/*
 * 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;
	}
}
 method='get'><input type='hidden' name='h' value='nds-private-remove'/><input type='hidden' name='id' value='0becc0ae5b42828785b589f686725ff5bc3b9b25'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td 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>Thomas Gleixner &lt;tglx@linutronix.de&gt;</td><td class='right'>2017-01-31 09:37:34 +0100</td></tr>
<tr><th>committer</th><td>Thomas Gleixner &lt;tglx@linutronix.de&gt;</td><td class='right'>2017-01-31 21:47:58 +0100</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/sound/soc/codecs/wm8804-spi.c?h=nds-private-remove&amp;id=0becc0ae5b42828785b589f686725ff5bc3b9b25'>0becc0ae5b42828785b589f686725ff5bc3b9b25</a> (<a href='/cgit.cgi/linux/net-next.git/patch/sound/soc/codecs/wm8804-spi.c?id=0becc0ae5b42828785b589f686725ff5bc3b9b25'>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=0becc0ae5b42828785b589f686725ff5bc3b9b25'>be6d0e1f37c38ed0a7dd5da2d4b1e93f0fb43101</a> /<a href='/cgit.cgi/linux/net-next.git/tree/sound/soc/codecs/wm8804-spi.c?h=nds-private-remove&amp;id=0becc0ae5b42828785b589f686725ff5bc3b9b25'>sound/soc/codecs/wm8804-spi.c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/sound/soc/codecs/wm8804-spi.c?h=nds-private-remove&amp;id=24c2503255d35c269b67162c397a1a1c1e02f6ce'>24c2503255d35c269b67162c397a1a1c1e02f6ce</a> (<a href='/cgit.cgi/linux/net-next.git/diff/sound/soc/codecs/wm8804-spi.c?h=nds-private-remove&amp;id=0becc0ae5b42828785b589f686725ff5bc3b9b25&amp;id2=24c2503255d35c269b67162c397a1a1c1e02f6ce'>diff</a>)</td></tr></table>
<div class='commit-subject'>x86/mce: Make timer handling more robust</div><div class='commit-msg'>Erik reported that on a preproduction hardware a CMCI storm triggers the
BUG_ON in add_timer_on(). The reason is that the per CPU MCE timer is
started by the CMCI logic before the MCE CPU hotplug callback starts the
timer with add_timer_on(). So the timer is already queued which triggers
the BUG.

Using add_timer_on() is pretty pointless in this code because the timer is
strictlty per CPU, initialized as pinned and all operations which arm the
timer happen on the CPU to which the timer belongs.

Simplify the whole machinery by using mod_timer() instead of add_timer_on()
which avoids the problem because mod_timer() can handle already queued
timers. Use __start_timer() everywhere so the earliest armed expiry time is
preserved.

Reported-by: Erik Veijola &lt;erik.veijola@intel.com&gt;
Tested-by: Borislav Petkov &lt;bp@alien8.de&gt;
Signed-off-by: Thomas Gleixner &lt;tglx@linutronix.de&gt;
Reviewed-by: Borislav Petkov &lt;bp@alien8.de&gt;
Cc: Tony Luck &lt;tony.luck@intel.com&gt;
Link: http://lkml.kernel.org/r/alpine.DEB.2.20.1701310936080.3457@nanos
Signed-off-by: Thomas Gleixner &lt;tglx@linutronix.de&gt;

</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=0becc0ae5b42828785b589f686725ff5bc3b9b25'>Diffstat</a> (limited to 'sound/soc/codecs/wm8804-spi.c')</div><table summary='diffstat' class='diffstat'>