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alistair23-linux/drivers/net/ieee802154/at86rf230.c
Sascha Herrmann 057dad6fcb at86rf230: change irq handling to prevent lockups with edge type irq 
Implemented separate irq handling for edge and level type interrupt
configuration. For edge type interrupts calls to disable_irq_nosync()
and enable_irq() are removed. The at86rf230 resets the irq line only
after the irq status register is read. Disabling the irq can lock the
driver in situations where a irq is set by the radio while the driver
is still reading the frame buffer.

With irq_type configuration set to 0 the original behavior is
preserverd.

Additional the irq filter register is set to filter out all unused
interrupts and the irq status register is read in the probe
function to clear the irq line.

Signed-off-by: Sascha Herrmann <sascha@ps.nvbi.de>

Conflicts:
	drivers/net/ieee802154/at86rf230.c
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-04-16 16:34:08 -04:00

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/*
* AT86RF230/RF231 driver
*
* Copyright (C) 2009-2012 Siemens AG
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Written by:
* Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
* Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/gpio.h>
#include <linux/delay.h>
#include <linux/mutex.h>
#include <linux/workqueue.h>
#include <linux/spinlock.h>
#include <linux/spi/spi.h>
#include <linux/spi/at86rf230.h>
#include <linux/skbuff.h>
#include <net/mac802154.h>
#include <net/wpan-phy.h>
struct at86rf230_local {
struct spi_device *spi;
int rstn, slp_tr, dig2;
u8 part;
u8 vers;
u8 buf[2];
struct mutex bmux;
struct work_struct irqwork;
struct completion tx_complete;
struct ieee802154_dev *dev;
spinlock_t lock;
bool irq_busy;
bool is_tx;
};
#define RG_TRX_STATUS (0x01)
#define SR_TRX_STATUS 0x01, 0x1f, 0
#define SR_RESERVED_01_3 0x01, 0x20, 5
#define SR_CCA_STATUS 0x01, 0x40, 6
#define SR_CCA_DONE 0x01, 0x80, 7
#define RG_TRX_STATE (0x02)
#define SR_TRX_CMD 0x02, 0x1f, 0
#define SR_TRAC_STATUS 0x02, 0xe0, 5
#define RG_TRX_CTRL_0 (0x03)
#define SR_CLKM_CTRL 0x03, 0x07, 0
#define SR_CLKM_SHA_SEL 0x03, 0x08, 3
#define SR_PAD_IO_CLKM 0x03, 0x30, 4
#define SR_PAD_IO 0x03, 0xc0, 6
#define RG_TRX_CTRL_1 (0x04)
#define SR_IRQ_POLARITY 0x04, 0x01, 0
#define SR_IRQ_MASK_MODE 0x04, 0x02, 1
#define SR_SPI_CMD_MODE 0x04, 0x0c, 2
#define SR_RX_BL_CTRL 0x04, 0x10, 4
#define SR_TX_AUTO_CRC_ON 0x04, 0x20, 5
#define SR_IRQ_2_EXT_EN 0x04, 0x40, 6
#define SR_PA_EXT_EN 0x04, 0x80, 7
#define RG_PHY_TX_PWR (0x05)
#define SR_TX_PWR 0x05, 0x0f, 0
#define SR_PA_LT 0x05, 0x30, 4
#define SR_PA_BUF_LT 0x05, 0xc0, 6
#define RG_PHY_RSSI (0x06)
#define SR_RSSI 0x06, 0x1f, 0
#define SR_RND_VALUE 0x06, 0x60, 5
#define SR_RX_CRC_VALID 0x06, 0x80, 7
#define RG_PHY_ED_LEVEL (0x07)
#define SR_ED_LEVEL 0x07, 0xff, 0
#define RG_PHY_CC_CCA (0x08)
#define SR_CHANNEL 0x08, 0x1f, 0
#define SR_CCA_MODE 0x08, 0x60, 5
#define SR_CCA_REQUEST 0x08, 0x80, 7
