add circuitpython code

1 files changed, 227 insertions, 0 deletions

diff --git a/circuitpython/supervisor/shared/flash.c b/circuitpython/supervisor/shared/flash.c
new file mode 100644
index 0000000..dfd7cf2
--- /dev/null
+++ b/circuitpython/supervisor/shared/flash.c
@@ -0,0 +1,227 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2018 Scott Shawcroft
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#include "supervisor/flash.h"
+
+#include "extmod/vfs_fat.h"
+#include "py/runtime.h"
+#include "lib/oofatfs/ff.h"
+#include "supervisor/flash.h"
+#include "supervisor/shared/tick.h"
+
+#define VFS_INDEX 0
+
+#define PART1_START_BLOCK (0x1)
+
+// there is a singleton Flash object
+const mp_obj_type_t supervisor_flash_type;
+STATIC const mp_obj_base_t supervisor_flash_obj = {&supervisor_flash_type};
+
+STATIC mp_obj_t supervisor_flash_obj_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *args) {
+    // check arguments
+    mp_arg_check_num(n_args, n_kw, 0, 0, false);
+
+    // return singleton object
+    return (mp_obj_t)&supervisor_flash_obj;
+}
+
+static uint32_t flash_get_block_count(void) {
+    return PART1_START_BLOCK + supervisor_flash_get_block_count();
+}
+
+static void build_partition(uint8_t *buf, int boot, int type, uint32_t start_block, uint32_t num_blocks) {
+    buf[0] = boot;
+
+    if (num_blocks == 0) {
+        buf[1] = 0;
+        buf[2] = 0;
+        buf[3] = 0;
+    } else {
+        buf[1] = 0xff;
+        buf[2] = 0xff;
+        buf[3] = 0xff;
+    }
+
+    buf[4] = type;
+
+    if (num_blocks == 0) {
+        buf[5] = 0;
+        buf[6] = 0;
+        buf[7] = 0;
+    } else {
+        buf[5] = 0xff;
+        buf[6] = 0xff;
+        buf[7] = 0xff;
+    }
+
+    buf[8] = start_block;
+    buf[9] = start_block >> 8;
+    buf[10] = start_block >> 16;
+    buf[11] = start_block >> 24;
+
+    buf[12] = num_blocks;
+    buf[13] = num_blocks >> 8;
+    buf[14] = num_blocks >> 16;
+    buf[15] = num_blocks >> 24;
+}
+
+static mp_uint_t flash_read_blocks(uint8_t *dest, uint32_t block_num, uint32_t num_blocks) {
+    if (block_num == 0) {
+        // fake the MBR so we can decide on our own partition table
+
+        for (int i = 0; i < 446; i++) {
+            dest[i] = 0;
+        }
+
+        build_partition(dest + 446, 0, 0x01 /* FAT12 */, PART1_START_BLOCK, supervisor_flash_get_block_count());
+        build_partition(dest + 462, 0, 0, 0, 0);
+        build_partition(dest + 478, 0, 0, 0, 0);
+        build_partition(dest + 494, 0, 0, 0, 0);
+
+        dest[510] = 0x55;
+        dest[511] = 0xaa;
+        if (num_blocks > 1) {
+            dest += 512;
+            num_blocks -= 1;
+            // Fall through and do a read from flash.
+        } else {
+            return 0; // Done and ok.
+        }
+    }
+    return supervisor_flash_read_blocks(dest, block_num - PART1_START_BLOCK, num_blocks);
+}
+
+static volatile bool filesystem_dirty = false;
+
+static mp_uint_t flash_write_blocks(const uint8_t *src, uint32_t block_num, uint32_t num_blocks) {
+    if (block_num == 0) {
+        if (num_blocks > 1) {
+            return 1; // error
+        }
+        // can't write MBR, but pretend we did
+        return 0;
+    } else {
+        if (!filesystem_dirty) {
+            // Turn on ticks so that we can flush after a period of time elapses.
+            supervisor_enable_tick();
+            filesystem_dirty = true;
+        }
+        return supervisor_flash_write_blocks(src, block_num - PART1_START_BLOCK, num_blocks);
+    }
+}
+
+void supervisor_flash_flush(void) {
+    #if INTERNAL_FLASH_FILESYSTEM
+    port_internal_flash_flush();
+    #else
+    supervisor_external_flash_flush();
+    #endif
+    // Turn off ticks now that our filesystem has been flushed.
