Remove unnecessary code from SC64 flashcart module

src/flashcart/flashcart_utils.c

@@ -1,3 +1,5 @@
+#include <libdragon.h>
+
 #include "flashcart_utils.h"
 #include "utils/fs.h"
 #include "utils/utils.h"
@@ -9,3 +11,19 @@ void fix_file_size (FIL *fil) {
     //       Sending some extra bytes isn't an issue here.
     fil->obj.objsize = ALIGN(f_size(fil), FS_SECTOR_SIZE);
 }
+
+void pi_dma_read_data (void *src, void *dst, size_t length) {
+    data_cache_hit_writeback_invalidate(dst, length);
+    dma_read_async(dst, (uint32_t) (src), length);
+    dma_wait();
+}
+
+void pi_dma_write_data (void *src, void *dst, size_t length) {
+    assert((((uint32_t) (src)) & 0x07) == 0);
+    assert((((uint32_t) (dst)) & 0x01) == 0);
+    assert((length & 1) == 0);
+
+    data_cache_hit_writeback(src, length);
+    dma_write_raw_async(src, (uint32_t) (dst), length);
+    dma_wait();
+}

src/flashcart/flashcart_utils.h

@@ -12,6 +12,8 @@
 
 
 void fix_file_size (FIL *fil);
+void pi_dma_read_data (void *src, void *dst, size_t length);
+void pi_dma_write_data (void *src, void *dst, size_t length);
 
 
 #endif

src/flashcart/sc64/sc64.c

@@ -55,13 +55,9 @@ static flashcart_error_t load_to_flash (FIL *fil, void *address, size_t size, UI
 static flashcart_error_t sc64_init (void) {
     uint16_t major;
     uint16_t minor;
+    uint32_t revision;
 
-    sc64_unlock();
-
-    if (!sc64_check_presence()) {
-        return FLASHCART_ERROR_UNSUPPORTED;
-    }
-    if (sc64_get_version(&major, &minor) != SC64_OK) {
+    if (sc64_get_version(&major, &minor, &revision) != SC64_OK) {
         return FLASHCART_ERROR_OUTDATED;
     }
     if (major != SUPPORTED_MAJOR_VERSION) {
@@ -192,12 +188,14 @@ static flashcart_error_t sc64_load_rom (char *rom_path) {
 
 static flashcart_error_t sc64_load_save (char *save_path) {
     void *address = NULL;
-    sc64_save_type_t type;
+    uint32_t value;
 
-    if (sc64_get_config(CFG_SAVE_TYPE, &type) != SC64_OK) {
+    if (sc64_get_config(CFG_SAVE_TYPE, &value) != SC64_OK) {
         return FLASHCART_ERROR_INT;
     }
 
+    sc64_save_type_t type = (sc64_save_type_t) (value);
+
     switch (type) {
         case SAVE_TYPE_EEPROM_4K:
         case SAVE_TYPE_EEPROM_16K:
@@ -275,7 +273,7 @@ static flashcart_error_t sc64_set_save_type (flashcart_save_type_t save_type) {
 }
 
 static flashcart_error_t sc64_set_save_writeback (uint32_t *sectors) {
-    sc64_write_data(sectors, SC64_BUFFERS->BUFFER, 1024);
+    pi_dma_write_data(sectors, SC64_BUFFERS->BUFFER, 1024);
 
     if (sc64_writeback_enable(SC64_BUFFERS->BUFFER) != SC64_OK) {
         return FLASHCART_ERROR_INT;

src/flashcart/sc64/sc64_internal.c

@@ -13,15 +13,9 @@ typedef struct {
 #define SC64_REGS_BASE          (0x1FFF0000UL)
 #define SC64_REGS               ((sc64_regs_t *) SC64_REGS_BASE)
 
-#define SC64_SR_IRQ_PENDING     (1 << 29)
 #define SC64_SR_CMD_ERROR       (1 << 30)
 #define SC64_SR_CPU_BUSY        (1 << 31)
 
-#define SC64_V2_IDENTIFIER      (0x53437632)
-
-#define SC64_KEY_RESET          (0x00000000UL)
-#define SC64_KEY_UNLOCK_1       (0x5F554E4CUL)
-#define SC64_KEY_UNLOCK_2       (0x4F434B5FUL)
 #define SC64_KEY_LOCK           (0xFFFFFFFFUL)
 
