diff options
Diffstat (limited to 'sys/arm/mv/clk/a37x0_tbg.c')
| -rw-r--r-- | sys/arm/mv/clk/a37x0_tbg.c | 221 |
1 files changed, 221 insertions, 0 deletions
diff --git a/sys/arm/mv/clk/a37x0_tbg.c b/sys/arm/mv/clk/a37x0_tbg.c new file mode 100644 index 000000000000..32ec1c83b102 --- /dev/null +++ b/sys/arm/mv/clk/a37x0_tbg.c @@ -0,0 +1,221 @@ +/*- + * SPDX-License-Identifier: BSD-2-Clause + * + * Copyright (c) 2021 Semihalf. + * + * 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 AUTHOR 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 AUTHOR 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/param.h> +#include <sys/bus.h> +#include <sys/kernel.h> +#include <sys/module.h> +#include <sys/rman.h> +#include <machine/bus.h> + +#include <dev/clk/clk.h> +#include <dev/ofw/ofw_bus_subr.h> + +#include "clkdev_if.h" + +#include "a37x0_tbg_pll.h" + +#define NUM_TBG 4 + +#define TBG_CTRL0 0x4 +#define TBG_CTRL1 0x8 +#define TBG_CTRL7 0x20 +#define TBG_CTRL8 0x30 + +#define TBG_MASK 0x1FF + +#define TBG_A_REFDIV 0 +#define TBG_B_REFDIV 16 + +#define TBG_A_FBDIV 2 +#define TBG_B_FBDIV 18 + +#define TBG_A_VCODIV_SEL 0 +#define TBG_B_VCODIV_SEL 16 + +#define TBG_A_VCODIV_DIFF 1 +#define TBG_B_VCODIV_DIFF 17 + +struct a37x0_tbg_softc { + device_t dev; + struct clkdom *clkdom; + struct resource *res; +}; + +static struct resource_spec a37x0_tbg_clk_spec[] = { + { SYS_RES_MEMORY, 0, RF_ACTIVE }, + { -1, 0 } +}; + +struct a37x0_tbg_def { + char *name; + uint32_t refdiv_shift; + uint32_t fbdiv_shift; + uint32_t vcodiv_offset; + uint32_t vcodiv_shift; + uint32_t tbg_bypass_en; +}; + +static const struct a37x0_tbg_def tbg[NUM_TBG] = { + {"TBG-A-P", TBG_A_REFDIV, TBG_A_FBDIV, TBG_CTRL8, TBG_A_VCODIV_DIFF, 9}, + {"TBG-B-P", TBG_B_REFDIV, TBG_B_FBDIV, TBG_CTRL8, + TBG_B_VCODIV_DIFF, 25}, + {"TBG-A-S", TBG_A_REFDIV, TBG_A_FBDIV, TBG_CTRL1, TBG_A_VCODIV_SEL, 9}, + {"TBG-B-S", TBG_B_REFDIV, TBG_B_FBDIV, TBG_CTRL1, TBG_B_VCODIV_SEL, 25} +}; + +static int a37x0_tbg_read_4(device_t, bus_addr_t, uint32_t *); +static int a37x0_tbg_attach(device_t); +static int a37x0_tbg_detach(device_t); +static int a37x0_tbg_probe(device_t); + +static device_method_t a37x0_tbg_methods [] = { + DEVMETHOD(device_attach, a37x0_tbg_attach), + DEVMETHOD(device_detach, a37x0_tbg_detach), + DEVMETHOD(device_probe, a37x0_tbg_probe), + + DEVMETHOD(clkdev_read_4, a37x0_tbg_read_4), + + DEVMETHOD_END +}; + +static driver_t a37x0_tbg_driver = { + "a37x0_tbg", + a37x0_tbg_methods, + sizeof(struct a37x0_tbg_softc) +}; + +EARLY_DRIVER_MODULE(a37x0_tbg, simplebus, a37x0_tbg_driver, 0, 0, + BUS_PASS_TIMER + BUS_PASS_ORDER_MIDDLE); + +static int +a37x0_tbg_read_4(device_t dev, bus_addr_t offset, uint32_t *val) +{ + struct a37x0_tbg_softc *sc; + + sc = device_get_softc(dev); + + *val = bus_read_4(sc->res, offset); + + return (0); +} + +static int +a37x0_tbg_attach(device_t dev) +{ + struct a37x0_tbg_pll_clk_def def; + struct a37x0_tbg_softc *sc; + const char *clkname; + int error, i; + phandle_t node; + clk_t clock; + + sc = device_get_softc(dev); + node = ofw_bus_get_node(dev); + sc->dev = dev; + + if (bus_alloc_resources(dev, a37x0_tbg_clk_spec, &sc->res) != 0) { + device_printf(dev, "Cannot allocate resources\n"); + return (ENXIO); + } + + sc->clkdom = clkdom_create(dev); + if (sc->clkdom == NULL) { + device_printf(dev, "Cannot create clock domain.\n"); + return (ENXIO); + } + + error = clk_get_by_ofw_index(dev, node, 0, &clock); + if (error != 0) { + device_printf(dev, "Cannot find clock parent\n"); + bus_release_resources(dev, a37x0_tbg_clk_spec, &sc->res); + return (error); + } + + clkname = clk_get_name(clock); + + for (i = 0; i < NUM_TBG; i++) { + def.clkdef.parent_names = &clkname; + def.clkdef.parent_cnt = 1; + def.clkdef.id = i; + def.clkdef.name = tbg[i].name; + + def.vcodiv.offset = tbg[i].vcodiv_offset; + def.vcodiv.shift = tbg[i].vcodiv_shift; + def.refdiv.offset = TBG_CTRL7; + def.refdiv.shift = tbg[i].refdiv_shift; + def.fbdiv.offset = TBG_CTRL0; + def.fbdiv.shift = tbg[i].fbdiv_shift; + def.vcodiv.mask = def.refdiv.mask = def.fbdiv.mask = TBG_MASK; + def.tbg_bypass.offset = TBG_CTRL1; + def.tbg_bypass.shift = tbg[i].tbg_bypass_en; + def.tbg_bypass.mask = 0x1; + + error = a37x0_tbg_pll_clk_register(sc->clkdom, &def); + + if (error) { + device_printf(dev, "Cannot register clock node\n"); + bus_release_resources(dev, a37x0_tbg_clk_spec, + &sc->res); + return (ENXIO); + } + } + + error = clkdom_finit(sc->clkdom); + if (error) { + device_printf(dev, + "Cannot finalize clock domain intialization\n"); + bus_release_resources(dev, a37x0_tbg_clk_spec, &sc->res); + return (ENXIO); + } + + if (bootverbose) + clkdom_dump(sc->clkdom); + + return (0); +} + +static int +a37x0_tbg_probe(device_t dev) +{ + + if (!ofw_bus_status_okay(dev)) + return (ENXIO); + + if (!ofw_bus_is_compatible(dev, "marvell,armada-3700-tbg-clock")) + return (ENXIO); + + device_set_desc(dev, "Marvell Armada 3700 time base generators"); + return (BUS_PROBE_DEFAULT); +} + +static int +a37x0_tbg_detach(device_t dev) +{ + + return (EBUSY); +} |