[J-u-boot.git] / drivers / spi / sh_spi.c

/*
 * SH SPI driver
 *
 * Copyright (C) 2011-2012 Renesas Solutions Corp.
 *
 * SPDX-License-Identifier:	GPL-2.0
 */

#include <common.h>
#include <console.h>
#include <malloc.h>
#include <spi.h>
#include <asm/io.h>
#include "sh_spi.h"

static void sh_spi_write(unsigned long data, unsigned long *reg)
{
	writel(data, reg);
}

static unsigned long sh_spi_read(unsigned long *reg)
{
	return readl(reg);
}

static void sh_spi_set_bit(unsigned long val, unsigned long *reg)
{
	unsigned long tmp;

	tmp = sh_spi_read(reg);
	tmp |= val;
	sh_spi_write(tmp, reg);
}

static void sh_spi_clear_bit(unsigned long val, unsigned long *reg)
{
	unsigned long tmp;

	tmp = sh_spi_read(reg);
	tmp &= ~val;
	sh_spi_write(tmp, reg);
}

static void clear_fifo(struct sh_spi *ss)
{
	sh_spi_set_bit(SH_SPI_RSTF, &ss->regs->cr2);
	sh_spi_clear_bit(SH_SPI_RSTF, &ss->regs->cr2);
}

static int recvbuf_wait(struct sh_spi *ss)
{
	while (sh_spi_read(&ss->regs->cr1) & SH_SPI_RBE) {
		if (ctrlc())
			return 1;
		udelay(10);
	}
	return 0;
}

static int write_fifo_empty_wait(struct sh_spi *ss)
{
	while (!(sh_spi_read(&ss->regs->cr1) & SH_SPI_TBE)) {
		if (ctrlc())
			return 1;
		udelay(10);
	}
	return 0;
}

void spi_init(void)
{
}

static void sh_spi_set_cs(struct sh_spi *ss, unsigned int cs)
{
	unsigned long val = 0;

	if (cs & 0x01)
		val |= SH_SPI_SSS0;
	if (cs & 0x02)
		val |= SH_SPI_SSS1;

	sh_spi_clear_bit(SH_SPI_SSS0 | SH_SPI_SSS1, &ss->regs->cr4);
	sh_spi_set_bit(val, &ss->regs->cr4);
}

struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
		unsigned int max_hz, unsigned int mode)
{
	struct sh_spi *ss;

	if (!spi_cs_is_valid(bus, cs))
		return NULL;

	ss = spi_alloc_slave(struct sh_spi, bus, cs);
	if (!ss)
		return NULL;

	ss->regs = (struct sh_spi_regs *)CONFIG_SH_SPI_BASE;

	/* SPI sycle stop */
	sh_spi_write(0xfe, &ss->regs->cr1);
	/* CR1 init */
	sh_spi_write(0x00, &ss->regs->cr1);
	/* CR3 init */
	sh_spi_write(0x00, &ss->regs->cr3);
	sh_spi_set_cs(ss, cs);

	clear_fifo(ss);

	/* 1/8 clock */
	sh_spi_write(sh_spi_read(&ss->regs->cr2) | 0x07, &ss->regs->cr2);
	udelay(10);

	return &ss->slave;
}

void spi_free_slave(struct spi_slave *slave)
{
	struct sh_spi *spi = to_sh_spi(slave);

	free(spi);
}

int spi_claim_bus(struct spi_slave *slave)
{
	return 0;
}

void spi_release_bus(struct spi_slave *slave)
{
	struct sh_spi *ss = to_sh_spi(slave);

	sh_spi_write(sh_spi_read(&ss->regs->cr1) &
		~(SH_SPI_SSA | SH_SPI_SSDB | SH_SPI_SSD), &ss->regs->cr1);
}

static int sh_spi_send(struct sh_spi *ss, const unsigned char *tx_data,
			unsigned int len, unsigned long flags)
{
	int i, cur_len, ret = 0;
	int remain = (int)len;

	if (len >= SH_SPI_FIFO_SIZE)
		sh_spi_set_bit(SH_SPI_SSA, &ss->regs->cr1);

