xref: /openbmc/u-boot/drivers/axi/sandbox_store.c (revision b71d9e8b)
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * (C) Copyright 2018
4  * Mario Six, Guntermann & Drunck GmbH, mario.six@gdsys.cc
5  */
6 
7 #include <common.h>
8 #include <axi.h>
9 #include <dm.h>
10 
11 /**
12  * struct sandbox_store_priv - Private data structure of a AXI store device
13  * @store: The buffer holding the device's internal memory, which is read from
14  *	   and written to using the driver's methods
15  */
16 struct sandbox_store_priv {
17 	u8 *store;
18 };
19 
20 /**
21  * copy_axi_data() - Copy data from source to destination with a given AXI
22  *		     transfer width
23  * @src:  Pointer to the data source from where data will be read
24  * @dst:  Pointer to the data destination where data will be written to
25  * @size: Size of the data to be copied given by a axi_size_t enum value
26  *
27  * Return: 0 if OK, -ve on error
28  */
copy_axi_data(void * src,void * dst,enum axi_size_t size)29 static int copy_axi_data(void *src, void *dst, enum axi_size_t size)
30 {
31 	switch (size) {
32 	case AXI_SIZE_8:
33 		*((u8 *)dst) = *((u8 *)src);
34 		return 0;
35 	case AXI_SIZE_16:
36 		*((u16 *)dst) = be16_to_cpu(*((u16 *)src));
37 		return 0;
38 	case AXI_SIZE_32:
39 		*((u32 *)dst) = be32_to_cpu(*((u32 *)src));
40 		return 0;
41 	default:
42 		debug("%s: Unknown AXI transfer size '%d'\n", __func__, size);
43 		return -EINVAL;
44 	}
45 }
46 
sandbox_store_read(struct udevice * dev,ulong address,void * data,enum axi_size_t size)47 static int sandbox_store_read(struct udevice *dev, ulong address, void *data,
48 			      enum axi_size_t size)
49 {
50 	struct sandbox_store_priv *priv = dev_get_priv(dev);
51 
52 	return copy_axi_data(priv->store + address, data, size);
53 }
54 
sandbox_store_write(struct udevice * dev,ulong address,void * data,enum axi_size_t size)55 static int sandbox_store_write(struct udevice *dev, ulong address, void *data,
56 			       enum axi_size_t size)
57 {
58 	struct sandbox_store_priv *priv = dev_get_priv(dev);
59 
60 	return copy_axi_data(data, priv->store + address, size);
61 }
62 
sandbox_store_get_store(struct udevice * dev,u8 ** store)63 static int sandbox_store_get_store(struct udevice *dev, u8 **store)
64 {
65 	struct sandbox_store_priv *priv = dev_get_priv(dev);
66 
67 	*store = priv->store;
68 
69 	return 0;
70 }
71 
72 static const struct udevice_id sandbox_store_ids[] = {
73 	{ .compatible = "sandbox,sandbox_store" },
74 	{ /* sentinel */ }
75 };
76 
77 static const struct axi_emul_ops sandbox_store_ops = {
78 	.read = sandbox_store_read,
79 	.write = sandbox_store_write,
80 	.get_store = sandbox_store_get_store,
81 };
82 
sandbox_store_probe(struct udevice * dev)83 static int sandbox_store_probe(struct udevice *dev)
84 {
85 	struct sandbox_store_priv *priv = dev_get_priv(dev);
86 	u32 reg[2];
87 	int ret;
88 
89 	ret = dev_read_u32_array(dev, "reg", reg, ARRAY_SIZE(reg));
90 	if (ret) {
91 		debug("%s: Could not read 'reg' property\n", dev->name);
92 		return -EINVAL;
93 	}
94 
95 	/*
96 	 * Allocate the device's internal storage that will be read
97 	 * from/written to
98 	 */
99 	priv->store = calloc(reg[1], 1);
100 	if (!priv->store)
101 		return -ENOMEM;
102 
103 	return 0;
104 }
105 
sandbox_store_remove(struct udevice * dev)106 static int sandbox_store_remove(struct udevice *dev)
107 {
108 	struct sandbox_store_priv *priv = dev_get_priv(dev);
109 
110 	free(priv->store);
111 
112 	return 0;
113 }
114 
115 U_BOOT_DRIVER(sandbox_axi_store) = {
116 	.name           = "sandbox_axi_store",
117 	.id             = UCLASS_AXI_EMUL,
118 	.of_match       = sandbox_store_ids,
119 	.ops		= &sandbox_store_ops,
120 	.priv_auto_alloc_size = sizeof(struct sandbox_store_priv),
121 	.probe          = sandbox_store_probe,
122 	.remove		= sandbox_store_remove,
123 };
124