/*
 * Coral-P(A)/Lime I2C adapter driver
 *
 * (C) 2011 DENX Software Engineering, Anatolij Gustschin <agust@denx.de>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 */

#include <linux/fb.h>
#include <linux/i2c.h>
#include <linux/io.h>
#include <linux/delay.h>
#include <linux/export.h>

#include "mb862xxfb.h"
#include "mb862xx_reg.h"

static int mb862xx_i2c_wait_event(struct i2c_adapter *adap)
{
	struct mb862xxfb_par *par = adap->algo_data;
	u32 reg;

	do {
		udelay(10);
		reg = inreg(i2c, GC_I2C_BCR);
		if (reg & (I2C_INT | I2C_BER))
			break;
	} while (1);

	return (reg & I2C_BER) ? 0 : 1;
}

static int mb862xx_i2c_do_address(struct i2c_adapter *adap, int addr)
{
	struct mb862xxfb_par *par = adap->algo_data;

	outreg(i2c, GC_I2C_DAR, addr);
	outreg(i2c, GC_I2C_CCR, I2C_CLOCK_AND_ENABLE);
	outreg(i2c, GC_I2C_BCR, par->i2c_rs ? I2C_REPEATED_START : I2C_START);
	if (!mb862xx_i2c_wait_event(adap))
		return -EIO;
	par->i2c_rs = !(inreg(i2c, GC_I2C_BSR) & I2C_LRB);
	return par->i2c_rs;
}

static int mb862xx_i2c_write_byte(struct i2c_adapter *adap, u8 byte)
{
	struct mb862xxfb_par *par = adap->algo_data;

	outreg(i2c, GC_I2C_DAR, byte);
	outreg(i2c, GC_I2C_BCR, I2C_START);
	if (!mb862xx_i2c_wait_event(adap))
		return -EIO;
	return !(inreg(i2c, GC_I2C_BSR) & I2C_LRB);
}

static int mb862xx_i2c_read_byte(struct i2c_adapter *adap, u8 *byte, int last)
{
	struct mb862xxfb_par *par = adap->algo_data;

	outreg(i2c, GC_I2C_BCR, I2C_START | (last ? 0 : I2C_ACK));
	if (!mb862xx_i2c_wait_event(adap))
		return 0;
	*byte = inreg(i2c, GC_I2C_DAR);
	return 1;
}

static void mb862xx_i2c_stop(struct i2c_adapter *adap)
{
	struct mb862xxfb_par *par = adap->algo_data;

	outreg(i2c, GC_I2C_BCR, I2C_STOP);
	outreg(i2c, GC_I2C_CCR, I2C_DISABLE);
	par->i2c_rs = 0;
}

static int mb862xx_i2c_read(struct i2c_adapter *adap, struct i2c_msg *m)
{
	int i, ret = 0;
	int last = m->len - 1;

	for (i = 0; i < m->len; i++) {
		if (!mb862xx_i2c_read_byte(adap, &m->buf[i], i == last)) {
			ret = -EIO;
			break;
		}
	}
	return ret;
}

static int mb862xx_i2c_write(struct i2c_adapter *adap, struct i2c_msg *m)
{
	int i, ret = 0;

	for (i = 0; i < m->len; i++) {
		if (!mb862xx_i2c_write_byte(adap, m->buf[i])) {
			ret = -EIO;
			break;
		}
	}
	return ret;
}

static int mb862xx_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
			int num)
{
	struct mb862xxfb_par *par = adap->algo_data;
	struct i2c_msg *m;
	int addr;
	int i = 0, err = 0;

	dev_dbg(par->dev, "%s: %d msgs\n", __func__, num);

	for (i = 0; i < num; i++) {
		m = &msgs[i];
		if (!m->len) {
			dev_dbg(par->dev, "%s: null msgs\n", __func__);
			continue;
		}
		addr = m->addr;
		if (m->flags & I2C_M_RD)
			addr |= 1;

		err = mb862xx_i2c_do_address(adap, addr);
		if (err < 0)
			break;
		if (m->flags & I2C_M_RD)
			err = mb862xx_i2c_read(adap, m);
		else
			err = mb862xx_i2c_write(adap, m);
	}

	if (i)
		mb862xx_i2c_stop(adap);

	return (err < 0) ? err : i;
}

static u32 mb862xx_func(struct i2c_adapter *adap)
{
	return I2C_FUNC_SMBUS_BYTE_DATA;
}

static const struct i2c_algorithm mb862xx_algo = {
	.master_xfer	= mb862xx_xfer,
	.functionality	= mb862xx_func,
};

static struct i2c_adapter mb862xx_i2c_adapter = {
	.name		= "MB862xx I2C adapter",
	.algo		= &mb862xx_algo,
	.owner		= THIS_MODULE,
};

int mb862xx_i2c_init(struct mb862xxfb_par *par)
{
	mb862xx_i2c_adapter.algo_data = par;
	par->adap = &mb862xx_i2c_adapter;

	return i2c_add_adapter(par->adap);
}

void mb862xx_i2c_exit(struct mb862xxfb_par *par)
{
	if (par->adap) {
		i2c_del_adapter(par->adap);
		par->adap = NULL;
	}
}
class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Linus Walleij &lt;linus.walleij@linaro.org&gt;</td><td class='right'>2016-11-12 15:22:38 +0100</td></tr>
<tr><th>committer</th><td>Mark Brown &lt;broonie@kernel.org&gt;</td><td class='right'>2016-11-13 09:22:37 +0000</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/tools/iio/Makefile?h=nds-private-remove&amp;id=295070e9aa015abb9b92cccfbb1e43954e938133'>295070e9aa015abb9b92cccfbb1e43954e938133</a> (<a href='/cgit.cgi/linux/net-next.git/patch/tools/iio/Makefile?id=295070e9aa015abb9b92cccfbb1e43954e938133'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?h=nds-private-remove&amp;id=295070e9aa015abb9b92cccfbb1e43954e938133'>d0a08e7ce280bc877e22424437dbe59fa1857d9a</a> /<a href='/cgit.cgi/linux/net-next.git/tree/tools/iio/Makefile?h=nds-private-remove&amp;id=295070e9aa015abb9b92cccfbb1e43954e938133'>tools/iio/Makefile</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/tools/iio/Makefile?h=nds-private-remove&amp;id=1001354ca34179f3db924eb66672442a173147dc'>1001354ca34179f3db924eb66672442a173147dc</a> (<a href='/cgit.cgi/linux/net-next.git/diff/tools/iio/Makefile?h=nds-private-remove&amp;id=295070e9aa015abb9b92cccfbb1e43954e938133&amp;id2=1001354ca34179f3db924eb66672442a173147dc'>diff</a>)</td></tr></table>
<div class='commit-subject'>regulator: stw481x-vmmc: fix ages old enable error</div><div class='commit-msg'>The regulator has never been properly enabled, it has been
dormant all the time. It's strange that MMC was working
at all, but it likely worked by the signals going through
the levelshifter and reaching the card anyways.

Fixes: 3615a34ea1a6 ("regulator: add STw481x VMMC driver")
Signed-off-by: Linus Walleij &lt;linus.walleij@linaro.org&gt;
Signed-off-by: Mark Brown &lt;broonie@kernel.org&gt;
Cc: stable@vger.kernel.org
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=295070e9aa015abb9b92cccfbb1e43954e938133'>Diffstat</a> (limited to 'tools/iio/Makefile')</div><table summary='diffstat' class='diffstat'>