![Linus Torvalds](/assets/img/avatar_default.png)
Here's the set of driver core patches for 3.19-rc1. They are dominated by the removal of the .owner field in platform drivers. They touch a lot of files, but they are "simple" changes, just removing a line in a structure. Other than that, a few minor driver core and debugfs changes. There are some ath9k patches coming in through this tree that have been acked by the wireless maintainers as they relied on the debugfs changes. Everything has been in linux-next for a while. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iEYEABECAAYFAlSOD20ACgkQMUfUDdst+ylLPACg2QrW1oHhdTMT9WI8jihlHVRM 53kAoLeteByQ3iVwWurwwseRPiWa8+MI =OVRS -----END PGP SIGNATURE----- Merge tag 'driver-core-3.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core Pull driver core update from Greg KH: "Here's the set of driver core patches for 3.19-rc1. They are dominated by the removal of the .owner field in platform drivers. They touch a lot of files, but they are "simple" changes, just removing a line in a structure. Other than that, a few minor driver core and debugfs changes. There are some ath9k patches coming in through this tree that have been acked by the wireless maintainers as they relied on the debugfs changes. Everything has been in linux-next for a while" * tag 'driver-core-3.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (324 commits) Revert "ath: ath9k: use debugfs_create_devm_seqfile() helper for seq_file entries" fs: debugfs: add forward declaration for struct device type firmware class: Deletion of an unnecessary check before the function call "vunmap" firmware loader: fix hung task warning dump devcoredump: provide a one-way disable function device: Add dev_<level>_once variants ath: ath9k: use debugfs_create_devm_seqfile() helper for seq_file entries ath: use seq_file api for ath9k debugfs files debugfs: add helper function to create device related seq_file drivers/base: cacheinfo: remove noisy error boot message Revert "core: platform: add warning if driver has no owner" drivers: base: support cpu cache information interface to userspace via sysfs drivers: base: add cpu_device_create to support per-cpu devices topology: replace custom attribute macros with standard DEVICE_ATTR* cpumask: factor out show_cpumap into separate helper function driver core: Fix unbalanced device reference in drivers_probe driver core: fix race with userland in device_add() sysfs/kernfs: make read requests on pre-alloc files use the buffer. sysfs/kernfs: allow attributes to request write buffer be pre-allocated. fs: sysfs: return EGBIG on write if offset is larger than file size ...
371 lines
9.8 KiB
C
371 lines
9.8 KiB
C
/*
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* MXC GPIO support. (c) 2008 Daniel Mack <daniel@caiaq.de>
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* Copyright 2008 Juergen Beisert, kernel@pengutronix.de
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*
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* Based on code from Freescale,
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* Copyright (C) 2004-2010 Freescale Semiconductor, Inc. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*/
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/irq.h>
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#include <linux/irqdomain.h>
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#include <linux/gpio.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/basic_mmio_gpio.h>
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#include <linux/module.h>
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#define MXS_SET 0x4
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#define MXS_CLR 0x8
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#define PINCTRL_DOUT(p) ((is_imx23_gpio(p) ? 0x0500 : 0x0700) + (p->id) * 0x10)
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#define PINCTRL_DIN(p) ((is_imx23_gpio(p) ? 0x0600 : 0x0900) + (p->id) * 0x10)
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#define PINCTRL_DOE(p) ((is_imx23_gpio(p) ? 0x0700 : 0x0b00) + (p->id) * 0x10)
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#define PINCTRL_PIN2IRQ(p) ((is_imx23_gpio(p) ? 0x0800 : 0x1000) + (p->id) * 0x10)
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#define PINCTRL_IRQEN(p) ((is_imx23_gpio(p) ? 0x0900 : 0x1100) + (p->id) * 0x10)
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#define PINCTRL_IRQLEV(p) ((is_imx23_gpio(p) ? 0x0a00 : 0x1200) + (p->id) * 0x10)
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#define PINCTRL_IRQPOL(p) ((is_imx23_gpio(p) ? 0x0b00 : 0x1300) + (p->id) * 0x10)
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#define PINCTRL_IRQSTAT(p) ((is_imx23_gpio(p) ? 0x0c00 : 0x1400) + (p->id) * 0x10)
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#define GPIO_INT_FALL_EDGE 0x0
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#define GPIO_INT_LOW_LEV 0x1
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#define GPIO_INT_RISE_EDGE 0x2
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#define GPIO_INT_HIGH_LEV 0x3
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#define GPIO_INT_LEV_MASK (1 << 0)
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#define GPIO_INT_POL_MASK (1 << 1)
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enum mxs_gpio_id {
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IMX23_GPIO,
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IMX28_GPIO,
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};
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struct mxs_gpio_port {
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void __iomem *base;
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int id;
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int irq;
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struct irq_domain *domain;
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struct bgpio_chip bgc;
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enum mxs_gpio_id devid;
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u32 both_edges;
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};
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static inline int is_imx23_gpio(struct mxs_gpio_port *port)
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{
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return port->devid == IMX23_GPIO;
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}
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static inline int is_imx28_gpio(struct mxs_gpio_port *port)
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{
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return port->devid == IMX28_GPIO;
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}
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/* Note: This driver assumes 32 GPIOs are handled in one register */
