drm/nouveau/gpio: reimplement as nouveau_gpio.c, fixing a number of issues
- moves out of nouveau_bios.c and demagics the logical state definitions
- simplifies chipset-specific driver interface
- makes most of gpio irq handling common, will use for nv4x hpd later
- api extended to allow both direct gpio access, and access using the
logical function states
- api extended to allow for future use of gpio extender chips
- pre-nv50 was handled very badly, the main issue being that all GPIOs
were being treated as output-only.
- fixes nvd0 so gpio changes actually stick, magic reg needs bashing
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
diff --git a/drivers/gpu/drm/nouveau/nouveau_gpio.c b/drivers/gpu/drm/nouveau/nouveau_gpio.c
new file mode 100644
index 0000000..a580cc6
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nouveau_gpio.c
@@ -0,0 +1,400 @@
+/*
+ * Copyright 2011 Red Hat Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: Ben Skeggs
+ */
+
+#include "drmP.h"
+#include "nouveau_drv.h"
+#include "nouveau_i2c.h"
+#include "nouveau_gpio.h"
+
+static u8 *
+dcb_gpio_table(struct drm_device *dev)
+{
+ u8 *dcb = dcb_table(dev);
+ if (dcb) {
+ if (dcb[0] >= 0x30 && dcb[1] >= 0x0c)
+ return ROMPTR(dev, dcb[0x0a]);
+ if (dcb[0] >= 0x22 && dcb[-1] >= 0x13)
+ return ROMPTR(dev, dcb[-15]);
+ }
+ return NULL;
+}
+
+static u8 *
+dcb_gpio_entry(struct drm_device *dev, int idx, int ent, u8 *version)
+{
+ u8 *table = dcb_gpio_table(dev);
+ if (table) {
+ *version = table[0];
+ if (*version < 0x30 && ent < table[2])
+ return table + 3 + (ent * table[1]);
+ else if (ent < table[2])
+ return table + table[1] + (ent * table[3]);
+ }
+ return NULL;
+}
+
+int
+nouveau_gpio_drive(struct drm_device *dev, int idx, int line, int dir, int out)
+{
+ struct drm_nouveau_private *dev_priv = dev->dev_private;
+ struct nouveau_gpio_engine *pgpio = &dev_priv->engine.gpio;
+
+ return pgpio->drive ? pgpio->drive(dev, line, dir, out) : -ENODEV;
+}
+
+int
+nouveau_gpio_sense(struct drm_device *dev, int idx, int line)
+{
+ struct drm_nouveau_private *dev_priv = dev->dev_private;
+ struct nouveau_gpio_engine *pgpio = &dev_priv->engine.gpio;
+
+ return pgpio->sense ? pgpio->sense(dev, line) : -ENODEV;
+}
+
+int
+nouveau_gpio_find(struct drm_device *dev, int idx, u8 func, u8 line,
+ struct gpio_func *gpio)
+{
+ u8 *table, *entry, version;
+ int i = -1;
+
+ if (line == 0xff && func == 0xff)
+ return -EINVAL;
+
+ while ((entry = dcb_gpio_entry(dev, idx, ++i, &version))) {
+ if (version < 0x40) {
+ u16 data = ROM16(entry[0]);
+ *gpio = (struct gpio_func) {
+ .line = (data & 0x001f) >> 0,
+ .func = (data & 0x07e0) >> 5,
+ .log[0] = (data & 0x1800) >> 11,
+ .log[1] = (data & 0x6000) >> 13,
+ };
+ } else
+ if (version < 0x41) {
+ *gpio = (struct gpio_func) {
+ .line = entry[0] & 0x1f,
+ .func = entry[1],
+ .log[0] = (entry[3] & 0x18) >> 3,
+ .log[1] = (entry[3] & 0x60) >> 5,
+ };
+ } else {
+ *gpio = (struct gpio_func) {
+ .line = entry[0] & 0x3f,
+ .func = entry[1],
+ .log[0] = (entry[4] & 0x30) >> 4,
+ .log[1] = (entry[4] & 0xc0) >> 6,
+ };
+ }
+
+ if ((line == 0xff || line == gpio->line) &&
+ (func == 0xff || func == gpio->func))
+ return 0;
+ }
+
+ /* DCB 2.2, fixed TVDAC GPIO data */
+ if ((table = dcb_table(dev)) && table[0] >= 0x22) {
