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>
16 #include <linux/errno.h>
17 #include <linux/kernel.h>
18 #include <linux/delay.h>
19 #include <linux/spinlock.h>
20 #include <linux/slab.h>
21 #include <linux/platform_device.h>
24 #include <asm/hardware.h>
25 #include <asm/mach-types.h>
26 #include <asm/system.h>
27 #include <asm/arch/mcp.h>
29 #include <asm/arch/assabet.h>
38 #define priv(mcp) ((struct mcp_sa11x0 *)mcp_priv(mcp))
41 mcp_sa11x0_set_telecom_divisor(struct mcp *mcp, unsigned int divisor)
47 mccr0 = Ser4MCCR0 & ~0x00007f00;
48 mccr0 |= divisor << 8;
53 mcp_sa11x0_set_audio_divisor(struct mcp *mcp, unsigned int divisor)
59 mccr0 = Ser4MCCR0 & ~0x0000007f;
65 * Write data to the device. The bit should be set after 3 subframe
66 * times (each frame is 64 clocks). We wait a maximum of 6 subframes.
67 * We really should try doing something more productive while we
71 mcp_sa11x0_write(struct mcp *mcp, unsigned int reg, unsigned int val)
76 Ser4MCDR2 = reg << 17 | MCDR2_Wr | (val & 0xffff);
78 for (i = 0; i < 2; i++) {
79 udelay(mcp->rw_timeout);
80 if (Ser4MCSR & MCSR_CWC) {
87 printk(KERN_WARNING "mcp: write timed out\n");
91 * Read data from the device. The bit should be set after 3 subframe
92 * times (each frame is 64 clocks). We wait a maximum of 6 subframes.
93 * We really should try doing something more productive while we
97 mcp_sa11x0_read(struct mcp *mcp, unsigned int reg)
102 Ser4MCDR2 = reg << 17 | MCDR2_Rd;
104 for (i = 0; i < 2; i++) {
105 udelay(mcp->rw_timeout);
106 if (Ser4MCSR & MCSR_CRC) {
107 ret = Ser4MCDR2 & 0xffff;
113 printk(KERN_WARNING "mcp: read timed out\n");
118 static void mcp_sa11x0_enable(struct mcp *mcp)
121 Ser4MCCR0 |= MCCR0_MCE;
124 static void mcp_sa11x0_disable(struct mcp *mcp)
126 Ser4MCCR0 &= ~MCCR0_MCE;
132 static struct mcp_ops mcp_sa11x0 = {
133 .set_telecom_divisor = mcp_sa11x0_set_telecom_divisor,
134 .set_audio_divisor = mcp_sa11x0_set_audio_divisor,
135 .reg_write = mcp_sa11x0_write,
136 .reg_read = mcp_sa11x0_read,
137 .enable = mcp_sa11x0_enable,
138 .disable = mcp_sa11x0_disable,
141 static int mcp_sa11x0_probe(struct device *dev)
143 struct platform_device *pdev = to_platform_device(dev);
144 struct mcp_plat_data *data = pdev->dev.platform_data;
151 if (!request_mem_region(0x80060000, 0x60, "sa11x0-mcp"))
154 mcp = mcp_host_alloc(&pdev->dev, sizeof(struct mcp_sa11x0));
160 mcp->owner = THIS_MODULE;
161 mcp->ops = &mcp_sa11x0;
162 mcp->sclk_rate = data->sclk_rate;
163 mcp->dma_audio_rd = DMA_Ser4MCP0Rd;
164 mcp->dma_audio_wr = DMA_Ser4MCP0Wr;
165 mcp->dma_telco_rd = DMA_Ser4MCP1Rd;
166 mcp->dma_telco_wr = DMA_Ser4MCP1Wr;
168 dev_set_drvdata(dev, mcp);
170 if (machine_is_assabet()) {
171 ASSABET_BCR_set(ASSABET_BCR_CODEC_RST);
175 * Setup the PPC unit correctly.
178 PPDR |= PPC_TXD4 | PPC_SCLK | PPC_SFRM;
180 PSDR &= ~(PPC_TXD4 | PPC_SCLK | PPC_SFRM);
181 PPSR &= ~(PPC_TXD4 | PPC_SCLK | PPC_SFRM);
184 * Initialise device. Note that we initially
185 * set the sampling rate to minimum.
188 Ser4MCCR1 = data->mccr1;
189 Ser4MCCR0 = data->mccr0 | 0x7f7f;
192 * Calculate the read/write timeout (us) from the bit clock
193 * rate. This is the period for 3 64-bit frames. Always
194 * round this time up.
196 mcp->rw_timeout = (64 * 3 * 1000000 + mcp->sclk_rate - 1) /
199 ret = mcp_host_register(mcp);
204 release_mem_region(0x80060000, 0x60);
205 dev_set_drvdata(dev, NULL);
211 static int mcp_sa11x0_remove(struct device *dev)
213 struct mcp *mcp = dev_get_drvdata(dev);
215 dev_set_drvdata(dev, NULL);
216 mcp_host_unregister(mcp);
217 release_mem_region(0x80060000, 0x60);
222 static int mcp_sa11x0_suspend(struct device *dev, pm_message_t state)
224 struct mcp *mcp = dev_get_drvdata(dev);
226 priv(mcp)->mccr0 = Ser4MCCR0;
227 priv(mcp)->mccr1 = Ser4MCCR1;
228 Ser4MCCR0 &= ~MCCR0_MCE;
233 static int mcp_sa11x0_resume(struct device *dev)
235 struct mcp *mcp = dev_get_drvdata(dev);
237 Ser4MCCR1 = priv(mcp)->mccr1;
238 Ser4MCCR0 = priv(mcp)->mccr0;
244 * The driver for the SA11x0 MCP port.
246 static struct device_driver mcp_sa11x0_driver = {
247 .name = "sa11x0-mcp",
248 .bus = &platform_bus_type,
249 .probe = mcp_sa11x0_probe,
250 .remove = mcp_sa11x0_remove,
251 .suspend = mcp_sa11x0_suspend,
252 .resume = mcp_sa11x0_resume,
256 * This needs re-working
258 static int __init mcp_sa11x0_init(void)
260 return driver_register(&mcp_sa11x0_driver);
263 static void __exit mcp_sa11x0_exit(void)
265 driver_unregister(&mcp_sa11x0_driver);
268 module_init(mcp_sa11x0_init);
269 module_exit(mcp_sa11x0_exit);
271 MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
272 MODULE_DESCRIPTION("SA11x0 multimedia communications port driver");
273 MODULE_LICENSE("GPL");