MIPS: Netlogic: Merge some of XLR/XLP wakup code

Create a common NMI and reset handler in smpboot.S and use this for
both XLR and XLP.  In the earlier code, the woken up CPUs would
busy wait until released, switch this to wakeup by NMI.

The initial wakeup code or XLR and XLP are differ since they are
started from different bootloaders (XLP from u-boot and XLR from
netlogic bootloader). But in both platforms the woken up CPUs wait
and are released by sending an NMI.

Add support for starting XLR and XLP in 1/2/4 threads per core.

Signed-off-by: Jayachandran C <jayachandranc@netlogicmicro.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2970/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

4 files changed, 28 insertions, 288 deletions

diff --git a/arch/mips/netlogic/xlp/Makefile b/arch/mips/netlogic/xlp/Makefile
index 1940d1c946d0..b93ed83474ec 100644
--- a/arch/mips/netlogic/xlp/Makefile
+++ b/arch/mips/netlogic/xlp/Makefile
@@ -1,2 +1,2 @@
 obj-y				+= setup.o platform.o nlm_hal.o
-obj-$(CONFIG_SMP)		+= smpboot.o wakeup.o
+obj-$(CONFIG_SMP)		+= wakeup.o
diff --git a/arch/mips/netlogic/xlp/setup.c b/arch/mips/netlogic/xlp/setup.c
index f40a0e73580f..acb677a1227c 100644
--- a/arch/mips/netlogic/xlp/setup.c
+++ b/arch/mips/netlogic/xlp/setup.c
@@ -51,6 +51,10 @@
 
 unsigned long nlm_common_ebase = 0x0;
 
+/* default to uniprocessor */
+uint32_t nlm_coremask = 1, nlm_cpumask  = 1;
+int  nlm_threads_per_core = 1;
+
 static void nlm_linux_exit(void)
 {
 	nlm_write_sys_reg(nlm_sys_base, SYS_CHIP_RESET, 1);
diff --git a/arch/mips/netlogic/xlp/smpboot.S b/arch/mips/netlogic/xlp/smpboot.S
deleted file mode 100644
index 7dd323234d70..000000000000
--- a/arch/mips/netlogic/xlp/smpboot.S
+++ /dev/null
@@ -1,217 +0,0 @@
-/*
- * 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 <asm/asm.h>
-#include <asm/asm-offsets.h>
-#include <asm/regdef.h>
-#include <asm/mipsregs.h>
-#include <asm/stackframe.h>
-#include <asm/asmmacro.h>
-#include <asm/addrspace.h>
-
-#include <asm/netlogic/xlp-hal/iomap.h>
-#include <asm/netlogic/xlp-hal/xlp.h>
-#include <asm/netlogic/xlp-hal/sys.h>
-#include <asm/netlogic/xlp-hal/cpucontrol.h>
-
-#define	CP0_EBASE	$15
-#define SYS_CPU_COHERENT_BASE(node)	CKSEG1ADDR(XLP_DEFAULT_IO_BASE) + \
-			XLP_IO_SYS_OFFSET(node) + XLP_IO_PCI_HDRSZ + \
-			SYS_CPU_NONCOHERENT_MODE * 4
-
-.macro __config_lsu
-	li      t0, LSU_DEFEATURE
-	mfcr    t1, t0
-
-	lui     t2, 0x4080  /* Enable Unaligned Access, L2HPE */
-	or      t1, t1, t2
-	li	t2, ~0xe    /* S1RCM */
-	and	t1, t1, t2
-	mtcr    t1, t0
-
-	li      t0, SCHED_DEFEATURE
-	lui     t1, 0x0100  /* Experimental: Disable BRU accepting ALU ops */
-	mtcr    t1, t0
-.endm
-
-	.set	noreorder
-	.set	arch=xlr	/* for mfcr/mtcr, XLR is sufficient */
-
-	__CPUINIT
-EXPORT(nlm_reset_entry)
-	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(0)
-	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
-
-	/* Configure LSU on Non-0 Cores. */
-	__config_lsu
-
-/*
- * Wake up sibling threads from the initial thread in
- * a core.
- */
-EXPORT(nlm_boot_siblings)
-	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.
-         */
-	mfc0	v0, CP0_EBASE, 1
-	andi	v0, 0x7f		/* v0 <- node/core */
-
-#if 1
-	/* A0 errata - Write MMU_SETUP after changing thread mode register. */
-	andi	v1, v0, 0x3		/* v1 <- thread id */
-	bnez	v1, 2f
-	nop
-
-        li	t0, MMU_SETUP
-        li	t1, 0
-        mtcr	t1, t0
-	ehb
-#endif
-
-2:	beqz	v0, 3f
-	nop
-
-	/* setup status reg */
-	mfc0	t1, CP0_STATUS
-	li	t0, ST0_BEV
-	or	t1, t0
-	xor	t1, t0
-#ifdef CONFIG_64BIT
-	ori	t1, ST0_KX
-#endif
-	mtc0	t1, CP0_STATUS
-
-	/* SETUP TLBs for a mapped kernel here */
-	PTR_LA	t0, prom_pre_boot_secondary_cpus
-	jalr	t0
-	nop
-
-	/*
-	 * For the boot CPU, we have to restore registers and
-	 * return
-	 */
-3:	dmfc0	t0, $4, 2       /* restore SP from UserLocal */
-	li	t1, 0xfadebeef
-	dmtc0	t1, $4, 2       /* restore SP from UserLocal */
-	PTR_SUBU sp, t0, PT_SIZE
-	RESTORE_ALL
-	jr   ra
-	nop
-EXPORT(nlm_reset_entry_end)
-
-EXPORT(nlm_boot_core0_siblings)	/* "Master" (n0c0t0) cpu starts from here */
-	__config_lsu
-	dmtc0   sp, $4, 2		/* SP saved in UserLocal */
-	SAVE_ALL
-	sync
-	/* find the location to which nlm_boot_siblings was relocated */
-	li	t0, CKSEG1ADDR(RESET_VEC_PHYS)
-	dla	t1, nlm_reset_entry
-	dla	t2, nlm_boot_siblings
-	dsubu	t2, t1
-	daddu	t2, t0
-	/* call it */
-	jr	t2
-	nop
-	__FINIT
-
-	__CPUINIT
-NESTED(prom_pre_boot_secondary_cpus, 16, sp)
-	.set	mips64
-	mfc0	a0, CP0_EBASE, 1	/* read ebase */
-	andi	a0, 0x3ff		/* a0 has the processor_id() */
-	sll	t0, a0, 2		/* offset in cpu array */
-
-	PTR_LA	t1, nlm_cpu_ready	/* mark CPU ready */
-	PTR_ADDU t1, t0
-	li	t2, 1
-	sw	t2, 0(t1)
-
-	PTR_LA	t1, nlm_cpu_unblock
-	PTR_ADDU t1, t0
-1:	lw	t2, 0(t1)		/* wait till unblocked */
-	bnez	t2, 2f
-	nop
-	nop
-	nop
-	nop
-	nop
-	nop
-	j	1b
-	nop
-
-2:	PTR_LA	t1, nlm_next_sp
-	PTR_L	sp, 0(t1)
-	PTR_LA	t1, nlm_next_gp
-	PTR_L	gp, 0(t1)
-
-	/* a0 has the processor id */
-	PTR_LA	t0, nlm_early_init_secondary
-	jalr	t0
-	nop
-
-	PTR_LA	t0, smp_bootstrap
-	jr	t0
-	nop
-END(prom_pre_boot_secondary_cpus)
-	__FINIT
diff --git a/arch/mips/netlogic/xlp/wakeup.c b/arch/mips/netlogic/xlp/wakeup.c
index e081a778678e..44d923ff3846 100644
--- a/arch/mips/netlogic/xlp/wakeup.c
+++ b/arch/mips/netlogic/xlp/wakeup.c
@@ -51,18 +51,20 @@
 #include <asm/netlogic/xlp-hal/xlp.h>
 #include <asm/netlogic/xlp-hal/sys.h>
 
