| 1 | /* |
| 2 | * qdev GPIO helpers |
| 3 | * |
| 4 | * Copyright (c) 2009 CodeSourcery |
| 5 | * |
| 6 | * This library is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU Lesser General Public |
| 8 | * License as published by the Free Software Foundation; either |
| 9 | * version 2 of the License, or (at your option) any later version. |
| 10 | * |
| 11 | * This library is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | * Lesser General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU Lesser General Public |
| 17 | * License along with this library; if not, see <http://www.gnu.org/licenses/>. |
| 18 | */ |
| 19 | |
| 20 | #include "qemu/osdep.h" |
| 21 | #include "hw/core/qdev.h" |
| 22 | #include "hw/core/irq.h" |
| 23 | #include "qapi/error.h" |
| 24 | |
| 25 | static NamedGPIOList *qdev_get_named_gpio_list(DeviceState *dev, |
| 26 | const char *name) |
| 27 | { |
| 28 | NamedGPIOList *ngl; |
| 29 | |
| 30 | QLIST_FOREACH(ngl, &dev->gpios, node) { |
| 31 | /* NULL is a valid and matchable name. */ |
| 32 | if (g_strcmp0(name, ngl->name) == 0) { |
| 33 | return ngl; |
| 34 | } |
| 35 | } |
| 36 | |
| 37 | ngl = g_malloc0(sizeof(*ngl)); |
| 38 | ngl->name = g_strdup(name); |
| 39 | QLIST_INSERT_HEAD(&dev->gpios, ngl, node); |
| 40 | return ngl; |
| 41 | } |
| 42 | |
| 43 | void qdev_init_gpio_in_named_with_opaque(DeviceState *dev, |
| 44 | qemu_irq_handler handler, |
| 45 | void *opaque, |
| 46 | const char *name, int n) |
| 47 | { |
| 48 | int i; |
| 49 | NamedGPIOList *gpio_list = qdev_get_named_gpio_list(dev, name); |
| 50 | |
| 51 | assert(gpio_list->num_out == 0 || !name); |
| 52 | gpio_list->in = qemu_extend_irqs(gpio_list->in, gpio_list->num_in, handler, |
| 53 | opaque, n); |
| 54 | |
| 55 | if (!name) { |
| 56 | name = "unnamed-gpio-in"; |
| 57 | } |
| 58 | for (i = gpio_list->num_in; i < gpio_list->num_in + n; i++) { |
| 59 | gchar *propname = g_strdup_printf("%s[%u]", name, i); |
| 60 | |
| 61 | object_property_add_child(OBJECT(dev), propname, |
| 62 | OBJECT(gpio_list->in[i])); |
| 63 | g_free(propname); |
| 64 | } |
| 65 | |
| 66 | gpio_list->num_in += n; |
| 67 | } |
| 68 | |
| 69 | void qdev_init_gpio_in(DeviceState *dev, qemu_irq_handler handler, int n) |
| 70 | { |
| 71 | qdev_init_gpio_in_named(dev, handler, NULL, n); |
| 72 | } |
| 73 | |
| 74 | void qdev_init_gpio_out_named(DeviceState *dev, qemu_irq *pins, |
| 75 | const char *name, int n) |
| 76 | { |
| 77 | int i; |
| 78 | NamedGPIOList *gpio_list = qdev_get_named_gpio_list(dev, name); |
| 79 | |
| 80 | assert(gpio_list->num_in == 0 || !name); |
| 81 | |
| 82 | if (!name) { |
| 83 | name = "unnamed-gpio-out"; |
| 84 | } |
| 85 | memset(pins, 0, sizeof(*pins) * n); |
| 86 | for (i = 0; i < n; ++i) { |
| 87 | gchar *propname = g_strdup_printf("%s[%u]", name, |
| 88 | gpio_list->num_out + i); |
| 89 | |
| 90 | object_property_add_link(OBJECT(dev), propname, TYPE_IRQ, |
| 91 | (Object **)&pins[i], |
| 92 | object_property_allow_set_link, |
| 93 | OBJ_PROP_LINK_STRONG); |
| 94 | g_free(propname); |
| 95 | } |
| 96 | gpio_list->num_out += n; |
| 97 | } |
| 98 | |
| 99 | void qdev_init_gpio_out(DeviceState *dev, qemu_irq *pins, int n) |
| 100 | { |
| 101 | qdev_init_gpio_out_named(dev, pins, NULL, n); |
| 102 | } |
| 103 | |
| 104 | qemu_irq qdev_get_gpio_in_named(DeviceState *dev, const char *name, int n) |
| 105 | { |
| 106 | NamedGPIOList *gpio_list = qdev_get_named_gpio_list(dev, name); |
