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 | * |
Paul Gortmaker | 2c8d6c8 | 2016-08-22 12:48:31 -0400 | [diff] [blame] | 5 | * Based on code from Freescale Semiconductor, |
| 6 | * Authors: Daniel Mack, Juergen Beisert. |
Dinh Nguyen | e24798e | 2010-04-22 16:28:42 +0300 | [diff] [blame] | 7 | * Copyright (C) 2004-2010 Freescale Semiconductor, Inc. All Rights Reserved. |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 8 | * |
| 9 | * This program is free software; you can redistribute it and/or |
| 10 | * modify it under the terms of the GNU General Public License |
| 11 | * as published by the Free Software Foundation; either version 2 |
| 12 | * of the License, or (at your option) any later version. |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License |
| 19 | * along with this program; if not, write to the Free Software |
| 20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 21 | */ |
| 22 | |
Fabio Estevam | 18f92b1 | 2013-07-22 18:17:52 -0300 | [diff] [blame] | 23 | #include <linux/err.h> |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 24 | #include <linux/init.h> |
Dinh Nguyen | a3484ff | 2010-10-23 09:12:48 -0500 | [diff] [blame] | 25 | #include <linux/interrupt.h> |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 26 | #include <linux/io.h> |
| 27 | #include <linux/irq.h> |
Shawn Guo | 1ab7ef1 | 2012-06-13 09:04:03 +0800 | [diff] [blame] | 28 | #include <linux/irqdomain.h> |
Catalin Marinas | de88cbb | 2013-01-18 15:31:37 +0000 | [diff] [blame] | 29 | #include <linux/irqchip/chained_irq.h> |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame] | 30 | #include <linux/platform_device.h> |
| 31 | #include <linux/slab.h> |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 32 | #include <linux/gpio/driver.h> |
| 33 | /* FIXME: for gpio_get_value() replace this with direct register read */ |
| 34 | #include <linux/gpio.h> |
Shawn Guo | 8937cb6 | 2011-07-07 00:37:43 +0800 | [diff] [blame] | 35 | #include <linux/of.h> |
| 36 | #include <linux/of_device.h> |
Christoph Hellwig | 16c3bd3 | 2015-08-28 09:27:22 +0200 | [diff] [blame] | 37 | #include <linux/bug.h> |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 38 | |
Shawn Guo | e7fc6ae | 2011-07-07 00:37:41 +0800 | [diff] [blame] | 39 | enum mxc_gpio_hwtype { |
| 40 | IMX1_GPIO, /* runs on i.mx1 */ |
| 41 | IMX21_GPIO, /* runs on i.mx21 and i.mx27 */ |
Benoît Thébaudeau | aeb2774 | 2012-06-22 21:04:06 +0200 | [diff] [blame] | 42 | IMX31_GPIO, /* runs on i.mx31 */ |
| 43 | IMX35_GPIO, /* runs on all other i.mx */ |
Shawn Guo | e7fc6ae | 2011-07-07 00:37:41 +0800 | [diff] [blame] | 44 | }; |
| 45 | |
| 46 | /* device type dependent stuff */ |
| 47 | struct mxc_gpio_hwdata { |
| 48 | unsigned dr_reg; |
| 49 | unsigned gdir_reg; |
| 50 | unsigned psr_reg; |
| 51 | unsigned icr1_reg; |
| 52 | unsigned icr2_reg; |
| 53 | unsigned imr_reg; |
| 54 | unsigned isr_reg; |
Benoît Thébaudeau | aeb2774 | 2012-06-22 21:04:06 +0200 | [diff] [blame] | 55 | int edge_sel_reg; |
Shawn Guo | e7fc6ae | 2011-07-07 00:37:41 +0800 | [diff] [blame] | 56 | unsigned low_level; |
| 57 | unsigned high_level; |
| 58 | unsigned rise_edge; |
| 59 | unsigned fall_edge; |
| 60 | }; |
| 61 | |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame] | 62 | struct mxc_gpio_port { |
| 63 | struct list_head node; |
| 64 | void __iomem *base; |
| 65 | int irq; |
| 66 | int irq_high; |
Shawn Guo | 1ab7ef1 | 2012-06-13 09:04:03 +0800 | [diff] [blame] | 67 | struct irq_domain *domain; |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 68 | struct gpio_chip gc; |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame] | 69 | u32 both_edges; |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame] | 70 | }; |
| 71 | |
Shawn Guo | e7fc6ae | 2011-07-07 00:37:41 +0800 | [diff] [blame] | 72 | static struct mxc_gpio_hwdata imx1_imx21_gpio_hwdata = { |
| 73 | .dr_reg = 0x1c, |
| 74 | .gdir_reg = 0x00, |
| 75 | .psr_reg = 0x24, |
