Implement RP2350 initialization clocks, uart, and (partial) USB support

src/machine/machine_rp2.go

@@ -13,9 +13,8 @@ const deviceName = rp.Device
 
 const (
 	// Number of spin locks available
-	_NUMSPINLOCKS = 32
-	// Number of interrupt handlers available
-	_NUMIRQ               = 32
+	// Note: On RP2350, most spinlocks are unusable due to Errata 2
+	_NUMSPINLOCKS         = 32
 	_PICO_SPINLOCK_ID_IRQ = 9
 )
 
@@ -45,12 +44,7 @@ func machineInit() {
 	// except for QSPI pads and the XIP IO bank, as this is fatal if running from flash
 	// and the PLLs, as this is fatal if clock muxing has not been reset on this boot
 	// and USB, syscfg, as this disturbs USB-to-SWD on core 1
-	bits := ^uint32(rp.RESETS_RESET_IO_QSPI |
-		rp.RESETS_RESET_PADS_QSPI |
-		rp.RESETS_RESET_PLL_USB |
-		rp.RESETS_RESET_USBCTRL |
-		rp.RESETS_RESET_SYSCFG |
-		rp.RESETS_RESET_PLL_SYS)
+	bits := ^uint32(initDontReset)
 	resetBlock(bits)
 
 	// Remove reset from peripherals which are clocked only by clkSys and

src/machine/machine_rp2040_rtc.go

@@ -97,7 +97,7 @@ func toAlarmTime(delay uint32) rtcTime {
 
 func (rtc *rtcType) setDivider() {
 	// Get clk_rtc freq and make sure it is running
-	rtcFreq := configuredFreq[clkRTC]
+	rtcFreq := configuredFreq[ClkRTC]
 	if rtcFreq == 0 {
 		panic("can not set RTC divider, clock is not running")
 	}

