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/*
* Wireless Host Controller (WHC) initialization.
*
* Copyright (C) 2007 Cambridge Silicon Radio Ltd.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/kernel.h>
#include <linux/dma-mapping.h>
#include <linux/uwb/umc.h>
#include "../../wusbcore/wusbhc.h"
#include "whcd.h"
/*
* Reset the host controller.
*/
static void whc_hw_reset(struct whc *whc)
{
le_writel(WUSBCMD_WHCRESET, whc->base + WUSBCMD);
whci_wait_for(&whc->umc->dev, whc->base + WUSBCMD, WUSBCMD_WHCRESET, 0,
100, "reset");
}
static void whc_hw_init_di_buf(struct whc *whc)
{
int d;
/* Disable all entries in the Device Information buffer. */
for (d = 0; d < whc->n_devices; d++)
whc->di_buf[d].addr_sec_info = WHC_DI_DISABLE;
le_writeq(whc->di_buf_dma, whc->base + WUSBDEVICEINFOADDR);
}
static void whc_hw_init_dn_buf(struct whc *whc)
{
/* Clear the Device Notification buffer to ensure the V (valid)
* bits are clear. */
memset(whc->dn_buf, 0, 4096);
le_writeq(whc->dn_buf_dma, whc->base + WUSBDNTSBUFADDR);
}
int whc_init(struct whc *whc)
{
u32 whcsparams;
int ret, i;
resource_size_t start, len;
spin_lock_init(&whc->lock);
mutex_init(&whc->mutex);
init_waitqueue_head(&whc->cmd_wq);
init_waitqueue_head(&whc->async_list_wq);
init_waitqueue_head(&whc->periodic_list_wq);
whc->workqueue = create_singlethread_workqueue(dev_name(&whc->umc->dev));
if (whc->workqueue == NULL) {
ret = -ENOMEM;
goto error;
}
INIT_WORK(&whc->dn_work, whc_dn_work);
INIT_WORK(&whc->async_work, scan_async_work);
INIT_LIST_HEAD(&whc->async_list);
INIT_LIST_HEAD(&whc->async_removed_list);
INIT_WORK(&whc->periodic_work, scan_periodic_work);
for (i = 0; i < 5; i++)
INIT_LIST_HEAD(&whc->periodic_list[i]);
INIT_LIST_HEAD(&whc->periodic_removed_list);
/* Map HC registers. */
start = whc->umc->resource.start;
len = whc->umc->resource.end - start + 1;
if (!request_mem_region(start, len, "whci-hc")) {
dev_err(&whc->umc->dev, "can't request HC region\n");
ret = -EBUSY;
goto error;
}
whc->base_phys = start;
whc->base = ioremap(start, len);
if (!whc->base) {
dev_err(&whc->umc->dev, "ioremap\n");
ret = -ENOMEM;
goto error;
}
whc_hw_reset(whc);
/* Read maximum number of devices, keys and MMC IEs. */
whcsparams = le_readl(whc->base + WHCSPARAMS);
whc->n_devices = WHCSPARAMS_TO_N_DEVICES(whcsparams);
whc->n_keys = WHCSPARAMS_TO_N_KEYS(whcsparams);
whc->n_mmc_ies = WHCSPARAMS_TO_N_MMC_IES(whcsparams);
dev_dbg(&whc->umc->dev, "N_DEVICES = %d, N_KEYS = %d, N_MMC_IES = %d\n",
whc->n_devices, whc->n_keys, whc->n_mmc_ies);
whc->qset_pool = dma_pool_create("qset", &whc->umc->dev,
sizeof(struct whc_qset), 64, 0);
if (whc->qset_pool == NULL) {
ret = -ENOMEM;
goto error;
}
ret = asl_init(whc);
if (ret < 0)
goto error;
ret = pzl_init(whc);
if (ret < 0)
goto error;
/* Allocate and initialize a buffer for generic commands, the
Device Information buffer, and the Device Notification
buffer. */
whc->gen_cmd_buf = dma_alloc_coherent(&whc->umc->dev, WHC_GEN_CMD_DATA_LEN,
&whc->gen_cmd_buf_dma, GFP_KERNEL);
if (whc->gen_cmd_buf == NULL) {
ret = -ENOMEM;
goto error;
}
whc->dn_buf = dma_alloc_coherent(&whc->umc->dev,
sizeof(struct dn_buf_entry) * WHC_N_DN_ENTRIES,
&whc->dn_buf_dma, GFP_KERNEL);
if (!whc->dn_buf) {
ret = -ENOMEM;
goto error;
}
whc_hw_init_dn_buf(whc);
whc->di_buf = dma_alloc_coherent(&whc->umc->dev,
sizeof(struct di_buf_entry) * whc->n_devices,
&whc->di_buf_dma, GFP_KERNEL);
if (!whc->di_buf) {
ret = -ENOMEM;
goto error;
}
whc_hw_init_di_buf(whc);
return 0;
error:
whc_clean_up(whc);
return ret;
}
void whc_clean_up(struct whc *whc)
{
resource_size_t len;
if (whc->di_buf)
dma_free_coherent(&whc->umc->dev, sizeof(struct di_buf_entry) * whc->n_devices,
whc->di_buf, whc->di_buf_dma);
if (whc->dn_buf)
dma_free_coherent(&whc->umc->dev, sizeof(struct dn_buf_entry) * WHC_N_DN_ENTRIES,
whc->dn_buf, whc->dn_buf_dma);
if (whc->gen_cmd_buf)
dma_free_coherent(&whc->umc->dev, WHC_GEN_CMD_DATA_LEN,
whc->gen_cmd_buf, whc->gen_cmd_buf_dma);
pzl_clean_up(whc);
asl_clean_up(whc);
if (whc->qset_pool)
dma_pool_destroy(whc->qset_pool);
len = whc->umc->resource.end - whc->umc->resource.start + 1;
if (whc->base)
iounmap(whc->base);
if (whc->base_phys)
release_mem_region(whc->base_phys, len);
if (whc->workqueue)
destroy_workqueue(whc->workqueue);
}
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