diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-17 02:20:36 +0400 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-17 02:20:36 +0400 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/sbus/char/envctrl.c | |
download | linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'drivers/sbus/char/envctrl.c')
-rw-r--r-- | drivers/sbus/char/envctrl.c | 1181 |
1 files changed, 1181 insertions, 0 deletions
diff --git a/drivers/sbus/char/envctrl.c b/drivers/sbus/char/envctrl.c new file mode 100644 index 000000000000..f6ed35b24f43 --- /dev/null +++ b/drivers/sbus/char/envctrl.c @@ -0,0 +1,1181 @@ +/* $Id: envctrl.c,v 1.25 2002/01/15 09:01:26 davem Exp $ + * envctrl.c: Temperature and Fan monitoring on Machines providing it. + * + * Copyright (C) 1998 Eddie C. Dost (ecd@skynet.be) + * Copyright (C) 2000 Vinh Truong (vinh.truong@eng.sun.com) + * VT - The implementation is to support Sun Microelectronics (SME) platform + * environment monitoring. SME platforms use pcf8584 as the i2c bus + * controller to access pcf8591 (8-bit A/D and D/A converter) and + * pcf8571 (256 x 8-bit static low-voltage RAM with I2C-bus interface). + * At board level, it follows SME Firmware I2C Specification. Reference: + * http://www-eu2.semiconductors.com/pip/PCF8584P + * http://www-eu2.semiconductors.com/pip/PCF8574AP + * http://www-eu2.semiconductors.com/pip/PCF8591P + * + * EB - Added support for CP1500 Global Address and PS/Voltage monitoring. + * Eric Brower <ebrower@usa.net> + * + * DB - Audit every copy_to_user in envctrl_read. + * Daniele Bellucci <bellucda@tiscali.it> + */ + +#include <linux/config.h> +#include <linux/module.h> +#include <linux/sched.h> +#include <linux/errno.h> +#include <linux/delay.h> +#include <linux/ioport.h> +#include <linux/init.h> +#include <linux/miscdevice.h> +#include <linux/mm.h> +#include <linux/slab.h> +#include <linux/kernel.h> + +#include <asm/ebus.h> +#include <asm/uaccess.h> +#include <asm/envctrl.h> + +#define __KERNEL_SYSCALLS__ +static int errno; +#include <asm/unistd.h> + +#define ENVCTRL_MINOR 162 + +#define PCF8584_ADDRESS 0x55 + +#define CONTROL_PIN 0x80 +#define CONTROL_ES0 0x40 +#define CONTROL_ES1 0x20 +#define CONTROL_ES2 0x10 +#define CONTROL_ENI 0x08 +#define CONTROL_STA 0x04 +#define CONTROL_STO 0x02 +#define CONTROL_ACK 0x01 + +#define STATUS_PIN 0x80 +#define STATUS_STS 0x20 +#define STATUS_BER 0x10 +#define STATUS_LRB 0x08 +#define STATUS_AD0 0x08 +#define STATUS_AAB 0x04 +#define STATUS_LAB 0x02 +#define STATUS_BB 0x01 + +/* + * CLK Mode Register. + */ +#define BUS_CLK_90 0x00 +#define BUS_CLK_45 0x01 +#define BUS_CLK_11 0x02 +#define BUS_CLK_1_5 0x03 + +#define CLK_3 0x00 +#define CLK_4_43 0x10 +#define CLK_6 0x14 +#define CLK_8 0x18 +#define CLK_12 0x1c + +#define OBD_SEND_START 0xc5 /* value to generate I2c_bus START condition */ +#define OBD_SEND_STOP 0xc3 /* value to generate I2c_bus STOP condition */ + +/* Monitor type of i2c child device. + * Firmware definitions. + */ +#define PCF8584_MAX_CHANNELS 8 +#define PCF8584_GLOBALADDR_TYPE 6 /* global address monitor */ +#define PCF8584_FANSTAT_TYPE 3 /* fan status monitor */ +#define PCF8584_VOLTAGE_TYPE 2 /* voltage monitor */ +#define PCF8584_TEMP_TYPE 1 /* temperature monitor*/ + +/* Monitor type of i2c child device. + * Driver definitions. + */ +#define ENVCTRL_NOMON 0 +#define ENVCTRL_CPUTEMP_MON 1 /* cpu temperature monitor */ +#define ENVCTRL_CPUVOLTAGE_MON 2 /* voltage monitor */ +#define ENVCTRL_FANSTAT_MON 3 /* fan status