Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 1 | /* |
| 2 | * MXC GPIO support. (c) 2008 Daniel Mack <daniel@caiaq.de> |
| 3 | * Copyright 2008 Juergen Beisert, kernel@pengutronix.de |
| 4 | * |
| 5 | * Based on code from Freescale, |
Dinh Nguyen | e24798e | 2010-04-22 16:28:42 +0300 | [diff] [blame] | 6 | * Copyright (C) 2004-2010 Freescale Semiconductor, Inc. All Rights Reserved. |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 7 | * |
| 8 | * This program is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU General Public License |
| 10 | * as published by the Free Software Foundation; either version 2 |
| 11 | * of the License, or (at your option) any later version. |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License |
| 18 | * along with this program; if not, write to the Free Software |
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 20 | */ |
| 21 | |
| 22 | #include <linux/init.h> |
Dinh Nguyen | a3484ff | 2010-10-23 09:12:48 -0500 | [diff] [blame] | 23 | #include <linux/interrupt.h> |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 24 | #include <linux/io.h> |
| 25 | #include <linux/irq.h> |
| 26 | #include <linux/gpio.h> |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame^] | 27 | #include <linux/platform_device.h> |
| 28 | #include <linux/slab.h> |
Russell King | a09e64f | 2008-08-05 16:14:15 +0100 | [diff] [blame] | 29 | #include <mach/hardware.h> |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 30 | #include <asm-generic/bug.h> |
| 31 | |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame^] | 32 | struct mxc_gpio_port { |
| 33 | struct list_head node; |
| 34 | void __iomem *base; |
| 35 | int irq; |
| 36 | int irq_high; |
| 37 | int virtual_irq_start; |
| 38 | struct gpio_chip chip; |
| 39 | u32 both_edges; |
| 40 | spinlock_t lock; |
| 41 | }; |
| 42 | |
| 43 | /* |
| 44 | * MX2 has one interrupt *for all* gpio ports. The list is used |
| 45 | * to save the references to all ports, so that mx2_gpio_irq_handler |
| 46 | * can walk through all interrupt status registers. |
| 47 | */ |
| 48 | static LIST_HEAD(mxc_gpio_ports); |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 49 | |
Sascha Hauer | 494f22d | 2009-05-27 18:26:51 +0200 | [diff] [blame] | 50 | #define cpu_is_mx1_mx2() (cpu_is_mx1() || cpu_is_mx2()) |
| 51 | |
| 52 | #define GPIO_DR (cpu_is_mx1_mx2() ? 0x1c : 0x00) |
| 53 | #define GPIO_GDIR (cpu_is_mx1_mx2() ? 0x00 : 0x04) |
| 54 | #define GPIO_PSR (cpu_is_mx1_mx2() ? 0x24 : 0x08) |
| 55 | #define GPIO_ICR1 (cpu_is_mx1_mx2() ? 0x28 : 0x0C) |
| 56 | #define GPIO_ICR2 (cpu_is_mx1_mx2() ? 0x2C : 0x10) |
| 57 | #define GPIO_IMR (cpu_is_mx1_mx2() ? 0x30 : 0x14) |
| 58 | #define GPIO_ISR (cpu_is_mx1_mx2() ? 0x34 : 0x18) |
Sascha Hauer | 494f22d | 2009-05-27 18:26:51 +0200 | [diff] [blame] | 59 | |
| 60 | #define GPIO_INT_LOW_LEV (cpu_is_mx1_mx2() ? 0x3 : 0x0) |
| 61 | #define GPIO_INT_HIGH_LEV (cpu_is_mx1_mx2() ? 0x2 : 0x1) |
| 62 | #define GPIO_INT_RISE_EDGE (cpu_is_mx1_mx2() ? 0x0 : 0x2) |
| 63 | #define GPIO_INT_FALL_EDGE (cpu_is_mx1_mx2() ? 0x1 : 0x3) |
| 64 | #define GPIO_INT_NONE 0x4 |
| 65 | |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 66 | /* Note: This driver assumes 32 GPIOs are handled in one register */ |
| 67 | |
| 68 | static void _clear_gpio_irqstatus(struct mxc_gpio_port *port, u32 index) |
| 69 | { |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame^] | 70 | writel(1 << index, port->base + GPIO_ISR); |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 71 | } |
