mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-16 10:20:30 +00:00
Implement the FDT static pinctl/pinmux spec for Atmel. This will
configure the mux and config registers for PIO devices based on what we find in the FDT. I developed it per the spec that had been committed to Linux in the January 2014 time frame and haven't updated. In short, bundles of pins are activated in specific ways for specific configurations, and we implement all of that. What's not included is a MI device infrastructure, any dynamic run-time changing of these pins, etc. Also not included are hooks into all the drivers to enable the latter (static at boot no driver changes are needed). These larger questions will need to be answered once we have more drivers like this for more platforms, or somebody has a heck of a lot of time to research a bunch of platforms, the Linux solution (which is good, but has its warts), etc.
This commit is contained in:
Warner Losh
parent
ba78d6b7a1
commit
d90e30ba36
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=270025
524
sys/arm/at91/at91_pinctrl.c
Normal file
524
sys/arm/at91/at91_pinctrl.c
Normal file
@ -0,0 +1,524 @@
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/*-
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* Copyright (c) 2014 Warner Losh. 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 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 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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#include <sys/param.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/resource.h>
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#include <sys/systm.h>
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#include <sys/rman.h>
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#include <machine/bus.h>
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#include <arm/at91/at91var.h>
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#include <arm/at91/at91_piovar.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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#define BUS_PASS_PINMUX (BUS_PASS_INTERRUPT + 1)
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struct pinctrl_range {
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uint64_t bus;
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uint64_t host;
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uint64_t size;
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};
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struct pinctrl_softc {
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device_t dev;
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phandle_t node;
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struct pinctrl_range *ranges;
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int nranges;
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pcell_t acells, scells;
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int done_pinmux;
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};
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struct pinctrl_devinfo {
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struct ofw_bus_devinfo obdinfo;
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struct resource_list rl;
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};
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static int
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at91_pinctrl_probe(device_t dev)
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{
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if (!ofw_bus_is_compatible(dev, "atmel,at91rm9200-pinctrl"))
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return (ENXIO);
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device_set_desc(dev, "pincontrol bus");
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return (0);
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}
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/* XXX Make this a subclass of simplebus */
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static struct pinctrl_devinfo *
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at91_pinctrl_setup_dinfo(device_t dev, phandle_t node)
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{
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struct pinctrl_softc *sc;
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struct pinctrl_devinfo *ndi;
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uint32_t *reg, *intr, icells;
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uint64_t phys, size;
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phandle_t iparent;
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int i, j, k;
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int nintr;
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int nreg;
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sc = device_get_softc(dev);
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ndi = malloc(sizeof(*ndi), M_DEVBUF, M_WAITOK | M_ZERO);
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if (ofw_bus_gen_setup_devinfo(&ndi->obdinfo, node) != 0) {
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free(ndi, M_DEVBUF);
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return (NULL);
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}
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resource_list_init(&ndi->rl);
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nreg = OF_getencprop_alloc(node, "reg", sizeof(*reg), (void **)®);
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if (nreg == -1)
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nreg = 0;
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if (nreg % (sc->acells + sc->scells) != 0) {
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// if (bootverbose)
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device_printf(dev, "Malformed reg property on <%s>\n",
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ndi->obdinfo.obd_name);
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nreg = 0;
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}
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for (i = 0, k = 0; i < nreg; i += sc->acells + sc->scells, k++) {
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phys = size = 0;
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for (j = 0; j < sc->acells; j++) {
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phys <<= 32;
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phys |= reg[i + j];
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}
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for (j = 0; j < sc->scells; j++) {
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size <<= 32;
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size |= reg[i + sc->acells + j];
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}
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resource_list_add(&ndi->rl, SYS_RES_MEMORY, k,
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phys, phys + size - 1, size);
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}
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free(reg, M_OFWPROP);
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nintr = OF_getencprop_alloc(node, "interrupts", sizeof(*intr),
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(void **)&intr);
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if (nintr > 0) {
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if (OF_searchencprop(node, "interrupt-parent", &iparent,
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sizeof(iparent)) == -1) {
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device_printf(dev, "No interrupt-parent found, "
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"assuming direct parent\n");
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iparent = OF_parent(node);
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}
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if (OF_searchencprop(OF_xref_phandle(iparent),
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"#interrupt-cells", &icells, sizeof(icells)) == -1) {
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device_printf(dev, "Missing #interrupt-cells property, "
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"assuming <1>\n");
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icells = 1;
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}
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if (icells < 1 || icells > nintr) {
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device_printf(dev, "Invalid #interrupt-cells property "
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"value <%d>, assuming <1>\n", icells);
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icells = 1;
