[deliverable/linux.git] / drivers / net / stmmac / dwmac1000_dma.c

/*******************************************************************************
  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.

  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 <asm/io.h>
#include "dwmac1000.h"
#include "dwmac_dma.h"

static int dwmac1000_dma_init(void __iomem *ioaddr, int pbl, u32 dma_tx,
			      u32 dma_rx)
{
	u32 value = readl(ioaddr + DMA_BUS_MODE);
	int limit;

	/* DMA SW reset */
	value |= DMA_BUS_MODE_SFT_RESET;
	writel(value, ioaddr + DMA_BUS_MODE);
	limit = 15000;
	while (limit--) {
		if (!(readl(ioaddr + DMA_BUS_MODE) & DMA_BUS_MODE_SFT_RESET))
			break;
	}
	if (limit < 0)
		return -EBUSY;

	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;
}

static void dwmac1000_dma_operation_mode(void __iomem *ioaddr, int txmode,
				    int rxmode)
{
	u32 csr6 = readl(ioaddr + DMA_CONTROL);

	if (txmode == SF_DMA_MODE) {
		CHIP_DBG(KERN_DEBUG "GMAC: enable 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 {
		CHIP_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) {
		CHIP_DBG(KERN_DEBUG "GMAC: enable RX store and forward mode\n");
		csr6 |= DMA_CONTROL_RSF;
	} else {
		CHIP_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);
}

/* Not yet implemented --- no RMON module */
static void dwmac1000_dma_diagnostic_fr(void *data,
		  struct stmmac_extra_stats *x, void __iomem *ioaddr)
{
	return;
}

static void dwmac1000_dump_dma_regs(void __iomem *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));
		}
	}
}

