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sunxi_ccu_nm.c revision 1.1 
      1 /* $NetBSD: sunxi_ccu_nm.c,v 1.1 2017/06/28 23:51:29 jmcneill Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2017 Jared McNeill <jmcneill (at) invisible.ca>
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     21  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     22  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     23  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     24  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  */
     28 
     29 #include <sys/cdefs.h>
     30 __KERNEL_RCSID(0, "$NetBSD: sunxi_ccu_nm.c,v 1.1 2017/06/28 23:51:29 jmcneill Exp $");
     31 
     32 #include <sys/param.h>
     33 #include <sys/bus.h>
     34 
     35 #include <dev/clk/clk_backend.h>
     36 
     37 #include <arm/sunxi/sunxi_ccu.h>
     38 
     39 u_int
     40 sunxi_ccu_nm_get_rate(struct sunxi_ccu_softc *sc,
     41     struct sunxi_ccu_clk *clk)
     42 {
     43 	struct sunxi_ccu_nm *nm = &clk->u.nm;
     44 	struct clk *clkp, *clkp_parent;
     45 	u_int rate, n, m;
     46 	uint32_t val;
     47 
     48 	KASSERT(clk->type == SUNXI_CCU_NM);
     49 
     50 	clkp = &clk->base;
     51 	clkp_parent = clk_get_parent(clkp);
     52 	if (clkp_parent == NULL)
     53 		return 0;
     54 
     55 	rate = clk_get_rate(clkp_parent);
     56 	if (rate == 0)
     57 		return 0;
     58 
     59 	val = CCU_READ(sc, nm->reg);
     60 	n = __SHIFTOUT(val, nm->n);
     61 	m = __SHIFTOUT(val, nm->m);
     62 
     63 	if (nm->flags & SUNXI_CCU_NM_POWER_OF_TWO)
     64 		n <<= 1;
     65 	else
     66 		n++;
     67 
     68 	m++;
     69 
     70 	return rate / n / m;
     71 }
     72 
     73 int
     74 sunxi_ccu_nm_set_rate(struct sunxi_ccu_softc *sc,
     75     struct sunxi_ccu_clk *clk, u_int rate)
     76 {
     77 	return EIO;
     78 }
     79 
     80 int
     81 sunxi_ccu_nm_set_parent(struct sunxi_ccu_softc *sc,
     82     struct sunxi_ccu_clk *clk, const char *name)
     83 {
     84 	struct sunxi_ccu_nm *nm = &clk->u.nm;
     85 	uint32_t val;
     86 	u_int index;
     87 
     88 	KASSERT(clk->type == SUNXI_CCU_NM);
     89 
     90 	if (nm->sel == 0)
     91 		return ENODEV;
     92 
     93 	for (index = 0; index < nm->nparents; index++) {
     94 		if (nm->parents[index] != NULL &&
     95 		    strcmp(nm->parents[index], name) == 0)
     96 			break;
     97 	}
     98 	if (index == nm->nparents)
     99 		return EINVAL;
    100 
    101 	val = CCU_READ(sc, nm->reg);
    102 	val &= ~nm->sel;
    103 	val |= __SHIFTIN(index, nm->sel);
    104 	CCU_WRITE(sc, nm->reg, val);
    105 
    106 	return 0;
    107 }
    108 
    109 const char *
    110 sunxi_ccu_nm_get_parent(struct sunxi_ccu_softc *sc,
    111     struct sunxi_ccu_clk *clk)
    112 {
    113 	struct sunxi_ccu_nm *nm = &clk->u.nm;
    114 	u_int index;
    115 	uint32_t val;
    116 
    117 	KASSERT(clk->type == SUNXI_CCU_NM);
    118 
    119 	val = CCU_READ(sc, nm->reg);
    120 	index = __SHIFTOUT(val, nm->sel);
    121 
    122 	return nm->parents[index];
    123 }
    124