+ if (func == DCB_GPIO_TVDAC0) {
+ *gpio = (struct gpio_func) {
+ .func = DCB_GPIO_TVDAC0,
+ .line = table[-4] >> 4,
+ .log[0] = !!(table[-5] & 2),
+ .log[1] = !(table[-5] & 2),
+ };
+ return 0;
+ }
+ }
+
+ /* Apple iMac G4 NV18 */
+ if (nv_match_device(dev, 0x0189, 0x10de, 0x0010)) {
+ if (func == DCB_GPIO_TVDAC0) {
+ *gpio = (struct gpio_func) {
+ .func = DCB_GPIO_TVDAC0,
+ .line = 4,
+ .log[0] = 0,
+ .log[1] = 1,
+ };
+ return 0;
+ }
+ }
+
+ return -EINVAL;
+}
+
+int
+nouveau_gpio_set(struct drm_device *dev, int idx, u8 tag, u8 line, int state)
+{
+ struct gpio_func gpio;
+ int ret;
+
+ ret = nouveau_gpio_find(dev, idx, tag, line, &gpio);
+ if (ret == 0) {
+ int dir = !!(gpio.log[state] & 0x02);
+ int out = !!(gpio.log[state] & 0x01);
+ ret = nouveau_gpio_drive(dev, idx, gpio.line, dir, out);
+ }
+
+ return ret;
+}
+
+int
+nouveau_gpio_get(struct drm_device *dev, int idx, u8 tag, u8 line)
+{
+ struct gpio_func gpio;
+ int ret;
+
+ ret = nouveau_gpio_find(dev, idx, tag, line, &gpio);
+ if (ret == 0) {
+ ret = nouveau_gpio_sense(dev, idx, gpio.line);
+ if (ret >= 0)
+ ret = (ret == (gpio.log[1] & 1));
+ }
+
+ return ret;
+}
+
+int
+nouveau_gpio_irq(struct drm_device *dev, int idx, u8 tag, u8 line, bool on)
+{
+ struct drm_nouveau_private *dev_priv = dev->dev_private;
+ struct nouveau_gpio_engine *pgpio = &dev_priv->engine.gpio;
+ struct gpio_func gpio;
+ int ret;
+
+ ret = nouveau_gpio_find(dev, idx, tag, line, &gpio);
+ if (ret == 0) {
+ if (idx == 0 && pgpio->irq_enable)
+ pgpio->irq_enable(dev, gpio.line, on);
+ else
+ ret = -ENODEV;
+ }
+
+ return ret;
+}
+
+struct gpio_isr {
+ struct drm_device *dev;
+ struct list_head head;
+ struct work_struct work;
+ int idx;
+ struct gpio_func func;
+ void (*handler)(void *, int);
+ void *data;
+ bool inhibit;
+};
+
+static void
+nouveau_gpio_isr_bh(struct work_struct *work)
+{
+ struct gpio_isr *isr = container_of(work, struct gpio_isr, work);
+ struct drm_device *dev = isr->dev;
+ struct drm_nouveau_private *dev_priv = dev->dev_private;
+ struct nouveau_gpio_engine *pgpio = &dev_priv->engine.gpio;
+ unsigned long flags;
+ int state;
+
+ state = nouveau_gpio_get(dev, isr->idx, isr->func.func, isr->func.line);
+ if (state >= 0)
+ isr->handler(isr->data, state);
+
+ spin_lock_irqsave(&pgpio->lock, flags);
+ isr->inhibit = false;
+ spin_unlock_irqrestore(&pgpio->lock, flags);
+}
+
+void
+nouveau_gpio_isr(struct drm_device *dev, int idx, u32 line_mask)
+{
+ struct drm_nouveau_private *dev_priv = dev->dev_private;
+ struct nouveau_gpio_engine *pgpio = &dev_priv->engine.gpio;
+ struct gpio_isr *isr;
+
+ if (idx != 0)
+ return;
+
+ spin_lock(&pgpio->lock);
+ list_for_each_entry(isr, &pgpio->isr, head) {
+ if (line_mask & (1 << isr->func.line)) {
+ if (isr->inhibit)
+ continue;
+ isr->inhibit = true;
+ schedule_work(&isr->work);
+ }
+ }
+ spin_unlock(&pgpio->lock);
+}
+
+int
+nouveau_gpio_isr_add(struct drm_device *dev, int idx, u8 tag, u8 line,
+ void (*handler)(void *, int), void *data)
+{
+ struct drm_nouveau_private *dev_priv = dev->dev_private;
+ struct nouveau_gpio_engine *pgpio = &dev_priv->engine.gpio;
+ struct gpio_isr *isr;
+ unsigned long flags;
+ int ret;
+
+ isr = kzalloc(sizeof(*isr), GFP_KERNEL);
+ if (!isr)
+ return -ENOMEM;
+
+ ret = nouveau_gpio_find(dev, idx, tag, line, &isr->func);
