From b5d5b8f98641edac6641af9e19e933083ade603b Mon Sep 17 00:00:00 2001 From: Will Deacon Date: Fri, 22 Jul 2011 18:27:37 +0100 Subject: ARM: hw_breakpoint: add initial Cortex-A15 (debug v7.1) support This patch adds initial support for Cortex-A15 (debug architecture v7.1) to the hw_breakpoint ARM backend. Signed-off-by: Will Deacon --- arch/arm/kernel/hw_breakpoint.c | 55 +++++++++++++++++++++++++++-------------- 1 file changed, 36 insertions(+), 19 deletions(-) (limited to 'arch/arm/kernel/hw_breakpoint.c') diff --git a/arch/arm/kernel/hw_breakpoint.c b/arch/arm/kernel/hw_breakpoint.c index a927ca1f5566..b6ddbfaae52c 100644 --- a/arch/arm/kernel/hw_breakpoint.c +++ b/arch/arm/kernel/hw_breakpoint.c @@ -154,7 +154,10 @@ u8 arch_get_debug_arch(void) static int debug_arch_supported(void) { u8 arch = get_debug_arch(); - return arch >= ARM_DEBUG_ARCH_V6 && arch <= ARM_DEBUG_ARCH_V7_ECP14; + + /* We don't support the memory-mapped interface. */ + return (arch >= ARM_DEBUG_ARCH_V6 && arch <= ARM_DEBUG_ARCH_V7_ECP14) || + arch >= ARM_DEBUG_ARCH_V7_1; } /* Determine number of BRP register available. */ @@ -255,6 +258,7 @@ static int enable_monitor_mode(void) ARM_DBG_WRITE(c1, 0, (dscr | ARM_DSCR_MDBGEN)); break; case ARM_DEBUG_ARCH_V7_ECP14: + case ARM_DEBUG_ARCH_V7_1: ARM_DBG_WRITE(c2, 2, (dscr | ARM_DSCR_MDBGEN)); break; default: @@ -836,7 +840,7 @@ static int hw_breakpoint_pending(unsigned long addr, unsigned int fsr, */ static void reset_ctrl_regs(void *info) { - int i, cpu = smp_processor_id(); + int i, err = 0, cpu = smp_processor_id(); u32 dbg_power; cpumask_t *cpumask = info; @@ -848,33 +852,46 @@ static void reset_ctrl_regs(void *info) * Access Register to avoid taking undefined instruction exceptions * later on. */ - if (debug_arch >= ARM_DEBUG_ARCH_V7_ECP14) { + switch (debug_arch) { + case ARM_DEBUG_ARCH_V7_ECP14: /* * Ensure sticky power-down is clear (i.e. debug logic is * powered up). */ asm volatile("mrc p14, 0, %0, c1, c5, 4" : "=r" (dbg_power)); - if ((dbg_power & 0x1) == 0) { - pr_warning("CPU %d debug is powered down!\n", cpu); - cpumask_or(cpumask, cpumask, cpumask_of(cpu)); - return; - } - + if ((dbg_power & 0x1) == 0) + err = -EPERM; + break; + case ARM_DEBUG_ARCH_V7_1: /* - * Unconditionally clear the lock by writing a value - * other than 0xC5ACCE55 to the access register. + * Ensure the OS double lock is clear. */ - asm volatile("mcr p14, 0, %0, c1, c0, 4" : : "r" (0)); - isb(); + asm volatile("mrc p14, 0, %0, c1, c3, 4" : "=r" (dbg_power)); + if ((dbg_power & 0x1) == 1) + err = -EPERM; + break; + } - /* - * Clear any configured vector-catch events before - * enabling monitor mode. - */ - asm volatile("mcr p14, 0, %0, c0, c7, 0" : : "r" (0)); - isb(); + if (err) { + pr_warning("CPU %d debug is powered down!\n", cpu); + cpumask_or(cpumask, cpumask, cpumask_of(cpu)); + return; } + /* + * Unconditionally clear the lock by writing a value + * other than 0xC5ACCE55 to the access register. + */ + asm volatile("mcr p14, 0, %0, c1, c0, 4" : : "r" (0)); + isb(); + + /* + * Clear any configured vector-catch events before + * enabling monitor mode. + */ + asm volatile("mcr p14, 0, %0, c0, c7, 0" : : "r" (0)); + isb(); + if (enable_monitor_mode()) return; -- cgit v1.2.1