| Message ID | 1402894318-30349-2-git-send-email-varkab@cdac.in |
|---|---|
| State | Changes Requested, archived |
| Delegated to: | David Miller |
| Headers | show |
Hi Varka, On Mon, Jun 16, 2014 at 10:21:56AM +0530, Varka Bhadram wrote: > Maybe some more information about this chip in the commit msg? > Signed-off-by: Varka Bhadram <varkab@cdac.in> > --- > drivers/net/ieee802154/cc2520.c | 805 +++++++++++++++++++++++++++++++++++++++ > include/linux/spi/cc2520.h | 176 +++++++++ > 2 files changed, 981 insertions(+) > create mode 100644 drivers/net/ieee802154/cc2520.c > create mode 100644 include/linux/spi/cc2520.h > > diff --git a/drivers/net/ieee802154/cc2520.c b/drivers/net/ieee802154/cc2520.c > new file mode 100644 > index 0000000..e8b5993 > --- /dev/null > +++ b/drivers/net/ieee802154/cc2520.c > @@ -0,0 +1,805 @@ > +/* 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_device.h> > +#include <linux/of_platform.h> > +#include <linux/of_gpio.h> > + > +#include <net/mac802154.h> > +#include <net/wpan-phy.h> > + > +#define SPI_COMMAND_BUFFER 3 > +#define HIGH 1 > +#define LOW 0 > +#define STATE_IDLE 0 > + > +/*Driver private information */ > +struct cc2520_private { > + struct spi_device *spi; > + > + struct ieee802154_dev *dev; > + > + u8 *buf; > + struct mutex buffer_mutex; > + > + unsigned is_tx:1; > + int fifo_irq; > + > + int fifo_pin; > + int fifop_pin; > + > + struct work_struct fifop_irqwork; > + > + spinlock_t lock; > + > + struct completion tx_complete; > +}; > + > +/*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); I see, you maybe looked at others drivers like at86rf230 and see what they do there. I really don't like the lowlevel spi calls in the others drivers. There are spi helper functions like 'spi_write_then_read' look in drivers/spi/spi.c for the helper functions. Then you don't need the buffer_mutex also. > + > + 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 void cc2520_unregister(struct cc2520_private *priv) > +{ > + ieee802154_unregister_device(priv->dev); > + ieee802154_free_device(priv->dev); > +} Only used in remove callback of module. It's small enough to do this in the remove callback. > + > +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_err(&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; > + > + spin_lock(&priv->lock); You need to use here spin_lock_irqsave and spin_unlock_irqrestore here. Please verify you locking with PROVE_LOCKING enabled in your kernel. In your xmit callback you use a irqsave spinlocks there. You need always save to the "strongest" context which is a interrupt in your case. > + if (priv->is_tx) { > + dev_dbg(&priv->spi->dev, "SFD for TX\n"); > + priv->is_tx = 0; > + complete(&priv->tx_complete); > + } else > + dev_dbg(&priv->spi->dev, "SFD for RX\n"); make brackets in the else branch if you have brackets in the "if" branch. You don't need to lock all the things here I think: --snip 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"); } --snap > + spin_unlock(&priv->lock); > + > + 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) { > + ret = -EINVAL; > + return ret; return -EINVAL? saves the brackets ;) > + } > + > + 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 successfully 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 __maybe_unused *np = spi->dev.of_node; > + struct cc2520_private *priv = spi_get_drvdata(spi); > + > + if (!IS_ENABLED(CONFIG_OF) || !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); > + priv->fifop_pin = pdata->fifop; > + > + 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; > +} > + > +/*Driver probe function*/ > +static int cc2520_probe(struct spi_device *spi) > +{ > + struct cc2520_private *priv; > + struct pinctrl *pinctrl; > + struct cc2520_platform_data *pdata; > + struct device_node __maybe_unused *np = spi->dev.of_node; > + int ret; > + > + priv = kzalloc(sizeof(struct cc2520_private), GFP_KERNEL); > + if (!priv) { > + ret = -ENOMEM; > + goto err_free_local; > + } why not devm_ calls? > + > + 