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

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Carsten Langgaard, carstenl@mips.com
   4  * Copyright (C) 2000 MIPS Technologies, Inc.  All rights reserved.
   5  * Copyright (C) 2008 Dmitri Vorobiev
   6  */
   7 #include <linux/cpu.h>
   8 #include <linux/init.h>
   9 #include <linux/sched.h>
  10 #include <linux/ioport.h>
  11 #include <linux/irq.h>
  12 #include <linux/of_fdt.h>
  13 #include <linux/pci.h>
  14 #include <linux/screen_info.h>
  15 #include <linux/time.h>
  16
  17 #include <asm/dma-coherence.h>
  18 #include <asm/fw/fw.h>
  19 #include <asm/mips-cps.h>
  20 #include <asm/mips-boards/generic.h>
  21 #include <asm/mips-boards/malta.h>
  22 #include <asm/mips-boards/maltaint.h>
  23 #include <asm/dma.h>
  24 #include <asm/prom.h>
  25 #include <asm/traps.h>
  26 #ifdef CONFIG_VT
  27 #include <linux/console.h>
  28 #endif
  29
  30 #define ROCIT_CONFIG_GEN0               0x1f403000
  31 #define  ROCIT_CONFIG_GEN0_PCI_IOCU     BIT(7)
  32
  33 static struct resource standard_io_resources[] = {
  34         {
  35                 .name = "dma1",
  36                 .start = 0x00,
  37                 .end = 0x1f,
  38                 .flags = IORESOURCE_IO | IORESOURCE_BUSY
  39         },
  40         {
  41                 .name = "timer",
  42                 .start = 0x40,
  43                 .end = 0x5f,
  44                 .flags = IORESOURCE_IO | IORESOURCE_BUSY
  45         },
  46         {
  47                 .name = "keyboard",
  48                 .start = 0x60,
  49                 .end = 0x6f,
  50                 .flags = IORESOURCE_IO | IORESOURCE_BUSY
  51         },
  52         {
  53                 .name = "dma page reg",
  54                 .start = 0x80,
  55                 .end = 0x8f,
  56                 .flags = IORESOURCE_IO | IORESOURCE_BUSY
  57         },
  58         {
  59                 .name = "dma2",
  60                 .start = 0xc0,
  61                 .end = 0xdf,
  62                 .flags = IORESOURCE_IO | IORESOURCE_BUSY
  63         },
  64 };
  65
  66 const char *get_system_type(void)
  67 {
  68         return "MIPS Malta";
  69 }
  70
  71 #ifdef CONFIG_BLK_DEV_FD
  72 static void __init fd_activate(void)
  73 {
  74         /*
  75          * Activate Floppy Controller in the SMSC FDC37M817 Super I/O
  76          * Controller.
  77          * Done by YAMON 2.00 onwards
  78          */
  79         /* Entering config state. */
  80         SMSC_WRITE(SMSC_CONFIG_ENTER, SMSC_CONFIG_REG);
  81
  82         /* Activate floppy controller. */
  83         SMSC_WRITE(SMSC_CONFIG_DEVNUM, SMSC_CONFIG_REG);
  84         SMSC_WRITE(SMSC_CONFIG_DEVNUM_FLOPPY, SMSC_DATA_REG);
  85         SMSC_WRITE(SMSC_CONFIG_ACTIVATE, SMSC_CONFIG_REG);
  86         SMSC_WRITE(SMSC_CONFIG_ACTIVATE_ENABLE, SMSC_DATA_REG);
  87
  88         /* Exit config state. */
  89         SMSC_WRITE(SMSC_CONFIG_EXIT, SMSC_CONFIG_REG);
  90 }
  91 #endif
  92
  93 static int __init plat_enable_iocoherency(void)
  94 {
  95         int supported = 0;
  96         u32 cfg;
  97
  98         if (mips_revision_sconid == MIPS_REVISION_SCON_BONITO) {
  99                 if (BONITO_PCICACHECTRL & BONITO_PCICACHECTRL_CPUCOH_PRES) {
 100                         BONITO_PCICACHECTRL |= BONITO_PCICACHECTRL_CPUCOH_EN;
 101                         pr_info("Enabled Bonito CPU coherency\n");
 102                         supported = 1;
 103                 }
 104                 if (strstr(fw_getcmdline(), "iobcuncached")) {
 105                         BONITO_PCICACHECTRL &= ~BONITO_PCICACHECTRL_IOBCCOH_EN;
 106                         BONITO_PCIMEMBASECFG = BONITO_PCIMEMBASECFG &
 107                                 ~(BONITO_PCIMEMBASECFG_MEMBASE0_CACHED |
 108                                   BONITO_PCIMEMBASECFG_MEMBASE1_CACHED);
 109                         pr_info("Disabled Bonito IOBC coherency\n");
 110                 } else {
 111                         BONITO_PCICACHECTRL |= BONITO_PCICACHECTRL_IOBCCOH_EN;
 112                         BONITO_PCIMEMBASECFG |=
 113                                 (BONITO_PCIMEMBASECFG_MEMBASE0_CACHED |
 114                                  BONITO_PCIMEMBASECFG_MEMBASE1_CACHED);
 115                         pr_info("Enabled Bonito IOBC coherency\n");
 116                 }
 117         } else if (mips_cps_numiocu(0) != 0) {
 118                 /* Nothing special needs to be done to enable coherency */
 119                 pr_info("CMP IOCU detected\n");
 120                 cfg = __raw_readl((u32 *)CKSEG1ADDR(ROCIT_CONFIG_GEN0));
