/* Driver for TI CC2520 802.15.4 Wireless-PAN Networking controller
|
*
|
* Copyright (C) 2014 Varka Bhadram <varkab@cdac.in>
|
* Md.Jamal Mohiuddin <mjmohiuddin@cdac.in>
|
* P Sowjanya <sowjanyap@cdac.in>
|
*
|
* This program is free software; you can redistribute it and/or modify
|
* it under the terms of the GNU General Public License as published by
|
* the Free Software Foundation; either version 2 of the License, or
|
* (at your option) any later version.
|
*
|
*/
|
#include <linux/kernel.h>
|
#include <linux/module.h>
|
#include <linux/gpio.h>
|
#include <linux/delay.h>
|
#include <linux/spi/spi.h>
|
#include <linux/spi/cc2520.h>
|
#include <linux/workqueue.h>
|
#include <linux/interrupt.h>
|
#include <linux/skbuff.h>
|
#include <linux/of_gpio.h>
|
#include <linux/ieee802154.h>
|
#include <linux/crc-ccitt.h>
|
#include <asm/unaligned.h>
|
|
#include <net/mac802154.h>
|
#include <net/cfg802154.h>
|
|
#define SPI_COMMAND_BUFFER 3
|
#define HIGH 1
|
#define LOW 0
|
#define STATE_IDLE 0
|
#define RSSI_VALID 0
|
#define RSSI_OFFSET 78
|
|
#define CC2520_RAM_SIZE 640
|
#define CC2520_FIFO_SIZE 128
|
|
#define CC2520RAM_TXFIFO 0x100
|
#define CC2520RAM_RXFIFO 0x180
|
#define CC2520RAM_IEEEADDR 0x3EA
|
#define CC2520RAM_PANID 0x3F2
|
#define CC2520RAM_SHORTADDR 0x3F4
|
|
#define CC2520_FREG_MASK 0x3F
|
|
/* status byte values */
|
#define CC2520_STATUS_XOSC32M_STABLE BIT(7)
|
#define CC2520_STATUS_RSSI_VALID BIT(6)
|
#define CC2520_STATUS_TX_UNDERFLOW BIT(3)
|
|
/* IEEE-802.15.4 defined constants (2.4 GHz logical channels) */
|
#define CC2520_MINCHANNEL 11
|
#define CC2520_MAXCHANNEL 26
|
#define CC2520_CHANNEL_SPACING 5
|
|
/* command strobes */
|
#define CC2520_CMD_SNOP 0x00
|
#define CC2520_CMD_IBUFLD 0x02
|
#define CC2520_CMD_SIBUFEX 0x03
|
#define CC2520_CMD_SSAMPLECCA 0x04
|
#define CC2520_CMD_SRES 0x0f
|
#define CC2520_CMD_MEMORY_MASK 0x0f
|
#define CC2520_CMD_MEMORY_READ 0x10
|
#define CC2520_CMD_MEMORY_WRITE 0x20
|
#define CC2520_CMD_RXBUF 0x30
|
#define CC2520_CMD_RXBUFCP 0x38
|
#define CC2520_CMD_RXBUFMOV 0x32
|
#define CC2520_CMD_TXBUF 0x3A
|
#define CC2520_CMD_TXBUFCP 0x3E
|
#define CC2520_CMD_RANDOM 0x3C
|
#define CC2520_CMD_SXOSCON 0x40
|
#define CC2520_CMD_STXCAL 0x41
|
#define CC2520_CMD_SRXON 0x42
|
#define CC2520_CMD_STXON 0x43
|
#define CC2520_CMD_STXONCCA 0x44
|
#define CC2520_CMD_SRFOFF 0x45
|
#define CC2520_CMD_SXOSCOFF 0x46
|
#define CC2520_CMD_SFLUSHRX 0x47
|
#define CC2520_CMD_SFLUSHTX 0x48
|
#define CC2520_CMD_SACK 0x49
|
#define CC2520_CMD_SACKPEND 0x4A
|
#define CC2520_CMD_SNACK 0x4B
|
#define CC2520_CMD_SRXMASKBITSET 0x4C
|
#define CC2520_CMD_SRXMASKBITCLR 0x4D
|
#define CC2520_CMD_RXMASKAND 0x4E
|
#define CC2520_CMD_RXMASKOR 0x4F
|
#define CC2520_CMD_MEMCP 0x50
|
#define CC2520_CMD_MEMCPR 0x52
|
#define CC2520_CMD_MEMXCP 0x54
|
#define CC2520_CMD_MEMXWR 0x56
|
#define CC2520_CMD_BCLR 0x58
|
#define CC2520_CMD_BSET 0x59
|
#define CC2520_CMD_CTR_UCTR 0x60
|
#define CC2520_CMD_CBCMAC 0x64
|
#define CC2520_CMD_UCBCMAC 0x66
|
#define CC2520_CMD_CCM 0x68
|
#define CC2520_CMD_UCCM 0x6A
|
#define CC2520_CMD_ECB 0x70
|
#define CC2520_CMD_ECBO 0x72
|
#define CC2520_CMD_ECBX 0x74
|
#define CC2520_CMD_INC 0x78
|
#define CC2520_CMD_ABORT 0x7F
|
#define CC2520_CMD_REGISTER_READ 0x80
|
#define CC2520_CMD_REGISTER_WRITE 0xC0
|
|
/* status registers */
|
#define CC2520_CHIPID 0x40
|
#define CC2520_VERSION 0x42
|
#define CC2520_EXTCLOCK 0x44
|
#define CC2520_MDMCTRL0 0x46
|
#define CC2520_MDMCTRL1 0x47
|
#define CC2520_FREQEST 0x48
|
#define CC2520_RXCTRL 0x4A
|
#define CC2520_FSCTRL 0x4C
|
#define CC2520_FSCAL0 0x4E
|
#define CC2520_FSCAL1 0x4F
|
#define CC2520_FSCAL2 0x50
|
#define CC2520_FSCAL3 0x51
|
#define CC2520_AGCCTRL0 0x52
|
#define CC2520_AGCCTRL1 0x53
|
#define CC2520_AGCCTRL2 0x54
|
#define CC2520_AGCCTRL3 0x55
|
#define CC2520_ADCTEST0 0x56
