Initial import

1 files changed, 248 insertions, 0 deletions

diff --git a/arch/mips/sibyte/sb1250/setup.c b/arch/mips/sibyte/sb1250/setup.c
new file mode 100644
index 000000000..3c02b2a77
--- /dev/null
+++ b/arch/mips/sibyte/sb1250/setup.c
@@ -0,0 +1,248 @@
+/*
+ * Copyright (C) 2000, 2001, 2002, 2003 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ */
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/reboot.h>
+#include <linux/string.h>
+
+#include <asm/bootinfo.h>
+#include <asm/cpu.h>
+#include <asm/mipsregs.h>
+#include <asm/io.h>
+#include <asm/sibyte/sb1250.h>
+#include <asm/sibyte/sb1250_regs.h>
+#include <asm/sibyte/sb1250_scd.h>
+
+unsigned int sb1_pass;
+unsigned int soc_pass;
+unsigned int soc_type;
+EXPORT_SYMBOL(soc_type);
+unsigned int periph_rev;
+unsigned int zbbus_mhz;
+EXPORT_SYMBOL(zbbus_mhz);
+
+static char *soc_str;
+static char *pass_str;
+static unsigned int war_pass;	/* XXXKW don't overload PASS defines? */
+
+static int __init setup_bcm1250(void)
+{
+	int ret = 0;
+
+	switch (soc_pass) {
+	case K_SYS_REVISION_BCM1250_PASS1:
+		periph_rev = 1;
+		pass_str = "Pass 1";
+		break;
+	case K_SYS_REVISION_BCM1250_A10:
+		periph_rev = 2;
+		pass_str = "A8/A10";
+		/* XXXKW different war_pass? */
+		war_pass = K_SYS_REVISION_BCM1250_PASS2;
+		break;
+	case K_SYS_REVISION_BCM1250_PASS2_2:
+		periph_rev = 2;
+		pass_str = "B1";
+		break;
+	case K_SYS_REVISION_BCM1250_B2:
+		periph_rev = 2;
+		pass_str = "B2";
+		war_pass = K_SYS_REVISION_BCM1250_PASS2_2;
+		break;
+	case K_SYS_REVISION_BCM1250_PASS3:
+		periph_rev = 3;
+		pass_str = "C0";
+		break;
+	case K_SYS_REVISION_BCM1250_C1:
+		periph_rev = 3;
+		pass_str = "C1";
+		break;
+	default:
+		if (soc_pass < K_SYS_REVISION_BCM1250_PASS2_2) {
+			periph_rev = 2;
+			pass_str = "A0-A6";
+			war_pass = K_SYS_REVISION_BCM1250_PASS2;
+		} else {
+			printk("Unknown BCM1250 rev %x\n", soc_pass);
+			ret = 1;
+		}
+		break;
+	}
+
+	return ret;
+}
+
+int sb1250_m3_workaround_needed(void)
+{
+	switch (soc_type) {
+	case K_SYS_SOC_TYPE_BCM1250:
+	case K_SYS_SOC_TYPE_BCM1250_ALT:
+	case K_SYS_SOC_TYPE_BCM1250_ALT2:
+	case K_SYS_SOC_TYPE_BCM1125:
+	case K_SYS_SOC_TYPE_BCM1125H:
+		return soc_pass < K_SYS_REVISION_BCM1250_C0;
+
+	default:
+		return 0;
+	}
+}
+
+static int __init setup_bcm112x(void)
+{
+	int ret = 0;
+
+	switch (soc_pass) {
+	case 0:
+		/* Early build didn't have revid set */
+		periph_rev = 3;
+		pass_str = "A1";
+		war_pass = K_SYS_REVISION_BCM112x_A1;
+		break;
+	case K_SYS_REVISION_BCM112x_A1:
+		periph_rev = 3;
+		pass_str = "A1";
+		break;
+	case K_SYS_REVISION_BCM112x_A2:
+		periph_rev = 3;
+		pass_str = "A2";
+		break;
+	case K_SYS_REVISION_BCM112x_A3:
+		periph_rev = 3;
+		pass_str = "A3";
+		break;
+	case K_SYS_REVISION_BCM112x_A4:
+		periph_rev = 3;
+		pass_str = "A4";
+		break;
+	case K_SYS_REVISION_BCM112x_B0:
+		periph_rev = 3;
+		pass_str = "B0";
+		break;
+	default:
