diff options
Diffstat (limited to 'arch/blackfin/kernel/cplb-mpu/cplbinit.c')
| -rw-r--r-- | arch/blackfin/kernel/cplb-mpu/cplbinit.c | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/arch/blackfin/kernel/cplb-mpu/cplbinit.c b/arch/blackfin/kernel/cplb-mpu/cplbinit.c new file mode 100644 index 00000000..c15fd05f --- /dev/null +++ b/arch/blackfin/kernel/cplb-mpu/cplbinit.c @@ -0,0 +1,102 @@ +/* + * Blackfin CPLB initialization + * + * Copyright 2008-2009 Analog Devices Inc. + * + * Licensed under the GPL-2 or later. + */ + +#include <linux/module.h> + +#include <asm/blackfin.h> +#include <asm/cplb.h> +#include <asm/cplbinit.h> +#include <asm/mem_map.h> + +struct cplb_entry icplb_tbl[NR_CPUS][MAX_CPLBS]; +struct cplb_entry dcplb_tbl[NR_CPUS][MAX_CPLBS]; + +int first_switched_icplb, first_switched_dcplb; +int first_mask_dcplb; + +void __init generate_cplb_tables_cpu(unsigned int cpu) +{ + int i_d, i_i; + unsigned long addr; + unsigned long d_data, i_data; + unsigned long d_cache = 0, i_cache = 0; + + printk(KERN_INFO "MPU: setting up cplb tables with memory protection\n"); + +#ifdef CONFIG_BFIN_EXTMEM_ICACHEABLE + i_cache = CPLB_L1_CHBL | ANOMALY_05000158_WORKAROUND; +#endif + +#ifdef CONFIG_BFIN_EXTMEM_DCACHEABLE + d_cache = CPLB_L1_CHBL; +#ifdef CONFIG_BFIN_EXTMEM_WRITETHROUGH + d_cache |= CPLB_L1_AOW | CPLB_WT; +#endif +#endif + + i_d = i_i = 0; + + /* Set up the zero page. */ + dcplb_tbl[cpu][i_d].addr = 0; + dcplb_tbl[cpu][i_d++].data = SDRAM_OOPS | PAGE_SIZE_1KB; + + icplb_tbl[cpu][i_i].addr = 0; + icplb_tbl[cpu][i_i++].data = CPLB_VALID | i_cache | CPLB_USER_RD | PAGE_SIZE_1KB; + + /* Cover kernel memory with 4M pages. */ + addr = 0; + d_data = d_cache | CPLB_SUPV_WR | CPLB_VALID | PAGE_SIZE_4MB | CPLB_DIRTY; + i_data = i_cache | CPLB_VALID | CPLB_PORTPRIO | PAGE_SIZE_4MB; + + for (; addr < memory_start; addr += 4 * 1024 * 1024) { + dcplb_tbl[cpu][i_d].addr = addr; + dcplb_tbl[cpu][i_d++].data = d_data; + icplb_tbl[cpu][i_i].addr = addr; + icplb_tbl[cpu][i_i++].data = i_data | (addr == 0 ? CPLB_USER_RD : 0); + } + +#ifdef CONFIG_ROMKERNEL + /* Cover kernel XIP flash area */ + addr = CONFIG_ROM_BASE & ~(4 * 1024 * 1024 - 1); + dcplb_tbl[cpu][i_d].addr = addr; + dcplb_tbl[cpu][i_d++].data = d_data | CPLB_USER_RD; + icplb_tbl[cpu][i_i].addr = addr; + icplb_tbl[cpu][i_i++].data = i_data | CPLB_USER_RD; +#endif + + /* Cover L1 memory. One 4M area for code and data each is enough. */ +#if L1_DATA_A_LENGTH > 0 || L1_DATA_B_LENGTH > 0 + dcplb_tbl[cpu][i_d].addr = get_l1_data_a_start_cpu(cpu); + dcplb_tbl[cpu][i_d++].data = L1_DMEMORY | PAGE_SIZE_4MB; +#endif +#if L1_CODE_LENGTH > 0 + icplb_tbl[cpu][i_i].addr = get_l1_code_start_cpu(cpu); + icplb_tbl[cpu][i_i++].data = L1_IMEMORY | PAGE_SIZE_4MB; +#endif + + /* Cover L2 memory */ +#if L2_LENGTH > 0 + dcplb_tbl[cpu][i_d].addr = L2_START; + dcplb_tbl[cpu][i_d++].data = L2_DMEMORY; + icplb_tbl[cpu][i_i].addr = L2_START; + icplb_tbl[cpu][i_i++].data = L2_IMEMORY; +#endif + + first_mask_dcplb = i_d; + first_switched_dcplb = i_d + (1 << page_mask_order); + first_switched_icplb = i_i; + + while (i_d < MAX_CPLBS) + dcplb_tbl[cpu][i_d++].data = 0; + while (i_i < MAX_CPLBS) + icplb_tbl[cpu][i_i++].data = 0; +} + +void __init generate_cplb_tables_all(void) +{ +} |