diff --git a/drivers/net/ethernet/ti/davinci_cpdma.c b/drivers/net/ethernet/ti/davinci_cpdma.c index 87456a937732bdf3cef1d9d54abe96ea474e52d2..c776e4575d2da2d6d0b0cf584798c08ef705dd34 100644 --- a/drivers/net/ethernet/ti/davinci_cpdma.c +++ b/drivers/net/ethernet/ti/davinci_cpdma.c @@ -32,6 +32,7 @@ #define CPDMA_RXCONTROL 0x14 #define CPDMA_SOFTRESET 0x1c #define CPDMA_RXTEARDOWN 0x18 +#define CPDMA_TX_PRI0_RATE 0x30 #define CPDMA_TXINTSTATRAW 0x80 #define CPDMA_TXINTSTATMASKED 0x84 #define CPDMA_TXINTMASKSET 0x88 @@ -68,6 +69,8 @@ #define CPDMA_TEARDOWN_VALUE 0xfffffffc +#define CPDMA_MAX_RLIM_CNT 16384 + struct cpdma_desc { /* hardware fields */ u32 hw_next; @@ -123,6 +126,8 @@ struct cpdma_chan { /* offsets into dmaregs */ int int_set, int_clear, td; int weight; + u32 rate_factor; + u32 rate; }; struct cpdma_control_info { @@ -135,6 +140,7 @@ struct cpdma_control_info { }; static struct cpdma_control_info controls[] = { + [CPDMA_TX_RLIM] = {CPDMA_DMACONTROL, 8, 0xffff, ACCESS_RW}, [CPDMA_CMD_IDLE] = {CPDMA_DMACONTROL, 3, 1, ACCESS_WO}, [CPDMA_COPY_ERROR_FRAMES] = {CPDMA_DMACONTROL, 4, 1, ACCESS_RW}, [CPDMA_RX_OFF_LEN_UPDATE] = {CPDMA_DMACONTROL, 2, 1, ACCESS_RW}, @@ -302,6 +308,186 @@ static int _cpdma_control_set(struct cpdma_ctlr *ctlr, int control, int value) return 0; } +static int _cpdma_control_get(struct cpdma_ctlr *ctlr, int control) +{ + struct cpdma_control_info *info = &controls[control]; + int ret; + + if (!ctlr->params.has_ext_regs) + return -ENOTSUPP; + + if (ctlr->state != CPDMA_STATE_ACTIVE) + return -EINVAL; + + if (control < 0 || control >= ARRAY_SIZE(controls)) + return -ENOENT; + + if ((info->access & ACCESS_RO) != ACCESS_RO) + return -EPERM; + + ret = (dma_reg_read(ctlr, info->reg) >> info->shift) & info->mask; + return ret; +} + +/* cpdma_chan_set_chan_shaper - set shaper for a channel + * Has to be called under ctlr lock + */ +static int cpdma_chan_set_chan_shaper(struct cpdma_chan *chan) +{ + struct cpdma_ctlr *ctlr = chan->ctlr; + u32 rate_reg; + u32 rmask; + int ret; + + if (!chan->rate) + return 0; + + rate_reg = CPDMA_TX_PRI0_RATE + 4 * chan->chan_num; + dma_reg_write(ctlr, rate_reg, chan->rate_factor); + + rmask = _cpdma_control_get(ctlr, CPDMA_TX_RLIM); + rmask |= chan->mask; + + ret = _cpdma_control_set(ctlr, CPDMA_TX_RLIM, rmask); + return ret; +} + +static int cpdma_chan_on(struct cpdma_chan *chan) +{ + struct cpdma_ctlr *ctlr = chan->ctlr; + struct cpdma_desc_pool *pool = ctlr->pool; + unsigned long flags; + + spin_lock_irqsave(&chan->lock, flags); + if (chan->state != CPDMA_STATE_IDLE) { + spin_unlock_irqrestore(&chan->lock, flags); + return -EBUSY; + } + if (ctlr->state != CPDMA_STATE_ACTIVE) { + spin_unlock_irqrestore(&chan->lock, flags); + return -EINVAL; + } + dma_reg_write(ctlr, chan->int_set, chan->mask); + chan->state = CPDMA_STATE_ACTIVE; + if (chan->head) { + chan_write(chan, hdp, desc_phys(pool, chan->head)); + if (chan->rxfree) + chan_write(chan, rxfree, chan->count); + } + + spin_unlock_irqrestore(&chan->lock, flags); + return 