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Russell King5e742ad2005-08-18 10:08:15 +01001/*
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/errno.h>
17#include <linux/kernel.h>
18#include <linux/delay.h>
19#include <linux/spinlock.h>
20#include <linux/slab.h>
Russell Kingd052d1b2005-10-29 19:07:23 +010021#include <linux/platform_device.h>
Russell King5e742ad2005-08-18 10:08:15 +010022
Russell Kingdcea83a2008-11-29 11:40:28 +000023#include <mach/dma.h>
Russell Kinga09e64f2008-08-05 16:14:15 +010024#include <mach/hardware.h>
Russell King5e742ad2005-08-18 10:08:15 +010025#include <asm/mach-types.h>
26#include <asm/system.h>
Russell Kinga09e64f2008-08-05 16:14:15 +010027#include <mach/mcp.h>
Russell King5e742ad2005-08-18 10:08:15 +010028
Russell Kinga09e64f2008-08-05 16:14:15 +010029#include <mach/assabet.h>
Russell King5e742ad2005-08-18 10:08:15 +010030
31#include "mcp.h"
32
33struct mcp_sa11x0 {
34 u32 mccr0;
35 u32 mccr1;
36};
37
38#define priv(mcp) ((struct mcp_sa11x0 *)mcp_priv(mcp))
39
40static void
41mcp_sa11x0_set_telecom_divisor(struct mcp *mcp, unsigned int divisor)
42{
43 unsigned int mccr0;
44
45 divisor /= 32;
46
47 mccr0 = Ser4MCCR0 & ~0x00007f00;
48 mccr0 |= divisor << 8;
49 Ser4MCCR0 = mccr0;
50}
51
52static void
53mcp_sa11x0_set_audio_divisor(struct mcp *mcp, unsigned int divisor)
54{
55 unsigned int mccr0;
56
57 divisor /= 32;
58
59 mccr0 = Ser4MCCR0 & ~0x0000007f;
60 mccr0 |= divisor;
61 Ser4MCCR0 = mccr0;
62}
63
64/*
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
68 * wait.
69 */
70static void
71mcp_sa11x0_write(struct mcp *mcp, unsigned int reg, unsigned int val)
72{
73 int ret = -ETIME;
74 int i;
75
76 Ser4MCDR2 = reg << 17 | MCDR2_Wr | (val & 0xffff);
77
78 for (i = 0; i < 2; i++) {
79 udelay(mcp->rw_timeout);
80 if (Ser4MCSR & MCSR_CWC) {
81 ret = 0;
82 break;
83 }
84 }
85
86 if (ret < 0)
87 printk(KERN_WARNING "mcp: write timed out\n");
88}
89
90/*
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
94 * wait.
95 */
96static unsigned int
97mcp_sa11x0_read(struct mcp *mcp, unsigned int reg)
98{
99 int ret = -ETIME;
100 int i;
101
102 Ser4MCDR2 = reg << 17 | MCDR2_Rd;
103
104 for (i = 0; i < 2; i++) {
105 udelay(mcp->rw_timeout);
106 if (Ser4MCSR & MCSR_CRC) {
107 ret = Ser4MCDR2 & 0xffff;
108 break;
109 }
110 }
111
112 if (ret < 0)
113 printk(KERN_WARNING "mcp: read timed out\n");
114
115 return ret;
116}
117
118static void mcp_sa11x0_enable(struct mcp *mcp)
119{
120 Ser4MCSR = -1;
121 Ser4MCCR0 |= MCCR0_MCE;
122}
123
124static void mcp_sa11x0_disable(struct mcp *mcp)
125{
126 Ser4MCCR0 &= ~MCCR0_MCE;
127}
128
129/*
130 * Our methods.
131 */
132static 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,
139};
140
Russell King3ae5eae2005-11-09 22:32:44 +0000141static int mcp_sa11x0_probe(struct platform_device *pdev)
Russell King5e742ad2005-08-18 10:08:15 +0100142{
Russell King323cdfc2005-08-18 10:10:46 +0100143 struct mcp_plat_data *data = pdev->dev.platform_data;
Russell King5e742ad2005-08-18 10:08:15 +0100144 struct mcp *mcp;
145 int ret;
146
Russell King323cdfc2005-08-18 10:10:46 +0100147 if (!data)
Russell King5e742ad2005-08-18 10:08:15 +0100148 return -ENODEV;
149
150 if (!request_mem_region(0x80060000, 0x60, "sa11x0-mcp"))
151 return -EBUSY;
152
153 mcp = mcp_host_alloc(&pdev->dev, sizeof(struct mcp_sa11x0));
154 if (!mcp) {
155 ret = -ENOMEM;
156 goto release;
157 }
158
159 mcp->owner = THIS_MODULE;
160 mcp->ops = &mcp_sa11x0;
Russell King323cdfc2005-08-18 10:10:46 +0100161 mcp->sclk_rate = data->sclk_rate;
Russell King5e742ad2005-08-18 10:08:15 +0100162 mcp->dma_audio_rd = DMA_Ser4MCP0Rd;
163 mcp->dma_audio_wr = DMA_Ser4MCP0Wr;
164 mcp->dma_telco_rd = DMA_Ser4MCP1Rd;
165 mcp->dma_telco_wr = DMA_Ser4MCP1Wr;
166
Russell King3ae5eae2005-11-09 22:32:44 +0000167 platform_set_drvdata(pdev, mcp);
Russell King5e742ad2005-08-18 10:08:15 +0100168
169 if (machine_is_assabet()) {
170 ASSABET_BCR_set(ASSABET_BCR_CODEC_RST);
171 }
172
173 /*
174 * Setup the PPC unit correctly.
