1 // SPDX-License-Identifier: GPL-2.0-or-later
4     Copyright (C) 2003-2004  Kevin Thayer <nufan_wfk at yahoo.com>
6     Copyright (C) 2005-2007  Hans Verkuil <hverkuil@xs4all.nl>
10 #include "ivtv-driver.h"
11 #include "ivtv-mailbox.h"
33 	const char *name;	/* The name of the command */  member
133 	u32 flags = readl(&mbdata->mbox[mb].flags);  in try_mailbox()
137 	if (is_free && !test_and_set_bit(mb, &mbdata->busy)) {  in try_mailbox()
138 		write_sync(IVTV_MBOX_DRIVER_BUSY, &mbdata->mbox[mb].flags);  in try_mailbox()
150 	int max_mbox = mbdata->max_mbox;  in get_mailbox()
158 	/* find free non-DMA mailbox */  in get_mailbox()
172 	return -ENODEV;  in get_mailbox()
175 static void write_mailbox(volatile struct ivtv_mailbox __iomem *mbox, int cmd, int args, u32 data[])  in write_mailbox()  argument
179 	write_sync(cmd, &mbox->cmd);  in write_mailbox()
180 	write_sync(IVTV_API_STD_TIMEOUT, &mbox->timeout);  in write_mailbox()
183 		write_sync(data[i], &mbox->data[i]);  in write_mailbox()
185 	write_sync(IVTV_MBOX_DRIVER_DONE | IVTV_MBOX_DRIVER_BUSY, &mbox->flags);  in write_mailbox()
192 	for (i = 0; i <= mbdata->max_mbox; i++) {  in clear_all_mailboxes()
194 			i, readl(&mbdata->mbox[i].cmd), readl(&mbdata->mbox[i].flags));  in clear_all_mailboxes()
195 		write_sync(0, &mbdata->mbox[i].flags);  in clear_all_mailboxes()
196 		clear_bit(i, &mbdata->busy);  in clear_all_mailboxes()
202 	struct ivtv_mailbox_data *mbdata = (cmd >= 128) ? &itv->enc_mbox : &itv->dec_mbox;  in ivtv_api_call()
203 	volatile struct ivtv_mailbox __iomem *mbox;  in ivtv_api_call()  local
211 		return -ENODEV;  in ivtv_api_call()
214 	    cmd < 0 || cmd > 255 || api_info[cmd].name == NULL) {  in ivtv_api_call()
216 		return -EINVAL;  in ivtv_api_call()
220 	    IVTV_DEBUG_HI_MB("MB Call: %s\n", api_info[cmd].name);  in ivtv_api_call()
223 	    IVTV_DEBUG_MB("MB Call: %s\n", api_info[cmd].name);  in ivtv_api_call()
233 	if (itv->api_cache[cmd].last_jiffies &&  in ivtv_api_call()
235 			itv->api_cache[cmd].last_jiffies +  in ivtv_api_call()
237 	    !memcmp(data, itv->api_cache[cmd].data, sizeof(itv->api_cache[cmd].data))) {  in ivtv_api_call()
238 		itv->api_cache[cmd].last_jiffies = jiffies;  in ivtv_api_call()
246 			mb = i % (mbdata->max_mbox + 1);  in ivtv_api_call()
248 				write_mailbox(&mbdata->mbox[mb], cmd, args, data);  in ivtv_api_call()
249 				clear_bit(mb, &mbdata->busy);  in ivtv_api_call()
253 					api_info[cmd].name, mb, readl(&mbdata->mbox[mb].flags));  in ivtv_api_call()
255 		IVTV_WARN("Could not find free DMA mailbox for %s\n", api_info[cmd].name);  in ivtv_api_call()
257 		return -EBUSY;  in ivtv_api_call()
265 		IVTV_DEBUG_WARN("No free mailbox found (%s)\n", api_info[cmd].name);  in ivtv_api_call()
267 		return -EBUSY;  in ivtv_api_call()
269 	mbox = &mbdata->mbox[mb];  in ivtv_api_call()
270 	write_mailbox(mbox, cmd, args, data);  in ivtv_api_call()
272 		memcpy(itv->api_cache[cmd].data, data, sizeof(itv->api_cache[cmd].data));  in ivtv_api_call()
273 		itv->api_cache[cmd].last_jiffies = jiffies;  in ivtv_api_call()
276 		clear_bit(mb, &mbdata->busy);  in ivtv_api_call()
286 			if (readl(&mbox->flags) & IVTV_MBOX_FIRMWARE_DONE)  in ivtv_api_call()
290 	while (!(readl(&mbox->flags) & IVTV_MBOX_FIRMWARE_DONE)) {  in ivtv_api_call()
292 			IVTV_DEBUG_WARN("Could not get result (%s)\n", api_info[cmd].name);  in ivtv_api_call()
294 			write_sync(0, &mbox->flags);  in ivtv_api_call()
295 			clear_bit(mb, &mbdata->busy);  in ivtv_api_call()
296 			return -EIO;  in ivtv_api_call()
305 				api_info[cmd].name,  in ivtv_api_call()
306 				jiffies_to_msecs(jiffies - then));  in ivtv_api_call()
309 		data[i] = readl(&mbox->data[i]);  in ivtv_api_call()
310 	write_sync(0, &mbox->flags);  in ivtv_api_call()
311 	clear_bit(mb, &mbdata->busy);  in ivtv_api_call()
322 	return (res == -EBUSY) ? ivtv_api_call(itv, cmd, args, data) : res;  in ivtv_api()
361 	volatile u32 __iomem *p = mbdata->mbox[mb].data;  in ivtv_api_get_data()
372 		itv->api_cache[i].last_jiffies = 0;  in ivtv_mailbox_cache_invalidate()