This patch add support to multiplexed smbus for proliant microserver
N36L and may be applicable to other configuration based on sb8xx
southbus.
root@proliant:/usr/src/lm-sensors/eddi# i2cdetect -l
i2c-0 smbus SMBus piix4 adapter (SDA0) SMBus adapter
i2c-1 smbus SMBus piix4 adapter (SDA2) SMBus adapter
i2c-2 smbus SMBus piix4 adapter (SDA3) SMBus adapter
i2c-3 smbus SMBus piix4 adapter (SDA4) SMBus adapter
root@proliant:/usr/src/lm-sensors/eddi#
yes SDA1 is reserved... so i can't multiplex it
root@proliant:/usr/src/lm-sensors/eddi# sensors
k10temp-pci-00c3
Adapter: PCI adapter
temp1: +24.5°C (high = +70.0°C, crit = +100.0°C)
w83795adg-i2c-1-2f
Adapter: SMBus piix4 adapter (SDA2)
in0: +1.02 V (min = +0.00 V, max = +2.05 V)
in1: +1.52 V (min = +0.00 V, max = +2.05 V)
in2: +1.10 V (min = +0.00 V, max = +2.05 V)
in3: +0.89 V (min = +0.00 V, max = +2.05 V)
in12: +3.35 V (min = +0.00 V, max = +6.14 V)
in13: +3.28 V (min = +0.00 V, max = +6.14 V)
fan1: 703 RPM (min = 329 RPM)
temp1: +23.0°C (high = +109.0°C, hyst = +109.0°C)
(crit = +109.0°C, hyst = +109.0°C) sensor = thermal diode
temp2: +33.2°C (high = +105.0°C, hyst = +105.0°C)
(crit = +105.0°C, hyst = +105.0°C) sensor = thermal diode
temp5: +14.0°C (high = +39.0°C, hyst = +39.0°C)
(crit = +44.0°C, hyst = +44.0°C) sensor = thermistor
beep_enable:disabled
jc42-i2c-0-18
Adapter: SMBus piix4 adapter (SDA0)
temp1: +20.5°C (low = +0.0°C, high = +0.0°C) ALARM
(crit = +0.0°C, hyst = +0.0°C) ALARM
root@proliant:/usr/src/lm-sensors/eddi# i2cdetect -y 0
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- UU -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: 50 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
root@proliant:/usr/src/lm-sensors/eddi# i2cdetect -y 1
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- UU
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- 61 -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
root@proliant:/usr/src/lm-sensors/eddi# i2cdetect -y 2
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- 4c -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
root@proliant:/usr/src/lm-sensors/eddi# i2cdetect -y 3
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
pay attention that the msleep seems to be really needed...
Signed-off-by: Eddi De Pieri <eddi@xxxxxxxxxxx>
Regards,
Eddi
follows patch....
diff -u -N -r 2.6.32.orig/i2c-piix4.c 2.6.32/i2c-piix4.c
--- 2.6.32.orig/i2c-piix4.c 2011-11-16 17:07:03.000000000 +0100
+++ 2.6.32/i2c-piix4.c 2011-11-16 15:21:17.000000000 +0100
@@ -97,7 +97,8 @@
static unsigned short piix4_smba;
static int srvrworks_csb5_delay;
