stmmac: rename the gmac as dwmac1000 and split core and dma parts

Use dwmac1000 naming instead of gmac.
The patch also splits the gmac.c file in two new ones:
dwmac1000_core.c and dwmac1000_dma.c.
This could actually help on some architectures where different
DMA engines are used.

Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 474 insertions, 0 deletions

diff --git a/drivers/net/stmmac/dwmac1000_dma.c b/drivers/net/stmmac/dwmac1000_dma.c
new file mode 100644
index 000000000000..68245508e2de
--- /dev/null
+++ b/drivers/net/stmmac/dwmac1000_dma.c
@@ -0,0 +1,474 @@
+/*******************************************************************************
+  This is the driver for the GMAC on-chip Ethernet controller for ST SoCs.
+  DWC Ether MAC 10/100/1000 Universal version 3.41a  has been used for
+  developing this code.
+
+  This contains the functions to handle the dma and descriptors.
+
+  Copyright (C) 2007-2009  STMicroelectronics Ltd
+
+  This program is free software; you can redistribute it and/or modify it
+  under the terms and conditions of the GNU General Public License,
+  version 2, as published by the Free Software Foundation.
+
+  This program is distributed in the hope it will be useful, but WITHOUT
+  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+  more details.
+
+  You should have received a copy of the GNU General Public License along with
+  this program; if not, write to the Free Software Foundation, Inc.,
+  51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+
+  The full GNU General Public License is included in this distribution in
+  the file called "COPYING".
+
+  Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
+*******************************************************************************/
+
+#include "dwmac1000.h"
+#include "dwmac_dma.h"
+
+static int dwmac1000_dma_init(unsigned long ioaddr, int pbl, u32 dma_tx,
+			      u32 dma_rx)
+{
+	u32 value = readl(ioaddr + DMA_BUS_MODE);
+	/* DMA SW reset */
+	value |= DMA_BUS_MODE_SFT_RESET;
+	writel(value, ioaddr + DMA_BUS_MODE);
+	do {} while ((readl(ioaddr + DMA_BUS_MODE) & DMA_BUS_MODE_SFT_RESET));
+
+	value = /* DMA_BUS_MODE_FB | */ DMA_BUS_MODE_4PBL |
+	    ((pbl << DMA_BUS_MODE_PBL_SHIFT) |
+	     (pbl << DMA_BUS_MODE_RPBL_SHIFT));
+
+#ifdef CONFIG_STMMAC_DA
+	value |= DMA_BUS_MODE_DA;	/* Rx has priority over tx */
+#endif
+	writel(value, ioaddr + DMA_BUS_MODE);
+
+	/* Mask interrupts by writing to CSR7 */
+	writel(DMA_INTR_DEFAULT_MASK, ioaddr + DMA_INTR_ENA);
+
+	/* The base address of the RX/TX descriptor lists must be written into
+	 * DMA CSR3 and CSR4, respectively. */
+	writel(dma_tx, ioaddr + DMA_TX_BASE_ADDR);
+	writel(dma_rx, ioaddr + DMA_RCV_BASE_ADDR);
+
+	return 0;
+}
+
+/* Transmit FIFO flush operation */
+static void dwmac1000_flush_tx_fifo(unsigned long ioaddr)
+{
+	u32 csr6 = readl(ioaddr + DMA_CONTROL);
