357 lines
8.7 KiB
C
357 lines
8.7 KiB
C
/*-
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* Copyright (c) 2013 Ian Lepore <ian@freebsd.org>
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* All rights reserved.
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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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* Clocks and power control driver for Freescale i.MX6 family of SoCs.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/bus.h>
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#include <sys/rman.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 <arm/freescale/imx/imx6_anatopreg.h>
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#include <arm/freescale/imx/imx6_anatopvar.h>
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#include <arm/freescale/imx/imx6_ccmreg.h>
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#include <arm/freescale/imx/imx_machdep.h>
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#include <arm/freescale/imx/imx_ccmvar.h>
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#ifndef CCGR_CLK_MODE_ALWAYS
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#define CCGR_CLK_MODE_OFF 0
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#define CCGR_CLK_MODE_RUNMODE 1
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#define CCGR_CLK_MODE_ALWAYS 3
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#endif
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struct ccm_softc {
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device_t dev;
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struct resource *mem_res;
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};
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static struct ccm_softc *ccm_sc;
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static inline uint32_t
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RD4(struct ccm_softc *sc, bus_size_t off)
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{
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return (bus_read_4(sc->mem_res, off));
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}
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static inline void
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WR4(struct ccm_softc *sc, bus_size_t off, uint32_t val)
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{
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bus_write_4(sc->mem_res, off, val);
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}
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/*
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* Until we have a fully functional ccm driver which implements the fdt_clock
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* interface, use the age-old workaround of unconditionally enabling the clocks
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* for devices we might need to use. The SoC defaults to most clocks enabled,
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* but the rom boot code and u-boot disable a few of them. We turn on only
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* what's needed to run the chip plus devices we have drivers for, and turn off
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* devices we don't yet have drivers for. (Note that USB is not turned on here
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* because that is one we do when the driver asks for it.)
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*/
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static void
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ccm_init_gates(struct ccm_softc *sc)
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{
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/* Turns on... */
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WR4(sc, CCM_CCGR0, 0x0000003f); /* ahpbdma, aipstz 1 & 2 busses */
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WR4(sc, CCM_CCGR1, 0x00300c00); /* gpt, enet */
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WR4(sc, CCM_CCGR2, 0x0fffffc0); /* ipmux & ipsync (bridges), iomux, i2c */
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WR4(sc, CCM_CCGR3, 0x3ff00000); /* DDR memory controller */
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WR4(sc, CCM_CCGR4, 0x0000f300); /* pl301 bus crossbar */
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WR4(sc, CCM_CCGR5, 0x0ffc00c0); /* uarts, ssi, sdma */
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WR4(sc, CCM_CCGR6, 0x000000ff); /* usdhc 1-4 */
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}
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static int
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ccm_detach(device_t dev)
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{
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struct ccm_softc *sc;
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sc = device_get_softc(dev);
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if (sc->mem_res != NULL)
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bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->mem_res);
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return (0);
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}
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static int
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ccm_attach(device_t dev)
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{
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struct ccm_softc *sc;
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int err, rid;
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uint32_t reg;
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sc = device_get_softc(dev);
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err = 0;
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/* Allocate bus_space resources. */
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rid = 0;
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sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
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RF_ACTIVE);
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if (sc->mem_res == NULL) {
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device_printf(dev, "Cannot allocate memory resources\n");
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err = ENXIO;
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goto out;
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}
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ccm_sc = sc;
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/*
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* Configure the Low Power Mode setting to leave the ARM core power on
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* when a WFI instruction is executed. This lets the MPCore timers and
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* GIC continue to run, which is helpful when the only thing that can
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* wake you up is an MPCore Private Timer interrupt delivered via GIC.
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*
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* XXX Based on the docs, setting CCM_CGPR_INT_MEM_CLK_LPM shouldn't be
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* required when the LPM bits are set to LPM_RUN. But experimentally
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* I've experienced a fairly rare lockup when not setting it. I was
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* unable to prove conclusively that the lockup was related to power
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* management or that this definitively fixes it. Revisit this.
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*/
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reg = RD4(sc, CCM_CGPR);
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reg |= CCM_CGPR_INT_MEM_CLK_LPM;
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WR4(sc, CCM_CGPR, reg);
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reg = RD4(sc, CCM_CLPCR);
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reg = (reg & ~CCM_CLPCR_LPM_MASK) | CCM_CLPCR_LPM_RUN;
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WR4(sc, CCM_CLPCR, reg);
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ccm_init_gates(sc);
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err = 0;
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out:
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if (err != 0)
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ccm_detach(dev);
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return (err);
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}
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static int
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ccm_probe(device_t dev)
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{
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if (!ofw_bus_status_okay(dev))
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return (ENXIO);
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if (ofw_bus_is_compatible(dev, "fsl,imx6q-ccm") == 0)
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return (ENXIO);
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device_set_desc(dev, "Freescale i.MX6 Clock Control Module");
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return (BUS_PROBE_DEFAULT);
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}
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void
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imx_ccm_ssi_configure(device_t _ssidev)
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{
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struct ccm_softc *sc;
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uint32_t reg;
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sc = ccm_sc;
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/*
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* Select PLL4 (Audio PLL) clock multiplexer as source.
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* PLL output frequency = Fref * (DIV_SELECT + NUM/DENOM).
