Return-path: Received: from mail-pf0-f193.google.com ([209.85.192.193]:36026 "EHLO mail-pf0-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753697AbdFMOvq (ORCPT ); Tue, 13 Jun 2017 10:51:46 -0400 Received: by mail-pf0-f193.google.com with SMTP id y7so21957841pfd.3 for ; Tue, 13 Jun 2017 07:51:46 -0700 (PDT) From: Amitkumar Karwar To: Kalle Valo Cc: linux-wireless@vger.kernel.org, Alexey.Brodkin@synopsys.com, Amitkumar Karwar , Karun Eagalapati , Amitkumar Karwar Subject: [PATCH 05/20] rsi: card reset for USB interface Date: Tue, 13 Jun 2017 20:18:53 +0530 Message-Id: <1497365348-2305-6-git-send-email-amit.karwar@redpinesignals.com> (sfid-20170613_165149_642592_7C9C363D) In-Reply-To: <1497365348-2305-1-git-send-email-amit.karwar@redpinesignals.com> References: <1497365348-2305-1-git-send-email-amit.karwar@redpinesignals.com> Sender: linux-wireless-owner@vger.kernel.org List-ID: From: Karun Eagalapati We need to reset the chip in teardown path so that it can work next time when driver is loaded. This patch adds support for this reset configuration for USB. Signed-off-by: Karun Eagalapati Signed-off-by: Amitkumar Karwar --- drivers/net/wireless/rsi/rsi_91x_usb.c | 72 ++++++++++++++++++++++++++++++++++ drivers/net/wireless/rsi/rsi_usb.h | 1 + 2 files changed, 73 insertions(+) diff --git a/drivers/net/wireless/rsi/rsi_91x_usb.c b/drivers/net/wireless/rsi/rsi_91x_usb.c index bcd7f45..1d7bb9d 100644 --- a/drivers/net/wireless/rsi/rsi_91x_usb.c +++ b/drivers/net/wireless/rsi/rsi_91x_usb.c @@ -558,6 +558,77 @@ static int rsi_init_usb_interface(struct rsi_hw *adapter, return status; } +static int usb_ulp_read_write(struct rsi_hw *adapter, u16 addr, u32 data, + u16 len_in_bits) +{ + int ret; + + ret = rsi_usb_master_reg_write + (adapter, RSI_GSPI_DATA_REG1, + ((addr << 6) | ((data >> 16) & 0xffff)), 2); + if (ret < 0) + return ret; + + ret = rsi_usb_master_reg_write(adapter, RSI_GSPI_DATA_REG0, + (data & 0xffff), 2); + if (ret < 0) + return ret; + + /* Initializing GSPI for ULP read/writes */ + rsi_usb_master_reg_write(adapter, RSI_GSPI_CTRL_REG0, + RSI_GSPI_CTRL_REG0_VALUE, 2); + + ret = rsi_usb_master_reg_write(adapter, RSI_GSPI_CTRL_REG1, + ((len_in_bits - 1) | RSI_GSPI_TRIG), 2); + if (ret < 0) + return ret; + + msleep(20); + + return 0; +} + +static int rsi_reset_card(struct rsi_hw *adapter) +{ + int ret; + + rsi_dbg(INFO_ZONE, "Resetting Card...\n"); + rsi_usb_master_reg_write(adapter, RSI_TA_HOLD_REG, 0xE, 4); + + /* This msleep will ensure Thread-Arch processor to go to hold + * and any pending dma transfers to rf in device to finish. + */ + msleep(100); + + ret = usb_ulp_read_write(adapter, RSI_WATCH_DOG_TIMER_1, + RSI_ULP_WRITE_2, 32); + if (ret < 0) + goto fail; + ret = usb_ulp_read_write(adapter, RSI_WATCH_DOG_TIMER_2, + RSI_ULP_WRITE_0, 32); + if (ret < 0) + goto fail; + ret = usb_ulp_read_write(adapter, RSI_WATCH_DOG_DELAY_TIMER_1, + RSI_ULP_WRITE_50, 32); + if (ret < 0) + goto fail; + ret = usb_ulp_read_write(adapter, RSI_WATCH_DOG_DELAY_TIMER_2, + RSI_ULP_WRITE_0, 32); + if (ret < 0) + goto fail; + ret = usb_ulp_read_write(adapter, RSI_WATCH_DOG_TIMER_ENABLE, + RSI_ULP_TIMER_ENABLE, 32); + if (ret < 0) + goto fail; + + rsi_dbg(INFO_ZONE, "Reset card done\n"); + return ret; + +fail: + rsi_dbg(ERR_ZONE, "Reset card failed\n"); + return ret; +} + /** * rsi_probe() - This function is called by kernel when the driver provided * Vendor and device IDs are matched. All the initialization @@ -641,6 +712,7 @@ static void rsi_disconnect(struct usb_interface *pfunction) return; rsi_mac80211_detach(adapter); + rsi_reset_card(adapter); rsi_deinit_usb_interface(adapter); rsi_91x_deinit(adapter); diff --git a/drivers/net/wireless/rsi/rsi_usb.h b/drivers/net/wireless/rsi/rsi_usb.h index 59513ac..2c5c0e7 100644 --- a/drivers/net/wireless/rsi/rsi_usb.h +++ b/drivers/net/wireless/rsi/rsi_usb.h @@ -25,6 +25,7 @@ #define USB_INTERNAL_REG_1 0x25000 #define RSI_USB_READY_MAGIC_NUM 0xab #define FW_STATUS_REG 0x41050012 +#define RSI_TA_HOLD_REG 0x22000844 #define USB_VENDOR_REGISTER_READ 0x15 #define USB_VENDOR_REGISTER_WRITE 0x16 -- 2.7.4