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 #include <linux/dma-map-ops.h> /* for dma_default_coherent */ 17 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 void __init plat_setup_iocoherency(void) 94 { 95 u32 cfg; 96 97 if (mips_revision_sconid == MIPS_REVISION_SCON_BONITO) { 98 if (BONITO_PCICACHECTRL & BONITO_PCICACHECTRL_CPUCOH_PRES) { 99 BONITO_PCICACHECTRL |= BONITO_PCICACHECTRL_CPUCOH_EN; 100 pr_info("Enabled Bonito CPU coherency\n"); 101 dma_default_coherent = true; 102 } 103 if (strstr(fw_getcmdline(), "iobcuncached")) { 104 BONITO_PCICACHECTRL &= ~BONITO_PCICACHECTRL_IOBCCOH_EN; 105 BONITO_PCIMEMBASECFG = BONITO_PCIMEMBASECFG & 106 ~(BONITO_PCIMEMBASECFG_MEMBASE0_CACHED | 107 BONITO_PCIMEMBASECFG_MEMBASE1_CACHED); 108 pr_info("Disabled Bonito IOBC coherency\n"); 109 } else { 110 BONITO_PCICACHECTRL |= BONITO_PCICACHECTRL_IOBCCOH_EN; 111 BONITO_PCIMEMBASECFG |= 112 (BONITO_PCIMEMBASECFG_MEMBASE0_CACHED | 113 BONITO_PCIMEMBASECFG_MEMBASE1_CACHED); 114 pr_info("Enabled Bonito IOBC coherency\n"); 115 } 116 } else if (mips_cps_numiocu(0) != 0) { 117 /* Nothing special needs to be done to enable coherency */ 118 pr_info("CMP IOCU detected\n"); 119 cfg = __raw_readl((u32 *)CKSEG1ADDR(ROCIT_CONFIG_GEN0)); 120 if (cfg & ROCIT_CONFIG_GEN0_PCI_IOCU) 121 dma_default_coherent = true; 122 else 123 pr_crit("IOCU OPERATION DISABLED BY SWITCH - DEFAULTING TO SW IO COHERENCY\n"); 124 } 125 126 if (dma_default_coherent) 127 pr_info("Hardware DMA cache coherency enabled\n"); 128 else 129 pr_info("Software DMA cache coherency enabled\n"); 130 } 131 132 static void __init pci_clock_check(void) 133 { 134 unsigned int __iomem *jmpr_p = 135 (unsigned int *) ioremap(MALTA_JMPRS_REG, sizeof(unsigned int)); 136 int jmpr = (__raw_readl(jmpr_p) >> 2) & 0x07; 137 static const int pciclocks[] __initconst = { 138 33, 20, 25, 30, 12, 16, 37, 10 139 }; 140 int pciclock = pciclocks[jmpr]; 141 char *optptr, *argptr = fw_getcmdline(); 142 143 /* 144 * If user passed a pci_clock= option, don't tack on another one 145 */ 146 optptr = strstr(argptr, "pci_clock="); 147 if (optptr && (optptr == argptr || optptr[-1] == ' ')) 148 return; 149 150 if (pciclock != 33) { 151 pr_warn("WARNING: PCI clock is %dMHz, setting pci_clock\n", 152 pciclock); 153 argptr += strlen(argptr); 154 sprintf(argptr, " pci_clock=%d", pciclock); 155 if (pciclock < 20 || pciclock > 66) 156 pr_warn("WARNING: IDE timing calculations will be " 157 "incorrect\n"); 158 } 159 } 160 161 #if defined(CONFIG_VT) && defined(CONFIG_VGA_CONSOLE) 162 static void __init screen_info_setup(void) 163 { 164 screen_info = (struct screen_info) { 165 .orig_x = 0, 166 .orig_y = 25, 167 .ext_mem_k = 0, 168 .orig_video_page = 0, 169 .orig_video_mode = 0, 170 .orig_video_cols = 80, 171 .unused2 = 0, 172 .orig_video_ega_bx = 0, 173 .unused3 = 0, 174 .orig_video_lines = 25, 175 .orig_video_isVGA = VIDEO_TYPE_VGAC, 176 .orig_video_points = 16 177 }; 178 } 179 #endif 180 181 static void __init bonito_quirks_setup(void) 182 { 183 char *argptr; 184 185 argptr = fw_getcmdline(); 186 if (strstr(argptr, "debug")) { 187 BONITO_BONGENCFG |= BONITO_BONGENCFG_DEBUGMODE; 188 pr_info("Enabled Bonito debug mode\n"); 189 } else 190 BONITO_BONGENCFG &= ~BONITO_BONGENCFG_DEBUGMODE; 191 } 192 193 void __init *plat_get_fdt(void) 194 { 195 return (void *)__dtb_start; 196 } 197 198 void __init plat_mem_setup(void) 199 { 200 unsigned int i; 201 void *fdt = plat_get_fdt(); 202 203 fdt = malta_dt_shim(fdt); 204 __dt_setup_arch(fdt); 205 206 if (IS_ENABLED(CONFIG_EVA)) 207 /* EVA has already been configured in mach-malta/kernel-init.h */ 208 pr_info("Enhanced Virtual Addressing (EVA) activated\n"); 209 210 mips_pcibios_init(); 211 212 /* Request I/O space for devices used on the Malta board. */ 213 for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++) 214 request_resource(&ioport_resource, standard_io_resources+i); 215 216 /* 217 * Enable DMA channel 4 (cascade channel) in the PIIX4 south bridge. 218 */ 219 enable_dma(4); 220 221 if (mips_revision_sconid == MIPS_REVISION_SCON_BONITO) 222 bonito_quirks_setup(); 223 224 plat_setup_iocoherency(); 225 226 pci_clock_check(); 227 228 #ifdef CONFIG_BLK_DEV_FD 229 fd_activate(); 230 #endif 231 232 #if defined(CONFIG_VT) && defined(CONFIG_VGA_CONSOLE) 233 screen_info_setup(); 234 #endif 235 } 236