diff options
Diffstat (limited to 'arch/mips/netlogic/xlp/wakeup.c')
| -rw-r--r-- | arch/mips/netlogic/xlp/wakeup.c | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/arch/mips/netlogic/xlp/wakeup.c b/arch/mips/netlogic/xlp/wakeup.c new file mode 100644 index 00000000000..44d923ff384 --- /dev/null +++ b/arch/mips/netlogic/xlp/wakeup.c @@ -0,0 +1,102 @@ +/* + * Copyright 2003-2011 NetLogic Microsystems, Inc. (NetLogic). All rights + * reserved. + * + * This software is available to you under a choice of one of two + * licenses. You may choose to be licensed under the terms of the GNU + * General Public License (GPL) Version 2, available from the file + * COPYING in the main directory of this source tree, or the NetLogic + * license below: + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * THIS SOFTWARE IS PROVIDED BY NETLOGIC ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED + * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL NETLOGIC OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR + * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, + * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE + * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN + * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/threads.h> + +#include <asm/asm.h> +#include <asm/asm-offsets.h> +#include <asm/mipsregs.h> +#include <asm/addrspace.h> +#include <asm/string.h> + +#include <asm/netlogic/haldefs.h> +#include <asm/netlogic/common.h> +#include <asm/netlogic/mips-extns.h> + +#include <asm/netlogic/xlp-hal/iomap.h> +#include <asm/netlogic/xlp-hal/pic.h> +#include <asm/netlogic/xlp-hal/xlp.h> +#include <asm/netlogic/xlp-hal/sys.h> + +static void xlp_enable_secondary_cores(void) +{ + uint32_t core, value, coremask, syscoremask; + int count; + + /* read cores in reset from SYS block */ + syscoremask = nlm_read_sys_reg(nlm_sys_base, SYS_CPU_RESET); + + /* update user specified */ + nlm_coremask = nlm_coremask & (syscoremask | 1); + + for (core = 1; core < 8; core++) { + coremask = 1 << core; + if ((nlm_coremask & coremask) == 0) + continue; + + /* Enable CPU clock */ + value = nlm_read_sys_reg(nlm_sys_base, SYS_CORE_DFS_DIS_CTRL); + value &= ~coremask; + nlm_write_sys_reg(nlm_sys_base, SYS_CORE_DFS_DIS_CTRL, value); + + /* Remove CPU Reset */ + value = nlm_read_sys_reg(nlm_sys_base, SYS_CPU_RESET); + value &= ~coremask; + nlm_write_sys_reg(nlm_sys_base, SYS_CPU_RESET, value); + + /* Poll for CPU to mark itself coherent */ + count = 100000; + do { + value = nlm_read_sys_reg(nlm_sys_base, + SYS_CPU_NONCOHERENT_MODE); + } while ((value & coremask) != 0 && count-- > 0); + + if (count == 0) + pr_err("Failed to enable core %d\n", core); + } +} + +void xlp_wakeup_secondary_cpus(void) +{ + /* + * In case of u-boot, the secondaries are in reset + * first wakeup core 0 threads + */ + xlp_boot_core0_siblings(); + + /* now get other cores out of reset */ + xlp_enable_secondary_cores(); +} |