| /* |
| * AT86RF230/RF231 driver |
| * |
| * Copyright (C) 2009-2012 Siemens AG |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 |
| * as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * Written by: |
| * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com> |
| * Alexander Smirnov <alex.bluesman.smirnov@gmail.com> |
| * Alexander Aring <aar@pengutronix.de> |
| */ |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/hrtimer.h> |
| #include <linux/jiffies.h> |
| #include <linux/interrupt.h> |
| #include <linux/irq.h> |
| #include <linux/gpio.h> |
| #include <linux/delay.h> |
| #include <linux/spi/spi.h> |
| #include <linux/spi/at86rf230.h> |
| #include <linux/regmap.h> |
| #include <linux/skbuff.h> |
| #include <linux/of_gpio.h> |
| #include <linux/ieee802154.h> |
| |
| #include <net/mac802154.h> |
| #include <net/cfg802154.h> |
| |
| #include "at86rf230.h" |
| |
| struct at86rf230_local; |
| /* at86rf2xx chip depend data. |
| * All timings are in us. |
| */ |
| struct at86rf2xx_chip_data { |
| u16 t_sleep_cycle; |
| u16 t_channel_switch; |
| u16 t_reset_to_off; |
| u16 t_off_to_aack; |
| u16 t_off_to_tx_on; |
| u16 t_off_to_sleep; |
| u16 t_sleep_to_off; |
| u16 t_frame; |
| u16 t_p_ack; |
| int rssi_base_val; |
| |
| int (*set_channel)(struct at86rf230_local *, u8, u8); |
| int (*set_txpower)(struct at86rf230_local *, s32); |
| }; |
| |
| #define AT86RF2XX_MAX_BUF (127 + 3) |
| /* tx retries to access the TX_ON state |
| * if it's above then force change will be started. |
| * |
| * We assume the max_frame_retries (7) value of 802.15.4 here. |
| */ |
| #define AT86RF2XX_MAX_TX_RETRIES 7 |
| /* We use the recommended 5 minutes timeout to recalibrate */ |
| #define AT86RF2XX_CAL_LOOP_TIMEOUT (5 * 60 * HZ) |
| |
| struct at86rf230_state_change { |
| struct at86rf230_local *lp; |
| int irq; |
| |
| struct hrtimer timer; |
| struct spi_message msg; |
| struct spi_transfer trx; |
| u8 buf[AT86RF2XX_MAX_BUF]; |
| |
| void (*complete)(void *context); |
| u8 from_state; |
| u8 to_state; |
| |
| bool irq_enable; |
| }; |
| |
| struct at86rf230_local { |
| struct spi_device *spi; |
| |
| struct ieee802154_hw *hw; |
| struct at86rf2xx_chip_data *data; |
| struct regmap *regmap; |
| int slp_tr; |
| bool sleep; |
| |
| struct completion state_complete; |
| struct at86rf230_state_change state; |
| |
| struct at86rf230_state_change irq; |
| |
| unsigned long cal_timeout; |
| bool is_tx; |
| bool is_tx_from_off; |
| u8 tx_retry; |
| struct sk_buff *tx_skb; |
| struct at86rf230_state_change tx; |
| }; |
| |
| #define AT86RF2XX_NUMREGS 0x3F |
| |
| static void |
| at86rf230_async_state_change(struct at86rf230_local *lp, |
| struct at86rf230_state_change *ctx, |
| const u8 state, void (*complete)(void *context), |
| const bool irq_enable); |
| |
| static inline void |
| at86rf230_sleep(struct at86rf230_local *lp) |
| { |
| if (gpio_is_valid(lp->slp_tr)) { |
| gpio_set_value(lp->slp_tr, 1); |
| usleep_range(lp->data->t_off_to_sleep, |
| lp->data->t_off_to_sleep + 10); |
| lp->sleep = true; |
| } |
| } |
| |
| static inline void |
| at86rf230_awake(struct at86rf230_local *lp) |
| { |
| if (gpio_is_valid(lp->slp_tr)) { |
| gpio_set_value(lp->slp_tr, 0); |
| usleep_range(lp->data->t_sleep_to_off, |
| lp->data->t_sleep_to_off + 100); |
| lp->sleep = false; |
| } |
| } |
| |
| static inline int |
| __at86rf230_write(struct at86rf230_local *lp, |
| unsigned int addr, unsigned int data) |
| { |
| bool sleep = lp->sleep; |
| int ret; |
| |
| /* awake for register setting if sleep */ |
| if (sleep) |
| at86rf230_awake(lp); |
| |
| ret = regmap_write(lp->regmap, addr, data); |
| |
| /* sleep again if was sleeping */ |
| if (sleep) |
| at86rf230_sleep(lp); |
| |
| return ret; |
| } |
| |
| static inline int |
| __at86rf230_read(struct at86rf230_local *lp, |
| unsigned int addr, unsigned int *data) |
| { |
| bool sleep = lp->sleep; |
| int ret; |
| |
| /* awake for register setting if sleep */ |
| if (sleep) |
| at86rf230_awake(lp); |
| |
| ret = regmap_read(lp->regmap, addr, data); |
| |
| /* sleep again if was sleeping */ |
| if (sleep) |
| at86rf230_sleep(lp); |
| |
| return ret; |
| } |
| |
| static inline int |
| at86rf230_read_subreg(struct at86rf230_local *lp, |
| unsigned int addr, unsigned int mask, |
| unsigned int shift, unsigned int *data) |
| { |
| int rc; |
| |
| rc = __at86rf230_read(lp, addr, data); |
| if (!rc) |
| *data = (*data & mask) >> shift; |
| |
| return rc; |
| } |
| |
| static inline int |
| at86rf230_write_subreg(struct at86rf230_local *lp, |
| unsigned int addr, unsigned int mask, |
| unsigned int shift, unsigned int data) |
| { |
| bool sleep = lp->sleep; |
| int ret; |
| |
| /* awake for register setting if sleep */ |
| if (sleep) |
| at86rf230_awake(lp); |
| |
| ret = regmap_update_bits(lp->regmap, addr, mask, data << shift); |
| |
| /* sleep again if was sleeping */ |
| if (sleep) |
| at86rf230_sleep(lp); |
| |
| return ret; |
| } |
| |
| static inline void |
| at86rf230_slp_tr_rising_edge(struct at86rf230_local *lp) |
| { |
| gpio_set_value(lp->slp_tr, 1); |
| udelay(1); |
| gpio_set_value(lp->slp_tr, 0); |
| } |
| |
| static bool |
| at86rf230_reg_writeable(struct device *dev, unsigned int reg) |
| { |
| switch (reg) { |
| case RG_TRX_STATE: |
| case RG_TRX_CTRL_0: |
| case RG_TRX_CTRL_1: |
| case RG_PHY_TX_PWR: |
| case RG_PHY_ED_LEVEL: |
| case RG_PHY_CC_CCA: |
| case RG_CCA_THRES: |
| case RG_RX_CTRL: |
| case RG_SFD_VALUE: |
| case RG_TRX_CTRL_2: |
| case RG_ANT_DIV: |
| case RG_IRQ_MASK: |
| case RG_VREG_CTRL: |
| case RG_BATMON: |
| case RG_XOSC_CTRL: |
| case RG_RX_SYN: |
| case RG_XAH_CTRL_1: |
| case RG_FTN_CTRL: |
| case RG_PLL_CF: |
| case RG_PLL_DCU: |
| case RG_SHORT_ADDR_0: |
| case RG_SHORT_ADDR_1: |
| case RG_PAN_ID_0: |
| case RG_PAN_ID_1: |
| case RG_IEEE_ADDR_0: |
| case RG_IEEE_ADDR_1: |
| case RG_IEEE_ADDR_2: |
| case RG_IEEE_ADDR_3: |
| case RG_IEEE_ADDR_4: |
| case RG_IEEE_ADDR_5: |
| case RG_IEEE_ADDR_6: |
