diff options
Diffstat (limited to 'arch/arc/kernel')
| -rw-r--r-- | arch/arc/kernel/entry.S | 4 | ||||
| -rw-r--r-- | arch/arc/kernel/setup.c | 53 | ||||
| -rw-r--r-- | arch/arc/kernel/vmlinux.lds.S | 21 |
3 files changed, 75 insertions, 3 deletions
diff --git a/arch/arc/kernel/entry.S b/arch/arc/kernel/entry.S index f8efade15368..3f628ca9b71a 100644 --- a/arch/arc/kernel/entry.S +++ b/arch/arc/kernel/entry.S @@ -149,7 +149,7 @@ VECTOR reserved ; Reserved Exceptions ;##################### Scratch Mem for IRQ stack switching ############# - .section .data ; NOT .global +ARCFP_DATA int1_saved_reg .align 32 .type int1_saved_reg, @object .size int1_saved_reg, 4 @@ -159,7 +159,7 @@ int1_saved_reg: /* Each Interrupt level needs it's own scratch */ #ifdef CONFIG_ARC_COMPACT_IRQ_LEVELS - .section .data ; NOT .global +ARCFP_DATA int2_saved_reg .type int2_saved_reg, @object .size int2_saved_reg, 4 int2_saved_reg: diff --git a/arch/arc/kernel/setup.c b/arch/arc/kernel/setup.c index e25538e29fe7..6cc361c6751a 100644 --- a/arch/arc/kernel/setup.c +++ b/arch/arc/kernel/setup.c @@ -64,6 +64,33 @@ void __init read_arc_build_cfg_regs(void) cpu->extn.ext_arith = read_aux_reg(ARC_REG_EXTARITH_BCR); cpu->extn.crc = read_aux_reg(ARC_REG_CRC_BCR); + /* Note that we read the CCM BCRs independent of kernel config + * This is to catch the cases where user doesn't know that + * CCMs are present in hardware build + */ + { + struct bcr_iccm iccm; + struct bcr_dccm dccm; + struct bcr_dccm_base dccm_base; + unsigned int bcr_32bit_val; + + bcr_32bit_val = read_aux_reg(ARC_REG_ICCM_BCR); + if (bcr_32bit_val) { + iccm = *((struct bcr_iccm *)&bcr_32bit_val); + cpu->iccm.base_addr = iccm.base << 16; + cpu->iccm.sz = 0x2000 << (iccm.sz - 1); + } + + bcr_32bit_val = read_aux_reg(ARC_REG_DCCM_BCR); + if (bcr_32bit_val) { + dccm = *((struct bcr_dccm *)&bcr_32bit_val); + cpu->dccm.sz = 0x800 << (dccm.sz); + + READ_BCR(ARC_REG_DCCMBASE_BCR, dccm_base); + cpu->dccm.base_addr = dccm_base.addr << 8; + } + } + READ_BCR(ARC_REG_XY_MEM_BCR, cpu->extn_xymem); read_decode_mmu_bcr(); @@ -211,6 +238,30 @@ char *arc_extn_mumbojumbo(int cpu_id, char *buf, int len) return buf; } +void __init arc_chk_ccms(void) +{ +#if defined(CONFIG_ARC_HAS_DCCM) || defined(CONFIG_ARC_HAS_ICCM) + struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()]; + +#ifdef CONFIG_ARC_HAS_DCCM + /* + * DCCM can be arbit placed in hardware. + * Make sure it's placement/sz matches what Linux is built with + */ + if ((unsigned int)__arc_dccm_base != cpu->dccm.base_addr) + panic("Linux built with incorrect DCCM Base address\n"); + + if (CONFIG_ARC_DCCM_SZ != cpu->dccm.sz) + panic("Linux built with incorrect DCCM Size\n"); +#endif + +#ifdef CONFIG_ARC_HAS_ICCM + if (CONFIG_ARC_ICCM_SZ != cpu->iccm.sz) + panic("Linux built with incorrect ICCM Size\n"); +#endif +#endif +} + /* * Ensure that FP hardware and kernel config match * -If hardware contains DPFP, kernel needs to save/restore FPU state @@ -255,7 +306,7 @@ void __init setup_processor(void) arc_mmu_init(); arc_cache_init(); - + arc_chk_ccms(); printk(arc_extn_mumbojumbo(cpu_id, str, sizeof(str))); diff --git a/arch/arc/kernel/vmlinux.lds.S b/arch/arc/kernel/vmlinux.lds.S index 303ea01c85c8..8d3b0d447498 100644 --- a/arch/arc/kernel/vmlinux.lds.S +++ b/arch/arc/kernel/vmlinux.lds.S @@ -23,6 +23,12 @@ jiffies = jiffies_64; SECTIONS { + /* + * ICCM starts at 0x8000_0000. So if kernel is relocated to some other + * address, make sure peripheral at 0x8z doesn't clash with ICCM + * Essentially vector is also in ICCM. + */ + . = CONFIG_LINUX_LINK_BASE; _int_vec_base_lds = .; @@ -31,6 +37,13 @@ SECTIONS . = ALIGN(PAGE_SIZE); } +#ifdef CONFIG_ARC_HAS_ICCM + .text.arcfp : { + *(.text.arcfp) + . = ALIGN(CONFIG_ARC_ICCM_SZ * 1024); + } +#endif + /* * The reason for having a seperate subsection .init.ramfs is to * prevent objump from including it in kernel dumps @@ -134,4 +147,12 @@ SECTIONS .debug_loc 0 : { *(.debug_loc) } .debug_macinfo 0 : { *(.debug_macinfo) } +#ifdef CONFIG_ARC_HAS_DCCM + . = CONFIG_ARC_DCCM_BASE; + __arc_dccm_base = .; + .data.arcfp : { + *(.data.arcfp) + } + . = ALIGN(CONFIG_ARC_DCCM_SZ * 1024); +#endif } |