From patchwork Tue Jun 6 01:42:31 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Hawkins, Nick" X-Patchwork-Id: 13268145 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 9C689C7EE32 for ; Tue, 6 Jun 2023 01:47:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234118AbjFFBrU (ORCPT ); Mon, 5 Jun 2023 21:47:20 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34808 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234027AbjFFBrL (ORCPT ); Mon, 5 Jun 2023 21:47:11 -0400 Received: from mx0a-002e3701.pphosted.com (mx0a-002e3701.pphosted.com [148.163.147.86]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A043D1A5; Mon, 5 Jun 2023 18:46:54 -0700 (PDT) Received: from pps.filterd (m0148663.ppops.net [127.0.0.1]) by mx0a-002e3701.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 355KA0Hf029576; Tue, 6 Jun 2023 01:46:32 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=hpe.com; h=from : to : subject : date : message-id : in-reply-to : references; s=pps0720; bh=CIVk0iyfiCqEM3+pTjLBiagcz4I6zrxsQOsvByMoFnE=; b=BQgKfeyvuaPBbz9DBGCOizAok1c0GawMhEHC6M9lhJzkW2WpmyMXNmXbQg/VcJMgcxHF K+EBjhh5Irg3EnEh8hYHzpdsSDdMFxnxInM7J3jnBVJbEADmgB0xj0Ex3p1FjYr3yt8I WcQPYf1fAs9Lq4/upeTgSU0vPGtNQ+SK1jfuZ2wI/klKKNjLog6jPYz/XNTo2iN0hM7w nKRmzHItWmmhMtdPvRGTW+yZNDK5xABWVk5QjJ4cBMMpZJdtcF79yqqWbnY1n2KQGvOj cwvxcNE5aBKQjR8wj7AAd6Ode1de5tXUknI+ovYYyrMxIWPL1q/UKtH2z0QDmXeSvPkc PA== Received: from p1lg14881.it.hpe.com (p1lg14881.it.hpe.com [16.230.97.202]) by mx0a-002e3701.pphosted.com (PPS) with ESMTPS id 3r1pg3sqqx-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 06 Jun 2023 01:46:32 +0000 Received: from p1lg14885.dc01.its.hpecorp.net (unknown [10.119.18.236]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by p1lg14881.it.hpe.com (Postfix) with ESMTPS id E31F6804DD0; Tue, 6 Jun 2023 01:46:31 +0000 (UTC) Received: from hpe.com (unknown [16.231.227.36]) by p1lg14885.dc01.its.hpecorp.net (Postfix) with ESMTP id 13ECE80A543; Tue, 6 Jun 2023 01:46:31 +0000 (UTC) From: nick.hawkins@hpe.com To: verdun@hpe.com, nick.hawkins@hpe.com, linus.walleij@linaro.org, brgl@bgdev.pl, robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, jdelvare@suse.com, linux@roeck-us.net, andy.shevchenko@gmail.com, linux-gpio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-hwmon@vger.kernel.org Subject: [PATCH v3 2/5] gpio: gxp: Add HPE GXP GPIO Date: Mon, 5 Jun 2023 20:42:31 -0500 Message-Id: <20230606014234.29491-3-nick.hawkins@hpe.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20230606014234.29491-1-nick.hawkins@hpe.com> References: <20230606014234.29491-1-nick.hawkins@hpe.com> X-Proofpoint-ORIG-GUID: pHPAGnG9mFpo36bPTrSOAIyqBqs8-TMK X-Proofpoint-GUID: pHPAGnG9mFpo36bPTrSOAIyqBqs8-TMK X-HPE-SCL: -1 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.957,Hydra:6.0.573,FMLib:17.11.176.26 definitions=2023-06-05_35,2023-06-05_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 bulkscore=0 phishscore=0 mlxlogscore=999 priorityscore=1501 mlxscore=0 lowpriorityscore=0 impostorscore=0 suspectscore=0 spamscore=0 clxscore=1015 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2304280000 definitions=main-2306060014 Precedence: bulk List-ID: X-Mailing-List: linux-hwmon@vger.kernel.org From: Nick Hawkins The GXP SoC supports GPIO on multiple interfaces. The interfaces are CPLD and Host. The GPIOs is a combination of both physical and virtual I/O across the interfaces. The gpio-gxp driver specifically covers the CSM(physical), FN2(virtual), and VUHC(virtual) which are the host. The gpio-gxp-pl driver covers the CPLD which takes physical I/O from the board and shares it with GXP via a propriety interface that maps the I/O onto a specific register area of the GXP. The drivers both support interrupts but from different interrupt parents. Signed-off-by: Nick Hawkins --- v3: *Remove shared variables with gxp-fan-ctrl v2: *Separated code into two files to keep size down: gpio-gxp.c and gpio-gxp-pl.c *Fixed Kconfig indentation as well as add new entry for gpio-gxp-pl *Removed use of linux/of.h and linux/of_device.h *Added mod_devicetable.h and property.h *Fixed indentation of defines and uses consistent number of digits *Corrected defines with improper GPIO_ namespace. *For masks now use BIT() *Added comment for PLREG offsets *Move gpio_chip to be first in structure *Calculate offset for high and low byte GPIO reads instead of having H(High) and L(Low) letters added to the variables. *Removed repeditive use of "? 