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1da177e4 LT |
1 | /* |
2 | * linux/arch/arm/mach-pxa/ssp.c | |
3 | * | |
4 | * based on linux/arch/arm/mach-sa1100/ssp.c by Russell King | |
5 | * | |
6 | * Copyright (C) 2003 Russell King. | |
7 | * Copyright (C) 2003 Wolfson Microelectronics PLC | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | * | |
13 | * PXA2xx SSP driver. This provides the generic core for simple | |
14 | * IO-based SSP applications and allows easy port setup for DMA access. | |
15 | * | |
16 | * Author: Liam Girdwood <liam.girdwood@wolfsonmicro.com> | |
1da177e4 LT |
17 | */ |
18 | ||
19 | #include <linux/module.h> | |
20 | #include <linux/kernel.h> | |
21 | #include <linux/sched.h> | |
22 | #include <linux/slab.h> | |
23 | #include <linux/errno.h> | |
24 | #include <linux/interrupt.h> | |
25 | #include <linux/ioport.h> | |
26 | #include <linux/init.h> | |
00431707 | 27 | #include <linux/mutex.h> |
88286450 | 28 | #include <linux/clk.h> |
29 | #include <linux/err.h> | |
30 | #include <linux/platform_device.h> | |
8348c259 | 31 | #include <linux/spi/pxa2xx_spi.h> |
fced80c7 | 32 | #include <linux/io.h> |
a6e56c28 DM |
33 | #include <linux/of.h> |
34 | #include <linux/of_device.h> | |
88286450 | 35 | |
1da177e4 | 36 | #include <asm/irq.h> |
1da177e4 | 37 | |
88286450 | 38 | static DEFINE_MUTEX(ssp_lock); |
39 | static LIST_HEAD(ssp_list); | |
40 | ||
baffe169 | 41 | struct ssp_device *pxa_ssp_request(int port, const char *label) |
88286450 | 42 | { |
43 | struct ssp_device *ssp = NULL; | |
44 | ||
45 | mutex_lock(&ssp_lock); | |
1da177e4 | 46 | |
88286450 | 47 | list_for_each_entry(ssp, &ssp_list, node) { |
48 | if (ssp->port_id == port && ssp->use_count == 0) { | |
49 | ssp->use_count++; | |
50 | ssp->label = label; | |
51 | break; | |
52 | } | |
1da177e4 LT |
53 | } |
54 | ||
88286450 | 55 | mutex_unlock(&ssp_lock); |
56 | ||
a4aff223 | 57 | if (&ssp->node == &ssp_list) |
88286450 | 58 | return NULL; |
59 | ||
60 | return ssp; | |
61 | } | |
baffe169 | 62 | EXPORT_SYMBOL(pxa_ssp_request); |
88286450 | 63 | |
6446221c DM |
64 | struct ssp_device *pxa_ssp_request_of(const struct device_node *of_node, |
65 | const char *label) | |
66 | { | |
67 | struct ssp_device *ssp = NULL; | |
68 | ||
69 | mutex_lock(&ssp_lock); | |
70 | ||
71 | list_for_each_entry(ssp, &ssp_list, node) { | |
72 | if (ssp->of_node == of_node && ssp->use_count == 0) { | |
73 | ssp->use_count++; | |
74 | ssp->label = label; | |
75 | break; | |
76 | } | |
77 | } | |
78 | ||
79 | mutex_unlock(&ssp_lock); | |
80 | ||
81 | if (&ssp->node == &ssp_list) | |
82 | return NULL; | |
83 | ||
84 | return ssp; | |
85 | } | |
86 | EXPORT_SYMBOL(pxa_ssp_request_of); | |
87 | ||
baffe169 | 88 | void pxa_ssp_free(struct ssp_device *ssp) |
88286450 | 89 | { |
90 | mutex_lock(&ssp_lock); | |
91 | if (ssp->use_count) { | |
92 | ssp->use_count--; | |
93 | ssp->label = NULL; | |
94 | } else | |
95 | dev_err(&ssp->pdev->dev, "device already free\n"); | |
96 | mutex_unlock(&ssp_lock); | |
1da177e4 | 97 | } |
baffe169 | 98 | EXPORT_SYMBOL(pxa_ssp_free); |
88286450 | 99 | |
a6e56c28 DM |
100 | #ifdef CONFIG_OF |
101 | static const struct of_device_id pxa_ssp_of_ids[] = { | |
102 | { .compatible = "mrvl,pxa25x-ssp", .data = (void *) PXA25x_SSP }, | |
103 | { .compatible = "mvrl,pxa25x-nssp", .data = (void *) PXA25x_NSSP }, | |