static struct pci_driver piix4_driver;
-static struct i2c_adapter piix4_adapter;
+struct i2c_adapter piix4_adapter;
+EXPORT_SYMBOL_GPL(piix4_adapter);
static struct dmi_system_id __devinitdata piix4_dmi_blacklist[] = {
{
@@ -246,10 +247,22 @@
"0x%x already in use!\n", smba_idx);
return -EBUSY;
}
- outb_p(smb_en, smba_idx);
- smba_en_lo = inb_p(smba_idx + 1);
- outb_p(smb_en + 1, smba_idx);
- smba_en_hi = inb_p(smba_idx + 1);
+ outb_p(smb_en, smba_idx); //seleziono il registro 0x2c
+ smba_en_lo = inb_p(smba_idx + 1); //leggo il dato L del registro 0x2c
+ outb_p(smb_en + 1, smba_idx); //seleziono il registro 0x2c + 1
+ smba_en_hi = inb_p(smba_idx + 1); //leggo il dato H del registro 0x2c
+
+ outb_p(smb_en, smba_idx); //seleziono il registro 0x2c
+ outb_p(smba_en_lo & 0xF9 , smba_idx + 1); //seleziono la porta 0 00 0
+ outb_p(smb_en + 1, smba_idx); //seleziono il registro 0x2c + 1
+ outb_p(smba_en_hi, smba_idx + 1);
+
+ outb_p(smb_en, smba_idx); //seleziono il registro 0x2c
+ smba_en_lo = inb_p(smba_idx + 1); //leggo il dato L del registro 0x2c
+ outb_p(smb_en + 1, smba_idx); //seleziono il registro 0x2c + 1
+ smba_en_hi = inb_p(smba_idx + 1); //leggo il dato H del registro 0x2c
+
+
release_region(smba_idx, 2);
if ((smba_en_lo & 1) == 0) {
@@ -258,6 +271,8 @@
return -ENODEV;
}
+ dev_info(&PIIX4_dev->dev,"Selected Default Smbus Port 0x%x",
(smba_en_lo & 0x6) >> 1);
+
piix4_smba = ((smba_en_hi << 8) | smba_en_lo) & 0xffe0;
if (acpi_check_region(piix4_smba, SMBIOSIZE, piix4_driver.name))
return -ENODEV;
@@ -466,7 +481,7 @@
.functionality = piix4_func,
};
-static struct i2c_adapter piix4_adapter = {
+struct i2c_adapter piix4_adapter = {
.owner = THIS_MODULE,
.class = I2C_CLASS_HWMON | I2C_CLASS_SPD,
.algo = &smbus_algorithm,
diff -u -N -r 2.6.32.orig/i2c-piix4-n36l.c 2.6.32/i2c-piix4-n36l.c
--- 2.6.32.orig/i2c-piix4-n36l.c 1970-01-01 01:00:00.000000000 +0100
+++ 2.6.32/i2c-piix4-n36l.c 2011-11-16 16:02:01.000000000 +0100
@@ -0,0 +1,247 @@
+/*
+ * i2c-piix4-n36l.c - i2c-piix4 extras for the HP proliant
microserver n36l motherboard
+ *
+ * Copyright (C) 2004, 2008 Jean Delvare <khali@xxxxxxxxxxxx>
+ * Copyright (C) 2011 Eddi De Pieri <eddi@xxxxxxxxxxx>
+ *
+ * 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; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+/*
+ * We select the channels by sending commands to the sb800 southbus
+ * the selection bit
+ * http://support.amd.com/us/Embedded_TechDocs/45482.pdf
+ * Smbus0En - RW – 16 bits - [PM_Reg: 2Ch]
+ * Field Name Bits Default Description
+ * SmBus0En 0 0b Set to 1 to enable SMBUS0 function and decoding.
