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234 lines
5.3 KiB
234 lines
5.3 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (C) 2000, 2001, 2002, 2003 Broadcom Corporation |
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*/ |
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#include <linux/export.h> |
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#include <linux/init.h> |
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#include <linux/kernel.h> |
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#include <linux/reboot.h> |
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#include <linux/string.h> |
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#include <asm/bootinfo.h> |
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#include <asm/cpu.h> |
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#include <asm/mipsregs.h> |
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#include <asm/io.h> |
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#include <asm/sibyte/sb1250.h> |
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#include <asm/sibyte/sb1250_regs.h> |
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#include <asm/sibyte/sb1250_scd.h> |
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unsigned int sb1_pass; |
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unsigned int soc_pass; |
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unsigned int soc_type; |
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EXPORT_SYMBOL(soc_type); |
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unsigned int periph_rev; |
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EXPORT_SYMBOL_GPL(periph_rev); |
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unsigned int zbbus_mhz; |
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EXPORT_SYMBOL(zbbus_mhz); |
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static char *soc_str; |
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static char *pass_str; |
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static unsigned int war_pass; /* XXXKW don't overload PASS defines? */ |
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static int __init setup_bcm1250(void) |
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{ |
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int ret = 0; |
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switch (soc_pass) { |
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case K_SYS_REVISION_BCM1250_PASS1: |
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periph_rev = 1; |
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pass_str = "Pass 1"; |
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break; |
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case K_SYS_REVISION_BCM1250_A10: |
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periph_rev = 2; |
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pass_str = "A8/A10"; |
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/* XXXKW different war_pass? */ |
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war_pass = K_SYS_REVISION_BCM1250_PASS2; |
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break; |
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case K_SYS_REVISION_BCM1250_PASS2_2: |
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periph_rev = 2; |
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pass_str = "B1"; |
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break; |
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case K_SYS_REVISION_BCM1250_B2: |
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periph_rev = 2; |
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pass_str = "B2"; |
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war_pass = K_SYS_REVISION_BCM1250_PASS2_2; |
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break; |
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case K_SYS_REVISION_BCM1250_PASS3: |
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periph_rev = 3; |
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pass_str = "C0"; |
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break; |
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case K_SYS_REVISION_BCM1250_C1: |
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periph_rev = 3; |
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pass_str = "C1"; |
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break; |
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default: |
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if (soc_pass < K_SYS_REVISION_BCM1250_PASS2_2) { |
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periph_rev = 2; |
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pass_str = "A0-A6"; |
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war_pass = K_SYS_REVISION_BCM1250_PASS2; |
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} else { |
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printk("Unknown BCM1250 rev %x\n", soc_pass); |
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ret = 1; |
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} |
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break; |
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} |
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return ret; |
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} |
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int sb1250_m3_workaround_needed(void) |
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{ |
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switch (soc_type) { |
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case K_SYS_SOC_TYPE_BCM1250: |
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case K_SYS_SOC_TYPE_BCM1250_ALT: |
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case K_SYS_SOC_TYPE_BCM1250_ALT2: |
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case K_SYS_SOC_TYPE_BCM1125: |
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case K_SYS_SOC_TYPE_BCM1125H: |
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return soc_pass < K_SYS_REVISION_BCM1250_C0; |
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default: |
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return 0; |
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} |
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} |
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static int __init setup_bcm112x(void) |
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{ |
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int ret = 0; |
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switch (soc_pass) { |
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case 0: |
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/* Early build didn't have revid set */ |
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periph_rev = 3; |
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pass_str = "A1"; |
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war_pass = K_SYS_REVISION_BCM112x_A1; |
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break; |
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case K_SYS_REVISION_BCM112x_A1: |
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periph_rev = 3; |
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pass_str = "A1"; |
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break; |
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case K_SYS_REVISION_BCM112x_A2: |
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periph_rev = 3; |
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pass_str = "A2"; |
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break; |
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case K_SYS_REVISION_BCM112x_A3: |
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periph_rev = 3; |
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pass_str = "A3"; |
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break; |
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case K_SYS_REVISION_BCM112x_A4: |
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periph_rev = 3; |
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pass_str = "A4"; |
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break; |
