--- /dev/null
+/* 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/pinctrl/consumer.h>
+#include <linux/of_gpio.h>
+
+#include <net/mac802154.h>
+#include <net/wpan-phy.h>
+#include <net/ieee802154.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 (1 << 7)
+#define CC2520_STATUS_RSSI_VALID (1 << 6)
+#define CC2520_STATUS_TX_UNDERFLOW (1 << 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_dev *dev; /* 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_dev *dev)
+{
+ return cc2520_cmd_strobe(dev->priv, CC2520_CMD_SRXON);
+}
+
+static void cc2520_stop(struct ieee802154_dev *dev)
+{
+ cc2520_cmd_strobe(dev->priv, CC2520_CMD_SRFOFF);
+}
+
+static int
+cc2520_tx(struct ieee802154_dev *dev, struct sk_buff *skb)
+{
+ struct cc2520_private *priv = dev->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 = alloc_skb(len, GFP_KERNEL);
+ 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->dev, skb, lqi);
+
+ dev_vdbg(&priv->spi->dev, "RXFIFO: %x %x\n", len, lqi);
+
+ return 0;
+}
+
+static int
+cc2520_ed(struct ieee802154_dev *dev, u8 *level)
+{
+ struct cc2520_private *priv = dev->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_dev *dev, int page, int channel)
+{
+ struct cc2520_private *priv = dev->priv;
+ int ret;
+
+ might_sleep();
+ 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_dev *dev,
+ struct ieee802154_hw_addr_filt *filt, unsigned long changed)
+{
+ struct cc2520_private *priv = dev->priv;
+
+ if (changed & IEEE802515_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 & IEEE802515_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 & IEEE802515_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 & IEEE802515_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 struct ieee802154_ops cc2520_ops = {
+ .owner = THIS_MODULE,
+ .start = cc2520_start,
+ .stop = cc2520_stop,
+ .xmit = 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->dev = ieee802154_alloc_device(sizeof(*priv), &cc2520_ops);
+ if (!priv->dev)
+ goto err_ret;
+
+ priv->dev->priv = priv;
+ priv->dev->parent = &priv->spi->dev;
+ priv->dev->extra_tx_headroom = 0;
+
+ /* We do support only 2.4 Ghz */
+ priv->dev->phy->channels_supported[0] = 0x7FFF800;
+ priv->dev->flags = IEEE802154_HW_OMIT_CKSUM | IEEE802154_HW_AACK;
+
+ dev_vdbg(&priv->spi->dev, "registered cc2520\n");
+ ret = ieee802154_register_device(priv->dev);
+ if (ret)
+ goto err_free_device;
+
+ return 0;
+
+err_free_device:
+ ieee802154_free_device(priv->dev);
+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_hw_init(struct cc2520_private *priv)
+{
+ u8 status = 0, state = 0xff;
+ int ret;
+ int timeout = 100;
+
+ 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");
+
+ /* Registers default value: section 28.1 in Datasheet */
+ ret = cc2520_write_register(priv, CC2520_TXPOWER, 0xF7);
+ if (ret)
+ goto err_ret;
+
+ 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_AGCCTRL1, 0x11);
+ 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 struct cc2520_platform_data *
+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)
+ return spi->dev.platform_data;
+
+ pdata = devm_kzalloc(&spi->dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata)
+ goto done;
+
+ 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);
+
+ spi->dev.platform_data = pdata;
+
+done:
+ return pdata;
+}
+
+static int cc2520_probe(struct spi_device *spi)
+{
+ struct cc2520_private *priv;
+ struct pinctrl *pinctrl;
+ struct cc2520_platform_data *pdata;
+ int ret;
+
+ priv = devm_kzalloc(&spi->dev,
+ sizeof(struct cc2520_private), GFP_KERNEL);
+ if (!priv) {
+ ret = -ENOMEM;
+ goto err_ret;
+ }
+
+ spi_set_drvdata(spi, priv);
+
+ pinctrl = devm_pinctrl_get_select_default(&spi->dev);
+ if (IS_ERR(pinctrl))
+ dev_warn(&spi->dev,
+ "pinctrl pins are not configured");
+
+ pdata = cc2520_get_platform_data(spi);
+ if (!pdata) {
+ 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) {
+ ret = -ENOMEM;
+ goto err_ret;
+ }
+
+ 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);
+
+err_ret:
+ 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_device(priv->dev);
+ ieee802154_free_device(priv->dev);
+
+ 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");
projects / cascardo / linux.git / commitdiff