#define RG_CCA_THRES (0x09)
#define SR_CCA_ED_THRES 0x09, 0x0f, 0
#define SR_RESERVED_09_1 0x09, 0xf0, 4
#define RG_RX_CTRL (0x0a)
#define SR_PDT_THRES 0x0a, 0x0f, 0
#define SR_RESERVED_0a_1 0x0a, 0xf0, 4
#define RG_SFD_VALUE (0x0b)
#define SR_SFD_VALUE 0x0b, 0xff, 0
#define RG_TRX_CTRL_2 (0x0c)
#define SR_OQPSK_DATA_RATE 0x0c, 0x03, 0
#define SR_RESERVED_0c_2 0x0c, 0x7c, 2
#define SR_RX_SAFE_MODE 0x0c, 0x80, 7
#define RG_ANT_DIV (0x0d)
#define SR_ANT_CTRL 0x0d, 0x03, 0
#define SR_ANT_EXT_SW_EN 0x0d, 0x04, 2
#define SR_ANT_DIV_EN 0x0d, 0x08, 3
#define SR_RESERVED_0d_2 0x0d, 0x70, 4
#define SR_ANT_SEL 0x0d, 0x80, 7
#define RG_IRQ_MASK (0x0e)
#define SR_IRQ_MASK 0x0e, 0xff, 0
#define RG_IRQ_STATUS (0x0f)
#define SR_IRQ_0_PLL_LOCK 0x0f, 0x01, 0
#define SR_IRQ_1_PLL_UNLOCK 0x0f, 0x02, 1
#define SR_IRQ_2_RX_START 0x0f, 0x04, 2
#define SR_IRQ_3_TRX_END 0x0f, 0x08, 3
#define SR_IRQ_4_CCA_ED_DONE 0x0f, 0x10, 4
#define SR_IRQ_5_AMI 0x0f, 0x20, 5
#define SR_IRQ_6_TRX_UR 0x0f, 0x40, 6
#define SR_IRQ_7_BAT_LOW 0x0f, 0x80, 7
#define RG_VREG_CTRL (0x10)
#define SR_RESERVED_10_6 0x10, 0x03, 0
#define SR_DVDD_OK 0x10, 0x04, 2
#define SR_DVREG_EXT 0x10, 0x08, 3
#define SR_RESERVED_10_3 0x10, 0x30, 4
#define SR_AVDD_OK 0x10, 0x40, 6
#define SR_AVREG_EXT 0x10, 0x80, 7
#define RG_BATMON (0x11)
#define SR_BATMON_VTH 0x11, 0x0f, 0
#define SR_BATMON_HR 0x11, 0x10, 4
#define SR_BATMON_OK 0x11, 0x20, 5
#define SR_RESERVED_11_1 0x11, 0xc0, 6
#define RG_XOSC_CTRL (0x12)
#define SR_XTAL_TRIM 0x12, 0x0f, 0
#define SR_XTAL_MODE 0x12, 0xf0, 4
#define RG_RX_SYN (0x15)
#define SR_RX_PDT_LEVEL 0x15, 0x0f, 0
#define SR_RESERVED_15_2 0x15, 0x70, 4
#define SR_RX_PDT_DIS 0x15, 0x80, 7
#define RG_XAH_CTRL_1 (0x17)
#define SR_RESERVED_17_8 0x17, 0x01, 0
#define SR_AACK_PROM_MODE 0x17, 0x02, 1
#define SR_AACK_ACK_TIME 0x17, 0x04, 2
#define SR_RESERVED_17_5 0x17, 0x08, 3
#define SR_AACK_UPLD_RES_FT 0x17, 0x10, 4
#define SR_AACK_FLTR_RES_FT 0x17, 0x20, 5
#define SR_RESERVED_17_2 0x17, 0x40, 6
#define SR_RESERVED_17_1 0x17, 0x80, 7
#define RG_FTN_CTRL (0x18)
#define SR_RESERVED_18_2 0x18, 0x7f, 0
#define SR_FTN_START 0x18, 0x80, 7
#define RG_PLL_CF (0x1a)
#define SR_RESERVED_1a_2 0x1a, 0x7f, 0
#define SR_PLL_CF_START 0x1a, 0x80, 7
#define RG_PLL_DCU (0x1b)
#define SR_RESERVED_1b_3 0x1b, 0x3f, 0
#define SR_RESERVED_1b_2 0x1b, 0x40, 6
#define SR_PLL_DCU_START 0x1b, 0x80, 7
#define RG_PART_NUM (0x1c)
#define SR_PART_NUM 0x1c, 0xff, 0
#define RG_VERSION_NUM (0x1d)
#define SR_VERSION_NUM 0x1d, 0xff, 0
#define RG_MAN_ID_0 (0x1e)
#define SR_MAN_ID_0 0x1e, 0xff, 0
#define RG_MAN_ID_1 (0x1f)
#define SR_MAN_ID_1 0x1f, 0xff, 0
#define RG_SHORT_ADDR_0 (0x20)
#define SR_SHORT_ADDR_0 0x20, 0xff, 0
#define RG_SHORT_ADDR_1 (0x21)
#define SR_SHORT_ADDR_1 0x21, 0xff, 0
#define RG_PAN_ID_0 (0x22)
#define SR_PAN_ID_0 0x22, 0xff, 0
#define RG_PAN_ID_1 (0x23)
#define SR_PAN_ID_1 0x23, 0xff, 0
#define RG_IEEE_ADDR_0 (0x24)
#define SR_IEEE_ADDR_0 0x24, 0xff, 0
#define RG_IEEE_ADDR_1 (0x25)
#define SR_IEEE_ADDR_1 0x25, 0xff, 0