monitor */ +#define ENVCTRL_ETHERTEMP_MON 4 /* ethernet temperarture */ + /* monitor */ +#define ENVCTRL_VOLTAGESTAT_MON 5 /* voltage status monitor */ +#define ENVCTRL_MTHRBDTEMP_MON 6 /* motherboard temperature */ +#define ENVCTRL_SCSITEMP_MON 7 /* scsi temperarture */ +#define ENVCTRL_GLOBALADDR_MON 8 /* global address */ + +/* Child device type. + * Driver definitions. + */ +#define I2C_ADC 0 /* pcf8591 */ +#define I2C_GPIO 1 /* pcf8571 */ + +/* Data read from child device may need to decode + * through a data table and a scale. + * Translation type as defined by firmware. + */ +#define ENVCTRL_TRANSLATE_NO 0 +#define ENVCTRL_TRANSLATE_PARTIAL 1 +#define ENVCTRL_TRANSLATE_COMBINED 2 +#define ENVCTRL_TRANSLATE_FULL 3 /* table[data] */ +#define ENVCTRL_TRANSLATE_SCALE 4 /* table[data]/scale */ + +/* Driver miscellaneous definitions. */ +#define ENVCTRL_MAX_CPU 4 +#define CHANNEL_DESC_SZ 256 + +/* Mask values for combined GlobalAddress/PowerStatus node */ +#define ENVCTRL_GLOBALADDR_ADDR_MASK 0x1F +#define ENVCTRL_GLOBALADDR_PSTAT_MASK 0x60 + +/* Node 0x70 ignored on CompactPCI CP1400/1500 platforms + * (see envctrl_init_i2c_child) + */ +#define ENVCTRL_CPCI_IGNORED_NODE 0x70 + +#define PCF8584_DATA 0x00 +#define PCF8584_CSR 0x01 + +/* Each child device can be monitored by up to PCF8584_MAX_CHANNELS. + * Property of a port or channel as defined by the firmware. + */ +struct pcf8584_channel { + unsigned char chnl_no; + unsigned char io_direction; + unsigned char type; + unsigned char last; +}; + +/* Each child device may have one or more tables of bytes to help decode + * data. Table property as defined by the firmware. + */ +struct pcf8584_tblprop { + unsigned int type; + unsigned int scale; + unsigned int offset; /* offset from the beginning of the table */ + unsigned int size; +}; + +/* i2c child */ +struct i2c_child_t { + /* Either ADC or GPIO. */ + unsigned char i2ctype; + unsigned long addr; + struct pcf8584_channel chnl_array[PCF8584_MAX_CHANNELS]; + + /* Channel info. */ + unsigned int total_chnls; /* Number of monitor channels. */ + unsigned char fan_mask; /* Byte mask for fan status channels. */ + unsigned char voltage_mask; /* Byte mask for voltage status channels. */ + struct pcf8584_tblprop tblprop_array[PCF8584_MAX_CHANNELS]; + + /* Properties of all monitor channels. */ + unsigned int total_tbls; /* Number of monitor tables. */ + char *tables; /* Pointer to table(s). */ + char chnls_desc[CHANNEL_DESC_SZ]; /* Channel description. */ + char mon_type[PCF8584_MAX_CHANNELS]; +}; + +static void __iomem *i2c; +static struct i2c_child_t i2c_childlist[ENVCTRL_MAX_CPU*2]; +static unsigned char chnls_mask[] = { 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80 }; +static unsigned int warning_temperature = 0; +static unsigned int shutdown_temperature = 0; +static char read_cpu; + +/* Forward declarations. */ +static struct i2c_child_t *envctrl_get_i2c_child(unsigned char); + +/* Function Description: Test the PIN bit (Pending Interrupt Not) + * to test when serial transmission is completed . + * Return : None. + */ +static void envtrl_i2c_test_pin(void) +{ + int limit = 1000000; + + while (--limit > 0) { + if (!(readb(i2c + PCF8584_CSR) & STATUS_PIN)) + break; + udelay(1); + } + + if (limit <= 0) + printk(KERN_INFO "envctrl: Pin status will not clear.