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linuxdebug/drivers/net/wireless/mediatek/mt76/mt7921/usb_mac.c

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null pointer error
2024-07-16 15:50:57 +02:00
// SPDX-License-Identifier: ISC
/* Copyright (C) 2022 MediaTek Inc.
*
* Author: Lorenzo Bianconi <lorenzo@kernel.org>
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/usb.h>
#include "mt7921.h"
#include "mcu.h"
#include "mac.h"
static u32 mt7921u_uhw_rr(struct mt76_dev *dev, u32 addr)
{
u32 ret;
mutex_lock(&dev->usb.usb_ctrl_mtx);
ret = ___mt76u_rr(dev, MT_VEND_DEV_MODE,
USB_DIR_IN | MT_USB_TYPE_UHW_VENDOR, addr);
mutex_unlock(&dev->usb.usb_ctrl_mtx);
return ret;
}
static void mt7921u_uhw_wr(struct mt76_dev *dev, u32 addr, u32 val)
{
mutex_lock(&dev->usb.usb_ctrl_mtx);
___mt76u_wr(dev, MT_VEND_WRITE,
USB_DIR_OUT | MT_USB_TYPE_UHW_VENDOR, addr, val);
mutex_unlock(&dev->usb.usb_ctrl_mtx);
}
static void mt7921u_dma_prefetch(struct mt7921_dev *dev)
{
mt76_rmw(dev, MT_UWFDMA0_TX_RING_EXT_CTRL(0),
MT_WPDMA0_MAX_CNT_MASK, 4);
mt76_rmw(dev, MT_UWFDMA0_TX_RING_EXT_CTRL(0),
MT_WPDMA0_BASE_PTR_MASK, 0x80);
mt76_rmw(dev, MT_UWFDMA0_TX_RING_EXT_CTRL(1),
MT_WPDMA0_MAX_CNT_MASK, 4);
mt76_rmw(dev, MT_UWFDMA0_TX_RING_EXT_CTRL(1),
MT_WPDMA0_BASE_PTR_MASK, 0xc0);
mt76_rmw(dev, MT_UWFDMA0_TX_RING_EXT_CTRL(2),
MT_WPDMA0_MAX_CNT_MASK, 4);
mt76_rmw(dev, MT_UWFDMA0_TX_RING_EXT_CTRL(2),
MT_WPDMA0_BASE_PTR_MASK, 0x100);
mt76_rmw(dev, MT_UWFDMA0_TX_RING_EXT_CTRL(3),
MT_WPDMA0_MAX_CNT_MASK, 4);
mt76_rmw(dev, MT_UWFDMA0_TX_RING_EXT_CTRL(3),
MT_WPDMA0_BASE_PTR_MASK, 0x140);
mt76_rmw(dev, MT_UWFDMA0_TX_RING_EXT_CTRL(4),
MT_WPDMA0_MAX_CNT_MASK, 4);
mt76_rmw(dev, MT_UWFDMA0_TX_RING_EXT_CTRL(4),
MT_WPDMA0_BASE_PTR_MASK, 0x180);
mt76_rmw(dev, MT_UWFDMA0_TX_RING_EXT_CTRL(16),
MT_WPDMA0_MAX_CNT_MASK, 4);
mt76_rmw(dev, MT_UWFDMA0_TX_RING_EXT_CTRL(16),
MT_WPDMA0_BASE_PTR_MASK, 0x280);
mt76_rmw(dev, MT_UWFDMA0_TX_RING_EXT_CTRL(17),
MT_WPDMA0_MAX_CNT_MASK, 4);
mt76_rmw(dev, MT_UWFDMA0_TX_RING_EXT_CTRL(17),
MT_WPDMA0_BASE_PTR_MASK, 0x2c0);
}
static void mt7921u_wfdma_init(struct mt7921_dev *dev)
{
mt7921u_dma_prefetch(dev);
mt76_clear(dev, MT_UWFDMA0_GLO_CFG, MT_WFDMA0_GLO_CFG_OMIT_RX_INFO);
mt76_set(dev, MT_UWFDMA0_GLO_CFG,
MT_WFDMA0_GLO_CFG_OMIT_TX_INFO |
MT_WFDMA0_GLO_CFG_OMIT_RX_INFO_PFET2 |
MT_WFDMA0_GLO_CFG_FW_DWLD_BYPASS_DMASHDL |
MT_WFDMA0_GLO_CFG_TX_DMA_EN |
MT_WFDMA0_GLO_CFG_RX_DMA_EN);
/* disable dmashdl */
mt76_clear(dev, MT_UWFDMA0_GLO_CFG_EXT0,
MT_WFDMA0_CSR_TX_DMASHDL_ENABLE);
mt76_set(dev, MT_DMASHDL_SW_CONTROL, MT_DMASHDL_DMASHDL_BYPASS);
mt76_set(dev, MT_WFDMA_DUMMY_CR, MT_WFDMA_NEED_REINIT);
}
static int mt7921u_dma_rx_evt_ep4(struct mt7921_dev *dev)
{
if (!mt76_poll(dev, MT_UWFDMA0_GLO_CFG,
MT_WFDMA0_GLO_CFG_RX_DMA_BUSY, 0, 1000))
return -ETIMEDOUT;
mt76_clear(dev, MT_UWFDMA0_GLO_CFG, MT_WFDMA0_GLO_CFG_RX_DMA_EN);
mt76_set(dev, MT_WFDMA_HOST_CONFIG,
MT_WFDMA_HOST_CONFIG_USB_RXEVT_EP4_EN);
mt76_set(dev, MT_UWFDMA0_GLO_CFG, MT_WFDMA0_GLO_CFG_RX_DMA_EN);
return 0;