+ * SmBus0Sel 2:1 00b SmBus port selection when PM_Reg 2Fh bit 0 is set to 0
+ * 00: Port 0
+ * 01: Port 2
+ * 10: Port 3
+ * 11: Port 4
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/i2c.h>
+#include <linux/mutex.h>
+#include <asm/io.h>
+
+extern struct i2c_adapter piix4_adapter;
+
+static struct i2c_adapter *n36l_adapter;
+static struct i2c_algorithm *n36l_algo;
+
+/* Wrapper access functions for multiplexed SMBus */
+static DEFINE_MUTEX(piix4_lock);
+
+/* We remember the last used channels combination so as to only switch
+ channels when it is really needed. This greatly reduces the SMBus
+ overhead, but also assumes that nobody will be writing to the PCA9556
+ in our back. */
+static u8 last_channels;
+
+static inline s32 piix4_access_channel(struct i2c_adapter * adap, u16 addr,
+ unsigned short flags, char read_write,
+ u8 command, int size,
+ union i2c_smbus_data * data,
+ u8 channels)
+{
+ int error;
+ unsigned short smba_idx = 0xcd6;
+ u8 smba_en_lo, smba_en_hi, smb_en = 0x2c;
+
+ mutex_lock(&piix4_lock);
+
+ if (last_channels != channels) {
+ union i2c_smbus_data mplxdata;
+ mplxdata.byte = channels;
+
+ /* Determine the address of the SMBus areas */
+ if (!request_region(smba_idx, 2, "smba_idx")) {
+ dev_err(&piix4_adapter.dev, "SMBus base address index region "
+ "0x%x already in use!\n", smba_idx);
+ return -EBUSY;
+ }
+
+ outb_p(smb_en, smba_idx); //seleziono il registro 0x2c
+ smba_en_lo = inb_p(smba_idx + 1); //leggo il dato L del registro 0x2c
+ outb_p(smb_en + 1, smba_idx); //seleziono il registro 0x2c + 1
+ smba_en_hi = inb_p(smba_idx + 1); //leggo il dato H del registro 0x2c
+
+ msleep(50);
+ outb_p(smb_en, smba_idx); //seleziono il registro 0x2c
+ outb_p((smba_en_lo & 0xF9 )+ ( channels << 1) , smba_idx + 1);
//seleziono la porta 0 00 0
+ outb_p(smb_en + 1, smba_idx); //seleziono il registro 0x2c + 1
+ outb_p(smba_en_hi, smba_idx + 1);
+
+ msleep(50);
+
+ release_region(smba_idx, 2);
+
+ dev_info(&piix4_adapter.dev,"Selected Smbus Port 0x%x", (smba_en_lo
& 0x6) >> 1);
+
+ last_channels = channels;
+
+ }
+
+ error = piix4_adapter.algo->smbus_xfer(adap, addr, flags, read_write,
+ command, size, data);
+
+
+ mutex_unlock(&piix4_lock);
+ return error;
+}
+
+static s32 piix4_access_virt0(struct i2c_adapter * adap, u16 addr,
+ unsigned short flags, char read_write,
+ u8 command, int size,
+ union i2c_smbus_data * data)
+{
+ return piix4_access_channel(adap, addr, flags, read_write, command,
+ size, data, 0);
+}
+
+static s32 piix4_access_virt1(struct i2c_adapter * adap, u16 addr,
+ unsigned short flags, char read_write,
+ u8 command, int size,
+ union i2c_smbus_data * data)
+{
+ return piix4_access_channel(adap, addr, flags, read_write, command,
+ size, data, 1);
+}
+
+static s32 piix4_access_virt2(struct i2c_adapter * adap, u16 addr,
+ unsigned short flags, char read_write,
+ u8 command, int size,
+ union i2c_smbus_data * data)
+{
+ return piix4_access_channel(adap, addr, flags, read_write, command,
+ size, data, 2);
+}
+
+static s32 piix4_access_virt3(struct i2c_adapter * adap, u16 addr,
+ unsigned short flags, char read_write,
+ u8 command, int size,
+ union i2c_smbus_data * data)
+{
+ return piix4_access_channel(adap, addr, flags, read_write, command,
+ size, data, 3);
+}
+
+static int __init piix4_n36l_init(void)
+{
+ int i, error;
+
+ if (!piix4_adapter.dev.parent)
+ return -ENODEV;
+
