Author: gonzo
Date: Sun Apr 8 00:56:19 2018
New Revision: 332262
URL: https://svnweb.freebsd.org/changeset/base/332262
Log:
[rpi] Add fdt_pinctrl(4) support to Raspberry Pi GPIO driver
On Raspberry Pi platform GPIO controller also responsible for pins
multiplexing. Pi code predates proper FDT support in FreeBSD so a
lot of pinmux info is hardcoded. This patch:
- Implements pinctl methods in bcm2835_gpio
- Converts all devices with ad-hoc pinmux info to proper pin control
mechanisms and adds pinmux info in FreeBSD's custom dts files.
- Adds fdt_pinctrl option to RPI2 and RPI-B kernels
- Adds SPI pinmux config to FreeBSD's customization of GNU DTS.
Reviewed by: imp, manu
Differential Revision: https://reviews.freebsd.org/D14104
Deleted:
head/sys/arm/broadcom/bcm2835/bcm2835_gpio.h
Modified:
head/sys/arm/broadcom/bcm2835/bcm2835_bsc.c
head/sys/arm/broadcom/bcm2835/bcm2835_bscvar.h
head/sys/arm/broadcom/bcm2835/bcm2835_gpio.c
head/sys/arm/broadcom/bcm2835/bcm2835_intr.c
head/sys/arm/broadcom/bcm2835/bcm2835_pwm.c
head/sys/arm/broadcom/bcm2835/bcm2835_spi.c
head/sys/arm/broadcom/bcm2835/bcm2835_spivar.h
head/sys/arm/broadcom/bcm2835/bcm2836.c
head/sys/arm/conf/RPI-B
head/sys/arm/conf/RPI2
head/sys/dts/arm/rpi.dts
head/sys/dts/arm/rpi2.dts
Modified: head/sys/arm/broadcom/bcm2835/bcm2835_bsc.c
==============================================================================
--- head/sys/arm/broadcom/bcm2835/bcm2835_bsc.c Sat Apr 7 23:31:55 2018
(r332261)
+++ head/sys/arm/broadcom/bcm2835/bcm2835_bsc.c Sun Apr 8 00:56:19 2018
(r332262)
@@ -100,7 +100,6 @@ __FBSDID("$FreeBSD$");
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
-#include <arm/broadcom/bcm2835/bcm2835_gpio.h>
#include <arm/broadcom/bcm2835/bcm2835_bscreg.h>
#include <arm/broadcom/bcm2835/bcm2835_bscvar.h>
@@ -298,9 +297,7 @@ static int
bcm_bsc_attach(device_t dev)
{
struct bcm_bsc_softc *sc;
- unsigned long start;
- device_t gpio;
- int i, rid;
+ int rid;
sc = device_get_softc(dev);
sc->sc_dev = dev;
@@ -315,31 +312,6 @@ bcm_bsc_attach(device_t dev)
sc->sc_bst = rman_get_bustag(sc->sc_mem_res);
sc->sc_bsh = rman_get_bushandle(sc->sc_mem_res);
-
- /* Check the unit we are attaching by its base address. */
- start = rman_get_start(sc->sc_mem_res);
- for (i = 0; i < nitems(bcm_bsc_pins); i++) {
- if (bcm_bsc_pins[i].start == (start & BCM_BSC_BASE_MASK))
- break;
- }
- if (i == nitems(bcm_bsc_pins)) {
- device_printf(dev, "only bsc0 and bsc1 are supported\n");
- bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->sc_mem_res);
- return (ENXIO);
- }
-
- /*
- * Configure the GPIO pins to ALT0 function to enable BSC control
- * over the pins.