const 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,
};
Commit	Line	Data
47dd7a54 GC	1	/*******************************************************************************
	2	This is the driver for the GMAC on-chip Ethernet controller for ST SoCs.
	3	DWC Ether MAC 10/100/1000 Universal version 3.41a has been used for
	4	developing this code.
	5
56b106ae	6	This contains the functions to handle the dma.
21d437cc	7
47dd7a54 GC	8	Copyright (C) 2007-2009 STMicroelectronics Ltd
	9
	10	This program is free software; you can redistribute it and/or modify it
	11	under the terms and conditions of the GNU General Public License,
	12	version 2, as published by the Free Software Foundation.
	13
	14	This program is distributed in the hope it will be useful, but WITHOUT
	15	ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	16	FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	17	more details.
	18
	19	You should have received a copy of the GNU General Public License along with
	20	this program; if not, write to the Free Software Foundation, Inc.,
	21	51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
	22
	23	The full GNU General Public License is included in this distribution in
	24	the file called "COPYING".
	25
	26	Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
	27	*******************************************************************************/
	28
b7f080cf	29	#include <asm/io.h>
21d437cc	30	#include "dwmac1000.h"
aec7ff27	31	#include "dwmac_dma.h"
47dd7a54	32
ad01b7d4	33	static int dwmac1000_dma_init(void __iomem *ioaddr, int pbl, u32 dma_tx,
21d437cc	34	u32 dma_rx)
47dd7a54 GC	35	{
47dd7a54 GC	36	u32 value = readl(ioaddr + DMA_BUS_MODE);
c629882a GC	37	int limit;
c629882a GC	38
47dd7a54 GC	39	/* DMA SW reset */
	40	value \|= DMA_BUS_MODE_SFT_RESET;
	41	writel(value, ioaddr + DMA_BUS_MODE);
c629882a GC	42	limit = 15000;
	43	while (limit--) {
	44	if (!(readl(ioaddr + DMA_BUS_MODE) & DMA_BUS_MODE_SFT_RESET))
	45	break;
	46	}
	47	if (limit < 0)
	48	return -EBUSY;
47dd7a54 GC	49
	50	value = /* DMA_BUS_MODE_FB \| */ DMA_BUS_MODE_4PBL \|
	51	((pbl << DMA_BUS_MODE_PBL_SHIFT) \|
	52	(pbl << DMA_BUS_MODE_RPBL_SHIFT));
	53
	54	#ifdef CONFIG_STMMAC_DA
	55	value \|= DMA_BUS_MODE_DA; /* Rx has priority over tx */
	56	#endif
	57	writel(value, ioaddr + DMA_BUS_MODE);
	58
	59	/* Mask interrupts by writing to CSR7 */
	60	writel(DMA_INTR_DEFAULT_MASK, ioaddr + DMA_INTR_ENA);
	61
	62	/* The base address of the RX/TX descriptor lists must be written into
	63	* DMA CSR3 and CSR4, respectively. */
	64	writel(dma_tx, ioaddr + DMA_TX_BASE_ADDR);
	65	writel(dma_rx, ioaddr + DMA_RCV_BASE_ADDR);
	66
	67	return 0;
	68	}
	69
ad01b7d4	70	static void dwmac1000_dma_operation_mode(void __iomem *ioaddr, int txmode,
47dd7a54 GC	71	int rxmode)
	72	{
	73	u32 csr6 = readl(ioaddr + DMA_CONTROL);
	74
	75	if (txmode == SF_DMA_MODE) {
56b106ae	76	CHIP_DBG(KERN_DEBUG "GMAC: enable TX store and forward mode\n");
47dd7a54 GC	77	/* Transmit COE type 2 cannot be done in cut-through mode. */
	78	csr6 \|= DMA_CONTROL_TSF;
	79	/* Operating on second frame increase the performance
	80	* especially when transmit store-and-forward is used.*/
	81	csr6 \|= DMA_CONTROL_OSF;
	82	} else {
56b106ae	83	CHIP_DBG(KERN_DEBUG "GMAC: disabling TX store and forward mode"
47dd7a54 GC	84	" (threshold = %d)\n", txmode);
	85	csr6 &= ~DMA_CONTROL_TSF;
	86	csr6 &= DMA_CONTROL_TC_TX_MASK;
af901ca1	87	/* Set the transmit threshold */
47dd7a54 GC	88	if (txmode <= 32)
	89	csr6 \|= DMA_CONTROL_TTC_32;
	90	else if (txmode <= 64)
	91	csr6 \|= DMA_CONTROL_TTC_64;
	92	else if (txmode <= 128)
	93	csr6 \|= DMA_CONTROL_TTC_128;
	94	else if (txmode <= 192)
	95	csr6 \|= DMA_CONTROL_TTC_192;
	96	else
	97	csr6 \|= DMA_CONTROL_TTC_256;
	98	}
	99
	100	if (rxmode == SF_DMA_MODE) {
56b106ae	101	CHIP_DBG(KERN_DEBUG "GMAC: enable RX store and forward mode\n");
47dd7a54 GC	102	csr6 \|= DMA_CONTROL_RSF;
47dd7a54 GC	103	} else {
56b106ae	104	CHIP_DBG(KERN_DEBUG "GMAC: disabling RX store and forward mode"
47dd7a54 GC	105	" (threshold = %d)\n", rxmode);
	106	csr6 &= ~DMA_CONTROL_RSF;
	107	csr6 &= DMA_CONTROL_TC_RX_MASK;
	108	if (rxmode <= 32)
	109	csr6 \|= DMA_CONTROL_RTC_32;
	110	else if (rxmode <= 64)
	111	csr6 \|= DMA_CONTROL_RTC_64;
	112	else if (rxmode <= 96)
	113	csr6 \|= DMA_CONTROL_RTC_96;
	114	else
	115	csr6 \|= DMA_CONTROL_RTC_128;
	116	}
	117
	118	writel(csr6, ioaddr + DMA_CONTROL);
47dd7a54 GC	119	}
	120
	121	/* Not yet implemented --- no RMON module */
21d437cc	122	static void dwmac1000_dma_diagnostic_fr(void *data,
ad01b7d4	123	struct stmmac_extra_stats x, void __iomem ioaddr)
47dd7a54 GC	124	{
	125	return;
	126	}
	127
ad01b7d4	128	static void dwmac1000_dump_dma_regs(void __iomem *ioaddr)
47dd7a54 GC	129	{
	130	int i;
	131	pr_info(" DMA registers\n");
	132	for (i = 0; i < 22; i++) {
	133	if ((i < 9) \|\| (i > 17)) {
	134	int offset = i * 4;
	135	pr_err("\t Reg No. %d (offset 0x%x): 0x%08x\n", i,
	136	(DMA_BUS_MODE + offset),
	137	readl(ioaddr + DMA_BUS_MODE + offset));
	138	}
	139	}
47dd7a54 GC	140	}
47dd7a54 GC	141
cadb7924	142	const struct stmmac_dma_ops dwmac1000_dma_ops = {
21d437cc GC	143	.init = dwmac1000_dma_init,
	144	.dump_regs = dwmac1000_dump_dma_regs,
	145	.dma_mode = dwmac1000_dma_operation_mode,
	146	.dma_diagnostic_fr = dwmac1000_dma_diagnostic_fr,
aec7ff27 GC	147	.enable_dma_transmission = dwmac_enable_dma_transmission,
	148	.enable_dma_irq = dwmac_enable_dma_irq,
	149	.disable_dma_irq = dwmac_disable_dma_irq,
	150	.start_tx = dwmac_dma_start_tx,
	151	.stop_tx = dwmac_dma_stop_tx,
	152	.start_rx = dwmac_dma_start_rx,
	153	.stop_rx = dwmac_dma_stop_rx,
	154	.dma_interrupt = dwmac_dma_interrupt,
db98a0b0	155	};