 121                 if (!(cfg & ROCIT_CONFIG_GEN0_PCI_IOCU)) {
 122                         pr_crit("IOCU OPERATION DISABLED BY SWITCH - DEFAULTING TO SW IO COHERENCY\n");
 123                         return 0;
 124                 }
 125                 supported = 1;
 126         }
 127         hw_coherentio = supported;
 128         return supported;
 129 }
 130
 131 static void __init plat_setup_iocoherency(void)
 132 {
 133         if (plat_enable_iocoherency()) {
 134                 if (coherentio == IO_COHERENCE_DISABLED)
 135                         pr_info("Hardware DMA cache coherency disabled\n");
 136                 else
 137                         pr_info("Hardware DMA cache coherency enabled\n");
 138         } else {
 139                 if (coherentio == IO_COHERENCE_ENABLED)
 140                         pr_info("Hardware DMA cache coherency unsupported, but enabled from command line!\n");
 141                 else
 142                         pr_info("Software DMA cache coherency enabled\n");
 143         }
 144 }
 145
 146 static void __init pci_clock_check(void)
 147 {
 148         unsigned int __iomem *jmpr_p =
 149                 (unsigned int *) ioremap(MALTA_JMPRS_REG, sizeof(unsigned int));
 150         int jmpr = (__raw_readl(jmpr_p) >> 2) & 0x07;
 151         static const int pciclocks[] __initconst = {
 152                 33, 20, 25, 30, 12, 16, 37, 10
 153         };
 154         int pciclock = pciclocks[jmpr];
 155         char *optptr, *argptr = fw_getcmdline();
 156
 157         /*
 158          * If user passed a pci_clock= option, don't tack on another one
 159          */
 160         optptr = strstr(argptr, "pci_clock=");
 161         if (optptr && (optptr == argptr || optptr[-1] == ' '))
 162                 return;
 163
 164         if (pciclock != 33) {
 165                 pr_warn("WARNING: PCI clock is %dMHz, setting pci_clock\n",
 166                         pciclock);
 167                 argptr += strlen(argptr);
 168                 sprintf(argptr, " pci_clock=%d", pciclock);
 169                 if (pciclock < 20 || pciclock > 66)
 170                         pr_warn("WARNING: IDE timing calculations will be "
 171                                 "incorrect\n");
 172         }
 173 }
 174
 175 #if defined(CONFIG_VT) && defined(CONFIG_VGA_CONSOLE)
 176 static void __init screen_info_setup(void)
 177 {
 178         screen_info = (struct screen_info) {
 179                 .orig_x = 0,
 180                 .orig_y = 25,
 181                 .ext_mem_k = 0,
 182                 .orig_video_page = 0,
 183                 .orig_video_mode = 0,
 184                 .orig_video_cols = 80,
 185                 .unused2 = 0,
 186                 .orig_video_ega_bx = 0,
 187                 .unused3 = 0,
 188                 .orig_video_lines = 25,
 189                 .orig_video_isVGA = VIDEO_TYPE_VGAC,
 190                 .orig_video_points = 16
 191         };
 192 }
 193 #endif
 194
 195 static void __init bonito_quirks_setup(void)
 196 {
 197         char *argptr;
 198
 199         argptr = fw_getcmdline();
 200         if (strstr(argptr, "debug")) {
 201                 BONITO_BONGENCFG |= BONITO_BONGENCFG_DEBUGMODE;
 202                 pr_info("Enabled Bonito debug mode\n");
 203         } else
 204                 BONITO_BONGENCFG &= ~BONITO_BONGENCFG_DEBUGMODE;
 205 }
 206
 207 void __init *plat_get_fdt(void)
 208 {
 209         return (void *)__dtb_start;
 210 }
 211
 212 void __init plat_mem_setup(void)
 213 {
 214         unsigned int i;
 215         void *fdt = plat_get_fdt();
 216
 217         fdt = malta_dt_shim(fdt);
 218         __dt_setup_arch(fdt);
 219
 220         if (IS_ENABLED(CONFIG_EVA))
 221                 /* EVA has already been configured in mach-malta/kernel-init.h */
 222                 pr_info("Enhanced Virtual Addressing (EVA) activated\n");
 223
 224         mips_pcibios_init();
 225
 226         /* Request I/O space for devices used on the Malta board. */
 227         for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
 228                 request_resource(&ioport_resource, standard_io_resources+i);
 229
 230         /*
 231          * Enable DMA channel 4 (cascade channel) in the PIIX4 south bridge.
 232          */
 233         enable_dma(4);
 234
 235         if (mips_revision_sconid == MIPS_REVISION_SCON_BONITO)
 236                 bonito_quirks_setup();
 237
 238         plat_setup_iocoherency();
 239
 240         pci_clock_check();
 241
 242 #ifdef CONFIG_BLK_DEV_FD
 243         fd_activate();
 244 #endif
 245
 246 #if defined(CONFIG_VT) && defined(CONFIG_VGA_CONSOLE)
 247         screen_info_setup();
 248 #endif
 249 }