1 /*
2 * linux/drivers/mfd/mcp-sa11x0.c
3 *
4 * Copyright (C) 2001-2005 Russell King
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License.
9 *
10 * SA11x0 MCP (Multimedia Communications Port) driver.
11 *
12 * MCP read/write timeouts from Jordi Colomer, rehacked by rmk.
13 */
14 #include <linux/module.h>
15 #include <linux/init.h>
16 #include <linux/io.h>
17 #include <linux/errno.h>
18 #include <linux/kernel.h>
19 #include <linux/delay.h>
20 #include <linux/spinlock.h>
21 #include <linux/platform_device.h>
22 #include <linux/pm.h>
23 #include <linux/mfd/mcp.h>
24
25 #include <mach/hardware.h>
26 #include <asm/mach-types.h>
27 #include <mach/mcp.h>
28
29 #define DRIVER_NAME "sa11x0-mcp"
30
31 struct mcp_sa11x0 {
32 void __iomem *base0;
33 void __iomem *base1;
34 u32 mccr0;
35 u32 mccr1;
36 };
37
38 /* Register offsets */
39 #define MCCR0(m) ((m)->base0 + 0x00)
40 #define MCDR0(m) ((m)->base0 + 0x08)
41 #define MCDR1(m) ((m)->base0 + 0x0c)
42 #define MCDR2(m) ((m)->base0 + 0x10)
43 #define MCSR(m) ((m)->base0 + 0x18)
44 #define MCCR1(m) ((m)->base1 + 0x00)
45
46 #define priv(mcp) ((struct mcp_sa11x0 *)mcp_priv(mcp))
47
48 static void
mcp_sa11x0_set_telecom_divisor(struct mcp * mcp,unsigned int divisor)49 mcp_sa11x0_set_telecom_divisor(struct mcp *mcp, unsigned int divisor)
50 {
51 struct mcp_sa11x0 *m = priv(mcp);
52
53 divisor /= 32;
54
55 m->mccr0 &= ~0x00007f00;
56 m->mccr0 |= divisor << 8;
57 writel_relaxed(m->mccr0, MCCR0(m));
58 }
59
60 static void
mcp_sa11x0_set_audio_divisor(struct mcp * mcp,unsigned int divisor)61 mcp_sa11x0_set_audio_divisor(struct mcp *mcp, unsigned int divisor)
62 {
63 struct mcp_sa11x0 *m = priv(mcp);
64
65 divisor /= 32;
66
67 m->mccr0 &= ~0x0000007f;
68 m->mccr0 |= divisor;
69 writel_relaxed(m->mccr0, MCCR0(m));
70 }
71
72 /*
73 * Write data to the device. The bit should be set after 3 subframe
74 * times (each frame is 64 clocks). We wait a maximum of 6 subframes.
75 * We really should try doing something more productive while we
76 * wait.
77 */
78 static void
mcp_sa11x0_write(struct mcp * mcp,unsigned int reg,unsigned int val)79 mcp_sa11x0_write(struct mcp *mcp, unsigned int reg, unsigned int val)
80 {
81 struct mcp_sa11x0 *m = priv(mcp);
82 int ret = -ETIME;
83 int i;
84
85 writel_relaxed(reg << 17 | MCDR2_Wr | (val & 0xffff), MCDR2(m));
86
87 for (i = 0; i < 2; i++) {
88 udelay(mcp->rw_timeout);
89 if (readl_relaxed(MCSR(m)) & MCSR_CWC) {
90 ret = 0;
91 break;
92 }
93 }
94
95 if (ret < 0)
96 printk(KERN_WARNING "mcp: write timed out\n");
97 }
98
99 /*
100 * Read data from the device. The bit should be set after 3 subframe
101 * times (each frame is 64 clocks). We wait a maximum of 6 subframes.
102 * We really should try doing something more productive while we
103 * wait.