| 76 | .icr1_reg = 0x28, |
| 77 | .icr2_reg = 0x2c, |
| 78 | .imr_reg = 0x30, |
| 79 | .isr_reg = 0x34, |
Benoît Thébaudeau | aeb2774 | 2012-06-22 21:04:06 +0200 | [diff] [blame] | 80 | .edge_sel_reg = -EINVAL, |
Shawn Guo | e7fc6ae | 2011-07-07 00:37:41 +0800 | [diff] [blame] | 81 | .low_level = 0x03, |
| 82 | .high_level = 0x02, |
| 83 | .rise_edge = 0x00, |
| 84 | .fall_edge = 0x01, |
| 85 | }; |
| 86 | |
| 87 | static struct mxc_gpio_hwdata imx31_gpio_hwdata = { |
| 88 | .dr_reg = 0x00, |
| 89 | .gdir_reg = 0x04, |
| 90 | .psr_reg = 0x08, |
| 91 | .icr1_reg = 0x0c, |
| 92 | .icr2_reg = 0x10, |
| 93 | .imr_reg = 0x14, |
| 94 | .isr_reg = 0x18, |
Benoît Thébaudeau | aeb2774 | 2012-06-22 21:04:06 +0200 | [diff] [blame] | 95 | .edge_sel_reg = -EINVAL, |
| 96 | .low_level = 0x00, |
| 97 | .high_level = 0x01, |
| 98 | .rise_edge = 0x02, |
| 99 | .fall_edge = 0x03, |
| 100 | }; |
| 101 | |
| 102 | static struct mxc_gpio_hwdata imx35_gpio_hwdata = { |
| 103 | .dr_reg = 0x00, |
| 104 | .gdir_reg = 0x04, |
| 105 | .psr_reg = 0x08, |
| 106 | .icr1_reg = 0x0c, |
| 107 | .icr2_reg = 0x10, |
| 108 | .imr_reg = 0x14, |
| 109 | .isr_reg = 0x18, |
| 110 | .edge_sel_reg = 0x1c, |
Shawn Guo | e7fc6ae | 2011-07-07 00:37:41 +0800 | [diff] [blame] | 111 | .low_level = 0x00, |
| 112 | .high_level = 0x01, |
| 113 | .rise_edge = 0x02, |
| 114 | .fall_edge = 0x03, |
| 115 | }; |
| 116 | |
| 117 | static enum mxc_gpio_hwtype mxc_gpio_hwtype; |
| 118 | static struct mxc_gpio_hwdata *mxc_gpio_hwdata; |
| 119 | |
| 120 | #define GPIO_DR (mxc_gpio_hwdata->dr_reg) |
| 121 | #define GPIO_GDIR (mxc_gpio_hwdata->gdir_reg) |
| 122 | #define GPIO_PSR (mxc_gpio_hwdata->psr_reg) |
| 123 | #define GPIO_ICR1 (mxc_gpio_hwdata->icr1_reg) |
| 124 | #define GPIO_ICR2 (mxc_gpio_hwdata->icr2_reg) |
| 125 | #define GPIO_IMR (mxc_gpio_hwdata->imr_reg) |
| 126 | #define GPIO_ISR (mxc_gpio_hwdata->isr_reg) |
Benoît Thébaudeau | aeb2774 | 2012-06-22 21:04:06 +0200 | [diff] [blame] | 127 | #define GPIO_EDGE_SEL (mxc_gpio_hwdata->edge_sel_reg) |
Shawn Guo | e7fc6ae | 2011-07-07 00:37:41 +0800 | [diff] [blame] | 128 | |
| 129 | #define GPIO_INT_LOW_LEV (mxc_gpio_hwdata->low_level) |
| 130 | #define GPIO_INT_HIGH_LEV (mxc_gpio_hwdata->high_level) |
| 131 | #define GPIO_INT_RISE_EDGE (mxc_gpio_hwdata->rise_edge) |
| 132 | #define GPIO_INT_FALL_EDGE (mxc_gpio_hwdata->fall_edge) |
Benoît Thébaudeau | aeb2774 | 2012-06-22 21:04:06 +0200 | [diff] [blame] | 133 | #define GPIO_INT_BOTH_EDGES 0x4 |
Shawn Guo | e7fc6ae | 2011-07-07 00:37:41 +0800 | [diff] [blame] | 134 | |
Krzysztof Kozlowski | f4f79d4 | 2015-05-02 00:56:47 +0900 | [diff] [blame] | 135 | static const struct platform_device_id mxc_gpio_devtype[] = { |
Shawn Guo | e7fc6ae | 2011-07-07 00:37:41 +0800 | [diff] [blame] | 136 | { |
| 137 | .name = "imx1-gpio", |
| 138 | .driver_data = IMX1_GPIO, |
| 139 | }, { |
| 140 | .name = "imx21-gpio", |
| 141 | .driver_data = IMX21_GPIO, |
| 142 | }, { |
| 143 | .name = "imx31-gpio", |
| 144 | .driver_data = IMX31_GPIO, |
| 145 | }, { |
Benoît Thébaudeau | aeb2774 | 2012-06-22 21:04:06 +0200 | [diff] [blame] | 146 | .name = "imx35-gpio", |
| 147 | .driver_data = IMX35_GPIO, |
| 148 | }, { |
Shawn Guo | e7fc6ae | 2011-07-07 00:37:41 +0800 | [diff] [blame] | 149 | /* sentinel */ |
| 150 | } |
| 151 | }; |
| 152 | |
Shawn Guo | 8937cb6 | 2011-07-07 00:37:43 +0800 | [diff] [blame] | 153 | static const struct of_device_id mxc_gpio_dt_ids[] = { |
| 154 | { .compatible = "fsl,imx1-gpio", .data = &mxc_gpio_devtype[IMX1_GPIO], }, |
| 155 | { .compatible = "fsl,imx21-gpio", .data = &mxc_gpio_devtype[IMX21_GPIO], }, |
| 156 | { .compatible = "fsl,imx31-gpio", .data = &mxc_gpio_devtype[IMX31_GPIO], }, |
Benoît Thébaudeau | aeb2774 | 2012-06-22 21:04:06 +0200 | [diff] [blame] | 157 | { .compatible = "fsl,imx35-gpio", .data = &mxc_gpio_devtype[IMX35_GPIO], }, |
Shawn Guo | 8937cb6 | 2011-07-07 00:37:43 +0800 | [diff] [blame] | 158 | { /* sentinel */ } |
