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/of_fdt.h>
  25 #include <linux/pci.h>
  26 #include <linux/screen_info.h>
  27 #include <linux/time.h>
  28
  29 #include <asm/fw/fw.h>
  30 #include <asm/mach-malta/malta-dtshim.h>
  31 #include <asm/mips-cps.h>
  32 #include <asm/mips-boards/generic.h>
  33 #include <asm/mips-boards/malta.h>
  34 #include <asm/mips-boards/maltaint.h>
  35 #include <asm/dma.h>
  36 #include <asm/prom.h>
  37 #include <asm/traps.h>
  38 #ifdef CONFIG_VT
  39 #include <linux/console.h>
  40 #endif
  41
  42 #define ROCIT_CONFIG_GEN0               0x1f403000
  43 #define  ROCIT_CONFIG_GEN0_PCI_IOCU     BIT(7)
  44
  45 static struct resource standard_io_resources[] = {
  46         {
  47                 .name = "dma1",
  48                 .start = 0x00,
  49                 .end = 0x1f,
  50                 .flags = IORESOURCE_IO | IORESOURCE_BUSY
  51         },
  52         {
  53                 .name = "timer",
  54                 .start = 0x40,
  55                 .end = 0x5f,
  56                 .flags = IORESOURCE_IO | IORESOURCE_BUSY
  57         },
  58         {
  59                 .name = "keyboard",
  60                 .start = 0x60,
  61                 .end = 0x6f,
  62                 .flags = IORESOURCE_IO | IORESOURCE_BUSY
  63         },
  64         {
  65                 .name = "dma page reg",
  66                 .start = 0x80,
  67                 .end = 0x8f,
  68                 .flags = IORESOURCE_IO | IORESOURCE_BUSY
  69         },
  70         {
  71                 .name = "dma2",
  72                 .start = 0xc0,
  73                 .end = 0xdf,
  74                 .flags = IORESOURCE_IO | IORESOURCE_BUSY
  75         },
  76 };
  77
  78 const char *get_system_type(void)
  79 {
  80         return "MIPS Malta";
  81 }
  82
  83 const char display_string[] = "        LINUX ON MALTA       ";
  84
  85 #ifdef CONFIG_BLK_DEV_FD
  86 static void __init fd_activate(void)
  87 {
  88         /*
  89          * Activate Floppy Controller in the SMSC FDC37M817 Super I/O
  90          * Controller.
  91          * Done by YAMON 2.00 onwards
  92          */
  93         /* Entering config state. */
  94         SMSC_WRITE(SMSC_CONFIG_ENTER, SMSC_CONFIG_REG);
  95
  96         /* Activate floppy controller. */
  97         SMSC_WRITE(SMSC_CONFIG_DEVNUM, SMSC_CONFIG_REG);
  98         SMSC_WRITE(SMSC_CONFIG_DEVNUM_FLOPPY, SMSC_DATA_REG);
  99         SMSC_WRITE(SMSC_CONFIG_ACTIVATE, SMSC_CONFIG_REG);
 100         SMSC_WRITE(SMSC_CONFIG_ACTIVATE_ENABLE, SMSC_DATA_REG);
 101
 102         /* Exit config state. */
 103         SMSC_WRITE(SMSC_CONFIG_EXIT, SMSC_CONFIG_REG);
 104 }
 105 #endif
 106
 107 static int __init plat_enable_iocoherency(void)
 108 {
 109         int supported = 0;
 110         u32 cfg;
 111
 112         if (mips_revision_sconid == MIPS_REVISION_SCON_BONITO) {
 113                 if (BONITO_PCICACHECTRL & BONITO_PCICACHECTRL_CPUCOH_PRES) {
 114                         BONITO_PCICACHECTRL |= BONITO_PCICACHECTRL_CPUCOH_EN;
 115                         pr_info("Enabled Bonito CPU coherency\n");
 116                         supported = 1;
 117                 }
 118                 if (strstr(fw_getcmdline(), "iobcuncached")) {
 119                         BONITO_PCICACHECTRL &= ~BONITO_PCICACHECTRL_IOBCCOH_EN;
 120                         BONITO_PCIMEMBASECFG = BONITO_PCIMEMBASECFG &
 121                                 ~(BONITO_PCIMEMBASECFG_MEMBASE0_CACHED |
 122                                   BONITO_PCIMEMBASECFG_MEMBASE1_CACHED);
 123                         pr_info("Disabled Bonito IOBC coherency\n");