1 : 0" *Switched to handle_bad_irq() *Removed improper bailout on gpiochip_add_data *Used GENMASK to arm interrupts *Removed use of of_match_device *fixed sizeof in devm_kzalloc *Added COMPILE_TEST to Kconfig *Added dev_err_probe *Removed unecessary parent and compatible checks --- drivers/gpio/Kconfig | 18 ++ drivers/gpio/Makefile | 2 + drivers/gpio/gpio-gxp-pl.c | 519 ++++++++++++++++++++++++++++++ drivers/gpio/gpio-gxp.c | 637 +++++++++++++++++++++++++++++++++++++ 4 files changed, 1176 insertions(+) create mode 100644 drivers/gpio/gpio-gxp-pl.c create mode 100644 drivers/gpio/gpio-gxp.c diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index 13be729710f2..b0a24ef18392 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -1235,6 +1235,24 @@ config HTC_EGPIO several HTC phones. It provides basic support for input pins, output pins, and IRQs. +config GPIO_GXP + tristate "GXP GPIO support" + depends on ARCH_HPE_GXP || COMPILE_TEST + select GPIOLIB_IRQCHIP + help + Say Y here to support GXP GPIO controllers. It provides + support for the multiple GPIO interfaces available to be + available to the Host. + +config GPIO_GXP_PL + tristate "GXP GPIO PL support" + depends on ARCH_HPE_GXP || COMPILE_TEST + select GPIOLIB_IRQCHIP + help + Say Y here to support GXP GPIO PL controller. It provides + support for the GPIO PL interface available to be + available to the Host. + config GPIO_JANZ_TTL tristate "Janz VMOD-TTL Digital IO Module" depends on MFD_JANZ_CMODIO diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index c048ba003367..a401dd472c93 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -63,6 +63,8 @@ obj-$(CONFIG_GPIO_FTGPIO010) += gpio-ftgpio010.o obj-$(CONFIG_GPIO_GE_FPGA) += gpio-ge.o obj-$(CONFIG_GPIO_GPIO_MM) += gpio-gpio-mm.o obj-$(CONFIG_GPIO_GRGPIO) += gpio-grgpio.o +obj-$(CONFIG_GPIO_GXP) += gpio-gxp.o +obj-$(CONFIG_GPIO_GXP_PL) += gpio-gxp-pl.o obj-$(CONFIG_GPIO_GW_PLD) += gpio-gw-pld.o obj-$(CONFIG_GPIO_HISI) += gpio-hisi.o obj-$(CONFIG_GPIO_HLWD) += gpio-hlwd.o diff --git a/drivers/gpio/gpio-gxp-pl.c b/drivers/gpio/gpio-gxp-pl.c new file mode 100644 index 000000000000..eaa2ffe2edfa --- /dev/null +++ b/drivers/gpio/gpio-gxp-pl.c @@ -0,0 +1,519 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* Copyright (C) 2023 Hewlett-Packard Enterprise Development Company, L.P. */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* Specific offsets in CPLD registers for interrupts */ +#define PLREG_INT_GRP_STAT_MASK 0x08 +#define PLREG_INT_HI_PRI_EN 0x0C +#define PLREG_INT_GRP5_BASE 0x31 +#define PLREG_INT_GRP6_BASE 0x35 +#define PLREG_INT_GRP5_FLAG 0x30 +#define PLREG_INT_GRP6_FLAG 0x34 + +/* Specific bits to enable Group 4 and Group 5 interrupts */ +#define PLREG_GRP4_GRP5_MASK GENMASK(5, 4) + +/* Specific offsets in CPLD registers */ +#define PLREG_IOP_LED 0x04 +#define PLREG_IDENT_LED 0x05 +#define PLREG_HEALTH_LED 0x0D +#define PLREG_PSU_INST 0x19 +#define PLREG_PSU_AC 0x1B +#define PLREG_PSU_DC 0x1C +#define PLREG_FAN_INST 0x27 +#define PLREG_FAN_FAIL 0x29 + +#define GXP_GPIO_DIR_OUT 0x00 +#define GXP_GPIO_DIR_IN 0x01 + +enum pl_gpio_pn { + IOP_LED1 = 0, + IOP_LED2 = 1, + IOP_LED3 = 2, + IOP_LED4 = 3, + IOP_LED5 = 4, + IOP_LED6 = 5, + IOP_LED7 = 6, + IOP_LED8 = 7, + FAN1_INST = 8, + FAN2_INST = 9, + FAN3_INST = 10, + FAN4_INST = 11, + FAN5_INST = 12, + FAN6_INST = 13, + FAN7_INST = 14, + FAN8_INST = 15, + FAN1_FAIL = 16, + FAN2_FAIL = 17, + FAN3_FAIL = 18, + FAN4_FAIL = 19, + FAN5_FAIL = 20, + FAN6_FAIL = 21, + FAN7_FAIL = 22, + FAN8_FAIL = 23, + LED_IDENTIFY = 24, + LED_HEALTH_RED = 25, + LED_HEALTH_AMBER = 26, + PWR_BTN_INT = 27, + UID_PRESS_INT = 28, + SLP_INT = 29, + ACM_FORCE_OFF = 30, + ACM_REMOVED = 31, + ACM_REQ_N = 32, + PSU1_INST = 33, + PSU2_INST = 34, + PSU3_INST = 35, + PSU4_INST = 36, + PSU5_INST = 37, + PSU6_INST = 38, + PSU7_INST = 39, + PSU8_INST = 40, + PSU1_AC = 41, + PSU2_AC = 42, + PSU3_AC = 43, + PSU4_AC = 