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static int mxs_gpio_set_irq_type(struct irq_data *d, unsigned int type)
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{
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u32 val;
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u32 pin_mask = 1 << d->hwirq;
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struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
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struct mxs_gpio_port *port = gc->private;
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void __iomem *pin_addr;
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int edge;
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port->both_edges &= ~pin_mask;
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switch (type) {
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case IRQ_TYPE_EDGE_BOTH:
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val = gpio_get_value(port->bgc.gc.base + d->hwirq);
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if (val)
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edge = GPIO_INT_FALL_EDGE;
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else
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edge = GPIO_INT_RISE_EDGE;
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port->both_edges |= pin_mask;
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break;
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case IRQ_TYPE_EDGE_RISING:
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edge = GPIO_INT_RISE_EDGE;
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break;
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case IRQ_TYPE_EDGE_FALLING:
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edge = GPIO_INT_FALL_EDGE;
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break;
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case IRQ_TYPE_LEVEL_LOW:
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edge = GPIO_INT_LOW_LEV;
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break;
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case IRQ_TYPE_LEVEL_HIGH:
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edge = GPIO_INT_HIGH_LEV;
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break;
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default:
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return -EINVAL;
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}
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/* set level or edge */
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pin_addr = port->base + PINCTRL_IRQLEV(port);
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if (edge & GPIO_INT_LEV_MASK)
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writel(pin_mask, pin_addr + MXS_SET);
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else
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writel(pin_mask, pin_addr + MXS_CLR);
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/* set polarity */
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pin_addr = port->base + PINCTRL_IRQPOL(port);
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if (edge & GPIO_INT_POL_MASK)
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writel(pin_mask, pin_addr + MXS_SET);
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else
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writel(pin_mask, pin_addr + MXS_CLR);
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writel(pin_mask,
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port->base + PINCTRL_IRQSTAT(port) + MXS_CLR);
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return 0;
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}
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static void mxs_flip_edge(struct mxs_gpio_port *port, u32 gpio)
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{
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u32 bit, val, edge;
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void __iomem *pin_addr;
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bit = 1 << gpio;
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pin_addr = port->base + PINCTRL_IRQPOL(port);
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val = readl(pin_addr);
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edge = val & bit;
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if (edge)
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writel(bit, pin_addr + MXS_CLR);
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else
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writel(bit, pin_addr + MXS_SET);
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}
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/* MXS has one interrupt *per* gpio port */
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static void mxs_gpio_irq_handler(u32 irq, struct irq_desc *desc)
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{
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u32 irq_stat;
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struct mxs_gpio_port *port = irq_get_handler_data(irq);
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desc->irq_data.chip->irq_ack(&desc->irq_data);
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irq_stat = readl(port->base + PINCTRL_IRQSTAT(port)) &
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readl(port->base + PINCTRL_IRQEN(port));
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while (irq_stat != 0) {
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int irqoffset = fls(irq_stat) - 1;
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if (port->both_edges & (1 << irqoffset))
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mxs_flip_edge(port, irqoffset);
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generic_handle_irq(irq_find_mapping(port->domain, irqoffset));
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irq_stat &= ~(1 << irqoffset);
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}
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}
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/*
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* Set interrupt number "irq" in the GPIO as a wake-up source.
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* While system is running, all registered GPIO interrupts need to have
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* wake-up enabled. When system is suspended, only selected GPIO interrupts
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* need to have wake-up enabled.
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* @param irq interrupt source number
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* @param enable enable as wake-up if equal to non-zero
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* @return This function returns 0 on success.
