Commit | Line | Data |
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f534e52f WG |
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> | |
f534e52f WG |
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 | ||
35 | MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>"); | |
36 | MODULE_DESCRIPTION("Socket-CAN driver for SJA1000 on the platform bus"); | |
37 | MODULE_LICENSE("GPL v2"); | |
38 | ||
986917b7 | 39 | static u8 sp_read_reg8(const struct sja1000_priv *priv, int reg) |
f534e52f | 40 | { |
255a9154 | 41 | return ioread8(priv->reg_base + reg); |
f534e52f WG |
42 | } |
43 | ||
986917b7 | 44 | static void sp_write_reg8(const struct sja1000_priv *priv, int reg, u8 val) |
f534e52f | 45 | { |
255a9154 | 46 | iowrite8(val, priv->reg_base + reg); |
f534e52f WG |
47 | } |
48 | ||
986917b7 YY |
49 | static u8 sp_read_reg16(const struct sja1000_priv *priv, int reg) |
50 | { | |
51 | return ioread8(priv->reg_base + reg * 2); | |
52 | } | |
53 | ||
54 | static void sp_write_reg16(const struct sja1000_priv *priv, int reg, u8 val) | |
55 | { | |
56 | iowrite8(val, priv->reg_base + reg * 2); | |
57 | } | |
58 | ||
59 | static u8 sp_read_reg32(const struct sja1000_priv *priv, int reg) | |
60 | { | |
61 | return ioread8(priv->reg_base + reg * 4); | |
62 | } | |
63 | ||
64 | static void sp_write_reg32(const struct sja1000_priv *priv, int reg, u8 val) | |
65 | { | |
66 | iowrite8(val, priv->reg_base + reg * 4); | |
67 | } | |
68 | ||
f534e52f WG |
69 | static 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 | ||
f534e52f | 111 | dev->irq = res_irq->start; |
da3d50ef SS |
112 | priv->irq_flags = res_irq->flags & IRQF_TRIGGER_MASK; |
113 | if (res_irq->flags & IORESOURCE_IRQ_SHAREABLE) | |
114 | priv->irq_flags |= IRQF_SHARED; | |
255a9154 | 115 | priv->reg_base = addr; |
56e6943b WG |
116 | /* The CAN clock frequency is half the oscillator clock frequency */ |
117 | priv->can.clock.freq = pdata->osc_freq / 2; | |
f534e52f WG |
118 | priv->ocr = pdata->ocr; |
119 | priv->cdr = pdata->cdr; | |
120 | ||
986917b7 YY |
121 | switch (res_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 | ||
f534e52f WG |
137 | dev_set_drvdata(&pdev->dev, dev); |
138 | SET_NETDEV_DEV(dev, &pdev->dev); | |
139 | ||
140 | err = register_sja1000dev(dev); | |
141 | if (err) { | |
142 | dev_err(&pdev->dev, "registering %s failed (err=%d)\n", | |
143 | DRV_NAME, err); | |
144 | goto exit_free; | |
145 | } | |
146 | ||
255a9154 WG |
147 | dev_info(&pdev->dev, "%s device registered (reg_base=%p, irq=%d)\n", |
148 | DRV_NAME, priv->reg_base, dev->irq); | |
f534e52f WG |
149 | return 0; |
150 | ||
151 | exit_free: | |
152 | free_sja1000dev(dev); | |
153 | exit_iounmap: | |
154 | iounmap(addr); | |
155 | exit_release: | |
156 | release_mem_region(res_mem->start, resource_size(res_mem)); | |
157 | exit: | |
158 | return err; | |
159 | } | |
160 | ||
161 | static int sp_remove(struct platform_device *pdev) | |
162 | { | |
163 | struct net_device *dev = dev_get_drvdata(&pdev->dev); | |
255a9154 | 164 | struct sja1000_priv *priv = netdev_priv(dev); |
f534e52f WG |
165 | struct resource *res; |
166 | ||
167 | unregister_sja1000dev(dev); | |
168 | dev_set_drvdata(&pdev->dev, NULL); | |
169 | ||
255a9154 WG |
170 | if (priv->reg_base) |
171 | iounmap(priv->reg_base); | |
f534e52f WG |
172 | |
173 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
174 | release_mem_region(res->start, resource_size(res)); | |
175 | ||
176 | free_sja1000dev(dev); | |
177 | ||
178 | return 0; | |
179 | } | |
180 | ||
181 | static struct platform_driver sp_driver = { | |
182 | .probe = sp_probe, | |
183 | .remove = sp_remove, | |
184 | .driver = { | |
185 | .name = DRV_NAME, | |
186 | .owner = THIS_MODULE, | |
187 | }, | |
188 | }; | |
189 | ||
871d3372 | 190 | module_platform_driver(sp_driver); |