[deliverable/linux.git] / drivers / spi / spi-dw-mid.c

/*
 * Special handling for DW core on Intel MID platform
 *
 * Copyright (c) 2009, 2014 Intel Corporation.
 *
 * 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.
 */

#include <linux/dma-mapping.h>
#include <linux/dmaengine.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/spi/spi.h>
#include <linux/types.h>

#include "spi-dw.h"

#ifdef CONFIG_SPI_DW_MID_DMA
#include <linux/intel_mid_dma.h>
#include <linux/pci.h>

#define RX_BUSY		0
#define TX_BUSY		1

struct mid_dma {
	struct intel_mid_dma_slave	dmas_tx;
	struct intel_mid_dma_slave	dmas_rx;
};

static bool mid_spi_dma_chan_filter(struct dma_chan *chan, void *param)
{
	struct dw_spi *dws = param;

	return dws->dma_dev == chan->device->dev;
}

static int mid_spi_dma_init(struct dw_spi *dws)
{
	struct mid_dma *dw_dma = dws->dma_priv;
	struct pci_dev *dma_dev;
	struct intel_mid_dma_slave *rxs, *txs;
	dma_cap_mask_t mask;

	/*
	 * Get pci device for DMA controller, currently it could only
	 * be the DMA controller of Medfield
	 */
	dma_dev = pci_get_device(PCI_VENDOR_ID_INTEL, 0x0827, NULL);
	if (!dma_dev)
		return -ENODEV;

	dws->dma_dev = &dma_dev->dev;

	dma_cap_zero(mask);
	dma_cap_set(DMA_SLAVE, mask);

	/* 1. Init rx channel */
	dws->rxchan = dma_request_channel(mask, mid_spi_dma_chan_filter, dws);
	if (!dws->rxchan)
		goto err_exit;
	rxs = &dw_dma->dmas_rx;
	rxs->hs_mode = LNW_DMA_HW_HS;
	rxs->cfg_mode = LNW_DMA_PER_TO_MEM;
	dws->rxchan->private = rxs;

	/* 2. Init tx channel */
	dws->txchan = dma_request_channel(mask, mid_spi_dma_chan_filter, dws);
	if (!dws->txchan)
		goto free_rxchan;
	txs = &dw_dma->dmas_tx;
	txs->hs_mode = LNW_DMA_HW_HS;
	txs->cfg_mode = LNW_DMA_MEM_TO_PER;
	dws->txchan->private = txs;

	dws->dma_inited = 1;
	return 0;

free_rxchan:
	dma_release_channel(dws->rxchan);
err_exit:
	return -EBUSY;
}

static void mid_spi_dma_exit(struct dw_spi *dws)
{
	if (!dws->dma_inited)
		return;

	dmaengine_terminate_all(dws->txchan);
	dma_release_channel(dws->txchan);

	dmaengine_terminate_all(dws->rxchan);
	dma_release_channel(dws->rxchan);
}

static enum dma_slave_buswidth convert_dma_width(u32 dma_width) {
	if (dma_width == 1)
		return DMA_SLAVE_BUSWIDTH_1_BYTE;
	else if (dma_width == 2)
		return DMA_SLAVE_BUSWIDTH_2_BYTES;

	return DMA_SLAVE_BUSWIDTH_UNDEFINED;
}

/*
 * dws->dma_chan_busy is set before the dma transfer starts, callback for tx
 * channel will clear a corresponding bit.
 */
static void dw_spi_dma_tx_done(void *arg)
{
	struct dw_spi *dws = arg;

	clear_bit(TX_BUSY, &dws->dma_chan_busy);
	if (test_bit(RX_BUSY, &dws->dma_chan_busy))
		return;
	spi_finalize_current_transfer(dws->master);
}

static struct dma_async_tx_descriptor *dw_spi_dma_prepare_tx(struct dw_spi *dws)
{
	struct dma_slave_config txconf;
	struct dma_async_tx_descriptor *txdesc;

	if (!dws->tx_dma)
		return NULL;

