/* FEC mode setting is not supported in early FW versions */
ret = regmap_read(nn->regmap, N3000_NIOS_FW_VERSION, &val); if (ret) return ret;
if (FIELD_GET(N3000_NIOS_FW_VERSION_MAJOR, val) < 3) return sysfs_emit(buf, "not supported\n");
/* If no 25G links, FEC mode setting is not supported either */
ret = get_retimer_mode(nn, N3000_NIOS_PKVL_A_MODE_STS, &retimer_a_mode); if (ret) return ret;
ret = get_retimer_mode(nn, N3000_NIOS_PKVL_B_MODE_STS, &retimer_b_mode); if (ret) return ret;
if (!IS_RETIMER_FEC_SUPPORTED(retimer_a_mode) &&
!IS_RETIMER_FEC_SUPPORTED(retimer_b_mode)) return sysfs_emit(buf, "not supported\n");
/* get the valid FEC mode for 25G links */
ret = regmap_read(nn->regmap, N3000_NIOS_INIT, &val); if (ret) return ret;
/* * FEC mode should always be the same for all links, as we set them * in this way.
*/
fec_modes = (val & N3000_NIOS_INIT_REQ_FEC_MODE_MSK_ALL); if (fec_modes == N3000_NIOS_INIT_REQ_FEC_MODE_NO_ALL) return sysfs_emit(buf, "no\n"); elseif (fec_modes == N3000_NIOS_INIT_REQ_FEC_MODE_KR_ALL) return sysfs_emit(buf, "kr\n"); elseif (fec_modes == N3000_NIOS_INIT_REQ_FEC_MODE_RS_ALL) return sysfs_emit(buf, "rs\n");
/* * The SPI is shared by the Nios core inside the FPGA, Nios will use * this SPI master to do some one time initialization after power up, * and then release the control to OS. The driver needs to poll on * INIT_DONE to see when driver could take the control. * * Please note that after Nios firmware version 3.0.0, INIT_START is * introduced, so driver needs to trigger START firstly and then check * INIT_DONE.
*/
ret = regmap_read(nn->regmap, N3000_NIOS_FW_VERSION, &val); if (ret) return ret;
/* * If Nios version register is totally uninitialized(== 0x0), then the * Nios firmware is missing. So host could take control of SPI master * safely, but initialization work for Nios is not done. To restore the * card, we need to reprogram a new Nios firmware via the BMC chip on * SPI bus. So the driver doesn't error out, it continues to create the * spi controller device and spi_board_info for BMC.
*/ if (val == 0) {
dev_err(dev, "Nios version reg = 0x%x, skip INIT_DONE check, but the retimer may be uninitialized\n",
val); return 0;
}
if (FIELD_GET(N3000_NIOS_FW_VERSION_MAJOR, val) >= 3) { /* read NIOS_INIT to check if retimer initialization is done */
ret = regmap_read(nn->regmap, N3000_NIOS_INIT, &val); if (ret) return ret;
/* check if retimers are initialized already */ if (val & (N3000_NIOS_INIT_DONE | N3000_NIOS_INIT_START)) goto nios_init_done;
/* configure FEC mode per module param */
val = N3000_NIOS_INIT_START;
/* * When the retimer is to be set to 10G mode, there is no FEC * mode setting, so the REQ_FEC_MODE field will be ignored by * Nios firmware in this case. But we should still fill the FEC * mode field cause host could not get the retimer working mode * until the Nios init is done. * * For now the driver doesn't support the retimer FEC mode * switching per user's request. It is always set to Reed * Solomon FEC. * * The driver will set the same FEC mode for all links.
*/
val |= N3000_NIOS_INIT_REQ_FEC_MODE_RS_ALL;
ret = regmap_write(nn->regmap, N3000_NIOS_INIT, val); if (ret) return ret;
}
nios_init_done: /* polls on NIOS_INIT_DONE */
ret = regmap_read_poll_timeout(nn->regmap, N3000_NIOS_INIT, val,
val & N3000_NIOS_INIT_DONE,
N3000_NIOS_INIT_TIME_INTV,
N3000_NIOS_INIT_TIMEOUT); if (ret)
dev_err(dev, "NIOS_INIT_DONE %s\n",
(ret == -ETIMEDOUT) ? "timed out" : "check error");
ret2 = regmap_read(nn->regmap, N3000_NIOS_PKVL_A_MODE_STS, &state_a); if (ret2) return ret2;
ret2 = regmap_read(nn->regmap, N3000_NIOS_PKVL_B_MODE_STS, &state_b); if (ret2) return ret2;
if (!ret) { /* * After INIT_DONE is detected, it still needs to check if the * Nios firmware reports any error during the retimer * configuration.
*/ if (IS_MODE_STATUS_OK(state_a) && IS_MODE_STATUS_OK(state_b)) return 0;
/* * If the retimer configuration is failed, the Nios firmware * will still release the spi controller for host to * communicate with the BMC. It makes possible for people to * reprogram a new Nios firmware and restore the card. So the * driver doesn't error out, it continues to create the spi * controller device and spi_board_info for BMC.
*/
dev_err(dev, "NIOS_INIT_DONE OK, but err on retimer init\n");
}
staticint n3000_nios_poll_stat_timeout(void __iomem *base, u64 *v)
{ int loops;
/* * We don't use the time based timeout here for performance. * * The regbus read/write is on the critical path of Intel PAC N3000 * image programming. The time based timeout checking will add too much * overhead on it. Usually the state changes in 1 or 2 loops on the * test server, and we set 10000 times loop here for safety.
*/ for (loops = N3000_NIOS_REGBUS_RETRY_COUNT; loops > 0 ; loops--) {
*v = readq(base + N3000_NS_STAT); if (*v & N3000_NS_STAT_RW_VAL) break;
cpu_relax();
}
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