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fbdb7fcefe
CONFIG_HOTPLUG is going away as an option. As result the __dev* markings will be going away. Remove use of __devinit, __devexit_p, __devinitdata, __devinitconst, and __devexit. Signed-off-by: Bill Pemberton <wfp5p@virginia.edu> Cc: Dan Williams <dcbw@redhat.com> Cc: libertas-dev@lists.infradead.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: John W. Linville <linville@tuxdriver.com>
1325 lines
32 KiB
C
1325 lines
32 KiB
C
/*
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* linux/drivers/net/wireless/libertas/if_spi.c
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*
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* Driver for Marvell SPI WLAN cards.
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*
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* Copyright 2008 Analog Devices Inc.
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*
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* Authors:
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* Andrey Yurovsky <andrey@cozybit.com>
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* Colin McCabe <colin@cozybit.com>
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*
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* Inspired by if_sdio.c, Copyright 2007-2008 Pierre Ossman
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/hardirq.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/firmware.h>
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#include <linux/jiffies.h>
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#include <linux/list.h>
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#include <linux/netdevice.h>
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#include <linux/slab.h>
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#include <linux/spi/libertas_spi.h>
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#include <linux/spi/spi.h>
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#include "host.h"
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#include "decl.h"
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#include "defs.h"
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#include "dev.h"
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#include "if_spi.h"
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struct if_spi_packet {
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struct list_head list;
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u16 blen;
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u8 buffer[0] __attribute__((aligned(4)));
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};
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struct if_spi_card {
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struct spi_device *spi;
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struct lbs_private *priv;
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struct libertas_spi_platform_data *pdata;
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/* The card ID and card revision, as reported by the hardware. */
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u16 card_id;
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u8 card_rev;
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/* The last time that we initiated an SPU operation */
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unsigned long prev_xfer_time;
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int use_dummy_writes;
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unsigned long spu_port_delay;
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unsigned long spu_reg_delay;
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/* Handles all SPI communication (except for FW load) */
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struct workqueue_struct *workqueue;
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struct work_struct packet_work;
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struct work_struct resume_work;
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u8 cmd_buffer[IF_SPI_CMD_BUF_SIZE];
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/* A buffer of incoming packets from libertas core.
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* Since we can't sleep in hw_host_to_card, we have to buffer
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* them. */
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struct list_head cmd_packet_list;
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struct list_head data_packet_list;
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/* Protects cmd_packet_list and data_packet_list */
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spinlock_t buffer_lock;
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/* True is card suspended */
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u8 suspended;
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};
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static void free_if_spi_card(struct if_spi_card *card)
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{
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struct list_head *cursor, *next;
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struct if_spi_packet *packet;
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list_for_each_safe(cursor, next, &card->cmd_packet_list) {
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packet = container_of(cursor, struct if_spi_packet, list);
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list_del(&packet->list);
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kfree(packet);
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}
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list_for_each_safe(cursor, next, &card->data_packet_list) {
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packet = container_of(cursor, struct if_spi_packet, list);
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list_del(&packet->list);
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kfree(packet);
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}
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spi_set_drvdata(card->spi, NULL);
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kfree(card);
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}
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#define MODEL_8385 0x04
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#define MODEL_8686 0x0b
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#define MODEL_8688 0x10
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static const struct lbs_fw_table fw_table[] = {
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{ MODEL_8385, "libertas/gspi8385_helper.bin", "libertas/gspi8385.bin" },
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{ MODEL_8385, "libertas/gspi8385_hlp.bin", "libertas/gspi8385.bin" },
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{ MODEL_8686, "libertas/gspi8686_v9_helper.bin", "libertas/gspi8686_v9.bin" },
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{ MODEL_8686, "libertas/gspi8686_hlp.bin", "libertas/gspi8686.bin" },
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{ MODEL_8688, "libertas/gspi8688_helper.bin", "libertas/gspi8688.bin" },
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{ 0, NULL, NULL }
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};
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MODULE_FIRMWARE("libertas/gspi8385_helper.bin");
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MODULE_FIRMWARE("libertas/gspi8385_hlp.bin");
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MODULE_FIRMWARE("libertas/gspi8385.bin");
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MODULE_FIRMWARE("libertas/gspi8686_v9_helper.bin");
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MODULE_FIRMWARE("libertas/gspi8686_v9.bin");
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MODULE_FIRMWARE("libertas/gspi8686_hlp.bin");
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MODULE_FIRMWARE("libertas/gspi8686.bin");
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MODULE_FIRMWARE("libertas/gspi8688_helper.bin");
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MODULE_FIRMWARE("libertas/gspi8688.bin");
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/*
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* SPI Interface Unit Routines
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*
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* The SPU sits between the host and the WLAN module.
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* All communication with the firmware is through SPU transactions.
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*
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* First we have to put a SPU register name on the bus. Then we can
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* either read from or write to that register.
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*
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*/
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static void spu_transaction_init(struct if_spi_card *card)
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{
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if (!time_after(jiffies, card->prev_xfer_time + 1)) {
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/* Unfortunately, the SPU requires a delay between successive
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* transactions. If our last transaction was more than a jiffy
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* ago, we have obviously already delayed enough.
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* If not, we have to busy-wait to be on the safe side. */
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ndelay(400);
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}
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}
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static void spu_transaction_finish(struct if_spi_card *card)
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{
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card->prev_xfer_time = jiffies;
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}
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/*
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* Write out a byte buffer to an SPI register,
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* using a series of 16-bit transfers.
