brcm63xx: add linux 4.19 support

Boot tested on Comtrend AR-5387un:
https://gist.github.com/Noltari/57e5030455da8dc38e61f8c3a5922254

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
[jonas.gorski: make 4.19 an optional testing version; add gcc 8.3 fix]
Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>

1 files changed, 71 insertions, 0 deletions

diff --git a/target/linux/brcm63xx/patches-4.19/348-MIPS-BCM63XX-fix-BCM63268-USB-clock.patch b/target/linux/brcm63xx/patches-4.19/348-MIPS-BCM63XX-fix-BCM63268-USB-clock.patch
new file mode 100644
index 0000000000..cdff8d5a4d
--- /dev/null
+++ b/target/linux/brcm63xx/patches-4.19/348-MIPS-BCM63XX-fix-BCM63268-USB-clock.patch
@@ -0,0 +1,71 @@
+--- a/arch/mips/include/asm/mach-bcm63xx/bcm63xx_regs.h
++++ b/arch/mips/include/asm/mach-bcm63xx/bcm63xx_regs.h
+@@ -587,6 +587,9 @@
+ #define TIMER_CTL_MONOTONIC_MASK	(1 << 30)
+ #define TIMER_CTL_ENABLE_MASK		(1 << 31)
+ 
++/* Clock reset control (63268 only) */
++#define TIMER_CLK_RST_CTL_REG		0x2c
++#define CLK_RST_CTL_USB_REF_CLK_EN	(1 << 18)
+ 
+ /*************************************************************************
+  * _REG relative to RSET_WDT
+@@ -1534,6 +1537,11 @@
+ #define STRAPBUS_63268_FCVO_SHIFT	21
+ #define STRAPBUS_63268_FCVO_MASK	(0xf << STRAPBUS_63268_FCVO_SHIFT)
+ 
++#define MISC_IDDQ_CTRL_6328_REG		0x48
++#define MISC_IDDQ_CTRL_63268_REG	0x4c
++
++#define IDDQ_CTRL_63268_USBH		(1 << 4)
++
+ #define MISC_STRAPBUS_6328_REG		0x240
+ #define STRAPBUS_6328_FCVO_SHIFT	7
+ #define STRAPBUS_6328_FCVO_MASK		(0x1f << STRAPBUS_6328_FCVO_SHIFT)
+--- a/arch/mips/bcm63xx/clk.c
++++ b/arch/mips/bcm63xx/clk.c
+@@ -64,6 +64,26 @@ static void bcm_ub_hwclock_set(u32 mask,
+ 	bcm_perf_writel(reg, PERF_UB_CKCTL_REG);
+ }
+ 
++static void bcm_misc_iddq_set(u32 mask, int enable)
++{
++	u32 offset;
++	u32 reg;
++
++	if (BCMCPU_IS_6328() || BCMCPU_IS_6362())
++		offset = MISC_IDDQ_CTRL_6328_REG;
++	else if (BCMCPU_IS_63268())
++		offset = MISC_IDDQ_CTRL_63268_REG;
++	else
++		return;
++
++	reg = bcm_misc_readl(offset);
++	if (enable)
++		reg &= ~mask;
++	else
++		reg |= mask;
++	bcm_misc_writel(reg, offset);
++}
++
+ /*
+  * Ethernet MAC "misc" clock: dma clocks and main clock on 6348
+  */
+@@ -236,7 +256,17 @@ static void usbh_set(struct clk *clk, in
+ 	} else if (BCMCPU_IS_6368()) {
+ 		bcm_hwclock_set(CKCTL_6368_USBH_EN, enable);
+ 	} else if (BCMCPU_IS_63268()) {
++		u32 reg;
++
+ 		bcm_hwclock_set(CKCTL_63268_USBH_EN, enable);
++		bcm_misc_iddq_set(IDDQ_CTRL_63268_USBH, enable);
++		bcm63xx_core_set_reset(BCM63XX_RESET_USBH, !enable);
++		reg = bcm_timer_readl(TIMER_CLK_RST_CTL_REG);
++		if (enable)
++			reg |= CLK_RST_CTL_USB_REF_CLK_EN;
++		else
++			reg &= ~CLK_RST_CTL_USB_REF_CLK_EN;
++		bcm_timer_writel(reg, TIMER_CLK_RST_CTL_REG);
+ 	} else {
+ 		return;
+ 	}