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      1 /*	$NetBSD: nouveau_nvkm_subdev_i2c_busnv4e.c,v 1.3 2021/12/18 23:45:40 riastradh Exp $	*/
      2 
      3 /*
      4  * Copyright 2015 Red Hat Inc.
      5  *
      6  * Permission is hereby granted, free of charge, to any person obtaining a
      7  * copy of this software and associated documentation files (the "Software"),
      8  * to deal in the Software without restriction, including without limitation
      9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
     10  * and/or sell copies of the Software, and to permit persons to whom the
     11  * Software is furnished to do so, subject to the following conditions:
     12  *
     13  * The above copyright notice and this permission notice shall be included in
     14  * all copies or substantial busions of the Software.
     15  *
     16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     19  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
     20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
     21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
     22  * OTHER DEALINGS IN THE SOFTWARE.
     23  *
     24  * Authors: Ben Skeggs <bskeggs (at) redhat.com>
     25  */
     26 #include <sys/cdefs.h>
     27 __KERNEL_RCSID(0, "$NetBSD: nouveau_nvkm_subdev_i2c_busnv4e.c,v 1.3 2021/12/18 23:45:40 riastradh Exp $");
     28 
     29 #define nv4e_i2c_bus(p) container_of((p), struct nv4e_i2c_bus, base)
     30 #include "bus.h"
     31 
     32 struct nv4e_i2c_bus {
     33 	struct nvkm_i2c_bus base;
     34 	u32 addr;
     35 };
     36 
     37 static void
     38 nv4e_i2c_bus_drive_scl(struct nvkm_i2c_bus *base, int state)
     39 {
     40 	struct nv4e_i2c_bus *bus = nv4e_i2c_bus(base);
     41 	struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
     42 	nvkm_mask(device, bus->addr, 0x2f, state ? 0x21 : 0x01);
     43 }
     44 
     45 static void
     46 nv4e_i2c_bus_drive_sda(struct nvkm_i2c_bus *base, int state)
     47 {
     48 	struct nv4e_i2c_bus *bus = nv4e_i2c_bus(base);
     49 	struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
     50 	nvkm_mask(device, bus->addr, 0x1f, state ? 0x11 : 0x01);
     51 }
     52 
     53 static int
     54 nv4e_i2c_bus_sense_scl(struct nvkm_i2c_bus *base)
     55 {
     56 	struct nv4e_i2c_bus *bus = nv4e_i2c_bus(base);
     57 	struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
     58 	return !!(nvkm_rd32(device, bus->addr) & 0x00040000);
     59 }
     60 
     61 static int
     62 nv4e_i2c_bus_sense_sda(struct nvkm_i2c_bus *base)
     63 {
     64 	struct nv4e_i2c_bus *bus = nv4e_i2c_bus(base);
     65 	struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
     66 	return !!(nvkm_rd32(device, bus->addr) & 0x00080000);
     67 }
     68 
     69 static const struct nvkm_i2c_bus_func
     70 nv4e_i2c_bus_func = {
     71 	.drive_scl = nv4e_i2c_bus_drive_scl,
     72 	.drive_sda = nv4e_i2c_bus_drive_sda,
     73 	.sense_scl = nv4e_i2c_bus_sense_scl,
     74 	.sense_sda = nv4e_i2c_bus_sense_sda,
     75 	.xfer = nvkm_i2c_bit_xfer,
     76 };
     77 
     78 int
     79 nv4e_i2c_bus_new(struct nvkm_i2c_pad *pad, int id, u8 drive,
     80 		 struct nvkm_i2c_bus **pbus)
     81 {
     82 	struct nv4e_i2c_bus *bus;
     83 
     84 	if (!(bus = kzalloc(sizeof(*bus), GFP_KERNEL)))
     85 		return -ENOMEM;
     86 	*pbus = &bus->base;
     87 
     88 	nvkm_i2c_bus_ctor(&nv4e_i2c_bus_func, pad, id, &bus->base);
     89 	bus->addr = 0x600800 + drive;
     90 	return 0;
     91 }
     92