diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/kernel/tcm.c | 68 |
1 files changed, 46 insertions, 22 deletions
diff --git a/arch/arm/kernel/tcm.c b/arch/arm/kernel/tcm.c index 0c62aa2c86ea..f2ead32c1aa0 100644 --- a/arch/arm/kernel/tcm.c +++ b/arch/arm/kernel/tcm.c @@ -92,14 +92,24 @@ void tcm_free(void *addr, size_t len) } EXPORT_SYMBOL(tcm_free); - -static void __init setup_tcm_bank(u8 type, u32 offset, u32 expected_size) +static void __init setup_tcm_bank(u8 type, u8 bank, u8 banks, + u32 offset, u32 expected_size) { const int tcm_sizes[16] = { 0, -1, -1, 4, 8, 16, 32, 64, 128, 256, 512, 1024, -1, -1, -1, -1 }; u32 tcm_region; int tcm_size; + /* + * If there are more than one TCM bank of this type, + * select the TCM bank to operate on in the TCM selection + * register. + */ + if (banks > 1) + asm("mcr p15, 0, %0, c9, c2, 0" + : /* No output operands */ + : "r" (bank)); + /* Read the special TCM region register c9, 0 */ if (!type) asm("mrc p15, 0, %0, c9, c1, 0" @@ -110,21 +120,23 @@ static void __init setup_tcm_bank(u8 type, u32 offset, u32 expected_size) tcm_size = tcm_sizes[(tcm_region >> 2) & 0x0f]; if (tcm_size < 0) { - pr_err("CPU: %sTCM of unknown size!\n", - type ? "I" : "D"); + pr_err("CPU: %sTCM%d of unknown size!\n", + type ? "I" : "D", bank); } else { - pr_info("CPU: found %sTCM %dk @ %08x, %senabled\n", + pr_info("CPU: found %sTCM%d %dk @ %08x, %senabled\n", type ? "I" : "D", + bank, tcm_size, (tcm_region & 0xfffff000U), (tcm_region & 1) ? "" : "not "); } - if (tcm_size != expected_size) { - pr_crit("CPU: %sTCM was detected %dk but expected %dk!\n", - type ? "I" : "D", - tcm_size, - expected_size); + if (tcm_size != (expected_size >> 10)) { + pr_crit("CPU: %sTCM%d was detected %dk but expected %dk!\n", + type ? "I" : "D", + bank, + tcm_size, + (expected_size >> 10)); /* Adjust to the expected size? what can we do... */ } @@ -140,26 +152,37 @@ static void __init setup_tcm_bank(u8 type, u32 offset, u32 expected_size) : /* No output operands */ : "r" (tcm_region)); - pr_debug("CPU: moved %sTCM %dk to %08x, enabled\n", - type ? "I" : "D", - tcm_size, - (tcm_region & 0xfffff000U)); + pr_info("CPU: moved %sTCM%d %dk to %08x, enabled\n", + type ? "I" : "D", + bank, + tcm_size, + (tcm_region & 0xfffff000U)); } +/* We expect to find what is configured for the platform */ +#define DTCM_EXPECTED (DTCM_END - DTCM_OFFSET + 1) +#define ITCM_EXPECTED (ITCM_END - ITCM_OFFSET + 1) + /* * This initializes the TCM memory */ void __init tcm_init(void) { u32 tcm_status = read_cpuid_tcmstatus(); + u8 dtcm_banks = (tcm_status >> 16) & 0x03; + u32 dtcm_banksize = DTCM_EXPECTED / dtcm_banks; + u8 itcm_banks = (tcm_status & 0x03); + u32 itcm_banksize = ITCM_EXPECTED / itcm_banks; char *start; char *end; char *ram; + int i; /* Setup DTCM if present */ - if (tcm_status & (1 << 16)) { - setup_tcm_bank(0, DTCM_OFFSET, - (DTCM_END - DTCM_OFFSET + 1) >> 10); + for (i = 0; i < dtcm_banks; i++) { + setup_tcm_bank(0, i, dtcm_banks, + DTCM_OFFSET + (i * dtcm_banksize), + dtcm_banksize); request_resource(&iomem_resource, &dtcm_res); iotable_init(dtcm_iomap, 1); /* Copy data from RAM to DTCM */ @@ -171,9 +194,10 @@ void __init tcm_init(void) } /* Setup ITCM if present */ - if (tcm_status & 1) { - setup_tcm_bank(1, ITCM_OFFSET, - (ITCM_END - ITCM_OFFSET + 1) >> 10); + for (i = 0; i < itcm_banks; i++) { + setup_tcm_bank(1, i, itcm_banks, + ITCM_OFFSET + (i * itcm_banksize), + itcm_banksize); request_resource(&iomem_resource, &itcm_res); iotable_init(itcm_iomap, 1); /* Copy code from RAM to ITCM */ @@ -207,7 +231,7 @@ static int __init setup_tcm_pool(void) pr_debug("Setting up TCM memory pool\n"); /* Add the rest of DTCM to the TCM pool */ - if (tcm_status & (1 << 16)) { + if (tcm_status & (0x03 << 16)) { if (dtcm_pool_start < DTCM_END) { ret = gen_pool_add(tcm_pool, dtcm_pool_start, DTCM_END - dtcm_pool_start + 1, -1); @@ -224,7 +248,7 @@ static int __init setup_tcm_pool(void) } /* Add the rest of ITCM to the TCM pool */ - if (tcm_status & 1) { + if (tcm_status & 0x03) { if (itcm_pool_start < ITCM_END) { ret = gen_pool_add(tcm_pool, itcm_pool_start, ITCM_END - itcm_pool_start + 1, -1); |