	txconf.direction = DMA_MEM_TO_DEV;
	txconf.dst_addr = dws->dma_addr;
	txconf.dst_maxburst = LNW_DMA_MSIZE_16;
	txconf.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
	txconf.dst_addr_width = convert_dma_width(dws->dma_width);
	txconf.device_fc = false;

	dmaengine_slave_config(dws->txchan, &txconf);

	memset(&dws->tx_sgl, 0, sizeof(dws->tx_sgl));
	dws->tx_sgl.dma_address = dws->tx_dma;
	dws->tx_sgl.length = dws->len;

	txdesc = dmaengine_prep_slave_sg(dws->txchan,
				&dws->tx_sgl,
				1,
				DMA_MEM_TO_DEV,
				DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
	if (!txdesc)
		return NULL;

	txdesc->callback = dw_spi_dma_tx_done;
	txdesc->callback_param = dws;

	return txdesc;
}

/*
 * dws->dma_chan_busy is set before the dma transfer starts, callback for rx
 * channel will clear a corresponding bit.
 */
static void dw_spi_dma_rx_done(void *arg)
{
	struct dw_spi *dws = arg;

	clear_bit(RX_BUSY, &dws->dma_chan_busy);
	if (test_bit(TX_BUSY, &dws->dma_chan_busy))
		return;
	spi_finalize_current_transfer(dws->master);
}

static struct dma_async_tx_descriptor *dw_spi_dma_prepare_rx(struct dw_spi *dws)
{
	struct dma_slave_config rxconf;
	struct dma_async_tx_descriptor *rxdesc;

	if (!dws->rx_dma)
		return NULL;

	rxconf.direction = DMA_DEV_TO_MEM;
	rxconf.src_addr = dws->dma_addr;
	rxconf.src_maxburst = LNW_DMA_MSIZE_16;
	rxconf.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
	rxconf.src_addr_width = convert_dma_width(dws->dma_width);
	rxconf.device_fc = false;

	dmaengine_slave_config(dws->rxchan, &rxconf);

	memset(&dws->rx_sgl, 0, sizeof(dws->rx_sgl));
	dws->rx_sgl.dma_address = dws->rx_dma;
	dws->rx_sgl.length = dws->len;

	rxdesc = dmaengine_prep_slave_sg(dws->rxchan,
				&dws->rx_sgl,
				1,
				DMA_DEV_TO_MEM,
				DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
	if (!rxdesc)
		return NULL;

	rxdesc->callback = dw_spi_dma_rx_done;
	rxdesc->callback_param = dws;

	return rxdesc;
}

static int mid_spi_dma_setup(struct dw_spi *dws)
{
	u16 dma_ctrl = 0;

	dw_writew(dws, DW_SPI_DMARDLR, 0xf);
	dw_writew(dws, DW_SPI_DMATDLR, 0x10);

	if (dws->tx_dma)
		dma_ctrl |= SPI_DMA_TDMAE;
	if (dws->rx_dma)
		dma_ctrl |= SPI_DMA_RDMAE;
	dw_writew(dws, DW_SPI_DMACR, dma_ctrl);

	return 0;
}

static int mid_spi_dma_transfer(struct dw_spi *dws)
{
	struct dma_async_tx_descriptor *txdesc, *rxdesc;

	/* Prepare the TX dma transfer */
	txdesc = dw_spi_dma_prepare_tx(dws);

	/* Prepare the RX dma transfer */
	rxdesc = dw_spi_dma_prepare_rx(dws);

	/* rx must be started before tx due to spi instinct */
	if (rxdesc) {
		set_bit(RX_BUSY, &dws->dma_chan_busy);
		dmaengine_submit(rxdesc);
		dma_async_issue_pending(dws->rxchan);
	}

	if (txdesc) {
		set_bit(TX_BUSY, &dws->dma_chan_busy);
		dmaengine_submit(txdesc);
		dma_async_issue_pending(dws->txchan);
	}

	return 0;
}

static struct dw_spi_dma_ops mid_dma_ops = {
	.dma_init	= mid_spi_dma_init,
	.dma_exit	= mid_spi_dma_exit,
	.dma_setup	= mid_spi_dma_setup,
	.dma_transfer	= mid_spi_dma_transfer,
};
#endif