| 159 | }; |
| 160 | |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame] | 161 | /* |
| 162 | * MX2 has one interrupt *for all* gpio ports. The list is used |
| 163 | * to save the references to all ports, so that mx2_gpio_irq_handler |
| 164 | * can walk through all interrupt status registers. |
| 165 | */ |
| 166 | static LIST_HEAD(mxc_gpio_ports); |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 167 | |
| 168 | /* Note: This driver assumes 32 GPIOs are handled in one register */ |
| 169 | |
Lennert Buytenhek | 4d93579 | 2010-11-29 11:16:23 +0100 | [diff] [blame] | 170 | static int gpio_set_irq_type(struct irq_data *d, u32 type) |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 171 | { |
Shawn Guo | e4ea933 | 2011-06-07 16:25:37 +0800 | [diff] [blame] | 172 | struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); |
| 173 | struct mxc_gpio_port *port = gc->private; |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 174 | u32 bit, val; |
Shawn Guo | 1ab7ef1 | 2012-06-13 09:04:03 +0800 | [diff] [blame] | 175 | u32 gpio_idx = d->hwirq; |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 176 | u32 gpio = port->gc.base + gpio_idx; |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 177 | int edge; |
| 178 | void __iomem *reg = port->base; |
| 179 | |
Shawn Guo | 1ab7ef1 | 2012-06-13 09:04:03 +0800 | [diff] [blame] | 180 | port->both_edges &= ~(1 << gpio_idx); |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 181 | switch (type) { |
Dmitry Baryshkov | 6cab486 | 2008-07-27 04:23:31 +0100 | [diff] [blame] | 182 | case IRQ_TYPE_EDGE_RISING: |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 183 | edge = GPIO_INT_RISE_EDGE; |
| 184 | break; |
Dmitry Baryshkov | 6cab486 | 2008-07-27 04:23:31 +0100 | [diff] [blame] | 185 | case IRQ_TYPE_EDGE_FALLING: |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 186 | edge = GPIO_INT_FALL_EDGE; |
| 187 | break; |
Guennadi Liakhovetski | 910862e | 2009-03-12 12:46:41 +0100 | [diff] [blame] | 188 | case IRQ_TYPE_EDGE_BOTH: |
Benoît Thébaudeau | aeb2774 | 2012-06-22 21:04:06 +0200 | [diff] [blame] | 189 | if (GPIO_EDGE_SEL >= 0) { |
| 190 | edge = GPIO_INT_BOTH_EDGES; |
Guennadi Liakhovetski | 910862e | 2009-03-12 12:46:41 +0100 | [diff] [blame] | 191 | } else { |
Benoît Thébaudeau | aeb2774 | 2012-06-22 21:04:06 +0200 | [diff] [blame] | 192 | val = gpio_get_value(gpio); |
| 193 | if (val) { |
| 194 | edge = GPIO_INT_LOW_LEV; |
| 195 | pr_debug("mxc: set GPIO %d to low trigger\n", gpio); |
| 196 | } else { |
| 197 | edge = GPIO_INT_HIGH_LEV; |
| 198 | pr_debug("mxc: set GPIO %d to high trigger\n", gpio); |
| 199 | } |
Linus Torvalds | f948ad0 | 2012-07-26 13:56:38 -0700 | [diff] [blame] | 200 | port->both_edges |= 1 << gpio_idx; |
Guennadi Liakhovetski | 910862e | 2009-03-12 12:46:41 +0100 | [diff] [blame] | 201 | } |
Guennadi Liakhovetski | 910862e | 2009-03-12 12:46:41 +0100 | [diff] [blame] | 202 | break; |
Dmitry Baryshkov | 6cab486 | 2008-07-27 04:23:31 +0100 | [diff] [blame] | 203 | case IRQ_TYPE_LEVEL_LOW: |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 204 | edge = GPIO_INT_LOW_LEV; |
| 205 | break; |
Dmitry Baryshkov | 6cab486 | 2008-07-27 04:23:31 +0100 | [diff] [blame] | 206 | case IRQ_TYPE_LEVEL_HIGH: |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 207 | edge = GPIO_INT_HIGH_LEV; |
| 208 | break; |
Guennadi Liakhovetski | 910862e | 2009-03-12 12:46:41 +0100 | [diff] [blame] | 209 | default: |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 210 | return -EINVAL; |
| 211 | } |
| 212 | |
Benoît Thébaudeau | aeb2774 | 2012-06-22 21:04:06 +0200 | [diff] [blame] | 213 | if (GPIO_EDGE_SEL >= 0) { |
| 214 | val = readl(port->base + GPIO_EDGE_SEL); |
| 215 | if (edge == GPIO_INT_BOTH_EDGES) |
Linus Torvalds | f948ad0 | 2012-07-26 13:56:38 -0700 | [diff] [blame] | 216 | writel(val | (1 << gpio_idx), |
Benoît Thébaudeau | aeb2774 | 2012-06-22 21:04:06 +0200 | [diff] [blame] | 217 | port->base + GPIO_EDGE_SEL); |