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*/
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static int spu_write(struct if_spi_card *card, u16 reg, const u8 *buf, int len)
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{
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int err = 0;
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__le16 reg_out = cpu_to_le16(reg | IF_SPI_WRITE_OPERATION_MASK);
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struct spi_message m;
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struct spi_transfer reg_trans;
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struct spi_transfer data_trans;
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spi_message_init(&m);
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memset(®_trans, 0, sizeof(reg_trans));
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memset(&data_trans, 0, sizeof(data_trans));
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/* You must give an even number of bytes to the SPU, even if it
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* doesn't care about the last one. */
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BUG_ON(len & 0x1);
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spu_transaction_init(card);
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/* write SPU register index */
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reg_trans.tx_buf = ®_out;
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reg_trans.len = sizeof(reg_out);
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data_trans.tx_buf = buf;
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data_trans.len = len;
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spi_message_add_tail(®_trans, &m);
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spi_message_add_tail(&data_trans, &m);
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err = spi_sync(card->spi, &m);
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spu_transaction_finish(card);
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return err;
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}
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static inline int spu_write_u16(struct if_spi_card *card, u16 reg, u16 val)
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{
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__le16 buff;
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buff = cpu_to_le16(val);
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return spu_write(card, reg, (u8 *)&buff, sizeof(u16));
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}
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static inline int spu_reg_is_port_reg(u16 reg)
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{
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switch (reg) {
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case IF_SPI_IO_RDWRPORT_REG:
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case IF_SPI_CMD_RDWRPORT_REG:
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case IF_SPI_DATA_RDWRPORT_REG:
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return 1;
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default:
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return 0;
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}
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}
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static int spu_read(struct if_spi_card *card, u16 reg, u8 *buf, int len)
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{
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unsigned int delay;
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int err = 0;
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__le16 reg_out = cpu_to_le16(reg | IF_SPI_READ_OPERATION_MASK);
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struct spi_message m;
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struct spi_transfer reg_trans;
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struct spi_transfer dummy_trans;
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struct spi_transfer data_trans;
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/*
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* You must take an even number of bytes from the SPU, even if you
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* don't care about the last one.
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*/
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BUG_ON(len & 0x1);
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spu_transaction_init(card);
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spi_message_init(&m);
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memset(®_trans, 0, sizeof(reg_trans));
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memset(&dummy_trans, 0, sizeof(dummy_trans));
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memset(&data_trans, 0, sizeof(data_trans));
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/* write SPU register index */
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reg_trans.tx_buf = ®_out;
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reg_trans.len = sizeof(reg_out);
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spi_message_add_tail(®_trans, &m);
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delay = spu_reg_is_port_reg(reg) ? card->spu_port_delay :
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card->spu_reg_delay;
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if (card->use_dummy_writes) {
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/* Clock in dummy cycles while the SPU fills the FIFO */
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dummy_trans.len = delay / 8;
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spi_message_add_tail(&dummy_trans, &m);
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} else {
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/* Busy-wait while the SPU fills the FIFO */
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reg_trans.delay_usecs =
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DIV_ROUND_UP((100 + (delay * 10)), 1000);
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}
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/* read in data */
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data_trans.rx_buf = buf;
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data_trans.len = len;
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spi_message_add_tail(&data_trans, &m);
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err = spi_sync(card->spi, &m);
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spu_transaction_finish(card);
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return err;
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}
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/* Read 16 bits from an SPI register */
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static inline int spu_read_u16(struct if_spi_card *card, u16 reg, u16 *val)
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{
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__le16 buf;
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int ret;
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ret = spu_read(card, reg, (u8 *)&buf, sizeof(buf));
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if (ret == 0)
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*val = le16_to_cpup(&buf);
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return ret;
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}
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/*
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* Read 32 bits from an SPI register.
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* The low 16 bits are read first.
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*/
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static int spu_read_u32(struct if_spi_card *card, u16 reg, u32 *val)
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{
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__le32 buf;
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int err;
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err = spu_read(card, reg, (u8 *)&buf, sizeof(buf));
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if (!err)
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*val = le32_to_cpup(&buf);
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return err;
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}
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/*
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* Keep reading 16 bits from an SPI register until you get the correct result.
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*
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* If mask = 0, the correct result is any non-zero number.
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* If mask != 0, the correct result is any number where
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* number & target_mask == target
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*
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* Returns -ETIMEDOUT if a second passes without the correct result.
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*/
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static int spu_wait_for_u16(struct if_spi_card *card, u16 reg,
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u16 target_mask, u16 target)
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{
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int err;
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unsigned long timeout = jiffies + 5*HZ;
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while (1) {
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u16 val;
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err = spu_read_u16(card, reg, &val);
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if (err)
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return err;
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if (target_mask) {
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if ((val & target_mask) == target)
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return 0;
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} else {
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if (val)
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return 0;
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}
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udelay(100);
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if (time_after(jiffies, timeout)) {
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pr_err("%s: timeout with val=%02x, target_mask=%02x, target=%02x\n",
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__func__, val, target_mask, target);
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return -ETIMEDOUT;
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}
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}
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}
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/*
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* Read 16 bits from an SPI register until you receive a specific value.
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* Returns -ETIMEDOUT if a 4 tries pass without success.
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*/
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static int spu_wait_for_u32(struct if_spi_card *card, u32 reg, u32 target)
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{
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int err, try;
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for (try = 0; try < 4; ++try) {
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u32 val = 0;
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err = spu_read_u32(card, reg, &val);
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if (err)
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return err;
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if (val == target)
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return 0;
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mdelay(100);
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}
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return -ETIMEDOUT;
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}
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static int spu_set_interrupt_mode(struct if_spi_card *card,
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int suppress_host_int,
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int auto_int)
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{
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int err = 0;
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/*
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* We can suppress a host interrupt by clearing the appropriate
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* bit in the "host interrupt status mask" register
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*/
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if (suppress_host_int) {
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err = spu_write_u16(card, IF_SPI_HOST_INT_STATUS_MASK_REG, 0);
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if (err)
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return err;
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} else {
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err = spu_write_u16(card, IF_SPI_HOST_INT_STATUS_MASK_REG,
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IF_SPI_HISM_TX_DOWNLOAD_RDY |
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IF_SPI_HISM_RX_UPLOAD_RDY |
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IF_SPI_HISM_CMD_DOWNLOAD_RDY |
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IF_SPI_HISM_CARDEVENT |
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IF_SPI_HISM_CMD_UPLOAD_RDY);
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if (err)
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return err;
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}
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/*
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* If auto-interrupts are on, the completion of certain transactions
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* will trigger an interrupt automatically. If auto-interrupts
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* are off, we need to set the "Card Interrupt Cause" register to
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* trigger a card interrupt.
