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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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ecafe3e9b2
If we fail to register any real SMP implementations, fall back to registering the dummy UP implementation. Otherwise when we build an SMP kernel & run it on a system where the SMP implementations fail to probe (eg. QEMU) the kernel will perform a NULL dereference attempting to call mp_ops->smp_setup() from plat_smp_setup(). Notably this fixes booting kernels with CPS SMP enabled on QEMU, which doesn't currently implement the CM, CPC or GIC. Signed-off-by: Paul Burton <paul.burton@imgtec.com> Cc: linux-mips@linux-mips.org Cc: Peter Hurley <peter@hurleysoftware.com> Cc: Rob Herring <robh@kernel.org> Cc: linux-kernel@vger.kernel.org Cc: Markos Chandras <markos.chandras@imgtec.com> Patchwork: https://patchwork.linux-mips.org/patch/11223/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
313 lines
8 KiB
C
313 lines
8 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* PROM library initialisation code.
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*
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* Copyright (C) 1999,2000,2004,2005,2012 MIPS Technologies, Inc.
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* All rights reserved.
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* Authors: Carsten Langgaard <carstenl@mips.com>
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* Maciej W. Rozycki <macro@mips.com>
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* Steven J. Hill <sjhill@mips.com>
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*/
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#include <linux/init.h>
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#include <linux/string.h>
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#include <linux/kernel.h>
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#include <linux/serial_core.h>
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#include <asm/cacheflush.h>
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#include <asm/smp-ops.h>
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#include <asm/traps.h>
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#include <asm/fw/fw.h>
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#include <asm/mips-cm.h>
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#include <asm/mips-cpc.h>
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#include <asm/mips-boards/generic.h>
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#include <asm/mips-boards/malta.h>
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static int mips_revision_corid;
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int mips_revision_sconid;
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/* Bonito64 system controller register base. */
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unsigned long _pcictrl_bonito;
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unsigned long _pcictrl_bonito_pcicfg;
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/* GT64120 system controller register base */
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unsigned long _pcictrl_gt64120;
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/* MIPS System controller register base */
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unsigned long _pcictrl_msc;
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#ifdef CONFIG_SERIAL_8250_CONSOLE
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static void __init console_config(void)
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{
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char console_string[40];
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int baud = 0;
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char parity = '\0', bits = '\0', flow = '\0';
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char *s;
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s = fw_getenv("modetty0");
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if (s) {
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while (*s >= '0' && *s <= '9')
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baud = baud*10 + *s++ - '0';
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if (*s == ',')
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s++;
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if (*s)
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parity = *s++;
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if (*s == ',')
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s++;
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if (*s)
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bits = *s++;
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if (*s == ',')
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s++;
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if (*s == 'h')
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flow = 'r';
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}
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if (baud == 0)
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baud = 38400;
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if (parity != 'n' && parity != 'o' && parity != 'e')
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parity = 'n';
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if (bits != '7' && bits != '8')
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bits = '8';
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if (flow == '\0')
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flow = 'r';
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if ((strstr(fw_getcmdline(), "earlycon=")) == NULL) {
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sprintf(console_string, "uart8250,io,0x3f8,%d%c%c", baud,
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parity, bits);
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setup_earlycon(console_string);
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}
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if ((strstr(fw_getcmdline(), "console=")) == NULL) {
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sprintf(console_string, " console=ttyS0,%d%c%c%c", baud,
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parity, bits, flow);
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strcat(fw_getcmdline(), console_string);
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pr_info("Config serial console:%s\n", console_string);
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}
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}
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#endif
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static void __init mips_nmi_setup(void)
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{
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void *base;
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extern char except_vec_nmi;
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base = cpu_has_veic ?
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(void *)(CAC_BASE + 0xa80) :
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(void *)(CAC_BASE + 0x380);
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memcpy(base, &except_vec_nmi, 0x80);
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flush_icache_range((unsigned long)base, (unsigned long)base + 0x80);
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}
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static void __init mips_ejtag_setup(void)
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{
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void *base;
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extern char except_vec_ejtag_debug;
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base = cpu_has_veic ?
