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1039 lines
25 KiB
1039 lines
25 KiB
/* |
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* Copyright (c) 2011, 2012, Qualcomm Atheros Communications Inc. |
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* Copyright (c) 2014, I2SE GmbH |
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* |
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* Permission to use, copy, modify, and/or distribute this software |
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* for any purpose with or without fee is hereby granted, provided |
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* that the above copyright notice and this permission notice appear |
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* in all copies. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL |
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* WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED |
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* WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL |
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* THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR |
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM |
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* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, |
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* NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN |
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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*/ |
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|
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/* This module implements the Qualcomm Atheros SPI protocol for |
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* kernel-based SPI device; it is essentially an Ethernet-to-SPI |
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* serial converter; |
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*/ |
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#include <linux/errno.h> |
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#include <linux/etherdevice.h> |
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#include <linux/if_arp.h> |
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#include <linux/if_ether.h> |
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#include <linux/init.h> |
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#include <linux/interrupt.h> |
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#include <linux/jiffies.h> |
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#include <linux/kernel.h> |
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#include <linux/kthread.h> |
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#include <linux/module.h> |
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#include <linux/moduleparam.h> |
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#include <linux/netdevice.h> |
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#include <linux/of.h> |
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#include <linux/of_device.h> |
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#include <linux/of_net.h> |
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#include <linux/sched.h> |
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#include <linux/skbuff.h> |
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#include <linux/spi/spi.h> |
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#include <linux/types.h> |
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#include "qca_7k.h" |
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#include "qca_7k_common.h" |
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#include "qca_debug.h" |
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#include "qca_spi.h" |
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|
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#define MAX_DMA_BURST_LEN 5000 |
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/* Modules parameters */ |
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#define QCASPI_CLK_SPEED_MIN 1000000 |
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#define QCASPI_CLK_SPEED_MAX 16000000 |
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#define QCASPI_CLK_SPEED 8000000 |
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static int qcaspi_clkspeed; |
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module_param(qcaspi_clkspeed, int, 0); |
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MODULE_PARM_DESC(qcaspi_clkspeed, "SPI bus clock speed (Hz). Use 1000000-16000000."); |
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#define QCASPI_BURST_LEN_MIN 1 |
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#define QCASPI_BURST_LEN_MAX MAX_DMA_BURST_LEN |
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static int qcaspi_burst_len = MAX_DMA_BURST_LEN; |
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module_param(qcaspi_burst_len, int, 0); |
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MODULE_PARM_DESC(qcaspi_burst_len, "Number of data bytes per burst. Use 1-5000."); |
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#define QCASPI_PLUGGABLE_MIN 0 |
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#define QCASPI_PLUGGABLE_MAX 1 |
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static int qcaspi_pluggable = QCASPI_PLUGGABLE_MIN; |
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module_param(qcaspi_pluggable, int, 0); |
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MODULE_PARM_DESC(qcaspi_pluggable, "Pluggable SPI connection (yes/no)."); |
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#define QCASPI_WRITE_VERIFY_MIN 0 |
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#define QCASPI_WRITE_VERIFY_MAX 3 |
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static int wr_verify = QCASPI_WRITE_VERIFY_MIN; |
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module_param(wr_verify, int, 0); |
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MODULE_PARM_DESC(wr_verify, "SPI register write verify trails. Use 0-3."); |
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#define QCASPI_TX_TIMEOUT (1 * HZ) |
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#define QCASPI_QCA7K_REBOOT_TIME_MS 1000 |