| 72 | |
| 73 | static void _set_gpio_irqenable(struct mxc_gpio_port *port, u32 index, |
| 74 | int enable) |
| 75 | { |
| 76 | u32 l; |
| 77 | |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame^] | 78 | l = readl(port->base + GPIO_IMR); |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 79 | l = (l & (~(1 << index))) | (!!enable << index); |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame^] | 80 | writel(l, port->base + GPIO_IMR); |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 81 | } |
| 82 | |
Lennert Buytenhek | 4d93579 | 2010-11-29 11:16:23 +0100 | [diff] [blame] | 83 | static void gpio_ack_irq(struct irq_data *d) |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 84 | { |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame^] | 85 | struct mxc_gpio_port *port = irq_data_get_irq_chip_data(d); |
Lennert Buytenhek | 4d93579 | 2010-11-29 11:16:23 +0100 | [diff] [blame] | 86 | u32 gpio = irq_to_gpio(d->irq); |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame^] | 87 | _clear_gpio_irqstatus(port, gpio & 0x1f); |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 88 | } |
| 89 | |
Lennert Buytenhek | 4d93579 | 2010-11-29 11:16:23 +0100 | [diff] [blame] | 90 | static void gpio_mask_irq(struct irq_data *d) |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 91 | { |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame^] | 92 | struct mxc_gpio_port *port = irq_data_get_irq_chip_data(d); |
Lennert Buytenhek | 4d93579 | 2010-11-29 11:16:23 +0100 | [diff] [blame] | 93 | u32 gpio = irq_to_gpio(d->irq); |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame^] | 94 | _set_gpio_irqenable(port, gpio & 0x1f, 0); |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 95 | } |
| 96 | |
Lennert Buytenhek | 4d93579 | 2010-11-29 11:16:23 +0100 | [diff] [blame] | 97 | static void gpio_unmask_irq(struct irq_data *d) |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 98 | { |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame^] | 99 | struct mxc_gpio_port *port = irq_data_get_irq_chip_data(d); |
Lennert Buytenhek | 4d93579 | 2010-11-29 11:16:23 +0100 | [diff] [blame] | 100 | u32 gpio = irq_to_gpio(d->irq); |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame^] | 101 | _set_gpio_irqenable(port, gpio & 0x1f, 1); |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 102 | } |
| 103 | |
Guennadi Liakhovetski | 910862e | 2009-03-12 12:46:41 +0100 | [diff] [blame] | 104 | static int mxc_gpio_get(struct gpio_chip *chip, unsigned offset); |
| 105 | |
Lennert Buytenhek | 4d93579 | 2010-11-29 11:16:23 +0100 | [diff] [blame] | 106 | static int gpio_set_irq_type(struct irq_data *d, u32 type) |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 107 | { |
Lennert Buytenhek | 4d93579 | 2010-11-29 11:16:23 +0100 | [diff] [blame] | 108 | u32 gpio = irq_to_gpio(d->irq); |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame^] | 109 | struct mxc_gpio_port *port = irq_data_get_irq_chip_data(d); |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 110 | u32 bit, val; |
| 111 | int edge; |
| 112 | void __iomem *reg = port->base; |
| 113 | |
Guennadi Liakhovetski | 910862e | 2009-03-12 12:46:41 +0100 | [diff] [blame] | 114 | port->both_edges &= ~(1 << (gpio & 31)); |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 115 | switch (type) { |
Dmitry Baryshkov | 6cab486 | 2008-07-27 04:23:31 +0100 | [diff] [blame] | 116 | case IRQ_TYPE_EDGE_RISING: |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 117 | edge = GPIO_INT_RISE_EDGE; |
