usb_sdio.c

// SPDX-License-Identifier: ISC
/* Copyright (C) 2020 MediaTek Inc.
 *
 * Author: Lorenzo Bianconi <[email protected]>
 *	   Sean Wang <[email protected]>
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/usb.h>

#include "mt7615.h"
#include "mac.h"
#include "mcu.h"
#include "regs.h"

const u32 mt7663_usb_sdio_reg_map[] = {
	[MT_TOP_CFG_BASE]	= 0x80020000,
	[MT_HW_BASE]		= 0x80000000,
	[MT_DMA_SHDL_BASE]	= 0x5000a000,
	[MT_HIF_BASE]		= 0x50000000,
	[MT_CSR_BASE]		= 0x40000000,
	[MT_EFUSE_ADDR_BASE]	= 0x78011000,
	[MT_TOP_MISC_BASE]	= 0x81020000,
	[MT_PLE_BASE]		= 0x82060000,
	[MT_PSE_BASE]		= 0x82068000,
	[MT_PP_BASE]		= 0x8206c000,
	[MT_WTBL_BASE_ADDR]	= 0x820e0000,
	[MT_CFG_BASE]		= 0x820f0000,
	[MT_AGG_BASE]		= 0x820f2000,
	[MT_ARB_BASE]		= 0x820f3000,
	[MT_TMAC_BASE]		= 0x820f4000,
	[MT_RMAC_BASE]		= 0x820f5000,
	[MT_DMA_BASE]		= 0x820f7000,
	[MT_PF_BASE]		= 0x820f8000,
	[MT_WTBL_BASE_ON]	= 0x820f9000,
	[MT_WTBL_BASE_OFF]	= 0x820f9800,
	[MT_LPON_BASE]		= 0x820fb000,
	[MT_MIB_BASE]		= 0x820fd000,
};
EXPORT_SYMBOL_GPL(mt7663_usb_sdio_reg_map);

static void
mt7663_usb_sdio_write_txwi(struct mt7615_dev *dev, struct mt76_wcid *wcid,
			   enum mt76_txq_id qid, struct ieee80211_sta *sta,
			   struct ieee80211_key_conf *key, int pid,
			   struct sk_buff *skb)
{
	__le32 *txwi = (__le32 *)(skb->data - MT_USB_TXD_SIZE);

	memset(txwi, 0, MT_USB_TXD_SIZE);
	mt7615_mac_write_txwi(dev, txwi, skb, wcid, sta, pid, key, qid, false);
	skb_push(skb, MT_USB_TXD_SIZE);
}

static int mt7663_usb_sdio_set_rates(struct mt7615_dev *dev,
				     struct mt7615_wtbl_rate_desc *wrd)
{
	struct mt7615_rate_desc *rate = &wrd->rate;
	struct mt7615_sta *sta = wrd->sta;
	u32 w5, w27, addr, val;
	u16 idx;

	lockdep_assert_held(&dev->mt76.mutex);

	if (!sta)
		return -EINVAL;

	if (!mt76_poll(dev, MT_WTBL_UPDATE, MT_WTBL_UPDATE_BUSY, 0, 5000))
		return -ETIMEDOUT;

	addr = mt7615_mac_wtbl_addr(dev, sta->wcid.idx);

	w27 = mt76_rr(dev, addr + 27 * 4);
	w27 &= ~MT_WTBL_W27_CC_BW_SEL;
	w27 |= FIELD_PREP(MT_WTBL_W27_CC_BW_SEL, rate->bw);

	w5 = mt76_rr(dev, addr + 5 * 4);
	w5 &= ~(MT_WTBL_W5_BW_CAP | MT_WTBL_W5_CHANGE_BW_RATE |
		MT_WTBL_W5_MPDU_OK_COUNT |
		MT_WTBL_W5_MPDU_FAIL_COUNT |
		MT_WTBL_W5_RATE_IDX);
	w5 |= FIELD_PREP(MT_WTBL_W5_BW_CAP, rate->bw) |
	      FIELD_PREP(MT_WTBL_W5_CHANGE_BW_RATE,
			 rate->bw_idx ? rate->bw_idx - 1 : 7);

	mt76_wr(dev, MT_WTBL_RIUCR0, w5);

