openwrt/target/linux/lantiq/patches-6.6/0051-MIPS-lantiq-improve-USB-initialization.patch

From 14909c4e4e836925668e74fc6e0e85ba0283cbf9 Mon Sep 17 00:00:00 2001
From: Hauke Mehrtens <hauke@hauke-m.de>
Date: Fri, 6 Jan 2017 17:40:12 +0100
Subject: [PATCH 2/2] MIPS: lantiq: improve USB initialization

This adds code to initialize the USB controller and PHY also on Danube,
Amazon SE and AR10. This code is based on the Vendor driver from
different UGW versions and compared to the hardware documentation.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
---
 arch/mips/lantiq/xway/sysctrl.c |  20 +++++++
 2 files changed, 110 insertions(+), 30 deletions(-)


--- a/arch/mips/lantiq/xway/sysctrl.c
+++ b/arch/mips/lantiq/xway/sysctrl.c
@@ -247,6 +247,25 @@ static void pmu_disable(struct clk *clk)
 		pr_warn("deactivating PMU module failed!");
 }
 
+static void usb_set_clock(void)
+{
+	unsigned int val = ltq_cgu_r32(ifccr);
+
+	if (of_machine_is_compatible("lantiq,ar10") ||
+	    of_machine_is_compatible("lantiq,grx390")) {
+		val &= ~0x03; /* XTAL divided by 3 */
+	} else if (of_machine_is_compatible("lantiq,ar9") ||
+		   of_machine_is_compatible("lantiq,vr9")) {
+		/* TODO: this depends on the XTAL frequency */
+		val |= 0x03; /* XTAL divided by 3 */
+	} else if (of_machine_is_compatible("lantiq,ase")) {
+		val |= 0x20; /* from XTAL */
+	} else if (of_machine_is_compatible("lantiq,danube")) {
+		val |= 0x30; /* 12 MHz, generated from 36 MHz */
+	}
+	ltq_cgu_w32(val, ifccr);
+}
+
 /* the pci enable helper */
 static int pci_enable(struct clk *clk)
 {
@@ -588,4 +607,5 @@ void __init ltq_soc_init(void)
 		clkdev_add_pmu("1e116000.mei", "dfe", 1, 0, PMU_DFE);
 		clkdev_add_pmu("1e100400.serial", NULL, 1, 0, PMU_ASC0);
 	}
+	usb_set_clock();
 }