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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>
27#include <linux/mutex.h>
28#include <linux/clk.h>
29#include <linux/err.h>
30#include <linux/platform_device.h>
31#include <linux/spi/pxa2xx_spi.h>
32#include <linux/io.h>
33#include <linux/of.h>
34#include <linux/of_device.h>
35
36#include <asm/irq.h>
37#include <mach/hardware.h>
38
39static DEFINE_MUTEX(ssp_lock);
40static LIST_HEAD(ssp_list);
41
42struct ssp_device *pxa_ssp_request(int port, const char *label)
43{
44 struct ssp_device *ssp = NULL;
45
46 mutex_lock(&ssp_lock);
47
48 list_for_each_entry(ssp, &ssp_list, node) {
49 if (ssp->port_id == port && ssp->use_count == 0) {
50 ssp->use_count++;
51 ssp->label = label;
52 break;
53 }
54 }
55
56 mutex_unlock(&ssp_lock);
57
58 if (&ssp->node == &ssp_list)
59 return NULL;
60
61 return ssp;
62}
63EXPORT_SYMBOL(pxa_ssp_request);
64
65struct ssp_device *pxa_ssp_request_of(const struct device_node *of_node,
66 const char *label)
67{
68 struct ssp_device *ssp = NULL;
69
70 mutex_lock(&ssp_lock);
71
72 list_for_each_entry(ssp, &ssp_list, node) {
73 if (ssp->of_node == of_node && ssp->use_count == 0) {
74 ssp->use_count++;
75 ssp->label = label;
76 break;
77 }
78 }
79
80 mutex_unlock(&ssp_lock);
81
82 if (&ssp->node == &ssp_list)
83 return NULL;
84
85 return ssp;
86}
87EXPORT_SYMBOL(pxa_ssp_request_of);
88
89void pxa_ssp_free(struct ssp_device *ssp)
90{
91 mutex_lock(&ssp_lock);
92 if (ssp->use_count) {
93 ssp->use_count--;
94 ssp->label = NULL;
95 } else
96 dev_err(&ssp->pdev->dev, "device already free\n");
97 mutex_unlock(&ssp_lock);
98}
99EXPORT_SYMBOL(pxa_ssp_free);
100
101#ifdef CONFIG_OF
102static const struct of_device_id pxa_ssp_of_ids[] = {
103 { .compatible = "mrvl,pxa25x-ssp", .data = (void *) PXA25x_SSP },
104 { .compatible = "mvrl,pxa25x-nssp", .data = (void *) PXA25x_NSSP },
105 { .compatible = "mrvl,pxa27x-ssp", .data = (void *) PXA27x_SSP },
106 { .compatible = "mrvl,pxa3xx-ssp", .data = (void *) PXA3xx_SSP },
107 { .compatible = "mvrl,pxa168-ssp", .data = (void *) PXA168_SSP },
108 { .compatible = "mrvl,pxa910-ssp", .data = (void *) PXA910_SSP },
109 { .compatible = "mrvl,ce4100-ssp", .data = (void *) CE4100_SSP },
110 { .compatible = "mrvl,lpss-ssp", .data = (void *) LPSS_SSP },
111 { },
112};
113MODULE_DEVICE_TABLE(of, pxa_ssp_of_ids);
114#endif
115
116static int pxa_ssp_probe(struct platform_device *pdev)
117{
118 struct resource *res;
119 struct ssp_device *ssp;
120 struct device *dev = &pdev->dev;
121
122 ssp = devm_kzalloc(dev, sizeof(struct ssp_device), GFP_KERNEL);
123 if (ssp == NULL)
124 return -ENOMEM;
125
126 ssp->pdev = pdev;
127
128 ssp->clk = devm_clk_get(dev, NULL);
129 if (IS_ERR(ssp->clk))
130 return PTR_ERR(ssp->clk);
131
132 if (dev->of_node) {
133 struct of_phandle_args dma_spec;
134 struct device_node *np = dev->of_node;
135 int ret;
136
137
138
139
140
141
142
143
144 ret = of_parse_phandle_with_args(np, "dmas", "#dma-cells",
145 0, &dma_spec);
146
147 if (ret) {
148 dev_err(dev, "Can't parse dmas property\n");
149 return -ENODEV;
150 }
151 ssp->drcmr_rx = dma_spec.args[0];
152 of_node_put(dma_spec.np);
153
154
155 ret = of_parse_phandle_with_args(np, "dmas", "#dma-cells",
156 1, &dma_spec);
157 if (ret) {
