2 * mcpdm.c -- McPDM interface driver
4 * Author: Jorge Eduardo Candelaria <x0107209@ti.com>
5 * Copyright (C) 2009 - Texas Instruments, Inc.
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * version 2 as published by the Free Software Foundation.
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
23 #include <linux/module.h>
24 #include <linux/init.h>
25 #include <linux/device.h>
26 #include <linux/platform_device.h>
27 #include <linux/wait.h>
28 #include <linux/interrupt.h>
29 #include <linux/err.h>
30 #include <linux/clk.h>
31 #include <linux/delay.h>
33 #include <linux/irq.h>
37 static struct omap_mcpdm
*mcpdm
;
39 static inline void omap_mcpdm_write(u16 reg
, u32 val
)
41 __raw_writel(val
, mcpdm
->io_base
+ reg
);
44 static inline int omap_mcpdm_read(u16 reg
)
46 return __raw_readl(mcpdm
->io_base
+ reg
);
49 static void omap_mcpdm_reg_dump(void)
51 dev_dbg(mcpdm
->dev
, "***********************\n");
52 dev_dbg(mcpdm
->dev
, "IRQSTATUS_RAW: 0x%04x\n",
53 omap_mcpdm_read(MCPDM_IRQSTATUS_RAW
));
54 dev_dbg(mcpdm
->dev
, "IRQSTATUS: 0x%04x\n",
55 omap_mcpdm_read(MCPDM_IRQSTATUS
));
56 dev_dbg(mcpdm
->dev
, "IRQENABLE_SET: 0x%04x\n",
57 omap_mcpdm_read(MCPDM_IRQENABLE_SET
));
58 dev_dbg(mcpdm
->dev
, "IRQENABLE_CLR: 0x%04x\n",
59 omap_mcpdm_read(MCPDM_IRQENABLE_CLR
));
60 dev_dbg(mcpdm
->dev
, "IRQWAKE_EN: 0x%04x\n",
61 omap_mcpdm_read(MCPDM_IRQWAKE_EN
));
62 dev_dbg(mcpdm
->dev
, "DMAENABLE_SET: 0x%04x\n",
63 omap_mcpdm_read(MCPDM_DMAENABLE_SET
));
64 dev_dbg(mcpdm
->dev
, "DMAENABLE_CLR: 0x%04x\n",
65 omap_mcpdm_read(MCPDM_DMAENABLE_CLR
));
66 dev_dbg(mcpdm
->dev
, "DMAWAKEEN: 0x%04x\n",
67 omap_mcpdm_read(MCPDM_DMAWAKEEN
));
68 dev_dbg(mcpdm
->dev
, "CTRL: 0x%04x\n",
69 omap_mcpdm_read(MCPDM_CTRL
));
70 dev_dbg(mcpdm
->dev
, "DN_DATA: 0x%04x\n",
71 omap_mcpdm_read(MCPDM_DN_DATA
));
72 dev_dbg(mcpdm
->dev
, "UP_DATA: 0x%04x\n",
73 omap_mcpdm_read(MCPDM_UP_DATA
));
74 dev_dbg(mcpdm
->dev
, "FIFO_CTRL_DN: 0x%04x\n",
75 omap_mcpdm_read(MCPDM_FIFO_CTRL_DN
));
76 dev_dbg(mcpdm
->dev
, "FIFO_CTRL_UP: 0x%04x\n",
77 omap_mcpdm_read(MCPDM_FIFO_CTRL_UP
));
78 dev_dbg(mcpdm
->dev
, "DN_OFFSET: 0x%04x\n",
79 omap_mcpdm_read(MCPDM_DN_OFFSET
));
80 dev_dbg(mcpdm
->dev
, "***********************\n");
84 * Takes the McPDM module in and out of reset state.
85 * Uplink and downlink can be reset individually.
