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https://github.com/brain-hackers/u-boot-brain
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f81649586d
The Microchip Flexcom is just a wrapper which embeds a SPI controller, an I2C controller and an USART. Only one function can be used at a time and is chosen at boot time according to the device tree. The bindings are kept as in Linux. The driver registers to MISC_UCLASS. Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
65 lines
1.5 KiB
C
65 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2019, Microchip Technology, Inc.
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* Author: Eugen Hristev <eugen.hristev@microchip.com>
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*/
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#include <common.h>
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#include <dm.h>
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#include <errno.h>
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#include <misc.h>
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#include <asm/io.h>
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struct microchip_flexcom_regs {
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u32 cr;
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};
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struct microchip_flexcom_platdata {
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struct microchip_flexcom_regs *regs;
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u32 flexcom_mode;
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};
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static int microchip_flexcom_ofdata_to_platdata(struct udevice *dev)
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{
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struct microchip_flexcom_platdata *plat = dev_get_platdata(dev);
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int ret;
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plat->regs = map_physmem(devfdt_get_addr(dev),
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sizeof(struct microchip_flexcom_regs),
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MAP_NOCACHE);
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ret = dev_read_u32(dev, "atmel,flexcom-mode", &plat->flexcom_mode);
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if (IS_ERR_VALUE(ret)) {
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debug("Missing atmel,flexcom-mode property\n");
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return ret;
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}
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/*
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* The mode must have only 2 bits. If any other bits are set,
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* the value is not supported.
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*/
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if (plat->flexcom_mode & 0xfffffffc) {
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debug("Wrong atmel,flexcom-mode property\n");
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return -EINVAL;
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}
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writel(plat->flexcom_mode, &plat->regs->cr);
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return 0;
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}
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static const struct udevice_id microchip_flexcom_ids[] = {
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{ .compatible = "atmel,sama5d2-flexcom" },
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{ .compatible = "microchip,flexcom" },
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{}
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};
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U_BOOT_DRIVER(microchip_flexcom) = {
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.name = "microchip_flexcom",
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.id = UCLASS_MISC,
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.of_match = microchip_flexcom_ids,
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.ofdata_to_platdata = microchip_flexcom_ofdata_to_platdata,
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.platdata_auto_alloc_size = sizeof(struct microchip_flexcom_platdata),
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};
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