Module Name: src Committed By: jmcneill Date: Fri Nov 25 12:35:45 UTC 2022
Modified Files: src/sys/arch/riscv/conf: GENERIC Added Files: src/sys/arch/riscv/sifive: files.sifive fu540_prci.c Log Message: Add driver for SiFive FU540 PRCI clock controller. To generate a diff of this commit: cvs rdiff -u -r1.20 -r1.21 src/sys/arch/riscv/conf/GENERIC cvs rdiff -u -r0 -r1.1 src/sys/arch/riscv/sifive/files.sifive \ src/sys/arch/riscv/sifive/fu540_prci.c Please note that diffs are not public domain; they are subject to the copyright notices on the relevant files.
Modified files: Index: src/sys/arch/riscv/conf/GENERIC diff -u src/sys/arch/riscv/conf/GENERIC:1.20 src/sys/arch/riscv/conf/GENERIC:1.21 --- src/sys/arch/riscv/conf/GENERIC:1.20 Sat Nov 19 12:10:03 2022 +++ src/sys/arch/riscv/conf/GENERIC Fri Nov 25 12:35:44 2022 @@ -1,4 +1,4 @@ -# $NetBSD: GENERIC,v 1.20 2022/11/19 12:10:03 skrll Exp $ +# $NetBSD: GENERIC,v 1.21 2022/11/25 12:35:44 jmcneill Exp $ # # GENERIC machine description file # @@ -19,10 +19,11 @@ # device. include "arch/riscv/conf/std.riscv64" +include "arch/riscv/sifive/files.sifive" options INCLUDE_CONFIG_FILE # embed config file in kernel binary -#ident "GENERIC-$Revision: 1.20 $" +#ident "GENERIC-$Revision: 1.21 $" maxusers 64 # estimated number of users @@ -155,6 +156,9 @@ config netbsd root on ? type ? mainbus0 at root simplebus* at fdt? pass 0 +# Clock and reset controller +prci* at fdt? # SiFive FU540 PRCI + # UART com* at fdt? # UART Added files: Index: src/sys/arch/riscv/sifive/files.sifive diff -u /dev/null src/sys/arch/riscv/sifive/files.sifive:1.1 --- /dev/null Fri Nov 25 12:35:45 2022 +++ src/sys/arch/riscv/sifive/files.sifive Fri Nov 25 12:35:44 2022 @@ -0,0 +1,10 @@ +# $NetBSD: files.sifive,v 1.1 2022/11/25 12:35:44 jmcneill Exp $ +# +# Configuration info for SiFive SoCs +# +# + +# FU540 Power Reset Clocking Interrupt (PRCI) subsystem +device prci +attach prci at fdt with fu540_prci +file arch/riscv/sifive/fu540_prci.c fu540_prci Index: src/sys/arch/riscv/sifive/fu540_prci.c diff -u /dev/null src/sys/arch/riscv/sifive/fu540_prci.c:1.1 --- /dev/null Fri Nov 25 12:35:45 2022 +++ src/sys/arch/riscv/sifive/fu540_prci.c Fri Nov 25 12:35:44 2022 @@ -0,0 +1,283 @@ +/* $NetBSD: fu540_prci.c,v 1.1 2022/11/25 12:35:44 jmcneill Exp $ */ + +/*- + * Copyright (c) 2022 Jared McNeill <jmcne...@invisible.ca> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS + * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED + * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS + * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +#include <sys/cdefs.h> + +__KERNEL_RCSID(0, "$NetBSD: fu540_prci.c,v 1.1 2022/11/25 12:35:44 jmcneill Exp $"); + +#include <sys/param.h> +#include <sys/bus.h> +#include <sys/device.h> +#include <sys/intr.h> +#include <sys/systm.h> +#include <sys/time.h> +#include <sys/kmem.h> + +#include <dev/clk/clk_backend.h> + +#include <dev/fdt/fdtvar.h> + +#define COREPLLCFG0 0x04 +#define DDRPLLCFG0 0x0c +#define DDRPLLCFG1 0x10 +#define GEMGXLPLLCFG0 0x1c +#define GEMGXLPLLCFG1 0x20 +#define PLL0_DIVQ __BITS(17,15) +#define PLL0_DIVF __BITS(14,6) +#define PLL0_DIVR __BITS(5,0) +#define PLL1_CKE __BIT(24) +#define CORECLKSEL 0x24 + +enum fu540_clkid { + clkid_corepll, + clkid_ddrpll, + clkid_gemgxlpll, + clkid_tlclk, + num_clkid +}; +CTASSERT(num_clkid == 4); + +static int fu540_prci_match(device_t, cfdata_t, void *); +static void fu540_prci_attach(device_t, device_t, void *); + +static u_int fu540_prci_clk_get_rate(void *, struct clk *); + +static const struct device_compatible_entry compat_data[] = { + { .compat = "sifive,fu540-c000-prci" }, + DEVICE_COMPAT_EOL +}; + +struct fu540_prci_softc { + device_t sc_dev; + bus_space_tag_t sc_bst; + bus_space_handle_t sc_bsh; + struct clk_domain sc_clkdom; + struct clk sc_clk[num_clkid]; + + u_int sc_hfclk; + u_int sc_rtcclk; +}; + +#define RD4(sc, reg) \ + bus_space_read_4((sc)->sc_bst, (sc)->sc_bsh, (reg)) +#define WR4(sc, reg, val) \ + bus_space_write_4((sc)->sc_bst, (sc)->sc_bsh, (reg), (val)) + +CFATTACH_DECL_NEW(fu540_prci, sizeof(struct fu540_prci_softc), + fu540_prci_match, fu540_prci_attach, NULL, NULL); + +static struct clk * +fu540_prci_clk_get(void *priv, const char *name) +{ + struct fu540_prci_softc * const sc = priv; + u_int clkid; + + for (clkid = 0; clkid < num_clkid; clkid++) { + if (strcmp(name, sc->sc_clk[clkid].name) == 0) { + return &sc->sc_clk[clkid]; + } + } + + return NULL; +} + +static void +fu540_prci_clk_put(void *priv, struct clk *clk) +{ +} + +static u_int +fu540_prci_clk_get_rate_pll(struct fu540_prci_softc *sc, u_int reg) +{ + uint32_t val; + u_int rate, divr, divf, divq; + + val = RD4(sc, reg); + divr = __SHIFTOUT(val, PLL0_DIVR) + 1; + divf = __SHIFTOUT(val, PLL0_DIVF) + 1; + divq = __SHIFTOUT(val, PLL0_DIVQ); + rate = sc->sc_hfclk * divr * divf; + rate <<= divq; + + return rate; +} + +static u_int +fu540_prci_clk_get_rate(void *priv, struct clk *clk) +{ + struct fu540_prci_softc * const sc = priv; + u_int rate; + + if (clk == &sc->sc_clk[clkid_corepll] || + clk == &sc->sc_clk[clkid_tlclk]) { + rate = fu540_prci_clk_get_rate_pll(sc, COREPLLCFG0); + if (clk == &sc->sc_clk[clkid_tlclk]) { + rate /= 2; + } + return rate; + } else if (clk == &sc->sc_clk[clkid_ddrpll]) { + return fu540_prci_clk_get_rate_pll(sc, DDRPLLCFG0); + } else if (clk == &sc->sc_clk[clkid_gemgxlpll]) { + return fu540_prci_clk_get_rate_pll(sc, GEMGXLPLLCFG0); + } else { + /* Not implemented. */ + return 0; + } +} + +static int +fu540_prci_clk_enable(void *priv, struct clk *clk) +{ + struct fu540_prci_softc * const sc = priv; + uint32_t val; + + if (clk == &sc->sc_clk[clkid_corepll] || + clk == &sc->sc_clk[clkid_tlclk]) { + /* Always enabled. */ + return 0; + } else if (clk == &sc->sc_clk[clkid_ddrpll]) { + val = RD4(sc, DDRPLLCFG1); + WR4(sc, DDRPLLCFG1, val | PLL1_CKE); + return 0; + } else if (clk == &sc->sc_clk[clkid_gemgxlpll]) { + val = RD4(sc, GEMGXLPLLCFG1); + WR4(sc, GEMGXLPLLCFG1, val | PLL1_CKE); + return 0; + } else { + /* Not implemented. */ + return ENXIO; + } +} + +static int +fu540_prci_clk_disable(void *priv, struct clk *clk) +{ + return ENXIO; +} + +static const struct clk_funcs fu540_prci_clk_funcs = { + .get = fu540_prci_clk_get, + .put = fu540_prci_clk_put, + .get_rate = fu540_prci_clk_get_rate, + .enable = fu540_prci_clk_enable, + .disable = fu540_prci_clk_disable, +}; + +static struct clk * +fu540_prci_fdt_decode(device_t dev, int cc_phandle, const void *data, size_t len) +{ + struct fu540_prci_softc * const sc = device_private(dev); + u_int clkid; + + if (len != 4) { + return NULL; + } + + clkid = be32dec(data); + if (clkid >= num_clkid) { + return NULL; + } + + return &sc->sc_clk[clkid]; +} + +static const struct fdtbus_clock_controller_func fu540_prci_fdt_funcs = { + .decode = fu540_prci_fdt_decode +}; + +static int +fu540_prci_match(device_t parent, cfdata_t cf, void *aux) +{ + struct fdt_attach_args * const faa = aux; + + return of_compatible_match(faa->faa_phandle, compat_data); +} + +static void +fu540_prci_attach(device_t parent, device_t self, void *aux) +{ + struct fu540_prci_softc * const sc = device_private(self); + struct fdt_attach_args * const faa = aux; + const int phandle = faa->faa_phandle; + const char *clkname; + struct clk *clk; + bus_addr_t addr; + bus_size_t size; + u_int clkid; + + if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) { + aprint_error(": couldn't get registers\n"); + return; + } + + sc->sc_dev = self; + sc->sc_bst = faa->faa_bst; + if (bus_space_map(sc->sc_bst, addr, size, 0, &sc->sc_bsh) != 0) { + aprint_error(": couldn't map registers\n"); + return; + } + + clk = fdtbus_clock_get(phandle, "hfclk"); + if (clk == NULL) { + aprint_error(": couldn't get hfclk\n"); + return; + } + sc->sc_hfclk = clk_get_rate(clk); + + clk = fdtbus_clock_get(phandle, "rtcclk"); + if (clk == NULL) { + aprint_error(": couldn't get rtcclk\n"); + return; + } + sc->sc_rtcclk = clk_get_rate(clk); + + sc->sc_clkdom.name = device_xname(self); + sc->sc_clkdom.funcs = &fu540_prci_clk_funcs; + sc->sc_clkdom.priv = sc; + for (clkid = 0; clkid < num_clkid; clkid++) { + clkname = fdtbus_get_string_index(phandle, + "clock-output-names", clkid); + sc->sc_clk[clkid].domain = &sc->sc_clkdom; + if (clkname != NULL) { + sc->sc_clk[clkid].name = kmem_asprintf("%s", clkname); + } + clk_attach(&sc->sc_clk[clkid]); + } + + aprint_naive("\n"); + aprint_normal(": FU540 PRCI (HF %u Hz, RTC %u Hz)\n", + sc->sc_hfclk, sc->sc_rtcclk); + + for (clkid = 0; clkid < num_clkid; clkid++) { + aprint_debug_dev(self, "clkid %u [%s]: %u Hz\n", clkid, + sc->sc_clk[clkid].name ? sc->sc_clk[clkid].name : "<none>", + clk_get_rate(&sc->sc_clk[clkid])); + } + + fdtbus_register_clock_controller(self, phandle, &fu540_prci_fdt_funcs); +}