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37#include <linux/kernel.h>
38#include <linux/module.h>
39#include <linux/interrupt.h>
40#include <linux/netdevice.h>
41#include <linux/delay.h>
42#include <linux/platform_device.h>
43#include <linux/of.h>
44#include <linux/can.h>
45#include <linux/can/dev.h>
46#include <linux/can/platform/cc770.h>
47
48#include "cc770.h"
49
50#define DRV_NAME "cc770_platform"
51
52MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");
53MODULE_DESCRIPTION("Socket-CAN driver for CC770 on the platform bus");
54MODULE_LICENSE("GPL v2");
55MODULE_ALIAS("platform:" DRV_NAME);
56
57#define CC770_PLATFORM_CAN_CLOCK 16000000
58
59static u8 cc770_platform_read_reg(const struct cc770_priv *priv, int reg)
60{
61 return ioread8(priv->reg_base + reg);
62}
63
64static void cc770_platform_write_reg(const struct cc770_priv *priv, int reg,
65 u8 val)
66{
67 iowrite8(val, priv->reg_base + reg);
68}
69
70static int cc770_get_of_node_data(struct platform_device *pdev,
71 struct cc770_priv *priv)
72{
73 struct device_node *np = pdev->dev.of_node;
74 const u32 *prop;
75 int prop_size;
76 u32 clkext;
77
78 prop = of_get_property(np, "bosch,external-clock-frequency",
79 &prop_size);
80 if (prop && (prop_size == sizeof(u32)))
81 clkext = *prop;
82 else
83 clkext = CC770_PLATFORM_CAN_CLOCK;
84 priv->can.clock.freq = clkext;
85
86
87 if (priv->can.clock.freq > 10000000) {
88 priv->cpu_interface |= CPUIF_DSC;
89 priv->can.clock.freq /= 2;
90 }
91
92
93 if (priv->can.clock.freq > 8000000)
94 priv->cpu_interface |= CPUIF_DMC;
95
96 if (of_get_property(np, "bosch,divide-memory-clock", NULL))
97 priv->cpu_interface |= CPUIF_DMC;
98 if (of_get_property(np, "bosch,iso-low-speed-mux", NULL))
99 priv->cpu_interface |= CPUIF_MUX;
100
101 if (!of_get_property(np, "bosch,no-comperator-bypass", NULL))
102 priv->bus_config |= BUSCFG_CBY;
103 if (of_get_property(np, "bosch,disconnect-rx0-input", NULL))
104 priv->bus_config |= BUSCFG_DR0;
105 if (of_get_property(np, "bosch,disconnect-rx1-input", NULL))
106 priv->bus_config |= BUSCFG_DR1;
107 if (of_get_property(np, "bosch,disconnect-tx1-output", NULL))
108 priv->bus_config |= BUSCFG_DT1;
109 if (of_get_property(np, "bosch,polarity-dominant", NULL))
110 priv->bus_config |= BUSCFG_POL;
111
112 prop = of_get_property(np, "bosch,clock-out-frequency", &prop_size);
113 if (prop && (prop_size == sizeof(u32)) && *prop > 0) {
114 u32 cdv = clkext / *prop;
115 int slew;
116
117 if (cdv > 0 && cdv < 16) {
118 priv->cpu_interface |= CPUIF_CEN;
119 priv->clkout |= (cdv - 1) & CLKOUT_CD_MASK;
120
121 prop = of_get_property(np, "bosch,slew-rate",
122 &prop_size);
123 if (prop && (prop_size == sizeof(u32))) {
124 slew = *prop;
125 } else {
126
127 slew = (CLKOUT_SL_MASK >>
128 CLKOUT_SL_SHIFT) -
129 ((cdv * clkext - 1) / 8000000);
130 if (slew < 0)
131 slew = 0;
132 }
133 priv->clkout |= (slew << CLKOUT_SL_SHIFT) &
134 CLKOUT_SL_MASK;
135 } else {
136 dev_dbg(&pdev->dev, "invalid clock-out-frequency\n");
137 }
138 }
139
140 return 0;
141}
142
143static int cc770_get_platform_data(struct platform_device *pdev,