| case RG_IEEE_ADDR_7: |
| case RG_XAH_CTRL_0: |
| case RG_CSMA_SEED_0: |
| case RG_CSMA_SEED_1: |
| case RG_CSMA_BE: |
| return true; |
| default: |
| return false; |
| } |
| } |
| |
| static bool |
| at86rf230_reg_readable(struct device *dev, unsigned int reg) |
| { |
| bool rc; |
| |
| /* all writeable are also readable */ |
| rc = at86rf230_reg_writeable(dev, reg); |
| if (rc) |
| return rc; |
| |
| /* readonly regs */ |
| switch (reg) { |
| case RG_TRX_STATUS: |
| case RG_PHY_RSSI: |
| case RG_IRQ_STATUS: |
| case RG_PART_NUM: |
| case RG_VERSION_NUM: |
| case RG_MAN_ID_1: |
| case RG_MAN_ID_0: |
| return true; |
| default: |
| return false; |
| } |
| } |
| |
| static bool |
| at86rf230_reg_volatile(struct device *dev, unsigned int reg) |
| { |
| /* can be changed during runtime */ |
| switch (reg) { |
| case RG_TRX_STATUS: |
| case RG_TRX_STATE: |
| case RG_PHY_RSSI: |
| case RG_PHY_ED_LEVEL: |
| case RG_IRQ_STATUS: |
| case RG_VREG_CTRL: |
| case RG_PLL_CF: |
| case RG_PLL_DCU: |
| return true; |
| default: |
| return false; |
| } |
| } |
| |
| static bool |
| at86rf230_reg_precious(struct device *dev, unsigned int reg) |
| { |
| /* don't clear irq line on read */ |
| switch (reg) { |
| case RG_IRQ_STATUS: |
| return true; |
| default: |
| return false; |
| } |
| } |
| |
| static const struct regmap_config at86rf230_regmap_spi_config = { |
| .reg_bits = 8, |
| .val_bits = 8, |
| .write_flag_mask = CMD_REG | CMD_WRITE, |
| .read_flag_mask = CMD_REG, |
| .cache_type = REGCACHE_RBTREE, |
| .max_register = AT86RF2XX_NUMREGS, |
| .writeable_reg = at86rf230_reg_writeable, |
| .readable_reg = at86rf230_reg_readable, |
| .volatile_reg = at86rf230_reg_volatile, |
| .precious_reg = at86rf230_reg_precious, |
| }; |
| |
| static void |
| at86rf230_async_error_recover(void *context) |
| { |
| struct at86rf230_state_change *ctx = context; |
| struct at86rf230_local *lp = ctx->lp; |
| |
| lp->is_tx = 0; |
| at86rf230_async_state_change(lp, ctx, STATE_RX_AACK_ON, NULL, false); |
| ieee802154_wake_queue(lp->hw); |
| } |
| |
| static inline void |
| at86rf230_async_error(struct at86rf230_local *lp, |
| struct at86rf230_state_change *ctx, int rc) |
| { |
| dev_err(&lp->spi->dev, "spi_async error %d\n", rc); |
| |
| at86rf230_async_state_change(lp, ctx, STATE_FORCE_TRX_OFF, |
| at86rf230_async_error_recover, false); |
| } |
| |
| /* Generic function to get some register value in async mode */ |
| static void |
| at86rf230_async_read_reg(struct at86rf230_local *lp, const u8 reg, |
| struct at86rf230_state_change *ctx, |
| void (*complete)(void *context), |
| const bool irq_enable) |
| { |
| int rc; |
| |
| u8 *tx_buf = ctx->buf; |
| |
| tx_buf[0] = (reg & CMD_REG_MASK) | CMD_REG; |
| ctx->msg.complete = complete; |
| ctx->irq_enable = irq_enable; |
| rc = spi_async(lp->spi, &ctx->msg); |
| if (rc) { |
| if (irq_enable) |
| enable_irq(ctx->irq); |
| |
| at86rf230_async_error(lp, ctx, rc); |
| } |
| } |
| |
| static inline u8 at86rf230_state_to_force(u8 state) |
| { |
| if (state == STATE_TX_ON) |
| return STATE_FORCE_TX_ON; |
| else |
| return STATE_FORCE_TRX_OFF; |
| } |
| |
| static void |
| at86rf230_async_state_assert(void *context) |
| { |
| struct at86rf230_state_change *ctx = context; |
| struct at86rf230_local *lp = ctx->lp; |
| const u8 *buf = ctx->buf; |
| const u8 trx_state = buf[1] & TRX_STATE_MASK; |
| |
| /* Assert state change */ |
| if (trx_state != ctx->to_state) { |
| /* Special handling if transceiver state is in |
| * STATE_BUSY_RX_AACK and a SHR was detected. |
| */ |
| if (trx_state == STATE_BUSY_RX_AACK) { |
| /* Undocumented race condition. If we send a state |
| * change to STATE_RX_AACK_ON the transceiver could |
| * change his state automatically to STATE_BUSY_RX_AACK |
| * if a SHR was detected. This is not an error, but we |
| * can't assert this. |
| */ |
| if (ctx->to_state == STATE_RX_AACK_ON) |
| goto done; |
| |
| /* If we change to STATE_TX_ON without forcing and |
| * transceiver state is STATE_BUSY_RX_AACK, we wait |
| * 'tFrame + tPAck' receiving time. In this time the |
| * PDU should be received. If the transceiver is still |
| * in STATE_BUSY_RX_AACK, we run a force state change |
| * to STATE_TX_ON. This is a timeout handling, if the |
| * transceiver stucks in STATE_BUSY_RX_AACK. |
| * |
| * Additional we do several retries to try to get into |
| * TX_ON state without forcing. If the retries are |
| * higher or equal than AT86RF2XX_MAX_TX_RETRIES we |
| * will do a force change. |
| */ |
| if (ctx->to_state == STATE_TX_ON || |
| ctx->to_state == STATE_TRX_OFF) { |
| u8 state = ctx->to_state; |
| |
| if (lp->tx_retry >= AT86RF2XX_MAX_TX_RETRIES) |
| state = at86rf230_state_to_force(state); |
| lp->tx_retry++; |
| |
| at86rf230_async_state_change(lp, ctx, state, |
| ctx->complete, |
| ctx->irq_enable); |
| return; |
| } |
| } |
| |
| dev_warn(&lp->spi->dev, "unexcept state change from 0x%02x to 0x%02x. Actual state: 0x%02x\n", |
| ctx->from_state, ctx->to_state, trx_state); |
| } |
| |
| done: |
| if (ctx->complete) |
| ctx->complete(context); |
| } |
| |
| static enum hrtimer_restart at86rf230_async_state_timer(struct hrtimer *timer) |
| { |
| struct at86rf230_state_change *ctx = |
| container_of(timer, struct at86rf230_state_change, timer); |
| struct at86rf230_local *lp = ctx->lp; |
| |
| at86rf230_async_read_reg(lp, RG_TRX_STATUS, ctx, |
| at86rf230_async_state_assert, |
| ctx->irq_enable); |
| |
| return HRTIMER_NORESTART; |
| } |
| |
| /* Do state change timing delay. */ |
| static void |
| at86rf230_async_state_delay(void *context) |
| { |
| struct at86rf230_state_change *ctx = context; |
| struct at86rf230_local *lp = ctx->lp; |
| struct at86rf2xx_chip_data *c = lp->data; |
| bool force = false; |
| ktime_t tim; |
| |
| /* The force state changes are will show as normal states in the |
| * state status subregister. We change the to_state to the |
| * corresponding one and remember if it was a force change, this |