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*/
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reg = RD4(sc, CCM_CSCMR1);
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reg &= ~(SSI_CLK_SEL_M << SSI1_CLK_SEL_S);
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reg |= (SSI_CLK_SEL_PLL4 << SSI1_CLK_SEL_S);
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reg &= ~(SSI_CLK_SEL_M << SSI2_CLK_SEL_S);
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reg |= (SSI_CLK_SEL_PLL4 << SSI2_CLK_SEL_S);
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reg &= ~(SSI_CLK_SEL_M << SSI3_CLK_SEL_S);
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reg |= (SSI_CLK_SEL_PLL4 << SSI3_CLK_SEL_S);
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WR4(sc, CCM_CSCMR1, reg);
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/*
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* Ensure we have set hardware-default values
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* for pre and post dividers.
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*/
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/* SSI1 and SSI3 */
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reg = RD4(sc, CCM_CS1CDR);
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/* Divide by 2 */
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reg &= ~(SSI_CLK_PODF_MASK << SSI1_CLK_PODF_SHIFT);
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reg &= ~(SSI_CLK_PODF_MASK << SSI3_CLK_PODF_SHIFT);
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reg |= (0x1 << SSI1_CLK_PODF_SHIFT);
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reg |= (0x1 << SSI3_CLK_PODF_SHIFT);
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/* Divide by 4 */
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reg &= ~(SSI_CLK_PRED_MASK << SSI1_CLK_PRED_SHIFT);
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reg &= ~(SSI_CLK_PRED_MASK << SSI3_CLK_PRED_SHIFT);
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reg |= (0x3 << SSI1_CLK_PRED_SHIFT);
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reg |= (0x3 << SSI3_CLK_PRED_SHIFT);
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WR4(sc, CCM_CS1CDR, reg);
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/* SSI2 */
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reg = RD4(sc, CCM_CS2CDR);
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/* Divide by 2 */
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reg &= ~(SSI_CLK_PODF_MASK << SSI2_CLK_PODF_SHIFT);
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reg |= (0x1 << SSI2_CLK_PODF_SHIFT);
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/* Divide by 4 */
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reg &= ~(SSI_CLK_PRED_MASK << SSI2_CLK_PRED_SHIFT);
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reg |= (0x3 << SSI2_CLK_PRED_SHIFT);
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WR4(sc, CCM_CS2CDR, reg);
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}
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void
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imx_ccm_usb_enable(device_t _usbdev)
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{
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/*
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* For imx6, the USBOH3 clock gate is bits 0-1 of CCGR6, so no need for
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* shifting and masking here, just set the low-order two bits to ALWAYS.
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*/
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WR4(ccm_sc, CCM_CCGR6, RD4(ccm_sc, CCM_CCGR6) | CCGR_CLK_MODE_ALWAYS);
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}
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void
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imx_ccm_usbphy_enable(device_t _phydev)
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{
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/*
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* XXX Which unit?
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* Right now it's not clear how to figure from fdt data which phy unit
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* we're supposed to operate on. Until this is worked out, just enable
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* both PHYs.
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*/
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#if 0
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int phy_num, regoff;
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phy_num = 0; /* XXX */
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switch (phy_num) {
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case 0:
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regoff = 0;
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break;
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case 1:
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regoff = 0x10;
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break;
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default:
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device_printf(ccm_sc->dev, "Bad PHY number %u,\n",
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phy_num);
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return;
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}
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imx6_anatop_write_4(IMX6_ANALOG_CCM_PLL_USB1 + regoff,
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IMX6_ANALOG_CCM_PLL_USB_ENABLE |
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IMX6_ANALOG_CCM_PLL_USB_POWER |
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IMX6_ANALOG_CCM_PLL_USB_EN_USB_CLKS);
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#else
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imx6_anatop_write_4(IMX6_ANALOG_CCM_PLL_USB1 + 0,
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IMX6_ANALOG_CCM_PLL_USB_ENABLE |
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IMX6_ANALOG_CCM_PLL_USB_POWER |
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IMX6_ANALOG_CCM_PLL_USB_EN_USB_CLKS);
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imx6_anatop_write_4(IMX6_ANALOG_CCM_PLL_USB1 + 0x10,
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IMX6_ANALOG_CCM_PLL_USB_ENABLE |
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IMX6_ANALOG_CCM_PLL_USB_POWER |
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IMX6_ANALOG_CCM_PLL_USB_EN_USB_CLKS);
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#endif
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}
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uint32_t
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imx_ccm_ipg_hz(void)
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{
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return (66000000);
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}
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uint32_t
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imx_ccm_perclk_hz(void)
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{
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return (66000000);
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}
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uint32_t
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imx_ccm_sdhci_hz(void)
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{
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return (200000000);
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}
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uint32_t
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imx_ccm_uart_hz(void)
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{
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return (80000000);
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}
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uint32_t
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imx_ccm_ahb_hz(void)
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{
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return (132000000);
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}
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uint32_t
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imx_ccm_get_cacrr(void)
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{
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return (RD4(ccm_sc, CCM_CACCR));
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}
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void
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imx_ccm_set_cacrr(uint32_t divisor)
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{
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WR4(ccm_sc, CCM_CACCR, divisor);
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}
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static device_method_t ccm_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, ccm_probe),
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DEVMETHOD(device_attach, ccm_attach),
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DEVMETHOD(device_detach, ccm_detach),
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DEVMETHOD_END
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};
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static driver_t ccm_driver = {
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"ccm",
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ccm_methods,
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sizeof(struct ccm_softc)
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};
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static devclass_t ccm_devclass;
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EARLY_DRIVER_MODULE(ccm, simplebus, ccm_driver, ccm_devclass, 0, 0,
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BUS_PASS_CPU + BUS_PASS_ORDER_EARLY);
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