From patchwork Tue Jan 10 08:32:36 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jim Liu X-Patchwork-Id: 641491 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D00B1C46467 for ; Tue, 10 Jan 2023 08:32:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231642AbjAJIc5 (ORCPT ); Tue, 10 Jan 2023 03:32:57 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55422 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231172AbjAJIcz (ORCPT ); Tue, 10 Jan 2023 03:32:55 -0500 Received: from mail-pf1-x429.google.com (mail-pf1-x429.google.com [IPv6:2607:f8b0:4864:20::429]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 61B074730E; Tue, 10 Jan 2023 00:32:54 -0800 (PST) Received: by mail-pf1-x429.google.com with SMTP id c26so3797793pfp.10; Tue, 10 Jan 2023 00:32:54 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=references:in-reply-to:message-id:date:subject:cc:to:from:from:to :cc:subject:date:message-id:reply-to; bh=ZY/L+TjqH9RNGuXTyCJijShPEBEMBjJ/srAsLFR3/zQ=; b=I8qBzbL/GZHMSAw6jjnzwdMWzTJ8t9VuEThnuE6/f13/oQkTT9tDcQB2hHijFrrrCb wjBVF3TWRVFp3lAazDUyaekOrmksIrZPQR4mv6i2D7nnIZkBQilaRO0++TeXYsnmZzxj jxPQVLvoeuo5NE5dLxiRuA3xLi4PKzxmZxtgNPaS13hEi6Y0L0/Gp7Rg+r87oeZXc/KF 4KA8oH2Iqp6dr6WnEATRkgeLcylkOBfJe1VvYHndj+jDp94kZF0MqK4kS+nhy4Bm8r4+ wfA2e8goemMvIgAI999Js6qubd9o79H0q5AYbgD0fVpZ8yEc6nOUAKK6Pui2y//FB3Bm zufw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=references:in-reply-to:message-id:date:subject:cc:to:from :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=ZY/L+TjqH9RNGuXTyCJijShPEBEMBjJ/srAsLFR3/zQ=; b=ipRT8NiKWG4rfaBjcf1729TF6WFUTRsJVl/YqdSF/rEUloGzd0YVBBvXzmptVkQZb0 DOl6P8SW56n0q5AVZv1H+UX1UvjGz7B9v50mCNKZeZ8XZDCm+g9GfGs6InJzO8EWrDgu yzTGjVb78PlU4DG7bjKmlobObmM5DESnGqtwhMT9myO1CucwV/T1MCtLobaIE2NnMXFj mj5fI62IBJCPm9A8BGlYa7erYoLQv0RbKFjtlN0ltAgKSwsUaGaewmjkHvn4oZj9iS+W P5vMHQeZC58uJpl6MDkB/gmIBCrKvxuExK37RIFavNU79z/rxSAjYDg8woegzXaj+Ahl P8Pw== X-Gm-Message-State: AFqh2kpyfTcmXsMg/SMNXBgQT46cCnm6Mmlxq6xzuNzK5uv/ddwTnrOO iOusARd/XSaLUixnNLEyoUg= X-Google-Smtp-Source: AMrXdXtzfZXB5pqhYsKRe856ZY38GOCwuiLBkXxcBS/aPSydi2ZSFuWzS2/Ye8T4r61/pK7Fwrjtlg== X-Received: by 2002:aa7:8a42:0:b0:582:34f2:20f1 with SMTP id n2-20020aa78a42000000b0058234f220f1mr34177446pfa.11.1673339573774; Tue, 10 Jan 2023 00:32:53 -0800 (PST) Received: from localhost.localdomain ([180.217.149.10]) by smtp.gmail.com with ESMTPSA id z3-20020a626503000000b005871b73e27dsm5064950pfb.33.2023.01.10.00.32.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 10 Jan 2023 00:32:53 -0800 (PST) From: Jim Liu To: JJLIU0@nuvoton.com, KWLIU@nuvoton.com, linus.walleij@linaro.org, brgl@bgdev.pl, robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org Cc: linux-gpio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, openbmc@lists.ozlabs.org, Jim Liu Subject: [PATCH v4 1/3] gpio: nuvoton: Add Nuvoton NPCM sgpio driver Date: Tue, 10 Jan 2023 16:32:36 +0800 Message-Id: <20230110083238.19230-2-jim.t90615@gmail.