ieee802154: enable smart transmitter features of RF212
This patch does multiple things:
* add .set_csma_params and .set_frame_retries for the RF212 radio.
This should work fine with RF230, but since I have no RF230 radios to
test with, RF230 does not implement these right now
* enable TX_ARET for frame retransmission limits greater than -1
Since RF230 has no operations to change CSMA parameters or frame retry
limits, RF230 will not be able to enter TX_ARET with this patch.
Signed-off-by: Phoebe Buckheister <phoebe.buckheister@itwm.fraunhofer.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/ieee802154/at86rf230.c b/drivers/net/ieee802154/at86rf230.c
index 345b2ee..34bf011 100644
--- a/drivers/net/ieee802154/at86rf230.c
+++ b/drivers/net/ieee802154/at86rf230.c
@@ -52,6 +52,7 @@
spinlock_t lock;
bool irq_busy;
bool is_tx;
+ bool tx_aret;
int rssi_base_val;
};
@@ -549,7 +550,9 @@
} while (val == STATE_TRANSITION_IN_PROGRESS);
- if (val == desired_status)
+ if (val == desired_status ||
+ (desired_status == STATE_RX_ON && val == STATE_BUSY_RX) ||
+ (desired_status == STATE_RX_AACK_ON && val == STATE_BUSY_RX_AACK))
return 0;
pr_err("unexpected state change: %d, asked for %d\n", val, state);
@@ -570,6 +573,10 @@
if (rc)
return rc;
+ rc = at86rf230_state(dev, STATE_FORCE_TX_ON);
+ if (rc)
+ return rc;
+
return at86rf230_state(dev, STATE_RX_AACK_ON);
}
@@ -669,6 +676,12 @@
if (rc)
goto err_rx;
+ if (lp->tx_aret) {
+ rc = at86rf230_write_subreg(lp, SR_TRX_CMD, STATE_TX_ARET_ON);
+ if (rc)
+ goto err_rx;
+ }
+
rc = at86rf230_write_subreg(lp, SR_TRX_CMD, STATE_BUSY_TX);
if (rc)
goto err_rx;
@@ -823,6 +836,44 @@
return at86rf230_write_subreg(lp, SR_CCA_ED_THRES, desens_steps);
}
+static int
+at86rf212_set_csma_params(struct ieee802154_dev *dev, u8 min_be, u8 max_be,
+ u8 retries)
+{
+ struct at86rf230_local *lp = dev->priv;
+ int rc;
+
+ if (min_be > max_be || max_be > 8 || retries > 5)
+ return -EINVAL;
+
+ 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, max_be);
+}
+
+static int
+at86rf212_set_frame_retries(struct ieee802154_dev *dev, s8 retries)
+{
+ struct at86rf230_local *lp = dev->priv;
+ int rc = 0;
+
+ if (retries < -1 || retries > 15)
+ return -EINVAL;
+
+ lp->tx_aret = retries >= 0;
+
+ if (retries >= 0)
+ rc = at86rf230_write_subreg(lp, SR_MAX_FRAME_RETRIES, retries);
+
+ return rc;
+}
+
static struct ieee802154_ops at86rf230_ops = {
.owner = THIS_MODULE,
.xmit = at86rf230_xmit,
@@ -845,6 +896,8 @@
.set_lbt = at86rf212_set_lbt,
.set_cca_mode = at86rf212_set_cca_mode,
.set_cca_ed_level = at86rf212_set_cca_ed_level,
+ .set_csma_params = at86rf212_set_csma_params,
+ .set_frame_retries = at86rf212_set_frame_retries,
};
static void at86rf230_irqwork(struct work_struct *work)
@@ -921,6 +974,7 @@
struct at86rf230_platform_data *pdata = lp->spi->dev.platform_data;
int rc, irq_pol;
u8 status;
+ u8 csma_seed[2];
rc = at86rf230_read_subreg(lp, SR_TRX_STATUS, &status);
if (rc)
@@ -944,6 +998,14 @@
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)