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(void *)(CAC_BASE + 0xa00) :
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(void *)(CAC_BASE + 0x300);
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memcpy(base, &except_vec_ejtag_debug, 0x80);
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flush_icache_range((unsigned long)base, (unsigned long)base + 0x80);
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}
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phys_addr_t mips_cpc_default_phys_base(void)
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{
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return CPC_BASE_ADDR;
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}
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void __init prom_init(void)
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{
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mips_display_message("LINUX");
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/*
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* early setup of _pcictrl_bonito so that we can determine
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* the system controller on a CORE_EMUL board
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*/
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_pcictrl_bonito = (unsigned long)ioremap(BONITO_REG_BASE, BONITO_REG_SIZE);
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mips_revision_corid = MIPS_REVISION_CORID;
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if (mips_revision_corid == MIPS_REVISION_CORID_CORE_EMUL) {
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if (BONITO_PCIDID == 0x0001df53 ||
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BONITO_PCIDID == 0x0003df53)
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mips_revision_corid = MIPS_REVISION_CORID_CORE_EMUL_BON;
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else
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mips_revision_corid = MIPS_REVISION_CORID_CORE_EMUL_MSC;
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}
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mips_revision_sconid = MIPS_REVISION_SCONID;
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if (mips_revision_sconid == MIPS_REVISION_SCON_OTHER) {
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switch (mips_revision_corid) {
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case MIPS_REVISION_CORID_QED_RM5261:
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case MIPS_REVISION_CORID_CORE_LV:
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case MIPS_REVISION_CORID_CORE_FPGA:
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case MIPS_REVISION_CORID_CORE_FPGAR2:
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mips_revision_sconid = MIPS_REVISION_SCON_GT64120;
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break;
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case MIPS_REVISION_CORID_CORE_EMUL_BON:
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case MIPS_REVISION_CORID_BONITO64:
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case MIPS_REVISION_CORID_CORE_20K:
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mips_revision_sconid = MIPS_REVISION_SCON_BONITO;
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break;
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case MIPS_REVISION_CORID_CORE_MSC:
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case MIPS_REVISION_CORID_CORE_FPGA2:
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case MIPS_REVISION_CORID_CORE_24K:
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/*
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* SOCit/ROCit support is essentially identical
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* but make an attempt to distinguish them
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*/
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mips_revision_sconid = MIPS_REVISION_SCON_SOCIT;
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break;
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case MIPS_REVISION_CORID_CORE_FPGA3:
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case MIPS_REVISION_CORID_CORE_FPGA4:
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case MIPS_REVISION_CORID_CORE_FPGA5:
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case MIPS_REVISION_CORID_CORE_EMUL_MSC:
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default:
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/* See above */
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mips_revision_sconid = MIPS_REVISION_SCON_ROCIT;
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break;
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}
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}
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switch (mips_revision_sconid) {
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u32 start, map, mask, data;
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case MIPS_REVISION_SCON_GT64120:
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/*
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* Setup the North bridge to do Master byte-lane swapping
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* when running in bigendian.
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*/
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_pcictrl_gt64120 = (unsigned long)ioremap(MIPS_GT_BASE, 0x2000);
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#ifdef CONFIG_CPU_LITTLE_ENDIAN
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GT_WRITE(GT_PCI0_CMD_OFS, GT_PCI0_CMD_MBYTESWAP_BIT |
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GT_PCI0_CMD_SBYTESWAP_BIT);
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#else
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GT_WRITE(GT_PCI0_CMD_OFS, 0);
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#endif
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/* Fix up PCI I/O mapping if necessary (for Atlas). */
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start = GT_READ(GT_PCI0IOLD_OFS);
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map = GT_READ(GT_PCI0IOREMAP_OFS);
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if ((start & map) != 0) {
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map &= ~start;
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GT_WRITE(GT_PCI0IOREMAP_OFS, map);
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}
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set_io_port_base(MALTA_GT_PORT_BASE);
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break;
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case MIPS_REVISION_SCON_BONITO:
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_pcictrl_bonito_pcicfg = (unsigned long)ioremap(BONITO_PCICFG_BASE, BONITO_PCICFG_SIZE);
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/*
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* Disable Bonito IOBC.
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*/
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BONITO_PCIMEMBASECFG = BONITO_PCIMEMBASECFG &
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~(BONITO_PCIMEMBASECFG_MEMBASE0_CACHED |
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BONITO_PCIMEMBASECFG_MEMBASE1_CACHED);
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/*
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* Setup the North bridge to do Master byte-lane swapping
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* when running in bigendian.