|
#define CC2520_ADCTEST1 0x57
|
#define CC2520_ADCTEST2 0x58
|
#define CC2520_MDMTEST0 0x5A
|
#define CC2520_MDMTEST1 0x5B
|
#define CC2520_DACTEST0 0x5C
|
#define CC2520_DACTEST1 0x5D
|
#define CC2520_ATEST 0x5E
|
#define CC2520_DACTEST2 0x5F
|
#define CC2520_PTEST0 0x60
|
#define CC2520_PTEST1 0x61
|
#define CC2520_RESERVED 0x62
|
#define CC2520_DPUBIST 0x7A
|
#define CC2520_ACTBIST 0x7C
|
#define CC2520_RAMBIST 0x7E
|
|
/* frame registers */
|
#define CC2520_FRMFILT0 0x00
|
#define CC2520_FRMFILT1 0x01
|
#define CC2520_SRCMATCH 0x02
|
#define CC2520_SRCSHORTEN0 0x04
|
#define CC2520_SRCSHORTEN1 0x05
|
#define CC2520_SRCSHORTEN2 0x06
|
#define CC2520_SRCEXTEN0 0x08
|
#define CC2520_SRCEXTEN1 0x09
|
#define CC2520_SRCEXTEN2 0x0A
|
#define CC2520_FRMCTRL0 0x0C
|
#define CC2520_FRMCTRL1 0x0D
|
#define CC2520_RXENABLE0 0x0E
|
#define CC2520_RXENABLE1 0x0F
|
#define CC2520_EXCFLAG0 0x10
|
#define CC2520_EXCFLAG1 0x11
|
#define CC2520_EXCFLAG2 0x12
|
#define CC2520_EXCMASKA0 0x14
|
#define CC2520_EXCMASKA1 0x15
|
#define CC2520_EXCMASKA2 0x16
|
#define CC2520_EXCMASKB0 0x18
|
#define CC2520_EXCMASKB1 0x19
|
#define CC2520_EXCMASKB2 0x1A
|
#define CC2520_EXCBINDX0 0x1C
|
#define CC2520_EXCBINDX1 0x1D
|
#define CC2520_EXCBINDY0 0x1E
|
#define CC2520_EXCBINDY1 0x1F
|
#define CC2520_GPIOCTRL0 0x20
|
#define CC2520_GPIOCTRL1 0x21
|
#define CC2520_GPIOCTRL2 0x22
|
#define CC2520_GPIOCTRL3 0x23
|
#define CC2520_GPIOCTRL4 0x24
|
#define CC2520_GPIOCTRL5 0x25
|
#define CC2520_GPIOPOLARITY 0x26
|
#define CC2520_GPIOCTRL 0x28
|
#define CC2520_DPUCON 0x2A
|
#define CC2520_DPUSTAT 0x2C
|
#define CC2520_FREQCTRL 0x2E
|
#define CC2520_FREQTUNE 0x2F
|
#define CC2520_TXPOWER 0x30
|
#define CC2520_TXCTRL 0x31
|
#define CC2520_FSMSTAT0 0x32
|
#define CC2520_FSMSTAT1 0x33
|
#define CC2520_FIFOPCTRL 0x34
|
#define CC2520_FSMCTRL 0x35
|
#define CC2520_CCACTRL0 0x36
|
#define CC2520_CCACTRL1 0x37
|
#define CC2520_RSSI 0x38
|
#define CC2520_RSSISTAT 0x39
|
#define CC2520_RXFIRST 0x3C
|
#define CC2520_RXFIFOCNT 0x3E
|
#define CC2520_TXFIFOCNT 0x3F
|
|
/* CC2520_FRMFILT0 */
|
#define FRMFILT0_FRAME_FILTER_EN BIT(0)
|
#define FRMFILT0_PAN_COORDINATOR BIT(1)
|
|
/* CC2520_FRMCTRL0 */
|
#define FRMCTRL0_AUTOACK BIT(5)
|
#define FRMCTRL0_AUTOCRC BIT(6)
|
|
/* CC2520_FRMCTRL1 */
|
#define FRMCTRL1_SET_RXENMASK_ON_TX BIT(0)
|
#define FRMCTRL1_IGNORE_TX_UNDERF BIT(1)
|
|
/* Driver private information */
|
struct cc2520_private {
|
struct spi_device *spi; /* SPI device structure */
|
struct ieee802154_hw *hw; /* IEEE-802.15.4 device */
|
u8 *buf; /* SPI TX/Rx data buffer */
|
struct mutex buffer_mutex; /* SPI buffer mutex */
|
bool is_tx; /* Flag for sync b/w Tx and Rx */
|
bool amplified; /* Flag for CC2591 */
|
int fifo_pin; /* FIFO GPIO pin number */
|
struct work_struct fifop_irqwork;/* Workqueue for FIFOP */
|
spinlock_t lock; /* Lock for is_tx*/
|
struct completion tx_complete; /* Work completion for Tx */
|
bool promiscuous; /* Flag for promiscuous mode */
|
};
|
|
/* Generic Functions */
|
static int
|
cc2520_cmd_strobe(struct cc2520_private *priv, u8 cmd)
|
{
|
int ret;
|
u8 status = 0xff;
|
struct spi_message msg;
|
struct spi_transfer xfer = {
|
.len = 0,
|
.tx_buf = priv->buf,
|
.rx_buf = priv->buf,
|
};
|
|
spi_message_init(&msg);
|
spi_message_add_tail(&xfer, &msg);
|
|
mutex_lock(&priv->buffer_mutex);
|
priv->buf[xfer.len++] = cmd;
|
dev_vdbg(&priv->spi->dev,
|
"command strobe buf[0] = %02x\n",
|
priv->buf[0]);
|
|
ret = spi_sync(priv->spi, &msg);
|
if (!ret)
|
status = priv->buf[0];
|
dev_vdbg(&priv->spi->dev,
|
"buf[0] = %02x\n", priv->buf[0]);
|
mutex_unlock(&priv->buffer_mutex);
|
|
return ret;
|
}
|
|
static int
|
cc2520_get_status(struct cc2520_private *priv, u8 *status)
|
{
|
int ret;
|
struct spi_message msg;
|
struct spi_transfer xfer = {
|
.len = 0,
|