+	writel((csr6 | DMA_CONTROL_FTF), ioaddr + DMA_CONTROL);
+
+	do {} while ((readl(ioaddr + DMA_CONTROL) & DMA_CONTROL_FTF));
+}
+
+static void dwmac1000_dma_operation_mode(unsigned long ioaddr, int txmode,
+				    int rxmode)
+{
+	u32 csr6 = readl(ioaddr + DMA_CONTROL);
+
+	if (txmode == SF_DMA_MODE) {
+		DBG(KERN_DEBUG "GMAC: enabling TX store and forward mode\n");
+		/* Transmit COE type 2 cannot be done in cut-through mode. */
+		csr6 |= DMA_CONTROL_TSF;
+		/* Operating on second frame increase the performance
+		 * especially when transmit store-and-forward is used.*/
+		csr6 |= DMA_CONTROL_OSF;
+	} else {
+		DBG(KERN_DEBUG "GMAC: disabling TX store and forward mode"
+			      " (threshold = %d)\n", txmode);
+		csr6 &= ~DMA_CONTROL_TSF;
+		csr6 &= DMA_CONTROL_TC_TX_MASK;
+		/* Set the transmit threshold */
+		if (txmode <= 32)
+			csr6 |= DMA_CONTROL_TTC_32;
+		else if (txmode <= 64)
+			csr6 |= DMA_CONTROL_TTC_64;
+		else if (txmode <= 128)
+			csr6 |= DMA_CONTROL_TTC_128;
+		else if (txmode <= 192)
+			csr6 |= DMA_CONTROL_TTC_192;
+		else
+			csr6 |= DMA_CONTROL_TTC_256;
+	}
+
+	if (rxmode == SF_DMA_MODE) {
+		DBG(KERN_DEBUG "GMAC: enabling RX store and forward mode\n");
+		csr6 |= DMA_CONTROL_RSF;
+	} else {
+		DBG(KERN_DEBUG "GMAC: disabling RX store and forward mode"
+			      " (threshold = %d)\n", rxmode);
+		csr6 &= ~DMA_CONTROL_RSF;
+		csr6 &= DMA_CONTROL_TC_RX_MASK;
+		if (rxmode <= 32)
+			csr6 |= DMA_CONTROL_RTC_32;
+		else if (rxmode <= 64)
+			csr6 |= DMA_CONTROL_RTC_64;
+		else if (rxmode <= 96)
+			csr6 |= DMA_CONTROL_RTC_96;
+		else
+			csr6 |= DMA_CONTROL_RTC_128;
+	}
+
+	writel(csr6, ioaddr + DMA_CONTROL);
+	return;
+}
+
+/* Not yet implemented --- no RMON module */
+static void dwmac1000_dma_diagnostic_fr(void *data,
+		  struct stmmac_extra_stats *x, unsigned long ioaddr)
+{
+	return;
+}
+
+static void dwmac1000_dump_dma_regs(unsigned long ioaddr)
+{
+	int i;
+	pr_info(" DMA registers\n");
+	for (i = 0; i < 22; i++) {
+		if ((i < 9) || (i > 17)) {
+			int offset = i * 4;
+			pr_err("\t Reg No. %d (offset 0x%x): 0x%08x\n", i,
+			       (DMA_BUS_MODE + offset),
+			       readl(ioaddr + DMA_BUS_MODE + offset));
+		}
+	}
+	return;
+}
+
+static int dwmac1000_get_tx_frame_status(void *data,
+				struct stmmac_extra_stats *x,
+				struct dma_desc *p, unsigned long ioaddr)
+{
+	int ret = 0;
+	struct net_device_stats *stats = (struct net_device_stats *)data;
+
+	if (unlikely(p->des01.etx.error_summary)) {
+		DBG(KERN_ERR "GMAC TX error... 0x%08x\n", p->des01.etx);
+		if (unlikely(p->des01.etx.jabber_timeout)) {
+			DBG(KERN_ERR "\tjabber_timeout error\n");
+			x->tx_jabber++;
+		}
+
+		if (unlikely(p->des01.etx.frame_flushed)) {
+			DBG(KERN_ERR "\tframe_flushed error\n");
+			x->tx_frame_flushed++;
+			dwmac1000_flush_tx_fifo(ioaddr);
+		}
+
+		if (unlikely(p->des01.etx.loss_carrier)) {