\n"); +} + +/* Function Description: Test busy bit. + * Return : None. + */ +static void envctrl_i2c_test_bb(void) +{ + int limit = 1000000; + + while (--limit > 0) { + /* Busy bit 0 means busy. */ + if (readb(i2c + PCF8584_CSR) & STATUS_BB) + break; + udelay(1); + } + + if (limit <= 0) + printk(KERN_INFO "envctrl: Busy bit will not clear.\n"); +} + +/* Function Description: Send the address for a read access. + * Return : 0 if not acknowledged, otherwise acknowledged. + */ +static int envctrl_i2c_read_addr(unsigned char addr) +{ + envctrl_i2c_test_bb(); + + /* Load address. */ + writeb(addr + 1, i2c + PCF8584_DATA); + + envctrl_i2c_test_bb(); + + writeb(OBD_SEND_START, i2c + PCF8584_CSR); + + /* Wait for PIN. */ + envtrl_i2c_test_pin(); + + /* CSR 0 means acknowledged. */ + if (!(readb(i2c + PCF8584_CSR) & STATUS_LRB)) { + return readb(i2c + PCF8584_DATA); + } else { + writeb(OBD_SEND_STOP, i2c + PCF8584_CSR); + return 0; + } +} + +/* Function Description: Send the address for write mode. + * Return : None. + */ +static void envctrl_i2c_write_addr(unsigned char addr) +{ + envctrl_i2c_test_bb(); + writeb(addr, i2c + PCF8584_DATA); + + /* Generate Start condition. */ + writeb(OBD_SEND_START, i2c + PCF8584_CSR); +} + +/* Function Description: Read 1 byte of data from addr + * set by envctrl_i2c_read_addr() + * Return : Data from address set by envctrl_i2c_read_addr(). + */ +static unsigned char envctrl_i2c_read_data(void) +{ + envtrl_i2c_test_pin(); + writeb(CONTROL_ES0, i2c + PCF8584_CSR); /* Send neg ack. */ + return readb(i2c + PCF8584_DATA); +} + +/* Function Description: Instruct the device which port to read data from. + * Return : None. + */ +static void envctrl_i2c_write_data(unsigned char port) +{ + envtrl_i2c_test_pin(); + writeb(port, i2c + PCF8584_DATA); +} + +/* Function Description: Generate Stop condition after last byte is sent. + * Return : None. + */ +static void envctrl_i2c_stop(void) +{ + envtrl_i2c_test_pin(); + writeb(OBD_SEND_STOP, i2c + PCF8584_CSR); +} + +/* Function Description: Read adc device. + * Return : Data at address and port. + */ +static unsigned char envctrl_i2c_read_8591(unsigned char addr, unsigned char port) +{ + /* Send address. */ + envctrl_i2c_write_addr(addr); + + /* Setup port to read. */ + envctrl_i2c_write_data(port); + envctrl_i2c_stop(); + + /* Read port. */ + envctrl_i2c_read_addr(addr); + + /* Do a single byte read and send stop. */ + envctrl_i2c_read_data(); + envctrl_i2c_stop(); + + return readb(i2c + PCF8584_DATA); +} + +/* Function Description: Read gpio device. + * Return : Data at address. + */ +static unsigned char envctrl_i2c_read_8574(unsigned char addr) +{ + unsigned char rd; + + envctrl_i2c_read_addr(addr); + + /* Do a single byte read and send stop. */ + rd = envctrl_i2c_read_data(); + envctrl_i2c_stop(); + return rd; +} + +/* Function Description: Decode data read from an adc device using firmware + * table. + * Return: Number of read bytes. Data is stored in bufdata in ascii format. + */ +static int envctrl_i2c_data_translate(unsigned char data, int translate_type, + int scale, char *tbl, char *bufdata) +{ + int len = 0; + + switch (translate_type) { + case ENVCTRL_TRANSLATE_NO: + /* No decode necessary. */ + len = 1; + bufdata[0] = data; + break; + + case ENVCTRL_TRANSLATE_FULL: + /* Decode this way: data = table[data]. */ + len = 1; + bufdata[0] = tbl[data]; + break; + + case ENVCTRL_TRANSLATE_SCALE: + /* Decode this way: data = table[data]/scale */ + sprintf(bufdata,"%d ", (tbl[data] * 10) / (scale)); + len = strlen(bufdata); + bufdata[len - 1] = bufdata[len - 2]; + bufdata[len - 2] = '.'; + break; + + default: + break; + }; + + return