104 */
105 static unsigned int
mcp_sa11x0_read(struct mcp * mcp,unsigned int reg)106 mcp_sa11x0_read(struct mcp *mcp, unsigned int reg)
107 {
108 struct mcp_sa11x0 *m = priv(mcp);
109 int ret = -ETIME;
110 int i;
111
112 writel_relaxed(reg << 17 | MCDR2_Rd, MCDR2(m));
113
114 for (i = 0; i < 2; i++) {
115 udelay(mcp->rw_timeout);
116 if (readl_relaxed(MCSR(m)) & MCSR_CRC) {
117 ret = readl_relaxed(MCDR2(m)) & 0xffff;
118 break;
119 }
120 }
121
122 if (ret < 0)
123 printk(KERN_WARNING "mcp: read timed out\n");
124
125 return ret;
126 }
127
mcp_sa11x0_enable(struct mcp * mcp)128 static void mcp_sa11x0_enable(struct mcp *mcp)
129 {
130 struct mcp_sa11x0 *m = priv(mcp);
131
132 writel(-1, MCSR(m));
133 m->mccr0 |= MCCR0_MCE;
134 writel_relaxed(m->mccr0, MCCR0(m));
135 }
136
mcp_sa11x0_disable(struct mcp * mcp)137 static void mcp_sa11x0_disable(struct mcp *mcp)
138 {
139 struct mcp_sa11x0 *m = priv(mcp);
140
141 m->mccr0 &= ~MCCR0_MCE;
142 writel_relaxed(m->mccr0, MCCR0(m));
143 }
144
145 /*
146 * Our methods.
147 */
148 static struct mcp_ops mcp_sa11x0 = {
149 .set_telecom_divisor = mcp_sa11x0_set_telecom_divisor,
150 .set_audio_divisor = mcp_sa11x0_set_audio_divisor,
151 .reg_write = mcp_sa11x0_write,
152 .reg_read = mcp_sa11x0_read,
153 .enable = mcp_sa11x0_enable,
154 .disable = mcp_sa11x0_disable,
155 };
156
mcp_sa11x0_probe(struct platform_device * dev)157 static int mcp_sa11x0_probe(struct platform_device *dev)
158 {
159 struct mcp_plat_data *data = dev->dev.platform_data;
160 struct resource *mem0, *mem1;
161 struct mcp_sa11x0 *m;
162 struct mcp *mcp;
163 int ret;
164
165 if (!data)
166 return -ENODEV;
167
168 mem0 = platform_get_resource(dev, IORESOURCE_MEM, 0);
169 mem1 = platform_get_resource(dev, IORESOURCE_MEM, 1);
170 if (!mem0 || !mem1)
171 return -ENXIO;
172
173 if (!request_mem_region(mem0->start, resource_size(mem0),
174 DRIVER_NAME)) {
175 ret = -EBUSY;
176 goto err_mem0;
177 }
178
179 if (!request_mem_region(mem1->start, resource_size(mem1),
180 DRIVER_NAME)) {
181 ret = -EBUSY;
182 goto err_mem1;
183 }
184
185 mcp = mcp_host_alloc(&dev->dev, sizeof(struct mcp_sa11x0));
186 if (!mcp) {
187 ret = -ENOMEM;
188 goto err_alloc;
189 }
190
191 mcp->owner = THIS_MODULE;
192 mcp->ops = &mcp_sa11x0;
193 mcp->sclk_rate = data->sclk_rate;
194
195 m = priv(mcp);
196 m->mccr0 = data->mccr0 | 0x7f7f;
197 m->mccr1 = data->mccr1;
198
199 m->base0 = ioremap(mem0->start, resource_size(mem0));
200 m->base1 = ioremap(mem1->start, resource_size(mem1));
201 if (!m->base0 || !m->base1) {
202 ret = -ENOMEM;
203 goto err_ioremap;
204 }
205
206 platform_set_drvdata(dev, mcp);
207
208 /*
209 * Initialise device. Note that we initially
210 * set the sampling rate to minimum.
