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linux_dsm_epyc7002/drivers/net/ieee802154/cc2520.c
Brad Campbell f0b7d43c8a cc2520: Add support for CC2591 amplifier. 
The TI CC2521 is an RF power amplifier that is designed to interface
with the CC2520. Conveniently, it directly interfaces with the CC2520
and does not require any pins to be connected to a
microcontroller/processor. Adding a CC2591 increases the CC2520's range,
which is useful for border router and other wall-powered applications.

Using the CC2591 with the CC2520 requires configuring the CC2520 GPIOs
that are connected to the CC2591 to correctly set the CC2591 into TX and
RX modes. Further, TI recommends that the CC2520_TXPOWER and
CC2520_AGCCTRL1 registers are set differently to maximize the CC2591's
performance. These settings are covered in TI Application Note AN065.

This patch adds an optional `amplified` field to the cc2520 entry in the
device tree. If present, the CC2520 will be configured to operate with a
CC2591.

The expected pin mapping is:
CC2520 GPIO0 --> CC2591 EN
CC2520 GPIO5 --> CC2591 PAEN

Signed-off-by: Brad Campbell <bradjc5@gmail.com>
Acked-by: Varka Bhadram <varkabhadram@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
2015-03-18 17:50:25 +01:00

1062 lines
25 KiB
C
Raw Blame History

/* 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 <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
/* 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 */
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 */
};
/* 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 *data, u8 len)
{
int status;
/* length byte must include FCS even
* if it is calculated in the hardware
*/
int len_byte = len + 2;
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, u8 *lqi)
{
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;
rc = cc2520_cmd_strobe(priv, CC2520_CMD_SFLUSHTX);
if (rc)
goto err_tx;
rc = cc2520_write_txfifo(priv, 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);
BUG_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;
cc2520_read_rxfifo(priv, &len, bytes, &lqi);
if (len < 2 || len > IEEE802154_MTU)
return -EINVAL;
skb = dev_alloc_skb(len);
if (!skb)
return -ENOMEM;
if (cc2520_read_rxfifo(priv, skb_put(skb, len), len, &lqi)) {
dev_dbg(&priv->spi->dev, "frame reception failed\n");
kfree_skb(skb);
return -EINVAL;
}
skb_trim(skb, skb->len - 2);
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");
BUG_ON(page != 0);
BUG_ON(channel < CC2520_MINCHANNEL);
BUG_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;
if (changed & IEEE802154_AFILT_PANID_CHANGED) {
u16 panid = le16_to_cpu(filt->pan_id);
dev_vdbg(&priv->spi->dev,
"cc2520_filter called for pan id\n");
cc2520_write_ram(priv, CC2520RAM_PANID,
sizeof(panid), (u8 *)&panid);
}
if (changed & IEEE802154_AFILT_IEEEADDR_CHANGED) {
dev_vdbg(&priv->spi->dev,
"cc2520_filter called for IEEE addr\n");
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,
"cc2520_filter called for saddr\n");
cc2520_write_ram(priv, CC2520RAM_SHORTADDR,
sizeof(addr), (u8 *)&addr);
}
if (changed & IEEE802154_AFILT_PANC_CHANGED) {
dev_vdbg(&priv->spi->dev,
"cc2520_filter called for panc change\n");
if (filt->pan_coord)
cc2520_write_register(priv, CC2520_FRMFILT0, 0x02);
else
cc2520_write_register(priv, CC2520_FRMFILT0, 0x00);
}
return 0;
}
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,
};
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;
priv->hw->vif_data_size = sizeof(*priv);
ieee802154_random_extended_addr(&priv->hw->phy->perm_extended_addr);
/* We do support only 2.4 Ghz */
priv->hw->phy->channels_supported[0] = 0x7FFF800;
priv->hw->flags = IEEE802154_HW_OMIT_CKSUM | IEEE802154_HW_AACK |
IEEE802154_HW_AFILT;
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;
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);
pdata->amplified = of_property_read_bool(np, "amplified");
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 (pdata.amplified) {
ret = cc2520_write_register(priv, CC2520_TXPOWER, 0xF9);
if (ret)
goto err_ret;
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_TXPOWER, 0xF7);
if (ret)
goto err_ret;
ret = cc2520_write_register(priv, CC2520_AGCCTRL1, 0x11);
if (ret)
goto err_ret;
}
/* Registers default value: section 28.1 in 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;
ret = cc2520_write_register(priv, CC2520_FRMCTRL0, 0x60);
if (ret)
goto err_ret;
ret = cc2520_write_register(priv, CC2520_FRMCTRL1, 0x03);
if (ret)
goto err_ret;
ret = cc2520_write_register(priv, CC2520_FRMFILT0, 0x00);
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);
/* 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",
.bus = &spi_bus_type,
.owner = THIS_MODULE,
.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");
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