1139 lines
30 KiB
C
1139 lines
30 KiB
C
/* envctrl.c: Temperature and Fan monitoring on Machines providing it.
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*
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* Copyright (C) 1998 Eddie C. Dost (ecd@skynet.be)
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* Copyright (C) 2000 Vinh Truong (vinh.truong@eng.sun.com)
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* VT - The implementation is to support Sun Microelectronics (SME) platform
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* environment monitoring. SME platforms use pcf8584 as the i2c bus
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* controller to access pcf8591 (8-bit A/D and D/A converter) and
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* pcf8571 (256 x 8-bit static low-voltage RAM with I2C-bus interface).
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* At board level, it follows SME Firmware I2C Specification. Reference:
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* http://www-eu2.semiconductors.com/pip/PCF8584P
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* http://www-eu2.semiconductors.com/pip/PCF8574AP
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* http://www-eu2.semiconductors.com/pip/PCF8591P
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*
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* EB - Added support for CP1500 Global Address and PS/Voltage monitoring.
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* Eric Brower <ebrower@usa.net>
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*
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* DB - Audit every copy_to_user in envctrl_read.
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* Daniele Bellucci <bellucda@tiscali.it>
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*/
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#include <linux/module.h>
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#include <linux/kthread.h>
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#include <linux/delay.h>
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#include <linux/ioport.h>
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#include <linux/miscdevice.h>
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#include <linux/kmod.h>
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#include <linux/reboot.h>
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#include <linux/slab.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/uaccess.h>
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#include <asm/envctrl.h>
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#include <asm/io.h>
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#define DRIVER_NAME "envctrl"
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#define PFX DRIVER_NAME ": "
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#define ENVCTRL_MINOR 162
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#define PCF8584_ADDRESS 0x55
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#define CONTROL_PIN 0x80
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#define CONTROL_ES0 0x40
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#define CONTROL_ES1 0x20
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#define CONTROL_ES2 0x10
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#define CONTROL_ENI 0x08
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#define CONTROL_STA 0x04
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#define CONTROL_STO 0x02
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#define CONTROL_ACK 0x01
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#define STATUS_PIN 0x80
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#define STATUS_STS 0x20
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#define STATUS_BER 0x10
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#define STATUS_LRB 0x08
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#define STATUS_AD0 0x08
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#define STATUS_AAB 0x04
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#define STATUS_LAB 0x02
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#define STATUS_BB 0x01
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/*
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* CLK Mode Register.
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*/
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#define BUS_CLK_90 0x00
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#define BUS_CLK_45 0x01
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#define BUS_CLK_11 0x02
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#define BUS_CLK_1_5 0x03
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#define CLK_3 0x00
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#define CLK_4_43 0x10
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#define CLK_6 0x14
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#define CLK_8 0x18
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#define CLK_12 0x1c
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#define OBD_SEND_START 0xc5 /* value to generate I2c_bus START condition */
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#define OBD_SEND_STOP 0xc3 /* value to generate I2c_bus STOP condition */
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/* Monitor type of i2c child device.
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* Firmware definitions.
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*/
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#define PCF8584_MAX_CHANNELS 8
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#define PCF8584_GLOBALADDR_TYPE 6 /* global address monitor */
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#define PCF8584_FANSTAT_TYPE 3 /* fan status monitor */
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#define PCF8584_VOLTAGE_TYPE 2 /* voltage monitor */
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#define PCF8584_TEMP_TYPE 1 /* temperature monitor*/
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/* Monitor type of i2c child device.
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* Driver definitions.
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*/
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#define ENVCTRL_NOMON 0
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#define ENVCTRL_CPUTEMP_MON 1 /* cpu temperature monitor */
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#define ENVCTRL_CPUVOLTAGE_MON 2 /* voltage monitor */
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#define ENVCTRL_FANSTAT_MON 3 /* fan status monitor */
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#define ENVCTRL_ETHERTEMP_MON 4 /* ethernet temperature */
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/* monitor */
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#define ENVCTRL_VOLTAGESTAT_MON 5 /* voltage status monitor */
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#define ENVCTRL_MTHRBDTEMP_MON 6 /* motherboard temperature */
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#define ENVCTRL_SCSITEMP_MON 7 /* scsi temperature */
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#define ENVCTRL_GLOBALADDR_MON 8 /* global address */
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/* Child device type.
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* Driver definitions.
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*/
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#define I2C_ADC 0 /* pcf8591 */
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#define I2C_GPIO 1 /* pcf8571 */
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/* Data read from child device may need to decode
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* through a data table and a scale.
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* Translation type as defined by firmware.
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*/
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#define ENVCTRL_TRANSLATE_NO 0
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#define ENVCTRL_TRANSLATE_PARTIAL 1
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#define ENVCTRL_TRANSLATE_COMBINED 2
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#define ENVCTRL_TRANSLATE_FULL 3 /* table[data] */
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#define ENVCTRL_TRANSLATE_SCALE 4 /* table[data]/scale */
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/* Driver miscellaneous definitions. */
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#define ENVCTRL_MAX_CPU 4
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#define CHANNEL_DESC_SZ 256
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/* Mask values for combined GlobalAddress/PowerStatus node */
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#define ENVCTRL_GLOBALADDR_ADDR_MASK 0x1F
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#define ENVCTRL_GLOBALADDR_PSTAT_MASK 0x60
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/* Node 0x70 ignored on CompactPCI CP1400/1500 platforms
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* (see envctrl_init_i2c_child)
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*/
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#define ENVCTRL_CPCI_IGNORED_NODE 0x70
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#define PCF8584_DATA 0x00
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#define PCF8584_CSR 0x01
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/* Each child device can be monitored by up to PCF8584_MAX_CHANNELS.