 
@@ -29,23 +23,12 @@ typedef enum {
     CMD_ID_VERSION_GET          = 'V',
     CMD_ID_CONFIG_GET           = 'c',
     CMD_ID_CONFIG_SET           = 'C',
-    CMD_ID_SD_CARD_OP           = 'i',
     CMD_ID_WRITEBACK_PENDING    = 'w',
     CMD_ID_WRITEBACK_SD_INFO    = 'W',
-    CMD_ID_FLASH_PROGRAM        = 'K',
     CMD_ID_FLASH_WAIT_BUSY      = 'p',
     CMD_ID_FLASH_ERASE_BLOCK    = 'P',
 } sc64_cmd_id_t;
 
-typedef enum {
-    SD_CARD_OP_DEINIT           = 0,
-    SD_CARD_OP_INIT             = 1,
-    SD_CARD_OP_GET_STATUS       = 2,
-    SD_CARD_OP_GET_INFO         = 3,
-    SD_CARD_OP_BYTE_SWAP_ON     = 4,
-    SD_CARD_OP_BYTE_SWAP_OFF    = 5,
-} sc64_sd_card_op_t;
-
 typedef struct {
     sc64_cmd_id_t id;
     uint32_t arg[2];
@@ -75,90 +58,78 @@ static sc64_error_t sc64_execute_cmd (sc64_cmd_t *cmd) {
 }
 
 
-void sc64_unlock (void) {
-    io_write((uint32_t) (&SC64_REGS->KEY), SC64_KEY_RESET);
-    io_write((uint32_t) (&SC64_REGS->KEY), SC64_KEY_UNLOCK_1);
-    io_write((uint32_t) (&SC64_REGS->KEY), SC64_KEY_UNLOCK_2);
-}
-
 void sc64_lock (void) {
     io_write((uint32_t) (&SC64_REGS->KEY), SC64_KEY_LOCK);
 }
 
-bool sc64_check_presence (void) {
-    return (io_read((uint32_t) (&SC64_REGS->IDENTIFIER)) == SC64_V2_IDENTIFIER);
-}
-
-void sc64_read_data (void *src, void *dst, size_t length) {
-    data_cache_hit_writeback_invalidate(dst, length);
-    dma_read_raw_async(dst, (uint32_t) (src), length);
-    dma_wait();
-}
-
-void sc64_write_data (void *src, void *dst, size_t length) {
-    data_cache_hit_writeback(src, length);
-    dma_write_raw_async(src, (uint32_t) (dst), length);
-    dma_wait();
-}
-
-sc64_error_t sc64_get_version (uint16_t *major, uint16_t *minor) {
-    sc64_cmd_t cmd = { .id = CMD_ID_VERSION_GET };
+sc64_error_t sc64_get_version (uint16_t *major, uint16_t *minor, uint32_t *revision) {
+    sc64_cmd_t cmd = {
+        .id = CMD_ID_VERSION_GET
+    };
     sc64_error_t error = sc64_execute_cmd(&cmd);
     *major = ((cmd.rsp[0] >> 16) & 0xFFFF);
     *minor = (cmd.rsp[0] & 0xFFFF);
+    *revision = cmd.rsp[1];
     return error;
 }
 
-sc64_error_t sc64_get_config (sc64_cfg_t id, void *value) {
-    sc64_cmd_t cmd = { .id = CMD_ID_CONFIG_GET, .arg = { id } };
+sc64_error_t sc64_get_config (sc64_cfg_t id, uint32_t *value) {
+    sc64_cmd_t cmd = {
+        .id = CMD_ID_CONFIG_GET,
+        .arg = { id }
+    };
     sc64_error_t error = sc64_execute_cmd(&cmd);
-    *((uint32_t *) (value)) = cmd.rsp[1];
+    *value = cmd.rsp[1];
     return error;
 }
 
