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37 #include <asm/asm-offsets.h>
39 #include <asm/cacheops.h>
40 #include <asm/regdef.h>
41 #include <asm/mipsregs.h>
42 #include <asm/stackframe.h>
43 #include <asm/asmmacro.h>
44 #include <asm/addrspace.h>
46 #include <asm/netlogic/common.h>
48 #include <asm/netlogic/xlp-hal/iomap.h>
49 #include <asm/netlogic/xlp-hal/xlp.h>
50 #include <asm/netlogic/xlp-hal/sys.h>
51 #include <asm/netlogic/xlp-hal/cpucontrol.h>
53 #define SYS_CPU_COHERENT_BASE CKSEG1ADDR(XLP_DEFAULT_IO_BASE) + \
54 XLP_IO_SYS_OFFSET(0) + XLP_IO_PCI_HDRSZ + \
55 SYS_CPU_NONCOHERENT_MODE * 4
57 /* Enable XLP features and workarounds in the LSU */
62 lui t2, 0x4080 /* Enable Unaligned Access, L2HPE */
68 ori t1, 0x1000 /* Enable Icache partitioning */
71 li t0, SCHED_DEFEATURE
72 lui t1, 0x0100 /* Disable BRU accepting ALU ops */
77 * Allow access to physical mem >64G by enabling ELPA in PAGEGRAIN
78 * register. This is needed before going to C code since the SP can
79 * in this region. Called from all HW threads.
81 .macro xlp_early_mmu_init
82 mfc0 t0, CP0_PAGEMASK, 1
83 li t1, (1 << 29) /* ELPA bit */
85 mtc0 t0, CP0_PAGEMASK, 1
89 * L1D cache has to be flushed before enabling threads in XLP.
90 * On XLP8xx/XLP3xx, we do a low level flush using processor control
91 * registers. On XLPII CPUs, usual cache instructions work.
93 .macro xlp_flush_l1_dcache
95 andi t0, t0, PRID_IMP_MASK
100 /* XLP8xx low level cache flush */
101 li t0, LSU_DEBUG_DATA0
102 li t1, LSU_DEBUG_ADDR
104 li t3, 0x1000 /* loop count */
108 ori v1, v0, 0x3 /* way0 | write_enable | write_active */
112 andi v1, 0x1 /* wait for write_active == 0 */
116 ori v1, v0, 0x7 /* way1 | write_enable | write_active */
120 andi v1, 0x1 /* wait for write_active == 0 */
129 /* XLPII CPUs, Invalidate all 64k of L1 D-cache */
133 16: cache Index_Writeback_Inv_D, 0(t0)
141 * nlm_reset_entry will be copied to the reset entry point for
142 * XLR and XLP. The XLP cores start here when they are woken up. This
143 * is also the NMI entry point.
145 * We use scratch reg 6/7 to save k0/k1 and check for NMI first.
147 * The data corresponding to reset/NMI is stored at RESET_DATA_PHYS
148 * location, this will have the thread mask (used when core is woken up)
149 * and the current NMI handler in case we reached here for an NMI.
151 * When a core or thread is newly woken up, it marks itself ready and
152 * loops in a 'wait'. When the CPU really needs waking up, we send an NMI
153 * IPI to it, with the NMI handler set to prom_boot_secondary_cpus
157 .set arch=xlr /* for mfcr/mtcr, XLR is sufficient */
159 FEXPORT(nlm_reset_entry)
165 beqz k1, 1f /* go to real reset entry */
167 li k1, CKSEG1ADDR(RESET_DATA_PHYS) /* NMI */
168 ld k0, BOOT_NMI_HANDLER(k1)
172 1: /* Entry point on core wakeup */
173 mfc0 t0, CP0_PRID /* processor ID */
174 andi t0, PRID_IMP_MASK
175 li t1, 0x1500 /* XLP 9xx */
176 beq t0, t1, 2f /* does not need to set coherent */
179 li t1, 0x1300 /* XLP 5xx */
180 beq t0, t1, 2f /* does not need to set coherent */
183 /* set bit in SYS coherent register for the core */
187 andi t1, 0x3 /* t1 <- node */
189 mul t3, t2, t1 /* t3 = node * 0x40000 */
191 and t0, t0, 0x7 /* t0 <- core */
194 nor t0, t0, zero /* t0 <- ~(1 << core) */
195 li t2, SYS_CPU_COHERENT_BASE
196 add t2, t2, t3 /* t2 <- SYS offset for node */
201 /* read back to ensure complete */
206 /* Configure LSU on Non-0 Cores. */
211 * Wake up sibling threads from the initial thread in a core.
213 EXPORT(nlm_boot_siblings)
214 /* core L1D flush before enable threads */
216 /* save ra and sp, will be used later (only for boot cpu) */
219 /* Enable hw threads by writing to MAP_THREADMODE of the core */
220 li t0, CKSEG1ADDR(RESET_DATA_PHYS)
221 lw t1, BOOT_THREAD_MODE(t0) /* t1 <- thread mode */
222 li t0, ((CPU_BLOCKID_MAP << 8) | MAP_THREADMODE)
228 * The new hardware thread starts at the next instruction
229 * For all the cases other than core 0 thread 0, we will
230 * jump to the secondary wait function.
232 * NOTE: All GPR contents are lost after the mtcr above!
235 andi v0, 0x3ff /* v0 <- node/core */
238 * Errata: to avoid potential live lock, setup IFU_BRUB_RESERVE
239 * when running 4 threads per core
241 andi v1, v0, 0x3 /* v1 <- thread id */
245 /* thread 0 of each core. */
246 li t0, CKSEG1ADDR(RESET_DATA_PHYS)
247 lw t1, BOOT_THREAD_MODE(t0) /* t1 <- thread mode */
248 subu t1, 0x3 /* 4-thread per core mode? */
252 li t0, IFU_BRUB_RESERVE
257 beqz v0, 4f /* boot cpu (cpuid == 0)? */
260 /* setup status reg */
270 li t3, CKSEG1ADDR(RESET_DATA_PHYS)
271 ADDIU t1, t3, BOOT_CPU_READY
276 /* Wait until NMI hits */
282 * For the boot CPU, we have to restore ra and sp and return, rest
283 * of the registers will be restored by the caller
290 EXPORT(nlm_reset_entry_end)
292 LEAF(nlm_init_boot_cpu)
293 #ifdef CONFIG_CPU_XLP
299 END(nlm_init_boot_cpu)