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/platform_device.h>
21 #include <linux/mfd/mcp.h>
24 #include <mach/hardware.h>
25 #include <asm/mach-types.h>
26 #include <asm/system.h>
29 #include <mach/assabet.h>
37 #define priv(mcp) ((struct mcp_sa11x0 *)mcp_priv(mcp))
40 mcp_sa11x0_set_telecom_divisor(struct mcp *mcp, unsigned int divisor)
46 mccr0 = Ser4MCCR0 & ~0x00007f00;
47 mccr0 |= divisor << 8;
52 mcp_sa11x0_set_audio_divisor(struct mcp *mcp, unsigned int divisor)
58 mccr0 = Ser4MCCR0 & ~0x0000007f;
64 * Write data to the device. The bit should be set after 3 subframe
65 * times (each frame is 64 clocks). We wait a maximum of 6 subframes.
66 * We really should try doing something more productive while we
70 mcp_sa11x0_write(struct mcp *mcp, unsigned int reg, unsigned int val)
75 Ser4MCDR2 = reg << 17 | MCDR2_Wr | (val & 0xffff);
77 for (i = 0; i < 2; i++) {
78 udelay(mcp->rw_timeout);
79 if (Ser4MCSR & MCSR_CWC) {
86 printk(KERN_WARNING "mcp: write timed out\n");
90 * Read data from the device. The bit should be set after 3 subframe
91 * times (each frame is 64 clocks). We wait a maximum of 6 subframes.
92 * We really should try doing something more productive while we
96 mcp_sa11x0_read(struct mcp *mcp, unsigned int reg)
101 Ser4MCDR2 = reg << 17 | MCDR2_Rd;
103 for (i = 0; i < 2; i++) {
104 udelay(mcp->rw_timeout);
105 if (Ser4MCSR & MCSR_CRC) {
106 ret = Ser4MCDR2 & 0xffff;
112 printk(KERN_WARNING "mcp: read timed out\n");
117 static void mcp_sa11x0_enable(struct mcp *mcp)
120 Ser4MCCR0 |= MCCR0_MCE;
123 static void mcp_sa11x0_disable(struct mcp *mcp)
125 Ser4MCCR0 &= ~MCCR0_MCE;
131 static struct mcp_ops mcp_sa11x0 = {
132 .set_telecom_divisor = mcp_sa11x0_set_telecom_divisor,
133 .set_audio_divisor = mcp_sa11x0_set_audio_divisor,
134 .reg_write = mcp_sa11x0_write,
135 .reg_read = mcp_sa11x0_read,
136 .enable = mcp_sa11x0_enable,
137 .disable = mcp_sa11x0_disable,
140 static int mcp_sa11x0_probe(struct platform_device *pdev)
142 struct mcp_plat_data *data = pdev->dev.platform_data;
152 if (!request_mem_region(0x80060000, 0x60, "sa11x0-mcp"))
155 mcp = mcp_host_alloc(&pdev->dev, sizeof(struct mcp_sa11x0));
161 mcp->owner = THIS_MODULE;
162 mcp->ops = &mcp_sa11x0;
163 mcp->sclk_rate = data->sclk_rate;
164 mcp->dma_audio_rd = DMA_Ser4MCP0Rd;
165 mcp->dma_audio_wr = DMA_Ser4MCP0Wr;
166 mcp->dma_telco_rd = DMA_Ser4MCP1Rd;
167 mcp->dma_telco_wr = DMA_Ser4MCP1Wr;
168 mcp->codec = data->codec;
170 platform_set_drvdata(pdev, mcp);
172 if (machine_is_assabet()) {
173 ASSABET_BCR_set(ASSABET_BCR_CODEC_RST);
177 * Setup the PPC unit correctly.
180 PPDR |= PPC_TXD4 | PPC_SCLK | PPC_SFRM;
182 PSDR &= ~(PPC_TXD4 | PPC_SCLK | PPC_SFRM);
183 PPSR &= ~(PPC_TXD4 | PPC_SCLK | PPC_SFRM);
186 * Initialise device. Note that we initially
187 * set the sampling rate to minimum.
190 Ser4MCCR1 = data->mccr1;
191 Ser4MCCR0 = data->mccr0 | 0x7f7f;
194 * Calculate the read/write timeout (us) from the bit clock
195 * rate. This is the period for 3 64-bit frames. Always
196 * round this time up.
198 mcp->rw_timeout = (64 * 3 * 1000000 + mcp->sclk_rate - 1) /
201 ret = mcp_host_register(mcp, data->codec_pdata);
206 release_mem_region(0x80060000, 0x60);
207 platform_set_drvdata(pdev, NULL);
213 static int mcp_sa11x0_remove(struct platform_device *dev)
215 struct mcp *mcp = platform_get_drvdata(dev);
217 platform_set_drvdata(dev, NULL);
218 mcp_host_unregister(mcp);
219 release_mem_region(0x80060000, 0x60);
224 static int mcp_sa11x0_suspend(struct platform_device *dev, pm_message_t state)
226 struct mcp *mcp = platform_get_drvdata(dev);
228 priv(mcp)->mccr0 = Ser4MCCR0;
229 priv(mcp)->mccr1 = Ser4MCCR1;
230 Ser4MCCR0 &= ~MCCR0_MCE;
235 static int mcp_sa11x0_resume(struct platform_device *dev)
237 struct mcp *mcp = platform_get_drvdata(dev);
239 Ser4MCCR1 = priv(mcp)->mccr1;
240 Ser4MCCR0 = priv(mcp)->mccr0;
246 * The driver for the SA11x0 MCP port.
248 MODULE_ALIAS("platform:sa11x0-mcp");
250 static struct platform_driver mcp_sa11x0_driver = {
251 .probe = mcp_sa11x0_probe,
252 .remove = mcp_sa11x0_remove,
253 .suspend = mcp_sa11x0_suspend,
254 .resume = mcp_sa11x0_resume,
256 .name = "sa11x0-mcp",
261 * This needs re-working
263 module_platform_driver(mcp_sa11x0_driver);
265 MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
266 MODULE_DESCRIPTION("SA11x0 multimedia communications port driver");
267 MODULE_LICENSE("GPL");