| 218 | else |
Linus Torvalds | f948ad0 | 2012-07-26 13:56:38 -0700 | [diff] [blame] | 219 | writel(val & ~(1 << gpio_idx), |
Benoît Thébaudeau | aeb2774 | 2012-06-22 21:04:06 +0200 | [diff] [blame] | 220 | port->base + GPIO_EDGE_SEL); |
| 221 | } |
| 222 | |
| 223 | if (edge != GPIO_INT_BOTH_EDGES) { |
Linus Torvalds | f948ad0 | 2012-07-26 13:56:38 -0700 | [diff] [blame] | 224 | reg += GPIO_ICR1 + ((gpio_idx & 0x10) >> 2); /* lower or upper register */ |
| 225 | bit = gpio_idx & 0xf; |
Benoît Thébaudeau | aeb2774 | 2012-06-22 21:04:06 +0200 | [diff] [blame] | 226 | val = readl(reg) & ~(0x3 << (bit << 1)); |
| 227 | writel(val | (edge << (bit << 1)), reg); |
| 228 | } |
| 229 | |
Shawn Guo | 1ab7ef1 | 2012-06-13 09:04:03 +0800 | [diff] [blame] | 230 | writel(1 << gpio_idx, port->base + GPIO_ISR); |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 231 | |
| 232 | return 0; |
| 233 | } |
| 234 | |
Guennadi Liakhovetski | 910862e | 2009-03-12 12:46:41 +0100 | [diff] [blame] | 235 | static void mxc_flip_edge(struct mxc_gpio_port *port, u32 gpio) |
| 236 | { |
| 237 | void __iomem *reg = port->base; |
| 238 | u32 bit, val; |
| 239 | int edge; |
| 240 | |
| 241 | reg += GPIO_ICR1 + ((gpio & 0x10) >> 2); /* lower or upper register */ |
| 242 | bit = gpio & 0xf; |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame] | 243 | val = readl(reg); |
Guennadi Liakhovetski | 910862e | 2009-03-12 12:46:41 +0100 | [diff] [blame] | 244 | edge = (val >> (bit << 1)) & 3; |
| 245 | val &= ~(0x3 << (bit << 1)); |
Uwe Kleine-König | 3d40f7f | 2010-02-05 22:14:37 +0100 | [diff] [blame] | 246 | if (edge == GPIO_INT_HIGH_LEV) { |
Guennadi Liakhovetski | 910862e | 2009-03-12 12:46:41 +0100 | [diff] [blame] | 247 | edge = GPIO_INT_LOW_LEV; |
| 248 | pr_debug("mxc: switch GPIO %d to low trigger\n", gpio); |
Uwe Kleine-König | 3d40f7f | 2010-02-05 22:14:37 +0100 | [diff] [blame] | 249 | } else if (edge == GPIO_INT_LOW_LEV) { |
Guennadi Liakhovetski | 910862e | 2009-03-12 12:46:41 +0100 | [diff] [blame] | 250 | edge = GPIO_INT_HIGH_LEV; |
| 251 | pr_debug("mxc: switch GPIO %d to high trigger\n", gpio); |
Uwe Kleine-König | 3d40f7f | 2010-02-05 22:14:37 +0100 | [diff] [blame] | 252 | } else { |
Guennadi Liakhovetski | 910862e | 2009-03-12 12:46:41 +0100 | [diff] [blame] | 253 | pr_err("mxc: invalid configuration for GPIO %d: %x\n", |
| 254 | gpio, edge); |
| 255 | return; |
| 256 | } |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame] | 257 | writel(val | (edge << (bit << 1)), reg); |
Guennadi Liakhovetski | 910862e | 2009-03-12 12:46:41 +0100 | [diff] [blame] | 258 | } |
| 259 | |
Uwe Kleine-König | 3621f18 | 2010-02-08 21:02:30 +0100 | [diff] [blame] | 260 | /* handle 32 interrupts in one status register */ |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 261 | static void mxc_gpio_irq_handler(struct mxc_gpio_port *port, u32 irq_stat) |
| 262 | { |
Uwe Kleine-König | 3621f18 | 2010-02-08 21:02:30 +0100 | [diff] [blame] | 263 | while (irq_stat != 0) { |
| 264 | int irqoffset = fls(irq_stat) - 1; |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 265 | |
Uwe Kleine-König | 3621f18 | 2010-02-08 21:02:30 +0100 | [diff] [blame] | 266 | if (port->both_edges & (1 << irqoffset)) |
| 267 | mxc_flip_edge(port, irqoffset); |
Guennadi Liakhovetski | 910862e | 2009-03-12 12:46:41 +0100 | [diff] [blame] | 268 | |
Shawn Guo | 1ab7ef1 | 2012-06-13 09:04:03 +0800 | [diff] [blame] | 269 | generic_handle_irq(irq_find_mapping(port->domain, irqoffset)); |
Guennadi Liakhovetski | 910862e | 2009-03-12 12:46:41 +0100 | [diff] [blame] | 270 | |
Uwe Kleine-König | 3621f18 | 2010-02-08 21:02:30 +0100 | [diff] [blame] | 271 | irq_stat &= ~(1 << irqoffset); |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 272 | } |
| 273 | } |
| 274 | |
Paulius Zaleckas | cfca8b5 | 2008-11-14 11:01:38 +0100 | [diff] [blame] | 275 | /* MX1 and MX3 has one interrupt *per* gpio port */ |
