2 * linux/drivers/mfd/mcp-sa11x0.c
4 * Copyright (C) 2001-2005 Russell King
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.
10 * SA11x0 MCP (Multimedia Communications Port) driver.
12 * MCP read/write timeouts from Jordi Colomer, rehacked by rmk.
14 #include <linux/module.h>
15 #include <linux/init.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>
23 #include <linux/mfd/mcp.h>
25 #include <mach/hardware.h>
26 #include <asm/mach-types.h>
27 #include <asm/system.h>
30 #define DRIVER_NAME "sa11x0-mcp"
39 /* Register offsets */
40 #define MCCR0(m) ((m)->base0 + 0x00)
41 #define MCDR0(m) ((m)->base0 + 0x08)
42 #define MCDR1(m) ((m)->base0 + 0x0c)
43 #define MCDR2(m) ((m)->base0 + 0x10)
44 #define MCSR(m) ((m)->base0 + 0x18)
45 #define MCCR1(m) ((m)->base1 + 0x00)
47 #define priv(mcp) ((struct mcp_sa11x0 *)mcp_priv(mcp))
50 mcp_sa11x0_set_telecom_divisor(struct mcp *mcp, unsigned int divisor)
52 struct mcp_sa11x0 *m = priv(mcp);
56 m->mccr0 &= ~0x00007f00;
57 m->mccr0 |= divisor << 8;
58 writel_relaxed(m->mccr0, MCCR0(m));
62 mcp_sa11x0_set_audio_divisor(struct mcp *mcp, unsigned int divisor)
64 struct mcp_sa11x0 *m = priv(mcp);
68 m->mccr0 &= ~0x0000007f;
70 writel_relaxed(m->mccr0, MCCR0(m));
74 * Write data to the device. The bit should be set after 3 subframe
75 * times (each frame is 64 clocks). We wait a maximum of 6 subframes.
76 * We really should try doing something more productive while we
80 mcp_sa11x0_write(struct mcp *mcp, unsigned int reg, unsigned int val)
82 struct mcp_sa11x0 *m = priv(mcp);
86 writel_relaxed(reg << 17 | MCDR2_Wr | (val & 0xffff), MCDR2(m));
88 for (i = 0; i < 2; i++) {
89 udelay(mcp->rw_timeout);
90 if (readl_relaxed(MCSR(m)) & MCSR_CWC) {
97 printk(KERN_WARNING "mcp: write timed out\n");
101 * Read data from the device. The bit should be set after 3 subframe
102 * times (each frame is 64 clocks). We wait a maximum of 6 subframes.
103 * We really should try doing something more productive while we
107 mcp_sa11x0_read(struct mcp *mcp, unsigned int reg)
109 struct mcp_sa11x0 *m = priv(mcp);
113 writel_relaxed(reg << 17 | MCDR2_Rd, MCDR2(m));
115 for (i = 0; i < 2; i++) {
116 udelay(mcp->rw_timeout);
117 if (readl_relaxed(MCSR(m)) & MCSR_CRC) {
118 ret = readl_relaxed(MCDR2(m)) & 0xffff;
124 printk(KERN_WARNING "mcp: read timed out\n");
129 static void mcp_sa11x0_enable(struct mcp *mcp)
131 struct mcp_sa11x0 *m = priv(mcp);
134 m->mccr0 |= MCCR0_MCE;
135 writel_relaxed(m->mccr0, MCCR0(m));
138 static void mcp_sa11x0_disable(struct mcp *mcp)
140 struct mcp_sa11x0 *m = priv(mcp);
142 m->mccr0 &= ~MCCR0_MCE;
143 writel_relaxed(m->mccr0, MCCR0(m));
149 static struct mcp_ops mcp_sa11x0 = {
150 .set_telecom_divisor = mcp_sa11x0_set_telecom_divisor,
151 .set_audio_divisor = mcp_sa11x0_set_audio_divisor,
152 .reg_write = mcp_sa11x0_write,
153 .reg_read = mcp_sa11x0_read,
154 .enable = mcp_sa11x0_enable,
155 .disable = mcp_sa11x0_disable,
158 static int mcp_sa11x0_probe(struct platform_device *dev)
160 struct mcp_plat_data *data = dev->dev.platform_data;
161 struct resource *mem0, *mem1;
162 struct mcp_sa11x0 *m;
169 mem0 = platform_get_resource(dev, IORESOURCE_MEM, 0);
170 mem1 = platform_get_resource(dev, IORESOURCE_MEM, 1);
174 if (!request_mem_region(mem0->start, resource_size(mem0),
180 if (!request_mem_region(mem1->start, resource_size(mem1),
186 mcp = mcp_host_alloc(&dev->dev, sizeof(struct mcp_sa11x0));
192 mcp->owner = THIS_MODULE;
193 mcp->ops = &mcp_sa11x0;
194 mcp->sclk_rate = data->sclk_rate;
197 m->mccr0 = data->mccr0 | 0x7f7f;
198 m->mccr1 = data->mccr1;
200 m->base0 = ioremap(mem0->start, resource_size(mem0));
201 m->base1 = ioremap(mem1->start, resource_size(mem1));
202 if (!m->base0 || !m->base1) {
207 platform_set_drvdata(dev, mcp);
210 * Initialise device. Note that we initially
211 * set the sampling rate to minimum.