#define RG_IEEE_ADDR_2 (0x26)
#define SR_IEEE_ADDR_2 0x26, 0xff, 0
#define RG_IEEE_ADDR_3 (0x27)
#define SR_IEEE_ADDR_3 0x27, 0xff, 0
#define RG_IEEE_ADDR_4 (0x28)
#define SR_IEEE_ADDR_4 0x28, 0xff, 0
#define RG_IEEE_ADDR_5 (0x29)
#define SR_IEEE_ADDR_5 0x29, 0xff, 0
#define RG_IEEE_ADDR_6 (0x2a)
#define SR_IEEE_ADDR_6 0x2a, 0xff, 0
#define RG_IEEE_ADDR_7 (0x2b)
#define SR_IEEE_ADDR_7 0x2b, 0xff, 0
#define RG_XAH_CTRL_0 (0x2c)
#define SR_SLOTTED_OPERATION 0x2c, 0x01, 0
#define SR_MAX_CSMA_RETRIES 0x2c, 0x0e, 1
#define SR_MAX_FRAME_RETRIES 0x2c, 0xf0, 4
#define RG_CSMA_SEED_0 (0x2d)
#define SR_CSMA_SEED_0 0x2d, 0xff, 0
#define RG_CSMA_SEED_1 (0x2e)
#define SR_CSMA_SEED_1 0x2e, 0x07, 0
#define SR_AACK_I_AM_COORD 0x2e, 0x08, 3
#define SR_AACK_DIS_ACK 0x2e, 0x10, 4
#define SR_AACK_SET_PD 0x2e, 0x20, 5
#define SR_AACK_FVN_MODE 0x2e, 0xc0, 6
#define RG_CSMA_BE (0x2f)
#define SR_MIN_BE 0x2f, 0x0f, 0
#define SR_MAX_BE 0x2f, 0xf0, 4
#define CMD_REG 0x80
#define CMD_REG_MASK 0x3f
#define CMD_WRITE 0x40
#define CMD_FB 0x20
#define IRQ_BAT_LOW (1 << 7)
#define IRQ_TRX_UR (1 << 6)
#define IRQ_AMI (1 << 5)
#define IRQ_CCA_ED (1 << 4)
#define IRQ_TRX_END (1 << 3)
#define IRQ_RX_START (1 << 2)
#define IRQ_PLL_UNL (1 << 1)
#define IRQ_PLL_LOCK (1 << 0)
#define IRQ_ACTIVE_HIGH 0
#define IRQ_ACTIVE_LOW 1
#define STATE_P_ON 0x00 /* BUSY */
#define STATE_BUSY_RX 0x01
#define STATE_BUSY_TX 0x02
#define STATE_FORCE_TRX_OFF 0x03
#define STATE_FORCE_TX_ON 0x04 /* IDLE */
/* 0x05 */ /* INVALID_PARAMETER */
#define STATE_RX_ON 0x06
/* 0x07 */ /* SUCCESS */
#define STATE_TRX_OFF 0x08
#define STATE_TX_ON 0x09
/* 0x0a - 0x0e */ /* 0x0a - UNSUPPORTED_ATTRIBUTE */
#define STATE_SLEEP 0x0F
#define STATE_BUSY_RX_AACK 0x11
#define STATE_BUSY_TX_ARET 0x12
#define STATE_RX_AACK_ON 0x16
#define STATE_TX_ARET_ON 0x19
#define STATE_RX_ON_NOCLK 0x1C
#define STATE_RX_AACK_ON_NOCLK 0x1D
#define STATE_BUSY_RX_AACK_NOCLK 0x1E
#define STATE_TRANSITION_IN_PROGRESS 0x1F
static int
__at86rf230_write(struct at86rf230_local *lp, u8 addr, u8 data)
{
u8 *buf = lp->buf;
int status;
struct spi_message msg;
struct spi_transfer xfer = {
.len = 2,
.tx_buf = buf,
};
buf[0] = (addr & CMD_REG_MASK) | CMD_REG | CMD_WRITE;
buf[1] = data;
dev_vdbg(&lp->spi->dev, "buf[0] = %02x\n", buf[0]);
dev_vdbg(&lp->spi->dev, "buf[1] = %02x\n", buf[1]);
spi_message_init(&msg);
spi_message_add_tail(&xfer, &msg);
status = spi_sync(lp->spi, &msg);
dev_vdbg(&lp->spi->dev, "status = %d\n", status);
if (msg.status)
status = msg.status;
dev_vdbg(&lp->spi->dev, "status = %d\n", status);
dev_vdbg(&lp->spi->dev, "buf[0] = %02x\n", buf[0]);
dev_vdbg(&lp->spi->dev, "buf[1] = %02x\n", buf[1]);
return status;
}
static int
__at86rf230_read_subreg(struct at86rf230_local *lp,
u8 addr, u8 mask, int shift, u8 *data)
{
u8 *buf = lp->buf;
int status;
struct spi_message msg;
struct spi_transfer xfer = {
.len = 2,
.tx_buf = buf,
.rx_buf = buf,
};
buf[0] = (addr & CMD_REG_MASK) | CMD_REG;
buf[1] = 0xff;
dev_vdbg(&lp->spi->dev, "buf[0] = %02x\n", buf[0]);