 sc64_error_t sc64_set_config (sc64_cfg_t id, uint32_t value) {
-    sc64_cmd_t cmd = { .id = CMD_ID_CONFIG_SET, .arg = { id, value } };
-    return sc64_execute_cmd(&cmd);
-}
-
-sc64_error_t sc64_sd_set_byte_swap (bool enabled) {
     sc64_cmd_t cmd = {
-        .id = CMD_ID_SD_CARD_OP,
-        .arg = { 0, enabled ? SD_CARD_OP_BYTE_SWAP_ON : SD_CARD_OP_BYTE_SWAP_OFF }
+        .id = CMD_ID_CONFIG_SET,
+        .arg = { id, value }
     };
     return sc64_execute_cmd(&cmd);
 }
 
 sc64_error_t sc64_writeback_pending (bool *pending) {
-    sc64_cmd_t cmd = { .id = CMD_ID_WRITEBACK_PENDING };
+    sc64_cmd_t cmd = {
+        .id = CMD_ID_WRITEBACK_PENDING
+    };
     sc64_error_t error = sc64_execute_cmd(&cmd);
     *pending = (cmd.rsp[0] != 0);
     return error;
 }
 
 sc64_error_t sc64_writeback_enable (void *address) {
-    sc64_cmd_t cmd = { .id = CMD_ID_WRITEBACK_SD_INFO, .arg = { (uint32_t) (address) } };
-    return sc64_execute_cmd(&cmd);
-}
-
-sc64_error_t sc64_flash_program (void *address, size_t length) {
-    sc64_cmd_t cmd = { .id = CMD_ID_FLASH_PROGRAM, .arg = { (uint32_t) (address), length } };
+    sc64_cmd_t cmd = {
+        .id = CMD_ID_WRITEBACK_SD_INFO,
+        .arg = { (uint32_t) (address) }
+    };
     return sc64_execute_cmd(&cmd);
 }
 
 sc64_error_t sc64_flash_wait_busy (void) {
-    sc64_cmd_t cmd = { .id = CMD_ID_FLASH_WAIT_BUSY, .arg = { true } };
+    sc64_cmd_t cmd = {
+        .id = CMD_ID_FLASH_WAIT_BUSY,
+        .arg = { true }
+    };
     return sc64_execute_cmd(&cmd);
 }
 
 sc64_error_t sc64_flash_get_erase_block_size (size_t *erase_block_size) {
-    sc64_cmd_t cmd = { .id = CMD_ID_FLASH_WAIT_BUSY, .arg = { false } };
+    sc64_cmd_t cmd = {
+        .id = CMD_ID_FLASH_WAIT_BUSY,
+        .arg = { false }
+    };
     sc64_error_t error = sc64_execute_cmd(&cmd);
     *erase_block_size = (size_t) (cmd.rsp[0]);
     return error;
 }
 
 sc64_error_t sc64_flash_erase_block (void *address) {
-    sc64_cmd_t cmd = { .id = CMD_ID_FLASH_ERASE_BLOCK, .arg = { (uint32_t) (address) } };
+    sc64_cmd_t cmd = {
+        .id = CMD_ID_FLASH_ERASE_BLOCK,
+        .arg = { (uint32_t) (address) }
+    };
     return sc64_execute_cmd(&cmd);
 }

src/flashcart/sc64/sc64_internal.h

@@ -110,18 +110,12 @@ typedef enum {
 } sc64_button_mode_t;
 
 
-void sc64_unlock (void);
 void sc64_lock (void);
-bool sc64_check_presence (void);
-void sc64_read_data (void *src, void *dst, size_t length);
-void sc64_write_data (void *src, void *dst, size_t length);
-sc64_error_t sc64_get_version (uint16_t *major, uint16_t *minor);
-sc64_error_t sc64_get_config (sc64_cfg_t cfg, void *value);
+sc64_error_t sc64_get_version (uint16_t *major, uint16_t *minor, uint32_t *revision);
+sc64_error_t sc64_get_config (sc64_cfg_t cfg, uint32_t *value);
 sc64_error_t sc64_set_config (sc64_cfg_t cfg, uint32_t value);
-sc64_error_t sc64_sd_set_byte_swap (bool enabled);
 sc64_error_t sc64_writeback_pending (bool *pending);
 sc64_error_t sc64_writeback_enable (void *address);
-sc64_error_t sc64_flash_program (void *address, size_t length);
 sc64_error_t sc64_flash_wait_busy (void);
 sc64_error_t sc64_flash_get_erase_block_size (size_t *erase_block_size);
 sc64_error_t sc64_flash_erase_block (void *address);