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}
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for (i = 0, k = 0; i < nintr; i += icells, k++) {
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intr[i] = ofw_bus_map_intr(dev, iparent, icells,
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&intr[i]);
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resource_list_add(&ndi->rl, SYS_RES_IRQ, k, intr[i],
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intr[i], 1);
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}
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free(intr, M_OFWPROP);
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}
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return (ndi);
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}
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static int
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at91_pinctrl_fill_ranges(phandle_t node, struct pinctrl_softc *sc)
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{
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int host_address_cells;
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cell_t *base_ranges;
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ssize_t nbase_ranges;
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int err;
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int i, j, k;
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err = OF_searchencprop(OF_parent(node), "#address-cells",
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&host_address_cells, sizeof(host_address_cells));
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if (err <= 0)
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return (-1);
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nbase_ranges = OF_getproplen(node, "ranges");
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if (nbase_ranges < 0)
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return (-1);
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sc->nranges = nbase_ranges / sizeof(cell_t) /
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(sc->acells + host_address_cells + sc->scells);
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if (sc->nranges == 0)
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return (0);
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sc->ranges = malloc(sc->nranges * sizeof(sc->ranges[0]),
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M_DEVBUF, M_WAITOK);
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base_ranges = malloc(nbase_ranges, M_DEVBUF, M_WAITOK);
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OF_getencprop(node, "ranges", base_ranges, nbase_ranges);
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for (i = 0, j = 0; i < sc->nranges; i++) {
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sc->ranges[i].bus = 0;
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for (k = 0; k < sc->acells; k++) {
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sc->ranges[i].bus <<= 32;
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sc->ranges[i].bus |= base_ranges[j++];
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}
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sc->ranges[i].host = 0;
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for (k = 0; k < host_address_cells; k++) {
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sc->ranges[i].host <<= 32;
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sc->ranges[i].host |= base_ranges[j++];
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}
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sc->ranges[i].size = 0;
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for (k = 0; k < sc->scells; k++) {
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sc->ranges[i].size <<= 32;
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sc->ranges[i].size |= base_ranges[j++];
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}
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}
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free(base_ranges, M_DEVBUF);
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return (sc->nranges);
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}
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static int
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at91_pinctrl_attach(device_t dev)
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{
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struct pinctrl_softc *sc;
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struct pinctrl_devinfo *di;
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phandle_t node;
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device_t cdev;
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sc = device_get_softc(dev);
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node = ofw_bus_get_node(dev);
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sc->dev = dev;
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sc->node = node;
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/*
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* Some important numbers
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*/
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sc->acells = 2;
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OF_getencprop(node, "#address-cells", &sc->acells, sizeof(sc->acells));
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sc->scells = 1;
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OF_getencprop(node, "#size-cells", &sc->scells, sizeof(sc->scells));
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if (at91_pinctrl_fill_ranges(node, sc) < 0) {
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device_printf(dev, "could not get ranges\n");
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return (ENXIO);
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}
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for (node = OF_child(node); node > 0; node = OF_peer(node)) {
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if ((di = at91_pinctrl_setup_dinfo(dev, node)) == NULL)
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continue;
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cdev = device_add_child(dev, NULL, -1);
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if (cdev == NULL) {
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device_printf(dev, "<%s>: device_add_child failed\n",
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di->obdinfo.obd_name);
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resource_list_free(&di->rl);
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ofw_bus_gen_destroy_devinfo(&di->obdinfo);
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free(di, M_DEVBUF);
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continue;
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}
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device_set_ivars(cdev, di);
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}
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return (bus_generic_attach(dev));
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}
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static const struct ofw_bus_devinfo *
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pinctrl_get_devinfo(device_t bus __unused, device_t child)
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{
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struct pinctrl_devinfo *ndi;
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ndi = device_get_ivars(child);
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return (&ndi->obdinfo);
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}
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static struct resource *
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pinctrl_alloc_resource(device_t bus, device_t child, int type, int *rid,
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u_long start, u_long end, u_long count, u_int flags)
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{
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struct pinctrl_softc *sc;
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struct pinctrl_devinfo *di;
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struct resource_list_entry *rle;
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int j;
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sc = device_get_softc(bus);
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/*
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* Request for the default allocation with a given rid: use resource
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* list stored in the local device info.
