ti_div_clock.c revision 1.1.10.2
1 1.1.10.2 martin /* $NetBSD: ti_div_clock.c,v 1.1.10.2 2020/04/13 08:03:38 martin Exp $ */ 2 1.1.10.2 martin 3 1.1.10.2 martin /*- 4 1.1.10.2 martin * Copyright (c) 2019 Jared McNeill <jmcneill (at) invisible.ca> 5 1.1.10.2 martin * All rights reserved. 6 1.1.10.2 martin * 7 1.1.10.2 martin * Redistribution and use in source and binary forms, with or without 8 1.1.10.2 martin * modification, are permitted provided that the following conditions 9 1.1.10.2 martin * are met: 10 1.1.10.2 martin * 1. Redistributions of source code must retain the above copyright 11 1.1.10.2 martin * notice, this list of conditions and the following disclaimer. 12 1.1.10.2 martin * 2. Redistributions in binary form must reproduce the above copyright 13 1.1.10.2 martin * notice, this list of conditions and the following disclaimer in the 14 1.1.10.2 martin * documentation and/or other materials provided with the distribution. 15 1.1.10.2 martin * 16 1.1.10.2 martin * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 1.1.10.2 martin * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 1.1.10.2 martin * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 1.1.10.2 martin * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 1.1.10.2 martin * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 1.1.10.2 martin * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 22 1.1.10.2 martin * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 1.1.10.2 martin * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 1.1.10.2 martin * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 1.1.10.2 martin * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 1.1.10.2 martin * SUCH DAMAGE. 27 1.1.10.2 martin */ 28 1.1.10.2 martin 29 1.1.10.2 martin #include <sys/cdefs.h> 30 1.1.10.2 martin __KERNEL_RCSID(0, "$NetBSD: ti_div_clock.c,v 1.1.10.2 2020/04/13 08:03:38 martin Exp $"); 31 1.1.10.2 martin 32 1.1.10.2 martin #include <sys/param.h> 33 1.1.10.2 martin #include <sys/systm.h> 34 1.1.10.2 martin #include <sys/device.h> 35 1.1.10.2 martin #include <sys/kmem.h> 36 1.1.10.2 martin #include <sys/bus.h> 37 1.1.10.2 martin 38 1.1.10.2 martin #include <dev/clk/clk_backend.h> 39 1.1.10.2 martin 40 1.1.10.2 martin #include <dev/fdt/fdtvar.h> 41 1.1.10.2 martin 42 1.1.10.2 martin static const char * const compatible[] = { 43 1.1.10.2 martin "ti,divider-clock", 44 1.1.10.2 martin NULL 45 1.1.10.2 martin }; 46 1.1.10.2 martin 47 1.1.10.2 martin static int ti_div_clock_match(device_t, cfdata_t, void *); 48 1.1.10.2 martin static void ti_div_clock_attach(device_t, device_t, void *); 49 1.1.10.2 martin 50 1.1.10.2 martin static struct clk *ti_div_clock_decode(device_t, int, const void *, size_t); 51 1.1.10.2 martin 52 1.1.10.2 martin static const struct fdtbus_clock_controller_func ti_div_clock_fdt_funcs = { 53 1.1.10.2 martin .decode = ti_div_clock_decode 54 1.1.10.2 martin }; 55 1.1.10.2 martin 56 1.1.10.2 martin static struct clk *ti_div_clock_get(void *, const char *); 57 1.1.10.2 martin static void ti_div_clock_put(void *, struct clk *); 58 1.1.10.2 martin static u_int ti_div_clock_get_rate(void *, struct clk *); 59 