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 from the driver"); > + > + pdata = cc2520_get_platform_data(spi); > + if (!pdata) { > + dev_err(&spi->dev, "no platform data\n"); > + return -EINVAL; memory leak of priv here. > + } > + > + mutex_init(&priv->buffer_mutex); > + INIT_WORK(&priv->fifop_irqwork, cc2520_fifop_irqwork); I really don't like also the workqueue here. The at86rf230 use also a workqueue but the mrf24j40 uses 'devm_request_threaded_irq'. A threaded irq can also handle sync spi calls. > + spin_lock_init(&priv->lock); > + init_completion(&priv->tx_complete); > + > + priv->spi = spi; > + > + priv->buf = kzalloc(SPI_COMMAND_BUFFER, GFP_KERNEL); > + if (!priv->buf) { > + ret = -ENOMEM; > + goto err_free_buf; > + } > + > + /*Request all the gpio's*/ > + if (gpio_is_valid(pdata->fifo)) { > + ret = devm_gpio_request_one(&spi->dev, pdata->fifo, > + GPIOF_IN, "fifo"); > + if (ret) > + goto err_hw_init; > + } > + > + if (gpio_is_valid(pdata->cca)) { > + ret = devm_gpio_request_one(&spi->dev, pdata->cca, > + GPIOF_IN, "cca"); > + if (ret) > + goto err_hw_init; > + } > + > + if (gpio_is_valid(pdata->fifop)) { > + ret = devm_gpio_request_one(&spi->dev, pdata->fifop, > + GPIOF_IN, "fifop"); > + if (ret) > + goto err_hw_init; > + } > + > + if (gpio_is_valid(pdata->sfd)) { > + ret = devm_gpio_request_one(&spi->dev, pdata->sfd, > + GPIOF_IN, "sfd"); > + if (ret) > + goto err_hw_init; > + } > + > + if (gpio_is_valid(pdata->reset)) { > + 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)) { > + ret = devm_gpio_request_one(&spi->dev, pdata->vreg, > + GPIOF_OUT_INIT_LOW, "vreg"); > + if (ret) > + goto err_hw_init; > + } You should check on the not optional pins if you can request them. You use in the above code the pins vreg, reset, fifo_irq, sfd. And this failed if the gpio's are not valid. means: if (!gpio_is_valid(pdata->vreg)) { dev_err(....) ret = -EINVAL; goto ...; } on all pins which are needed to use your chip. > + > + gpio_set_value(pdata->vreg, HIGH); > + udelay(100); > + > + gpio_set_value(pdata->reset, HIGH); > + udelay(200); > + > + ret = cc2520_hw_init(priv); > + if (ret) > + goto err_hw_init; > + > + /*Set up fifop interrupt */ > + priv->fifo_irq = gpio_to_irq(pdata->fifop); why is fifo_irq in your "private data"? This is only used in this function. > + ret = devm_request_irq(&spi->dev, > + priv->fifo_irq, > + 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_free_buf: > + kfree(priv->buf); > + > +err_free_local: > + kfree(priv); > + > + return ret; > +} > + > +/*Driver remove function*/ > +static int cc2520_remove(struct spi_device *spi) > +{ > + struct cc2520_private *priv = spi_get_drvdata(spi); > + > + cc2520_unregister(priv); > + > + mutex_destroy(&priv->buffer_mutex); > + flush_work(&priv->fifop_irqwork); > + > + kfree(priv->buf); > + kfree(priv); > + > + return 0; > +} > + > +static const struct spi_device_id cc2520_ids[] = { > + {"cc2520", 0}, You don't need to set the driver_data to 0. Simple: { "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_DESCRIPTION("CC2520 Transceiver Driver"); > +MODULE_LICENSE("GPL v2"); > diff --git a/include/linux/spi/cc2520.h b/include/linux/spi/cc2520.h > new file mode 100644 > index 0000000..68a2c88 > --- /dev/null > +++ b/include/linux/spi/cc2520.h In this location of header files are platform_data structs only. I think you should leave the cc2520_platform_data in this file and move the rest of declaration to you cc2520.c file. > @@ -0,0 +1,176 @@ > +#ifndef __CC2520_H > +#define __CC2520_H > + > +#define RSSI_VALID 0 > +#define RSSI_OFFSET 78 > +#define CC2520_FREG_MASK 0x3F > + > +struct cc2520_platform_data { > + int fifo; > + int fifop; > + int cca; > + int sfd; > + int reset; > + int vreg; > +}; > + - Alex -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Hi Alex, Thanks for the comments. I will create a patch for the required changes with Reported-by Alexander Aring <...