| 107 | |
| 108 | assert(n >= 0 && n < gpio_list->num_in); |
| 109 | return gpio_list->in[n]; |
| 110 | } |
| 111 | |
| 112 | qemu_irq qdev_get_gpio_in(DeviceState *dev, int n) |
| 113 | { |
| 114 | return qdev_get_gpio_in_named(dev, NULL, n); |
| 115 | } |
| 116 | |
| 117 | void qdev_connect_gpio_out_named(DeviceState *dev, const char *name, int n, |
| 118 | qemu_irq input_pin) |
| 119 | { |
| 120 | char *propname = g_strdup_printf("%s[%d]", |
| 121 | name ? name : "unnamed-gpio-out", n); |
| 122 | if (input_pin && !OBJECT(input_pin)->parent) { |
| 123 | /* We need a name for object_property_set_link to work */ |
| 124 | object_property_add_child(machine_get_container("unattached"), |
| 125 | "non-qdev-gpio[*]", OBJECT(input_pin)); |
| 126 | } |
| 127 | object_property_set_link(OBJECT(dev), propname, |
| 128 | OBJECT(input_pin), &error_abort); |
| 129 | g_free(propname); |
| 130 | } |
| 131 | |
| 132 | qemu_irq qdev_get_gpio_out_connector(const DeviceState *dev, |
| 133 | const char *name, int n) |
| 134 | { |
| 135 | g_autofree char *propname = g_strdup_printf("%s[%d]", |
| 136 | name ? name : "unnamed-gpio-out", n); |
| 137 | |
| 138 | qemu_irq ret = (qemu_irq)object_property_get_link(OBJECT(dev), propname, |
| 139 | NULL); |
| 140 | |
| 141 | return ret; |
| 142 | } |
| 143 | |
| 144 | /* disconnect a GPIO output, returning the disconnected input (if any) */ |
| 145 | |
| 146 | static qemu_irq qdev_disconnect_gpio_out_named(DeviceState *dev, |
| 147 | const char *name, int n) |
| 148 | { |
| 149 | char *propname = g_strdup_printf("%s[%d]", |
| 150 | name ? name : "unnamed-gpio-out", n); |
| 151 | |
| 152 | qemu_irq ret = (qemu_irq)object_property_get_link(OBJECT(dev), propname, |
| 153 | NULL); |
| 154 | if (ret) { |
| 155 | object_property_set_link(OBJECT(dev), propname, NULL, NULL); |
| 156 | } |
| 157 | g_free(propname); |
| 158 | return ret; |
| 159 | } |
| 160 | |
| 161 | qemu_irq qdev_intercept_gpio_out(DeviceState *dev, qemu_irq icpt, |
| 162 | const char *name, int n) |
| 163 | { |
| 164 | qemu_irq disconnected = qdev_disconnect_gpio_out_named(dev, name, n); |
| 165 | qdev_connect_gpio_out_named(dev, name, n, icpt); |
| 166 | return disconnected; |
| 167 | } |
| 168 | |
| 169 | void qdev_connect_gpio_out(DeviceState *dev, int n, qemu_irq input_pin) |
| 170 | { |
| 171 | qdev_connect_gpio_out_named(dev, NULL, n, input_pin); |
| 172 | } |
| 173 | |
| 174 | void qdev_pass_gpios(DeviceState *dev, DeviceState *container, |
| 175 | const char *name) |
| 176 | { |
| 177 | int i; |
| 178 | NamedGPIOList *ngl = qdev_get_named_gpio_list(dev, name); |
| 179 | |
| 180 | for (i = 0; i < ngl->num_in; i++) { |
| 181 | const char *nm = ngl->name ? ngl->name : "unnamed-gpio-in"; |
| 182 | char *propname = g_strdup_printf("%s[%d]", nm, i); |
| 183 | |
| 184 | object_property_add_alias(OBJECT(container), propname, |
| 185 | OBJECT(dev), propname); |
| 186 | g_free(propname); |
| 187 | } |
| 188 | for (i = 0; i < ngl->num_out; i++) { |
| 189 | const char *nm = ngl->name ? ngl->name : "unnamed-gpio-out"; |
| 190 | char *propname = g_strdup_printf("%s[%d]", nm, i); |
| 191 | |
| 192 | object_property_add_alias(OBJECT(container), propname, |
| 193 | OBJECT(dev), propname); |
| 194 | g_free(propname); |
| 195 | } |
| 196 | QLIST_REMOVE(ngl, node); |
| 197 | QLIST_INSERT_HEAD(&container->gpios, ngl, node); |
| 198 | } |