.tx_buf = priv->buf,
|
.rx_buf = priv->buf,
|
};
|
|
spi_message_init(&msg);
|
spi_message_add_tail(&xfer, &msg);
|
|
mutex_lock(&priv->buffer_mutex);
|
priv->buf[xfer.len++] = CC2520_CMD_SNOP;
|
dev_vdbg(&priv->spi->dev,
|
"get status command buf[0] = %02x\n", priv->buf[0]);
|
|
ret = spi_sync(priv->spi, &msg);
|
if (!ret)
|
*status = priv->buf[0];
|
dev_vdbg(&priv->spi->dev,
|
"buf[0] = %02x\n", priv->buf[0]);
|
mutex_unlock(&priv->buffer_mutex);
|
|
return ret;
|
}
|
|
static int
|
cc2520_write_register(struct cc2520_private *priv, u8 reg, u8 value)
|
{
|
int status;
|
struct spi_message msg;
|
struct spi_transfer xfer = {
|
.len = 0,
|
.tx_buf = priv->buf,
|
.rx_buf = priv->buf,
|
};
|
|
spi_message_init(&msg);
|
spi_message_add_tail(&xfer, &msg);
|
|
mutex_lock(&priv->buffer_mutex);
|
|
if (reg <= CC2520_FREG_MASK) {
|
priv->buf[xfer.len++] = CC2520_CMD_REGISTER_WRITE | reg;
|
priv->buf[xfer.len++] = value;
|
} else {
|
priv->buf[xfer.len++] = CC2520_CMD_MEMORY_WRITE;
|
priv->buf[xfer.len++] = reg;
|
priv->buf[xfer.len++] = value;
|
}
|
status = spi_sync(priv->spi, &msg);
|
if (msg.status)
|
status = msg.status;
|
|
mutex_unlock(&priv->buffer_mutex);
|
|
return status;
|
}
|
|
static int
|
cc2520_write_ram(struct cc2520_private *priv, u16 reg, u8 len, u8 *data)
|
{
|
int status;
|
struct spi_message msg;
|
struct spi_transfer xfer_head = {
|
.len = 0,
|
.tx_buf = priv->buf,
|
.rx_buf = priv->buf,
|
};
|
|
struct spi_transfer xfer_buf = {
|
.len = len,
|
.tx_buf = data,
|
};
|
|
mutex_lock(&priv->buffer_mutex);
|
priv->buf[xfer_head.len++] = (CC2520_CMD_MEMORY_WRITE |
|
((reg >> 8) & 0xff));
|
priv->buf[xfer_head.len++] = reg & 0xff;
|
|
spi_message_init(&msg);
|
spi_message_add_tail(&xfer_head, &msg);
|
spi_message_add_tail(&xfer_buf, &msg);
|
|
status = spi_sync(priv->spi, &msg);
|
dev_dbg(&priv->spi->dev, "spi status = %d\n", status);
|
if (msg.status)
|
status = msg.status;
|
|
mutex_unlock(&priv->buffer_mutex);
|
return status;
|
}
|
|
static int
|
cc2520_read_register(struct cc2520_private *priv, u8 reg, u8 *data)
|
{
|
int status;
|
struct spi_message msg;
|
struct spi_transfer xfer1 = {
|
.len = 0,
|
.tx_buf = priv->buf,
|
.rx_buf = priv->buf,
|
};
|
|
struct spi_transfer xfer2 = {
|
.len = 1,
|
.rx_buf = data,
|
};
|
|
spi_message_init(&msg);
|
spi_message_add_tail(&xfer1, &msg);
|
spi_message_add_tail(&xfer2, &msg);
|
|
mutex_lock(&priv->buffer_mutex);
|
priv->buf[xfer1.len++] = CC2520_CMD_MEMORY_READ;
|
priv->buf[xfer1.len++] = reg;
|
|
status = spi_sync(priv->spi, &msg);
|
dev_dbg(&priv->spi->dev,
|
"spi status = %d\n", status);
|
if (msg.status)
|
status = msg.status;
|
|
mutex_unlock(&priv->buffer_mutex);
|
|
return status;
|
}
|
|
static int
|
cc2520_write_txfifo(struct cc2520_private *priv, u8 pkt_len, u8 *data, u8 len)
|
{
|
int status;
|
|
/* length byte must include FCS even
|
* if it is calculated in the hardware
|
*/
|
int len_byte = pkt_len;
|
|
struct spi_message msg;
|
|
struct spi_transfer xfer_head = {
|
.len = 0,
|
.tx_buf = priv->buf,
|
.rx_buf = priv->buf,
|
};
|
struct spi_transfer xfer_len = {
|
.len = 1,
|
.tx_buf = &len_byte,
|
};
|
struct spi_transfer xfer_buf = {
|
.len = len,
|
.tx_buf = data,
|
};
|
|
spi_message_init(&msg);
|
spi_message_add_tail(&xfer_head, &msg);
|
spi_message_add_tail(&xfer_len, &msg);
|
spi_message_add_tail(&xfer_buf, &msg);
|
|
mutex_lock(&priv->buffer_mutex);
|
priv->buf[xfer_head.len++] = CC2520_CMD_TXBUF;
|
dev_vdbg(&priv->spi->dev,
|
"TX_FIFO cmd buf[0] = %02x\n", priv->buf[0]);
|
|
status = spi_sync(priv->spi, &msg);
|
dev_vdbg(&priv->spi->dev, "status = %d\n", status);
|
if (msg.status)
|
status = msg.status;
|
dev_vdbg(&priv->spi->dev, "status = %d\n", status);
|
dev_vdbg(&priv->spi->dev, "buf[0] = %02x\n", priv->buf[0]);
|
mutex_unlock(&priv->buffer_mutex);
|
|
return status;
|
}
|
|
