mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-15 09:46:46 +07:00
f607e7fc5f
This fixes a regression in 3.0 reported by Paul Parsons regarding the removal of the msleep(1) in the ds1wm_reset() function: : The linux-3.0-rc4 DS1WM 1-wire driver is logging "bus error, retrying" : error messages on an HP iPAQ hx4700 PDA (XScale-PXA270): : : <snip> : Driver for 1-wire Dallas network protocol. : DS1WM w1 busmaster driver - (c) 2004 Szabolcs Gyurko : 1-Wire driver for the DS2760 battery monitor chip - (c) 2004-2005, Szabolcs Gyurko : ds1wm ds1wm: pass: 1 bus error, retrying : ds1wm ds1wm: pass: 2 bus error, retrying : ds1wm ds1wm: pass: 3 bus error, retrying : ds1wm ds1wm: pass: 4 bus error, retrying : ds1wm ds1wm: pass: 5 bus error, retrying : ... : : The visible result is that the battery charging LED is erratic; sometimes : it works, mostly it doesn't. : : The linux-2.6.39 DS1WM 1-wire driver worked OK. I haven't tried 3.0-rc1, : 3.0-rc2, or 3.0-rc3. This sleep should not be required on normal circuitry provided the pull-ups on the bus are correctly adapted to the slaves. Unfortunately, this is not always the case. The sleep is restored but as a parameter to the probe function in the pdata. [akpm@linux-foundation.org: coding-style fixes] Reported-by: Paul Parsons <lost.distance@yahoo.com> Tested-by: Paul Parsons <lost.distance@yahoo.com> Signed-off-by: Jean-François Dagenais <dagenaisj@sonatest.com> Cc: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
226 lines
5.2 KiB
C
226 lines
5.2 KiB
C
/*
|
|
* Core driver for HTC PASIC3 LED/DS1WM chip.
|
|
*
|
|
* Copyright (C) 2006 Philipp Zabel <philipp.zabel@gmail.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; version 2 of the License.
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/platform_device.h>
|
|
|
|
#include <linux/gpio.h>
|
|
#include <linux/io.h>
|
|
#include <linux/irq.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/mfd/core.h>
|
|
#include <linux/mfd/ds1wm.h>
|
|
#include <linux/mfd/htc-pasic3.h>
|
|
#include <linux/slab.h>
|
|
|
|
struct pasic3_data {
|
|
void __iomem *mapping;
|
|
unsigned int bus_shift;
|
|
};
|
|
|
|
#define REG_ADDR 5
|
|
#define REG_DATA 6
|
|
|
|
#define READ_MODE 0x80
|
|
|
|
/*
|
|
* write to a secondary register on the PASIC3
|
|
*/
|
|
void pasic3_write_register(struct device *dev, u32 reg, u8 val)
|
|
{
|
|
struct pasic3_data *asic = dev_get_drvdata(dev);
|
|
int bus_shift = asic->bus_shift;
|
|
void __iomem *addr = asic->mapping + (REG_ADDR << bus_shift);
|
|
void __iomem *data = asic->mapping + (REG_DATA << bus_shift);
|
|
|
|
__raw_writeb(~READ_MODE & reg, addr);
|
|
__raw_writeb(val, data);
|
|
}
|
|
EXPORT_SYMBOL(pasic3_write_register); /* for leds-pasic3 */
|
|
|
|
/*
|
|
* read from a secondary register on the PASIC3
|
|
*/
|
|
u8 pasic3_read_register(struct device *dev, u32 reg)
|
|
{
|
|
struct pasic3_data *asic = dev_get_drvdata(dev);
|
|
int bus_shift = asic->bus_shift;
|
|
void __iomem *addr = asic->mapping + (REG_ADDR << bus_shift);
|
|
void __iomem *data = asic->mapping + (REG_DATA << bus_shift);
|
|
|
|
__raw_writeb(READ_MODE | reg, addr);
|
|
return __raw_readb(data);
|
|
}
|
|
EXPORT_SYMBOL(pasic3_read_register); /* for leds-pasic3 */
|
|
|
|
/*
|
|
* LEDs
|
|
*/
|
|
|
|
static struct mfd_cell led_cell __initdata = {
|
|
.name = "leds-pasic3",
|
|
};
|
|
|
|
/*
|
|
* DS1WM
|
|
*/
|
|
|
|
static int ds1wm_enable(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = pdev->dev.parent;
|
|
int c;
|
|
|
|
c = pasic3_read_register(dev, 0x28);
|
|
pasic3_write_register(dev, 0x28, c & 0x7f);
|
|
|
|
dev_dbg(dev, "DS1WM OWM_EN low (active) %02x\n", c & 0x7f);
|
|
return 0;
|
|
}
|
|
|
|
