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-rw-r--r--drivers/net/can/Kconfig9
-rw-r--r--drivers/net/can/sja1000/Makefile1
-rw-r--r--drivers/net/can/sja1000/sja1000_of_platform.c233
3 files changed, 243 insertions, 0 deletions
diff --git a/drivers/net/can/Kconfig b/drivers/net/can/Kconfig
index cfd6c5a285fa..d5e18812bf49 100644
--- a/drivers/net/can/Kconfig
+++ b/drivers/net/can/Kconfig
@@ -51,6 +51,15 @@ config CAN_SJA1000_PLATFORM
51 boards from Phytec (http://www.phytec.de) like the PCM027, 51 boards from Phytec (http://www.phytec.de) like the PCM027,
52 PCM038. 52 PCM038.
53 53
54config CAN_SJA1000_OF_PLATFORM
55 depends on CAN_SJA1000 && PPC_OF
56 tristate "Generic OF Platform Bus based SJA1000 driver"
57 ---help---
58 This driver adds support for the SJA1000 chips connected to
59 the OpenFirmware "platform bus" found on embedded systems with
60 OpenFirmware bindings, e.g. if you have a PowerPC based system
61 you may want to enable this option.
62
54config CAN_EMS_PCI 63config CAN_EMS_PCI
55 tristate "EMS CPC-PCI and CPC-PCIe Card" 64 tristate "EMS CPC-PCI and CPC-PCIe Card"
56 depends on PCI && CAN_SJA1000 65 depends on PCI && CAN_SJA1000
diff --git a/drivers/net/can/sja1000/Makefile b/drivers/net/can/sja1000/Makefile
index d6c631f9e665..9d0c08da273c 100644
--- a/drivers/net/can/sja1000/Makefile
+++ b/drivers/net/can/sja1000/Makefile
@@ -4,6 +4,7 @@
4 4
5obj-$(CONFIG_CAN_SJA1000) += sja1000.o 5obj-$(CONFIG_CAN_SJA1000) += sja1000.o
6obj-$(CONFIG_CAN_SJA1000_PLATFORM) += sja1000_platform.o 6obj-$(CONFIG_CAN_SJA1000_PLATFORM) += sja1000_platform.o
7obj-$(CONFIG_CAN_SJA1000_OF_PLATFORM) += sja1000_of_platform.o
7obj-$(CONFIG_CAN_EMS_PCI) += ems_pci.o 8obj-$(CONFIG_CAN_EMS_PCI) += ems_pci.o
8obj-$(CONFIG_CAN_KVASER_PCI) += kvaser_pci.o 9obj-$(CONFIG_CAN_KVASER_PCI) += kvaser_pci.o
9 10
diff --git a/drivers/net/can/sja1000/sja1000_of_platform.c b/drivers/net/can/sja1000/sja1000_of_platform.c
new file mode 100644
index 000000000000..aa953fb4b8d0
--- /dev/null
+++ b/drivers/net/can/sja1000/sja1000_of_platform.c
@@ -0,0 +1,233 @@
1/*
2 * Driver for SJA1000 CAN controllers on the OpenFirmware platform bus
3 *
4 * Copyright (C) 2008-2009 Wolfgang Grandegger <wg@grandegger.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the version 2 of the GNU General Public License
8 * as published by the Free Software Foundation
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software Foundation,
17 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18 */
19
20/* This is a generic driver for SJA1000 chips on the OpenFirmware platform
21 * bus found on embedded PowerPC systems. You need a SJA1000 CAN node
22 * definition in your flattened device tree source (DTS) file similar to:
23 *
24 * can@3,100 {
25 * compatible = "nxp,sja1000";
26 * reg = <3 0x100 0x80>;
27 * interrupts = <2 0>;
28 * interrupt-parent = <&mpic>;
29 * nxp,external-clock-frequency = <16000000>;
30 * };
31 *
32 * See "Documentation/powerpc/dts-bindings/can/sja1000.txt" for further
33 * information.
