arch/powerpc/sysdev/qe_lib/usb.c

   1 /*
   2  * QE USB routines
   3  *
   4  * Copyright (c) Freescale Semicondutor, Inc. 2006.
   5  *               Shlomi Gridish <gridish@freescale.com>
   6  *               Jerry Huang <Chang-Ming.Huang@freescale.com>
   7  * Copyright (c) MontaVista Software, Inc. 2008.
   8  *               Anton Vorontsov <avorontsov@ru.mvista.com>
   9  *
  10  * This program is free software; you can redistribute  it and/or modify it
  11  * under  the terms of  the GNU General  Public License as published by the
  12  * Free Software Foundation;  either version 2 of the  License, or (at your
  13  * option) any later version.
  14  */
  15
  16 #include <linux/kernel.h>
  17 #include <linux/errno.h>
  18 #include <linux/io.h>
  19 #include <asm/immap_qe.h>
  20 #include <asm/qe.h>
  21
  22 int qe_usb_clock_set(enum qe_clock clk, int rate)
  23 {
  24         struct qe_mux __iomem *mux = &qe_immr->qmx;
  25         unsigned long flags;
  26         u32 val;
  27
  28         switch (clk) {
  29         case QE_CLK3:  val = QE_CMXGCR_USBCS_CLK3;  break;
  30         case QE_CLK5:  val = QE_CMXGCR_USBCS_CLK5;  break;
  31         case QE_CLK7:  val = QE_CMXGCR_USBCS_CLK7;  break;
  32         case QE_CLK9:  val = QE_CMXGCR_USBCS_CLK9;  break;
  33         case QE_CLK13: val = QE_CMXGCR_USBCS_CLK13; break;
  34         case QE_CLK17: val = QE_CMXGCR_USBCS_CLK17; break;
  35         case QE_CLK19: val = QE_CMXGCR_USBCS_CLK19; break;
  36         case QE_CLK21: val = QE_CMXGCR_USBCS_CLK21; break;
  37         case QE_BRG9:  val = QE_CMXGCR_USBCS_BRG9;  break;
  38         case QE_BRG10: val = QE_CMXGCR_USBCS_BRG10; break;
  39         default:
  40                 pr_err("%s: requested unknown clock %d\n", __func__, clk);
  41                 return -EINVAL;
  42         }
  43
  44         if (qe_clock_is_brg(clk))
  45                 qe_setbrg(clk, rate, 1);
  46
  47         spin_lock_irqsave(&cmxgcr_lock, flags);
  48
  49         clrsetbits_be32(&mux->cmxgcr, QE_CMXGCR_USBCS, val);
  50
  51         spin_unlock_irqrestore(&cmxgcr_lock, flags);
  52
  53         return 0;
  54 }
  55 EXPORT_SYMBOL(qe_usb_clock_set);