| * differs if we do a state change from STATE_BUSY_RX_AACK. |
| */ |
| switch (ctx->to_state) { |
| case STATE_FORCE_TX_ON: |
| ctx->to_state = STATE_TX_ON; |
| force = true; |
| break; |
| case STATE_FORCE_TRX_OFF: |
| ctx->to_state = STATE_TRX_OFF; |
| force = true; |
| break; |
| default: |
| break; |
| } |
| |
| switch (ctx->from_state) { |
| case STATE_TRX_OFF: |
| switch (ctx->to_state) { |
| case STATE_RX_AACK_ON: |
| tim = ktime_set(0, c->t_off_to_aack * NSEC_PER_USEC); |
| /* state change from TRX_OFF to RX_AACK_ON to do a |
| * calibration, we need to reset the timeout for the |
| * next one. |
| */ |
| lp->cal_timeout = jiffies + AT86RF2XX_CAL_LOOP_TIMEOUT; |
| goto change; |
| case STATE_TX_ARET_ON: |
| case STATE_TX_ON: |
| tim = ktime_set(0, c->t_off_to_tx_on * NSEC_PER_USEC); |
| /* state change from TRX_OFF to TX_ON or ARET_ON to do |
| * a calibration, we need to reset the timeout for the |
| * next one. |
| */ |
| lp->cal_timeout = jiffies + AT86RF2XX_CAL_LOOP_TIMEOUT; |
| goto change; |
| default: |
| break; |
| } |
| break; |
| case STATE_BUSY_RX_AACK: |
| switch (ctx->to_state) { |
| case STATE_TRX_OFF: |
| case STATE_TX_ON: |
| /* Wait for worst case receiving time if we |
| * didn't make a force change from BUSY_RX_AACK |
| * to TX_ON or TRX_OFF. |
| */ |
| if (!force) { |
| tim = ktime_set(0, (c->t_frame + c->t_p_ack) * |
| NSEC_PER_USEC); |
| goto change; |
| } |
| break; |
| default: |
| break; |
| } |
| break; |
| /* Default value, means RESET state */ |
| case STATE_P_ON: |
| switch (ctx->to_state) { |
| case STATE_TRX_OFF: |
| tim = ktime_set(0, c->t_reset_to_off * NSEC_PER_USEC); |
| goto change; |
| default: |
| break; |
| } |
| break; |
| default: |
| break; |
| } |
| |
| /* Default delay is 1us in the most cases */ |
| udelay(1); |
| at86rf230_async_state_timer(&ctx->timer); |
| return; |
| |
| change: |
| hrtimer_start(&ctx->timer, tim, HRTIMER_MODE_REL); |
| } |
| |
| static void |
| at86rf230_async_state_change_start(void *context) |
| { |
| struct at86rf230_state_change *ctx = context; |
| struct at86rf230_local *lp = ctx->lp; |
| u8 *buf = ctx->buf; |
| const u8 trx_state = buf[1] & TRX_STATE_MASK; |
| int rc; |
| |
| /* Check for "possible" STATE_TRANSITION_IN_PROGRESS */ |
| if (trx_state == STATE_TRANSITION_IN_PROGRESS) { |
| udelay(1); |
| at86rf230_async_read_reg(lp, RG_TRX_STATUS, ctx, |
| at86rf230_async_state_change_start, |
| ctx->irq_enable); |
| return; |
| } |
| |
| /* Check if we already are in the state which we change in */ |
| if (trx_state == ctx->to_state) { |
| if (ctx->complete) |
| ctx->complete(context); |
| return; |
| } |
| |
| /* Set current state to the context of state change */ |
| ctx->from_state = trx_state; |
| |
| /* Going into the next step for a state change which do a timing |
| * relevant delay. |
| */ |
| buf[0] = (RG_TRX_STATE & CMD_REG_MASK) | CMD_REG | CMD_WRITE; |
| buf[1] = ctx->to_state; |
| ctx->msg.complete = at86rf230_async_state_delay; |
| rc = spi_async(lp->spi, &ctx->msg); |
| if (rc) { |
| if (ctx->irq_enable) |
| enable_irq(ctx->irq); |
| |
| at86rf230_async_error(lp, ctx, rc); |
| } |
| } |
| |
| static void |
| at86rf230_async_state_change(struct at86rf230_local *lp, |
| struct at86rf230_state_change *ctx, |
| const u8 state, void (*complete)(void *context), |
| const bool irq_enable) |
| { |
| /* Initialization for the state change context */ |
| ctx->to_state = state; |
| ctx->complete = complete; |
| ctx->irq_enable = irq_enable; |
| at86rf230_async_read_reg(lp, RG_TRX_STATUS, ctx, |
| at86rf230_async_state_change_start, |
| irq_enable); |
| } |
| |
| static void |
| at86rf230_sync_state_change_complete(void *context) |
| { |
| struct at86rf230_state_change *ctx = context; |
| struct at86rf230_local *lp = ctx->lp; |
| |
| complete(&lp->state_complete); |
| } |
| |
| /* This function do a sync framework above the async state change. |
| * Some callbacks of the IEEE 802.15.4 driver interface need to be |
| * handled synchronously. |
| */ |
| static int |
| at86rf230_sync_state_change(struct at86rf230_local *lp, unsigned int state) |
| { |
| unsigned long rc; |
| |
| at86rf230_async_state_change(lp, &lp->state, state, |
| at86rf230_sync_state_change_complete, |
| false); |
| |
| rc = wait_for_completion_timeout(&lp->state_complete, |
| msecs_to_jiffies(100)); |
| if (!rc) { |
| at86rf230_async_error(lp, &lp->state, -ETIMEDOUT); |
| return -ETIMEDOUT; |
| } |
| |
| return 0; |
| } |
| |
| static void |
| at86rf230_tx_complete(void *context) |
| { |
| struct at86rf230_state_change *ctx = context; |
| struct at86rf230_local *lp = ctx->lp; |
| |
| enable_irq(ctx->irq); |
| |
| ieee802154_xmit_complete(lp->hw, lp->tx_skb, false); |
| } |
| |
| static void |
| at86rf230_tx_on(void *context) |
| { |
| struct at86rf230_state_change *ctx = context; |
| struct at86rf230_local *lp = ctx->lp; |
| |
| at86rf230_async_state_change(lp, ctx, STATE_RX_AACK_ON, |
| at86rf230_tx_complete, true); |
| } |
| |
| static void |
| at86rf230_tx_trac_check(void *context) |
| { |
| struct at86rf230_state_change *ctx = context; |
| struct at86rf230_local *lp = ctx->lp; |
| const u8 *buf = ctx->buf; |
| const u8 trac = (buf[1] & 0xe0) >> 5; |
| |
| /* If trac status is different than zero we need to do a state change |
| * to STATE_FORCE_TRX_OFF then STATE_RX_AACK_ON to recover the |
| * transceiver. |
| */ |
| if (trac) |
| at86rf230_async_state_change(lp, ctx, STATE_FORCE_TRX_OFF, |
| at86rf230_tx_on, true); |
| else |
| at86rf230_tx_on(context); |
| } |
| |
| static void |
| at86rf230_tx_trac_status(void *context) |
| { |
| struct at86rf230_state_change *ctx = context; |
| struct at86rf230_local *lp = ctx->lp; |
| |
| at86rf230_async_read_reg(lp, RG_TRX_STATE, ctx, |
| at86rf230_tx_trac_check, true); |
| } |
| |
| static void |
| at86rf230_rx_read_frame_complete(void *context) |
| { |
| struct at86rf230_state_change *ctx = context; |
| struct at86rf230_local *lp = ctx->lp; |
| u8 rx_local_buf[AT86RF2XX_MAX_BUF]; |