175 */
176 PPDR &= ~PPC_RXD4;
177 PPDR |= PPC_TXD4 | PPC_SCLK | PPC_SFRM;
178 PSDR |= PPC_RXD4;
179 PSDR &= ~(PPC_TXD4 | PPC_SCLK | PPC_SFRM);
180 PPSR &= ~(PPC_TXD4 | PPC_SCLK | PPC_SFRM);
181
Russell King323cdfc2005-08-18 10:10:46 +0100182 /*
183 * Initialise device. Note that we initially
184 * set the sampling rate to minimum.
185 */
Russell King5e742ad2005-08-18 10:08:15 +0100186 Ser4MCSR = -1;
Russell King323cdfc2005-08-18 10:10:46 +0100187 Ser4MCCR1 = data->mccr1;
188 Ser4MCCR0 = data->mccr0 | 0x7f7f;
Russell King5e742ad2005-08-18 10:08:15 +0100189
190 /*
191 * Calculate the read/write timeout (us) from the bit clock
192 * rate. This is the period for 3 64-bit frames. Always
193 * round this time up.
194 */
195 mcp->rw_timeout = (64 * 3 * 1000000 + mcp->sclk_rate - 1) /
196 mcp->sclk_rate;
197
198 ret = mcp_host_register(mcp);
199 if (ret == 0)
200 goto out;
201
202 release:
203 release_mem_region(0x80060000, 0x60);
Russell King3ae5eae2005-11-09 22:32:44 +0000204 platform_set_drvdata(pdev, NULL);
Russell King5e742ad2005-08-18 10:08:15 +0100205
206 out:
207 return ret;
208}
209
Russell King3ae5eae2005-11-09 22:32:44 +0000210static int mcp_sa11x0_remove(struct platform_device *dev)
Russell King5e742ad2005-08-18 10:08:15 +0100211{
Russell King3ae5eae2005-11-09 22:32:44 +0000212 struct mcp *mcp = platform_get_drvdata(dev);
Russell King5e742ad2005-08-18 10:08:15 +0100213
Russell King3ae5eae2005-11-09 22:32:44 +0000214 platform_set_drvdata(dev, NULL);
Russell King5e742ad2005-08-18 10:08:15 +0100215 mcp_host_unregister(mcp);
216 release_mem_region(0x80060000, 0x60);
217
218 return 0;
219}
220
Russell King3ae5eae2005-11-09 22:32:44 +0000221static int mcp_sa11x0_suspend(struct platform_device *dev, pm_message_t state)
Russell King5e742ad2005-08-18 10:08:15 +0100222{
Russell King3ae5eae2005-11-09 22:32:44 +0000223 struct mcp *mcp = platform_get_drvdata(dev);
Russell King5e742ad2005-08-18 10:08:15 +0100224
Russell King9480e302005-10-28 09:52:56 -0700225 priv(mcp)->mccr0 = Ser4MCCR0;
226 priv(mcp)->mccr1 = Ser4MCCR1;
227 Ser4MCCR0 &= ~MCCR0_MCE;
228
Russell King5e742ad2005-08-18 10:08:15 +0100229 return 0;
230}
231
Russell King3ae5eae2005-11-09 22:32:44 +0000232static int mcp_sa11x0_resume(struct platform_device *dev)
Russell King5e742ad2005-08-18 10:08:15 +0100233{
Russell King3ae5eae2005-11-09 22:32:44 +0000234 struct mcp *mcp = platform_get_drvdata(dev);
Russell King5e742ad2005-08-18 10:08:15 +0100235
Russell King9480e302005-10-28 09:52:56 -0700236 Ser4MCCR1 = priv(mcp)->mccr1;
237 Ser4MCCR0 = priv(mcp)->mccr0;
238
Russell King5e742ad2005-08-18 10:08:15 +0100239 return 0;
240}
241
242/*
243 * The driver for the SA11x0 MCP port.
244 */
Kay Sievers4f46d6e2008-07-25 01:45:47 -0700245MODULE_ALIAS("platform:sa11x0-mcp");
246
Russell King3ae5eae2005-11-09 22:32:44 +0000247static struct platform_driver mcp_sa11x0_driver = {
Russell King5e742ad2005-08-18 10:08:15 +0100248 .probe = mcp_sa11x0_probe,
249 .remove = mcp_sa11x0_remove,
250 .suspend = mcp_sa11x0_suspend,
251 .resume = mcp_sa11x0_resume,
Russell King3ae5eae2005-11-09 22:32:44 +0000252 .driver = {
253 .name = "sa11x0-mcp",
254 },
Russell King5e742ad2005-08-18 10:08:15 +0100255};
256
257/*
258 * This needs re-working
259 */
260static int __init mcp_sa11x0_init(void)
261{
Russell King3ae5eae2005-11-09 22:32:44 +0000262 return platform_driver_register(&mcp_sa11x0_driver);
Russell King5e742ad2005-08-18 10:08:15 +0100263}
264
265static void __exit mcp_sa11x0_exit(void)
266{
Russell King3ae5eae2005-11-09 22:32:44 +0000267 platform_driver_unregister(&mcp_sa11x0_driver);
Russell King5e742ad2005-08-18 10:08:15 +0100268}
269
270module_init(mcp_sa11x0_init);
271module_exit(mcp_sa11x0_exit);
272
273MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
274MODULE_DESCRIPTION("SA11x0 multimedia communications port driver");
275MODULE_LICENSE("GPL");