87 static void omap_mcpdm_reset_capture(int reset
)
89 int ctrl
= omap_mcpdm_read(MCPDM_CTRL
);
96 omap_mcpdm_write(MCPDM_CTRL
, ctrl
);
99 static void omap_mcpdm_reset_playback(int reset
)
101 int ctrl
= omap_mcpdm_read(MCPDM_CTRL
);
108 omap_mcpdm_write(MCPDM_CTRL
, ctrl
);
112 * Enables the transfer through the PDM interface to/from the Phoenix
113 * codec by enabling the corresponding UP or DN channels.
115 void omap_mcpdm_start(int stream
)
117 int ctrl
= omap_mcpdm_read(MCPDM_CTRL
);
120 ctrl
|= mcpdm
->up_channels
;
122 ctrl
|= mcpdm
->dn_channels
;
124 omap_mcpdm_write(MCPDM_CTRL
, ctrl
);
128 * Disables the transfer through the PDM interface to/from the Phoenix
129 * codec by disabling the corresponding UP or DN channels.
131 void omap_mcpdm_stop(int stream
)
133 int ctrl
= omap_mcpdm_read(MCPDM_CTRL
);
136 ctrl
&= ~mcpdm
->up_channels
;
138 ctrl
&= ~mcpdm
->dn_channels
;
140 omap_mcpdm_write(MCPDM_CTRL
, ctrl
);
144 * Configures McPDM uplink for audio recording.
145 * This function should be called before omap_mcpdm_start.
147 int omap_mcpdm_capture_open(struct omap_mcpdm_link
*uplink
)
155 mcpdm
->uplink
= uplink
;
157 /* Enable irq request generation */
158 irq_mask
|= uplink
->irq_mask
& MCPDM_UPLINK_IRQ_MASK
;
159 omap_mcpdm_write(MCPDM_IRQENABLE_SET
, irq_mask
);
161 /* Configure uplink threshold */
162 if (uplink
->threshold
> UP_THRES_MAX
)
163 uplink
->threshold
= UP_THRES_MAX
;
165 omap_mcpdm_write(MCPDM_FIFO_CTRL_UP
, uplink
->threshold
);
167 /* Configure DMA controller */
168 omap_mcpdm_write(MCPDM_DMAENABLE_SET
, DMA_UP_ENABLE
);
170 /* Set pdm out format */
171 ctrl
= omap_mcpdm_read(MCPDM_CTRL
);
172 ctrl
&= ~PDMOUTFORMAT
;
173 ctrl
|= uplink
->format
& PDMOUTFORMAT
;
175 /* Uplink channels */
176 mcpdm
->up_channels
= uplink
->channels
& (PDM_UP_MASK
| PDM_STATUS_MASK
);
178 omap_mcpdm_write(MCPDM_CTRL
, ctrl
);
184 * Configures McPDM downlink for audio playback.
185 * This function should be called before omap_mcpdm_start.
187 int omap_mcpdm_playback_open(struct omap_mcpdm_link
*downlink
)
195 mcpdm
->downlink
= downlink
;
197 /* Enable irq request generation */
198 irq_mask
|= downlink
->irq_mask
& MCPDM_DOWNLINK_IRQ_MASK
;
199 omap_mcpdm_write(MCPDM_IRQENABLE_SET
, irq_mask
);
201 /* Configure uplink threshold */
202 if (downlink
->threshold
> DN_THRES_MAX
)
203 downlink
->threshold
= DN_THRES_MAX
;
205 omap_mcpdm_write(MCPDM_FIFO_CTRL_DN
, downlink
->threshold
);
207 /* Enable DMA request generation */
208 omap_mcpdm_write(MCPDM_DMAENABLE_SET
, DMA_DN_ENABLE
);
210 /* Set pdm out format */
211 ctrl
= omap_mcpdm_read(MCPDM_CTRL
);
212 ctrl
&= ~PDMOUTFORMAT
;
213 ctrl
|= downlink
->format
& PDMOUTFORMAT
;
215 /* Downlink channels */
216 mcpdm
->dn_channels
= downlink
->channels
& (PDM_DN_MASK
| PDM_CMD_MASK
);
218 omap_mcpdm_write(MCPDM_CTRL
, ctrl
);
224 * Cleans McPDM uplink configuration.