| const u8 *buf = ctx->buf; |
| struct sk_buff *skb; |
| u8 len, lqi; |
| |
| len = buf[1]; |
| if (!ieee802154_is_valid_psdu_len(len)) { |
| dev_vdbg(&lp->spi->dev, "corrupted frame received\n"); |
| len = IEEE802154_MTU; |
| } |
| lqi = buf[2 + len]; |
| |
| memcpy(rx_local_buf, buf + 2, len); |
| ctx->trx.len = 2; |
| enable_irq(ctx->irq); |
| |
| skb = dev_alloc_skb(IEEE802154_MTU); |
| if (!skb) { |
| dev_vdbg(&lp->spi->dev, "failed to allocate sk_buff\n"); |
| return; |
| } |
| |
| memcpy(skb_put(skb, len), rx_local_buf, len); |
| ieee802154_rx_irqsafe(lp->hw, skb, lqi); |
| } |
| |
| static void |
| at86rf230_rx_read_frame(void *context) |
| { |
| struct at86rf230_state_change *ctx = context; |
| struct at86rf230_local *lp = ctx->lp; |
| u8 *buf = ctx->buf; |
| int rc; |
| |
| buf[0] = CMD_FB; |
| ctx->trx.len = AT86RF2XX_MAX_BUF; |
| ctx->msg.complete = at86rf230_rx_read_frame_complete; |
| rc = spi_async(lp->spi, &ctx->msg); |
| if (rc) { |
| ctx->trx.len = 2; |
| enable_irq(ctx->irq); |
| at86rf230_async_error(lp, ctx, rc); |
| } |
| } |
| |
| static void |
| at86rf230_rx_trac_check(void *context) |
| { |
| /* Possible check on trac status here. This could be useful to make |
| * some stats why receive is failed. Not used at the moment, but it's |
| * maybe timing relevant. Datasheet doesn't say anything about this. |
| * The programming guide say do it so. |
| */ |
| |
| at86rf230_rx_read_frame(context); |
| } |
| |
| static void |
| at86rf230_irq_trx_end(struct at86rf230_local *lp) |
| { |
| if (lp->is_tx) { |
| lp->is_tx = 0; |
| at86rf230_async_state_change(lp, &lp->irq, |
| STATE_FORCE_TX_ON, |
| at86rf230_tx_trac_status, |
| true); |
| } else { |
| at86rf230_async_read_reg(lp, RG_TRX_STATE, &lp->irq, |
| at86rf230_rx_trac_check, true); |
| } |
| } |
| |
| static void |
| at86rf230_irq_status(void *context) |
| { |
| struct at86rf230_state_change *ctx = context; |
| struct at86rf230_local *lp = ctx->lp; |
| const u8 *buf = ctx->buf; |
| const u8 irq = buf[1]; |
| |
| if (irq & IRQ_TRX_END) { |
| at86rf230_irq_trx_end(lp); |
| } else { |
| enable_irq(ctx->irq); |
| dev_err(&lp->spi->dev, "not supported irq %02x received\n", |
| irq); |
| } |
| } |
| |
| static irqreturn_t at86rf230_isr(int irq, void *data) |
| { |
| struct at86rf230_local *lp = data; |
| struct at86rf230_state_change *ctx = &lp->irq; |
| u8 *buf = ctx->buf; |
| int rc; |
| |
| disable_irq_nosync(irq); |
| |
| buf[0] = (RG_IRQ_STATUS & CMD_REG_MASK) | CMD_REG; |
| ctx->msg.complete = at86rf230_irq_status; |
| rc = spi_async(lp->spi, &ctx->msg); |
| if (rc) { |
| enable_irq(irq); |
| at86rf230_async_error(lp, ctx, rc); |
| return IRQ_NONE; |
| } |
| |
| return IRQ_HANDLED; |
| } |
| |
| static void |
| at86rf230_write_frame_complete(void *context) |
| { |
| struct at86rf230_state_change *ctx = context; |
| struct at86rf230_local *lp = ctx->lp; |
| u8 *buf = ctx->buf; |
| int rc; |
| |
| ctx->trx.len = 2; |
| |
| if (gpio_is_valid(lp->slp_tr)) { |
| at86rf230_slp_tr_rising_edge(lp); |
| } else { |
| buf[0] = (RG_TRX_STATE & CMD_REG_MASK) | CMD_REG | CMD_WRITE; |
| buf[1] = STATE_BUSY_TX; |
| ctx->msg.complete = NULL; |
| rc = spi_async(lp->spi, &ctx->msg); |
| if (rc) |
| at86rf230_async_error(lp, ctx, rc); |
| } |
| } |
| |
| static void |
| at86rf230_write_frame(void *context) |
| { |
| struct at86rf230_state_change *ctx = context; |
| struct at86rf230_local *lp = ctx->lp; |
| struct sk_buff *skb = lp->tx_skb; |
| u8 *buf = ctx->buf; |
| int rc; |
| |
| lp->is_tx = 1; |
| |
| buf[0] = CMD_FB | CMD_WRITE; |
| buf[1] = skb->len + 2; |
| memcpy(buf + 2, skb->data, skb->len); |
| ctx->trx.len = skb->len + 2; |
| ctx->msg.complete = at86rf230_write_frame_complete; |
| rc = spi_async(lp->spi, &ctx->msg); |
| if (rc) { |
| ctx->trx.len = 2; |
| at86rf230_async_error(lp, ctx, rc); |
| } |
| } |
| |
| static void |
| at86rf230_xmit_tx_on(void *context) |
| { |
| struct at86rf230_state_change *ctx = context; |
| struct at86rf230_local *lp = ctx->lp; |
| |
| at86rf230_async_state_change(lp, ctx, STATE_TX_ARET_ON, |
| at86rf230_write_frame, false); |
| } |
| |
| static void |
| at86rf230_xmit_start(void *context) |
| { |
| struct at86rf230_state_change *ctx = context; |
| struct at86rf230_local *lp = ctx->lp; |
| |
| /* check if we change from off state */ |
| if (lp->is_tx_from_off) { |
| lp->is_tx_from_off = false; |
| at86rf230_async_state_change(lp, ctx, STATE_TX_ARET_ON, |
| at86rf230_write_frame, |
| false); |
| } else { |
| at86rf230_async_state_change(lp, ctx, STATE_TX_ON, |
| at86rf230_xmit_tx_on, |
| false); |
| } |
| } |
| |
| static int |
| at86rf230_xmit(struct ieee802154_hw *hw, struct sk_buff *skb) |
| { |
| struct at86rf230_local *lp = hw->priv; |
| struct at86rf230_state_change *ctx = &lp->tx; |
| |
| lp->tx_skb = skb; |
| lp->tx_retry = 0; |
| |
| /* After 5 minutes in PLL and the same frequency we run again the |
| * calibration loops which is recommended by at86rf2xx datasheets. |
| * |
| * The calibration is initiate by a state change from TRX_OFF |
| * to TX_ON, the lp->cal_timeout should be reinit by state_delay |
| * function then to start in the next 5 minutes. |
| */ |
| if (time_is_before_jiffies(lp->cal_timeout)) { |
| lp->is_tx_from_off = true; |
| at86rf230_async_state_change(lp, ctx, STATE_TRX_OFF, |
| at86rf230_xmit_start, false); |
| } else { |
| at86rf230_xmit_start(ctx); |
| } |
| |
| return 0; |
| } |
| |
| static int |
| at86rf230_ed(struct ieee802154_hw *hw, u8 *level) |
| { |
| BUG_ON(!level); |
| *level = 0xbe; |
| return 0; |
| } |
| |
| static int |
| at86rf230_start(struct ieee802154_hw *hw) |
| { |
| struct at86rf230_local *lp = hw->priv; |
| |
| at86rf230_awake(lp); |
| enable_irq(lp->spi->irq); |
| |
| return at86rf230_sync_state_change(lp, STATE_RX_AACK_ON); |
| } |
| |
| static void |
| at86rf230_stop(struct ieee802154_hw *hw) |
| { |
| struct at86rf230_local *lp = hw->priv; |
| u8 csma_seed[2]; |
| |
| at86rf230_sync_state_change(lp, STATE_FORCE_TRX_OFF); |