	while (remain > 0) {
		cur_len = (remain < SH_SPI_FIFO_SIZE) ?
				remain : SH_SPI_FIFO_SIZE;
		for (i = 0; i < cur_len &&
			!(sh_spi_read(&ss->regs->cr4) & SH_SPI_WPABRT) &&
			!(sh_spi_read(&ss->regs->cr1) & SH_SPI_TBF);
				i++)
			sh_spi_write(tx_data[i], &ss->regs->tbr_rbr);

		cur_len = i;

		if (sh_spi_read(&ss->regs->cr4) & SH_SPI_WPABRT) {
			/* Abort the transaction */
			flags |= SPI_XFER_END;
			sh_spi_set_bit(SH_SPI_WPABRT, &ss->regs->cr4);
			ret = 1;
			break;
		}

		remain -= cur_len;
		tx_data += cur_len;

		if (remain > 0)
			write_fifo_empty_wait(ss);
	}

	if (flags & SPI_XFER_END) {
		sh_spi_clear_bit(SH_SPI_SSD | SH_SPI_SSDB, &ss->regs->cr1);
		sh_spi_set_bit(SH_SPI_SSA, &ss->regs->cr1);
		udelay(100);
		write_fifo_empty_wait(ss);
	}

	return ret;
}

static int sh_spi_receive(struct sh_spi *ss, unsigned char *rx_data,
			  unsigned int len, unsigned long flags)
{
	int i;

	if (len > SH_SPI_MAX_BYTE)
		sh_spi_write(SH_SPI_MAX_BYTE, &ss->regs->cr3);
	else
		sh_spi_write(len, &ss->regs->cr3);

	sh_spi_clear_bit(SH_SPI_SSD | SH_SPI_SSDB, &ss->regs->cr1);
	sh_spi_set_bit(SH_SPI_SSA, &ss->regs->cr1);

	for (i = 0; i < len; i++) {
		if (recvbuf_wait(ss))
			return 0;

		rx_data[i] = (unsigned char)sh_spi_read(&ss->regs->tbr_rbr);
	}
	sh_spi_write(0, &ss->regs->cr3);

	return 0;
}

int  spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
		void *din, unsigned long flags)
{
	struct sh_spi *ss = to_sh_spi(slave);
	const unsigned char *tx_data = dout;
	unsigned char *rx_data = din;
	unsigned int len = bitlen / 8;
	int ret = 0;

	if (flags & SPI_XFER_BEGIN)
		sh_spi_write(sh_spi_read(&ss->regs->cr1) & ~SH_SPI_SSA,
				&ss->regs->cr1);

	if (tx_data)
		ret = sh_spi_send(ss, tx_data, len, flags);

	if (ret == 0 && rx_data)
		ret = sh_spi_receive(ss, rx_data, len, flags);

	if (flags & SPI_XFER_END) {
		sh_spi_set_bit(SH_SPI_SSD, &ss->regs->cr1);
		udelay(100);

		sh_spi_clear_bit(SH_SPI_SSA | SH_SPI_SSDB | SH_SPI_SSD,
				 &ss->regs->cr1);
		clear_fifo(ss);
	}

	return ret;
}

int  spi_cs_is_valid(unsigned int bus, unsigned int cs)
{
	if (!bus && cs < SH_SPI_NUM_CS)
		return 1;
	else
		return 0;
}