static int
|
cc2520_read_rxfifo(struct cc2520_private *priv, u8 *data, u8 len)
|
{
|
int status;
|
struct spi_message msg;
|
|
struct spi_transfer xfer_head = {
|
.len = 0,
|
.tx_buf = priv->buf,
|
.rx_buf = priv->buf,
|
};
|
struct spi_transfer xfer_buf = {
|
.len = len,
|
.rx_buf = data,
|
};
|
|
spi_message_init(&msg);
|
spi_message_add_tail(&xfer_head, &msg);
|
spi_message_add_tail(&xfer_buf, &msg);
|
|
mutex_lock(&priv->buffer_mutex);
|
priv->buf[xfer_head.len++] = CC2520_CMD_RXBUF;
|
|
dev_vdbg(&priv->spi->dev, "read rxfifo buf[0] = %02x\n", priv->buf[0]);
|
dev_vdbg(&priv->spi->dev, "buf[1] = %02x\n", priv->buf[1]);
|
|
status = spi_sync(priv->spi, &msg);
|
dev_vdbg(&priv->spi->dev, "status = %d\n", status);
|
if (msg.status)
|
status = msg.status;
|
dev_vdbg(&priv->spi->dev, "status = %d\n", status);
|
dev_vdbg(&priv->spi->dev,
|
"return status buf[0] = %02x\n", priv->buf[0]);
|
dev_vdbg(&priv->spi->dev, "length buf[1] = %02x\n", priv->buf[1]);
|
|
mutex_unlock(&priv->buffer_mutex);
|
|
return status;
|
}
|
|
static int cc2520_start(struct ieee802154_hw *hw)
|
{
|
return cc2520_cmd_strobe(hw->priv, CC2520_CMD_SRXON);
|
}
|
|
static void cc2520_stop(struct ieee802154_hw *hw)
|
{
|
cc2520_cmd_strobe(hw->priv, CC2520_CMD_SRFOFF);
|
}
|
|
static int
|
cc2520_tx(struct ieee802154_hw *hw, struct sk_buff *skb)
|
{
|
struct cc2520_private *priv = hw->priv;
|
unsigned long flags;
|
int rc;
|
u8 status = 0;
|
u8 pkt_len;
|
|
/* In promiscuous mode we disable AUTOCRC so we can get the raw CRC
|
* values on RX. This means we need to manually add the CRC on TX.
|
*/
|
if (priv->promiscuous) {
|
u16 crc = crc_ccitt(0, skb->data, skb->len);
|
|
put_unaligned_le16(crc, skb_put(skb, 2));
|
pkt_len = skb->len;
|
} else {
|
pkt_len = skb->len + 2;
|
}
|
|
rc = cc2520_cmd_strobe(priv, CC2520_CMD_SFLUSHTX);
|
if (rc)
|
goto err_tx;
|
|
rc = cc2520_write_txfifo(priv, pkt_len, skb->data, skb->len);
|
if (rc)
|
goto err_tx;
|
|
rc = cc2520_get_status(priv, &status);
|
if (rc)
|
goto err_tx;
|
|
if (status & CC2520_STATUS_TX_UNDERFLOW) {
|
dev_err(&priv->spi->dev, "cc2520 tx underflow exception\n");
|
goto err_tx;
|
}
|
|
spin_lock_irqsave(&priv->lock, flags);
|
WARN_ON(priv->is_tx);
|
priv->is_tx = 1;
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
rc = cc2520_cmd_strobe(priv, CC2520_CMD_STXONCCA);
|
if (rc)
|
goto err;
|
|
rc = wait_for_completion_interruptible(&priv->tx_complete);
|
if (rc < 0)
|
goto err;
|
|
cc2520_cmd_strobe(priv, CC2520_CMD_SFLUSHTX);
|
cc2520_cmd_strobe(priv, CC2520_CMD_SRXON);
|
|
return rc;
|
err:
|
spin_lock_irqsave(&priv->lock, flags);
|
priv->is_tx = 0;
|
spin_unlock_irqrestore(&priv->lock, flags);
|
err_tx:
|
return rc;
|
}
|
|
static int cc2520_rx(struct cc2520_private *priv)
|
{
|
u8 len = 0, lqi = 0, bytes = 1;
|
struct sk_buff *skb;
|
|
/* Read single length byte from the radio. */
|
cc2520_read_rxfifo(priv, &len, bytes);
|
|
if (!ieee802154_is_valid_psdu_len(len)) {
|
/* Corrupted frame received, clear frame buffer by
|
* reading entire buffer.
|
*/
|
dev_dbg(&priv->spi->dev, "corrupted frame received\n");
|
len = IEEE802154_MTU;
|
}
|
|
skb = dev_alloc_skb(len);
|
if (!skb)
|
return -ENOMEM;
|
|
if (cc2520_read_rxfifo(priv, skb_put(skb, len), len)) {
|
dev_dbg(&priv->spi->dev, "frame reception failed\n");
|
kfree_skb(skb);
|
return -EINVAL;
|
}
|
|
/* In promiscuous mode, we configure the radio to include the
|
* CRC (AUTOCRC==0) and we pass on the packet unconditionally. If not
|
* in promiscuous mode, we check the CRC here, but leave the
|
* RSSI/LQI/CRC_OK bytes as they will get removed in the mac layer.
|
*/
|
if (!priv->promiscuous) {
|
bool crc_ok;
|
|
/* Check if the CRC is valid. With AUTOCRC set, the most
|
* significant bit of the last byte returned from the CC2520
|
* is CRC_OK flag. See section 20.3.4 of the datasheet.
