From: Brad Larson <brad@pensando.io>
To: linux-arm-kernel@lists.infradead.org
Cc: arnd@arndb.de, linus.walleij@linaro.org,
bgolaszewski@baylibre.com, broonie@kernel.org,
fancer.lancer@gmail.com, adrian.hunter@intel.com,
ulf.hansson@linaro.org, olof@lixom.net, brad@pensando.io,
linux-gpio@vger.kernel.org, linux-spi@vger.kernel.org,
linux-mmc@vger.kernel.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: [PATCH v2 01/13] gpio: Add Elba SoC gpio driver for spi cs control
Date: Sun, 28 Mar 2021 18:59:26 -0700 [thread overview]
Message-ID: <20210329015938.20316-2-brad@pensando.io> (raw)
In-Reply-To: <20210329015938.20316-1-brad@pensando.io>
This GPIO driver is for the Pensando Elba SoC which
provides control of four chip selects on two SPI busses.
Signed-off-by: Brad Larson <brad@pensando.io>
---
drivers/gpio/Kconfig | 6 ++
drivers/gpio/Makefile | 1 +
drivers/gpio/gpio-elba-spics.c | 114 +++++++++++++++++++++++++++++++++
3 files changed, 121 insertions(+)
create mode 100644 drivers/gpio/gpio-elba-spics.c
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index e3607ec4c2e8..4720459b24f5 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -241,6 +241,12 @@ config GPIO_EIC_SPRD
help
Say yes here to support Spreadtrum EIC device.
+config GPIO_ELBA_SPICS
+ bool "Pensando Elba SPI chip-select"
+ depends on (ARCH_PENSANDO_ELBA_SOC || COMPILE_TEST)
+ help
+ Say yes here to support the Penasndo Elba SoC SPI chip-select driver
+
config GPIO_EM
tristate "Emma Mobile GPIO"
depends on (ARCH_EMEV2 || COMPILE_TEST) && OF_GPIO
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index c58a90a3c3b1..c5c7acad371b 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -54,6 +54,7 @@ obj-$(CONFIG_GPIO_DAVINCI) += gpio-davinci.o
obj-$(CONFIG_GPIO_DLN2) += gpio-dln2.o
obj-$(CONFIG_GPIO_DWAPB) += gpio-dwapb.o
obj-$(CONFIG_GPIO_EIC_SPRD) += gpio-eic-sprd.o
+obj-$(CONFIG_GPIO_ELBA_SPICS) += gpio-elba-spics.o
obj-$(CONFIG_GPIO_EM) += gpio-em.o
obj-$(CONFIG_GPIO_EP93XX) += gpio-ep93xx.o
obj-$(CONFIG_GPIO_EXAR) += gpio-exar.o
diff --git a/drivers/gpio/gpio-elba-spics.c b/drivers/gpio/gpio-elba-spics.c
new file mode 100644
index 000000000000..351bbaeea033
--- /dev/null
+++ b/drivers/gpio/gpio-elba-spics.c
@@ -0,0 +1,114 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Pensando Elba SoC SPI chip select driver
+ *
+ * Copyright (c) 2020-2021, Pensando Systems Inc.
+ */
+
+#include <linux/err.h>
+#include <linux/gpio.h>
+#include <linux/module.h>
+#include <linux/io.h>
+#include <linux/init.h>
+//#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/spinlock.h>
+#include <linux/types.h>
+
+/*
+ * pin: 3 2 | 1 0
+ * bit: 7------6------5------4----|---3------2------1------0
+ * cs1 cs1_ovr cs0 cs0_ovr | cs1 cs1_ovr cs0 cs0_ovr
+ * ssi1 | ssi0
+ */
+#define SPICS_PIN_SHIFT(pin) (2 * (pin))
+#define SPICS_MASK(pin) (0x3 << SPICS_PIN_SHIFT(pin))
+#define SPICS_SET(pin, val) ((((val) << 1) | 0x1) << SPICS_PIN_SHIFT(pin))
+
+struct elba_spics_priv {
+ void __iomem *base;
+ spinlock_t lock;
+ struct gpio_chip chip;
+};
+
+static int elba_spics_get_value(struct gpio_chip *chip, unsigned int pin)
+{
+ return -ENOTSUPP;
+}
+
+static void elba_spics_set_value(struct gpio_chip *chip,
+ unsigned int pin, int value)
+{
+ struct elba_spics_priv *p = gpiochip_get_data(chip);
+ unsigned long flags;
+ u32 tmp;
+
+ /* select chip select from register */
+ spin_lock_irqsave(&p->lock, flags);
+ tmp = readl_relaxed(p->base);
+ tmp = (tmp & ~SPICS_MASK(pin)) | SPICS_SET(pin, value);
+ writel_relaxed(tmp, p->base);
+ spin_unlock_irqrestore(&p->lock, flags);
+}
+
+static int elba_spics_direction_input(struct gpio_chip *chip, unsigned int pin)
+{
+ return -ENOTSUPP;
+}
+
+static int elba_spics_direction_output(struct gpio_chip *chip,
+ unsigned int pin, int value)
+{
+ elba_spics_set_value(chip, pin, value);
+ return 0;
+}
+
+static int elba_spics_probe(struct platform_device *pdev)