 124                 } else {
 125                         BONITO_PCICACHECTRL |= BONITO_PCICACHECTRL_IOBCCOH_EN;
 126                         BONITO_PCIMEMBASECFG |=
 127                                 (BONITO_PCIMEMBASECFG_MEMBASE0_CACHED |
 128                                  BONITO_PCIMEMBASECFG_MEMBASE1_CACHED);
 129                         pr_info("Enabled Bonito IOBC coherency\n");
 130                 }
 131         } else if (mips_cps_numiocu(0) != 0) {
 132                 /* Nothing special needs to be done to enable coherency */
 133                 pr_info("CMP IOCU detected\n");
 134                 cfg = __raw_readl((u32 *)CKSEG1ADDR(ROCIT_CONFIG_GEN0));
 135                 if (!(cfg & ROCIT_CONFIG_GEN0_PCI_IOCU)) {
 136                         pr_crit("IOCU OPERATION DISABLED BY SWITCH - DEFAULTING TO SW IO COHERENCY\n");
 137                         return 0;
 138                 }
 139                 supported = 1;
 140         }
 141         hw_coherentio = supported;
 142         return supported;
 143 }
 144
 145 static void __init plat_setup_iocoherency(void)
 146 {
 147 #ifdef CONFIG_DMA_NONCOHERENT
 148         /*
 149          * Kernel has been configured with software coherency
 150          * but we might choose to turn it off and use hardware
 151          * coherency instead.
 152          */
 153         if (plat_enable_iocoherency()) {
 154                 if (coherentio == IO_COHERENCE_DISABLED)
 155                         pr_info("Hardware DMA cache coherency disabled\n");
 156                 else
 157                         pr_info("Hardware DMA cache coherency enabled\n");
 158         } else {
 159                 if (coherentio == IO_COHERENCE_ENABLED)
 160                         pr_info("Hardware DMA cache coherency unsupported, but enabled from command line!\n");
 161                 else
 162                         pr_info("Software DMA cache coherency enabled\n");
 163         }
 164 #else
 165         if (!plat_enable_iocoherency())
 166                 panic("Hardware DMA cache coherency not supported!");
 167 #endif
 168 }
 169
 170 static void __init pci_clock_check(void)
 171 {
 172         unsigned int __iomem *jmpr_p =
 173                 (unsigned int *) ioremap(MALTA_JMPRS_REG, sizeof(unsigned int));
 174         int jmpr = (__raw_readl(jmpr_p) >> 2) & 0x07;
 175         static const int pciclocks[] __initconst = {
 176                 33, 20, 25, 30, 12, 16, 37, 10
 177         };
 178         int pciclock = pciclocks[jmpr];
 179         char *optptr, *argptr = fw_getcmdline();
 180
 181         /*
 182          * If user passed a pci_clock= option, don't tack on another one
 183          */
 184         optptr = strstr(argptr, "pci_clock=");
 185         if (optptr && (optptr == argptr || optptr[-1] == ' '))
 186                 return;
 187
 188         if (pciclock != 33) {
 189                 pr_warn("WARNING: PCI clock is %dMHz, setting pci_clock\n",
 190                         pciclock);
 191                 argptr += strlen(argptr);
 192                 sprintf(argptr, " pci_clock=%d", pciclock);
 193                 if (pciclock < 20 || pciclock > 66)
 194                         pr_warn("WARNING: IDE timing calculations will be "
 195                                 "incorrect\n");
 196         }
 197 }
 198
 199 #if defined(CONFIG_VT) && defined(CONFIG_VGA_CONSOLE)
 200 static void __init screen_info_setup(void)
 201 {
 202         screen_info = (struct screen_info) {
 203                 .orig_x = 0,
 204                 .orig_y = 25,
 205                 .ext_mem_k = 0,