spi_message_init(&msg);
spi_message_add_tail(&xfer, &msg);
status = spi_sync(lp->spi, &msg);
dev_vdbg(&lp->spi->dev, "status = %d\n", status);
if (msg.status)
status = msg.status;
dev_vdbg(&lp->spi->dev, "status = %d\n", status);
dev_vdbg(&lp->spi->dev, "buf[0] = %02x\n", buf[0]);
dev_vdbg(&lp->spi->dev, "buf[1] = %02x\n", buf[1]);
if (status == 0)
*data = buf[1];
return status;
}
static int
at86rf230_read_subreg(struct at86rf230_local *lp,
u8 addr, u8 mask, int shift, u8 *data)
{
int status;
mutex_lock(&lp->bmux);
status = __at86rf230_read_subreg(lp, addr, mask, shift, data);
mutex_unlock(&lp->bmux);
return status;
}
static int
at86rf230_write_subreg(struct at86rf230_local *lp,
u8 addr, u8 mask, int shift, u8 data)
{
int status;
u8 val;
mutex_lock(&lp->bmux);
status = __at86rf230_read_subreg(lp, addr, 0xff, 0, &val);
if (status)
goto out;
val &= ~mask;
val |= (data << shift) & mask;
status = __at86rf230_write(lp, addr, val);
out:
mutex_unlock(&lp->bmux);
return status;
}
static int
at86rf230_write_fbuf(struct at86rf230_local *lp, u8 *data, u8 len)
{
u8 *buf = lp->buf;
int status;
struct spi_message msg;
struct spi_transfer xfer_head = {
.len = 2,
.tx_buf = buf,
};
struct spi_transfer xfer_buf = {
.len = len,
.tx_buf = data,
};
mutex_lock(&lp->bmux);
buf[0] = CMD_WRITE | CMD_FB;
buf[1] = len + 2; /* 2 bytes for CRC that isn't written */
dev_vdbg(&lp->spi->dev, "buf[0] = %02x\n", buf[0]);
dev_vdbg(&lp->spi->dev, "buf[1] = %02x\n", buf[1]);
spi_message_init(&msg);
spi_message_add_tail(&xfer_head, &msg);
spi_message_add_tail(&xfer_buf, &msg);
status = spi_sync(lp->spi, &msg);
dev_vdbg(&lp->spi->dev, "status = %d\n", status);
if (msg.status)
status = msg.status;
dev_vdbg(&lp->spi->dev, "status = %d\n", status);
dev_vdbg(&lp->spi->dev, "buf[0] = %02x\n", buf[0]);
dev_vdbg(&lp->spi->dev, "buf[1] = %02x\n", buf[1]);
mutex_unlock(&lp->bmux);
return status;
}
static int
at86rf230_read_fbuf(struct at86rf230_local *lp, u8 *data, u8 *len, u8 *lqi)
{
u8 *buf = lp->buf;
int status;
struct spi_message msg;
struct spi_transfer xfer_head = {
.len = 2,
.tx_buf = buf,
.rx_buf = buf,
};
struct spi_transfer xfer_head1 = {
.len = 2,
.tx_buf = buf,
.rx_buf = buf,
};
struct spi_transfer xfer_buf = {
.len = 0,
.rx_buf = data,
};
mutex_lock(&lp->bmux);
buf[0] = CMD_FB;
buf[1] = 0x00;
spi_message_init(&msg);
spi_message_add_tail(&xfer_head, &msg);
status = spi_sync(lp->spi, &msg);
dev_vdbg(&lp->spi->dev, "status = %d\n", status);
xfer_buf.len = *(buf + 1) + 1;
*len = buf[1];
buf[0] = CMD_FB;
buf[1] = 0x00;
spi_message_init(&msg);
spi_message_add_tail(&xfer_head1, &msg);
spi_message_add_tail(&xfer_buf, &msg);
status = spi_sync(lp->spi, &msg);
if (msg.status)
status = msg.status;
dev_vdbg(&lp->spi->dev, "status = %d\n", status);
dev_vdbg(&lp->spi->dev, "buf[0] = %02x\n", buf[0]);
dev_vdbg(&lp->spi->dev, "buf[1] = %02x\n", buf[1]);
if (status) {
if (lqi && (*len > lp->buf[1]))
*lqi = data[lp->buf[1]];
}
mutex_unlock(&lp->bmux);
return status;
}
static int
