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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Linux driver for RPC-IF HyperFlash
4 *
5 * Copyright (C) 2019-2020 Cogent Embedded, Inc.
6 */
7
8#include <linux/err.h>
9#include <linux/kernel.h>
10#include <linux/module.h>
11#include <linux/mtd/hyperbus.h>
12#include <linux/mtd/mtd.h>
13#include <linux/mux/consumer.h>
14#include <linux/of.h>
15#include <linux/platform_device.h>
16#include <linux/types.h>
17
18#include <memory/renesas-rpc-if.h>
19
20struct rpcif_hyperbus {
21 struct rpcif rpc;
22 struct hyperbus_ctlr ctlr;
23 struct hyperbus_device hbdev;
24};
25
26static const struct rpcif_op rpcif_op_tmpl = {
27 .cmd = {
28 .buswidth = 8,
29 .ddr = true,
30 },
31 .ocmd = {
32 .buswidth = 8,
33 .ddr = true,
34 },
35 .addr = {
36 .nbytes = 1,
37 .buswidth = 8,
38 .ddr = true,
39 },
40 .data = {
41 .buswidth = 8,
42 .ddr = true,
43 },
44};
45
46static void rpcif_hb_prepare_read(struct rpcif *rpc, void *to,
47 unsigned long from, ssize_t len)
48{
49 struct rpcif_op op = rpcif_op_tmpl;
50
51 op.cmd.opcode = HYPERBUS_RW_READ | HYPERBUS_AS_MEM;
52 op.addr.val = from >> 1;
53 op.dummy.buswidth = 1;
54 op.dummy.ncycles = 15;
55 op.data.dir = RPCIF_DATA_IN;
56 op.data.nbytes = len;
57 op.data.buf.in = to;
58
59 rpcif_prepare(rpc->dev, &op, NULL, NULL);
60}
61
62static void rpcif_hb_prepare_write(struct rpcif *rpc, unsigned long to,
63 void *from, ssize_t len)
64{
65 struct rpcif_op op = rpcif_op_tmpl;
66
67 op.cmd.opcode = HYPERBUS_RW_WRITE | HYPERBUS_AS_MEM;
68 op.addr.val = to >> 1;
69 op.data.dir = RPCIF_DATA_OUT;
70 op.data.nbytes = len;
71 op.data.buf.out = from;
72
73 rpcif_prepare(rpc->dev, &op, NULL, NULL);
74}
75
76static u16 rpcif_hb_read16(struct hyperbus_device *hbdev, unsigned long addr)
77{
78 struct rpcif_hyperbus *hyperbus =
79 container_of(hbdev, struct rpcif_hyperbus, hbdev);
80 map_word data;
81
82 rpcif_hb_prepare_read(&hyperbus->rpc, &data, addr, 2);
83
84 rpcif_manual_xfer(hyperbus->rpc.dev);
85
86 return data.x[0];
87}
88
89static void rpcif_hb_write16(struct hyperbus_device *hbdev, unsigned long addr,
90 u16 data)
91{
92 struct rpcif_hyperbus *hyperbus =
93 container_of(hbdev, struct rpcif_hyperbus, hbdev);
94
95 rpcif_hb_prepare_write(&hyperbus->rpc, addr, &data, 2);
96
97 rpcif_manual_xfer(hyperbus->rpc.dev);
98}
99
100static void rpcif_hb_copy_from(struct hyperbus_device *hbdev, void *to,
101 unsigned long from, ssize_t len)
102{
103 struct rpcif_hyperbus *hyperbus =
104 container_of(hbdev, struct rpcif_hyperbus, hbdev);
105
106 rpcif_hb_prepare_read(&hyperbus->rpc, to, from, len);
107
108 rpcif_dirmap_read(hyperbus->rpc.dev, from, len, to);
109}
110
111static const struct hyperbus_ops rpcif_hb_ops = {
112 .read16 = rpcif_hb_read16,
113 .write16 = rpcif_hb_write16,
114 .copy_from = rpcif_hb_copy_from,
115};
116
117static int rpcif_hb_probe(struct platform_device *pdev)
118{
119 struct device *dev = &pdev->dev;
