| Message ID | 20210713032345.2571-5-green.wan@sifive.com |
|---|---|
| State | Accepted |
| Headers | show |
| Series | GPIO reset support | expand |
On Tue, Jul 13, 2021 at 8:54 AM Green Wan <green.wan@sifive.com> wrote: > > We add a minimal SiFive GPIO driver so that we can do GPIO based > system power-off and reset. > > Signed-off-by: Green Wan <green.wan@sifive.com> > Signed-off-by: Anup Patel <anup.patel@wdc.com> I have added a missing reviewed-by from Atish at time of merging. Applied this patch to the riscv/opensbi repo Thanks, Anup > --- > lib/utils/gpio/fdt_gpio.c | 3 + > lib/utils/gpio/fdt_gpio_sifive.c | 105 +++++++++++++++++++++++++++++++ > lib/utils/gpio/objects.mk | 1 + > 3 files changed, 109 insertions(+) > create mode 100644 lib/utils/gpio/fdt_gpio_sifive.c > > diff --git a/lib/utils/gpio/fdt_gpio.c b/lib/utils/gpio/fdt_gpio.c > index bff391f..297b248 100644 > --- a/lib/utils/gpio/fdt_gpio.c > +++ b/lib/utils/gpio/fdt_gpio.c > @@ -12,7 +12,10 @@ > #include <sbi_utils/fdt/fdt_helper.h> > #include <sbi_utils/gpio/fdt_gpio.h> > > +extern struct fdt_gpio fdt_gpio_sifive; > + > static struct fdt_gpio *gpio_drivers[] = { > + &fdt_gpio_sifive > }; > > static struct fdt_gpio *fdt_gpio_driver(struct gpio_chip *chip) > diff --git a/lib/utils/gpio/fdt_gpio_sifive.c b/lib/utils/gpio/fdt_gpio_sifive.c > new file mode 100644 > index 0000000..abc9d72 > --- /dev/null > +++ b/lib/utils/gpio/fdt_gpio_sifive.c > @@ -0,0 +1,105 @@ > +/* > + * SPDX-License-Identifier: BSD-2-Clause > + * > + * Copyright (c) 2021 SiFive > + * > + * Authors: > + * Green Wan <green.wan@sifive.com> > + */ > + > +#include <sbi/riscv_io.h> > +#include <sbi/sbi_error.h> > +#include <sbi_utils/fdt/fdt_helper.h> > +#include <sbi_utils/gpio/fdt_gpio.h> > + > +#define SIFIVE_GPIO_CHIP_MAX 2 > + > +#define SIFIVE_GPIO_PINS_MIN 1 > +#define SIFIVE_GPIO_PINS_MAX 32 > +#define SIFIVE_GPIO_PINS_DEF 16 > + > +#define SIFIVE_GPIO_OUTEN 0x8 > +#define SIFIVE_GPIO_OUTVAL 0xc > +#define SIFIVE_GPIO_BIT(b) (1U << (b)) > + > +struct sifive_gpio_chip { > + unsigned long addr; > + struct gpio_chip chip; > +}; > + > +static unsigned int sifive_gpio_chip_count; > +static struct sifive_gpio_chip sifive_gpio_chip_array[SIFIVE_GPIO_CHIP_MAX]; > + > +static int sifive_gpio_direction_output(struct gpio_pin *gp, int value) > +{ > + unsigned int v; > + struct sifive_gpio_chip *chip = > + container_of(gp->chip, struct sifive_gpio_chip, chip); > + > + v = readl((volatile void *)(chip->addr + SIFIVE_GPIO_OUTEN)); > + v |= SIFIVE_GPIO_BIT(gp->offset); > + writel(v, (volatile void *)(chip->addr + SIFIVE_GPIO_OUTEN)); > + > + v = readl((volatile void *)(chip->addr + SIFIVE_GPIO_OUTVAL)); > + if (!value) > + v &= ~SIFIVE_GPIO_BIT(gp->offset); > + else > + v |= SIFIVE_GPIO_BIT(gp->offset); > + writel(v, (volatile