target/linux/lantiq/patches-4.14/0051-MIPS-lantiq-improve-USB-initialization.patch

   1 From 14909c4e4e836925668e74fc6e0e85ba0283cbf9 Mon Sep 17 00:00:00 2001
   2 From: Hauke Mehrtens <hauke@hauke-m.de>
   3 Date: Fri, 6 Jan 2017 17:40:12 +0100
   4 Subject: [PATCH 2/2] MIPS: lantiq: improve USB initialization
   5
   6 This adds code to initialize the USB controller and PHY also on Danube,
   7 Amazon SE and AR10. This code is based on the Vendor driver from
   8 different UGW versions and compared to the hardware documentation.
   9
  10 Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
  11 ---
  12  arch/mips/lantiq/xway/sysctrl.c |  20 +++++++
  13  2 files changed, 110 insertions(+), 30 deletions(-)
  14
  15
  16 --- a/arch/mips/lantiq/xway/sysctrl.c
  17 +++ b/arch/mips/lantiq/xway/sysctrl.c
  18 @@ -246,6 +246,25 @@ static void pmu_disable(struct clk *clk)
  19                 pr_warn("deactivating PMU module failed!");
  20  }
  21
  22 +static void usb_set_clock(void)
  23 +{
  24 +       unsigned int val = ltq_cgu_r32(ifccr);
  25 +
  26 +       if (of_machine_is_compatible("lantiq,ar10") ||
  27 +           of_machine_is_compatible("lantiq,grx390")) {
  28 +               val &= ~0x03; /* XTAL divided by 3 */
  29 +       } else if (of_machine_is_compatible("lantiq,ar9") ||
  30 +                  of_machine_is_compatible("lantiq,vr9")) {
  31 +               /* TODO: this depends on the XTAL frequency */
  32 +               val |= 0x03; /* XTAL divided by 3 */
  33 +       } else if (of_machine_is_compatible("lantiq,ase")) {
  34 +               val |= 0x20; /* from XTAL */
  35 +       } else if (of_machine_is_compatible("lantiq,danube")) {
  36 +               val |= 0x30; /* 12 MHz, generated from 36 MHz */
  37 +       }
  38 +       ltq_cgu_w32(val, ifccr);
  39 +}
  40 +
  41  /* the pci enable helper */
  42  static int pci_enable(struct clk *clk)
  43  {
  44 @@ -569,4 +588,5 @@ void __init ltq_soc_init(void)
  45                 clkdev_add_pmu("1e116000.mei", "dfe", 1, 0, PMU_DFE);
  46                 clkdev_add_pmu("1e100400.serial", NULL, 1, 0, PMU_ASC0);
  47         }
  48 +       usb_set_clock();
  49  }