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185 lines
4.7 KiB
Diff
185 lines
4.7 KiB
Diff
From ee4581f2f024c601a5e247ec6acab3e7df538f88 Mon Sep 17 00:00:00 2001
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From: Gabor Juhos <juhosg@openwrt.org>
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Date: Sun, 9 Dec 2012 17:31:54 +0100
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Subject: [PATCH 4/4] ath9k: allow to load EEPROM content via firmware API
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The calibration data for devices w/o a separate
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EEPROM chip can be specified via the 'eeprom_data'
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field of 'ath9k_platform_data'. The 'eeprom_data'
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is usually filled from board specific setup
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functions. It is easy if the EEPROM data is mapped
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to the memory, but it can be complicated if it is
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stored elsewhere.
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The patch adds support for loading of the EEPROM
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data via the firmware API to avoid this limitation.
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Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
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---
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drivers/net/wireless/ath/ath9k/eeprom.c | 19 +++++++++-
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drivers/net/wireless/ath/ath9k/hw.h | 3 ++
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drivers/net/wireless/ath/ath9k/init.c | 60 ++++++++++++++++++++++++++++++-
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include/linux/ath9k_platform.h | 2 ++
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4 files changed, 82 insertions(+), 2 deletions(-)
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--- a/drivers/net/wireless/ath/ath9k/eeprom.c
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+++ b/drivers/net/wireless/ath/ath9k/eeprom.c
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@@ -113,12 +113,29 @@ void ath9k_hw_usb_gen_fill_eeprom(struct
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}
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}
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+static bool ath9k_hw_nvram_read_blob(struct ath_hw *ah, u32 off,
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+ u16 *data)
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+{
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+ u16 *blob_data;
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+
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+ if (off * sizeof(u16) > ah->eeprom_blob->size)
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+ return false;
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+
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+ blob_data = (u16 *)ah->eeprom_blob->data;
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+ *data = blob_data[off];
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+ return true;
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+}
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+
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bool ath9k_hw_nvram_read(struct ath_hw *ah, u32 off, u16 *data)
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{
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struct ath_common *common = ath9k_hw_common(ah);
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bool ret;
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- ret = common->bus_ops->eeprom_read(common, off, data);
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+ if (ah->eeprom_blob)
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+ ret = ath9k_hw_nvram_read_blob(ah, off, data);
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+ else
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+ ret = common->bus_ops->eeprom_read(common, off, data);
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+
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if (!ret)
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ath_dbg(common, EEPROM,
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"unable to read eeprom region at offset %u\n", off);
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--- a/drivers/net/wireless/ath/ath9k/hw.h
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+++ b/drivers/net/wireless/ath/ath9k/hw.h
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@@ -20,6 +20,7 @@
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#include <linux/if_ether.h>
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#include <linux/delay.h>
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#include <linux/io.h>
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+#include <linux/firmware.h>
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#include "mac.h"
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#include "ani.h"
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@@ -920,6 +921,8 @@ struct ath_hw {
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bool is_clk_25mhz;
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int (*get_mac_revision)(void);
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int (*external_reset)(void);
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+
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+ const struct firmware *eeprom_blob;
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};
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struct ath_bus_ops {
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--- a/drivers/net/wireless/ath/ath9k/init.c
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+++ b/drivers/net/wireless/ath/ath9k/init.c
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@@ -25,6 +25,11 @@
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#include "ath9k.h"
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+struct ath9k_eeprom_ctx {
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+ struct completion complete;
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+ struct ath_hw *ah;
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+};
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+
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static char *dev_info = "ath9k";
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MODULE_AUTHOR("Atheros Communications");
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@@ -508,6 +513,51 @@ static void ath9k_init_misc(struct ath_s
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sc->ant_comb.count = ATH_ANT_DIV_COMB_INIT_COUNT;
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}
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+static void ath9k_eeprom_request_cb(const struct firmware *eeprom_blob,
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+ void *ctx)
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+{
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+ struct ath9k_eeprom_ctx *ec = ctx;
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+
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+ if (eeprom_blob)
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+ ec->ah->eeprom_blob = eeprom_blob;
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+
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+ complete(&ec->complete);
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+}
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+
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+static int ath9k_eeprom_request(struct ath_softc *sc, const char *name)
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+{
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+ struct ath9k_eeprom_ctx ec;
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+ struct ath_hw *ah = ah = sc->sc_ah;
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+ int err;
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+
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+ /* try to load the EEPROM content asynchronously */
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+ init_completion(&ec.complete);
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+ ec.ah = sc->sc_ah;
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+
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+ err = request_firmware_nowait(THIS_MODULE, 1, name, sc->dev, GFP_KERNEL,
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+ &ec, ath9k_eeprom_request_cb);
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+ if (err < 0) {
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+ ath_err(ath9k_hw_common(ah),
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+ "EEPROM request failed\n");
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+ return err;
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+ }
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+
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+ wait_for_completion(&ec.complete);
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+
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+ if (!ah->eeprom_blob) {
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+ ath_err(ath9k_hw_common(ah),
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+ "Unable to load EEPROM file %s\n", name);
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+ return -EINVAL;
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+ }
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+
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+ return 0;
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+}
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+
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+static void ath9k_eeprom_release(struct ath_softc *sc)
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+{
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+ release_firmware(sc->sc_ah->eeprom_blob);
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+}
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+
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static int ath9k_init_softc(u16 devid, struct ath_softc *sc,
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const struct ath_bus_ops *bus_ops)
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{
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@@ -585,6 +635,12 @@ static int ath9k_init_softc(u16 devid, s
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ath_read_cachesize(common, &csz);
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common->cachelsz = csz << 2; /* convert to bytes */
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+ if (pdata && pdata->eeprom_name) {
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+ ret = ath9k_eeprom_request(sc, pdata->eeprom_name);
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+ if (ret)
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+ goto err_eeprom;
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+ }
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+
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/* Initializes the hardware for all supported chipsets */
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ret = ath9k_hw_init(ah);
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if (ret)
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@@ -621,7 +677,8 @@ err_btcoex:
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err_queues:
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ath9k_hw_deinit(ah);
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err_hw:
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-
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+ ath9k_eeprom_release(sc);
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+err_eeprom:
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kfree(ah);
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sc->sc_ah = NULL;
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@@ -884,6 +941,7 @@ static void ath9k_deinit_softc(struct at
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if (sc->dfs_detector != NULL)
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sc->dfs_detector->exit(sc->dfs_detector);
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+ ath9k_eeprom_release(sc);
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kfree(sc->sc_ah);
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sc->sc_ah = NULL;
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}
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--- a/include/linux/ath9k_platform.h
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+++ b/include/linux/ath9k_platform.h
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@@ -22,6 +22,8 @@
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#define ATH9K_PLAT_EEP_MAX_WORDS 2048
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struct ath9k_platform_data {
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+ const char *eeprom_name;
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+
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u16 eeprom_data[ATH9K_PLAT_EEP_MAX_WORDS];
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u8 *macaddr;
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