/*************************************************************************** * Copyright (C) 2010-2011 Hans de Goede * * * * 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., * * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * ***************************************************************************/ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include #include #include #include #include #include #include #include "sch56xx-common.h" #define SIO_SCH56XX_LD_EM 0x0C /* Embedded uController Logical Dev */ #define SIO_UNLOCK_KEY 0x55 /* Key to enable Super-I/O */ #define SIO_LOCK_KEY 0xAA /* Key to disable Super-I/O */ #define SIO_REG_LDSEL 0x07 /* Logical device select */ #define SIO_REG_DEVID 0x20 /* Device ID */ #define SIO_REG_ENABLE 0x30 /* Logical device enable */ #define SIO_REG_ADDR 0x66 /* Logical device address (2 bytes) */ #define SIO_SCH5627_ID 0xC6 /* Chipset ID */ #define SIO_SCH5636_ID 0xC7 /* Chipset ID */ #define REGION_LENGTH 9 #define SCH56XX_CMD_READ 0x02 #define SCH56XX_CMD_WRITE 0x03 static struct platform_device *sch56xx_pdev; /* Super I/O functions */ static inline int superio_inb(int base, int reg) { outb(reg, base); return inb(base + 1); } static inline int superio_enter(int base) { /* Don't step on other drivers' I/O space by accident */ if (!request_muxed_region(base, 2, "sch56xx")) { pr_err("I/O address 0x%04x already in use\n", base); return -EBUSY; } outb(SIO_UNLOCK_KEY, base); return 0; } static inline void superio_select(int base, int ld) { outb(SIO_REG_LDSEL, base); outb(ld, base + 1); } static inline void superio_exit(int base) { outb(SIO_LOCK_KEY, base); release_region(base, 2); } static int sch56xx_send_cmd(u16 addr, u8 cmd, u16 reg, u8 v) { u8 val; int i; /* * According to SMSC for the commands we use the maximum time for * the EM to respond is 15 ms, but testing shows in practice it * responds within 15-32 reads, so we first busy poll, and if * that fails sleep a bit and try again until we are way past * the 15 ms maximum response time. */ const int max_busy_polls = 64; const int max_lazy_polls = 32; /* (Optional) Write-Clear the EC to Host Mailbox Register */ val = inb(addr + 1); outb(val, addr + 1); /* Set Mailbox Address Pointer to first location in Region 1 */ outb(0x00, addr + 2); outb(0x80, addr + 3); /* Write Request Packet Header */ outb(cmd, addr + 4); /* VREG Access Type read:0x02 write:0x03 */ outb(0x01, addr + 5); /* # of Entries: 1 Byte (8-bit) */ outb(0x04, addr + 2); /* Mailbox AP to first data entry loc. */ /* Write Value field */ if (cmd == SCH56XX_CMD_WRITE) outb(v, addr + 4); /* Write Address field */ outb(reg & 0xff, addr + 6); outb(reg >> 8, addr + 7); /* Execute the Random Access Command */ outb(0x01, addr); /* Write 01h to the Host-to-EC register */ /* EM Interface Polling "Algorithm" */ for (i = 0; i < max_busy_polls + max_lazy_polls; i++) { if (i >= max_busy_polls) msleep(1); /* Read Interrupt source Register */ val = inb(addr + 8); /* Write Clear the interrupt source bits */ if (val) outb(val, addr + 8); /* Command Completed ? */ if (val & 0x01) break; } if (i == max_busy_polls + max_lazy_polls) { pr_err("Max retries exceeded reading virtual " "register 0x%04hx (%d)\n", reg, 1); return -EIO; } /* * According to SMSC we may need to retry this, but sofar I've always * seen this succeed in 1 try. */ for (i = 0; i < max_busy_polls; i++) { /* Read EC-to-Host Register */ val = inb(addr + 1); /* Command Completed ? */ if (val == 0x01) break; if (i == 0) pr_warn("EC reports: 0x%02x reading virtual register " "0x%04hx\n", (unsigned int)val, reg); } if (i == max_busy_polls) { pr_err("Max retries