/*- * SPDX-License-Identifier: BSD-2-Clause * * Copyright 2020 Michal Meloun * * 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 #include #include #include #include #include #include #include #include #include #include "tegra210_car.h" struct super_mux_def { struct clknode_init_def clkdef; uint32_t base_reg; uint32_t flags; }; #define PLIST(x) static const char *x[] #define SM(_id, cn, pl, r) \ { \ .clkdef.id = _id, \ .clkdef.name = cn, \ .clkdef.parent_names = pl, \ .clkdef.parent_cnt = nitems(pl), \ .clkdef.flags = CLK_NODE_STATIC_STRINGS, \ .base_reg = r, \ } PLIST(cclk_g_parents) = { "clk_m", NULL, "clk_s", NULL, "pllP_out0", "pllP_out4", NULL, NULL, "pllX_out0", "dfllCPU_out_alias", NULL, NULL, NULL, NULL, "pllX_out0_alias", "dfllCPU_out", }; PLIST(cclk_lp_parents) = { "clk_m", NULL, "clk_s", NULL, "pllP_out0", "pllP_out4", NULL, NULL, "pllX_out0", "dfllCPU_out_alias", NULL, NULL, NULL, NULL, "pllX_out0_alias", "dfllCPU_out", }; PLIST(sclk_parents) = { "clk_m", "pllC_out1", "pllC4_out3", "pllP_out0", "pllP_out2", "pllC4_out1", "clk_s", "pllC4_out1", }; static struct super_mux_def super_mux_def[] = { SM(TEGRA210_CLK_CCLK_G, "cclk_g", cclk_g_parents, CCLKG_BURST_POLICY), SM(TEGRA210_CLK_CCLK_LP, "cclk_lp", cclk_lp_parents, CCLKLP_BURST_POLICY), SM(TEGRA210_CLK_SCLK, "sclk", sclk_parents, SCLK_BURST_POLICY), }; static int super_mux_init(struct clknode *clk, device_t dev); static int super_mux_set_mux(struct clknode *clk, int idx); struct super_mux_sc { device_t clkdev; uint32_t base_reg; uint32_t flags; int mux; }; static clknode_method_t super_mux_methods[] = { /* Device interface */ CLKNODEMETHOD(clknode_init, super_mux_init), CLKNODEMETHOD(clknode_set_mux, super_mux_set_mux), CLKNODEMETHOD_END }; DEFINE_CLASS_1(tegra210_super_mux, tegra210_super_mux_class, super_mux_methods, sizeof(struct super_mux_sc), clknode_class); /* Mux status. */ #define SUPER_MUX_STATE_STDBY 0 #define SUPER_MUX_STATE_IDLE 1 #define SUPER_MUX_STATE_RUN 2 #define SUPER_MUX_STATE_IRQ 3 #define SUPER_MUX_STATE_FIQ 4 /* Mux register bits. */ #define SUPER_MUX_STATE_BIT_SHIFT 28 #define SUPER_MUX_STATE_BIT_MASK 0xF /* State is Priority encoded */ #define SUPER_MUX_STATE_BIT_STDBY 0x00 #define SUPER_MUX_STATE_BIT_IDLE 0x01 #define SUPER_MUX_STATE_BIT_RUN 0x02 #define SUPER_MUX_STATE_BIT_IRQ 0x04 #define SUPER_MUX_STATE_BIT_FIQ 0x08 #define SUPER_MUX_MUX_WIDTH 4 static uint32_t super_mux_get_state(uint32_t reg) { reg = (reg >> SUPER_MUX_STATE_BIT_SHIFT) & SUPER_MUX_STATE_BIT_MASK; if (reg & SUPER_MUX_STATE_BIT_FIQ) return (SUPER_MUX_STATE_FIQ); if (reg & SUPER_MUX_STATE_BIT_IRQ) return (SUPER_MUX_STATE_IRQ); if (reg & SUPER_MUX_STATE_BIT_RUN) return (SUPER_MUX_STATE_RUN); if (reg & SUPER_MUX_STATE_BIT_IDLE) return (SUPER_MUX_STATE_IDLE); return (SUPER_MUX_STATE_STDBY); } static int super_mux_init(struct clknode *clk, device_t dev) { struct super_mux_sc *sc; uint32_t reg; int shift, state; sc = clknode_get_softc(clk); DEVICE_LOCK(sc); RD4(sc, sc->base_reg, ®); DEVICE_UNLOCK(sc); state = super_mux_get_state(reg); if ((state != SUPER_MUX_STATE_RUN) && (state != SUPER_MUX_STATE_IDLE)) { panic("Unexpected super mux state: %u", state); } shift = state * SUPER_MUX_MUX_WIDTH; sc->mux = (reg >> shift) & ((1 << SUPER_MUX_MUX_WIDTH) - 1); clknode_init_parent_idx(clk, sc->mux); return(0); } static int super_mux_set_mux(struct clknode *clk, int idx) { struct super_mux_sc *sc; int shift, state; uint32_t reg, dummy; sc = clknode_get_softc(clk); DEVICE_LOCK(sc); RD4(sc, sc->base_reg, ®); state = super_mux_get_state(reg); if ((state != SUPER_MUX_STATE_RUN) && (state != SUPER_MUX_STATE_IDLE)) { panic("Unexpected super mux state: %u", state); } shift = (state - 1) * SUPER_MUX_MUX_WIDTH; sc->mux = idx; reg &= ~(((1 << SUPER_MUX_MUX_WIDTH) - 1) << shift); reg |= idx << shift; WR4(sc, sc->base_reg, reg); RD4(sc, sc->base_reg, &dummy); DEVICE_UNLOCK(sc); return(0); } static int super_mux_register(struct clkdom *clkdom, struct super_mux_def *clkdef) { struct clknode *clk; struct super_mux_sc *sc; clk = clknode_create(clkdom, &tegra210_super_mux_class, &clkdef->clkdef); if (clk == NULL) return (1); sc = clknode_get_softc(clk); sc->clkdev = clknode_get_device(clk); sc->base_reg = clkdef->base_reg; sc->flags = clkdef->flags; clknode_register(clkdom, clk); return (0); } void tegra210_super_mux_clock(struct tegra210_car_softc *sc) { int i, rv; for (i = 0; i < nitems(super_mux_def); i++) { rv = super_mux_register(sc->clkdom, &super_mux_def[i]); if (rv != 0) panic("super_mux_register failed"); } }