+    if (filesystem_dirty) {
+        supervisor_disable_tick();
+    }
+    filesystem_dirty = false;
+}
+
+STATIC mp_obj_t supervisor_flash_obj_readblocks(mp_obj_t self, mp_obj_t block_num, mp_obj_t buf) {
+    mp_buffer_info_t bufinfo;
+    mp_get_buffer_raise(buf, &bufinfo, MP_BUFFER_WRITE);
+    mp_uint_t ret = flash_read_blocks(bufinfo.buf, mp_obj_get_int(block_num), bufinfo.len / FILESYSTEM_BLOCK_SIZE);
+    return MP_OBJ_NEW_SMALL_INT(ret);
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_3(supervisor_flash_obj_readblocks_obj, supervisor_flash_obj_readblocks);
+
+STATIC mp_obj_t supervisor_flash_obj_writeblocks(mp_obj_t self, mp_obj_t block_num, mp_obj_t buf) {
+    mp_buffer_info_t bufinfo;
+    mp_get_buffer_raise(buf, &bufinfo, MP_BUFFER_READ);
+    mp_uint_t ret = flash_write_blocks(bufinfo.buf, mp_obj_get_int(block_num), bufinfo.len / FILESYSTEM_BLOCK_SIZE);
+    return MP_OBJ_NEW_SMALL_INT(ret);
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_3(supervisor_flash_obj_writeblocks_obj, supervisor_flash_obj_writeblocks);
+
+static bool flash_ioctl(size_t cmd, mp_int_t *out_value) {
+    *out_value = 0;
+    switch (cmd) {
+        case MP_BLOCKDEV_IOCTL_INIT:
+            supervisor_flash_init();
+            break;
+        case MP_BLOCKDEV_IOCTL_DEINIT:
+            supervisor_flash_flush();
+            break; // TODO properly
+        case MP_BLOCKDEV_IOCTL_SYNC:
+            supervisor_flash_flush();
+            break;
+        case MP_BLOCKDEV_IOCTL_BLOCK_COUNT:
+            *out_value = flash_get_block_count();
+            break;
+        case MP_BLOCKDEV_IOCTL_BLOCK_SIZE:
+            *out_value = supervisor_flash_get_block_size();
+            break;
+        default:
+            return false;
+    }
+    return true;
+}
+
+STATIC mp_obj_t supervisor_flash_obj_ioctl(mp_obj_t self, mp_obj_t cmd_in, mp_obj_t arg_in) {
+    mp_int_t cmd = mp_obj_get_int(cmd_in);
+    mp_int_t out_value;
+    if (flash_ioctl(cmd, &out_value)) {
+        return MP_OBJ_NEW_SMALL_INT(out_value);
+    }
+    return mp_const_none;
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_3(supervisor_flash_obj_ioctl_obj, supervisor_flash_obj_ioctl);
+
+STATIC const mp_rom_map_elem_t supervisor_flash_obj_locals_dict_table[] = {
+    { MP_ROM_QSTR(MP_QSTR_readblocks), MP_ROM_PTR(&supervisor_flash_obj_readblocks_obj) },
+    { MP_ROM_QSTR(MP_QSTR_writeblocks), MP_ROM_PTR(&supervisor_flash_obj_writeblocks_obj) },
+    { MP_ROM_QSTR(MP_QSTR_ioctl), MP_ROM_PTR(&supervisor_flash_obj_ioctl_obj) },
+};
+
+STATIC MP_DEFINE_CONST_DICT(supervisor_flash_obj_locals_dict, supervisor_flash_obj_locals_dict_table);
+
+const mp_obj_type_t supervisor_flash_type = {
+    { &mp_type_type },
+    .name = MP_QSTR_Flash,
+    .make_new = supervisor_flash_obj_make_new,
+    .locals_dict = (struct _mp_obj_dict_t *)&supervisor_flash_obj_locals_dict,
+};
+
+void supervisor_flash_init_vfs(fs_user_mount_t *vfs) {
+    vfs->base.type = &mp_fat_vfs_type;
+    vfs->blockdev.flags |= MP_BLOCKDEV_FLAG_NATIVE | MP_BLOCKDEV_FLAG_HAVE_IOCTL;
+    vfs->fatfs.drv = vfs;
+    vfs->fatfs.part = 1; // flash filesystem lives on first fake partition
+    vfs->blockdev.readblocks[0] = (mp_obj_t)&supervisor_flash_obj_readblocks_obj;
+    vfs->blockdev.readblocks[1] = (mp_obj_t)&supervisor_flash_obj;
+    vfs->blockdev.readblocks[2] = (mp_obj_t)flash_read_blocks; // native version
+    vfs->blockdev.writeblocks[0] = (mp_obj_t)&supervisor_flash_obj_writeblocks_obj;
+    vfs->blockdev.writeblocks[1] = (mp_obj_t)&supervisor_flash_obj;
+    vfs->blockdev.writeblocks[2] = (mp_obj_t)flash_write_blocks; // native version
+    vfs->blockdev.u.ioctl[0] = (mp_obj_t)&supervisor_flash_obj_ioctl_obj;
+    vfs->blockdev.u.ioctl[1] = (mp_obj_t)&supervisor_flash_obj;
+    vfs->blockdev.u.ioctl[2] = (mp_obj_t)flash_ioctl; // native version
+}