 206                 .orig_video_page = 0,
 207                 .orig_video_mode = 0,
 208                 .orig_video_cols = 80,
 209                 .unused2 = 0,
 210                 .orig_video_ega_bx = 0,
 211                 .unused3 = 0,
 212                 .orig_video_lines = 25,
 213                 .orig_video_isVGA = VIDEO_TYPE_VGAC,
 214                 .orig_video_points = 16
 215         };
 216 }
 217 #endif
 218
 219 static void __init bonito_quirks_setup(void)
 220 {
 221         char *argptr;
 222
 223         argptr = fw_getcmdline();
 224         if (strstr(argptr, "debug")) {
 225                 BONITO_BONGENCFG |= BONITO_BONGENCFG_DEBUGMODE;
 226                 pr_info("Enabled Bonito debug mode\n");
 227         } else
 228                 BONITO_BONGENCFG &= ~BONITO_BONGENCFG_DEBUGMODE;
 229
 230 #ifdef CONFIG_DMA_COHERENT
 231         if (BONITO_PCICACHECTRL & BONITO_PCICACHECTRL_CPUCOH_PRES) {
 232                 BONITO_PCICACHECTRL |= BONITO_PCICACHECTRL_CPUCOH_EN;
 233                 pr_info("Enabled Bonito CPU coherency\n");
 234
 235                 argptr = fw_getcmdline();
 236                 if (strstr(argptr, "iobcuncached")) {
 237                         BONITO_PCICACHECTRL &= ~BONITO_PCICACHECTRL_IOBCCOH_EN;
 238                         BONITO_PCIMEMBASECFG = BONITO_PCIMEMBASECFG &
 239                                 ~(BONITO_PCIMEMBASECFG_MEMBASE0_CACHED |
 240                                         BONITO_PCIMEMBASECFG_MEMBASE1_CACHED);
 241                         pr_info("Disabled Bonito IOBC coherency\n");
 242                 } else {
 243                         BONITO_PCICACHECTRL |= BONITO_PCICACHECTRL_IOBCCOH_EN;
 244                         BONITO_PCIMEMBASECFG |=
 245                                 (BONITO_PCIMEMBASECFG_MEMBASE0_CACHED |
 246                                         BONITO_PCIMEMBASECFG_MEMBASE1_CACHED);
 247                         pr_info("Enabled Bonito IOBC coherency\n");
 248                 }
 249         } else
 250                 panic("Hardware DMA cache coherency not supported");
 251 #endif
 252 }
 253
 254 void __init *plat_get_fdt(void)
 255 {
 256         return (void *)__dtb_start;
 257 }
 258
 259 void __init plat_mem_setup(void)
 260 {
 261         unsigned int i;
 262         void *fdt = plat_get_fdt();
 263
 264         fdt = malta_dt_shim(fdt);
 265         __dt_setup_arch(fdt);
 266
 267         if (IS_ENABLED(CONFIG_EVA))
 268                 /* EVA has already been configured in mach-malta/kernel-init.h */
 269                 pr_info("Enhanced Virtual Addressing (EVA) activated\n");
 270
 271         mips_pcibios_init();
 272
 273         /* Request I/O space for devices used on the Malta board. */
 274         for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
 275                 request_resource(&ioport_resource, standard_io_resources+i);
 276
 277         /*
 278          * Enable DMA channel 4 (cascade channel) in the PIIX4 south bridge.
 279          */
 280         enable_dma(4);
 281
 282 #ifdef CONFIG_DMA_COHERENT
 283         if (mips_revision_sconid != MIPS_REVISION_SCON_BONITO)
 284                 panic("Hardware DMA cache coherency not supported");
 285 #endif
 286
 287         if (mips_revision_sconid == MIPS_REVISION_SCON_BONITO)
 288                 bonito_quirks_setup();
 289
 290         plat_setup_iocoherency();
 291
 292         pci_clock_check();
 293
 294 #ifdef CONFIG_BLK_DEV_FD
 295         fd_activate();
 296 #endif
 297
 298 #if defined(CONFIG_VT) && defined(CONFIG_VGA_CONSOLE)
 299         screen_info_setup();
 300 #endif
 301 }