225 * This function should be called when the stream is closed.
227 int omap_mcpdm_capture_close(struct omap_mcpdm_link
*uplink
)
234 /* Disable irq request generation */
235 irq_mask
|= uplink
->irq_mask
& MCPDM_UPLINK_IRQ_MASK
;
236 omap_mcpdm_write(MCPDM_IRQENABLE_CLR
, irq_mask
);
238 /* Disable DMA request generation */
239 omap_mcpdm_write(MCPDM_DMAENABLE_CLR
, DMA_UP_ENABLE
);
241 /* Clear Downlink channels */
242 mcpdm
->up_channels
= 0;
244 mcpdm
->uplink
= NULL
;
250 * Cleans McPDM downlink configuration.
251 * This function should be called when the stream is closed.
253 int omap_mcpdm_playback_close(struct omap_mcpdm_link
*downlink
)
260 /* Disable irq request generation */
261 irq_mask
|= downlink
->irq_mask
& MCPDM_DOWNLINK_IRQ_MASK
;
262 omap_mcpdm_write(MCPDM_IRQENABLE_CLR
, irq_mask
);
264 /* Disable DMA request generation */
265 omap_mcpdm_write(MCPDM_DMAENABLE_CLR
, DMA_DN_ENABLE
);
267 /* clear Downlink channels */
268 mcpdm
->dn_channels
= 0;
270 mcpdm
->downlink
= NULL
;
275 static irqreturn_t
omap_mcpdm_irq_handler(int irq
, void *dev_id
)
277 struct omap_mcpdm
*mcpdm_irq
= dev_id
;
280 irq_status
= omap_mcpdm_read(MCPDM_IRQSTATUS
);
282 /* Acknowledge irq event */
283 omap_mcpdm_write(MCPDM_IRQSTATUS
, irq_status
);
285 if (irq
& MCPDM_DN_IRQ_FULL
) {
286 dev_err(mcpdm_irq
->dev
, "DN FIFO error %x\n", irq_status
);
287 omap_mcpdm_reset_playback(1);
288 omap_mcpdm_playback_open(mcpdm_irq
->downlink
);
289 omap_mcpdm_reset_playback(0);
292 if (irq
& MCPDM_DN_IRQ_EMPTY
) {
293 dev_err(mcpdm_irq
->dev
, "DN FIFO error %x\n", irq_status
);
294 omap_mcpdm_reset_playback(1);
295 omap_mcpdm_playback_open(mcpdm_irq
->downlink
);
296 omap_mcpdm_reset_playback(0);
299 if (irq
& MCPDM_DN_IRQ
) {
300 dev_dbg(mcpdm_irq
->dev
, "DN write request\n");
303 if (irq
& MCPDM_UP_IRQ_FULL
) {
304 dev_err(mcpdm_irq
->dev
, "UP FIFO error %x\n", irq_status
);
305 omap_mcpdm_reset_capture(1);
306 omap_mcpdm_capture_open(mcpdm_irq
->uplink
);
307 omap_mcpdm_reset_capture(0);
310 if (irq
& MCPDM_UP_IRQ_EMPTY
) {
311 dev_err(mcpdm_irq
->dev
, "UP FIFO error %x\n", irq_status
);
312 omap_mcpdm_reset_capture(1);
313 omap_mcpdm_capture_open(mcpdm_irq
->uplink
);
314 omap_mcpdm_reset_capture(0);
317 if (irq
& MCPDM_UP_IRQ
) {
318 dev_dbg(mcpdm_irq
->dev
, "UP write request\n");
324 int omap_mcpdm_request(void)
328 clk_enable(mcpdm
->clk
);
330 spin_lock(&mcpdm
->lock
);
333 dev_err(mcpdm
->dev
, "McPDM interface is in use\n");
334 spin_unlock(&mcpdm
->lock
);
340 spin_unlock(&mcpdm
->lock
);
342 /* Disable lines while request is ongoing */
343 omap_mcpdm_write(MCPDM_CTRL
, 0x00);
345 ret
= request_irq(mcpdm
->irq
, omap_mcpdm_irq_handler
,
346 0, "McPDM", (void *)mcpdm
);
348 dev_err(mcpdm
->dev
, "Request for McPDM IRQ failed\n");
355 clk_disable(mcpdm
->clk
);
359 void omap_mcpdm_free(void)
361 spin_lock(&mcpdm
->lock
);
363 dev_err(mcpdm
->dev
, "McPDM interface is already free\n");
364 spin_unlock(&mcpdm
->lock
);
368 spin_unlock(&mcpdm
->lock
);
370 clk_disable(mcpdm
->clk
);
372 free_irq(mcpdm
->irq
, (void *)mcpdm
);
375 /* Enable/disable DC offset cancelation for the analog
376 * headset path (PDM channels 1 and 2).
