Loading...
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2005 Sascha Hauer, Pengutronix
4 * Copyright (C) 2007 Wolfgang Grandegger <wg@grandegger.com>
5 */
6
7#include <linux/kernel.h>
8#include <linux/module.h>
9#include <linux/interrupt.h>
10#include <linux/netdevice.h>
11#include <linux/delay.h>
12#include <linux/pci.h>
13#include <linux/platform_device.h>
14#include <linux/irq.h>
15#include <linux/can/dev.h>
16#include <linux/can/platform/sja1000.h>
17#include <linux/clk.h>
18#include <linux/io.h>
19#include <linux/of.h>
20#include <linux/of_device.h>
21
22#include "sja1000.h"
23
24#define DRV_NAME "sja1000_platform"
25#define SP_CAN_CLOCK (16000000 / 2)
26
27MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
28MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");
29MODULE_DESCRIPTION("Socket-CAN driver for SJA1000 on the platform bus");
30MODULE_ALIAS("platform:" DRV_NAME);
31MODULE_LICENSE("GPL v2");
32
33struct sja1000_of_data {
34 size_t priv_sz;
35 void (*init)(struct sja1000_priv *priv, struct device_node *of);
36};
37
38struct technologic_priv {
39 spinlock_t io_lock;
40};
41
42static u8 sp_read_reg8(const struct sja1000_priv *priv, int reg)
43{
44 return ioread8(priv->reg_base + reg);
45}
46
47static void sp_write_reg8(const struct sja1000_priv *priv, int reg, u8 val)
48{
49 iowrite8(val, priv->reg_base + reg);
50}
51
52static u8 sp_read_reg16(const struct sja1000_priv *priv, int reg)
53{
54 return ioread8(priv->reg_base + reg * 2);
55}
56
57static void sp_write_reg16(const struct sja1000_priv *priv, int reg, u8 val)
58{
59 iowrite8(val, priv->reg_base + reg * 2);
60}
61
62static u8 sp_read_reg32(const struct sja1000_priv *priv, int reg)
63{
64 return ioread8(priv->reg_base + reg * 4);
65}
66
67static void sp_write_reg32(const struct sja1000_priv *priv, int reg, u8 val)
68{
69 iowrite8(val, priv->reg_base + reg * 4);
70}
71
72static u8 sp_technologic_read_reg16(const struct sja1000_priv *priv, int reg)
73{
74 struct technologic_priv *tp = priv->priv;
75 unsigned long flags;
76 u8 val;
77
78 spin_lock_irqsave(&tp->io_lock, flags);
79 iowrite16(reg, priv->reg_base + 0);
80 val = ioread16(priv->reg_base + 2);
81 spin_unlock_irqrestore(&tp->io_lock, flags);
82
83 return val;
84}
85
86static void sp_technologic_write_reg16(const struct sja1000_priv *priv,
87 int reg, u8 val)
88{
89 struct technologic_priv *tp = priv->priv;
90 unsigned long flags;
91
92 spin_lock_irqsave(&tp->io_lock, flags);
93 iowrite16(reg, priv->reg_base + 0);
94 iowrite16(val, priv->reg_base + 2);
95 spin_unlock_irqrestore(&tp->io_lock, flags);
96}
97
98static void sp_technologic_init(struct sja1000_priv *priv, struct device_node *of)
99{
100 struct technologic_priv *tp = priv->priv;
101
102 priv->read_reg = sp_technologic_read_reg16;
103 priv->write_reg = sp_technologic_write_reg16;
104 spin_lock_init(&tp->io_lock);
105}
106
107static void sp_rzn1_init(struct sja1000_priv *priv, struct device_node *of)
108{
109 priv->flags = SJA1000_QUIRK_NO_CDR_REG;
110}
111
112static void sp_populate(struct sja1000_priv *priv,
113 struct sja1000_platform_data *pdata,
114 unsigned long resource_mem_flags)
115{
116 /* The CAN clock frequency is half the oscillator clock frequency */
117 priv->can.clock.freq = pdata->osc_freq / 2;
118 priv->ocr = pdata->ocr;
119 priv->cdr = pdata->cdr;
120
121 switch (resource_mem_flags & IORESOURCE_MEM_TYPE_MASK) {
