Adding upstream version 5.10.209.upstream/5.10.209

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 216 insertions, 0 deletions

diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/i2c/bit.c b/drivers/gpu/drm/nouveau/nvkm/subdev/i2c/bit.c
new file mode 100644
index 000000000..cdce11bba
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/i2c/bit.c
@@ -0,0 +1,216 @@
+/*
+ * Copyright 2012 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 busions 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 "bus.h"
+
+#ifdef CONFIG_NOUVEAU_I2C_INTERNAL
+#define T_TIMEOUT  2200000
+#define T_RISEFALL 1000
+#define T_HOLD     5000
+
+static inline void
+nvkm_i2c_drive_scl(struct nvkm_i2c_bus *bus, int state)
+{
+	bus->func->drive_scl(bus, state);
+}
+
+static inline void
+nvkm_i2c_drive_sda(struct nvkm_i2c_bus *bus, int state)
+{
+	bus->func->drive_sda(bus, state);
+}
+
+static inline int
+nvkm_i2c_sense_scl(struct nvkm_i2c_bus *bus)
+{
+	return bus->func->sense_scl(bus);
+}
+
+static inline int
+nvkm_i2c_sense_sda(struct nvkm_i2c_bus *bus)
+{
+	return bus->func->sense_sda(bus);
+}
+
+static void
+nvkm_i2c_delay(struct nvkm_i2c_bus *bus, u32 nsec)
+{
+	udelay((nsec + 500) / 1000);
+}
+
+static bool
+nvkm_i2c_raise_scl(struct nvkm_i2c_bus *bus)
+{
+	u32 timeout = T_TIMEOUT / T_RISEFALL;
+
+	nvkm_i2c_drive_scl(bus, 1);
+	do {
+		nvkm_i2c_delay(bus, T_RISEFALL);
+	} while (!nvkm_i2c_sense_scl(bus) && --timeout);
+
+	return timeout != 0;
+}
+
+static int
+i2c_start(struct nvkm_i2c_bus *bus)
+{
+	int ret = 0;
+
+	if (!nvkm_i2c_sense_scl(bus) ||
+	    !nvkm_i2c_sense_sda(bus)) {
+		nvkm_i2c_drive_scl(bus, 0);
+		nvkm_i2c_drive_sda(bus, 1);
+		if (!nvkm_i2c_raise_scl(bus))
+			ret = -EBUSY;
+	}
+
+	nvkm_i2c_drive_sda(bus, 0);
+	nvkm_i2c_delay(bus, T_HOLD);
+	nvkm_i2c_drive_scl(bus, 0);
+	nvkm_i2c_delay(bus, T_HOLD);
+	return ret;
+}
+
+static void
+i2c_stop(struct nvkm_i2c_bus *bus)
+{
+	nvkm_i2c_drive_scl(bus, 0);
+	nvkm_i2c_drive_sda(bus, 0);
+	nvkm_i2c_delay(bus, T_RISEFALL);
+
+	nvkm_i2c_drive_scl(bus, 1);
+	nvkm_i2c_delay(bus, T_HOLD);
+	nvkm_i2c_drive_sda(bus, 1);
+	nvkm_i2c_delay(bus, T_HOLD);
+}
+
+static int
+i2c_bitw(struct nvkm_i2c_bus *bus, int sda)
+{
+	nvkm_i2c_drive_sda(bus, sda);
+	nvkm_i2c_delay(bus, T_RISEFALL);
+
+	if (!nvkm_i2c_raise_scl(bus))
+		return -ETIMEDOUT;
+	nvkm_i2c_delay(bus, T_HOLD);
+
+	nvkm_i2c_drive_scl(bus, 0);
+	nvkm_i2c_delay(bus, T_HOLD);
+	return 0;
+}
+
+static int
+i2c_bitr(struct nvkm_i2c_bus *bus)
+{
+	int sda;
+
+	nvkm_i2c_drive_sda(bus, 1);
+	nvkm_i2c_delay(bus, T_RISEFALL);
+
+	if (!nvkm_i2c_raise_scl(bus))
+		return -ETIMEDOUT;
+	nvkm_i2c_delay(bus, T_HOLD);
+
+	sda = nvkm_i2c_sense_sda(bus);
+
+	nvkm_i2c_drive_scl(bus, 0);
+	nvkm_i2c_delay(bus, T_HOLD);
+	return sda;
+}
+
+static int
+nvkm_i2c_get_byte(struct nvkm_i2c_bus *bus, u8 *byte, bool last)
+{
+	int i, bit;
+
+	*byte = 0;
+	for (i = 7; i >= 0; i--) {
+		bit = i2c_bitr(bus);
+		if (bit < 0)
+			return bit;
+		*byte |= bit << i;
+	}
+
+	return i2c_bitw(bus, last ? 1 : 0);
+}
+
+static int
+nvkm_i2c_put_byte(struct nvkm_i2c_bus *bus, u8 byte)
+{
+	int i, ret;
+	for (i = 7; i >= 0; i--) {
+		ret = i2c_bitw(bus, !!(byte & (1 << i)));
+		if (ret < 0)
+			return ret;
+	}
+
+	ret = i2c_bitr(bus);
+	if (ret == 1) /* nack */
+		ret = -EIO;
+	return ret;
+}
+
+static int
+i2c_addr(struct nvkm_i2c_bus *bus, struct i2c_msg *msg)
+{
+	u32 addr = msg->addr << 1;
+	if (msg->flags & I2C_M_RD)
+		addr |= 1;
+	return nvkm_i2c_put_byte(bus, addr);
+}
+
+int
+nvkm_i2c_bit_xfer(struct nvkm_i2c_bus *bus, struct i2c_msg *msgs, int num)
+{
+	struct i2c_msg *msg = msgs;
+	int ret = 0, mcnt = num;
+
+	while (!ret && mcnt--) {
+		u8 remaining = msg->len;
+		u8 *ptr = msg->buf;
+
+		ret = i2c_start(bus);
+		if (ret == 0)
+			ret = i2c_addr(bus, msg);
+
+		if (msg->flags & I2C_M_RD) {
+			while (!ret && remaining--)
+				ret = nvkm_i2c_get_byte(bus, ptr++, !remaining);
+		} else {
+			while (!ret && remaining--)
+				ret = nvkm_i2c_put_byte(bus, *ptr++);
+		}
+
+		msg++;
+	}
+
+	i2c_stop(bus);
+	return (ret < 0) ? ret : num;
+}
+#else
+int
+nvkm_i2c_bit_xfer(struct nvkm_i2c_bus *bus, struct i2c_msg *msgs, int num)
+{
+	return -ENODEV;
+}
+#endif