/* * Copyright 2003-2013 Broadcom Corporation. * 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 Broadcom * 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 BROADCOM ``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 BROADCOM 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #define CP0_EBASE $15 #define SYS_CPU_COHERENT_BASE CKSEG1ADDR(XLP_DEFAULT_IO_BASE) + \ XLP_IO_SYS_OFFSET(0) + XLP_IO_PCI_HDRSZ + \ SYS_CPU_NONCOHERENT_MODE * 4 /* Enable XLP features and workarounds in the LSU */ .macro xlp_config_lsu li t0, LSU_DEFEATURE mfcr t1, t0 lui t2, 0xc080 /* SUE, Enable Unaligned Access, L2HPE */ or t1, t1, t2 mtcr t1, t0 li t0, ICU_DEFEATURE mfcr t1, t0 ori t1, 0x1000 /* Enable Icache partitioning */ mtcr t1, t0 li t0, SCHED_DEFEATURE lui t1, 0x0100 /* Disable BRU accepting ALU ops */ mtcr t1, t0 .endm /* * Allow access to physical mem >64G by enabling ELPA in PAGEGRAIN * register. This is needed before going to C code since the SP can * in this region. Called from all HW threads. */ .macro xlp_early_mmu_init mfc0 t0, CP0_PAGEMASK, 1 li t1, (1 << 29) /* ELPA bit */ or t0, t1 mtc0 t0, CP0_PAGEMASK, 1 .endm /* * L1D cache has to be flushed before enabling threads in XLP. * On XLP8xx/XLP3xx, we do a low level flush using processor control * registers. On XLPII CPUs, usual cache instructions work. */ .macro xlp_flush_l1_dcache mfc0 t0, CP0_EBASE, 0 andi t0, t0, PRID_IMP_MASK slt t1, t0, 0x1200 beqz t1, 15f nop /* XLP8xx low level cache flush */ li t0, LSU_DEBUG_DATA0 li t1, LSU_DEBUG_ADDR li t2, 0 /* index */ li t3, 0x1000 /* loop count */ 11: sll v0, t2, 5 mtcr zero, t0 ori v1, v0, 0x3 /* way0 | write_enable | write_active */ mtcr v1, t1 12: mfcr v1, t1 andi v1, 0x1 /* wait for write_active == 0 */ bnez v1, 12b nop mtcr zero, t0 ori v1, v0, 0x7 /* way1 | write_enable | write_active */ mtcr v1, t1 13: mfcr v1, t1 andi v1, 0x1 /* wait for write_active == 0 */ bnez v1, 13b nop addi t2, 1 bne t3, t2, 11b nop b 17f nop /* XLPII CPUs, Invalidate all 64k of L1 D-cache */ 15: li t0, 0x80000000 li t1, 0x80010000 16: cache Index_Writeback_Inv_D, 0(t0) addiu t0, t0, 32 bne t0, t1, 16b nop 17: .endm /* * nlm_reset_entry will be copied to the reset entry point for * XLR and XLP. The XLP cores start here when they are woken up. This * is also the NMI entry point. * * We use scratch reg 6/7 to save k0/k1 and check for NMI first. * * The data corresponding to reset/NMI is stored at RESET_DATA_PHYS * location, this will have the thread mask (used when core is woken up) * and the current NMI handler in case we reached here for an NMI. * * When a core or thread is newly woken up, it marks itself ready and * loops in a 'wait'. When the CPU really needs waking up, we send an NMI * IPI to it, with the NMI handler set to prom_boot_secondary_cpus */ .set noreorder .set noat .set arch=xlr /* for mfcr/mtcr, XLR is sufficient */ FEXPORT(nlm_reset_entry) dmtc0 k0, $22, 6 dmtc0 k1, $22, 7 mfc0 k0, CP0_STATUS li k1, 0x80000 and k1, k0, k1 beqz k1, 1f /* go to real reset entry */ nop li k1, CKSEG1ADDR(RESET_DATA_PHYS) /* NMI */ ld k0, BOOT_NMI_HANDLER(k1) jr k0 nop 1: /* Entry point on core wakeup */ mfc0 t0, CP0_EBASE, 0 /* processor ID */ andi t0, PRID_IMP_MASK li t1, 0x1500 /* XLP 9xx */ beq t0, t1, 2f /* does not need to set coherent */ nop /* set bit in SYS coherent register for the core */ mfc0 t0, CP0_EBASE, 1 mfc0 t1, CP0_EBASE, 1 srl t1, 5 andi t1, 0x3 /* t1 <- node */ li t2, 0x40000 mul t3, t2, t1 /* t3 = node * 0x40000 */ srl t0, t0, 2 and t0, t0, 0x7 /* t0 <- core */ li t1, 0x1 sll t0, t1, t0 nor t0, t0, zero /* t0 <- ~(1 << core) */ li t2, SYS_CPU_COHERENT_BASE add t2, t2, t3 /* t2 <- SYS offset for node */ lw t1, 0(t2) and t1, t1, t0 sw t1, 0(t2) /* read back to ensure complete */ lw t1, 0(t2) sync 2: /* Configure LSU on Non-0 Cores. */ xlp_config_lsu /* FALL THROUGH */ /* * Wake up sibling threads from the initial thread in a core. */ EXPORT(nlm_boot_siblings) /* core L1D flush before enable threads */ xlp_flush_l1_dcache /* save ra and sp, will be used later (only for boot cpu) */ dmtc0 ra, $22, 6 dmtc0 sp, $22, 7 /* Enable hw threads by writing to MAP_THREADMODE of the core */ li t0, CKSEG1ADDR(RESET_DATA_PHYS) lw t1, BOOT_THREAD_MODE(t0) /* t1 <- thread mode */ li t0, ((CPU_BLOCKID_MAP << 8) | MAP_THREADMODE) mfcr t2, t0 or t2, t2, t1 mtcr t2, t0 /* * The new hardware thread starts at the next instruction * For all the cases other than core 0 thread 0, we will * jump to the secondary wait function. * NOTE: All GPR contents are lost after the mtcr above! */ mfc0 v0, CP0_EBASE, 1 andi v0, 0x3ff /* v0 <- node/core */ beqz v0, 4f /* boot cpu (cpuid == 0)? */ nop /* setup status reg */ move t1, zero #ifdef CONFIG_64BIT ori t1, ST0_KX #endif mtc0 t1, CP0_STATUS xlp_early_mmu_init /* mark CPU ready */ li t3, CKSEG1ADDR(RESET_DATA_PHYS) ADDIU t1, t3, BOOT_CPU_READY sll v1, v0, 2 PTR_ADDU t1, v1 li t2, 1 sw t2, 0(t1) /* Wait until NMI hits */ 3: wait b 3b nop /* * For the boot CPU, we have to restore ra and sp and return, rest * of the registers will be restored by the caller */ 4: dmfc0 ra, $22, 6 dmfc0 sp, $22, 7 jr ra nop EXPORT(nlm_reset_entry_end) LEAF(nlm_init_boot_cpu) #ifdef CONFIG_CPU_XLP xlp_config_lsu xlp_early_mmu_init #endif jr ra nop END(nlm_init_boot_cpu)