setup.c

  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * Copyright (C) 2000,2001,2002,2003,2004 Broadcom Corporation
  4 */
  5#include <linux/init.h>
  6#include <linux/kernel.h>
  7#include <linux/export.h>
  8#include <linux/reboot.h>
  9#include <linux/string.h>
 10
 11#include <asm/bootinfo.h>
 12#include <asm/cpu.h>
 13#include <asm/mipsregs.h>
 14#include <asm/io.h>
 15#include <asm/sibyte/sb1250.h>
 16
 17#include <asm/sibyte/bcm1480_regs.h>
 18#include <asm/sibyte/bcm1480_scd.h>
 19#include <asm/sibyte/sb1250_scd.h>
 20
 21unsigned int sb1_pass;
 22unsigned int soc_pass;
 23unsigned int soc_type;
 24EXPORT_SYMBOL(soc_type);
 25unsigned int periph_rev;
 26EXPORT_SYMBOL_GPL(periph_rev);
 27unsigned int zbbus_mhz;
 28EXPORT_SYMBOL(zbbus_mhz);
 29
 30static unsigned int part_type;
 31
 32static char *soc_str;
 33static char *pass_str;
 34
 35static int __init setup_bcm1x80_bcm1x55(void)
 36{
 37	switch (soc_pass) {
 38	case K_SYS_REVISION_BCM1480_S0:
 39		periph_rev = 1;
 40		pass_str = "S0 (pass1)";
 41		break;
 42	case K_SYS_REVISION_BCM1480_A1:
 43		periph_rev = 1;
 44		pass_str = "A1 (pass1)";
 45		break;
 46	case K_SYS_REVISION_BCM1480_A2:
 47		periph_rev = 1;
 48		pass_str = "A2 (pass1)";
 49		break;
 50	case K_SYS_REVISION_BCM1480_A3:
 51		periph_rev = 1;
 52		pass_str = "A3 (pass1)";
 53		break;
 54	case K_SYS_REVISION_BCM1480_B0:
 55		periph_rev = 1;
 56		pass_str = "B0 (pass2)";
 57		break;
 58	default:
 59		printk("Unknown %s rev %x\n", soc_str, soc_pass);
 60		periph_rev = 1;
 61		pass_str = "Unknown Revision";
 62		break;
 63	}
 64
 65	return 0;
 66}
 67
 68/* Setup code likely to be common to all SiByte platforms */
 69
 70static int __init sys_rev_decode(void)
 71{
 72	int ret = 0;
 73
 74	switch (soc_type) {
 75	case K_SYS_SOC_TYPE_BCM1x80:
 76		if (part_type == K_SYS_PART_BCM1480)
 77		    soc_str = "BCM1480";
 78		else if (part_type == K_SYS_PART_BCM1280)
 79		    soc_str = "BCM1280";
 80		else
 81		    soc_str = "BCM1x80";
 82		ret = setup_bcm1x80_bcm1x55();
 83		break;
 84
 85	case K_SYS_SOC_TYPE_BCM1x55:
 86		if (part_type == K_SYS_PART_BCM1455)
 87		    soc_str = "BCM1455";
 88		else if (part_type == K_SYS_PART_BCM1255)
 89		    soc_str = "BCM1255";
 90		else
 91		    soc_str = "BCM1x55";
 92		ret = setup_bcm1x80_bcm1x55();
 93		break;
 94
 95	default:
 96		printk("Unknown part type %x\n", part_type);
 97		ret = 1;
 98		break;
 99	}
100
101	return ret;
102}
103
104void __init bcm1480_setup(void)
105{
106	uint64_t sys_rev;
107	int plldiv;
108
109	sb1_pass = read_c0_prid() & PRID_REV_MASK;
110	sys_rev = __raw_readq(IOADDR(A_SCD_SYSTEM_REVISION));
111	soc_type = SYS_SOC_TYPE(sys_rev);
112	part_type = G_SYS_PART(sys_rev);
113	soc_pass = G_SYS_REVISION(sys_rev);
114
115	if (sys_rev_decode()) {
116		printk("Restart after failure to identify SiByte chip\n");
117		machine_restart(NULL);
118	}
119
120	plldiv = G_BCM1480_SYS_PLL_DIV(__raw_readq(IOADDR(A_SCD_SYSTEM_CFG)));
121	zbbus_mhz = ((plldiv >> 1) * 50) + ((plldiv & 1) * 25);
122
123	printk("Broadcom SiByte %s %s @ %d MHz (SB-1A rev %d)\n",
124		    soc_str, pass_str, zbbus_mhz * 2, sb1_pass);
125	printk("Board type: %s\n", get_system_type());
126}