- */
- gpio = devclass_get_device(devclass_find("gpio"), 0);
- if (!gpio) {
- device_printf(dev, "cannot find gpio0\n");
- bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->sc_mem_res);
- return (ENXIO);
- }
- bcm_gpio_set_alternate(gpio, bcm_bsc_pins[i].sda, BCM_GPIO_ALT0);
- bcm_gpio_set_alternate(gpio, bcm_bsc_pins[i].scl, BCM_GPIO_ALT0);
rid = 0;
sc->sc_irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
Modified: head/sys/arm/broadcom/bcm2835/bcm2835_bscvar.h
==============================================================================
--- head/sys/arm/broadcom/bcm2835/bcm2835_bscvar.h Sat Apr 7 23:31:55
2018 (r332261)
+++ head/sys/arm/broadcom/bcm2835/bcm2835_bscvar.h Sun Apr 8 00:56:19
2018 (r332262)
@@ -32,16 +32,6 @@
#ifndef _BCM2835_BSCVAR_H
#define _BCM2835_BSCVAR_H
-struct {
- uint32_t sda;
- uint32_t scl;
- unsigned long start;
-} bcm_bsc_pins[] = {
- { 0, 1, 0x205000 }, /* BSC0 GPIO pins and base address. */
- { 2, 3, 0x804000 } /* BSC1 GPIO pins and base address. */
-};
-#define BCM_BSC_BASE_MASK 0x00ffffff
-
struct iic_msg;
struct bcm_bsc_softc {
Modified: head/sys/arm/broadcom/bcm2835/bcm2835_gpio.c
==============================================================================
--- head/sys/arm/broadcom/bcm2835/bcm2835_gpio.c Sat Apr 7 23:31:55
2018 (r332261)
+++ head/sys/arm/broadcom/bcm2835/bcm2835_gpio.c Sun Apr 8 00:56:19
2018 (r332262)
@@ -48,11 +48,10 @@ __FBSDID("$FreeBSD$");
#include <machine/bus.h>
#include <machine/intr.h>
+#include <dev/fdt/fdt_pinctrl.h>
#include <dev/gpio/gpiobusvar.h>
#include <dev/ofw/ofw_bus.h>
-#include <arm/broadcom/bcm2835/bcm2835_gpio.h>
-
#include "gpio_if.h"
#include "pic_if.h"
@@ -73,6 +72,19 @@ __FBSDID("$FreeBSD$");
GPIO_INTR_LEVEL_HIGH | GPIO_INTR_EDGE_RISING | \
GPIO_INTR_EDGE_FALLING | GPIO_INTR_EDGE_BOTH)
+#define BCM2835_FSEL_GPIO_IN 0
+#define BCM2835_FSEL_GPIO_OUT 1
+#define BCM2835_FSEL_ALT5 2
+#define BCM2835_FSEL_ALT4 3
+#define BCM2835_FSEL_ALT0 4
+#define BCM2835_FSEL_ALT1 5
+#define BCM2835_FSEL_ALT2 6
+#define BCM2835_FSEL_ALT3 7
+
+#define BCM2835_PUD_OFF 0
+#define BCM2835_PUD_DOWN 1
+#define BCM2835_PUD_UP 2
+
static struct resource_spec bcm_gpio_res_spec[] = {
{ SYS_RES_MEMORY, 0, RF_ACTIVE },
{ SYS_RES_IRQ, 0, RF_ACTIVE }, /* bank 0 interrupt */
@@ -187,28 +199,28 @@ bcm_gpio_func_str(uint32_t nfunc, char *buf, int bufsi
{
switch (nfunc) {
- case BCM_GPIO_INPUT:
+ case BCM2835_FSEL_GPIO_IN:
strncpy(buf, "input", bufsize);
break;
- case BCM_GPIO_OUTPUT:
+ case BCM2835_FSEL_GPIO_OUT:
strncpy(buf, "output", bufsize);
break;
- case BCM_GPIO_ALT0:
+ case BCM2835_FSEL_ALT0:
strncpy(buf, "alt0", bufsize);
break;
- case BCM_GPIO_ALT1:
+ case BCM2835_FSEL_ALT1:
strncpy(buf, "alt1", bufsize);
break;
- case BCM_GPIO_ALT2:
+ case BCM2835_FSEL_ALT2:
strncpy(buf, "alt2", bufsize);