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static void |
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start_spi_intr_handling(struct qcaspi *qca, u16 *intr_cause) |
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{ |
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*intr_cause = 0; |
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qcaspi_write_register(qca, SPI_REG_INTR_ENABLE, 0, wr_verify); |
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qcaspi_read_register(qca, SPI_REG_INTR_CAUSE, intr_cause); |
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netdev_dbg(qca->net_dev, "interrupts: 0x%04x\n", *intr_cause); |
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} |
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static void |
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end_spi_intr_handling(struct qcaspi *qca, u16 intr_cause) |
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{ |
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u16 intr_enable = (SPI_INT_CPU_ON | |
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SPI_INT_PKT_AVLBL | |
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SPI_INT_RDBUF_ERR | |
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SPI_INT_WRBUF_ERR); |
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qcaspi_write_register(qca, SPI_REG_INTR_CAUSE, intr_cause, 0); |
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qcaspi_write_register(qca, SPI_REG_INTR_ENABLE, intr_enable, wr_verify); |
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netdev_dbg(qca->net_dev, "acking int: 0x%04x\n", intr_cause); |
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} |
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static u32 |
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qcaspi_write_burst(struct qcaspi *qca, u8 *src, u32 len) |
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{ |
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__be16 cmd; |
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struct spi_message msg; |
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struct spi_transfer transfer[2]; |
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int ret; |
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memset(&transfer, 0, sizeof(transfer)); |
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spi_message_init(&msg); |
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cmd = cpu_to_be16(QCA7K_SPI_WRITE | QCA7K_SPI_EXTERNAL); |
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transfer[0].tx_buf = &cmd; |
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transfer[0].len = QCASPI_CMD_LEN; |
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transfer[1].tx_buf = src; |
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transfer[1].len = len; |
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spi_message_add_tail(&transfer[0], &msg); |
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spi_message_add_tail(&transfer[1], &msg); |
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ret = spi_sync(qca->spi_dev, &msg); |
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if (ret || (msg.actual_length != QCASPI_CMD_LEN + len)) { |
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qcaspi_spi_error(qca); |
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return 0; |
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} |
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return len; |
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} |
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static u32 |
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qcaspi_write_legacy(struct qcaspi *qca, u8 *src, u32 len) |
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{ |
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struct spi_message msg; |
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struct spi_transfer transfer; |
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int ret; |
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memset(&transfer, 0, sizeof(transfer)); |
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spi_message_init(&msg); |
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transfer.tx_buf = src; |
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transfer.len = len; |
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spi_message_add_tail(&transfer, &msg); |
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ret = spi_sync(qca->spi_dev, &msg); |
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if (ret || (msg.actual_length != len)) { |
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qcaspi_spi_error(qca); |
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return 0; |
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} |
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return len; |
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} |
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static u32 |
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qcaspi_read_burst(struct qcaspi *qca, u8 *dst, u32 len) |
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{ |
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struct spi_message msg; |
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__be16 cmd; |
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struct spi_transfer transfer[2]; |
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int ret; |
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memset(&transfer, 0, sizeof(transfer)); |
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spi_message_init(&msg); |
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cmd = cpu_to_be16(QCA7K_SPI_READ | QCA7K_SPI_EXTERNAL); |
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transfer[0].tx_buf = &cmd; |
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transfer[0].len = QCASPI_CMD_LEN; |
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transfer[1].rx_buf = dst; |
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transfer[1].len = len; |
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spi_message_add_tail(&transfer[0], &msg); |
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spi_message_add_tail(&transfer[1], &msg); |
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ret = spi_sync(qca->spi_dev, &msg); |