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*/
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if ((start == 0UL) && (end == ~0UL)) {
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if ((di = device_get_ivars(child)) == NULL)
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return (NULL);
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if (type == SYS_RES_IOPORT)
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type = SYS_RES_MEMORY;
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rle = resource_list_find(&di->rl, type, *rid);
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if (rle == NULL) {
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// if (bootverbose)
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device_printf(bus, "no default resources for "
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"rid = %d, type = %d\n", *rid, type);
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return (NULL);
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}
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start = rle->start;
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end = rle->end;
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count = rle->count;
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}
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if (type == SYS_RES_MEMORY) {
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/* Remap through ranges property */
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for (j = 0; j < sc->nranges; j++) {
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if (start >= sc->ranges[j].bus && end <
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sc->ranges[j].bus + sc->ranges[j].size) {
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start -= sc->ranges[j].bus;
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start += sc->ranges[j].host;
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end -= sc->ranges[j].bus;
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end += sc->ranges[j].host;
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break;
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}
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}
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if (j == sc->nranges && sc->nranges != 0) {
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// if (bootverbose)
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device_printf(bus, "Could not map resource "
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"%#lx-%#lx\n", start, end);
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return (NULL);
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}
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}
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return (bus_generic_alloc_resource(bus, child, type, rid, start, end,
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count, flags));
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}
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static int
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pinctrl_print_res(struct pinctrl_devinfo *di)
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{
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int rv;
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rv = 0;
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rv += resource_list_print_type(&di->rl, "mem", SYS_RES_MEMORY, "%#lx");
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rv += resource_list_print_type(&di->rl, "irq", SYS_RES_IRQ, "%ld");
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return (rv);
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}
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static void
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pinctrl_probe_nomatch(device_t bus, device_t child)
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{
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const char *name, *type, *compat;
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// if (!bootverbose)
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return;
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name = ofw_bus_get_name(child);
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type = ofw_bus_get_type(child);
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compat = ofw_bus_get_compat(child);
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device_printf(bus, "<%s>", name != NULL ? name : "unknown");
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pinctrl_print_res(device_get_ivars(child));
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if (!ofw_bus_status_okay(child))
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printf(" disabled");
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if (type)
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printf(" type %s", type);
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if (compat)
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printf(" compat %s", compat);
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printf(" (no driver attached)\n");
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}
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static int
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pinctrl_print_child(device_t bus, device_t child)
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{
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int rv;
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rv = bus_print_child_header(bus, child);
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rv += pinctrl_print_res(device_get_ivars(child));
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if (!ofw_bus_status_okay(child))
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rv += printf(" disabled");
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rv += bus_print_child_footer(bus, child);
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return (rv);
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}
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const char *periphs[] = {"gpio", "periph A", "periph B", "periph C", "periph D", "periph E" };
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static void
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pinctrl_walk_tree(device_t bus, phandle_t node)
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{
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struct pinctrl_softc *sc;
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char status[10];
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char name[32];
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phandle_t pinctrl[32], pins[32 * 4], scratch;