104 | { .compatible = "mrvl,pxa27x-ssp", .data = (void *) PXA27x_SSP }, | |
105 | { .compatible = "mrvl,pxa3xx-ssp", .data = (void *) PXA3xx_SSP }, | |
106 | { .compatible = "mvrl,pxa168-ssp", .data = (void *) PXA168_SSP }, | |
107 | { .compatible = "mrvl,pxa910-ssp", .data = (void *) PXA910_SSP }, | |
108 | { .compatible = "mrvl,ce4100-ssp", .data = (void *) CE4100_SSP }, | |
a6e56c28 DM |
109 | { }, |
110 | }; | |
111 | MODULE_DEVICE_TABLE(of, pxa_ssp_of_ids); | |
112 | #endif | |
113 | ||
351a102d | 114 | static int pxa_ssp_probe(struct platform_device *pdev) |
88286450 | 115 | { |
116 | struct resource *res; | |
117 | struct ssp_device *ssp; | |
970d8a71 | 118 | struct device *dev = &pdev->dev; |
88286450 | 119 | |
1c459de1 | 120 | ssp = devm_kzalloc(dev, sizeof(struct ssp_device), GFP_KERNEL); |
64be2814 | 121 | if (ssp == NULL) |
88286450 | 122 | return -ENOMEM; |
64be2814 | 123 | |
919dcb21 | 124 | ssp->pdev = pdev; |
88286450 | 125 | |
1c459de1 DM |
126 | ssp->clk = devm_clk_get(dev, NULL); |
127 | if (IS_ERR(ssp->clk)) | |
128 | return PTR_ERR(ssp->clk); | |
88286450 | 129 | |
a6e56c28 DM |
130 | if (dev->of_node) { |
131 | struct of_phandle_args dma_spec; | |
132 | struct device_node *np = dev->of_node; | |
d5ece937 | 133 | int ret; |
a6e56c28 DM |
134 | |
135 | /* | |
136 | * FIXME: we should allocate the DMA channel from this | |
137 | * context and pass the channel down to the ssp users. | |
138 | * For now, we lookup the rx and tx indices manually | |
139 | */ | |
140 | ||
141 | /* rx */ | |
d5ece937 OJ |
142 | ret = of_parse_phandle_with_args(np, "dmas", "#dma-cells", |
143 | 0, &dma_spec); | |
144 | ||
145 | if (ret) { | |
146 | dev_err(dev, "Can't parse dmas property\n"); | |
147 | return -ENODEV; | |
148 | } | |
a6e56c28 DM |
149 | ssp->drcmr_rx = dma_spec.args[0]; |
150 | of_node_put(dma_spec.np); | |
151 | ||
152 | /* tx */ | |
d5ece937 OJ |
153 | ret = of_parse_phandle_with_args(np, "dmas", "#dma-cells", |
154 | 1, &dma_spec); | |
155 | if (ret) { | |
156 | dev_err(dev, "Can't parse dmas property\n"); | |
157 | return -ENODEV; | |
158 | } | |
a6e56c28 DM |
159 | ssp->drcmr_tx = dma_spec.args[0]; |
160 | of_node_put(dma_spec.np); | |
161 | } else { | |
162 | res = platform_get_resource(pdev, IORESOURCE_DMA, 0); | |
163 | if (res == NULL) { | |
164 | dev_err(dev, "no SSP RX DRCMR defined\n"); | |
165 | return -ENODEV; | |
166 | } | |
167 | ssp->drcmr_rx = res->start; | |
077de1ad | 168 | |
a6e56c28 DM |
169 | res = platform_get_resource(pdev, IORESOURCE_DMA, 1); |
170 | if (res == NULL) { | |
171 | dev_err(dev, "no SSP TX DRCMR defined\n"); | |
172 | return -ENODEV; | |
173 | } | |
174 | ssp->drcmr_tx = res->start; | |
077de1ad | 175 | } |
077de1ad | 176 | |
88286450 | 177 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
178 | if (res == NULL) { | |
970d8a71 | 179 | dev_err(dev, "no memory resource defined\n"); |
1c459de1 | 180 | return -ENODEV; |
88286450 | 181 | } |
182 | ||
1c459de1 DM |
183 | res = devm_request_mem_region(dev, res->start, resource_size(res), |
184 | pdev->name); | |
88286450 | 185 | if (res == NULL) { |
970d8a71 | 186 | dev_err(dev, "failed to request memory resource\n"); |
1c459de1 | 187 | return -EBUSY; |
88286450 | 188 | } |
189 | ||
190 | ssp->phys_base = res->start; | |
191 | ||
1c459de1 | 192 | ssp->mmio_base = devm_ioremap(dev, res->start, resource_size(res)); |
