ARC: Support for single cycle Close Coupled Mem (CCM)

* Includes mapping of CCMs in address space
* Annotations to move arbitrary code/data into CCM
* Moving some of the critical code/data into CCM
* Runtime detection/reporting

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
This commit is contained in:
Vineet Gupta 2013-01-18 15:12:25 +05:30
parent 9c57564e26
commit 8b5850f8ac
6 changed files with 137 additions and 6 deletions

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@ -198,6 +198,33 @@ config ARC_CACHE_PAGES
endif #ARC_CACHE
config ARC_HAS_ICCM
bool "Use ICCM"
help
Single Cycle RAMS to store Fast Path Code
default n
config ARC_ICCM_SZ
int "ICCM Size in KB"
default "64"
depends on ARC_HAS_ICCM
config ARC_HAS_DCCM
bool "Use DCCM"
help
Single Cycle RAMS to store Fast Path Data
default n
config ARC_DCCM_SZ
int "DCCM Size in KB"
default "64"
depends on ARC_HAS_DCCM
config ARC_DCCM_BASE
hex "DCCM map address"
default "0xA0000000"
depends on ARC_HAS_DCCM
config ARC_HAS_HW_MPY
bool "Use Hardware Multiplier (Normal or Faster XMAC)"
default y

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@ -25,6 +25,39 @@
.size \ name, ASM_PREV_SYM_ADDR(\name)
.endm
/* annotation for data we want in DCCM - if enabled in .config */
.macro ARCFP_DATA nm
#ifdef CONFIG_ARC_HAS_DCCM
.section .data.arcfp
#else
.section .data
#endif
.global \nm
.endm
/* annotation for data we want in DCCM - if enabled in .config */
.macro ARCFP_CODE
#ifdef CONFIG_ARC_HAS_ICCM
.section .text.arcfp, "ax",@progbits
#else
.section .text, "ax",@progbits
#endif
.endm
#else /* !__ASSEMBLY__ */
#ifdef CONFIG_ARC_HAS_ICCM
#define __arcfp_code __attribute__((__section__(".text.arcfp")))
#else
#define __arcfp_code __attribute__((__section__(".text")))
#endif
#ifdef CONFIG_ARC_HAS_DCCM
#define __arcfp_data __attribute__((__section__(".data.arcfp")))
#else
#define __arcfp_data __attribute__((__section__(".data")))
#endif
#endif /* __ASSEMBLY__ */
#endif

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@ -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:

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@ -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)));

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@ -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
}

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@ -53,8 +53,7 @@
; For details refer to comments before TLBMISS_FREEUP_REGS below
;--------------------------------------------------------------------------
.section .data
.global ex_saved_reg1
ARCFP_DATA ex_saved_reg1
.align 1 << L1_CACHE_SHIFT ; IMP: Must be Cache Line aligned
.type ex_saved_reg1, @object
#ifdef CONFIG_SMP
@ -255,7 +254,7 @@ ex_saved_reg1:
#endif
.endm
.section .text, "ax",@progbits ;Fast Path Code, candidate for ICCM
ARCFP_CODE ;Fast Path Code, candidate for ICCM
;-----------------------------------------------------------------------------
; I-TLB Miss Exception Handler