Commit | Line | Data |
---|---|---|
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> |
a09e64fb | 37 | #include <mach/hardware.h> |
1da177e4 | 38 | |
88286450 | 39 | static DEFINE_MUTEX(ssp_lock); |
40 | static LIST_HEAD(ssp_list); | |
41 | ||
baffe169 | 42 | struct ssp_device *pxa_ssp_request(int port, const char *label) |
88286450 | 43 | { |
44 | struct ssp_device *ssp = NULL; | |
45 | ||
46 | mutex_lock(&ssp_lock); | |
1da177e4 | 47 | |
88286450 | 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 | } | |
1da177e4 LT |
54 | } |
55 | ||
88286450 | 56 | mutex_unlock(&ssp_lock); |
57 | ||
a4aff223 | 58 | if (&ssp->node == &ssp_list) |
88286450 | 59 | return NULL; |
60 | ||
61 | return ssp; | |
62 | } | |
baffe169 | 63 | EXPORT_SYMBOL(pxa_ssp_request); |
88286450 | 64 | |
baffe169 | 65 | void pxa_ssp_free(struct ssp_device *ssp) |
88286450 | 66 | { |
67 | mutex_lock(&ssp_lock); | |
68 | if (ssp->use_count) { | |
69 | ssp->use_count--; | |
70 | ssp->label = NULL; | |
71 | } else | |
72 | dev_err(&ssp->pdev->dev, "device already free\n"); | |
73 | mutex_unlock(&ssp_lock); | |
1da177e4 | 74 | } |
baffe169 | 75 | EXPORT_SYMBOL(pxa_ssp_free); |
88286450 | 76 | |
a6e56c28 DM |
77 | #ifdef CONFIG_OF |
78 | static const struct of_device_id pxa_ssp_of_ids[] = { | |
79 | { .compatible = "mrvl,pxa25x-ssp", .data = (void *) PXA25x_SSP }, | |
80 | { .compatible = "mvrl,pxa25x-nssp", .data = (void *) PXA25x_NSSP }, | |
81 | { .compatible = "mrvl,pxa27x-ssp", .data = (void *) PXA27x_SSP }, | |
82 | { .compatible = "mrvl,pxa3xx-ssp", .data = (void *) PXA3xx_SSP }, | |
83 | { .compatible = "mvrl,pxa168-ssp", .data = (void *) PXA168_SSP }, | |
84 | { .compatible = "mrvl,pxa910-ssp", .data = (void *) PXA910_SSP }, | |
85 | { .compatible = "mrvl,ce4100-ssp", .data = (void *) CE4100_SSP }, | |
86 | { .compatible = "mrvl,lpss-ssp", .data = (void *) LPSS_SSP }, | |
87 | { }, | |
88 | }; | |
89 | MODULE_DEVICE_TABLE(of, pxa_ssp_of_ids); | |
90 | #endif | |
91 | ||
351a102d | 92 | static int pxa_ssp_probe(struct platform_device *pdev) |
88286450 | 93 | { |
94 | struct resource *res; | |
95 | struct ssp_device *ssp; | |
970d8a71 | 96 | struct device *dev = &pdev->dev; |
88286450 | 97 | |
1c459de1 | 98 | ssp = devm_kzalloc(dev, sizeof(struct ssp_device), GFP_KERNEL); |
64be2814 | 99 | if (ssp == NULL) |
88286450 | 100 | return -ENOMEM; |
64be2814 | 101 | |
919dcb21 | 102 | ssp->pdev = pdev; |
88286450 | 103 | |
1c459de1 DM |
104 | ssp->clk = devm_clk_get(dev, NULL); |
105 | if (IS_ERR(ssp->clk)) | |
106 | return PTR_ERR(ssp->clk); | |
88286450 | 107 | |
a6e56c28 DM |
108 | if (dev->of_node) { |
109 | struct of_phandle_args dma_spec; | |
110 | struct device_node *np = dev->of_node; | |
111 | ||
112 | /* | |
113 | * FIXME: we should allocate the DMA channel from this | |
114 | * context and pass the channel down to the ssp users. | |
115 | * For now, we lookup the rx and tx indices manually | |
116 | */ | |
117 | ||
118 | /* rx */ | |
119 | of_parse_phandle_with_args(np, "dmas", "#dma-cells", | |
120 | 0, &dma_spec); | |
121 | ssp->drcmr_rx = dma_spec.args[0]; | |
122 | of_node_put(dma_spec.np); | |
123 | ||
124 | /* tx */ | |
125 | of_parse_phandle_with_args(np, "dmas", "#dma-cells", | |
126 | 1, &dma_spec); | |
127 | ssp->drcmr_tx = dma_spec.args[0]; | |
128 | of_node_put(dma_spec.np); | |
129 | } else { | |
130 | res = platform_get_resource(pdev, IORESOURCE_DMA, 0); | |
131 | if (res == NULL) { | |
132 | dev_err(dev, "no SSP RX DRCMR defined\n"); | |
133 | return -ENODEV; | |
134 | } | |
135 | ssp->drcmr_rx = res->start; | |
077de1ad | 136 | |
a6e56c28 DM |
137 | res = platform_get_resource(pdev, IORESOURCE_DMA, 1); |
138 | if (res == NULL) { | |
139 | dev_err(dev, "no SSP TX DRCMR defined\n"); | |
140 | return -ENODEV; | |
141 | } | |
142 | ssp->drcmr_tx = res->start; | |
077de1ad | 143 | } |
077de1ad | 144 | |