at86rf230_ed(struct ieee802154_dev *dev, u8 *level)
{
might_sleep();
BUG_ON(!level);
*level = 0xbe;
return 0;
}
static int
at86rf230_state(struct ieee802154_dev *dev, int state)
{
struct at86rf230_local *lp = dev->priv;
int rc;
u8 val;
u8 desired_status;
might_sleep();
if (state == STATE_FORCE_TX_ON)
desired_status = STATE_TX_ON;
else if (state == STATE_FORCE_TRX_OFF)
desired_status = STATE_TRX_OFF;
else
desired_status = state;
do {
rc = at86rf230_read_subreg(lp, SR_TRX_STATUS, &val);
if (rc)
goto err;
} while (val == STATE_TRANSITION_IN_PROGRESS);
if (val == desired_status)
return 0;
/* state is equal to phy states */
rc = at86rf230_write_subreg(lp, SR_TRX_CMD, state);
if (rc)
goto err;
do {
rc = at86rf230_read_subreg(lp, SR_TRX_STATUS, &val);
if (rc)
goto err;
} while (val == STATE_TRANSITION_IN_PROGRESS);
if (val == desired_status)
return 0;
pr_err("unexpected state change: %d, asked for %d\n", val, state);
return -EBUSY;
err:
pr_err("error: %d\n", rc);
return rc;
}
static int
at86rf230_start(struct ieee802154_dev *dev)
{
struct at86rf230_local *lp = dev->priv;
u8 rc;
rc = at86rf230_write_subreg(lp, SR_RX_SAFE_MODE, 1);
if (rc)
return rc;
return at86rf230_state(dev, STATE_RX_ON);
}
static void
at86rf230_stop(struct ieee802154_dev *dev)
{
at86rf230_state(dev, STATE_FORCE_TRX_OFF);
}
static int
at86rf230_channel(struct ieee802154_dev *dev, int page, int channel)
{
struct at86rf230_local *lp = dev->priv;
int rc;
might_sleep();
if (page != 0 || channel < 11 || channel > 26) {
WARN_ON(1);
return -EINVAL;
}
rc = at86rf230_write_subreg(lp, SR_CHANNEL, channel);
msleep(1); /* Wait for PLL */
dev->phy->current_channel = channel;
return 0;
}
static int
at86rf230_xmit(struct ieee802154_dev *dev, struct sk_buff *skb)
{
struct at86rf230_local *lp = dev->priv;
int rc;
unsigned long flags;
spin_lock(&lp->lock);
if (lp->irq_busy) {
spin_unlock(&lp->lock);
return -EBUSY;
}
spin_unlock(&lp->lock);
might_sleep();
rc = at86rf230_state(dev, STATE_FORCE_TX_ON);
if (rc)
goto err;
spin_lock_irqsave(&lp->lock, flags);
lp->is_tx = 1;
INIT_COMPLETION(lp->tx_complete);
spin_unlock_irqrestore(&lp->lock, flags);
rc = at86rf230_write_fbuf(lp, skb->data, skb->len);
if (rc)
goto err_rx;
rc = at86rf230_write_subreg(lp, SR_TRX_CMD, STATE_BUSY_TX);
if (rc)
goto err_rx;
rc = wait_for_completion_interruptible(&lp->tx_complete);
if (rc < 0)
goto err_rx;
rc = at86rf230_start(dev);
return rc;
err_rx:
at86rf230_start(dev);
err:
pr_err("error: %d\n", rc);
spin_lock_irqsave(&lp->lock, flags);
lp->is_tx = 0;
spin_unlock_irqrestore(&lp->lock, flags);
return rc;
}
static int at86rf230_rx(struct at86rf230_local *lp)
{
u8 len = 128, lqi = 0;
struct sk_buff *skb;
skb = alloc_skb(len, GFP_KERNEL);
if (!skb)
return -ENOMEM;
if (at86rf230_read_fbuf(lp, skb_put(skb, len), &len, &lqi))
goto err;
if (len < 2)
goto err;
skb_trim(skb, len - 2); /* We do not put CRC into the frame */
ieee802154_rx_irqsafe(lp->dev, skb, lqi);
dev_dbg(&lp->spi->dev, "READ_FBUF: %d %x\n", len, lqi);
return 0;
err:
