475 lines
13 KiB
C
475 lines
13 KiB
C
/* $NetBSD: imx51_ccm.c,v 1.1 2012/04/17 09:33:31 bsh Exp $ */
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/*
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* Copyright (c) 2010, 2011, 2012 Genetec Corporation. All rights reserved.
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* Written by Hashimoto Kenichi for Genetec Corporation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY GENETEC CORPORATION ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GENETEC CORPORATION
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*-
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* Copyright (c) 2012 The FreeBSD Foundation
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* All rights reserved.
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*
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* Portions of this software were developed by Oleksandr Rybalko
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* under sponsorship from the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Clock Controller Module (CCM)
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/malloc.h>
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#include <sys/rman.h>
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#include <machine/bus.h>
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#include <machine/cpu.h>
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#include <machine/intr.h>
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#include <dev/fdt/fdt_common.h>
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#include <dev/ofw/openfirm.h>
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#include <dev/ofw/ofw_bus.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#include <machine/bus.h>
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#include <machine/fdt.h>
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#include <arm/freescale/imx/imx51_ccmvar.h>
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#include <arm/freescale/imx/imx51_ccmreg.h>
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#include <arm/freescale/imx/imx51_dpllreg.h>
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#define IMXCCMDEBUG
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#undef IMXCCMDEBUG
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#ifndef IMX51_OSC_FREQ
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#define IMX51_OSC_FREQ (24 * 1000 * 1000) /* 24MHz */
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#endif
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#ifndef IMX51_CKIL_FREQ
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#define IMX51_CKIL_FREQ 32768
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#endif
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struct imxccm_softc {
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device_t sc_dev;
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struct resource *res[7];
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u_int64_t pll_freq[IMX51_N_DPLLS];
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};
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struct imxccm_softc *ccm_softc = NULL;
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static uint64_t imx51_get_pll_freq(u_int);
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static int imxccm_match(device_t);
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static int imxccm_attach(device_t);
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static device_method_t imxccm_methods[] = {
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DEVMETHOD(device_probe, imxccm_match),
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DEVMETHOD(device_attach, imxccm_attach),
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DEVMETHOD_END
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};
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static driver_t imxccm_driver = {
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"imxccm",
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imxccm_methods,
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sizeof(struct imxccm_softc),
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};
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static devclass_t imxccm_devclass;
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EARLY_DRIVER_MODULE(imxccm, simplebus, imxccm_driver, imxccm_devclass, 0, 0,
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BUS_PASS_CPU);
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static struct resource_spec imxccm_spec[] = {
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{ SYS_RES_MEMORY, 0, RF_ACTIVE }, /* Global registers */
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{ SYS_RES_MEMORY, 1, RF_ACTIVE }, /* DPLLIP1 */
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{ SYS_RES_MEMORY, 2, RF_ACTIVE }, /* DPLLIP2 */
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{ SYS_RES_MEMORY, 3, RF_ACTIVE }, /* DPLLIP3 */
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{ SYS_RES_IRQ, 0, RF_ACTIVE }, /* 71 */
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{ SYS_RES_IRQ, 1, RF_ACTIVE }, /* 72 */
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{ -1, 0 }
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};
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static int
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imxccm_match(device_t dev)
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{
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if (!ofw_bus_is_compatible(dev, "fsl,imx51-ccm"))
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return (ENXIO);
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device_set_desc(dev, "Freescale Clock Control Module");
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return (BUS_PROBE_DEFAULT);
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}
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static int
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imxccm_attach(device_t dev)
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{
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struct imxccm_softc *sc;
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sc = device_get_softc(dev);
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sc->sc_dev = dev;
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if (bus_alloc_resources(dev, imxccm_spec, sc->res)) {
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device_printf(dev, "could not allocate resources\n");
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return (ENXIO);
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}
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ccm_softc = sc;
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imx51_get_pll_freq(1);
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imx51_get_pll_freq(2);