34 */
35
36#include <linux/kernel.h>
37#include <linux/module.h>
38#include <linux/interrupt.h>
39#include <linux/netdevice.h>
40#include <linux/delay.h>
41#include <linux/can.h>
42#include <linux/can/dev.h>
43
44#include <linux/of_platform.h>
45#include <asm/prom.h>
46
47#include "sja1000.h"
48
49#define DRV_NAME "sja1000_of_platform"
50
51MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");
52MODULE_DESCRIPTION("Socket-CAN driver for SJA1000 on the OF platform bus");
53MODULE_LICENSE("GPL v2");
54
55#define SJA1000_OFP_CAN_CLOCK (16000000 / 2)
56
57#define SJA1000_OFP_OCR OCR_TX0_PULLDOWN
58#define SJA1000_OFP_CDR (CDR_CBP | CDR_CLK_OFF)
59
60static u8 sja1000_ofp_read_reg(const struct sja1000_priv *priv, int reg)
61{
62 return in_8(priv->reg_base + reg);
63}
64
65static void sja1000_ofp_write_reg(const struct sja1000_priv *priv,
66 int reg, u8 val)
67{
68 out_8(priv->reg_base + reg, val);
69}
70
71static int __devexit sja1000_ofp_remove(struct of_device *ofdev)
72{
73 struct net_device *dev = dev_get_drvdata(&ofdev->dev);
74 struct sja1000_priv *priv = netdev_priv(dev);
75 struct device_node *np = ofdev->node;
76 struct resource res;
77
78 dev_set_drvdata(&ofdev->dev, NULL);
79
80 unregister_sja1000dev(dev);
81 free_sja1000dev(dev);
82 iounmap(priv->reg_base);
83 irq_dispose_mapping(dev->irq);
84
85 of_address_to_resource(np, 0, &res);
86 release_mem_region(res.start, resource_size(&res));
87
88 return 0;
89}
90
91static int __devinit sja1000_ofp_probe(struct of_device *ofdev,
92 const struct of_device_id *id)
93{
94 struct device_node *np = ofdev->node;
95 struct net_device *dev;
96 struct sja1000_priv *priv;
97 struct resource res;
98 const u32 *prop;
99 int err, irq, res_size, prop_size;
100 void __iomem *base;
101
102 err = of_address_to_resource(np, 0, &res);
103 if (err) {
104 dev_err(&ofdev->dev, "invalid address\n");
105 return err;
106 }
107
108 res_size = resource_size(&res);
109
110 if (!request_mem_region(res.start, res_size, DRV_NAME)) {
111 dev_err(&ofdev->dev, "couldn't request %#x..%#x\n",
112 res.start, res.end);
113 return -EBUSY;
114 }
115
116 base = ioremap_nocache(res.start, res_size);
117 if (!base) {
118 dev_err(&ofdev->dev, "couldn't ioremap %#x..%#x\n",
119 res.start, res.end);
120 err = -ENOMEM;
121 goto exit_release_mem;
122 }
123
124 irq = irq_of_parse_and_map(np, 0);
125 if (irq == NO_IRQ) {
126 dev_err(&ofdev->dev, "no irq found\n");
127 err = -ENODEV;
128 goto exit_unmap_mem;
129 }
130
131 dev = alloc_sja1000dev(0);
132 if (!dev) {
133 err = -ENOMEM;
134 goto exit_dispose_irq;
135 }
136
137 priv = netdev_priv(dev);
138
139 priv->read_reg = sja1000_ofp_read_reg;
140 priv->write_reg = sja1000_ofp_write_reg;
141
142 prop = of_get_property(np, "nxp,external-clock-frequency", &prop_size);
143 if (prop && (prop_size == sizeof(u32)))
144 priv->can.clock.freq = *prop / 2;
145 else
146 priv->can.clock.freq = SJA1000_OFP_CAN_CLOCK; /* default */
147
148 prop = of_get_property(np, "nxp,tx-output-mode", &prop_size);
149 if (prop && (prop_size == sizeof(u32)))
150 priv->ocr |= *prop & OCR_MODE_MASK;
151 else
152 priv->ocr |= OCR_MODE_NORMAL; /* default */
153
154 prop = of_get_property(np, "nxp,tx-output-config", &prop_size);
155 if (prop && (prop_size == sizeof(u32)))
156 priv->ocr |= (*prop << OCR_TX_SHIFT) & OCR_TX_MASK;
157 else
158 priv->ocr |= OCR_TX0_PULLDOWN; /* default */
159
160 prop = of_get_property(np, "nxp,clock-out-frequency", &prop_size);
161 if (prop && (prop_size == sizeof(u32)) && *prop) {
162 u32 divider = priv->can.clock.freq * 2 / *prop;
163
164 if (divider > 1)
165 priv->cdr |= divider / 2 - 1;
166 else
167 priv->cdr |= CDR_CLKOUT_MASK;
168 } else {
169 priv->cdr |= CDR_CLK_OFF; /* default */
170 }
171
172 prop = of_get_property(np, "nxp,no-comparator-bypass", NULL);
173 if (!prop)
174 priv->cdr |= CDR_CBP; /* default */
175
176 priv->irq_flags = IRQF_SHARED;
177 priv->reg_base = base;
178
179 dev->irq = irq;
180
181 dev_info(&ofdev->dev,
182 "reg_base=0x%p irq=%d clock=%d ocr=0x%02x cdr=0x%02x\n",
183 priv->reg_base, dev->irq, priv->can.clock.freq,
184 priv->ocr, priv->cdr);
185
186 dev_set_drvdata(&ofdev->dev, dev);
187 SET_NETDEV_DEV(dev, &ofdev->dev);
188
189 err = register_sja1000dev(dev);
190 if (err) {
191 dev_err(&ofdev->dev, "registering %s failed (err=%d)\n",
192 DRV_NAME, err);
193 goto exit_free_sja1000;
194 }
195
196 return 0;
197
198exit_free_sja1000:
199 free_sja1000dev(dev);
200exit_dispose_irq:
201 irq_dispose_mapping(irq);
202exit_unmap_mem:
203 iounmap(base);
204exit_release_mem:
205 release_mem_region(res.start, res_size);
206
207 return err;
208}
209
210static struct of_device_id __devinitdata sja1000_ofp_table[] = {
211 {.compatible = "nxp,sja1000"},
212 {},
213};
214
215static struct of_platform_driver sja1000_ofp_driver = {
216 .owner = THIS_MODULE,
217 .name = DRV_NAME,
218 .probe = sja1000_ofp_probe,
219 .remove = __devexit_p(sja1000_ofp_remove),
220 .match_table = sja1000_ofp_table,
221};
222
223static int __init sja1000_ofp_init(void)
224{
225 return of_register_platform_driver(&sja1000_ofp_driver);
226}
227module_init(sja1000_ofp_init);
228
229static void __exit sja1000_ofp_exit(void)
230{
231 return of_unregister_platform_driver(&sja1000_ofp_driver);
232};
233module_exit(sja1000_ofp_exit);