88286450 | 145 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
146 | if (res == NULL) { | |
970d8a71 | 147 | dev_err(dev, "no memory resource defined\n"); |
1c459de1 | 148 | return -ENODEV; |
88286450 | 149 | } |
150 | ||
1c459de1 DM |
151 | res = devm_request_mem_region(dev, res->start, resource_size(res), |
152 | pdev->name); | |
88286450 | 153 | if (res == NULL) { |
970d8a71 | 154 | dev_err(dev, "failed to request memory resource\n"); |
1c459de1 | 155 | return -EBUSY; |
88286450 | 156 | } |
157 | ||
158 | ssp->phys_base = res->start; | |
159 | ||
1c459de1 | 160 | ssp->mmio_base = devm_ioremap(dev, res->start, resource_size(res)); |
88286450 | 161 | if (ssp->mmio_base == NULL) { |
970d8a71 | 162 | dev_err(dev, "failed to ioremap() registers\n"); |
1c459de1 | 163 | return -ENODEV; |
88286450 | 164 | } |
165 | ||
166 | ssp->irq = platform_get_irq(pdev, 0); | |
167 | if (ssp->irq < 0) { | |
970d8a71 | 168 | dev_err(dev, "no IRQ resource defined\n"); |
1c459de1 | 169 | return -ENODEV; |
88286450 | 170 | } |
171 | ||
a6e56c28 DM |
172 | if (dev->of_node) { |
173 | const struct of_device_id *id = | |
174 | of_match_device(of_match_ptr(pxa_ssp_of_ids), dev); | |
175 | ssp->type = (int) id->data; | |
176 | } else { | |
177 | const struct platform_device_id *id = | |
178 | platform_get_device_id(pdev); | |
179 | ssp->type = (int) id->driver_data; | |
180 | ||
181 | /* PXA2xx/3xx SSP ports starts from 1 and the internal pdev->id | |
182 | * starts from 0, do a translation here | |
183 | */ | |
184 | ssp->port_id = pdev->id + 1; | |
185 | } | |
186 | ||
88286450 | 187 | ssp->use_count = 0; |
88286450 | 188 | |
189 | mutex_lock(&ssp_lock); | |
190 | list_add(&ssp->node, &ssp_list); | |
191 | mutex_unlock(&ssp_lock); | |
192 | ||
193 | platform_set_drvdata(pdev, ssp); | |
88286450 | 194 | |
1c459de1 | 195 | return 0; |
88286450 | 196 | } |
197 | ||
351a102d | 198 | static int pxa_ssp_remove(struct platform_device *pdev) |
88286450 | 199 | { |
200 | struct resource *res; | |
201 | struct ssp_device *ssp; | |
202 | ||
203 | ssp = platform_get_drvdata(pdev); | |
204 | if (ssp == NULL) | |
205 | return -ENODEV; | |
206 | ||
207 | iounmap(ssp->mmio_base); | |
208 | ||
209 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
c8ee5c69 | 210 | release_mem_region(res->start, resource_size(res)); |
88286450 | 211 | |
212 | clk_put(ssp->clk); | |
1da177e4 | 213 | |
88286450 | 214 | mutex_lock(&ssp_lock); |
215 | list_del(&ssp->node); | |
216 | mutex_unlock(&ssp_lock); | |
217 | ||
218 | kfree(ssp); | |
219 | return 0; | |
220 | } | |
221 | ||
6427d450 EM |
222 | static const struct platform_device_id ssp_id_table[] = { |
223 | { "pxa25x-ssp", PXA25x_SSP }, | |
224 | { "pxa25x-nssp", PXA25x_NSSP }, | |
225 | { "pxa27x-ssp", PXA27x_SSP }, | |
7e499228 | 226 | { "pxa168-ssp", PXA168_SSP }, |
60172215 | 227 | { "pxa910-ssp", PXA910_SSP }, |
6427d450 | 228 | { }, |
88286450 | 229 | }; |
230 | ||
baffe169 HZ |
231 | static struct platform_driver pxa_ssp_driver = { |
232 | .probe = pxa_ssp_probe, | |
351a102d | 233 | .remove = pxa_ssp_remove, |
88286450 | 234 | .driver = { |
a6e56c28 DM |
235 | .owner = THIS_MODULE, |
236 | .name = "pxa2xx-ssp", | |
237 | .of_match_table = of_match_ptr(pxa_ssp_of_ids), | |
88286450 | 238 | }, |
6427d450 | 239 | .id_table = ssp_id_table, |
88286450 | 240 | }; |
241 | ||
242 | static int __init pxa_ssp_init(void) | |
243 | { | |
baffe169 | 244 | return platform_driver_register(&pxa_ssp_driver); |
88286450 | 245 | } |
246 | ||
247 | static void __exit pxa_ssp_exit(void) | |
248 | { | |
baffe169 | 249 | platform_driver_unregister(&pxa_ssp_driver); |
1da177e4 LT |
250 | } |
251 | ||
cae05541 | 252 | arch_initcall(pxa_ssp_init); |
88286450 | 253 | module_exit(pxa_ssp_exit); |
1da177e4 | 254 | |
1da177e4 LT |
255 | MODULE_DESCRIPTION("PXA SSP driver"); |
256 | MODULE_AUTHOR("Liam Girdwood"); | |
257 | MODULE_LICENSE("GPL"); |