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-rw-r--r--openpicc/application/flash.c68
1 files changed, 68 insertions, 0 deletions
diff --git a/openpicc/application/flash.c b/openpicc/application/flash.c
new file mode 100644
index 0000000..c729ff8
--- /dev/null
+++ b/openpicc/application/flash.c
@@ -0,0 +1,68 @@
+#include <sys/types.h>
+#include <lib_AT91SAM7.h>
+#include <AT91SAM7.h>
+#include <dfu/dbgu.h>
+#include <board.h>
+
+#define EFCS_CMD_WRITE_PAGE 0x1
+#define EFCS_CMD_SET_LOCK_BIT 0x2
+#define EFCS_CMD_WRITE_PAGE_LOCK 0x3
+#define EFCS_CMD_CLEAR_LOCK 0x4
+#define EFCS_CMD_ERASE_ALL 0x8
+#define EFCS_CMD_SET_NVM_BIT 0xb
+#define EFCS_CMD_CLEAR_NVM_BIT 0xd
+#define EFCS_CMD_SET_SECURITY_BIT 0xf
+
+static u_int16_t page_from_ramaddr(const void *addr)
+{
+ u_int32_t ramaddr = (u_int32_t) addr;
+ ramaddr -= (u_int32_t) AT91C_IFLASH;
+ return ((ramaddr >> AT91C_IFLASH_PAGE_SHIFT));
+}
+#define PAGES_PER_LOCKREGION (AT91C_IFLASH_LOCK_REGION_SIZE>>AT91C_IFLASH_PAGE_SHIFT)
+#define IS_FIRST_PAGE_OF_LOCKREGION(x) ((x % PAGES_PER_LOCKREGION) == 0)
+#define LOCKREGION_FROM_PAGE(x) (x / PAGES_PER_LOCKREGION)
+
+static int is_page_locked(u_int16_t page)
+{
+ u_int16_t lockregion = LOCKREGION_FROM_PAGE(page);
+
+ return (AT91C_BASE_MC->MC_FSR & (lockregion << 16));
+}
+
+static void unlock_page(u_int16_t page)
+{
+ page &= 0x3ff;
+ AT91F_MC_EFC_PerformCmd(AT91C_BASE_MC, AT91C_MC_FCMD_UNLOCK |
+ AT91C_MC_CORRECT_KEY | (page << 8));
+}
+
+void flash_page(u_int8_t *addr)
+{
+ u_int16_t page = page_from_ramaddr(addr) & 0x3ff;
+ u_int32_t fsr = AT91F_MC_EFC_GetStatus(AT91C_BASE_MC);
+ DEBUGP("flash_page(0x%x=%u) ", addr, page);
+
+ if (is_page_locked(page)) {
+ DEBUGP("unlocking ");
+ unlock_page(page);
+ }
+
+ if (!(fsr & AT91C_MC_FRDY)) {
+ DEBUGP("NOT_FLASHING ");
+ return;
+ }
+
+ DEBUGP("performing start_prog ");
+
+ AT91F_MC_EFC_PerformCmd(AT91C_BASE_MC, AT91C_MC_FCMD_START_PROG |
+ AT91C_MC_CORRECT_KEY | (page << 8));
+}
+
+void flash_init(void)
+{
+ unsigned int fmcn = AT91F_MC_EFC_ComputeFMCN(MCK);
+
+ AT91F_MC_EFC_CfgModeReg(AT91C_BASE_MC, (fmcn&0xff) << 16 |
+ AT91C_MC_FWS_3FWS);
+}
personal git repositories of Harald Welte. Your mileage may vary