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if (ret || (msg.actual_length != QCASPI_CMD_LEN + len)) { |
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qcaspi_spi_error(qca); |
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return 0; |
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} |
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return len; |
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} |
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static u32 |
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qcaspi_read_legacy(struct qcaspi *qca, u8 *dst, u32 len) |
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{ |
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struct spi_message msg; |
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struct spi_transfer transfer; |
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int ret; |
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memset(&transfer, 0, sizeof(transfer)); |
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spi_message_init(&msg); |
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transfer.rx_buf = dst; |
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transfer.len = len; |
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spi_message_add_tail(&transfer, &msg); |
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ret = spi_sync(qca->spi_dev, &msg); |
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if (ret || (msg.actual_length != len)) { |
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qcaspi_spi_error(qca); |
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return 0; |
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} |
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return len; |
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} |
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static int |
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qcaspi_tx_cmd(struct qcaspi *qca, u16 cmd) |
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{ |
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__be16 tx_data; |
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struct spi_message msg; |
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struct spi_transfer transfer; |
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int ret; |
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memset(&transfer, 0, sizeof(transfer)); |
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spi_message_init(&msg); |
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tx_data = cpu_to_be16(cmd); |
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transfer.len = sizeof(cmd); |
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transfer.tx_buf = &tx_data; |
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spi_message_add_tail(&transfer, &msg); |
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ret = spi_sync(qca->spi_dev, &msg); |
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if (!ret) |
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ret = msg.status; |
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if (ret) |
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qcaspi_spi_error(qca); |
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return ret; |
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} |
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static int |
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qcaspi_tx_frame(struct qcaspi *qca, struct sk_buff *skb) |
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{ |
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u32 count; |
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u32 written; |
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u32 offset; |
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u32 len; |
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len = skb->len; |
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qcaspi_write_register(qca, SPI_REG_BFR_SIZE, len, wr_verify); |
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if (qca->legacy_mode) |
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qcaspi_tx_cmd(qca, QCA7K_SPI_WRITE | QCA7K_SPI_EXTERNAL); |
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offset = 0; |
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while (len) { |
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count = len; |
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if (count > qca->burst_len) |
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count = qca->burst_len; |
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if (qca->legacy_mode) { |
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written = qcaspi_write_legacy(qca, |
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skb->data + offset, |
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count); |
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} else { |
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written = qcaspi_write_burst(qca, |
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skb->data + offset, |
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count); |
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} |
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if (written != count) |
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return -1; |
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offset += count; |
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len -= count; |
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} |
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return 0; |
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} |
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static int |
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qcaspi_transmit(struct qcaspi *qca) |
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{ |
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struct net_device_stats *n_stats = &qca->net_dev->stats; |
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u16 available = 0; |
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u32 pkt_len; |
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u16 new_head; |
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u16 packets = 0; |
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if (qca->txr.skb[qca->txr.head] == NULL) |
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return 0; |
