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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>
26#include <linux/can/dev.h>
27#include <linux/can/platform/sja1000.h>
28#include <linux/io.h>
29#include <linux/of.h>
30#include <linux/of_device.h>
31#include <linux/of_irq.h>
32
33#include "sja1000.h"
34
35#define DRV_NAME "sja1000_platform"
36#define SP_CAN_CLOCK (16000000 / 2)
37
38MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
39MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");
40MODULE_DESCRIPTION("Socket-CAN driver for SJA1000 on the platform bus");
41MODULE_ALIAS("platform:" DRV_NAME);
42MODULE_LICENSE("GPL v2");
43
44struct sja1000_of_data {
45 size_t priv_sz;
46 int (*init)(struct sja1000_priv *priv, struct device_node *of);
47};
48
49struct technologic_priv {
50 spinlock_t io_lock;
51};
52
53static u8 sp_read_reg8(const struct sja1000_priv *priv, int reg)
54{
55 return ioread8(priv->reg_base + reg);
56}
57
58static void sp_write_reg8(const struct sja1000_priv *priv, int reg, u8 val)
59{
60 iowrite8(val, priv->reg_base + reg);
61}
62
63static u8 sp_read_reg16(const struct sja1000_priv *priv, int reg)
64{
65 return ioread8(priv->reg_base + reg * 2);
66}
67
68static void sp_write_reg16(const struct sja1000_priv *priv, int reg, u8 val)
69{
70 iowrite8(val, priv->reg_base + reg * 2);
71}
72
73static u8 sp_read_reg32(const struct sja1000_priv *priv, int reg)
74{
75 return ioread8(priv->reg_base + reg * 4);
76}
77
78static void sp_write_reg32(const struct sja1000_priv *priv, int reg, u8 val)
79{
80 iowrite8(val, priv->reg_base + reg * 4);
81}
82
83static u8 sp_technologic_read_reg16(const struct sja1000_priv *priv, int reg)
84{
85 struct technologic_priv *tp = priv->priv;
86 unsigned long flags;
87 u8 val;
88
89 spin_lock_irqsave(&tp->io_lock, flags);
90 iowrite16(reg, priv->reg_base + 0);
91 val = ioread16(priv->reg_base + 2);
92 spin_unlock_irqrestore(&tp->io_lock, flags);
93
94 return val;
95}
96
97static void sp_technologic_write_reg16(const struct sja1000_priv *priv,
98 int reg, u8 val)
99{
100 struct technologic_priv *tp = priv->priv;
101 unsigned long flags;
102
103 spin_lock_irqsave(&tp->io_lock, flags);
104 iowrite16(reg, priv->reg_base + 0);
105 iowrite16(val, priv->reg_base + 2);
106 spin_unlock_irqrestore(&tp->io_lock, flags);
107}
108
109static int sp_technologic_init(struct sja1000_priv *priv, struct device_node *of)
110{
111 struct technologic_priv *tp = priv->priv;
112
113 priv->read_reg = sp_technologic_read_reg16;
114 priv->write_reg = sp_technologic_write_reg16;
115 spin_lock_init(&tp->io_lock);
116
117 return 0;
118}
119
120static void sp_populate(struct sja1000_priv *priv,
121 struct sja1000_platform_data *pdata,
122 unsigned long resource_mem_flags)
123{
124
125 priv->can.clock.freq = pdata->osc_freq / 2;
126 priv->ocr = pdata->ocr;
127 priv->cdr = pdata->cdr;
128
129 switch (resource_mem_flags & IORESOURCE_MEM_TYPE_MASK) {
130 case IORESOURCE_MEM_32BIT:
131 priv->read_reg = sp_read_reg32;
132 priv->write_reg = sp_write_reg32;
133 break;
134 case IORESOURCE_MEM_16BIT:
135 priv->read_reg = sp_read_reg16;
136 priv->write_reg = sp_write_reg16;
137 break;
138 case IORESOURCE_MEM_8BIT:
139 default:
140 priv->read_reg = sp_read_reg8;
141 priv->write_reg = sp_write_reg8;
142 break;
143 }
144}
145
146static void sp_populate_of(struct sja1000_priv *priv, struct device_node *of)
147{
148 int err;
149 u32 prop;
150
151 err = of_property_read_u32(of, "reg-io-width", &prop);
152 if (err)
153 prop = 1;
154
155 switch (prop) {
156 case 4:
157 priv->read_reg = sp_read_reg32;
158 priv->write_reg = sp_write_reg32;
159 break;
160 case 2:
161 priv->read_reg = sp_read_reg16;
162 priv->write_reg = sp_write_reg16;
163 break;
164 case 1:
165 default:
166 priv->read_reg = sp_read_reg8;
167 priv->write_reg = sp_write_reg8;
168 }
169
170 err = of_property_read_u32(of, "nxp,external-clock-frequency", &prop);
171 if (!err)
172 priv->can.clock.freq = prop / 2;
