1 // SPDX-License-Identifier: GPL-2.0
2 //
3 // RPC-IF SPI/QSPI/Octa driver
4 //
5 // Copyright (C) 2018 ~ 2019 Renesas Solutions Corp.
6 // Copyright (C) 2019 Macronix International Co., Ltd.
7 // Copyright (C) 2019 - 2020 Cogent Embedded, Inc.
8 //
9
10 #include <linux/module.h>
11 #include <linux/platform_device.h>
12 #include <linux/spi/spi.h>
13 #include <linux/spi/spi-mem.h>
14
15 #include <memory/renesas-rpc-if.h>
16
17 #include <linux/unaligned.h>
18
rpcif_spi_mem_prepare(struct spi_device * spi_dev,const struct spi_mem_op * spi_op,u64 * offs,size_t * len)19 static void rpcif_spi_mem_prepare(struct spi_device *spi_dev,
20 const struct spi_mem_op *spi_op,
21 u64 *offs, size_t *len)
22 {
23 struct rpcif *rpc = spi_controller_get_devdata(spi_dev->controller);
24 struct rpcif_op rpc_op = { };
25
26 rpc_op.cmd.opcode = spi_op->cmd.opcode;
27 rpc_op.cmd.buswidth = spi_op->cmd.buswidth;
28
29 if (spi_op->addr.nbytes) {
30 rpc_op.addr.buswidth = spi_op->addr.buswidth;
31 rpc_op.addr.nbytes = spi_op->addr.nbytes;
32 rpc_op.addr.val = spi_op->addr.val;
33 }
34
35 if (spi_op->dummy.nbytes) {
36 rpc_op.dummy.buswidth = spi_op->dummy.buswidth;
37 rpc_op.dummy.ncycles = spi_op->dummy.nbytes * 8 /
38 spi_op->dummy.buswidth;
39 }
40
41 if (spi_op->data.nbytes || (offs && len)) {
42 rpc_op.data.buswidth = spi_op->data.buswidth;
43 rpc_op.data.nbytes = spi_op->data.nbytes;
44 switch (spi_op->data.dir) {
45 case SPI_MEM_DATA_IN:
46 rpc_op.data.dir = RPCIF_DATA_IN;
47 rpc_op.data.buf.in = spi_op->data.buf.in;
48 break;
49 case SPI_MEM_DATA_OUT:
50 rpc_op.data.dir = RPCIF_DATA_OUT;
51 rpc_op.data.buf.out = spi_op->data.buf.out;
52 break;
53 case SPI_MEM_NO_DATA:
54 rpc_op.data.dir = RPCIF_NO_DATA;
55 break;
56 }
57 } else {
58 rpc_op.data.dir = RPCIF_NO_DATA;
59 }
60
61 rpcif_prepare(rpc->dev, &rpc_op, offs, len);
62 }
63
rpcif_spi_mem_supports_op(struct spi_mem * mem,const struct spi_mem_op * op)64 static bool rpcif_spi_mem_supports_op(struct spi_mem *mem,
65 const struct spi_mem_op *op)
66 {
67 if (!spi_mem_default_supports_op(mem, op))
68 return false;
69
70 if (op->data.buswidth > 4 || op->addr.buswidth > 4 ||
71 op->dummy.buswidth > 4 || op->cmd.buswidth > 4 ||
72 op->addr.nbytes > 4)
73 return false;
74
75 return true;
76 }
77
rpcif_spi_mem_dirmap_read(struct spi_mem_dirmap_desc * desc,u64 offs,size_t len,void * buf)78 static ssize_t rpcif_spi_mem_dirmap_read(struct spi_mem_dirmap_desc *desc,
79 u64 offs, size_t len, void *buf)
80 {
81 struct rpcif *rpc =
82 spi_controller_get_devdata(desc->mem->spi->controller);
83
84 if (offs + desc->info.offset + len > U32_MAX)
85 return -EINVAL;
86
87 rpcif_spi_mem_prepare(desc->mem->spi, &desc->info.op_tmpl, &offs, &len);
88
89 return rpcif_dirmap_read(rpc->dev, offs, len, buf);
90 }
91
rpcif_spi_mem_dirmap_create(struct spi_mem_dirmap_desc * desc)92 static int rpcif_spi_mem_dirmap_create(struct spi_mem_dirmap_desc *desc)
93 {
94 struct rpcif *rpc =
95 spi_controller_get_devdata(desc->mem->spi->controller);
96
97 if (desc->info.offset + desc->info.length > U32_MAX)
98 return -EINVAL;
99
100 if (!rpcif_spi_mem_supports_op(desc->mem, &desc->info.op_tmpl))
101 return -EOPNOTSUPP;
102
103 if (!rpc->dirmap)
104 return -EOPNOTSUPP;
105
106 if (desc->info.op_tmpl.data.dir != SPI_MEM_DATA_IN)