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*/
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if (auto_int) {
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err = spu_write_u16(card, IF_SPI_HOST_INT_CTRL_REG,
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IF_SPI_HICT_TX_DOWNLOAD_OVER_AUTO |
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IF_SPI_HICT_RX_UPLOAD_OVER_AUTO |
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IF_SPI_HICT_CMD_DOWNLOAD_OVER_AUTO |
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IF_SPI_HICT_CMD_UPLOAD_OVER_AUTO);
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if (err)
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return err;
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} else {
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err = spu_write_u16(card, IF_SPI_HOST_INT_STATUS_MASK_REG, 0);
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if (err)
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return err;
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}
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return err;
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}
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static int spu_get_chip_revision(struct if_spi_card *card,
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u16 *card_id, u8 *card_rev)
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{
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int err = 0;
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u32 dev_ctrl;
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err = spu_read_u32(card, IF_SPI_DEVICEID_CTRL_REG, &dev_ctrl);
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if (err)
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return err;
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*card_id = IF_SPI_DEVICEID_CTRL_REG_TO_CARD_ID(dev_ctrl);
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*card_rev = IF_SPI_DEVICEID_CTRL_REG_TO_CARD_REV(dev_ctrl);
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return err;
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}
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static int spu_set_bus_mode(struct if_spi_card *card, u16 mode)
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{
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int err = 0;
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u16 rval;
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/* set bus mode */
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err = spu_write_u16(card, IF_SPI_SPU_BUS_MODE_REG, mode);
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if (err)
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return err;
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/* Check that we were able to read back what we just wrote. */
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err = spu_read_u16(card, IF_SPI_SPU_BUS_MODE_REG, &rval);
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if (err)
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return err;
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if ((rval & 0xF) != mode) {
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pr_err("Can't read bus mode register\n");
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return -EIO;
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}
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return 0;
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}
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static int spu_init(struct if_spi_card *card, int use_dummy_writes)
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{
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int err = 0;
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u32 delay;
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/*
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* We have to start up in timed delay mode so that we can safely
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* read the Delay Read Register.
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*/
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card->use_dummy_writes = 0;
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err = spu_set_bus_mode(card,
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IF_SPI_BUS_MODE_SPI_CLOCK_PHASE_RISING |
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IF_SPI_BUS_MODE_DELAY_METHOD_TIMED |
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IF_SPI_BUS_MODE_16_BIT_ADDRESS_16_BIT_DATA);
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if (err)
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return err;
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card->spu_port_delay = 1000;
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card->spu_reg_delay = 1000;
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err = spu_read_u32(card, IF_SPI_DELAY_READ_REG, &delay);
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if (err)
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return err;
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card->spu_port_delay = delay & 0x0000ffff;
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card->spu_reg_delay = (delay & 0xffff0000) >> 16;
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/* If dummy clock delay mode has been requested, switch to it now */
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if (use_dummy_writes) {
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card->use_dummy_writes = 1;
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err = spu_set_bus_mode(card,
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IF_SPI_BUS_MODE_SPI_CLOCK_PHASE_RISING |
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IF_SPI_BUS_MODE_DELAY_METHOD_DUMMY_CLOCK |
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IF_SPI_BUS_MODE_16_BIT_ADDRESS_16_BIT_DATA);
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if (err)
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return err;
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}
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lbs_deb_spi("Initialized SPU unit. "
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"spu_port_delay=0x%04lx, spu_reg_delay=0x%04lx\n",
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card->spu_port_delay, card->spu_reg_delay);
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return err;
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}
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/*
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* Firmware Loading
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*/
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static int if_spi_prog_helper_firmware(struct if_spi_card *card,
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const struct firmware *firmware)
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{
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int err = 0;
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int bytes_remaining;
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const u8 *fw;
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u8 temp[HELPER_FW_LOAD_CHUNK_SZ];
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lbs_deb_enter(LBS_DEB_SPI);
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err = spu_set_interrupt_mode(card, 1, 0);
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if (err)
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goto out;
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bytes_remaining = firmware->size;
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fw = firmware->data;
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/* Load helper firmware image */
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while (bytes_remaining > 0) {
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/*
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* Scratch pad 1 should contain the number of bytes we
|
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* want to download to the firmware
|
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*/
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err = spu_write_u16(card, IF_SPI_SCRATCH_1_REG,
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HELPER_FW_LOAD_CHUNK_SZ);
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if (err)
|
|
goto out;
|
|
|
|
err = spu_wait_for_u16(card, IF_SPI_HOST_INT_STATUS_REG,
|
|
IF_SPI_HIST_CMD_DOWNLOAD_RDY,
|
|
IF_SPI_HIST_CMD_DOWNLOAD_RDY);
|
|
if (err)
|
|
goto out;
|
|
|
|
/*
|
|
* Feed the data into the command read/write port reg
|
|
* in chunks of 64 bytes
|
|
*/
|
|
memset(temp, 0, sizeof(temp));
|
|
memcpy(temp, fw,
|
|
min(bytes_remaining, HELPER_FW_LOAD_CHUNK_SZ));
|
|
mdelay(10);
|
|
err = spu_write(card, IF_SPI_CMD_RDWRPORT_REG,
|
|
temp, HELPER_FW_LOAD_CHUNK_SZ);
|
|
if (err)
|
|
goto out;
|
|
|
|
/* Interrupt the boot code */
|
|
err = spu_write_u16(card, IF_SPI_HOST_INT_STATUS_REG, 0);
|
|
if (err)
|
|
goto out;
|
|
err = spu_write_u16(card, IF_SPI_CARD_INT_CAUSE_REG,
|
|
IF_SPI_CIC_CMD_DOWNLOAD_OVER);
|
|
if (err)
|
|
goto out;
|
|
bytes_remaining -= HELPER_FW_LOAD_CHUNK_SZ;
|
|
fw += HELPER_FW_LOAD_CHUNK_SZ;
|
|
}
|
|
|
|
/*
|
|
* Once the helper / single stage firmware download is complete,
|
|
* write 0 to scratch pad 1 and interrupt the
|
|
* bootloader. This completes the helper download.