len; +} + +/* Function Description: Read cpu-related data such as cpu temperature, voltage. + * Return: Number of read bytes. Data is stored in bufdata in ascii format. + */ +static int envctrl_read_cpu_info(int cpu, struct i2c_child_t *pchild, + char mon_type, unsigned char *bufdata) +{ + unsigned char data; + int i; + char *tbl, j = -1; + + /* Find the right monitor type and channel. */ + for (i = 0; i < PCF8584_MAX_CHANNELS; i++) { + if (pchild->mon_type[i] == mon_type) { + if (++j == cpu) { + break; + } + } + } + + if (j != cpu) + return 0; + + /* Read data from address and port. */ + data = envctrl_i2c_read_8591((unsigned char)pchild->addr, + (unsigned char)pchild->chnl_array[i].chnl_no); + + /* Find decoding table. */ + tbl = pchild->tables + pchild->tblprop_array[i].offset; + + return envctrl_i2c_data_translate(data, pchild->tblprop_array[i].type, + pchild->tblprop_array[i].scale, + tbl, bufdata); +} + +/* Function Description: Read noncpu-related data such as motherboard + * temperature. + * Return: Number of read bytes. Data is stored in bufdata in ascii format. + */ +static int envctrl_read_noncpu_info(struct i2c_child_t *pchild, + char mon_type, unsigned char *bufdata) +{ + unsigned char data; + int i; + char *tbl = NULL; + + for (i = 0; i < PCF8584_MAX_CHANNELS; i++) { + if (pchild->mon_type[i] == mon_type) + break; + } + + if (i >= PCF8584_MAX_CHANNELS) + return 0; + + /* Read data from address and port. */ + data = envctrl_i2c_read_8591((unsigned char)pchild->addr, + (unsigned char)pchild->chnl_array[i].chnl_no); + + /* Find decoding table. */ + tbl = pchild->tables + pchild->tblprop_array[i].offset; + + return envctrl_i2c_data_translate(data, pchild->tblprop_array[i].type, + pchild->tblprop_array[i].scale, + tbl, bufdata); +} + +/* Function Description: Read fan status. + * Return : Always 1 byte. Status stored in bufdata. + */ +static int envctrl_i2c_fan_status(struct i2c_child_t *pchild, + unsigned char data, + char *bufdata) +{ + unsigned char tmp, ret = 0; + int i, j = 0; + + tmp = data & pchild->fan_mask; + + if (tmp == pchild->fan_mask) { + /* All bits are on. All fans are functioning. */ + ret = ENVCTRL_ALL_FANS_GOOD; + } else if (tmp == 0) { + /* No bits are on. No fans are functioning. */ + ret = ENVCTRL_ALL_FANS_BAD; + } else { + /* Go through all channels, mark 'on' the matched bits. + * Notice that fan_mask may have discontiguous bits but + * return mask are always contiguous. For example if we + * monitor 4 fans at channels 0,1,2,4, the return mask + * should be 00010000 if only fan at channel 4 is working. + */ + for (i = 0; i < PCF8584_MAX_CHANNELS;i++) { + if (pchild->fan_mask & chnls_mask[i]) { + if (!(chnls_mask[i] & tmp)) + ret |= chnls_mask[j]; + + j++; + } + } + } + + bufdata[0] = ret; + return 1; +} + +/* Function Description: Read global addressing line. + * Return : Always 1 byte. Status stored in bufdata. + */ +static int envctrl_i2c_globaladdr(struct i2c_child_t *pchild, + unsigned char data, + char *bufdata) +{ + /* Translatation table is not necessary, as global + * addr is the integer value of the GA# bits. + * + * NOTE: MSB is documented as zero, but I see it as '1' always.... + * + * ----------------------------------------------- + * | 0 | FAL | DEG | GA4 | GA3 | GA2 | GA1 | GA0 | + * ----------------------------------------------- + * GA0 - GA4 integer value of Global Address (backplane slot#) + * DEG 0 = cPCI Power supply output is starting to degrade + * 1 = cPCI Power