+			DBG(KERN_ERR "\tloss_carrier error\n");
+			x->tx_losscarrier++;
+			stats->tx_carrier_errors++;
+		}
+		if (unlikely(p->des01.etx.no_carrier)) {
+			DBG(KERN_ERR "\tno_carrier error\n");
+			x->tx_carrier++;
+			stats->tx_carrier_errors++;
+		}
+		if (unlikely(p->des01.etx.late_collision)) {
+			DBG(KERN_ERR "\tlate_collision error\n");
+			stats->collisions += p->des01.etx.collision_count;
+		}
+		if (unlikely(p->des01.etx.excessive_collisions)) {
+			DBG(KERN_ERR "\texcessive_collisions\n");
+			stats->collisions += p->des01.etx.collision_count;
+		}
+		if (unlikely(p->des01.etx.excessive_deferral)) {
+			DBG(KERN_INFO "\texcessive tx_deferral\n");
+			x->tx_deferred++;
+		}
+
+		if (unlikely(p->des01.etx.underflow_error)) {
+			DBG(KERN_ERR "\tunderflow error\n");
+			dwmac1000_flush_tx_fifo(ioaddr);
+			x->tx_underflow++;
+		}
+
+		if (unlikely(p->des01.etx.ip_header_error)) {
+			DBG(KERN_ERR "\tTX IP header csum error\n");
+			x->tx_ip_header_error++;
+		}
+
+		if (unlikely(p->des01.etx.payload_error)) {
+			DBG(KERN_ERR "\tAddr/Payload csum error\n");
+			x->tx_payload_error++;
+			dwmac1000_flush_tx_fifo(ioaddr);
+		}
+
+		ret = -1;
+	}
+
+	if (unlikely(p->des01.etx.deferred)) {
+		DBG(KERN_INFO "GMAC TX status: tx deferred\n");
+		x->tx_deferred++;
+	}
+#ifdef STMMAC_VLAN_TAG_USED
+	if (p->des01.etx.vlan_frame) {
+		DBG(KERN_INFO "GMAC TX status: VLAN frame\n");
+		x->tx_vlan++;
+	}
+#endif
+
+	return ret;
+}
+
+static int dwmac1000_get_tx_len(struct dma_desc *p)
+{
+	return p->des01.etx.buffer1_size;
+}
+
+static int dwmac1000_coe_rdes0(int ipc_err, int type, int payload_err)
+{
+	int ret = good_frame;
+	u32 status = (type << 2 | ipc_err << 1 | payload_err) & 0x7;
+
+	/* bits 5 7 0 | Frame status
+	 * ----------------------------------------------------------
+	 *      0 0 0 | IEEE 802.3 Type frame (lenght < 1536 octects)
+	 *      1 0 0 | IPv4/6 No CSUM errorS.
+	 *      1 0 1 | IPv4/6 CSUM PAYLOAD error
+	 *      1 1 0 | IPv4/6 CSUM IP HR error
+	 *      1 1 1 | IPv4/6 IP PAYLOAD AND HEADER errorS
+	 *      0 0 1 | IPv4/6 unsupported IP PAYLOAD
+	 *      0 1 1 | COE bypassed.. no IPv4/6 frame
+	 *      0 1 0 | Reserved.
+	 */
+	if (status == 0x0) {
+		DBG(KERN_INFO "RX Des0 status: IEEE 802.3 Type frame.\n");
+		ret = good_frame;
+	} else if (status == 0x4) {
+		DBG(KERN_INFO "RX Des0 status: IPv4/6 No CSUM errorS.\n");
+		ret = good_frame;
+	} else if (status == 0x5) {
+		DBG(KERN_ERR "RX Des0 status: IPv4/6 Payload Error.\n");
+		ret = csum_none;
+	} else if (status == 0x6) {
+		DBG(KERN_ERR "RX Des0 status: IPv4/6 Header Error.\n");
+		ret = csum_none;
+	} else if (status == 0x7) {
+		DBG(KERN_ERR
+		    "RX Des0 status: IPv4/6 Header and Payload Error.\n");
+		ret = csum_none;
+	} else if (status == 0x1) {
+		DBG(KERN_ERR
+		    "RX Des0 status: IPv4/6 unsupported IP PAYLOAD.\n");
+		ret = discard_frame;
+	} else if (status == 0x3) {
