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ar71xx: add a helper function for external LNA GPIO setup

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The built-in wireless MAC of the AR934x SoC can handle
external LNAs and the control signal of the LNAs can be
routed to any GPIO line. Add a helper function which
can be used to configure the GPIO lines.

The helper function will be used for AR934x boards
which are using externel LNAs to improve sensitivity.

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

SVN-Revision: 39215
This commit is contained in:
Gabor Juhos 2014-01-10 09:37:57 +00:00
parent 32aef686f7
commit 182e8ef949
2 changed files with 79 additions and 1 deletions
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4
target/linux/ar71xx/patches-3.10/601-MIPS-ath79-add-more-register-defines.patch
View File

@ -207,7 +207,7 @@
#define AR934X_GPIO_REG_FUNC 0x6c
#define AR71XX_GPIO_COUNT 16
@@ -561,4 +664,146 @@
@@ -561,4 +664,148 @@
#define AR934X_SRIF_DPLL2_OUTDIV_SHIFT 13
#define AR934X_SRIF_DPLL2_OUTDIV_MASK 0x7
@ -284,6 +284,8 @@
+#define AR934X_GPIO_OUT_LED_LINK2 43
+#define AR934X_GPIO_OUT_LED_LINK3 44
+#define AR934X_GPIO_OUT_LED_LINK4 45
+#define AR934X_GPIO_OUT_EXT_LNA0 46
+#define AR934X_GPIO_OUT_EXT_LNA1 47
+
+/*
+ * MII_CTRL block

76
target/linux/ar71xx/patches-3.10/613-MIPS-ath79-add-ath79_wmac_setup_ext_lna_gpio-helper.patch Normal file
View File

@ -0,0 +1,76 @@
--- a/arch/mips/ath79/dev-wmac.c
+++ b/arch/mips/ath79/dev-wmac.c
@@ -18,9 +18,11 @@
#include <linux/etherdevice.h>
#include <linux/platform_device.h>
#include <linux/ath9k_platform.h>
+#include <linux/gpio.h>
#include <asm/mach-ath79/ath79.h>
#include <asm/mach-ath79/ar71xx_regs.h>
+#include "common.h"
#include "dev-wmac.h"
static u8 ath79_wmac_mac[ETH_ALEN];
@@ -311,6 +313,51 @@ void __init ath79_wmac_set_tx_gain_buffa
ath79_wmac_data.tx_gain_buffalo = true;
}
+static int ath79_request_ext_lna_gpio(unsigned chain, int gpio)
+{
+ char buf[32];
+ char *label;
+ int err;
+
+ scnprintf(buf, sizeof(buf), "external LNA%u", chain);
+ label = kstrdup(buf, GFP_KERNEL);
+
+ err = gpio_request_one(gpio, GPIOF_DIR_OUT | GPIOF_INIT_LOW, label);
+ if (err) {
+ pr_err("unable to request GPIO%d for external LNA%u\n",
+ gpio, chain);
+ kfree(label);
+ }
+
+ return err;
+}
+
+static void ar934x_set_ext_lna_gpio(unsigned chain, int gpio)
+{
+ unsigned int sel;
+ int err;
+
+ if (WARN_ON(chain > 1))
+ return;
+
+ err = ath79_request_ext_lna_gpio(chain, gpio);
+ if (err)
+ return;
+
+ if (chain == 0)
+ sel = AR934X_GPIO_OUT_EXT_LNA0;
+ else
+ sel = AR934X_GPIO_OUT_EXT_LNA1;
+
+ ath79_gpio_output_select(gpio, sel);
+}
+
+void __init ath79_wmac_set_ext_lna_gpio(unsigned chain, int gpio)
+{
+ if (soc_is_ar934x())
+ ar934x_set_ext_lna_gpio(chain, gpio);
+}
+
void __init ath79_register_wmac(u8 *cal_data, u8 *mac_addr)
{
if (soc_is_ar913x())
--- a/arch/mips/ath79/dev-wmac.h
+++ b/arch/mips/ath79/dev-wmac.h
@@ -17,6 +17,7 @@ void ath79_register_wmac_simple(void);
void ath79_wmac_disable_2ghz(void);
void ath79_wmac_disable_5ghz(void);
void ath79_wmac_set_tx_gain_buffalo(void);
+void ath79_wmac_set_ext_lna_gpio(unsigned chain, int gpio);
bool ar93xx_wmac_read_mac_address(u8 *dest);