break;
- case BCM_GPIO_ALT3:
+ case BCM2835_FSEL_ALT3:
strncpy(buf, "alt3", bufsize);
break;
- case BCM_GPIO_ALT4:
+ case BCM2835_FSEL_ALT4:
strncpy(buf, "alt4", bufsize);
break;
- case BCM_GPIO_ALT5:
+ case BCM2835_FSEL_ALT5:
strncpy(buf, "alt5", bufsize);
break;
default:
@@ -221,21 +233,21 @@ bcm_gpio_str_func(char *func, uint32_t *nfunc)
{
if (strcasecmp(func, "input") == 0)
- *nfunc = BCM_GPIO_INPUT;
+ *nfunc = BCM2835_FSEL_GPIO_IN;
else if (strcasecmp(func, "output") == 0)
- *nfunc = BCM_GPIO_OUTPUT;
+ *nfunc = BCM2835_FSEL_GPIO_OUT;
else if (strcasecmp(func, "alt0") == 0)
- *nfunc = BCM_GPIO_ALT0;
+ *nfunc = BCM2835_FSEL_ALT0;
else if (strcasecmp(func, "alt1") == 0)
- *nfunc = BCM_GPIO_ALT1;
+ *nfunc = BCM2835_FSEL_ALT1;
else if (strcasecmp(func, "alt2") == 0)
- *nfunc = BCM_GPIO_ALT2;
+ *nfunc = BCM2835_FSEL_ALT2;
else if (strcasecmp(func, "alt3") == 0)
- *nfunc = BCM_GPIO_ALT3;
+ *nfunc = BCM2835_FSEL_ALT3;
else if (strcasecmp(func, "alt4") == 0)
- *nfunc = BCM_GPIO_ALT4;
+ *nfunc = BCM2835_FSEL_ALT4;
else if (strcasecmp(func, "alt5") == 0)
- *nfunc = BCM_GPIO_ALT5;
+ *nfunc = BCM2835_FSEL_ALT5;
else
return (-1);
@@ -247,9 +259,9 @@ bcm_gpio_func_flag(uint32_t nfunc)
{
switch (nfunc) {
- case BCM_GPIO_INPUT:
+ case BCM2835_FSEL_GPIO_IN:
return (GPIO_PIN_INPUT);
- case BCM_GPIO_OUTPUT:
+ case BCM2835_FSEL_GPIO_OUT:
return (GPIO_PIN_OUTPUT);
}
return (0);
@@ -288,7 +300,7 @@ bcm_gpio_set_pud(struct bcm_gpio_softc *sc, uint32_t p
BCM_GPIO_WRITE(sc, BCM_GPIO_GPPUDCLK(bank), 0);
}
-void
+static void
bcm_gpio_set_alternate(device_t dev, uint32_t pin, uint32_t nfunc)
{
struct bcm_gpio_softc *sc;
@@ -297,10 +309,7 @@ bcm_gpio_set_alternate(device_t dev, uint32_t pin, uin
sc = device_get_softc(dev);
BCM_GPIO_LOCK(sc);
- /* Disable pull-up or pull-down on pin. */
- bcm_gpio_set_pud(sc, pin, BCM_GPIO_NONE);
-
- /* And now set the pin function. */
+ /* Set the pin function. */
bcm_gpio_set_function(sc, pin, nfunc);
/* Update the pin flags. */
@@ -329,11 +338,11 @@ bcm_gpio_pin_configure(struct bcm_gpio_softc *sc, stru
if (flags & GPIO_PIN_OUTPUT) {
pin->gp_flags |= GPIO_PIN_OUTPUT;
bcm_gpio_set_function(sc, pin->gp_pin,
- BCM_GPIO_OUTPUT);
+ BCM2835_FSEL_GPIO_OUT);
} else {
pin->gp_flags |= GPIO_PIN_INPUT;
bcm_gpio_set_function(sc, pin->gp_pin,
- BCM_GPIO_INPUT);
+ BCM2835_FSEL_GPIO_IN);
}
}
@@ -793,6 +802,9 @@ bcm_gpio_attach(device_t dev)
if (sc->sc_busdev == NULL)
goto fail;
+ fdt_pinctrl_register(dev, "brcm,pins");
+ fdt_pinctrl_configure_tree(dev);
+
return (0);
fail:
@@ -1187,6 +1199,84 @@ bcm_gpio_get_node(device_t bus, device_t dev)
return (ofw_bus_get_node(bus));
}
+static int
+bcm_gpio_configure_pins(device_t dev, phandle_t cfgxref)
+{
+ phandle_t cfgnode;
+ int i, pintuples, pulltuples;
+ uint32_t pin;
+ uint32_t *pins;
