cregit-Linux how code gets into the kernel

Release 4.11 drivers/gpu/drm/nouveau/nvkm/subdev/i2c/auxg94.c

/*
 * 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 g94_i2c_aux(p) container_of((p), struct g94_i2c_aux, base)
#include "aux.h"


struct g94_i2c_aux {
	
struct nvkm_i2c_aux base;
	
int ch;
};


static void g94_i2c_aux_fini(struct g94_i2c_aux *aux) { struct nvkm_device *device = aux->base.pad->i2c->subdev.device; nvkm_mask(device, 0x00e4e4 + (aux->ch * 0x50), 0x00310000, 0x00000000); }

Contributors

PersonTokensPropCommitsCommitProp
Ben Skeggs47100.00%1100.00%
Total47100.00%1100.00%


static int g94_i2c_aux_init(struct g94_i2c_aux *aux) { struct nvkm_device *device = aux->base.pad->i2c->subdev.device; const u32 unksel = 1; /* nfi which to use, or if it matters.. */ const u32 ureq = unksel ? 0x00100000 : 0x00200000; const u32 urep = unksel ? 0x01000000 : 0x02000000; u32 ctrl, timeout; /* wait up to 1ms for any previous transaction to be done... */ timeout = 1000; do { ctrl = nvkm_rd32(device, 0x00e4e4 + (aux->ch * 0x50)); udelay(1); if (!timeout--) { AUX_ERR(&aux->base, "begin idle timeout %08x", ctrl); return -EBUSY; } } while (ctrl & 0x03010000); /* set some magic, and wait up to 1ms for it to appear */ nvkm_mask(device, 0x00e4e4 + (aux->ch * 0x50), 0x00300000, ureq); timeout = 1000; do { ctrl = nvkm_rd32(device, 0x00e4e4 + (aux->ch * 0x50)); udelay(1); if (!timeout--) { AUX_ERR(&aux->base, "magic wait %08x", ctrl); g94_i2c_aux_fini(aux); return -EBUSY; } } while ((ctrl & 0x03000000) != urep); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Ben Skeggs213100.00%1100.00%
Total213100.00%1100.00%


static int g94_i2c_aux_xfer(struct nvkm_i2c_aux *obj, bool retry, u8 type, u32 addr, u8 *data, u8 size) { struct g94_i2c_aux *aux = g94_i2c_aux(obj); struct nvkm_device *device = aux->base.pad->i2c->subdev.device; const u32 base = aux->ch * 0x50; u32 ctrl, stat, timeout, retries = 0; u32 xbuf[4] = {}; int ret, i; AUX_TRACE(&aux->base, "%d: %08x %d", type, addr, size); ret = g94_i2c_aux_init(aux); if (ret < 0) goto out; stat = nvkm_rd32(device, 0x00e4e8 + base); if (!(stat & 0x10000000)) { AUX_TRACE(&aux->base, "sink not detected"); ret = -ENXIO; goto out; } if (!(type & 1)) { memcpy(xbuf, data, size); for (i = 0; i < 16; i += 4) { AUX_TRACE(&aux->base, "wr %08x", xbuf[i / 4]); nvkm_wr32(device, 0x00e4c0 + base + i, xbuf[i / 4]); } } ctrl = nvkm_rd32(device, 0x00e4e4 + base); ctrl &= ~0x0001f0ff; ctrl |= type << 12; ctrl |= size - 1; nvkm_wr32(device, 0x00e4e0 + base, addr); /* (maybe) retry transaction a number of times on failure... */ do { /* reset, and delay a while if this is a retry */ nvkm_wr32(device, 0x00e4e4 + base, 0x80000000 | ctrl); nvkm_wr32(device, 0x00e4e4 + base, 0x00000000 | ctrl); if (retries) udelay(400); /* transaction request, wait up to 1ms for it to complete */ nvkm_wr32(device, 0x00e4e4 + base, 0x00010000 | ctrl); timeout = 1000; do { ctrl = nvkm_rd32(device, 0x00e4e4 + base); udelay(1); if (!timeout--) { AUX_ERR(&aux->base, "timeout %08x", ctrl); ret = -EIO; goto out; } } while (ctrl & 0x00010000); ret = 0; /* read status, and check if transaction completed ok */ stat = nvkm_mask(device, 0x00e4e8 + base, 0, 0); if ((stat & 0x000f0000) == 0x00080000 || (stat & 0x000f0000) == 0x00020000) ret = 1; if ((stat & 0x00000100)) ret = -ETIMEDOUT; if ((stat & 0x00000e00)) ret = -EIO; AUX_TRACE(&aux->base, "%02d %08x %08x", retries, ctrl, stat); } while (ret && retry && retries++ < 32); if (type & 1) { for (i = 0; i < 16; i += 4) { xbuf[i / 4] = nvkm_rd32(device, 0x00e4d0 + base + i); AUX_TRACE(&aux->base, "rd %08x", xbuf[i / 4]); } memcpy(data, xbuf, size); } out: g94_i2c_aux_fini(aux); return ret < 0 ? ret : (stat & 0x000f0000) >> 16; }

Contributors

PersonTokensPropCommitsCommitProp
Ben Skeggs568100.00%2100.00%
Total568100.00%2100.00%

static const struct nvkm_i2c_aux_func g94_i2c_aux_func = { .xfer = g94_i2c_aux_xfer, };
int g94_i2c_aux_new(struct nvkm_i2c_pad *pad, int index, u8 drive, struct nvkm_i2c_aux **paux) { struct g94_i2c_aux *aux; if (!(aux = kzalloc(sizeof(*aux), GFP_KERNEL))) return -ENOMEM; *paux = &aux->base; nvkm_i2c_aux_ctor(&g94_i2c_aux_func, pad, index, &aux->base); aux->ch = drive; aux->base.intr = 1 << aux->ch; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Ben Skeggs93100.00%1100.00%
Total93100.00%1100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Ben Skeggs957100.00%2100.00%
Total957100.00%2100.00%
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.