diff options
| author | Edgar E. Iglesias <edgar.iglesias@petalogix.com> | 2010-01-24 20:38:29 +0100 |
|---|---|---|
| committer | Edgar E. Iglesias <edgar.iglesias@gmail.com> | 2010-01-27 13:01:53 +0100 |
| commit | b4bf0a9a69961d8b7b3817f79dafae77fbd305bd (patch) | |
| tree | bd1fdc009db6ccd541a1f8c3f722a6c919a0d325 | |
| parent | 625a5befc2e3200b396594f002218d235e375da5 (diff) | |
pflash: Buffer block writes
Buffer block writes to avoid flushing every word access onto backing
storage device. This significantly speeds up flash emulation for flashes
connected through an 8 or 16-bit bus combined with backing storage (-pflash).
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@petalogix.com>
| -rw-r--r-- | hw/pflash_cfi01.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/hw/pflash_cfi01.c b/hw/pflash_cfi01.c index d9e30d9942..95b406be71 100644 --- a/hw/pflash_cfi01.c +++ b/hw/pflash_cfi01.c @@ -72,6 +72,7 @@ struct pflash_t { uint8_t cfi_len; uint8_t cfi_table[0x52]; target_phys_addr_t counter; + unsigned int writeblock_size; QEMUTimer *timer; ram_addr_t off; int fl_mem; @@ -206,7 +207,6 @@ static inline void pflash_data_write(pflash_t *pfl, target_phys_addr_t offset, switch (width) { case 1: p[offset] = value; - pflash_update(pfl, offset, 1); break; case 2: #if defined(TARGET_WORDS_BIGENDIAN) @@ -216,7 +216,6 @@ static inline void pflash_data_write(pflash_t *pfl, target_phys_addr_t offset, p[offset] = value; p[offset + 1] = value >> 8; #endif - pflash_update(pfl, offset, 2); break; case 4: #if defined(TARGET_WORDS_BIGENDIAN) @@ -230,7 +229,6 @@ static inline void pflash_data_write(pflash_t *pfl, target_phys_addr_t offset, p[offset + 2] = value >> 16; p[offset + 3] = value >> 24; #endif - pflash_update(pfl, offset, 4); break; } @@ -307,6 +305,7 @@ static void pflash_write(pflash_t *pfl, target_phys_addr_t offset, case 0x40: /* Single Byte Program */ DPRINTF("%s: Single Byte Program\n", __func__); pflash_data_write(pfl, offset, value, width); + pflash_update(pfl, offset, width); pfl->status |= 0x80; /* Ready! */ pfl->wcycle = 0; break; @@ -359,8 +358,13 @@ static void pflash_write(pflash_t *pfl, target_phys_addr_t offset, pfl->status |= 0x80; if (!pfl->counter) { + target_phys_addr_t mask = pfl->writeblock_size - 1; + mask = ~mask; + DPRINTF("%s: block write finished\n", __func__); pfl->wcycle++; + /* Flush the entire write buffer onto backing storage. */ + pflash_update(pfl, offset & mask, pfl->writeblock_size); } pfl->counter--; @@ -606,6 +610,8 @@ pflash_t *pflash_cfi01_register(target_phys_addr_t base, ram_addr_t off, } else { pfl->cfi_table[0x2A] = 0x0B; } + pfl->writeblock_size = 1 << pfl->cfi_table[0x2A]; + pfl->cfi_table[0x2B] = 0x00; /* Number of erase block regions (uniform) */ pfl->cfi_table[0x2C] = 0x01; |