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ssize_t len, npins;
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int i, j;
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sc = device_get_softc(bus);
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for (node = OF_child(node); node > 0; node = OF_peer(node)) {
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pinctrl_walk_tree(bus, node);
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memset(status, 0, sizeof(status));
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memset(name, 0, sizeof(name));
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OF_getprop(node, "status", status, sizeof(status));
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OF_getprop(node, "name", name, sizeof(name));
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if (strcmp(status, "okay") != 0) {
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// printf("pinctrl: omitting node %s since it isn't active\n", name);
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continue;
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}
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len = OF_getencprop(node, "pinctrl-0", pinctrl, sizeof(pinctrl));
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if (len <= 0) {
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// printf("pinctrl: no pinctrl-0 property for node %s, omitting\n", name);
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continue;
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}
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len /= sizeof(phandle_t);
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printf("pinctrl: Found active node %s\n", name);
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for (i = 0; i < len; i++) {
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scratch = OF_xref_phandle(pinctrl[i]);
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npins = OF_getencprop(scratch, "atmel,pins", pins, sizeof(pins));
|
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if (npins <= 0) {
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printf("We're doing it wrong %s\n", name);
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continue;
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}
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memset(name, 0, sizeof(name));
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OF_getprop(scratch, "name", name, sizeof(name));
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npins /= (4 * 4);
|
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printf("----> need to cope with %d more pins for %s\n", npins, name);
|
||||
for (j = 0; j < npins; j++) {
|
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uint32_t unit = pins[j * 4];
|
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uint32_t pin = pins[j * 4 + 1];
|
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uint32_t periph = pins[j * 4 + 2];
|
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uint32_t flags = pins[j * 4 + 3];
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uint32_t pio = (0xfffffff & sc->ranges[0].bus) + 0x200 * unit;
|
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printf("P%c%d %s %#x\n", unit + 'A', pin, periphs[periph],
|
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flags);
|
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switch (periph) {
|
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case 0:
|
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at91_pio_use_gpio(pio, 1u << pin);
|
||||
at91_pio_gpio_pullup(pio, 1u << pin, !!(flags & 1));
|
||||
at91_pio_gpio_high_z(pio, 1u << pin, !!(flags & 2));
|
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at91_pio_gpio_set_deglitch(pio, 1u << pin, !!(flags & 4));
|
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// at91_pio_gpio_pulldown(pio, 1u << pin, !!(flags & 8));
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// at91_pio_gpio_dis_schmidt(pio, 1u << pin, !!(flags & 16));
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break;
|
||||
case 1:
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||||
at91_pio_use_periph_a(pio, 1u << pin, flags);
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||||
break;
|
||||
case 2:
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||||
at91_pio_use_periph_b(pio, 1u << pin, flags);
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||||
break;
|
||||
}
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||||
}
|
||||
}
|
||||
}
|
||||
}
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||||
|
||||
static void
|
||||
pinctrl_new_pass(device_t bus)
|
||||
{
|
||||
struct pinctrl_softc *sc;
|
||||
phandle_t node;
|
||||
|
||||
sc = device_get_softc(bus);
|
||||
|
||||
bus_generic_new_pass(bus);
|
||||
|
||||
if (sc->done_pinmux || bus_current_pass < BUS_PASS_PINMUX)
|
||||
return;
|
||||
sc->done_pinmux++;
|
||||
|
||||
node = OF_peer(0);
|
||||
if (node == -1)
|
||||
return;
|
||||
pinctrl_walk_tree(bus, node);
|
||||
}
|
||||
|
||||
static device_method_t at91_pinctrl_methods[] = {
|
||||
DEVMETHOD(device_probe, at91_pinctrl_probe),
|
||||
DEVMETHOD(device_attach, at91_pinctrl_attach),
|
||||
|
||||
DEVMETHOD(bus_print_child, pinctrl_print_child),
|
||||
DEVMETHOD(bus_probe_nomatch, pinctrl_probe_nomatch),
|
||||
DEVMETHOD(bus_setup_intr, bus_generic_setup_intr),
|
||||
DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
|
||||
DEVMETHOD(bus_alloc_resource, pinctrl_alloc_resource),
|
||||
DEVMETHOD(bus_release_resource, bus_generic_release_resource),
|
||||
DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
|
||||
DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
|
||||
DEVMETHOD(bus_adjust_resource, bus_generic_adjust_resource),
|
||||
DEVMETHOD(bus_child_pnpinfo_str, ofw_bus_gen_child_pnpinfo_str),
|
||||
DEVMETHOD(bus_new_pass, pinctrl_new_pass),
|
||||
|
||||
/* ofw_bus interface */
|
||||
DEVMETHOD(ofw_bus_get_devinfo, pinctrl_get_devinfo),
|
||||
DEVMETHOD(ofw_bus_get_compat, ofw_bus_gen_get_compat),
|
||||
DEVMETHOD(ofw_bus_get_model, ofw_bus_gen_get_model),
|
||||
DEVMETHOD(ofw_bus_get_name, ofw_bus_gen_get_name),
|
||||
DEVMETHOD(ofw_bus_get_node, ofw_bus_gen_get_node),
|
||||
DEVMETHOD(ofw_bus_get_type, ofw_bus_gen_get_type),
|
||||
|
||||
DEVMETHOD_END
|
||||
};
|
||||
|
||||
static driver_t at91_pinctrl_driver = {
|
||||
"at91_pinctrl",
|
||||
at91_pinctrl_methods,
|
||||
sizeof(struct pinctrl_softc),
|
||||
};
|
||||
|
||||
static devclass_t at91_pinctrl_devclass;
|
||||
|
||||
EARLY_DRIVER_MODULE(at91_pinctrl, simplebus, at91_pinctrl_driver, at91_pinctrl_devclass,
|
||||
NULL, NULL, BUS_PASS_BUS);
|
||||
|
||||
/*
|
||||
* dummy driver to force pass BUS_PASS_PINMUX to happen.
