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Message-ID: <17be05570905301105h395689ja33afa96e7751381@mail.gmail.com>
Date: Sat, 30 May 2009 20:05:52 +0200
From: Tobias Müller <Tobias_Mueller@...m.info>
To: Andrew Morton <akpm@...ux-foundation.org>,
David Brownell <david-b@...bell.net>,
Jordan Crouse <jordan@...micpenguin.net>,
Ben Gardner <gardner.ben@...il.com>,
linux-kernel@...r.kernel.org
Subject: [PATCH v2 001/001] gpio: AMD CS5535/CS5536 GPIO driver
From: Tobias Mueller <Tobias_Mueller@...m.info>
A GPIO driver for AMD Geode Companion Device CS5535/CS5536
using the GPIO framework as a replacement for old cs5535-gpio driver.
Signed-off-by: Tobias Mueller <Tobias_Mueller@...m.info>
---
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index edb0253..0b7ef6f 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -67,6 +67,14 @@ config GPIO_SYSFS
comment "Memory mapped GPIO expanders:"
+config GPIO_CS5535
+ tristate "AMD CS5535/CS5536 (Geode Companion Device)"
+ depends on !CONFIG_CS5535_GPIO && X86 && EXPERIMENTAL
+ default N
+ help
+ Say yes here to support GPIO pins of AMD CS5535/CS5536
+ (Geode Companion Device)
+
config GPIO_XILINX
bool "Xilinx GPIO support"
depends on PPC_OF
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 49ac64e..949c723 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -12,3 +12,4 @@ obj-$(CONFIG_GPIO_PCF857X) += pcf857x.o
obj-$(CONFIG_GPIO_TWL4030) += twl4030-gpio.o
obj-$(CONFIG_GPIO_XILINX) += xilinx_gpio.o
obj-$(CONFIG_GPIO_BT8XX) += bt8xxgpio.o
+obj-$(CONFIG_GPIO_CS5535) += gpio_cs5535.o
diff --git a/drivers/gpio/gpio_cs5535.c b/drivers/gpio/gpio_cs5535.c
new file mode 100644
index 0000000..f7361e1
--- /dev/null
+++ b/drivers/gpio/gpio_cs5535.c
@@ -0,0 +1,342 @@
+/*
+ CS5535/CS5536 GPIO driver
+
+ Copyright (C) 2009 Tobias Mueller <Tobias_Mueller@...m.info>
+
+
+ Derived from the the cs5535_gpio (char) driver:
+
+ Copyright (c) 2005 Ben Gardner <bgardner@...tec.com>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/gpio.h>
+
+#define GPIO_CS5535_NAME "gpio_cs5535"
+#define GPIO_CS5535_SIZE 256 /* size of I/O area */
+#define GPIO_CS5535_LBAR_GPIO 0x5140000C /* p. 385 of datasheet */
+#define GPIO_CS5535_OUT_VAL 0x00 /* output value */
+#define GPIO_CS5535_OUT_EN 0x04 /* output enable */
+#define GPIO_CS5535_OD_EN 0x08 /* open-drain enable */
+#define GPIO_CS5535_OUT_AUX1 0x10 /* output aux 1 select */
+#define GPIO_CS5535_OUT_AUX2 0x14 /* output aux 2 select */
+#define GPIO_CS5535_OUT_PU_EN 0x18 /* pull-up enable */
+#define GPIO_CS5535_OUT_PD_EN 0x1C /* poll-down eable */
+#define GPIO_CS5535_IN_EN 0x20 /* input enable */
+#define GPIO_CS5535_READ_BACK 0x30 /* read back */
+#define GPIO_CS5535_IN_AUX1 0x34 /* input aux 1 select */
+
+/**
+* Some GPIO pins
+* 31-29,23 : reserved (always mask out)
+* 28 : Power Button
+* 26 : PME#
+* 22-16 : LPC
+* 14,15 : SMBus
+* 9,8 : UART1
+* 7 : PCI INTB
+* 3,4 : UART2/DDC
+* 2 : IDE_IRQ0
+* 1 : AC_BEEP
+* 0 : PCI INTA
+*
+* If a mask was not specified, be conservative and only allow:
+* 1,2,5,6,10-13,24,25,27
+*/
+
+#ifndef GPIO_CS5535_DEF_MASK
+#define GPIO_CS5535_DEF_MASK 0x0B003C66
+#endif
+
+static struct pci_device_id gpio_cs5535_pci_tbl[] = {
+ { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_CS5535_ISA) },
+ { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_ISA) },
+ { } /* NULL entry */
+};
+
+/* pin names */
+static char *gpio_cs5535_names[] = {
+ "GPIO0", "GPIO1", "GPIO2", "GPIO3",
+ "GPIO4", "GPIO5", "GPIO6", "GPIO7",
+ "GPIO8", "GPIO9", "GPIO10", "GPIO11",
+ "GPIO12", "GPIO13", "GPIO14", "GPIO15",
+ "GPIO16", "GPIO17", "GPIO18", "GPIO19",
+ "GPIO20", "GPIO21", "GPIO22", NULL,
+ "GPIO24", "GPIO25", "GPIO26", "GPIO27",
+ "GPIO28", NULL, NULL, NULL,
+};
+
+struct gpio_cs5535 {
+ struct pci_dev *pdev;
+ struct gpio_chip gpio;
+};
+
+/* base address of gpio I/O*/
+static u32 iobase;
+
+static int gpiobase;
+module_param_named(gpiobase, gpiobase, int, 0444);
+MODULE_PARM_DESC(gpiobase, "The GPIO number base. -1 means dynamic");
+
+static ulong mask;
+module_param_named(mask, mask, ulong, 0444);
+MODULE_PARM_DESC(mask, "GPIO channel mask.");
+
+/* gets the regiter offset for the GPIO bank.
