Commit | Line | Data |
---|---|---|
caf6e49b VC |
1 | /** |
2 | * Marvell NFC-over-SPI driver: SPI interface related functions | |
3 | * | |
4 | * Copyright (C) 2015, Marvell International Ltd. | |
5 | * | |
6 | * This software file (the "File") is distributed by Marvell International | |
7 | * Ltd. under the terms of the GNU General Public License Version 2, June 1991 | |
8 | * (the "License"). You may use, redistribute and/or modify this File in | |
9 | * accordance with the terms and conditions of the License, a copy of which | |
10 | * is available on the worldwide web at | |
11 | * http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt. | |
12 | * | |
13 | * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE | |
14 | * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE | |
15 | * ARE EXPRESSLY DISCLAIMED. The License provides additional details about | |
16 | * this warranty disclaimer. | |
17 | **/ | |
18 | ||
19 | #include <linux/module.h> | |
20 | #include <linux/interrupt.h> | |
21 | #include <linux/pm_runtime.h> | |
22 | #include <linux/nfc.h> | |
23 | #include <linux/gpio.h> | |
24 | #include <linux/of_irq.h> | |
25 | #include <linux/of_gpio.h> | |
26 | #include <net/nfc/nci.h> | |
27 | #include <net/nfc/nci_core.h> | |
28 | #include <linux/spi/spi.h> | |
29 | #include <linux/gpio.h> | |
30 | #include "nfcmrvl.h" | |
31 | ||
32 | #define SPI_WAIT_HANDSHAKE 1 | |
33 | ||
34 | struct nfcmrvl_spi_drv_data { | |
35 | unsigned long flags; | |
36 | struct spi_device *spi; | |
37 | struct nci_spi *nci_spi; | |
38 | struct completion handshake_completion; | |
39 | struct nfcmrvl_private *priv; | |
40 | }; | |
41 | ||
42 | static irqreturn_t nfcmrvl_spi_int_irq_thread_fn(int irq, void *drv_data_ptr) | |
43 | { | |
44 | struct nfcmrvl_spi_drv_data *drv_data = drv_data_ptr; | |
45 | struct sk_buff *skb; | |
46 | ||
47 | /* | |
48 | * Special case where we are waiting for SPI_INT deassertion to start a | |
49 | * transfer. | |
50 | */ | |
51 | if (test_and_clear_bit(SPI_WAIT_HANDSHAKE, &drv_data->flags)) { | |
52 | complete(&drv_data->handshake_completion); | |
53 | return IRQ_HANDLED; | |
54 | } | |
55 | ||
56 | /* Normal case, SPI_INT deasserted by slave to trigger a master read */ | |
57 | ||
58 | skb = nci_spi_read(drv_data->nci_spi); | |
59 | if (!skb) { | |
60 | nfc_err(&drv_data->spi->dev, "failed to read spi packet"); | |
61 | return IRQ_HANDLED; | |
62 | } | |
63 | ||
64 | if (nfcmrvl_nci_recv_frame(drv_data->priv, skb) < 0) | |
65 | nfc_err(&drv_data->spi->dev, "corrupted RX packet"); | |
66 | ||
67 | return IRQ_HANDLED; | |
68 | } | |
69 | ||
70 | static int nfcmrvl_spi_nci_open(struct nfcmrvl_private *priv) | |
71 | { | |
72 | return 0; | |
73 | } | |
74 | ||
75 | static int nfcmrvl_spi_nci_close(struct nfcmrvl_private *priv) | |
76 | { | |
77 | return 0; | |
78 | } | |
79 | ||
80 | static int nfcmrvl_spi_nci_send(struct nfcmrvl_private *priv, | |
81 | struct sk_buff *skb) | |
82 | { | |
83 | struct nfcmrvl_spi_drv_data *drv_data = priv->drv_data; | |
84 | int err; | |
85 | ||
86 | /* Reinit completion for slave handshake */ | |
87 | reinit_completion(&drv_data->handshake_completion); | |
88 | set_bit(SPI_WAIT_HANDSHAKE, &drv_data->flags); | |
89 | ||
90 | /* | |
91 | * Append a dummy byte at the end of SPI frame. This is due to a | |
92 | * specific DMA implementation in the controller | |
93 | */ | |
94 | skb_put(skb, 1); | |
95 | ||
96 | /* Send the SPI packet */ | |
97 | err = nci_spi_send(drv_data->nci_spi, &drv_data->handshake_completion, | |
98 | skb); | |
99 | if (err != 0) { | |
100 | nfc_err(priv->dev, "spi_send failed %d", err); | |
101 | kfree_skb(skb); | |
102 | } | |
103 | return err; | |
104 | } | |
105 | ||
106 | static void nfcmrvl_spi_nci_update_config(struct nfcmrvl_private *priv, | |
107 | const void *param) | |
108 | { | |
109 | struct nfcmrvl_spi_drv_data *drv_data = priv->drv_data; | |