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*/
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#ifdef CONFIG_CPU_LITTLE_ENDIAN
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BONITO_BONGENCFG = BONITO_BONGENCFG &
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~(BONITO_BONGENCFG_MSTRBYTESWAP |
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BONITO_BONGENCFG_BYTESWAP);
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#else
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BONITO_BONGENCFG = BONITO_BONGENCFG |
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BONITO_BONGENCFG_MSTRBYTESWAP |
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BONITO_BONGENCFG_BYTESWAP;
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#endif
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set_io_port_base(MALTA_BONITO_PORT_BASE);
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break;
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case MIPS_REVISION_SCON_SOCIT:
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case MIPS_REVISION_SCON_ROCIT:
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_pcictrl_msc = (unsigned long)ioremap(MIPS_MSC01_PCI_REG_BASE, 0x2000);
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mips_pci_controller:
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mb();
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MSC_READ(MSC01_PCI_CFG, data);
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MSC_WRITE(MSC01_PCI_CFG, data & ~MSC01_PCI_CFG_EN_BIT);
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wmb();
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/* Fix up lane swapping. */
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#ifdef CONFIG_CPU_LITTLE_ENDIAN
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MSC_WRITE(MSC01_PCI_SWAP, MSC01_PCI_SWAP_NOSWAP);
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#else
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MSC_WRITE(MSC01_PCI_SWAP,
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MSC01_PCI_SWAP_BYTESWAP << MSC01_PCI_SWAP_IO_SHF |
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MSC01_PCI_SWAP_BYTESWAP << MSC01_PCI_SWAP_MEM_SHF |
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MSC01_PCI_SWAP_BYTESWAP << MSC01_PCI_SWAP_BAR0_SHF);
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#endif
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#ifndef CONFIG_EVA
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/* Fix up target memory mapping. */
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MSC_READ(MSC01_PCI_BAR0, mask);
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MSC_WRITE(MSC01_PCI_P2SCMSKL, mask & MSC01_PCI_BAR0_SIZE_MSK);
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#else
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/*
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* Setup the Malta max (2GB) memory for PCI DMA in host bridge
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* in transparent addressing mode, starting from 0x80000000.
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*/
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mask = PHYS_OFFSET | (1<<3);
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MSC_WRITE(MSC01_PCI_BAR0, mask);
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mask = PHYS_OFFSET;
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MSC_WRITE(MSC01_PCI_HEAD4, mask);
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MSC_WRITE(MSC01_PCI_P2SCMSKL, mask);
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MSC_WRITE(MSC01_PCI_P2SCMAPL, mask);
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#endif
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/* Don't handle target retries indefinitely. */
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if ((data & MSC01_PCI_CFG_MAXRTRY_MSK) ==
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MSC01_PCI_CFG_MAXRTRY_MSK)
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data = (data & ~(MSC01_PCI_CFG_MAXRTRY_MSK <<
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MSC01_PCI_CFG_MAXRTRY_SHF)) |
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((MSC01_PCI_CFG_MAXRTRY_MSK - 1) <<
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MSC01_PCI_CFG_MAXRTRY_SHF);
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wmb();
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MSC_WRITE(MSC01_PCI_CFG, data);
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mb();
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set_io_port_base(MALTA_MSC_PORT_BASE);
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break;
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case MIPS_REVISION_SCON_SOCITSC:
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case MIPS_REVISION_SCON_SOCITSCP:
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_pcictrl_msc = (unsigned long)ioremap(MIPS_SOCITSC_PCI_REG_BASE, 0x2000);
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goto mips_pci_controller;
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default:
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/* Unknown system controller */
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mips_display_message("SC Error");
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while (1); /* We die here... */
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}
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board_nmi_handler_setup = mips_nmi_setup;
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board_ejtag_handler_setup = mips_ejtag_setup;
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fw_init_cmdline();
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fw_meminit();
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#ifdef CONFIG_SERIAL_8250_CONSOLE
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console_config();
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#endif
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/* Early detection of CMP support */
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mips_cm_probe();
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mips_cpc_probe();
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if (!register_cps_smp_ops())
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return;
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if (!register_cmp_smp_ops())
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return;
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if (!register_vsmp_smp_ops())
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return;
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register_up_smp_ops();
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}
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void platform_early_l2_init(void)
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{
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/* L2 configuration lives in the CM3 */
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if (mips_cm_revision() >= CM_REV_CM3)
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mips_cm_probe();
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}
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