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 <soc/fsl/qe/immap_qe.h> 21 #include <soc/fsl/qe/qe.h> 22 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