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sunxi_gmac.c revision 1.1 
      1 /* $NetBSD: sunxi_gmac.c,v 1.1 2017/10/07 13:28:59 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     26  * POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #include <sys/cdefs.h>
     30 
     31 __KERNEL_RCSID(0, "$NetBSD: sunxi_gmac.c,v 1.1 2017/10/07 13:28:59 jmcneill Exp $");
     32 
     33 #include <sys/param.h>
     34 #include <sys/bus.h>
     35 #include <sys/device.h>
     36 #include <sys/intr.h>
     37 #include <sys/systm.h>
     38 
     39 #include <net/if.h>
     40 #include <net/if_ether.h>
     41 #include <net/if_media.h>
     42 
     43 #include <dev/mii/miivar.h>
     44 
     45 #include <dev/ic/dwc_gmac_var.h>
     46 #include <dev/ic/dwc_gmac_reg.h>
     47 
     48 #include <dev/fdt/fdtvar.h>
     49 
     50 #define	GMAC_TX_RATE_MII		25000000
     51 #define	GMAC_TX_RATE_RGMII		125000000
     52 
     53 static const char * compatible[] = {
     54 	"allwinner,sun7i-a20-gmac",
     55 	NULL
     56 };
     57 
     58 static int
     59 sunxi_gmac_intr(void *arg)
     60 {
     61 	return dwc_gmac_intr(arg);
     62 }
     63 
     64 static int
     65 sunxi_gmac_match(device_t parent, cfdata_t cf, void *aux)
     66 {
     67 	struct fdt_attach_args * const faa = aux;
     68 
     69 	return of_match_compatible(faa->faa_phandle, compatible);
     70 }
     71 
     72 static void
     73 sunxi_gmac_attach(device_t parent, device_t self, void *aux)
     74 {
     75 	struct dwc_gmac_softc * const sc = device_private(self);
     76 	struct fdt_attach_args * const faa = aux;
     77 	const int phandle = faa->faa_phandle;
     78 	struct clk *clk_gmac, *clk_gmac_tx;
     79 	const char *phy_mode;
     80 	char intrstr[128];
     81 	bus_addr_t addr;
     82 	bus_size_t size;
     83 
     84 	if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) {
     85 		aprint_error(": couldn't get registers\n");
     86 		return;
     87 	}
     88 
     89 	sc->sc_dev = self;
     90 	sc->sc_bst = faa->faa_bst;
     91 	if (bus_space_map(sc->sc_bst, addr, size, 0, &sc->sc_bsh) != 0) {
     92 		aprint_error(": couldn't map registers\n");
     93 		return;
     94 	}
     95 	sc->sc_dmat = faa->faa_dmat;
     96 
     97 	if (!fdtbus_intr_str(phandle, 0, intrstr, sizeof(intrstr))) {
     98 		aprint_error(": failed to decode interrupt\n");
     99 		return;
    100 	}
    101 
    102 	clk_gmac = fdtbus_clock_get(phandle, "stmmaceth");
    103 	clk_gmac_tx = fdtbus_clock_get(phandle, "allwinner_gmac_tx");
    104 	if (clk_gmac == NULL || clk_gmac_tx == NULL) {
    105 		aprint_error(": couldn't get clocks\n");
    106 		return;
    107 	}
    108 
    109 	phy_mode = fdtbus_get_string(phandle, "phy-mode");
    110 	if (phy_mode == NULL) {
    111 		aprint_error(": missing 'phy-mode' property\n");
    112 		return;
    113 	}
    114 	if (strcmp(phy_mode, "mii") == 0) {
    115 		if (clk_set_rate(clk_gmac_tx, GMAC_TX_RATE_MII) != 0) {
    116 			aprint_error(": failed to set TX clock rate (MII)\n");
    117 			return;
    118 		}
    119 	} else if (strcmp(phy_mode, "rgmii") == 0) {
    120 		if (clk_set_rate(clk_gmac_tx, GMAC_TX_RATE_RGMII) != 0) {
    121 			aprint_error(": failed to set TX clock rate (RGMII)\n");
    122 			return;
    123 		}
    124 	} else {
    125 		aprint_error(": unsupported phy-mode '%s'\n", phy_mode);
    126 		return;
    127 	}
    128 
    129 	if (clk_enable(clk_gmac_tx) != 0 || clk_enable(clk_gmac) != 0) {
    130 		aprint_error(": couldn't enable clocks\n");
    131 		return;
    132 	}
    133 
    134 	aprint_naive("\n");
    135 	aprint_normal(": GMAC\n");
    136 
    137 	if (fdtbus_intr_establish(phandle, 0, IPL_NET, 0, sunxi_gmac_intr, sc) == NULL) {
    138 		aprint_error_dev(self, "failed to establish interrupt on %s\n", intrstr);
    139 		return;
    140 	}
    141 	aprint_normal_dev(self, "interrupting on %s\n", intrstr);
    142 
    143 	dwc_gmac_attach(sc, GMAC_MII_CLK_150_250M_DIV102);
    144 }
    145 
    146 CFATTACH_DECL_NEW(sunxi_gmac, sizeof(struct dwc_gmac_softc),
    147 	sunxi_gmac_match, sunxi_gmac_attach, NULL, NULL);
    148