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20230110083238.19230-1-jim.t90615@gmail.com> References: <20230110083238.19230-1-jim.t90615@gmail.com> Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org Add Nuvoton BMC NPCM7xx/NPCM8xx sgpio driver support. Signed-off-by: Jim Liu --- Changes for v4: - followed reviewer suggestion to modify npcm_sgpio_dir_in - blank line in npcm_sgpio_dir_out - use int type for dir in npcm_sgpio_get Changes for v3: - remove return in bank_reg function Changes for v2: - add prefix - write the enum values in all capitals - remove _init in npcm_sgpio_probe --- drivers/gpio/Kconfig | 8 + drivers/gpio/Makefile | 1 + drivers/gpio/gpio-npcm-sgpio.c | 647 +++++++++++++++++++++++++++++++++ 3 files changed, 656 insertions(+) create mode 100644 drivers/gpio/gpio-npcm-sgpio.c diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index ec7cfd4f52b1..c23fff243461 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -470,6 +470,14 @@ config GPIO_MXS select GPIO_GENERIC select GENERIC_IRQ_CHIP +config GPIO_NPCM_SGPIO + bool "Nuvoton SGPIO support" + depends on (ARCH_NPCM || COMPILE_TEST) && OF_GPIO + select GPIO_GENERIC + select GPIOLIB_IRQCHIP + help + Say Y here to support Nuvoton NPCM7XX/NPCM8XX SGPIO functionality. + config GPIO_OCTEON tristate "Cavium OCTEON GPIO" depends on CAVIUM_OCTEON_SOC diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index 010587025fc8..3d7ace40059d 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -111,6 +111,7 @@ obj-$(CONFIG_GPIO_MT7621) += gpio-mt7621.o obj-$(CONFIG_GPIO_MVEBU) += gpio-mvebu.o obj-$(CONFIG_GPIO_MXC) += gpio-mxc.o obj-$(CONFIG_GPIO_MXS) += gpio-mxs.o +obj-$(CONFIG_GPIO_NPCM_SGPIO) += gpio-npcm-sgpio.o obj-$(CONFIG_GPIO_OCTEON) += gpio-octeon.o obj-$(CONFIG_GPIO_OMAP) += gpio-omap.o obj-$(CONFIG_GPIO_PALMAS) += gpio-palmas.o diff --git a/drivers/gpio/gpio-npcm-sgpio.c b/drivers/gpio/gpio-npcm-sgpio.c new file mode 100644 index 000000000000..2083a22a8318 --- /dev/null +++ b/drivers/gpio/gpio-npcm-sgpio.c @@ -0,0 +1,647 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Nuvoton NPCM Serial GPIO Driver + * + * Copyright (C) 2021 Nuvoton Technologies + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define MAX_NR_HW_SGPIO 64 + +#define NPCM_IOXCFG1 0x2A +#define NPCM_IOXCFG1_SFT_CLK GENMASK(3, 0) +#define NPCM_IOXCFG1_SCLK_POL BIT(4) +#define NPCM_IOXCFG1_LDSH_POL BIT(5) + +#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_IOXCTS_RD_MODE_CONTINUOUS GENMASK(2, 1) + +#define NPCM_IOXCFG2 0x2B +#define NPCM_IXOEVCFG_MASK 0x3 +#define NPCM_IXOEVCFG_BOTH 0x3 +#define NPCM_IXOEVCFG_FALLING 0x2 +#define NPCM_IXOEVCFG_RISING 0x1 + +#define GPIO_BANK(x) ((x) / 8) +#define GPIO_BIT(x) ((x) % 8) + +/* + * Select the freqency of shift clock. + * The shift clock is a division of the APB clock. + */ +struct npcm_clk_cfg { + const int *SFT_CLK; + const u8 *CLK_SEL; + const u8 cfg_opt; +}; + +struct npcm_sgpio { + struct gpio_chip chip; + struct clk *pclk; + struct irq_chip intc; + spinlock_t lock; /*protect event config*/ + void __iomem *base; + int irq; + u8 nin_sgpio; + u8 nout_sgpio; + u8 in_port; + u8 out_port; + u8 int_type[MAX_NR_HW_SGPIO]; +}; + +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 *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: + /* acturally if code runs to here, it's an error case */ + WARN(1, "NPCM SGPIO REG SET failed!!