0; +} + +/* cpdma_chan_fit_rate - set rate for a channel and check if it's possible. + * rmask - mask of rate limited channels + * Returns min rate in Kb/s + */ +static int cpdma_chan_fit_rate(struct cpdma_chan *ch, u32 rate, + u32 *rmask, int *prio_mode) +{ + struct cpdma_ctlr *ctlr = ch->ctlr; + struct cpdma_chan *chan; + u32 old_rate = ch->rate; + u32 new_rmask = 0; + int rlim = 1; + int i; + + *prio_mode = 0; + for (i = tx_chan_num(0); i < tx_chan_num(CPDMA_MAX_CHANNELS); i++) { + chan = ctlr->channels[i]; + if (!chan) { + rlim = 0; + continue; + } + + if (chan == ch) + chan->rate = rate; + + if (chan->rate) { + if (rlim) { + new_rmask |= chan->mask; + } else { + ch->rate = old_rate; + dev_err(ctlr->dev, "Prev channel of %dch is not rate limited\n", + chan->chan_num); + return -EINVAL; + } + } else { + *prio_mode = 1; + rlim = 0; + } + } + + *rmask = new_rmask; + return 0; +} + +static u32 cpdma_chan_set_factors(struct cpdma_ctlr *ctlr, + struct cpdma_chan *ch) +{ + u32 delta = UINT_MAX, prev_delta = UINT_MAX, best_delta = UINT_MAX; + u32 best_send_cnt = 0, best_idle_cnt = 0; + u32 new_rate, best_rate = 0, rate_reg; + u64 send_cnt, idle_cnt; + u32 min_send_cnt, freq; + u64 divident, divisor; + + if (!ch->rate) { + ch->rate_factor = 0; + goto set_factor; + } + + freq = ctlr->params.bus_freq_mhz * 1000 * 32; + if (!freq) { + dev_err(ctlr->dev, "The bus frequency is not set\n"); + return -EINVAL; + } + + min_send_cnt = freq - ch->rate; + send_cnt = DIV_ROUND_UP(min_send_cnt, ch->rate); + while (send_cnt <= CPDMA_MAX_RLIM_CNT) { + divident = ch->rate * send_cnt; + divisor = min_send_cnt; + idle_cnt = DIV_ROUND_CLOSEST_ULL(divident, divisor); + + divident = freq * idle_cnt; + divisor = idle_cnt + send_cnt; + new_rate = DIV_ROUND_CLOSEST_ULL(divident, divisor); + + delta = new_rate >= ch->rate ? new_rate - ch->rate : delta; + if (delta < best_delta) { + best_delta = delta; + best_send_cnt = send_cnt; + best_idle_cnt = idle_cnt; + best_rate = new_rate; + + if (!delta) + break; + } + + if (prev_delta >= delta) { + prev_delta = delta; + send_cnt++; + continue; + } + + idle_cnt++; + divident = freq * idle_cnt; + send_cnt = DIV_ROUND_CLOSEST_ULL(divident, ch->rate); + send_cnt -= idle_cnt; + prev_delta = UINT_MAX; + } + + ch->rate = best_rate; + ch->rate_factor = best_send_cnt | (best_idle_cnt << 16); + +set_factor: + rate_reg = CPDMA_TX_PRI0_RATE + 4 * ch->chan_num; + dma_reg_write(ctlr, rate_reg, ch->rate_factor); + return 0; +} + struct cpdma_ctlr *cpdma_ctlr_create(struct cpdma_params *params) { struct cpdma_ctlr *ctlr; @@ -332,8 +518,9 @@ EXPORT_SYMBOL_GPL(cpdma_ctlr_create); int cpdma_ctlr_start(struct cpdma_ctlr *ctlr) { + struct cpdma_chan *chan; unsigned long flags; - int i; + int i, prio_mode; spin_lock_irqsave(&ctlr->lock, flags); if (ctlr->state != CPDMA_STATE_IDLE) { @@ -369,12 +556,20 @@ int cpdma_ctlr_start(struct cpdma_ctlr *ctlr) ctlr->state = CPDMA_STATE_ACTIVE; + prio_mode = 0; for (i = 0; i < ARRAY_SIZE(ctlr->channels); i++) { - if (ctlr->channels[i]) - cpdma_chan_start(ctlr->channels[i]); + chan = ctlr->channels[i]; + if (chan) { + cpdma_chan_set_chan_shaper(chan); + cpdma_chan_on(chan); + + /* off prio mode if all tx channels are rate limited */ + if (is_tx_chan(chan) && !chan->rate) + prio_mode = 1; + } } - _cpdma_control_set(ctlr, CPDMA_TX_PRIO_FIXED, 1); + _cpdma_control_set(ctlr, CPDMA_TX_PRIO_FIXED, prio_mode); _cpdma_control_set(ctlr, CPDMA_RX_BUFFER_OFFSET, 0); spin_unlock_irqrestore(&ctlr->lock, flags); @@ -602,6 +797,75 @@ int cpdma_chan_set_weight(struct cpdma_chan *ch, int weight) return ret; } +/* cpdma_chan_get_min_rate - get minimum allowed rate for channel + * Should be called before cpdma_chan_set_rate. + * Returns min rate in Kb/s + */ +u32 cpdma_chan_get_min_rate(struct cpdma_ctlr *ctlr) +{ + unsigned int divident, divisor; + + divident = ctlr->params.bus_freq_mhz * 32 * 1000; + divisor = 1 + CPDMA_MAX_RLIM_CNT; + + return DIV_ROUND_UP(divident, divisor); +} + +/* cpdma_chan_set_rate - limits bandwidth for transmit channel. + * The bandwidth * limited channels have to be in order beginning from lowest. + * ch - transmit channel the bandwidth is configured for + * rate - bandwidth in Kb/s, if 0 - then off shaper + */ +int cpdma_chan_set_rate(struct cpdma_chan *ch, u32 rate) +{ + struct cpdma_ctlr *ctlr = ch->ctlr; + unsigned long flags, ch_flags; + int ret, prio_mode; + u32 rmask; + + if (!ch || !is_tx_chan(ch)) + return -EINVAL; + + if (ch->rate == rate) + return rate; + + spin_lock_irqsave(&ctlr->lock, flags); + spin_lock_irqsave(&ch->lock, ch_flags); + + ret = cpdma_chan_fit_rate(ch, rate, &rmask, &prio_mode); + if (ret) + goto err; + + ret = cpdma_chan_set_factors(ctlr, ch); + if (ret) + goto err; + + spin_unlock_irqrestore(&ch->lock, ch_flags); + + /* on shapers */ + _cpdma_control_set(ctlr, CPDMA_TX_RLIM, rmask); + _cpdma_control_set(ctlr, CPDMA_TX_PRIO_FIXED, prio_mode); + spin_unlock_irqrestore(&ctlr->lock, flags); + return ret; + +err: + spin_unlock_irqrestore(&ch->lock, ch_flags); + spin_unlock_irqrestore(&ctlr->lock, flags); + return ret; +} + +u32 cpdma_chan_get_rate(struct cpdma_chan *ch) +{ + unsigned long flags; + u32 rate; + + spin_lock_irqsave(&ch->lock, flags); + rate = ch->rate; + spin_unlock_irqrestore(&ch->lock, flags); + + return rate; +} + struct cpdma_chan *cpdma_chan_create(struct cpdma_ctlr *ctlr, int chan_num, cpdma_handler_fn handler, int rx_type) { @@ -629,6 +893,7 @@ struct cpdma_chan *cpdma_chan_create(struct cpdma_ctlr *ctlr, int chan_num, chan->state = CPDMA_STATE_IDLE; chan->chan_num = chan_num; chan->handler = handler; + chan->rate = 0; chan->desc_num = ctlr->pool->num_desc / 2; chan->weight = 0; @@ -924,28 +1189,20 @@ EXPORT_SYMBOL_GPL(cpdma_chan_process); int cpdma_chan_start(struct cpdma_chan *chan) { - struct cpdma_ctlr *ctlr = chan->ctlr; - struct cpdma_desc_pool *pool = ctlr->pool; - unsigned long flags; + struct