// SPDX-License-Identifier: (GPL-2.0 OR MIT)
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/* Microsemi Ocelot Switch driver
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*
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* Copyright (c) 2019 Microsemi Corporation
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*/
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#include <soc/mscc/ocelot.h>
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#include "ocelot_police.h"
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/* Types for ANA:POL[0-192]:POL_MODE_CFG.FRM_MODE */
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#define POL_MODE_LINERATE 0 /* Incl IPG. Unit: 33 1/3 kbps, 4096 bytes */
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#define POL_MODE_DATARATE 1 /* Excl IPG. Unit: 33 1/3 kbps, 4096 bytes */
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#define POL_MODE_FRMRATE_HI 2 /* Unit: 33 1/3 fps, 32.8 frames */
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#define POL_MODE_FRMRATE_LO 3 /* Unit: 1/3 fps, 0.3 frames */
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/* Policer indexes */
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#define POL_IX_PORT 0 /* 0-11 : Port policers */
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#define POL_IX_QUEUE 32 /* 32-127 : Queue policers */
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/* Default policer order */
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#define POL_ORDER 0x1d3 /* Ocelot policer order: Serial (QoS -> Port -> VCAP) */
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int qos_policer_conf_set(struct ocelot *ocelot, int port, u32 pol_ix,
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struct qos_policer_conf *conf)
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{
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u32 cf = 0, cir_ena = 0, frm_mode = POL_MODE_LINERATE;
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u32 cir = 0, cbs = 0, pir = 0, pbs = 0;
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bool cir_discard = 0, pir_discard = 0;
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u32 pbs_max = 0, cbs_max = 0;
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u8 ipg = 20;
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u32 value;
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pir = conf->pir;
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pbs = conf->pbs;
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switch (conf->mode) {
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case MSCC_QOS_RATE_MODE_LINE:
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case MSCC_QOS_RATE_MODE_DATA:
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if (conf->mode == MSCC_QOS_RATE_MODE_LINE) {
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frm_mode = POL_MODE_LINERATE;
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ipg = min_t(u8, GENMASK(4, 0), conf->ipg);
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} else {
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frm_mode = POL_MODE_DATARATE;
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}
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if (conf->dlb) {
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cir_ena = 1;
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cir = conf->cir;
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cbs = conf->cbs;
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if (cir == 0 && cbs == 0) {
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/* Discard cir frames */
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cir_discard = 1;
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} else {
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cir = DIV_ROUND_UP(cir, 100);
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cir *= 3; /* 33 1/3 kbps */
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cbs = DIV_ROUND_UP(cbs, 4096);
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cbs = (cbs ? cbs : 1); /* No zero burst size */
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cbs_max = 60; /* Limit burst size */
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cf = conf->cf;
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if (cf)
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pir += conf->cir;
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}
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}
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if (pir == 0 && pbs == 0) {
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/* Discard PIR frames */
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pir_discard = 1;
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} else {
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pir = DIV_ROUND_UP(pir, 100);
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pir *= 3; /* 33 1/3 kbps */
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pbs = DIV_ROUND_UP(pbs, 4096);
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pbs = (pbs ? pbs : 1); /* No zero burst size */
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pbs_max = 60; /* Limit burst size */
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}
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break;
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case MSCC_QOS_RATE_MODE_FRAME:
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if (pir >= 100) {
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frm_mode = POL_MODE_FRMRATE_HI;
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pir = DIV_ROUND_UP(pir, 100);
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pir *= 3; /* 33 1/3 fps */
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pbs = (pbs * 10) / 328; /* 32.8 frames */
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pbs = (pbs ? pbs : 1); /* No zero burst size */
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pbs_max = GENMASK(6, 0); /* Limit burst size */
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} else {
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frm_mode = POL_MODE_FRMRATE_LO;
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if (pir == 0 && pbs == 0) {
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/* Discard all frames */
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pir_discard = 1;
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cir_discard = 1;
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} else {
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pir *= 3; /* 1/3 fps */
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pbs = (pbs * 10) / 3; /* 0.3 frames */
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pbs = (pbs ? pbs : 1); /* No zero burst size */
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pbs_max = 61; /* Limit burst size */
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}
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}
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break;
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default: /* MSCC_QOS_RATE_MODE_DISABLED */