+		DBG(KERN_ERR "RX Des0 status: No IPv4, IPv6 frame.\n");
+		ret = discard_frame;
+	}
+	return ret;
+}
+
+static int dwmac1000_get_rx_frame_status(void *data,
+			struct stmmac_extra_stats *x, struct dma_desc *p)
+{
+	int ret = good_frame;
+	struct net_device_stats *stats = (struct net_device_stats *)data;
+
+	if (unlikely(p->des01.erx.error_summary)) {
+		DBG(KERN_ERR "GMAC RX Error Summary... 0x%08x\n", p->des01.erx);
+		if (unlikely(p->des01.erx.descriptor_error)) {
+			DBG(KERN_ERR "\tdescriptor error\n");
+			x->rx_desc++;
+			stats->rx_length_errors++;
+		}
+		if (unlikely(p->des01.erx.overflow_error)) {
+			DBG(KERN_ERR "\toverflow error\n");
+			x->rx_gmac_overflow++;
+		}
+
+		if (unlikely(p->des01.erx.ipc_csum_error))
+			DBG(KERN_ERR "\tIPC Csum Error/Giant frame\n");
+
+		if (unlikely(p->des01.erx.late_collision)) {
+			DBG(KERN_ERR "\tlate_collision error\n");
+			stats->collisions++;
+			stats->collisions++;
+		}
+		if (unlikely(p->des01.erx.receive_watchdog)) {
+			DBG(KERN_ERR "\treceive_watchdog error\n");
+			x->rx_watchdog++;
+		}
+		if (unlikely(p->des01.erx.error_gmii)) {
+			DBG(KERN_ERR "\tReceive Error\n");
+			x->rx_mii++;
+		}
+		if (unlikely(p->des01.erx.crc_error)) {
+			DBG(KERN_ERR "\tCRC error\n");
+			x->rx_crc++;
+			stats->rx_crc_errors++;
+		}
+		ret = discard_frame;
+	}
+
+	/* After a payload csum error, the ES bit is set.
+	 * It doesn't match with the information reported into the databook.
+	 * At any rate, we need to understand if the CSUM hw computation is ok
+	 * and report this info to the upper layers. */
+	ret = dwmac1000_coe_rdes0(p->des01.erx.ipc_csum_error,
+		p->des01.erx.frame_type, p->des01.erx.payload_csum_error);
+
+	if (unlikely(p->des01.erx.dribbling)) {
+		DBG(KERN_ERR "GMAC RX: dribbling error\n");
+		ret = discard_frame;
+	}
+	if (unlikely(p->des01.erx.sa_filter_fail)) {
+		DBG(KERN_ERR "GMAC RX : Source Address filter fail\n");
+		x->sa_rx_filter_fail++;
+		ret = discard_frame;
+	}
+	if (unlikely(p->des01.erx.da_filter_fail)) {
+		DBG(KERN_ERR "GMAC RX : Destination Address filter fail\n");
+		x->da_rx_filter_fail++;
+		ret = discard_frame;
+	}
+	if (unlikely(p->des01.erx.length_error)) {
+		DBG(KERN_ERR "GMAC RX: length_error error\n");
+		x->rx_lenght++;
+		ret = discard_frame;
+	}
+#ifdef STMMAC_VLAN_TAG_USED
+	if (p->des01.erx.vlan_tag) {
+		DBG(KERN_INFO "GMAC RX: VLAN frame tagged\n");
+		x->rx_vlan++;
+	}
+#endif
+	return ret;
+}
+
+static void dwmac1000_init_rx_desc(struct dma_desc *p, unsigned int ring_size,
+				int disable_rx_ic)
+{
+	int i;
+	for (i = 0; i < ring_size; i++) {
+		p->des01.erx.own = 1;
+		p->des01.erx.buffer1_size = BUF_SIZE_8KiB - 1;
+		/* To support jumbo frames */
+		p->des01.erx.buffer2_size = BUF_SIZE_8KiB - 1;
+		if (i == ring_size - 1)
+			p->des01.erx.end_ring = 1;
+		if (disable_rx_ic)
+			p->des01.erx.disable_ic = 1;