pr_debug("received frame is too small\n");
kfree_skb(skb);
return -EINVAL;
}
static int
at86rf230_set_hw_addr_filt(struct ieee802154_dev *dev,
struct ieee802154_hw_addr_filt *filt,
unsigned long changed)
{
struct at86rf230_local *lp = dev->priv;
if (changed & IEEE802515_AFILT_SADDR_CHANGED) {
dev_vdbg(&lp->spi->dev,
"at86rf230_set_hw_addr_filt called for saddr\n");
__at86rf230_write(lp, RG_SHORT_ADDR_0, filt->short_addr);
__at86rf230_write(lp, RG_SHORT_ADDR_1, filt->short_addr >> 8);
}
if (changed & IEEE802515_AFILT_PANID_CHANGED) {
dev_vdbg(&lp->spi->dev,
"at86rf230_set_hw_addr_filt called for pan id\n");
__at86rf230_write(lp, RG_PAN_ID_0, filt->pan_id);
__at86rf230_write(lp, RG_PAN_ID_1, filt->pan_id >> 8);
}
if (changed & IEEE802515_AFILT_IEEEADDR_CHANGED) {
dev_vdbg(&lp->spi->dev,
"at86rf230_set_hw_addr_filt called for IEEE addr\n");
at86rf230_write_subreg(lp, SR_IEEE_ADDR_0, filt->ieee_addr[7]);
at86rf230_write_subreg(lp, SR_IEEE_ADDR_1, filt->ieee_addr[6]);
at86rf230_write_subreg(lp, SR_IEEE_ADDR_2, filt->ieee_addr[5]);
at86rf230_write_subreg(lp, SR_IEEE_ADDR_3, filt->ieee_addr[4]);
at86rf230_write_subreg(lp, SR_IEEE_ADDR_4, filt->ieee_addr[3]);
at86rf230_write_subreg(lp, SR_IEEE_ADDR_5, filt->ieee_addr[2]);
at86rf230_write_subreg(lp, SR_IEEE_ADDR_6, filt->ieee_addr[1]);
at86rf230_write_subreg(lp, SR_IEEE_ADDR_7, filt->ieee_addr[0]);
}
if (changed & IEEE802515_AFILT_PANC_CHANGED) {
dev_vdbg(&lp->spi->dev,
"at86rf230_set_hw_addr_filt called for panc change\n");
if (filt->pan_coord)
at86rf230_write_subreg(lp, SR_AACK_I_AM_COORD, 1);
else
at86rf230_write_subreg(lp, SR_AACK_I_AM_COORD, 0);
}
return 0;
}
static struct ieee802154_ops at86rf230_ops = {
.owner = THIS_MODULE,
.xmit = at86rf230_xmit,
.ed = at86rf230_ed,
.set_channel = at86rf230_channel,
.start = at86rf230_start,
.stop = at86rf230_stop,
.set_hw_addr_filt = at86rf230_set_hw_addr_filt,
};
static void at86rf230_irqwork(struct work_struct *work)
{
struct at86rf230_local *lp =
container_of(work, struct at86rf230_local, irqwork);
u8 status = 0, val;
int rc;
unsigned long flags;
rc = at86rf230_read_subreg(lp, RG_IRQ_STATUS, 0xff, 0, &val);
status |= val;
status &= ~IRQ_PLL_LOCK; /* ignore */
status &= ~IRQ_RX_START; /* ignore */
status &= ~IRQ_AMI; /* ignore */
status &= ~IRQ_TRX_UR; /* FIXME: possibly handle ???*/
if (status & IRQ_TRX_END) {
spin_lock_irqsave(&lp->lock, flags);
status &= ~IRQ_TRX_END;
if (lp->is_tx) {
lp->is_tx = 0;
spin_unlock_irqrestore(&lp->lock, flags);
complete(&lp->tx_complete);
} else {
spin_unlock_irqrestore(&lp->lock, flags);
at86rf230_rx(lp);
}
}
spin_lock_irqsave(&lp->lock, flags);
lp->irq_busy = 0;
spin_unlock_irqrestore(&lp->lock, flags);
}
static void at86rf230_irqwork_level(struct work_struct *work)
{
struct at86rf230_local *lp =
container_of(work, struct at86rf230_local, irqwork);
at86rf230_irqwork(work);
enable_irq(lp->spi->irq);
}
static irqreturn_t at86rf230_isr(int irq, void *data)
{
struct at86rf230_local *lp = data;
spin_lock(&lp->lock);
lp->irq_busy = 1;
spin_unlock(&lp->lock);