| 118 | break; |
Dmitry Baryshkov | 6cab486 | 2008-07-27 04:23:31 +0100 | [diff] [blame] | 119 | case IRQ_TYPE_EDGE_FALLING: |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 120 | edge = GPIO_INT_FALL_EDGE; |
| 121 | break; |
Guennadi Liakhovetski | 910862e | 2009-03-12 12:46:41 +0100 | [diff] [blame] | 122 | case IRQ_TYPE_EDGE_BOTH: |
| 123 | val = mxc_gpio_get(&port->chip, gpio & 31); |
| 124 | if (val) { |
| 125 | edge = GPIO_INT_LOW_LEV; |
| 126 | pr_debug("mxc: set GPIO %d to low trigger\n", gpio); |
| 127 | } else { |
| 128 | edge = GPIO_INT_HIGH_LEV; |
| 129 | pr_debug("mxc: set GPIO %d to high trigger\n", gpio); |
| 130 | } |
| 131 | port->both_edges |= 1 << (gpio & 31); |
| 132 | break; |
Dmitry Baryshkov | 6cab486 | 2008-07-27 04:23:31 +0100 | [diff] [blame] | 133 | case IRQ_TYPE_LEVEL_LOW: |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 134 | edge = GPIO_INT_LOW_LEV; |
| 135 | break; |
Dmitry Baryshkov | 6cab486 | 2008-07-27 04:23:31 +0100 | [diff] [blame] | 136 | case IRQ_TYPE_LEVEL_HIGH: |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 137 | edge = GPIO_INT_HIGH_LEV; |
| 138 | break; |
Guennadi Liakhovetski | 910862e | 2009-03-12 12:46:41 +0100 | [diff] [blame] | 139 | default: |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 140 | return -EINVAL; |
| 141 | } |
| 142 | |
| 143 | reg += GPIO_ICR1 + ((gpio & 0x10) >> 2); /* lower or upper register */ |
| 144 | bit = gpio & 0xf; |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame^] | 145 | val = readl(reg) & ~(0x3 << (bit << 1)); |
| 146 | writel(val | (edge << (bit << 1)), reg); |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 147 | _clear_gpio_irqstatus(port, gpio & 0x1f); |
| 148 | |
| 149 | return 0; |
| 150 | } |
| 151 | |
Guennadi Liakhovetski | 910862e | 2009-03-12 12:46:41 +0100 | [diff] [blame] | 152 | static void mxc_flip_edge(struct mxc_gpio_port *port, u32 gpio) |
| 153 | { |
| 154 | void __iomem *reg = port->base; |
| 155 | u32 bit, val; |
| 156 | int edge; |
| 157 | |
| 158 | reg += GPIO_ICR1 + ((gpio & 0x10) >> 2); /* lower or upper register */ |
| 159 | bit = gpio & 0xf; |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame^] | 160 | val = readl(reg); |
Guennadi Liakhovetski | 910862e | 2009-03-12 12:46:41 +0100 | [diff] [blame] | 161 | edge = (val >> (bit << 1)) & 3; |
| 162 | val &= ~(0x3 << (bit << 1)); |
Uwe Kleine-König | 3d40f7f | 2010-02-05 22:14:37 +0100 | [diff] [blame] | 163 | if (edge == GPIO_INT_HIGH_LEV) { |
Guennadi Liakhovetski | 910862e | 2009-03-12 12:46:41 +0100 | [diff] [blame] | 164 | edge = GPIO_INT_LOW_LEV; |
| 165 | pr_debug("mxc: switch GPIO %d to low trigger\n", gpio); |
Uwe Kleine-König | 3d40f7f | 2010-02-05 22:14:37 +0100 | [diff] [blame] | 166 | } else if (edge == GPIO_INT_LOW_LEV) { |
Guennadi Liakhovetski | 910862e | 2009-03-12 12:46:41 +0100 | [diff] [blame] | 167 | edge = GPIO_INT_HIGH_LEV; |
| 168 | pr_debug("mxc: switch GPIO %d to high trigger\n", gpio); |
Uwe Kleine-König | 3d40f7f | 2010-02-05 22:14:37 +0100 | [diff] [blame] | 169 | } else { |
Guennadi Liakhovetski | 910862e | 2009-03-12 12:46:41 +0100 | [diff] [blame] | 170 | pr_err("mxc: invalid configuration for GPIO %d: %x\n", |
| 171 | gpio, edge); |
| 172 | return; |
| 173 | } |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame^] | 174 | writel(val | (edge << (bit << 1)), reg); |
Guennadi Liakhovetski | 910862e | 2009-03-12 12:46:41 +0100 | [diff] [blame] | 175 | } |
| 176 | |