173 else
174 priv->can.clock.freq = SP_CAN_CLOCK;
175
176 err = of_property_read_u32(of, "nxp,tx-output-mode", &prop);
177 if (!err)
178 priv->ocr |= prop & OCR_MODE_MASK;
179 else
180 priv->ocr |= OCR_MODE_NORMAL;
181
182 err = of_property_read_u32(of, "nxp,tx-output-config", &prop);
183 if (!err)
184 priv->ocr |= (prop << OCR_TX_SHIFT) & OCR_TX_MASK;
185 else
186 priv->ocr |= OCR_TX0_PULLDOWN;
187
188 err = of_property_read_u32(of, "nxp,clock-out-frequency", &prop);
189 if (!err && prop) {
190 u32 divider = priv->can.clock.freq * 2 / prop;
191
192 if (divider > 1)
193 priv->cdr |= divider / 2 - 1;
194 else
195 priv->cdr |= CDR_CLKOUT_MASK;
196 } else {
197 priv->cdr |= CDR_CLK_OFF;
198 }
199
200 if (!of_property_read_bool(of, "nxp,no-comparator-bypass"))
201 priv->cdr |= CDR_CBP;
202}
203
204static struct sja1000_of_data technologic_data = {
205 .priv_sz = sizeof(struct technologic_priv),
206 .init = sp_technologic_init,
207};
208
209static const struct of_device_id sp_of_table[] = {
210 { .compatible = "nxp,sja1000", .data = NULL, },
211 { .compatible = "technologic,sja1000", .data = &technologic_data, },
212 { },
213};
214MODULE_DEVICE_TABLE(of, sp_of_table);
215
216static int sp_probe(struct platform_device *pdev)
217{
218 int err, irq = 0;
219 void __iomem *addr;
220 struct net_device *dev;
221 struct sja1000_priv *priv;
222 struct resource *res_mem, *res_irq = NULL;
223 struct sja1000_platform_data *pdata;
224 struct device_node *of = pdev->dev.of_node;
225 const struct of_device_id *of_id;
226 const struct sja1000_of_data *of_data = NULL;
227 size_t priv_sz = 0;
228
229 pdata = dev_get_platdata(&pdev->dev);
230 if (!pdata && !of) {
231 dev_err(&pdev->dev, "No platform data provided!\n");
232 return -ENODEV;
233 }
234
235 res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
236 if (!res_mem)
237 return -ENODEV;
238
239 if (!devm_request_mem_region(&pdev->dev, res_mem->start,
240 resource_size(res_mem), DRV_NAME))
241 return -EBUSY;
242
243 addr = devm_ioremap_nocache(&pdev->dev, res_mem->start,
244 resource_size(res_mem));
245 if (!addr)
246 return -ENOMEM;
247
248 if (of)
249 irq = irq_of_parse_and_map(of, 0);
250 else
251 res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
252
253 if (!irq && !res_irq)
254 return -ENODEV;
255
256 of_id = of_match_device(sp_of_table, &pdev->dev);
257 if (of_id && of_id->data) {
258 of_data = of_id->data;
259 priv_sz = of_data->priv_sz;
260 }
261
262 dev = alloc_sja1000dev(priv_sz);
263 if (!dev)
264 return -ENOMEM;
265 priv = netdev_priv(dev);
266
267 if (res_irq) {
268 irq = res_irq->start;
269 priv->irq_flags = res_irq->flags & IRQF_TRIGGER_MASK;
270 if (res_irq->flags & IORESOURCE_IRQ_SHAREABLE)
271 priv->irq_flags |= IRQF_SHARED;
272 } else {
273 priv->irq_flags = IRQF_SHARED;
274 }
275
276 dev->irq = irq;
277 priv->reg_base = addr;
278
279 if (of) {
280 sp_populate_of(priv, of);
281
282 if (of_data && of_data->init) {
283 err = of_data->init(priv, of);
284 if (err)
285 goto exit_free;
286 }
287 } else {
288 sp_populate(priv, pdata, res_mem->flags);
289 }
290
291 platform_set_drvdata(pdev, dev);
292 SET_NETDEV_DEV(dev, &pdev->dev);
293
294 err = register_sja1000dev(dev);
295 if (err) {
296 dev_err(&pdev->dev, "registering %s failed (err=%d)\n",
297 DRV_NAME, err);
298 goto exit_free;
299 }
300
301 dev_info(&pdev->dev, "%s device registered (reg_base=%p, irq=%d)\n",
302 DRV_NAME, priv->reg_base, dev->irq);
303 return 0;
304
305 exit_free:
306 free_sja1000dev(dev);
307 return err;
308}
309
310static int sp_remove(struct platform_device *pdev)
311{
312 struct net_device *dev = platform_get_drvdata(pdev);
313
314 unregister_sja1000dev(dev);
315 free_sja1000dev(dev);
316
317 return 0;
318}
319
320static struct platform_driver sp_driver = {
321 .probe = sp_probe,
322 .remove = sp_remove,
323 .driver = {
324 .name = DRV_NAME,
325 .of_match_table = sp_of_table,
326 },
327};
328
329module_platform_driver(sp_driver);
330
