Eric Lee / smarc-uboot

Blame view

drivers/misc/microchip_flexcom.c 1.48 KB
edit raw normal view history
f81649586   Eugen Hristev   misc: microchip_f... 
1
2
3
4
5
6
7
8
9
10
11
 
  // 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>
61b29b826   Simon Glass   dm: core: Require... 
12
 
  #include <linux/err.h>
f81649586   Eugen Hristev   misc: microchip_f... 
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
 
  
  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
  ");
  		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
  ");
  		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),
  };