44, + PSU5_AC = 45, + PSU6_AC = 46, + PSU7_AC = 47, + PSU8_AC = 48, + PSU1_DC = 49, + PSU2_DC = 50, + PSU3_DC = 51, + PSU4_DC = 52, + PSU5_DC = 53, + PSU6_DC = 54, + PSU7_DC = 55, + PSU8_DC = 56, + RESET = 57, + NMI_OUT = 58, + VPBTN = 59, + PGOOD = 60, + PERST = 61, + POST_COMPLETE = 62, +}; + +/* Remember last PSU config */ +u8 psu_presence; + +struct gxp_gpio_drvdata { + struct regmap *base; + struct regmap *interrupt; + struct gpio_chip chip; + int irq; +}; + +static struct regmap *gxp_gpio_init_regmap(struct platform_device *pdev, + char *reg_name, u8 bits) +{ + struct regmap_config regmap_config = { + .reg_bits = 32, + .reg_stride = 4, + .val_bits = 32, + }; + void __iomem *base; + + if (bits == 8) { + regmap_config.reg_bits = 8; + regmap_config.reg_stride = 1; + regmap_config.val_bits = 8; + regmap_config.max_register = 0xff; + } + + base = devm_platform_ioremap_resource_byname(pdev, reg_name); + if (IS_ERR(base)) + return ERR_CAST(base); + + regmap_config.name = reg_name; + + return devm_regmap_init_mmio(&pdev->dev, base, ®map_config); +} + +static int gxp_gpio_pl_get(struct gpio_chip *chip, unsigned int offset) +{ + struct gxp_gpio_drvdata *drvdata = dev_get_drvdata(chip->parent); + unsigned int val; + int ret = 0; + + switch (offset) { + case IOP_LED1 ... IOP_LED8: + regmap_read(drvdata->base, PLREG_IOP_LED, &val); + ret = (val & BIT(offset)) ? 1 : 0; + break; + case FAN1_INST ...FAN8_INST: + regmap_read(drvdata->base, PLREG_FAN_INST, &val); + ret = (val & BIT((offset - FAN1_INST))) ? 1 : 0; + break; + case FAN1_FAIL ... FAN8_FAIL: + regmap_read(drvdata->base, PLREG_FAN_FAIL, &val); + ret = (val & BIT((offset - FAN1_FAIL))) ? 1 : 0; + break; + case PWR_BTN_INT ... SLP_INT: + regmap_read(drvdata->base, PLREG_INT_GRP5_FLAG, &val); + /* Active low */ + ret = (val & BIT((offset - PWR_BTN_INT) + 16)) ? 0 : 1; + break; + case PSU1_INST ... PSU8_INST: + regmap_read(drvdata->base, PLREG_PSU_INST, &val); + psu_presence = (u8)val; + ret = (psu_presence & BIT((offset - PSU1_INST))) ? 1 : 0; + break; + case PSU1_AC ... PSU8_AC: + regmap_read(drvdata->base, PLREG_PSU_AC, &val); + ret = (val & BIT((offset - PSU1_AC))) ? 1 : 0; + break; + case PSU1_DC ... PSU8_DC: + regmap_read(drvdata->base, PLREG_PSU_DC, &val); + ret = (val & BIT((offset - PSU1_DC))) ? 1 : 0; + break; + default: + break; + } + + return ret; +} + +static void gxp_gpio_pl_set(struct gpio_chip *chip, + unsigned int offset, int value) +{ + struct gxp_gpio_drvdata *drvdata = dev_get_drvdata(chip->parent); + + switch (offset) { + case IOP_LED1 ... IOP_LED8: + regmap_update_bits(drvdata->base, + PLREG_IOP_LED, + BIT(offset), + value == 0 ? 0 : BIT(offset)); + break; + case LED_IDENTIFY: + regmap_update_bits(drvdata->base, + PLREG_IDENT_LED, + BIT(7) | BIT(6), + value == 0 ? BIT(7) : BIT(7) | BIT(6)); + break; + case LED_HEALTH_RED: + regmap_update_bits(drvdata->base, + PLREG_HEALTH_LED, + BIT(7), + value == 0 ? 0 : BIT(7)); + break; + case LED_HEALTH_AMBER: + regmap_update_bits(drvdata->base, + PLREG_HEALTH_LED, + BIT(6), + value == 0 ? 0 : BIT(6)); + break; + default: + break; + } +} + +static int gxp_gpio_pl_get_direction(struct gpio_chip *chip, unsigned int offset) +{ + int ret = GXP_GPIO_DIR_IN; + + switch (offset) { + case IOP_LED1 ... IOP_LED8: + case LED_IDENTIFY ... LED_HEALTH_AMBER: + case ACM_FORCE_OFF: + case ACM_REQ_N: + ret = GXP_GPIO_DIR_OUT; + break; + default: + break; + } + + return ret; +} + +static int gxp_gpio_pl_direction_input(struct gpio_chip *chip, + unsigned int offset) +{ + int ret = -EOPNOTSUPP; + + switch (offset) { + case 8 ... 55: + ret = GXP_GPIO_DIR_OUT; + break; + case 59 ... 