arch/mips/mti-malta/malta-setup.c

   1 /*
   2  * Carsten Langgaard, carstenl@mips.com
   3  * Copyright (C) 2000 MIPS Technologies, Inc.  All rights reserved.
   4  * Copyright (C) 2008 Dmitri Vorobiev
   5  *
   6  *  This program is free software; you can distribute it and/or modify it
   7  *  under the terms of the GNU General Public License (Version 2) as
   8  *  published by the Free Software Foundation.
   9  *
  10  *  This program is distributed in the hope it will be useful, but WITHOUT
  11  *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13  *  for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License along
  16  *  with this program; if not, write to the Free Software Foundation, Inc.,
  17  *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
  18  */
  19 #include <linux/cpu.h>
  20 #include <linux/init.h>
  21 #include <linux/sched.h>
  22 #include <linux/ioport.h>
  23 #include <linux/irq.h>
  24 #include <linux/pci.h>
  25 #include <linux/screen_info.h>
  26 #include <linux/time.h>
  27
  28 #include <asm/fw/fw.h>
  29 #include <asm/mips-boards/generic.h>
  30 #include <asm/mips-boards/malta.h>
  31 #include <asm/mips-boards/maltaint.h>
  32 #include <asm/dma.h>
  33 #include <asm/traps.h>
  34 #include <asm/gcmpregs.h>
  35 #ifdef CONFIG_VT
  36 #include <linux/console.h>
  37 #endif
  38
  39 extern void malta_be_init(void);
  40 extern int malta_be_handler(struct pt_regs *regs, int is_fixup);
  41
  42 static struct resource standard_io_resources[] = {
  43         {
  44                 .name = "dma1",
  45                 .start = 0x00,
  46                 .end = 0x1f,
  47                 .flags = IORESOURCE_BUSY
  48         },
  49         {
  50                 .name = "timer",
  51                 .start = 0x40,
  52                 .end = 0x5f,
  53                 .flags = IORESOURCE_BUSY
  54         },
  55         {
  56                 .name = "keyboard",
  57                 .start = 0x60,
  58                 .end = 0x6f,
  59                 .flags = IORESOURCE_BUSY
  60         },
  61         {
  62                 .name = "dma page reg",
  63                 .start = 0x80,
  64                 .end = 0x8f,
  65                 .flags = IORESOURCE_BUSY
  66         },
  67         {
  68                 .name = "dma2",
  69                 .start = 0xc0,
  70                 .end = 0xdf,
  71                 .flags = IORESOURCE_BUSY
  72         },
  73 };
  74
  75 const char *get_system_type(void)
  76 {
  77         return "MIPS Malta";
  78 }
  79
  80 #if defined(CONFIG_MIPS_MT_SMTC)
  81 const char display_string[] = "       SMTC LINUX ON MALTA       ";
  82 #else
  83 const char display_string[] = "        LINUX ON MALTA       ";
  84 #endif /* CONFIG_MIPS_MT_SMTC */
  85
  86 #ifdef CONFIG_BLK_DEV_FD
  87 static void __init fd_activate(void)
  88 {
  89         /*
  90          * Activate Floppy Controller in the SMSC FDC37M817 Super I/O
  91          * Controller.