|
||||
*/
|
||||
static int
|
||||
at91_pingroup_probe(device_t dev)
|
||||
{
|
||||
return ENXIO;
|
||||
}
|
||||
|
||||
static device_method_t at91_pingroup_methods[] = {
|
||||
DEVMETHOD(device_probe, at91_pingroup_probe),
|
||||
|
||||
DEVMETHOD_END
|
||||
};
|
||||
|
||||
|
||||
static driver_t at91_pingroup_driver = {
|
||||
"at91_pingroup",
|
||||
at91_pingroup_methods,
|
||||
0,
|
||||
};
|
||||
|
||||
static devclass_t at91_pingroup_devclass;
|
||||
|
||||
EARLY_DRIVER_MODULE(at91_pingroup, at91_pinctrl, at91_pingroup_driver, at91_pingroup_devclass,
|
||||
NULL, NULL, BUS_PASS_PINMUX);
|
||||
@ -590,6 +590,17 @@ at91_pio_gpio_set_deglitch(uint32_t pio, uint32_t data_mask, int use_deglitch)
|
||||
PIO[PIO_IFDR / 4] = data_mask;
|
||||
}
|
||||
|
||||
void
|
||||
at91_pio_gpio_pullup(uint32_t pio, uint32_t data_mask, int do_pullup)
|
||||
{
|
||||
uint32_t *PIO = (uint32_t *)(AT91_BASE + pio);
|
||||
|
||||
if (do_pullup)
|
||||
PIO[PIO_PUER / 4] = data_mask;
|
||||
else
|
||||
PIO[PIO_PUDR / 4] = data_mask;
|
||||
}
|
||||
|
||||
void
|
||||
at91_pio_gpio_set_interrupt(uint32_t pio, uint32_t data_mask,
|
||||
int enable_interrupt)
|
||||
@ -611,12 +622,21 @@ at91_pio_gpio_clear_interrupt(uint32_t pio)
|
||||
return (PIO[PIO_ISR / 4]);
|
||||
}
|
||||
|
||||
static void
|
||||
at91_pio_new_pass(device_t dev)
|
||||
{
|
||||
|
||||
device_printf(dev, "Pass %d\n", bus_current_pass);
|
||||
}
|
||||
|
||||
static device_method_t at91_pio_methods[] = {
|
||||
/* Device interface */
|
||||
DEVMETHOD(device_probe, at91_pio_probe),
|
||||
DEVMETHOD(device_attach, at91_pio_attach),
|
||||
DEVMETHOD(device_detach, at91_pio_detach),
|
||||
|
||||
DEVMETHOD(bus_new_pass, at91_pio_new_pass),
|
||||
|
||||
DEVMETHOD_END
|
||||
};
|
||||
|
||||
@ -626,10 +646,5 @@ static driver_t at91_pio_driver = {
|
||||
sizeof(struct at91_pio_softc),
|
||||
};
|
||||
|
||||
#ifdef FDT
|
||||
DRIVER_MODULE(at91_pio, simplebus, at91_pio_driver, at91_pio_devclass, NULL,
|
||||
NULL);
|
||||
#else
|
||||
DRIVER_MODULE(at91_pio, atmelarm, at91_pio_driver, at91_pio_devclass, NULL,
|
||||
NULL);
|
||||
#endif
|
||||
EARLY_DRIVER_MODULE(at91_pio, at91_pinctrl, at91_pio_driver, at91_pio_devclass,
|
||||
NULL, NULL, BUS_PASS_INTERRUPT);
|
||||
|
||||
@ -45,5 +45,6 @@ void at91_pio_gpio_set_deglitch(uint32_t pio, uint32_t data_mask,
|
||||
void at91_pio_gpio_set_interrupt(uint32_t pio, uint32_t data_mask,
|
||||
int enable_interrupt);
|
||||
uint32_t at91_pio_gpio_clear_interrupt(uint32_t pio);
|
||||
void at91_pio_gpio_pullup(uint32_t pio, uint32_t data_mask, int do_pullup);
|
||||
|
||||
#endif /* ARM_AT91_AT91_PIOVAR_H */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user