[PATCH v4 2/2] ath10k: read calibration data from Device Tree

Kalle Valo
2014-11-27T12:09:22Z

From: Toshi Kikuchi <toshik@chromium.org>

This patch adds support for reading calibration data from Device Tree.
It looks for the calibration data in Device Tree if it can't find it
in a file. If there's no node in Device Tree, ath10k will try to find the
calibration data from OTP.

The node for the calibration data should be defined like this:

pci {
pcie@0 {
reg = <0 0 0 0 0>;
#interrupt-cells = <1>;
#size-cells = <2>;
#address-cells = <3>;
device_type = "pci";

ath10k@0,0 {
reg = <0 0 0 0 0>;
device_type = "pci";
qcom,ath10k-calibration-data = [ 01 02 03 ... ];
};
};
};

Signed-off-by: Toshi Kikuchi <toshik@chromium.org>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
---
drivers/net/wireless/ath/ath10k/core.c | 70 ++++++++++++++++++++++++++++++++
drivers/net/wireless/ath/ath10k/core.h | 3 +
2 files changed, 72 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/ath/ath10k/core.c b/drivers/net/wireless/ath/ath10k/core.c
index 7762061a1944..6165f2735b35 100644
--- a/drivers/net/wireless/ath/ath10k/core.c
+++ b/drivers/net/wireless/ath/ath10k/core.c
@@ -17,6 +17,7 @@

#include <linux/module.h>
#include <linux/firmware.h>
+#include <linux/of.h>

#include "core.h"
#include "mac.h"
@@ -249,6 +250,63 @@ static int ath10k_download_cal_file(struct ath10k *ar)
return 0;
}

+static int ath10k_download_cal_dt(struct ath10k *ar)
+{
+ struct device_node *node;
+ int data_len;
+ void *data;
+ int ret;
+
+ node = ar->dev->of_node;
+ if (!node)
+ /* Device Tree is optional, don't print any warnings if
+ * there's no node for ath10k.
+ */
+ return -ENOENT;
+
+ if (!of_get_property(node, "qcom,ath10k-calibration-data",
+ &data_len)) {
+ /* The calibration data node is optional */
+ return -ENOENT;
+ }
+
+ if (data_len != QCA988X_CAL_DATA_LEN) {
+ ath10k_warn(ar, "invalid calibration data length in DT: %d\n",
+ data_len);
+ ret = -EMSGSIZE;
+ goto out;
+ }
+
+ data = kmalloc(data_len, GFP_KERNEL);
+ if (!data) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ ret = of_property_read_u8_array(node, "qcom,ath10k-calibration-data",
+ data, data_len);
+ if (ret) {
+ ath10k_warn(ar, "failed to read calibration data from DT: %d\n",
+ ret);
+ goto out_free;
+ }
+
+ ret = ath10k_download_board_data(ar, data, data_len);
+ if (ret) {
+ ath10k_warn(ar, "failed to download calibration data from Device Tree: %d\n",
+ ret);
+ goto out_free;
+ }
+
+ ret = 0;
+
+out_free:
+ kfree(data);
+
+out:
+ return ret;
+}
+
static int ath10k_download_and_run_otp(struct ath10k *ar)
{
u32 result, address = ar->hw_params.patch_load_addr;
@@ -662,7 +720,17 @@ static int ath10k_download_cal_data(struct ath10k *ar)
}

ath10k_dbg(ar, ATH10K_DBG_BOOT,
- "boot did not find a calibration file, try OTP next: %d\n",
+ "boot did not find a calibration file, try DT next: %d\n",
+ ret);
+
+ ret = ath10k_download_cal_dt(ar);
+ if (ret == 0) {
+ ar->cal_mode = ATH10K_CAL_MODE_DT;
+ goto done;
+ }
+
+ ath10k_dbg(ar, ATH10K_DBG_BOOT,
+ "boot did not find DT entry, try OTP next: %d\n",
ret);

ret = ath10k_download_and_run_otp(ar);
diff --git a/drivers/net/wireless/ath/ath10k/core.h b/drivers/net/wireless/ath/ath10k/core.h
index 4a294987736c..2dd1bb05a3fc 100644
--- a/drivers/net/wireless/ath/ath10k/core.h
+++ b/drivers/net/wireless/ath/ath10k/core.h
@@ -400,6 +400,7 @@ enum ath10k_dev_flags {
enum ath10k_cal_mode {
ATH10K_CAL_MODE_FILE,
ATH10K_CAL_MODE_OTP,
+ ATH10K_CAL_MODE_DT,
};

static inline const char *ath10k_cal_mode_str(enum ath10k_cal_mode mode)
@@ -409,6 +410,8 @@ static inline const char *ath10k_cal_mode_str(enum ath10k_cal_mode mode)
return "file";
case ATH10K_CAL_MODE_OTP:
return "otp";
+ case ATH10K_CAL_MODE_DT:
+ return "dt";
}

return "unknown";