void *)(chip->addr + SIFIVE_GPIO_OUTVAL)); > + > + return 0; > +} > + > +static void sifive_gpio_set(struct gpio_pin *gp, int value) > +{ > + unsigned int v; > + struct sifive_gpio_chip *chip = > + container_of(gp->chip, struct sifive_gpio_chip, chip); > + > + v = readl((volatile void *)(chip->addr + SIFIVE_GPIO_OUTVAL)); > + if (!value) > + v &= ~SIFIVE_GPIO_BIT(gp->offset); > + else > + v |= SIFIVE_GPIO_BIT(gp->offset); > + writel(v, (volatile void *)(chip->addr + SIFIVE_GPIO_OUTVAL)); > +} > + > +extern struct fdt_gpio fdt_gpio_sifive; > + > +static int sifive_gpio_init(void *fdt, int nodeoff, u32 phandle, > + const struct fdt_match *match) > +{ > + int rc; > + struct sifive_gpio_chip *chip; > + > + if (SIFIVE_GPIO_CHIP_MAX <= sifive_gpio_chip_count) > + return SBI_ENOSPC; > + chip = &sifive_gpio_chip_array[sifive_gpio_chip_count]; > + > + rc = fdt_get_node_addr_size(fdt, nodeoff, &chip->addr, NULL); > + if (rc) > + return rc; > + > + chip->chip.driver = &fdt_gpio_sifive; > + chip->chip.id = phandle; > + chip->chip.ngpio = SIFIVE_GPIO_PINS_DEF; > + chip->chip.direction_output = sifive_gpio_direction_output; > + chip->chip.set = sifive_gpio_set; > + rc = gpio_chip_add(&chip->chip); > + if (rc) > + return rc; > + > + sifive_gpio_chip_count++; > + return 0; > +} > + > +static const struct fdt_match sifive_gpio_match[] = { > + { .compatible = "sifive,gpio0" }, > + { }, > +}; > + > +struct fdt_gpio fdt_gpio_sifive = { > + .match_table = sifive_gpio_match, > + .xlate = fdt_gpio_simple_xlate, > + .init = sifive_gpio_init, > +}; > diff --git a/lib/utils/gpio/objects.mk b/lib/utils/gpio/objects.mk > index dade45e..8eb7736 100644 > --- a/lib/utils/gpio/objects.mk > +++ b/lib/utils/gpio/objects.mk > @@ -8,4 +8,5 @@ > # > > libsbiutils-objs-y += gpio/fdt_gpio.o > +libsbiutils-objs-y += gpio/fdt_gpio_sifive.o > libsbiutils-objs-y += gpio/gpio.o > -- > 2.17.1 > > > -- > opensbi mailing list > opensbi@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/opensbi
diff --git a/lib/utils/gpio/fdt_gpio.c b/lib/utils/gpio/fdt_gpio.c index bff391f..297b248 100644 --- a/lib/utils/gpio/fdt_gpio.c +++ b/lib/utils/gpio/fdt_gpio.c @@ -12,7 +12,10 @@ #include <sbi_utils/fdt/fdt_helper.h> #include <sbi_utils/gpio/fdt_gpio.h> +extern struct fdt_gpio fdt_gpio_sifive; + static struct fdt_gpio *gpio_drivers[] = { + &fdt_gpio_sifive }; static struct fdt_gpio *fdt_gpio_driver(struct gpio_chip *chip) diff --git a/lib/utils/gpio/fdt_gpio_sifive.c b/lib/utils/gpio/fdt_gpio_sifive.c new file mode 100644 index 0000000..abc9d72 --- /dev/null +++ b/lib/utils/gpio/fdt_gpio_sifive.c @@ -0,0 +1,105 @@ +/* + * SPDX-License-Identifier: BSD-2-Clause + * + * Copyright (c) 2021 SiFive + * + * Authors: + * Green Wan <green.wan@sifive.com> + */ + +#include <sbi/riscv_io.h> +#include <sbi/sbi_error.h> +#include <sbi_utils/fdt/fdt_helper.h> +#include <sbi_utils/gpio/fdt_gpio.h> + +#define SIFIVE_GPIO_CHIP_MAX 2 + +#define SIFIVE_GPIO_PINS_MIN 1 +#define SIFIVE_GPIO_PINS_MAX 32 +#define SIFIVE_GPIO_PINS_DEF 16 + +#define SIFIVE_GPIO_OUTEN 0x8 +#define SIFIVE_GPIO_OUTVAL 0xc +#define SIFIVE_GPIO_BIT(b) (1U << (b)) + +struct sifive_gpio_chip { + unsigned long addr; + struct gpio_chip chip; +}; + +static unsigned int sifive_gpio_chip_count; +static struct sifive_gpio_chip sifive_gpio_chip_array[SIFIVE_GPIO_CHIP_MAX]; + +static int sifive_gpio_direction_output(struct gpio_pin *gp, int value) +{ + unsigned int v; + struct sifive_gpio_chip *chip = + container_of(gp->chip, struct sifive_gpio_chip, chip); + + v = readl((volatile void *)(chip->addr + SIFIVE_GPIO_OUTEN)); + v |= SIFIVE_GPIO_BIT(gp->offset); + writel(v, (volatile void *)(chip->addr + SIFIVE_GPIO_OUTEN)); + + v = readl((volatile void *)(chip->addr + SIFIVE_GPIO_OUTVAL)); + if (!value) + v &= ~SIFIVE_GPIO_BIT(gp->offset); + else + v |= SIFIVE_GPIO_BIT(gp->offset); + writel(v, (volatile void *)(chip->addr + SIFIVE_GPIO_OUTVAL)); + + return 0; +} + +static void sifive_gpio_set(struct gpio_pin *gp, int value) +{ + unsigned int v; + struct sifive_gpio_chip *chip = + container_of(gp->chip, struct sifive_gpio_chip, chip); + + v = readl((volatile void *)(chip->addr + SIFIVE_GPIO_OUTVAL)); + if (!value) + v &= ~SIFIVE_GPIO_BIT(gp->offset); + else + v |= SIFIVE_GPIO_BIT(gp->offset); + writel(v, (volatile void *)(chip->addr + SIFIVE_GPIO_OUTVAL)); +} + +extern struct fdt_gpio fdt_gpio_sifive; + +static int sifive_gpio_init(void *fdt, int nodeoff, u32 phandle, + const struct fdt_match *match) +{ + int rc; + struct sifive_gpio_chip *chip; + + if (SIFIVE_GPIO_CHIP_MAX <= sifive_gpio_chip_count) + return SBI_ENOSPC; + chip = &sifive_gpio_chip_array[sifive_gpio_chip_count]; + + rc = fdt_get_node_addr_size(fdt, nodeoff, &chip->addr, NULL); + if (rc) + return rc; + + chip->chip.driver = &fdt_gpio_sifive; + chip->chip.id = phandle; + chip->chip.ngpio = SIFIVE_GPIO_PINS_DEF; + chip->chip.direction_output = sifive_gpio_direction_output; + chip->chip.set = sifive_gpio_set; + rc = gpio_chip_add(&chip->chip); + if (rc) + return rc; + + sifive_gpio_chip_count++; + return 0; +} + +static const struct fdt_match sifive_gpio_match[] = { + { .compatible = "sifive,gpio0" }, + { }, +}; + +struct fdt_gpio fdt_gpio_sifive = { + .match_table = sifive_gpio_match, + .xlate = fdt_gpio_simple_xlate, + .init = sifive_gpio_init, +}; diff --git a/lib/utils/gpio/objects.mk b/lib/utils/gpio/objects.mk index dade45e..8eb7736 100644 --- a/lib/utils/gpio/objects.mk +++ b/lib/utils/gpio/objects.mk @@ -8,4 +8,5 @@ # libsbiutils-objs-y += gpio/fdt_gpio.o +libsbiutils-objs-y += gpio/fdt_gpio_sifive.o libsbiutils-objs-y += gpio/gpio.o