Uwe Kleine-König | 3621f18 | 2010-02-08 21:02:30 +0100 | [diff] [blame] | 177 | /* handle 32 interrupts in one status register */ |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 178 | static void mxc_gpio_irq_handler(struct mxc_gpio_port *port, u32 irq_stat) |
| 179 | { |
Uwe Kleine-König | 3621f18 | 2010-02-08 21:02:30 +0100 | [diff] [blame] | 180 | u32 gpio_irq_no_base = port->virtual_irq_start; |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 181 | |
Uwe Kleine-König | 3621f18 | 2010-02-08 21:02:30 +0100 | [diff] [blame] | 182 | while (irq_stat != 0) { |
| 183 | int irqoffset = fls(irq_stat) - 1; |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 184 | |
Uwe Kleine-König | 3621f18 | 2010-02-08 21:02:30 +0100 | [diff] [blame] | 185 | if (port->both_edges & (1 << irqoffset)) |
| 186 | mxc_flip_edge(port, irqoffset); |
Guennadi Liakhovetski | 910862e | 2009-03-12 12:46:41 +0100 | [diff] [blame] | 187 | |
Uwe Kleine-König | 3621f18 | 2010-02-08 21:02:30 +0100 | [diff] [blame] | 188 | generic_handle_irq(gpio_irq_no_base + irqoffset); |
Guennadi Liakhovetski | 910862e | 2009-03-12 12:46:41 +0100 | [diff] [blame] | 189 | |
Uwe Kleine-König | 3621f18 | 2010-02-08 21:02:30 +0100 | [diff] [blame] | 190 | irq_stat &= ~(1 << irqoffset); |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 191 | } |
| 192 | } |
| 193 | |
Paulius Zaleckas | cfca8b5 | 2008-11-14 11:01:38 +0100 | [diff] [blame] | 194 | /* MX1 and MX3 has one interrupt *per* gpio port */ |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 195 | static void mx3_gpio_irq_handler(u32 irq, struct irq_desc *desc) |
| 196 | { |
| 197 | u32 irq_stat; |
Thomas Gleixner | 6845664a | 2011-03-24 13:25:22 +0100 | [diff] [blame] | 198 | struct mxc_gpio_port *port = irq_get_handler_data(irq); |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 199 | |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame^] | 200 | irq_stat = readl(port->base + GPIO_ISR) & readl(port->base + GPIO_IMR); |
Sascha Hauer | e2c97e7 | 2009-04-21 12:39:59 +0200 | [diff] [blame] | 201 | |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 202 | mxc_gpio_irq_handler(port, irq_stat); |
| 203 | } |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 204 | |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 205 | /* MX2 has one interrupt *for all* gpio ports */ |
| 206 | static void mx2_gpio_irq_handler(u32 irq, struct irq_desc *desc) |
| 207 | { |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 208 | u32 irq_msk, irq_stat; |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame^] | 209 | struct mxc_gpio_port *port; |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 210 | |
| 211 | /* walk through all interrupt status registers */ |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame^] | 212 | list_for_each_entry(port, &mxc_gpio_ports, node) { |
| 213 | irq_msk = readl(port->base + GPIO_IMR); |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 214 | if (!irq_msk) |
| 215 | continue; |
| 216 | |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame^] | 217 | irq_stat = readl(port->base + GPIO_ISR) & irq_msk; |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 218 | if (irq_stat) |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame^] | 219 | mxc_gpio_irq_handler(port, irq_stat); |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 220 | } |
| 221 | } |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 222 | |
Dinh Nguyen | a3484ff | 2010-10-23 09:12:48 -0500 | [diff] [blame] | 223 | /* |