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imx51_get_pll_freq(3);
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device_printf(dev, "PLL1=%lluMHz, PLL2=%lluMHz, PLL3=%lluMHz\n",
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sc->pll_freq[0] / 1000000,
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sc->pll_freq[1] / 1000000,
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sc->pll_freq[2] / 1000000);
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device_printf(dev, "CPU clock=%d, UART clock=%d\n",
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imx51_get_clock(IMX51CLK_ARM_ROOT),
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imx51_get_clock(IMX51CLK_UART_CLK_ROOT));
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device_printf(dev,
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"mainbus clock=%d, ahb clock=%d ipg clock=%d perclk=%d\n",
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imx51_get_clock(IMX51CLK_MAIN_BUS_CLK),
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imx51_get_clock(IMX51CLK_AHB_CLK_ROOT),
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imx51_get_clock(IMX51CLK_IPG_CLK_ROOT),
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imx51_get_clock(IMX51CLK_PERCLK_ROOT));
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return (0);
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}
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u_int
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imx51_get_clock(enum imx51_clock clk)
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{
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u_int freq;
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u_int sel;
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uint32_t cacrr; /* ARM clock root register */
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uint32_t ccsr;
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uint32_t cscdr1;
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uint32_t cscmr1;
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uint32_t cbcdr;
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uint32_t cbcmr;
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uint32_t cdcr;
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if (ccm_softc == NULL)
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return (0);
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switch (clk) {
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case IMX51CLK_PLL1:
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case IMX51CLK_PLL2:
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case IMX51CLK_PLL3:
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return ccm_softc->pll_freq[clk-IMX51CLK_PLL1];
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case IMX51CLK_PLL1SW:
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ccsr = bus_read_4(ccm_softc->res[0], CCMC_CCSR);
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if ((ccsr & CCSR_PLL1_SW_CLK_SEL) == 0)
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return ccm_softc->pll_freq[1-1];
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/* step clock */
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/* FALLTHROUGH */
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case IMX51CLK_PLL1STEP:
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ccsr = bus_read_4(ccm_softc->res[0], CCMC_CCSR);
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switch ((ccsr & CCSR_STEP_SEL_MASK) >> CCSR_STEP_SEL_SHIFT) {
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case 0:
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return imx51_get_clock(IMX51CLK_LP_APM);
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case 1:
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return 0; /* XXX PLL bypass clock */
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case 2:
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return ccm_softc->pll_freq[2-1] /
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(1 + ((ccsr & CCSR_PLL2_DIV_PODF_MASK) >>
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CCSR_PLL2_DIV_PODF_SHIFT));
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case 3:
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return ccm_softc->pll_freq[3-1] /
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(1 + ((ccsr & CCSR_PLL3_DIV_PODF_MASK) >>
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CCSR_PLL3_DIV_PODF_SHIFT));
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}
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/*NOTREACHED*/
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case IMX51CLK_PLL2SW:
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ccsr = bus_read_4(ccm_softc->res[0], CCMC_CCSR);
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if ((ccsr & CCSR_PLL2_SW_CLK_SEL) == 0)
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return imx51_get_clock(IMX51CLK_PLL2);
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return 0; /* XXX PLL2 bypass clk */
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case IMX51CLK_PLL3SW:
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ccsr = bus_read_4(ccm_softc->res[0], CCMC_CCSR);
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if ((ccsr & CCSR_PLL3_SW_CLK_SEL) == 0)
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return imx51_get_clock(IMX51CLK_PLL3);
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return 0; /* XXX PLL3 bypass clk */
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case IMX51CLK_LP_APM:
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ccsr = bus_read_4(ccm_softc->res[0], CCMC_CCSR);
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return (ccsr & CCSR_LP_APM) ?
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imx51_get_clock(IMX51CLK_FPM) : IMX51_OSC_FREQ;
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case IMX51CLK_ARM_ROOT:
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freq = imx51_get_clock(IMX51CLK_PLL1SW);
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cacrr = bus_read_4(ccm_softc->res[0], CCMC_CACRR);
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return freq / (cacrr + 1);
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/* ... */
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case IMX51CLK_MAIN_BUS_CLK_SRC:
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cbcdr = bus_read_4(ccm_softc->res[0], CCMC_CBCDR);
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if ((cbcdr & CBCDR_PERIPH_CLK_SEL) == 0)
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freq = imx51_get_clock(IMX51CLK_PLL2SW);
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else {
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freq = 0;
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cbcmr = bus_read_4(ccm_softc->res[0], CCMC_CBCMR);