|
|
*/
|
|
err = spu_write_u16(card, IF_SPI_SCRATCH_1_REG, FIRMWARE_DNLD_OK);
|
|
if (err)
|
|
goto out;
|
|
err = spu_write_u16(card, IF_SPI_HOST_INT_STATUS_REG, 0);
|
|
if (err)
|
|
goto out;
|
|
err = spu_write_u16(card, IF_SPI_CARD_INT_CAUSE_REG,
|
|
IF_SPI_CIC_CMD_DOWNLOAD_OVER);
|
|
out:
|
|
if (err)
|
|
pr_err("failed to load helper firmware (err=%d)\n", err);
|
|
lbs_deb_leave_args(LBS_DEB_SPI, "err %d", err);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Returns the length of the next packet the firmware expects us to send.
|
|
* Sets crc_err if the previous transfer had a CRC error.
|
|
*/
|
|
static int if_spi_prog_main_firmware_check_len(struct if_spi_card *card,
|
|
int *crc_err)
|
|
{
|
|
u16 len;
|
|
int err = 0;
|
|
|
|
/*
|
|
* wait until the host interrupt status register indicates
|
|
* that we are ready to download
|
|
*/
|
|
err = spu_wait_for_u16(card, IF_SPI_HOST_INT_STATUS_REG,
|
|
IF_SPI_HIST_CMD_DOWNLOAD_RDY,
|
|
IF_SPI_HIST_CMD_DOWNLOAD_RDY);
|
|
if (err) {
|
|
pr_err("timed out waiting for host_int_status\n");
|
|
return err;
|
|
}
|
|
|
|
/* Ask the device how many bytes of firmware it wants. */
|
|
err = spu_read_u16(card, IF_SPI_SCRATCH_1_REG, &len);
|
|
if (err)
|
|
return err;
|
|
|
|
if (len > IF_SPI_CMD_BUF_SIZE) {
|
|
pr_err("firmware load device requested a larger transfer than we are prepared to handle (len = %d)\n",
|
|
len);
|
|
return -EIO;
|
|
}
|
|
if (len & 0x1) {
|
|
lbs_deb_spi("%s: crc error\n", __func__);
|
|
len &= ~0x1;
|
|
*crc_err = 1;
|
|
} else
|
|
*crc_err = 0;
|
|
|
|
return len;
|
|
}
|
|
|
|
static int if_spi_prog_main_firmware(struct if_spi_card *card,
|
|
const struct firmware *firmware)
|
|
{
|
|
struct lbs_private *priv = card->priv;
|
|
int len, prev_len;
|
|
int bytes, crc_err = 0, err = 0;
|
|
const u8 *fw;
|
|
u16 num_crc_errs;
|
|
|
|
lbs_deb_enter(LBS_DEB_SPI);
|
|
|
|
err = spu_set_interrupt_mode(card, 1, 0);
|
|
if (err)
|
|
goto out;
|
|
|
|
err = spu_wait_for_u16(card, IF_SPI_SCRATCH_1_REG, 0, 0);
|
|
if (err) {
|
|
netdev_err(priv->dev,
|
|
"%s: timed out waiting for initial scratch reg = 0\n",
|
|
__func__);
|
|
goto out;
|
|
}
|
|
|
|
num_crc_errs = 0;
|
|
prev_len = 0;
|
|
bytes = firmware->size;
|
|
fw = firmware->data;
|
|
while ((len = if_spi_prog_main_firmware_check_len(card, &crc_err))) {
|
|
if (len < 0) {
|
|
err = len;
|
|
goto out;
|
|
}
|
|
if (bytes < 0) {
|
|
/*
|
|
* If there are no more bytes left, we would normally
|
|
* expect to have terminated with len = 0
|
|
*/
|
|
netdev_err(priv->dev,
|
|
"Firmware load wants more bytes than we have to offer.\n");
|
|
break;
|
|
}
|
|
if (crc_err) {
|
|
/* Previous transfer failed. */
|
|
if (++num_crc_errs > MAX_MAIN_FW_LOAD_CRC_ERR) {
|
|
pr_err("Too many CRC errors encountered in firmware load.\n");
|
|
err = -EIO;
|
|
goto out;
|
|
}
|
|
} else {
|
|
/* Previous transfer succeeded. Advance counters. */
|
|
bytes -= prev_len;
|
|
fw += prev_len;
|
|
}
|
|
if (bytes < len) {
|
|
memset(card->cmd_buffer, 0, len);
|
|
memcpy(card->cmd_buffer, fw, bytes);
|
|
} else
|
|
memcpy(card->cmd_buffer, fw, len);
|
|
|
|
err = spu_write_u16(card, IF_SPI_HOST_INT_STATUS_REG, 0);
|
|
if (err)
|
|
goto out;
|
|
err = spu_write(card, IF_SPI_CMD_RDWRPORT_REG,
|
|
card->cmd_buffer, len);
|
|
if (err)
|
|
goto out;
|
|
err = spu_write_u16(card, IF_SPI_CARD_INT_CAUSE_REG ,
|
|
IF_SPI_CIC_CMD_DOWNLOAD_OVER);
|
|
if (err)
|
|
goto out;
|
|
prev_len = len;
|
|
}
|
|
if (bytes > prev_len) {
|
|
pr_err("firmware load wants fewer bytes than we have to offer\n");
|
|
}
|
|
|
|
/* Confirm firmware download */
|
|
err = spu_wait_for_u32(card, IF_SPI_SCRATCH_4_REG,
|
|
SUCCESSFUL_FW_DOWNLOAD_MAGIC);
|
|
if (err) {
|
|
pr_err("failed to confirm the firmware download\n");
|
|
goto out;
|
|
}
|
|
|
|
out:
|
|
if (err)
|
|
pr_err("failed to load firmware (err=%d)\n", err);
|
|
lbs_deb_leave_args(LBS_DEB_SPI, "err %d", err);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* SPI Transfer Thread
|
|
*
|
|
* The SPI worker handles all SPI transfers, so there is no need for a lock.