211 */
212 writel_relaxed(-1, MCSR(m));
213 writel_relaxed(m->mccr1, MCCR1(m));
214 writel_relaxed(m->mccr0, MCCR0(m));
215
216 /*
217 * Calculate the read/write timeout (us) from the bit clock
218 * rate. This is the period for 3 64-bit frames. Always
219 * round this time up.
220 */
221 mcp->rw_timeout = (64 * 3 * 1000000 + mcp->sclk_rate - 1) /
222 mcp->sclk_rate;
223
224 ret = mcp_host_add(mcp, data->codec_pdata);
225 if (ret == 0)
226 return 0;
227
228 platform_set_drvdata(dev, NULL);
229
230 err_ioremap:
231 iounmap(m->base1);
232 iounmap(m->base0);
233 mcp_host_free(mcp);
234 err_alloc:
235 release_mem_region(mem1->start, resource_size(mem1));
236 err_mem1:
237 release_mem_region(mem0->start, resource_size(mem0));
238 err_mem0:
239 return ret;
240 }
241
mcp_sa11x0_remove(struct platform_device * dev)242 static int mcp_sa11x0_remove(struct platform_device *dev)
243 {
244 struct mcp *mcp = platform_get_drvdata(dev);
245 struct mcp_sa11x0 *m = priv(mcp);
246 struct resource *mem0, *mem1;
247
248 if (m->mccr0 & MCCR0_MCE)
249 dev_warn(&dev->dev,
250 "device left active (missing disable call?)\n");
251
252 mem0 = platform_get_resource(dev, IORESOURCE_MEM, 0);
253 mem1 = platform_get_resource(dev, IORESOURCE_MEM, 1);
254
255 platform_set_drvdata(dev, NULL);
256 mcp_host_del(mcp);
257 iounmap(m->base1);
258 iounmap(m->base0);
259 mcp_host_free(mcp);
260 release_mem_region(mem1->start, resource_size(mem1));
261 release_mem_region(mem0->start, resource_size(mem0));
262
263 return 0;
264 }
265
266 #ifdef CONFIG_PM_SLEEP
mcp_sa11x0_suspend(struct device * dev)267 static int mcp_sa11x0_suspend(struct device *dev)
268 {
269 struct mcp_sa11x0 *m = priv(dev_get_drvdata(dev));
270
271 if (m->mccr0 & MCCR0_MCE)
272 dev_warn(dev, "device left active (missing disable call?)\n");
273
274 writel(m->mccr0 & ~MCCR0_MCE, MCCR0(m));
275
276 return 0;
277 }
278
mcp_sa11x0_resume(struct device * dev)279 static int mcp_sa11x0_resume(struct device *dev)
280 {
281 struct mcp_sa11x0 *m = priv(dev_get_drvdata(dev));
282
283 writel_relaxed(m->mccr1, MCCR1(m));
284 writel_relaxed(m->mccr0, MCCR0(m));
285
286 return 0;
287 }
288 #endif
289
290 static const struct dev_pm_ops mcp_sa11x0_pm_ops = {
291 #ifdef CONFIG_PM_SLEEP
292 .suspend = mcp_sa11x0_suspend,
293 .freeze = mcp_sa11x0_suspend,
294 .poweroff = mcp_sa11x0_suspend,
295 .resume_noirq = mcp_sa11x0_resume,
296 .thaw_noirq = mcp_sa11x0_resume,
297 .restore_noirq = mcp_sa11x0_resume,
298 #endif
299 };
300
301 static struct platform_driver mcp_sa11x0_driver = {
302 .probe = mcp_sa11x0_probe,
303 .remove = mcp_sa11x0_remove,
304 .driver = {
305 .name = DRIVER_NAME,
306 .owner = THIS_MODULE,
307 .pm = &mcp_sa11x0_pm_ops,
308 },
309 };
310
311 /*
312 * This needs re-working
313 */
314 module_platform_driver(mcp_sa11x0_driver);
315
316 MODULE_ALIAS("platform:" DRIVER_NAME);
317 MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
318 MODULE_DESCRIPTION("SA11x0 multimedia communications port driver");
319 MODULE_LICENSE("GPL");
320