88286450 | 193 | if (ssp->mmio_base == NULL) { |
970d8a71 | 194 | dev_err(dev, "failed to ioremap() registers\n"); |
1c459de1 | 195 | return -ENODEV; |
88286450 | 196 | } |
197 | ||
198 | ssp->irq = platform_get_irq(pdev, 0); | |
199 | if (ssp->irq < 0) { | |
970d8a71 | 200 | dev_err(dev, "no IRQ resource defined\n"); |
1c459de1 | 201 | return -ENODEV; |
88286450 | 202 | } |
203 | ||
a6e56c28 DM |
204 | if (dev->of_node) { |
205 | const struct of_device_id *id = | |
206 | of_match_device(of_match_ptr(pxa_ssp_of_ids), dev); | |
207 | ssp->type = (int) id->data; | |
208 | } else { | |
209 | const struct platform_device_id *id = | |
210 | platform_get_device_id(pdev); | |
211 | ssp->type = (int) id->driver_data; | |
212 | ||
213 | /* PXA2xx/3xx SSP ports starts from 1 and the internal pdev->id | |
214 | * starts from 0, do a translation here | |
215 | */ | |
216 | ssp->port_id = pdev->id + 1; | |
217 | } | |
218 | ||
88286450 | 219 | ssp->use_count = 0; |
6446221c | 220 | ssp->of_node = dev->of_node; |
88286450 | 221 | |
222 | mutex_lock(&ssp_lock); | |
223 | list_add(&ssp->node, &ssp_list); | |
224 | mutex_unlock(&ssp_lock); | |
225 | ||
226 | platform_set_drvdata(pdev, ssp); | |
88286450 | 227 | |
1c459de1 | 228 | return 0; |
88286450 | 229 | } |
230 | ||
351a102d | 231 | static int pxa_ssp_remove(struct platform_device *pdev) |
88286450 | 232 | { |
233 | struct resource *res; | |
234 | struct ssp_device *ssp; | |
235 | ||
236 | ssp = platform_get_drvdata(pdev); | |
237 | if (ssp == NULL) | |
238 | return -ENODEV; | |
239 | ||
240 | iounmap(ssp->mmio_base); | |
241 | ||
242 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
c8ee5c69 | 243 | release_mem_region(res->start, resource_size(res)); |
88286450 | 244 | |
245 | clk_put(ssp->clk); | |
1da177e4 | 246 | |
88286450 | 247 | mutex_lock(&ssp_lock); |
248 | list_del(&ssp->node); | |
249 | mutex_unlock(&ssp_lock); | |
250 | ||
251 | kfree(ssp); | |
252 | return 0; | |
253 | } | |
254 | ||
6427d450 EM |
255 | static const struct platform_device_id ssp_id_table[] = { |
256 | { "pxa25x-ssp", PXA25x_SSP }, | |
257 | { "pxa25x-nssp", PXA25x_NSSP }, | |
258 | { "pxa27x-ssp", PXA27x_SSP }, | |
6f0243a1 | 259 | { "pxa3xx-ssp", PXA3xx_SSP }, |
7e499228 | 260 | { "pxa168-ssp", PXA168_SSP }, |
60172215 | 261 | { "pxa910-ssp", PXA910_SSP }, |
6427d450 | 262 | { }, |
88286450 | 263 | }; |
264 | ||
baffe169 HZ |
265 | static struct platform_driver pxa_ssp_driver = { |
266 | .probe = pxa_ssp_probe, | |
351a102d | 267 | .remove = pxa_ssp_remove, |
88286450 | 268 | .driver = { |
a6e56c28 DM |
269 | .name = "pxa2xx-ssp", |
270 | .of_match_table = of_match_ptr(pxa_ssp_of_ids), | |
88286450 | 271 | }, |
6427d450 | 272 | .id_table = ssp_id_table, |
88286450 | 273 | }; |
274 | ||
275 | static int __init pxa_ssp_init(void) | |
276 | { | |
baffe169 | 277 | return platform_driver_register(&pxa_ssp_driver); |
88286450 | 278 | } |
279 | ||
280 | static void __exit pxa_ssp_exit(void) | |
281 | { | |
baffe169 | 282 | platform_driver_unregister(&pxa_ssp_driver); |
1da177e4 LT |
283 | } |
284 | ||
cae05541 | 285 | arch_initcall(pxa_ssp_init); |
88286450 | 286 | module_exit(pxa_ssp_exit); |
1da177e4 | 287 | |
1da177e4 LT |
288 | MODULE_DESCRIPTION("PXA SSP driver"); |
289 | MODULE_AUTHOR("Liam Girdwood"); | |
290 | MODULE_LICENSE("GPL"); |