|
|
*/
|
|
|
|
/* Move a command from the card to the host */
|
|
static int if_spi_c2h_cmd(struct if_spi_card *card)
|
|
{
|
|
struct lbs_private *priv = card->priv;
|
|
unsigned long flags;
|
|
int err = 0;
|
|
u16 len;
|
|
u8 i;
|
|
|
|
/*
|
|
* We need a buffer big enough to handle whatever people send to
|
|
* hw_host_to_card
|
|
*/
|
|
BUILD_BUG_ON(IF_SPI_CMD_BUF_SIZE < LBS_CMD_BUFFER_SIZE);
|
|
BUILD_BUG_ON(IF_SPI_CMD_BUF_SIZE < LBS_UPLD_SIZE);
|
|
|
|
/*
|
|
* It's just annoying if the buffer size isn't a multiple of 4, because
|
|
* then we might have len < IF_SPI_CMD_BUF_SIZE but
|
|
* ALIGN(len, 4) > IF_SPI_CMD_BUF_SIZE
|
|
*/
|
|
BUILD_BUG_ON(IF_SPI_CMD_BUF_SIZE % 4 != 0);
|
|
|
|
lbs_deb_enter(LBS_DEB_SPI);
|
|
|
|
/* How many bytes are there to read? */
|
|
err = spu_read_u16(card, IF_SPI_SCRATCH_2_REG, &len);
|
|
if (err)
|
|
goto out;
|
|
if (!len) {
|
|
netdev_err(priv->dev, "%s: error: card has no data for host\n",
|
|
__func__);
|
|
err = -EINVAL;
|
|
goto out;
|
|
} else if (len > IF_SPI_CMD_BUF_SIZE) {
|
|
netdev_err(priv->dev,
|
|
"%s: error: response packet too large: %d bytes, but maximum is %d\n",
|
|
__func__, len, IF_SPI_CMD_BUF_SIZE);
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
/* Read the data from the WLAN module into our command buffer */
|
|
err = spu_read(card, IF_SPI_CMD_RDWRPORT_REG,
|
|
card->cmd_buffer, ALIGN(len, 4));
|
|
if (err)
|
|
goto out;
|
|
|
|
spin_lock_irqsave(&priv->driver_lock, flags);
|
|
i = (priv->resp_idx == 0) ? 1 : 0;
|
|
BUG_ON(priv->resp_len[i]);
|
|
priv->resp_len[i] = len;
|
|
memcpy(priv->resp_buf[i], card->cmd_buffer, len);
|
|
lbs_notify_command_response(priv, i);
|
|
spin_unlock_irqrestore(&priv->driver_lock, flags);
|
|
|
|
out:
|
|
if (err)
|
|
netdev_err(priv->dev, "%s: err=%d\n", __func__, err);
|
|
lbs_deb_leave(LBS_DEB_SPI);
|
|
return err;
|
|
}
|
|
|
|
/* Move data from the card to the host */
|
|
static int if_spi_c2h_data(struct if_spi_card *card)
|
|
{
|
|
struct lbs_private *priv = card->priv;
|
|
struct sk_buff *skb;
|
|
char *data;
|
|
u16 len;
|
|
int err = 0;
|
|
|
|
lbs_deb_enter(LBS_DEB_SPI);
|
|
|
|
/* How many bytes are there to read? */
|
|
err = spu_read_u16(card, IF_SPI_SCRATCH_1_REG, &len);
|
|
if (err)
|
|
goto out;
|
|
if (!len) {
|
|
netdev_err(priv->dev, "%s: error: card has no data for host\n",
|
|
__func__);
|
|
err = -EINVAL;
|
|
goto out;
|
|
} else if (len > MRVDRV_ETH_RX_PACKET_BUFFER_SIZE) {
|
|
netdev_err(priv->dev,
|
|
"%s: error: card has %d bytes of data, but our maximum skb size is %zu\n",
|
|
__func__, len, MRVDRV_ETH_RX_PACKET_BUFFER_SIZE);
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
/* TODO: should we allocate a smaller skb if we have less data? */
|
|
skb = dev_alloc_skb(MRVDRV_ETH_RX_PACKET_BUFFER_SIZE);
|
|
if (!skb) {
|
|
err = -ENOBUFS;
|
|
goto out;
|
|
}
|
|
skb_reserve(skb, IPFIELD_ALIGN_OFFSET);
|
|
data = skb_put(skb, len);
|
|
|
|
/* Read the data from the WLAN module into our skb... */
|
|
err = spu_read(card, IF_SPI_DATA_RDWRPORT_REG, data, ALIGN(len, 4));
|
|
if (err)
|
|
goto free_skb;
|
|
|
|
/* pass the SKB to libertas */
|
|
err = lbs_process_rxed_packet(card->priv, skb);
|
|
if (err)
|
|
goto free_skb;
|
|
|
|
/* success */
|
|
goto out;
|
|
|
|
free_skb:
|
|
dev_kfree_skb(skb);
|
|
out:
|
|
if (err)
|
|
netdev_err(priv->dev, "%s: err=%d\n", __func__, err);
|
|
lbs_deb_leave(LBS_DEB_SPI);
|
|
return err;
|
|
}
|
|
|
|
/* Move data or a command from the host to the card. */
|
|
static void if_spi_h2c(struct if_spi_card *card,
|
|
struct if_spi_packet *packet, int type)
|
|
{
|
|
struct lbs_private *priv = card->priv;
|
|
int err = 0;
|
|
u16 int_type, port_reg;
|
|
|
|
switch (type) {
|
|
case MVMS_DAT:
|
|
int_type = IF_SPI_CIC_TX_DOWNLOAD_OVER;
|
|
port_reg = IF_SPI_DATA_RDWRPORT_REG;
|
|
break;
|
|
case MVMS_CMD:
|
|
int_type = IF_SPI_CIC_CMD_DOWNLOAD_OVER;
|
|
port_reg = IF_SPI_CMD_RDWRPORT_REG;
|
|
break;
|
|
default:
|
|
netdev_err(priv->dev, "can't transfer buffer of type %d\n",
|
|
type);
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
/* Write the data to the card */
|
|
err = spu_write(card, port_reg, packet->buffer, packet->blen);
|
|
if (err)
|
|
goto out;
|
|
|
|
out:
|
|
kfree(packet);
|
|
|
|
if (err)
|
|
netdev_err(priv->dev, "%s: error %d\n", __func__, err);
|
|
}
|
|
|
|
/* Inform the host about a card event */
|
|
static void if_spi_e2h(struct if_spi_card *card)
|
|
{
|
|
int err = 0;
|
|
u32 cause;
|
|
struct lbs_private *priv = card->priv;
|
|
|
|
err = spu_read_u32(card, IF_SPI_SCRATCH_3_REG, &cause);
|
|
if (err)
|
|
goto out;
|
|
|
|
/* re-enable the card event interrupt */
|
|
spu_write_u16(card, IF_SPI_HOST_INT_STATUS_REG,
|
|
~IF_SPI_HICU_CARD_EVENT);
|
|
|
|
/* generate a card interrupt */
|
|
spu_write_u16(card, IF_SPI_CARD_INT_CAUSE_REG, IF_SPI_CIC_HOST_EVENT);
|
|
|
|
lbs_queue_event(priv, cause & 0xff);
|
|
out:
|
|
if (err)
|
|
netdev_err(priv->dev, "%s: error %d\n", __func__, err);
|
|
}
|
|
|
|
static void if_spi_host_to_card_worker(struct work_struct *work)
|
|
{
|
|
int err;
|
|
struct if_spi_card *card;
|
|
u16 hiStatus;
|
|
unsigned long flags;
|
|
struct if_spi_packet *packet;
|
|
struct lbs_private *priv;
|
|
|
|
card = container_of(work, struct if_spi_card, packet_work);
|
|
priv = card->priv;
|
|
|
|
lbs_deb_enter(LBS_DEB_SPI);
|
|
|
|
/*
|
|
* Read the host interrupt status register to see what we
|
|
* can do.
