diff options
Diffstat (limited to 'arch/blackfin/mach-bf561/secondary.S')
| -rw-r--r-- | arch/blackfin/mach-bf561/secondary.S | 192 |
1 files changed, 192 insertions, 0 deletions
diff --git a/arch/blackfin/mach-bf561/secondary.S b/arch/blackfin/mach-bf561/secondary.S new file mode 100644 index 00000000..01e54086 --- /dev/null +++ b/arch/blackfin/mach-bf561/secondary.S @@ -0,0 +1,192 @@ +/* + * BF561 coreB bootstrap file + * + * Copyright 2007-2009 Analog Devices Inc. + * Philippe Gerum <rpm@xenomai.org> + * + * Licensed under the GPL-2 or later. + */ + +#include <linux/linkage.h> +#include <linux/init.h> +#include <asm/blackfin.h> +#include <asm/asm-offsets.h> +#include <asm/trace.h> + +/* + * This code must come first as CoreB is hardcoded (in hardware) + * to start at the beginning of its L1 instruction memory. + */ +.section .l1.text.head + +/* 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) + /* Enable Cycle Counter and Nesting Of Interrupts */ +#ifdef CONFIG_BFIN_SCRATCH_REG_CYCLES + R0 = SYSCFG_SNEN; +#else + R0 = SYSCFG_SNEN | SYSCFG_CCEN; +#endif + SYSCFG = R0; + + /* Optimization register tricks: keep a base value in the + * reserved P registers so we use the load/store with an + * offset syntax. R0 = [P5 + <constant>]; + * P5 - core MMR base + * R6 - 0 + */ + r6 = 0; + p5.l = 0; + p5.h = hi(COREMMR_BASE); + + /* Zero out registers required by Blackfin ABI */ + + /* Disable circular buffers */ + L0 = r6; + L1 = r6; + L2 = r6; + L3 = r6; + + /* Disable hardware loops in case we were started by 'go' */ + LC0 = r6; + LC1 = r6; + + /* + * Clear ITEST_COMMAND and DTEST_COMMAND registers, + * Leaving these as non-zero can confuse the emulator + */ + [p5 + (DTEST_COMMAND - COREMMR_BASE)] = r6; + [p5 + (ITEST_COMMAND - COREMMR_BASE)] = r6; + CSYNC; + + trace_buffer_init(p0,r0); + + /* Turn off the icache */ + r1 = [p5 + (IMEM_CONTROL - COREMMR_BASE)]; + BITCLR (r1, ENICPLB_P); + [p5 + (IMEM_CONTROL - COREMMR_BASE)] = r1; + SSYNC; + + /* Turn off the dcache */ + r1 = [p5 + (DMEM_CONTROL - COREMMR_BASE)]; + BITCLR (r1, ENDCPLB_P); + [p5 + (DMEM_CONTROL - COREMMR_BASE)] = r1; + SSYNC; + + /* in case of double faults, save a few things */ + p1.l = _initial_pda_coreb; + p1.h = _initial_pda_coreb; + r4 = RETX; +#ifdef CONFIG_DEBUG_DOUBLEFAULT + /* Only save these if we are storing them, + * This happens here, since L1 gets clobbered + * below + */ + GET_PDA(p0, r0); + r0 = [p0 + PDA_DF_RETX]; + r1 = [p0 + PDA_DF_DCPLB]; + r2 = [p0 + PDA_DF_ICPLB]; + r3 = [p0 + PDA_DF_SEQSTAT]; + [p1 + PDA_INIT_DF_RETX] = r0; + [p1 + PDA_INIT_DF_DCPLB] = r1; + [p1 + PDA_INIT_DF_ICPLB] = r2; + [p1 + PDA_INIT_DF_SEQSTAT] = r3; +#endif + [p1 + PDA_INIT_RETX] = r4; + + /* 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 */ + + p1.l = _coreb_start; + p1.h = _coreb_start; + [p5 + (EVT15 - COREMMR_BASE)] = p1; + csync; + + r0 = EVT_IVG15 (z); + sti r0; + + 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) + +#ifdef CONFIG_HOTPLUG_CPU +.section ".text" +ENTRY(_coreb_die) + sp.l = lo(INITIAL_STACK); + sp.h = hi(INITIAL_STACK); + fp = sp; + usp = sp; + + CLI R2; + SSYNC; + IDLE; + STI R2; + + R0 = IWR_DISABLE_ALL; + P0.H = hi(SYSMMR_BASE); + P0.L = lo(SYSMMR_BASE); + [P0 + (SICB_IWR0 - SYSMMR_BASE)] = R0; + [P0 + (SICB_IWR1 - SYSMMR_BASE)] = R0; + SSYNC; + + p0.h = hi(COREB_L1_CODE_START); + p0.l = lo(COREB_L1_CODE_START); + jump (p0); +ENDPROC(_coreb_die) +#endif + +__INIT +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; +#ifdef CONFIG_HOTPLUG_CPU + p0.l = _hotplug_coreb; + p0.h = _hotplug_coreb; + r0 = [p0]; + cc = BITTST(r0, 0); + if cc jump 3f; +#endif + sp += -12; + call _init_pda + sp += 12; +#ifdef CONFIG_HOTPLUG_CPU +3: +#endif + call _secondary_start_kernel; +.L_exit: + jump.s .L_exit; +ENDPROC(_coreb_start) |