+ uint32_t *pulls;
+ uint32_t function;
+ static struct bcm_gpio_softc *sc;
+
+ sc = device_get_softc(dev);
+ cfgnode = OF_node_from_xref(cfgxref);
+
+ pins = NULL;
+ pintuples = OF_getencprop_alloc(cfgnode, "brcm,pins", sizeof(*pins),
+ (void **)&pins);
+
+ char name[32];
+ OF_getprop(cfgnode, "name", &name, sizeof(name));
+
+ if (pintuples < 0)
+ return (ENOENT);
+
+ if (pintuples == 0)
+ return (0); /* Empty property is not an error. */
+
+ if (OF_getencprop(cfgnode, "brcm,function", &function,
+ sizeof(function)) <= 0) {
+ OF_prop_free(pins);
+ return (EINVAL);
+ }
+
+ pulls = NULL;
+ pulltuples = OF_getencprop_alloc(cfgnode, "brcm,pull", sizeof(*pulls),
+ (void **)&pulls);
+
+ if ((pulls != NULL) && (pulltuples != pintuples)) {
+ OF_prop_free(pins);
+ OF_prop_free(pulls);
+ return (EINVAL);
+ }
+
+ for (i = 0; i < pintuples; i++) {
+ pin = pins[i];
+ bcm_gpio_set_alternate(dev, pin, function);
+ if (bootverbose)
+ device_printf(dev, "set pin %d to func %d", pin,
function);
+ if (pulls) {
+ if (bootverbose)
+ printf(", pull %d", pulls[i]);
+ switch (pulls[i]) {
+ /* Convert to gpio(4) flags */
+ case BCM2835_PUD_OFF:
+ bcm_gpio_pin_setflags(dev, pin, 0);
+ break;
+ case BCM2835_PUD_UP:
+ bcm_gpio_pin_setflags(dev, pin,
GPIO_PIN_PULLUP);
+ break;
+ case BCM2835_PUD_DOWN:
+ bcm_gpio_pin_setflags(dev, pin,
GPIO_PIN_PULLDOWN);
+ break;
+ default:
+ printf("%s: invalid pull value for pin %d:
%d\n",
+ name, pin, pulls[i]);
+ }
+ }
+ if (bootverbose)
+ printf("\n");
+ }
+
+ OF_prop_free(pins);
+ if (pulls)
+ OF_prop_free(pulls);
+
+ return (0);
+}
+
static device_method_t bcm_gpio_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, bcm_gpio_probe),
@@ -1217,6 +1307,9 @@ static device_method_t bcm_gpio_methods[] = {
/* ofw_bus interface */
DEVMETHOD(ofw_bus_get_node, bcm_gpio_get_node),
+ /* fdt_pinctrl interface */
+ DEVMETHOD(fdt_pinctrl_configure, bcm_gpio_configure_pins),
+
DEVMETHOD_END
};
@@ -1228,4 +1321,4 @@ static driver_t bcm_gpio_driver = {
sizeof(struct bcm_gpio_softc),
};
-DRIVER_MODULE(bcm_gpio, simplebus, bcm_gpio_driver, bcm_gpio_devclass, 0, 0);
+EARLY_DRIVER_MODULE(bcm_gpio, simplebus, bcm_gpio_driver, bcm_gpio_devclass,
0, 0, BUS_PASS_INTERRUPT + BUS_PASS_ORDER_LATE);
Modified: head/sys/arm/broadcom/bcm2835/bcm2835_intr.c
==============================================================================
--- head/sys/arm/broadcom/bcm2835/bcm2835_intr.c Sat Apr 7 23:31:55
2018 (r332261)
+++ head/sys/arm/broadcom/bcm2835/bcm2835_intr.c Sun Apr 8 00:56:19
2018 (r332262)
@@ -452,4 +452,4 @@ static driver_t bcm_intc_driver = {
static devclass_t bcm_intc_devclass;
EARLY_DRIVER_MODULE(intc, simplebus, bcm_intc_driver, bcm_intc_devclass,
- 0, 0, BUS_PASS_INTERRUPT + BUS_PASS_ORDER_LATE);
+ 0, 0, BUS_PASS_INTERRUPT + BUS_PASS_ORDER_MIDDLE);