exceeded reading virtual " "register 0x%04hx (%d)\n", reg, 2); return -EIO; } /* * According to the SMSC app note we should now do: * * Set Mailbox Address Pointer to first location in Region 1 * * outb(0x00, addr + 2); * outb(0x80, addr + 3); * * But if we do that things don't work, so let's not. */ /* Read Value field */ if (cmd == SCH56XX_CMD_READ) return inb(addr + 4); return 0; } int sch56xx_read_virtual_reg(u16 addr, u16 reg) { return sch56xx_send_cmd(addr, SCH56XX_CMD_READ, reg, 0); } EXPORT_SYMBOL(sch56xx_read_virtual_reg); int sch56xx_write_virtual_reg(u16 addr, u16 reg, u8 val) { return sch56xx_send_cmd(addr, SCH56XX_CMD_WRITE, reg, val); } EXPORT_SYMBOL(sch56xx_write_virtual_reg); int sch56xx_read_virtual_reg16(u16 addr, u16 reg) { int lsb, msb; /* Read LSB first, this will cause the matching MSB to be latched */ lsb = sch56xx_read_virtual_reg(addr, reg); if (lsb < 0) return lsb; msb = sch56xx_read_virtual_reg(addr, reg + 1); if (msb < 0) return msb; return lsb | (msb << 8); } EXPORT_SYMBOL(sch56xx_read_virtual_reg16); int sch56xx_read_virtual_reg12(u16 addr, u16 msb_reg, u16 lsn_reg, int high_nibble) { int msb, lsn; /* Read MSB first, this will cause the matching LSN to be latched */ msb = sch56xx_read_virtual_reg(addr, msb_reg); if (msb < 0) return msb; lsn = sch56xx_read_virtual_reg(addr, lsn_reg); if (lsn < 0) return lsn; if (high_nibble) return (msb << 4) | (lsn >> 4); else return (msb << 4) | (lsn & 0x0f); } EXPORT_SYMBOL(sch56xx_read_virtual_reg12); static int __init sch56xx_find(int sioaddr, unsigned short *address, const char **name) { u8 devid; int err; err = superio_enter(sioaddr); if (err) return err; devid = superio_inb(sioaddr, SIO_REG_DEVID); switch (devid) { case SIO_SCH5627_ID: *name = "sch5627"; break; case SIO_SCH5636_ID: *name = "sch5636"; break; default: pr_debug("Unsupported device id: 0x%02x\n", (unsigned int)devid); err = -ENODEV; goto exit; } superio_select(sioaddr, SIO_SCH56XX_LD_EM); if (!(superio_inb(sioaddr, SIO_REG_ENABLE) & 0x01)) { pr_warn("Device not activated\n"); err = -ENODEV; goto exit; } /* * Warning the order of the low / high byte is the other way around * as on most other superio devices!! */ *address = superio_inb(sioaddr, SIO_REG_ADDR) | superio_inb(sioaddr, SIO_REG_ADDR + 1) << 8; if (*address == 0) { pr_warn("Base address not set\n"); err = -ENODEV; goto exit; } exit: superio_exit(sioaddr); return err; } static int __init sch56xx_device_add(unsigned short address, const char *name) { struct resource res = { .start = address, .end = address + REGION_LENGTH - 1, .flags = IORESOURCE_IO, }; int err; sch56xx_pdev = platform_device_alloc(name, address); if (!sch56xx_pdev) return -ENOMEM; res.name = sch56xx_pdev->name; err = acpi_check_resource_conflict(&res); if (err) goto exit_device_put; err = platform_device_add_resources(sch56xx_pdev, &res, 1); if (err) { pr_err("Device resource addition failed\n"); goto exit_device_put; } err = platform_device_add(sch56xx_pdev); if (err) { pr_err("Device addition failed\n"); goto exit_device_put; } return 0; exit_device_put: platform_device_put(sch56xx_pdev); return err; } static int __init sch56xx_init(void) { int err; unsigned short address; const char *name; err = sch56xx_find(0x4e, &address, &name); if (err) err = sch56xx_find(0x2e, &address, &name); if (err) return err; return sch56xx_device_add(address, name); } static void __exit sch56xx_exit(void) { platform_device_unregister(sch56xx_pdev); } MODULE_DESCRIPTION("SMSC SCH56xx Hardware Monitoring Common Code"); MODULE_AUTHOR("Hans de Goede "); MODULE_LICENSE("GPL"); module_init(sch56xx_init); module_exit(sch56xx_exit);