![Grazvydas Ignotas](/assets/img/avatar_default.png)
Call interface specific power callback before calling board specific one. Also allow that callback to fail. This is how it's done for wl1271 and will be used for runtime_pm support. Signed-off-by: Grazvydas Ignotas <notasas@gmail.com> Acked-by: Kalle Valo <kvalo@adurom.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
356 lines
7.3 KiB
C
356 lines
7.3 KiB
C
/*
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* This file is part of wl1251
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*
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* Copyright (C) 2008 Nokia Corporation
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*
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*/
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#include <linux/irq.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/crc7.h>
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#include <linux/spi/spi.h>
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#include <linux/wl12xx.h>
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#include "wl1251.h"
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#include "reg.h"
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#include "spi.h"
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static irqreturn_t wl1251_irq(int irq, void *cookie)
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{
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struct wl1251 *wl;
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wl1251_debug(DEBUG_IRQ, "IRQ");
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wl = cookie;
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ieee80211_queue_work(wl->hw, &wl->irq_work);
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return IRQ_HANDLED;
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}
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static struct spi_device *wl_to_spi(struct wl1251 *wl)
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{
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return wl->if_priv;
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}
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static void wl1251_spi_reset(struct wl1251 *wl)
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{
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u8 *cmd;
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struct spi_transfer t;
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struct spi_message m;
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cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);
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if (!cmd) {
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wl1251_error("could not allocate cmd for spi reset");
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return;
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}
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memset(&t, 0, sizeof(t));
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spi_message_init(&m);
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memset(cmd, 0xff, WSPI_INIT_CMD_LEN);
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t.tx_buf = cmd;
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t.len = WSPI_INIT_CMD_LEN;
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spi_message_add_tail(&t, &m);
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spi_sync(wl_to_spi(wl), &m);
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wl1251_dump(DEBUG_SPI, "spi reset -> ", cmd, WSPI_INIT_CMD_LEN);
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}
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static void wl1251_spi_wake(struct wl1251 *wl)
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{
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u8 crc[WSPI_INIT_CMD_CRC_LEN], *cmd;
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struct spi_transfer t;
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struct spi_message m;
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cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);
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if (!cmd) {
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wl1251_error("could not allocate cmd for spi init");
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return;
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}
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memset(crc, 0, sizeof(crc));
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memset(&t, 0, sizeof(t));
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spi_message_init(&m);
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/*
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* Set WSPI_INIT_COMMAND
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* the data is being send from the MSB to LSB
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*/
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cmd[2] = 0xff;
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cmd[3] = 0xff;
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cmd[1] = WSPI_INIT_CMD_START | WSPI_INIT_CMD_TX;
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cmd[0] = 0;
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cmd[7] = 0;
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cmd[6] |= HW_ACCESS_WSPI_INIT_CMD_MASK << 3;
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cmd[6] |= HW_ACCESS_WSPI_FIXED_BUSY_LEN & WSPI_INIT_CMD_FIXEDBUSY_LEN;
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if (HW_ACCESS_WSPI_FIXED_BUSY_LEN == 0)
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cmd[5] |= WSPI_INIT_CMD_DIS_FIXEDBUSY;
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else
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cmd[5] |= WSPI_INIT_CMD_EN_FIXEDBUSY;
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cmd[5] |= WSPI_INIT_CMD_IOD | WSPI_INIT_CMD_IP | WSPI_INIT_CMD_CS
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| WSPI_INIT_CMD_WSPI | WSPI_INIT_CMD_WS;
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crc[0] = cmd[1];
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crc[1] = cmd[0];
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crc[2] = cmd[7];
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crc[3] = cmd[6];
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crc[4] = cmd[5];
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cmd[4] |= crc7(0, crc, WSPI_INIT_CMD_CRC_LEN) << 1;
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cmd[4] |= WSPI_INIT_CMD_END;
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t.tx_buf = cmd;
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t.len = WSPI_INIT_CMD_LEN;
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spi_message_add_tail(&t, &m);
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spi_sync(wl_to_spi(wl), &m);
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wl1251_dump(DEBUG_SPI, "spi init -> ", cmd, WSPI_INIT_CMD_LEN);
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}
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static void wl1251_spi_reset_wake(struct wl1251 *wl)
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{
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wl1251_spi_reset(wl);
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wl1251_spi_wake(wl);
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}
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static void wl1251_spi_read(struct wl1251 *wl, int addr, void *buf,
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size_t len)
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{
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struct spi_transfer t[3];
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struct spi_message m;
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u8 *busy_buf;
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u32 *cmd;
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cmd = &wl->buffer_cmd;
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busy_buf = wl->buffer_busyword;
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*cmd = 0;
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*cmd |= WSPI_CMD_READ;
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*cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH;
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*cmd |= addr & WSPI_CMD_BYTE_ADDR;
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spi_message_init(&m);
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memset(t, 0, sizeof(t));
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t[0].tx_buf = cmd;
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t[0].len = 4;
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spi_message_add_tail(&t[0], &m);
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/* Busy and non busy words read */
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t[1].rx_buf = busy_buf;
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t[1].len = WL1251_BUSY_WORD_LEN;
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spi_message_add_tail(&t[1], &m);
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t[2].rx_buf = buf;
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t[2].len = len;
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spi_message_add_tail(&t[2], &m);
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spi_sync(wl_to_spi(wl), &m);
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/* FIXME: check busy words */
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wl1251_dump(DEBUG_SPI, "spi_read cmd -> ", cmd, sizeof(*cmd));
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wl1251_dump(DEBUG_SPI, "spi_read buf <- ", buf, len);
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}
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static void wl1251_spi_write(struct wl1251 *wl, int addr, void *buf,
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size_t len)
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{
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struct spi_transfer t[2];