Thomas Gleixner | bd0b9ac | 2015-09-14 10:42:37 +0200 | [diff] [blame] | 276 | static void mx3_gpio_irq_handler(struct irq_desc *desc) |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 277 | { |
| 278 | u32 irq_stat; |
Jiang Liu | 476f8b4 | 2015-06-04 12:13:15 +0800 | [diff] [blame] | 279 | struct mxc_gpio_port *port = irq_desc_get_handler_data(desc); |
| 280 | struct irq_chip *chip = irq_desc_get_chip(desc); |
Shawn Guo | 0e44b6e | 2011-09-21 21:24:04 +0800 | [diff] [blame] | 281 | |
| 282 | chained_irq_enter(chip, desc); |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 283 | |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame] | 284 | irq_stat = readl(port->base + GPIO_ISR) & readl(port->base + GPIO_IMR); |
Sascha Hauer | e2c97e7 | 2009-04-21 12:39:59 +0200 | [diff] [blame] | 285 | |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 286 | mxc_gpio_irq_handler(port, irq_stat); |
Shawn Guo | 0e44b6e | 2011-09-21 21:24:04 +0800 | [diff] [blame] | 287 | |
| 288 | chained_irq_exit(chip, desc); |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 289 | } |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 290 | |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 291 | /* MX2 has one interrupt *for all* gpio ports */ |
Thomas Gleixner | bd0b9ac | 2015-09-14 10:42:37 +0200 | [diff] [blame] | 292 | static void mx2_gpio_irq_handler(struct irq_desc *desc) |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 293 | { |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 294 | u32 irq_msk, irq_stat; |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame] | 295 | struct mxc_gpio_port *port; |
Jiang Liu | 476f8b4 | 2015-06-04 12:13:15 +0800 | [diff] [blame] | 296 | struct irq_chip *chip = irq_desc_get_chip(desc); |
Uwe Kleine-König | c0e811d | 2013-07-18 14:58:06 +0200 | [diff] [blame] | 297 | |
| 298 | chained_irq_enter(chip, desc); |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 299 | |
| 300 | /* walk through all interrupt status registers */ |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame] | 301 | list_for_each_entry(port, &mxc_gpio_ports, node) { |
| 302 | irq_msk = readl(port->base + GPIO_IMR); |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 303 | if (!irq_msk) |
| 304 | continue; |
| 305 | |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame] | 306 | irq_stat = readl(port->base + GPIO_ISR) & irq_msk; |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 307 | if (irq_stat) |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame] | 308 | mxc_gpio_irq_handler(port, irq_stat); |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 309 | } |
Uwe Kleine-König | c0e811d | 2013-07-18 14:58:06 +0200 | [diff] [blame] | 310 | chained_irq_exit(chip, desc); |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 311 | } |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 312 | |
Dinh Nguyen | a3484ff | 2010-10-23 09:12:48 -0500 | [diff] [blame] | 313 | /* |
| 314 | * Set interrupt number "irq" in the GPIO as a wake-up source. |
| 315 | * While system is running, all registered GPIO interrupts need to have |
| 316 | * wake-up enabled. When system is suspended, only selected GPIO interrupts |
| 317 | * need to have wake-up enabled. |
| 318 | * @param irq interrupt source number |
| 319 | * @param enable enable as wake-up if equal to non-zero |
| 320 | * @return This function returns 0 on success. |
| 321 | */ |
Lennert Buytenhek | 4d93579 | 2010-11-29 11:16:23 +0100 | [diff] [blame] | 322 | static int gpio_set_wake_irq(struct irq_data *d, u32 enable) |
Dinh Nguyen | a3484ff | 2010-10-23 09:12:48 -0500 | [diff] [blame] | 323 | { |
Shawn Guo | e4ea933 | 2011-06-07 16:25:37 +0800 | [diff] [blame] | 324 | struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); |
| 325 | struct mxc_gpio_port *port = gc->private; |
Shawn Guo | 1ab7ef1 | 2012-06-13 09:04:03 +0800 | [diff] [blame] | 326 | u32 gpio_idx = d->hwirq; |
Dinh Nguyen | a3484ff | 2010-10-23 09:12:48 -0500 | [diff] [blame] | 327 | |