-unsigned long secondary_entry;
-uint32_t nlm_coremask;
-unsigned int nlm_threads_per_core;
-unsigned int nlm_threadmode;
-
-static void nlm_enable_secondary_cores(unsigned int cores_bitmap)
+static void xlp_enable_secondary_cores(void)
 {
-	uint32_t core, value, coremask;
+	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 ((cores_bitmap & coremask) == 0)
+		if ((nlm_coremask & coremask) == 0)
 			continue;
 
 		/* Enable CPU clock */
@@ -76,74 +78,25 @@ static void nlm_enable_secondary_cores(unsigned int cores_bitmap)
 		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);
-	}
-}
-
-
-static void nlm_parse_cpumask(u32 cpu_mask)
-{
-	uint32_t core0_thr_mask, core_thr_mask;
-	int i;
+		} while ((value & coremask) != 0 && count-- > 0);
 
-	core0_thr_mask = cpu_mask & 0xf;
-	switch (core0_thr_mask) {
-	case 1:
-		nlm_threads_per_core = 1;
-		nlm_threadmode = 0;
-		break;
-	case 3:
-		nlm_threads_per_core = 2;
-		nlm_threadmode = 2;
-		break;
-	case 0xf:
-		nlm_threads_per_core = 4;
-		nlm_threadmode = 3;
-		break;
-	default:
-		goto unsupp;
+		if (count == 0)
+			pr_err("Failed to enable core %d\n", core);
 	}
-
-	/* Verify other cores CPU masks */
-	nlm_coremask = 1;
-	for (i = 1; i < 8; i++) {
-		core_thr_mask = (cpu_mask >> (i * 4)) & 0xf;
-		if (core_thr_mask) {
-			if (core_thr_mask != core0_thr_mask)
-				goto unsupp;
-			nlm_coremask |= 1 << i;
-		}
-	}
-	return;
-
-unsupp:
-	panic("Unsupported CPU mask %x\n", cpu_mask);
 }
 
-int __cpuinit nlm_wakeup_secondary_cpus(u32 wakeup_mask)
+void xlp_wakeup_secondary_cpus(void)
 {
-	unsigned long reset_vec;
-	unsigned int *reset_data;
-
-	/* Update reset entry point with CPU init code */
-	reset_vec = CKSEG1ADDR(RESET_VEC_PHYS);
-	memcpy((void *)reset_vec, (void *)nlm_reset_entry,
-			(nlm_reset_entry_end - nlm_reset_entry));
-
-	/* verify the mask and setup core config variables */
-	nlm_parse_cpumask(wakeup_mask);
-
-	/* Setup CPU init parameters */
-	reset_data = (unsigned int *)CKSEG1ADDR(RESET_DATA_PHYS);
-	reset_data[BOOT_THREAD_MODE] = nlm_threadmode;
-
-	/* first wakeup core 0 siblings */
-	nlm_boot_core0_siblings();
-
-	/* enable the reset of the cores */
-	nlm_enable_secondary_cores(nlm_coremask);
-	return 0;
+	/*
+	 * 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();
 }