| 224 | * Set interrupt number "irq" in the GPIO as a wake-up source. |
| 225 | * While system is running, all registered GPIO interrupts need to have |
| 226 | * wake-up enabled. When system is suspended, only selected GPIO interrupts |
| 227 | * need to have wake-up enabled. |
| 228 | * @param irq interrupt source number |
| 229 | * @param enable enable as wake-up if equal to non-zero |
| 230 | * @return This function returns 0 on success. |
| 231 | */ |
Lennert Buytenhek | 4d93579 | 2010-11-29 11:16:23 +0100 | [diff] [blame] | 232 | static int gpio_set_wake_irq(struct irq_data *d, u32 enable) |
Dinh Nguyen | a3484ff | 2010-10-23 09:12:48 -0500 | [diff] [blame] | 233 | { |
Lennert Buytenhek | 4d93579 | 2010-11-29 11:16:23 +0100 | [diff] [blame] | 234 | u32 gpio = irq_to_gpio(d->irq); |
Dinh Nguyen | a3484ff | 2010-10-23 09:12:48 -0500 | [diff] [blame] | 235 | u32 gpio_idx = gpio & 0x1F; |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame^] | 236 | struct mxc_gpio_port *port = irq_data_get_irq_chip_data(d); |
Dinh Nguyen | a3484ff | 2010-10-23 09:12:48 -0500 | [diff] [blame] | 237 | |
| 238 | if (enable) { |
| 239 | if (port->irq_high && (gpio_idx >= 16)) |
| 240 | enable_irq_wake(port->irq_high); |
| 241 | else |
| 242 | enable_irq_wake(port->irq); |
| 243 | } else { |
| 244 | if (port->irq_high && (gpio_idx >= 16)) |
| 245 | disable_irq_wake(port->irq_high); |
| 246 | else |
| 247 | disable_irq_wake(port->irq); |
| 248 | } |
| 249 | |
| 250 | return 0; |
| 251 | } |
| 252 | |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 253 | static struct irq_chip gpio_irq_chip = { |
Alexander Stein | 039c464 | 2011-01-31 17:00:24 +0100 | [diff] [blame] | 254 | .name = "GPIO", |
Lennert Buytenhek | 4d93579 | 2010-11-29 11:16:23 +0100 | [diff] [blame] | 255 | .irq_ack = gpio_ack_irq, |
| 256 | .irq_mask = gpio_mask_irq, |
| 257 | .irq_unmask = gpio_unmask_irq, |
| 258 | .irq_set_type = gpio_set_irq_type, |
| 259 | .irq_set_wake = gpio_set_wake_irq, |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 260 | }; |
| 261 | |
| 262 | static void _set_gpio_direction(struct gpio_chip *chip, unsigned offset, |
| 263 | int dir) |
| 264 | { |
| 265 | struct mxc_gpio_port *port = |
| 266 | container_of(chip, struct mxc_gpio_port, chip); |
| 267 | u32 l; |
Baruch Siach | 14cb0de | 2010-07-06 14:03:22 +0300 | [diff] [blame] | 268 | unsigned long flags; |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 269 | |
Baruch Siach | 14cb0de | 2010-07-06 14:03:22 +0300 | [diff] [blame] | 270 | spin_lock_irqsave(&port->lock, flags); |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame^] | 271 | l = readl(port->base + GPIO_GDIR); |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 272 | if (dir) |
| 273 | l |= 1 << offset; |
| 274 | else |
| 275 | l &= ~(1 << offset); |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame^] | 276 | writel(l, port->base + GPIO_GDIR); |
Baruch Siach | 14cb0de | 2010-07-06 14:03:22 +0300 | [diff] [blame] | 277 | spin_unlock_irqrestore(&port->lock, flags); |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 278 | } |
| 279 | |
| 280 | static void mxc_gpio_set(struct gpio_chip *chip, unsigned offset, int value) |
| 281 | { |
| 282 | struct mxc_gpio_port *port = |
| 283 | container_of(chip, struct mxc_gpio_port, chip); |
| 284 | void __iomem *reg = port->base + GPIO_DR; |
| 285 | u32 l; |
Baruch Siach | 14cb0de | 2010-07-06 14:03:22 +0300 | [diff] [blame] | 286 | unsigned long flags; |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 287 | |
