HAL for Linux (#13146)

Marlin/src/HAL/HAL_LINUX/spi_pins.h

@@ -0,0 +1,53 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (C) 2019 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * 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/>.
+ *
+ */
+#pragma once
+
+#include "src/core/macros.h"
+
+#if ENABLED(SDSUPPORT) && ENABLED(DOGLCD) && (LCD_PINS_D4 == SCK_PIN || LCD_PINS_ENABLE == MOSI_PIN || DOGLCD_SCK == SCK_PIN || DOGLCD_MOSI == MOSI_PIN)
+  #define LPC_SOFTWARE_SPI  // If the SD card and LCD adapter share the same SPI pins, then software SPI is currently
+                            // needed due to the speed and mode requred for communicating with each device being different.
+                            // This requirement can be removed if the SPI access to these devices is updated to use
+                            // spiBeginTransaction.
+#endif
+
+/** onboard SD card */
+//#define SCK_PIN           P0_07
+//#define MISO_PIN          P0_08
+//#define MOSI_PIN          P0_09
+//#define SS_PIN            P0_06
+/** external */
+#ifndef SCK_PIN
+  #define SCK_PIN           50
+#endif
+#ifndef MISO_PIN
+  #define MISO_PIN          51
+#endif
+#ifndef MOSI_PIN
+  #define MOSI_PIN          52
+#endif
+#ifndef SS_PIN
+  #define SS_PIN            53
+#endif
+#ifndef SDSS
+  #define SDSS              SS_PIN
+#endif