[feat] add boot2_copy_self

driver/inc/reg/ssi_reg.h

@@ -0,0 +1,50 @@
+#ifndef __HARDWARE_SSI_REG_H__
+#define __HARDWARE_SSI_REG_H__
+
+#include "reg.h"
+
+typedef struct {
+    io_rw_32 ctrlr0;
+    io_rw_32 ctrlr1;
+    io_rw_32 ssienr;
+    io_rw_32 mwcr;
+    io_rw_32 ser;
+    io_rw_32 baudr;
+    io_rw_32 txftlr;
+    io_rw_32 rxftlr;
+    io_rw_32 txflr;
+    io_rw_32 rxflr;
+    io_rw_32 sr;
+    io_rw_32 imr;
+    io_rw_32 isr;
+    io_rw_32 risr;
+    io_rw_32 txoicr;
+    io_rw_32 rxoicr;
+    io_rw_32 rxuicr;
+    io_rw_32 msticr;
+    io_rw_32 icr;
+    io_rw_32 dmacr;
+    io_rw_32 dmatdlr;
+    io_rw_32 dmardlr;
+    io_rw_32 idr;
+    io_rw_32 ssi_version_id;
+    io_rw_32 dr0;
+    uint32_t _pad[(0xf0 - 0x60) / 4 - 1];
+    io_rw_32 rx_sample_dly;
+    io_rw_32 spi_ctrlr0;
+    io_rw_32 txd_drive_edge;
+} ssi_hw_t;
+
+#define ssi_hw       ((ssi_hw_t *const)XIP_SSI_BASE)
+#define ssi_hw_set   ((ssi_hw_t *const)hw_set_alias_untyped(ssi_hw))
+#define ssi_hw_clear ((ssi_hw_t *const)hw_clear_alias_untyped(ssi_hw))
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __HARDWARE_SSI_REG_H__ */

example/boot2/boot2.ld

@@ -34,6 +34,7 @@ SECTIONS
     .text :
     {
         . = ALIGN(4);
+        _boot2_copy_self_start_addr = .;
         *(.text*)
         . = ALIGN(4);
     } >RAM AT > FLASH :text
@@ -52,6 +53,8 @@ SECTIONS
         . = ALIGN(4);
     } >RAM AT > FLASH :data
 
+    _boot2_copy_self_end_addr = .;
+
     .bss (NOLOAD) :
     {
         . = ALIGN(4);

example/boot2/boot2_pre.S

@@ -11,6 +11,7 @@ boot2_pre:
     msr msp, r0
     bl boot2_copy_self
     bl main
+    b .
     .word 0x11223344
     .word 0xabcdef58
 

example/boot2/main.c

@@ -1,6 +1,56 @@
+#include "gpio.h"
+#include "ssi_reg.h"
+
 void __attribute__((section(".text.boot2_pre"))) boot2_copy_self(void)
 {
-    return;
+    #define BOOT2_FLASHCMD_READ_DATA (0x03)
+    #define BOOT2_FLASH_OFFSET       (256)
+    extern uint32_t _boot2_copy_self_start_addr;
+    extern uint32_t _boot2_copy_self_end_addr;
+
+    io_rw_32 *reg;
+    uint32_t cmd;
+    uint32_t length, tx_count, rx_count, rx_skip;
+    uint8_t *copy_to_addr;
+    uint8_t rxbyte;
+
+    /* force QSPI_CS low level as selected */
+    reg = (io_rw_32 *)(IO_QSPI_BASE + GPIO_QSPI_CS_CTRL_OFFSET);
+    *reg = GPIO_OVER_OUT_FORCE_LOW << GPIO_OVER_OUT_POS;
+
+    /* send command and length */
+    cmd = (BOOT2_FLASHCMD_READ_DATA << 24) | BOOT2_FLASH_OFFSET;
+    for (int i = 0; i < 4; ++i) {
+        ssi_hw->dr0 = cmd >> 24;
+        cmd <<= 8;
+    }
+    /* init parameter */
+    length = (uint32_t)&_boot2_copy_self_end_addr - (uint32_t)&_boot2_copy_self_start_addr;
+    tx_count = length;
+    rx_count = length;
+    rx_skip = 4;
+    copy_to_addr = (uint8_t *)&_boot2_copy_self_start_addr;
+    /* copy data from flash to ram */
+    while (tx_count || rx_skip || rx_count) {
+        uint32_t tx_level = ssi_hw->txflr;
+        uint32_t rx_level = ssi_hw->rxflr;
+        if (tx_count && tx_level + rx_level < 14) {
+            ssi_hw->dr0 = 0;
+            tx_count--;
+        }
+        if (rx_level) {
+            rxbyte = ssi_hw->dr0;
+            if (rx_skip) {
+                rx_skip--;
+            } else {
+                *copy_to_addr++ = rxbyte;
+                rx_count--;
+            }
+        }
+    }
+
+    /* force QSPI_CS high level as disselected */
+    *reg = GPIO_OVER_OUT_FORCE_HIGH << GPIO_OVER_OUT_POS;
 }
 
 int main(void)