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* Property of a port or channel as defined by the firmware.
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*/
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struct pcf8584_channel {
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unsigned char chnl_no;
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unsigned char io_direction;
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unsigned char type;
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unsigned char last;
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};
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/* Each child device may have one or more tables of bytes to help decode
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* data. Table property as defined by the firmware.
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*/
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struct pcf8584_tblprop {
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unsigned int type;
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unsigned int scale;
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unsigned int offset; /* offset from the beginning of the table */
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unsigned int size;
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};
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/* i2c child */
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struct i2c_child_t {
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/* Either ADC or GPIO. */
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unsigned char i2ctype;
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unsigned long addr;
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struct pcf8584_channel chnl_array[PCF8584_MAX_CHANNELS];
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/* Channel info. */
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unsigned int total_chnls; /* Number of monitor channels. */
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unsigned char fan_mask; /* Byte mask for fan status channels. */
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unsigned char voltage_mask; /* Byte mask for voltage status channels. */
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struct pcf8584_tblprop tblprop_array[PCF8584_MAX_CHANNELS];
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/* Properties of all monitor channels. */
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unsigned int total_tbls; /* Number of monitor tables. */
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char *tables; /* Pointer to table(s). */
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char chnls_desc[CHANNEL_DESC_SZ]; /* Channel description. */
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char mon_type[PCF8584_MAX_CHANNELS];
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};
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static void __iomem *i2c;
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static struct i2c_child_t i2c_childlist[ENVCTRL_MAX_CPU*2];
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static unsigned char chnls_mask[] = { 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80 };
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static unsigned int warning_temperature = 0;
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static unsigned int shutdown_temperature = 0;
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static char read_cpu;
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/* Forward declarations. */
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static struct i2c_child_t *envctrl_get_i2c_child(unsigned char);
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/* Function Description: Test the PIN bit (Pending Interrupt Not)
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* to test when serial transmission is completed .
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* Return : None.
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*/
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static void envtrl_i2c_test_pin(void)
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{
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int limit = 1000000;
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while (--limit > 0) {
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if (!(readb(i2c + PCF8584_CSR) & STATUS_PIN))
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break;
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udelay(1);
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}
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if (limit <= 0)
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printk(KERN_INFO PFX "Pin status will not clear.\n");
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}
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/* Function Description: Test busy bit.
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* Return : None.
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*/
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static void envctrl_i2c_test_bb(void)
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{
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int limit = 1000000;
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while (--limit > 0) {
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/* Busy bit 0 means busy. */
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if (readb(i2c + PCF8584_CSR) & STATUS_BB)
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break;
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udelay(1);
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}
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if (limit <= 0)
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printk(KERN_INFO PFX "Busy bit will not clear.\n");
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}
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/* Function Description: Send the address for a read access.
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* Return : 0 if not acknowledged, otherwise acknowledged.
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*/
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static int envctrl_i2c_read_addr(unsigned char addr)
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{
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envctrl_i2c_test_bb();
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/* Load address. */
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writeb(addr + 1, i2c + PCF8584_DATA);
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envctrl_i2c_test_bb();
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writeb(OBD_SEND_START, i2c + PCF8584_CSR);
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/* Wait for PIN. */
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envtrl_i2c_test_pin();
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/* CSR 0 means acknowledged. */
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if (!(readb(i2c + PCF8584_CSR) & STATUS_LRB)) {
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return readb(i2c + PCF8584_DATA);
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} else {
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writeb(OBD_SEND_STOP, i2c + PCF8584_CSR);
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return 0;
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}
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}
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/* Function Description: Send the address for write mode.
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* Return : None.
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*/
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static void envctrl_i2c_write_addr(unsigned char addr)
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{
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envctrl_i2c_test_bb();
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writeb(addr, i2c + PCF8584_DATA);
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/* Generate Start condition. */
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writeb(OBD_SEND_START, i2c + PCF8584_CSR);
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}
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/* Function Description: Read 1 byte of data from addr
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* set by envctrl_i2c_read_addr()
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* Return : Data from address set by envctrl_i2c_read_addr().
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*/
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static unsigned char envctrl_i2c_read_data(void)
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{
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envtrl_i2c_test_pin();
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writeb(CONTROL_ES0, i2c + PCF8584_CSR); /* Send neg ack. */
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return readb(i2c + PCF8584_DATA);
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}
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/* Function Description: Instruct the device which port to read data from.
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* Return : None.
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*/
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static void envctrl_i2c_write_data(unsigned char port)
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{
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envtrl_i2c_test_pin();
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writeb(port, i2c + PCF8584_DATA);
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}
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/* Function Description: Generate Stop condition after last byte is sent.
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* Return : None.
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*/
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static void envctrl_i2c_stop(void)
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{
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envtrl_i2c_test_pin();
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writeb(OBD_SEND_STOP, i2c + PCF8584_CSR);
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}
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/* Function Description: Read adc device.
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* Return : Data at address and port.