schedule_work(&lp->irqwork);
return IRQ_HANDLED;
}
static irqreturn_t at86rf230_isr_level(int irq, void *data)
{
disable_irq_nosync(irq);
return at86rf230_isr(irq, data);
}
static int at86rf230_irq_polarity(struct at86rf230_local *lp, int pol)
{
return at86rf230_write_subreg(lp, SR_IRQ_POLARITY, pol);
}
static int at86rf230_hw_init(struct at86rf230_local *lp)
{
struct at86rf230_platform_data *pdata = lp->spi->dev.platform_data;
int rc, irq_pol;
u8 status;
rc = at86rf230_read_subreg(lp, SR_TRX_STATUS, &status);
if (rc)
return rc;
dev_info(&lp->spi->dev, "Status: %02x\n", status);
if (status == STATE_P_ON) {
rc = at86rf230_write_subreg(lp, SR_TRX_CMD, STATE_TRX_OFF);
if (rc)
return rc;
msleep(1);
rc = at86rf230_read_subreg(lp, SR_TRX_STATUS, &status);
if (rc)
return rc;
dev_info(&lp->spi->dev, "Status: %02x\n", status);
}
/* configure irq polarity, defaults to high active */
if (pdata->irq_type & (IRQF_TRIGGER_FALLING | IRQF_TRIGGER_LOW))
irq_pol = IRQ_ACTIVE_LOW;
else
irq_pol = IRQ_ACTIVE_HIGH;
rc = at86rf230_irq_polarity(lp, irq_pol);
if (rc)
return rc;
rc = at86rf230_write_subreg(lp, SR_IRQ_MASK, IRQ_TRX_END);
if (rc)
return rc;
/* CLKM changes are applied immediately */
rc = at86rf230_write_subreg(lp, SR_CLKM_SHA_SEL, 0x00);
if (rc)
return rc;
/* Turn CLKM Off */
rc = at86rf230_write_subreg(lp, SR_CLKM_CTRL, 0x00);
if (rc)
return rc;
/* Wait the next SLEEP cycle */
msleep(100);
rc = at86rf230_write_subreg(lp, SR_TRX_CMD, STATE_TX_ON);
if (rc)
return rc;
msleep(1);
rc = at86rf230_read_subreg(lp, SR_TRX_STATUS, &status);
if (rc)
return rc;
dev_info(&lp->spi->dev, "Status: %02x\n", status);
rc = at86rf230_read_subreg(lp, SR_DVDD_OK, &status);
if (rc)
return rc;
if (!status) {
dev_err(&lp->spi->dev, "DVDD error\n");
return -EINVAL;
}
rc = at86rf230_read_subreg(lp, SR_AVDD_OK, &status);
if (rc)
return rc;
if (!status) {
dev_err(&lp->spi->dev, "AVDD error\n");
return -EINVAL;
}
return 0;
}
static void at86rf230_fill_data(struct spi_device *spi)
{
struct at86rf230_local *lp = spi_get_drvdata(spi);
struct at86rf230_platform_data *pdata = spi->dev.platform_data;
lp->rstn = pdata->rstn;
lp->slp_tr = pdata->slp_tr;
lp->dig2 = pdata->dig2;
}
static int at86rf230_probe(struct spi_device *spi)
{
struct at86rf230_platform_data *pdata;
struct ieee802154_dev *dev;
struct at86rf230_local *lp;
u8 man_id_0, man_id_1, status;
irq_handler_t irq_handler;
work_func_t irq_worker;
int rc, supported = 0;
const char *chip;
if (!spi->irq) {
dev_err(&spi->dev, "no IRQ specified\n");
return -EINVAL;
}
pdata = spi->dev.platform_data;
if (!pdata) {
dev_err(&spi->dev, "no platform_data\n");
return -EINVAL;
}
dev = ieee802154_alloc_device(sizeof(*lp), &at86rf230_ops);
if (!dev)
return -ENOMEM;
lp = dev->priv;
lp->dev = dev;
lp->spi = spi;
dev->parent = &spi->dev;
dev->extra_tx_headroom = 0;
/* We do support only 2.4 Ghz */
dev->phy->channels_supported[0] = 0x7FFF800;
dev->flags = IEEE802154_HW_OMIT_CKSUM;
if (pdata->irq_type & (IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING)) {