+		p++;
+	}
+	return;
+}
+
+static void dwmac1000_init_tx_desc(struct dma_desc *p, unsigned int ring_size)
+{
+	int i;
+
+	for (i = 0; i < ring_size; i++) {
+		p->des01.etx.own = 0;
+		if (i == ring_size - 1)
+			p->des01.etx.end_ring = 1;
+		p++;
+	}
+
+	return;
+}
+
+static int dwmac1000_get_tx_owner(struct dma_desc *p)
+{
+	return p->des01.etx.own;
+}
+
+static int dwmac1000_get_rx_owner(struct dma_desc *p)
+{
+	return p->des01.erx.own;
+}
+
+static void dwmac1000_set_tx_owner(struct dma_desc *p)
+{
+	p->des01.etx.own = 1;
+}
+
+static void dwmac1000_set_rx_owner(struct dma_desc *p)
+{
+	p->des01.erx.own = 1;
+}
+
+static int dwmac1000_get_tx_ls(struct dma_desc *p)
+{
+	return p->des01.etx.last_segment;
+}
+
+static void dwmac1000_release_tx_desc(struct dma_desc *p)
+{
+	int ter = p->des01.etx.end_ring;
+
+	memset(p, 0, sizeof(struct dma_desc));
+	p->des01.etx.end_ring = ter;
+
+	return;
+}
+
+static void dwmac1000_prepare_tx_desc(struct dma_desc *p, int is_fs, int len,
+				 int csum_flag)
+{
+	p->des01.etx.first_segment = is_fs;
+	if (unlikely(len > BUF_SIZE_4KiB)) {
+		p->des01.etx.buffer1_size = BUF_SIZE_4KiB;
+		p->des01.etx.buffer2_size = len - BUF_SIZE_4KiB;
+	} else {
+		p->des01.etx.buffer1_size = len;
+	}
+	if (likely(csum_flag))
+		p->des01.etx.checksum_insertion = cic_full;
+}
+
+static void dwmac1000_clear_tx_ic(struct dma_desc *p)
+{
+	p->des01.etx.interrupt = 0;
+}
+
+static void dwmac1000_close_tx_desc(struct dma_desc *p)
+{
+	p->des01.etx.last_segment = 1;
+	p->des01.etx.interrupt = 1;
+}
+
+static int dwmac1000_get_rx_frame_len(struct dma_desc *p)
+{
+	return p->des01.erx.frame_length;
+}
+
+struct stmmac_dma_ops dwmac1000_dma_ops = {
+	.init = dwmac1000_dma_init,
+	.dump_regs = dwmac1000_dump_dma_regs,
+	.dma_mode = dwmac1000_dma_operation_mode,
+	.dma_diagnostic_fr = dwmac1000_dma_diagnostic_fr,
+	.enable_dma_transmission = dwmac_enable_dma_transmission,
+	.enable_dma_irq = dwmac_enable_dma_irq,
+	.disable_dma_irq = dwmac_disable_dma_irq,
+	.start_tx = dwmac_dma_start_tx,
+	.stop_tx = dwmac_dma_stop_tx,
+	.start_rx = dwmac_dma_start_rx,
+	.stop_rx = dwmac_dma_stop_rx,
+	.dma_interrupt = dwmac_dma_interrupt,
+};
+
+struct stmmac_desc_ops dwmac1000_desc_ops = {
+	.tx_status = dwmac1000_get_tx_frame_status,
+	.rx_status = dwmac1000_get_rx_frame_status,
+	.get_tx_len = dwmac1000_get_tx_len,
+	.init_rx_desc = dwmac1000_init_rx_desc,
+	.init_tx_desc = dwmac1000_init_tx_desc,
+	.get_tx_owner = dwmac1000_get_tx_owner,
+	.get_rx_owner = dwmac1000_get_rx_owner,
+	.release_tx_desc = dwmac1000_release_tx_desc,
+	.prepare_tx_desc = dwmac1000_prepare_tx_desc,
+	.clear_tx_ic = dwmac1000_clear_tx_ic,
+	.close_tx_desc = dwmac1000_close_tx_desc,
+	.get_tx_ls = dwmac1000_get_tx_ls,
+	.set_tx_owner = dwmac1000_set_tx_owner,
+	.set_rx_owner = dwmac1000_set_rx_owner,
+	.get_rx_frame_len = dwmac1000_get_rx_frame_len,
+};