src/southbridge/amd/sb600/sb600_lpc.c

   1 /*
   2  * This file is part of the coreboot project.
   3  *
   4  * Copyright (C) 2008 Advanced Micro Devices, Inc.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; version 2 of the License.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  18  */
  19
  20 #include <console/console.h>
  21 #include <device/device.h>
  22 #include <device/pci.h>
  23 #include <device/pnp.h>
  24 #include <device/pci_ids.h>
  25 #include <device/pci_ops.h>
  26 #include <pc80/mc146818rtc.h>
  27 #include <pc80/isa-dma.h>
  28 #include <bitops.h>
  29 #include <arch/io.h>
  30 #include "sb600.h"
  31
  32 static void lpc_init(device_t dev)
  33 {
  34         u8 byte;
  35         u32 dword;
  36         device_t sm_dev;
  37
  38         /* Enable the LPC Controller */
  39         sm_dev = dev_find_slot(0, PCI_DEVFN(0x14, 0));
  40         dword = pci_read_config32(sm_dev, 0x64);
  41         dword |= 1 << 20;
  42         pci_write_config32(sm_dev, 0x64, dword);
  43
  44         /* Initialize isa dma */
  45         isa_dma_init();
  46
  47         /* RPR 7.2 Enable DMA transaction on the LPC bus */
  48         byte = pci_read_config8(dev, 0x40);
  49         byte |= (1 << 2);
  50         pci_write_config8(dev, 0x40, byte);
  51
  52         /* RPR 7.3 Disable the timeout mechanism on LPC */
  53         byte = pci_read_config8(dev, 0x48);
  54         byte &= ~(1 << 7);
  55         pci_write_config8(dev, 0x48, byte);
  56
  57         /* RPR 7.5 Disable LPC MSI Capability */
  58         byte = pci_read_config8(dev, 0x78);
  59         byte &= ~(1 << 1);
  60         pci_write_config8(dev, 0x78, byte);
  61
  62 }
  63
  64 static void sb600_lpc_read_resources(device_t dev)
  65 {
  66         struct resource *res;
  67
  68         /* Get the normal pci resources of this device */
  69         pci_dev_read_resources(dev);    /* We got one for APIC, or one more for TRAP */
  70
  71         pci_get_resource(dev, 0xA0); /* SPI ROM base address */
  72
  73         /* Add an extra subtractive resource for both memory and I/O */
  74         res = new_resource(dev, IOINDEX_SUBTRACTIVE(0, 0));
  75         res->flags =
  76             IORESOURCE_IO | IORESOURCE_SUBTRACTIVE | IORESOURCE_ASSIGNED;
  77
  78         res = new_resource(dev, IOINDEX_SUBTRACTIVE(1, 0));
  79         res->flags =
  80             IORESOURCE_MEM | IORESOURCE_SUBTRACTIVE | IORESOURCE_ASSIGNED;
  81
  82         compact_resources(dev);
  83 }
  84
  85 /**
  86  * @brief Enable resources for children devices
  87  *
  88  * @param dev the device whos children's resources are to be enabled
  89  *
  90  * This function is call by the global enable_resources() indirectly via the
  91  * device_operation::enable_resources() method of devices.
