2 * Copyright 2003-2011 NetLogic Microsystems, Inc. (NetLogic). All rights
5 * This software is available to you under a choice of one of two
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7 * General Public License (GPL) Version 2, available from the file
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35 #include <linux/init.h>
38 #include <asm/asm-offsets.h>
39 #include <asm/regdef.h>
40 #include <asm/mipsregs.h>
41 #include <asm/stackframe.h>
42 #include <asm/asmmacro.h>
43 #include <asm/addrspace.h>
45 #include <asm/netlogic/common.h>
47 #include <asm/netlogic/xlp-hal/iomap.h>
48 #include <asm/netlogic/xlp-hal/xlp.h>
49 #include <asm/netlogic/xlp-hal/sys.h>
50 #include <asm/netlogic/xlp-hal/cpucontrol.h>
53 #define SYS_CPU_COHERENT_BASE(node) CKSEG1ADDR(XLP_DEFAULT_IO_BASE) + \
54 XLP_IO_SYS_OFFSET(node) + XLP_IO_PCI_HDRSZ + \
55 SYS_CPU_NONCOHERENT_MODE * 4
57 #define XLP_AX_WORKAROUND /* enable Ax silicon workarounds */
59 /* Enable XLP features and workarounds in the LSU */
64 lui t2, 0x4080 /* Enable Unaligned Access, L2HPE */
66 #ifdef XLP_AX_WORKAROUND
67 li t2, ~0xe /* S1RCM */
72 #ifdef XLP_AX_WORKAROUND
73 li t0, SCHED_DEFEATURE
74 lui t1, 0x0100 /* Disable BRU accepting ALU ops */
80 * This is the code that will be copied to the reset entry point for
81 * XLR and XLP. The XLP cores start here when they are woken up. This
82 * is also the NMI entry point.
84 .macro xlp_flush_l1_dcache
85 li t0, LSU_DEBUG_DATA0
88 li t3, 0x1000 /* loop count */
92 ori v1, v0, 0x3 /* way0 | write_enable | write_active */
96 andi v1, 0x1 /* wait for write_active == 0 */
100 ori v1, v0, 0x7 /* way1 | write_enable | write_active */
104 andi v1, 0x1 /* wait for write_active == 0 */
113 * The cores can come start when they are woken up. This is also the NMI
114 * entry, so check that first.
116 * The data corresponding to reset/NMI is stored at RESET_DATA_PHYS
117 * location, this will have the thread mask (used when core is woken up)
118 * and the current NMI handler in case we reached here for an NMI.
120 * When a core or thread is newly woken up, it loops in a 'wait'. When
121 * the CPU really needs waking up, we send an NMI to it, with the NMI
122 * handler set to prom_boot_secondary_cpus
127 .set arch=xlr /* for mfcr/mtcr, XLR is sufficient */
129 FEXPORT(nlm_reset_entry)
135 beqz k1, 1f /* go to real reset entry */
137 li k1, CKSEG1ADDR(RESET_DATA_PHYS) /* NMI */
138 ld k0, BOOT_NMI_HANDLER(k1)
142 1: /* Entry point on core wakeup */
143 mfc0 t0, CP0_EBASE, 1
144 mfc0 t1, CP0_EBASE, 1
146 andi t1, 0x3 /* t1 <- node */
148 mul t3, t2, t1 /* t3 = node * 0x40000 */
150 and t0, t0, 0x7 /* t0 <- core */
153 nor t0, t0, zero /* t0 <- ~(1 << core) */
154 li t2, SYS_CPU_COHERENT_BASE(0)
155 add t2, t2, t3 /* t2 <- SYS offset for node */
160 /* read back to ensure complete */
164 /* Configure LSU on Non-0 Cores. */
169 * Wake up sibling threads from the initial thread in
172 EXPORT(nlm_boot_siblings)
173 /* core L1D flush before enable threads */
175 /* Enable hw threads by writing to MAP_THREADMODE of the core */
176 li t0, CKSEG1ADDR(RESET_DATA_PHYS)
177 lw t1, BOOT_THREAD_MODE(t0) /* t1 <- thread mode */
178 li t0, ((CPU_BLOCKID_MAP << 8) | MAP_THREADMODE)
184 * The new hardware thread starts at the next instruction
185 * For all the cases other than core 0 thread 0, we will
186 * jump to the secondary wait function.
188 mfc0 v0, CP0_EBASE, 1
189 andi v0, 0x7f /* v0 <- node/core */
191 /* Init MMU in the first thread after changing THREAD_MODE
192 * register (Ax Errata?)
194 andi v1, v0, 0x3 /* v1 <- thread id */
203 2: beqz v0, 4f /* boot cpu (cpuid == 0)? */
206 /* setup status reg */
213 PTR_LA t1, nlm_cpu_ready
218 /* Wait until NMI hits */
224 * For the boot CPU, we have to restore registers and
227 4: dmfc0 t0, $4, 2 /* restore SP from UserLocal */
229 dmtc0 t1, $4, 2 /* restore SP from UserLocal */
230 PTR_SUBU sp, t0, PT_SIZE
234 EXPORT(nlm_reset_entry_end)
236 FEXPORT(xlp_boot_core0_siblings) /* "Master" cpu starts from here */
238 dmtc0 sp, $4, 2 /* SP saved in UserLocal */
241 /* find the location to which nlm_boot_siblings was relocated */
242 li t0, CKSEG1ADDR(RESET_VEC_PHYS)
243 dla t1, nlm_reset_entry
244 dla t2, nlm_boot_siblings
253 NESTED(nlm_boot_secondary_cpus, 16, sp)
254 /* Initialize CP0 Status */
260 PTR_LA t1, nlm_next_sp
262 PTR_LA t1, nlm_next_gp
265 /* a0 has the processor id */
266 PTR_LA t0, nlm_early_init_secondary
270 PTR_LA t0, smp_bootstrap
273 END(nlm_boot_secondary_cpus)
277 * In case of RMIboot bootloader which is used on XLR boards, the CPUs
278 * be already woken up and waiting in bootloader code.
279 * This will get them out of the bootloader code and into linux. Needed
280 * because the bootloader area will be taken and initialized by linux.
283 NESTED(nlm_rmiboot_preboot, 16, sp)
284 mfc0 t0, $15, 1 /* read ebase */
285 andi t0, 0x1f /* t0 has the processor_id() */
286 andi t2, t0, 0x3 /* thread num */
287 sll t0, 2 /* offset in cpu array */
289 PTR_LA t1, nlm_cpu_ready /* mark CPU ready */
294 bnez t2, 1f /* skip thread programming */
295 nop /* for thread id != 0 */
298 * XLR MMU setup only for first thread in core
302 li t2, 6 /* XLR thread mode mask */
304 and t2, t1, t2 /* t2 - current thread mode */
305 li v0, CKSEG1ADDR(RESET_DATA_PHYS)
306 lw v1, BOOT_THREAD_MODE(v0) /* v1 - new thread mode */
308 beq v1, t2, 1f /* same as request value */
309 nop /* nothing to do */
311 and t2, t1, t3 /* mask out old thread mode */
312 or t1, t2, v1 /* put in new value */
313 mtcr t1, t0 /* update core control */
318 END(nlm_rmiboot_preboot)