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*/
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static unsigned char envctrl_i2c_read_8591(unsigned char addr, unsigned char port)
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{
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/* Send address. */
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envctrl_i2c_write_addr(addr);
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/* Setup port to read. */
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envctrl_i2c_write_data(port);
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envctrl_i2c_stop();
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/* Read port. */
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envctrl_i2c_read_addr(addr);
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/* Do a single byte read and send stop. */
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envctrl_i2c_read_data();
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envctrl_i2c_stop();
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return readb(i2c + PCF8584_DATA);
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}
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/* Function Description: Read gpio device.
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* Return : Data at address.
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*/
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static unsigned char envctrl_i2c_read_8574(unsigned char addr)
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{
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unsigned char rd;
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envctrl_i2c_read_addr(addr);
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/* Do a single byte read and send stop. */
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rd = envctrl_i2c_read_data();
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envctrl_i2c_stop();
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return rd;
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}
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/* Function Description: Decode data read from an adc device using firmware
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* table.
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* Return: Number of read bytes. Data is stored in bufdata in ascii format.
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*/
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static int envctrl_i2c_data_translate(unsigned char data, int translate_type,
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int scale, char *tbl, char *bufdata)
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{
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int len = 0;
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switch (translate_type) {
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case ENVCTRL_TRANSLATE_NO:
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/* No decode necessary. */
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len = 1;
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bufdata[0] = data;
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break;
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case ENVCTRL_TRANSLATE_FULL:
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/* Decode this way: data = table[data]. */
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len = 1;
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bufdata[0] = tbl[data];
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break;
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case ENVCTRL_TRANSLATE_SCALE:
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/* Decode this way: data = table[data]/scale */
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sprintf(bufdata,"%d ", (tbl[data] * 10) / (scale));
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len = strlen(bufdata);
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bufdata[len - 1] = bufdata[len - 2];
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bufdata[len - 2] = '.';
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break;
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default:
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break;
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}
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return len;
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}
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/* Function Description: Read cpu-related data such as cpu temperature, voltage.
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* Return: Number of read bytes. Data is stored in bufdata in ascii format.
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*/
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static int envctrl_read_cpu_info(int cpu, struct i2c_child_t *pchild,
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char mon_type, unsigned char *bufdata)
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{
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unsigned char data;
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int i;
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char *tbl, j = -1;
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/* Find the right monitor type and channel. */
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for (i = 0; i < PCF8584_MAX_CHANNELS; i++) {
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if (pchild->mon_type[i] == mon_type) {
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if (++j == cpu) {
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break;
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}
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}
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}
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if (j != cpu)
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return 0;
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/* Read data from address and port. */
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data = envctrl_i2c_read_8591((unsigned char)pchild->addr,
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(unsigned char)pchild->chnl_array[i].chnl_no);
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/* Find decoding table. */
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tbl = pchild->tables + pchild->tblprop_array[i].offset;
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return envctrl_i2c_data_translate(data, pchild->tblprop_array[i].type,
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pchild->tblprop_array[i].scale,
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tbl, bufdata);
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}
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/* Function Description: Read noncpu-related data such as motherboard
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* temperature.
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* Return: Number of read bytes. Data is stored in bufdata in ascii format.
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*/
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static int envctrl_read_noncpu_info(struct i2c_child_t *pchild,
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char mon_type, unsigned char *bufdata)
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{
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unsigned char data;
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int i;
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char *tbl = NULL;
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for (i = 0; i < PCF8584_MAX_CHANNELS; i++) {
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if (pchild->mon_type[i] == mon_type)
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break;
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}
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if (i >= PCF8584_MAX_CHANNELS)
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return 0;
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/* Read data from address and port. */
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data = envctrl_i2c_read_8591((unsigned char)pchild->addr,
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(unsigned char)pchild->chnl_array[i].chnl_no);
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/* Find decoding table. */
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tbl = pchild->tables + pchild->tblprop_array[i].offset;
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return envctrl_i2c_data_translate(data, pchild->tblprop_array[i].type,
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pchild->tblprop_array[i].scale,
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tbl, bufdata);
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}
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/* Function Description: Read fan status.
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* Return : Always 1 byte. Status stored in bufdata.
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*/
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static int envctrl_i2c_fan_status(struct i2c_child_t *pchild,
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unsigned char data,
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char *bufdata)
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{
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unsigned char tmp, ret = 0;
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int i, j = 0;
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tmp = data & pchild->fan_mask;
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if (tmp == pchild->fan_mask) {
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/* All bits are on. All fans are functioning. */
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ret = ENVCTRL_ALL_FANS_GOOD;
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} else if (tmp == 0) {
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/* No bits are on. No fans are functioning. */
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ret = ENVCTRL_ALL_FANS_BAD;
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} else {
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/* Go through all channels, mark 'on' the matched bits.
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* Notice that fan_mask may have discontiguous bits but
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* return mask are always contiguous. For example if we
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* monitor 4 fans at channels 0,1,2,4, the return mask
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* should be 00010000 if only fan at channel 4 is working.
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*/
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for (i = 0; i < PCF8584_MAX_CHANNELS;i++) {
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if (pchild->fan_mask & chnls_mask[i]) {
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if (!(chnls_mask[i] & tmp))
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ret |= chnls_mask[j];
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j++;
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}
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}
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}
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bufdata[0] = ret;
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return 1;
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}
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/* Function Description: Read global addressing line.
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* Return : Always 1 byte. Status stored in bufdata.
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*/
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static int envctrl_i2c_globaladdr(struct i2c_child_t *pchild,
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unsigned char data,
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char *bufdata)
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{
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/* Translatation table is not necessary, as global
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* addr is the integer value of the GA# bits.