1.1.10.2 martin static struct clk *ti_div_clock_get_parent(void *, struct clk *); 60 1.1.10.2 martin 61 1.1.10.2 martin static const struct clk_funcs ti_div_clock_clk_funcs = { 62 1.1.10.2 martin .get = ti_div_clock_get, 63 1.1.10.2 martin .put = ti_div_clock_put, 64 1.1.10.2 martin .get_rate = ti_div_clock_get_rate, 65 1.1.10.2 martin .get_parent = ti_div_clock_get_parent, 66 1.1.10.2 martin }; 67 1.1.10.2 martin 68 1.1.10.2 martin struct ti_div_clock_softc { 69 1.1.10.2 martin device_t sc_dev; 70 1.1.10.2 martin int sc_phandle; 71 1.1.10.2 martin bus_space_tag_t sc_bst; 72 1.1.10.2 martin bus_space_handle_t sc_bsh; 73 1.1.10.2 martin 74 1.1.10.2 martin struct clk_domain sc_clkdom; 75 1.1.10.2 martin struct clk sc_clk; 76 1.1.10.2 martin }; 77 1.1.10.2 martin 78 1.1.10.2 martin #define RD4(sc) \ 79 1.1.10.2 martin bus_space_read_4((sc)->sc_bst, (sc)->sc_bsh, 0) 80 1.1.10.2 martin #define WR4(sc, val) \ 81 1.1.10.2 martin bus_space_write_4((sc)->sc_bst, (sc)->sc_bsh, 0, (val)) 82 1.1.10.2 martin 83 1.1.10.2 martin CFATTACH_DECL_NEW(ti_div_clock, sizeof(struct ti_div_clock_softc), 84 1.1.10.2 martin ti_div_clock_match, ti_div_clock_attach, NULL, NULL); 85 1.1.10.2 martin 86 1.1.10.2 martin static int 87 1.1.10.2 martin ti_div_clock_match(device_t parent, cfdata_t cf, void *aux) 88 1.1.10.2 martin { 89 1.1.10.2 martin const struct fdt_attach_args *faa = aux; 90 1.1.10.2 martin 91 1.1.10.2 martin return of_match_compatible(faa->faa_phandle, compatible); 92 1.1.10.2 martin } 93 1.1.10.2 martin 94 1.1.10.2 martin static void 95 1.1.10.2 martin ti_div_clock_attach(device_t parent, device_t self, void *aux) 96 1.1.10.2 martin { 97 1.1.10.2 martin struct ti_div_clock_softc * const sc = device_private(self); 98 1.1.10.2 martin const struct fdt_attach_args *faa = aux; 99 1.1.10.2 martin const int phandle = faa->faa_phandle; 100 1.1.10.2 martin bus_addr_t addr, base_addr; 101 1.1.10.2 martin 102 1.1.10.2 martin const int prcm_phandle = OF_parent(OF_parent(phandle)); 103 1.1.10.2 martin if (fdtbus_get_reg(phandle, 0, &addr, NULL) != 0 || 104 1.1.10.2 martin fdtbus_get_reg(prcm_phandle, 0, &base_addr, NULL) != 0) { 105 1.1.10.2 martin aprint_error(": couldn't get registers\n"); 106 1.1.10.2 martin return; 107 1.1.10.2 martin } 108 1.1.10.2 martin 109 1.1.10.2 martin sc->sc_dev = self; 110 1.1.10.2 martin sc->sc_phandle = phandle; 111 1.1.10.2 martin sc->sc_bst = faa->faa_bst; 112 1.1.10.2 martin if (bus_space_map(sc->sc_bst, base_addr + addr, 4, 0, &sc->sc_bsh) != 0) { 113 1.1.10.2 martin aprint_error(": couldn't map registers\n"); 114 1.1.10.2 martin return; 115 1.1.10.2 martin } 116 1.1.10.2 martin 117 1.1.10.2 martin sc->sc_clkdom.name = device_xname(self); 118 1.1.10.2 martin sc->sc_clkdom.funcs = &ti_div_clock_clk_funcs; 119 1.1.10.2 martin sc->sc_clkdom.priv = sc; 120 1.1.10.2 martin 121 1.1.10.2 martin sc->sc_clk.domain = &sc->sc_clkdom; 122 1.1.10.2 martin sc->sc_clk.name = kmem_asprintf("%s", faa->faa_name); 123 1.1.10.2 martin clk_attach(&sc->sc_clk); 124 1.1.10.2 martin 125 1.1.10.2 martin aprint_naive("\n"); 126 1.1.10.2 martin aprint_normal(": TI divider clock (%s)\n", sc->sc_clk.name); 127 1.1.10.2 martin 128 1.1.10.2 