ar71xx: Add kernel 4.9 support

This add support for kernel 4.9 to the ar71xx target.
It was compile tested with the generic, NAND and mikrotik subtarget.
Multiple members of the community tested it on their boards and did not
report any major problem so far.

Especially the NAND part received some changes to adapt to the new
kernel APIs. The serial driver hack used for the Arduino Yun was not
ported because the kernel changed there a lot.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

1 files changed, 106 insertions, 0 deletions

diff --git a/target/linux/ar71xx/patches-4.9/630-MIPS-ath79-fix-chained-irq-disable.patch b/target/linux/ar71xx/patches-4.9/630-MIPS-ath79-fix-chained-irq-disable.patch
new file mode 100644
index 0000000000..2b92b88d03
--- /dev/null
+++ b/target/linux/ar71xx/patches-4.9/630-MIPS-ath79-fix-chained-irq-disable.patch
@@ -0,0 +1,106 @@
+--- a/arch/mips/ath79/irq.c
++++ b/arch/mips/ath79/irq.c
+@@ -27,6 +27,9 @@
+ #include "machtypes.h"
+ 
+ 
++static struct irq_chip ip2_chip;
++static struct irq_chip ip3_chip;
++
+ static void ar934x_ip2_irq_dispatch(struct irq_desc *desc)
+ {
+ 	u32 status;
+@@ -50,8 +53,7 @@ static void ar934x_ip2_irq_init(void)
+ 
+ 	for (i = ATH79_IP2_IRQ_BASE;
+ 	     i < ATH79_IP2_IRQ_BASE + ATH79_IP2_IRQ_COUNT; i++)
+-		irq_set_chip_and_handler(i, &dummy_irq_chip,
+-					 handle_level_irq);
++		irq_set_chip_and_handler(i, &ip2_chip, handle_level_irq);
+ 
+ 	irq_set_chained_handler(ATH79_CPU_IRQ(2), ar934x_ip2_irq_dispatch);
+ }
+@@ -79,7 +81,7 @@ static void qca953x_irq_init(void)
+ 
+ 	for (i = ATH79_IP2_IRQ_BASE;
+ 	     i < ATH79_IP2_IRQ_BASE + ATH79_IP2_IRQ_COUNT; i++)
+-		irq_set_chip_and_handler(i, &dummy_irq_chip, handle_level_irq);
++		irq_set_chip_and_handler(i, &ip2_chip, handle_level_irq);
+ 
+ 	irq_set_chained_handler(ATH79_CPU_IRQ(2), qca953x_ip2_irq_dispatch);
+ }
+@@ -143,15 +145,13 @@ static void qca955x_irq_init(void)
+ 
+ 	for (i = ATH79_IP2_IRQ_BASE;
+ 	     i < ATH79_IP2_IRQ_BASE + ATH79_IP2_IRQ_COUNT; i++)
+-		irq_set_chip_and_handler(i, &dummy_irq_chip,
+-					 handle_level_irq);
++		irq_set_chip_and_handler(i, &ip2_chip, handle_level_irq);
+ 
+ 	irq_set_chained_handler(ATH79_CPU_IRQ(2), qca955x_ip2_irq_dispatch);
+ 
+ 	for (i = ATH79_IP3_IRQ_BASE;
+ 	     i < ATH79_IP3_IRQ_BASE + ATH79_IP3_IRQ_COUNT; i++)
+-		irq_set_chip_and_handler(i, &dummy_irq_chip,
+-					 handle_level_irq);
++		irq_set_chip_and_handler(i, &ip3_chip, handle_level_irq);
+ 
+ 	irq_set_chained_handler(ATH79_CPU_IRQ(3), qca955x_ip3_irq_dispatch);
+ }
+@@ -222,13 +222,13 @@ static void qca956x_irq_init(void)
+ 
+ 	for (i = ATH79_IP2_IRQ_BASE;
+ 	     i < ATH79_IP2_IRQ_BASE + ATH79_IP2_IRQ_COUNT; i++)
+-		irq_set_chip_and_handler(i, &dummy_irq_chip, handle_level_irq);
++		irq_set_chip_and_handler(i, &ip2_chip, handle_level_irq);
+ 
+ 	irq_set_chained_handler(ATH79_CPU_IRQ(2), qca956x_ip2_irq_dispatch);
+ 
+ 	for (i = ATH79_IP3_IRQ_BASE;
+ 	     i < ATH79_IP3_IRQ_BASE + ATH79_IP3_IRQ_COUNT; i++)
+-		irq_set_chip_and_handler(i, &dummy_irq_chip, handle_level_irq);
++		irq_set_chip_and_handler(i, &ip3_chip, handle_level_irq);
+ 
+ 	irq_set_chained_handler(ATH79_CPU_IRQ(3), qca956x_ip3_irq_dispatch);
+ 
+@@ -237,12 +237,40 @@ static void qca956x_irq_init(void)
+ 	late_time_init = &qca956x_enable_timer_cb;
+ }
+ 
++static void ath79_ip2_disable(struct irq_data *data)
++{
++	disable_irq(ATH79_CPU_IRQ(2));
++}
++
++static void ath79_ip2_enable(struct irq_data *data)
++{
++	enable_irq(ATH79_CPU_IRQ(2));
++}
++
++static void ath79_ip3_disable(struct irq_data *data)
++{
++	disable_irq(ATH79_CPU_IRQ(3));
++}
++
++static void ath79_ip3_enable(struct irq_data *data)
++{
++	enable_irq(ATH79_CPU_IRQ(3));
++}
++
+ void __init arch_init_irq(void)
+ {
+ 	unsigned irq_wb_chan2 = -1;
+ 	unsigned irq_wb_chan3 = -1;
+ 	bool misc_is_ar71xx;
+ 
++	ip2_chip = dummy_irq_chip;
++	ip2_chip.irq_disable = ath79_ip2_disable;
++	ip2_chip.irq_enable = ath79_ip2_enable;
++
++	ip3_chip = dummy_irq_chip;
++	ip3_chip.irq_disable = ath79_ip3_disable;
++	ip3_chip.irq_enable = ath79_ip3_enable;
++
+ 	if (mips_machtype == ATH79_MACH_GENERIC_OF) {
+ 		irqchip_init();
+ 		return;