> reply if this is okay for you. On 06/16/2014 01:08 PM, Alexander Aring wrote: > Hi Varka, > > On Mon, Jun 16, 2014 at 10:21:56AM +0530, Varka Bhadram wrote: > Maybe some more information about this chip in the commit msg? I will provide the proper commit messages in next version > > +/*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); > I see, you maybe looked at others drivers like at86rf230 and see what > they do there. I really don't like the lowlevel spi calls in the others > drivers. There are spi helper functions like 'spi_write_then_read' look > in drivers/spi/spi.c for the helper functions. Then you don't need the > buffer_mutex also. In at86rf230 driver first it hold the mutex lock for buffer then __at86rf230_read_subreg()/ __at86rf230_write() functions called. One more thing is that at the low level spi core is holding the lock for the buffer data. We can remove the buffer mutex. >> + >> + 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 void cc2520_unregister(struct cc2520_private *priv) >> +{ >> + ieee802154_unregister_device(priv->dev); >> + ieee802154_free_device(priv->dev); >> +} > Only used in remove callback of module. It's small enough to do this in > the remove callback. > Ya its nice . We can save the cpu context switching time also.... >> + >> +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_err(&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; >> + >> + spin_lock(&priv->lock); > You need to use here spin_lock_irqsave and spin_unlock_irqrestore here. > Please verify you locking with PROVE_LOCKING enabled in your kernel. > > In your xmit callback you use a irqsave spinlocks there. You need always > save to the "strongest" context which is a interrupt in your case. This type of mechanism is needed when you want to remember the interrupt status for the IRQ/system. >> + if (priv->is_tx) { >> + dev_dbg(&priv->spi->dev, "SFD for TX\n"); >> + priv->is_tx = 0; >> + complete(&priv->tx_complete); >> + } else >> + dev_dbg(&priv->spi->dev, "SFD for RX\n"); > make brackets in the else branch if you have brackets in the "if" branch. > > You don't need to lock all the things here I think: > > --snip > 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"); > } > --snap > Ya this can be the good approach... >> + spin_unlock(&priv->lock); >> + >> + return IRQ_HANDLED >> +/*Driver probe function*/ >> +static int cc2520_probe(struct spi_device *spi) >> +{ >> + struct cc2520_private *priv; >> + struct pinctrl *pinctrl; >> + struct cc2520_platform_data *pdata; >> + struct device_node __maybe_unused *np = spi->dev.of_node; >> + int ret; >> + >> + priv = kzalloc(sizeof(struct cc2520_private), GFP_KERNEL); >> + if (!priv) { >> + ret = -ENOMEM; >> + goto err_free_local; >> + } > why not devm_ calls? I will surely change it to devm_.... >> + >> + spi_set_drvdata(spi, priv); >> + >> + pinctrl = devm_pinctrl_get_select_default(&spi->dev); >> + >> + if (gpio_is_valid(pdata->vreg)) { >> + ret = devm_gpio_request_one(&spi->dev, pdata->vreg, >> + GPIOF_OUT_INIT_LOW, "vreg"); >> + if (ret) >> + goto err_hw_init; >> + } > You should check on the not optional pins if you can request them. You > use in the above code the pins vreg, reset, fifo_irq, sfd. And this > failed if the gpio's are not valid. > > means: > > if (!gpio_is_valid(pdata->vreg)) { > dev_err(....) > ret = -EINVAL; > goto ...; > } > > on all pins which are needed to use your chip. > >> + >> + gpio_set_value(pdata->vreg, HIGH); >> + udelay(100); >> + >> + gpio_set_value(pdata->reset, HIGH); >> + udelay(200); >> + >> + ret = cc2520_hw_init(priv); >> + if (ret) >> + goto err_hw_init; >> + >> + /*Set up fifop interrupt */ >> + priv->fifo_irq = gpio_to_irq(pdata->fifop); > why is fifo_irq in your "private data"? This is only used in this function. Ya this is my mistake. Previously i used in other place also. >> + ret = devm_request_irq(&spi->dev, >> + priv->fifo_irq, >> + 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_free_buf: >> + kfree(priv->buf); >> + >> +err_free_local: >> + kfree(priv); >> + >> + return ret; >> +} >> + >> +/*Driver remove function*/ >> +static int cc2520_remove(struct