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Date: Wed, 18 Nov 2009 12:15:22 -0700
From: Troy Kisky <troy.kisky@...ndarydevices.com>
To: Sriramakrishnan <srk@...com>
CC: netdev@...r.kernel.org,
davinci-linux-open-source@...ux.davincidsp.com
Subject: Re: [PATCH 3/3] TI Davinci EMAC : Abstract Buffer address translation
logic.
Sriramakrishnan wrote:
> When programming the DMA engine, the next pointers must be
> programmed with physical address as seen from the DMA master
> address space. This address may be different from physical
> address of the buffer RAM area. This patch abstracts the
> buffer address translation logic.
>
> Signed-off-by: Sriramakrishnan <srk@...com>
> Acked-by: Chaithrika U S <chaithrika@...com>
> ---
> drivers/net/davinci_emac.c | 41 ++++++++++++++++++++++++-----------------
> include/linux/davinci_emac.h | 1 +
> 2 files changed, 25 insertions(+), 17 deletions(-)
>
> diff --git a/drivers/net/davinci_emac.c b/drivers/net/davinci_emac.c
> index 81931f8..d4e173b 100644
> --- a/drivers/net/davinci_emac.c
> +++ b/drivers/net/davinci_emac.c
> @@ -464,6 +464,7 @@ struct emac_priv {
> void __iomem *ctrl_base;
> void __iomem *emac_ctrl_ram;
> u32 ctrl_ram_size;
> + u32 hw_ram_addr;
> struct emac_txch *txch[EMAC_DEF_MAX_TX_CH];
> struct emac_rxch *rxch[EMAC_DEF_MAX_RX_CH];
> u32 link; /* 1=link on, 0=link off */
> @@ -497,11 +498,9 @@ static struct clk *emac_clk;
> static unsigned long emac_bus_frequency;
> static unsigned long mdio_max_freq;
>
> -/* EMAC internal utility function */
> -static inline u32 emac_virt_to_phys(void __iomem *addr)
> -{
> - return (u32 __force) io_v2p(addr);
> -}
> +#define emac_virt_to_phys(addr, priv) \
> + (((u32 __force)(addr) - (u32 __force)(priv->emac_ctrl_ram)) \
> + + priv->hw_ram_addr)
Maybe instead of hw_ram_addr, you could use virtual_to_phys_translation
where virtual_to_phys_translation = your hw_ram_addr - emac_ctrl_ram
I'm fine with your way too though.
>
> /* Cache macros - Packet buffers would be from skb pool which is cached */
> #define EMAC_VIRT_NOCACHE(addr) (addr)
> @@ -1309,7 +1308,7 @@ static int emac_tx_bdproc(struct emac_priv *priv, u32 ch, u32 budget)
> curr_bd = txch->active_queue_head;
> if (NULL == curr_bd) {
> emac_write(EMAC_TXCP(ch),
> - emac_virt_to_phys(txch->last_hw_bdprocessed));
> + emac_virt_to_phys(txch->last_hw_bdprocessed, priv));
> txch->no_active_pkts++;
> spin_unlock_irqrestore(&priv->tx_lock, flags);
> return 0;
> @@ -1319,7 +1318,7 @@ static int emac_tx_bdproc(struct emac_priv *priv, u32 ch, u32 budget)
> while ((curr_bd) &&
> ((frame_status & EMAC_CPPI_OWNERSHIP_BIT) == 0) &&
> (pkts_processed < budget)) {
> - emac_write(EMAC_TXCP(ch), emac_virt_to_phys(curr_bd));
> + emac_write(EMAC_TXCP(ch), emac_virt_to_phys(curr_bd, priv));
> txch->active_queue_head = curr_bd->next;
> if (frame_status & EMAC_CPPI_EOQ_BIT) {
> if (curr_bd->next) { /* misqueued packet */
> @@ -1406,7 +1405,7 @@ static int emac_send(struct emac_priv *priv, struct emac_netpktobj *pkt, u32 ch)
> txch->active_queue_tail = curr_bd;
> if (1 != txch->queue_active) {
> emac_write(EMAC_TXHDP(ch),
> - emac_virt_to_phys(curr_bd));
> + emac_virt_to_phys(curr_bd, priv));
> txch->queue_active = 1;
> }
> ++txch->queue_reinit;
> @@ -1418,10 +1417,11 @@ static int emac_send(struct emac_priv *priv, struct emac_netpktobj *pkt, u32 ch)
> tail_bd->next = curr_bd;
> txch->active_queue_tail = curr_bd;
> tail_bd = EMAC_VIRT_NOCACHE(tail_bd);
> - tail_bd->h_next = (int)emac_virt_to_phys(curr_bd);
> + tail_bd->h_next = (int)emac_virt_to_phys(curr_bd, priv);
> frame_status = tail_bd->mode;