Modified: head/sys/arm/broadcom/bcm2835/bcm2835_pwm.c
==============================================================================
--- head/sys/arm/broadcom/bcm2835/bcm2835_pwm.c Sat Apr 7 23:31:55 2018
(r332261)
+++ head/sys/arm/broadcom/bcm2835/bcm2835_pwm.c Sun Apr 8 00:56:19 2018
(r332262)
@@ -46,7 +46,6 @@ __FBSDID("$FreeBSD$");
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
-#include <arm/broadcom/bcm2835/bcm2835_gpio.h>
#include <arm/broadcom/bcm2835/bcm2835_clkman.h>
static struct ofw_compat_data compat_data[] = {
@@ -93,7 +92,6 @@ static int
bcm_pwm_reconf(struct bcm_pwm_softc *sc)
{
uint32_t u;
- device_t gpio;
/* Disable PWM */
W_CTL(sc, 0);
@@ -103,14 +101,6 @@ bcm_pwm_reconf(struct bcm_pwm_softc *sc)
if (sc->mode == 0)
return (0);
-
- /* Ask GPIO0 to set ALT0 for pin 12 */
- gpio = devclass_get_device(devclass_find("gpio"), 0);
- if (!gpio) {
- device_printf(sc->sc_dev, "cannot find gpio0\n");
- return (ENXIO);
- }
- bcm_gpio_set_alternate(gpio, 12, BCM_GPIO_ALT0);
u = bcm2835_clkman_set_frequency(sc->clkman, BCM_PWM_CLKSRC, sc->freq);
if (u == 0)
Modified: head/sys/arm/broadcom/bcm2835/bcm2835_spi.c
==============================================================================
--- head/sys/arm/broadcom/bcm2835/bcm2835_spi.c Sat Apr 7 23:31:55 2018
(r332261)
+++ head/sys/arm/broadcom/bcm2835/bcm2835_spi.c Sun Apr 8 00:56:19 2018
(r332262)
@@ -51,7 +51,6 @@ __FBSDID("$FreeBSD$");
#include <dev/spibus/spi.h>
#include <dev/spibus/spibusvar.h>
-#include <arm/broadcom/bcm2835/bcm2835_gpio.h>
#include <arm/broadcom/bcm2835/bcm2835_spireg.h>
#include <arm/broadcom/bcm2835/bcm2835_spivar.h>
@@ -250,8 +249,7 @@ static int
bcm_spi_attach(device_t dev)
{
struct bcm_spi_softc *sc;
- device_t gpio;
- int i, rid;
+ int rid;
if (device_get_unit(dev) != 0) {
device_printf(dev, "only one SPI controller supported\n");
@@ -260,15 +258,6 @@ bcm_spi_attach(device_t dev)
sc = device_get_softc(dev);
sc->sc_dev = dev;
-
- /* Configure the GPIO pins to ALT0 function to enable SPI the pins. */
- gpio = devclass_get_device(devclass_find("gpio"), 0);
- if (!gpio) {
- device_printf(dev, "cannot find gpio0\n");
- return (ENXIO);
- }
- for (i = 0; i < nitems(bcm_spi_pins); i++)
- bcm_gpio_set_alternate(gpio, bcm_spi_pins[i], BCM_GPIO_ALT0);
rid = 0;
sc->sc_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
Modified: head/sys/arm/broadcom/bcm2835/bcm2835_spivar.h
==============================================================================
--- head/sys/arm/broadcom/bcm2835/bcm2835_spivar.h Sat Apr 7 23:31:55
2018 (r332261)
+++ head/sys/arm/broadcom/bcm2835/bcm2835_spivar.h Sun Apr 8 00:56:19
2018 (r332262)
@@ -32,18 +32,6 @@
#ifndef _BCM2835_SPIVAR_H_
#define _BCM2835_SPIVAR_H_
-/*
- * Only the available pins are listed here.
- * i.e. CS2 isn't available.
