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f534e52f WG |
1 | /* |
2 | * Copyright (C) 2005 Sascha Hauer, Pengutronix | |
3 | * Copyright (C) 2007 Wolfgang Grandegger <wg@grandegger.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the version 2 of the GNU General Public License | |
7 | * as published by the Free Software Foundation | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
05780d98 | 15 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
f534e52f WG |
16 | */ |
17 | ||
18 | #include <linux/kernel.h> | |
19 | #include <linux/module.h> | |
20 | #include <linux/interrupt.h> | |
21 | #include <linux/netdevice.h> | |
22 | #include <linux/delay.h> | |
23 | #include <linux/pci.h> | |
24 | #include <linux/platform_device.h> | |
25 | #include <linux/irq.h> | |
f534e52f WG |
26 | #include <linux/can/dev.h> |
27 | #include <linux/can/platform/sja1000.h> | |
28 | #include <linux/io.h> | |
02729c3d FV |
29 | #include <linux/of.h> |
30 | #include <linux/of_irq.h> | |
f534e52f WG |
31 | |
32 | #include "sja1000.h" | |
33 | ||
34 | #define DRV_NAME "sja1000_platform" | |
02729c3d | 35 | #define SP_CAN_CLOCK (16000000 / 2) |
f534e52f WG |
36 | |
37 | MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>"); | |
02729c3d | 38 | MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>"); |
f534e52f | 39 | MODULE_DESCRIPTION("Socket-CAN driver for SJA1000 on the platform bus"); |
d8c4386d | 40 | MODULE_ALIAS("platform:" DRV_NAME); |
f534e52f WG |
41 | MODULE_LICENSE("GPL v2"); |
42 | ||
986917b7 | 43 | static u8 sp_read_reg8(const struct sja1000_priv *priv, int reg) |
f534e52f | 44 | { |
255a9154 | 45 | return ioread8(priv->reg_base + reg); |
f534e52f WG |
46 | } |
47 | ||
986917b7 | 48 | static void sp_write_reg8(const struct sja1000_priv *priv, int reg, u8 val) |
f534e52f | 49 | { |
255a9154 | 50 | iowrite8(val, priv->reg_base + reg); |
f534e52f WG |
51 | } |
52 | ||
986917b7 YY |
53 | static u8 sp_read_reg16(const struct sja1000_priv *priv, int reg) |
54 | { | |
55 | return ioread8(priv->reg_base + reg * 2); | |
56 | } | |
57 | ||
58 | static void sp_write_reg16(const struct sja1000_priv *priv, int reg, u8 val) | |
59 | { | |
60 | iowrite8(val, priv->reg_base + reg * 2); | |
61 | } | |
62 | ||
63 | static u8 sp_read_reg32(const struct sja1000_priv *priv, int reg) | |
64 | { | |
65 | return ioread8(priv->reg_base + reg * 4); | |
66 | } | |
67 | ||
68 | static void sp_write_reg32(const struct sja1000_priv *priv, int reg, u8 val) | |
69 | { | |
70 | iowrite8(val, priv->reg_base + reg * 4); | |
71 | } | |
72 | ||
02729c3d FV |
73 | static void sp_populate(struct sja1000_priv *priv, |
74 | struct sja1000_platform_data *pdata, | |
75 | unsigned long resource_mem_flags) | |
76 | { | |
77 | /* The CAN clock frequency is half the oscillator clock frequency */ | |
78 | priv->can.clock.freq = pdata->osc_freq / 2; | |
79 | priv->ocr = pdata->ocr; | |
80 | priv->cdr = pdata->cdr; | |
81 | ||
82 | switch (resource_mem_flags & IORESOURCE_MEM_TYPE_MASK) { | |