|
*/
|
crc_ok = skb->data[len - 1] & BIT(7);
|
|
/* If we failed CRC drop the packet in the driver layer. */
|
if (!crc_ok) {
|
dev_dbg(&priv->spi->dev, "CRC check failed\n");
|
kfree_skb(skb);
|
return -EINVAL;
|
}
|
|
/* To calculate LQI, the lower 7 bits of the last byte (the
|
* correlation value provided by the radio) must be scaled to
|
* the range 0-255. According to section 20.6, the correlation
|
* value ranges from 50-110. Ideally this would be calibrated
|
* per hardware design, but we use roughly the datasheet values
|
* to get close enough while avoiding floating point.
|
*/
|
lqi = skb->data[len - 1] & 0x7f;
|
if (lqi < 50)
|
lqi = 50;
|
else if (lqi > 113)
|
lqi = 113;
|
lqi = (lqi - 50) * 4;
|
}
|
|
ieee802154_rx_irqsafe(priv->hw, skb, lqi);
|
|
dev_vdbg(&priv->spi->dev, "RXFIFO: %x %x\n", len, lqi);
|
|
return 0;
|
}
|
|
static int
|
cc2520_ed(struct ieee802154_hw *hw, u8 *level)
|
{
|
struct cc2520_private *priv = hw->priv;
|
u8 status = 0xff;
|
u8 rssi;
|
int ret;
|
|
ret = cc2520_read_register(priv, CC2520_RSSISTAT, &status);
|
if (ret)
|
return ret;
|
|
if (status != RSSI_VALID)
|
return -EINVAL;
|
|
ret = cc2520_read_register(priv, CC2520_RSSI, &rssi);
|
if (ret)
|
return ret;
|
|
/* level = RSSI(rssi) - OFFSET [dBm] : offset is 76dBm */
|
*level = rssi - RSSI_OFFSET;
|
|
return 0;
|
}
|
|
static int
|
cc2520_set_channel(struct ieee802154_hw *hw, u8 page, u8 channel)
|
{
|
struct cc2520_private *priv = hw->priv;
|
int ret;
|
|
dev_dbg(&priv->spi->dev, "trying to set channel\n");
|
|
WARN_ON(page != 0);
|
WARN_ON(channel < CC2520_MINCHANNEL);
|
WARN_ON(channel > CC2520_MAXCHANNEL);
|
|
ret = cc2520_write_register(priv, CC2520_FREQCTRL,
|
11 + 5 * (channel - 11));
|
|
return ret;
|
}
|
|
static int
|
cc2520_filter(struct ieee802154_hw *hw,
|
struct ieee802154_hw_addr_filt *filt, unsigned long changed)
|
{
|
struct cc2520_private *priv = hw->priv;
|
int ret = 0;
|
|
if (changed & IEEE802154_AFILT_PANID_CHANGED) {
|
u16 panid = le16_to_cpu(filt->pan_id);
|
|
dev_vdbg(&priv->spi->dev, "%s called for pan id\n", __func__);
|
ret = cc2520_write_ram(priv, CC2520RAM_PANID,
|
sizeof(panid), (u8 *)&panid);
|
}
|
|
if (changed & IEEE802154_AFILT_IEEEADDR_CHANGED) {
|
dev_vdbg(&priv->spi->dev,
|
"%s called for IEEE addr\n", __func__);
|
ret = cc2520_write_ram(priv, CC2520RAM_IEEEADDR,
|
sizeof(filt->ieee_addr),
|
(u8 *)&filt->ieee_addr);
|
}
|
|
if (changed & IEEE802154_AFILT_SADDR_CHANGED) {
|
u16 addr = le16_to_cpu(filt->short_addr);
|
|
dev_vdbg(&priv->spi->dev, "%s called for saddr\n", __func__);
|
ret = cc2520_write_ram(priv, CC2520RAM_SHORTADDR,
|
sizeof(addr), (u8 *)&addr);
|
}
|
|
if (changed & IEEE802154_AFILT_PANC_CHANGED) {
|
u8 frmfilt0;
|
|
dev_vdbg(&priv->spi->dev,
|
"%s called for panc change\n", __func__);
|
|
cc2520_read_register(priv, CC2520_FRMFILT0, &frmfilt0);
|
|
if (filt->pan_coord)
|
frmfilt0 |= FRMFILT0_PAN_COORDINATOR;
|
else
|
frmfilt0 &= ~FRMFILT0_PAN_COORDINATOR;
|
|
ret = cc2520_write_register(priv, CC2520_FRMFILT0, frmfilt0);
|
}
|
|
return ret;
|
}
|
|
static inline int cc2520_set_tx_power(struct cc2520_private *priv, s32 mbm)
|
{
|
u8 power;
|
|
switch (mbm) {
|
case 500:
|
power = 0xF7;
|
break;
|
case 300:
|
power = 0xF2;
|
break;
|
case 200:
|
power = 0xAB;
|
break;
|
case 100:
|
power = 0x13;
|
break;
|
case 0:
|
power = 0x32;
|
break;
|
case -200:
|
power = 0x81;
|
break;
|
case -400:
|
power = 0x88;
|
break;
|
case -700:
|
power = 0x2C;
|
break;
|
case -1800:
|
power = 0x03;
|
break;
|
default:
|
return -EINVAL;
|
}
|
|
return cc2520_write_register(priv, CC2520_TXPOWER, power);
|
}
|
|
static inline int cc2520_cc2591_set_tx_power(struct cc2520_private *priv,
|
s32 mbm)
|
{
|
u8 power;
|
|
switch (mbm) {
|
case 1700:
|
power = 0xF9;
|
break;
|
case 1600:
|
power = 0xF0;
|
break;
|
case 1400:
|
power = 0xA0;
|
break;
|
case 1100:
|
power = 0x2C;
|
break;
|
case -100:
|
power = 0x03;
|
break;
|
case -800:
|
power = 0x01;
|
break;
|
default:
|
return -EINVAL;
|
}
|
|
