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>
28 #include <mach/assabet.h>
36 #define priv(mcp) ((struct mcp_sa11x0 *)mcp_priv(mcp))
39 mcp_sa11x0_set_telecom_divisor(struct mcp *mcp, unsigned int divisor)
45 mccr0 = Ser4MCCR0 & ~0x00007f00;
46 mccr0 |= divisor << 8;
51 mcp_sa11x0_set_audio_divisor(struct mcp *mcp, unsigned int divisor)
57 mccr0 = Ser4MCCR0 & ~0x0000007f;
63 * Write data to the device. The bit should be set after 3 subframe
64 * times (each frame is 64 clocks). We wait a maximum of 6 subframes.
65 * We really should try doing something more productive while we
69 mcp_sa11x0_write(struct mcp *mcp, unsigned int reg, unsigned int val)
74 Ser4MCDR2 = reg << 17 | MCDR2_Wr | (val & 0xffff);
76 for (i = 0; i < 2; i++) {
77 udelay(mcp->rw_timeout);
78 if (Ser4MCSR & MCSR_CWC) {
85 printk(KERN_WARNING "mcp: write timed out\n");
89 * Read data from the device. The bit should be set after 3 subframe
90 * times (each frame is 64 clocks). We wait a maximum of 6 subframes.
91 * We really should try doing something more productive while we
95 mcp_sa11x0_read(struct mcp *mcp, unsigned int reg)
100 Ser4MCDR2 = reg << 17 | MCDR2_Rd;
102 for (i = 0; i < 2; i++) {
103 udelay(mcp->rw_timeout);
104 if (Ser4MCSR & MCSR_CRC) {
105 ret = Ser4MCDR2 & 0xffff;
111 printk(KERN_WARNING "mcp: read timed out\n");
116 static void mcp_sa11x0_enable(struct mcp *mcp)
119 Ser4MCCR0 |= MCCR0_MCE;
122 static void mcp_sa11x0_disable(struct mcp *mcp)
124 Ser4MCCR0 &= ~MCCR0_MCE;
130 static struct mcp_ops mcp_sa11x0 = {
131 .set_telecom_divisor = mcp_sa11x0_set_telecom_divisor,
132 .set_audio_divisor = mcp_sa11x0_set_audio_divisor,
133 .reg_write = mcp_sa11x0_write,
134 .reg_read = mcp_sa11x0_read,
135 .enable = mcp_sa11x0_enable,
136 .disable = mcp_sa11x0_disable,
139 static int mcp_sa11x0_probe(struct platform_device *pdev)
141 struct mcp_plat_data *data = pdev->dev.platform_data;
148 if (!request_mem_region(0x80060000, 0x60, "sa11x0-mcp"))
151 mcp = mcp_host_alloc(&pdev->dev, sizeof(struct mcp_sa11x0));
157 mcp->owner = THIS_MODULE;
158 mcp->ops = &mcp_sa11x0;
159 mcp->sclk_rate = data->sclk_rate;
160 mcp->dma_audio_rd = DMA_Ser4MCP0Rd;
161 mcp->dma_audio_wr = DMA_Ser4MCP0Wr;
162 mcp->dma_telco_rd = DMA_Ser4MCP1Rd;
163 mcp->dma_telco_wr = DMA_Ser4MCP1Wr;
164 mcp->gpio_base = data->gpio_base;
166 platform_set_drvdata(pdev, mcp);
168 if (machine_is_assabet()) {
169 ASSABET_BCR_set(ASSABET_BCR_CODEC_RST);
173 * Setup the PPC unit correctly.
176 PPDR |= PPC_TXD4 | PPC_SCLK | PPC_SFRM;
178 PSDR &= ~(PPC_TXD4 | PPC_SCLK | PPC_SFRM);
179 PPSR &= ~(PPC_TXD4 | PPC_SCLK | PPC_SFRM);
182 * Initialise device. Note that we initially
183 * set the sampling rate to minimum.
186 Ser4MCCR1 = data->mccr1;
187 Ser4MCCR0 = data->mccr0 | 0x7f7f;
190 * Calculate the read/write timeout (us) from the bit clock
191 * rate. This is the period for 3 64-bit frames. Always
192 * round this time up.
194 mcp->rw_timeout = (64 * 3 * 1000000 + mcp->sclk_rate - 1) /
197 ret = mcp_host_register(mcp);
202 release_mem_region(0x80060000, 0x60);
203 platform_set_drvdata(pdev, NULL);
209 static int mcp_sa11x0_remove(struct platform_device *dev)
211 struct mcp *mcp = platform_get_drvdata(dev);
213 platform_set_drvdata(dev, NULL);
214 mcp_host_unregister(mcp);
215 release_mem_region(0x80060000, 0x60);
220 static int mcp_sa11x0_suspend(struct platform_device *dev, pm_message_t state)
222 struct mcp *mcp = platform_get_drvdata(dev);
224 priv(mcp)->mccr0 = Ser4MCCR0;
225 priv(mcp)->mccr1 = Ser4MCCR1;
226 Ser4MCCR0 &= ~MCCR0_MCE;
231 static int mcp_sa11x0_resume(struct platform_device *dev)
233 struct mcp *mcp = platform_get_drvdata(dev);
235 Ser4MCCR1 = priv(mcp)->mccr1;
236 Ser4MCCR0 = priv(mcp)->mccr0;
242 * The driver for the SA11x0 MCP port.
244 MODULE_ALIAS("platform:sa11x0-mcp");
246 static struct platform_driver mcp_sa11x0_driver = {
247 .probe = mcp_sa11x0_probe,
248 .remove = mcp_sa11x0_remove,
249 .suspend = mcp_sa11x0_suspend,
250 .resume = mcp_sa11x0_resume,
252 .name = "sa11x0-mcp",
257 * This needs re-working
259 module_platform_driver(mcp_sa11x0_driver);
261 MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
262 MODULE_DESCRIPTION("SA11x0 multimedia communications port driver");
263 MODULE_LICENSE("GPL");