| 328 | if (enable) { |
| 329 | if (port->irq_high && (gpio_idx >= 16)) |
| 330 | enable_irq_wake(port->irq_high); |
| 331 | else |
| 332 | enable_irq_wake(port->irq); |
| 333 | } else { |
| 334 | if (port->irq_high && (gpio_idx >= 16)) |
| 335 | disable_irq_wake(port->irq_high); |
| 336 | else |
| 337 | disable_irq_wake(port->irq); |
| 338 | } |
| 339 | |
| 340 | return 0; |
| 341 | } |
| 342 | |
Peng Fan | 9e26b0b | 2015-08-23 21:11:52 +0800 | [diff] [blame] | 343 | static int mxc_gpio_init_gc(struct mxc_gpio_port *port, int irq_base) |
Shawn Guo | e4ea933 | 2011-06-07 16:25:37 +0800 | [diff] [blame] | 344 | { |
| 345 | struct irq_chip_generic *gc; |
| 346 | struct irq_chip_type *ct; |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 347 | |
Shawn Guo | 1ab7ef1 | 2012-06-13 09:04:03 +0800 | [diff] [blame] | 348 | gc = irq_alloc_generic_chip("gpio-mxc", 1, irq_base, |
Shawn Guo | e4ea933 | 2011-06-07 16:25:37 +0800 | [diff] [blame] | 349 | port->base, handle_level_irq); |
Peng Fan | 9e26b0b | 2015-08-23 21:11:52 +0800 | [diff] [blame] | 350 | if (!gc) |
| 351 | return -ENOMEM; |
Shawn Guo | e4ea933 | 2011-06-07 16:25:37 +0800 | [diff] [blame] | 352 | gc->private = port; |
| 353 | |
| 354 | ct = gc->chip_types; |
Shawn Guo | 591567a | 2011-07-19 21:16:56 +0800 | [diff] [blame] | 355 | ct->chip.irq_ack = irq_gc_ack_set_bit; |
Shawn Guo | e4ea933 | 2011-06-07 16:25:37 +0800 | [diff] [blame] | 356 | ct->chip.irq_mask = irq_gc_mask_clr_bit; |
| 357 | ct->chip.irq_unmask = irq_gc_mask_set_bit; |
| 358 | ct->chip.irq_set_type = gpio_set_irq_type; |
Shawn Guo | 591567a | 2011-07-19 21:16:56 +0800 | [diff] [blame] | 359 | ct->chip.irq_set_wake = gpio_set_wake_irq; |
Ulises Brindis | 952cfbd | 2015-08-05 10:23:07 -0700 | [diff] [blame] | 360 | ct->chip.flags = IRQCHIP_MASK_ON_SUSPEND; |
Shawn Guo | e4ea933 | 2011-06-07 16:25:37 +0800 | [diff] [blame] | 361 | ct->regs.ack = GPIO_ISR; |
| 362 | ct->regs.mask = GPIO_IMR; |
| 363 | |
| 364 | irq_setup_generic_chip(gc, IRQ_MSK(32), IRQ_GC_INIT_NESTED_LOCK, |
| 365 | IRQ_NOREQUEST, 0); |
Peng Fan | 9e26b0b | 2015-08-23 21:11:52 +0800 | [diff] [blame] | 366 | |
| 367 | return 0; |
Shawn Guo | e4ea933 | 2011-06-07 16:25:37 +0800 | [diff] [blame] | 368 | } |
Thomas Gleixner | b5eee2f | 2011-04-04 14:29:58 +0200 | [diff] [blame] | 369 | |
Bill Pemberton | 3836309 | 2012-11-19 13:22:34 -0500 | [diff] [blame] | 370 | static void mxc_gpio_get_hw(struct platform_device *pdev) |
Shawn Guo | e7fc6ae | 2011-07-07 00:37:41 +0800 | [diff] [blame] | 371 | { |
Shawn Guo | 8937cb6 | 2011-07-07 00:37:43 +0800 | [diff] [blame] | 372 | const struct of_device_id *of_id = |
| 373 | of_match_device(mxc_gpio_dt_ids, &pdev->dev); |
| 374 | enum mxc_gpio_hwtype hwtype; |
| 375 | |
| 376 | if (of_id) |
| 377 | pdev->id_entry = of_id->data; |
| 378 | hwtype = pdev->id_entry->driver_data; |
Shawn Guo | e7fc6ae | 2011-07-07 00:37:41 +0800 | [diff] [blame] | 379 | |
| 380 | if (mxc_gpio_hwtype) { |
| 381 | /* |
| 382 | * The driver works with a reasonable presupposition, |
| 383 | * that is all gpio ports must be the same type when |
| 384 | * running on one soc. |
| 385 | */ |
| 386 | BUG_ON(mxc_gpio_hwtype != hwtype); |
| 387 | return; |
| 388 | } |
| 389 | |
Benoît Thébaudeau | aeb2774 | 2012-06-22 21:04:06 +0200 | [diff] [blame] | 390 | if (hwtype == IMX35_GPIO) |
| 391 | mxc_gpio_hwdata = &imx35_gpio_hwdata; |
| 392 | else if (hwtype == IMX31_GPIO) |
Shawn Guo | e7fc6ae | 2011-07-07 00:37:41 +0800 | [diff] [blame] | 393 | mxc_gpio_hwdata = &imx31_gpio_hwdata; |
| 394 | else |
| 395 | mxc_gpio_hwdata = &imx1_imx21_gpio_hwdata; |
| 396 | |
| 397 | mxc_gpio_hwtype = hwtype; |
| 398 | } |
| 399 | |
Shawn Guo | 09ad803 | 2011-08-14 00:14:02 +0800 | [diff] [blame] | 400 | static int mxc_gpio_to_irq(struct gpio_chip *gc, unsigned offset) |
| 401 | { |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 402 | struct mxc_gpio_port *port = gpiochip_get_data(gc); |