83 | case IORESOURCE_MEM_32BIT: | |
84 | priv->read_reg = sp_read_reg32; | |
85 | priv->write_reg = sp_write_reg32; | |
86 | break; | |
87 | case IORESOURCE_MEM_16BIT: | |
88 | priv->read_reg = sp_read_reg16; | |
89 | priv->write_reg = sp_write_reg16; | |
90 | break; | |
91 | case IORESOURCE_MEM_8BIT: | |
92 | default: | |
93 | priv->read_reg = sp_read_reg8; | |
94 | priv->write_reg = sp_write_reg8; | |
95 | break; | |
96 | } | |
97 | } | |
98 | ||
99 | static void sp_populate_of(struct sja1000_priv *priv, struct device_node *of) | |
f534e52f WG |
100 | { |
101 | int err; | |
02729c3d FV |
102 | u32 prop; |
103 | ||
b18ec27c FV |
104 | err = of_property_read_u32(of, "reg-io-width", &prop); |
105 | if (err) | |
106 | prop = 1; /* 8 bit is default */ | |
107 | ||
108 | switch (prop) { | |
109 | case 4: | |
110 | priv->read_reg = sp_read_reg32; | |
111 | priv->write_reg = sp_write_reg32; | |
112 | break; | |
113 | case 2: | |
114 | priv->read_reg = sp_read_reg16; | |
115 | priv->write_reg = sp_write_reg16; | |
116 | break; | |
117 | case 1: /* fallthrough */ | |
118 | default: | |
119 | priv->read_reg = sp_read_reg8; | |
120 | priv->write_reg = sp_write_reg8; | |
121 | } | |
02729c3d FV |
122 | |
123 | err = of_property_read_u32(of, "nxp,external-clock-frequency", &prop); | |
124 | if (!err) | |
125 | priv->can.clock.freq = prop / 2; | |
126 | else | |
127 | priv->can.clock.freq = SP_CAN_CLOCK; /* default */ | |
128 | ||
129 | err = of_property_read_u32(of, "nxp,tx-output-mode", &prop); | |
130 | if (!err) | |
131 | priv->ocr |= prop & OCR_MODE_MASK; | |
132 | else | |
133 | priv->ocr |= OCR_MODE_NORMAL; /* default */ | |
134 | ||
135 | err = of_property_read_u32(of, "nxp,tx-output-config", &prop); | |
136 | if (!err) | |
137 | priv->ocr |= (prop << OCR_TX_SHIFT) & OCR_TX_MASK; | |
138 | else | |
139 | priv->ocr |= OCR_TX0_PULLDOWN; /* default */ | |
140 | ||
141 | err = of_property_read_u32(of, "nxp,clock-out-frequency", &prop); | |
142 | if (!err && prop) { | |
143 | u32 divider = priv->can.clock.freq * 2 / prop; | |
144 | ||
145 | if (divider > 1) | |
146 | priv->cdr |= divider / 2 - 1; | |
147 | else | |
148 | priv->cdr |= CDR_CLKOUT_MASK; | |
149 | } else { | |
150 | priv->cdr |= CDR_CLK_OFF; /* default */ | |
151 | } | |
152 | ||
153 | if (!of_property_read_bool(of, "nxp,no-comparator-bypass")) | |
154 | priv->cdr |= CDR_CBP; /* default */ | |
155 | } | |
156 | ||
157 | static int sp_probe(struct platform_device *pdev) | |
158 | { | |
159 | int err, irq = 0; | |
f534e52f WG |
160 | void __iomem *addr; |
161 | struct net_device *dev; | |
162 | struct sja1000_priv *priv; | |
02729c3d | 163 | struct resource *res_mem, *res_irq = NULL; |
f534e52f | 164 | struct sja1000_platform_data *pdata; |
02729c3d | 165 | struct device_node *of = pdev->dev.of_node; |
f534e52f | 166 | |
ecd78d97 | 167 | pdata = dev_get_platdata(&pdev->dev); |
02729c3d | 168 | if (!pdata && !of) { |
f534e52f | 169 | dev_err(&pdev->dev, "No platform data provided!\n"); |