+		printk("Unknown %s rev %x\n", soc_str, soc_pass);
+		ret = 1;
+	}
+
+	return ret;
+}
+
+/* Setup code likely to be common to all SiByte platforms */
+
+static int __init sys_rev_decode(void)
+{
+	int ret = 0;
+
+	war_pass = soc_pass;
+	switch (soc_type) {
+	case K_SYS_SOC_TYPE_BCM1250:
+	case K_SYS_SOC_TYPE_BCM1250_ALT:
+	case K_SYS_SOC_TYPE_BCM1250_ALT2:
+		soc_str = "BCM1250";
+		ret = setup_bcm1250();
+		break;
+	case K_SYS_SOC_TYPE_BCM1120:
+		soc_str = "BCM1120";
+		ret = setup_bcm112x();
+		break;
+	case K_SYS_SOC_TYPE_BCM1125:
+		soc_str = "BCM1125";
+		ret = setup_bcm112x();
+		break;
+	case K_SYS_SOC_TYPE_BCM1125H:
+		soc_str = "BCM1125H";
+		ret = setup_bcm112x();
+		break;
+	default:
+		printk("Unknown SOC type %x\n", soc_type);
+		ret = 1;
+		break;
+	}
+
+	return ret;
+}
+
+void __init sb1250_setup(void)
+{
+	uint64_t sys_rev;
+	int plldiv;
+	int bad_config = 0;
+
+	sb1_pass = read_c0_prid() & PRID_REV_MASK;
+	sys_rev = __raw_readq(IOADDR(A_SCD_SYSTEM_REVISION));
+	soc_type = SYS_SOC_TYPE(sys_rev);
+	soc_pass = G_SYS_REVISION(sys_rev);
+
+	if (sys_rev_decode()) {
+		printk("Restart after failure to identify SiByte chip\n");
+		machine_restart(NULL);
+	}
+
+	plldiv = G_SYS_PLL_DIV(__raw_readq(IOADDR(A_SCD_SYSTEM_CFG)));
+	zbbus_mhz = ((plldiv >> 1) * 50) + ((plldiv & 1) * 25);
+
+	printk("Broadcom SiByte %s %s @ %d MHz (SB1 rev %d)\n",
+		    soc_str, pass_str, zbbus_mhz * 2, sb1_pass);
+	printk("Board type: %s\n", get_system_type());
+
+	switch (war_pass) {
+	case K_SYS_REVISION_BCM1250_PASS1:
+#ifndef CONFIG_SB1_PASS_1_WORKAROUNDS
+		printk("@@@@ This is a BCM1250 A0-A2 (Pass 1) board, "
+			    "and the kernel doesn't have the proper "
+			    "workarounds compiled in. @@@@\n");
+		bad_config = 1;
+#endif
+		break;
+	case K_SYS_REVISION_BCM1250_PASS2:
+		/* Pass 2 - easiest as default for now - so many numbers */
+#if !defined(CONFIG_SB1_PASS_2_WORKAROUNDS) || \
+    !defined(CONFIG_SB1_PASS_2_1_WORKAROUNDS)
+		printk("@@@@ This is a BCM1250 A3-A10 board, and the "
+			    "kernel doesn't have the proper workarounds "
+			    "compiled in. @@@@\n");
+		bad_config = 1;
+#endif
+#ifdef CONFIG_CPU_HAS_PREFETCH
+		printk("@@@@ Prefetches may be enabled in this kernel, "
+			    "but are buggy on this board.  @@@@\n");
+		bad_config = 1;
+#endif
+		break;
+	case K_SYS_REVISION_BCM1250_PASS2_2:
+#ifndef CONFIG_SB1_PASS_2_WORKAROUNDS
+		printk("@@@@ This is a BCM1250 B1/B2. board, and the "
+			    "kernel doesn't have the proper workarounds "
+			    "compiled in. @@@@\n");
+		bad_config = 1;
+#endif
+#if defined(CONFIG_SB1_PASS_2_1_WORKAROUNDS) || \
+    !defined(CONFIG_CPU_HAS_PREFETCH)
+		printk("@@@@ This is a BCM1250 B1/B2, but the kernel is "
+			    "conservatively configured for an 'A' stepping. "
+			    "@@@@\n");
+#endif
+		break;
+	default:
+		break;
+	}
+	if (bad_config) {
+		printk("Invalid configuration for this chip.\n");
+		machine_restart(NULL);
+	}
+}