void spi_cs_activate(struct spi_slave *slave)
{

}

void spi_cs_deactivate(struct spi_slave *slave)
{

}
Commit	Line	Data
6639562e YS	1	/*
	2	* SH SPI driver
	3	*
c1d4ad94	4	* Copyright (C) 2011-2012 Renesas Solutions Corp.
6639562e	5	*
5b8031cc	6	* SPDX-License-Identifier: GPL-2.0
6639562e YS	7	*/
	8
	9	#include <common.h>
24b852a7	10	#include <console.h>
6639562e YS	11	#include <malloc.h>
	12	#include <spi.h>
	13	#include <asm/io.h>
	14	#include "sh_spi.h"
	15
	16	static void sh_spi_write(unsigned long data, unsigned long *reg)
	17	{
	18	writel(data, reg);
	19	}
	20
	21	static unsigned long sh_spi_read(unsigned long *reg)
	22	{
	23	return readl(reg);
	24	}
	25
	26	static void sh_spi_set_bit(unsigned long val, unsigned long *reg)
	27	{
	28	unsigned long tmp;
	29
	30	tmp = sh_spi_read(reg);
	31	tmp \|= val;
	32	sh_spi_write(tmp, reg);
	33	}
	34
	35	static void sh_spi_clear_bit(unsigned long val, unsigned long *reg)
	36	{
	37	unsigned long tmp;
	38
	39	tmp = sh_spi_read(reg);
	40	tmp &= ~val;
	41	sh_spi_write(tmp, reg);
	42	}
	43
	44	static void clear_fifo(struct sh_spi *ss)
	45	{
	46	sh_spi_set_bit(SH_SPI_RSTF, &ss->regs->cr2);
	47	sh_spi_clear_bit(SH_SPI_RSTF, &ss->regs->cr2);
	48	}
	49
	50	static int recvbuf_wait(struct sh_spi *ss)
	51	{
	52	while (sh_spi_read(&ss->regs->cr1) & SH_SPI_RBE) {
	53	if (ctrlc())
	54	return 1;
	55	udelay(10);
	56	}
	57	return 0;
	58	}
	59
	60	static int write_fifo_empty_wait(struct sh_spi *ss)
	61	{
	62	while (!(sh_spi_read(&ss->regs->cr1) & SH_SPI_TBE)) {
	63	if (ctrlc())
	64	return 1;
	65	udelay(10);
	66	}
	67	return 0;
	68	}
	69
	70	void spi_init(void)
	71	{
	72	}
	73
c1d4ad94 YS	74	static void sh_spi_set_cs(struct sh_spi *ss, unsigned int cs)
	75	{
	76	unsigned long val = 0;
	77
	78	if (cs & 0x01)
	79	val \|= SH_SPI_SSS0;
	80	if (cs & 0x02)
	81	val \|= SH_SPI_SSS1;
	82
	83	sh_spi_clear_bit(SH_SPI_SSS0 \| SH_SPI_SSS1, &ss->regs->cr4);
	84	sh_spi_set_bit(val, &ss->regs->cr4);
	85	}
	86
6639562e YS	87	struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
	88	unsigned int max_hz, unsigned int mode)
	89	{
	90	struct sh_spi *ss;
	91
	92	if (!spi_cs_is_valid(bus, cs))
	93	return NULL;
	94
d3504fee	95	ss = spi_alloc_slave(struct sh_spi, bus, cs);
6639562e YS	96	if (!ss)
	97	return NULL;
	98
6639562e YS	99	ss->regs = (struct sh_spi_regs *)CONFIG_SH_SPI_BASE;
	100
	101	/* SPI sycle stop */
	102	sh_spi_write(0xfe, &ss->regs->cr1);
	103	/* CR1 init */
	104	sh_spi_write(0x00, &ss->regs->cr1);
	105	/* CR3 init */
	106	sh_spi_write(0x00, &ss->regs->cr3);
c1d4ad94	107	sh_spi_set_cs(ss, cs);
6639562e YS	108
	109	clear_fifo(ss);
	110
	111	/* 1/8 clock */
	112	sh_spi_write(sh_spi_read(&ss->regs->cr2) \| 0x07, &ss->regs->cr2);
	113	udelay(10);
	114
	115	return &ss->slave;
	116	}
	117
	118	void spi_free_slave(struct spi_slave *slave)
	119	{
	120	struct sh_spi *spi = to_sh_spi(slave);
	121
	122	free(spi);
	123	}
	124
	125	int spi_claim_bus(struct spi_slave *slave)
	126	{
	127	return 0;
	128	}
	129
	130	void spi_release_bus(struct spi_slave *slave)
	131	{
	132	struct sh_spi *ss = to_sh_spi(slave);
	133
	134	sh_spi_write(sh_spi_read(&ss->regs->cr1) &
