/*
 * 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;
	}
}
e='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>Mark Rutland &lt;mark.rutland@arm.com&gt;</td><td class='right'>2017-01-25 19:30:09 +0000</td></tr>
<tr><th>committer</th><td>Mark Brown &lt;broonie@kernel.org&gt;</td><td class='right'>2017-01-25 21:05:37 +0000</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/dt-bindings/clock/r8a7796-cpg-mssr.h?id=1372cef1c697d8aac0cc923f8aa2c37d790ec9ed'>1372cef1c697d8aac0cc923f8aa2c37d790ec9ed</a> (<a href='/cgit.cgi/linux/net-next.git/patch/include/dt-bindings/clock/r8a7796-cpg-mssr.h?id=1372cef1c697d8aac0cc923f8aa2c37d790ec9ed'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=1372cef1c697d8aac0cc923f8aa2c37d790ec9ed'>ed5f350cd559bc15ae370f0c9fd280204e98597d</a> /<a href='/cgit.cgi/linux/net-next.git/tree/include/dt-bindings/clock/r8a7796-cpg-mssr.h?id=1372cef1c697d8aac0cc923f8aa2c37d790ec9ed'>include/dt-bindings/clock/r8a7796-cpg-mssr.h</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/dt-bindings/clock/r8a7796-cpg-mssr.h?id=d00b74613fb18dfd0a5aa99270ee2e72d5c808d7'>d00b74613fb18dfd0a5aa99270ee2e72d5c808d7</a> (<a href='/cgit.cgi/linux/net-next.git/diff/include/dt-bindings/clock/r8a7796-cpg-mssr.h?id=1372cef1c697d8aac0cc923f8aa2c37d790ec9ed&amp;id2=d00b74613fb18dfd0a5aa99270ee2e72d5c808d7'>diff</a>)</td></tr></table>
<div class='commit-subject'>regulator: fixed: Revert support for ACPI interface</div><div class='commit-msg'>This reverts commit 13bed58ce874 (regulator: fixed: add support for ACPI
interface).

While there does appear to be a practical need to manage regulators on ACPI
systems, using ad-hoc properties to describe regulators to the kernel presents
a number of problems (especially should ACPI gain first class support for such
things), and there are ongoing discussions as to how to manage this.

Until there is a rough consensus, revert commit 13bed58ce8748d43, which hasn't
been in a released kernel yet as discussed in [1] and the surrounding thread.

[1] http://lkml.kernel.org/r/20170125184949.x2wkoo7kbaaajkjk@sirena.org.uk

Signed-off-by: Mark Rutland &lt;mark.rutland@arm.com&gt;
Cc: Liam Girdwood &lt;lgirdwood@gmail.com&gt;
Cc: Lorenzo Pieralisi &lt;lorenzo.pieralisi@arm.com&gt;
Cc: Lu Baolu &lt;baolu.lu@linux.intel.com&gt;
Cc: Mark Brown &lt;broonie@kernel.org&gt;
Cc: Rafael J. Wysocki &lt;rafael@kernel.org&gt;
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Mark Brown &lt;broonie@kernel.org&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=1372cef1c697d8aac0cc923f8aa2c37d790ec9ed'>Diffstat</a> (limited to 'include/dt-bindings/clock/r8a7796-cpg-mssr.h')</div><table summary='diffstat' class='diffstat'>