  92          * Done by YAMON 2.00 onwards
  93          */
  94         /* Entering config state. */
  95         SMSC_WRITE(SMSC_CONFIG_ENTER, SMSC_CONFIG_REG);
  96
  97         /* Activate floppy controller. */
  98         SMSC_WRITE(SMSC_CONFIG_DEVNUM, SMSC_CONFIG_REG);
  99         SMSC_WRITE(SMSC_CONFIG_DEVNUM_FLOPPY, SMSC_DATA_REG);
 100         SMSC_WRITE(SMSC_CONFIG_ACTIVATE, SMSC_CONFIG_REG);
 101         SMSC_WRITE(SMSC_CONFIG_ACTIVATE_ENABLE, SMSC_DATA_REG);
 102
 103         /* Exit config state. */
 104         SMSC_WRITE(SMSC_CONFIG_EXIT, SMSC_CONFIG_REG);
 105 }
 106 #endif
 107
 108 static int __init plat_enable_iocoherency(void)
 109 {
 110         int supported = 0;
 111         if (mips_revision_sconid == MIPS_REVISION_SCON_BONITO) {
 112                 if (BONITO_PCICACHECTRL & BONITO_PCICACHECTRL_CPUCOH_PRES) {
 113                         BONITO_PCICACHECTRL |= BONITO_PCICACHECTRL_CPUCOH_EN;
 114                         pr_info("Enabled Bonito CPU coherency\n");
 115                         supported = 1;
 116                 }
 117                 if (strstr(fw_getcmdline(), "iobcuncached")) {
 118                         BONITO_PCICACHECTRL &= ~BONITO_PCICACHECTRL_IOBCCOH_EN;
 119                         BONITO_PCIMEMBASECFG = BONITO_PCIMEMBASECFG &
 120                                 ~(BONITO_PCIMEMBASECFG_MEMBASE0_CACHED |
 121                                   BONITO_PCIMEMBASECFG_MEMBASE1_CACHED);
 122                         pr_info("Disabled Bonito IOBC coherency\n");
 123                 } else {
 124                         BONITO_PCICACHECTRL |= BONITO_PCICACHECTRL_IOBCCOH_EN;
 125                         BONITO_PCIMEMBASECFG |=
 126                                 (BONITO_PCIMEMBASECFG_MEMBASE0_CACHED |
 127                                  BONITO_PCIMEMBASECFG_MEMBASE1_CACHED);
 128                         pr_info("Enabled Bonito IOBC coherency\n");
 129                 }
 130         } else if (gcmp_niocu() != 0) {
 131                 /* Nothing special needs to be done to enable coherency */
 132                 pr_info("CMP IOCU detected\n");
 133                 if ((*(unsigned int *)0xbf403000 & 0x81) != 0x81) {
 134                         pr_crit("IOCU OPERATION DISABLED BY SWITCH - DEFAULTING TO SW IO COHERENCY\n");
 135                         return 0;
 136                 }
 137                 supported = 1;
 138         }
 139         hw_coherentio = supported;
 140         return supported;
 141 }
 142
 143 static void __init plat_setup_iocoherency(void)
 144 {
 145 #ifdef CONFIG_DMA_NONCOHERENT
 146         /*
 147          * Kernel has been configured with software coherency
 148          * but we might choose to turn it off and use hardware
 149          * coherency instead.
 150          */
 151         if (plat_enable_iocoherency()) {
 152                 if (coherentio == 0)
 153                         pr_info("Hardware DMA cache coherency disabled\n");
 154                 else
 155                         pr_info("Hardware DMA cache coherency enabled\n");
 156         } else {
 157                 if (coherentio == 1)
 158                         pr_info("Hardware DMA cache coherency unsupported, but enabled from command line!\n");
 159                 else
 160                         pr_info("Software DMA cache coherency enabled\n");
 161         }
 162 #else
 163         if (!plat_enable_iocoherency())
 164                 panic("Hardware DMA cache coherency not supported!");
 165 #endif
 166 }
 167
 168 #ifdef CONFIG_BLK_DEV_IDE
 169 static void __init pci_clock_check(void)
 170 {
 171         unsigned int __iomem *jmpr_p =
 172                 (unsigned int *) ioremap(MALTA_JMPRS_REG, sizeof(unsigned int));
 173         int jmpr = (__raw_readl(jmpr_p) >> 2) & 0x07;
 174         static const int pciclocks[] __initconst = {
 175                 33, 20, 25, 30, 12, 16, 37, 10
 176         };
 177         int pciclock = pciclocks[jmpr];
 178         char *argptr = fw_getcmdline();
 179
 180         if (pciclock != 33 && !strstr(argptr, "idebus=")) {