Shawn Guo | 09ad803 | 2011-08-14 00:14:02 +0800 | [diff] [blame] | 403 | |
Shawn Guo | 1ab7ef1 | 2012-06-13 09:04:03 +0800 | [diff] [blame] | 404 | return irq_find_mapping(port->domain, offset); |
Shawn Guo | 09ad803 | 2011-08-14 00:14:02 +0800 | [diff] [blame] | 405 | } |
| 406 | |
Bill Pemberton | 3836309 | 2012-11-19 13:22:34 -0500 | [diff] [blame] | 407 | static int mxc_gpio_probe(struct platform_device *pdev) |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 408 | { |
Shawn Guo | 8937cb6 | 2011-07-07 00:37:43 +0800 | [diff] [blame] | 409 | struct device_node *np = pdev->dev.of_node; |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame] | 410 | struct mxc_gpio_port *port; |
| 411 | struct resource *iores; |
Shawn Guo | 1ab7ef1 | 2012-06-13 09:04:03 +0800 | [diff] [blame] | 412 | int irq_base; |
Shawn Guo | e4ea933 | 2011-06-07 16:25:37 +0800 | [diff] [blame] | 413 | int err; |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 414 | |
Shawn Guo | e7fc6ae | 2011-07-07 00:37:41 +0800 | [diff] [blame] | 415 | mxc_gpio_get_hw(pdev); |
| 416 | |
Fabio Estevam | 8cd73e4 | 2013-07-08 17:14:39 -0300 | [diff] [blame] | 417 | port = devm_kzalloc(&pdev->dev, sizeof(*port), GFP_KERNEL); |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame] | 418 | if (!port) |
| 419 | return -ENOMEM; |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 420 | |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame] | 421 | iores = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
Fabio Estevam | 8cd73e4 | 2013-07-08 17:14:39 -0300 | [diff] [blame] | 422 | port->base = devm_ioremap_resource(&pdev->dev, iores); |
| 423 | if (IS_ERR(port->base)) |
| 424 | return PTR_ERR(port->base); |
Baruch Siach | 14cb0de | 2010-07-06 14:03:22 +0300 | [diff] [blame] | 425 | |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame] | 426 | port->irq_high = platform_get_irq(pdev, 1); |
| 427 | port->irq = platform_get_irq(pdev, 0); |
Fabio Estevam | 8cd73e4 | 2013-07-08 17:14:39 -0300 | [diff] [blame] | 428 | if (port->irq < 0) |
Sachin Kamat | 5ea80e4 | 2013-12-21 13:05:57 +0530 | [diff] [blame] | 429 | return port->irq; |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 430 | |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame] | 431 | /* disable the interrupt and clear the status */ |
| 432 | writel(0, port->base + GPIO_IMR); |
| 433 | writel(~0, port->base + GPIO_ISR); |
| 434 | |
Shawn Guo | e7fc6ae | 2011-07-07 00:37:41 +0800 | [diff] [blame] | 435 | if (mxc_gpio_hwtype == IMX21_GPIO) { |
Uwe Kleine-König | 33a4e98 | 2012-06-06 11:49:23 +0200 | [diff] [blame] | 436 | /* |
| 437 | * Setup one handler for all GPIO interrupts. Actually setting |
| 438 | * the handler is needed only once, but doing it for every port |
| 439 | * is more robust and easier. |
| 440 | */ |
| 441 | irq_set_chained_handler(port->irq, mx2_gpio_irq_handler); |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame] | 442 | } else { |
| 443 | /* setup one handler for each entry */ |
Russell King | e65eea5 | 2015-06-16 23:06:40 +0100 | [diff] [blame] | 444 | irq_set_chained_handler_and_data(port->irq, |
| 445 | mx3_gpio_irq_handler, port); |
| 446 | if (port->irq_high > 0) |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame] | 447 | /* setup handler for GPIO 16 to 31 */ |
Russell King | e65eea5 | 2015-06-16 23:06:40 +0100 | [diff] [blame] | 448 | irq_set_chained_handler_and_data(port->irq_high, |
| 449 | mx3_gpio_irq_handler, |
| 450 | port); |
Sascha Hauer | 8afaada | 2009-06-15 12:36:25 +0200 | [diff] [blame] | 451 | } |
| 452 | |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 453 | err = bgpio_init(&port->gc, &pdev->dev, 4, |
Shawn Guo | 2ce420d | 2011-06-06 13:22:41 +0800 | [diff] [blame] | 454 | port->base + GPIO_PSR, |
| 455 | port->base + GPIO_DR, NULL, |
Vladimir Zapolskiy | 442b249 | 2015-04-29 18:35:01 +0300 | [diff] [blame] | 456 | port->base + GPIO_GDIR, NULL, |