return cc2520_write_register(priv, CC2520_TXPOWER, power);
|
}
|
|
#define CC2520_MAX_TX_POWERS 0x8
|
static const s32 cc2520_powers[CC2520_MAX_TX_POWERS + 1] = {
|
500, 300, 200, 100, 0, -200, -400, -700, -1800,
|
};
|
|
#define CC2520_CC2591_MAX_TX_POWERS 0x5
|
static const s32 cc2520_cc2591_powers[CC2520_CC2591_MAX_TX_POWERS + 1] = {
|
1700, 1600, 1400, 1100, -100, -800,
|
};
|
|
static int
|
cc2520_set_txpower(struct ieee802154_hw *hw, s32 mbm)
|
{
|
struct cc2520_private *priv = hw->priv;
|
|
if (!priv->amplified)
|
return cc2520_set_tx_power(priv, mbm);
|
|
return cc2520_cc2591_set_tx_power(priv, mbm);
|
}
|
|
static int
|
cc2520_set_promiscuous_mode(struct ieee802154_hw *hw, bool on)
|
{
|
struct cc2520_private *priv = hw->priv;
|
u8 frmfilt0;
|
|
dev_dbg(&priv->spi->dev, "%s : mode %d\n", __func__, on);
|
|
priv->promiscuous = on;
|
|
cc2520_read_register(priv, CC2520_FRMFILT0, &frmfilt0);
|
|
if (on) {
|
/* Disable automatic ACK, automatic CRC, and frame filtering. */
|
cc2520_write_register(priv, CC2520_FRMCTRL0, 0);
|
frmfilt0 &= ~FRMFILT0_FRAME_FILTER_EN;
|
} else {
|
cc2520_write_register(priv, CC2520_FRMCTRL0, FRMCTRL0_AUTOACK |
|
FRMCTRL0_AUTOCRC);
|
frmfilt0 |= FRMFILT0_FRAME_FILTER_EN;
|
}
|
return cc2520_write_register(priv, CC2520_FRMFILT0, frmfilt0);
|
}
|
|
static const struct ieee802154_ops cc2520_ops = {
|
.owner = THIS_MODULE,
|
.start = cc2520_start,
|
.stop = cc2520_stop,
|
.xmit_sync = cc2520_tx,
|
.ed = cc2520_ed,
|
.set_channel = cc2520_set_channel,
|
.set_hw_addr_filt = cc2520_filter,
|
.set_txpower = cc2520_set_txpower,
|
.set_promiscuous_mode = cc2520_set_promiscuous_mode,
|
};
|
|
static int cc2520_register(struct cc2520_private *priv)
|
{
|
int ret = -ENOMEM;
|
|
priv->hw = ieee802154_alloc_hw(sizeof(*priv), &cc2520_ops);
|
if (!priv->hw)
|
goto err_ret;
|
|
priv->hw->priv = priv;
|
priv->hw->parent = &priv->spi->dev;
|
priv->hw->extra_tx_headroom = 0;
|
ieee802154_random_extended_addr(&priv->hw->phy->perm_extended_addr);
|
|
/* We do support only 2.4 Ghz */
|
priv->hw->phy->supported.channels[0] = 0x7FFF800;
|
priv->hw->flags = IEEE802154_HW_TX_OMIT_CKSUM | IEEE802154_HW_AFILT |
|
IEEE802154_HW_PROMISCUOUS;
|
|
priv->hw->phy->flags = WPAN_PHY_FLAG_TXPOWER;
|
|
if (!priv->amplified) {
|
priv->hw->phy->supported.tx_powers = cc2520_powers;
|
priv->hw->phy->supported.tx_powers_size = ARRAY_SIZE(cc2520_powers);
|
priv->hw->phy->transmit_power = priv->hw->phy->supported.tx_powers[4];
|
} else {
|
priv->hw->phy->supported.tx_powers = cc2520_cc2591_powers;
|
priv->hw->phy->supported.tx_powers_size = ARRAY_SIZE(cc2520_cc2591_powers);
|
priv->hw->phy->transmit_power = priv->hw->phy->supported.tx_powers[0];
|
}
|
|
priv->hw->phy->current_channel = 11;
|
|
dev_vdbg(&priv->spi->dev, "registered cc2520\n");
|
ret = ieee802154_register_hw(priv->hw);
|
if (ret)
|
goto err_free_device;
|
|
return 0;
|
|
err_free_device:
|
ieee802154_free_hw(priv->hw);
|
err_ret:
|
return ret;
|
}
|
|
static void cc2520_fifop_irqwork(struct work_struct *work)
|
{
|
struct cc2520_private *priv
|
= container_of(work, struct cc2520_private, fifop_irqwork);
|
|
dev_dbg(&priv->spi->dev, "fifop interrupt received\n");
|
|
if (gpio_get_value(priv->fifo_pin))
|
cc2520_rx(priv);
|
else
|
dev_dbg(&priv->spi->dev, "rxfifo overflow\n");
|
|
cc2520_cmd_strobe(priv, CC2520_CMD_SFLUSHRX);
|
cc2520_cmd_strobe(priv, CC2520_CMD_SFLUSHRX);
|
}
|
|
static irqreturn_t cc2520_fifop_isr(int irq, void *data)
|
{
|
struct cc2520_private *priv = data;
|
|
schedule_work(&priv->fifop_irqwork);
|
|
return IRQ_HANDLED;
|
}
|
|
static irqreturn_t cc2520_sfd_isr(int irq, void *data)
|
{
|
struct cc2520_private *priv = data;
|
unsigned long flags;
|
|
spin_lock_irqsave(&priv->lock, flags);
|
if (priv->is_tx) {
|
priv->is_tx = 0;
|
spin_unlock_irqrestore(&priv->lock, flags);
|
dev_dbg(&priv->spi->dev, "SFD for TX\n");
|
complete(&priv->tx_complete);
|
} else {
|
spin_unlock_irqrestore(&priv->lock, flags);
|
dev_dbg(&priv->spi->dev, "SFD for RX\n");