342180f7 | 170 | return -ENODEV; |
f534e52f WG |
171 | } |
172 | ||
173 | res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
02729c3d | 174 | if (!res_mem) |
342180f7 | 175 | return -ENODEV; |
f534e52f | 176 | |
342180f7 FV |
177 | if (!devm_request_mem_region(&pdev->dev, res_mem->start, |
178 | resource_size(res_mem), DRV_NAME)) | |
179 | return -EBUSY; | |
f534e52f | 180 | |
342180f7 FV |
181 | addr = devm_ioremap_nocache(&pdev->dev, res_mem->start, |
182 | resource_size(res_mem)); | |
183 | if (!addr) | |
184 | return -ENOMEM; | |
f534e52f | 185 | |
02729c3d FV |
186 | if (of) |
187 | irq = irq_of_parse_and_map(of, 0); | |
188 | else | |
189 | res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0); | |
190 | ||
191 | if (!irq && !res_irq) | |
192 | return -ENODEV; | |
193 | ||
f534e52f | 194 | dev = alloc_sja1000dev(0); |
342180f7 FV |
195 | if (!dev) |
196 | return -ENOMEM; | |
f534e52f WG |
197 | priv = netdev_priv(dev); |
198 | ||
02729c3d FV |
199 | if (res_irq) { |
200 | irq = res_irq->start; | |
201 | priv->irq_flags = res_irq->flags & IRQF_TRIGGER_MASK; | |
202 | if (res_irq->flags & IORESOURCE_IRQ_SHAREABLE) | |
203 | priv->irq_flags |= IRQF_SHARED; | |
204 | } else { | |
205 | priv->irq_flags = IRQF_SHARED; | |
206 | } | |
207 | ||
208 | dev->irq = irq; | |
255a9154 | 209 | priv->reg_base = addr; |
f534e52f | 210 | |
02729c3d FV |
211 | if (of) |
212 | sp_populate_of(priv, of); | |
213 | else | |
214 | sp_populate(priv, pdata, res_mem->flags); | |
986917b7 | 215 | |
00e4bbc8 | 216 | platform_set_drvdata(pdev, dev); |
f534e52f WG |
217 | SET_NETDEV_DEV(dev, &pdev->dev); |
218 | ||
219 | err = register_sja1000dev(dev); | |
220 | if (err) { | |
221 | dev_err(&pdev->dev, "registering %s failed (err=%d)\n", | |
222 | DRV_NAME, err); | |
223 | goto exit_free; | |
224 | } | |
225 | ||
255a9154 WG |
226 | dev_info(&pdev->dev, "%s device registered (reg_base=%p, irq=%d)\n", |
227 | DRV_NAME, priv->reg_base, dev->irq); | |
f534e52f WG |
228 | return 0; |
229 | ||
230 | exit_free: | |
231 | free_sja1000dev(dev); | |
f534e52f WG |
232 | return err; |
233 | } | |
234 | ||
235 | static int sp_remove(struct platform_device *pdev) | |
236 | { | |
00e4bbc8 | 237 | struct net_device *dev = platform_get_drvdata(pdev); |
f534e52f WG |
238 | |
239 | unregister_sja1000dev(dev); | |
f534e52f WG |
240 | free_sja1000dev(dev); |
241 | ||
242 | return 0; | |
243 | } | |
244 | ||
486e9570 | 245 | static const struct of_device_id sp_of_table[] = { |
02729c3d FV |
246 | {.compatible = "nxp,sja1000"}, |
247 | {}, | |
248 | }; | |
249 | MODULE_DEVICE_TABLE(of, sp_of_table); | |
250 | ||
f534e52f WG |
251 | static struct platform_driver sp_driver = { |
252 | .probe = sp_probe, | |
253 | .remove = sp_remove, | |
254 | .driver = { | |
255 | .name = DRV_NAME, | |
02729c3d | 256 | .of_match_table = sp_of_table, |
f534e52f WG |
257 | }, |
258 | }; | |
259 | ||
871d3372 | 260 | module_platform_driver(sp_driver); |