spi_device *spi) >> +{ >> + struct cc2520_private *priv = spi_get_drvdata(spi); >> + >> + cc2520_unregister(priv); >> + >> + mutex_destroy(&priv->buffer_mutex); >> + flush_work(&priv->fifop_irqwork); >> + >> + kfree(priv->buf); >> + kfree(priv); >> + >> + return 0; >> +} >> + >> +static const struct spi_device_id cc2520_ids[] = { >> + {"cc2520", 0}, > You don't need to set the driver_data to 0. Simple: > { "cc2520", }, this does not make any difference. >> + {}, >> +}; >> +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_DESCRIPTION("CC2520 Transceiver Driver"); >> +MODULE_LICENSE("GPL v2"); >> diff --git a/include/linux/spi/cc2520.h b/include/linux/spi/cc2520.h >> new file mode 100644 >> index 0000000..68a2c88 >> --- /dev/null >> +++ b/include/linux/spi/cc2520.h > In this location of header files are platform_data structs only. I think > you should leave the cc2520_platform_data in this file and move the rest > of declaration to you cc2520.c file. > I will move the code >> @@ -0,0 +1,176 @@ >> +#ifndef __CC2520_H >> +#define __CC2520_H >> + >> +#define RSSI_VALID 0 >> +#define RSSI_OFFSET 78 >> +#define CC2520_FREG_MASK 0x3F >> + >> +struct cc2520_platform_data { >> + int fifo; >> + int fifop; >> + int cca; >> + int sfd; >> + int reset; >> + int vreg; >> +}; >> + > - Alex -Varka Bhadram ------------------------------------------------------------------------------------------------------------------------------- [ C-DAC is on Social-Media too. Kindly follow us at: Facebook: https://www.facebook.com/CDACINDIA & Twitter: @cdacindia ] This e-mail is for the sole use of the intended recipient(s) and may contain confidential and privileged information. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies and the original message. 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Hi, On Mon, Jun 16, 2014 at 02:21:19PM +0530, Varka Bhadram wrote: ... > >>+ > >>+static void cc2520_unregister(struct cc2520_private *priv) > >>+{ > >>+ ieee802154_unregister_device(priv->dev); > >>+ ieee802154_free_device(priv->dev); > >>+} > >Only used in remove callback of module. It's small enough to do this in > >the remove callback. > > There is no context switch here. It's a little bit faster because you don't put some things on the stack. Alternative would be to add a inline keyword to this function. > Ya its nice . We can save the cpu context switching time also.... > >>+ > >>+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_err(&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; > >>+ > >>+ spin_lock(&priv->lock); > >You need to use here spin_lock_irqsave and spin_unlock_irqrestore here. > >Please verify you locking with PROVE_LOCKING enabled in your kernel. > > > >In your xmit callback you use a irqsave spinlocks there. You need always > >save to the "strongest" context which is a interrupt in your case. > This type of mechanism is needed when you want to remember the interrupt > status for the > IRQ/system. Yes you need I spinlock here, but spin_lock isn't irqsave but you need a spin_lock function which is irqsave. This is spin_lock_irqsave/spin_unlock_irqrestore. You use these function in xmit callback for locking and that makes no sense. You need to use spin_lock_irqsave/spin_unlock_irqrestore there of course. But using in one function spin_lock_irqsave/spin_unlock_irqrestore and in the other function spin_lock/spin_unlock for the same spinlock is wrong. In your case the strongest context is an irq, so you need for your locking irqsave functions. Please compile your kernel with PROVE_LOCKING and test your driver, then you will see some warnings about deadlocks. > >>+ if (priv->is_tx) { > >>+ dev_dbg(&priv->spi->dev, "SFD for TX\n"); > >>+ priv->is_tx = 0; > >>+ complete(&priv->tx_complete); > >>+ } else > >>+ dev_dbg(&priv->spi->dev, "SFD for RX\n"); > >make brackets in the else branch if you have brackets in the "if" branch. > > > >You don't need to lock all the things here I think: > > > >--snip > > 