|
|
*/
|
|
err = spu_read_u16(card, IF_SPI_HOST_INT_STATUS_REG,
|
|
&hiStatus);
|
|
if (err) {
|
|
netdev_err(priv->dev, "I/O error\n");
|
|
goto err;
|
|
}
|
|
|
|
if (hiStatus & IF_SPI_HIST_CMD_UPLOAD_RDY) {
|
|
err = if_spi_c2h_cmd(card);
|
|
if (err)
|
|
goto err;
|
|
}
|
|
if (hiStatus & IF_SPI_HIST_RX_UPLOAD_RDY) {
|
|
err = if_spi_c2h_data(card);
|
|
if (err)
|
|
goto err;
|
|
}
|
|
|
|
/*
|
|
* workaround: in PS mode, the card does not set the Command
|
|
* Download Ready bit, but it sets TX Download Ready.
|
|
*/
|
|
if (hiStatus & IF_SPI_HIST_CMD_DOWNLOAD_RDY ||
|
|
(card->priv->psstate != PS_STATE_FULL_POWER &&
|
|
(hiStatus & IF_SPI_HIST_TX_DOWNLOAD_RDY))) {
|
|
/*
|
|
* This means two things. First of all,
|
|
* if there was a previous command sent, the card has
|
|
* successfully received it.
|
|
* Secondly, it is now ready to download another
|
|
* command.
|
|
*/
|
|
lbs_host_to_card_done(card->priv);
|
|
|
|
/* Do we have any command packets from the host to send? */
|
|
packet = NULL;
|
|
spin_lock_irqsave(&card->buffer_lock, flags);
|
|
if (!list_empty(&card->cmd_packet_list)) {
|
|
packet = (struct if_spi_packet *)(card->
|
|
cmd_packet_list.next);
|
|
list_del(&packet->list);
|
|
}
|
|
spin_unlock_irqrestore(&card->buffer_lock, flags);
|
|
|
|
if (packet)
|
|
if_spi_h2c(card, packet, MVMS_CMD);
|
|
}
|
|
if (hiStatus & IF_SPI_HIST_TX_DOWNLOAD_RDY) {
|
|
/* Do we have any data packets from the host to send? */
|
|
packet = NULL;
|
|
spin_lock_irqsave(&card->buffer_lock, flags);
|
|
if (!list_empty(&card->data_packet_list)) {
|
|
packet = (struct if_spi_packet *)(card->
|
|
data_packet_list.next);
|
|
list_del(&packet->list);
|
|
}
|
|
spin_unlock_irqrestore(&card->buffer_lock, flags);
|
|
|
|
if (packet)
|
|
if_spi_h2c(card, packet, MVMS_DAT);
|
|
}
|
|
if (hiStatus & IF_SPI_HIST_CARD_EVENT)
|
|
if_spi_e2h(card);
|
|
|
|
err:
|
|
if (err)
|
|
netdev_err(priv->dev, "%s: got error %d\n", __func__, err);
|
|
|
|
lbs_deb_leave(LBS_DEB_SPI);
|
|
}
|
|
|
|
/*
|
|
* Host to Card
|
|
*
|
|
* Called from Libertas to transfer some data to the WLAN device
|
|
* We can't sleep here.
|
|
*/
|
|
static int if_spi_host_to_card(struct lbs_private *priv,
|
|
u8 type, u8 *buf, u16 nb)
|
|
{
|
|
int err = 0;
|
|
unsigned long flags;
|
|
struct if_spi_card *card = priv->card;
|
|
struct if_spi_packet *packet;
|
|
u16 blen;
|
|
|
|
lbs_deb_enter_args(LBS_DEB_SPI, "type %d, bytes %d", type, nb);
|
|
|
|
if (nb == 0) {
|
|
netdev_err(priv->dev, "%s: invalid size requested: %d\n",
|
|
__func__, nb);
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
blen = ALIGN(nb, 4);
|
|
packet = kzalloc(sizeof(struct if_spi_packet) + blen, GFP_ATOMIC);
|
|
if (!packet) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
packet->blen = blen;
|
|
memcpy(packet->buffer, buf, nb);
|
|
memset(packet->buffer + nb, 0, blen - nb);
|
|
|
|
switch (type) {
|
|
case MVMS_CMD:
|
|
priv->dnld_sent = DNLD_CMD_SENT;
|
|
spin_lock_irqsave(&card->buffer_lock, flags);
|
|
list_add_tail(&packet->list, &card->cmd_packet_list);
|
|
spin_unlock_irqrestore(&card->buffer_lock, flags);
|
|
break;
|
|
case MVMS_DAT:
|
|
priv->dnld_sent = DNLD_DATA_SENT;
|
|
spin_lock_irqsave(&card->buffer_lock, flags);
|
|
list_add_tail(&packet->list, &card->data_packet_list);
|
|
spin_unlock_irqrestore(&card->buffer_lock, flags);
|
|
break;
|
|
default:
|
|
kfree(packet);
|
|
netdev_err(priv->dev, "can't transfer buffer of type %d\n",
|
|
type);
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
/* Queue spi xfer work */
|
|
queue_work(card->workqueue, &card->packet_work);
|
|
out:
|
|
lbs_deb_leave_args(LBS_DEB_SPI, "err=%d", err);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Host Interrupts
|
|
*
|
|
* Service incoming interrupts from the WLAN device. We can't sleep here, so
|
|
* don't try to talk on the SPI bus, just queue the SPI xfer work.
