enable emmcio module on SP-1 and add frozen libs

.gitmodules

@@ -424,3 +424,9 @@
 [submodule "frozen/Adafruit_CircuitPython_BLE_File_Transfer"]
 	path = frozen/Adafruit_CircuitPython_BLE_File_Transfer
 	url = https://github.com/adafruit/Adafruit_CircuitPython_BLE_File_Transfer.git
+[submodule "frozen/Adafruit_CircuitPython_CS42L42"]
+	path = frozen/Adafruit_CircuitPython_CS42L42
+	url = https://github.com/adafruit/Adafruit_CircuitPython_CS42L42.git
+[submodule "frozen/Adafruit_CircuitPython_TAS2505"]
+	path = frozen/Adafruit_CircuitPython_TAS2505
+	url = https://github.com/adafruit/Adafruit_CircuitPython_TAS2505.git

ports/nordic/boards/teenage_engineering_sp1/board.c

@@ -25,16 +25,19 @@
 #include "board.h"
 #include "common-hal/microcontroller/Pin.h"
 #include "flash_protect.h"
+#include "peripherals/nrf/pins.h"
 #include "power_off.h"
 #include "py/misc.h"
 #include "supervisor/shared/safe_mode.h"
+#include "shared-module/emmcio/__init__.h"
 #include "wdt.h"
 #include "nrfx/drivers/include/nrfx_rtc.h"
 #include "nrfx/hal/nrf_gpio.h"
 
+#define PIN_EMMC_RESET      (DEFAULT_EMMC_RESET->number)   // active low
+#define PIN_EMMC_VCCQ_EN    (DEFAULT_EMMC_VCCQ->number)    // eMMC I/O rail
+
 // Pins this file drives directly.
-#define PIN_EMMC_RESET      NRF_GPIO_PIN_MAP(1, 8)   // eMMC, active low
-#define PIN_EMMC_VCCQ_EN    NRF_GPIO_PIN_MAP(0, 14)  // eMMC I/O rail
 #define PIN_OSC_EN          NRF_GPIO_PIN_MAP(0, 13)  // 3.072 MHz oscillator
 #define PIN_TAS_RESET       NRF_GPIO_PIN_MAP(0, 9)   // TAS2505, active low
 #define PIN_CS42_RESET      NRF_GPIO_PIN_MAP(0, 15)  // CS42L42, active low
@@ -211,11 +214,6 @@ static const uint8_t default_low_pins[] = {
     PIN_CS42_RESET,
     PIN_BT_RESET,
 
-    // eMMC held in reset with its VCCQ rail off. The contents of the chip are
-    // unaffected; this only keeps the rail from floating.
-    PIN_EMMC_RESET,
-    PIN_EMMC_VCCQ_EN,
-
     // Rail feeding the faders and both button ladders. Off unless something is
     // actually reading them.
     PIN_CONTROL_RAIL,
@@ -246,6 +244,18 @@ static bool apply_pin_default(uint8_t pin_number) {
         }
     }
 
+    // eMMC held in reset with its VCCQ rail off. The contents of the chip are
+    // unaffected; this only keeps the rail from floating. The exception is a
+    // card the supervisor has automounted: it is a live filesystem between
+    // runs, so leave its reset and rail exactly as the driver left them.
+    if (pin_number == PIN_EMMC_RESET || pin_number == PIN_EMMC_VCCQ_EN) {
+        if (!emmcio_is_automounted()) {
+            nrf_gpio_cfg_output(pin_number);
+            nrf_gpio_pin_clear(pin_number);
+        }
+        return true;
+    }
+
     for (size_t i = 0; i < MP_ARRAY_SIZE(default_low_pins); i++) {
         if (default_low_pins[i] == pin_number) {
             nrf_gpio_cfg_output(pin_number);
@@ -260,6 +270,8 @@ static bool apply_pin_default(uint8_t pin_number) {
 // Put every pin this board has an opinion about into its resting state at once.
 static void apply_all_pin_defaults(void) {
     apply_pin_default(PIN_FUNCTION_BUTTON);
+    apply_pin_default(PIN_EMMC_RESET);
+    apply_pin_default(PIN_EMMC_VCCQ_EN);
     for (size_t i = 0; i < MP_ARRAY_SIZE(led_pins); i++) {
         apply_pin_default(led_pins[i]);
     }

ports/nordic/boards/teenage_engineering_sp1/mpconfigboard.h

@@ -59,6 +59,13 @@
 // No SD card LUN. There is no card slot on this device.
 #define CIRCUITPY_SDCARD_USB        (0)
 
+// The 4 GB eMMC
+#define DEFAULT_EMMC_CLOCK          (&pin_P0_06)
+#define DEFAULT_EMMC_COMMAND        (&pin_P0_08)
+#define DEFAULT_EMMC_DATA           (&pin_P0_07)
+#define DEFAULT_EMMC_RESET          (&pin_P1_08)
+#define DEFAULT_EMMC_VCCQ           (&pin_P0_14)
+
 // TWIM to the CS42L42 (0x48) and TAS2505 (0x18).
 #define DEFAULT_I2C_BUS_SCL         (&pin_P1_11)
 #define DEFAULT_I2C_BUS_SDA         (&pin_P1_07)

ports/nordic/boards/teenage_engineering_sp1/mpconfigboard.mk

@@ -50,4 +50,13 @@ SRC_C += boards/$(BOARD)/power_off.c
 # bootloader does not set up for itself.
 SRC_C += boards/$(BOARD)/flash_protect.c
 
+# The soldered-down eMMC, and the supervisor mount that puts it on /sd and on
+# USB as a second drive.
+CIRCUITPY_EMMCIO = 1
+CIRCUITPY_EMMC_USB = 1
+
+FROZEN_MPY_DIRS += $(TOP)/frozen/Adafruit_CircuitPython_Register
+FROZEN_MPY_DIRS += $(TOP)/frozen/Adafruit_CircuitPython_CS42L42
+FROZEN_MPY_DIRS += $(TOP)/frozen/Adafruit_CircuitPython_TAS2505
+
 CIRCUITPY_REQUIRE_I2C_PULLUPS = 0

ports/nordic/common-hal/emmcio/EMMC.c

@@ -510,14 +510,6 @@ bool common_hal_emmcio_emmc_read_ext_csd(uint8_t *buf) {
 
 #define EMMC_BUSY_LEADIN_CLOCKS 16
 
-// run_bg says whether a long stall may run background tasks.
-//   true  -- the wait is between transfers, so it is safe to let the rest of
-//            the system have a turn.
-//   false -- the wait is inside a write, with the card mid-program. Nothing
-//            runs, so no background task can re-enter this driver or change
-//            the board's state out from under a programming card. The stall
-//            is bounded (<=500 ms) and background tasks resume between
-//            blocks and between calls.
 static bool dat0_busy_wait(uint32_t timeout_us, bool run_bg) {
     DAT0_IN();                                   // never drive against a busy card
     for (int i = 0; i < EMMC_BUSY_LEADIN_CLOCKS; i++) {