/* Some specific info for SPI0 controller on Intel MID */

/* HW info for MRST Clk Control Unit, 32b reg per controller */
#define MRST_SPI_CLK_BASE	100000000	/* 100m */
#define MRST_CLK_SPI_REG	0xff11d86c
#define CLK_SPI_BDIV_OFFSET	0
#define CLK_SPI_BDIV_MASK	0x00000007
#define CLK_SPI_CDIV_OFFSET	9
#define CLK_SPI_CDIV_MASK	0x00000e00
#define CLK_SPI_DISABLE_OFFSET	8

int dw_spi_mid_init(struct dw_spi *dws)
{
	void __iomem *clk_reg;
	u32 clk_cdiv;

	clk_reg = ioremap_nocache(MRST_CLK_SPI_REG, 16);
	if (!clk_reg)
		return -ENOMEM;

	/* Get SPI controller operating freq info */
	clk_cdiv = readl(clk_reg + dws->bus_num * sizeof(u32));
	clk_cdiv &= CLK_SPI_CDIV_MASK;
	clk_cdiv >>= CLK_SPI_CDIV_OFFSET;
	dws->max_freq = MRST_SPI_CLK_BASE / (clk_cdiv + 1);

	iounmap(clk_reg);

#ifdef CONFIG_SPI_DW_MID_DMA
	dws->dma_priv = kzalloc(sizeof(struct mid_dma), GFP_KERNEL);
	if (!dws->dma_priv)
		return -ENOMEM;
	dws->dma_ops = &mid_dma_ops;
#endif
	return 0;
}
Commit	Line	Data
7063c0d9	1	/*
ca632f55	2	* Special handling for DW core on Intel MID platform
7063c0d9	3	*
197e96b4	4	* Copyright (c) 2009, 2014 Intel Corporation.
7063c0d9 FT	5	*
	6	* This program is free software; you can redistribute it and/or modify it
	7	* under the terms and conditions of the GNU General Public License,
	8	* version 2, as published by the Free Software Foundation.
	9	*
	10	* This program is distributed in the hope it will be useful, but WITHOUT
	11	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	12	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	13	* more details.
7063c0d9 FT	14	*/
	15
	16	#include <linux/dma-mapping.h>
	17	#include <linux/dmaengine.h>
	18	#include <linux/interrupt.h>
	19	#include <linux/slab.h>
	20	#include <linux/spi/spi.h>
258aea76	21	#include <linux/types.h>
568a60ed	22
ca632f55	23	#include "spi-dw.h"
7063c0d9 FT	24
	25	#ifdef CONFIG_SPI_DW_MID_DMA
	26	#include <linux/intel_mid_dma.h>
	27	#include <linux/pci.h>
	28
30c8eb52 AS	29	#define RX_BUSY 0
	30	#define TX_BUSY 1
	31
7063c0d9 FT	32	struct mid_dma {
	33	struct intel_mid_dma_slave dmas_tx;
	34	struct intel_mid_dma_slave dmas_rx;
	35	};
	36
	37	static bool mid_spi_dma_chan_filter(struct dma_chan chan, void param)
	38	{
	39	struct dw_spi *dws = param;
	40
b89e9c87	41	return dws->dma_dev == chan->device->dev;
7063c0d9 FT	42	}
	43
	44	static int mid_spi_dma_init(struct dw_spi *dws)
	45	{
	46	struct mid_dma *dw_dma = dws->dma_priv;
b89e9c87	47	struct pci_dev *dma_dev;
7063c0d9 FT	48	struct intel_mid_dma_slave rxs, txs;
	49	dma_cap_mask_t mask;
	50
	51	/*
	52	* Get pci device for DMA controller, currently it could only
