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path: root/drivers/gpu/drm/nouveau/nvkm/subdev/i2c/busnv4e.c
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Diffstat (limited to 'drivers/gpu/drm/nouveau/nvkm/subdev/i2c/busnv4e.c')
-rw-r--r--drivers/gpu/drm/nouveau/nvkm/subdev/i2c/busnv4e.c86
1 files changed, 86 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/i2c/busnv4e.c b/drivers/gpu/drm/nouveau/nvkm/subdev/i2c/busnv4e.c
new file mode 100644
index 000000000000..cdd73dcb1197
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/i2c/busnv4e.c
@@ -0,0 +1,86 @@
+/*
+ * Copyright 2015 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 <bskeggs@redhat.com>
+ */
+#define nv4e_i2c_bus(p) container_of((p), struct nv4e_i2c_bus, base)
+#include "bus.h"
+
+struct nv4e_i2c_bus {
+ struct nvkm_i2c_bus base;
+ u32 addr;
+};
+
+static void
+nv4e_i2c_bus_drive_scl(struct nvkm_i2c_bus *base, int state)
+{
+ struct nv4e_i2c_bus *bus = nv4e_i2c_bus(base);
+ struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
+ nvkm_mask(device, bus->addr, 0x2f, state ? 0x21 : 0x01);
+}
+
+static void
+nv4e_i2c_bus_drive_sda(struct nvkm_i2c_bus *base, int state)
+{
+ struct nv4e_i2c_bus *bus = nv4e_i2c_bus(base);
+ struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
+ nvkm_mask(device, bus->addr, 0x1f, state ? 0x11 : 0x01);
+}
+
+static int
+nv4e_i2c_bus_sense_scl(struct nvkm_i2c_bus *base)
+{
+ struct nv4e_i2c_bus *bus = nv4e_i2c_bus(base);
+ struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
+ return !!(nvkm_rd32(device, bus->addr) & 0x00040000);
+}
+
+static int
+nv4e_i2c_bus_sense_sda(struct nvkm_i2c_bus *base)
+{
+ struct nv4e_i2c_bus *bus = nv4e_i2c_bus(base);
+ struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
+ return !!(nvkm_rd32(device, bus->addr) & 0x00080000);
+}
+
+static const struct nvkm_i2c_bus_func
+nv4e_i2c_bus_func = {
+ .drive_scl = nv4e_i2c_bus_drive_scl,
+ .drive_sda = nv4e_i2c_bus_drive_sda,
+ .sense_scl = nv4e_i2c_bus_sense_scl,
+ .sense_sda = nv4e_i2c_bus_sense_sda,
+ .xfer = nvkm_i2c_bit_xfer,
+};
+
+int
+nv4e_i2c_bus_new(struct nvkm_i2c_pad *pad, int id, u8 drive,
+ struct nvkm_i2c_bus **pbus)
+{
+ struct nv4e_i2c_bus *bus;
+
+ if (!(bus = kzalloc(sizeof(*bus), GFP_KERNEL)))
+ return -ENOMEM;
+ *pbus = &bus->base;
+
+ nvkm_i2c_bus_ctor(&nv4e_i2c_bus_func, pad, id, &bus->base);
+ bus->addr = 0x600800 + drive;
+ return 0;
+}