\n"); + } +} + +static const struct npcm_sgpio_bank *to_bank(unsigned int offset) +{ + unsigned int bank = GPIO_BANK(offset); + + return &npcm_sgpio_banks[bank]; +} + +static void irqd_to_npcm_sgpio_data(struct irq_data *d, + struct npcm_sgpio **gpio, + const struct npcm_sgpio_bank **bank, + u8 *bit, int *offset) +{ + struct npcm_sgpio *internal; + + *offset = irqd_to_hwirq(d); + internal = irq_data_get_irq_chip_data(d); + WARN_ON(!internal); + + *gpio = internal; + *offset -= internal->nout_sgpio; + *bank = to_bank(*offset); + *bit = GPIO_BIT(*offset); +} + +static int npcm_sgpio_init_port(struct npcm_sgpio *gpio) +{ + u8 in_port, out_port, set_port, reg; + + in_port = gpio->nin_sgpio / 8; + if (gpio->nin_sgpio % 8 > 0) + in_port += 1; + + out_port = gpio->nout_sgpio / 8; + if (gpio->nout_sgpio % 8 > 0) + out_port += 1; + + gpio->in_port = in_port; + gpio->out_port = out_port; + set_port = ((out_port & 0xf) << 4) | (in_port & 0xf); + iowrite8(set_port, gpio->base + NPCM_IOXCFG2); + + reg = ioread8(gpio->base + NPCM_IOXCFG2); + + if (reg == set_port) + return 0; + else + return -EINVAL; + +} + +static int npcm_sgpio_dir_in(struct gpio_chip *gc, unsigned int offset) +{ + struct npcm_sgpio *gpio = gpiochip_get_data(gc); + + return offset < gpio->nout_sgpio ? -EINVAL : 0; +} + +static int npcm_sgpio_dir_out(struct gpio_chip *gc, unsigned int offset, int val) +{ + struct npcm_sgpio *gpio = gpiochip_get_data(gc); + + if (offset < gpio->nout_sgpio) { + gc->set(gc, offset, val); + return 0; + } + + return -EINVAL; +} + +static int npcm_sgpio_get_direction(struct gpio_chip *gc, unsigned int offset) +{ + struct npcm_sgpio *gpio = gpiochip_get_data(gc); + + if (offset < gpio->nout_sgpio) + return 0; + return 1; +} + +static void npcm_sgpio_set(struct gpio_chip *gc, unsigned int offset, int val) +{ + struct npcm_sgpio *gpio = gpiochip_get_data(gc); + const struct npcm_sgpio_bank *bank = to_bank(offset); + void __iomem *addr; + u8 reg = 0; + + addr = bank_reg(gpio, bank, WRITE_DATA); + reg = ioread8(addr); + + if (val) { + reg |= (val << GPIO_BIT(offset)); + iowrite8(reg, addr); + } else { + reg &= ~(1 << GPIO_BIT(offset)); + iowrite8(reg, addr); + } +} + +static int npcm_sgpio_get(struct gpio_chip *gc, unsigned int offset) +{ + struct npcm_sgpio *gpio = gpiochip_get_data(gc); + const struct npcm_sgpio_bank *bank; + void __iomem *addr; + u8 reg; + int dir; + + dir = npcm_sgpio_get_direction(gc, offset); + if (dir == 0) { + bank = to_bank(offset); + + addr = bank_reg(gpio, bank, WRITE_DATA); + reg = ioread8(addr); + reg = (reg >> GPIO_BIT(offset)) & 0x01; + } else { + offset -= gpio->nout_sgpio; + bank = to_bank(offset); + + addr = bank_reg(gpio, bank, READ_DATA); + reg = ioread8(addr); + reg = (reg >> GPIO_BIT(offset)) & 0x01; + } + + return reg; +} + +static void npcm_sgpio_setup_enable(struct npcm_sgpio *gpio, bool enable) +{ + u8 reg = 0; + + reg = ioread8(gpio->base + NPCM_IOXCTS); + reg = reg & ~NPCM_IOXCTS_RD_MODE; + reg = reg | NPCM_IOXCTS_RD_MODE_PERIODIC; + + if (enable) { + reg |= NPCM_IOXCTS_IOXIF_EN; + iowrite8(reg, gpio->base + NPCM_IOXCTS); + } else { + reg &= ~NPCM_IOXCTS_IOXIF_EN; + iowrite8(reg, gpio->base + NPCM_IOXCTS); + } +} + +static int npcm_sgpio_setup_clk(struct npcm_sgpio *gpio, + const struct npcm_clk_cfg *clk_cfg, u32 sgpio_freq) +{ + unsigned long apb_freq; + u32 sgpio_clk_div; + u8 tmp; + int i; + + apb_freq = clk_get_rate(gpio->pclk); + sgpio_clk_div = (apb_freq / sgpio_freq); + if ((apb_freq % sgpio_freq) != 0) + sgpio_clk_div += 1; + + tmp = ioread8(gpio->base + NPCM_IOXCFG1) & ~NPCM_IOXCFG1_SFT_CLK; + + for (i = 0; i < clk_cfg->cfg_opt; i++) { + if (sgpio_clk_div >= clk_cfg->SFT_CLK[i]) { + iowrite8(clk_cfg->CLK_SEL[i] | tmp, gpio->base + NPCM_IOXCFG1); + return 0; + } + } + + return -EINVAL; +} + +static void npcm_sgpio_irq_init_valid_mask(struct gpio_chip *gc, + unsigned long *valid_mask, unsigned int ngpios) +{ + struct npcm_sgpio *gpio = gpiochip_get_data(gc); + int n = gpio->nin_sgpio; + + /* input GPIOs in the high range */ + bitmap_set(valid_mask, gpio->nout_sgpio, n); + bitmap_clear(valid_mask, 0, gpio->nout_sgpio); +} + +static void npcm_sgpio_irq_set_mask(struct irq_data *d, bool set) +{ + const struct npcm_sgpio_bank *bank; + struct npcm_sgpio *gpio; + unsigned long flags; + void __iomem *addr; + int offset; + u16 reg, type; + u8 bit; + + irqd_to_npcm_sgpio_data(d, &gpio, &bank, &bit, &offset); + addr = bank_reg(gpio, bank, EVENT_CFG); + + spin_lock_irqsave(&gpio->lock, flags); + + npcm_sgpio_setup_enable(gpio, false); + + reg = ioread16(addr); + if (set) { + reg &= ~(NPCM_IXOEVCFG_MASK << (bit * 2)); + } else { + type = gpio->int_type[offset]; + reg |= (type << (bit * 2)); + } + + iowrite16(reg, addr); + + npcm_sgpio_setup_enable(gpio, true); + + addr = bank_reg(gpio, bank, EVENT_STS); + reg = ioread8(addr); + reg |= BIT(bit); + iowrite8(reg, addr); + + spin_unlock_irqrestore(&gpio->lock, flags); +} + +static void npcm_sgpio_irq_ack(struct irq_data *d) +{ + const struct npcm_sgpio_bank *bank; + struct npcm_sgpio *gpio; + unsigned long flags; + void __iomem *status_addr; + int offset; + u8 bit; + + irqd_to_npcm_sgpio_data(d, &gpio, &bank, &bit, &offset); + status_addr = bank_reg(gpio, bank, EVENT_STS); + spin_lock_irqsave(&gpio->lock, flags); + iowrite8(BIT(bit), status_addr); + spin_unlock_irqrestore(&gpio->lock, flags); +} + +static void npcm_sgpio_irq_mask(struct irq_data *d) +{ + npcm_sgpio_irq_set_mask(d, true); +} + +static void npcm_sgpio_irq_unmask(struct irq_data *d) +{ + npcm_sgpio_irq_set_mask(d, false); +} + +static int npcm_sgpio_set_type(struct irq_data *d, unsigned int type) +{ + const struct npcm_sgpio_bank *bank; + irq_flow_handler_t handler; + struct npcm_sgpio *gpio; + unsigned long flags; + void __iomem *addr; + int offset; + u16 reg, val; + u8 bit; + + irqd_to_npcm_sgpio_data(d, &gpio, &bank, &bit, &offset); + + switch (type & IRQ_TYPE_SENSE_MASK) { + case IRQ_TYPE_EDGE_BOTH: + val = NPCM_IXOEVCFG_BOTH; + handler = handle_edge_irq; + break; + case IRQ_TYPE_EDGE_RISING: + val = NPCM_IXOEVCFG_RISING; + handler = handle_edge_irq; + break; + case IRQ_TYPE_EDGE_FALLING: + val = NPCM_IXOEVCFG_FALLING; + handler = handle_edge_irq; + break; + case IRQ_TYPE_LEVEL_HIGH: + val = NPCM_IXOEVCFG_RISING; + handler = handle_level_irq; + break; + case IRQ_TYPE_LEVEL_LOW: + val = NPCM_IXOEVCFG_FALLING; + handler = handle_level_irq; + break; + default: + return -EINVAL; + } + + gpio->int_type[offset] = val; + + spin_lock_irqsave(&gpio->lock, flags); + npcm_sgpio_setup_enable(gpio, false); + addr = bank_reg(gpio, bank, EVENT_CFG); + reg = ioread16(addr); + + reg |= (val << (bit * 2)); + + iowrite16(reg, addr); + npcm_sgpio_setup_enable(gpio, true); + spin_unlock_irqrestore(&gpio->lock, flags); + + irq_set_handler_locked(d, handler); + + return 0; +} + +static void npcm_sgpio_irq_handler(struct irq_desc *desc) +{ + struct gpio_chip *gc = irq_desc_get_handler_data(desc); + struct irq_chip *ic = irq_desc_get_chip(desc); + struct npcm_sgpio *gpio = gpiochip_get_data(gc); + unsigned int i, j, girq; + unsigned long reg; + + chained_irq_enter(ic, desc); + + for (i = 0; i < ARRAY_SIZE(npcm_sgpio_banks); i++) { + const struct npcm_sgpio_bank *bank = &npcm_sgpio_banks[i]; + + reg = ioread8(bank_reg(gpio, bank, EVENT_STS)); + for_each_set_bit(j, ®, 8) { + girq = irq_find_mapping(gc->irq.domain, i * 8 + gpio->nout_sgpio + j); + generic_handle_irq(girq); + } + } + + chained_irq_exit(ic, desc); +} + +static int npcm_sgpio_setup_irqs(struct npcm_sgpio *gpio, + struct platform_device *pdev) +{ + int rc, i; + struct gpio_irq_chip *irq; + + rc = platform_get_irq(pdev, 0); + if (rc < 0) + return rc; + + gpio->irq = rc; + + npcm_sgpio_setup_enable(gpio, false); + + /* Disable IRQ and clear Interrupt status registers for all SGPIO Pins. */ + for (i = 0; i < ARRAY_SIZE(npcm_sgpio_banks); i++) { + const struct npcm_sgpio_bank *bank = &npcm_sgpio_banks[i]; + + iowrite16(0x0000, bank_reg(gpio, bank, EVENT_CFG)); + iowrite8(0xff, bank_reg(gpio, bank, EVENT_STS)); + } + + gpio->intc.name = dev_name(&pdev->dev); + gpio->intc.irq_ack = npcm_sgpio_irq_ack; + gpio->intc.irq_mask = npcm_sgpio_irq_mask; + gpio->intc.irq_unmask = npcm_sgpio_irq_unmask; + gpio->intc.irq_set_type = npcm_sgpio_set_type; + + irq = &gpio->chip.irq; + irq->chip = &gpio->intc; + irq->init_valid_mask = npcm_sgpio_irq_init_valid_mask; + irq->handler = handle_bad_irq; + irq->default_type = IRQ_TYPE_NONE; + irq->parent_handler = npcm_sgpio_irq_handler; + irq->parent_handler_data = gpio; + irq->parents = &gpio->irq; + irq->num_parents = 1; + + return 0; +} + +static const int npcm750_SFT_CLK[] = { + 1024, 32, 8, 4, 3, 2, +}; + +static const u8 npcm750_CLK_SEL[] = { + 0x00, 0x05, 0x07, 0x0C, 0x0D, 0x0E, +}; + +static const int npcm845_SFT_CLK[] = { + 1024, 32, 16, 8, 4, +}; + +static const u8 npcm845_CLK_SEL[] = { + 0x00, 0x05, 0x06, 0x07, 0x0C, +}; + +static const struct npcm_clk_cfg npcm750_sgpio_pdata = { + .SFT_CLK = npcm750_SFT_CLK, + .CLK_SEL = npcm750_CLK_SEL, + .cfg_opt = 6, +}; + +static const struct npcm_clk_cfg npcm845_sgpio_pdata = { + .SFT_CLK = npcm845_SFT_CLK, + .CLK_SEL = npcm845_CLK_SEL, + .cfg_opt = 5, +}; + +static const struct of_device_id npcm_sgpio_of_table[] = { + { .compatible = "nuvoton,npcm750-sgpio", .data = &npcm750_sgpio_pdata, }, + { .compatible = "nuvoton,npcm845-sgpio", .data = &npcm845_sgpio_pdata, }, + {} +}; + +MODULE_DEVICE_TABLE(of, npcm_sgpio_of_table); + +static int npcm_sgpio_probe(struct platform_device *pdev) +{ + struct npcm_sgpio *gpio; + const struct npcm_clk_cfg *clk_cfg; + int rc; + u32 nin_gpios, nout_gpios, sgpio_freq; + + gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL); + if (!gpio) + return -ENOMEM; + + gpio->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(gpio->base)) + return PTR_ERR(gpio->base); + + clk_cfg = device_get_match_data(&pdev->dev); + if (!clk_cfg) + return -EINVAL; + + rc = device_property_read_u32(&pdev->dev, "nuvoton,input-ngpios", &nin_gpios); + if (rc < 0) { + dev_err(&pdev->dev, "Could not read ngpios property\n"); + return -EINVAL; + } + rc = device_property_read_u32(&pdev->dev, "nuvoton,output-ngpios", &nout_gpios); + if (rc < 0) { + dev_err(&pdev->dev, "Could not read ngpios property\n"); + return -EINVAL; + } + + gpio->nin_sgpio = nin_gpios; + gpio->nout_sgpio = nout_gpios; + if (gpio->nin_sgpio > MAX_NR_HW_SGPIO || gpio->nout_sgpio > MAX_NR_HW_SGPIO) { + dev_err(&pdev->dev, "Number of GPIOs exceeds the maximum of %d: input: %d output: %d\n", + MAX_NR_HW_SGPIO, nin_gpios, nout_gpios); + return -EINVAL; + } + + rc = device_property_read_u32(&pdev->dev, "bus-frequency", &sgpio_freq); + if (rc < 0) { + dev_err(&pdev->dev, "Could not read bus-frequency property\n"); + return -EINVAL; + } + + gpio->pclk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(gpio->pclk)) { + dev_err(&pdev->dev, "Could not get pclk\n"); + return PTR_ERR(gpio->pclk); + } + + rc = npcm_sgpio_setup_clk(gpio, clk_cfg, sgpio_freq); + if (rc < 0) { + dev_err(&pdev->dev, "Failed to setup clock\n"); + return -EINVAL; + } + spin_lock_init(&gpio->lock); + gpio->chip.parent = &pdev->dev; + gpio->chip.ngpio = gpio->nin_sgpio + gpio->nout_sgpio; + gpio->chip.direction_input = npcm_sgpio_dir_in; + gpio->chip.direction_output = npcm_sgpio_dir_out; + gpio->chip.get_direction = npcm_sgpio_get_direction; + gpio->chip.request = NULL; + gpio->chip.free = NULL; + gpio->chip.get = npcm_sgpio_get; + gpio->chip.set = npcm_sgpio_set; + gpio->chip.set_config = NULL; + gpio->chip.label = dev_name(&pdev->dev); + gpio->chip.base = -1; + + rc = npcm_sgpio_init_port(gpio); + if (rc < 0) + return rc; + + rc = npcm_sgpio_setup_irqs(gpio, pdev); + if (rc < 0) + return rc; + + rc = devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio); + if (rc < 0) + return rc; + + npcm_sgpio_setup_enable(gpio, true); + printk("NPCM: SGPIO module is ready\n"); + + return 0; +} + +static struct platform_driver npcm_sgpio_driver = { + .driver = { + .name = KBUILD_MODNAME, + .of_match_table = npcm_sgpio_of_table, + }, + .probe = npcm_sgpio_probe, +}; + +module_platform_driver(npcm_sgpio_driver); + +MODULE_AUTHOR("Jim Liu "); +MODULE_AUTHOR("Joseph Liu "); +MODULE_DESCRIPTION("Nuvoton NPCM Serial GPIO Driver"); +MODULE_LICENSE("GPL v2");