110 | const struct nfcmrvl_fw_spi_config *config = param; | |
111 | ||
112 | drv_data->nci_spi->xfer_speed_hz = config->clk; | |
113 | } | |
114 | ||
115 | static struct nfcmrvl_if_ops spi_ops = { | |
116 | .nci_open = nfcmrvl_spi_nci_open, | |
117 | .nci_close = nfcmrvl_spi_nci_close, | |
118 | .nci_send = nfcmrvl_spi_nci_send, | |
119 | .nci_update_config = nfcmrvl_spi_nci_update_config, | |
120 | }; | |
121 | ||
122 | static int nfcmrvl_spi_parse_dt(struct device_node *node, | |
123 | struct nfcmrvl_platform_data *pdata) | |
124 | { | |
125 | int ret; | |
126 | ||
127 | ret = nfcmrvl_parse_dt(node, pdata); | |
128 | if (ret < 0) { | |
129 | pr_err("Failed to get generic entries\n"); | |
130 | return ret; | |
131 | } | |
132 | ||
133 | ret = irq_of_parse_and_map(node, 0); | |
134 | if (ret < 0) { | |
135 | pr_err("Unable to get irq, error: %d\n", ret); | |
136 | return ret; | |
137 | } | |
138 | pdata->irq = ret; | |
139 | ||
140 | return 0; | |
141 | } | |
142 | ||
143 | static int nfcmrvl_spi_probe(struct spi_device *spi) | |
144 | { | |
145 | struct nfcmrvl_platform_data *pdata; | |
146 | struct nfcmrvl_platform_data config; | |
147 | struct nfcmrvl_spi_drv_data *drv_data; | |
148 | int ret = 0; | |
149 | ||
150 | drv_data = devm_kzalloc(&spi->dev, sizeof(*drv_data), GFP_KERNEL); | |
151 | if (!drv_data) | |
152 | return -ENOMEM; | |
153 | ||
154 | drv_data->spi = spi; | |
155 | drv_data->priv = NULL; | |
156 | spi_set_drvdata(spi, drv_data); | |
157 | ||
158 | pdata = spi->dev.platform_data; | |
159 | ||
160 | if (!pdata && spi->dev.of_node) | |
161 | if (nfcmrvl_spi_parse_dt(spi->dev.of_node, &config) == 0) | |
162 | pdata = &config; | |
163 | ||
164 | if (!pdata) | |
165 | return -EINVAL; | |
166 | ||
167 | ret = devm_request_threaded_irq(&drv_data->spi->dev, pdata->irq, | |
168 | NULL, nfcmrvl_spi_int_irq_thread_fn, | |
169 | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, | |
170 | "nfcmrvl_spi_int", drv_data); | |
171 | if (ret < 0) { | |
172 | nfc_err(&drv_data->spi->dev, "Unable to register IRQ handler"); | |
173 | return -ENODEV; | |
174 | } | |
175 | ||
176 | drv_data->priv = nfcmrvl_nci_register_dev(NFCMRVL_PHY_SPI, | |
177 | drv_data, &spi_ops, | |
178 | &drv_data->spi->dev, | |
179 | pdata); | |
180 | if (IS_ERR(drv_data->priv)) | |
181 | return PTR_ERR(drv_data->priv); | |
182 | ||
183 | drv_data->priv->support_fw_dnld = true; | |
184 | ||
185 | drv_data->nci_spi = nci_spi_allocate_spi(drv_data->spi, 0, 10, | |
186 | drv_data->priv->ndev); | |
187 | ||
188 | /* Init completion for slave handshake */ | |
189 | init_completion(&drv_data->handshake_completion); | |
190 | return 0; | |
191 | } | |
192 | ||
193 | static int nfcmrvl_spi_remove(struct spi_device *spi) | |
194 | { | |
195 | struct nfcmrvl_spi_drv_data *drv_data = spi_get_drvdata(spi); | |
196 | ||
197 | nfcmrvl_nci_unregister_dev(drv_data->priv); | |
198 | return 0; | |
199 | } | |
200 | ||
201 | static const struct of_device_id of_nfcmrvl_spi_match[] = { | |
202 | { .compatible = "mrvl,nfc-spi", }, | |
203 | {}, | |
204 | }; | |
205 | MODULE_DEVICE_TABLE(of, of_nfcmrvl_spi_match); | |
206 | ||
207 | static const struct spi_device_id nfcmrvl_spi_id_table[] = { | |
208 | { "nfcmrvl_spi", 0 }, | |
209 | { } | |
210 | }; | |
211 | MODULE_DEVICE_TABLE(spi, nfcmrvl_spi_id_table); | |
212 | ||
213 | static struct spi_driver nfcmrvl_spi_driver = { | |
214 | .probe = nfcmrvl_spi_probe, | |
215 | .remove = nfcmrvl_spi_remove, | |
216 | .id_table = nfcmrvl_spi_id_table, | |
217 | .driver = { | |
218 | .name = "nfcmrvl_spi", | |
219 | .owner = THIS_MODULE, | |
220 | .of_match_table = of_match_ptr(of_nfcmrvl_spi_match), | |
221 | }, | |
222 | }; | |
223 | ||
224 | module_spi_driver(nfcmrvl_spi_driver); | |
225 | ||
226 | MODULE_AUTHOR("Marvell International Ltd."); | |
227 | MODULE_DESCRIPTION("Marvell NFC-over-SPI driver"); | |
228 | MODULE_LICENSE("GPL v2"); |