cpdma_ctlr *ctlr = chan->ctlr; + unsigned long flags; + int ret; - spin_lock_irqsave(&chan->lock, flags); - if (chan->state != CPDMA_STATE_IDLE) { - spin_unlock_irqrestore(&chan->lock, flags); - return -EBUSY; - } - if (ctlr->state != CPDMA_STATE_ACTIVE) { - spin_unlock_irqrestore(&chan->lock, flags); - return -EINVAL; - } - dma_reg_write(ctlr, chan->int_set, chan->mask); - chan->state = CPDMA_STATE_ACTIVE; - if (chan->head) { - chan_write(chan, hdp, desc_phys(pool, chan->head)); - if (chan->rxfree) - chan_write(chan, rxfree, chan->count); - } + spin_lock_irqsave(&ctlr->lock, flags); + ret = cpdma_chan_set_chan_shaper(chan); + spin_unlock_irqrestore(&ctlr->lock, flags); + if (ret) + return ret; + + ret = cpdma_chan_on(chan); + if (ret) + return ret; - spin_unlock_irqrestore(&chan->lock, flags); return 0; } EXPORT_SYMBOL_GPL(cpdma_chan_start); @@ -1033,31 +1290,12 @@ int cpdma_chan_int_ctrl(struct cpdma_chan *chan, bool enable) int cpdma_control_get(struct cpdma_ctlr *ctlr, int control) { unsigned long flags; - struct cpdma_control_info *info = &controls[control]; int ret; spin_lock_irqsave(&ctlr->lock, flags); - - ret = -ENOTSUPP; - if (!ctlr->params.has_ext_regs) - goto unlock_ret; - - ret = -EINVAL; - if (ctlr->state != CPDMA_STATE_ACTIVE) - goto unlock_ret; - - ret = -ENOENT; - if (control < 0 || control >= ARRAY_SIZE(controls)) - goto unlock_ret; - - ret = -EPERM; - if ((info->access & ACCESS_RO) != ACCESS_RO) - goto unlock_ret; - - ret = (dma_reg_read(ctlr, info->reg) >> info->shift) & info->mask; - -unlock_ret: + ret = _cpdma_control_get(ctlr, control); spin_unlock_irqrestore(&ctlr->lock, flags); + return ret; } @@ -1069,6 +1307,7 @@ int cpdma_control_set(struct cpdma_ctlr *ctlr, int control, int value) spin_lock_irqsave(&ctlr->lock, flags); ret = _cpdma_control_set(ctlr, control, value); spin_unlock_irqrestore(&ctlr->lock, flags); + return ret; } EXPORT_SYMBOL_GPL(cpdma_control_set); diff --git a/drivers/net/ethernet/ti/davinci_cpdma.h b/drivers/net/ethernet/ti/davinci_cpdma.h index 629020cbc2057790fbb36802ffec72ee05c83286..4a167db2ababfed5adad4d9f8448dd78bc8971e8 100644 --- a/drivers/net/ethernet/ti/davinci_cpdma.h +++ b/drivers/net/ethernet/ti/davinci_cpdma.h @@ -36,6 +36,7 @@ struct cpdma_params { u32 desc_hw_addr; int desc_mem_size; int desc_align; + u32 bus_freq_mhz; /* * Some instances of embedded cpdma controllers have extra control and @@ -91,8 +92,12 @@ u32 cpdma_ctrl_rxchs_state(struct cpdma_ctlr *ctlr); u32 cpdma_ctrl_txchs_state(struct cpdma_ctlr *ctlr); bool cpdma_check_free_tx_desc(struct cpdma_chan *chan); int cpdma_chan_set_weight(struct cpdma_chan *ch, int weight); +int cpdma_chan_set_rate(struct cpdma_chan *ch, u32 rate); +u32 cpdma_chan_get_rate(struct cpdma_chan *ch); +u32 cpdma_chan_get_min_rate(struct cpdma_ctlr *ctlr); enum cpdma_control { + CPDMA_TX_RLIM, /* read-write */ CPDMA_CMD_IDLE, /* write-only */ CPDMA_COPY_ERROR_FRAMES, /* read-write */ CPDMA_RX_OFF_LEN_UPDATE, /* read-write */