65: + ret = GXP_GPIO_DIR_OUT; + break; + default: + break; + } + + return ret; +} + +static int gxp_gpio_pl_direction_output(struct gpio_chip *chip, + unsigned int offset, int value) +{ + int ret = -EOPNOTSUPP; + + switch (offset) { + case IOP_LED1 ... IOP_LED8: + case LED_IDENTIFY ... LED_HEALTH_AMBER: + case ACM_FORCE_OFF: + case ACM_REQ_N: + gxp_gpio_pl_set(chip, offset, value); + ret = GXP_GPIO_DIR_OUT; + break; + default: + break; + } + + return ret; +} + +static void gxp_gpio_pl_irq_ack(struct irq_data *d) +{ + struct gpio_chip *chip = irq_data_get_irq_chip_data(d); + struct gxp_gpio_drvdata *drvdata = dev_get_drvdata(chip->parent); + unsigned int val; + + /* Read latched interrupt for group 5 */ + regmap_read(drvdata->interrupt, PLREG_INT_GRP5_FLAG, &val); + /* Clear latched interrupt */ + regmap_update_bits(drvdata->interrupt, PLREG_INT_GRP5_FLAG, + 0xFF, 0xFF); + + /* Read latched interrupt for group 6 */ + regmap_read(drvdata->interrupt, PLREG_INT_GRP6_FLAG, &val); + /* Clear latched interrupt */ + regmap_update_bits(drvdata->interrupt, PLREG_INT_GRP6_FLAG, + 0xFF, 0xFF); +} + +static void gxp_gpio_pl_irq_set_mask(struct irq_data *d, bool set) +{ + struct gpio_chip *chip = irq_data_get_irq_chip_data(d); + struct gxp_gpio_drvdata *drvdata = dev_get_drvdata(chip->parent); + + regmap_update_bits(drvdata->interrupt, PLREG_INT_GRP5_BASE, + BIT(0) | BIT(2), set ? 0 : BIT(0) | BIT(2)); + + regmap_update_bits(drvdata->interrupt, PLREG_INT_GRP6_BASE, + BIT(2), set ? 0 : BIT(2)); +} + +static void gxp_gpio_pl_irq_mask(struct irq_data *d) +{ + gxp_gpio_pl_irq_set_mask(d, false); +} + +static void gxp_gpio_pl_irq_unmask(struct irq_data *d) +{ + gxp_gpio_pl_irq_set_mask(d, true); +} + +static int gxp_gpio_irq_init_hw(struct gpio_chip *chip) +{ + struct gxp_gpio_drvdata *drvdata = dev_get_drvdata(chip->parent); + + regmap_update_bits(drvdata->interrupt, PLREG_INT_GRP5_BASE, + BIT(0) | BIT(2), 0); + + regmap_update_bits(drvdata->interrupt, PLREG_INT_GRP6_BASE, + BIT(2), 0); + + return 0; +} + +static int gxp_gpio_pl_set_type(struct irq_data *d, unsigned int type) +{ + if (type & IRQ_TYPE_LEVEL_MASK) + irq_set_handler_locked(d, handle_level_irq); + else + irq_set_handler_locked(d, handle_edge_irq); + + return 0; +} + +static irqreturn_t gxp_gpio_pl_irq_handle(int irq, void *_drvdata) +{ + struct gxp_gpio_drvdata *drvdata = (struct gxp_gpio_drvdata *)_drvdata; + unsigned int val, girq, i; + + /* Check group 5 interrupts */ + + regmap_read(drvdata->base, PLREG_INT_GRP5_FLAG, &val); + + if (val) { + for_each_set_bit(i, (unsigned long *)&val, 3) { + girq = irq_find_mapping(drvdata->chip.irq.domain, + i + PWR_BTN_INT); + generic_handle_irq(girq); + } + + /* Clear latched interrupt */ + regmap_update_bits(drvdata->interrupt, PLREG_INT_GRP5_FLAG, + 0xFF, 0xFF); + regmap_update_bits(drvdata->interrupt, PLREG_INT_GRP5_BASE, + BIT(0) | BIT(2), 0); + } + + /* Check group 6 interrupts */ + + regmap_read(drvdata->base, PLREG_INT_GRP6_FLAG, &val); + + if (val & BIT(2)) { + u8 old_psu = psu_presence; + + regmap_read(drvdata->base, PLREG_PSU_INST, &val); + psu_presence = (u8)val; + + if (old_psu != psu_presence) { + /* Identify all bits which differs */ + u8 current_val = psu_presence; + u8 old_val = old_psu; + + for (i = 0 ; i < 8 ; i++) { + if ((current_val & 0x1) != (old_val & 0x1)) { + /* PSU state has changed */ + girq = irq_find_mapping(drvdata->chip.irq.domain, + i + PSU1_INST); + if (girq) + generic_handle_irq(girq); + } + current_val = current_val >> 1; + old_val = old_val >> 1; + } + } + } + + /* Clear latched interrupt */ + regmap_update_bits(drvdata->interrupt, PLREG_INT_GRP6_FLAG, + 0xFF, 0xFF); + regmap_update_bits(drvdata->interrupt, PLREG_INT_GRP6_BASE, + BIT(2), 0); + + return IRQ_HANDLED; +} + +static struct gpio_chip plreg_chip = { + .label = "gxp_gpio_plreg", + .owner = THIS_MODULE, + .get = gxp_gpio_pl_get, + .set = gxp_gpio_pl_set, + .get_direction = gxp_gpio_pl_get_direction, + .direction_input = gxp_gpio_pl_direction_input, + .direction_output = gxp_gpio_pl_direction_output, + .base = -1, +}; + +static struct irq_chip gxp_plreg_irqchip = { + .name = "gxp_plreg", + .irq_ack = gxp_gpio_pl_irq_ack, + .irq_mask = gxp_gpio_pl_irq_mask, + .irq_unmask = gxp_gpio_pl_irq_unmask, + .irq_set_type = gxp_gpio_pl_set_type, +}; + +static int gxp_gpio_pl_init(struct platform_device *pdev) +{ + struct gxp_gpio_drvdata *drvdata = dev_get_drvdata(&pdev->dev); + struct gpio_irq_chip *girq; + int ret; + unsigned int val; + + drvdata->base = gxp_gpio_init_regmap(pdev, "base", 8); + if (IS_ERR(drvdata->base)) + return dev_err_probe(&pdev->dev, PTR_ERR(drvdata->base), + "failed to map base\n"); + + drvdata->interrupt = gxp_gpio_init_regmap(pdev, "interrupt", 8); + if (IS_ERR(drvdata->interrupt)) + return