213 writel_relaxed(-1, MCSR(m));
214 writel_relaxed(m->mccr1, MCCR1(m));
215 writel_relaxed(m->mccr0, MCCR0(m));
218 * Calculate the read/write timeout (us) from the bit clock
219 * rate. This is the period for 3 64-bit frames. Always
220 * round this time up.
222 mcp->rw_timeout = (64 * 3 * 1000000 + mcp->sclk_rate - 1) /
225 ret = mcp_host_add(mcp, data->codec_pdata);
229 platform_set_drvdata(dev, NULL);
236 release_mem_region(mem1->start, resource_size(mem1));
238 release_mem_region(mem0->start, resource_size(mem0));
243 static int mcp_sa11x0_remove(struct platform_device *dev)
245 struct mcp *mcp = platform_get_drvdata(dev);
246 struct mcp_sa11x0 *m = priv(mcp);
247 struct resource *mem0, *mem1;
249 if (m->mccr0 & MCCR0_MCE)
251 "device left active (missing disable call?)\n");
253 mem0 = platform_get_resource(dev, IORESOURCE_MEM, 0);
254 mem1 = platform_get_resource(dev, IORESOURCE_MEM, 1);
256 platform_set_drvdata(dev, NULL);
261 release_mem_region(mem1->start, resource_size(mem1));
262 release_mem_region(mem0->start, resource_size(mem0));
267 #ifdef CONFIG_PM_SLEEP
268 static int mcp_sa11x0_suspend(struct device *dev)
270 struct mcp_sa11x0 *m = priv(dev_get_drvdata(dev));
272 if (m->mccr0 & MCCR0_MCE)
273 dev_warn(dev, "device left active (missing disable call?)\n");
275 writel(m->mccr0 & ~MCCR0_MCE, MCCR0(m));
280 static int mcp_sa11x0_resume(struct device *dev)
282 struct mcp_sa11x0 *m = priv(dev_get_drvdata(dev));
284 writel_relaxed(m->mccr1, MCCR1(m));
285 writel_relaxed(m->mccr0, MCCR0(m));
291 static const struct dev_pm_ops mcp_sa11x0_pm_ops = {
292 #ifdef CONFIG_PM_SLEEP
293 .suspend = mcp_sa11x0_suspend,
294 .freeze = mcp_sa11x0_suspend,
295 .poweroff = mcp_sa11x0_suspend,
296 .resume_noirq = mcp_sa11x0_resume,
297 .thaw_noirq = mcp_sa11x0_resume,
298 .restore_noirq = mcp_sa11x0_resume,
302 static struct platform_driver mcp_sa11x0_driver = {
303 .probe = mcp_sa11x0_probe,
304 .remove = mcp_sa11x0_remove,
307 .owner = THIS_MODULE,
308 .pm = &mcp_sa11x0_pm_ops,
313 * This needs re-working
315 module_platform_driver(mcp_sa11x0_driver);
317 MODULE_ALIAS("platform:" DRIVER_NAME);
318 MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
319 MODULE_DESCRIPTION("SA11x0 multimedia communications port driver");
320 MODULE_LICENSE("GPL");