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switch ((cbcmr & CBCMR_PERIPH_APM_SEL_MASK) >>
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CBCMR_PERIPH_APM_SEL_SHIFT) {
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case 0:
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freq = imx51_get_clock(IMX51CLK_PLL1SW);
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break;
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case 1:
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freq = imx51_get_clock(IMX51CLK_PLL3SW);
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break;
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case 2:
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freq = imx51_get_clock(IMX51CLK_LP_APM);
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break;
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case 3:
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/* XXX: error */
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break;
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}
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}
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return freq;
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case IMX51CLK_MAIN_BUS_CLK:
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freq = imx51_get_clock(IMX51CLK_MAIN_BUS_CLK_SRC);
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cdcr = bus_read_4(ccm_softc->res[0], CCMC_CDCR);
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return freq / (cdcr & CDCR_PERIPH_CLK_DVFS_PODF_MASK) >>
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CDCR_PERIPH_CLK_DVFS_PODF_SHIFT;
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case IMX51CLK_AHB_CLK_ROOT:
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freq = imx51_get_clock(IMX51CLK_MAIN_BUS_CLK);
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cbcdr = bus_read_4(ccm_softc->res[0], CCMC_CBCDR);
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return freq / (1 + ((cbcdr & CBCDR_AHB_PODF_MASK) >>
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CBCDR_AHB_PODF_SHIFT));
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case IMX51CLK_IPG_CLK_ROOT:
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freq = imx51_get_clock(IMX51CLK_AHB_CLK_ROOT);
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cbcdr = bus_read_4(ccm_softc->res[0], CCMC_CBCDR);
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return freq / (1 + ((cbcdr & CBCDR_IPG_PODF_MASK) >>
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CBCDR_IPG_PODF_SHIFT));
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case IMX51CLK_PERCLK_ROOT:
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cbcmr = bus_read_4(ccm_softc->res[0], CCMC_CBCMR);
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if (cbcmr & CBCMR_PERCLK_IPG_SEL)
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return imx51_get_clock(IMX51CLK_IPG_CLK_ROOT);
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if (cbcmr & CBCMR_PERCLK_LP_APM_SEL)
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freq = imx51_get_clock(IMX51CLK_LP_APM);
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else
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freq = imx51_get_clock(IMX51CLK_MAIN_BUS_CLK_SRC);
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cbcdr = bus_read_4(ccm_softc->res[0], CCMC_CBCDR);
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#ifdef IMXCCMDEBUG
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printf("cbcmr=%x cbcdr=%x\n", cbcmr, cbcdr);
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#endif
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freq /= 1 + ((cbcdr & CBCDR_PERCLK_PRED1_MASK) >>
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CBCDR_PERCLK_PRED1_SHIFT);
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freq /= 1 + ((cbcdr & CBCDR_PERCLK_PRED2_MASK) >>
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CBCDR_PERCLK_PRED2_SHIFT);
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freq /= 1 + ((cbcdr & CBCDR_PERCLK_PODF_MASK) >>
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CBCDR_PERCLK_PODF_SHIFT);
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return freq;
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case IMX51CLK_UART_CLK_ROOT:
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cscdr1 = bus_read_4(ccm_softc->res[0], CCMC_CSCDR1);
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cscmr1 = bus_read_4(ccm_softc->res[0], CCMC_CSCMR1);
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#ifdef IMXCCMDEBUG
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printf("cscdr1=%x cscmr1=%x\n", cscdr1, cscmr1);
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#endif
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sel = (cscmr1 & CSCMR1_UART_CLK_SEL_MASK) >>
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CSCMR1_UART_CLK_SEL_SHIFT;
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freq = 0; /* shut up GCC */
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switch (sel) {
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case 0:
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case 1:
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case 2:
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freq = imx51_get_clock(IMX51CLK_PLL1SW + sel);
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break;
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case 3:
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freq = imx51_get_clock(IMX51CLK_LP_APM);
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break;
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}
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return freq / (1 + ((cscdr1 & CSCDR1_UART_CLK_PRED_MASK) >>
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CSCDR1_UART_CLK_PRED_SHIFT)) /
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(1 + ((cscdr1 & CSCDR1_UART_CLK_PODF_MASK) >>
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CSCDR1_UART_CLK_PODF_SHIFT));
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case IMX51CLK_IPU_HSP_CLK_ROOT:
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freq = 0;
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cbcmr = bus_read_4(ccm_softc->res[0], CCMC_CBCMR);
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switch ((cbcmr & CBCMR_IPU_HSP_CLK_SEL_MASK) >>
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CBCMR_IPU_HSP_CLK_SEL_SHIFT) {
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case 0:
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freq = imx51_get_clock(IMX51CLK_ARM_AXI_A_CLK);
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break;
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case 1:
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freq = imx51_get_clock(IMX51CLK_ARM_AXI_B_CLK);
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break;