supply output is OK + * FAL 0 = cPCI Power supply has failed + * 1 = cPCI Power supply output is OK + */ + bufdata[0] = (data & ENVCTRL_GLOBALADDR_ADDR_MASK); + return 1; +} + +/* Function Description: Read standard voltage and power supply status. + * Return : Always 1 byte. Status stored in bufdata. + */ +static unsigned char envctrl_i2c_voltage_status(struct i2c_child_t *pchild, + unsigned char data, + char *bufdata) +{ + unsigned char tmp, ret = 0; + int i, j = 0; + + tmp = data & pchild->voltage_mask; + + /* Two channels are used to monitor voltage and power supply. */ + if (tmp == pchild->voltage_mask) { + /* All bits are on. Voltage and power supply are okay. */ + ret = ENVCTRL_VOLTAGE_POWERSUPPLY_GOOD; + } else if (tmp == 0) { + /* 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 int +envctrl_ioctl(struct inode *inode, 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 struct file_operations envctrl_fops = { + .owner = THIS_MODULE, + .read = envctrl_read, + .ioctl = envctrl_ioctl, + .open = envctrl_open, + .release = envctrl_release, +}; + +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, + 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, int node) +{ + char chnls_desc[CHANNEL_DESC_SZ]; + int i = 0, len; + char *pos = chnls_desc; + + /* Firmware describe channels into a stream separated by a '\0'. */ + len = prom_getproperty(node, "channels-description", chnls_desc, + CHANNEL_DESC_SZ); + chnls_desc[CHANNEL_DESC_SZ - 1] = '\0'; + + while (len > 0) { + int l = strlen(pos) + 1; + envctrl_set_mon(pchild, pos, i++); + len -= l; + pos += l; + } + + /* Get optional properties. */ + len = prom_getproperty(node, "warning-temp", (char *)&warning_temperature, + sizeof(warning_temperature)); + len = prom_getproperty(node, "shutdown-temp", (char *)&shutdown_temperature, + sizeof(shutdown_temperature)); +} + +/* 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 linux_ebus_child *edev_child, + struct i2c_child_t *pchild) +{ + int node, len, i, tbls_size = 0; + + node = edev_child->prom_node; + + /* Get device address. */ + len = prom_getproperty(node, "reg", + (char *) &(pchild->addr), + sizeof(pchild->addr)); + + /* Get tables property. Read firmware temperature tables. */ + len = prom_getproperty(node, "translation", + (char *) pchild->tblprop_array, + (PCF8584_MAX_CHANNELS * + sizeof(struct pcf8584_tblprop))); + if (len > 0) { + 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("envctrl: Failed to allocate table.\n"); + return; + } + len = prom_getproperty(node, "tables", + (char *) pchild->tables, tbls_size); + if (len <= 0) { + printk("envctrl: Failed to get table.\n"); + return; + } + } + + /* 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) { + int len; + char prop[56]; + + len = prom_getproperty(prom_root_node, "name", prop, sizeof(prop)); + if (0 < len && (0 == strncmp(prop, "SUNW,UltraSPARC-IIi-cEngine", len))) + { + for (len = 0; len < PCF8584_MAX_CHANNELS; ++len) { + pchild->mon_type[len] = ENVCTRL_NOMON; + } + return; + } + } + + /* Get the monitor channels. */ + len = prom_getproperty(node, "channels-in-use", + (char *) pchild->chnl_array, + (PCF8584_MAX_CHANNELS * + sizeof(struct pcf8584_channel))); + 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, node); + 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,node); + } 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; + static char *envp[] = { + "HOME=/", "TERM=linux", "PATH=/sbin:/usr/sbin:/bin:/usr/bin", NULL }; + char *argv[] = { + "/sbin/shutdown", "-h", "now", NULL }; + + if (inprog != 0) + return; + + inprog = 1; + printk(KERN_CRIT "kenvctrld: WARNING: Shutting down the system now.