144 struct cc770_priv *priv)
145{
146
147 struct cc770_platform_data *pdata = dev_get_platdata(&pdev->dev);
148
149 priv->can.clock.freq = pdata->osc_freq;
150 if (priv->cpu_interface & CPUIF_DSC)
151 priv->can.clock.freq /= 2;
152 priv->clkout = pdata->cor;
153 priv->bus_config = pdata->bcr;
154 priv->cpu_interface = pdata->cir;
155
156 return 0;
157}
158
159static int cc770_platform_probe(struct platform_device *pdev)
160{
161 struct net_device *dev;
162 struct cc770_priv *priv;
163 struct resource *mem;
164 resource_size_t mem_size;
165 void __iomem *base;
166 int err, irq;
167
168 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
169 irq = platform_get_irq(pdev, 0);
170 if (!mem || irq <= 0)
171 return -ENODEV;
172
173 mem_size = resource_size(mem);
174 if (!request_mem_region(mem->start, mem_size, pdev->name))
175 return -EBUSY;
176
177 base = ioremap(mem->start, mem_size);
178 if (!base) {
179 err = -ENOMEM;
180 goto exit_release_mem;
181 }
182
183 dev = alloc_cc770dev(0);
184 if (!dev) {
185 err = -ENOMEM;
186 goto exit_unmap_mem;
187 }
188
189 dev->irq = irq;
190 priv = netdev_priv(dev);
191 priv->read_reg = cc770_platform_read_reg;
192 priv->write_reg = cc770_platform_write_reg;
193 priv->irq_flags = IRQF_SHARED;
194 priv->reg_base = base;
195
196 if (pdev->dev.of_node)
197 err = cc770_get_of_node_data(pdev, priv);
198 else if (dev_get_platdata(&pdev->dev))
199 err = cc770_get_platform_data(pdev, priv);
200 else
201 err = -ENODEV;
202 if (err)
203 goto exit_free_cc770;
204
205 dev_dbg(&pdev->dev,
206 "reg_base=0x%p irq=%d clock=%d cpu_interface=0x%02x "
207 "bus_config=0x%02x clkout=0x%02x\n",
208 priv->reg_base, dev->irq, priv->can.clock.freq,
209 priv->cpu_interface, priv->bus_config, priv->clkout);
210
211 platform_set_drvdata(pdev, dev);
212 SET_NETDEV_DEV(dev, &pdev->dev);
213
214 err = register_cc770dev(dev);
215 if (err) {
216 dev_err(&pdev->dev,
217 "couldn't register CC700 device (err=%d)\n", err);
218 goto exit_free_cc770;
219 }
220
221 return 0;
222
223exit_free_cc770:
224 free_cc770dev(dev);
225exit_unmap_mem:
226 iounmap(base);
227exit_release_mem:
228 release_mem_region(mem->start, mem_size);
229
230 return err;
231}
232
233static int cc770_platform_remove(struct platform_device *pdev)
234{
235 struct net_device *dev = platform_get_drvdata(pdev);
236 struct cc770_priv *priv = netdev_priv(dev);
237 struct resource *mem;
238
239 unregister_cc770dev(dev);
240 iounmap(priv->reg_base);
241 free_cc770dev(dev);
242
243 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
244 release_mem_region(mem->start, resource_size(mem));
245
246 return 0;
247}
248
249static const struct of_device_id cc770_platform_table[] = {
250 {.compatible = "bosch,cc770"},
251 {.compatible = "intc,82527"},
252 {},
253};
254MODULE_DEVICE_TABLE(of, cc770_platform_table);
255
256static struct platform_driver cc770_platform_driver = {
257 .driver = {
258 .name = DRV_NAME,
259 .of_match_table = cc770_platform_table,
260 },
261 .probe = cc770_platform_probe,
262 .remove = cc770_platform_remove,
263};
264
265module_platform_driver(cc770_platform_driver);
266