	mt76_wr(dev, MT_WTBL_RIUCR1,
		FIELD_PREP(MT_WTBL_RIUCR1_RATE0, rate->probe_val) |
		FIELD_PREP(MT_WTBL_RIUCR1_RATE1, rate->val[0]) |
		FIELD_PREP(MT_WTBL_RIUCR1_RATE2_LO, rate->val[1]));

	mt76_wr(dev, MT_WTBL_RIUCR2,
		FIELD_PREP(MT_WTBL_RIUCR2_RATE2_HI, rate->val[1] >> 8) |
		FIELD_PREP(MT_WTBL_RIUCR2_RATE3, rate->val[1]) |
		FIELD_PREP(MT_WTBL_RIUCR2_RATE4, rate->val[2]) |
		FIELD_PREP(MT_WTBL_RIUCR2_RATE5_LO, rate->val[2]));

	mt76_wr(dev, MT_WTBL_RIUCR3,
		FIELD_PREP(MT_WTBL_RIUCR3_RATE5_HI, rate->val[2] >> 4) |
		FIELD_PREP(MT_WTBL_RIUCR3_RATE6, rate->val[3]) |
		FIELD_PREP(MT_WTBL_RIUCR3_RATE7, rate->val[3]));

	mt76_wr(dev, MT_WTBL_UPDATE,
		FIELD_PREP(MT_WTBL_UPDATE_WLAN_IDX, sta->wcid.idx) |
		MT_WTBL_UPDATE_RATE_UPDATE |
		MT_WTBL_UPDATE_TX_COUNT_CLEAR);

	mt76_wr(dev, addr + 27 * 4, w27);

	sta->rate_probe = sta->rateset[rate->rateset].probe_rate.idx != -1;

	idx = sta->vif->mt76.omac_idx;
	idx = idx > HW_BSSID_MAX ? HW_BSSID_0 : idx;
	addr = idx > 1 ? MT_LPON_TCR2(idx): MT_LPON_TCR0(idx);

	mt76_rmw(dev, addr, MT_LPON_TCR_MODE, MT_LPON_TCR_READ); /* TSF read */
	val = mt76_rr(dev, MT_LPON_UTTR0);
	sta->rate_set_tsf = (val & ~BIT(0)) | rate->rateset;

	if (!(sta->wcid.tx_info & MT_WCID_TX_INFO_SET))
		mt76_poll(dev, MT_WTBL_UPDATE, MT_WTBL_UPDATE_BUSY, 0, 5000);

	sta->rate_count = 2 * MT7615_RATE_RETRY * sta->n_rates;
	sta->wcid.tx_info |= MT_WCID_TX_INFO_SET;

	return 0;
}

static void mt7663_usb_sdio_rate_work(struct work_struct *work)
{
	struct mt7615_wtbl_rate_desc *wrd, *wrd_next;
	struct list_head wrd_list;
	struct mt7615_dev *dev;

	dev = (struct mt7615_dev *)container_of(work, struct mt7615_dev,
						rate_work);

	INIT_LIST_HEAD(&wrd_list);
	spin_lock_bh(&dev->mt76.lock);
	list_splice_init(&dev->wrd_head, &wrd_list);
	spin_unlock_bh(&dev->mt76.lock);

	list_for_each_entry_safe(wrd, wrd_next, &wrd_list, node) {
		list_del(&wrd->node);

		mt7615_mutex_acquire(dev);
		mt7663_usb_sdio_set_rates(dev, wrd);
		mt7615_mutex_release(dev);

		kfree(wrd);
	}
}

bool mt7663_usb_sdio_tx_status_data(struct mt76_dev *mdev, u8 *update)
{
	struct mt7615_dev *dev = container_of(mdev, struct mt7615_dev, mt76);

	mt7615_mutex_acquire(dev);
	mt7615_mac_sta_poll(dev);
	mt7615_mutex_release(dev);

	return false;
}
EXPORT_SYMBOL_GPL(mt7663_usb_sdio_tx_status_data);

void mt7663_usb_sdio_tx_complete_skb(struct mt76_dev *mdev,
				     struct mt76_queue_entry *e)
{
	unsigned int headroom = MT_USB_TXD_SIZE;

	if (mt76_is_usb(mdev))
		headroom += MT_USB_HDR_SIZE;
	skb_pull(e->skb, headroom);

