diff options
Diffstat (limited to 'sys/arm/allwinner/clkng/aw_clk_np.c')
-rw-r--r-- | sys/arm/allwinner/clkng/aw_clk_np.c | 267 |
1 files changed, 267 insertions, 0 deletions
diff --git a/sys/arm/allwinner/clkng/aw_clk_np.c b/sys/arm/allwinner/clkng/aw_clk_np.c new file mode 100644 index 000000000000..6403b52a9abe --- /dev/null +++ b/sys/arm/allwinner/clkng/aw_clk_np.c @@ -0,0 +1,267 @@ +/*- + * SPDX-License-Identifier: BSD-2-Clause-FreeBSD + * + * Copyright (c) 2019 Emmanuel Vadot <manu@freebsd.org> + * + * 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 ``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 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. + * + * $FreeBSD$ + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/bus.h> + +#include <dev/extres/clk/clk.h> + +#include <arm/allwinner/clkng/aw_clk.h> +#include <arm/allwinner/clkng/aw_clk_np.h> + +#include "clkdev_if.h" + +/* + * clknode for clocks matching the formula : + * + * clk = clkin * n / p + * + */ + +struct aw_clk_np_sc { + uint32_t offset; + + struct aw_clk_factor n; + struct aw_clk_factor p; + + uint32_t gate_shift; + uint32_t lock_shift; + uint32_t lock_retries; + + uint32_t flags; +}; + +#define WRITE4(_clk, off, val) \ + CLKDEV_WRITE_4(clknode_get_device(_clk), off, val) +#define READ4(_clk, off, val) \ + CLKDEV_READ_4(clknode_get_device(_clk), off, val) +#define DEVICE_LOCK(_clk) \ + CLKDEV_DEVICE_LOCK(clknode_get_device(_clk)) +#define DEVICE_UNLOCK(_clk) \ + CLKDEV_DEVICE_UNLOCK(clknode_get_device(_clk)) + +static int +aw_clk_np_init(struct clknode *clk, device_t dev) +{ + struct aw_clk_np_sc *sc; + + sc = clknode_get_softc(clk); + + clknode_init_parent_idx(clk, 0); + return (0); +} + +static int +aw_clk_np_set_gate(struct clknode *clk, bool enable) +{ + struct aw_clk_np_sc *sc; + uint32_t val; + + sc = clknode_get_softc(clk); + + if ((sc->flags & AW_CLK_HAS_GATE) == 0) + return (0); + + DEVICE_LOCK(clk); + READ4(clk, sc->offset, &val); + if (enable) + val |= (1 << sc->gate_shift); + else + val &= ~(1 << sc->gate_shift); + WRITE4(clk, sc->offset, val); + DEVICE_UNLOCK(clk); + + return (0); +} + +static uint64_t +aw_clk_np_find_best(struct aw_clk_np_sc *sc, uint64_t fparent, uint64_t *fout, + uint32_t *factor_n, uint32_t *factor_p) +{ + uint64_t cur, best; + uint32_t n, p, max_n, max_p, min_n, min_p; + + *factor_n = *factor_p = 0; + + max_n = aw_clk_factor_get_max(&sc->n); + max_p = aw_clk_factor_get_max(&sc->p); + min_n = aw_clk_factor_get_min(&sc->n); + min_p = aw_clk_factor_get_min(&sc->p); + + for (p = min_p; p <= max_p; ) { + for (n = min_n; n <= max_n; ) { + cur = fparent * n / p; + if (abs(*fout - cur) < abs(*fout - best)) { + best = cur; + *factor_n = n; + *factor_p = p; + } + + n++; + } + p++; + } + + return (best); +} + +static int +aw_clk_np_set_freq(struct clknode *clk, uint64_t fparent, uint64_t *fout, + int flags, int *stop) +{ + struct aw_clk_np_sc *sc; + uint64_t cur, best; + uint32_t val, n, p, best_n, best_p; + int retry; + + sc = clknode_get_softc(clk); + + best = cur = 0; + + best = aw_clk_np_find_best(sc, fparent, fout, + &best_n, &best_p); + + if ((flags & CLK_SET_DRYRUN) != 0) { + *fout = best; + *stop = 1; + return (0); + } + + if ((best < *fout) && + ((flags & CLK_SET_ROUND_DOWN) == 0)) { + *stop = 1; + return (ERANGE); + } + if ((best > *fout) && + ((flags & CLK_SET_ROUND_UP) == 0)) { + *stop = 1; + return (ERANGE); + } + + DEVICE_LOCK(clk); + READ4(clk, sc->offset, &val); + + n = aw_clk_factor_get_value(&sc->n, best_n); + p = aw_clk_factor_get_value(&sc->p, best_p); + val &= ~sc->n.mask; + val &= ~sc->p.mask; + val |= n << sc->n.shift; + val |= p << sc->p.shift; + + WRITE4(clk, sc->offset, val); + DEVICE_UNLOCK(clk); + + if ((sc->flags & AW_CLK_HAS_LOCK) != 0) { + for (retry = 0; retry < sc->lock_retries; retry++) { + READ4(clk, sc->offset, &val); + if ((val & (1 << sc->lock_shift)) != 0) + break; + DELAY(1000); + } + } + + *fout = best; + *stop = 1; + + return (0); +} + +static int +aw_clk_np_recalc(struct clknode *clk, uint64_t *freq) +{ + struct aw_clk_np_sc *sc; + uint32_t val, n, p; + + sc = clknode_get_softc(clk); + + DEVICE_LOCK(clk); + READ4(clk, sc->offset, &val); + DEVICE_UNLOCK(clk); + + n = aw_clk_get_factor(val, &sc->n); + p = aw_clk_get_factor(val, &sc->p); + + *freq = *freq * n / p; + + return (0); +} + +static clknode_method_t aw_np_clknode_methods[] = { + /* Device interface */ + CLKNODEMETHOD(clknode_init, aw_clk_np_init), + CLKNODEMETHOD(clknode_set_gate, aw_clk_np_set_gate), + CLKNODEMETHOD(clknode_recalc_freq, aw_clk_np_recalc), + CLKNODEMETHOD(clknode_set_freq, aw_clk_np_set_freq), + CLKNODEMETHOD_END +}; + +DEFINE_CLASS_1(aw_np_clknode, aw_np_clknode_class, aw_np_clknode_methods, + sizeof(struct aw_clk_np_sc), clknode_class); + +int +aw_clk_np_register(struct clkdom *clkdom, struct aw_clk_np_def *clkdef) +{ + struct clknode *clk; + struct aw_clk_np_sc *sc; + + clk = clknode_create(clkdom, &aw_np_clknode_class, &clkdef->clkdef); + if (clk == NULL) + return (1); + + sc = clknode_get_softc(clk); + + sc->offset = clkdef->offset; + + sc->n.shift = clkdef->n.shift; + sc->n.width = clkdef->n.width; + sc->n.mask = ((1 << sc->n.width) - 1) << sc->n.shift; + sc->n.value = clkdef->n.value; + sc->n.flags = clkdef->n.flags; + + sc->p.shift = clkdef->p.shift; + sc->p.width = clkdef->p.width; + sc->p.mask = ((1 << sc->p.width) - 1) << sc->p.shift; + sc->p.value = clkdef->p.value; + sc->p.flags = clkdef->p.flags; + + sc->gate_shift = clkdef->gate_shift; + + sc->lock_shift = clkdef->lock_shift; + sc->lock_retries = clkdef->lock_retries; + + sc->flags = clkdef->flags; + + clknode_register(clkdom, clk); + + return (0); +} |