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      1 /*	$NetBSD: machdep.c,v 1.15 2024/03/05 14:15:31 thorpej Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2011 CradlePoint Technology, Inc.
      5  * All rights reserved.
      6  *
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  *
     17  * THIS SOFTWARE IS PROVIDED BY CRADLEPOINT TECHNOLOGY, INC. AND CONTRIBUTORS
     18  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     19  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     20  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
     21  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     22  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     23  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     24  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     25  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     26  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     27  * POSSIBILITY OF SUCH DAMAGE.
     28  */
     29 
     30 #include <sys/cdefs.h>			/* RCS ID & Copyright macro defns */
     31 __KERNEL_RCSID(0, "$NetBSD: machdep.c,v 1.15 2024/03/05 14:15:31 thorpej Exp $");
     32 
     33 #include <sys/param.h>
     34 #include <sys/boot_flag.h>
     35 #include <sys/buf.h>
     36 #include <sys/cpu.h>
     37 #include <sys/device.h>
     38 #include <sys/mount.h>
     39 #include <sys/kcore.h>
     40 #include <sys/reboot.h>
     41 #include <sys/systm.h>
     42 #include <sys/kernel.h>
     43 #include <sys/termios.h>
     44 
     45 #include <uvm/uvm_extern.h>
     46 
     47 #include <dev/cons.h>
     48 
     49 #include <mips/cache.h>
     50 #include <mips/locore.h>
     51 #include <mips/cpuregs.h>
     52 
     53 #include <mips/ralink/ralink_reg.h>
     54 #include <mips/ralink/ralink_var.h>
     55 
     56 /* structures we define/alloc for other files in the kernel */
     57 struct vm_map *phys_map = NULL;
     58 
     59 int mem_cluster_cnt = 0;
     60 phys_ram_seg_t mem_clusters[VM_PHYSSEG_MAX];
     61 
     62 void mach_init(void);
     63 
     64 static inline uint32_t
     65 sysctl_read(u_int offset)
     66 {
     67 	return *RA_IOREG_VADDR(RA_SYSCTL_BASE, offset);
     68 }
     69 
     70 static inline void
     71 sysctl_write(u_int offset, uint32_t val)
     72 {
     73 	*RA_IOREG_VADDR(RA_SYSCTL_BASE, offset) = val;
     74 }
     75 
     76 static void
     77 cal_timer(void)
     78 {
     79 	uint32_t cntfreq;
     80 
     81 	cntfreq = curcpu()->ci_cpu_freq = RA_CLOCK_RATE;
     82 
     83 	/* MIPS 4Kc CP0 counts every other clock */
     84 	if (mips_options.mips_cpu_flags & CPU_MIPS_DOUBLE_COUNT)
     85 		cntfreq /= 2;
     86 
     87 	curcpu()->ci_cycles_per_hz = (cntfreq + hz / 2) / hz;
     88 
     89 	/* Compute number of cycles per 1us (1/MHz). 0.5MHz is for roundup. */
     90 	curcpu()->ci_divisor_delay = ((cntfreq + 500000) / 1000000);
     91 }
     92 
     93 void
     94 mach_init(void)
     95 {
     96 	vaddr_t kernend;
     97 	psize_t memsize;
     98 
     99 	extern char kernel_text[];
    100 	extern char edata[], end[];	/* From Linker */
    101 
    102 	/* clear the BSS segment */
    103 	kernend = mips_round_page(end);
    104 
    105 	memset(edata, 0, kernend - (vaddr_t)edata);
    106 
    107 #ifdef RALINK_CONSOLE_EARLY
    108 	/*
    109 	 * set up early console
    110 	 *  cannot printf until sometime (?) in mips_vector_init
    111 	 *  meanwhile can use the ra_console_putc primitive if necessary
    112 	 */
    113 	ralink_console_early();
    114 #endif
    115 
    116 	/* set CPU model info for sysctl_hw */
    117 	uint32_t tmp1, tmp2;
    118 	char id1[5], id2[5];
    119 	tmp1 = sysctl_read(RA_SYSCTL_ID0);
    120 	memcpy(id1, &tmp1, sizeof(tmp1));
    121 	tmp2 = sysctl_read(RA_SYSCTL_ID1);
    122 	memcpy(id2, &tmp2, sizeof(tmp2));
    123 	id2[4] = id1[4] = '\0';
    124 	if (id2[2] == ' ') {
    125 		id2[2] = '\0';
    126 	} else if (id2[3] == ' ') {
    127 		id2[3] = '\0';
    128 	} else {
    129 		id2[4] = '\0';
    130 	}
    131 	cpu_setmodel("%s%s", id1, id2);
    132 
    133 	/*
    134 	 * Set up the exception vectors and CPU-specific function
    135 	 * vectors early on.  We need the wbflush() vector set up
    136 	 * before comcnattach() is called (or at least before the
    137 	 * first printf() after that is called).
    138 	 * Sets up mips_cpu_flags that may be queried by other
    139 	 * functions called during startup.
    140 	 * Also clears the I+D caches.
    141 	 */
    142 	mips_vector_init(NULL, false);
    143 
    144 	/*
    145 	 * Calibrate timers.
    146 	 */
    147 	cal_timer();
    148 
    149 	uvm_md_init();
    150 
    151 	/*
    152 	 * Look at arguments passed to us and compute boothowto.
    153 	 */
    154 	boothowto = RB_AUTOBOOT;
    155 #ifdef KADB
    156 	boothowto |= RB_KDB;
    157 #endif
    158 
    159 	/*
    160 	 * Determine the memory size.
