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/*-
* Copyright (c) 2013 Ian Lepore <ian@freebsd.org>
* All rights reserved.
*
* 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("$FreeBSD$");
/*
* Clocks and power control driver for Freescale i.MX6 family of SoCs.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <sys/rman.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include <machine/bus.h>
#include <arm/freescale/imx/imx6_anatopreg.h>
#include <arm/freescale/imx/imx6_anatopvar.h>
#include <arm/freescale/imx/imx_machdep.h>
#include <arm/freescale/imx/imx6_ccmreg.h>
/* XXX temp kludge for imx51_get_clock. */
#include <arm/freescale/imx/imx51_ccmvar.h>
#include <arm/freescale/imx/imx51_ccmreg.h>
struct ccm_softc {
device_t dev;
struct resource *mem_res;
};
static struct ccm_softc *ccm_sc;
static inline uint32_t
RD4(struct ccm_softc *sc, bus_size_t off)
{
return (bus_read_4(sc->mem_res, off));
}
static inline void
WR4(struct ccm_softc *sc, bus_size_t off, uint32_t val)
{
bus_write_4(sc->mem_res, off, val);
}
static int
ccm_detach(device_t dev)
{
struct ccm_softc *sc;
sc = device_get_softc(dev);
if (sc->mem_res != NULL)
bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->mem_res);
return (0);
}
static int
ccm_attach(device_t dev)
{
struct ccm_softc *sc;
int err, rid;
sc = device_get_softc(dev);
err = 0;
/* Allocate bus_space resources. */
rid = 0;
sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
RF_ACTIVE);
if (sc->mem_res == NULL) {
device_printf(dev, "Cannot allocate memory resources\n");
err = ENXIO;
goto out;
}
ccm_sc = sc;
err = 0;
out:
if (err != 0)
ccm_detach(dev);
return (err);
}
static int
ccm_probe(device_t dev)
{
if (ofw_bus_is_compatible(dev, "fsl,imx6q-ccm") == 0)
return (ENXIO);
device_set_desc(dev, "Freescale i.MX6 Clock Control Module");
return (BUS_PROBE_DEFAULT);
}
void
imx_ccm_usb_enable(device_t _usbdev)
{
/*
* For imx6, the USBOH3 clock gate is bits 0-1 of CCGR6, so no need for
* shifting and masking here, just set the low-order two bits to ALWAYS.
*/
WR4(ccm_sc, CCM_CCGR6, RD4(ccm_sc, CCM_CCGR6) | CCGR_CLK_MODE_ALWAYS);
}
void
imx_ccm_usbphy_enable(device_t _phydev)
{
/*
* XXX Which unit?
* Right now it's not clear how to figure from fdt data which phy unit
* we're supposed to operate on. Until this is worked out, just enable
* both PHYs.
*/
#if 0
int phy_num, regoff;
phy_num = 0; /* XXX */
switch (phy_num) {
case 0:
regoff = 0;
break;
case 1:
regoff = 0x10;
break;
default:
device_printf(ccm_sc->dev, "Bad PHY number %u,\n",
phy_num);
return;
}
imx6_anatop_write_4(IMX6_ANALOG_CCM_PLL_USB1 + regoff,
IMX6_ANALOG_CCM_PLL_USB_ENABLE |
IMX6_ANALOG_CCM_PLL_USB_POWER |
IMX6_ANALOG_CCM_PLL_USB_EN_USB_CLKS);
#else
imx6_anatop_write_4(IMX6_ANALOG_CCM_PLL_USB1 + 0,
IMX6_ANALOG_CCM_PLL_USB_ENABLE |
IMX6_ANALOG_CCM_PLL_USB_POWER |
IMX6_ANALOG_CCM_PLL_USB_EN_USB_CLKS);
imx6_anatop_write_4(IMX6_ANALOG_CCM_PLL_USB1 + 0x10,
IMX6_ANALOG_CCM_PLL_USB_ENABLE |
IMX6_ANALOG_CCM_PLL_USB_POWER |
IMX6_ANALOG_CCM_PLL_USB_EN_USB_CLKS);
#endif
}
// XXX Fix this. This has to be here for other code to link,
// but it doesn't have to return anything useful for imx6 right now.
u_int
imx51_get_clock(enum imx51_clock clk)
{
switch (clk)
{
case IMX51CLK_IPG_CLK_ROOT:
return 66000000;
default:
printf("imx51_get_clock() on imx6 doesn't know about clock %d\n", clk);
break;
}
return 0;
}
static device_method_t ccm_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, ccm_probe),
DEVMETHOD(device_attach, ccm_attach),
DEVMETHOD(device_detach, ccm_detach),
DEVMETHOD_END
};
static driver_t ccm_driver = {
"ccm",
ccm_methods,
sizeof(struct ccm_softc)
};
static devclass_t ccm_devclass;
DRIVER_MODULE(ccm, simplebus, ccm_driver, ccm_devclass, 0, 0);
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