ea092455	53	* be the DMA controller of Medfield
7063c0d9	54	*/
b89e9c87 AS	55	dma_dev = pci_get_device(PCI_VENDOR_ID_INTEL, 0x0827, NULL);
	56	if (!dma_dev)
	57	return -ENODEV;
	58
	59	dws->dma_dev = &dma_dev->dev;
7063c0d9 FT	60
	61	dma_cap_zero(mask);
	62	dma_cap_set(DMA_SLAVE, mask);
	63
	64	/* 1. Init rx channel */
	65	dws->rxchan = dma_request_channel(mask, mid_spi_dma_chan_filter, dws);
	66	if (!dws->rxchan)
	67	goto err_exit;
	68	rxs = &dw_dma->dmas_rx;
	69	rxs->hs_mode = LNW_DMA_HW_HS;
	70	rxs->cfg_mode = LNW_DMA_PER_TO_MEM;
	71	dws->rxchan->private = rxs;
	72
	73	/* 2. Init tx channel */
	74	dws->txchan = dma_request_channel(mask, mid_spi_dma_chan_filter, dws);
	75	if (!dws->txchan)
	76	goto free_rxchan;
	77	txs = &dw_dma->dmas_tx;
	78	txs->hs_mode = LNW_DMA_HW_HS;
	79	txs->cfg_mode = LNW_DMA_MEM_TO_PER;
	80	dws->txchan->private = txs;
	81
	82	dws->dma_inited = 1;
	83	return 0;
	84
	85	free_rxchan:
	86	dma_release_channel(dws->rxchan);
	87	err_exit:
b89e9c87	88	return -EBUSY;
7063c0d9 FT	89	}
	90
	91	static void mid_spi_dma_exit(struct dw_spi *dws)
	92	{
fb57862e AS	93	if (!dws->dma_inited)
fb57862e AS	94	return;
8e45ef68 AS	95
8e45ef68 AS	96	dmaengine_terminate_all(dws->txchan);
7063c0d9	97	dma_release_channel(dws->txchan);
8e45ef68 AS	98
8e45ef68 AS	99	dmaengine_terminate_all(dws->rxchan);
7063c0d9 FT	100	dma_release_channel(dws->rxchan);
	101	}
	102
e31abce7 AS	103	static enum dma_slave_buswidth convert_dma_width(u32 dma_width) {
	104	if (dma_width == 1)
	105	return DMA_SLAVE_BUSWIDTH_1_BYTE;
	106	else if (dma_width == 2)
	107	return DMA_SLAVE_BUSWIDTH_2_BYTES;
	108
	109	return DMA_SLAVE_BUSWIDTH_UNDEFINED;
	110	}
	111
7063c0d9	112	/*
30c8eb52 AS	113	* dws->dma_chan_busy is set before the dma transfer starts, callback for tx
30c8eb52 AS	114	* channel will clear a corresponding bit.
7063c0d9	115	*/
30c8eb52	116	static void dw_spi_dma_tx_done(void *arg)
7063c0d9 FT	117	{
	118	struct dw_spi *dws = arg;
	119
854d2f24 AS	120	clear_bit(TX_BUSY, &dws->dma_chan_busy);
854d2f24 AS	121	if (test_bit(RX_BUSY, &dws->dma_chan_busy))
7063c0d9	122	return;
c22c62db	123	spi_finalize_current_transfer(dws->master);
7063c0d9 FT	124	}
7063c0d9 FT	125
a5c2db96	126	static struct dma_async_tx_descriptor dw_spi_dma_prepare_tx(struct dw_spi dws)
7063c0d9	127	{
a5c2db96 AS	128	struct dma_slave_config txconf;
a5c2db96 AS	129	struct dma_async_tx_descriptor *txdesc;
7063c0d9	130
30c8eb52 AS	131	if (!dws->tx_dma)
	132	return NULL;
	133
a485df4b	134	txconf.direction = DMA_MEM_TO_DEV;
7063c0d9 FT	135	txconf.dst_addr = dws->dma_addr;
	136	txconf.dst_maxburst = LNW_DMA_MSIZE_16;
