src/southbridge/amd/sb700/sb700_lpc.c

   1 /*
   2  * This file is part of the coreboot project.
   3  *
   4  * Copyright (C) 2010 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 "sb700.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 #if CONFIG_SOUTHBRIDGE_AMD_SB700_SKIP_ISA_DMA_INIT
  46         printk(BIOS_DEBUG, "Skipping isa_dma_init() to avoid getting stuck.\n");
  47 #else
  48         isa_dma_init();
  49 #endif
  50
  51         /* Enable DMA transaction on the LPC bus */
  52         byte = pci_read_config8(dev, 0x40);
  53         byte |= (1 << 2);
  54         pci_write_config8(dev, 0x40, byte);
  55
  56         /* Disable the timeout mechanism on LPC */
  57         byte = pci_read_config8(dev, 0x48);
  58         byte &= ~(1 << 7);
  59         pci_write_config8(dev, 0x48, byte);
  60
  61         /* Disable LPC MSI Capability */
  62         byte = pci_read_config8(dev, 0x78);
  63         byte &= ~(1 << 1);
  64         pci_write_config8(dev, 0x78, byte);
  65 }
  66
  67 static void sb700_lpc_read_resources(device_t dev)
  68 {
  69         struct resource *res;
  70
  71         /* Get the normal pci resources of this device */
  72         pci_dev_read_resources(dev);    /* We got one for APIC, or one more for TRAP */
  73
  74         pci_get_resource(dev, 0xA0); /* SPI ROM base address */
  75
  76         /* Add an extra subtractive resource for both memory and I/O. */
  77         res = new_resource(dev, IOINDEX_SUBTRACTIVE(0, 0));
  78         res->base = 0;
  79         res->size = 0x1000;
  80         res->flags = IORESOURCE_IO | IORESOURCE_SUBTRACTIVE |
  81                      IORESOURCE_ASSIGNED | IORESOURCE_FIXED;
  82
  83         res = new_resource(dev, IOINDEX_SUBTRACTIVE(1, 0));
  84         res->base = 0xff800000;
  85         res->size = 0x00800000; /* 8 MB for flash */
  86         res->flags = IORESOURCE_MEM | IORESOURCE_SUBTRACTIVE |
  87                      IORESOURCE_ASSIGNED | IORESOURCE_FIXED;
  88
  89         res = new_resource(dev, 3); /* IOAPIC */
  90         res->base = 0xfec00000;
  91         res->size = 0x00001000;
  92         res->flags = IORESOURCE_MEM | IORESOURCE_ASSIGNED | IORESOURCE_FIXED;
  93
  94         compact_resources(dev);
  95 }
  96
  97 static void sb700_lpc_set_resources(struct device *dev)
  98 {
  99         struct resource *res;
 100
 101         pci_dev_set_resources(dev);
 102
 103         /* Specical case. SPI Base Address. The SpiRomEnable should be set. */
 104         res = find_resource(dev, 0xA0);
 105         pci_write_config32(dev, 0xA0, res->base | 1 << 1);
 106 }
 107
 108 /**
 109  * @brief Enable resources for children devices
 110  *
 111  * @param dev the device whose children's resources are to be enabled
 112  *
 113  */
 114 static void sb700_lpc_enable_childrens_resources(device_t dev)
 115 {
 116         struct bus *link;
 117         u32 reg, reg_x;
 118         int var_num = 0;
 119         u16 reg_var[3];
 120
 121         reg = pci_read_config32(dev, 0x44);
 122         reg_x = pci_read_config32(dev, 0x48);
 123
 124         for (link = dev->link_list; link; link = link->next) {
 125                 device_t child;
 126                 for (child = link->children; child;
 127                      child = child->sibling) {
 128                         if (child->enabled
 129                             && (child->path.type == DEVICE_PATH_PNP)) {
 130                                 struct resource *res;
 131                                 for (res = child->resource_list; res; res = res->next) {
 132                                         u32 base, end;  /*  don't need long long */
 133                                         if (!(res->flags & IORESOURCE_IO))
 134                                                 continue;
 135                                         base = res->base;
 136                                         end = resource_end(res);
 137                                         printk(BIOS_DEBUG, "sb700 lpc decode:%s, base=0x%08x, end=0x%08x\n",
 138                                              dev_path(child), base, end);
 139                                         switch (base) {
 140                                         case 0x60:      /*  KB */
 141                                         case 0x64:      /*  MS */
 142                                                 reg |= (1 << 29);
 143                                                 break;
 144                                         case 0x3f8:     /*  COM1 */
 145                                                 reg |= (1 << 6);
 146                                                 break;
 147                                         case 0x2f8:     /*  COM2 */