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/* Disable policer using maximum rate and zero burst */
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pir = GENMASK(15, 0);
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pbs = 0;
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break;
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}
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/* Check limits */
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if (pir > GENMASK(15, 0)) {
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dev_err(ocelot->dev, "Invalid pir for port %d: %u (max %lu)\n",
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port, pir, GENMASK(15, 0));
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return -EINVAL;
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}
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if (cir > GENMASK(15, 0)) {
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dev_err(ocelot->dev, "Invalid cir for port %d: %u (max %lu)\n",
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port, cir, GENMASK(15, 0));
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return -EINVAL;
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}
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if (pbs > pbs_max) {
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dev_err(ocelot->dev, "Invalid pbs for port %d: %u (max %u)\n",
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port, pbs, pbs_max);
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return -EINVAL;
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}
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if (cbs > cbs_max) {
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dev_err(ocelot->dev, "Invalid cbs for port %d: %u (max %u)\n",
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port, cbs, cbs_max);
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return -EINVAL;
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}
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value = (ANA_POL_MODE_CFG_IPG_SIZE(ipg) |
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ANA_POL_MODE_CFG_FRM_MODE(frm_mode) |
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(cf ? ANA_POL_MODE_CFG_DLB_COUPLED : 0) |
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(cir_ena ? ANA_POL_MODE_CFG_CIR_ENA : 0) |
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ANA_POL_MODE_CFG_OVERSHOOT_ENA);
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ocelot_write_gix(ocelot, value, ANA_POL_MODE_CFG, pol_ix);
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ocelot_write_gix(ocelot,
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ANA_POL_PIR_CFG_PIR_RATE(pir) |
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ANA_POL_PIR_CFG_PIR_BURST(pbs),
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ANA_POL_PIR_CFG, pol_ix);
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ocelot_write_gix(ocelot,
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(pir_discard ? GENMASK(22, 0) : 0),
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ANA_POL_PIR_STATE, pol_ix);
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ocelot_write_gix(ocelot,
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ANA_POL_CIR_CFG_CIR_RATE(cir) |
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ANA_POL_CIR_CFG_CIR_BURST(cbs),
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ANA_POL_CIR_CFG, pol_ix);
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ocelot_write_gix(ocelot,
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(cir_discard ? GENMASK(22, 0) : 0),
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ANA_POL_CIR_STATE, pol_ix);
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return 0;
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}
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int ocelot_port_policer_add(struct ocelot *ocelot, int port,
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struct ocelot_policer *pol)
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{
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struct qos_policer_conf pp = { 0 };
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int err;
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if (!pol)
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return -EINVAL;
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pp.mode = MSCC_QOS_RATE_MODE_DATA;
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pp.pir = pol->rate;
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pp.pbs = pol->burst;
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dev_dbg(ocelot->dev, "%s: port %u pir %u kbps, pbs %u bytes\n",
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__func__, port, pp.pir, pp.pbs);
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err = qos_policer_conf_set(ocelot, port, POL_IX_PORT + port, &pp);
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if (err)
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return err;
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ocelot_rmw_gix(ocelot,
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ANA_PORT_POL_CFG_PORT_POL_ENA |
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ANA_PORT_POL_CFG_POL_ORDER(POL_ORDER),
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ANA_PORT_POL_CFG_PORT_POL_ENA |
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ANA_PORT_POL_CFG_POL_ORDER_M,
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ANA_PORT_POL_CFG, port);
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return 0;
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}
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EXPORT_SYMBOL(ocelot_port_policer_add);
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int ocelot_port_policer_del(struct ocelot *ocelot, int port)
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{
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struct qos_policer_conf pp = { 0 };
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int err;
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dev_dbg(ocelot->dev, "%s: port %u\n", __func__, port);
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pp.mode = MSCC_QOS_RATE_MODE_DISABLED;
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err = qos_policer_conf_set(ocelot, port, POL_IX_PORT + port, &pp);
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if (err)
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return err;
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ocelot_rmw_gix(ocelot,
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ANA_PORT_POL_CFG_POL_ORDER(POL_ORDER),
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ANA_PORT_POL_CFG_PORT_POL_ENA |
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ANA_PORT_POL_CFG_POL_ORDER_M,
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ANA_PORT_POL_CFG, port);
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return 0;
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}
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EXPORT_SYMBOL(ocelot_port_policer_del);
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