378 int omap_mcpdm_set_offset(int offset1
, int offset2
)
382 if ((offset1
> DN_OFST_MAX
) || (offset2
> DN_OFST_MAX
))
385 offset
= (offset1
<< DN_OFST_RX1
) | (offset2
<< DN_OFST_RX2
);
387 /* offset cancellation for channel 1 */
389 offset
|= DN_OFST_RX1_EN
;
391 offset
&= ~DN_OFST_RX1_EN
;
393 /* offset cancellation for channel 2 */
395 offset
|= DN_OFST_RX2_EN
;
397 offset
&= ~DN_OFST_RX2_EN
;
399 omap_mcpdm_write(MCPDM_DN_OFFSET
, offset
);
404 static int __devinit
omap_mcpdm_probe(struct platform_device
*pdev
)
406 struct resource
*res
;
409 mcpdm
= kzalloc(sizeof(struct omap_mcpdm
), GFP_KERNEL
);
415 res
= platform_get_resource(pdev
, IORESOURCE_MEM
, 0);
417 dev_err(&pdev
->dev
, "no resource\n");
421 spin_lock_init(&mcpdm
->lock
);
423 mcpdm
->io_base
= ioremap(res
->start
, resource_size(res
));
424 if (!mcpdm
->io_base
) {
429 mcpdm
->irq
= platform_get_irq(pdev
, 0);
431 mcpdm
->clk
= clk_get(&pdev
->dev
, "pdm_ck");
432 if (IS_ERR(mcpdm
->clk
)) {
433 ret
= PTR_ERR(mcpdm
->clk
);
434 dev_err(&pdev
->dev
, "unable to get pdm_ck: %d\n", ret
);
438 mcpdm
->dev
= &pdev
->dev
;
439 platform_set_drvdata(pdev
, mcpdm
);
444 iounmap(mcpdm
->io_base
);
451 static int __devexit
omap_mcpdm_remove(struct platform_device
*pdev
)
453 struct omap_mcpdm
*mcpdm_ptr
= platform_get_drvdata(pdev
);
455 platform_set_drvdata(pdev
, NULL
);
457 clk_put(mcpdm_ptr
->clk
);
459 iounmap(mcpdm_ptr
->io_base
);
461 mcpdm_ptr
->clk
= NULL
;
463 mcpdm_ptr
->dev
= NULL
;
470 static struct platform_driver omap_mcpdm_driver
= {
471 .probe
= omap_mcpdm_probe
,
472 .remove
= __devexit_p(omap_mcpdm_remove
),
474 .name
= "omap-mcpdm",
478 static struct platform_device
*omap_mcpdm_device
;
480 static int __init
omap_mcpdm_init(void)
482 return platform_driver_register(&omap_mcpdm_driver
);
484 arch_initcall(omap_mcpdm_init
);