	137	txconf.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
e31abce7	138	txconf.dst_addr_width = convert_dma_width(dws->dma_width);
258aea76	139	txconf.device_fc = false;
7063c0d9	140
2a285299	141	dmaengine_slave_config(dws->txchan, &txconf);
7063c0d9 FT	142
	143	memset(&dws->tx_sgl, 0, sizeof(dws->tx_sgl));
	144	dws->tx_sgl.dma_address = dws->tx_dma;
	145	dws->tx_sgl.length = dws->len;
	146
2a285299	147	txdesc = dmaengine_prep_slave_sg(dws->txchan,
7063c0d9 FT	148	&dws->tx_sgl,
7063c0d9 FT	149	1,
a485df4b	150	DMA_MEM_TO_DEV,
f7477c2b	151	DMA_PREP_INTERRUPT \| DMA_CTRL_ACK);
c9dafb27 AS	152	if (!txdesc)
	153	return NULL;
	154
30c8eb52	155	txdesc->callback = dw_spi_dma_tx_done;
7063c0d9 FT	156	txdesc->callback_param = dws;
7063c0d9 FT	157
a5c2db96 AS	158	return txdesc;
	159	}
	160
30c8eb52 AS	161	/*
	162	* dws->dma_chan_busy is set before the dma transfer starts, callback for rx
	163	* channel will clear a corresponding bit.
	164	*/
	165	static void dw_spi_dma_rx_done(void *arg)
	166	{
	167	struct dw_spi *dws = arg;
	168
854d2f24 AS	169	clear_bit(RX_BUSY, &dws->dma_chan_busy);
854d2f24 AS	170	if (test_bit(TX_BUSY, &dws->dma_chan_busy))
30c8eb52	171	return;
c22c62db	172	spi_finalize_current_transfer(dws->master);
30c8eb52 AS	173	}
30c8eb52 AS	174
a5c2db96 AS	175	static struct dma_async_tx_descriptor dw_spi_dma_prepare_rx(struct dw_spi dws)
	176	{
	177	struct dma_slave_config rxconf;
	178	struct dma_async_tx_descriptor *rxdesc;
	179
30c8eb52 AS	180	if (!dws->rx_dma)
	181	return NULL;
	182
a485df4b	183	rxconf.direction = DMA_DEV_TO_MEM;
7063c0d9 FT	184	rxconf.src_addr = dws->dma_addr;
	185	rxconf.src_maxburst = LNW_DMA_MSIZE_16;
	186	rxconf.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
e31abce7	187	rxconf.src_addr_width = convert_dma_width(dws->dma_width);
258aea76	188	rxconf.device_fc = false;
7063c0d9	189
2a285299	190	dmaengine_slave_config(dws->rxchan, &rxconf);
7063c0d9 FT	191
	192	memset(&dws->rx_sgl, 0, sizeof(dws->rx_sgl));
	193	dws->rx_sgl.dma_address = dws->rx_dma;
	194	dws->rx_sgl.length = dws->len;
	195
2a285299	196	rxdesc = dmaengine_prep_slave_sg(dws->rxchan,
7063c0d9 FT	197	&dws->rx_sgl,
7063c0d9 FT	198	1,
a485df4b	199	DMA_DEV_TO_MEM,
f7477c2b	200	DMA_PREP_INTERRUPT \| DMA_CTRL_ACK);
c9dafb27 AS	201	if (!rxdesc)
	202	return NULL;
	203
30c8eb52	204	rxdesc->callback = dw_spi_dma_rx_done;
7063c0d9 FT	205	rxdesc->callback_param = dws;
7063c0d9 FT	206
a5c2db96 AS	207	return rxdesc;
	208	}
	209
9f14538e	210	static int mid_spi_dma_setup(struct dw_spi *dws)
a5c2db96 AS	211	{
	212	u16 dma_ctrl = 0;
	213
a5c2db96 AS	214	dw_writew(dws, DW_SPI_DMARDLR, 0xf);
