Blackfin arch: SMP supporting patchset: BF561 related code

Blackfin dual core BF561 processor can support SMP like features.
https://docs.blackfin.uclinux.org/doku.php?id=linux-kernel:smp-like

In this patch, we provide SMP extend to BF561 kernel code

Signed-off-by: Graf Yang <graf.yang@analog.com>
Signed-off-by: Mike Frysinger <vapier.adi@gmail.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>

1 files changed, 215 insertions, 0 deletions

diff --git a/arch/blackfin/mach-bf561/secondary.S b/arch/blackfin/mach-bf561/secondary.S
new file mode 100644
index 00000000000..35280f06b7b
--- /dev/null
+++ b/arch/blackfin/mach-bf561/secondary.S
@@ -0,0 +1,215 @@
+/*
+ * File:         arch/blackfin/mach-bf561/secondary.S
+ * Based on:     arch/blackfin/mach-bf561/head.S
+ * Author:       Philippe Gerum <rpm@xenomai.org>
+ *
+ *               Copyright 2007 Analog Devices Inc.
+ *
+ * Description:  BF561 coreB bootstrap file
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include <linux/linkage.h>
+#include <linux/init.h>
+#include <asm/blackfin.h>
+#include <asm/asm-offsets.h>
+
+__INIT
+
+/* Lay the initial stack into the L1 scratch area of Core B */
+#define INITIAL_STACK	(COREB_L1_SCRATCH_START + L1_SCRATCH_LENGTH - 12)
+
+ENTRY(_coreb_trampoline_start)
+	/* Set the SYSCFG register */
+	R0 = 0x36;
+	SYSCFG = R0; /*Enable Cycle Counter and Nesting Of Interrupts(3rd Bit)*/
+	R0 = 0;
+
+	/*Clear Out All the data and pointer  Registers*/
+	R1 = R0;
+	R2 = R0;
+	R3 = R0;
+	R4 = R0;
+	R5 = R0;
+	R6 = R0;
+	R7 = R0;
+
+	P0 = R0;
+	P1 = R0;
+	P2 = R0;
+	P3 = R0;
+	P4 = R0;
+	P5 = R0;
+
+	LC0 = r0;
+	LC1 = r0;
+	L0 = r0;
+	L1 = r0;
+	L2 = r0;
+	L3 = r0;
+
+	/* Clear Out All the DAG Registers*/
+	B0 = r0;
+	B1 = r0;
+	B2 = r0;
+	B3 = r0;
+
+	I0 = r0;
+	I1 = r0;
+	I2 = r0;
+	I3 = r0;
+
+	M0 = r0;
+	M1 = r0;
+	M2 = r0;
+	M3 = r0;
+
+	/* Turn off the icache */
+	p0.l = LO(IMEM_CONTROL);
+	p0.h = HI(IMEM_CONTROL);
+	R1 = [p0];
+	R0 = ~ENICPLB;
+	R0 = R0 & R1;
+
+	/* Anomaly 05000125 */
+#ifdef ANOMALY_05000125
+	CLI R2;
+	SSYNC;
+#endif
+	[p0] = R0;
+	SSYNC;
+#ifdef ANOMALY_05000125
+	STI R2;
+#endif
+
+	/* Turn off the dcache */
+	p0.l = LO(DMEM_CONTROL);
+	p0.h = HI(DMEM_CONTROL);
+	R1 = [p0];
+	R0 = ~ENDCPLB;
+	R0 = R0 & R1;
+
+	/* Anomaly 05000125 */
+#ifdef ANOMALY_05000125
+	CLI R2;
+	SSYNC;
+#endif
+	[p0] = R0;
+	SSYNC;
+#ifdef ANOMALY_05000125
+	STI R2;
+#endif
+
+	/* in case of double faults, save a few things */
+	p0.l = _init_retx_coreb;
+	p0.h = _init_retx_coreb;
+	R0 = RETX;
+	[P0] = R0;
+
+#ifdef CONFIG_DEBUG_DOUBLEFAULT
+	/* Only save these if we are storing them,
+	 * This happens here, since L1 gets clobbered
+	 * below
+	 */
+	GET_PDA(p0, r0);
+	r7 = [p0 + PDA_RETX];
+	p1.l = _init_saved_retx_coreb;
+	p1.h = _init_saved_retx_coreb;
+	[p1] = r7;
+
+	r7 = [p0 + PDA_DCPLB];
+	p1.l = _init_saved_dcplb_fault_addr_coreb;
+	p1.h = _init_saved_dcplb_fault_addr_coreb;
+	[p1] = r7;
+
+	r7 = [p0 + PDA_ICPLB];
+	p1.l = _init_saved_icplb_fault_addr_coreb;
+	p1.h = _init_saved_icplb_fault_addr_coreb;
+	[p1] = r7;
+
+	r7 = [p0 + PDA_SEQSTAT];
+	p1.l = _init_saved_seqstat_coreb;
+	p1.h = _init_saved_seqstat_coreb;
+	[p1] = r7;
+#endif
+
+	/* Initialize stack pointer */
+	sp.l = lo(INITIAL_STACK);
+	sp.h = hi(INITIAL_STACK);
+	fp = sp;
+	usp = sp;
+
+	/* This section keeps the processor in supervisor mode
+	 * during core B startup.  Branches to the idle task.
+	 */
+
+	/* EVT15 = _real_start */
+
+	p0.l = lo(EVT15);
+	p0.h = hi(EVT15);
+	p1.l = _coreb_start;
+	p1.h = _coreb_start;
+	[p0] = p1;
+	csync;
+
+	p0.l = lo(IMASK);
+	p0.h = hi(IMASK);
+	p1.l = IMASK_IVG15;
+	p1.h = 0x0;
+	[p0] = p1;
+	csync;
+
+	raise 15;
+	p0.l = .LWAIT_HERE;
+	p0.h = .LWAIT_HERE;
+	reti = p0;
+#if defined(ANOMALY_05000281)
+	nop; nop; nop;
+#endif
+	rti;
+
+.LWAIT_HERE:
+	jump .LWAIT_HERE;
+ENDPROC(_coreb_trampoline_start)
+ENTRY(_coreb_trampoline_end)
+
+ENTRY(_coreb_start)
+	[--sp] = reti;
+
+	p0.l = lo(WDOGB_CTL);
+	p0.h = hi(WDOGB_CTL);
+	r0 = 0xAD6(z);
+	w[p0] = r0;	/* Clear the watchdog. */
+	ssync;
+
+	/*
+	 * switch to IDLE stack.
+	 */
+	p0.l = _secondary_stack;
+	p0.h = _secondary_stack;
+	sp = [p0];
+	usp = sp;
+	fp = sp;
+	sp += -12;
+	call _init_pda
+	sp += 12;
+	call _secondary_start_kernel;
+.L_exit:
+	jump.s	.L_exit;
+ENDPROC(_coreb_start)
+
+__FINIT