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struct spi_message m;
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u32 *cmd;
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cmd = &wl->buffer_cmd;
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*cmd = 0;
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*cmd |= WSPI_CMD_WRITE;
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*cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH;
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*cmd |= addr & WSPI_CMD_BYTE_ADDR;
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spi_message_init(&m);
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memset(t, 0, sizeof(t));
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t[0].tx_buf = cmd;
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t[0].len = sizeof(*cmd);
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spi_message_add_tail(&t[0], &m);
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t[1].tx_buf = buf;
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t[1].len = len;
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spi_message_add_tail(&t[1], &m);
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spi_sync(wl_to_spi(wl), &m);
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wl1251_dump(DEBUG_SPI, "spi_write cmd -> ", cmd, sizeof(*cmd));
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wl1251_dump(DEBUG_SPI, "spi_write buf -> ", buf, len);
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}
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static void wl1251_spi_enable_irq(struct wl1251 *wl)
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{
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return enable_irq(wl->irq);
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}
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static void wl1251_spi_disable_irq(struct wl1251 *wl)
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{
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return disable_irq(wl->irq);
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}
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static int wl1251_spi_set_power(struct wl1251 *wl, bool enable)
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{
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if (wl->set_power)
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wl->set_power(enable);
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return 0;
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}
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static const struct wl1251_if_operations wl1251_spi_ops = {
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.read = wl1251_spi_read,
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.write = wl1251_spi_write,
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.reset = wl1251_spi_reset_wake,
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.enable_irq = wl1251_spi_enable_irq,
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.disable_irq = wl1251_spi_disable_irq,
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.power = wl1251_spi_set_power,
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};
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static int __devinit wl1251_spi_probe(struct spi_device *spi)
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{
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struct wl12xx_platform_data *pdata;
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struct ieee80211_hw *hw;
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struct wl1251 *wl;
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int ret;
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pdata = spi->dev.platform_data;
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if (!pdata) {
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wl1251_error("no platform data");
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return -ENODEV;
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}
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hw = wl1251_alloc_hw();
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if (IS_ERR(hw))
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return PTR_ERR(hw);
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wl = hw->priv;
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SET_IEEE80211_DEV(hw, &spi->dev);
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dev_set_drvdata(&spi->dev, wl);
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wl->if_priv = spi;
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wl->if_ops = &wl1251_spi_ops;
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/* This is the only SPI value that we need to set here, the rest
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* comes from the board-peripherals file */
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spi->bits_per_word = 32;
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ret = spi_setup(spi);
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if (ret < 0) {
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wl1251_error("spi_setup failed");
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goto out_free;
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}
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wl->set_power = pdata->set_power;
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if (!wl->set_power) {
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wl1251_error("set power function missing in platform data");
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return -ENODEV;
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}
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wl->irq = spi->irq;
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if (wl->irq < 0) {
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wl1251_error("irq missing in platform data");
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return -ENODEV;
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}
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wl->use_eeprom = pdata->use_eeprom;
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ret = request_irq(wl->irq, wl1251_irq, 0, DRIVER_NAME, wl);
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if (ret < 0) {
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wl1251_error("request_irq() failed: %d", ret);
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goto out_free;
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}
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set_irq_type(wl->irq, IRQ_TYPE_EDGE_RISING);
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disable_irq(wl->irq);
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ret = wl1251_init_ieee80211(wl);
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if (ret)
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goto out_irq;
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return 0;
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out_irq:
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free_irq(wl->irq, wl);
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out_free:
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ieee80211_free_hw(hw);
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return ret;
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}
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static int __devexit wl1251_spi_remove(struct spi_device *spi)
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{
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struct wl1251 *wl = dev_get_drvdata(&spi->dev);
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free_irq(wl->irq, wl);
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wl1251_free_hw(wl);
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return 0;
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}
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static struct spi_driver wl1251_spi_driver = {
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.driver = {
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.name = DRIVER_NAME,
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.bus = &spi_bus_type,
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.owner = THIS_MODULE,
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},
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.probe = wl1251_spi_probe,
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.remove = __devexit_p(wl1251_spi_remove),
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};
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static int __init wl1251_spi_init(void)
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{
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int ret;
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ret = spi_register_driver(&wl1251_spi_driver);
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if (ret < 0) {
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wl1251_error("failed to register spi driver: %d", ret);
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goto out;
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}
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out:
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return ret;
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}
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static void __exit wl1251_spi_exit(void)
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{
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spi_unregister_driver(&wl1251_spi_driver);
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wl1251_notice("unloaded");
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}
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module_init(wl1251_spi_init);
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module_exit(wl1251_spi_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Kalle Valo <kvalo@adurom.com>");
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MODULE_ALIAS("spi:wl1251");
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