1/* $NetBSD: bcm2835_cprman.c,v 1.5 2021/01/27 03:10:19 thorpej Exp $ */ 2 3/*- 4 * Copyright (c) 2017 Jared D. 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: bcm2835_cprman.c,v 1.5 2021/01/27 03:10:19 thorpej 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#include <arm/broadcom/bcm2835var.h> 43 44enum { 45 CPRMAN_CLOCK_TIMER = 17, 46 CPRMAN_CLOCK_UART = 19, 47 CPRMAN_CLOCK_VPU = 20, 48 CPRMAN_CLOCK_V3D = 21, 49 CPRMAN_CLOCK_ISP = 22, 50 CPRMAN_CLOCK_H264 = 23, 51 CPRMAN_CLOCK_VEC = 24, 52 CPRMAN_CLOCK_HSM = 25, 53 CPRMAN_CLOCK_SDRAM = 26, 54 CPRMAN_CLOCK_TSENS = 27, 55 CPRMAN_CLOCK_EMMC = 28, 56 CPRMAN_CLOCK_PERIIMAGE = 29, 57 CPRMAN_CLOCK_PWM = 30, 58 CPRMAN_CLOCK_PCM = 31, 59 CPRMAN_CLOCK_EMMC2 = 51, 60 CPRMAN_NCLOCK 61}; 62 63struct cprman_clk { 64 struct clk base; 65 u_int id; 66}; 67 68struct cprman_softc { 69 device_t sc_dev; 70 int sc_phandle; 71 72 struct clk_domain sc_clkdom; 73 struct cprman_clk sc_clk[CPRMAN_NCLOCK]; 74}; 75 76 77static struct clk * 78cprman_decode(device_t dev, int cc_phandle, const void *data, size_t len) 79{ 80 struct cprman_softc * const sc = device_private(dev); 81 struct cprman_clk *clk; 82 const u_int *spec = data; 83 u_int id; 84 85 if (len != 4) 86 return NULL; 87 88 id = be32toh(spec[0]); 89 90 if (id >= CPRMAN_NCLOCK) 91 return NULL; 92 clk = &sc->sc_clk[id]; 93 if (clk->base.name == NULL) 94 return NULL; 95 96 return &clk->base; 97} 98 99static const struct fdtbus_clock_controller_func cprman_fdt_funcs = { 100 .decode = cprman_decode 101}; 102 103static struct clk * 104cprman_get(void *priv, const char *name) 105{ 106 struct cprman_softc * const sc = priv; 107 u_int n; 108 109 for (n = 0; n < __arraycount(sc->sc_clk); n++) { 110 if (sc->sc_clk[n].base.name == NULL) 111 continue; 112 if (strcmp(sc->sc_clk[n].base.name, name) == 0) 113 return &sc->sc_clk[n].base; 114 } 115 116 return NULL; 117} 118 119static void 120cprman_put(void *priv, struct clk *clk) 121{ 122} 123 124static u_int 125cprman_get_rate(void *priv, struct clk *baseclk) 126{ 127 //struct cprman_softc * const sc = priv; 128 struct cprman_clk *clk = container_of(baseclk, struct cprman_clk, base); 129 130 switch (clk->id) { 131 case CPRMAN_CLOCK_UART: 132 return bcm283x_clk_get_rate_uart(); 133 case CPRMAN_CLOCK_VPU: 134 return bcm283x_clk_get_rate_vpu(); 135 case CPRMAN_CLOCK_EMMC: 136 return bcm283x_clk_get_rate_emmc(); 137 case CPRMAN_CLOCK_EMMC2: 138 return bcm283x_clk_get_rate_emmc2(); 139 default: 140 panic("unsupported clock id %d\n", clk->id); 141 } 142} 143 144static const struct clk_funcs cprman_clk_funcs = { 145 .get = cprman_get, 146 .put = cprman_put, 147 .get_rate = cprman_get_rate, 148}; 149 150static void 151cprman_add_clock(struct cprman_softc *sc, u_int id, const char *name) 152{ 153 sc->sc_clk[id].base.domain = &sc->sc_clkdom; 154 sc->sc_clk[id].base.name = name; 155 sc->sc_clk[id].id = id; 156} 157 158static const struct device_compatible_entry compat_data[] = { 159 { .compat = "brcm,bcm2835-cprman" }, 160 { .compat = "brcm,bcm2711-cprman" }, 161 DEVICE_COMPAT_EOL 162}; 163 164static int 165cprman_match(device_t parent, cfdata_t cf, void *aux) 166{ 167 const struct fdt_attach_args *faa = aux; 168 169 return of_compatible_match(faa->faa_phandle, compat_data); 170} 171 172static void 173cprman_attach(device_t parent, device_t self, void *aux) 174{ 175 struct cprman_softc * const sc = device_private(self); 176 const struct fdt_attach_args *faa = aux; 177 const int phandle = faa->faa_phandle; 178 179 sc->sc_dev = self; 180 sc->sc_phandle = phandle; 181 sc->sc_clkdom.funcs = &cprman_clk_funcs; 182 sc->sc_clkdom.priv = sc; 183 184 cprman_add_clock(sc, CPRMAN_CLOCK_UART, "uart"); 185 cprman_add_clock(sc, CPRMAN_CLOCK_VPU, "vpu"); 186 cprman_add_clock(sc, CPRMAN_CLOCK_EMMC, "emmc"); 187 cprman_add_clock(sc, CPRMAN_CLOCK_EMMC2, "emmc2"); 188 189 aprint_naive("\n"); 190 aprint_normal(": BCM283x Clock Controller\n"); 191 192 fdtbus_register_clock_controller(self, phandle, &cprman_fdt_funcs); 193} 194 195CFATTACH_DECL_NEW(bcmcprman_fdt, sizeof(struct cprman_softc), 196 cprman_match, cprman_attach, NULL, NULL); 197