+ * low (0-15) stats at 0x00, high (16-31) starts at 0x80 */
+static inline u32 gpio_cs5535_lowhigh_base(int offset)
+{
+ return (offset & 0x10) << 3;
+}
+
+/* optional hook for chip-specific activation, such as
+ * enabling module power and clock; may sleep */
+static int gpio_cs5535_request(struct gpio_chip *chip, unsigned offset)
+{
+ u32 on, off;
+
+ on = 1 << (offset & 0x0F);
+ off = on << 16;
+
+ /* check if this pin is available */
+ if ((mask & (1 << offset)) == 0) {
+ printk(KERN_INFO GPIO_CS5535_NAME
+ ": pin %u is not available\n", offset);
+ return -EINVAL;
+ }
+
+ /* disable output aux 1 & 2 on this pin */
+ outl(off, iobase+gpio_cs5535_lowhigh_base(offset)
+ +GPIO_CS5535_OUT_AUX1);
+ outl(off, iobase+gpio_cs5535_lowhigh_base(offset)
+ +GPIO_CS5535_OUT_AUX2);
+
+ /* disable input aux 1 on this pin */
+ outl(off, iobase+gpio_cs5535_lowhigh_base(offset)
+ +GPIO_CS5535_IN_AUX1);
+
+ /* disable output */
+ outl(off, iobase+gpio_cs5535_lowhigh_base(offset)
+ +GPIO_CS5535_OUT_EN);
+
+ /* enable input */
+ outl(on, iobase+gpio_cs5535_lowhigh_base(offset)
+ +GPIO_CS5535_IN_EN);
+
+ return 0;
+}
+
+/* configures signal "offset" as input, or returns error */
+static int gpio_cs5535_direction_input(struct gpio_chip *chip,
+ unsigned offset)
+{
+ u32 on, off;
+
+ on = 1 << (offset & 0x0F);
+ off = on << 16;
+
+ /* disable output */
+ outl(off, iobase+gpio_cs5535_lowhigh_base(offset)
+ +GPIO_CS5535_OUT_EN);
+
+ /* enable input */
+ outl(on, iobase+gpio_cs5535_lowhigh_base(offset)
+ +GPIO_CS5535_IN_EN);
+
+ return 0;
+}
+
+/* returns value for signal "offset"; for output signals this
+ * returns either the value actually sensed, or zero */
+static int gpio_cs5535_get(struct gpio_chip *chip, unsigned offset)
+{
+ u32 bit;
+
+ bit = 1 << (offset & 0x0F);
+
+ return inl(iobase+gpio_cs5535_lowhigh_base(offset)
+ +GPIO_CS5535_READ_BACK) & bit;
+}
+
+/* configures signal "offset" as output, or returns error */
+static int gpio_cs5535_direction_output(struct gpio_chip *chip,
+ unsigned offset, int value)
+{
+ u32 on, off;
+
+ on = 1 << (offset & 0x0F);
+ off = on << 16;
+
+ /* disable input */
+ outl(off, iobase+gpio_cs5535_lowhigh_base(offset)
+ +GPIO_CS5535_IN_EN);
+
+ /* set value */
+ outl(value ? on : off, iobase+gpio_cs5535_lowhigh_base(offset)
+ +GPIO_CS5535_OUT_VAL);
+
+ /* enable output */
+ outl(on, iobase+gpio_cs5535_lowhigh_base(offset)
+ +GPIO_CS5535_OUT_EN);
+
+ return 0;
+}
+
+/* assigns output value for signal "offset" */
+static void gpio_cs5535_set(struct gpio_chip *chip, unsigned offset, int value)
+{
+ u32 on, off;
+
+ on = 1 << (offset & 0x0F);
+ off = on << 16;
+
+ /* set value */
+ outl(value ? on : off, iobase+gpio_cs5535_lowhigh_base(offset)
+ +GPIO_CS5535_OUT_VAL);
+}
+
+/* setups gpio_chip object */
+static void gpio_cs5535_setup(struct gpio_cs5535 *cs5535)
+{
+ struct gpio_chip *c = &cs5535->gpio;
+
+ c->label = dev_name(&cs5535->pdev->dev);
+ c->owner = THIS_MODULE;
