS_4);
  83         res->base = SMBUS_IO_BASE;
  84         res->size = 32;
  85         res->limit = res->base + res->size - 1;
  86         res->flags = IORESOURCE_IO | IORESOURCE_FIXED | IORESOURCE_RESERVE |
  87                      IORESOURCE_STORED | IORESOURCE_ASSIGNED;
  88
  89         /* Also add MMIO resource */
  90         res = pci_get_resource(dev, PCI_BASE_ADDRESS_0);
  91 }
  92
  93 static struct device_operations smbus_ops = {
  94         .read_resources         = smbus_read_resources,
  95         .set_resources          = pci_dev_set_resources,
  96         .enable_resources       = pci_dev_enable_resources,
  97         .scan_bus               = scan_static_bus,
  98         .init                   = pch_smbus_init,
  99         .ops_smbus_bus          = &lops_smbus_bus,
 100         .ops_pci                = &smbus_pci_ops,
 101 };
 102
 103 static const struct pci_driver pch_smbus __pci_driver = {
 104         .ops    = &smbus_ops,
 105         .vendor = PCI_VENDOR_ID_INTEL,
 106         .device = 0x1c22,
 107 };
 108
 109 static const struct pci_driver pch_smbus_a __pci_driver = {
 110         .ops    = &smbus_ops,
 111         .vendor = PCI_VENDOR_ID_INTEL,
 112         .device = 0x1e22,
 113 };