gr712: add dummy 'storage in ram' driver

JIRA: RTOS-616

devices/flash-dummy/Makefile

@@ -0,0 +1,9 @@
+#
+# Makefile for flash-dummy
+#
+# Copyright 2023 Phoenix Systems
+#
+# %LICENSE%
+#
+
+OBJS += $(addprefix $(PREFIX_O)devices/flash-dummy/, flashdrv.o)

devices/flash-dummy/flashdrv.c

@@ -0,0 +1,110 @@
+/*
+ * Phoenix-RTOS
+ *
+ * plo - operating system loader
+ *
+ * Dummy flash driver
+ *
+ * Copyright 2023 Phoenix Systems
+ * Author: Lukasz Leczkowski
+ *
+ * This file is part of Phoenix-RTOS.
+ *
+ * %LICENSE%
+ */
+
+#include <hal/hal.h>
+#include <lib/errno.h>
+#include <devices/devs.h>
+
+
+static int flashdrv_isValidMinor(unsigned int minor)
+{
+	return (minor < FLASH_NO) ? 1 : 0;
+}
+
+
+/* Device interface */
+static ssize_t flashdrv_read(unsigned int minor, addr_t offs, void *buff, size_t len, time_t timeout)
+{
+	char *memptr;
+	ssize_t ret = -EINVAL;
+
+	(void)timeout;
+
+	if (flashdrv_isValidMinor(minor) != 0) {
+		memptr = FLASH_START;
+
+		hal_memcpy(buff, memptr + offs, len);
+		ret = (ssize_t)len;
+	}
+
+	return ret;
+}
+
+
+static ssize_t flashdrv_write(unsigned int minor, addr_t offs, const void *buff, size_t len)
+{
+	return -ENOSYS;
+}
+
+
+static int flashdrv_done(unsigned int minor)
+{
+	if (flashdrv_isValidMinor(minor) == 0) {
+		return -EINVAL;
+	}
+
+	/* Nothing to do */
+
+	return EOK;
+}
+
+
+static int flashdrv_sync(unsigned int minor)
+{
+	if (flashdrv_isValidMinor(minor) == 0) {
+		return -EINVAL;
+	}
+
+	/* Nothing to do */
+
+	return EOK;
+}
+
+
+static int flashdrv_map(unsigned int minor, addr_t addr, size_t sz, int mode, addr_t memaddr, size_t memsz, int memmode, addr_t *a)
+{
+	if (flashdrv_isValidMinor(minor) == 0) {
+		return -EINVAL;
+	}
+
+	/* Data can be copied from device to map */
+	return dev_isNotMappable;
+}
+
+
+static int flashdrv_init(unsigned int minor)
+{
+	if (flashdrv_isValidMinor(minor) == 0) {
+		return -EINVAL;
+	}
+
+	return EOK;
+}
+
+
+__attribute__((constructor)) static void flashdrv_reg(void)
+{
+	static const dev_handler_t h = {
+		.init = flashdrv_init,
+		.done = flashdrv_done,
+		.read = flashdrv_read,
+		.write = flashdrv_write,
+		.erase = NULL,
+		.sync = flashdrv_sync,
+		.map = flashdrv_map
+	};
+
+	devs_register(DEV_STORAGE, FLASH_NO, &h);
+}

hal/sparcv8leon3/gaisler/gr712rc/Makefile

@@ -11,5 +11,6 @@ CFLAGS += -DVADDR_KERNEL_INIT=$(VADDR_KERNEL_INIT)
 PLO_COMMANDS := alias app call console copy dump echo go help kernel map mem phfs reboot script wait
 
 include devices/uart-grlib/Makefile
+include devices/flash-dummy/Makefile
 
 OBJS += $(addprefix $(PREFIX_O)hal/$(TARGET_SUFF)/gaisler/$(TARGET_SUBFAMILY)/, _init.o hal.o gr712rc.o)

hal/sparcv8leon3/gaisler/gr712rc/peripherals.h

@@ -40,5 +40,7 @@
 #define GPT_TRLDVAL4 17 /* Timer 4 reload value reg     : 0x44 */
 #define GPT_TCTRL4   18 /* Timer 4 control register     : 0x48 */
 
+#define FLASH_NO    1
+#define FLASH_START ((void *)0x47e00000)
 
 #endif