Baruch Siach | 14cb0de | 2010-07-06 14:03:22 +0300 | [diff] [blame] | 288 | spin_lock_irqsave(&port->lock, flags); |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame^] | 289 | l = (readl(reg) & (~(1 << offset))) | (!!value << offset); |
| 290 | writel(l, reg); |
Baruch Siach | 14cb0de | 2010-07-06 14:03:22 +0300 | [diff] [blame] | 291 | spin_unlock_irqrestore(&port->lock, flags); |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 292 | } |
| 293 | |
| 294 | static int mxc_gpio_get(struct gpio_chip *chip, unsigned offset) |
| 295 | { |
| 296 | struct mxc_gpio_port *port = |
| 297 | container_of(chip, struct mxc_gpio_port, chip); |
| 298 | |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame^] | 299 | return (readl(port->base + GPIO_PSR) >> offset) & 1; |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 300 | } |
| 301 | |
| 302 | static int mxc_gpio_direction_input(struct gpio_chip *chip, unsigned offset) |
| 303 | { |
| 304 | _set_gpio_direction(chip, offset, 0); |
| 305 | return 0; |
| 306 | } |
| 307 | |
| 308 | static int mxc_gpio_direction_output(struct gpio_chip *chip, |
| 309 | unsigned offset, int value) |
| 310 | { |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 311 | mxc_gpio_set(chip, offset, value); |
Guennadi Liakhovetski | 999981d | 2009-02-12 14:27:22 +0100 | [diff] [blame] | 312 | _set_gpio_direction(chip, offset, 1); |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 313 | return 0; |
| 314 | } |
| 315 | |
Thomas Gleixner | b5eee2f | 2011-04-04 14:29:58 +0200 | [diff] [blame] | 316 | /* |
| 317 | * This lock class tells lockdep that GPIO irqs are in a different |
| 318 | * category than their parents, so it won't report false recursion. |
| 319 | */ |
| 320 | static struct lock_class_key gpio_lock_class; |
| 321 | |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame^] | 322 | static int __devinit mxc_gpio_probe(struct platform_device *pdev) |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 323 | { |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame^] | 324 | struct mxc_gpio_port *port; |
| 325 | struct resource *iores; |
| 326 | int err, i; |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 327 | |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame^] | 328 | port = kzalloc(sizeof(struct mxc_gpio_port), GFP_KERNEL); |
| 329 | if (!port) |
| 330 | return -ENOMEM; |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 331 | |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame^] | 332 | port->virtual_irq_start = MXC_GPIO_IRQ_START + pdev->id * 32; |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 333 | |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame^] | 334 | iores = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 335 | if (!iores) { |
| 336 | err = -ENODEV; |
| 337 | goto out_kfree; |
| 338 | } |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 339 | |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame^] | 340 | if (!request_mem_region(iores->start, resource_size(iores), |
| 341 | pdev->name)) { |
| 342 | err = -EBUSY; |
| 343 | goto out_kfree; |
| 344 | } |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 345 | |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame^] | 346 | port->base = ioremap(iores->start, resource_size(iores)); |
| 347 | if (!port->base) { |
| 348 | err = -ENOMEM; |
| 349 | goto out_release_mem; |
| 350 | } |
Baruch Siach | 14cb0de | 2010-07-06 14:03:22 +0300 | [diff] [blame] | 351 | |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame^] | 352 | port->irq_high = platform_get_irq(pdev, 1); |