| |
| disable_irq(lp->spi->irq); |
| |
| /* It's recommended to set random new csma_seeds before sleep state. |
| * Makes only sense in the stop callback, not doing this inside of |
| * at86rf230_sleep, this is also used when we don't transmit afterwards |
| * when calling start callback again. |
| */ |
| get_random_bytes(csma_seed, ARRAY_SIZE(csma_seed)); |
| at86rf230_write_subreg(lp, SR_CSMA_SEED_0, csma_seed[0]); |
| at86rf230_write_subreg(lp, SR_CSMA_SEED_1, csma_seed[1]); |
| |
| at86rf230_sleep(lp); |
| } |
| |
| static int |
| at86rf23x_set_channel(struct at86rf230_local *lp, u8 page, u8 channel) |
| { |
| return at86rf230_write_subreg(lp, SR_CHANNEL, channel); |
| } |
| |
| #define AT86RF2XX_MAX_ED_LEVELS 0xF |
| static const s32 at86rf23x_ed_levels[AT86RF2XX_MAX_ED_LEVELS + 1] = { |
| -9100, -8900, -8700, -8500, -8300, -8100, -7900, -7700, -7500, -7300, |
| -7100, -6900, -6700, -6500, -6300, -6100, |
| }; |
| |
| static const s32 at86rf212_ed_levels_100[AT86RF2XX_MAX_ED_LEVELS + 1] = { |
| -10000, -9800, -9600, -9400, -9200, -9000, -8800, -8600, -8400, -8200, |
| -8000, -7800, -7600, -7400, -7200, -7000, |
| }; |
| |
| static const s32 at86rf212_ed_levels_98[AT86RF2XX_MAX_ED_LEVELS + 1] = { |
| -9800, -9600, -9400, -9200, -9000, -8800, -8600, -8400, -8200, -8000, |
| -7800, -7600, -7400, -7200, -7000, -6800, |
| }; |
| |
| static inline int |
| at86rf212_update_cca_ed_level(struct at86rf230_local *lp, int rssi_base_val) |
| { |
| unsigned int cca_ed_thres; |
| int rc; |
| |
| rc = at86rf230_read_subreg(lp, SR_CCA_ED_THRES, &cca_ed_thres); |
| if (rc < 0) |
| return rc; |
| |
| switch (rssi_base_val) { |
| case -98: |
| lp->hw->phy->supported.cca_ed_levels = at86rf212_ed_levels_98; |
| lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf212_ed_levels_98); |
| lp->hw->phy->cca_ed_level = at86rf212_ed_levels_98[cca_ed_thres]; |
| break; |
| case -100: |
| lp->hw->phy->supported.cca_ed_levels = at86rf212_ed_levels_100; |
| lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf212_ed_levels_100); |
| lp->hw->phy->cca_ed_level = at86rf212_ed_levels_100[cca_ed_thres]; |
| break; |
| default: |
| WARN_ON(1); |
| } |
| |
| return 0; |
| } |
| |
| static int |
| at86rf212_set_channel(struct at86rf230_local *lp, u8 page, u8 channel) |
| { |
| int rc; |
| |
| if (channel == 0) |
| rc = at86rf230_write_subreg(lp, SR_SUB_MODE, 0); |
| else |
| rc = at86rf230_write_subreg(lp, SR_SUB_MODE, 1); |
| if (rc < 0) |
| return rc; |
| |
| if (page == 0) { |
| rc = at86rf230_write_subreg(lp, SR_BPSK_QPSK, 0); |
| lp->data->rssi_base_val = -100; |
| } else { |
| rc = at86rf230_write_subreg(lp, SR_BPSK_QPSK, 1); |
| lp->data->rssi_base_val = -98; |
| } |
| if (rc < 0) |
| return rc; |
| |
| rc = at86rf212_update_cca_ed_level(lp, lp->data->rssi_base_val); |
| if (rc < 0) |
| return rc; |
| |
| /* This sets the symbol_duration according frequency on the 212. |
| * TODO move this handling while set channel and page in cfg802154. |
| * We can do that, this timings are according 802.15.4 standard. |
| * If we do that in cfg802154, this is a more generic calculation. |
| * |
| * This should also protected from ifs_timer. Means cancel timer and |
| * init with a new value. For now, this is okay. |
| */ |
| if (channel == 0) { |
| if (page == 0) { |
| /* SUB:0 and BPSK:0 -> BPSK-20 */ |
| lp->hw->phy->symbol_duration = 50; |
| } else { |
| /* SUB:1 and BPSK:0 -> BPSK-40 */ |
| lp->hw->phy->symbol_duration = 25; |
| } |
| } else { |
| if (page == 0) |
| /* SUB:0 and BPSK:1 -> OQPSK-100/200/400 */ |
| lp->hw->phy->symbol_duration = 40; |
| else |
| /* SUB:1 and BPSK:1 -> OQPSK-250/500/1000 */ |
| lp->hw->phy->symbol_duration = 16; |
| } |
| |
| lp->hw->phy->lifs_period = IEEE802154_LIFS_PERIOD * |
| lp->hw->phy->symbol_duration; |
| lp->hw->phy->sifs_period = IEEE802154_SIFS_PERIOD * |
| lp->hw->phy->symbol_duration; |
| |
| return at86rf230_write_subreg(lp, SR_CHANNEL, channel); |
| } |
| |
| static int |
| at86rf230_channel(struct ieee802154_hw *hw, u8 page, u8 channel) |
| { |
| struct at86rf230_local *lp = hw->priv; |
| int rc; |
| |
| rc = lp->data->set_channel(lp, page, channel); |
| /* Wait for PLL */ |
| usleep_range(lp->data->t_channel_switch, |
| lp->data->t_channel_switch + 10); |
| |
| lp->cal_timeout = jiffies + AT86RF2XX_CAL_LOOP_TIMEOUT; |
| return rc; |
| } |
| |
| static int |
| at86rf230_set_hw_addr_filt(struct ieee802154_hw *hw, |
| struct ieee802154_hw_addr_filt *filt, |
| unsigned long changed) |
| { |
| struct at86rf230_local *lp = hw->priv; |
| |
| if (changed & IEEE802154_AFILT_SADDR_CHANGED) { |
| u16 addr = le16_to_cpu(filt->short_addr); |
| |
| dev_vdbg(&lp->spi->dev, |
| "at86rf230_set_hw_addr_filt called for saddr\n"); |
| __at86rf230_write(lp, RG_SHORT_ADDR_0, addr); |
| __at86rf230_write(lp, RG_SHORT_ADDR_1, addr >> 8); |
| } |
| |
| if (changed & IEEE802154_AFILT_PANID_CHANGED) { |
| u16 pan = le16_to_cpu(filt->pan_id); |
| |
| dev_vdbg(&lp->spi->dev, |
| "at86rf230_set_hw_addr_filt called for pan id\n"); |
| __at86rf230_write(lp, RG_PAN_ID_0, pan); |
| __at86rf230_write(lp, RG_PAN_ID_1, pan >> 8); |
| } |
| |
| if (changed & IEEE802154_AFILT_IEEEADDR_CHANGED) { |
| u8 i, addr[8]; |
| |
| memcpy(addr, &filt->ieee_addr, 8); |
| dev_vdbg(&lp->spi->dev, |
| "at86rf230_set_hw_addr_filt called for IEEE addr\n"); |
| for (i = 0; i < 8; i++) |
| __at86rf230_write(lp, RG_IEEE_ADDR_0 + i, addr[i]); |
| } |
| |
| if (changed & IEEE802154_AFILT_PANC_CHANGED) { |
| dev_vdbg(&lp->spi->dev, |
| "at86rf230_set_hw_addr_filt called for panc change\n"); |
| if (filt->pan_coord) |
| at86rf230_write_subreg(lp, SR_AACK_I_AM_COORD, 1); |
| else |
| at86rf230_write_subreg(lp, SR_AACK_I_AM_COORD, 0); |
| } |
| |
| return 0; |
| } |
| |
| #define AT86RF23X_MAX_TX_POWERS 0xF |
| static const s32 at86rf233_powers[AT86RF23X_MAX_TX_POWERS + 1] = { |
| 400, 370, 340, 300, 250, 200, 100, 0, -100, -200, -300, -400, -600, |
| -800, -1200, -1700, |