|
}
|
|
return IRQ_HANDLED;
|
}
|
|
static int cc2520_get_platform_data(struct spi_device *spi,
|
struct cc2520_platform_data *pdata)
|
{
|
struct device_node *np = spi->dev.of_node;
|
struct cc2520_private *priv = spi_get_drvdata(spi);
|
|
if (!np) {
|
struct cc2520_platform_data *spi_pdata = spi->dev.platform_data;
|
|
if (!spi_pdata)
|
return -ENOENT;
|
*pdata = *spi_pdata;
|
priv->fifo_pin = pdata->fifo;
|
return 0;
|
}
|
|
pdata->fifo = of_get_named_gpio(np, "fifo-gpio", 0);
|
priv->fifo_pin = pdata->fifo;
|
|
pdata->fifop = of_get_named_gpio(np, "fifop-gpio", 0);
|
|
pdata->sfd = of_get_named_gpio(np, "sfd-gpio", 0);
|
pdata->cca = of_get_named_gpio(np, "cca-gpio", 0);
|
pdata->vreg = of_get_named_gpio(np, "vreg-gpio", 0);
|
pdata->reset = of_get_named_gpio(np, "reset-gpio", 0);
|
|
/* CC2591 front end for CC2520 */
|
if (of_property_read_bool(np, "amplified"))
|
priv->amplified = true;
|
|
return 0;
|
}
|
|
static int cc2520_hw_init(struct cc2520_private *priv)
|
{
|
u8 status = 0, state = 0xff;
|
int ret;
|
int timeout = 100;
|
struct cc2520_platform_data pdata;
|
|
ret = cc2520_get_platform_data(priv->spi, &pdata);
|
if (ret)
|
goto err_ret;
|
|
ret = cc2520_read_register(priv, CC2520_FSMSTAT1, &state);
|
if (ret)
|
goto err_ret;
|
|
if (state != STATE_IDLE)
|
return -EINVAL;
|
|
do {
|
ret = cc2520_get_status(priv, &status);
|
if (ret)
|
goto err_ret;
|
|
if (timeout-- <= 0) {
|
dev_err(&priv->spi->dev, "oscillator start failed!\n");
|
return ret;
|
}
|
udelay(1);
|
} while (!(status & CC2520_STATUS_XOSC32M_STABLE));
|
|
dev_vdbg(&priv->spi->dev, "oscillator brought up\n");
|
|
/* If the CC2520 is connected to a CC2591 amplifier, we must both
|
* configure GPIOs on the CC2520 to correctly configure the CC2591
|
* and change a couple settings of the CC2520 to work with the
|
* amplifier. See section 8 page 17 of TI application note AN065.
|
* http://www.ti.com/lit/an/swra229a/swra229a.pdf
|
*/
|
if (priv->amplified) {
|
ret = cc2520_write_register(priv, CC2520_AGCCTRL1, 0x16);
|
if (ret)
|
goto err_ret;
|
|
ret = cc2520_write_register(priv, CC2520_GPIOCTRL0, 0x46);
|
if (ret)
|
goto err_ret;
|
|
ret = cc2520_write_register(priv, CC2520_GPIOCTRL5, 0x47);
|
if (ret)
|
goto err_ret;
|
|
ret = cc2520_write_register(priv, CC2520_GPIOPOLARITY, 0x1e);
|
if (ret)
|
goto err_ret;
|
|
ret = cc2520_write_register(priv, CC2520_TXCTRL, 0xc1);
|
if (ret)
|
goto err_ret;
|
} else {
|
ret = cc2520_write_register(priv, CC2520_AGCCTRL1, 0x11);
|
if (ret)
|
goto err_ret;
|
}
|
|
/* Registers default value: section 28.1 in Datasheet */
|
|
/* Set the CCA threshold to -50 dBm. This seems to have been copied
|
* from the TinyOS CC2520 driver and is much higher than the -84 dBm
|
* threshold suggested in the datasheet.
|
*/
|
ret = cc2520_write_register(priv, CC2520_CCACTRL0, 0x1A);
|
if (ret)
|
goto err_ret;
|
|
ret = cc2520_write_register(priv, CC2520_MDMCTRL0, 0x85);
|
if (ret)
|
goto err_ret;
|
|
ret = cc2520_write_register(priv, CC2520_MDMCTRL1, 0x14);
|
if (ret)
|
goto err_ret;
|
|
ret = cc2520_write_register(priv, CC2520_RXCTRL, 0x3f);
|
if (ret)
|
goto err_ret;
|
|
ret = cc2520_write_register(priv, CC2520_FSCTRL, 0x5a);
|
if (ret)
|
goto err_ret;
|
|
ret = cc2520_write_register(priv, CC2520_FSCAL1, 0x2b);
|
if (ret)
|
goto err_ret;
|
|
ret = cc2520_write_register(priv, CC2520_ADCTEST0, 0x10);
|
if (ret)
|
goto err_ret;
|
|
ret = cc2520_write_register(priv, CC2520_ADCTEST1, 0x0e);
|
if (ret)
|
goto err_ret;
|
|
ret = cc2520_write_register(priv, CC2520_ADCTEST2, 0x03);
|
if (ret)
|
goto err_ret;
|
|
/* Configure registers correctly for this driver. */
|
ret = cc2520_write_register(priv, CC2520_FRMCTRL1,
|
FRMCTRL1_SET_RXENMASK_ON_TX |
|
FRMCTRL1_IGNORE_TX_UNDERF);
|
if (ret)
|
goto err_ret;
|
|
ret = cc2520_write_register(priv, CC2520_FIFOPCTRL, 127);
|
if (ret)
|
goto err_ret;
|
|
return 0;
|
|
err_ret:
|
return ret;
|
}
|
|
static int cc2520_probe(struct spi_device *spi)
|
{
|
struct cc2520_private *priv;
|