\n"); + if (0 > execve("/sbin/shutdown", argv, envp)) { + printk(KERN_CRIT "kenvctrld: WARNING: system shutdown failed!\n"); + inprog = 0; /* unlikely to succeed, but we could try again */ + } +} + +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 + "envctrl: kenvctrld unable to monitor CPU temp-- exiting\n"); + return -ENODEV; + } + + poll_interval = 5 * HZ; /* TODO env_mon_interval */ + + daemonize("kenvctrld"); + allow_signal(SIGKILL); + + kenvctrld_task = current; + + printk(KERN_INFO "envctrl: %s starting...\n", current->comm); + for (;;) { + current->state = TASK_INTERRUPTIBLE; + schedule_timeout(poll_interval); + + if(signal_pending(current)) + 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 "envctrl: %s exiting...\n", current->comm); + return 0; +} + +static int __init envctrl_init(void) +{ +#ifdef CONFIG_PCI + struct linux_ebus *ebus = NULL; + struct linux_ebus_device *edev = NULL; + struct linux_ebus_child *edev_child = NULL; + int err, i = 0; + + for_each_ebus(ebus) { + for_each_ebusdev(edev, ebus) { + if (!strcmp(edev->prom_name, "bbc")) { + /* If we find a boot-bus controller node, + * then this envctrl driver is not for us. + */ + return -ENODEV; + } + } + } + + /* Traverse through ebus and ebus device list for i2c device and + * adc and gpio nodes. + */ + for_each_ebus(ebus) { + for_each_ebusdev(edev, ebus) { + if (!strcmp(edev->prom_name, "i2c")) { + i2c = ioremap(edev->resource[0].start, 0x2); + for_each_edevchild(edev, edev_child) { + if (!strcmp("gpio", edev_child->prom_name)) { + i2c_childlist[i].i2ctype = I2C_GPIO; + envctrl_init_i2c_child(edev_child, &(i2c_childlist[i++])); + } + if (!strcmp("adc", edev_child->prom_name)) { + i2c_childlist[i].i2ctype = I2C_ADC; + envctrl_init_i2c_child(edev_child, &(i2c_childlist[i++])); + } + } + goto done; + } + } + } + +done: + if (!edev) { + printk("envctrl: I2C device not found.\n"); + return -ENODEV; + } + + /* 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("envctrl: 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("envctrl: initialized "); + for (--i; i >= 0; --i) { + printk("[%s 0x%lx]%s", + (I2C_ADC == i2c_childlist[i].i2ctype) ? ("adc") : + ((I2C_GPIO == i2c_childlist[i].i2ctype) ? ("gpio") : ("unknown")), + i2c_childlist[i].addr, (0 == i) ? ("\n") : (" ")); + } + + err = kernel_thread(kenvctrld, NULL, CLONE_FS | CLONE_FILES); + if (err < 0) + goto out_deregister; + + return 0; + +out_deregister: + misc_deregister(&envctrl_dev); +out_iounmap: + iounmap(i2c); + for (i = 0; i < ENVCTRL_MAX_CPU * 2; i++) { + if (i2c_childlist[i].tables) + kfree(i2c_childlist[i].tables); + } + return err; +#else + return -ENODEV; +#endif +} + +static void __exit envctrl_cleanup(void) +{ + int i; + + if (NULL != kenvctrld_task) { + force_sig(SIGKILL, kenvctrld_task); + for (;;) { + struct task_struct *p; + int found = 0; + + read_lock(&tasklist_lock); + for_each_process(p) { + if (p == kenvctrld_task) { + found = 1; + break; + } + } + read_unlock(&tasklist_lock); + + if (!found) + break; + + msleep(1000); + } + kenvctrld_task = NULL; + } + + iounmap(i2c); + misc_deregister(&envctrl_dev); + + for (i = 0; i < ENVCTRL_MAX_CPU * 2; i++) { + if (i2c_childlist[i].tables) + kfree(i2c_childlist[i].tables); + } +} + +module_init(envctrl_init); +module_exit(envctrl_cleanup); +MODULE_LICENSE("GPL"); |