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qcaspi_read_register(qca, SPI_REG_WRBUF_SPC_AVA, &available); |
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if (available > QCASPI_HW_BUF_LEN) { |
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/* This could only happen by interferences on the SPI line. |
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* So retry later ... |
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*/ |
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qca->stats.buf_avail_err++; |
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return -1; |
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} |
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while (qca->txr.skb[qca->txr.head]) { |
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pkt_len = qca->txr.skb[qca->txr.head]->len + QCASPI_HW_PKT_LEN; |
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if (available < pkt_len) { |
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if (packets == 0) |
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qca->stats.write_buf_miss++; |
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break; |
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} |
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if (qcaspi_tx_frame(qca, qca->txr.skb[qca->txr.head]) == -1) { |
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qca->stats.write_err++; |
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return -1; |
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} |
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packets++; |
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n_stats->tx_packets++; |
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n_stats->tx_bytes += qca->txr.skb[qca->txr.head]->len; |
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available -= pkt_len; |
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/* remove the skb from the queue */ |
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/* XXX After inconsistent lock states netif_tx_lock() |
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* has been replaced by netif_tx_lock_bh() and so on. |
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*/ |
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netif_tx_lock_bh(qca->net_dev); |
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dev_kfree_skb(qca->txr.skb[qca->txr.head]); |
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qca->txr.skb[qca->txr.head] = NULL; |
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qca->txr.size -= pkt_len; |
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new_head = qca->txr.head + 1; |
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if (new_head >= qca->txr.count) |
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new_head = 0; |
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qca->txr.head = new_head; |
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if (netif_queue_stopped(qca->net_dev)) |
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netif_wake_queue(qca->net_dev); |
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netif_tx_unlock_bh(qca->net_dev); |
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} |
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return 0; |
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} |
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static int |
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qcaspi_receive(struct qcaspi *qca) |
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{ |
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struct net_device *net_dev = qca->net_dev; |
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struct net_device_stats *n_stats = &net_dev->stats; |
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u16 available = 0; |
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u32 bytes_read; |
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u8 *cp; |
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/* Allocate rx SKB if we don't have one available. */ |
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if (!qca->rx_skb) { |
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qca->rx_skb = netdev_alloc_skb_ip_align(net_dev, |
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net_dev->mtu + |
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VLAN_ETH_HLEN); |
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if (!qca->rx_skb) { |
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netdev_dbg(net_dev, "out of RX resources\n"); |
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qca->stats.out_of_mem++; |
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return -1; |
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} |
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} |
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/* Read the packet size. */ |
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qcaspi_read_register(qca, SPI_REG_RDBUF_BYTE_AVA, &available); |
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netdev_dbg(net_dev, "qcaspi_receive: SPI_REG_RDBUF_BYTE_AVA: Value: %08x\n", |
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available); |
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if (available > QCASPI_HW_BUF_LEN + QCASPI_HW_PKT_LEN) { |
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/* This could only happen by interferences on the SPI line. |
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* So retry later ... |
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*/ |
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qca->stats.buf_avail_err++; |
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return -1; |
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} else if (available == 0) { |
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netdev_dbg(net_dev, "qcaspi_receive called without any data being available!\n"); |
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return -1; |
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} |
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qcaspi_write_register(qca, SPI_REG_BFR_SIZE, available, wr_verify); |
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if (qca->legacy_mode) |
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qcaspi_tx_cmd(qca, QCA7K_SPI_READ | QCA7K_SPI_EXTERNAL); |
