1 /*
2 * QE USB routines
3 *
4 * Copyright 2006 Freescale Semiconductor, Inc.
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/export.h>
19 #include <linux/io.h>
20 #include <asm/immap_qe.h>
21 #include <asm/qe.h>
22
qe_usb_clock_set(enum qe_clock clk,int rate)23 int qe_usb_clock_set(enum qe_clock clk, int rate)
24 {
25 struct qe_mux __iomem *mux = &qe_immr->qmx;
26 unsigned long flags;
27 u32 val;
28
29 switch (clk) {
30 case QE_CLK3: val = QE_CMXGCR_USBCS_CLK3; break;
31 case QE_CLK5: val = QE_CMXGCR_USBCS_CLK5; break;
32 case QE_CLK7: val = QE_CMXGCR_USBCS_CLK7; break;
33 case QE_CLK9: val = QE_CMXGCR_USBCS_CLK9; break;
34 case QE_CLK13: val = QE_CMXGCR_USBCS_CLK13; break;
35 case QE_CLK17: val = QE_CMXGCR_USBCS_CLK17; break;
36 case QE_CLK19: val = QE_CMXGCR_USBCS_CLK19; break;
37 case QE_CLK21: val = QE_CMXGCR_USBCS_CLK21; break;
38 case QE_BRG9: val = QE_CMXGCR_USBCS_BRG9; break;
39 case QE_BRG10: val = QE_CMXGCR_USBCS_BRG10; break;
40 default:
41 pr_err("%s: requested unknown clock %d\n", __func__, clk);
42 return -EINVAL;
43 }
44
45 if (qe_clock_is_brg(clk))
46 qe_setbrg(clk, rate, 1);
47
48 spin_lock_irqsave(&cmxgcr_lock, flags);
49
50 clrsetbits_be32(&mux->cmxgcr, QE_CMXGCR_USBCS, val);
51
52 spin_unlock_irqrestore(&cmxgcr_lock, flags);
53
54 return 0;
55 }
56 EXPORT_SYMBOL(qe_usb_clock_set);
57