martin fdtbus_register_clock_controller(self, phandle, &ti_div_clock_fdt_funcs); 129 1.1.10.2 martin } 130 1.1.10.2 martin 131 1.1.10.2 martin static struct clk * 132 1.1.10.2 martin ti_div_clock_decode(device_t dev, int cc_phandle, const void *data, 133 1.1.10.2 martin size_t len) 134 1.1.10.2 martin { 135 1.1.10.2 martin struct ti_div_clock_softc * const sc = device_private(dev); 136 1.1.10.2 martin 137 1.1.10.2 martin return &sc->sc_clk; 138 1.1.10.2 martin } 139 1.1.10.2 martin 140 1.1.10.2 martin static struct clk * 141 1.1.10.2 martin ti_div_clock_get(void *priv, const char *name) 142 1.1.10.2 martin { 143 1.1.10.2 martin struct ti_div_clock_softc * const sc = priv; 144 1.1.10.2 martin 145 1.1.10.2 martin return &sc->sc_clk; 146 1.1.10.2 martin } 147 1.1.10.2 martin 148 1.1.10.2 martin static void 149 1.1.10.2 martin ti_div_clock_put(void *priv, struct clk *clk) 150 1.1.10.2 martin { 151 1.1.10.2 martin } 152 1.1.10.2 martin 153 1.1.10.2 martin static u_int 154 1.1.10.2 martin ti_div_clock_get_rate(void *priv, struct clk *clk) 155 1.1.10.2 martin { 156 1.1.10.2 martin struct ti_div_clock_softc * const sc = priv; 157 1.1.10.2 martin struct clk *clk_parent = clk_get_parent(clk); 158 1.1.10.2 martin uint64_t parent_rate; 159 1.1.10.2 martin uint32_t val, max_val, mask; 160 1.1.10.2 martin u_int div, max_div, bit_shift; 161 1.1.10.2 martin 162 1.1.10.2 martin if (clk_parent == NULL) 163 1.1.10.2 martin return 0; 164 1.1.10.2 martin 165 1.1.10.2 martin if (of_hasprop(sc->sc_phandle, "ti,index-power-of-two")) 166 1.1.10.2 martin return EINVAL; /* not supported yet */ 167 1.1.10.2 martin 168 1.1.10.2 martin const int start_index = of_hasprop(sc->sc_phandle, "ti,index-starts-at-one") ? 1 : 0; 169 1.1.10.2 martin 170 1.1.10.2 martin if (of_getprop_uint32(sc->sc_phandle, "ti,bit-shift", &bit_shift) != 0) 171 1.1.10.2 martin bit_shift = 0; 172 1.1.10.2 martin 173 1.1.10.2 martin if (of_getprop_uint32(sc->sc_phandle, "ti,max-div", &max_div) == 0) { 174 1.1.10.2 martin max_val = start_index + max_div; 175 1.1.10.2 martin while (!powerof2(max_val)) 176 1.1.10.2 martin max_val++; 177 1.1.10.2 martin mask = (max_val - 1) << bit_shift; 178 1.1.10.2 martin } else { 179 1.1.10.2 martin /* 180 1.1.10.2 martin * The bindings allow for this, but it is not yet supported 181 1.1.10.2 martin * by this driver. 182 1.1.10.2 martin */ 183 1.1.10.2 martin return EINVAL; 184 1.1.10.2 martin } 185 1.1.10.2 martin 186 1.1.10.2 martin val = RD4(sc); 187 1.1.10.2 martin div = __SHIFTOUT(val, mask) + (start_index ? 0 : 1); 188 1.1.10.2 martin if (div == 0) 189 1.1.10.2 martin return EINVAL; 190 1.1.10.2 martin 191 1.1.10.2 martin parent_rate = clk_get_rate(clk_parent); 192 1.1.10.2 martin 193 1.1.10.2 martin return (u_int)(parent_rate / div); 194 1.1.10.2 martin } 195 1.1.10.2 martin 196 1.1.10.2 martin static struct clk * 197 1.1.10.2 martin ti_div_clock_get_parent(void *priv, struct clk *clk) 198 1.1.10.2 martin { 199 1.1.10.2 martin struct ti_div_clock_softc * const sc = priv; 200 1.1.10.2 martin 201 1.1.10.2 martin return fdtbus_clock_get_index(sc->sc_phandle, 0); 202 1.1.10.2 martin } 203
Indexes created Tue Oct 28 07:09:57 GMT 2025