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jh7100_gmac.c revision 1.1 
      1 /* $NetBSD: jh7100_gmac.c,v 1.1 2024/10/26 15:49:43 skrll Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2024 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Nick Hudson
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 __KERNEL_RCSID(0, "$NetBSD: jh7100_gmac.c,v 1.1 2024/10/26 15:49:43 skrll Exp $");
     34 
     35 #include <sys/param.h>
     36 
     37 #include <sys/param.h>
     38 #include <sys/bus.h>
     39 #include <sys/device.h>
     40 #include <sys/rndsource.h>
     41 
     42 #include <net/if_ether.h>
     43 #include <net/if_media.h>
     44 
     45 #include <dev/fdt/fdtvar.h>
     46 
     47 #include <dev/mii/miivar.h>
     48 
     49 #include <dev/ic/dwc_gmac_var.h>
     50 #include <dev/ic/dwc_gmac_reg.h>
     51 
     52 #include <prop/proplib.h>
     53 
     54 #include <riscv/starfive/jh71x0_eth.h>
     55 
     56 struct jh7100_gmac_softc {
     57 	struct dwc_gmac_softc	sc_gmac;
     58 	struct jh71x0_eth_softc	sc_jh71x0eth;
     59 };
     60 
     61 static void
     62 jh7100_gmac_set_speed(struct dwc_gmac_softc *gmac_sc, int speed)
     63 {
     64 	struct jh7100_gmac_softc * const sc =
     65 	    container_of(gmac_sc, struct jh7100_gmac_softc, sc_gmac);
     66 	struct jh71x0_eth_softc * const jheth_sc = &sc->sc_jh71x0eth;
     67 
     68 	u_int rate = clk_get_rate(jheth_sc->sc_clk_tx);
     69 	switch (speed) {
     70 	case IFM_10_T:
     71 		rate = 2500000;
     72 		break;
     73 	case IFM_100_TX:
     74 		rate = 25000000;
     75 		break;
     76 	case IFM_1000_T:
     77 		rate = 125000000;
     78 	default:
     79 		// error unsupported
     80 		break;
     81 	}
     82 
     83 	int error = clk_set_rate(jheth_sc->sc_clk_tx, rate);
     84 	if (error)
     85 		aprint_error_dev(jheth_sc->sc_dev, "failed to set TX rate %u",
     86 		    rate);
     87 }
     88 
     89 static int
     90 jh7100_gmac_intr(void *arg)
     91 {
     92 	return dwc_gmac_intr(arg);
     93 }
     94 
     95 /* Compat string(s) */
     96 static const struct device_compatible_entry compat_data[] = {
     97 	{ .compat = "starfive,jh7100-dwmac" },
     98 	DEVICE_COMPAT_EOL
     99 };
    100 
    101 static int
    102 jh7100_gmac_match(device_t parent, cfdata_t cf, void *aux)
    103 {
    104 	struct fdt_attach_args * const faa = aux;
    105 
    106 	return of_compatible_match(faa->faa_phandle, compat_data);
    107 }
    108 
    109 static void
    110 jh7100_gmac_attach(device_t parent, device_t self, void *aux)
    111 {
    112 	struct jh7100_gmac_softc * const sc = device_private(self);
    113 	struct jh71x0_eth_softc * const jheth_sc = &sc->sc_jh71x0eth;
    114 	struct dwc_gmac_softc * const gmac_sc = &sc->sc_gmac;
    115 	struct fdt_attach_args * const faa = aux;
    116 	const int phandle = faa->faa_phandle;
    117 	char intrstr[128];
    118 	int error;
    119 
    120 	sc->sc_gmac.sc_dev = self;
    121 	sc->sc_gmac.sc_bst = faa->faa_bst;
    122 	sc->sc_gmac.sc_dmat = faa->faa_dmat;
    123 	sc->sc_jh71x0eth.sc_dev = self;
    124 	sc->sc_jh71x0eth.sc_phy = MII_PHY_ANY;
    125 	sc->sc_jh71x0eth.sc_type = JH71X0ETH_GMAC;
    126 
    127 	error = jh71x0_eth_attach(jheth_sc, faa, &sc->sc_gmac.sc_bsh);
    128 	if (error)
    129 		return;
    130 
    131 	if (sc->sc_jh71x0eth.sc_clk_tx) {
    132 		sc->sc_gmac.sc_set_speed = jh7100_gmac_set_speed;
    133 	}
    134 
    135 	aprint_naive("\n");
    136 	aprint_normal(": Gigabit Ethernet Controller\n");
    137 
    138 	error = dwc_gmac_attach(gmac_sc, sc->sc_jh71x0eth.sc_phy,
    139 	    GMAC_MII_CLK_150_250M_DIV102);
    140 	if (error)
    141 		return;
    142 
    143 	if (!fdtbus_intr_str(phandle, 0, intrstr, sizeof(intrstr))) {
    144 		aprint_error(": failed to decode interrupt\n");
    145 		return;
    146 	}
    147 	void *ih = fdtbus_intr_establish_xname(phandle, 0, IPL_NET,
    148 	    FDT_INTR_MPSAFE, jh7100_gmac_intr, sc, device_xname(self));
    149 	if (ih == NULL) {
    150 		aprint_error_dev(self, "failed to establish interrupt on %s\n",
    151 		    intrstr);
    152 		// XXXNH unwind
    153 		return;
    154 	}
    155 	aprint_normal_dev(self, "interrupting on %s\n", intrstr);
    156 }
    157 
    158 
    159 CFATTACH_DECL_NEW(jh7100_gmac, sizeof(struct jh7100_gmac_softc),
    160     jh7100_gmac_match, jh7100_gmac_attach, NULL, NULL);
    161