  92  *
  93  * Indirect mutual recursion:
  94  *      enable_childrens_resources() -> enable_resources()
  95  *      enable_resources() -> device_operation::enable_resources()
  96  *      device_operation::enable_resources() -> enable_children_resources()
  97  */
  98 static void sb600_lpc_enable_childrens_resources(device_t dev)
  99 {
 100         u32 link;
 101         u32 reg, reg_x;
 102         int i;
 103         int var_num = 0;
 104         u16 reg_var[3];
 105
 106         reg = pci_read_config32(dev, 0x44);
 107         reg_x = pci_read_config32(dev, 0x48);
 108
 109         for (link = 0; link < dev->links; link++) {
 110                 device_t child;
 111                 for (child = dev->link[link].children; child;
 112                      child = child->sibling) {
 113                         enable_resources(child);
 114                         if (child->have_resources
 115                             && (child->path.type == DEVICE_PATH_PNP)) {
 116                                 for (i = 0; i < child->resources; i++) {
 117                                         struct resource *res;
 118                                         unsigned long base, end;        /*  don't need long long */
 119                                         res = &child->resource[i];
 120                                         if (!(res->flags & IORESOURCE_IO))
 121                                                 continue;
 122                                         base = res->base;
 123                                         end = resource_end(res);
 124                                         printk_debug
 125                                             ("sb600 lpc decode:%s, base=0x%08x, end=0x%08x\n",
 126                                              dev_path(child), base, end);
 127                                         switch (base) {
 128                                         case 0x60:      /*  KB */
 129                                         case 0x64:      /*  MS */
 130                                                 reg |= (1 << 29);
 131                                                 break;
 132                                         case 0x3f8:     /*  COM1 */
 133                                                 reg |= (1 << 6);
 134                                                 break;
 135                                         case 0x2f8:     /*  COM2 */
 136                                                 reg |= (1 << 7);
 137                                                 break;
 138                                         case 0x378:     /*  Parallal 1 */
 139                                                 reg |= (1 << 0);
 140                                                 break;
 141                                         case 0x3f0:     /*  FD0 */
 142                                                 reg |= (1 << 26);
 143                                                 break;
 144                                         case 0x220:     /*  Aduio 0 */
 145                                                 reg |= (1 << 8);
 146                                                 break;
 147                                         case 0x300:     /*  Midi 0 */
 148                                                 reg |= (1 << 18);
 149                                                 break;
 150                                         case 0x400:
 151                                                 reg_x |= (1 << 16);
 152                                                 break;
 153                                         case 0x480:
 154                                                 reg_x |= (1 << 17);
 155                                                 break;
 156                                         case 0x500:
 157                                                 reg_x |= (1 << 18);
 158                                                 break;
 159                                         case 0x580:
 160                                                 reg_x |= (1 << 19);
 161                                                 break;
 162                                         case 0x4700:
 163                                                 reg_x |= (1 << 22);
 164                                                 break;
 165                                         case 0xfd60:
 166                                                 reg_x |= (1 << 23);
 167                                                 break;
 168                                         default:
 169                                                 if (var_num >= 3)
 170                                                         continue;       /* only 3 var ; compact them ? */
 171                                                 switch (var_num) {
 172                                                 case 0:
 173                                                         reg_x |= (1 << 2);
 174                                                         break;
 175                                                 case 1:
 176                                                         reg_x |= (1 << 24);
 177                                                         break;
 178                                                 case 2:
 179                                                         reg_x |= (1 << 25);
 180                                                         break;
 181                                                 }
 182                                                 reg_var[var_num++] =
 183                                                     base & 0xffff;
 184                                         }
 185                                 }
 186                         }
 187                 }
 188         }
 189         pci_write_config32(dev, 0x44, reg);
 190         pci_write_config32(dev, 0x48, reg_x);
 191         /* Set WideIO for as many IOs found (fall through is on purpose) */
 192         switch (var_num) {
 193         case 2:
 194                 pci_write_config16(dev, 0x90, reg_var[2]);
 195         case 1:
 196                 pci_write_config16(dev, 0x66, reg_var[1]);
 197         case 0:
 198                 pci_write_config16(dev, 0x64, reg_var[0]);
 199                 break;
 200         }
 201 }
 202
 203 static void sb600_lpc_enable_resources(device_t dev)
 204 {
 205         pci_dev_enable_resources(dev);
 206         sb600_lpc_enable_childrens_resources(dev);
 207 }
 208
 209 static struct pci_operations lops_pci = {
 210         .set_subsystem = pci_dev_set_subsystem,
 211 };
 212
 213 static struct device_operations lpc_ops = {
 214         .read_resources = sb600_lpc_read_resources,
 215         .set_resources = pci_dev_set_resources,
 216         .enable_resources = sb600_lpc_enable_resources,
 217         .init = lpc_init,
 218         .scan_bus = scan_static_bus,
 219         /* .enable           = sb600_enable, */
 220         .ops_pci = &lops_pci,
 221 };
 222 static struct pci_driver lpc_driver __pci_driver = {
 223         .ops = &lpc_ops,
 224         .vendor = PCI_VENDOR_ID_ATI,
 225         .device = PCI_DEVICE_ID_ATI_SB600_LPC,
 226 };