 148                                                 reg |= (1 << 7);
 149                                                 break;
 150                                         case 0x378:     /*  Parallal 1 */
 151                                                 reg |= (1 << 0);
 152                                                 break;
 153                                         case 0x3f0:     /*  FD0 */
 154                                                 reg |= (1 << 26);
 155                                                 break;
 156                                         case 0x220:     /*  Aduio 0 */
 157                                                 reg |= (1 << 8);
 158                                                 break;
 159                                         case 0x300:     /*  Midi 0 */
 160                                                 reg |= (1 << 18);
 161                                                 break;
 162                                         case 0x400:
 163                                                 reg_x |= (1 << 16);
 164                                                 break;
 165                                         case 0x480:
 166                                                 reg_x |= (1 << 17);
 167                                                 break;
 168                                         case 0x500:
 169                                                 reg_x |= (1 << 18);
 170                                                 break;
 171                                         case 0x580:
 172                                                 reg_x |= (1 << 19);
 173                                                 break;
 174                                         case 0x4700:
 175                                                 reg_x |= (1 << 22);
 176                                                 break;
 177                                         case 0xfd60:
 178                                                 reg_x |= (1 << 23);
 179                                                 break;
 180                                         default:
 181                                                 if (var_num >= 3)
 182                                                         continue;       /* only 3 var ; compact them ? */
 183                                                 switch (var_num) {
 184                                                 case 0:
 185                                                         reg_x |= (1 << 2);
 186                                                         break;
 187                                                 case 1:
 188                                                         reg_x |= (1 << 24);
 189                                                         break;
 190                                                 case 2:
 191                                                         reg_x |= (1 << 25);
 192                                                         break;
 193                                                 }
 194                                                 reg_var[var_num++] =
 195                                                     base & 0xffff;
 196                                         }
 197                                 }
 198                         }
 199                 }
 200         }
 201         pci_write_config32(dev, 0x44, reg);
 202         pci_write_config32(dev, 0x48, reg_x);
 203         /* Set WideIO for as many IOs found (fall through is on purpose) */
 204         switch (var_num) {
 205         case 2:
 206                 pci_write_config16(dev, 0x90, reg_var[2]);
 207         case 1:
 208                 pci_write_config16(dev, 0x66, reg_var[1]);
 209         case 0:
 210                 pci_write_config16(dev, 0x64, reg_var[0]);
 211                 break;
 212         }
 213 }
 214
 215 static void sb700_lpc_enable_resources(device_t dev)
 216 {
 217         pci_dev_enable_resources(dev);
 218         sb700_lpc_enable_childrens_resources(dev);
 219 }
 220
 221 static struct pci_operations lops_pci = {
 222         .set_subsystem = pci_dev_set_subsystem,
 223 };
 224
 225 static struct device_operations lpc_ops = {
 226         .read_resources = sb700_lpc_read_resources,
 227         .set_resources = sb700_lpc_set_resources,
 228         .enable_resources = sb700_lpc_enable_resources,
 229         .init = lpc_init,
 230         .scan_bus = scan_static_bus,
 231         .ops_pci = &lops_pci,
 232 };
 233 static const struct pci_driver lpc_driver __pci_driver = {
 234         .ops = &lpc_ops,
 235         .vendor = PCI_VENDOR_ID_ATI,
 236         .device = PCI_DEVICE_ID_ATI_SB700_LPC,
 237 };