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while (available) { |
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u32 count = available; |
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if (count > qca->burst_len) |
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count = qca->burst_len; |
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if (qca->legacy_mode) { |
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bytes_read = qcaspi_read_legacy(qca, qca->rx_buffer, |
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count); |
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} else { |
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bytes_read = qcaspi_read_burst(qca, qca->rx_buffer, |
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count); |
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} |
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netdev_dbg(net_dev, "available: %d, byte read: %d\n", |
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available, bytes_read); |
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if (bytes_read) { |
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available -= bytes_read; |
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} else { |
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qca->stats.read_err++; |
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return -1; |
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} |
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cp = qca->rx_buffer; |
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while ((bytes_read--) && (qca->rx_skb)) { |
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s32 retcode; |
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retcode = qcafrm_fsm_decode(&qca->frm_handle, |
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qca->rx_skb->data, |
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skb_tailroom(qca->rx_skb), |
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*cp); |
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cp++; |
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switch (retcode) { |
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case QCAFRM_GATHER: |
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case QCAFRM_NOHEAD: |
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break; |
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case QCAFRM_NOTAIL: |
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netdev_dbg(net_dev, "no RX tail\n"); |
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n_stats->rx_errors++; |
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n_stats->rx_dropped++; |
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break; |
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case QCAFRM_INVLEN: |
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netdev_dbg(net_dev, "invalid RX length\n"); |
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n_stats->rx_errors++; |
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n_stats->rx_dropped++; |
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break; |
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default: |
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qca->rx_skb->dev = qca->net_dev; |
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n_stats->rx_packets++; |
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n_stats->rx_bytes += retcode; |
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skb_put(qca->rx_skb, retcode); |
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qca->rx_skb->protocol = eth_type_trans( |
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qca->rx_skb, qca->rx_skb->dev); |
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skb_checksum_none_assert(qca->rx_skb); |
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netif_rx_ni(qca->rx_skb); |
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qca->rx_skb = netdev_alloc_skb_ip_align(net_dev, |
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net_dev->mtu + VLAN_ETH_HLEN); |
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if (!qca->rx_skb) { |
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netdev_dbg(net_dev, "out of RX resources\n"); |
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n_stats->rx_errors++; |
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qca->stats.out_of_mem++; |
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break; |
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} |
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} |
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} |
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} |
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return 0; |
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} |
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|
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/* Check that tx ring stores only so much bytes |
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* that fit into the internal QCA buffer. |
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*/ |
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static int |
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qcaspi_tx_ring_has_space(struct tx_ring *txr) |
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{ |
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if (txr->skb[txr->tail]) |
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return 0; |
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return (txr->size + QCAFRM_MAX_LEN < QCASPI_HW_BUF_LEN) ? 1 : 0; |
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} |
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/* Flush the tx ring. This function is only safe to |
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* call from the qcaspi_spi_thread. |
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*/ |
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|
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static void |
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qcaspi_flush_tx_ring(struct qcaspi *qca) |
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{ |
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int i; |
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|