122 case IORESOURCE_MEM_32BIT:
123 priv->read_reg = sp_read_reg32;
124 priv->write_reg = sp_write_reg32;
125 break;
126 case IORESOURCE_MEM_16BIT:
127 priv->read_reg = sp_read_reg16;
128 priv->write_reg = sp_write_reg16;
129 break;
130 case IORESOURCE_MEM_8BIT:
131 default:
132 priv->read_reg = sp_read_reg8;
133 priv->write_reg = sp_write_reg8;
134 break;
135 }
136}
137
138static void sp_populate_of(struct sja1000_priv *priv, struct device_node *of)
139{
140 int err;
141 u32 prop;
142
143 err = of_property_read_u32(of, "reg-io-width", &prop);
144 if (err)
145 prop = 1; /* 8 bit is default */
146
147 switch (prop) {
148 case 4:
149 priv->read_reg = sp_read_reg32;
150 priv->write_reg = sp_write_reg32;
151 break;
152 case 2:
153 priv->read_reg = sp_read_reg16;
154 priv->write_reg = sp_write_reg16;
155 break;
156 case 1:
157 default:
158 priv->read_reg = sp_read_reg8;
159 priv->write_reg = sp_write_reg8;
160 }
161
162 if (!priv->can.clock.freq) {
163 err = of_property_read_u32(of, "nxp,external-clock-frequency", &prop);
164 if (!err)
165 priv->can.clock.freq = prop / 2;
166 else
167 priv->can.clock.freq = SP_CAN_CLOCK; /* default */
168 }
169
170 err = of_property_read_u32(of, "nxp,tx-output-mode", &prop);
171 if (!err)
172 priv->ocr |= prop & OCR_MODE_MASK;
173 else
174 priv->ocr |= OCR_MODE_NORMAL; /* default */
175
176 err = of_property_read_u32(of, "nxp,tx-output-config", &prop);
177 if (!err)
178 priv->ocr |= (prop << OCR_TX_SHIFT) & OCR_TX_MASK;
179 else
180 priv->ocr |= OCR_TX0_PULLDOWN; /* default */
181
182 err = of_property_read_u32(of, "nxp,clock-out-frequency", &prop);
183 if (!err && prop) {
184 u32 divider = priv->can.clock.freq * 2 / prop;
185
186 if (divider > 1)
187 priv->cdr |= divider / 2 - 1;
188 else
189 priv->cdr |= CDR_CLKOUT_MASK;
190 } else {
191 priv->cdr |= CDR_CLK_OFF; /* default */
192 }
193
194 if (!of_property_read_bool(of, "nxp,no-comparator-bypass"))
195 priv->cdr |= CDR_CBP; /* default */
196}
197
198static struct sja1000_of_data technologic_data = {
199 .priv_sz = sizeof(struct technologic_priv),
200 .init = sp_technologic_init,
201};
202
203static struct sja1000_of_data renesas_data = {
204 .init = sp_rzn1_init,
205};
206
207static const struct of_device_id sp_of_table[] = {
208 { .compatible = "nxp,sja1000", .data = NULL, },
209 { .compatible = "renesas,rzn1-sja1000", .data = &renesas_data, },
210 { .compatible = "technologic,sja1000", .data = &technologic_data, },
211 { /* sentinel */ },
212};
213MODULE_DEVICE_TABLE(of, sp_of_table);
214
215static int sp_probe(struct platform_device *pdev)
216{
217 int err, irq = 0;
218 void __iomem *addr;
219 struct net_device *dev;
220 struct sja1000_priv *priv;
221 struct resource *res_mem, *res_irq = NULL;
222 struct sja1000_platform_data *pdata;
223 struct device_node *of = pdev->dev.of_node;
224 const struct sja1000_of_data *of_data = NULL;
225 size_t priv_sz = 0;
226 struct clk *clk;
227
228 pdata = dev_get_platdata(&pdev->dev);
229 if (!pdata && !of) {
230 dev_err(&pdev->dev, "No platform data provided!\n");
231 return -ENODEV;
232 }
233
234 res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
235 if (!res_mem)
236 return -ENODEV;
237
238 if (!devm_request_mem_region(&pdev->dev, res_mem->start,
239 resource_size(res_mem), DRV_NAME))
240 return -EBUSY;
241
242 addr = devm_ioremap(&pdev->dev, res_mem->start,
243 resource_size(res_mem));
