1 // SPDX-License-Identifier: GPL-2.0
3 * Wireless Host Controller (WHC) initialization.
5 * Copyright (C) 2007 Cambridge Silicon Radio Ltd.
7 #include <linux/kernel.h>
9 #include <linux/dma-mapping.h>
10 #include <linux/uwb/umc.h>
12 #include "../../wusbcore/wusbhc.h"
17 * Reset the host controller.
19 static void whc_hw_reset(struct whc *whc)
21 le_writel(WUSBCMD_WHCRESET, whc->base + WUSBCMD);
22 whci_wait_for(&whc->umc->dev, whc->base + WUSBCMD, WUSBCMD_WHCRESET, 0,
26 static void whc_hw_init_di_buf(struct whc *whc)
30 /* Disable all entries in the Device Information buffer. */
31 for (d = 0; d < whc->n_devices; d++)
32 whc->di_buf[d].addr_sec_info = WHC_DI_DISABLE;
34 le_writeq(whc->di_buf_dma, whc->base + WUSBDEVICEINFOADDR);
37 static void whc_hw_init_dn_buf(struct whc *whc)
39 /* Clear the Device Notification buffer to ensure the V (valid)
41 memset(whc->dn_buf, 0, 4096);
43 le_writeq(whc->dn_buf_dma, whc->base + WUSBDNTSBUFADDR);
46 int whc_init(struct whc *whc)
50 resource_size_t start, len;
52 spin_lock_init(&whc->lock);
53 mutex_init(&whc->mutex);
54 init_waitqueue_head(&whc->cmd_wq);
55 init_waitqueue_head(&whc->async_list_wq);
56 init_waitqueue_head(&whc->periodic_list_wq);
57 whc->workqueue = alloc_ordered_workqueue(dev_name(&whc->umc->dev), 0);
58 if (whc->workqueue == NULL) {
62 INIT_WORK(&whc->dn_work, whc_dn_work);
64 INIT_WORK(&whc->async_work, scan_async_work);
65 INIT_LIST_HEAD(&whc->async_list);
66 INIT_LIST_HEAD(&whc->async_removed_list);
68 INIT_WORK(&whc->periodic_work, scan_periodic_work);
69 for (i = 0; i < 5; i++)
70 INIT_LIST_HEAD(&whc->periodic_list[i]);
71 INIT_LIST_HEAD(&whc->periodic_removed_list);
73 /* Map HC registers. */
74 start = whc->umc->resource.start;
75 len = whc->umc->resource.end - start + 1;
76 if (!request_mem_region(start, len, "whci-hc")) {
77 dev_err(&whc->umc->dev, "can't request HC region\n");
81 whc->base_phys = start;
82 whc->base = ioremap(start, len);
84 dev_err(&whc->umc->dev, "ioremap\n");
91 /* Read maximum number of devices, keys and MMC IEs. */
92 whcsparams = le_readl(whc->base + WHCSPARAMS);
93 whc->n_devices = WHCSPARAMS_TO_N_DEVICES(whcsparams);
94 whc->n_keys = WHCSPARAMS_TO_N_KEYS(whcsparams);
95 whc->n_mmc_ies = WHCSPARAMS_TO_N_MMC_IES(whcsparams);
97 dev_dbg(&whc->umc->dev, "N_DEVICES = %d, N_KEYS = %d, N_MMC_IES = %d\n",
98 whc->n_devices, whc->n_keys, whc->n_mmc_ies);
100 whc->qset_pool = dma_pool_create("qset", &whc->umc->dev,
101 sizeof(struct whc_qset), 64, 0);
102 if (whc->qset_pool == NULL) {
114 /* Allocate and initialize a buffer for generic commands, the
115 Device Information buffer, and the Device Notification
118 whc->gen_cmd_buf = dma_alloc_coherent(&whc->umc->dev, WHC_GEN_CMD_DATA_LEN,
119 &whc->gen_cmd_buf_dma, GFP_KERNEL);
120 if (whc->gen_cmd_buf == NULL) {
125 whc->dn_buf = dma_alloc_coherent(&whc->umc->dev,
126 sizeof(struct dn_buf_entry) * WHC_N_DN_ENTRIES,
127 &whc->dn_buf_dma, GFP_KERNEL);
132 whc_hw_init_dn_buf(whc);
134 whc->di_buf = dma_alloc_coherent(&whc->umc->dev,
135 sizeof(struct di_buf_entry) * whc->n_devices,
136 &whc->di_buf_dma, GFP_KERNEL);
141 whc_hw_init_di_buf(whc);
150 void whc_clean_up(struct whc *whc)
155 dma_free_coherent(&whc->umc->dev, sizeof(struct di_buf_entry) * whc->n_devices,
156 whc->di_buf, whc->di_buf_dma);
158 dma_free_coherent(&whc->umc->dev, sizeof(struct dn_buf_entry) * WHC_N_DN_ENTRIES,
159 whc->dn_buf, whc->dn_buf_dma);
160 if (whc->gen_cmd_buf)
161 dma_free_coherent(&whc->umc->dev, WHC_GEN_CMD_DATA_LEN,
162 whc->gen_cmd_buf, whc->gen_cmd_buf_dma);
167 dma_pool_destroy(whc->qset_pool);
169 len = resource_size(&whc->umc->resource);
173 release_mem_region(whc->base_phys, len);
176 destroy_workqueue(whc->workqueue);