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/* XXX After inconsistent lock states netif_tx_lock() |
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* has been replaced by netif_tx_lock_bh() and so on. |
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*/ |
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netif_tx_lock_bh(qca->net_dev); |
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for (i = 0; i < TX_RING_MAX_LEN; i++) { |
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if (qca->txr.skb[i]) { |
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dev_kfree_skb(qca->txr.skb[i]); |
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qca->txr.skb[i] = NULL; |
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qca->net_dev->stats.tx_dropped++; |
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} |
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} |
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qca->txr.tail = 0; |
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qca->txr.head = 0; |
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qca->txr.size = 0; |
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netif_tx_unlock_bh(qca->net_dev); |
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} |
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static void |
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qcaspi_qca7k_sync(struct qcaspi *qca, int event) |
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{ |
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u16 signature = 0; |
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u16 spi_config; |
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u16 wrbuf_space = 0; |
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|
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if (event == QCASPI_EVENT_CPUON) { |
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/* Read signature twice, if not valid |
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* go back to unknown state. |
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*/ |
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qcaspi_read_register(qca, SPI_REG_SIGNATURE, &signature); |
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qcaspi_read_register(qca, SPI_REG_SIGNATURE, &signature); |
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if (signature != QCASPI_GOOD_SIGNATURE) { |
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if (qca->sync == QCASPI_SYNC_READY) |
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qca->stats.bad_signature++; |
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|
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qca->sync = QCASPI_SYNC_UNKNOWN; |
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netdev_dbg(qca->net_dev, "sync: got CPU on, but signature was invalid, restart\n"); |
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return; |
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} else { |
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/* ensure that the WRBUF is empty */ |
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qcaspi_read_register(qca, SPI_REG_WRBUF_SPC_AVA, |
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&wrbuf_space); |
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if (wrbuf_space != QCASPI_HW_BUF_LEN) { |
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netdev_dbg(qca->net_dev, "sync: got CPU on, but wrbuf not empty. reset!\n"); |
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qca->sync = QCASPI_SYNC_UNKNOWN; |
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} else { |
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netdev_dbg(qca->net_dev, "sync: got CPU on, now in sync\n"); |
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qca->sync = QCASPI_SYNC_READY; |
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return; |
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} |
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} |
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} |
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|
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switch (qca->sync) { |
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case QCASPI_SYNC_READY: |
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/* Check signature twice, if not valid go to unknown state. */ |
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qcaspi_read_register(qca, SPI_REG_SIGNATURE, &signature); |
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if (signature != QCASPI_GOOD_SIGNATURE) |
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qcaspi_read_register(qca, SPI_REG_SIGNATURE, &signature); |
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|
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if (signature != QCASPI_GOOD_SIGNATURE) { |
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qca->sync = QCASPI_SYNC_UNKNOWN; |
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qca->stats.bad_signature++; |
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netdev_dbg(qca->net_dev, "sync: bad signature, restart\n"); |
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/* don't reset right away */ |
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return; |
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} |
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break; |
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case QCASPI_SYNC_UNKNOWN: |
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/* Read signature, if not valid stay in unknown state */ |
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qcaspi_read_register(qca, SPI_REG_SIGNATURE, &signature); |
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if (signature != QCASPI_GOOD_SIGNATURE) { |
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netdev_dbg(qca->net_dev, "sync: could not read signature to reset device, retry.\n"); |
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return; |
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} |
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|
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/* TODO: use GPIO to reset QCA7000 in legacy mode*/ |
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netdev_dbg(qca->net_dev, "sync: resetting device.\n"); |
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qcaspi_read_register(qca, SPI_REG_SPI_CONFIG, &spi_config); |
