From fc4557879320de99766061a38aaa345c0f72eb31 Mon Sep 17 00:00:00 2001 From: Kevin Cernekee Date: Mon, 20 Oct 2014 21:27:53 -0700 Subject: [PATCH] MIPS: BMIPS: Introduce helper function to change the reset vector This will need to be called from a few different places, and the logic is starting to get a bit hairy (with the need for IPIs, CPU bug workarounds, and hazards). Signed-off-by: Kevin Cernekee Cc: f.fainelli@gmail.com Cc: mbizon@freebox.fr Cc: jogo@openwrt.org Cc: jfraser@broadcom.com Cc: linux-mips@linux-mips.org Cc: devicetree@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/8158/ Signed-off-by: Ralf Baechle --- arch/mips/kernel/smp-bmips.c | 65 ++++++++++++++++++++++++++++++++---- 1 file changed, 58 insertions(+), 7 deletions(-) diff --git a/arch/mips/kernel/smp-bmips.c b/arch/mips/kernel/smp-bmips.c index 4e569113ff56..8383fa460d42 100644 --- a/arch/mips/kernel/smp-bmips.c +++ b/arch/mips/kernel/smp-bmips.c @@ -35,6 +35,7 @@ #include #include #include +#include static int __maybe_unused max_cpus = 1; @@ -43,6 +44,9 @@ int bmips_smp_enabled = 1; int bmips_cpu_offset; cpumask_t bmips_booted_mask; +#define RESET_FROM_KSEG0 0x80080800 +#define RESET_FROM_KSEG1 0xa0080800 + #ifdef CONFIG_SMP /* initial $sp, $gp - used by arch/mips/kernel/bmips_vec.S */ @@ -463,10 +467,61 @@ static inline void bmips_nmi_handler_setup(void) &bmips_smp_int_vec_end); } +struct reset_vec_info { + int cpu; + u32 val; +}; + +static void bmips_set_reset_vec_remote(void *vinfo) +{ + struct reset_vec_info *info = vinfo; + int shift = info->cpu & 0x01 ? 16 : 0; + u32 mask = ~(0xffff << shift), val = info->val >> 16; + + preempt_disable(); + if (smp_processor_id() > 0) { + smp_call_function_single(0, &bmips_set_reset_vec_remote, + info, 1); + } else { + if (info->cpu & 0x02) { + /* BMIPS5200 "should" use mask/shift, but it's buggy */ + bmips_write_zscm_reg(0xa0, (val << 16) | val); + bmips_read_zscm_reg(0xa0); + } else { + write_c0_brcm_bootvec((read_c0_brcm_bootvec() & mask) | + (val << shift)); + } + } + preempt_enable(); +} + +static void bmips_set_reset_vec(int cpu, u32 val) +{ + struct reset_vec_info info; + + if (current_cpu_type() == CPU_BMIPS5000) { + /* this needs to run from CPU0 (which is always online) */ + info.cpu = cpu; + info.val = val; + bmips_set_reset_vec_remote(&info); + } else { + void __iomem *cbr = BMIPS_GET_CBR(); + + if (cpu == 0) + __raw_writel(val, cbr + BMIPS_RELO_VECTOR_CONTROL_0); + else { + if (current_cpu_type() != CPU_BMIPS4380) + return; + __raw_writel(val, cbr + BMIPS_RELO_VECTOR_CONTROL_1); + } + } + __sync(); + back_to_back_c0_hazard(); +} + void bmips_ebase_setup(void) { unsigned long new_ebase = ebase; - void __iomem __maybe_unused *cbr; BUG_ON(ebase != CKSEG0); @@ -492,9 +547,7 @@ void bmips_ebase_setup(void) * 0x8000_0400: normal vectors */ new_ebase = 0x80000400; - cbr = BMIPS_GET_CBR(); - __raw_writel(0x80080800, cbr + BMIPS_RELO_VECTOR_CONTROL_0); - __raw_writel(0xa0080800, cbr + BMIPS_RELO_VECTOR_CONTROL_1); + bmips_set_reset_vec(0, RESET_FROM_KSEG0); break; case CPU_BMIPS5000: /* @@ -502,10 +555,8 @@ void bmips_ebase_setup(void) * 0x8000_1000: normal vectors */ new_ebase = 0x80001000; - write_c0_brcm_bootvec(0xa0088008); + bmips_set_reset_vec(0, RESET_FROM_KSEG0); write_c0_ebase(new_ebase); - if (max_cpus > 2) - bmips_write_zscm_reg(0xa0, 0xa008a008); break; default: return; -- 2.39.5