From f1136324747468c7473445a65a41b0c799929fc9 Mon Sep 17 00:00:00 2001
From: Nedko Arnaudov <nedko@arnaudov.name>
Date: Sun, 1 Jul 2018 16:58:22 +0300
Subject: [PATCH] esp-idf-bootloader: hw_esp32.c initial revision

---
 src/hw_esp32.c | 135 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 135 insertions(+)
 create mode 100644 src/hw_esp32.c

diff --git a/src/hw_esp32.c b/src/hw_esp32.c
new file mode 100644
index 0000000..5020bd5
--- /dev/null
+++ b/src/hw_esp32.c
@@ -0,0 +1,135 @@
+/* -*- Mode: C ; c-basic-offset: 2 -*- */
+/*
+ * Copyright 2018 apeos contributors
+ *
+ * apeos Espressif esp-32 hardware interface functions
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <apeos/apeos.h>
+#include <apeos/hw.h>
+#include <rom/ets_sys.h>         /* ets_printf */
+#include <rom/spi_flash.h>       /* g_rom_flashchip */
+#include <soc/rtc_cntl_reg.h>    /* RTC_CNTL_WDTCONFIG0_REG */
+#include <soc/timer_group_reg.h> /* TIMG_WDTCONFIG0_REG */
+#include <soc/cpu.h>             /* esp_cpu_stall() */
+#include <soc/efuse_reg.h>       /* EFUSE_BLK0_RDATA3_REG */
+
+static void esp32_disable_watchdog(void)
+{
+  REG_CLR_BIT(RTC_CNTL_WDTCONFIG0_REG, RTC_CNTL_WDT_FLASHBOOT_MOD_EN);
+  REG_CLR_BIT(TIMG_WDTCONFIG0_REG(0), TIMG_WDT_FLASHBOOT_MOD_EN);
+}
+
+void hw_init(void)
+{
+  ets_printf("apeos booting\n");
+  esp32_disable_watchdog();
+}
+
+void hw_uninit(void)
+{
+  esp_cpu_stall(0);
+}
+
+static
+bool
+esp32_package_get_info(
+  uint32_t efuse_blk0_rdata3_reg,
+  bool * embedded_flash_ptr,
+  const char ** package_description_ptr_ptr)
+{
+  const char * package_description_ptr;
+  bool embedded_flash;
+
+  switch ((efuse_blk0_rdata3_reg & EFUSE_RD_CHIP_VER_PKG_M)
+          >> EFUSE_RD_CHIP_VER_PKG_S)
+  {
+  case EFUSE_RD_CHIP_VER_PKG_ESP32D2WDQ5:
+    package_description_ptr = "D2WDQ5";
+    embedded_flash = true;
+    break;
+  case EFUSE_RD_CHIP_VER_PKG_ESP32PICOD2:
+    package_description_ptr = "PICOD2";
+    embedded_flash = true;
+    break;
+  case EFUSE_RD_CHIP_VER_PKG_ESP32PICOD4:
+    package_description_ptr = "PICOD4";
+    embedded_flash = true;
+    break;
+  default:
+    package_description_ptr = NULL;
+  }
+
+  if (package_description_ptr == NULL)  /* unknown chip package */
+  {
+    *package_description_ptr_ptr = "unknown";
+    return false;
+  }
+
+  *package_description_ptr_ptr = package_description_ptr;
+  *embedded_flash_ptr = embedded_flash;
+  return true;
+}
+
+/* Print chip information */
+void hw_info(void)
+{
+  uint32_t reg;
+  bool known_package;
+  bool embedded_flash;
+  const char * package_description_ptr;
+  bool bluetooth;
+  uint32_t spiflash_chip_size;
+
+  reg = REG_READ(EFUSE_BLK0_RDATA3_REG);
+
+  known_package = esp32_package_get_info(
+    reg,
+    &embedded_flash,
+    &package_description_ptr);
+
+  /* bluetooth is enabled if not found disabled in efuse */
+  bluetooth = (reg & EFUSE_RD_CHIP_VER_DIS_BT_M) == 0;
+
+  /* size of SPI flash chip, in bytes */
+  spiflash_chip_size = g_rom_flashchip.chip_size;
+
+  ets_printf(
+    "ESP32 SoC");
+
+  if (known_package)
+  {
+    ets_printf(
+      ", %s package",
+      package_description_ptr);
+  }
+
+  ets_printf(
+    ", silicon revision %d", ((reg & EFUSE_RD_CHIP_VER_REV1_M) != 0) ? 1 : 0);
+
+  ets_printf(
+    ", %d CPU cores",
+    ((reg & EFUSE_RD_CHIP_VER_DIS_APP_CPU_M) == 0) ? 2 : 1);
+
+  ets_printf(
+    ", bluetooth %s",
+    bluetooth ? "enabled" : "disabled");
+
+  ets_printf(
+    ", %u byte %sflash\n",
+    (unsigned int)spiflash_chip_size,
+    known_package ? (embedded_flash ? "embedded " : "external ") : "");
+}
-- 
2.11.4.GIT