    161 	 */
    162 #if defined(MT7620) || defined(MT7628)
    163 	memsize = 128 << 20;
    164 #else
    165 	memsize = *(volatile uint32_t *)
    166 	    MIPS_PHYS_TO_KSEG1(RA_SYSCTL_BASE + RA_SYSCTL_CFG0);
    167 	memsize = __SHIFTOUT(memsize, SYSCTL_CFG0_DRAM_SIZE);
    168 	if (__predict_false(memsize == 0)) {
    169 		memsize = 2 << 20;
    170 	} else {
    171 		memsize = 4 << (20 + memsize);
    172 	}
    173 #endif
    174 
    175 	physmem = btoc(memsize);
    176 
    177 	mem_clusters[mem_cluster_cnt].start = 0;
    178 	mem_clusters[mem_cluster_cnt].size = memsize;
    179 	mem_cluster_cnt++;
    180 
    181 	/*
    182 	 * Load the memory into the VM system
    183 	 */
    184 	mips_page_physload((vaddr_t)kernel_text, kernend,
    185 	    mem_clusters, mem_cluster_cnt,
    186 	    NULL, 0);
    187 
    188 	/*
    189 	 * Initialize message buffer (at end of core).
    190 	 */
    191 	mips_init_msgbuf();
    192 
    193 	/*
    194 	 * Initialize the virtual memory system.
    195 	 */
    196 	pmap_bootstrap();
    197 
    198 	/*
    199 	 * Init mapping for u page(s) for proc0.
    200 	 */
    201 	mips_init_lwp0_uarea();
    202 
    203 	/*
    204 	 * Initialize busses.
    205 	 */
    206 	ra_bus_init();
    207 
    208 #ifdef DDB
    209 	if (boothowto & RB_KDB)
    210 		Debugger();
    211 #endif
    212 }
    213 
    214 void
    215 cpu_startup(void)
    216 {
    217 	cpu_startup_common();
    218 }
    219 
    220 void
    221 cpu_reboot(int howto, char *bootstr)
    222 {
    223 	static int waittime = -1;
    224 
    225 	/* Take a snapshot before clobbering any registers. */
    226 	savectx(lwp_getpcb(curlwp));
    227 
    228 	/* If "always halt" was specified as a boot flag, obey. */
    229 	if (boothowto & RB_HALT)
    230 		howto |= RB_HALT;
    231 
    232 	boothowto = howto;
    233 
    234 	/* If system is cold, just halt. */
    235 	if (cold) {
    236 		boothowto |= RB_HALT;
    237 		goto haltsys;
    238 	}
    239 
    240 	if ((boothowto & RB_NOSYNC) == 0 && waittime < 0) {
    241 		waittime = 0;
    242 
    243 		/*
    244 		 * Synchronize the disks....
    245 		 */
    246 		vfs_shutdown();
    247 	}
    248 
    249 	/* Disable interrupts. */
    250 	splhigh();
    251 
    252 	if (boothowto & RB_DUMP)
    253 		dumpsys();
    254 
    255  haltsys:
    256 	/* Run any shutdown hooks. */
    257 	doshutdownhooks();
    258 
    259 	pmf_system_shutdown(boothowto);
    260 
    261 	/*
    262 	 * Firmware may autoboot (depending on settings), and we cannot pass
    263 	 * flags to it (at least I haven't figured out how to yet), so
    264 	 * we "pseudo-halt" now.
    265 	 */
    266 	if (boothowto & RB_HALT) {
    267 		printf("\n");
    268 		printf("The operating system has halted.\n");
    269 		printf("Please press any key to reboot.\n\n");
    270 		cnpollc(1);	/* For proper keyboard command handling */
    271 		cngetc();
    272 		cnpollc(0);
    273 	}
    274 
    275 	printf("resetting board...\n\n");
    276 	mips_icache_sync_all();
    277 	mips_dcache_wbinv_all();
    278 
    279 	sysctl_write(RA_SYSCTL_RST, 1);  /* SoC Reset */
    280 	sysctl_write(RA_SYSCTL_RST, 0);
    281 
    282 #if 0
    283 	__asm volatile("jr	%0" :: "r"(MIPS_RESET_EXC_VEC));
    284 #endif
    285 	printf("Oops, back from reset\n\nSpinning...");
    286 	for (;;)
    287 		/* spin forever */ ;	/* XXX */
    288 	/*NOTREACHED*/
    289 }
    290 
    291 #define NO_SECURITY_MAGIC	0x27051958
    292 #define SERIAL_MAGIC		0x100000
    293 int
    294 ra_check_memo_reg(int key)
    295 {
    296 	uint32_t magic;
    297 
    298 	/*
    299 	 * These registers may be overwritten.  Keep the value around in case
    300 	 * it is used later.  Bitmask 1 == security, 2 = serial
    301 	 */
    302 	static int keyvalue;
    303 
    304 	switch (key) {
    305 	case NO_SECURITY:
    306 		magic = sysctl_read(RA_SYSCTL_MEMO0);
    307 		if ((NO_SECURITY_MAGIC == magic) || ((keyvalue & 1) != 0)) {
    308 			keyvalue |= 1;
    309 			return 1;
    310 		}
    311 		return 0;
    312 		break;
    313 
    314 	case SERIAL_CONSOLE:
    315 		magic = sysctl_read(RA_SYSCTL_MEMO1);
    316 		if (magic == 0
    317 		    || (SERIAL_MAGIC & magic) != 0
    318 		    || (keyvalue & 2) != 0) {
    319 			keyvalue |= 2;
    320 			return 1;
    321 		}
    322 		return 0;
    323 		break;
    324 
    325 	default:
    326 		return 0;
    327 	}
    328 
    329 }
    330