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1/*
2 * Platform CAN bus driver for Bosch C_CAN controller
3 *
4 * Copyright (C) 2010 ST Microelectronics
5 * Bhupesh Sharma <bhupesh.sharma@st.com>
6 *
7 * Borrowed heavily from the C_CAN driver originally written by:
8 * Copyright (C) 2007
9 * - Sascha Hauer, Marc Kleine-Budde, Pengutronix <s.hauer@pengutronix.de>
10 * - Simon Kallweit, intefo AG <simon.kallweit@intefo.ch>
11 *
12 * Bosch C_CAN controller is compliant to CAN protocol version 2.0 part A and B.
13 * Bosch C_CAN user manual can be obtained from:
14 * http://www.semiconductors.bosch.de/media/en/pdf/ipmodules_1/c_can/
15 * users_manual_c_can.pdf
16 *
17 * This file is licensed under the terms of the GNU General Public
18 * License version 2. This program is licensed "as is" without any
19 * warranty of any kind, whether express or implied.
20 */
21
22#include <linux/kernel.h>
23#include <linux/module.h>
24#include <linux/interrupt.h>
25#include <linux/delay.h>
26#include <linux/netdevice.h>
27#include <linux/if_arp.h>
28#include <linux/if_ether.h>
29#include <linux/list.h>
30#include <linux/io.h>
31#include <linux/platform_device.h>
32#include <linux/clk.h>
33
34#include <linux/can/dev.h>
35
36#include "c_can.h"
37
38/*
39 * 16-bit c_can registers can be arranged differently in the memory
40 * architecture of different implementations. For example: 16-bit
41 * registers can be aligned to a 16-bit boundary or 32-bit boundary etc.
42 * Handle the same by providing a common read/write interface.
43 */
44static u16 c_can_plat_read_reg_aligned_to_16bit(struct c_can_priv *priv,
45 void *reg)
46{
47 return readw(reg);
48}
49
50static void c_can_plat_write_reg_aligned_to_16bit(struct c_can_priv *priv,
51 void *reg, u16 val)
52{
53 writew(val, reg);
54}
55
56static u16 c_can_plat_read_reg_aligned_to_32bit(struct c_can_priv *priv,
57 void *reg)
58{
59 return readw(reg + (long)reg - (long)priv->regs);
60}
61
62static void c_can_plat_write_reg_aligned_to_32bit(struct c_can_priv *priv,
63 void *reg, u16 val)
64{
65 writew(val, reg + (long)reg - (long)priv->regs);
66}
67
68static int __devinit c_can_plat_probe(struct platform_device *pdev)
69{
70 int ret;
71 void __iomem *addr;
72 struct net_device *dev;
73 struct c_can_priv *priv;
74 struct resource *mem;
75 int irq;
76#ifdef CONFIG_HAVE_CLK
77 struct clk *clk;
78
79 /* get the appropriate clk */
80 clk = clk_get(&pdev->dev, NULL);
81 if (IS_ERR(clk)) {
82 dev_err(&pdev->dev, "no clock defined\n");
83 ret = -ENODEV;
84 goto exit;
85 }
86#endif
87
88 /* get the platform data */
89 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
90 irq = platform_get_irq(pdev, 0);
91 if (!mem || irq <= 0) {
92 ret = -ENODEV;
93 goto exit_free_clk;
94 }
95
96 if (!request_mem_region(mem->start, resource_size(mem),
97 KBUILD_MODNAME)) {
98 dev_err(&pdev->dev, "resource unavailable\n");
99 ret = -ENODEV;
100 goto exit_free_clk;
101 }
102
103 addr = ioremap(mem->start, resource_size(mem));
104 if (!addr) {
105 dev_err(&pdev->dev, "failed to map can port\n");
106 ret = -ENOMEM;
107 goto exit_release_mem;
108 }
109
110 /* allocate the c_can device */
111 dev = alloc_c_can_dev();
112 if (!dev) {
113 ret = -ENOMEM;
114 goto exit_iounmap;
115 }
116
117 priv = netdev_priv(dev);
118
119 dev->irq = irq;
120 priv->regs = addr;
121#ifdef CONFIG_HAVE_CLK
122 priv->can.clock.freq = clk_get_rate(clk);
123 priv->priv = clk;
124#endif
125
126 switch (mem->flags & IORESOURCE_MEM_TYPE_MASK) {
127 case IORESOURCE_MEM_32BIT:
128 priv->read_reg = c_can_plat_read_reg_aligned_to_32bit;
129 priv->write_reg = c_can_plat_write_reg_aligned_to_32bit;