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*
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* NOTE: MSB is documented as zero, but I see it as '1' always....
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*
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* -----------------------------------------------
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* | 0 | FAL | DEG | GA4 | GA3 | GA2 | GA1 | GA0 |
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* -----------------------------------------------
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* GA0 - GA4 integer value of Global Address (backplane slot#)
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* DEG 0 = cPCI Power supply output is starting to degrade
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* 1 = cPCI Power supply output is OK
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* FAL 0 = cPCI Power supply has failed
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* 1 = cPCI Power supply output is OK
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*/
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bufdata[0] = (data & ENVCTRL_GLOBALADDR_ADDR_MASK);
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return 1;
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}
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/* Function Description: Read standard voltage and power supply status.
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* Return : Always 1 byte. Status stored in bufdata.
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*/
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static unsigned char envctrl_i2c_voltage_status(struct i2c_child_t *pchild,
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unsigned char data,
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char *bufdata)
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{
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unsigned char tmp, ret = 0;
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int i, j = 0;
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tmp = data & pchild->voltage_mask;
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/* Two channels are used to monitor voltage and power supply. */
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if (tmp == pchild->voltage_mask) {
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/* All bits are on. Voltage and power supply are okay. */
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ret = ENVCTRL_VOLTAGE_POWERSUPPLY_GOOD;
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} else if (tmp == 0) {
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/* All bits are off. Voltage and power supply are bad */
|
|
ret = ENVCTRL_VOLTAGE_POWERSUPPLY_BAD;
|
|
} else {
|
|
/* Either voltage or power supply has problem. */
|
|
for (i = 0; i < PCF8584_MAX_CHANNELS; i++) {
|
|
if (pchild->voltage_mask & chnls_mask[i]) {
|
|
j++;
|
|
|
|
/* Break out when there is a mismatch. */
|
|
if (!(chnls_mask[i] & tmp))
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Make a wish that hardware will always use the
|
|
* first channel for voltage and the second for
|
|
* power supply.
|
|
*/
|
|
if (j == 1)
|
|
ret = ENVCTRL_VOLTAGE_BAD;
|
|
else
|
|
ret = ENVCTRL_POWERSUPPLY_BAD;
|
|
}
|
|
|
|
bufdata[0] = ret;
|
|
return 1;
|
|
}
|
|
|
|
/* Function Description: Read a byte from /dev/envctrl. Mapped to user read().
|
|
* Return: Number of read bytes. 0 for error.
|
|
*/
|
|
static ssize_t
|
|
envctrl_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
|
|
{
|
|
struct i2c_child_t *pchild;
|
|
unsigned char data[10];
|
|
int ret = 0;
|
|
|
|
/* Get the type of read as decided in ioctl() call.
|
|
* Find the appropriate i2c child.
|
|
* Get the data and put back to the user buffer.
|
|
*/
|
|
|
|
switch ((int)(long)file->private_data) {
|
|
case ENVCTRL_RD_WARNING_TEMPERATURE:
|
|
if (warning_temperature == 0)
|
|
return 0;
|
|
|
|
data[0] = (unsigned char)(warning_temperature);
|
|
ret = 1;
|
|
if (copy_to_user(buf, data, ret))
|
|
ret = -EFAULT;
|
|
break;
|
|
|
|
case ENVCTRL_RD_SHUTDOWN_TEMPERATURE:
|
|
if (shutdown_temperature == 0)
|
|
return 0;
|
|
|
|
data[0] = (unsigned char)(shutdown_temperature);
|
|
ret = 1;
|
|
if (copy_to_user(buf, data, ret))
|
|
ret = -EFAULT;
|
|
break;
|
|
|
|
case ENVCTRL_RD_MTHRBD_TEMPERATURE:
|
|
if (!(pchild = envctrl_get_i2c_child(ENVCTRL_MTHRBDTEMP_MON)))
|
|
return 0;
|
|
ret = envctrl_read_noncpu_info(pchild, ENVCTRL_MTHRBDTEMP_MON, data);
|
|
if (copy_to_user(buf, data, ret))
|
|