	215	dw_writew(dws, DW_SPI_DMATDLR, 0x10);
	216
	217	if (dws->tx_dma)
	218	dma_ctrl \|= SPI_DMA_TDMAE;
	219	if (dws->rx_dma)
	220	dma_ctrl \|= SPI_DMA_RDMAE;
	221	dw_writew(dws, DW_SPI_DMACR, dma_ctrl);
	222
9f14538e	223	return 0;
a5c2db96 AS	224	}
a5c2db96 AS	225
9f14538e	226	static int mid_spi_dma_transfer(struct dw_spi *dws)
a5c2db96 AS	227	{
	228	struct dma_async_tx_descriptor txdesc, rxdesc;
	229
9f14538e	230	/* Prepare the TX dma transfer */
a5c2db96 AS	231	txdesc = dw_spi_dma_prepare_tx(dws);
a5c2db96 AS	232
9f14538e	233	/* Prepare the RX dma transfer */
a5c2db96 AS	234	rxdesc = dw_spi_dma_prepare_rx(dws);
a5c2db96 AS	235
7063c0d9	236	/* rx must be started before tx due to spi instinct */
30c8eb52 AS	237	if (rxdesc) {
	238	set_bit(RX_BUSY, &dws->dma_chan_busy);
	239	dmaengine_submit(rxdesc);
	240	dma_async_issue_pending(dws->rxchan);
	241	}
	242
	243	if (txdesc) {
	244	set_bit(TX_BUSY, &dws->dma_chan_busy);
	245	dmaengine_submit(txdesc);
	246	dma_async_issue_pending(dws->txchan);
	247	}
f7477c2b	248
7063c0d9 FT	249	return 0;
	250	}
	251
	252	static struct dw_spi_dma_ops mid_dma_ops = {
	253	.dma_init = mid_spi_dma_init,
	254	.dma_exit = mid_spi_dma_exit,
9f14538e	255	.dma_setup = mid_spi_dma_setup,
7063c0d9 FT	256	.dma_transfer = mid_spi_dma_transfer,
	257	};
	258	#endif
	259
ea092455	260	/* Some specific info for SPI0 controller on Intel MID */
7063c0d9	261
d9c14743	262	/* HW info for MRST Clk Control Unit, 32b reg per controller */
7063c0d9	263	#define MRST_SPI_CLK_BASE 100000000 /* 100m */
d9c14743	264	#define MRST_CLK_SPI_REG 0xff11d86c
7063c0d9 FT	265	#define CLK_SPI_BDIV_OFFSET 0
	266	#define CLK_SPI_BDIV_MASK 0x00000007
	267	#define CLK_SPI_CDIV_OFFSET 9
	268	#define CLK_SPI_CDIV_MASK 0x00000e00
	269	#define CLK_SPI_DISABLE_OFFSET 8
	270
	271	int dw_spi_mid_init(struct dw_spi *dws)
	272	{
7eb187b3 HS	273	void __iomem *clk_reg;
7eb187b3 HS	274	u32 clk_cdiv;
7063c0d9	275
d9c14743	276	clk_reg = ioremap_nocache(MRST_CLK_SPI_REG, 16);
7063c0d9 FT	277	if (!clk_reg)
	278	return -ENOMEM;
	279
d9c14743 AS	280	/* Get SPI controller operating freq info */
	281	clk_cdiv = readl(clk_reg + dws->bus_num * sizeof(u32));
	282	clk_cdiv &= CLK_SPI_CDIV_MASK;
	283	clk_cdiv >>= CLK_SPI_CDIV_OFFSET;
7063c0d9	284	dws->max_freq = MRST_SPI_CLK_BASE / (clk_cdiv + 1);
d9c14743	285
7063c0d9 FT	286	iounmap(clk_reg);
7063c0d9 FT	287
7063c0d9 FT	288	#ifdef CONFIG_SPI_DW_MID_DMA
	289	dws->dma_priv = kzalloc(sizeof(struct mid_dma), GFP_KERNEL);
	290	if (!dws->dma_priv)
	291	return -ENOMEM;
	292	dws->dma_ops = &mid_dma_ops;
	293	#endif
	294	return 0;
	295	}