107 return -EOPNOTSUPP;
108
109 return 0;
110 }
111
rpcif_spi_mem_exec_op(struct spi_mem * mem,const struct spi_mem_op * op)112 static int rpcif_spi_mem_exec_op(struct spi_mem *mem,
113 const struct spi_mem_op *op)
114 {
115 struct rpcif *rpc =
116 spi_controller_get_devdata(mem->spi->controller);
117
118 rpcif_spi_mem_prepare(mem->spi, op, NULL, NULL);
119
120 return rpcif_manual_xfer(rpc->dev);
121 }
122
123 static const struct spi_controller_mem_ops rpcif_spi_mem_ops = {
124 .supports_op = rpcif_spi_mem_supports_op,
125 .exec_op = rpcif_spi_mem_exec_op,
126 .dirmap_create = rpcif_spi_mem_dirmap_create,
127 .dirmap_read = rpcif_spi_mem_dirmap_read,
128 };
129
rpcif_spi_probe(struct platform_device * pdev)130 static int rpcif_spi_probe(struct platform_device *pdev)
131 {
132 struct device *parent = pdev->dev.parent;
133 struct spi_controller *ctlr;
134 struct rpcif *rpc;
135 int error;
136
137 ctlr = devm_spi_alloc_host(&pdev->dev, sizeof(*rpc));
138 if (!ctlr)
139 return -ENOMEM;
140
141 rpc = spi_controller_get_devdata(ctlr);
142 error = rpcif_sw_init(rpc, parent);
143 if (error)
144 return error;
145
146 platform_set_drvdata(pdev, ctlr);
147
148 ctlr->dev.of_node = parent->of_node;
149
150 pm_runtime_enable(rpc->dev);
151
152 ctlr->num_chipselect = 1;
153 ctlr->mem_ops = &rpcif_spi_mem_ops;
154
155 ctlr->bits_per_word_mask = SPI_BPW_MASK(8);
156 ctlr->mode_bits = SPI_CPOL | SPI_CPHA | SPI_TX_QUAD | SPI_RX_QUAD;
157 ctlr->flags = SPI_CONTROLLER_HALF_DUPLEX;
158
159 error = rpcif_hw_init(rpc->dev, false);
160 if (error)
161 goto out_disable_rpm;
162
163 error = spi_register_controller(ctlr);
164 if (error) {
165 dev_err(&pdev->dev, "spi_register_controller failed\n");
166 goto out_disable_rpm;
167 }
168
169 return 0;
170
171 out_disable_rpm:
172 pm_runtime_disable(rpc->dev);
173 return error;
174 }
175
rpcif_spi_remove(struct platform_device * pdev)176 static void rpcif_spi_remove(struct platform_device *pdev)
177 {
178 struct spi_controller *ctlr = platform_get_drvdata(pdev);
179 struct rpcif *rpc = spi_controller_get_devdata(ctlr);
180
181 spi_unregister_controller(ctlr);
182 pm_runtime_disable(rpc->dev);
183 }
184
rpcif_spi_suspend(struct device * dev)185 static int __maybe_unused rpcif_spi_suspend(struct device *dev)
186 {
187 struct spi_controller *ctlr = dev_get_drvdata(dev);
188
189 return spi_controller_suspend(ctlr);
190 }
191
rpcif_spi_resume(struct device * dev)192 static int __maybe_unused rpcif_spi_resume(struct device *dev)
193 {
194 struct spi_controller *ctlr = dev_get_drvdata(dev);
195
196 return spi_controller_resume(ctlr);
197 }
198
199 static SIMPLE_DEV_PM_OPS(rpcif_spi_pm_ops, rpcif_spi_suspend, rpcif_spi_resume);
200
201 static const struct platform_device_id rpc_if_spi_id_table[] = {
202 { .name = "rpc-if-spi" },
203 { /* sentinel */ }
204 };
205 MODULE_DEVICE_TABLE(platform, rpc_if_spi_id_table);
206
207 static struct platform_driver rpcif_spi_driver = {
208 .probe = rpcif_spi_probe,
209 .remove_new = rpcif_spi_remove,
210 .id_table = rpc_if_spi_id_table,
211 .driver = {
212 .name = "rpc-if-spi",
213 #ifdef CONFIG_PM_SLEEP
214 .pm = &rpcif_spi_pm_ops,
215 #endif
216 },
217 };
218 module_platform_driver(rpcif_spi_driver);
219
220 MODULE_DESCRIPTION("Renesas RPC-IF SPI driver");
221 MODULE_LICENSE("GPL v2");
222