diff options
Diffstat (limited to 'hw/block')
| -rw-r--r-- | hw/block/pflash_cfi01.c | 105 |
1 files changed, 94 insertions, 11 deletions
diff --git a/hw/block/pflash_cfi01.c b/hw/block/pflash_cfi01.c index de7a6c0847..8fd50fb748 100644 --- a/hw/block/pflash_cfi01.c +++ b/hw/block/pflash_cfi01.c @@ -119,6 +119,67 @@ static void pflash_timer (void *opaque) pfl->cmd = 0; } +/* Perform a CFI query based on the bank width of the flash. + * If this code is called we know we have a device_width set for + * this flash. + */ +static uint32_t pflash_cfi_query(pflash_t *pfl, hwaddr offset) +{ + int i; + uint32_t resp = 0; + hwaddr boff; + + /* Adjust incoming offset to match expected device-width + * addressing. CFI query addresses are always specified in terms of + * the maximum supported width of the device. This means that x8 + * devices and x8/x16 devices in x8 mode behave differently. For + * devices that are not used at their max width, we will be + * provided with addresses that use higher address bits than + * expected (based on the max width), so we will shift them lower + * so that they will match the addresses used when + * device_width==max_device_width. + */ + boff = offset >> (ctz32(pfl->bank_width) + + ctz32(pfl->max_device_width) - ctz32(pfl->device_width)); + + if (boff > pfl->cfi_len) { + return 0; + } + /* Now we will construct the CFI response generated by a single + * device, then replicate that for all devices that make up the + * bus. For wide parts used in x8 mode, CFI query responses + * are different than native byte-wide parts. + */ + resp = pfl->cfi_table[boff]; + if (pfl->device_width != pfl->max_device_width) { + /* The only case currently supported is x8 mode for a + * wider part. + */ + if (pfl->device_width != 1 || pfl->bank_width > 4) { + DPRINTF("%s: Unsupported device configuration: " + "device_width=%d, max_device_width=%d\n", + __func__, pfl->device_width, + pfl->max_device_width); + return 0; + } + /* CFI query data is repeated, rather than zero padded for + * wide devices used in x8 mode. + */ + for (i = 1; i < pfl->max_device_width; i++) { + resp = deposit32(resp, 8 * i, 8, pfl->cfi_table[boff]); + } + } + /* Replicate responses for each device in bank. */ + if (pfl->device_width < pfl->bank_width) { + for (i = pfl->device_width; + i < pfl->bank_width; i += pfl->device_width) { + resp = deposit32(resp, 8 * i, 8 * pfl->device_width, resp); + } + } + + return resp; +} + static uint32_t pflash_read (pflash_t *pfl, hwaddr offset, int width, int be) { @@ -127,13 +188,6 @@ static uint32_t pflash_read (pflash_t *pfl, hwaddr offset, uint8_t *p; ret = -1; - boff = offset & 0xFF; /* why this here ?? */ - - if (pfl->bank_width == 2) { - boff = boff >> 1; - } else if (pfl->bank_width == 4) { - boff = boff >> 2; - } #if 0 DPRINTF("%s: reading offset " TARGET_FMT_plx " under cmd %02x width %d\n", @@ -213,6 +267,13 @@ static uint32_t pflash_read (pflash_t *pfl, hwaddr offset, DPRINTF("%s: status %x\n", __func__, ret); break; case 0x90: + boff = offset & 0xFF; + if (pfl->bank_width == 2) { + boff = boff >> 1; + } else if (pfl->bank_width == 4) { + boff = boff >> 2; + } + switch (boff) { case 0: ret = pfl->ident0 << 8 | pfl->ident1; @@ -230,10 +291,32 @@ static uint32_t pflash_read (pflash_t *pfl, hwaddr offset, } break; case 0x98: /* Query mode */ - if (boff > pfl->cfi_len) - ret = 0; - else - ret = pfl->cfi_table[boff]; + if (!pfl->device_width) { + /* Preserve old behavior if device width not specified */ + boff = offset & 0xFF; + if (pfl->bank_width == 2) { + boff = boff >> 1; + } else if (pfl->bank_width == 4) { + boff = boff >> 2; + } + + if (boff > pfl->cfi_len) { + ret = 0; + } else { + ret = pfl->cfi_table[boff]; + } + } else { + /* If we have a read larger than the bank_width, combine multiple + * CFI queries into a single response. + */ + int i; + for (i = 0; i < width; i += pfl->bank_width) { + ret = deposit32(ret, i * 8, pfl->bank_width * 8, + pflash_cfi_query(pfl, + offset + i * pfl->bank_width)); + } + } + break; } return ret; |