	mt76_tx_complete_skb(mdev, e->wcid, e->skb);
}
EXPORT_SYMBOL_GPL(mt7663_usb_sdio_tx_complete_skb);

int mt7663_usb_sdio_tx_prepare_skb(struct mt76_dev *mdev, void *txwi_ptr,
				   enum mt76_txq_id qid, struct mt76_wcid *wcid,
				   struct ieee80211_sta *sta,
				   struct mt76_tx_info *tx_info)
{
	struct mt7615_dev *dev = container_of(mdev, struct mt7615_dev, mt76);
	struct sk_buff *skb = tx_info->skb;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	struct ieee80211_key_conf *key = info->control.hw_key;
	struct mt7615_sta *msta;
	int pad, err, pktid;

	msta = wcid ? container_of(wcid, struct mt7615_sta, wcid) : NULL;
	if (!wcid)
		wcid = &dev->mt76.global_wcid;

	if ((info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) &&
	    msta && !msta->rate_probe) {
		/* request to configure sampling rate */
		spin_lock_bh(&dev->mt76.lock);
		mt7615_mac_set_rates(&dev->phy, msta, &info->control.rates[0],
				     msta->rates);
		spin_unlock_bh(&dev->mt76.lock);
	}

	pktid = mt76_tx_status_skb_add(&dev->mt76, wcid, skb);
	mt7663_usb_sdio_write_txwi(dev, wcid, qid, sta, key, pktid, skb);
	if (mt76_is_usb(mdev)) {
		u32 len = skb->len;

		put_unaligned_le32(len, skb_push(skb, sizeof(len)));
		pad = round_up(skb->len, 4) + 4 - skb->len;
	} else {
		pad = round_up(skb->len, 4) - skb->len;
	}

	err = mt76_skb_adjust_pad(skb, pad);
	if (err)
		/* Release pktid in case of error. */
		idr_remove(&wcid->pktid, pktid);

	return err;
}
EXPORT_SYMBOL_GPL(mt7663_usb_sdio_tx_prepare_skb);

static int mt7663u_dma_sched_init(struct mt7615_dev *dev)
{
	int i;

	mt76_rmw(dev, MT_DMA_SHDL(MT_DMASHDL_PKT_MAX_SIZE),
		 MT_DMASHDL_PKT_MAX_SIZE_PLE | MT_DMASHDL_PKT_MAX_SIZE_PSE,
		 FIELD_PREP(MT_DMASHDL_PKT_MAX_SIZE_PLE, 1) |
		 FIELD_PREP(MT_DMASHDL_PKT_MAX_SIZE_PSE, 8));

	/* disable refill group 5 - group 15 and raise group 2
	 * and 3 as high priority.
	 */
	mt76_wr(dev, MT_DMA_SHDL(MT_DMASHDL_REFILL), 0xffe00006);
	mt76_clear(dev, MT_DMA_SHDL(MT_DMASHDL_PAGE), BIT(16));

	for (i = 0; i < 5; i++)
		mt76_wr(dev, MT_DMA_SHDL(MT_DMASHDL_GROUP_QUOTA(i)),
			FIELD_PREP(MT_DMASHDL_GROUP_QUOTA_MIN, 0x3) |
			FIELD_PREP(MT_DMASHDL_GROUP_QUOTA_MAX, 0x1ff));

	mt76_wr(dev, MT_DMA_SHDL(MT_DMASHDL_Q_MAP(0)), 0x42104210);
	mt76_wr(dev, MT_DMA_SHDL(MT_DMASHDL_Q_MAP(1)), 0x42104210);

	mt76_wr(dev, MT_DMA_SHDL(MT_DMASHDL_Q_MAP(2)), 0x4444);

	/* group pririority from high to low:
	 * 15 (cmd groups) > 4 > 3 > 2 > 1 > 0.
	 */
	mt76_wr(dev, MT_DMA_SHDL(MT_DMASHDL_SCHED_SET0), 0x6501234f);
	mt76_wr(dev, MT_DMA_SHDL(MT_DMASHDL_SCHED_SET1), 0xedcba987);
	mt76_wr(dev, MT_DMA_SHDL(MT_DMASHDL_OPTIONAL), 0x7004801c);

	mt76_wr(dev, MT_UDMA_WLCFG_1,
		FIELD_PREP(MT_WL_TX_TMOUT_LMT, 80000) |
		FIELD_PREP(MT_WL_RX_AGG_PKT_LMT, 1));

