mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-06 05:04:26 +00:00
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>
64 lines
1.5 KiB
C
64 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* (C) Copyright 2019, Microchip Technology, Inc.
|
|
* Author: Eugen Hristev <eugen.hristev@microchip.com>
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <dm.h>
|
|
#include <errno.h>
|
|
#include <misc.h>
|
|
#include <asm/io.h>
|
|
|
|
struct microchip_flexcom_regs {
|
|
u32 cr;
|
|
};
|
|
|
|
struct microchip_flexcom_platdata {
|
|
struct microchip_flexcom_regs *regs;
|
|
u32 flexcom_mode;
|
|
};
|
|
|
|
static int microchip_flexcom_ofdata_to_platdata(struct udevice *dev)
|
|
{
|
|
struct microchip_flexcom_platdata *plat = dev_get_platdata(dev);
|
|
int ret;
|
|
|
|
plat->regs = map_physmem(devfdt_get_addr(dev),
|
|
sizeof(struct microchip_flexcom_regs),
|
|
MAP_NOCACHE);
|
|
|
|
ret = dev_read_u32(dev, "atmel,flexcom-mode", &plat->flexcom_mode);
|
|
|
|
if (IS_ERR_VALUE(ret)) {
|
|
debug("Missing atmel,flexcom-mode property\n");
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* The mode must have only 2 bits. If any other bits are set,
|
|
* the value is not supported.
|
|
*/
|
|
if (plat->flexcom_mode & 0xfffffffc) {
|
|
debug("Wrong atmel,flexcom-mode property\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
writel(plat->flexcom_mode, &plat->regs->cr);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct udevice_id microchip_flexcom_ids[] = {
|
|
{ .compatible = "atmel,sama5d2-flexcom" },
|
|
{ .compatible = "microchip,flexcom" },
|
|
{}
|
|
};
|
|
|
|
U_BOOT_DRIVER(microchip_flexcom) = {
|
|
.name = "microchip_flexcom",
|
|
.id = UCLASS_MISC,
|
|
.of_match = microchip_flexcom_ids,
|
|
.ofdata_to_platdata = microchip_flexcom_ofdata_to_platdata,
|
|
.platdata_auto_alloc_size = sizeof(struct microchip_flexcom_platdata),
|
|
};
|