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Code Issues Releases Activity

arm64: a37x0_gpio: Use syscon instead of MMIO region

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The fdt node for this driver is a simple-mfd and syscon compatible one
meaning that simplemfd will be the driver attached for it. The gpio driver
is attached to the 'gpio' subnode so use syscon_get_handle_default to
obtain the handle of the syscon from the parent device and use this
to read/write to the memory region.

MFC after:	1 week
This commit is contained in:
Emmanuel Vadot 2019-08-19 14:28:54 +00:00
parent 818f498f29
commit cf2ba452a0
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=351217
1 changed files with 10 additions and 19 deletions
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29
sys/arm/mv/a37x0_gpio.c
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@ -46,21 +46,14 @@ __FBSDID("$FreeBSD$");
#include <dev/ofw/ofw_bus_subr.h>
#include "gpio_if.h"
static struct resource_spec a37x0_gpio_res_spec[] = {
{ SYS_RES_MEMORY, 0, RF_ACTIVE }, /* Pinctl / GPIO */
{ SYS_RES_MEMORY, 1, RF_ACTIVE }, /* Interrupts control */
{ -1, 0, 0 }
};
#include "syscon_if.h"
struct a37x0_gpio_softc {
bus_space_tag_t sc_bst;
bus_space_handle_t sc_bsh;
device_t sc_busdev;
int sc_type;
uint32_t sc_max_pins;
uint32_t sc_npins;
struct resource *sc_mem_res[nitems(a37x0_gpio_res_spec) - 1];
struct syscon *syscon;
};
/* Memory regions. */
@ -72,9 +65,9 @@ struct a37x0_gpio_softc {
#define A37X0_SB_GPIO 2
#define A37X0_GPIO_WRITE(_sc, _off, _val) \
bus_space_write_4((_sc)->sc_bst, (_sc)->sc_bsh, (_off), (_val))
SYSCON_WRITE_4((_sc)->syscon, (_off), (_val))
#define A37X0_GPIO_READ(_sc, _off) \
bus_space_read_4((_sc)->sc_bst, (_sc)->sc_bsh, (_off))
SYSCON_READ_4((_sc)->syscon, (_off))
#define A37X0_GPIO_BIT(_p) (1U << ((_p) % 32))
#define A37X0_GPIO_OUT_EN(_p) (0x0 + ((_p) / 32) * 4)
@ -280,6 +273,12 @@ a37x0_gpio_attach(device_t dev)
sc = device_get_softc(dev);
err = syscon_get_handle_default(dev, &sc->syscon);
if (err != 0) {
device_printf(dev, "Cannot get syscon handle from parent\n");
return (ENXIO);
}
/* Read and verify the "gpio-ranges" property. */
ncells = OF_getencprop_alloc(ofw_bus_get_node(dev), "gpio-ranges",
(void **)&ranges);
@ -296,14 +295,6 @@ a37x0_gpio_attach(device_t dev)
if (sc->sc_npins > sc->sc_max_pins)
return (ENXIO);
err = bus_alloc_resources(dev, a37x0_gpio_res_spec, sc->sc_mem_res);
if (err != 0) {
device_printf(dev, "cannot allocate memory window\n");
return (ENXIO);
}
sc->sc_bst = rman_get_bustag(sc->sc_mem_res[A37X0_GPIO]);
sc->sc_bsh = rman_get_bushandle(sc->sc_mem_res[A37X0_GPIO]);
sc->sc_busdev = gpiobus_attach_bus(dev);
if (sc->sc_busdev == NULL)
return (ENXIO);