120 struct rpcif_hyperbus *hyperbus;
121 int error;
122
123 hyperbus = devm_kzalloc(dev, sizeof(*hyperbus), GFP_KERNEL);
124 if (!hyperbus)
125 return -ENOMEM;
126
127 error = rpcif_sw_init(&hyperbus->rpc, pdev->dev.parent);
128 if (error)
129 return error;
130
131 platform_set_drvdata(pdev, hyperbus);
132
133 pm_runtime_enable(hyperbus->rpc.dev);
134
135 error = rpcif_hw_init(hyperbus->rpc.dev, true);
136 if (error)
137 goto out_disable_rpm;
138
139 hyperbus->hbdev.map.size = hyperbus->rpc.size;
140 hyperbus->hbdev.map.virt = hyperbus->rpc.dirmap;
141
142 hyperbus->ctlr.dev = dev;
143 hyperbus->ctlr.ops = &rpcif_hb_ops;
144 hyperbus->hbdev.ctlr = &hyperbus->ctlr;
145 hyperbus->hbdev.np = of_get_next_child(pdev->dev.parent->of_node, NULL);
146 error = hyperbus_register_device(&hyperbus->hbdev);
147 if (error)
148 goto out_disable_rpm;
149
150 return 0;
151
152out_disable_rpm:
153 pm_runtime_disable(hyperbus->rpc.dev);
154 return error;
155}
156
157static void rpcif_hb_remove(struct platform_device *pdev)
158{
159 struct rpcif_hyperbus *hyperbus = platform_get_drvdata(pdev);
160
161 hyperbus_unregister_device(&hyperbus->hbdev);
162
163 pm_runtime_disable(hyperbus->rpc.dev);
164}
165
166static struct platform_driver rpcif_platform_driver = {
167 .probe = rpcif_hb_probe,
168 .remove_new = rpcif_hb_remove,
169 .driver = {
170 .name = "rpc-if-hyperflash",
171 },
172};
173
174module_platform_driver(rpcif_platform_driver);
175
176MODULE_DESCRIPTION("Renesas RPC-IF HyperFlash driver");
177MODULE_LICENSE("GPL v2");
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Linux driver for RPC-IF HyperFlash
4 *
5 * Copyright (C) 2019-2020 Cogent Embedded, Inc.
6 */
7
8#include <linux/err.h>
9#include <linux/kernel.h>
10#include <linux/module.h>
11#include <linux/mtd/hyperbus.h>
12#include <linux/mtd/mtd.h>
13#include <linux/mux/consumer.h>
14#include <linux/of.h>
15#include <linux/platform_device.h>
16#include <linux/types.h>
17
18#include <memory/renesas-rpc-if.h>
19
20struct rpcif_hyperbus {
21 struct rpcif rpc;
22 struct hyperbus_ctlr ctlr;
23 struct hyperbus_device hbdev;
24};
25
26static const struct rpcif_op rpcif_op_tmpl = {
27 .cmd = {
28 .buswidth = 8,
29 .ddr = true,
30 },
31 .ocmd = {
32 .buswidth = 8,
33 .ddr = true,
34 },
35 .addr = {
36 .nbytes = 1,
37 .buswidth = 8,
38 .ddr = true,
39 },
40 .data = {
41 .buswidth = 8,
42 .ddr = true,
43 },
44};
45
46static void rpcif_hb_prepare_read(struct rpcif *rpc, void *to,
47 unsigned long from, ssize_t len)
48{
49 struct rpcif_op op = rpcif_op_tmpl;
50
51 op.cmd.opcode = HYPERBUS_RW_READ | HYPERBUS_AS_MEM;
52 op.addr.val = from >> 1;
53 op.dummy.buswidth = 1;
54 op.dummy.ncycles = 15;
55 op.data.dir = RPCIF_DATA_IN;
56 op.data.nbytes = len;
57 op.data.buf.in = to;
58
59 rpcif_prepare(rpc, &op, NULL, NULL);
60}
61
62static void rpcif_hb_prepare_write(struct rpcif *rpc, unsigned long to,
63 void *from, ssize_t len)
64{
65 struct rpcif_op op = rpcif_op_tmpl;
66