dev_err_probe(&pdev->dev, PTR_ERR(drvdata->interrupt), + "failed to map interrupt base\n"); + + regmap_read(drvdata->base, PLREG_PSU_INST, &val); + psu_presence = (u8)val; + + drvdata->chip = plreg_chip; + drvdata->chip.ngpio = 57; + drvdata->chip.parent = &pdev->dev; + + girq = &drvdata->chip.irq; + girq->chip = &gxp_plreg_irqchip; + girq->parent_handler = NULL; + girq->num_parents = 0; + girq->parents = NULL; + girq->default_type = IRQ_TYPE_NONE; + girq->handler = handle_bad_irq; + + girq->init_hw = gxp_gpio_irq_init_hw; + + ret = devm_gpiochip_add_data(&pdev->dev, &drvdata->chip, drvdata); + if (ret < 0) + dev_err_probe(&pdev->dev, ret, "Could not register gpiochip for plreg\n"); + + regmap_update_bits(drvdata->base, + PLREG_INT_HI_PRI_EN, + PLREG_GRP4_GRP5_MASK, + PLREG_GRP4_GRP5_MASK); + regmap_update_bits(drvdata->base, + PLREG_INT_GRP_STAT_MASK, + PLREG_GRP4_GRP5_MASK, + 0x00); + regmap_read(drvdata->base, PLREG_INT_HI_PRI_EN, &val); + regmap_read(drvdata->base, PLREG_INT_GRP_STAT_MASK, &val); + + ret = platform_get_irq(pdev, 0); + if (ret < 0) + return dev_err_probe(&pdev->dev, ret, "Get irq from platform fail\n"); + + drvdata->irq = ret; + + ret = devm_request_irq(&pdev->dev, drvdata->irq, gxp_gpio_pl_irq_handle, + IRQF_SHARED, "gxp-pl", drvdata); + if (ret < 0) + return ret; + + return 0; +} + +static const struct of_device_id gxp_gpio_of_match[] = { + { .compatible = "hpe,gxp-gpio-pl" }, + {} +}; +MODULE_DEVICE_TABLE(of, gxp_gpio_of_match); + +static int gxp_gpio_probe(struct platform_device *pdev) +{ + int ret; + struct gxp_gpio_drvdata *drvdata; + + /* Initialize global vars */ + psu_presence = 0; + + drvdata = devm_kzalloc(&pdev->dev, sizeof(*drvdata), GFP_KERNEL); + if (!drvdata) + return -ENOMEM; + + platform_set_drvdata(pdev, drvdata); + + ret = gxp_gpio_pl_init(pdev); + + return ret; +} + +static struct platform_driver gxp_gpio_driver = { + .driver = { + .name = "gxp-gpio-pl", + .of_match_table = gxp_gpio_of_match, + }, + .probe = gxp_gpio_probe, +}; +module_platform_driver(gxp_gpio_driver); + +MODULE_AUTHOR("Nick Hawkins "); +MODULE_DESCRIPTION("GPIO PL interface for GXP"); +MODULE_LICENSE("GPL"); diff --git a/drivers/gpio/gpio-gxp.c b/drivers/gpio/gpio-gxp.c new file mode 100644 index 000000000000..ed6d8577e6b7 --- /dev/null +++ b/drivers/gpio/gpio-gxp.c @@ -0,0 +1,637 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* Copyright (C) 2023 Hewlett-Packard Enterprise Development Company, L.P. */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define GPIDAT 0x040 +#define GPODAT 0x0b0 +#define GPODAT2 0x0f8 +#define GPOOWN 0x110 +#define GPOOWN2 0x118 +#define ASR_OFS 0x05c + +#define GXP_GPIO_DIR_OUT 0 +#define GXP_GPIO_DIR_IN 1 + +#define PGOOD_MASK BIT(0) + +struct gxp_gpio_drvdata { + struct gpio_chip chip; + struct regmap *csm_map; + void __iomem *fn2_vbtn; + struct regmap *fn2_stat; + struct regmap *vuhc0_map; + int irq; +}; + +/* + * Note: Instead of definining all PINs here are the select few that + * are specifically defined in DTS and offsets are used here. + */ +enum gxp_gpio_pn { + RESET = 192, + VPBTN = 210, /* aka POWER_OK */ + PGOOD = 211, /* aka PS_PWROK */ + PERST = 212, /* aka PCIERST */ + POST_COMPLETE = 213, +}; + +static int gxp_gpio_csm_get(struct gpio_chip *chip, unsigned int offset) +{ + struct gxp_gpio_drvdata *drvdata = dev_get_drvdata(chip->parent); + int ret = 0; + + switch (offset) { + case 0 ... 31: + regmap_read(drvdata->csm_map, GPIDAT, &ret); + ret = (ret & BIT(offset)); + break; + case 32 ... 63: + regmap_read(drvdata->csm_map, GPIDAT + 0x20, &ret); + ret = (ret & BIT(offset - 32)); + break; + case 64 ... 95: + regmap_read(drvdata->csm_map, GPODAT, &ret); + ret = (ret & BIT(offset - 64)); + break; + case 96 ... 127: + regmap_read(drvdata->csm_map, GPODAT + 0x04, &ret); + ret = (ret & BIT(offset - 96)); + break; + case 128 ... 159: + regmap_read(drvdata->csm_map, GPODAT2, &ret); + ret = (ret & BIT(offset - 128)); + break; + case 160 ... 191: + regmap_read(drvdata->csm_map, GPODAT2 + 0x04, &ret); + ret = (ret & BIT(offset - 160)); + break; + case RESET: + /* SW_RESET */ + regmap_read(drvdata->csm_map, ASR_OFS, &ret); + ret = (ret & BIT(15)); + break; + default: + break; + } + + /* Return either 1 or 0 */ + return (ret ? 