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case 2:
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freq = imx51_get_clock(
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IMX51CLK_EMI_SLOW_CLK_ROOT);
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break;
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case 3:
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freq = imx51_get_clock(IMX51CLK_AHB_CLK_ROOT);
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break;
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}
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return freq;
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default:
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device_printf(ccm_softc->sc_dev,
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"clock %d: not supported yet\n", clk);
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return 0;
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}
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}
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static uint64_t
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imx51_get_pll_freq(u_int pll_no)
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{
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uint32_t dp_ctrl;
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uint32_t dp_op;
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uint32_t dp_mfd;
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uint32_t dp_mfn;
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uint32_t mfi;
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int32_t mfn;
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uint32_t mfd;
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uint32_t pdf;
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uint32_t ccr;
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uint64_t freq = 0;
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u_int ref = 0;
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KASSERT(1 <= pll_no && pll_no <= IMX51_N_DPLLS, ("Wrong PLL id"));
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dp_ctrl = bus_read_4(ccm_softc->res[pll_no], DPLL_DP_CTL);
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if (dp_ctrl & DP_CTL_HFSM) {
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dp_op = bus_read_4(ccm_softc->res[pll_no], DPLL_DP_HFS_OP);
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dp_mfd = bus_read_4(ccm_softc->res[pll_no], DPLL_DP_HFS_MFD);
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dp_mfn = bus_read_4(ccm_softc->res[pll_no], DPLL_DP_HFS_MFN);
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} else {
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dp_op = bus_read_4(ccm_softc->res[pll_no], DPLL_DP_OP);
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dp_mfd = bus_read_4(ccm_softc->res[pll_no], DPLL_DP_MFD);
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dp_mfn = bus_read_4(ccm_softc->res[pll_no], DPLL_DP_MFN);
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}
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pdf = dp_op & DP_OP_PDF_MASK;
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mfi = max(5, (dp_op & DP_OP_MFI_MASK) >> DP_OP_MFI_SHIFT);
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mfd = dp_mfd;
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if (dp_mfn & 0x04000000)
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/* 27bit signed value */
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mfn = (uint32_t)(0xf8000000 | dp_mfn);
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else
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mfn = dp_mfn;
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switch (dp_ctrl & DP_CTL_REF_CLK_SEL_MASK) {
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case DP_CTL_REF_CLK_SEL_COSC:
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/* Internal Oscillator */
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/* TODO: get from FDT "fsl,imx-osc" */
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ref = 24000000; /* IMX51_OSC_FREQ */
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break;
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case DP_CTL_REF_CLK_SEL_FPM:
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ccr = bus_read_4(ccm_softc->res[0], CCMC_CCR);
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if (ccr & CCR_FPM_MULT)
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/* TODO: get from FDT "fsl,imx-ckil" */
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ref = 32768 * 1024;
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else
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/* TODO: get from FDT "fsl,imx-ckil" */
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ref = 32768 * 512;
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break;
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default:
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ref = 0;
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}
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if (dp_ctrl & DP_CTL_REF_CLK_DIV)
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ref /= 2;
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ref *= 4;
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freq = (int64_t)ref * mfi + (int64_t)ref * mfn / (mfd + 1);
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freq /= pdf + 1;
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if (!(dp_ctrl & DP_CTL_DPDCK0_2_EN))
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freq /= 2;
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#ifdef IMXCCMDEBUG
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printf("ref: %dKHz ", ref);
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printf("dp_ctl: %08x ", dp_ctrl);
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printf("pdf: %3d ", pdf);
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printf("mfi: %3d ", mfi);
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|
printf("mfd: %3d ", mfd);
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|
printf("mfn: %3d ", mfn);
|
|
printf("pll: %d\n", (uint32_t)freq);
|
|
#endif
|
|
|
|
ccm_softc->pll_freq[pll_no-1] = freq;
|
|
|
|
return (freq);
|
|
}
|
|
|
|
void
|
|
imx51_clk_gating(int clk_src, int mode)
|
|
{
|
|
int field, group;
|
|
uint32_t reg;
|
|
|
|
group = CCMR_CCGR_MODULE(clk_src);
|
|
field = clk_src % CCMR_CCGR_NSOURCE;
|
|
reg = bus_read_4(ccm_softc->res[0], CCMC_CCGR(group));
|
|
reg &= ~(0x03 << field * 2);
|
|
reg |= (mode << field * 2);
|
|
bus_write_4(ccm_softc->res[0], CCMC_CCGR(group), reg);
|
|
}
|
|
|
|
int
|
|
imx51_get_clk_gating(int clk_src)
|
|
{
|
|
uint32_t reg;
|
|
|
|
reg = bus_read_4(ccm_softc->res[0],
|
|
CCMC_CCGR(CCMR_CCGR_MODULE(clk_src)));
|
|
return ((reg >> (clk_src % CCMR_CCGR_NSOURCE) * 2) & 0x03);
|
|
}
|
|
|