src/machine/machine_rp2350_rom.go

@@ -0,0 +1,153 @@
+//go:build tinygo && rp2350
+
+package machine
+
+import ()
+
+/*
+typedef unsigned char uint8_t;
+typedef unsigned short uint16_t;
+typedef unsigned long uint32_t;
+typedef unsigned long size_t;
+typedef unsigned long uintptr_t;
+
+#define false 0
+#define true 1
+typedef int bool;
+
+// https://github.com/raspberrypi/pico-sdk
+// src/rp2_common/pico_platform_compiler/include/pico/platform/compiler.h
+
+#define pico_default_asm_volatile(...) __asm volatile (".syntax unified\n" __VA_ARGS__)
+
+
+// https://github.com/raspberrypi/pico-sdk
+// src/rp2350/pico_platform/include/pico/platform.h
+
+static bool pico_processor_state_is_nonsecure(void) {
+//    // todo add a define to disable NS checking at all?
+//    // IDAU-Exempt addresses return S=1 when tested in the Secure state,
+//    // whereas executing a tt in the NonSecure state will always return S=0.
+//    uint32_t tt;
+//    pico_default_asm_volatile (
+//        "movs %0, #0\n"
+//        "tt %0, %0\n"
+//        : "=r" (tt) : : "cc"
+//    );
+//    return !(tt & (1u << 22));
+
+    return false;
+}
+
+
+// https://github.com/raspberrypi/pico-sdk
+// src/rp2_common/pico_bootrom/include/pico/bootrom_constants.h
+
+// RP2040 & RP2350
+#define ROM_DATA_SOFTWARE_GIT_REVISION          ROM_TABLE_CODE('G', 'R')
+#define ROM_FUNC_FLASH_ENTER_CMD_XIP            ROM_TABLE_CODE('C', 'X')
+#define ROM_FUNC_FLASH_EXIT_XIP                 ROM_TABLE_CODE('E', 'X')
+#define ROM_FUNC_FLASH_FLUSH_CACHE              ROM_TABLE_CODE('F', 'C')
+#define ROM_FUNC_CONNECT_INTERNAL_FLASH         ROM_TABLE_CODE('I', 'F')
+#define ROM_FUNC_FLASH_RANGE_ERASE              ROM_TABLE_CODE('R', 'E')
+#define ROM_FUNC_FLASH_RANGE_PROGRAM            ROM_TABLE_CODE('R', 'P')
+
+// RP2350 only
+#define ROM_FUNC_PICK_AB_PARTITION              ROM_TABLE_CODE('A', 'B')
+#define ROM_FUNC_CHAIN_IMAGE                    ROM_TABLE_CODE('C', 'I')
+#define ROM_FUNC_EXPLICIT_BUY                   ROM_TABLE_CODE('E', 'B')
+#define ROM_FUNC_FLASH_RUNTIME_TO_STORAGE_ADDR  ROM_TABLE_CODE('F', 'A')
+#define ROM_DATA_FLASH_DEVINFO16_PTR            ROM_TABLE_CODE('F', 'D')
+#define ROM_FUNC_FLASH_OP                       ROM_TABLE_CODE('F', 'O')
+#define ROM_FUNC_GET_B_PARTITION                ROM_TABLE_CODE('G', 'B')
+#define ROM_FUNC_GET_PARTITION_TABLE_INFO       ROM_TABLE_CODE('G', 'P')
+#define ROM_FUNC_GET_SYS_INFO                   ROM_TABLE_CODE('G', 'S')
+#define ROM_FUNC_GET_UF2_TARGET_PARTITION       ROM_TABLE_CODE('G', 'U')
+#define ROM_FUNC_LOAD_PARTITION_TABLE           ROM_TABLE_CODE('L', 'P')
+#define ROM_FUNC_OTP_ACCESS                     ROM_TABLE_CODE('O', 'A')
+#define ROM_DATA_PARTITION_TABLE_PTR            ROM_TABLE_CODE('P', 'T')
+#define ROM_FUNC_FLASH_RESET_ADDRESS_TRANS      ROM_TABLE_CODE('R', 'A')
+#define ROM_FUNC_REBOOT                         ROM_TABLE_CODE('R', 'B')
+#define ROM_FUNC_SET_ROM_CALLBACK               ROM_TABLE_CODE('R', 'C')
+#define ROM_FUNC_SECURE_CALL                    ROM_TABLE_CODE('S', 'C')
+#define ROM_FUNC_SET_NS_API_PERMISSION          ROM_TABLE_CODE('S', 'P')
+#define ROM_FUNC_BOOTROM_STATE_RESET            ROM_TABLE_CODE('S', 'R')
+#define ROM_FUNC_SET_BOOTROM_STACK              ROM_TABLE_CODE('S', 'S')
+#define ROM_DATA_SAVED_XIP_SETUP_FUNC_PTR       ROM_TABLE_CODE('X', 'F')
+#define ROM_FUNC_FLASH_SELECT_XIP_READ_MODE     ROM_TABLE_CODE('X', 'M')
+#define ROM_FUNC_VALIDATE_NS_BUFFER             ROM_TABLE_CODE('V', 'B')
+
+#define BOOTSEL_FLAG_GPIO_PIN_SPECIFIED         0x20
+
+#define BOOTROM_FUNC_TABLE_OFFSET 0x14
+
+// todo remove this (or #ifdef it for A1/A2)
+#define BOOTROM_IS_A2() ((*(volatile uint8_t *)0x13) == 2)
+#define BOOTROM_WELL_KNOWN_PTR_SIZE (BOOTROM_IS_A2() ? 2 : 4)
+
+#define BOOTROM_VTABLE_OFFSET 0x00
+#define BOOTROM_TABLE_LOOKUP_OFFSET     (BOOTROM_FUNC_TABLE_OFFSET + BOOTROM_WELL_KNOWN_PTR_SIZE)
+
+// https://github.com/raspberrypi/pico-sdk
+// src/common/boot_picoboot_headers/include/boot/picoboot_constants.h
+
+// values 0-7 are secure/non-secure
+#define REBOOT2_FLAG_REBOOT_TYPE_NORMAL       0x0 // param0 = diagnostic partition
+#define REBOOT2_FLAG_REBOOT_TYPE_BOOTSEL      0x2 // param0 = bootsel_flags, param1 = gpio_config
+#define REBOOT2_FLAG_REBOOT_TYPE_RAM_IMAGE    0x3 // param0 = image_base, param1 = image_end
+#define REBOOT2_FLAG_REBOOT_TYPE_FLASH_UPDATE 0x4 // param0 = update_base
+
+#define REBOOT2_FLAG_NO_RETURN_ON_SUCCESS    0x100
+
+#define RT_FLAG_FUNC_ARM_SEC    0x0004
+#define RT_FLAG_FUNC_ARM_NONSEC 0x0010
+
+// https://github.com/raspberrypi/pico-sdk
+// src/rp2_common/pico_bootrom/include/pico/bootrom.h
+
+#define ROM_TABLE_CODE(c1, c2) ((c1) | ((c2) << 8))
+
+typedef void *(*rom_table_lookup_fn)(uint32_t code, uint32_t mask);
+
+__attribute__((always_inline))
+static void *rom_func_lookup_inline(uint32_t code) {
+    rom_table_lookup_fn rom_table_lookup = (rom_table_lookup_fn) (uintptr_t)*(uint16_t*)(BOOTROM_TABLE_LOOKUP_OFFSET);
+    if (pico_processor_state_is_nonsecure()) {
+        return rom_table_lookup(code, RT_FLAG_FUNC_ARM_NONSEC);
+    } else {
+        return rom_table_lookup(code, RT_FLAG_FUNC_ARM_SEC);
+    }
+}
+
+
+typedef int (*rom_reboot_fn)(uint32_t flags, uint32_t delay_ms, uint32_t p0, uint32_t p1);
+
+__attribute__((always_inline))
+int rom_reboot(uint32_t flags, uint32_t delay_ms, uint32_t p0, uint32_t p1) {
+    rom_reboot_fn func = (rom_reboot_fn) rom_func_lookup_inline(ROM_FUNC_REBOOT);
+    return func(flags, delay_ms, p0, p1);
+}
+
+
+// https://github.com/raspberrypi/pico-sdk
+// src/rp2_common/pico_bootrom/bootrom.c
+
+
+void reset_usb_boot(uint32_t usb_activity_gpio_pin_mask, uint32_t disable_interface_mask) {
+    uint32_t flags = disable_interface_mask;
+    if (usb_activity_gpio_pin_mask) {
+        flags |= BOOTSEL_FLAG_GPIO_PIN_SPECIFIED;
+        // the parameter is actually the gpio number, but we only care if BOOTSEL_FLAG_GPIO_PIN_SPECIFIED
+        usb_activity_gpio_pin_mask = (uint32_t)__builtin_ctz(usb_activity_gpio_pin_mask);
+    }
+    rom_reboot(REBOOT2_FLAG_REBOOT_TYPE_BOOTSEL | REBOOT2_FLAG_NO_RETURN_ON_SUCCESS, 10, flags, usb_activity_gpio_pin_mask);
+    __builtin_unreachable();
+}
+
+
+*/
+import "C"
+
+func enterBootloader() {
+	C.reset_usb_boot(0, 0)
+}