|
|
*/
|
|
static irqreturn_t if_spi_host_interrupt(int irq, void *dev_id)
|
|
{
|
|
struct if_spi_card *card = dev_id;
|
|
|
|
queue_work(card->workqueue, &card->packet_work);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
/*
|
|
* SPI callbacks
|
|
*/
|
|
|
|
static int if_spi_init_card(struct if_spi_card *card)
|
|
{
|
|
struct lbs_private *priv = card->priv;
|
|
int err, i;
|
|
u32 scratch;
|
|
const struct firmware *helper = NULL;
|
|
const struct firmware *mainfw = NULL;
|
|
|
|
lbs_deb_enter(LBS_DEB_SPI);
|
|
|
|
err = spu_init(card, card->pdata->use_dummy_writes);
|
|
if (err)
|
|
goto out;
|
|
err = spu_get_chip_revision(card, &card->card_id, &card->card_rev);
|
|
if (err)
|
|
goto out;
|
|
|
|
err = spu_read_u32(card, IF_SPI_SCRATCH_4_REG, &scratch);
|
|
if (err)
|
|
goto out;
|
|
if (scratch == SUCCESSFUL_FW_DOWNLOAD_MAGIC)
|
|
lbs_deb_spi("Firmware is already loaded for "
|
|
"Marvell WLAN 802.11 adapter\n");
|
|
else {
|
|
/* Check if we support this card */
|
|
for (i = 0; i < ARRAY_SIZE(fw_table); i++) {
|
|
if (card->card_id == fw_table[i].model)
|
|
break;
|
|
}
|
|
if (i == ARRAY_SIZE(fw_table)) {
|
|
netdev_err(priv->dev, "Unsupported chip_id: 0x%02x\n",
|
|
card->card_id);
|
|
err = -ENODEV;
|
|
goto out;
|
|
}
|
|
|
|
err = lbs_get_firmware(&card->spi->dev, card->card_id,
|
|
&fw_table[0], &helper, &mainfw);
|
|
if (err) {
|
|
netdev_err(priv->dev, "failed to find firmware (%d)\n",
|
|
err);
|
|
goto out;
|
|
}
|
|
|
|
lbs_deb_spi("Initializing FW for Marvell WLAN 802.11 adapter "
|
|
"(chip_id = 0x%04x, chip_rev = 0x%02x) "
|
|
"attached to SPI bus_num %d, chip_select %d. "
|
|
"spi->max_speed_hz=%d\n",
|
|
card->card_id, card->card_rev,
|
|
card->spi->master->bus_num,
|
|
card->spi->chip_select,
|
|
card->spi->max_speed_hz);
|
|
err = if_spi_prog_helper_firmware(card, helper);
|
|
if (err)
|
|
goto out;
|
|
err = if_spi_prog_main_firmware(card, mainfw);
|
|
if (err)
|
|
goto out;
|
|
lbs_deb_spi("loaded FW for Marvell WLAN 802.11 adapter\n");
|
|
}
|
|
|
|
err = spu_set_interrupt_mode(card, 0, 1);
|
|
if (err)
|
|
goto out;
|
|
|
|
out:
|
|
release_firmware(helper);
|
|
release_firmware(mainfw);
|
|
|
|
lbs_deb_leave_args(LBS_DEB_SPI, "err %d\n", err);
|
|
|
|
return err;
|
|
}
|
|
|
|
static void if_spi_resume_worker(struct work_struct *work)
|
|
{
|
|
struct if_spi_card *card;
|
|
|
|
card = container_of(work, struct if_spi_card, resume_work);
|
|
|
|
if (card->suspended) {
|
|
if (card->pdata->setup)
|
|
card->pdata->setup(card->spi);
|
|
|
|
/* Init card ... */
|
|
if_spi_init_card(card);
|
|
|
|
enable_irq(card->spi->irq);
|
|
|
|
/* And resume it ... */
|
|
lbs_resume(card->priv);
|
|
|
|
card->suspended = 0;
|
|
}
|
|
}
|
|
|
|
static int if_spi_probe(struct spi_device *spi)
|
|
{
|
|
struct if_spi_card *card;
|
|
struct lbs_private *priv = NULL;
|
|
struct libertas_spi_platform_data *pdata = spi->dev.platform_data;
|
|
int err = 0;
|
|
|
|
lbs_deb_enter(LBS_DEB_SPI);
|
|
|
|
if (!pdata) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
if (pdata->setup) {
|
|
err = pdata->setup(spi);
|
|
if (err)
|
|
goto out;
|
|
}
|
|
|
|
/* Allocate card structure to represent this specific device */
|
|
card = kzalloc(sizeof(struct if_spi_card), GFP_KERNEL);
|
|
if (!card) {
|
|
err = -ENOMEM;
|
|
goto teardown;
|
|
}
|
|
spi_set_drvdata(spi, card);
|
|
card->pdata = pdata;
|
|
card->spi = spi;
|
|
card->prev_xfer_time = jiffies;
|
|
|
|
INIT_LIST_HEAD(&card->cmd_packet_list);
|
|
INIT_LIST_HEAD(&card->data_packet_list);
|
|
spin_lock_init(&card->buffer_lock);
|
|
|
|
/* Initialize the SPI Interface Unit */
|
|
|
|
/* Firmware load */
|
|
err = if_spi_init_card(card);
|
|
if (err)
|
|
goto free_card;
|
|
|
|
/*
|
|
* Register our card with libertas.
