| /* |
| * Copyright 2009 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 portions 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 <subdev/i2c.h> |
| |
| /****************************************************************************** |
| * aux channel util functions |
| *****************************************************************************/ |
| #define AUX_DBG(fmt, args...) nv_debug(aux, "AUXCH(%d): " fmt, ch, ##args) |
| #define AUX_ERR(fmt, args...) nv_error(aux, "AUXCH(%d): " fmt, ch, ##args) |
| |
| static void |
| auxch_fini(struct nouveau_i2c *aux, int ch) |
| { |
| nv_mask(aux, 0x00e4e4 + (ch * 0x50), 0x00310000, 0x00000000); |
| } |
| |
| static int |
| auxch_init(struct nouveau_i2c *aux, int ch) |
| { |
| 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 = nv_rd32(aux, 0x00e4e4 + (ch * 0x50)); |
| udelay(1); |
| if (!timeout--) { |
| AUX_ERR("begin idle timeout 0x%08x\n", ctrl); |
| return -EBUSY; |
| } |
| } while (ctrl & 0x03010000); |
| |
| /* set some magic, and wait up to 1ms for it to appear */ |
| nv_mask(aux, 0x00e4e4 + (ch * 0x50), 0x00300000, ureq); |
| timeout = 1000; |
| do { |
| ctrl = nv_rd32(aux, 0x00e4e4 + (ch * 0x50)); |
| udelay(1); |
| if (!timeout--) { |
| AUX_ERR("magic wait 0x%08x\n", ctrl); |
| auxch_fini(aux, ch); |
| return -EBUSY; |
| } |
| } while ((ctrl & 0x03000000) != urep); |
| |
| return 0; |
| } |
| |
| static int |
| auxch_tx(struct nouveau_i2c *aux, int ch, u8 type, u32 addr, u8 *data, u8 size) |
| { |
| u32 ctrl, stat, timeout, retries; |
| u32 xbuf[4] = {}; |
| int ret, i; |
| |
| AUX_DBG("%d: 0x%08x %d\n", type, addr, size); |
| |
| ret = auxch_init(aux, ch); |
| if (ret) |
| goto out; |
| |
| stat = nv_rd32(aux, 0x00e4e8 + (ch * 0x50)); |
| if (!(stat & 0x10000000)) { |
| AUX_DBG("sink not detected\n"); |
| ret = -ENXIO; |
| goto out; |
| } |
| |
| if (!(type & 1)) { |
| memcpy(xbuf, data, size); |
| for (i = 0; i < 16; i += 4) { |
| AUX_DBG("wr 0x%08x\n", xbuf[i / 4]); |
| nv_wr32(aux, 0x00e4c0 + (ch * 0x50) + i, xbuf[i / 4]); |
| } |
| } |
| |
| ctrl = nv_rd32(aux, 0x00e4e4 + (ch * 0x50)); |
| ctrl &= ~0x0001f0ff; |
| ctrl |= type << 12; |
| ctrl |= size - 1; |
| nv_wr32(aux, 0x00e4e0 + (ch * 0x50), addr); |
| |
| /* retry transaction a number of times on failure... */ |
| ret = -EREMOTEIO; |
| for (retries = 0; retries < 32; retries++) { |
| /* reset, and delay a while if this is a retry */ |
| nv_wr32(aux, 0x00e4e4 + (ch * 0x50), 0x80000000 | ctrl); |
| nv_wr32(aux, 0x00e4e4 + (ch * 0x50), 0x00000000 | ctrl); |
| if (retries) |
| udelay(400); |
| |
| /* transaction request, wait up to 1ms for it to complete */ |
| nv_wr32(aux, 0x00e4e4 + (ch * 0x50), 0x00010000 | ctrl); |
| |
| timeout = 1000; |
| do { |
| ctrl = nv_rd32(aux, 0x00e4e4 + (ch * 0x50)); |
| udelay(1); |
| if (!timeout--) { |
| AUX_ERR("tx req timeout 0x%08x\n", ctrl); |
| goto out; |
| } |
| } while (ctrl & 0x00010000); |
| |
| /* read status, and check if transaction completed ok */ |
| stat = nv_mask(aux, 0x00e4e8 + (ch * 0x50), 0, 0); |
| if (!(stat & 0x000f0f00)) { |
| ret = 0; |
| break; |
| } |
| |
| AUX_DBG("%02d 0x%08x 0x%08x\n", retries, ctrl, stat); |
| } |
| |
| if (type & 1) { |
| for (i = 0; i < 16; i += 4) { |
| xbuf[i / 4] = nv_rd32(aux, 0x00e4d0 + (ch * 0x50) + i); |
| AUX_DBG("rd 0x%08x\n", xbuf[i / 4]); |
| } |
| memcpy(data, xbuf, size); |
| } |
| |
| out: |
| auxch_fini(aux, ch); |
| return ret; |
| } |
| |
| int |
| nv_rdaux(struct nouveau_i2c_port *auxch, u32 addr, u8 *data, u8 size) |
| { |
| return auxch_tx(auxch->i2c, auxch->drive, 9, addr, data, size); |
| } |
| |
| int |
| nv_wraux(struct nouveau_i2c_port *auxch, u32 addr, u8 *data, u8 size) |
| { |
| return auxch_tx(auxch->i2c, auxch->drive, 8, addr, data, size); |
| } |
| |
| static int |
| aux_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num) |
| { |
| struct nouveau_i2c_port *auxch = (struct nouveau_i2c_port *)adap; |
| struct i2c_msg *msg = msgs; |
| int ret, mcnt = num; |
| |
| while (mcnt--) { |
| u8 remaining = msg->len; |
| u8 *ptr = msg->buf; |
| |
| while (remaining) { |
| u8 cnt = (remaining > 16) ? 16 : remaining; |
| u8 cmd; |
| |
| if (msg->flags & I2C_M_RD) |
| cmd = 1; |
| else |
| cmd = 0; |
| |
| if (mcnt || remaining > 16) |
| cmd |= 4; /* MOT */ |
| |
| ret = auxch_tx(auxch->i2c, auxch->drive, cmd, |
| msg->addr, ptr, cnt); |
| if (ret < 0) |
| return ret; |
| |
| ptr += cnt; |
| remaining -= cnt; |
| } |
| |
| msg++; |
| } |
| |
| return num; |
| } |
| |
| static u32 |
| aux_func(struct i2c_adapter *adap) |
| { |
| return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL; |
| } |
| |
| const struct i2c_algorithm nouveau_i2c_aux_algo = { |
| .master_xfer = aux_xfer, |
| .functionality = aux_func |
| }; |