	/* setup UDMA Rx Flush */
	mt76_clear(dev, MT_UDMA_WLCFG_0, MT_WL_RX_FLUSH);
	/* hif reset */
	mt76_set(dev, MT_HIF_RST, MT_HIF_LOGIC_RST_N);

	mt76_set(dev, MT_UDMA_WLCFG_0,
		 MT_WL_RX_AGG_EN | MT_WL_RX_EN | MT_WL_TX_EN |
		 MT_WL_RX_MPSZ_PAD0 | MT_TICK_1US_EN |
		 MT_WL_TX_TMOUT_FUNC_EN);
	mt76_rmw(dev, MT_UDMA_WLCFG_0, MT_WL_RX_AGG_LMT | MT_WL_RX_AGG_TO,
		 FIELD_PREP(MT_WL_RX_AGG_LMT, 32) |
		 FIELD_PREP(MT_WL_RX_AGG_TO, 100));

	return 0;
}

static int mt7663_usb_sdio_init_hardware(struct mt7615_dev *dev)
{
	int ret, idx;

	ret = mt7615_eeprom_init(dev, MT_EFUSE_BASE);
	if (ret < 0)
		return ret;

	if (mt76_is_usb(&dev->mt76)) {
		ret = mt7663u_dma_sched_init(dev);
		if (ret)
			return ret;
	}

	set_bit(MT76_STATE_INITIALIZED, &dev->mphy.state);

	/* Beacon and mgmt frames should occupy wcid 0 */
	idx = mt76_wcid_alloc(dev->mt76.wcid_mask, MT7615_WTBL_STA - 1);
	if (idx)
		return -ENOSPC;

	dev->mt76.global_wcid.idx = idx;
	dev->mt76.global_wcid.hw_key_idx = -1;
	rcu_assign_pointer(dev->mt76.wcid[idx], &dev->mt76.global_wcid);

	return 0;
}

int mt7663_usb_sdio_register_device(struct mt7615_dev *dev)
{
	struct ieee80211_hw *hw = mt76_hw(dev);
	int err;

	INIT_WORK(&dev->rate_work, mt7663_usb_sdio_rate_work);
	INIT_LIST_HEAD(&dev->wrd_head);
	mt7615_init_device(dev);

	err = mt7663_usb_sdio_init_hardware(dev);
	if (err)
		return err;

	hw->extra_tx_headroom += MT_USB_TXD_SIZE;
	if (mt76_is_usb(&dev->mt76)) {
		hw->extra_tx_headroom += MT_USB_HDR_SIZE;
		/* check hw sg support in order to enable AMSDU */
		if (dev->mt76.usb.sg_en)
			hw->max_tx_fragments = MT_HW_TXP_MAX_BUF_NUM;
		else
			hw->max_tx_fragments = 1;
	}

	err = mt76_register_device(&dev->mt76, true, mt76_rates,
				   ARRAY_SIZE(mt76_rates));
	if (err < 0)
		return err;

	if (!dev->mt76.usb.sg_en) {
		struct ieee80211_sta_vht_cap *vht_cap;

		/* decrease max A-MSDU size if SG is not supported */
		vht_cap = &dev->mphy.sband_5g.sband.vht_cap;
		vht_cap->cap &= ~IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_11454;
	}

	ieee80211_queue_work(hw, &dev->mcu_work);
	mt7615_init_txpower(dev, &dev->mphy.sband_2g.sband);
	mt7615_init_txpower(dev, &dev->mphy.sband_5g.sband);

#if defined(CONFIG_MT7615_DEBUGFS)
	return mt7615_init_debugfs(dev);
#else
	return 0;
#endif
}
EXPORT_SYMBOL_GPL(mt7663_usb_sdio_register_device);

MODULE_AUTHOR("Lorenzo Bianconi <[email protected]>");
MODULE_AUTHOR("Sean Wang <[email protected]>");
MODULE_DESCRIPTION("MediaTek MT7663 SDIO/USB helpers");
MODULE_LICENSE("Dual BSD/GPL");