| 457 | BGPIOF_READ_OUTPUT_REG_SET); |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame] | 458 | if (err) |
Fabio Estevam | 8cd73e4 | 2013-07-08 17:14:39 -0300 | [diff] [blame] | 459 | goto out_bgio; |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame] | 460 | |
Vladimir Zapolskiy | 4c806c9 | 2016-09-08 04:48:16 +0300 | [diff] [blame] | 461 | if (of_property_read_bool(np, "gpio-ranges")) { |
| 462 | port->gc.request = gpiochip_generic_request; |
| 463 | port->gc.free = gpiochip_generic_free; |
| 464 | } |
| 465 | |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 466 | port->gc.to_irq = mxc_gpio_to_irq; |
| 467 | port->gc.base = (pdev->id < 0) ? of_alias_get_id(np, "gpio") * 32 : |
Shawn Guo | 7e6086d | 2012-08-05 14:01:26 +0800 | [diff] [blame] | 468 | pdev->id * 32; |
Shawn Guo | 2ce420d | 2011-06-06 13:22:41 +0800 | [diff] [blame] | 469 | |
Laxman Dewangan | ffc5663 | 2016-02-22 17:43:28 +0530 | [diff] [blame] | 470 | err = devm_gpiochip_add_data(&pdev->dev, &port->gc, port); |
Shawn Guo | 2ce420d | 2011-06-06 13:22:41 +0800 | [diff] [blame] | 471 | if (err) |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 472 | goto out_bgio; |
Shawn Guo | 2ce420d | 2011-06-06 13:22:41 +0800 | [diff] [blame] | 473 | |
Bartosz Golaszewski | c553c3c | 2017-03-04 17:23:38 +0100 | [diff] [blame] | 474 | irq_base = devm_irq_alloc_descs(&pdev->dev, -1, 0, 32, numa_node_id()); |
Shawn Guo | 1ab7ef1 | 2012-06-13 09:04:03 +0800 | [diff] [blame] | 475 | if (irq_base < 0) { |
| 476 | err = irq_base; |
Laxman Dewangan | ffc5663 | 2016-02-22 17:43:28 +0530 | [diff] [blame] | 477 | goto out_bgio; |
Shawn Guo | 1ab7ef1 | 2012-06-13 09:04:03 +0800 | [diff] [blame] | 478 | } |
| 479 | |
| 480 | port->domain = irq_domain_add_legacy(np, 32, irq_base, 0, |
| 481 | &irq_domain_simple_ops, NULL); |
| 482 | if (!port->domain) { |
| 483 | err = -ENODEV; |
Bartosz Golaszewski | c553c3c | 2017-03-04 17:23:38 +0100 | [diff] [blame] | 484 | goto out_bgio; |
Shawn Guo | 1ab7ef1 | 2012-06-13 09:04:03 +0800 | [diff] [blame] | 485 | } |
Shawn Guo | 8937cb6 | 2011-07-07 00:37:43 +0800 | [diff] [blame] | 486 | |
| 487 | /* gpio-mxc can be a generic irq chip */ |
Peng Fan | 9e26b0b | 2015-08-23 21:11:52 +0800 | [diff] [blame] | 488 | err = mxc_gpio_init_gc(port, irq_base); |
| 489 | if (err < 0) |
| 490 | goto out_irqdomain_remove; |
Shawn Guo | 8937cb6 | 2011-07-07 00:37:43 +0800 | [diff] [blame] | 491 | |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame] | 492 | list_add_tail(&port->node, &mxc_gpio_ports); |
| 493 | |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 494 | return 0; |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame] | 495 | |
Peng Fan | 9e26b0b | 2015-08-23 21:11:52 +0800 | [diff] [blame] | 496 | out_irqdomain_remove: |
| 497 | irq_domain_remove(port->domain); |
Fabio Estevam | 8cd73e4 | 2013-07-08 17:14:39 -0300 | [diff] [blame] | 498 | out_bgio: |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame] | 499 | dev_info(&pdev->dev, "%s failed with errno %d\n", __func__, err); |
| 500 | return err; |
Juergen Beisert | 07bd1a6 | 2008-07-05 10:02:49 +0200 | [diff] [blame] | 501 | } |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame] | 502 | |
| 503 | static struct platform_driver mxc_gpio_driver = { |
| 504 | .driver = { |
| 505 | .name = "gpio-mxc", |
Shawn Guo | 8937cb6 | 2011-07-07 00:37:43 +0800 | [diff] [blame] | 506 | .of_match_table = mxc_gpio_dt_ids, |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame] | 507 | }, |
| 508 | .probe = mxc_gpio_probe, |
Shawn Guo | e7fc6ae | 2011-07-07 00:37:41 +0800 | [diff] [blame] | 509 | .id_table = mxc_gpio_devtype, |
Shawn Guo | b78d8e5 | 2011-06-06 00:07:55 +0800 | [diff] [blame] | 510 | }; |
| 511 | |
| 512 | static int __init gpio_mxc_init(void) |
| 513 | { |
| 514 | return platform_driver_register(&mxc_gpio_driver); |
| 515 | } |
Vladimir Zapolskiy | e188cbf | 2016-09-08 04:48:15 +0300 | [diff] [blame] | 516 | subsys_initcall(gpio_mxc_init); |