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"); > > } > >--snap > > > Ya this can be the good approach... > >>+ spin_unlock(&priv->lock); > >>+ > >>+ return IRQ_HANDLED > >>+/*Driver probe function*/ > >>+static int cc2520_probe(struct spi_device *spi) > >>+{ > >>+ struct cc2520_private *priv; > >>+ struct pinctrl *pinctrl; > >>+ struct cc2520_platform_data *pdata; > >>+ struct device_node __maybe_unused *np = spi->dev.of_node; > >>+ int ret; > >>+ > >>+ priv = kzalloc(sizeof(struct cc2520_private), GFP_KERNEL); > >>+ if (!priv) { > >>+ ret = -ENOMEM; > >>+ goto err_free_local; > >>+ } > >why not devm_ calls? > I will surely change it to devm_.... > >>+ > >>+ spi_set_drvdata(spi, priv); > >>+ > >>+ pinctrl = devm_pinctrl_get_select_default(&spi->dev); > >>+ > >>+ if (gpio_is_valid(pdata->vreg)) { > >>+ ret = devm_gpio_request_one(&spi->dev, pdata->vreg, > >>+ GPIOF_OUT_INIT_LOW, "vreg"); > >>+ if (ret) > >>+ goto err_hw_init; > >>+ } > >You should check on the not optional pins if you can request them. You > >use in the above code the pins vreg, reset, fifo_irq, sfd. And this s/above/below > >failed if the gpio's are not valid. > > > >means: > > > >if (!gpio_is_valid(pdata->vreg)) { > > dev_err(....) > > ret = -EINVAL; > > goto ...; > >} > > > >on all pins which are needed to use your chip. > > > >>+ > >>+ gpio_set_value(pdata->vreg, HIGH); > >>+ udelay(100); > >>+ > >>+ gpio_set_value(pdata->reset, HIGH); > >>+ udelay(200); > >>+ > >>+ ret = cc2520_hw_init(priv); > >>+ if (ret) > >>+ goto err_hw_init; > >>+ > >>+ /*Set up fifop interrupt */ > >>+ priv->fifo_irq = gpio_to_irq(pdata->fifop); ... > >>+static const struct spi_device_id cc2520_ids[] = { > >>+ {"cc2520", 0}, > >You don't need to set the driver_data to 0. Simple: > > { "cc2520", }, > this does not make any difference. Yes, but saves code. :-) Usual prefer coding is: "(no difference + more code) < (no difference + less code)" - Alex -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/net/ieee802154/cc2520.c b/drivers/net/ieee802154/cc2520.c new file mode 100644 index 0000000..e8b5993 --- /dev/null +++ b/drivers/net/ieee802154/cc2520.c @@ -0,0 +1,805 @@ +/* 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_device.h> +#include <linux/of_platform.h> +#include <linux/of_gpio.h> + +#include <net/mac802154.h> +#include <net/wpan-phy.h> + +#define SPI_COMMAND_BUFFER 3 +#define HIGH 1 +#define LOW 0 +#define STATE_IDLE 0 + +/*Driver private information */ +struct cc2520_private { + struct spi_device *spi; + + struct ieee802154_dev *dev; + + u8 *buf; + struct mutex buffer_mutex; + + unsigned is_tx:1; + int fifo_irq; + + int fifo_pin; + int fifop_pin; + + struct work_struct fifop_irqwork; + + spinlock_t lock; + + struct completion tx_complete; +}; + +/*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_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]); + + *lqi = data[priv->buf[1] - 1] & 0x7f; + + 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); + + skb = alloc_skb(len, GFP_KERNEL); + if (!skb) + return -ENOMEM; + + cc2520_read_rxfifo(priv, skb_put(skb, len), &len, &lqi); + if (len < 2) { + 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) { + ret = -EINVAL; + return ret; + } + + 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 ret; +} + +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 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, +}; + +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; + + 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_unregister(struct cc2520_private *priv) +{ + ieee802154_unregister_device(priv->dev); + ieee802154_free_device(priv->dev); +} + +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_err(&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; + + spin_lock(&priv->lock); + if (priv->is_tx) { + dev_dbg(&priv->spi->dev, "SFD for TX\n"); + priv->is_tx = 0; + complete(&priv->tx_complete); + } else + dev_dbg(&priv->spi->dev, "SFD for RX\n"); + spin_unlock(&priv->lock); + + 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) { + ret = -EINVAL; + return ret; + } + + 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 successfully 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 __maybe_unused *np = spi->dev.of_node; + struct cc2520_private *priv = spi_get_drvdata(spi); + + if (!IS_ENABLED(CONFIG_OF) || !