From: Jim Liu Date: Mon, 29 Jul 2024 08:51:03 +0000 (+0800) Subject: gpio: npcm: Add SGPIO support for Nuvoton NPCM SoCs X-Git-Url: http://git.dujemihanovic.xyz/%22http:/www.sics.se/static/git-favicon.png?a=commitdiff_plain;h=7c17f02283d57c529a5736a602050ec3524cd509;p=u-boot.git gpio: npcm: Add SGPIO support for Nuvoton NPCM SoCs Add Nuvoton BMC NPCM7xx/NPCM8xx sgpio driver. BMC can use this driver to increase 64 GPI pins and 64 GPO pins to use. Signed-off-by: Jim Liu --- diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index fcca6941eb..d735877cd9 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -301,6 +301,15 @@ config NPCM_GPIO Support GPIO controllers on Nuvovon NPCM SoCs. NPCM7xx/NPCM8xx contain 8 GPIO banks, each bank contains 32 pins. +config NPCM_SGPIO + bool "Nuvoton NPCM SGPIO driver" + depends on DM_GPIO + help + Support Nuvoton BMC NPCM7xx/NPCM8xx sgpio driver support. + Nuvoton NPCM SGPIO module is combine serial to parallel IC (HC595) + and parallel to serial IC (HC165). + BMC can use this driver to increase 64 GPI pins and 64 GPO pins to use. + config OMAP_GPIO bool "TI OMAP GPIO driver" depends on ARCH_OMAP2PLUS diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index 4a29315435..cc54df4046 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -27,6 +27,7 @@ obj-$(CONFIG_$(SPL_TPL_)MCP230XX_GPIO) += mcp230xx_gpio.o obj-$(CONFIG_MXC_GPIO) += mxc_gpio.o obj-$(CONFIG_MXS_GPIO) += mxs_gpio.o obj-$(CONFIG_NPCM_GPIO) += npcm_gpio.o +obj-$(CONFIG_NPCM_SGPIO) += npcm_sgpio.o obj-$(CONFIG_PCA953X) += pca953x.o obj-$(CONFIG_ROCKCHIP_GPIO) += rk_gpio.o obj-$(CONFIG_RCAR_GPIO) += gpio-rcar.o diff --git a/drivers/gpio/npcm_sgpio.c b/drivers/gpio/npcm_sgpio.c new file mode 100644 index 0000000000..6d73287c0a --- /dev/null +++ b/drivers/gpio/npcm_sgpio.c @@ -0,0 +1,291 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (c) 2024 Nuvoton Technology Corp. + */ + +#include +#include +#include + +#define MAX_NR_HW_SGPIO 64 +#define NPCM_CLK_MHZ 8000000 + +#define NPCM_IOXCFG1 0x2A + +#define NPCM_IOXCTS 0x28 +#define NPCM_IOXCTS_IOXIF_EN BIT(7) +#define NPCM_IOXCTS_RD_MODE GENMASK(2, 1) +#define NPCM_IOXCTS_RD_MODE_PERIODIC BIT(2) + +#define NPCM_IOXCFG2 0x2B +#define NPCM_IOXCFG2_PORT GENMASK(3, 0) + +#define GPIO_BANK(x) ((x) / 8) +#define GPIO_BIT(x) ((x) % 8) + +struct npcm_sgpio_priv { + void __iomem *base; + u32 nin_sgpio; + u32 nout_sgpio; + u32 in_port; + u32 out_port; +}; + +struct npcm_sgpio_bank { + u8 rdata_reg; + u8 wdata_reg; + u8 event_config; + u8 event_status; +}; + +enum npcm_sgpio_reg { + READ_DATA, + WRITE_DATA, + EVENT_CFG, + EVENT_STS, +}; + +static const struct npcm_sgpio_bank npcm_sgpio_banks[] = { + { + .wdata_reg = 0x00, + .rdata_reg = 0x08, + .event_config = 0x10, + .event_status = 0x20, + }, + { + .wdata_reg = 0x01, + .rdata_reg = 0x09, + .event_config = 0x12, + .event_status = 0x21, + }, + { + .wdata_reg = 0x02, + .rdata_reg = 0x0a, + .event_config = 0x14, + .event_status = 0x22, + }, + { + .wdata_reg = 0x03, + .rdata_reg = 0x0b, + .event_config = 0x16, + .event_status = 0x23, + }, + { + .wdata_reg = 0x04, + .rdata_reg = 0x0c, + .event_config = 0x18, + .event_status = 0x24, + }, + { + .wdata_reg = 0x05, + .rdata_reg = 0x0d, + .event_config = 0x1a, + .event_status = 0x25, + }, + { + .wdata_reg = 0x06, + .rdata_reg = 0x0e, + .event_config = 0x1c, + .event_status = 0x26, + }, + { + .wdata_reg = 0x07, + .rdata_reg = 0x0f, + .event_config = 0x1e, + .event_status = 0x27, + }, +}; + +static void __iomem *bank_reg(struct npcm_sgpio_priv *gpio, + const struct npcm_sgpio_bank *bank, + const enum npcm_sgpio_reg reg) +{ + switch (reg) { + case READ_DATA: + return gpio->base + bank->rdata_reg; + case WRITE_DATA: + return gpio->base + bank->wdata_reg; + case EVENT_CFG: + return gpio->base + bank->event_config; + case EVENT_STS: + return gpio->base + bank->event_status; + default: + /* actually if code runs to here, it's an error case */ + printf("Getting here is an error condition\n"); + return NULL; + } +} + +static const struct npcm_sgpio_bank *offset_to_bank(unsigned int offset) +{ + unsigned int bank = GPIO_BANK(offset); + + return &npcm_sgpio_banks[bank]; +} + +static int npcm_sgpio_direction_input(struct udevice *dev, unsigned int offset) +{ + struct npcm_sgpio_priv *priv = dev_get_priv(dev); + + if (offset < priv->nout_sgpio) { + printf("Error: Offset %d is a output pin\n", offset); + return -EINVAL; + } + + return 0; +} + +static int npcm_sgpio_direction_output(struct udevice *dev, unsigned int offset, + int value) +{ + struct npcm_sgpio_priv *priv = dev_get_priv(dev); + const struct npcm_sgpio_bank *bank = offset_to_bank(offset); + void __iomem *addr; + u8 reg = 0; + + if (offset >= priv->nout_sgpio) { + printf("Error: Offset %d is a input pin\n", offset); + return -EINVAL; + } + + addr = bank_reg(priv, bank, WRITE_DATA); + reg = ioread8(addr); + + if (value) + reg |= BIT(GPIO_BIT(offset)); + else + reg &= ~BIT(GPIO_BIT(offset)); + + iowrite8(reg, addr); + + return 0; +} + +static int npcm_sgpio_get_value(struct udevice *dev, unsigned int offset) +{ + struct npcm_sgpio_priv *priv = dev_get_priv(dev); + const struct npcm_sgpio_bank *bank; + void __iomem *addr; + u8 reg; + + if (offset < priv->nout_sgpio) { + bank = offset_to_bank(offset); + addr = bank_reg(priv, bank, WRITE_DATA); + } else { + offset -= priv->nout_sgpio; + bank = offset_to_bank(offset); + addr = bank_reg(priv, bank, READ_DATA); + } + + reg = ioread8(addr); + + return !!(reg & BIT(GPIO_BIT(offset))); +} + +static int npcm_sgpio_set_value(struct udevice *dev, unsigned int offset, + int value) +{ + return npcm_sgpio_direction_output(dev, offset, value); +} + +static int npcm_sgpio_get_function(struct udevice *dev, unsigned int offset) +{ + struct npcm_sgpio_priv *priv = dev_get_priv(dev); + + if (offset < priv->nout_sgpio) + return GPIOF_OUTPUT; + + return GPIOF_INPUT; +} + +static void npcm_sgpio_setup_enable(struct npcm_sgpio_priv *gpio, bool enable) +{ + u8 reg; + + reg = ioread8(gpio->base + NPCM_IOXCTS); + reg = (reg & ~NPCM_IOXCTS_RD_MODE) | NPCM_IOXCTS_RD_MODE_PERIODIC; + + if (enable) + reg |= NPCM_IOXCTS_IOXIF_EN; + else + reg &= ~NPCM_IOXCTS_IOXIF_EN; + + iowrite8(reg, gpio->base + NPCM_IOXCTS); +} + +static int npcm_sgpio_init_port(struct udevice *dev) +{ + struct npcm_sgpio_priv *priv = dev_get_priv(dev); + u8 in_port, out_port, set_port, reg, set_clk; + + npcm_sgpio_setup_enable(priv, false); + + in_port = GPIO_BANK(priv->nin_sgpio); + if (GPIO_BIT(priv->nin_sgpio) > 0) + in_port += 1; + + out_port = GPIO_BANK(priv->nout_sgpio); + if (GPIO_BIT(priv->nout_sgpio) > 0) + out_port += 1; + + priv->in_port = in_port; + priv->out_port = out_port; + + set_port = (out_port & NPCM_IOXCFG2_PORT) << 4 | (in_port & NPCM_IOXCFG2_PORT); + set_clk = 0x07; + + iowrite8(set_port, priv->base + NPCM_IOXCFG2); + iowrite8(set_clk, priv->base + NPCM_IOXCFG1); + + reg = ioread8(priv->base + NPCM_IOXCFG2); + + return reg == set_port ? 0 : -EINVAL; +} + +static const struct dm_gpio_ops npcm_sgpio_ops = { + .direction_input = npcm_sgpio_direction_input, + .direction_output = npcm_sgpio_direction_output, + .get_value = npcm_sgpio_get_value, + .set_value = npcm_sgpio_set_value, + .get_function = npcm_sgpio_get_function, +}; + +static int npcm_sgpio_probe(struct udevice *dev) +{ + struct npcm_sgpio_priv *priv = dev_get_priv(dev); + struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev); + int rc; + + priv->base = dev_read_addr_ptr(dev); + ofnode_read_u32(dev_ofnode(dev), "nuvoton,input-ngpios", &priv->nin_sgpio); + ofnode_read_u32(dev_ofnode(dev), "nuvoton,output-ngpios", &priv->nout_sgpio); + + if (priv->nin_sgpio > MAX_NR_HW_SGPIO || priv->nout_sgpio > MAX_NR_HW_SGPIO) + return -EINVAL; + + rc = npcm_sgpio_init_port(dev); + if (rc < 0) + return rc; + + uc_priv->gpio_count = priv->nin_sgpio + priv->nout_sgpio; + uc_priv->bank_name = dev->name; + + npcm_sgpio_setup_enable(priv, true); + + return 0; +} + +static const struct udevice_id npcm_sgpio_match[] = { + { .compatible = "nuvoton,npcm845-sgpio" }, + { .compatible = "nuvoton,npcm750-sgpio" }, + { } +}; + +U_BOOT_DRIVER(npcm_sgpio) = { + .name = "npcm_sgpio", + .id = UCLASS_GPIO, + .of_match = npcm_sgpio_match, + .probe = npcm_sgpio_probe, + .priv_auto = sizeof(struct npcm_sgpio_priv), + .ops = &npcm_sgpio_ops, +};