1 /*- 2 * Copyright (c) 2016 Jared McNeill <jmcneill@invisible.ca> 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 14 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 15 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 16 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 17 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 18 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 19 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 20 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 21 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23 * SUCH DAMAGE. 24 */ 25 26 /* 27 * Allwinner GMAC clock 28 */ 29 30 #include <sys/param.h> 31 #include <sys/systm.h> 32 #include <sys/bus.h> 33 #include <sys/rman.h> 34 #include <sys/kernel.h> 35 #include <sys/module.h> 36 #include <machine/bus.h> 37 38 #include <dev/ofw/ofw_bus.h> 39 #include <dev/ofw/ofw_bus_subr.h> 40 #include <dev/ofw/ofw_subr.h> 41 42 #include <dev/clk/clk_mux.h> 43 #include <dev/clk/clk_gate.h> 44 45 #include "clkdev_if.h" 46 47 #define GMAC_CLK_PIT (0x1 << 2) 48 #define GMAC_CLK_PIT_SHIFT 2 49 #define GMAC_CLK_PIT_MII 0 50 #define GMAC_CLK_PIT_RGMII 1 51 #define GMAC_CLK_SRC (0x3 << 0) 52 #define GMAC_CLK_SRC_SHIFT 0 53 #define GMAC_CLK_SRC_MII 0 54 #define GMAC_CLK_SRC_EXT_RGMII 1 55 #define GMAC_CLK_SRC_RGMII 2 56 57 #define EMAC_TXC_DIV_CFG (1 << 15) 58 #define EMAC_TXC_DIV_CFG_SHIFT 15 59 #define EMAC_TXC_DIV_CFG_125MHZ 0 60 #define EMAC_TXC_DIV_CFG_25MHZ 1 61 #define EMAC_PHY_SELECT (1 << 16) 62 #define EMAC_PHY_SELECT_SHIFT 16 63 #define EMAC_PHY_SELECT_INT 0 64 #define EMAC_PHY_SELECT_EXT 1 65 #define EMAC_ETXDC (0x7 << 10) 66 #define EMAC_ETXDC_SHIFT 10 67 #define EMAC_ERXDC (0x1f << 5) 68 #define EMAC_ERXDC_SHIFT 5 69 70 #define CLK_IDX_MII 0 71 #define CLK_IDX_RGMII 1 72 #define CLK_IDX_COUNT 2 73 74 static struct ofw_compat_data compat_data[] = { 75 { "allwinner,sun7i-a20-gmac-clk", 1 }, 76 { NULL, 0 } 77 }; 78 79 struct aw_gmacclk_sc { 80 device_t clkdev; 81 bus_addr_t reg; 82 83 int rx_delay; 84 int tx_delay; 85 }; 86 87 #define GMACCLK_READ(sc, val) CLKDEV_READ_4((sc)->clkdev, (sc)->reg, (val)) 88 #define GMACCLK_WRITE(sc, val) CLKDEV_WRITE_4((sc)->clkdev, (sc)->reg, (val)) 89 #define DEVICE_LOCK(sc) CLKDEV_DEVICE_LOCK((sc)->clkdev) 90 #define DEVICE_UNLOCK(sc) CLKDEV_DEVICE_UNLOCK((sc)->clkdev) 91 92 static int 93 aw_gmacclk_init(struct clknode *clk, device_t dev) 94 { 95 struct aw_gmacclk_sc *sc; 96 uint32_t val, index; 97 98 sc = clknode_get_softc(clk); 99 100 DEVICE_LOCK(sc); 101 GMACCLK_READ(sc, &val); 102 DEVICE_UNLOCK(sc); 103 104 switch ((val & GMAC_CLK_SRC) >> GMAC_CLK_SRC_SHIFT) { 105 case GMAC_CLK_SRC_MII: 106 index = CLK_IDX_MII; 107 break; 108 case GMAC_CLK_SRC_RGMII: 109 index = CLK_IDX_RGMII; 110 break; 111 default: 112 return (ENXIO); 113 } 114 115 clknode_init_parent_idx(clk, index); 116 return (0); 117 } 118 119 static int 120 aw_gmacclk_set_mux(struct clknode *clk, int index) 121 { 122 struct aw_gmacclk_sc *sc; 123 uint32_t val, clk_src, pit; 124 125 sc = clknode_get_softc(clk); 126 127 switch (index) { 128 case CLK_IDX_MII: 129 clk_src = GMAC_CLK_SRC_MII; 130 pit = GMAC_CLK_PIT_MII; 131 break; 132 case CLK_IDX_RGMII: 133 clk_src = GMAC_CLK_SRC_RGMII; 134 pit = GMAC_CLK_PIT_RGMII; 135 break; 136 default: 137 return (ENXIO); 138 } 139 140 DEVICE_LOCK(sc); 141 GMACCLK_READ(sc, &val); 142 val &= ~(GMAC_CLK_SRC | GMAC_CLK_PIT); 143 val |= (clk_src << GMAC_CLK_SRC_SHIFT); 144 val |= (pit << GMAC_CLK_PIT_SHIFT); 145 GMACCLK_WRITE(sc, val); 146 DEVICE_UNLOCK(sc); 147 148 return (0); 149 } 150 151 static clknode_method_t aw_gmacclk_clknode_methods[] = { 152 /* Device interface */ 153 CLKNODEMETHOD(clknode_init, aw_gmacclk_init), 154 CLKNODEMETHOD(clknode_set_mux, aw_gmacclk_set_mux), 155 CLKNODEMETHOD_END 156 }; 157 DEFINE_CLASS_1(aw_gmacclk_clknode, aw_gmacclk_clknode_class, 158 aw_gmacclk_clknode_methods, sizeof(struct aw_gmacclk_sc), clknode_class); 159 160 static int 161 aw_gmacclk_probe(device_t dev) 162 { 163 if (!ofw_bus_status_okay(dev)) 164 return (ENXIO); 165 166 if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0) 167 return (ENXIO); 168 169 device_set_desc(dev, "Allwinner GMAC Clock"); 170 return (BUS_PROBE_DEFAULT); 171 } 172 173 static int 174 aw_gmacclk_attach(device_t dev) 175 { 176 struct clknode_init_def def; 177 struct aw_gmacclk_sc *sc; 178 struct clkdom *clkdom; 179 struct clknode *clk; 180 clk_t clk_parent; 181 bus_addr_t paddr; 182 bus_size_t psize; 183 phandle_t node; 184 int error, ncells, i; 185 186 node = ofw_bus_get_node(dev); 187 188 if (ofw_reg_to_paddr(node, 0, &paddr, &psize, NULL) != 0) { 189 device_printf(dev, "cannot parse 'reg' property\n"); 190 return (ENXIO); 191 } 192 193 error = ofw_bus_parse_xref_list_get_length(node, "clocks", 194 "#clock-cells", &ncells); 195 if (error != 0 || ncells != CLK_IDX_COUNT) { 196 device_printf(dev, "couldn't find parent clocks\n"); 197 return (ENXIO); 198 } 199 200 clkdom = clkdom_create(dev); 201 202 memset(&def, 0, sizeof(def)); 203 error = clk_parse_ofw_clk_name(dev, node, &def.name); 204 if (error != 0) { 205 device_printf(dev, "cannot parse clock name\n"); 206 error = ENXIO; 207 goto fail; 208 } 209 def.id = 1; 210 def.parent_names = malloc(sizeof(char *) * ncells, M_OFWPROP, M_WAITOK); 211 for (i = 0; i < ncells; i++) { 212 error = clk_get_by_ofw_index(dev, 0, i, &clk_parent); 213 if (error != 0) { 214 device_printf(dev, "cannot get clock %d\n", error); 215 goto fail; 216 } 217 def.parent_names[i] = clk_get_name(clk_parent); 218 clk_release(clk_parent); 219 } 220 def.parent_cnt = ncells; 221 222 clk = clknode_create(clkdom, &aw_gmacclk_clknode_class, &def); 223 if (clk == NULL) { 224 device_printf(dev, "cannot create clknode\n"); 225 error = ENXIO; 226 goto fail; 227 } 228 229 sc = clknode_get_softc(clk); 230 sc->reg = paddr; 231 sc->clkdev = device_get_parent(dev); 232 sc->tx_delay = sc->rx_delay = -1; 233 OF_getencprop(node, "tx-delay", &sc->tx_delay, sizeof(sc->tx_delay)); 234 OF_getencprop(node, "rx-delay", &sc->rx_delay, sizeof(sc->rx_delay)); 235 236 clknode_register(clkdom, clk); 237 238 if (clkdom_finit(clkdom) != 0) { 239 device_printf(dev, "cannot finalize clkdom initialization\n"); 240 error = ENXIO; 241 goto fail; 242 } 243 244 if (bootverbose) 245 clkdom_dump(clkdom); 246 247 return (0); 248 249 fail: 250 return (error); 251 } 252 253 static device_method_t aw_gmacclk_methods[] = { 254 /* Device interface */ 255 DEVMETHOD(device_probe, aw_gmacclk_probe), 256 DEVMETHOD(device_attach, aw_gmacclk_attach), 257 258 DEVMETHOD_END 259 }; 260 261 static driver_t aw_gmacclk_driver = { 262 "aw_gmacclk", 263 aw_gmacclk_methods, 264 0 265 }; 266 267 EARLY_DRIVER_MODULE(aw_gmacclk, simplebus, aw_gmacclk_driver, 0, 0, 268 BUS_PASS_RESOURCE + BUS_PASS_ORDER_MIDDLE); 269