ret = -EFAULT;
|
|
break;
|
|
|
|
case ENVCTRL_RD_CPU_TEMPERATURE:
|
|
if (!(pchild = envctrl_get_i2c_child(ENVCTRL_CPUTEMP_MON)))
|
|
return 0;
|
|
ret = envctrl_read_cpu_info(read_cpu, pchild, ENVCTRL_CPUTEMP_MON, data);
|
|
|
|
/* Reset cpu to the default cpu0. */
|
|
if (copy_to_user(buf, data, ret))
|
|
ret = -EFAULT;
|
|
break;
|
|
|
|
case ENVCTRL_RD_CPU_VOLTAGE:
|
|
if (!(pchild = envctrl_get_i2c_child(ENVCTRL_CPUVOLTAGE_MON)))
|
|
return 0;
|
|
ret = envctrl_read_cpu_info(read_cpu, pchild, ENVCTRL_CPUVOLTAGE_MON, data);
|
|
|
|
/* Reset cpu to the default cpu0. */
|
|
if (copy_to_user(buf, data, ret))
|
|
ret = -EFAULT;
|
|
break;
|
|
|
|
case ENVCTRL_RD_SCSI_TEMPERATURE:
|
|
if (!(pchild = envctrl_get_i2c_child(ENVCTRL_SCSITEMP_MON)))
|
|
return 0;
|
|
ret = envctrl_read_noncpu_info(pchild, ENVCTRL_SCSITEMP_MON, data);
|
|
if (copy_to_user(buf, data, ret))
|
|
ret = -EFAULT;
|
|
break;
|
|
|
|
case ENVCTRL_RD_ETHERNET_TEMPERATURE:
|
|
if (!(pchild = envctrl_get_i2c_child(ENVCTRL_ETHERTEMP_MON)))
|
|
return 0;
|
|
ret = envctrl_read_noncpu_info(pchild, ENVCTRL_ETHERTEMP_MON, data);
|
|
if (copy_to_user(buf, data, ret))
|
|
ret = -EFAULT;
|
|
break;
|
|
|
|
case ENVCTRL_RD_FAN_STATUS:
|
|
if (!(pchild = envctrl_get_i2c_child(ENVCTRL_FANSTAT_MON)))
|
|
return 0;
|
|
data[0] = envctrl_i2c_read_8574(pchild->addr);
|
|
ret = envctrl_i2c_fan_status(pchild,data[0], data);
|
|
if (copy_to_user(buf, data, ret))
|
|
ret = -EFAULT;
|
|
break;
|
|
|
|
case ENVCTRL_RD_GLOBALADDRESS:
|
|
if (!(pchild = envctrl_get_i2c_child(ENVCTRL_GLOBALADDR_MON)))
|
|
return 0;
|
|
data[0] = envctrl_i2c_read_8574(pchild->addr);
|
|
ret = envctrl_i2c_globaladdr(pchild, data[0], data);
|
|
if (copy_to_user(buf, data, ret))
|
|
ret = -EFAULT;
|
|
break;
|
|
|
|
case ENVCTRL_RD_VOLTAGE_STATUS:
|
|
if (!(pchild = envctrl_get_i2c_child(ENVCTRL_VOLTAGESTAT_MON)))
|
|
/* If voltage monitor not present, check for CPCI equivalent */
|
|
if (!(pchild = envctrl_get_i2c_child(ENVCTRL_GLOBALADDR_MON)))
|
|
return 0;
|
|
data[0] = envctrl_i2c_read_8574(pchild->addr);
|
|
ret = envctrl_i2c_voltage_status(pchild, data[0], data);
|
|
if (copy_to_user(buf, data, ret))
|
|
ret = -EFAULT;
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* Function Description: Command what to read. Mapped to user ioctl().
|
|
* Return: Gives 0 for implemented commands, -EINVAL otherwise.
|
|
*/
|
|
static long
|
|
envctrl_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
|
|
{
|
|
char __user *infobuf;
|
|
|
|
switch (cmd) {
|
|
case ENVCTRL_RD_WARNING_TEMPERATURE:
|
|
case ENVCTRL_RD_SHUTDOWN_TEMPERATURE:
|
|
case ENVCTRL_RD_MTHRBD_TEMPERATURE:
|
|
case ENVCTRL_RD_FAN_STATUS:
|
|
case ENVCTRL_RD_VOLTAGE_STATUS:
|
|
case ENVCTRL_RD_ETHERNET_TEMPERATURE:
|
|
case ENVCTRL_RD_SCSI_TEMPERATURE:
|
|
case ENVCTRL_RD_GLOBALADDRESS:
|
|
file->private_data = (void *)(long)cmd;
|
|
break;
|
|
|
|
case ENVCTRL_RD_CPU_TEMPERATURE:
|
|
case ENVCTRL_RD_CPU_VOLTAGE:
|
|
/* Check to see if application passes in any cpu number,
|
|
* the default is cpu0.
|
|
*/
|
|
infobuf = (char __user *) arg;
|
|
if (infobuf == NULL) {
|
|
read_cpu = 0;
|
|
}else {
|
|
get_user(read_cpu, infobuf);
|
|
}
|
|
|
|
/* Save the command for use when reading. */
|
|
file->private_data = (void *)(long)cmd;
|
|
break;
|
|
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Function Description: open device. Mapped to user open().
|
|
* Return: Always 0.
|
|
*/
|
|
static int
|
|
envctrl_open(struct inode *inode, struct file *file)
|
|
{
|
|
file->private_data = NULL;
|
|
return 0;
|
|
}
|
|
|
|
/* Function Description: Open device. Mapped to user close().
|
|
* Return: Always 0.
|
|
*/
|
|
static int
|
|
envctrl_release(struct inode *inode, struct file *file)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static const struct file_operations envctrl_fops = {
|
|
.owner = THIS_MODULE,
|
|
.read = envctrl_read,
|
|
.unlocked_ioctl = envctrl_ioctl,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_ioctl = envctrl_ioctl,
|
|
#endif
|
|
.open = envctrl_open,
|
|
.release = envctrl_release,
|
|
.llseek = noop_llseek,
|
|
};
|
|
|
|
static struct miscdevice envctrl_dev = {
|
|
ENVCTRL_MINOR,
|
|
"envctrl",
|
|
&envctrl_fops
|
|
};
|
|
|
|
/* Function Description: Set monitor type based on firmware description.
|
|
* Return: None.
|
|
*/
|
|
static void envctrl_set_mon(struct i2c_child_t *pchild,
|
|
const char *chnl_desc,
|
|
int chnl_no)
|
|
{
|
|
/* Firmware only has temperature type. It does not distinguish
|
|
* different kinds of temperatures. We use channel description
|
|
* to disinguish them.