130 break;
131 case IORESOURCE_MEM_16BIT:
132 default:
133 priv->read_reg = c_can_plat_read_reg_aligned_to_16bit;
134 priv->write_reg = c_can_plat_write_reg_aligned_to_16bit;
135 break;
136 }
137
138 platform_set_drvdata(pdev, dev);
139 SET_NETDEV_DEV(dev, &pdev->dev);
140
141 ret = register_c_can_dev(dev);
142 if (ret) {
143 dev_err(&pdev->dev, "registering %s failed (err=%d)\n",
144 KBUILD_MODNAME, ret);
145 goto exit_free_device;
146 }
147
148 dev_info(&pdev->dev, "%s device registered (regs=%p, irq=%d)\n",
149 KBUILD_MODNAME, priv->regs, dev->irq);
150 return 0;
151
152exit_free_device:
153 platform_set_drvdata(pdev, NULL);
154 free_c_can_dev(dev);
155exit_iounmap:
156 iounmap(addr);
157exit_release_mem:
158 release_mem_region(mem->start, resource_size(mem));
159exit_free_clk:
160#ifdef CONFIG_HAVE_CLK
161 clk_put(clk);
162exit:
163#endif
164 dev_err(&pdev->dev, "probe failed\n");
165
166 return ret;
167}
168
169static int __devexit c_can_plat_remove(struct platform_device *pdev)
170{
171 struct net_device *dev = platform_get_drvdata(pdev);
172 struct c_can_priv *priv = netdev_priv(dev);
173 struct resource *mem;
174
175 unregister_c_can_dev(dev);
176 platform_set_drvdata(pdev, NULL);
177
178 free_c_can_dev(dev);
179 iounmap(priv->regs);
180
181 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
182 release_mem_region(mem->start, resource_size(mem));
183
184#ifdef CONFIG_HAVE_CLK
185 clk_put(priv->priv);
186#endif
187
188 return 0;
189}
190
191static struct platform_driver c_can_plat_driver = {
192 .driver = {
193 .name = KBUILD_MODNAME,
194 .owner = THIS_MODULE,
195 },
196 .probe = c_can_plat_probe,
197 .remove = __devexit_p(c_can_plat_remove),
198};
199
200static int __init c_can_plat_init(void)
201{
202 return platform_driver_register(&c_can_plat_driver);
203}
204module_init(c_can_plat_init);
205
206static void __exit c_can_plat_exit(void)
207{
208 platform_driver_unregister(&c_can_plat_driver);
209}
210module_exit(c_can_plat_exit);
211
212MODULE_AUTHOR("Bhupesh Sharma <bhupesh.sharma@st.com>");
213MODULE_LICENSE("GPL v2");
214MODULE_DESCRIPTION("Platform CAN bus driver for Bosch C_CAN controller");
1/*
2 * Platform CAN bus driver for Bosch C_CAN controller
3 *
4 * Copyright (C) 2010 ST Microelectronics
5 * Bhupesh Sharma <bhupesh.sharma@st.com>
6 *
7 * Borrowed heavily from the C_CAN driver originally written by:
8 * Copyright (C) 2007
9 * - Sascha Hauer, Marc Kleine-Budde, Pengutronix <s.hauer@pengutronix.de>
10 * - Simon Kallweit, intefo AG <simon.kallweit@intefo.ch>
11 *
12 * Bosch C_CAN controller is compliant to CAN protocol version 2.0 part A and B.
13 * Bosch C_CAN user manual can be obtained from:
14 * http://www.semiconductors.bosch.de/media/en/pdf/ipmodules_1/c_can/
15 * users_manual_c_can.pdf
16 *
17 * This file is licensed under the terms of the GNU General Public
18 * License version 2. This program is licensed "as is" without any
19 * warranty of any kind, whether express or implied.
20 */
21
22#include <linux/kernel.h>
23#include <linux/module.h>
24#include <linux/interrupt.h>
25#include <linux/delay.h>
26#include <linux/netdevice.h>
27#include <linux/if_arp.h>
28#include <linux/if_ether.h>
29#include <linux/list.h>
30#include <linux/io.h>
31#include <linux/platform_device.h>
32#include <linux/clk.h>
33
34#include <linux/can/dev.h>
35
36#include "c_can.h"
37
38/*
39 * 16-bit c_can registers can be arranged differently in the memory
40 * architecture of different implementations. For example: 16-bit
41 * registers can be aligned to a 16-bit boundary or 32-bit boundary etc.
42 * Handle the same by providing a common read/write interface.
