GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

2026-09-06 03:52:57 +08:00
commit b1928b41c0
21813 changed files with 4413081 additions and 0 deletions
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+/*
+ * Simulate a SPI port
+ *
+ * Copyright (c) 2011-2013 The Chromium OS Authors.
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#define LOG_CATEGORY UCLASS_SPI
+
+#include <common.h>
+#include <dm.h>
+#include <malloc.h>
+#include <spi.h>
+#include <spi_flash.h>
+#include <os.h>
+
+#include <linux/errno.h>
+#include <asm/spi.h>
+#include <asm/state.h>
+#include <dm/device-internal.h>
+
+#ifndef CONFIG_SPI_IDLE_VAL
+# define CONFIG_SPI_IDLE_VAL 0xFF
+#endif
+
+const char *sandbox_spi_parse_spec(const char *arg, unsigned long *bus,
+				   unsigned long *cs)
+{
+	char *endp;
+
+	*bus = simple_strtoul(arg, &endp, 0);
+	if (*endp != ':' || *bus >= CONFIG_SANDBOX_SPI_MAX_BUS)
+		return NULL;
+
+	*cs = simple_strtoul(endp + 1, &endp, 0);
+	if (*endp != ':' || *cs >= CONFIG_SANDBOX_SPI_MAX_CS)
+		return NULL;
+
+	return endp + 1;
+}
+
+__weak int sandbox_spi_get_emul(struct sandbox_state *state,
+				struct udevice *bus, struct udevice *slave,
+				struct udevice **emulp)
+{
+	return -ENOENT;
+}
+
+static int sandbox_spi_xfer(struct udevice *slave, unsigned int bitlen,
+			    const void *dout, void *din, unsigned long flags)
+{
+	struct udevice *bus = slave->parent;
+	struct sandbox_state *state = state_get_current();
+	struct dm_spi_emul_ops *ops;
+	struct udevice *emul;
+	uint bytes = bitlen / 8, i;
+	int ret;
+	uint busnum, cs;
+
+	if (bitlen == 0)
+		return 0;
+
+	/* we can only do 8 bit transfers */
+	if (bitlen % 8) {
+		printf("sandbox_spi: xfer: invalid bitlen size %u; needs to be 8bit\n",
+		       bitlen);
+		return -EINVAL;
+	}
+
+	busnum = bus->seq;
+	cs = spi_chip_select(slave);
+	if (busnum >= CONFIG_SANDBOX_SPI_MAX_BUS ||
+	    cs >= CONFIG_SANDBOX_SPI_MAX_CS) {
+		printf("%s: busnum=%u, cs=%u: out of range\n", __func__,
+		       busnum, cs);
+		return -ENOENT;
+	}
+	ret = sandbox_spi_get_emul(state, bus, slave, &emul);
+	if (ret) {
+		printf("%s: busnum=%u, cs=%u: no emulation available (err=%d)\n",
+		       __func__, busnum, cs, ret);
+		return -ENOENT;
+	}
+	ret = device_probe(emul);
+	if (ret)
+		return ret;
+
+	ops = spi_emul_get_ops(emul);
+	ret = ops->xfer(emul, bitlen, dout, din, flags);
+
+	log_content("sandbox_spi: xfer: got back %i (that's %s)\n rx:",
+		    ret, ret ? "bad" : "good");
+	if (din) {
+		for (i = 0; i < bytes; ++i)
+			log_content(" %u:%02x", i, ((u8 *)din)[i]);
+	}
+	log_content("\n");
+
+	return ret;
+}
+
+static int sandbox_spi_set_speed(struct udevice *bus, uint speed)
+{
+	return 0;
+}
+
+static int sandbox_spi_set_mode(struct udevice *bus, uint mode)
+{
+	return 0;
+}
+
+static int sandbox_cs_info(struct udevice *bus, uint cs,
+			   struct spi_cs_info *info)
+{
+	/* Always allow activity on CS 0 */
+	if (cs >= 1)
+		return -EINVAL;
+
+	return 0;
+}
+
+static int sandbox_spi_get_mmap(struct udevice *dev, ulong *map_basep,
+				uint *map_sizep, uint *offsetp)
+{
+	*map_basep = 0x1000;
+	*map_sizep = 0x2000;
+	*offsetp = 0x100;
+
+	return 0;
+}
+
+static const struct dm_spi_ops sandbox_spi_ops = {
+	.xfer		= sandbox_spi_xfer,
+	.set_speed	= sandbox_spi_set_speed,
+	.set_mode	= sandbox_spi_set_mode,
+	.cs_info	= sandbox_cs_info,
+	.get_mmap	= sandbox_spi_get_mmap,
+};
+
+static const struct udevice_id sandbox_spi_ids[] = {
+	{ .compatible = "sandbox,spi" },
+	{ }
+};
+
+U_BOOT_DRIVER(spi_sandbox) = {
+	.name	= "spi_sandbox",
+	.id	= UCLASS_SPI,
+	.of_match = sandbox_spi_ids,
+	.ops	= &sandbox_spi_ops,
+};