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sunxi_ccu_nkmp.c revision 1.1 
      1 /* $NetBSD: sunxi_ccu_nkmp.c,v 1.1 2017/06/29 09:26:06 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_nkmp.c,v 1.1 2017/06/29 09:26:06 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 int
     40 sunxi_ccu_nkmp_enable(struct sunxi_ccu_softc *sc, struct sunxi_ccu_clk *clk,
     41     int enable)
     42 {
     43 	struct sunxi_ccu_nkmp *nkmp = &clk->u.nkmp;
     44 	uint32_t val;
     45 
     46 	KASSERT(clk->type == SUNXI_CCU_NKMP);
     47 
     48 	if (!nkmp->enable)
     49 		return enable ? 0 : EINVAL;
     50 
     51 	val = CCU_READ(sc, nkmp->reg);
     52 	if (enable)
     53 		val |= nkmp->enable;
     54 	else
     55 		val &= ~nkmp->enable;
     56 	CCU_WRITE(sc, nkmp->reg, val);
     57 
     58 	return 0;
     59 }
     60 
     61 u_int
     62 sunxi_ccu_nkmp_get_rate(struct sunxi_ccu_softc *sc,
     63     struct sunxi_ccu_clk *clk)
     64 {
     65 	struct sunxi_ccu_nkmp *nkmp = &clk->u.nkmp;
     66 	struct clk *clkp, *clkp_parent;
     67 	u_int rate, n, k, m, p;
     68 	uint32_t val;
     69 
     70 	KASSERT(clk->type == SUNXI_CCU_NKMP);
     71 
     72 	clkp = &clk->base;
     73 	clkp_parent = clk_get_parent(clkp);
     74 	if (clkp_parent == NULL)
     75 		return 0;
     76 
     77 	rate = clk_get_rate(clkp_parent);
     78 	if (rate == 0)
     79 		return 0;
     80 
     81 	val = CCU_READ(sc, nkmp->reg);
     82 	n = __SHIFTOUT(val, nkmp->n);
     83 	k = __SHIFTOUT(val, nkmp->k);
     84 	if (nkmp->m)
     85 		m = __SHIFTOUT(val, nkmp->m);
     86 	else
     87 		m = 0;
     88 	p = __SHIFTOUT(val, nkmp->p);
     89 
     90 	if (nkmp->enable && !(val & nkmp->enable))
     91 		return 0;
     92 
     93 	n++;
     94 	k++;
     95 	m++;
     96 	p++;
     97 
     98 	return (u_int)((uint64_t)rate * n * k) / (m * p);
     99 }
    100 
    101 int
    102 sunxi_ccu_nkmp_set_rate(struct sunxi_ccu_softc *sc,
    103     struct sunxi_ccu_clk *clk, u_int rate)
    104 {
    105 	return EIO;
    106 }
    107 
    108 const char *
    109 sunxi_ccu_nkmp_get_parent(struct sunxi_ccu_softc *sc,
    110     struct sunxi_ccu_clk *clk)
    111 {
    112 	struct sunxi_ccu_nkmp *nkmp = &clk->u.nkmp;
    113 
    114 	KASSERT(clk->type == SUNXI_CCU_NKMP);
    115 
    116 	return nkmp->parent;
    117 }
    118