struct cc2520_platform_data pdata;
|
int ret;
|
|
priv = devm_kzalloc(&spi->dev, sizeof(*priv), GFP_KERNEL);
|
if (!priv)
|
return -ENOMEM;
|
|
spi_set_drvdata(spi, priv);
|
|
ret = cc2520_get_platform_data(spi, &pdata);
|
if (ret < 0) {
|
dev_err(&spi->dev, "no platform data\n");
|
return -EINVAL;
|
}
|
|
priv->spi = spi;
|
|
priv->buf = devm_kzalloc(&spi->dev,
|
SPI_COMMAND_BUFFER, GFP_KERNEL);
|
if (!priv->buf)
|
return -ENOMEM;
|
|
mutex_init(&priv->buffer_mutex);
|
INIT_WORK(&priv->fifop_irqwork, cc2520_fifop_irqwork);
|
spin_lock_init(&priv->lock);
|
init_completion(&priv->tx_complete);
|
|
/* Assumption that CC2591 is not connected */
|
priv->amplified = false;
|
|
/* Request all the gpio's */
|
if (!gpio_is_valid(pdata.fifo)) {
|
dev_err(&spi->dev, "fifo gpio is not valid\n");
|
ret = -EINVAL;
|
goto err_hw_init;
|
}
|
|
ret = devm_gpio_request_one(&spi->dev, pdata.fifo,
|
GPIOF_IN, "fifo");
|
if (ret)
|
goto err_hw_init;
|
|
if (!gpio_is_valid(pdata.cca)) {
|
dev_err(&spi->dev, "cca gpio is not valid\n");
|
ret = -EINVAL;
|
goto err_hw_init;
|
}
|
|
ret = devm_gpio_request_one(&spi->dev, pdata.cca,
|
GPIOF_IN, "cca");
|
if (ret)
|
goto err_hw_init;
|
|
if (!gpio_is_valid(pdata.fifop)) {
|
dev_err(&spi->dev, "fifop gpio is not valid\n");
|
ret = -EINVAL;
|
goto err_hw_init;
|
}
|
|
ret = devm_gpio_request_one(&spi->dev, pdata.fifop,
|
GPIOF_IN, "fifop");
|
if (ret)
|
goto err_hw_init;
|
|
if (!gpio_is_valid(pdata.sfd)) {
|
dev_err(&spi->dev, "sfd gpio is not valid\n");
|
ret = -EINVAL;
|
goto err_hw_init;
|
}
|
|
ret = devm_gpio_request_one(&spi->dev, pdata.sfd,
|
GPIOF_IN, "sfd");
|
if (ret)
|
goto err_hw_init;
|
|
if (!gpio_is_valid(pdata.reset)) {
|
dev_err(&spi->dev, "reset gpio is not valid\n");
|
ret = -EINVAL;
|
goto err_hw_init;
|
}
|
|
ret = devm_gpio_request_one(&spi->dev, pdata.reset,
|
GPIOF_OUT_INIT_LOW, "reset");
|
if (ret)
|
goto err_hw_init;
|
|
if (!gpio_is_valid(pdata.vreg)) {
|
dev_err(&spi->dev, "vreg gpio is not valid\n");
|
ret = -EINVAL;
|
goto err_hw_init;
|
}
|
|
ret = devm_gpio_request_one(&spi->dev, pdata.vreg,
|
GPIOF_OUT_INIT_LOW, "vreg");
|
if (ret)
|
goto err_hw_init;
|
|
gpio_set_value(pdata.vreg, HIGH);
|
usleep_range(100, 150);
|
|
gpio_set_value(pdata.reset, HIGH);
|
usleep_range(200, 250);
|
|
ret = cc2520_hw_init(priv);
|
if (ret)
|
goto err_hw_init;
|
|
/* Set up fifop interrupt */
|
ret = devm_request_irq(&spi->dev,
|
gpio_to_irq(pdata.fifop),
|
cc2520_fifop_isr,
|
IRQF_TRIGGER_RISING,
|
dev_name(&spi->dev),
|
priv);
|
if (ret) {
|
dev_err(&spi->dev, "could not get fifop irq\n");
|
goto err_hw_init;
|
}
|
|
/* Set up sfd interrupt */
|
ret = devm_request_irq(&spi->dev,
|
gpio_to_irq(pdata.sfd),
|
cc2520_sfd_isr,
|
IRQF_TRIGGER_FALLING,
|
dev_name(&spi->dev),
|
priv);
|
if (ret) {
|
dev_err(&spi->dev, "could not get sfd irq\n");
|
goto err_hw_init;
|
}
|
|
ret = cc2520_register(priv);
|
if (ret)
|
goto err_hw_init;
|
|
return 0;
|
|
err_hw_init:
|
mutex_destroy(&priv->buffer_mutex);
|
flush_work(&priv->fifop_irqwork);
|
return ret;
|
}
|
|
static int cc2520_remove(struct spi_device *spi)
|
{
|
struct cc2520_private *priv = spi_get_drvdata(spi);
|
|
mutex_destroy(&priv->buffer_mutex);
|
flush_work(&priv->fifop_irqwork);
|
|
ieee802154_unregister_hw(priv->hw);
|
ieee802154_free_hw(priv->hw);
|
|
return 0;
|
}
|
|
static const struct spi_device_id cc2520_ids[] = {
|
{"cc2520", },
|
{},
|
};
|
MODULE_DEVICE_TABLE(spi, cc2520_ids);
|
|
static const struct of_device_id cc2520_of_ids[] = {
|
{.compatible = "ti,cc2520", },
|
{},
|
};
|
MODULE_DEVICE_TABLE(of, cc2520_of_ids);
|
|
/* SPI driver structure */
|
static struct spi_driver cc2520_driver = {
|
.driver = {
|
.name = "cc2520",
|
.of_match_table = of_match_ptr(cc2520_of_ids),
|
},
|
.id_table = cc2520_ids,
|
.probe = cc2520_probe,
|
.remove = cc2520_remove,
|
};
|
module_spi_driver(cc2520_driver);
|
|
MODULE_AUTHOR("Varka Bhadram <varkab@cdac.in>");
|
MODULE_DESCRIPTION("CC2520 Transceiver Driver");
|
MODULE_LICENSE("GPL v2");
|