244 if (!addr)
245 return -ENOMEM;
246
247 if (of) {
248 irq = platform_get_irq(pdev, 0);
249 if (irq < 0)
250 return irq;
251
252 clk = devm_clk_get_optional_enabled(&pdev->dev, NULL);
253 if (IS_ERR(clk))
254 return dev_err_probe(&pdev->dev, PTR_ERR(clk),
255 "CAN clk operation failed");
256 } else {
257 res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
258 if (!res_irq)
259 return -ENODEV;
260 }
261
262 of_data = device_get_match_data(&pdev->dev);
263 if (of_data)
264 priv_sz = of_data->priv_sz;
265
266 dev = alloc_sja1000dev(priv_sz);
267 if (!dev)
268 return -ENOMEM;
269 priv = netdev_priv(dev);
270
271 if (res_irq) {
272 irq = res_irq->start;
273 priv->irq_flags = res_irq->flags & IRQF_TRIGGER_MASK;
274 if (res_irq->flags & IORESOURCE_IRQ_SHAREABLE)
275 priv->irq_flags |= IRQF_SHARED;
276 } else {
277 priv->irq_flags = IRQF_SHARED;
278 }
279
280 dev->irq = irq;
281 priv->reg_base = addr;
282
283 if (of) {
284 if (clk) {
285 priv->can.clock.freq = clk_get_rate(clk) / 2;
286 if (!priv->can.clock.freq) {
287 err = -EINVAL;
288 dev_err(&pdev->dev, "Zero CAN clk rate");
289 goto exit_free;
290 }
291 }
292
293 sp_populate_of(priv, of);
294
295 if (of_data && of_data->init)
296 of_data->init(priv, of);
297 } else {
298 sp_populate(priv, pdata, res_mem->flags);
299 }
300
301 platform_set_drvdata(pdev, dev);
302 SET_NETDEV_DEV(dev, &pdev->dev);
303
304 err = register_sja1000dev(dev);
305 if (err) {
306 dev_err(&pdev->dev, "registering %s failed (err=%d)\n",
307 DRV_NAME, err);
308 goto exit_free;
309 }
310
311 dev_info(&pdev->dev, "%s device registered (reg_base=%p, irq=%d)\n",
312 DRV_NAME, priv->reg_base, dev->irq);
313 return 0;
314
315 exit_free:
316 free_sja1000dev(dev);
317 return err;
318}
319
320static int sp_remove(struct platform_device *pdev)
321{
322 struct net_device *dev = platform_get_drvdata(pdev);
323
324 unregister_sja1000dev(dev);
325 free_sja1000dev(dev);
326
327 return 0;
328}
329
330static struct platform_driver sp_driver = {
331 .probe = sp_probe,
332 .remove = sp_remove,
333 .driver = {
334 .name = DRV_NAME,
335 .of_match_table = sp_of_table,
336 },
337};
338
339module_platform_driver(sp_driver);
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
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 */
18
19#include <linux/kernel.h>
20#include <linux/module.h>
21#include <linux/interrupt.h>
22#include <linux/netdevice.h>
23#include <linux/delay.h>
24#include <linux/pci.h>
25#include <linux/platform_device.h>
26#include <linux/irq.h>
27#include <linux/can/dev.h>
28#include <linux/can/platform/sja1000.h>
29#include <linux/io.h>
30
31#include "sja1000.h"
32
33#define DRV_NAME "sja1000_platform"
34
35MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
36MODULE_DESCRIPTION("Socket-CAN driver for SJA1000 on the platform bus");
37MODULE_LICENSE("GPL v2");
38
39static u8 sp_read_reg8(const struct sja1000_priv *priv, int reg)
40{
41 return ioread8(priv->reg_base + reg);
42}
43
44static void sp_write_reg8(const struct sja1000_priv *priv, int reg, u8 val)
45{
46 iowrite8(val, priv->reg_base + reg);
47}
48
49static u8 sp_read_reg16(const struct sja1000_priv *priv, int reg)
50{
51 return ioread8(priv->reg_base + reg * 2);
52}
53
54static void sp_write_reg16(const struct sja1000_priv *priv, int reg, u8 val)
55{
56 iowrite8(val, priv->reg_base + reg * 2);
57}
58
59static u8 sp_read_reg32(const struct sja1000_priv *priv, int reg)