| }; |
| |
| static const s32 at86rf231_powers[AT86RF23X_MAX_TX_POWERS + 1] = { |
| 300, 280, 230, 180, 130, 70, 0, -100, -200, -300, -400, -500, -700, |
| -900, -1200, -1700, |
| }; |
| |
| #define AT86RF212_MAX_TX_POWERS 0x1F |
| static const s32 at86rf212_powers[AT86RF212_MAX_TX_POWERS + 1] = { |
| 500, 400, 300, 200, 100, 0, -100, -200, -300, -400, -500, -600, -700, |
| -800, -900, -1000, -1100, -1200, -1300, -1400, -1500, -1600, -1700, |
| -1800, -1900, -2000, -2100, -2200, -2300, -2400, -2500, -2600, |
| }; |
| |
| static int |
| at86rf23x_set_txpower(struct at86rf230_local *lp, s32 mbm) |
| { |
| u32 i; |
| |
| for (i = 0; i < lp->hw->phy->supported.tx_powers_size; i++) { |
| if (lp->hw->phy->supported.tx_powers[i] == mbm) |
| return at86rf230_write_subreg(lp, SR_TX_PWR_23X, i); |
| } |
| |
| return -EINVAL; |
| } |
| |
| static int |
| at86rf212_set_txpower(struct at86rf230_local *lp, s32 mbm) |
| { |
| u32 i; |
| |
| for (i = 0; i < lp->hw->phy->supported.tx_powers_size; i++) { |
| if (lp->hw->phy->supported.tx_powers[i] == mbm) |
| return at86rf230_write_subreg(lp, SR_TX_PWR_212, i); |
| } |
| |
| return -EINVAL; |
| } |
| |
| static int |
| at86rf230_set_txpower(struct ieee802154_hw *hw, s32 mbm) |
| { |
| struct at86rf230_local *lp = hw->priv; |
| |
| return lp->data->set_txpower(lp, mbm); |
| } |
| |
| static int |
| at86rf230_set_lbt(struct ieee802154_hw *hw, bool on) |
| { |
| struct at86rf230_local *lp = hw->priv; |
| |
| return at86rf230_write_subreg(lp, SR_CSMA_LBT_MODE, on); |
| } |
| |
| static int |
| at86rf230_set_cca_mode(struct ieee802154_hw *hw, |
| const struct wpan_phy_cca *cca) |
| { |
| struct at86rf230_local *lp = hw->priv; |
| u8 val; |
| |
| /* mapping 802.15.4 to driver spec */ |
| switch (cca->mode) { |
| case NL802154_CCA_ENERGY: |
| val = 1; |
| break; |
| case NL802154_CCA_CARRIER: |
| val = 2; |
| break; |
| case NL802154_CCA_ENERGY_CARRIER: |
| switch (cca->opt) { |
| case NL802154_CCA_OPT_ENERGY_CARRIER_AND: |
| val = 3; |
| break; |
| case NL802154_CCA_OPT_ENERGY_CARRIER_OR: |
| val = 0; |
| break; |
| default: |
| return -EINVAL; |
| } |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| return at86rf230_write_subreg(lp, SR_CCA_MODE, val); |
| } |
| |
| |
| static int |
| at86rf230_set_cca_ed_level(struct ieee802154_hw *hw, s32 mbm) |
| { |
| struct at86rf230_local *lp = hw->priv; |
| u32 i; |
| |
| for (i = 0; i < hw->phy->supported.cca_ed_levels_size; i++) { |
| if (hw->phy->supported.cca_ed_levels[i] == mbm) |
| return at86rf230_write_subreg(lp, SR_CCA_ED_THRES, i); |
| } |
| |
| return -EINVAL; |
| } |
| |
| static int |
| at86rf230_set_csma_params(struct ieee802154_hw *hw, u8 min_be, u8 max_be, |
| u8 retries) |
| { |
| struct at86rf230_local *lp = hw->priv; |
| int rc; |
| |
| rc = at86rf230_write_subreg(lp, SR_MIN_BE, min_be); |
| if (rc) |
| return rc; |
| |
| rc = at86rf230_write_subreg(lp, SR_MAX_BE, max_be); |
| if (rc) |
| return rc; |
| |
| return at86rf230_write_subreg(lp, SR_MAX_CSMA_RETRIES, retries); |
| } |
| |
| static int |
| at86rf230_set_frame_retries(struct ieee802154_hw *hw, s8 retries) |
| { |
| struct at86rf230_local *lp = hw->priv; |
| |
| return at86rf230_write_subreg(lp, SR_MAX_FRAME_RETRIES, retries); |
| } |
| |
| static int |
| at86rf230_set_promiscuous_mode(struct ieee802154_hw *hw, const bool on) |
| { |
| struct at86rf230_local *lp = hw->priv; |
| int rc; |
| |
| if (on) { |
| rc = at86rf230_write_subreg(lp, SR_AACK_DIS_ACK, 1); |
| if (rc < 0) |
| return rc; |
| |
| rc = at86rf230_write_subreg(lp, SR_AACK_PROM_MODE, 1); |
| if (rc < 0) |
| return rc; |
| } else { |
| rc = at86rf230_write_subreg(lp, SR_AACK_PROM_MODE, 0); |
| if (rc < 0) |
| return rc; |
| |
| rc = at86rf230_write_subreg(lp, SR_AACK_DIS_ACK, 0); |
| if (rc < 0) |
| return rc; |
| } |
| |
| return 0; |
| } |
| |
| static const struct ieee802154_ops at86rf230_ops = { |
| .owner = THIS_MODULE, |
| .xmit_async = at86rf230_xmit, |
| .ed = at86rf230_ed, |
| .set_channel = at86rf230_channel, |
| .start = at86rf230_start, |
| .stop = at86rf230_stop, |
| .set_hw_addr_filt = at86rf230_set_hw_addr_filt, |
| .set_txpower = at86rf230_set_txpower, |
| .set_lbt = at86rf230_set_lbt, |
| .set_cca_mode = at86rf230_set_cca_mode, |
| .set_cca_ed_level = at86rf230_set_cca_ed_level, |
| .set_csma_params = at86rf230_set_csma_params, |
| .set_frame_retries = at86rf230_set_frame_retries, |
| .set_promiscuous_mode = at86rf230_set_promiscuous_mode, |
| }; |
| |
| static struct at86rf2xx_chip_data at86rf233_data = { |
| .t_sleep_cycle = 330, |
| .t_channel_switch = 11, |
| .t_reset_to_off = 26, |
| .t_off_to_aack = 80, |
| .t_off_to_tx_on = 80, |
| .t_off_to_sleep = 35, |
| .t_sleep_to_off = 210, |
| .t_frame = 4096, |
| .t_p_ack = 545, |
| .rssi_base_val = -91, |
| .set_channel = at86rf23x_set_channel, |
| .set_txpower = at86rf23x_set_txpower, |
| }; |
| |
| static struct at86rf2xx_chip_data at86rf231_data = { |
| .t_sleep_cycle = 330, |
| .t_channel_switch = 24, |
| .t_reset_to_off = 37, |
| .t_off_to_aack = 110, |
| .t_off_to_tx_on = 110, |
| .t_off_to_sleep = 35, |
| .t_sleep_to_off = 380, |
| .t_frame = 4096, |
| .t_p_ack = 545, |
| .rssi_base_val = -91, |
| .set_channel = at86rf23x_set_channel, |
| .set_txpower = at86rf23x_set_txpower, |
| }; |
| |
| static struct at86rf2xx_chip_data at86rf212_data = { |
| .t_sleep_cycle = 330, |
| .t_channel_switch = 11, |
| .t_reset_to_off = 26, |
| .t_off_to_aack = 200, |
| .t_off_to_tx_on = 200, |
| .t_off_to_sleep = 35, |
| .t_sleep_to_off = 380, |
| .t_frame = 4096, |
| .t_p_ack = 545, |
| .rssi_base_val = -100, |
| .set_channel = at86rf212_set_channel, |
| .set_txpower = at86rf212_set_txpower, |
| }; |
| |
| static int at86rf230_hw_init(struct at86rf230_local *lp, u8 xtal_trim) |
| { |
| int rc, irq_type, irq_pol = IRQ_ACTIVE_HIGH; |
| unsigned int dvdd; |
| u8 csma_seed[2]; |
| |
| rc = at86rf230_sync_state_change(lp, STATE_FORCE_TRX_OFF); |
| if (rc) |
| return rc; |
| |
