1
2
3
4
5
6
7
8
9
10
11
12
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
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
|
// SPDX-License-Identifier: GPL-2.0
/*
* Linux driver for RPC-IF HyperFlash
*
* Copyright (C) 2019-2020 Cogent Embedded, Inc.
*/
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mtd/hyperbus.h>
#include <linux/mtd/mtd.h>
#include <linux/mux/consumer.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/types.h>
#include <memory/renesas-rpc-if.h>
struct rpcif_hyperbus {
struct rpcif rpc;
struct hyperbus_ctlr ctlr;
struct hyperbus_device hbdev;
};
static const struct rpcif_op rpcif_op_tmpl = {
.cmd = {
.buswidth = 8,
.ddr = true,
},
.ocmd = {
.buswidth = 8,
.ddr = true,
},
.addr = {
.nbytes = 1,
.buswidth = 8,
.ddr = true,
},
.data = {
.buswidth = 8,
.ddr = true,
},
};
static void rpcif_hb_prepare_read(struct rpcif *rpc, void *to,
unsigned long from, ssize_t len)
{
struct rpcif_op op = rpcif_op_tmpl;
op.cmd.opcode = HYPERBUS_RW_READ | HYPERBUS_AS_MEM;
op.addr.val = from >> 1;
op.dummy.buswidth = 1;
op.dummy.ncycles = 15;
op.data.dir = RPCIF_DATA_IN;
op.data.nbytes = len;
op.data.buf.in = to;
rpcif_prepare(rpc, &op, NULL, NULL);
}
static void rpcif_hb_prepare_write(struct rpcif *rpc, unsigned long to,
void *from, ssize_t len)
{
struct rpcif_op op = rpcif_op_tmpl;
op.cmd.opcode = HYPERBUS_RW_WRITE | HYPERBUS_AS_MEM;
op.addr.val = to >> 1;
op.data.dir = RPCIF_DATA_OUT;
op.data.nbytes = len;
op.data.buf.out = from;
rpcif_prepare(rpc, &op, NULL, NULL);
}
static u16 rpcif_hb_read16(struct hyperbus_device *hbdev, unsigned long addr)
{
struct rpcif_hyperbus *hyperbus =
container_of(hbdev, struct rpcif_hyperbus, hbdev);
map_word data;
rpcif_hb_prepare_read(&hyperbus->rpc, &data, addr, 2);
rpcif_manual_xfer(&hyperbus->rpc);
return data.x[0];
}
static void rpcif_hb_write16(struct hyperbus_device *hbdev, unsigned long addr,
u16 data)
{
struct rpcif_hyperbus *hyperbus =
container_of(hbdev, struct rpcif_hyperbus, hbdev);
rpcif_hb_prepare_write(&hyperbus->rpc, addr, &data, 2);
rpcif_manual_xfer(&hyperbus->rpc);
}
static void rpcif_hb_copy_from(struct hyperbus_device *hbdev, void *to,
unsigned long from, ssize_t len)
{
struct rpcif_hyperbus *hyperbus =
container_of(hbdev, struct rpcif_hyperbus, hbdev);
rpcif_hb_prepare_read(&hyperbus->rpc, to, from, len);
rpcif_dirmap_read(&hyperbus->rpc, from, len, to);
}
static const struct hyperbus_ops rpcif_hb_ops = {
.read16 = rpcif_hb_read16,
.write16 = rpcif_hb_write16,
.copy_from = rpcif_hb_copy_from,
};
static int rpcif_hb_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct rpcif_hyperbus *hyperbus;
int error;
hyperbus = devm_kzalloc(dev, sizeof(*hyperbus), GFP_KERNEL);
if (!hyperbus)
return -ENOMEM;
error = rpcif_sw_init(&hyperbus->rpc, pdev->dev.parent);
if (error)
return error;
platform_set_drvdata(pdev, hyperbus);
rpcif_enable_rpm(&hyperbus->rpc);
error = rpcif_hw_init(&hyperbus->rpc, true);
if (error)
return error;
hyperbus->hbdev.map.size = hyperbus->rpc.size;
hyperbus->hbdev.map.virt = hyperbus->rpc.dirmap;
hyperbus->ctlr.dev = dev;
hyperbus->ctlr.ops = &rpcif_hb_ops;
hyperbus->hbdev.ctlr = &hyperbus->ctlr;
hyperbus->hbdev.np = of_get_next_child(pdev->dev.parent->of_node, NULL);
error = hyperbus_register_device(&hyperbus->hbdev);
if (error)
rpcif_disable_rpm(&hyperbus->rpc);
return error;
}
static int rpcif_hb_remove(struct platform_device *pdev)
{
struct rpcif_hyperbus *hyperbus = platform_get_drvdata(pdev);
int error = hyperbus_unregister_device(&hyperbus->hbdev);
rpcif_disable_rpm(&hyperbus->rpc);
return error;
}
static struct platform_driver rpcif_platform_driver = {
.probe = rpcif_hb_probe,
.remove = rpcif_hb_remove,
.driver = {
.name = "rpc-if-hyperflash",
},
};
module_platform_driver(rpcif_platform_driver);
MODULE_DESCRIPTION("Renesas RPC-IF HyperFlash driver");
MODULE_LICENSE("GPL v2");
|
