1 /* $NetBSD: sunxi_gmacclk.c,v 1.1 2017/10/07 13:28:59 jmcneill Exp $ */ 2 3 /*- 4 * Copyright (c) 2017 Jared McNeill <jmcneill@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_gmacclk.c,v 1.1 2017/10/07 13:28:59 jmcneill Exp $"); 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/device.h> 35 #include <sys/kmem.h> 36 #include <sys/bus.h> 37 38 #include <dev/clk/clk_backend.h> 39 40 #include <dev/fdt/fdtvar.h> 41 42 #define GMAC_CLK_PIT __BIT(2) 43 #define GMAC_CLK_PIT_MII 0 44 #define GMAC_CLK_PIT_RGMII 1 45 #define GMAC_CLK_SRC __BITS(1,0) 46 #define GMAC_CLK_SRC_MII 0 47 #define GMAC_CLK_SRC_EXT_RGMII 1 48 #define GMAC_CLK_SRC_RGMII 2 49 50 static int sunxi_gmacclk_match(device_t, cfdata_t, void *); 51 static void sunxi_gmacclk_attach(device_t, device_t, void *); 52 53 static struct clk *sunxi_gmacclk_decode(device_t, const void *, size_t); 54 55 static const struct fdtbus_clock_controller_func sunxi_gmacclk_fdt_funcs = { 56 .decode = sunxi_gmacclk_decode 57 }; 58 59 static struct clk *sunxi_gmacclk_get(void *, const char *); 60 static void sunxi_gmacclk_put(void *, struct clk *); 61 static int sunxi_gmacclk_set_rate(void *, struct clk *, u_int); 62 static u_int sunxi_gmacclk_get_rate(void *, struct clk *); 63 static struct clk *sunxi_gmacclk_get_parent(void *, struct clk *); 64 65 static const struct clk_funcs sunxi_gmacclk_clk_funcs = { 66 .get = sunxi_gmacclk_get, 67 .put = sunxi_gmacclk_put, 68 .set_rate = sunxi_gmacclk_set_rate, 69 .get_rate = sunxi_gmacclk_get_rate, 70 .get_parent = sunxi_gmacclk_get_parent, 71 }; 72 73 struct sunxi_gmacclk_softc { 74 device_t sc_dev; 75 int sc_phandle; 76 bus_space_tag_t sc_bst; 77 bus_space_handle_t sc_bsh; 78 79 struct clk_domain sc_clkdom; 80 struct clk sc_clk; 81 struct clk *sc_parent[2]; 82 }; 83 84 #define RD4(sc, reg) \ 85 bus_space_read_4((sc)->sc_bst, (sc)->sc_bsh, (reg)) 86 #define WR4(sc, reg, val) \ 87 bus_space_write_4((sc)->sc_bst, (sc)->sc_bsh, (reg), (val)) 88 89 CFATTACH_DECL_NEW(sunxi_gmacclk, sizeof(struct sunxi_gmacclk_softc), 90 sunxi_gmacclk_match, sunxi_gmacclk_attach, NULL, NULL); 91 92 static int 93 sunxi_gmacclk_match(device_t parent, cfdata_t cf, void *aux) 94 { 95 const char * const compatible[] = { "allwinner,sun7i-a20-gmac-clk", NULL }; 96 const struct fdt_attach_args *faa = aux; 97 98 return of_match_compatible(faa->faa_phandle, compatible); 99 } 100 101 static void 102 sunxi_gmacclk_attach(device_t parent, device_t self, void *aux) 103 { 104 struct sunxi_gmacclk_softc * const sc = device_private(self); 105 const struct fdt_attach_args *faa = aux; 106 const int phandle = faa->faa_phandle; 107 bus_addr_t addr; 108 bus_size_t size; 109 110 if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) { 111 aprint_error(": couldn't get registers\n"); 112 return; 113 } 114 115 sc->sc_dev = self; 116 sc->sc_phandle = phandle; 117 sc->sc_bst = faa->faa_bst; 118 if (bus_space_map(sc->sc_bst, addr, size, 0, &sc->sc_bsh) != 0) { 119 aprint_error(": couldn't map registers\n"); 120 return; 121 } 122 sc->sc_parent[0] = fdtbus_clock_get_index(phandle, 0); 123 sc->sc_parent[1] = fdtbus_clock_get_index(phandle, 1); 124 if (sc->sc_parent[0] == NULL || sc->sc_parent[1] == NULL) { 125 aprint_error(": couldn't get parent clocks\n"); 126 return; 127 } 128 129 sc->sc_clkdom.funcs = &sunxi_gmacclk_clk_funcs; 130 sc->sc_clkdom.priv = sc; 131 132 sc->sc_clk.domain = &sc->sc_clkdom; 133 sc->sc_clk.name = kmem_asprintf("%s", faa->faa_name); 134 135 aprint_naive("\n"); 136 aprint_normal(": GMAC MII/RGMII clock mux\n"); 137 138 fdtbus_register_clock_controller(self, phandle, &sunxi_gmacclk_fdt_funcs); 139 } 140 141 static struct clk * 142 sunxi_gmacclk_decode(device_t dev, const void *data, size_t len) 143 { 144 struct sunxi_gmacclk_softc * const sc = device_private(dev); 145 146 if (len != 0) 147 return NULL; 148 149 return &sc->sc_clk; 150 } 151 152 static struct clk * 153 sunxi_gmacclk_get(void *priv, const char *name) 154 { 155 struct sunxi_gmacclk_softc * const sc = priv; 156 157 if (strcmp(name, sc->sc_clk.name) != 0) 158 return NULL; 159 160 return &sc->sc_clk; 161 } 162 163 static void 164 sunxi_gmacclk_put(void *priv, struct clk *clk) 165 { 166 } 167 168 static int 169 sunxi_gmacclk_set_rate(void *priv, struct clk *clk, u_int rate) 170 { 171 struct sunxi_gmacclk_softc * const sc = priv; 172 uint32_t val; 173 174 val = RD4(sc, 0); 175 val &= ~(GMAC_CLK_PIT|GMAC_CLK_SRC); 176 if (rate == clk_get_rate(sc->sc_parent[GMAC_CLK_PIT_MII])) { 177 /* MII clock */ 178 val |= __SHIFTIN(GMAC_CLK_PIT_MII, GMAC_CLK_PIT); 179 val |= __SHIFTIN(GMAC_CLK_SRC_MII, GMAC_CLK_SRC); 180 } else if (rate == clk_get_rate(sc->sc_parent[GMAC_CLK_PIT_RGMII])) { 181 /* RGMII clock */ 182 val |= __SHIFTIN(GMAC_CLK_PIT_RGMII, GMAC_CLK_PIT); 183 val |= __SHIFTIN(GMAC_CLK_SRC_RGMII, GMAC_CLK_SRC); 184 } else { 185 return ENXIO; 186 } 187 WR4(sc, 0, val); 188 189 return 0; 190 } 191 192 static u_int 193 sunxi_gmacclk_get_rate(void *priv, struct clk *clk) 194 { 195 struct clk *clk_parent = clk_get_parent(clk); 196 197 return clk_get_rate(clk_parent); 198 } 199 200 static struct clk * 201 sunxi_gmacclk_get_parent(void *priv, struct clk *clk) 202 { 203 struct sunxi_gmacclk_softc * const sc = priv; 204 uint32_t val; 205 u_int sel; 206 207 val = RD4(sc, 0); 208 sel = __SHIFTOUT(val, GMAC_CLK_PIT); 209 210 return sc->sc_parent[sel]; 211 } 212