	135	~(SH_SPI_SSA \| SH_SPI_SSDB \| SH_SPI_SSD), &ss->regs->cr1);
	136	}
	137
	138	static int sh_spi_send(struct sh_spi ss, const unsigned char tx_data,
	139	unsigned int len, unsigned long flags)
	140	{
	141	int i, cur_len, ret = 0;
	142	int remain = (int)len;
6639562e YS	143
	144	if (len >= SH_SPI_FIFO_SIZE)
	145	sh_spi_set_bit(SH_SPI_SSA, &ss->regs->cr1);
	146
	147	while (remain > 0) {
	148	cur_len = (remain < SH_SPI_FIFO_SIZE) ?
	149	remain : SH_SPI_FIFO_SIZE;
	150	for (i = 0; i < cur_len &&
	151	!(sh_spi_read(&ss->regs->cr4) & SH_SPI_WPABRT) &&
	152	!(sh_spi_read(&ss->regs->cr1) & SH_SPI_TBF);
	153	i++)
	154	sh_spi_write(tx_data[i], &ss->regs->tbr_rbr);
	155
	156	cur_len = i;
	157
	158	if (sh_spi_read(&ss->regs->cr4) & SH_SPI_WPABRT) {
	159	/* Abort the transaction */
	160	flags \|= SPI_XFER_END;
	161	sh_spi_set_bit(SH_SPI_WPABRT, &ss->regs->cr4);
	162	ret = 1;
	163	break;
	164	}
	165
	166	remain -= cur_len;
	167	tx_data += cur_len;
	168
	169	if (remain > 0)
	170	write_fifo_empty_wait(ss);
	171	}
	172
	173	if (flags & SPI_XFER_END) {
12f00caf	174	sh_spi_clear_bit(SH_SPI_SSD \| SH_SPI_SSDB, &ss->regs->cr1);
6639562e YS	175	sh_spi_set_bit(SH_SPI_SSA, &ss->regs->cr1);
	176	udelay(100);
	177	write_fifo_empty_wait(ss);
	178	}
	179
	180	return ret;
	181	}
	182
	183	static int sh_spi_receive(struct sh_spi ss, unsigned char rx_data,
	184	unsigned int len, unsigned long flags)
	185	{
	186	int i;
6639562e YS	187
	188	if (len > SH_SPI_MAX_BYTE)
	189	sh_spi_write(SH_SPI_MAX_BYTE, &ss->regs->cr3);
	190	else
	191	sh_spi_write(len, &ss->regs->cr3);
	192
12f00caf	193	sh_spi_clear_bit(SH_SPI_SSD \| SH_SPI_SSDB, &ss->regs->cr1);
6639562e YS	194	sh_spi_set_bit(SH_SPI_SSA, &ss->regs->cr1);
	195
	196	for (i = 0; i < len; i++) {
	197	if (recvbuf_wait(ss))
	198	return 0;
	199
	200	rx_data[i] = (unsigned char)sh_spi_read(&ss->regs->tbr_rbr);
	201	}
	202	sh_spi_write(0, &ss->regs->cr3);
	203
	204	return 0;
	205	}
	206
	207	int spi_xfer(struct spi_slave slave, unsigned int bitlen, const void dout,
	208	void *din, unsigned long flags)
	209	{
	210	struct sh_spi *ss = to_sh_spi(slave);
	211	const unsigned char *tx_data = dout;
	212	unsigned char *rx_data = din;
	213	unsigned int len = bitlen / 8;
	214	int ret = 0;
	215
	216	if (flags & SPI_XFER_BEGIN)
	217	sh_spi_write(sh_spi_read(&ss->regs->cr1) & ~SH_SPI_SSA,
	218	&ss->regs->cr1);
	219
	220	if (tx_data)
	221	ret = sh_spi_send(ss, tx_data, len, flags);
	222
	223	if (ret == 0 && rx_data)
	224	ret = sh_spi_receive(ss, rx_data, len, flags);
	225
	226	if (flags & SPI_XFER_END) {
	227	sh_spi_set_bit(SH_SPI_SSD, &ss->regs->cr1);
	228	udelay(100);
	229
	230	sh_spi_clear_bit(SH_SPI_SSA \| SH_SPI_SSDB \| SH_SPI_SSD,
	231	&ss->regs->cr1);
	232	clear_fifo(ss);
	233	}
	234
	235	return ret;
	236	}
	237
	238	int spi_cs_is_valid(unsigned int bus, unsigned int cs)
	239	{
c1d4ad94	240	if (!bus && cs < SH_SPI_NUM_CS)
6639562e YS	241	return 1;
	242	else
	243	return 0;
	244	}
	245
	246	void spi_cs_activate(struct spi_slave *slave)
	247	{
	248
	249	}
	250
	251	void spi_cs_deactivate(struct spi_slave *slave)
	252	{
	253
	254	}