|
|
* This will call alloc_etherdev.
|
|
*/
|
|
priv = lbs_add_card(card, &spi->dev);
|
|
if (!priv) {
|
|
err = -ENOMEM;
|
|
goto free_card;
|
|
}
|
|
card->priv = priv;
|
|
priv->setup_fw_on_resume = 1;
|
|
priv->card = card;
|
|
priv->hw_host_to_card = if_spi_host_to_card;
|
|
priv->enter_deep_sleep = NULL;
|
|
priv->exit_deep_sleep = NULL;
|
|
priv->reset_deep_sleep_wakeup = NULL;
|
|
priv->fw_ready = 1;
|
|
|
|
/* Initialize interrupt handling stuff. */
|
|
card->workqueue = create_workqueue("libertas_spi");
|
|
INIT_WORK(&card->packet_work, if_spi_host_to_card_worker);
|
|
INIT_WORK(&card->resume_work, if_spi_resume_worker);
|
|
|
|
err = request_irq(spi->irq, if_spi_host_interrupt,
|
|
IRQF_TRIGGER_FALLING, "libertas_spi", card);
|
|
if (err) {
|
|
pr_err("can't get host irq line-- request_irq failed\n");
|
|
goto terminate_workqueue;
|
|
}
|
|
|
|
/*
|
|
* Start the card.
|
|
* This will call register_netdev, and we'll start
|
|
* getting interrupts...
|
|
*/
|
|
err = lbs_start_card(priv);
|
|
if (err)
|
|
goto release_irq;
|
|
|
|
lbs_deb_spi("Finished initializing WLAN module.\n");
|
|
|
|
/* successful exit */
|
|
goto out;
|
|
|
|
release_irq:
|
|
free_irq(spi->irq, card);
|
|
terminate_workqueue:
|
|
flush_workqueue(card->workqueue);
|
|
destroy_workqueue(card->workqueue);
|
|
lbs_remove_card(priv); /* will call free_netdev */
|
|
free_card:
|
|
free_if_spi_card(card);
|
|
teardown:
|
|
if (pdata->teardown)
|
|
pdata->teardown(spi);
|
|
out:
|
|
lbs_deb_leave_args(LBS_DEB_SPI, "err %d\n", err);
|
|
return err;
|
|
}
|
|
|
|
static int libertas_spi_remove(struct spi_device *spi)
|
|
{
|
|
struct if_spi_card *card = spi_get_drvdata(spi);
|
|
struct lbs_private *priv = card->priv;
|
|
|
|
lbs_deb_spi("libertas_spi_remove\n");
|
|
lbs_deb_enter(LBS_DEB_SPI);
|
|
|
|
cancel_work_sync(&card->resume_work);
|
|
|
|
lbs_stop_card(priv);
|
|
lbs_remove_card(priv); /* will call free_netdev */
|
|
|
|
free_irq(spi->irq, card);
|
|
flush_workqueue(card->workqueue);
|
|
destroy_workqueue(card->workqueue);
|
|
if (card->pdata->teardown)
|
|
card->pdata->teardown(spi);
|
|
free_if_spi_card(card);
|
|
lbs_deb_leave(LBS_DEB_SPI);
|
|
return 0;
|
|
}
|
|
|
|
static int if_spi_suspend(struct device *dev)
|
|
{
|
|
struct spi_device *spi = to_spi_device(dev);
|
|
struct if_spi_card *card = spi_get_drvdata(spi);
|
|
|
|
if (!card->suspended) {
|
|
lbs_suspend(card->priv);
|
|
flush_workqueue(card->workqueue);
|
|
disable_irq(spi->irq);
|
|
|
|
if (card->pdata->teardown)
|
|
card->pdata->teardown(spi);
|
|
card->suspended = 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int if_spi_resume(struct device *dev)
|
|
{
|
|
struct spi_device *spi = to_spi_device(dev);
|
|
struct if_spi_card *card = spi_get_drvdata(spi);
|
|
|
|
/* Schedule delayed work */
|
|
schedule_work(&card->resume_work);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct dev_pm_ops if_spi_pm_ops = {
|
|
.suspend = if_spi_suspend,
|
|
.resume = if_spi_resume,
|
|
};
|
|
|
|
static struct spi_driver libertas_spi_driver = {
|
|
.probe = if_spi_probe,
|
|
.remove = libertas_spi_remove,
|
|
.driver = {
|
|
.name = "libertas_spi",
|
|
.owner = THIS_MODULE,
|
|
.pm = &if_spi_pm_ops,
|
|
},
|
|
};
|
|
|
|
/*
|
|
* Module functions
|
|
*/
|
|
|
|
static int __init if_spi_init_module(void)
|
|
{
|
|
int ret = 0;
|
|
lbs_deb_enter(LBS_DEB_SPI);
|
|
printk(KERN_INFO "libertas_spi: Libertas SPI driver\n");
|
|
ret = spi_register_driver(&libertas_spi_driver);
|
|
lbs_deb_leave(LBS_DEB_SPI);
|
|
return ret;
|
|
}
|
|
|
|
static void __exit if_spi_exit_module(void)
|
|
{
|
|
lbs_deb_enter(LBS_DEB_SPI);
|
|
spi_unregister_driver(&libertas_spi_driver);
|
|
lbs_deb_leave(LBS_DEB_SPI);
|
|
}
|
|
|
|
module_init(if_spi_init_module);
|
|
module_exit(if_spi_exit_module);
|
|
|
|
MODULE_DESCRIPTION("Libertas SPI WLAN Driver");
|
|
MODULE_AUTHOR("Andrey Yurovsky <andrey@cozybit.com>, "
|
|
"Colin McCabe <colin@cozybit.com>");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("spi:libertas_spi");
|