- */
-uint32_t bcm_spi_pins[] = {
- 7, /* CS1 */
- 8, /* CS0 */
- 9, /* MISO */
- 10, /* MOSI */
- 11 /* SCLK */
-};
-
struct bcm_spi_softc {
device_t sc_dev;
struct mtx sc_mtx;
Modified: head/sys/arm/broadcom/bcm2835/bcm2836.c
==============================================================================
--- head/sys/arm/broadcom/bcm2835/bcm2836.c Sat Apr 7 23:31:55 2018
(r332261)
+++ head/sys/arm/broadcom/bcm2835/bcm2836.c Sun Apr 8 00:56:19 2018
(r332262)
@@ -736,4 +736,4 @@ static driver_t bcm_lintc_driver = {
static devclass_t bcm_lintc_devclass;
EARLY_DRIVER_MODULE(local_intc, simplebus, bcm_lintc_driver,
bcm_lintc_devclass,
- 0, 0, BUS_PASS_INTERRUPT + BUS_PASS_ORDER_MIDDLE);
+ 0, 0, BUS_PASS_INTERRUPT);
Modified: head/sys/arm/conf/RPI-B
==============================================================================
--- head/sys/arm/conf/RPI-B Sat Apr 7 23:31:55 2018 (r332261)
+++ head/sys/arm/conf/RPI-B Sun Apr 8 00:56:19 2018 (r332262)
@@ -90,6 +90,8 @@ device bcm2835_spi
device vchiq
device sound
+device fdt_pinctrl
+
# Flattened Device Tree
options FDT # Configure using FDT/DTB data
# Note: DTB is normally loaded and modified by RPi boot loader, then
Modified: head/sys/arm/conf/RPI2
==============================================================================
--- head/sys/arm/conf/RPI2 Sat Apr 7 23:31:55 2018 (r332261)
+++ head/sys/arm/conf/RPI2 Sun Apr 8 00:56:19 2018 (r332262)
@@ -93,6 +93,8 @@ device bcm2835_spi
device vchiq
device sound
+device fdt_pinctrl
+
# Flattened Device Tree
options FDT # Configure using FDT/DTB data
# Note: DTB is normally loaded and modified by RPi boot loader, then
Modified: head/sys/dts/arm/rpi.dts
==============================================================================
--- head/sys/dts/arm/rpi.dts Sat Apr 7 23:31:55 2018 (r332261)
+++ head/sys/dts/arm/rpi.dts Sun Apr 8 00:56:19 2018 (r332262)
@@ -53,6 +53,10 @@
spi@7e204000 {
status = "okay";
+ pinctrl-names = "default";
+ pinctrl-0 = <&spi0_pins &spi0_cs_pins>;
+ pinctrl-names = "default";
+ pinctrl-0 = <&spi0_pins &spi0_cs_pins>;
};
gpio@7e200000 {
@@ -67,6 +71,16 @@
broadcom,pins = <48>, <49>, <50>, <51>, <52>,
<53>;
};
+
+ spi0_pins: spi0_pins {
+ brcm,pins = <9 10 11>;
+ brcm,function = <4>; /* alt0 */
+ };
+
+ spi0_cs_pins: spi0_cs_pins {
+ brcm,pins = <8 7>;
+ brcm,function = <1>; /* output */
+ };
}
vchiq {
@@ -89,4 +103,3 @@
};
};
-
Modified: head/sys/dts/arm/rpi2.dts
==============================================================================
--- head/sys/dts/arm/rpi2.dts Sat Apr 7 23:31:55 2018 (r332261)
+++ head/sys/dts/arm/rpi2.dts Sun Apr 8 00:56:19 2018 (r332262)
@@ -53,6 +53,8 @@
spi@7e204000 {
status = "okay";
+ pinctrl-names = "default";
+ pinctrl-0 = <&spi0_pins &spi0_cs_pins>;
};
gpio@7e200000 {
@@ -66,6 +68,16 @@
pins_reserved: reserved {
broadcom,pins = <48>, <49>, <50>, <51>, <52>,
<53>;
+ };
+
+ spi0_pins: spi0_pins {
+ brcm,pins = <9 10 11>;
+ brcm,function = <4>; /* alt0 */
+ };
+
+ spi0_cs_pins: spi0_cs_pins {
+ brcm,pins = <8 7>;
+ brcm,function = <1>; /* output */
};
}
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