| 353 | port->irq = platform_get_irq(pdev, 0); |
| 354 | if (port->irq < 0) { |
| 355 | err = -EINVAL; |
| 356 | goto out_iounmap; |
| 357 | } |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 358 | |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame^] | 359 | /* disable the interrupt and clear the status */ |
| 360 | writel(0, port->base + GPIO_IMR); |
| 361 | writel(~0, port->base + GPIO_ISR); |
| 362 | |
| 363 | for (i = port->virtual_irq_start; |
| 364 | i < port->virtual_irq_start + 32; i++) { |
| 365 | irq_set_lockdep_class(i, &gpio_lock_class); |
| 366 | irq_set_chip_and_handler(i, &gpio_irq_chip, handle_level_irq); |
| 367 | set_irq_flags(i, IRQF_VALID); |
| 368 | irq_set_chip_data(i, port); |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 369 | } |
| 370 | |
Sascha Hauer | 8afaada | 2009-06-15 12:36:25 +0200 | [diff] [blame] | 371 | if (cpu_is_mx2()) { |
| 372 | /* setup one handler for all GPIO interrupts */ |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame^] | 373 | if (pdev->id == 0) |
| 374 | irq_set_chained_handler(port->irq, |
| 375 | mx2_gpio_irq_handler); |
| 376 | } else { |
| 377 | /* setup one handler for each entry */ |
| 378 | irq_set_chained_handler(port->irq, mx3_gpio_irq_handler); |
| 379 | irq_set_handler_data(port->irq, port); |
| 380 | if (port->irq_high > 0) { |
| 381 | /* setup handler for GPIO 16 to 31 */ |
| 382 | irq_set_chained_handler(port->irq_high, |
| 383 | mx3_gpio_irq_handler); |
| 384 | irq_set_handler_data(port->irq_high, port); |
| 385 | } |
Sascha Hauer | 8afaada | 2009-06-15 12:36:25 +0200 | [diff] [blame] | 386 | } |
| 387 | |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame^] | 388 | /* register gpio chip */ |
| 389 | port->chip.direction_input = mxc_gpio_direction_input; |
| 390 | port->chip.direction_output = mxc_gpio_direction_output; |
| 391 | port->chip.get = mxc_gpio_get; |
| 392 | port->chip.set = mxc_gpio_set; |
| 393 | port->chip.base = pdev->id * 32; |
| 394 | port->chip.ngpio = 32; |
| 395 | |
| 396 | spin_lock_init(&port->lock); |
| 397 | |
| 398 | err = gpiochip_add(&port->chip); |
| 399 | if (err) |
| 400 | goto out_iounmap; |
| 401 | |
| 402 | list_add_tail(&port->node, &mxc_gpio_ports); |
| 403 | |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 404 | return 0; |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame^] | 405 | |
| 406 | out_iounmap: |
| 407 | iounmap(port->base); |
| 408 | out_release_mem: |
| 409 | release_mem_region(iores->start, resource_size(iores)); |
| 410 | out_kfree: |
| 411 | kfree(port); |
| 412 | dev_info(&pdev->dev, "%s failed with errno %d\n", __func__, err); |
| 413 | return err; |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 414 | } |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame^] | 415 | |
| 416 | static struct platform_driver mxc_gpio_driver = { |
| 417 | .driver = { |
| 418 | .name = "gpio-mxc", |
| 419 | .owner = THIS_MODULE, |
| 420 | }, |
| 421 | .probe = mxc_gpio_probe, |
| 422 | }; |
| 423 | |
| 424 | static int __init gpio_mxc_init(void) |
| 425 | { |
| 426 | return platform_driver_register(&mxc_gpio_driver); |
| 427 | } |
| 428 | postcore_initcall(gpio_mxc_init); |
| 429 | |
| 430 | MODULE_AUTHOR("Freescale Semiconductor, " |
| 431 | "Daniel Mack <danielncaiaq.de>, " |
| 432 | "Juergen Beisert <kernel@pengutronix.de>"); |
| 433 | MODULE_DESCRIPTION("Freescale MXC GPIO"); |
| 434 | MODULE_LICENSE("GPL"); |