67 op.cmd.opcode = HYPERBUS_RW_WRITE | HYPERBUS_AS_MEM;
68 op.addr.val = to >> 1;
69 op.data.dir = RPCIF_DATA_OUT;
70 op.data.nbytes = len;
71 op.data.buf.out = from;
72
73 rpcif_prepare(rpc, &op, NULL, NULL);
74}
75
76static u16 rpcif_hb_read16(struct hyperbus_device *hbdev, unsigned long addr)
77{
78 struct rpcif_hyperbus *hyperbus =
79 container_of(hbdev, struct rpcif_hyperbus, hbdev);
80 map_word data;
81
82 rpcif_hb_prepare_read(&hyperbus->rpc, &data, addr, 2);
83
84 rpcif_manual_xfer(&hyperbus->rpc);
85
86 return data.x[0];
87}
88
89static void rpcif_hb_write16(struct hyperbus_device *hbdev, unsigned long addr,
90 u16 data)
91{
92 struct rpcif_hyperbus *hyperbus =
93 container_of(hbdev, struct rpcif_hyperbus, hbdev);
94
95 rpcif_hb_prepare_write(&hyperbus->rpc, addr, &data, 2);
96
97 rpcif_manual_xfer(&hyperbus->rpc);
98}
99
100static void rpcif_hb_copy_from(struct hyperbus_device *hbdev, void *to,
101 unsigned long from, ssize_t len)
102{
103 struct rpcif_hyperbus *hyperbus =
104 container_of(hbdev, struct rpcif_hyperbus, hbdev);
105
106 rpcif_hb_prepare_read(&hyperbus->rpc, to, from, len);
107
108 rpcif_dirmap_read(&hyperbus->rpc, from, len, to);
109}
110
111static const struct hyperbus_ops rpcif_hb_ops = {
112 .read16 = rpcif_hb_read16,
113 .write16 = rpcif_hb_write16,
114 .copy_from = rpcif_hb_copy_from,
115};
116
117static int rpcif_hb_probe(struct platform_device *pdev)
118{
119 struct device *dev = &pdev->dev;
120 struct rpcif_hyperbus *hyperbus;
121 int error;
122
123 hyperbus = devm_kzalloc(dev, sizeof(*hyperbus), GFP_KERNEL);
124 if (!hyperbus)
125 return -ENOMEM;
126
127 error = rpcif_sw_init(&hyperbus->rpc, pdev->dev.parent);
128 if (error)
129 return error;
130
131 platform_set_drvdata(pdev, hyperbus);
132
133 rpcif_enable_rpm(&hyperbus->rpc);
134
135 error = rpcif_hw_init(&hyperbus->rpc, true);
136 if (error)
137 goto out_disable_rpm;
138
139 hyperbus->hbdev.map.size = hyperbus->rpc.size;
140 hyperbus->hbdev.map.virt = hyperbus->rpc.dirmap;
141
142 hyperbus->ctlr.dev = dev;
143 hyperbus->ctlr.ops = &rpcif_hb_ops;
144 hyperbus->hbdev.ctlr = &hyperbus->ctlr;
145 hyperbus->hbdev.np = of_get_next_child(pdev->dev.parent->of_node, NULL);
146 error = hyperbus_register_device(&hyperbus->hbdev);
147 if (error)
148 goto out_disable_rpm;
149
150 return 0;
151
152out_disable_rpm:
153 rpcif_disable_rpm(&hyperbus->rpc);
154 return error;
155}
156
157static int rpcif_hb_remove(struct platform_device *pdev)
158{
159 struct rpcif_hyperbus *hyperbus = platform_get_drvdata(pdev);
160
161 hyperbus_unregister_device(&hyperbus->hbdev);
162
163 rpcif_disable_rpm(&hyperbus->rpc);
164
165 return 0;
166}
167
168static struct platform_driver rpcif_platform_driver = {
169 .probe = rpcif_hb_probe,
170 .remove = rpcif_hb_remove,
171 .driver = {
172 .name = "rpc-if-hyperflash",
173 },
174};
175
176module_platform_driver(rpcif_platform_driver);
177
178MODULE_DESCRIPTION("Renesas RPC-IF HyperFlash driver");
179MODULE_LICENSE("GPL v2");