+ c->request = gpio_cs5535_request;
+ c->direction_input = gpio_cs5535_direction_input;
+ c->get = gpio_cs5535_get;
+ c->direction_output = gpio_cs5535_direction_output;
+ c->set = gpio_cs5535_set;
+ c->dbg_show = NULL;
+ c->base = gpiobase;
+ c->ngpio = 32;
+ c->can_sleep = 0;
+ c->names = gpio_cs5535_names;
+}
+
+static int gpio_cs5535_probe(struct pci_dev *pdev,
+ const struct pci_device_id *pciid)
+{
+ struct gpio_cs5535 *cs5535;
+ u32 low, hi;
+ u32 mask_orig = mask;
+ int err;
+
+ cs5535 = kzalloc(sizeof(*cs5535), GFP_KERNEL);
+ if (!cs5535)
+ return -ENOMEM;
+
+ cs5535->pdev = pdev;
+
+ pci_set_drvdata(pdev, cs5535);
+
+ /* Grab the GPIO I/O range */
+ rdmsr(GPIO_CS5535_LBAR_GPIO, low, hi);
+
+ /* Check the mask and whether GPIO is enabled (sanity check) */
+ if (hi != 0x0000f001) {
+ printk(KERN_WARNING GPIO_CS5535_NAME
+ ": GPIO not enabled\n");
+ err = -ENODEV;
+ goto err_release_mem;
+ }
+
+ iobase = low & 0x000ff00;
+
+ if (!request_region(iobase, GPIO_CS5535_SIZE, GPIO_CS5535_NAME)) {
+ printk(KERN_ERR GPIO_CS5535_NAME
+ ": Can't allocate I/O for GPIO\n");
+ err = -ENODEV;
+ goto err_release_mem;
+ }
+
+ if (mask != 0)
+ mask &= 0x1F7FFFFF; /* mask out reserved */
+ else
+ mask = GPIO_CS5535_DEF_MASK;
+
+ /* do not allow pin 28, Power Button, as there's special handling
+ * in the PMC needed. (note 12, p. 48) */
+ mask &= ~(1 << 28);
+
+ if (mask_orig != mask)
+ printk(KERN_INFO GPIO_CS5535_NAME
+ ": mask changed from 0x%08lX to 0x%08lX\n",
+ mask_orig, mask);
+
+ gpio_cs5535_setup(cs5535);
+
+ err = gpiochip_add(&cs5535->gpio);
+ if (err) {
+ printk(KERN_ERR GPIO_CS5535_NAME
+ ": Failed to register GPIOs\n");
+ goto err_release_mem;
+ }
+
+ return 0;
+
+err_release_mem:
+ pci_set_drvdata(pdev, NULL);
+ kfree(cs5535);
+
+ return err;
+}
+
+static void gpio_cs5535_remove(struct pci_dev *pdev)
+{
+ struct gpio_cs5535 *cs5535 = pci_get_drvdata(pdev);
+ int status = 0;
+
+ status = gpiochip_remove(&cs5535->gpio);
+
+ if (status == 0) {
+ pci_set_drvdata(pdev, NULL);
+ release_region(iobase, GPIO_CS5535_SIZE);
+ kfree(cs5535);
+ } else {
+ dev_err(&pdev->dev, "%s --> %d\n", "remove", status);
+ }
+}
+
+#define gpio_cs5535_suspend NULL
+#define gpio_cs5535_resume NULL
+
+static struct pci_driver gpio_cs5535_driver = {
+ .name = "gpio_cs5535",
+ .id_table = gpio_cs5535_pci_tbl,
+ .probe = gpio_cs5535_probe,
+ .remove = gpio_cs5535_remove,
+ .suspend = gpio_cs5535_suspend,
+ .resume = gpio_cs5535_resume,
+};
+
+static int __init gpio_cs5535_init(void)
+{
+ return pci_register_driver(&gpio_cs5535_driver);
+}
+module_init(gpio_cs5535_init)
+
+static void __exit gpio_cs5535_exit(void)
+{
+ pci_unregister_driver(&gpio_cs5535_driver);
+}
+module_exit(gpio_cs5535_exit);
+
+MODULE_AUTHOR("Tobias Mueller <Tobias_Mueller@...m.info>");
+MODULE_DESCRIPTION("AMD CS5535/CS5536 GPIO driver");
+MODULE_LICENSE("GPL");
--
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