--- /dev/null
+/*
+ * 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);
+}
projects / fw / altos / blobdiff