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spi_config |= QCASPI_SLAVE_RESET_BIT; |
|
qcaspi_write_register(qca, SPI_REG_SPI_CONFIG, spi_config, 0); |
|
|
|
qca->sync = QCASPI_SYNC_RESET; |
|
qca->stats.trig_reset++; |
|
qca->reset_count = 0; |
|
break; |
|
case QCASPI_SYNC_RESET: |
|
qca->reset_count++; |
|
netdev_dbg(qca->net_dev, "sync: waiting for CPU on, count %u.\n", |
|
qca->reset_count); |
|
if (qca->reset_count >= QCASPI_RESET_TIMEOUT) { |
|
/* reset did not seem to take place, try again */ |
|
qca->sync = QCASPI_SYNC_UNKNOWN; |
|
qca->stats.reset_timeout++; |
|
netdev_dbg(qca->net_dev, "sync: reset timeout, restarting process.\n"); |
|
} |
|
break; |
|
} |
|
} |
|
|
|
static int |
|
qcaspi_spi_thread(void *data) |
|
{ |
|
struct qcaspi *qca = data; |
|
u16 intr_cause = 0; |
|
|
|
netdev_info(qca->net_dev, "SPI thread created\n"); |
|
while (!kthread_should_stop()) { |
|
set_current_state(TASK_INTERRUPTIBLE); |
|
if ((qca->intr_req == qca->intr_svc) && |
|
(qca->txr.skb[qca->txr.head] == NULL) && |
|
(qca->sync == QCASPI_SYNC_READY)) |
|
schedule(); |
|
|
|
set_current_state(TASK_RUNNING); |
|
|
|
netdev_dbg(qca->net_dev, "have work to do. int: %d, tx_skb: %p\n", |
|
qca->intr_req - qca->intr_svc, |
|
qca->txr.skb[qca->txr.head]); |
|
|
|
qcaspi_qca7k_sync(qca, QCASPI_EVENT_UPDATE); |
|
|
|
if (qca->sync != QCASPI_SYNC_READY) { |
|
netdev_dbg(qca->net_dev, "sync: not ready %u, turn off carrier and flush\n", |
|
(unsigned int)qca->sync); |
|
netif_stop_queue(qca->net_dev); |
|
netif_carrier_off(qca->net_dev); |
|
qcaspi_flush_tx_ring(qca); |
|
msleep(QCASPI_QCA7K_REBOOT_TIME_MS); |
|
} |
|
|
|
if (qca->intr_svc != qca->intr_req) { |
|
qca->intr_svc = qca->intr_req; |
|
start_spi_intr_handling(qca, &intr_cause); |
|
|
|
if (intr_cause & SPI_INT_CPU_ON) { |
|
qcaspi_qca7k_sync(qca, QCASPI_EVENT_CPUON); |
|
|
|
/* not synced. */ |
|
if (qca->sync != QCASPI_SYNC_READY) |
|
continue; |
|
|
|
qca->stats.device_reset++; |
|
netif_wake_queue(qca->net_dev); |
|
netif_carrier_on(qca->net_dev); |
|
} |
|
|
|
if (intr_cause & SPI_INT_RDBUF_ERR) { |
|
/* restart sync */ |
|
netdev_dbg(qca->net_dev, "===> rdbuf error!\n"); |
|
qca->stats.read_buf_err++; |
|
qca->sync = QCASPI_SYNC_UNKNOWN; |
|
continue; |
|
} |
|
|
|
if (intr_cause & SPI_INT_WRBUF_ERR) { |
|
/* restart sync */ |
|
netdev_dbg(qca->net_dev, "===> wrbuf error!\n"); |
|
qca->stats.write_buf_err++; |
|
qca->sync = QCASPI_SYNC_UNKNOWN; |
|
continue; |
|
} |
|
|
|
/* can only handle other interrupts |
|
* if sync has occurred |
|
*/ |
|
if (qca->sync == QCASPI_SYNC_READY) { |
|
if (intr_cause & SPI_INT_PKT_AVLBL) |
|
qcaspi_receive(qca); |
|
} |
|
|
|
end_spi_intr_handling(qca, intr_cause); |
|
} |
|
|
|
if (qca->sync == QCASPI_SYNC_READY) |
|
qcaspi_transmit(qca); |
|
} |
|
set_current_state(TASK_RUNNING); |
|
netdev_info(qca->net_dev, "SPI thread exit\n"); |
|
|
|
return 0; |
|
} |
|
|
|
static irqreturn_t |
|
qcaspi_intr_handler(int irq, void *data) |
|
{ |
|
struct qcaspi *qca = data; |
|
|
|
qca->intr_req++; |
|
if (qca->spi_thread) |
|
wake_up_process(qca->spi_thread); |
|
|
|
return IRQ_HANDLED; |
|
} |
|
|
|
static int |
|
qcaspi_netdev_open(struct net_device *dev) |
|
{ |
|
struct qcaspi *qca = netdev_priv(dev); |
|
int ret = 0; |
|
|
|
if (!qca) |
|
return -EINVAL; |
|
|
|
qca->intr_req = 1; |
|
qca->intr_svc = 0; |
|
qca->sync = QCASPI_SYNC_UNKNOWN; |
|
qcafrm_fsm_init_spi(&qca->frm_handle); |
|
|
|
qca->spi_thread = kthread_run((void *)qcaspi_spi_thread, |
|
qca, "%s", dev->name); |
|
|
|
if (IS_ERR(qca->spi_thread)) { |
|
netdev_err(dev, "%s: unable to start kernel thread.\n", |
|
QCASPI_DRV_NAME); |
|
return PTR_ERR(qca->spi_thread); |
|
} |
|
|
|
ret = request_irq(qca->spi_dev->irq, qcaspi_intr_handler, 0, |
|
dev->name, qca); |
|
if (ret) { |
|
netdev_err(dev, "%s: unable to get IRQ %d (irqval=%d).\n", |
|
QCASPI_DRV_NAME, qca->spi_dev->irq, ret); |
|
kthread_stop(qca->spi_thread); |
|
return ret; |
|
} |
|
|
|
/* SPI thread takes care of TX queue */ |
|
|
|
return 0; |
|
} |
|
|
|
static int |
|
qcaspi_netdev_close(struct net_device *dev) |
|
{ |
|
struct qcaspi *qca = netdev_priv(dev); |
|
|
|
netif_stop_queue(dev); |
|
|
|
qcaspi_write_register(qca, SPI_REG_INTR_ENABLE, 0, wr_verify); |
|
free_irq(qca->spi_dev->irq, qca); |
|
|
|
kthread_stop(qca->spi_thread); |
|
qca->spi_thread = NULL; |
|
qcaspi_flush_tx_ring(qca); |
|
|
|
return 0; |
|
} |
|
|
|
static netdev_tx_t |
|
qcaspi_netdev_xmit(struct sk_buff *skb, struct net_device *dev) |
|
{ |
|
u32 frame_len; |
|
u8 *ptmp; |
|
struct qcaspi *qca = netdev_priv(dev); |
|
u16 new_tail; |
|
struct sk_buff *tskb; |
|
u8 pad_len = 0; |
|
|
|
if (skb->len < QCAFRM_MIN_LEN) |
|
pad_len = QCAFRM_MIN_LEN - skb->len; |
|
|
|
if (qca->txr.skb[qca->txr.tail]) { |
|
netdev_warn(qca->net_dev, "queue was unexpectedly full!\n"); |
|
netif_stop_queue(qca->net_dev); |
|
qca->stats.ring_full++; |
|
return NETDEV_TX_BUSY; |
|
} |
|
|
|
if ((skb_headroom(skb) < QCAFRM_HEADER_LEN) || |
|
(skb_tailroom(skb) < QCAFRM_FOOTER_LEN + pad_len)) { |
|
tskb = skb_copy_expand(skb, QCAFRM_HEADER_LEN, |
|
QCAFRM_FOOTER_LEN + pad_len, GFP_ATOMIC); |
|
if (!tskb) { |
|
qca->stats.out_of_mem++; |
|
return NETDEV_TX_BUSY; |
|
} |
|
dev_kfree_skb(skb); |
|
skb = tskb; |
|
} |
|
|
|
frame_len = skb->len + pad_len; |
|
|
|
ptmp = skb_push(skb, QCAFRM_HEADER_LEN); |
|
qcafrm_create_header(ptmp, frame_len); |
|
|
|
if (pad_len) { |
|
ptmp = skb_put_zero(skb, pad_len); |
|
} |
|
|
|
ptmp = skb_put(skb, QCAFRM_FOOTER_LEN); |
|
qcafrm_create_footer(ptmp); |
|
|
|
netdev_dbg(qca->net_dev, "Tx-ing packet: Size: 0x%08x\n", |
|
skb->len); |
|
|
|
qca->txr.size += skb->len + QCASPI_HW_PKT_LEN; |
|
|
|
new_tail = qca->txr.tail + 1; |
|
if (new_tail >= qca->txr.count) |
|
new_tail = 0; |
|
|
|
qca->txr.skb[qca->txr.tail] = skb; |
|
qca->txr.tail = new_tail; |
|
|
|
if (!qcaspi_tx_ring_has_space(&qca->txr)) { |
|
netif_stop_queue(qca->net_dev); |
|
qca->stats.ring_full++; |
|
} |
|
|
|
netif_trans_update(dev); |
|
|
|
if (qca->spi_thread) |
|
wake_up_process(qca->spi_thread); |
|
|
|
return NETDEV_TX_OK; |
|
} |
|
|
|
static void |
|
qcaspi_netdev_tx_timeout(struct net_device *dev, unsigned int txqueue) |
|
{ |
|
struct qcaspi *qca = netdev_priv(dev); |
|
|
|
netdev_info(qca->net_dev, "Transmit timeout at %ld, latency %ld\n", |
|
jiffies, jiffies - dev_trans_start(dev)); |
|
qca->net_dev->stats.tx_errors++; |
