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      1 /*	$NetBSD: nouveau_nvkm_subdev_i2c_busnv50.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_busnv50.c,v 1.3 2021/12/18 23:45:40 riastradh Exp $");
     28 
     29 #define nv50_i2c_bus(p) container_of((p), struct nv50_i2c_bus, base)
     30 #include "bus.h"
     31 
     32 #include <subdev/vga.h>
     33 
     34 struct nv50_i2c_bus {
     35 	struct nvkm_i2c_bus base;
     36 	u32 addr;
     37 	u32 data;
     38 };
     39 
     40 static void
     41 nv50_i2c_bus_drive_scl(struct nvkm_i2c_bus *base, int state)
     42 {
     43 	struct nv50_i2c_bus *bus = nv50_i2c_bus(base);
     44 	struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
     45 	if (state) bus->data |= 0x01;
     46 	else	   bus->data &= 0xfe;
     47 	nvkm_wr32(device, bus->addr, bus->data);
     48 }
     49 
     50 static void
     51 nv50_i2c_bus_drive_sda(struct nvkm_i2c_bus *base, int state)
     52 {
     53 	struct nv50_i2c_bus *bus = nv50_i2c_bus(base);
     54 	struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
     55 	if (state) bus->data |= 0x02;
     56 	else	   bus->data &= 0xfd;
     57 	nvkm_wr32(device, bus->addr, bus->data);
     58 }
     59 
     60 static int
     61 nv50_i2c_bus_sense_scl(struct nvkm_i2c_bus *base)
     62 {
     63 	struct nv50_i2c_bus *bus = nv50_i2c_bus(base);
     64 	struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
     65 	return !!(nvkm_rd32(device, bus->addr) & 0x00000001);
     66 }
     67 
     68 static int
     69 nv50_i2c_bus_sense_sda(struct nvkm_i2c_bus *base)
     70 {
     71 	struct nv50_i2c_bus *bus = nv50_i2c_bus(base);
     72 	struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
     73 	return !!(nvkm_rd32(device, bus->addr) & 0x00000002);
     74 }
     75 
     76 static void
     77 nv50_i2c_bus_init(struct nvkm_i2c_bus *base)
     78 {
     79 	struct nv50_i2c_bus *bus = nv50_i2c_bus(base);
     80 	struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
     81 	nvkm_wr32(device, bus->addr, (bus->data = 0x00000007));
     82 }
     83 
     84 static const struct nvkm_i2c_bus_func
     85 nv50_i2c_bus_func = {
     86 	.init = nv50_i2c_bus_init,
     87 	.drive_scl = nv50_i2c_bus_drive_scl,
     88 	.drive_sda = nv50_i2c_bus_drive_sda,
     89 	.sense_scl = nv50_i2c_bus_sense_scl,
     90 	.sense_sda = nv50_i2c_bus_sense_sda,
     91 	.xfer = nvkm_i2c_bit_xfer,
     92 };
     93 
     94 int
     95 nv50_i2c_bus_new(struct nvkm_i2c_pad *pad, int id, u8 drive,
     96 		 struct nvkm_i2c_bus **pbus)
     97 {
     98 	static const u32 addr[] = {
     99 		0x00e138, 0x00e150, 0x00e168, 0x00e180,
    100 		0x00e254, 0x00e274, 0x00e764, 0x00e780,
    101 		0x00e79c, 0x00e7b8
    102 	};
    103 	struct nv50_i2c_bus *bus;
    104 
    105 	if (drive >= ARRAY_SIZE(addr)) {
    106 		nvkm_warn(&pad->i2c->subdev, "bus %d unknown\n", drive);
    107 		return -ENODEV;
    108 	}
    109 
    110 	if (!(bus = kzalloc(sizeof(*bus), GFP_KERNEL)))
    111 		return -ENOMEM;
    112 	*pbus = &bus->base;
    113 
    114 	nvkm_i2c_bus_ctor(&nv50_i2c_bus_func, pad, id, &bus->base);
    115 	bus->addr = addr[drive];
    116 	bus->data = 0x00000007;
    117 	return 0;
    118 }
    119