static int ds1wm_disable(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = pdev->dev.parent;
|
|
int c;
|
|
|
|
c = pasic3_read_register(dev, 0x28);
|
|
pasic3_write_register(dev, 0x28, c | 0x80);
|
|
|
|
dev_dbg(dev, "DS1WM OWM_EN high (inactive) %02x\n", c | 0x80);
|
|
return 0;
|
|
}
|
|
|
|
static struct ds1wm_driver_data ds1wm_pdata = {
|
|
.active_high = 0,
|
|
.reset_recover_delay = 1,
|
|
};
|
|
|
|
static struct resource ds1wm_resources[] __initdata = {
|
|
[0] = {
|
|
.start = 0,
|
|
.flags = IORESOURCE_MEM,
|
|
},
|
|
[1] = {
|
|
.start = 0,
|
|
.end = 0,
|
|
.flags = IORESOURCE_IRQ,
|
|
},
|
|
};
|
|
|
|
static struct mfd_cell ds1wm_cell __initdata = {
|
|
.name = "ds1wm",
|
|
.enable = ds1wm_enable,
|
|
.disable = ds1wm_disable,
|
|
.platform_data = &ds1wm_pdata,
|
|
.pdata_size = sizeof(ds1wm_pdata),
|
|
.num_resources = 2,
|
|
.resources = ds1wm_resources,
|
|
};
|
|
|
|
static int __init pasic3_probe(struct platform_device *pdev)
|
|
{
|
|
struct pasic3_platform_data *pdata = pdev->dev.platform_data;
|
|
struct device *dev = &pdev->dev;
|
|
struct pasic3_data *asic;
|
|
struct resource *r;
|
|
int ret;
|
|
int irq = 0;
|
|
|
|
r = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
|
|
if (r) {
|
|
ds1wm_resources[1].flags = IORESOURCE_IRQ | (r->flags &
|
|
(IORESOURCE_IRQ_HIGHEDGE | IORESOURCE_IRQ_LOWEDGE));
|
|
irq = r->start;
|
|
}
|
|
|
|
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
if (!r)
|
|
return -ENXIO;
|
|
|
|
if (!request_mem_region(r->start, resource_size(r), "pasic3"))
|
|
return -EBUSY;
|
|
|
|
asic = kzalloc(sizeof(struct pasic3_data), GFP_KERNEL);
|
|
if (!asic)
|
|
return -ENOMEM;
|
|
|
|
platform_set_drvdata(pdev, asic);
|
|
|
|
asic->mapping = ioremap(r->start, resource_size(r));
|
|
if (!asic->mapping) {
|
|
dev_err(dev, "couldn't ioremap PASIC3\n");
|
|
kfree(asic);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/* calculate bus shift from mem resource */
|
|
asic->bus_shift = (resource_size(r) - 5) >> 3;
|
|
|
|
if (pdata && pdata->clock_rate) {
|
|
ds1wm_pdata.clock_rate = pdata->clock_rate;
|
|
/* the first 5 PASIC3 registers control the DS1WM */
|
|
ds1wm_resources[0].end = (5 << asic->bus_shift) - 1;
|
|
ret = mfd_add_devices(&pdev->dev, pdev->id,
|
|
&ds1wm_cell, 1, r, irq);
|
|
if (ret < 0)
|
|
dev_warn(dev, "failed to register DS1WM\n");
|
|
}
|
|
|
|
if (pdata && pdata->led_pdata) {
|
|
led_cell.platform_data = pdata->led_pdata;
|
|
led_cell.pdata_size = sizeof(struct pasic3_leds_machinfo);
|
|
ret = mfd_add_devices(&pdev->dev, pdev->id, &led_cell, 1, r, 0);
|
|
if (ret < 0)
|
|
dev_warn(dev, "failed to register LED device\n");
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pasic3_remove(struct platform_device *pdev)
|
|
{
|
|
struct pasic3_data *asic = platform_get_drvdata(pdev);
|
|
struct resource *r;
|
|
|
|
mfd_remove_devices(&pdev->dev);
|
|
|
|
iounmap(asic->mapping);
|
|
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
release_mem_region(r->start, resource_size(r));
|
|
kfree(asic);
|
|
return 0;
|
|
}
|
|
|
|
MODULE_ALIAS("platform:pasic3");
|
|
|
|
static struct platform_driver pasic3_driver = {
|
|
.driver = {
|
|
.name = "pasic3",
|
|
},
|
|
.remove = pasic3_remove,
|
|
};
|
|
|
|
static int __init pasic3_base_init(void)
|
|
{
|
|
return platform_driver_probe(&pasic3_driver, pasic3_probe);
|
|
}
|
|
|
|
static void __exit pasic3_base_exit(void)
|
|
{
|
|
platform_driver_unregister(&pasic3_driver);
|
|
}
|
|
|
|
module_init(pasic3_base_init);
|
|
module_exit(pasic3_base_exit);
|
|
|
|
MODULE_AUTHOR("Philipp Zabel <philipp.zabel@gmail.com>");
|
|
MODULE_DESCRIPTION("Core driver for HTC PASIC3");
|
|
MODULE_LICENSE("GPL");
|