+ if (ret) {
+ kfree(isr);
+ return ret;
+ }
+
+ INIT_WORK(&isr->work, nouveau_gpio_isr_bh);
+ isr->dev = dev;
+ isr->handler = handler;
+ isr->data = data;
+ isr->idx = idx;
+
+ spin_lock_irqsave(&pgpio->lock, flags);
+ list_add(&isr->head, &pgpio->isr);
+ spin_unlock_irqrestore(&pgpio->lock, flags);
+ return 0;
+}
+
+void
+nouveau_gpio_isr_del(struct drm_device *dev, int idx, u8 tag, u8 line,
+ void (*handler)(void *, int), void *data)
+{
+ struct drm_nouveau_private *dev_priv = dev->dev_private;
+ struct nouveau_gpio_engine *pgpio = &dev_priv->engine.gpio;
+ struct gpio_isr *isr, *tmp;
+ struct gpio_func func;
+ unsigned long flags;
+ LIST_HEAD(tofree);
+ int ret;
+
+ ret = nouveau_gpio_find(dev, idx, tag, line, &func);
+ if (ret == 0) {
+ spin_lock_irqsave(&pgpio->lock, flags);
+ list_for_each_entry_safe(isr, tmp, &pgpio->isr, head) {
+ if (memcmp(&isr->func, &func, sizeof(func)) ||
+ isr->idx != idx ||
+ isr->handler != handler || isr->data != data)
+ continue;
+ list_move(&isr->head, &tofree);
+ }
+ spin_unlock_irqrestore(&pgpio->lock, flags);
+
+ list_for_each_entry_safe(isr, tmp, &tofree, head) {
+ flush_work_sync(&isr->work);
+ kfree(isr);
+ }
+ }
+}
+
+int
+nouveau_gpio_create(struct drm_device *dev)
+{
+ struct drm_nouveau_private *dev_priv = dev->dev_private;
+ struct nouveau_gpio_engine *pgpio = &dev_priv->engine.gpio;
+
+ INIT_LIST_HEAD(&pgpio->isr);
+ spin_lock_init(&pgpio->lock);
+
+ return nouveau_gpio_init(dev);
+}
+
+void
+nouveau_gpio_destroy(struct drm_device *dev)
+{
+ struct drm_nouveau_private *dev_priv = dev->dev_private;
+ struct nouveau_gpio_engine *pgpio = &dev_priv->engine.gpio;
+
+ nouveau_gpio_fini(dev);
+ BUG_ON(!list_empty(&pgpio->isr));
+}
+
+int
+nouveau_gpio_init(struct drm_device *dev)
+{
+ struct drm_nouveau_private *dev_priv = dev->dev_private;
+ struct nouveau_gpio_engine *pgpio = &dev_priv->engine.gpio;
+ int ret = 0;
+
+ if (pgpio->init)
+ ret = pgpio->init(dev);
+
+ return ret;
+}
+
+void
+nouveau_gpio_fini(struct drm_device *dev)
+{
+ struct drm_nouveau_private *dev_priv = dev->dev_private;
+ struct nouveau_gpio_engine *pgpio = &dev_priv->engine.gpio;
+
+ if (pgpio->fini)
+ pgpio->fini(dev);
+}
+
+void
+nouveau_gpio_reset(struct drm_device *dev)
+{
+ struct drm_nouveau_private *dev_priv = dev->dev_private;
+ u8 *entry, version;
+ int ent = -1;
+
+ while ((entry = dcb_gpio_entry(dev, 0, ++ent, &version))) {
+ u8 func = 0xff, line, defs, unk0, unk1;
+ if (version >= 0x41) {
+ defs = !!(entry[0] & 0x80);
+ line = entry[0] & 0x3f;
+ func = entry[1];
+ unk0 = entry[2];
+ unk1 = entry[3] & 0x1f;
+ } else
+ if (version >= 0x40) {
+ line = entry[0] & 0x1f;
+ func = entry[1];
+ defs = !!(entry[3] & 0x01);
+ unk0 = !!(entry[3] & 0x02);
+ unk1 = !!(entry[3] & 0x04);
+ } else {
+ break;
+ }
+
+ if (func == 0xff)
+ continue;
+
+ nouveau_gpio_func_set(dev, func, defs);
+
+ if (dev_priv->card_type >= NV_D0) {
+ nv_mask(dev, 0x00d610 + (line * 4), 0xff, unk0);
+ if (unk1--)
+ nv_mask(dev, 0x00d640 + (unk1 * 4), 0xff, line);
+ } else
+ if (dev_priv->card_type >= NV_50) {
+ static const u32 regs[] = { 0xe100, 0xe28c };
+ u32 val = (unk1 << 16) | unk0;
+ u32 reg = regs[line >> 4]; line &= 0x0f;
+
+ nv_mask(dev, reg, 0x00010001 << line, val << line);
+ }
+ }
+}