This patch adds a pin controller driver supporting devices using a single configuration register per pin.
Signed-off-by: Felix Brack fb@ltec.ch [james@balean.com.au: changed .set_state_simple operation to .set_state] Signed-off-by: James Balean james@balean.com.au --- drivers/pinctrl/Kconfig | 10 +++ drivers/pinctrl/Makefile | 1 + drivers/pinctrl/pinctrl-single.c | 141 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 152 insertions(+) create mode 100644 drivers/pinctrl/pinctrl-single.c
diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig index efcb4c0..a2b9212 100644 --- a/drivers/pinctrl/Kconfig +++ b/drivers/pinctrl/Kconfig @@ -175,6 +175,16 @@ config PIC32_PINCTRL by a device tree node which contains both GPIO defintion and pin control functions.
+config PINCTRL_SINGLE + bool "Single register pin-control and pin-multiplex driver" + depends on PINCTRL_FULL || SPL_PINCTRL_FULL + help + This enables pinctrl driver for systems using a single register for + pin configuration and multiplexing. TI's AM335X SoCs are examples of + such systems. + Depending on the platform make sure to also enable OF_TRANSLATE and + eventually SPL_OF_TRANSLATE to get correct address translations. + endif
source "drivers/pinctrl/meson/Kconfig" diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile index 512112a..f148f94 100644 --- a/drivers/pinctrl/Makefile +++ b/drivers/pinctrl/Makefile @@ -16,3 +16,4 @@ obj-$(CONFIG_PIC32_PINCTRL) += pinctrl_pic32.o obj-$(CONFIG_PINCTRL_EXYNOS) += exynos/ obj-$(CONFIG_PINCTRL_MESON) += meson/ obj-$(CONFIG_PINCTRL_MVEBU) += mvebu/ +obj-$(CONFIG_PINCTRL_SINGLE) += pinctrl-single.o diff --git a/drivers/pinctrl/pinctrl-single.c b/drivers/pinctrl/pinctrl-single.c new file mode 100644 index 0000000..a5b4d75 --- /dev/null +++ b/drivers/pinctrl/pinctrl-single.c @@ -0,0 +1,141 @@ +/* + * Copyright (C) EETS GmbH, 2017, Felix Brack f.brack@eets.ch + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <dm/device.h> +#include <dm/pinctrl.h> +#include <libfdt.h> +#include <asm/io.h> + +DECLARE_GLOBAL_DATA_PTR; + +struct single_pdata { + fdt_addr_t base; /* first configuration register */ + int offset; /* index of last configuration register */ + u32 mask; /* configuration-value mask bits */ + int width; /* configuration register bit width */ +}; + +struct single_fdt_pin_cfg { + fdt32_t reg; /* configuration register offset */ + fdt32_t val; /* configuration register value */ +}; + +/** + * single_configure_pins() - Configure pins based on FDT data + * + * @dev: Pointer to single pin configuration device which is the parent of + * the pins node holding the pin configuration data. + * @pins: Pointer to the first element of an array of register/value pairs + * of type 'struct single_fdt_pin_cfg'. Each such pair describes the + * the pin to be configured and the value to be used for configuration. + * This pointer points to a 'pinctrl-single,pins' property in the + * device-tree. + * @size: Size of the 'pins' array in bytes. + * The number of register/value pairs in the 'pins' array therefore + * equals to 'size / sizeof(struct single_fdt_pin_cfg)'. + */ +static int single_configure_pins(struct udevice *dev, + const struct single_fdt_pin_cfg *pins, + int size) +{ + struct single_pdata *pdata = dev->platdata; + int count = size / sizeof(struct single_fdt_pin_cfg); + int n, reg; + u32 val; + + for (n = 0; n < count; n++) { + reg = fdt32_to_cpu(pins->reg); + if ((reg < 0) || (reg > pdata->offset)) { + dev_dbg(dev, " invalid register offset 0x%08x\n", reg); + pins++; + continue; + } + reg += pdata->base; + switch (pdata->width) { + case 32: + val = readl(reg) & ~pdata->mask; + val |= fdt32_to_cpu(pins->val) & pdata->mask; + writel(val, reg); + dev_dbg(dev, " reg/val 0x%08x/0x%08x\n", + reg, val); + break; + default: + dev_warn(dev, "unsupported register width %i\n", + pdata->width); + } + pins++; + } + return 0; +} + +static int single_set_state(struct udevice *dev, struct udevice *config) +{ + const void *fdt = gd->fdt_blob; + const struct single_fdt_pin_cfg *prop; + int len; + + prop = fdt_getprop(fdt, config->of_offset, "pinctrl-single,pins", &len); + if (prop) { + dev_dbg(dev, "configuring pins for %s\n", config->name); + if (len % sizeof(struct single_fdt_pin_cfg)) { + dev_dbg(dev, " invalid pin configuration in fdt\n"); + return -FDT_ERR_BADSTRUCTURE; + } + single_configure_pins(dev, prop, len); + len = 0; + } + + return len; +} + +static int single_ofdata_to_platdata(struct udevice *dev) +{ + fdt_addr_t addr; + u32 of_reg[2]; + int res; + struct single_pdata *pdata = dev->platdata; + + pdata->width = fdtdec_get_int(gd->fdt_blob, dev->of_offset, + "pinctrl-single,register-width", 0); + + res = fdtdec_get_int_array(gd->fdt_blob, dev->of_offset, + "reg", of_reg, 2); + if (res) + return res; + pdata->offset = of_reg[1] - pdata->width / 8; + + addr = dev_get_addr(dev); + if (addr == FDT_ADDR_T_NONE) { + dev_dbg(dev, "no valid base register address\n"); + return -EINVAL; + } + pdata->base = addr; + + pdata->mask = fdtdec_get_int(gd->fdt_blob, dev->of_offset, + "pinctrl-single,function-mask", + 0xffffffff); + return 0; +} + +const struct pinctrl_ops single_pinctrl_ops = { + .set_state = single_set_state, +}; + +static const struct udevice_id single_pinctrl_match[] = { + { .compatible = "pinctrl-single" }, + { /* sentinel */ } +}; + +U_BOOT_DRIVER(single_pinctrl) = { + .name = "single-pinctrl", + .id = UCLASS_PINCTRL, + .of_match = single_pinctrl_match, + .ops = &single_pinctrl_ops, + .flags = DM_FLAG_PRE_RELOC, + .platdata_auto_alloc_size = sizeof(struct single_pdata), + .ofdata_to_platdata = single_ofdata_to_platdata, +};