1 : 0); +} + +static void gxp_gpio_csm_set(struct gpio_chip *chip, unsigned int offset, + int value) +{ + struct gxp_gpio_drvdata *drvdata = dev_get_drvdata(chip->parent); + u32 tmp; + + switch (offset) { + case 64 ... 95: + /* Keep ownership setting */ + regmap_read(drvdata->csm_map, GPOOWN, &tmp); + tmp = (tmp & BIT(offset - 64)) ? 1 : 0; + + regmap_update_bits(drvdata->csm_map, GPOOWN, + BIT(offset - 64), BIT(offset - 64)); + regmap_update_bits(drvdata->csm_map, GPODAT, + BIT(offset - 64), value ? BIT(offset - 64) : 0); + + /* Restore ownership setting */ + regmap_update_bits(drvdata->csm_map, GPOOWN, + BIT(offset - 64), tmp ? BIT(offset - 64) : 0); + break; + case 96 ... 127: + /* Keep ownership setting */ + regmap_read(drvdata->csm_map, GPOOWN + 0x04, &tmp); + tmp = (tmp & BIT(offset - 96)) ? 1 : 0; + + regmap_update_bits(drvdata->csm_map, GPOOWN + 0x04, + BIT(offset - 96), BIT(offset - 96)); + regmap_update_bits(drvdata->csm_map, GPODAT + 0x04, + BIT(offset - 96), value ? BIT(offset - 96) : 0); + + /* Restore ownership setting */ + regmap_update_bits(drvdata->csm_map, GPOOWN + 0x04, + BIT(offset - 96), tmp ? BIT(offset - 96) : 0); + break; + case 128 ... 159: + /* Keep ownership setting */ + regmap_read(drvdata->csm_map, GPOOWN2, &tmp); + tmp = (tmp & BIT(offset - 128)) ? 1 : 0; + + regmap_update_bits(drvdata->csm_map, GPOOWN2, + BIT(offset - 128), BIT(offset - 128)); + regmap_update_bits(drvdata->csm_map, GPODAT2, + BIT(offset - 128), value ? BIT(offset - 128) : 0); + + /* Restore ownership setting */ + regmap_update_bits(drvdata->csm_map, GPOOWN2, + BIT(offset - 128), tmp ? BIT(offset - 128) : 0); + break; + case 160 ... 191: + /* Keep ownership setting */ + regmap_read(drvdata->csm_map, GPOOWN2 + 0x04, &tmp); + tmp = (tmp & BIT(offset - 160)) ? 1 : 0; + + regmap_update_bits(drvdata->csm_map, GPOOWN2 + 0x04, + BIT(offset - 160), BIT(offset - 160)); + regmap_update_bits(drvdata->csm_map, GPODAT2 + 0x04, + BIT(offset - 160), value ? BIT(offset - 160) : 0); + + /* Restore ownership setting */ + regmap_update_bits(drvdata->csm_map, GPOOWN2 + 0x04, + BIT(offset - 160), tmp ? BIT(offset - 160) : 0); + break; + case 192: + if (value) { + regmap_update_bits(drvdata->csm_map, ASR_OFS, + BIT(0), BIT(0)); + regmap_update_bits(drvdata->csm_map, ASR_OFS, + BIT(15), BIT(15)); + } else { + regmap_update_bits(drvdata->csm_map, ASR_OFS, + BIT(15), 0); + } + break; + default: + break; + } +} + +static int gxp_gpio_csm_get_direction(struct gpio_chip *chip, + unsigned int offset) +{ + int ret = 0; + + switch (offset) { + case 0 ... 63: + ret = GXP_GPIO_DIR_IN; + break; + case 64 ... 191: + ret = GXP_GPIO_DIR_OUT; + break; + case 192 ... 193: + ret = GXP_GPIO_DIR_OUT; + break; + case 194: + ret = GXP_GPIO_DIR_IN; + break; + default: + break; + } + + return ret; +} + +static int gxp_gpio_csm_direction_input(struct gpio_chip *chip, + unsigned int offset) +{ + int ret = -EOPNOTSUPP; + + switch (offset) { + case 0 ... 63: + ret = 0; + break; + case 194: + ret = 0; + break; + default: + break; + } + + return ret; +} + +static int gxp_gpio_csm_direction_output(struct gpio_chip *chip, + unsigned int offset, int value) +{ + int ret = -EOPNOTSUPP; + + switch (offset) { + case 64 ... 191: + case 192 ... 193: + gxp_gpio_csm_set(chip, offset, value); + ret = 0; + break; + default: + break; + } + + return ret; +} + +static int gxp_gpio_vuhc_get(struct gpio_chip *chip, unsigned int offset) +{ + struct gxp_gpio_drvdata *drvdata = dev_get_drvdata(chip->parent); + unsigned int val; + int ret = 0; + + if (offset < 8) { + regmap_read(drvdata->vuhc0_map, 0x64 + 4 * offset, &val); + ret = (val & BIT(13)) ? 