43 */
44static u16 c_can_plat_read_reg_aligned_to_16bit(struct c_can_priv *priv,
45 void *reg)
46{
47 return readw(reg);
48}
49
50static void c_can_plat_write_reg_aligned_to_16bit(struct c_can_priv *priv,
51 void *reg, u16 val)
52{
53 writew(val, reg);
54}
55
56static u16 c_can_plat_read_reg_aligned_to_32bit(struct c_can_priv *priv,
57 void *reg)
58{
59 return readw(reg + (long)reg - (long)priv->regs);
60}
61
62static void c_can_plat_write_reg_aligned_to_32bit(struct c_can_priv *priv,
63 void *reg, u16 val)
64{
65 writew(val, reg + (long)reg - (long)priv->regs);
66}
67
68static int __devinit c_can_plat_probe(struct platform_device *pdev)
69{
70 int ret;
71 void __iomem *addr;
72 struct net_device *dev;
73 struct c_can_priv *priv;
74 struct resource *mem;
75 int irq;
76#ifdef CONFIG_HAVE_CLK
77 struct clk *clk;
78
79 /* get the appropriate clk */
80 clk = clk_get(&pdev->dev, NULL);
81 if (IS_ERR(clk)) {
82 dev_err(&pdev->dev, "no clock defined\n");
83 ret = -ENODEV;
84 goto exit;
85 }
86#endif
87
88 /* get the platform data */
89 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
90 irq = platform_get_irq(pdev, 0);
91 if (!mem || irq <= 0) {
92 ret = -ENODEV;
93 goto exit_free_clk;
94 }
95
96 if (!request_mem_region(mem->start, resource_size(mem),
97 KBUILD_MODNAME)) {
98 dev_err(&pdev->dev, "resource unavailable\n");
99 ret = -ENODEV;
100 goto exit_free_clk;
101 }
102
103 addr = ioremap(mem->start, resource_size(mem));
104 if (!addr) {
105 dev_err(&pdev->dev, "failed to map can port\n");
106 ret = -ENOMEM;
107 goto exit_release_mem;
108 }
109
110 /* allocate the c_can device */
111 dev = alloc_c_can_dev();
112 if (!dev) {
113 ret = -ENOMEM;
114 goto exit_iounmap;
115 }
116
117 priv = netdev_priv(dev);
118
119 dev->irq = irq;
120 priv->regs = addr;
121#ifdef CONFIG_HAVE_CLK
122 priv->can.clock.freq = clk_get_rate(clk);
123 priv->priv = clk;
124#endif
125
126 switch (mem->flags & IORESOURCE_MEM_TYPE_MASK) {
127 case IORESOURCE_MEM_32BIT:
128 priv->read_reg = c_can_plat_read_reg_aligned_to_32bit;
129 priv->write_reg = c_can_plat_write_reg_aligned_to_32bit;
130 break;
131 case IORESOURCE_MEM_16BIT:
132 default:
133 priv->read_reg = c_can_plat_read_reg_aligned_to_16bit;
134 priv->write_reg = c_can_plat_write_reg_aligned_to_16bit;
135 break;
136 }
137
138 platform_set_drvdata(pdev, dev);
139 SET_NETDEV_DEV(dev, &pdev->dev);
140
141 ret = register_c_can_dev(dev);
142 if (ret) {
143 dev_err(&pdev->dev, "registering %s failed (err=%d)\n",
144 KBUILD_MODNAME, ret);
145 goto exit_free_device;
146 }
147
148 dev_info(&pdev->dev, "%s device registered (regs=%p, irq=%d)\n",
149 KBUILD_MODNAME, priv->regs, dev->irq);
150 return 0;
151
152exit_free_device:
153 platform_set_drvdata(pdev, NULL);
154 free_c_can_dev(dev);
155exit_iounmap:
156 iounmap(addr);
157exit_release_mem:
158 release_mem_region(mem->start, resource_size(mem));
159exit_free_clk:
160#ifdef CONFIG_HAVE_CLK
161 clk_put(clk);
162exit:
163#endif
164 dev_err(&pdev->dev, "probe failed\n");
165
166 return ret;
167}
168
169static int __devexit c_can_plat_remove(struct platform_device *pdev)
170{
171 struct net_device *dev = platform_get_drvdata(pdev);
172 struct c_can_priv *priv = netdev_priv(dev);
173 struct resource *mem;
174
175 unregister_c_can_dev(dev);
176 platform_set_drvdata(pdev, NULL);
177
178 free_c_can_dev(dev);
179 iounmap(priv->regs);
180
181 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
182 release_mem_region(mem->start, resource_size(mem));
183
184#ifdef CONFIG_HAVE_CLK
185 clk_put(priv->priv);
186#endif
187
188 return 0;
189}
190
191static struct platform_driver c_can_plat_driver = {
192 .driver = {
193 .name = KBUILD_MODNAME,
194 .owner = THIS_MODULE,
195 },
196 .probe = c_can_plat_probe,
197 .remove = __devexit_p(c_can_plat_remove),
198};
199
200module_platform_driver(c_can_plat_driver);
201
202MODULE_AUTHOR("Bhupesh Sharma <bhupesh.sharma@st.com>");
203MODULE_LICENSE("GPL v2");
204MODULE_DESCRIPTION("Platform CAN bus driver for Bosch C_CAN controller");