|
|
*/
|
|
if (!(strcmp(chnl_desc,"temp,cpu")) ||
|
|
!(strcmp(chnl_desc,"temp,cpu0")) ||
|
|
!(strcmp(chnl_desc,"temp,cpu1")) ||
|
|
!(strcmp(chnl_desc,"temp,cpu2")) ||
|
|
!(strcmp(chnl_desc,"temp,cpu3")))
|
|
pchild->mon_type[chnl_no] = ENVCTRL_CPUTEMP_MON;
|
|
|
|
if (!(strcmp(chnl_desc,"vddcore,cpu0")) ||
|
|
!(strcmp(chnl_desc,"vddcore,cpu1")) ||
|
|
!(strcmp(chnl_desc,"vddcore,cpu2")) ||
|
|
!(strcmp(chnl_desc,"vddcore,cpu3")))
|
|
pchild->mon_type[chnl_no] = ENVCTRL_CPUVOLTAGE_MON;
|
|
|
|
if (!(strcmp(chnl_desc,"temp,motherboard")))
|
|
pchild->mon_type[chnl_no] = ENVCTRL_MTHRBDTEMP_MON;
|
|
|
|
if (!(strcmp(chnl_desc,"temp,scsi")))
|
|
pchild->mon_type[chnl_no] = ENVCTRL_SCSITEMP_MON;
|
|
|
|
if (!(strcmp(chnl_desc,"temp,ethernet")))
|
|
pchild->mon_type[chnl_no] = ENVCTRL_ETHERTEMP_MON;
|
|
}
|
|
|
|
/* Function Description: Initialize monitor channel with channel desc,
|
|
* decoding tables, monitor type, optional properties.
|
|
* Return: None.
|
|
*/
|
|
static void envctrl_init_adc(struct i2c_child_t *pchild, struct device_node *dp)
|
|
{
|
|
int i = 0, len;
|
|
const char *pos;
|
|
const unsigned int *pval;
|
|
|
|
/* Firmware describe channels into a stream separated by a '\0'. */
|
|
pos = of_get_property(dp, "channels-description", &len);
|
|
|
|
while (len > 0) {
|
|
int l = strlen(pos) + 1;
|
|
envctrl_set_mon(pchild, pos, i++);
|
|
len -= l;
|
|
pos += l;
|
|
}
|
|
|
|
/* Get optional properties. */
|
|
pval = of_get_property(dp, "warning-temp", NULL);
|
|
if (pval)
|
|
warning_temperature = *pval;
|
|
|
|
pval = of_get_property(dp, "shutdown-temp", NULL);
|
|
if (pval)
|
|
shutdown_temperature = *pval;
|
|
}
|
|
|
|
/* Function Description: Initialize child device monitoring fan status.
|
|
* Return: None.
|
|
*/
|
|
static void envctrl_init_fanstat(struct i2c_child_t *pchild)
|
|
{
|
|
int i;
|
|
|
|
/* Go through all channels and set up the mask. */
|
|
for (i = 0; i < pchild->total_chnls; i++)
|
|
pchild->fan_mask |= chnls_mask[(pchild->chnl_array[i]).chnl_no];
|
|
|
|
/* We only need to know if this child has fan status monitored.
|
|
* We don't care which channels since we have the mask already.
|
|
*/
|
|
pchild->mon_type[0] = ENVCTRL_FANSTAT_MON;
|
|
}
|
|
|
|
/* Function Description: Initialize child device for global addressing line.
|
|
* Return: None.
|
|
*/
|
|
static void envctrl_init_globaladdr(struct i2c_child_t *pchild)
|
|
{
|
|
int i;
|
|
|
|
/* Voltage/PowerSupply monitoring is piggybacked
|
|
* with Global Address on CompactPCI. See comments
|
|
* within envctrl_i2c_globaladdr for bit assignments.
|
|
*
|
|
* The mask is created here by assigning mask bits to each
|
|
* bit position that represents PCF8584_VOLTAGE_TYPE data.
|
|
* Channel numbers are not consecutive within the globaladdr
|
|
* node (why?), so we use the actual counter value as chnls_mask
|
|
* index instead of the chnl_array[x].chnl_no value.
|
|
*
|
|
* NOTE: This loop could be replaced with a constant representing
|
|
* a mask of bits 5&6 (ENVCTRL_GLOBALADDR_PSTAT_MASK).
|
|
*/
|
|
for (i = 0; i < pchild->total_chnls; i++) {
|
|
if (PCF8584_VOLTAGE_TYPE == pchild->chnl_array[i].type) {
|
|
pchild->voltage_mask |= chnls_mask[i];
|
|
}
|
|
}
|
|
|
|
/* We only need to know if this child has global addressing
|
|
* line monitored. We don't care which channels since we know
|
|
* the mask already (ENVCTRL_GLOBALADDR_ADDR_MASK).
|
|
*/
|
|
pchild->mon_type[0] = ENVCTRL_GLOBALADDR_MON;
|
|
}
|
|
|
|
/* Initialize child device monitoring voltage status. */
|
|
static void envctrl_init_voltage_status(struct i2c_child_t *pchild)
|
|
{
|
|
int i;
|
|
|
|
/* Go through all channels and set up the mask. */
|
|
for (i = 0; i < pchild->total_chnls; i++)
|
|
pchild->voltage_mask |= chnls_mask[(pchild->chnl_array[i]).chnl_no];
|
|
|
|
/* We only need to know if this child has voltage status monitored.
|
|
* We don't care which channels since we have the mask already.