irq_worker = at86rf230_irqwork;
irq_handler = at86rf230_isr;
} else {
irq_worker = at86rf230_irqwork_level;
irq_handler = at86rf230_isr_level;
}
mutex_init(&lp->bmux);
INIT_WORK(&lp->irqwork, irq_worker);
spin_lock_init(&lp->lock);
init_completion(&lp->tx_complete);
spi_set_drvdata(spi, lp);
at86rf230_fill_data(spi);
rc = gpio_request(lp->rstn, "rstn");
if (rc)
goto err_rstn;
if (gpio_is_valid(lp->slp_tr)) {
rc = gpio_request(lp->slp_tr, "slp_tr");
if (rc)
goto err_slp_tr;
}
rc = gpio_direction_output(lp->rstn, 1);
if (rc)
goto err_gpio_dir;
if (gpio_is_valid(lp->slp_tr)) {
rc = gpio_direction_output(lp->slp_tr, 0);
if (rc)
goto err_gpio_dir;
}
/* Reset */
msleep(1);
gpio_set_value(lp->rstn, 0);
msleep(1);
gpio_set_value(lp->rstn, 1);
msleep(1);
rc = at86rf230_read_subreg(lp, SR_MAN_ID_0, &man_id_0);
if (rc)
goto err_gpio_dir;
rc = at86rf230_read_subreg(lp, SR_MAN_ID_1, &man_id_1);
if (rc)
goto err_gpio_dir;
if (man_id_1 != 0x00 || man_id_0 != 0x1f) {
dev_err(&spi->dev, "Non-Atmel dev found (MAN_ID %02x %02x)\n",
man_id_1, man_id_0);
rc = -EINVAL;
goto err_gpio_dir;
}
rc = at86rf230_read_subreg(lp, SR_PART_NUM, &lp->part);
if (rc)
goto err_gpio_dir;
rc = at86rf230_read_subreg(lp, SR_VERSION_NUM, &lp->vers);
if (rc)
goto err_gpio_dir;
switch (lp->part) {
case 2:
chip = "at86rf230";
/* supported = 1; FIXME: should be easy to support; */
break;
case 3:
chip = "at86rf231";
supported = 1;
break;
default:
chip = "UNKNOWN";
break;
}
dev_info(&spi->dev, "Detected %s chip version %d\n", chip, lp->vers);
if (!supported) {
rc = -ENOTSUPP;
goto err_gpio_dir;
}
rc = at86rf230_hw_init(lp);
if (rc)
goto err_gpio_dir;
rc = request_irq(spi->irq, irq_handler,
IRQF_SHARED | pdata->irq_type,
dev_name(&spi->dev), lp);
if (rc)
goto err_gpio_dir;
/* Read irq status register to reset irq line */
rc = at86rf230_read_subreg(lp, RG_IRQ_STATUS, 0xff, 0, &status);
if (rc)
goto err_irq;
rc = ieee802154_register_device(lp->dev);
if (rc)
goto err_irq;
return rc;
err_irq:
free_irq(spi->irq, lp);
flush_work(&lp->irqwork);
err_gpio_dir:
if (gpio_is_valid(lp->slp_tr))
gpio_free(lp->slp_tr);
err_slp_tr:
gpio_free(lp->rstn);
err_rstn:
spi_set_drvdata(spi, NULL);
mutex_destroy(&lp->bmux);
ieee802154_free_device(lp->dev);
return rc;
}
static int at86rf230_remove(struct spi_device *spi)
{
struct at86rf230_local *lp = spi_get_drvdata(spi);
ieee802154_unregister_device(lp->dev);
free_irq(spi->irq, lp);
flush_work(&lp->irqwork);
if (gpio_is_valid(lp->slp_tr))
gpio_free(lp->slp_tr);
gpio_free(lp->rstn);
spi_set_drvdata(spi, NULL);
mutex_destroy(&lp->bmux);
ieee802154_free_device(lp->dev);
dev_dbg(&spi->dev, "unregistered at86rf230\n");
return 0;
}
static struct spi_driver at86rf230_driver = {
.driver = {
.name = "at86rf230",
.owner = THIS_MODULE,
},
.probe = at86rf230_probe,
.remove = at86rf230_remove,
};
module_spi_driver(at86rf230_driver);
MODULE_DESCRIPTION("AT86RF230 Transceiver Driver");
MODULE_LICENSE("GPL v2");
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