|
/* Trigger tx queue flush and QCA7000 reset */ |
|
qca->sync = QCASPI_SYNC_UNKNOWN; |
|
|
|
if (qca->spi_thread) |
|
wake_up_process(qca->spi_thread); |
|
} |
|
|
|
static int |
|
qcaspi_netdev_init(struct net_device *dev) |
|
{ |
|
struct qcaspi *qca = netdev_priv(dev); |
|
|
|
dev->mtu = QCAFRM_MAX_MTU; |
|
dev->type = ARPHRD_ETHER; |
|
qca->clkspeed = qcaspi_clkspeed; |
|
qca->burst_len = qcaspi_burst_len; |
|
qca->spi_thread = NULL; |
|
qca->buffer_size = (dev->mtu + VLAN_ETH_HLEN + QCAFRM_HEADER_LEN + |
|
QCAFRM_FOOTER_LEN + 4) * 4; |
|
|
|
memset(&qca->stats, 0, sizeof(struct qcaspi_stats)); |
|
|
|
qca->rx_buffer = kmalloc(qca->buffer_size, GFP_KERNEL); |
|
if (!qca->rx_buffer) |
|
return -ENOBUFS; |
|
|
|
qca->rx_skb = netdev_alloc_skb_ip_align(dev, qca->net_dev->mtu + |
|
VLAN_ETH_HLEN); |
|
if (!qca->rx_skb) { |
|
kfree(qca->rx_buffer); |
|
netdev_info(qca->net_dev, "Failed to allocate RX sk_buff.\n"); |
|
return -ENOBUFS; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static void |
|
qcaspi_netdev_uninit(struct net_device *dev) |
|
{ |
|
struct qcaspi *qca = netdev_priv(dev); |
|
|
|
kfree(qca->rx_buffer); |
|
qca->buffer_size = 0; |
|
dev_kfree_skb(qca->rx_skb); |
|
} |
|
|
|
static const struct net_device_ops qcaspi_netdev_ops = { |
|
.ndo_init = qcaspi_netdev_init, |
|
.ndo_uninit = qcaspi_netdev_uninit, |
|
.ndo_open = qcaspi_netdev_open, |
|
.ndo_stop = qcaspi_netdev_close, |
|
.ndo_start_xmit = qcaspi_netdev_xmit, |
|
.ndo_set_mac_address = eth_mac_addr, |
|
.ndo_tx_timeout = qcaspi_netdev_tx_timeout, |
|
.ndo_validate_addr = eth_validate_addr, |
|
}; |
|
|
|
static void |
|
qcaspi_netdev_setup(struct net_device *dev) |
|
{ |
|
struct qcaspi *qca = NULL; |
|
|
|
dev->netdev_ops = &qcaspi_netdev_ops; |
|
qcaspi_set_ethtool_ops(dev); |
|
dev->watchdog_timeo = QCASPI_TX_TIMEOUT; |
|
dev->priv_flags &= ~IFF_TX_SKB_SHARING; |
|
dev->tx_queue_len = 100; |
|
|
|
/* MTU range: 46 - 1500 */ |
|
dev->min_mtu = QCAFRM_MIN_MTU; |
|
dev->max_mtu = QCAFRM_MAX_MTU; |
|
|
|
qca = netdev_priv(dev); |
|
memset(qca, 0, sizeof(struct qcaspi)); |
|
|
|
memset(&qca->txr, 0, sizeof(qca->txr)); |
|
qca->txr.count = TX_RING_MAX_LEN; |
|
} |
|
|
|
static const struct of_device_id qca_spi_of_match[] = { |
|
{ .compatible = "qca,qca7000" }, |
|
{ /* sentinel */ } |
|
}; |
|
MODULE_DEVICE_TABLE(of, qca_spi_of_match); |
|
|
|
static int |
|
qca_spi_probe(struct spi_device *spi) |
|
{ |
|
struct qcaspi *qca = NULL; |
|
struct net_device *qcaspi_devs = NULL; |
|
u8 legacy_mode = 0; |
|
u16 signature; |
|
int ret; |
|
|
|
if (!spi->dev.of_node) { |
|
dev_err(&spi->dev, "Missing device tree\n"); |
|
return -EINVAL; |
|
} |
|
|
|
legacy_mode = of_property_read_bool(spi->dev.of_node, |
|
"qca,legacy-mode"); |
|
|
|
if (qcaspi_clkspeed == 0) { |
|
if (spi->max_speed_hz) |
|
qcaspi_clkspeed = spi->max_speed_hz; |
|
else |
|
qcaspi_clkspeed = QCASPI_CLK_SPEED; |
|
} |
|
|
|
if ((qcaspi_clkspeed < QCASPI_CLK_SPEED_MIN) || |
|
(qcaspi_clkspeed > QCASPI_CLK_SPEED_MAX)) { |
|
dev_err(&spi->dev, "Invalid clkspeed: %d\n", |
|
qcaspi_clkspeed); |
|
return -EINVAL; |
|
} |
|
|
|
if ((qcaspi_burst_len < QCASPI_BURST_LEN_MIN) || |
|
(qcaspi_burst_len > QCASPI_BURST_LEN_MAX)) { |
|
dev_err(&spi->dev, "Invalid burst len: %d\n", |
|
qcaspi_burst_len); |
|
return -EINVAL; |
|
} |
|
|
|
if ((qcaspi_pluggable < QCASPI_PLUGGABLE_MIN) || |
|
(qcaspi_pluggable > QCASPI_PLUGGABLE_MAX)) { |
|
dev_err(&spi->dev, "Invalid pluggable: %d\n", |
|
qcaspi_pluggable); |
|
return -EINVAL; |
|
} |
|
|
|
if (wr_verify < QCASPI_WRITE_VERIFY_MIN || |
|
wr_verify > QCASPI_WRITE_VERIFY_MAX) { |
|
dev_err(&spi->dev, "Invalid write verify: %d\n", |
|
wr_verify); |
|
return -EINVAL; |
|
} |
|
|
|
dev_info(&spi->dev, "ver=%s, clkspeed=%d, burst_len=%d, pluggable=%d\n", |
|
QCASPI_DRV_VERSION, |
|
qcaspi_clkspeed, |
|
qcaspi_burst_len, |
|
qcaspi_pluggable); |
|
|
|
spi->mode = SPI_MODE_3; |
|
spi->max_speed_hz = qcaspi_clkspeed; |
|
if (spi_setup(spi) < 0) { |
|
dev_err(&spi->dev, "Unable to setup SPI device\n"); |
|
return -EFAULT; |
|
} |
|
|
|
qcaspi_devs = alloc_etherdev(sizeof(struct qcaspi)); |
|
if (!qcaspi_devs) |
|
return -ENOMEM; |
|
|
|
qcaspi_netdev_setup(qcaspi_devs); |
|
SET_NETDEV_DEV(qcaspi_devs, &spi->dev); |
|
|
|
qca = netdev_priv(qcaspi_devs); |
|
if (!qca) { |
|
free_netdev(qcaspi_devs); |
|
dev_err(&spi->dev, "Fail to retrieve private structure\n"); |
|
return -ENOMEM; |
|
} |
|
qca->net_dev = qcaspi_devs; |
|
qca->spi_dev = spi; |
|
qca->legacy_mode = legacy_mode; |
|
|
|
spi_set_drvdata(spi, qcaspi_devs); |
|
|
|
ret = of_get_mac_address(spi->dev.of_node, qca->net_dev->dev_addr); |
|
if (ret) { |
|
eth_hw_addr_random(qca->net_dev); |
|
dev_info(&spi->dev, "Using random MAC address: %pM\n", |
|
qca->net_dev->dev_addr); |
|
} |
|
|
|
netif_carrier_off(qca->net_dev); |
|
|
|
if (!qcaspi_pluggable) { |
|
qcaspi_read_register(qca, SPI_REG_SIGNATURE, &signature); |
|
qcaspi_read_register(qca, SPI_REG_SIGNATURE, &signature); |
|
|
|
if (signature != QCASPI_GOOD_SIGNATURE) { |
|
dev_err(&spi->dev, "Invalid signature (0x%04X)\n", |
|
signature); |
|
free_netdev(qcaspi_devs); |
|
return -EFAULT; |
|
} |
|
} |
|
|
|
if (register_netdev(qcaspi_devs)) { |
|
dev_err(&spi->dev, "Unable to register net device %s\n", |
|
qcaspi_devs->name); |
|
free_netdev(qcaspi_devs); |
|
return -EFAULT; |
|
} |
|
|
|
qcaspi_init_device_debugfs(qca); |
|
|
|
return 0; |
|
} |
|
|
|
static int |
|
qca_spi_remove(struct spi_device *spi) |
|
{ |
|
struct net_device *qcaspi_devs = spi_get_drvdata(spi); |
|
struct qcaspi *qca = netdev_priv(qcaspi_devs); |
|
|
|
qcaspi_remove_device_debugfs(qca); |
|
|
|
unregister_netdev(qcaspi_devs); |
|
free_netdev(qcaspi_devs); |
|
|
|
return 0; |
|
} |
|
|
|
static const struct spi_device_id qca_spi_id[] = { |
|
{ "qca7000", 0 }, |
|
{ /* sentinel */ } |
|
}; |
|
MODULE_DEVICE_TABLE(spi, qca_spi_id); |
|
|
|
static struct spi_driver qca_spi_driver = { |
|
.driver = { |
|
.name = QCASPI_DRV_NAME, |
|
.of_match_table = qca_spi_of_match, |
|
}, |
|
.id_table = qca_spi_id, |
|
.probe = qca_spi_probe, |
|
.remove = qca_spi_remove, |
|
}; |
|
module_spi_driver(qca_spi_driver); |
|
|
|
MODULE_DESCRIPTION("Qualcomm Atheros QCA7000 SPI Driver"); |
|
MODULE_AUTHOR("Qualcomm Atheros Communications"); |
|
MODULE_AUTHOR("Stefan Wahren <[email protected]>"); |
|
MODULE_LICENSE("Dual BSD/GPL"); |
|
MODULE_VERSION(QCASPI_DRV_VERSION);
|
|
|