diff options
Diffstat (limited to 'sys/arm64/qoriq/clk/qoriq_clk_pll.c')
| -rw-r--r-- | sys/arm64/qoriq/clk/qoriq_clk_pll.c | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/sys/arm64/qoriq/clk/qoriq_clk_pll.c b/sys/arm64/qoriq/clk/qoriq_clk_pll.c new file mode 100644 index 000000000000..813bc76c3349 --- /dev/null +++ b/sys/arm64/qoriq/clk/qoriq_clk_pll.c @@ -0,0 +1,152 @@ +/*- + * SPDX-License-Identifier: BSD-2-Clause-FreeBSD + * + * Copyright (c) 2020 Alstom Group. + * Copyright (c) 2020 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/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/bus.h> + +#include <dev/extres/clk/clk.h> +#include <dev/extres/clk/clk_fixed.h> + +#include <arm64/qoriq/clk/qoriq_clkgen.h> + +#include "clkdev_if.h" + +struct qoriq_clk_pll_softc { + bus_addr_t offset; + + uint32_t mask; + uint32_t shift; + + uint32_t flags; +}; + +#define WR4(_clk, offset, val) \ + CLKDEV_WRITE_4(clknode_get_device(_clk), offset, val) +#define RD4(_clk, offset, val) \ + CLKDEV_READ_4(clknode_get_device(_clk), offset, val) +#define DEVICE_LOCK(_clk) \ + CLKDEV_DEVICE_LOCK(clknode_get_device(_clk)) +#define DEVICE_UNLOCK(_clk) \ + CLKDEV_DEVICE_UNLOCK(clknode_get_device(_clk)) + +#define QORIQ_PLL_KILL_BIT (1 << 31) + +static int +qoriq_clk_pll_init(struct clknode *clk, device_t dev) +{ + + clknode_init_parent_idx(clk, 0); + + return (0); +} + +static int +qoriq_clk_pll_recalc_freq(struct clknode *clk, uint64_t *freq) +{ + struct qoriq_clk_pll_softc *sc; + uint32_t mul; + + sc = clknode_get_softc(clk); + + RD4(clk, sc->offset, &mul); + + if (sc->flags & QORIQ_CLK_PLL_HAS_KILL_BIT && mul & QORIQ_PLL_KILL_BIT) + return (0); + + mul &= sc->mask; + mul >>= sc->shift; + + *freq = *freq * mul; + + return (0); +} + +static clknode_method_t qoriq_clk_pll_clknode_methods[] = { + CLKNODEMETHOD(clknode_init, qoriq_clk_pll_init), + CLKNODEMETHOD(clknode_recalc_freq, qoriq_clk_pll_recalc_freq), + + CLKNODEMETHOD_END +}; + +DEFINE_CLASS_1(qoriq_clk_pll_clknode, qoriq_clk_pll_clknode_class, + qoriq_clk_pll_clknode_methods, sizeof(struct qoriq_clk_pll_softc), + clknode_class); + +int +qoriq_clk_pll_register(struct clkdom *clkdom, + const struct qoriq_clk_pll_def *clkdef) +{ + char namebuf[QORIQ_CLK_NAME_MAX_LEN]; + struct qoriq_clk_pll_softc *sc; + struct clk_fixed_def def; + const char *parent_name; + struct clknode *clk; + int error; + int i; + + clk = clknode_create(clkdom, &qoriq_clk_pll_clknode_class, + &clkdef->clkdef); + if (clk == NULL) + return (1); + + sc = clknode_get_softc(clk); + sc->mask = clkdef->mask; + sc->shift = clkdef->shift; + sc->flags = clkdef->flags; + sc->offset = clkdef->offset; + + clknode_register(clkdom, clk); + + parent_name = clkdef->clkdef.name; + + def.clkdef.parent_names = &parent_name; + def.clkdef.parent_cnt = 1; + def.clkdef.name = namebuf; + def.mult = 1; + def.freq = 0; + + i = 0; + while (clkdef->dividers[i] != 0) { + def.div = clkdef->dividers[i]; + def.clkdef.id = clkdef->clkdef.id + i; + snprintf(namebuf, QORIQ_CLK_NAME_MAX_LEN, "%s_div%d", + parent_name, clkdef->dividers[i]); + + error = clknode_fixed_register(clkdom, &def); + if (error != 0) + return (error); + + i++; + } + + return (0); +} |