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); + priv->fifop_pin = pdata->fifop; + + 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; +} + +/*Driver probe function*/ +static int cc2520_probe(struct spi_device *spi) +{ + struct cc2520_private *priv; + struct pinctrl *pinctrl; + struct cc2520_platform_data *pdata; + struct device_node __maybe_unused *np = spi->dev.of_node; + int ret; + + priv = kzalloc(sizeof(struct cc2520_private), GFP_KERNEL); + if (!priv) { + ret = -ENOMEM; + goto err_free_local; + } + + 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 from the driver"); + + pdata = cc2520_get_platform_data(spi); + if (!pdata) { + dev_err(&spi->dev, "no platform data\n"); + return -EINVAL; + } + + mutex_init(&priv->buffer_mutex); + INIT_WORK(&priv->fifop_irqwork, cc2520_fifop_irqwork); + spin_lock_init(&priv->lock); + init_completion(&priv->tx_complete); + + priv->spi = spi; + + priv->buf = kzalloc(SPI_COMMAND_BUFFER, GFP_KERNEL); + if (!priv->buf) { + ret = -ENOMEM; + goto err_free_buf; + } + + /*Request all the gpio's*/ + if (gpio_is_valid(pdata->fifo)) { + ret = devm_gpio_request_one(&spi->dev, pdata->fifo, + GPIOF_IN, "fifo"); + if (ret) + goto err_hw_init; + } + + if (gpio_is_valid(pdata->cca)) { + ret = devm_gpio_request_one(&spi->dev, pdata->cca, + GPIOF_IN, "cca"); + if (ret) + goto err_hw_init; + } + + if (gpio_is_valid(pdata->fifop)) { + ret = devm_gpio_request_one(&spi->dev, pdata->fifop, + GPIOF_IN, "fifop"); + if (ret) + goto err_hw_init; + } + + if (gpio_is_valid(pdata->sfd)) { + ret = devm_gpio_request_one(&spi->dev, pdata->sfd, + GPIOF_IN, "sfd"); + if (ret) + goto err_hw_init; + } + + if (gpio_is_valid(pdata->reset)) { + 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)) { + 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); + udelay(100); + + gpio_set_value(pdata->reset, HIGH); + udelay(200); + + ret = cc2520_hw_init(priv); + if (ret) + goto err_hw_init; + + /*Set up fifop interrupt */ + priv->fifo_irq = gpio_to_irq(pdata->fifop); + ret = devm_request_irq(&spi->dev, + priv->fifo_irq, + 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_free_buf: + kfree(priv->buf); + +err_free_local: + kfree(priv); + + return ret; +} + +/*Driver remove function*/ +static int cc2520_remove(struct spi_device *spi) +{ + struct cc2520_private *priv = spi_get_drvdata(spi); + + cc2520_unregister(priv); + + mutex_destroy(&priv->buffer_mutex); + flush_work(&priv->fifop_irqwork); + + kfree(priv->buf); + kfree(priv); + + return 0; +} + +static const struct spi_device_id cc2520_ids[] = { + {"cc2520", 0}, + {}, +}; +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_DESCRIPTION("CC2520 Transceiver Driver"); +MODULE_LICENSE("GPL v2"); diff --git a/include/linux/spi/cc2520.h b/include/linux/spi/cc2520.h new file mode 100644 index 0000000..68a2c88 --- /dev/null +++ b/include/linux/spi/cc2520.h @@ -0,0 +1,176 @@ +#ifndef __CC2520_H +#define __CC2520_H + +#define RSSI_VALID 0 +#define RSSI_OFFSET 78 +#define CC2520_FREG_MASK 0x3F + +struct cc2520_platform_data { + int fifo; + int fifop; + int cca; + int sfd; + int reset; + int vreg; +}; + +enum cc2520_memory_size { + CC2520_RAM_SIZE = 640, + CC2520_FIFO_SIZE = 128, +}; + +enum cc2520_address { + CC2520RAM_TXFIFO = 0x100, + CC2520RAM_RXFIFO = 0x180, + CC2520RAM_IEEEADDR = 0x3EA, + CC2520RAM_PANID = 0x3F2, + CC2520RAM_SHORTADDR = 0x3F4, +}; + +/*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 + +#endif
Signed-off-by: Varka Bhadram <varkab@cdac.in> --- drivers/net/ieee802154/cc2520.c | 805 +++++++++++++++++++++++++++++++++++++++ include/linux/spi/cc2520.h | 176 +++++++++ 2 files changed, 981 insertions(+) create mode 100644 drivers/net/ieee802154/cc2520.c create mode 100644 include/linux/spi/cc2520.h