+{
+ struct elba_spics_priv *p;
+ struct resource *res;
+ int ret = 0;
+
+ p = devm_kzalloc(&pdev->dev, sizeof(*p), GFP_KERNEL);
+ if (!p)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ p->base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(p->base))
+ return PTR_ERR(p->base);
+ spin_lock_init(&p->lock);
+ platform_set_drvdata(pdev, p);
+
+ p->chip.ngpio = 4; /* 2 cs pins for spi0, and 2 for spi1 */
+ p->chip.base = -1;
+ p->chip.direction_input = elba_spics_direction_input;
+ p->chip.direction_output = elba_spics_direction_output;
+ p->chip.get = elba_spics_get_value;
+ p->chip.set = elba_spics_set_value;
+ p->chip.label = dev_name(&pdev->dev);
+ p->chip.parent = &pdev->dev;
+ p->chip.owner = THIS_MODULE;
+
+ ret = devm_gpiochip_add_data(&pdev->dev, &p->chip, p);
+ if (ret)
+ dev_err(&pdev->dev, "unable to add gpio chip\n");
+ return ret;
+}
+
+static const struct of_device_id elba_spics_of_match[] = {
+ { .compatible = "pensando,elba-spics" },
+ {}
+};
+
+static struct platform_driver elba_spics_driver = {
+ .probe = elba_spics_probe,
+ .driver = {
+ .name = "pensando-elba-spics",
+ .of_match_table = elba_spics_of_match,
+ },
+};
+module_platform_driver(elba_spics_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Pensando Elba SoC SPI chip-select driver");
--
2.17.1
next prev parent reply other threads:[~2021-03-29 2:00 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-29 1:59 [PATCH v2 00/13] Support Pensando Elba SoC Brad Larson
2021-03-29 1:59 ` Brad Larson [this message]
2021-03-29 10:41 ` [PATCH v2 01/13] gpio: Add Elba SoC gpio driver for spi cs control Andy Shevchenko
2021-08-23 1:22 ` Brad Larson
2021-03-29 13:46 ` Linus Walleij
2021-03-31 18:10 ` Serge Semin
2021-08-23 1:24 ` Brad Larson
2021-03-29 1:59 ` [PATCH v2 02/13] spi: cadence-quadspi: Add QSPI support for Pensando Elba SoC Brad Larson
2021-03-30 11:13 ` Pratyush Yadav
2021-03-29 1:59 ` [PATCH v2 03/13] spi: dw: Add support for Pensando Elba SoC SPI Brad Larson
2021-03-29 10:43 ` Andy Shevchenko
2021-08-23 1:25 ` Brad Larson
2021-03-29 15:58 ` Mark Brown
2021-03-30 2:28 ` Brad Larson
2021-03-31 18:00 ` Serge Semin
2021-08-23 1:26 ` Brad Larson
2021-03-29 1:59 ` [PATCH v2 04/13] spidev: Add Pensando CPLD compatible Brad Larson
2021-03-29 10:44 ` Andy Shevchenko
2021-03-30 3:27 ` Brad Larson
2021-03-29 1:59 ` [PATCH v2 05/13] mmc: sdhci-cadence: Add Pensando Elba SoC support Brad Larson
2021-03-30 10:30 ` Ulf Hansson
2021-04-09 8:24 ` Masahiro Yamada
2021-08-23 1:31 ` Brad Larson
2021-08-23 1:28 ` Brad Larson
2021-03-29 1:59 ` [PATCH v2 06/13] arm64: Add config for Pensando SoC platforms Brad Larson
2021-03-29 1:59 ` [PATCH v2 07/13] arm64: dts: Add Pensando Elba SoC support Brad Larson
2021-03-30 21:55 ` Rob Herring
2021-08-23 1:36 ` Brad Larson
2021-03-31 17:51 ` Serge Semin
2021-08-23 1:55 ` Brad Larson
2021-03-29 1:59 ` [PATCH v2 08/13] dt-bindings: Add pensando vendor prefix Brad Larson
2021-03-30 21:56 ` Rob Herring
2021-03-29 1:59 ` [PATCH v2 09/13] dt-bindings: mmc: Add Pensando Elba SoC binding Brad Larson
2021-03-30 21:56 ` Rob Herring
2021-03-29 1:59 ` [PATCH v2 10/13] dt-bindings: spi: cadence-qspi: Add support for Pensando Elba SoC Brad Larson
2021-03-29 16:00 ` Mark Brown
2021-03-30 2:12 ` Brad Larson
2021-03-30 11:12 ` Pratyush Yadav
2021-08-23 1:57 ` Brad Larson
2021-03-29 1:59 ` [PATCH v2 11/13] dt-bindings: gpio: Add Pensando Elba SoC support Brad Larson
2021-03-29 1:59 ` [PATCH v2 12/13] MAINTAINERS: Add entry for PENSANDO Brad Larson
2021-03-29 1:59 ` [PATCH v2 13/13] gpio: Use linux/gpio/driver.h Brad Larson
2021-03-29 6:48 ` Greg KH
2021-03-30 2:20 ` Brad Larson
2021-03-29 13:44 ` Linus Walleij
2021-03-30 2:21 ` Brad Larson
2021-03-31 16:17 ` [PATCH v2 00/13] Support Pensando Elba SoC Serge Semin
2021-08-23 1:18 ` Brad Larson
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