158 dev_err(dev, "Can't parse dmas property\n");
159 return -ENODEV;
160 }
161 ssp->drcmr_tx = dma_spec.args[0];
162 of_node_put(dma_spec.np);
163 } else {
164 res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
165 if (res == NULL) {
166 dev_err(dev, "no SSP RX DRCMR defined\n");
167 return -ENODEV;
168 }
169 ssp->drcmr_rx = res->start;
170
171 res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
172 if (res == NULL) {
173 dev_err(dev, "no SSP TX DRCMR defined\n");
174 return -ENODEV;
175 }
176 ssp->drcmr_tx = res->start;
177 }
178
179 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
180 if (res == NULL) {
181 dev_err(dev, "no memory resource defined\n");
182 return -ENODEV;
183 }
184
185 res = devm_request_mem_region(dev, res->start, resource_size(res),
186 pdev->name);
187 if (res == NULL) {
188 dev_err(dev, "failed to request memory resource\n");
189 return -EBUSY;
190 }
191
192 ssp->phys_base = res->start;
193
194 ssp->mmio_base = devm_ioremap(dev, res->start, resource_size(res));
195 if (ssp->mmio_base == NULL) {
196 dev_err(dev, "failed to ioremap() registers\n");
197 return -ENODEV;
198 }
199
200 ssp->irq = platform_get_irq(pdev, 0);
201 if (ssp->irq < 0) {
202 dev_err(dev, "no IRQ resource defined\n");
203 return -ENODEV;
204 }
205
206 if (dev->of_node) {
207 const struct of_device_id *id =
208 of_match_device(of_match_ptr(pxa_ssp_of_ids), dev);
209 ssp->type = (int) id->data;
210 } else {
211 const struct platform_device_id *id =
212 platform_get_device_id(pdev);
213 ssp->type = (int) id->driver_data;
214
215
216
217
218 ssp->port_id = pdev->id + 1;
219 }
220
221 ssp->use_count = 0;
222 ssp->of_node = dev->of_node;
223
224 mutex_lock(&ssp_lock);
225 list_add(&ssp->node, &ssp_list);
226 mutex_unlock(&ssp_lock);
227
228 platform_set_drvdata(pdev, ssp);
229
230 return 0;
231}
232
233static int pxa_ssp_remove(struct platform_device *pdev)
234{
235 struct resource *res;
236 struct ssp_device *ssp;
237
238 ssp = platform_get_drvdata(pdev);
239 if (ssp == NULL)
240 return -ENODEV;
241
242 iounmap(ssp->mmio_base);
243
244 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
245 release_mem_region(res->start, resource_size(res));
246
247 clk_put(ssp->clk);
248
249 mutex_lock(&ssp_lock);
250 list_del(&ssp->node);
251 mutex_unlock(&ssp_lock);
252
253 kfree(ssp);
254 return 0;
255}
256
257static const struct platform_device_id ssp_id_table[] = {
258 { "pxa25x-ssp", PXA25x_SSP },
259 { "pxa25x-nssp", PXA25x_NSSP },
260 { "pxa27x-ssp", PXA27x_SSP },
261 { "pxa168-ssp", PXA168_SSP },
262 { "pxa910-ssp", PXA910_SSP },
263 { },
264};
265
266static struct platform_driver pxa_ssp_driver = {
267 .probe = pxa_ssp_probe,
268 .remove = pxa_ssp_remove,
269 .driver = {
270 .owner = THIS_MODULE,
271 .name = "pxa2xx-ssp",
272 .of_match_table = of_match_ptr(pxa_ssp_of_ids),
273 },
274 .id_table = ssp_id_table,
275};
276
277static int __init pxa_ssp_init(void)
278{
279 return platform_driver_register(&pxa_ssp_driver);
280}
281
282static void __exit pxa_ssp_exit(void)
283{
284 platform_driver_unregister(&pxa_ssp_driver);
285}
286
287arch_initcall(pxa_ssp_init);
288module_exit(pxa_ssp_exit);
289
290MODULE_DESCRIPTION("PXA SSP driver");
291MODULE_AUTHOR("Liam Girdwood");
292MODULE_LICENSE("GPL");
293