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case K_SYS_REVISION_BCM112x_B0: |
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periph_rev = 3; |
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pass_str = "B0"; |
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break; |
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default: |
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printk("Unknown %s rev %x\n", soc_str, soc_pass); |
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ret = 1; |
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} |
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return ret; |
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} |
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/* Setup code likely to be common to all SiByte platforms */ |
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static int __init sys_rev_decode(void) |
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{ |
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int ret = 0; |
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war_pass = soc_pass; |
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switch (soc_type) { |
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case K_SYS_SOC_TYPE_BCM1250: |
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case K_SYS_SOC_TYPE_BCM1250_ALT: |
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case K_SYS_SOC_TYPE_BCM1250_ALT2: |
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soc_str = "BCM1250"; |
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ret = setup_bcm1250(); |
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break; |
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case K_SYS_SOC_TYPE_BCM1120: |
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soc_str = "BCM1120"; |
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ret = setup_bcm112x(); |
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break; |
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case K_SYS_SOC_TYPE_BCM1125: |
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soc_str = "BCM1125"; |
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ret = setup_bcm112x(); |
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break; |
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case K_SYS_SOC_TYPE_BCM1125H: |
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soc_str = "BCM1125H"; |
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ret = setup_bcm112x(); |
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break; |
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default: |
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printk("Unknown SOC type %x\n", soc_type); |
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ret = 1; |
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break; |
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} |
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return ret; |
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} |
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void __init sb1250_setup(void) |
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{ |
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uint64_t sys_rev; |
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int plldiv; |
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int bad_config = 0; |
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sb1_pass = read_c0_prid() & PRID_REV_MASK; |
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sys_rev = __raw_readq(IOADDR(A_SCD_SYSTEM_REVISION)); |
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soc_type = SYS_SOC_TYPE(sys_rev); |
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soc_pass = G_SYS_REVISION(sys_rev); |
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if (sys_rev_decode()) { |
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printk("Restart after failure to identify SiByte chip\n"); |
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machine_restart(NULL); |
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} |
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plldiv = G_SYS_PLL_DIV(__raw_readq(IOADDR(A_SCD_SYSTEM_CFG))); |
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zbbus_mhz = ((plldiv >> 1) * 50) + ((plldiv & 1) * 25); |
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printk("Broadcom SiByte %s %s @ %d MHz (SB1 rev %d)\n", |
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soc_str, pass_str, zbbus_mhz * 2, sb1_pass); |
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printk("Board type: %s\n", get_system_type()); |
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switch (war_pass) { |
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case K_SYS_REVISION_BCM1250_PASS1: |
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printk("@@@@ This is a BCM1250 A0-A2 (Pass 1) board, " |
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"and the kernel doesn't have the proper " |
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"workarounds compiled in. @@@@\n"); |
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bad_config = 1; |
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break; |
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case K_SYS_REVISION_BCM1250_PASS2: |
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/* Pass 2 - easiest as default for now - so many numbers */ |
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#if !defined(CONFIG_SB1_PASS_2_WORKAROUNDS) || \ |
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!defined(CONFIG_SB1_PASS_2_1_WORKAROUNDS) |
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printk("@@@@ This is a BCM1250 A3-A10 board, and the " |
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"kernel doesn't have the proper workarounds " |
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"compiled in. @@@@\n"); |
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bad_config = 1; |
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#endif |
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#ifdef CONFIG_CPU_HAS_PREFETCH |
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printk("@@@@ Prefetches may be enabled in this kernel, " |
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"but are buggy on this board. @@@@\n"); |
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bad_config = 1; |
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#endif |
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break; |
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case K_SYS_REVISION_BCM1250_PASS2_2: |
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#ifndef CONFIG_SB1_PASS_2_WORKAROUNDS |
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printk("@@@@ This is a BCM1250 B1/B2. board, and the " |
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"kernel doesn't have the proper workarounds " |
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"compiled in. @@@@\n"); |
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bad_config = 1; |
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#endif |
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#if defined(CONFIG_SB1_PASS_2_1_WORKAROUNDS) || \ |
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!defined(CONFIG_CPU_HAS_PREFETCH) |
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printk("@@@@ This is a BCM1250 B1/B2, but the kernel is " |
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"conservatively configured for an 'A' stepping. " |
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"@@@@\n"); |
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#endif |
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break; |
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default: |
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break; |
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} |
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if (bad_config) { |
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printk("Invalid configuration for this chip.\n"); |
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machine_restart(NULL); |
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} |
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}
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