|
|
*/
|
|
pchild->mon_type[0] = ENVCTRL_VOLTAGESTAT_MON;
|
|
}
|
|
|
|
/* Function Description: Initialize i2c child device.
|
|
* Return: None.
|
|
*/
|
|
static void envctrl_init_i2c_child(struct device_node *dp,
|
|
struct i2c_child_t *pchild)
|
|
{
|
|
int len, i, tbls_size = 0;
|
|
const void *pval;
|
|
|
|
/* Get device address. */
|
|
pval = of_get_property(dp, "reg", &len);
|
|
memcpy(&pchild->addr, pval, len);
|
|
|
|
/* Get tables property. Read firmware temperature tables. */
|
|
pval = of_get_property(dp, "translation", &len);
|
|
if (pval && len > 0) {
|
|
memcpy(pchild->tblprop_array, pval, len);
|
|
pchild->total_tbls = len / sizeof(struct pcf8584_tblprop);
|
|
for (i = 0; i < pchild->total_tbls; i++) {
|
|
if ((pchild->tblprop_array[i].size + pchild->tblprop_array[i].offset) > tbls_size) {
|
|
tbls_size = pchild->tblprop_array[i].size + pchild->tblprop_array[i].offset;
|
|
}
|
|
}
|
|
|
|
pchild->tables = kmalloc(tbls_size, GFP_KERNEL);
|
|
if (pchild->tables == NULL){
|
|
printk(KERN_ERR PFX "Failed to allocate table.\n");
|
|
return;
|
|
}
|
|
pval = of_get_property(dp, "tables", &len);
|
|
if (!pval || len <= 0) {
|
|
printk(KERN_ERR PFX "Failed to get table.\n");
|
|
return;
|
|
}
|
|
memcpy(pchild->tables, pval, len);
|
|
}
|
|
|
|
/* SPARCengine ASM Reference Manual (ref. SMI doc 805-7581-04)
|
|
* sections 2.5, 3.5, 4.5 state node 0x70 for CP1400/1500 is
|
|
* "For Factory Use Only."
|
|
*
|
|
* We ignore the node on these platforms by assigning the
|
|
* 'NULL' monitor type.
|
|
*/
|
|
if (ENVCTRL_CPCI_IGNORED_NODE == pchild->addr) {
|
|
struct device_node *root_node;
|
|
int len;
|
|
|
|
root_node = of_find_node_by_path("/");
|
|
if (!strcmp(root_node->name, "SUNW,UltraSPARC-IIi-cEngine")) {
|
|
for (len = 0; len < PCF8584_MAX_CHANNELS; ++len) {
|
|
pchild->mon_type[len] = ENVCTRL_NOMON;
|
|
}
|
|
of_node_put(root_node);
|
|
return;
|
|
}
|
|
of_node_put(root_node);
|
|
}
|
|
|
|
/* Get the monitor channels. */
|
|
pval = of_get_property(dp, "channels-in-use", &len);
|
|
memcpy(pchild->chnl_array, pval, len);
|
|
pchild->total_chnls = len / sizeof(struct pcf8584_channel);
|
|
|
|
for (i = 0; i < pchild->total_chnls; i++) {
|
|
switch (pchild->chnl_array[i].type) {
|
|
case PCF8584_TEMP_TYPE:
|
|
envctrl_init_adc(pchild, dp);
|
|
break;
|
|
|
|
case PCF8584_GLOBALADDR_TYPE:
|
|
envctrl_init_globaladdr(pchild);
|
|
i = pchild->total_chnls;
|
|
break;
|
|
|
|
case PCF8584_FANSTAT_TYPE:
|
|
envctrl_init_fanstat(pchild);
|
|
i = pchild->total_chnls;
|
|
break;
|
|
|
|
case PCF8584_VOLTAGE_TYPE:
|
|
if (pchild->i2ctype == I2C_ADC) {
|
|
envctrl_init_adc(pchild,dp);
|
|
} else {
|
|
envctrl_init_voltage_status(pchild);
|
|
}
|
|
i = pchild->total_chnls;
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Function Description: Search the child device list for a device.
|
|
* Return : The i2c child if found. NULL otherwise.