}
static void mt7921u_epctl_rst_opt(struct mt7921_dev *dev, bool reset)
{
u32 val;
/* usb endpoint reset opt
* bits[4,9]: out blk ep 4-9
* bits[20,21]: in blk ep 4-5
* bits[22]: in int ep 6
*/
val = mt7921u_uhw_rr(&dev->mt76, MT_SSUSB_EPCTL_CSR_EP_RST_OPT);
if (reset)
val |= GENMASK(9, 4) | GENMASK(22, 20);
else
val &= ~(GENMASK(9, 4) | GENMASK(22, 20));
mt7921u_uhw_wr(&dev->mt76, MT_SSUSB_EPCTL_CSR_EP_RST_OPT, val);
}
int mt7921u_dma_init(struct mt7921_dev *dev, bool resume)
{
int err;
mt7921u_wfdma_init(dev);
mt76_clear(dev, MT_UDMA_WLCFG_0, MT_WL_RX_FLUSH);
mt76_set(dev, MT_UDMA_WLCFG_0,
MT_WL_RX_EN | MT_WL_TX_EN |
MT_WL_RX_MPSZ_PAD0 | MT_TICK_1US_EN);
mt76_clear(dev, MT_UDMA_WLCFG_0,
MT_WL_RX_AGG_TO | MT_WL_RX_AGG_LMT);
mt76_clear(dev, MT_UDMA_WLCFG_1, MT_WL_RX_AGG_PKT_LMT);
if (resume)
return 0;
err = mt7921u_dma_rx_evt_ep4(dev);
if (err)
return err;
mt7921u_epctl_rst_opt(dev, false);
return 0;
}
int mt7921u_wfsys_reset(struct mt7921_dev *dev)
{
u32 val;
int i;
mt7921u_epctl_rst_opt(dev, false);
val = mt7921u_uhw_rr(&dev->mt76, MT_CBTOP_RGU_WF_SUBSYS_RST);
val |= MT_CBTOP_RGU_WF_SUBSYS_RST_WF_WHOLE_PATH;
mt7921u_uhw_wr(&dev->mt76, MT_CBTOP_RGU_WF_SUBSYS_RST, val);
usleep_range(10, 20);
val = mt7921u_uhw_rr(&dev->mt76, MT_CBTOP_RGU_WF_SUBSYS_RST);
val &= ~MT_CBTOP_RGU_WF_SUBSYS_RST_WF_WHOLE_PATH;
mt7921u_uhw_wr(&dev->mt76, MT_CBTOP_RGU_WF_SUBSYS_RST, val);
mt7921u_uhw_wr(&dev->mt76, MT_UDMA_CONN_INFRA_STATUS_SEL, 0);
for (i = 0; i < MT7921_WFSYS_INIT_RETRY_COUNT; i++) {
val = mt7921u_uhw_rr(&dev->mt76, MT_UDMA_CONN_INFRA_STATUS);
if (val & MT_UDMA_CONN_WFSYS_INIT_DONE)
break;
msleep(100);
}
if (i == MT7921_WFSYS_INIT_RETRY_COUNT)
return -ETIMEDOUT;
return 0;
}
int mt7921u_init_reset(struct mt7921_dev *dev)
{
set_bit(MT76_RESET, &dev->mphy.state);
wake_up(&dev->mt76.mcu.wait);
skb_queue_purge(&dev->mt76.mcu.res_q);
mt76u_stop_rx(&dev->mt76);
mt76u_stop_tx(&dev->mt76);
mt7921u_wfsys_reset(dev);
clear_bit(MT76_RESET, &dev->mphy.state);
return mt76u_resume_rx(&dev->mt76);
}
int mt7921u_mac_reset(struct mt7921_dev *dev)
{
int err;
mt76_txq_schedule_all(&dev->mphy);
mt76_worker_disable(&dev->mt76.tx_worker);
set_bit(MT76_RESET, &dev->mphy.state);
set_bit(MT76_MCU_RESET, &dev->mphy.state);
wake_up(&dev->mt76.mcu.wait);
skb_queue_purge(&dev->mt76.mcu.res_q);
mt76u_stop_rx(&dev->mt76);
mt76u_stop_tx(&dev->mt76);
mt7921u_wfsys_reset(dev);
clear_bit(MT76_MCU_RESET, &dev->mphy.state);
err = mt76u_resume_rx(&dev->mt76);
if (err)
goto out;
err = mt7921u_mcu_power_on(dev);
if (err)
goto out;
err = mt7921u_dma_init(dev, false);
if (err)
goto out;
mt76_wr(dev, MT_SWDEF_MODE, MT_SWDEF_NORMAL_MODE);
mt76_set(dev, MT_UDMA_TX_QSEL, MT_FW_DL_EN);
err = mt7921_run_firmware(dev);
if (err)
goto out;
mt76_clear(dev, MT_UDMA_TX_QSEL, MT_FW_DL_EN);
err = mt7921_mcu_set_eeprom(dev);
if (err)
goto out;
err = mt7921_mac_init(dev);
if (err)
goto out;
err = __mt7921_start(&dev->phy);
out:
clear_bit(MT76_RESET, &dev->mphy.state);
mt76_worker_enable(&dev->mt76.tx_worker);
return err;
}