60{
61 return ioread8(priv->reg_base + reg * 4);
62}
63
64static void sp_write_reg32(const struct sja1000_priv *priv, int reg, u8 val)
65{
66 iowrite8(val, priv->reg_base + reg * 4);
67}
68
69static int sp_probe(struct platform_device *pdev)
70{
71 int err;
72 void __iomem *addr;
73 struct net_device *dev;
74 struct sja1000_priv *priv;
75 struct resource *res_mem, *res_irq;
76 struct sja1000_platform_data *pdata;
77
78 pdata = pdev->dev.platform_data;
79 if (!pdata) {
80 dev_err(&pdev->dev, "No platform data provided!\n");
81 err = -ENODEV;
82 goto exit;
83 }
84
85 res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
86 res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
87 if (!res_mem || !res_irq) {
88 err = -ENODEV;
89 goto exit;
90 }
91
92 if (!request_mem_region(res_mem->start, resource_size(res_mem),
93 DRV_NAME)) {
94 err = -EBUSY;
95 goto exit;
96 }
97
98 addr = ioremap_nocache(res_mem->start, resource_size(res_mem));
99 if (!addr) {
100 err = -ENOMEM;
101 goto exit_release;
102 }
103
104 dev = alloc_sja1000dev(0);
105 if (!dev) {
106 err = -ENOMEM;
107 goto exit_iounmap;
108 }
109 priv = netdev_priv(dev);
110
111 dev->irq = res_irq->start;
112 priv->irq_flags = res_irq->flags & (IRQF_TRIGGER_MASK | IRQF_SHARED);
113 priv->reg_base = addr;
114 /* The CAN clock frequency is half the oscillator clock frequency */
115 priv->can.clock.freq = pdata->osc_freq / 2;
116 priv->ocr = pdata->ocr;
117 priv->cdr = pdata->cdr;
118
119 switch (res_mem->flags & IORESOURCE_MEM_TYPE_MASK) {
120 case IORESOURCE_MEM_32BIT:
121 priv->read_reg = sp_read_reg32;
122 priv->write_reg = sp_write_reg32;
123 break;
124 case IORESOURCE_MEM_16BIT:
125 priv->read_reg = sp_read_reg16;
126 priv->write_reg = sp_write_reg16;
127 break;
128 case IORESOURCE_MEM_8BIT:
129 default:
130 priv->read_reg = sp_read_reg8;
131 priv->write_reg = sp_write_reg8;
132 break;
133 }
134
135 dev_set_drvdata(&pdev->dev, dev);
136 SET_NETDEV_DEV(dev, &pdev->dev);
137
138 err = register_sja1000dev(dev);
139 if (err) {
140 dev_err(&pdev->dev, "registering %s failed (err=%d)\n",
141 DRV_NAME, err);
142 goto exit_free;
143 }
144
145 dev_info(&pdev->dev, "%s device registered (reg_base=%p, irq=%d)\n",
146 DRV_NAME, priv->reg_base, dev->irq);
147 return 0;
148
149 exit_free:
150 free_sja1000dev(dev);
151 exit_iounmap:
152 iounmap(addr);
153 exit_release:
154 release_mem_region(res_mem->start, resource_size(res_mem));
155 exit:
156 return err;
157}
158
159static int sp_remove(struct platform_device *pdev)
160{
161 struct net_device *dev = dev_get_drvdata(&pdev->dev);
162 struct sja1000_priv *priv = netdev_priv(dev);
163 struct resource *res;
164
165 unregister_sja1000dev(dev);
166 dev_set_drvdata(&pdev->dev, NULL);
167
168 if (priv->reg_base)
169 iounmap(priv->reg_base);
170
171 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
172 release_mem_region(res->start, resource_size(res));
173
174 free_sja1000dev(dev);
175
176 return 0;
177}
178
179static struct platform_driver sp_driver = {
180 .probe = sp_probe,
181 .remove = sp_remove,
182 .driver = {
183 .name = DRV_NAME,
184 .owner = THIS_MODULE,
185 },
186};
187
188static int __init sp_init(void)
189{
190 return platform_driver_register(&sp_driver);
191}
192
193static void __exit sp_exit(void)
194{
195 platform_driver_unregister(&sp_driver);
196}
197
198module_init(sp_init);
199module_exit(sp_exit);