|
|
*/
|
|
static struct i2c_child_t *envctrl_get_i2c_child(unsigned char mon_type)
|
|
{
|
|
int i, j;
|
|
|
|
for (i = 0; i < ENVCTRL_MAX_CPU*2; i++) {
|
|
for (j = 0; j < PCF8584_MAX_CHANNELS; j++) {
|
|
if (i2c_childlist[i].mon_type[j] == mon_type) {
|
|
return (struct i2c_child_t *)(&(i2c_childlist[i]));
|
|
}
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static void envctrl_do_shutdown(void)
|
|
{
|
|
static int inprog = 0;
|
|
|
|
if (inprog != 0)
|
|
return;
|
|
|
|
inprog = 1;
|
|
printk(KERN_CRIT "kenvctrld: WARNING: Shutting down the system now.\n");
|
|
orderly_poweroff(true);
|
|
}
|
|
|
|
static struct task_struct *kenvctrld_task;
|
|
|
|
static int kenvctrld(void *__unused)
|
|
{
|
|
int poll_interval;
|
|
int whichcpu;
|
|
char tempbuf[10];
|
|
struct i2c_child_t *cputemp;
|
|
|
|
if (NULL == (cputemp = envctrl_get_i2c_child(ENVCTRL_CPUTEMP_MON))) {
|
|
printk(KERN_ERR PFX
|
|
"kenvctrld unable to monitor CPU temp-- exiting\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
poll_interval = 5000; /* TODO env_mon_interval */
|
|
|
|
printk(KERN_INFO PFX "%s starting...\n", current->comm);
|
|
for (;;) {
|
|
msleep_interruptible(poll_interval);
|
|
|
|
if (kthread_should_stop())
|
|
break;
|
|
|
|
for (whichcpu = 0; whichcpu < ENVCTRL_MAX_CPU; ++whichcpu) {
|
|
if (0 < envctrl_read_cpu_info(whichcpu, cputemp,
|
|
ENVCTRL_CPUTEMP_MON,
|
|
tempbuf)) {
|
|
if (tempbuf[0] >= shutdown_temperature) {
|
|
printk(KERN_CRIT
|
|
"%s: WARNING: CPU%i temperature %i C meets or exceeds "\
|
|
"shutdown threshold %i C\n",
|
|
current->comm, whichcpu,
|
|
tempbuf[0], shutdown_temperature);
|
|
envctrl_do_shutdown();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
printk(KERN_INFO PFX "%s exiting...\n", current->comm);
|
|
return 0;
|
|
}
|
|
|
|
static int envctrl_probe(struct platform_device *op)
|
|
{
|
|
struct device_node *dp;
|
|
int index, err;
|
|
|
|
if (i2c)
|
|
return -EINVAL;
|
|
|
|
i2c = of_ioremap(&op->resource[0], 0, 0x2, DRIVER_NAME);
|
|
if (!i2c)
|
|
return -ENOMEM;
|
|
|
|
index = 0;
|
|
dp = op->dev.of_node->child;
|
|
while (dp) {
|
|
if (!strcmp(dp->name, "gpio")) {
|
|
i2c_childlist[index].i2ctype = I2C_GPIO;
|
|
envctrl_init_i2c_child(dp, &(i2c_childlist[index++]));
|
|
} else if (!strcmp(dp->name, "adc")) {
|
|
i2c_childlist[index].i2ctype = I2C_ADC;
|
|
envctrl_init_i2c_child(dp, &(i2c_childlist[index++]));
|
|
}
|
|
|
|
dp = dp->sibling;
|
|
}
|
|
|
|
/* Set device address. */
|
|
writeb(CONTROL_PIN, i2c + PCF8584_CSR);
|
|
writeb(PCF8584_ADDRESS, i2c + PCF8584_DATA);
|
|
|
|
/* Set system clock and SCL frequencies. */
|
|
writeb(CONTROL_PIN | CONTROL_ES1, i2c + PCF8584_CSR);
|
|
writeb(CLK_4_43 | BUS_CLK_90, i2c + PCF8584_DATA);
|
|
|
|
/* Enable serial interface. */
|
|
writeb(CONTROL_PIN | CONTROL_ES0 | CONTROL_ACK, i2c + PCF8584_CSR);
|
|
udelay(200);
|
|
|
|
/* Register the device as a minor miscellaneous device. */
|
|
err = misc_register(&envctrl_dev);
|
|
if (err) {
|
|
printk(KERN_ERR PFX "Unable to get misc minor %d\n",
|
|
envctrl_dev.minor);
|
|
goto out_iounmap;
|
|
}
|
|
|
|
/* Note above traversal routine post-incremented 'i' to accommodate
|
|
* a next child device, so we decrement before reverse-traversal of
|
|
* child devices.
|
|
*/
|
|
printk(KERN_INFO PFX "Initialized ");
|
|
for (--index; index >= 0; --index) {
|
|
printk("[%s 0x%lx]%s",
|
|
(I2C_ADC == i2c_childlist[index].i2ctype) ? "adc" :
|
|
((I2C_GPIO == i2c_childlist[index].i2ctype) ? "gpio" : "unknown"),
|
|
i2c_childlist[index].addr, (0 == index) ? "\n" : " ");
|
|
}
|
|
|
|
kenvctrld_task = kthread_run(kenvctrld, NULL, "kenvctrld");
|
|
if (IS_ERR(kenvctrld_task)) {
|
|
err = PTR_ERR(kenvctrld_task);
|
|
goto out_deregister;
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_deregister:
|
|
misc_deregister(&envctrl_dev);
|
|
out_iounmap:
|
|
of_iounmap(&op->resource[0], i2c, 0x2);
|
|
for (index = 0; index < ENVCTRL_MAX_CPU * 2; index++)
|
|
kfree(i2c_childlist[index].tables);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int envctrl_remove(struct platform_device *op)
|
|
{
|
|
int index;
|
|
|
|
kthread_stop(kenvctrld_task);
|
|
|
|
of_iounmap(&op->resource[0], i2c, 0x2);
|
|
misc_deregister(&envctrl_dev);
|
|
|
|
for (index = 0; index < ENVCTRL_MAX_CPU * 2; index++)
|
|
kfree(i2c_childlist[index].tables);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id envctrl_match[] = {
|
|
{
|
|
.name = "i2c",
|
|
.compatible = "i2cpcf,8584",
|
|
},
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, envctrl_match);
|
|
|
|
static struct platform_driver envctrl_driver = {
|
|
.driver = {
|
|
.name = DRIVER_NAME,
|
|
.of_match_table = envctrl_match,
|
|
},
|
|
.probe = envctrl_probe,
|
|
.remove = envctrl_remove,
|
|
};
|
|
|
|
module_platform_driver(envctrl_driver);
|
|
|
|
MODULE_LICENSE("GPL");
|