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      1 /* $NetBSD: sun9i_a80_mmcclk.c,v 1.3 2021/01/27 03:10:20 thorpej 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 
     31 __KERNEL_RCSID(1, "$NetBSD: sun9i_a80_mmcclk.c,v 1.3 2021/01/27 03:10:20 thorpej Exp $");
     32 
     33 #include <sys/param.h>
     34 #include <sys/bus.h>
     35 #include <sys/device.h>
     36 #include <sys/systm.h>
     37 
     38 #include <dev/fdt/fdtvar.h>
     39 
     40 #include <arm/sunxi/sunxi_ccu.h>
     41 
     42 #define	SDC_COMM(port)	(0x04 * (port))
     43 
     44 static int sun9i_a80_mmcclk_match(device_t, cfdata_t, void *);
     45 static void sun9i_a80_mmcclk_attach(device_t, device_t, void *);
     46 
     47 static const struct device_compatible_entry compat_data[] = {
     48 	{ .compat = "allwinner,sun9i-a80-mmc-config-clk" },
     49 	DEVICE_COMPAT_EOL
     50 };
     51 
     52 CFATTACH_DECL_NEW(sunxi_a80_mmcclk, sizeof(struct sunxi_ccu_softc),
     53 	sun9i_a80_mmcclk_match, sun9i_a80_mmcclk_attach, NULL, NULL);
     54 
     55 static struct sunxi_ccu_reset sun9i_a80_mmcclk_resets[] = {
     56 	SUNXI_CCU_RESET(0, SDC_COMM(0), 18),
     57 	SUNXI_CCU_RESET(1, SDC_COMM(1), 18),
     58 	SUNXI_CCU_RESET(2, SDC_COMM(2), 18),
     59 	SUNXI_CCU_RESET(3, SDC_COMM(3), 18),
     60 };
     61 
     62 static struct sunxi_ccu_clk sun9i_a80_mmcclk_clks[] = {
     63 	SUNXI_CCU_GATE(0, "mmc0_config", "ahb", SDC_COMM(0), 16),
     64 	SUNXI_CCU_GATE(1, "mmc1_config", "ahb", SDC_COMM(1), 16),
     65 	SUNXI_CCU_GATE(2, "mmc2_config", "ahb", SDC_COMM(2), 16),
     66 	SUNXI_CCU_GATE(3, "mmc3_config", "ahb", SDC_COMM(3), 16),
     67 };
     68 
     69 static int
     70 sun9i_a80_mmcclk_match(device_t parent, cfdata_t cf, void *aux)
     71 {
     72 	struct fdt_attach_args * const faa = aux;
     73 
     74 	return of_compatible_match(faa->faa_phandle, compat_data);
     75 }
     76 
     77 static void
     78 sun9i_a80_mmcclk_attach(device_t parent, device_t self, void *aux)
     79 {
     80 	struct sunxi_ccu_softc * const sc = device_private(self);
     81 	struct fdt_attach_args * const faa = aux;
     82 	const int phandle = faa->faa_phandle;
     83 	struct fdtbus_reset *rst;
     84 	struct clk *clk;
     85 
     86 	sc->sc_dev = self;
     87 	sc->sc_phandle = faa->faa_phandle;
     88 	sc->sc_bst = faa->faa_bst;
     89 
     90 	sc->sc_resets = sun9i_a80_mmcclk_resets;
     91 	sc->sc_nresets = __arraycount(sun9i_a80_mmcclk_resets);
     92 
     93 	sc->sc_clks = sun9i_a80_mmcclk_clks;
     94 	sc->sc_nclks = __arraycount(sun9i_a80_mmcclk_clks);
     95 
     96 	clk = fdtbus_clock_get(phandle, "ahb");
     97 	if (clk == NULL || clk_enable(clk) != 0) {
     98 		aprint_error(": couldn't enable clock\n");
     99 		return;
    100 	}
    101 	rst = fdtbus_reset_get(phandle, "ahb");
    102 	if (rst == NULL || fdtbus_reset_deassert(rst) != 0) {
    103 		aprint_error(": couldn't de-assert reset\n");
    104 		return;
    105 	}
    106 
    107 	if (sunxi_ccu_attach(sc) != 0)
    108 		return;
    109 
    110 	aprint_naive("\n");
    111 	aprint_normal(": A80 SD/MMC-COMM\n");
    112 
    113 	sunxi_ccu_print(sc);
    114 }
    115