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

source/bootloader/u-boot-2020.01/drivers/power/power_spi.c

@@ -0,0 +1,72 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2011 Samsung Electronics
+ * Lukasz Majewski <l.majewski@samsung.com>
+ *
+ * (C) Copyright 2010
+ * Stefano Babic, DENX Software Engineering, sbabic@denx.de
+ *
+ * (C) Copyright 2008-2009 Freescale Semiconductor, Inc.
+ */
+
+#include <common.h>
+#include <linux/types.h>
+#include <power/pmic.h>
+#include <spi.h>
+
+static struct spi_slave *slave;
+
+static u32 pmic_reg(struct pmic *p, u32 reg, u32 *val, u32 write)
+{
+	u32 pmic_tx, pmic_rx;
+	u32 tmp;
+
+	if (!slave) {
+		slave = spi_setup_slave(p->bus, p->hw.spi.cs, p->hw.spi.clk,
+					p->hw.spi.mode);
+
+		if (!slave)
+			return -ENODEV;
+	}
+
+	if (check_reg(p, reg))
+		return -EINVAL;
+
+	if (spi_claim_bus(slave))
+		return -EBUSY;
+
+	pmic_tx = p->hw.spi.prepare_tx(reg, val, write);
+
+	tmp = cpu_to_be32(pmic_tx);
+
+	if (spi_xfer(slave, pmic_spi_bitlen, &tmp, &pmic_rx,
+			pmic_spi_flags))
+		goto err;
+
+	if (write) {
+		pmic_tx = p->hw.spi.prepare_tx(reg, val, 0);
+		tmp = cpu_to_be32(pmic_tx);
+		if (spi_xfer(slave, pmic_spi_bitlen, &tmp, &pmic_rx,
+			pmic_spi_flags))
+			goto err;
+	}
+
+	spi_release_bus(slave);
+	*val = cpu_to_be32(pmic_rx);
+
+	return 0;
+
+err:
+	spi_release_bus(slave);
+	return -ENOTSUPP;
+}
+
+int pmic_reg_write(struct pmic *p, u32 reg, u32 val)
+{
+	return pmic_reg(p, reg, &val, 1);
+}
+
+int pmic_reg_read(struct pmic *p, u32 reg, u32 *val)
+{
+	return pmic_reg(p, reg, val, 0);
+}