> if (frame_status & EMAC_CPPI_EOQ_BIT) {
> - emac_write(EMAC_TXHDP(ch), emac_virt_to_phys(curr_bd));
> + emac_write(EMAC_TXHDP(ch),
> + emac_virt_to_phys(curr_bd, priv));
> frame_status &= ~(EMAC_CPPI_EOQ_BIT);
> tail_bd->mode = frame_status;
> ++txch->end_of_queue_add;
> @@ -1611,7 +1611,8 @@ static int emac_init_rxch(struct emac_priv *priv, u32 ch, char *param)
> }
>
> /* populate the hardware descriptor */
> - curr_bd->h_next = emac_virt_to_phys(rxch->active_queue_head);
> + curr_bd->h_next = emac_virt_to_phys(rxch->active_queue_head,
> + priv);
> /* FIXME buff_ptr = dma_map_single(... data_ptr ...) */
> curr_bd->buff_ptr = virt_to_phys(curr_bd->data_ptr);
> curr_bd->off_b_len = rxch->buf_size;
> @@ -1886,7 +1887,7 @@ static void emac_addbd_to_rx_queue(struct emac_priv *priv, u32 ch,
> rxch->active_queue_tail = curr_bd;
> if (0 != rxch->queue_active) {
> emac_write(EMAC_RXHDP(ch),
> - emac_virt_to_phys(rxch->active_queue_head));
> + emac_virt_to_phys(rxch->active_queue_head, priv));
> rxch->queue_active = 1;
> }
> } else {
> @@ -1897,11 +1898,11 @@ static void emac_addbd_to_rx_queue(struct emac_priv *priv, u32 ch,
> rxch->active_queue_tail = curr_bd;
> tail_bd->next = curr_bd;
> tail_bd = EMAC_VIRT_NOCACHE(tail_bd);
> - tail_bd->h_next = emac_virt_to_phys(curr_bd);
> + tail_bd->h_next = emac_virt_to_phys(curr_bd, priv);
> frame_status = tail_bd->mode;
> if (frame_status & EMAC_CPPI_EOQ_BIT) {
> emac_write(EMAC_RXHDP(ch),
> - emac_virt_to_phys(curr_bd));
> + emac_virt_to_phys(curr_bd, priv));
> frame_status &= ~(EMAC_CPPI_EOQ_BIT);
> tail_bd->mode = frame_status;
> ++rxch->end_of_queue_add;
> @@ -1994,7 +1995,7 @@ static int emac_rx_bdproc(struct emac_priv *priv, u32 ch, u32 budget)
> curr_pkt->num_bufs = 1;
> curr_pkt->pkt_length =
> (frame_status & EMAC_RX_BD_PKT_LENGTH_MASK);
> - emac_write(EMAC_RXCP(ch), emac_virt_to_phys(curr_bd));
> + emac_write(EMAC_RXCP(ch), emac_virt_to_phys(curr_bd, priv));
> ++rxch->processed_bd;
> last_bd = curr_bd;
> curr_bd = last_bd->next;
> @@ -2005,7 +2006,7 @@ static int emac_rx_bdproc(struct emac_priv *priv, u32 ch, u32 budget)
> if (curr_bd) {
> ++rxch->mis_queued_packets;
> emac_write(EMAC_RXHDP(ch),
> - emac_virt_to_phys(curr_bd));
> + emac_virt_to_phys(curr_bd, priv));
> } else {
> ++rxch->end_of_queue;
> rxch->queue_active = 0;
> @@ -2106,7 +2107,7 @@ static int emac_hw_enable(struct emac_priv *priv)
> emac_write(EMAC_RXINTMASKSET, BIT(ch));
> rxch->queue_active = 1;
> emac_write(EMAC_RXHDP(ch),
> - emac_virt_to_phys(rxch->active_queue_head));
> + emac_virt_to_phys(rxch->active_queue_head, priv));
> }
>
> /* Enable MII */
> @@ -2705,6 +2706,12 @@ static int __devinit davinci_emac_probe(struct platform_device *pdev)
> priv->ctrl_ram_size = pdata->ctrl_ram_size;
> priv->emac_ctrl_ram = priv->remap_addr + pdata->ctrl_ram_offset;
>
> + if (pdata->hw_ram_addr)
> + priv->hw_ram_addr = pdata->hw_ram_addr;
> + else
> + priv->hw_ram_addr = (u32 __force)res->start +
> + pdata->ctrl_ram_offset;
> +
> res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
> if (!res) {
> dev_err(emac_dev, "DaVinci EMAC: Error getting irq res\n");
> diff --git a/include/linux/davinci_emac.h b/include/linux/davinci_emac.h
> index eb24dc0..b318dfd 100644
> --- a/include/linux/davinci_emac.h
> +++ b/include/linux/davinci_emac.h
> @@ -19,6 +19,7 @@ struct emac_platform_data {
> u32 ctrl_reg_offset;
> u32 ctrl_mod_reg_offset;
> u32 ctrl_ram_offset;
> + u32 hw_ram_addr;
> u32 mdio_reg_offset;
> u32 ctrl_ram_size;
> u32 phy_mask;
--
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