| irq_type = irq_get_trigger_type(lp->spi->irq); |
| if (irq_type == IRQ_TYPE_EDGE_RISING || |
| irq_type == IRQ_TYPE_EDGE_FALLING) |
| dev_warn(&lp->spi->dev, |
| "Using edge triggered irq's are not recommended!\n"); |
| if (irq_type == IRQ_TYPE_EDGE_FALLING || |
| irq_type == IRQ_TYPE_LEVEL_LOW) |
| irq_pol = IRQ_ACTIVE_LOW; |
| |
| rc = at86rf230_write_subreg(lp, SR_IRQ_POLARITY, irq_pol); |
| if (rc) |
| return rc; |
| |
| rc = at86rf230_write_subreg(lp, SR_RX_SAFE_MODE, 1); |
| if (rc) |
| return rc; |
| |
| rc = at86rf230_write_subreg(lp, SR_IRQ_MASK, IRQ_TRX_END); |
| if (rc) |
| return rc; |
| |
| /* reset values differs in at86rf231 and at86rf233 */ |
| rc = at86rf230_write_subreg(lp, SR_IRQ_MASK_MODE, 0); |
| if (rc) |
| return rc; |
| |
| get_random_bytes(csma_seed, ARRAY_SIZE(csma_seed)); |
| rc = at86rf230_write_subreg(lp, SR_CSMA_SEED_0, csma_seed[0]); |
| if (rc) |
| return rc; |
| rc = at86rf230_write_subreg(lp, SR_CSMA_SEED_1, csma_seed[1]); |
| if (rc) |
| return rc; |
| |
| /* CLKM changes are applied immediately */ |
| rc = at86rf230_write_subreg(lp, SR_CLKM_SHA_SEL, 0x00); |
| if (rc) |
| return rc; |
| |
| /* Turn CLKM Off */ |
| rc = at86rf230_write_subreg(lp, SR_CLKM_CTRL, 0x00); |
| if (rc) |
| return rc; |
| /* Wait the next SLEEP cycle */ |
| usleep_range(lp->data->t_sleep_cycle, |
| lp->data->t_sleep_cycle + 100); |
| |
| /* xtal_trim value is calculated by: |
| * CL = 0.5 * (CX + CTRIM + CPAR) |
| * |
| * whereas: |
| * CL = capacitor of used crystal |
| * CX = connected capacitors at xtal pins |
| * CPAR = in all at86rf2xx datasheets this is a constant value 3 pF, |
| * but this is different on each board setup. You need to fine |
| * tuning this value via CTRIM. |
| * CTRIM = variable capacitor setting. Resolution is 0.3 pF range is |
| * 0 pF upto 4.5 pF. |
| * |
| * Examples: |
| * atben transceiver: |
| * |
| * CL = 8 pF |
| * CX = 12 pF |
| * CPAR = 3 pF (We assume the magic constant from datasheet) |
| * CTRIM = 0.9 pF |
| * |
| * (12+0.9+3)/2 = 7.95 which is nearly at 8 pF |
| * |
| * xtal_trim = 0x3 |
| * |
| * openlabs transceiver: |
| * |
| * CL = 16 pF |
| * CX = 22 pF |
| * CPAR = 3 pF (We assume the magic constant from datasheet) |
| * CTRIM = 4.5 pF |
| * |
| * (22+4.5+3)/2 = 14.75 which is the nearest value to 16 pF |
| * |
| * xtal_trim = 0xf |
| */ |
| rc = at86rf230_write_subreg(lp, SR_XTAL_TRIM, xtal_trim); |
| if (rc) |
| return rc; |
| |
| rc = at86rf230_read_subreg(lp, SR_DVDD_OK, &dvdd); |
| if (rc) |
| return rc; |
| if (!dvdd) { |
| dev_err(&lp->spi->dev, "DVDD error\n"); |
| return -EINVAL; |
| } |
| |
| /* Force setting slotted operation bit to 0. Sometimes the atben |
| * sets this bit and I don't know why. We set this always force |
| * to zero while probing. |
| */ |
| return at86rf230_write_subreg(lp, SR_SLOTTED_OPERATION, 0); |
| } |
| |
| static int |
| at86rf230_get_pdata(struct spi_device *spi, int *rstn, int *slp_tr, |
| u8 *xtal_trim) |
| { |
| struct at86rf230_platform_data *pdata = spi->dev.platform_data; |
| int ret; |
| |
| if (!IS_ENABLED(CONFIG_OF) || !spi->dev.of_node) { |
| if (!pdata) |
| return -ENOENT; |
| |
| *rstn = pdata->rstn; |
| *slp_tr = pdata->slp_tr; |
| *xtal_trim = pdata->xtal_trim; |
| return 0; |
| } |
| |
| *rstn = of_get_named_gpio(spi->dev.of_node, "reset-gpio", 0); |
| *slp_tr = of_get_named_gpio(spi->dev.of_node, "sleep-gpio", 0); |
| ret = of_property_read_u8(spi->dev.of_node, "xtal-trim", xtal_trim); |
| if (ret < 0 && ret != -EINVAL) |
| return ret; |
| |
| return 0; |
| } |
| |
| static int |
| at86rf230_detect_device(struct at86rf230_local *lp) |
| { |
| unsigned int part, version, val; |
| u16 man_id = 0; |
| const char *chip; |
| int rc; |
| |
| rc = __at86rf230_read(lp, RG_MAN_ID_0, &val); |
| if (rc) |
| return rc; |
| man_id |= val; |
| |
| rc = __at86rf230_read(lp, RG_MAN_ID_1, &val); |
| if (rc) |
| return rc; |
| man_id |= (val << 8); |
| |
| rc = __at86rf230_read(lp, RG_PART_NUM, &part); |
| if (rc) |
| return rc; |
| |
| rc = __at86rf230_read(lp, RG_VERSION_NUM, &version); |
| if (rc) |
| return rc; |
| |
| if (man_id != 0x001f) { |
| dev_err(&lp->spi->dev, "Non-Atmel dev found (MAN_ID %02x %02x)\n", |
| man_id >> 8, man_id & 0xFF); |
| return -EINVAL; |
| } |
| |
| lp->hw->flags = IEEE802154_HW_TX_OMIT_CKSUM | |
| IEEE802154_HW_CSMA_PARAMS | |
| IEEE802154_HW_FRAME_RETRIES | IEEE802154_HW_AFILT | |
| IEEE802154_HW_PROMISCUOUS; |
| |
| lp->hw->phy->flags = WPAN_PHY_FLAG_TXPOWER | |
| WPAN_PHY_FLAG_CCA_ED_LEVEL | |
| WPAN_PHY_FLAG_CCA_MODE; |
| |
| lp->hw->phy->supported.cca_modes = BIT(NL802154_CCA_ENERGY) | |
| BIT(NL802154_CCA_CARRIER) | BIT(NL802154_CCA_ENERGY_CARRIER); |
| lp->hw->phy->supported.cca_opts = BIT(NL802154_CCA_OPT_ENERGY_CARRIER_AND) | |
| BIT(NL802154_CCA_OPT_ENERGY_CARRIER_OR); |
| |
| lp->hw->phy->supported.cca_ed_levels = at86rf23x_ed_levels; |
| lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf23x_ed_levels); |
| |
| lp->hw->phy->cca.mode = NL802154_CCA_ENERGY; |
| |
| switch (part) { |
| case 2: |
| chip = "at86rf230"; |
| rc = -ENOTSUPP; |
| goto not_supp; |
| case 3: |
| chip = "at86rf231"; |
| lp->data = &at86rf231_data; |
| lp->hw->phy->supported.channels[0] = 0x7FFF800; |
| lp->hw->phy->current_channel = 11; |
| lp->hw->phy->symbol_duration = 16; |
| lp->hw->phy->supported.tx_powers = at86rf231_powers; |
| lp->hw->phy->supported.tx_powers_size = ARRAY_SIZE(at86rf231_powers); |
| break; |
| case 7: |
| chip = "at86rf212"; |
| lp->data = &at86rf212_data; |
| lp->hw->flags |= IEEE802154_HW_LBT; |
| lp->hw->phy->supported.channels[0] = 0x00007FF; |
| lp->hw->phy->supported.channels[2] = 0x00007FF; |
| lp->hw->phy->current_channel = 5; |
| lp->hw->phy->symbol_duration = 25; |
| lp->hw->phy->supported.lbt = NL802154_SUPPORTED_BOOL_BOTH; |
| lp->hw->phy->supported.tx_powers = at86rf212_powers; |
| lp->hw->phy->supported.tx_powers_size = ARRAY_SIZE(at86rf212_powers); |
| lp->hw->phy->supported.cca_ed_levels = at86rf212_ed_levels_100; |
| lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf212_ed_levels_100); |
| break; |
| case 11: |
| chip = "at86rf233"; |
| lp->data = &at86rf233_data; |
| lp->hw->phy->supported.channels[0] = 0x7FFF800; |
| lp->hw->phy->current_channel = 13; |
| lp->hw->phy->symbol_duration = 16; |
| lp->hw->phy->supported.tx_powers = at86rf233_powers; |
| lp->hw->phy->supported.tx_powers_size = ARRAY_SIZE(at86rf233_powers); |
| break; |
| default: |
| chip = "unknown"; |
| rc = -ENOTSUPP; |
| goto not_supp; |
| } |
| |
| lp->hw->phy->cca_ed_level = lp->hw->phy->supported.cca_ed_levels[7]; |
| lp->hw->phy->transmit_power = lp->hw->phy->supported.tx_powers[0]; |
| |
| not_supp: |
| dev_info(&lp->spi->dev, "Detected %s chip version %d\n", chip, version); |
| |
| return rc; |
| } |
| |
| static void |
| at86rf230_setup_spi_messages(struct at86rf230_local *lp) |
| { |
| lp->state.lp = lp; |
| lp->state.irq = lp->spi->irq; |
| spi_message_init(&lp->state.msg); |
| lp->state.msg.context = &lp->state; |
| lp->state.trx.len = 2; |
| lp->state.trx.tx_buf = lp->state.buf; |
| lp->state.trx.rx_buf = lp->state.buf; |
| spi_message_add_tail(&lp->state.trx, &lp->state.msg); |
| hrtimer_init(&lp->state.timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
| lp->state.timer.function = at86rf230_async_state_timer; |
| |
| lp->irq.lp = lp; |
| lp->irq.irq = lp->spi->irq; |
| spi_message_init(&lp->irq.msg); |
| lp->irq.msg.context = &lp->irq; |
| lp->irq.trx.len = 2; |
| lp->irq.trx.tx_buf = lp->irq.buf; |
| lp->irq.trx.rx_buf = lp->irq.buf; |
| spi_message_add_tail(&lp->irq.trx, &lp->irq.msg); |
| hrtimer_init(&lp->irq.timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
| lp->irq.timer.function = at86rf230_async_state_timer; |
| |
| lp->tx.lp = lp; |
| lp->tx.irq = lp->spi->irq; |
| spi_message_init(&lp->tx.msg); |
| lp->tx.msg.context = &lp->tx; |
| lp->tx.trx.len = 2; |
| lp->tx.trx.tx_buf = lp->tx.buf; |
| lp->tx.trx.rx_buf = lp->tx.buf; |
| spi_message_add_tail(&lp->tx.trx, &lp->tx.msg); |
| hrtimer_init(&lp->tx.timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
| lp->tx.timer.function = at86rf230_async_state_timer; |
| } |
| |
| static int at86rf230_probe(struct spi_device *spi) |
| { |
| struct ieee802154_hw *hw; |
| struct at86rf230_local *lp; |
| unsigned int status; |
| int rc, irq_type, rstn, slp_tr; |
| u8 xtal_trim = 0; |
| |
| if (!spi->irq) { |
| dev_err(&spi->dev, "no IRQ specified\n"); |
| return -EINVAL; |
| } |
| |
| rc = at86rf230_get_pdata(spi, &rstn, &slp_tr, &xtal_trim); |
| if (rc < 0) { |
| dev_err(&spi->dev, "failed to parse platform_data: %d\n", rc); |
| return rc; |
| } |
| |
| if (gpio_is_valid(rstn)) { |
| rc = devm_gpio_request_one(&spi->dev, rstn, |
| GPIOF_OUT_INIT_HIGH, "rstn"); |
| if (rc) |
| return rc; |
| } |
| |
| if (gpio_is_valid(slp_tr)) { |
| rc = devm_gpio_request_one(&spi->dev, slp_tr, |
| GPIOF_OUT_INIT_LOW, "slp_tr"); |
| if (rc) |
| return rc; |
| } |
| |
| /* Reset */ |
| if (gpio_is_valid(rstn)) { |
| udelay(1); |
| gpio_set_value(rstn, 0); |
| udelay(1); |
| gpio_set_value(rstn, 1); |
| usleep_range(120, 240); |
| } |
| |
| hw = ieee802154_alloc_hw(sizeof(*lp), &at86rf230_ops); |
| if (!hw) |
| return -ENOMEM; |
| |
| lp = hw->priv; |
| lp->hw = hw; |
| lp->spi = spi; |
| lp->slp_tr = slp_tr; |
| hw->parent = &spi->dev; |
| ieee802154_random_extended_addr(&hw->phy->perm_extended_addr); |
| |
| lp->regmap = devm_regmap_init_spi(spi, &at86rf230_regmap_spi_config); |
| if (IS_ERR(lp->regmap)) { |
| rc = PTR_ERR(lp->regmap); |
| dev_err(&spi->dev, "Failed to allocate register map: %d\n", |
| rc); |
| goto free_dev; |
| } |
| |
| at86rf230_setup_spi_messages(lp); |
| |
| rc = at86rf230_detect_device(lp); |
| if (rc < 0) |
| goto free_dev; |
| |
| init_completion(&lp->state_complete); |
| |
| spi_set_drvdata(spi, lp); |
| |
| rc = at86rf230_hw_init(lp, xtal_trim); |
| if (rc) |
| goto free_dev; |
| |
| /* Read irq status register to reset irq line */ |
| rc = at86rf230_read_subreg(lp, RG_IRQ_STATUS, 0xff, 0, &status); |
| if (rc) |
| goto free_dev; |
| |
| irq_type = irq_get_trigger_type(spi->irq); |
| if (!irq_type) |
| irq_type = IRQF_TRIGGER_HIGH; |
| |
| rc = devm_request_irq(&spi->dev, spi->irq, at86rf230_isr, |
| IRQF_SHARED | irq_type, dev_name(&spi->dev), lp); |
| if (rc) |
| goto free_dev; |
| |
| /* disable_irq by default and wait for starting hardware */ |
| disable_irq(spi->irq); |
| |
| /* going into sleep by default */ |
| at86rf230_sleep(lp); |
| |
| rc = ieee802154_register_hw(lp->hw); |
| if (rc) |
| goto free_dev; |
| |
| return rc; |
| |
| free_dev: |
| ieee802154_free_hw(lp->hw); |
| |
| return rc; |
| } |
| |
| static int at86rf230_remove(struct spi_device *spi) |
| { |
| struct at86rf230_local *lp = spi_get_drvdata(spi); |
| |
| /* mask all at86rf230 irq's */ |
| at86rf230_write_subreg(lp, SR_IRQ_MASK, 0); |
| ieee802154_unregister_hw(lp->hw); |
| ieee802154_free_hw(lp->hw); |
| dev_dbg(&spi->dev, "unregistered at86rf230\n"); |
| |
| return 0; |
| } |
| |
| static const struct of_device_id at86rf230_of_match[] = { |
| { .compatible = "atmel,at86rf230", }, |
| { .compatible = "atmel,at86rf231", }, |
| { .compatible = "atmel,at86rf233", }, |
| { .compatible = "atmel,at86rf212", }, |
| { }, |
| }; |
| MODULE_DEVICE_TABLE(of, at86rf230_of_match); |
| |
| static const struct spi_device_id at86rf230_device_id[] = { |
| { .name = "at86rf230", }, |
| { .name = "at86rf231", }, |
| { .name = "at86rf233", }, |
| { .name = "at86rf212", }, |
| { }, |
| }; |
| MODULE_DEVICE_TABLE(spi, at86rf230_device_id); |
| |
| static struct spi_driver at86rf230_driver = { |
| .id_table = at86rf230_device_id, |
| .driver = { |
| .of_match_table = of_match_ptr(at86rf230_of_match), |
| .name = "at86rf230", |
| .owner = THIS_MODULE, |
| }, |
| .probe = at86rf230_probe, |
| .remove = at86rf230_remove, |
| }; |
| |
| module_spi_driver(at86rf230_driver); |
| |
| MODULE_DESCRIPTION("AT86RF230 Transceiver Driver"); |
| MODULE_LICENSE("GPL v2"); |