 181                 pr_warn("WARNING: PCI clock is %dMHz, setting idebus\n",
 182                         pciclock);
 183                 argptr += strlen(argptr);
 184                 sprintf(argptr, " idebus=%d", pciclock);
 185                 if (pciclock < 20 || pciclock > 66)
 186                         pr_warn("WARNING: IDE timing calculations will be incorrect\n");
 187         }
 188 }
 189 #endif
 190
 191 #if defined(CONFIG_VT) && defined(CONFIG_VGA_CONSOLE)
 192 static void __init screen_info_setup(void)
 193 {
 194         screen_info = (struct screen_info) {
 195                 .orig_x = 0,
 196                 .orig_y = 25,
 197                 .ext_mem_k = 0,
 198                 .orig_video_page = 0,
 199                 .orig_video_mode = 0,
 200                 .orig_video_cols = 80,
 201                 .unused2 = 0,
 202                 .orig_video_ega_bx = 0,
 203                 .unused3 = 0,
 204                 .orig_video_lines = 25,
 205                 .orig_video_isVGA = VIDEO_TYPE_VGAC,
 206                 .orig_video_points = 16
 207         };
 208 }
 209 #endif
 210
 211 static void __init bonito_quirks_setup(void)
 212 {
 213         char *argptr;
 214
 215         argptr = fw_getcmdline();
 216         if (strstr(argptr, "debug")) {
 217                 BONITO_BONGENCFG |= BONITO_BONGENCFG_DEBUGMODE;
 218                 pr_info("Enabled Bonito debug mode\n");
 219         } else
 220                 BONITO_BONGENCFG &= ~BONITO_BONGENCFG_DEBUGMODE;
 221
 222 #ifdef CONFIG_DMA_COHERENT
 223         if (BONITO_PCICACHECTRL & BONITO_PCICACHECTRL_CPUCOH_PRES) {
 224                 BONITO_PCICACHECTRL |= BONITO_PCICACHECTRL_CPUCOH_EN;
 225                 pr_info("Enabled Bonito CPU coherency\n");
 226
 227                 argptr = fw_getcmdline();
 228                 if (strstr(argptr, "iobcuncached")) {
 229                         BONITO_PCICACHECTRL &= ~BONITO_PCICACHECTRL_IOBCCOH_EN;
 230                         BONITO_PCIMEMBASECFG = BONITO_PCIMEMBASECFG &
 231                                 ~(BONITO_PCIMEMBASECFG_MEMBASE0_CACHED |
 232                                         BONITO_PCIMEMBASECFG_MEMBASE1_CACHED);
 233                         pr_info("Disabled Bonito IOBC coherency\n");
 234                 } else {
 235                         BONITO_PCICACHECTRL |= BONITO_PCICACHECTRL_IOBCCOH_EN;
 236                         BONITO_PCIMEMBASECFG |=
 237                                 (BONITO_PCIMEMBASECFG_MEMBASE0_CACHED |
 238                                         BONITO_PCIMEMBASECFG_MEMBASE1_CACHED);
 239                         pr_info("Enabled Bonito IOBC coherency\n");
 240                 }
 241         } else
 242                 panic("Hardware DMA cache coherency not supported");
 243 #endif
 244 }
 245
 246 void __init plat_mem_setup(void)
 247 {
 248         unsigned int i;
 249
 250         mips_pcibios_init();
 251
 252         /* Request I/O space for devices used on the Malta board. */
 253         for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
 254                 request_resource(&ioport_resource, standard_io_resources+i);
 255
 256         /*
 257          * Enable DMA channel 4 (cascade channel) in the PIIX4 south bridge.
 258          */
 259         enable_dma(4);
 260
 261 #ifdef CONFIG_DMA_COHERENT
 262         if (mips_revision_sconid != MIPS_REVISION_SCON_BONITO)
 263                 panic("Hardware DMA cache coherency not supported");
 264 #endif
 265
 266         if (mips_revision_sconid == MIPS_REVISION_SCON_BONITO)
 267                 bonito_quirks_setup();
 268
 269         plat_setup_iocoherency();
 270
 271 #ifdef CONFIG_BLK_DEV_IDE
 272         pci_clock_check();
 273 #endif
 274
 275 #ifdef CONFIG_BLK_DEV_FD
 276         fd_activate();
 277 #endif
 278
 279 #if defined(CONFIG_VT) && defined(CONFIG_VGA_CONSOLE)
 280         screen_info_setup();
 281 #endif
 282
 283         board_be_init = malta_be_init;
 284         board_be_handler = malta_be_handler;
 285 }