1 : 0; + } + + return ret; +} + +static void gxp_gpio_vuhc_set(struct gpio_chip *chip, unsigned int offset, + int value) +{ + switch (offset) { + default: + break; + } +} + +static int gxp_gpio_vuhc_get_direction(struct gpio_chip *chip, + unsigned int offset) +{ + int ret = 0; + + switch (offset) { + case 0: + case 1: + case 2: + ret = GXP_GPIO_DIR_IN; + break; + default: + break; + } + + return ret; +} + +static int gxp_gpio_vuhc_direction_input(struct gpio_chip *chip, + unsigned int offset) +{ + int ret = -EOPNOTSUPP; + + switch (offset) { + case 0: + case 1: + case 2: + ret = 0; + break; + default: + break; + } + + return ret; +} + +static int gxp_gpio_vuhc_direction_output(struct gpio_chip *chip, + unsigned int offset, int value) +{ + int ret = -EOPNOTSUPP; + + switch (offset) { + default: + break; + } + + return ret; +} + +static int gxp_gpio_fn2_get(struct gpio_chip *chip, unsigned int offset) +{ + struct gxp_gpio_drvdata *drvdata = dev_get_drvdata(chip->parent); + unsigned int val; + int ret = 0; + + switch (offset) { + case PGOOD: + regmap_read(drvdata->fn2_stat, 0, &val); + ret = (val & BIT(24)); + + break; + case PERST: + regmap_read(drvdata->fn2_stat, 0, &val); + ret = (val & BIT(25)); + + break; + default: + break; + } + + /* Return either 1 or 0 */ + return (ret ? 1 : 0); +} + +static void gxp_gpio_fn2_set(struct gpio_chip *chip, unsigned int offset, + int value) +{ + struct gxp_gpio_drvdata *drvdata = dev_get_drvdata(chip->parent); + + switch (offset) { + case VPBTN: + writeb(1, drvdata->fn2_vbtn); + break; + default: + break; + } +} + +static int gxp_gpio_fn2_get_direction(struct gpio_chip *chip, + unsigned int offset) +{ + int ret = GXP_GPIO_DIR_IN; + + switch (offset) { + case VPBTN: + ret = GXP_GPIO_DIR_OUT; + break; + default: + break; + } + + return ret; +} + +static int gxp_gpio_fn2_direction_input(struct gpio_chip *chip, + unsigned int offset) +{ + int ret = -EOPNOTSUPP; + + switch (offset) { + case PGOOD: + case PERST: + case POST_COMPLETE: + ret = 0; + break; + default: + break; + } + + return ret; +} + +static int gxp_gpio_get(struct gpio_chip *chip, unsigned int offset) +{ + int ret = 0; + + if (offset < 200) + ret = gxp_gpio_csm_get(chip, offset); + else if (offset >= 250 && offset < 300) + ret = gxp_gpio_vuhc_get(chip, offset - 250); + else if (offset >= 300) + ret = gxp_gpio_fn2_get(chip, offset); + + return ret; +} + +static void gxp_gpio_set(struct gpio_chip *chip, + unsigned int offset, int value) +{ + if (offset < 200) + gxp_gpio_csm_set(chip, offset, value); + else if (offset >= 250 && offset < 300) + gxp_gpio_vuhc_set(chip, offset - 250, value); + else if (offset >= 300) + gxp_gpio_fn2_set(chip, offset, value); +} + +static int gxp_gpio_get_direction(struct gpio_chip *chip, + unsigned int offset) +{ + int ret = 0; + + if (offset < 200) + ret = gxp_gpio_csm_get_direction(chip, offset); + else if (offset >= 250 && offset < 300) + ret = gxp_gpio_vuhc_get_direction(chip, offset - 250); + else if (offset >= 300) + ret = gxp_gpio_fn2_get_direction(chip, offset); + + return ret; +} + +static int gxp_gpio_direction_input(struct gpio_chip *chip, + unsigned int offset) +{ + int ret = 0; + + if (offset < 200) + ret = gxp_gpio_csm_direction_input(chip, offset); + else if (offset >= 250 && offset < 300) + ret = gxp_gpio_vuhc_direction_input(chip, offset - 250); + else if (offset >= 300) + ret = gxp_gpio_fn2_direction_input(chip, offset); + + return ret; +} + +static int gxp_gpio_direction_output(struct gpio_chip *chip, + unsigned int offset, int value) +{ + int ret = 0; + + if (offset < 200) + ret = gxp_gpio_csm_direction_output(chip, offset, value); + else if (offset >= 250 && offset < 300) + ret = gxp_gpio_vuhc_direction_output(chip, offset - 250, value); + return ret; +} + +static struct regmap *gxp_gpio_init_regmap(struct platform_device *pdev, + char *reg_name, u8 bits) +{ + struct regmap_config regmap_config = { + .reg_bits = 32, + .reg_stride = 4, + .val_bits = 32, + }; + void __iomem *base; + + if (bits == 8) { + regmap_config.reg_bits = 8; + regmap_config.reg_stride = 1; + regmap_config.val_bits = 8; + regmap_config.max_register = 0xff; + } + + base = devm_platform_ioremap_resource_byname(pdev, reg_name); + if (IS_ERR(base)) + return ERR_CAST(base); + + regmap_config.name = reg_name; + + return devm_regmap_init_mmio(&pdev->dev, base, ®map_config); +} + +static void gxp_gpio_fn2_irq_ack(struct irq_data *d) +{ + struct gpio_chip *chip = irq_data_get_irq_chip_data(d); + struct gxp_gpio_drvdata *drvdata = dev_get_drvdata(chip->parent); + unsigned int val; + + /* Read latched interrupt */ + regmap_read(drvdata->fn2_stat, 0, &val); + /* Clear latched interrupt */ + regmap_update_bits(drvdata->fn2_stat, 0, + 0xFFFF, 0xFFFF); +} + +#define FN2_SEVMASK BIT(2) +static void gxp_gpio_fn2_irq_set_mask(struct irq_data *d, bool set) +{ + struct gpio_chip *chip = irq_data_get_irq_chip_data(d); + struct gxp_gpio_drvdata *drvdata = dev_get_drvdata(chip->parent); + + regmap_update_bits(drvdata->fn2_stat, FN2_SEVMASK, + BIT(0), set ? BIT(0) : 0); +} + +static void gxp_gpio_fn2_irq_mask(struct irq_data *d) +{ + gxp_gpio_fn2_irq_set_mask(d, false); +} + +static void gxp_gpio_fn2_irq_unmask(struct irq_data *d) +{ + gxp_gpio_fn2_irq_set_mask(d, true); +} + +static int gxp_gpio_fn2_set_type(struct irq_data *d, unsigned int type) +{ + if (type & IRQ_TYPE_LEVEL_MASK) + irq_set_handler_locked(d, handle_level_irq); + else + irq_set_handler_locked(d, handle_edge_irq); + + return 0; +} + +static irqreturn_t gxp_gpio_fn2_irq_handle(int irq, void *_drvdata) +{ + struct gxp_gpio_drvdata *drvdata = (struct gxp_gpio_drvdata *)_drvdata; + unsigned int val, girq; + + regmap_read(drvdata->fn2_stat, 0, &val); + + if (val & PGOOD_MASK) { + girq = irq_find_mapping(drvdata->chip.irq.domain, PGOOD); + generic_handle_irq(girq); + } + + return IRQ_HANDLED; +} + +static struct irq_chip gxp_gpio_irqchip = { + .name = "gxp_fn2", + .irq_ack = gxp_gpio_fn2_irq_ack, + .irq_mask = gxp_gpio_fn2_irq_mask, + .irq_unmask = gxp_gpio_fn2_irq_unmask, + .irq_set_type = gxp_gpio_fn2_set_type, +}; + +static struct gpio_chip common_chip = { + .label = "gxp_gpio", + .owner = THIS_MODULE, + .get = gxp_gpio_get, + .set = gxp_gpio_set, + .get_direction = gxp_gpio_get_direction, + .direction_input = gxp_gpio_direction_input, + .direction_output = gxp_gpio_direction_output, + .base = 0, +}; + +static int gxp_gpio_init(struct platform_device *pdev) +{ + struct gxp_gpio_drvdata *drvdata = dev_get_drvdata(&pdev->dev); + struct gpio_irq_chip *girq; + int ret; + + drvdata->csm_map = gxp_gpio_init_regmap(pdev, "csm", 32); + if (IS_ERR(drvdata->csm_map)) + return dev_err_probe(&pdev->dev, PTR_ERR(drvdata->csm_map), + "failed to map csm_handle\n"); + + drvdata->fn2_vbtn = devm_platform_ioremap_resource_byname(pdev, "fn2-vbtn"); + if (IS_ERR(drvdata->fn2_vbtn)) + return dev_err_probe(&pdev->dev, PTR_ERR(drvdata->fn2_vbtn), + "failed to map fn2_vbtn\n"); + + drvdata->fn2_stat = gxp_gpio_init_regmap(pdev, "fn2-stat", 32); + if (IS_ERR(drvdata->fn2_stat)) + return dev_err_probe(&pdev->dev, PTR_ERR(drvdata->fn2_stat), + "failed to map fn2_stat\n"); + + drvdata->vuhc0_map = gxp_gpio_init_regmap(pdev, "vuhc", 32); + if (IS_ERR(drvdata->vuhc0_map)) + return dev_err_probe(&pdev->dev, PTR_ERR(drvdata->vuhc0_map), + "failed to map vuhc0_map\n"); + + girq = &drvdata->chip.irq; + girq->chip = &gxp_gpio_irqchip; + girq->parent_handler = NULL; + girq->num_parents = 0; + girq->parents = NULL; + girq->default_type = IRQ_TYPE_NONE; + girq->handler = handle_bad_irq; + + ret = platform_get_irq(pdev, 0); + if (ret < 0) + return dev_err_probe(&pdev->dev, ret, + "Get irq from platform fail\n"); + + drvdata->irq = ret; + + ret = devm_request_irq(&pdev->dev, drvdata->irq, gxp_gpio_fn2_irq_handle, + IRQF_SHARED, "gxp-fn2", drvdata); + if (ret < 0) + return ret; + + drvdata->chip = common_chip; + drvdata->chip.ngpio = 220; + + drvdata->chip.parent = &pdev->dev; + ret = devm_gpiochip_add_data(&pdev->dev, &drvdata->chip, NULL); + if (ret < 0) + return dev_err_probe(&pdev->dev, ret, + "Could not register gpiochip for fn2\n"); + + return 0; +} + +static const struct of_device_id gxp_gpio_of_match[] = { + { .compatible = "hpe,gxp-gpio" }, + {} +}; +MODULE_DEVICE_TABLE(of, gxp_gpio_of_match); + +static int gxp_gpio_probe(struct platform_device *pdev) +{ + int ret; + struct gxp_gpio_drvdata *drvdata; + + drvdata = devm_kzalloc(&pdev->dev, sizeof(*drvdata), GFP_KERNEL); + if (!drvdata) + return -ENOMEM; + + platform_set_drvdata(pdev, drvdata); + + ret = gxp_gpio_init(pdev); + + return ret; +} + +static struct platform_driver gxp_gpio_driver = { + .driver = { + .name = "gxp-gpio", + .of_match_table = gxp_gpio_of_match, + }, + .probe = gxp_gpio_probe, +}; +module_platform_driver(gxp_gpio_driver); + +MODULE_AUTHOR("Nick Hawkins "); +MODULE_DESCRIPTION("GPIO interface for GXP"); +MODULE_LICENSE("GPL");