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*/
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static int mxs_gpio_set_wake_irq(struct irq_data *d, unsigned int enable)
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{
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struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
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struct mxs_gpio_port *port = gc->private;
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if (enable)
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enable_irq_wake(port->irq);
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else
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disable_irq_wake(port->irq);
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return 0;
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}
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static void __init mxs_gpio_init_gc(struct mxs_gpio_port *port, int irq_base)
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{
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struct irq_chip_generic *gc;
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struct irq_chip_type *ct;
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gc = irq_alloc_generic_chip("gpio-mxs", 1, irq_base,
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port->base, handle_level_irq);
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gc->private = port;
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ct = gc->chip_types;
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ct->chip.irq_ack = irq_gc_ack_set_bit;
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ct->chip.irq_mask = irq_gc_mask_clr_bit;
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ct->chip.irq_unmask = irq_gc_mask_set_bit;
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ct->chip.irq_set_type = mxs_gpio_set_irq_type;
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ct->chip.irq_set_wake = mxs_gpio_set_wake_irq;
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ct->regs.ack = PINCTRL_IRQSTAT(port) + MXS_CLR;
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ct->regs.mask = PINCTRL_IRQEN(port);
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irq_setup_generic_chip(gc, IRQ_MSK(32), IRQ_GC_INIT_NESTED_LOCK,
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IRQ_NOREQUEST, 0);
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}
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static int mxs_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
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{
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struct bgpio_chip *bgc = to_bgpio_chip(gc);
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struct mxs_gpio_port *port =
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container_of(bgc, struct mxs_gpio_port, bgc);
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return irq_find_mapping(port->domain, offset);
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}
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static int mxs_gpio_get_direction(struct gpio_chip *gc, unsigned offset)
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{
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struct bgpio_chip *bgc = to_bgpio_chip(gc);
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struct mxs_gpio_port *port =
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container_of(bgc, struct mxs_gpio_port, bgc);
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u32 mask = 1 << offset;
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u32 dir;
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dir = readl(port->base + PINCTRL_DOE(port));
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return !(dir & mask);
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}
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static struct platform_device_id mxs_gpio_ids[] = {
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{
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.name = "imx23-gpio",
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.driver_data = IMX23_GPIO,
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}, {
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.name = "imx28-gpio",
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.driver_data = IMX28_GPIO,
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}, {
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/* sentinel */
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}
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};
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MODULE_DEVICE_TABLE(platform, mxs_gpio_ids);
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static const struct of_device_id mxs_gpio_dt_ids[] = {
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{ .compatible = "fsl,imx23-gpio", .data = (void *) IMX23_GPIO, },
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{ .compatible = "fsl,imx28-gpio", .data = (void *) IMX28_GPIO, },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, mxs_gpio_dt_ids);
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static int mxs_gpio_probe(struct platform_device *pdev)
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{
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const struct of_device_id *of_id =
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of_match_device(mxs_gpio_dt_ids, &pdev->dev);
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struct device_node *np = pdev->dev.of_node;
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struct device_node *parent;
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static void __iomem *base;
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struct mxs_gpio_port *port;
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int irq_base;
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int err;
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port = devm_kzalloc(&pdev->dev, sizeof(*port), GFP_KERNEL);
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if (!port)
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return -ENOMEM;
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port->id = of_alias_get_id(np, "gpio");
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if (port->id < 0)
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return port->id;
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port->devid = (enum mxs_gpio_id) of_id->data;
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port->irq = platform_get_irq(pdev, 0);
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if (port->irq < 0)
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return port->irq;
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/*
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* map memory region only once, as all the gpio ports
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* share the same one
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*/
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if (!base) {
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parent = of_get_parent(np);
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base = of_iomap(parent, 0);
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of_node_put(parent);
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if (!base)
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return -EADDRNOTAVAIL;
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}
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port->base = base;
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/*
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* select the pin interrupt functionality but initially
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* disable the interrupts
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*/
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writel(~0U, port->base + PINCTRL_PIN2IRQ(port));
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writel(0, port->base + PINCTRL_IRQEN(port));
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/* clear address has to be used to clear IRQSTAT bits */
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writel(~0U, port->base + PINCTRL_IRQSTAT(port) + MXS_CLR);
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irq_base = irq_alloc_descs(-1, 0, 32, numa_node_id());
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if (irq_base < 0)
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return irq_base;
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port->domain = irq_domain_add_legacy(np, 32, irq_base, 0,
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&irq_domain_simple_ops, NULL);
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if (!port->domain) {
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err = -ENODEV;
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goto out_irqdesc_free;
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}
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/* gpio-mxs can be a generic irq chip */
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mxs_gpio_init_gc(port, irq_base);
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/* setup one handler for each entry */
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irq_set_chained_handler(port->irq, mxs_gpio_irq_handler);
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irq_set_handler_data(port->irq, port);
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err = bgpio_init(&port->bgc, &pdev->dev, 4,
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port->base + PINCTRL_DIN(port),
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port->base + PINCTRL_DOUT(port) + MXS_SET,
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port->base + PINCTRL_DOUT(port) + MXS_CLR,
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port->base + PINCTRL_DOE(port), NULL, 0);
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if (err)
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goto out_irqdesc_free;
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port->bgc.gc.to_irq = mxs_gpio_to_irq;
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port->bgc.gc.get_direction = mxs_gpio_get_direction;
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port->bgc.gc.base = port->id * 32;
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err = gpiochip_add(&port->bgc.gc);
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if (err)
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goto out_bgpio_remove;
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return 0;
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out_bgpio_remove:
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bgpio_remove(&port->bgc);
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out_irqdesc_free:
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irq_free_descs(irq_base, 32);
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return err;
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}
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static struct platform_driver mxs_gpio_driver = {
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.driver = {
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.name = "gpio-mxs",
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.of_match_table = mxs_gpio_dt_ids,
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},
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.probe = mxs_gpio_probe,
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.id_table = mxs_gpio_ids,
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};
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static int __init mxs_gpio_init(void)
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{
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return platform_driver_register(&mxs_gpio_driver);
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}
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postcore_initcall(mxs_gpio_init);
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MODULE_AUTHOR("Freescale Semiconductor, "
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"Daniel Mack <danielncaiaq.de>, "
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"Juergen Beisert <kernel@pengutronix.de>");
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MODULE_DESCRIPTION("Freescale MXS GPIO");
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MODULE_LICENSE("GPL");
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