diff options
Diffstat (limited to 'src/drivers/ao_at45db161d.c')
| -rw-r--r-- | src/drivers/ao_at45db161d.c | 318 |
1 files changed, 318 insertions, 0 deletions
diff --git a/src/drivers/ao_at45db161d.c b/src/drivers/ao_at45db161d.c new file mode 100644 index 00000000..aee9877a --- /dev/null +++ b/src/drivers/ao_at45db161d.c @@ -0,0 +1,318 @@ +/* + * Copyright © 2009 Keith Packard <keithp@keithp.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. + */ + +#include "ao.h" +#include "ao_at45db161d.h" + +/* Total bytes of available storage */ +__pdata uint32_t ao_storage_total; + +/* Block size - device is erased in these units. At least 256 bytes */ +__pdata uint32_t ao_storage_block; + +/* Byte offset of config block. Will be ao_storage_block bytes long */ +__pdata uint32_t ao_storage_config; + +/* Storage unit size - device reads and writes must be within blocks of this size. Usually 256 bytes. */ +__pdata uint16_t ao_storage_unit; + +#define FLASH_CS P1_1 +#define FLASH_CS_INDEX 1 + +#define FLASH_BLOCK_SIZE_MAX 512 + +__xdata uint8_t ao_flash_mutex; + +#define ao_flash_delay() do { \ + _asm nop _endasm; \ + _asm nop _endasm; \ + _asm nop _endasm; \ +} while(0) + +#define ao_flash_cs_low() ao_spi_get_bit(FLASH_CS) + +#define ao_flash_cs_high() ao_spi_put_bit(FLASH_CS) + +struct ao_flash_instruction { + uint8_t instruction; + uint8_t address[3]; +} __xdata ao_flash_instruction; + +static void +ao_flash_set_pagesize_512(void) +{ + ao_flash_cs_low(); + ao_flash_instruction.instruction = FLASH_SET_CONFIG; + ao_flash_instruction.address[0] = FLASH_SET_512_BYTE_0; + ao_flash_instruction.address[1] = FLASH_SET_512_BYTE_1; + ao_flash_instruction.address[2] = FLASH_SET_512_BYTE_2; + ao_spi_send(&ao_flash_instruction, 4); + ao_flash_cs_high(); +} + + +static uint8_t +ao_flash_read_status(void) +{ + ao_flash_cs_low(); + ao_flash_instruction.instruction = FLASH_READ_STATUS; + ao_spi_send(&ao_flash_instruction, 1); + ao_spi_recv(&ao_flash_instruction, 1); + ao_flash_cs_high(); + return ao_flash_instruction.instruction; +} + +#define FLASH_BLOCK_NONE 0xffff + +static __xdata uint8_t ao_flash_data[FLASH_BLOCK_SIZE_MAX]; +static __pdata uint16_t ao_flash_block = FLASH_BLOCK_NONE; +static __pdata uint8_t ao_flash_block_dirty; +static __pdata uint8_t ao_flash_write_pending; +static __pdata uint8_t ao_flash_setup_done; +static __pdata uint8_t ao_flash_block_shift; +static __pdata uint16_t ao_flash_block_size; +static __pdata uint16_t ao_flash_block_mask; + +void +ao_storage_setup(void) __reentrant +{ + uint8_t status; + + if (ao_flash_setup_done) + return; + + ao_mutex_get(&ao_flash_mutex); + if (ao_flash_setup_done) { + ao_mutex_put(&ao_flash_mutex); + return; + } + + /* On first use, check to see if the flash chip has + * been programmed to use 512 byte pages. If not, do so. + * And then, because the flash part must be power cycled + * for that change to take effect, panic. + */ + status = ao_flash_read_status(); + + if (!(status & FLASH_STATUS_PAGESIZE_512)) { + ao_flash_set_pagesize_512(); + ao_panic(AO_PANIC_FLASH); + } + + switch (status & 0x3c) { + + /* AT45DB321D */ + case 0x34: + ao_flash_block_shift = 9; + ao_storage_total = ((uint32_t) 4 * (uint32_t) 1024 * (uint32_t) 1024); + break; + + /* AT45DB161D */ + case 0x2c: + ao_flash_block_shift = 9; + ao_storage_total = ((uint32_t) 2 * (uint32_t) 1024 * (uint32_t) 1024); + break; + + /* AT45DB081D */ + case 0x24: + ao_flash_block_shift = 8; + ao_storage_total = ((uint32_t) 1024 * (uint32_t) 1024); + break; + + /* AT45DB041D */ + case 0x1c: + ao_flash_block_shift = 8; + ao_storage_total = ((uint32_t) 512 * (uint32_t) 1024); + break; + + /* AT45DB021D */ + case 0x14: + ao_flash_block_shift = 8; + ao_storage_total = ((uint32_t) 256 * (uint32_t) 1024); + break; + + /* AT45DB011D */ + case 0x0c: + ao_flash_block_shift = 8; + ao_storage_total = ((uint32_t) 128 * (uint32_t) 1024); + break; + + default: + ao_panic(AO_PANIC_FLASH); + } + ao_flash_block_size = 1 << ao_flash_block_shift; + ao_flash_block_mask = ao_flash_block_size - 1; + + ao_storage_block = ao_flash_block_size; + ao_storage_config = ao_storage_total - ao_storage_block; + ao_storage_unit = ao_flash_block_size; + + ao_flash_setup_done = 1; + ao_mutex_put(&ao_flash_mutex); +} + +static void +ao_flash_wait_write(void) +{ + if (ao_flash_write_pending) { + for (;;) { + uint8_t status = ao_flash_read_status(); + if ((status & FLASH_STATUS_RDY)) + break; + } + ao_flash_write_pending = 0; + } +} + +/* Write the current block to the FLASHPROM */ +static void +ao_flash_write_block(void) +{ + ao_flash_wait_write(); + ao_flash_cs_low(); + ao_flash_instruction.instruction = FLASH_WRITE; + + /* 13/14 block bits + 9/8 byte bits (always 0) */ + ao_flash_instruction.address[0] = ao_flash_block >> (16 - ao_flash_block_shift); + ao_flash_instruction.address[1] = ao_flash_block << (ao_flash_block_shift - 8); + ao_flash_instruction.address[2] = 0; + ao_spi_send(&ao_flash_instruction, 4); + ao_spi_send(ao_flash_data, ao_storage_block); + ao_flash_cs_high(); + ao_flash_write_pending = 1; +} + +/* Read the current block from the FLASHPROM */ +static void +ao_flash_read_block(void) +{ + ao_flash_wait_write(); + ao_flash_cs_low(); + ao_flash_instruction.instruction = FLASH_READ; + + /* 13/14 block bits + 9/8 byte bits (always 0) */ + ao_flash_instruction.address[0] = ao_flash_block >> (16 - ao_flash_block_shift); + ao_flash_instruction.address[1] = ao_flash_block << (ao_flash_block_shift - 8); + ao_flash_instruction.address[2] = 0; + ao_spi_send(&ao_flash_instruction, 4); + ao_spi_recv(ao_flash_data, ao_flash_block_size); + ao_flash_cs_high(); +} + +static void +ao_flash_flush_internal(void) +{ + if (ao_flash_block_dirty) { + ao_flash_write_block(); + ao_flash_block_dirty = 0; + } +} + +static void +ao_flash_fill(uint16_t block) +{ + if (block != ao_flash_block) { + ao_flash_flush_internal(); + ao_flash_block = block; + ao_flash_read_block(); + } +} + +uint8_t +ao_storage_device_write(uint32_t pos, __xdata void *buf, uint16_t len) __reentrant +{ + uint16_t block = (uint16_t) (pos >> ao_flash_block_shift); + + /* Transfer the data */ + ao_mutex_get(&ao_flash_mutex); { + if (len != ao_flash_block_size) + ao_flash_fill(block); + else { + ao_flash_flush_internal(); + ao_flash_block = block; + } + memcpy(ao_flash_data + (uint16_t) (pos & ao_flash_block_mask), + buf, + len); + ao_flash_block_dirty = 1; + } ao_mutex_put(&ao_flash_mutex); + return 1; +} + +uint8_t +ao_storage_device_read(uint32_t pos, __xdata void *buf, uint16_t len) __reentrant +{ + uint16_t block = (uint16_t) (pos >> ao_flash_block_shift); + + /* Transfer the data */ + ao_mutex_get(&ao_flash_mutex); { + ao_flash_fill(block); + memcpy(buf, + ao_flash_data + (uint16_t) (pos & ao_flash_block_mask), + len); + } ao_mutex_put(&ao_flash_mutex); + return 1; +} + +void +ao_storage_flush(void) __reentrant +{ + ao_mutex_get(&ao_flash_mutex); { + ao_flash_flush_internal(); + } ao_mutex_put(&ao_flash_mutex); +} + +uint8_t +ao_storage_erase(uint32_t pos) __reentrant +{ + ao_mutex_get(&ao_flash_mutex); { + ao_flash_flush_internal(); + ao_flash_block = (uint16_t) (pos >> ao_flash_block_shift); + memset(ao_flash_data, 0xff, ao_flash_block_size); + ao_flash_block_dirty = 1; + } ao_mutex_put(&ao_flash_mutex); + return 1; +} + +void +ao_storage_device_info(void) __reentrant +{ + uint8_t status; + + ao_storage_setup(); + ao_mutex_get(&ao_flash_mutex); { + status = ao_flash_read_status(); + printf ("Flash status: 0x%02x\n", status); + printf ("Flash block shift: %d\n", ao_flash_block_shift); + printf ("Flash block size: %d\n", ao_flash_block_size); + printf ("Flash block mask: %d\n", ao_flash_block_mask); + printf ("Flash device size: %ld\n", ao_storage_total); + } ao_mutex_put(&ao_flash_mutex); +} + +/* + * To initialize the chip, set up the CS line and + * the SPI interface + */ +void +ao_storage_device_init(void) +{ + /* set up CS */ + FLASH_CS = 1; + P1DIR |= (1 << FLASH_CS_INDEX); + P1SEL &= ~(1 << FLASH_CS_INDEX); +} |