ar71xx: add a helper function for external LNA GPIO setup

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>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@39215 3c298f89-4303-0410-b956-a3cf2f4a3e73

2 files changed, 79 insertions, 1 deletions

diff --git a/target/linux/ar71xx/patches-3.10/601-MIPS-ath79-add-more-register-defines.patch b/target/linux/ar71xx/patches-3.10/601-MIPS-ath79-add-more-register-defines.patch
index 4812a624f2..81a997b85e 100644
--- a/target/linux/ar71xx/patches-3.10/601-MIPS-ath79-add-more-register-defines.patch
+++ b/target/linux/ar71xx/patches-3.10/601-MIPS-ath79-add-more-register-defines.patch
@@ -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
diff --git a/target/linux/ar71xx/patches-3.10/613-MIPS-ath79-add-ath79_wmac_setup_ext_lna_gpio-helper.patch b/target/linux/ar71xx/patches-3.10/613-MIPS-ath79-add-ath79_wmac_setup_ext_lna_gpio-helper.patch
new file mode 100644
index 0000000000..83de7b120a
--- /dev/null
+++ b/target/linux/ar71xx/patches-3.10/613-MIPS-ath79-add-ath79_wmac_setup_ext_lna_gpio-helper.patch
@@ -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);
+