+ printk(KERN_INFO "Configure the AMD SB800 Multiplexer\n");
+
+ /* Unregister physical bus */
+ error = i2c_del_adapter(&piix4_adapter);
+ if (error) {
+ dev_err(&piix4_adapter.dev, "Physical bus removal failed\n");
+ goto ERROR0;
+ }
+
+ printk(KERN_INFO "Enabling SMBus multiplexing for Hp Proliant
Microserver N36l\n");
+ /* Define the 4 virtual adapters and algorithms structures */
+ if (!(n36l_adapter = kzalloc(5 * sizeof(struct i2c_adapter),
+ GFP_KERNEL))) {
+ error = -ENOMEM;
+ goto ERROR1;
+ }
+ if (!(n36l_algo = kzalloc(5 * sizeof(struct i2c_algorithm),
+ GFP_KERNEL))) {
+ error = -ENOMEM;
+ goto ERROR2;
+ }
+
+ /* Fill in the new structures */
+ n36l_algo[0] = *(piix4_adapter.algo);
+ n36l_algo[0].smbus_xfer = piix4_access_virt0;
+ n36l_adapter[0] = piix4_adapter;
+ snprintf(n36l_adapter[0].name, sizeof(n36l_adapter[0].name),
+ "SMBus piix4 adapter (SDA0)");
+ n36l_adapter[0].algo = n36l_algo;
+ n36l_adapter[0].dev.parent = piix4_adapter.dev.parent;
+ for (i = 1; i < 4; i++) {
+ n36l_algo[i] = *(piix4_adapter.algo);
+ n36l_adapter[i] = piix4_adapter;
+ snprintf(n36l_adapter[i].name, sizeof(n36l_adapter[i].name),
+ "SMBus piix4 adapter (SDA%d)", i + 1);
+ n36l_adapter[i].algo = n36l_algo+i;
+ n36l_adapter[i].dev.parent = piix4_adapter.dev.parent;
+ }
+ n36l_algo[1].smbus_xfer = piix4_access_virt1;
+ n36l_algo[2].smbus_xfer = piix4_access_virt2;
+ n36l_algo[3].smbus_xfer = piix4_access_virt3;
+
+ /* Register virtual adapters */
+ for (i = 0; i < 4; i++) {
+ error = i2c_add_adapter(n36l_adapter+i);
+ if (error) {
+ printk(KERN_ERR "i2c-piix4-n36l: "
+ "Virtual adapter %d registration "
+ "failed, module not inserted\n", i);
+ for (i--; i >= 0; i--)
+ i2c_del_adapter(n36l_adapter+i);
+ goto ERROR3;
+ }
+ }
+
+ return 0;
+
+ERROR3:
+ kfree(n36l_algo);
+ n36l_algo = NULL;
+ERROR2:
+ kfree(n36l_adapter);
+ n36l_adapter = NULL;
+ERROR1:
+ /* Restore physical bus */
+ i2c_add_adapter(&piix4_adapter);
+ERROR0:
+ return error;
+}
+
+static void __exit piix4_n36l_exit(void)
+{
+ if (n36l_adapter) {
+ int i;
+
+ for (i = 0; i < 5; i++)
+ i2c_del_adapter(n36l_adapter+i);
+ kfree(n36l_adapter);
+ n36l_adapter = NULL;
+ }
+ kfree(n36l_algo);
+ n36l_algo = NULL;
+
+ /* Restore physical bus */
+ if (i2c_add_adapter(&piix4_adapter))
+ printk(KERN_ERR "i2c-piix4-n36l: "
+ "Physical bus restoration failed\n");
+}
+
+MODULE_AUTHOR("Eddi De Pieri <eddi@xxxxxxxxxxx");
+MODULE_DESCRIPTION("n36l SMBus multiplexing");
+MODULE_LICENSE("GPL");
+
+module_init(piix4_n36l_init);
+module_exit(piix4_n36l_exit);
On Sun, Nov 27, 2011 at 11:55 PM, Ben Dooks <ben-i2c@xxxxxxxxx> wrote:
>
> On Fri, Nov 25, 2011 at 11:07:21PM +0100, Eddi De Pieri wrote:
>> This patch add support to multiplexed smbus for proliant microserver
>> N36L and may be applicable to other configuration based on sb8xx
>> southbus.
>>
>> root@proliant:/usr/src/lm-sensors/eddi# i2cdetect -l
>> i2c-0 smbus SMBus piix4 adapter (SDA0) SMBus adapter
>> i2c-1 smbus SMBus piix4 adapter (SDA2) SMBus adapter
>> i2c-2 smbus SMBus piix4 adapter (SDA3) SMBus adapter
>> i2c-3 smbus SMBus piix4 adapter (SDA4) SMBus adapter
>> root@proliant:/usr/src/lm-sensors/eddi#
>
> patch should go inline so it can be reviewed, thanks.
>
> --
> Ben Dooks, ben@xxxxxxxxx, http://www.fluff.org/ben/
>
> Large Hadron Colada: A large Pina Colada that makes the universe disappear.
>
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