^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) i2c Support for Via Technologies 82C586B South Bridge
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) Copyright (c) 1998, 1999 Kyösti Mälkki <kmalkki@cc.hut.fi>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/pci.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/ioport.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/i2c.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/i2c-algo-bit.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) /* Power management registers */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #define PM_CFG_REVID 0x08 /* silicon revision code */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #define PM_CFG_IOBASE0 0x20
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #define PM_CFG_IOBASE1 0x48
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #define I2C_DIR (pm_io_base+0x40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #define I2C_OUT (pm_io_base+0x42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #define I2C_IN (pm_io_base+0x44)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #define I2C_SCL 0x02 /* clock bit in DIR/OUT/IN register */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #define I2C_SDA 0x04
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) /* io-region reservation */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #define IOSPACE 0x06
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) static struct pci_driver vt586b_driver;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) static u16 pm_io_base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) It does not appear from the datasheet that the GPIO pins are
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) open drain. So a we set a low value by setting the direction to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) output and a high value by setting the direction to input and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) relying on the required I2C pullup. The data value is initialized
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) to 0 in via_init() and never changed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) static void bit_via_setscl(void *data, int state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) outb(state ? inb(I2C_DIR) & ~I2C_SCL : inb(I2C_DIR) | I2C_SCL, I2C_DIR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) static void bit_via_setsda(void *data, int state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) outb(state ? inb(I2C_DIR) & ~I2C_SDA : inb(I2C_DIR) | I2C_SDA, I2C_DIR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) static int bit_via_getscl(void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) return (0 != (inb(I2C_IN) & I2C_SCL));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) static int bit_via_getsda(void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) return (0 != (inb(I2C_IN) & I2C_SDA));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) static struct i2c_algo_bit_data bit_data = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) .setsda = bit_via_setsda,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) .setscl = bit_via_setscl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) .getsda = bit_via_getsda,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) .getscl = bit_via_getscl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) .udelay = 5,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) .timeout = HZ
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) static struct i2c_adapter vt586b_adapter = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) .class = I2C_CLASS_HWMON | I2C_CLASS_SPD,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) .name = "VIA i2c",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) .algo_data = &bit_data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) static const struct pci_device_id vt586b_ids[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C586_3) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) { 0, }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) MODULE_DEVICE_TABLE (pci, vt586b_ids);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) static int vt586b_probe(struct pci_dev *dev, const struct pci_device_id *id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) u16 base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) u8 rev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) int res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) if (pm_io_base) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) dev_err(&dev->dev, "i2c-via: Will only support one host\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) pci_read_config_byte(dev, PM_CFG_REVID, &rev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) switch (rev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) case 0x00:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) base = PM_CFG_IOBASE0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) case 0x01:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) case 0x10:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) base = PM_CFG_IOBASE1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) base = PM_CFG_IOBASE1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) /* later revision */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) pci_read_config_word(dev, base, &pm_io_base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) pm_io_base &= (0xff << 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) if (!request_region(I2C_DIR, IOSPACE, vt586b_driver.name)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) dev_err(&dev->dev, "IO 0x%x-0x%x already in use\n", I2C_DIR, I2C_DIR + IOSPACE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) outb(inb(I2C_DIR) & ~(I2C_SDA | I2C_SCL), I2C_DIR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) outb(inb(I2C_OUT) & ~(I2C_SDA | I2C_SCL), I2C_OUT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) /* set up the sysfs linkage to our parent device */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) vt586b_adapter.dev.parent = &dev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) res = i2c_bit_add_bus(&vt586b_adapter);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) if ( res < 0 ) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) release_region(I2C_DIR, IOSPACE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) pm_io_base = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) return res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) static void vt586b_remove(struct pci_dev *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) i2c_del_adapter(&vt586b_adapter);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) release_region(I2C_DIR, IOSPACE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) pm_io_base = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) static struct pci_driver vt586b_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) .name = "vt586b_smbus",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) .id_table = vt586b_ids,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) .probe = vt586b_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) .remove = vt586b_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) module_pci_driver(vt586b_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) MODULE_AUTHOR("Kyösti Mälkki <kmalkki@cc.hut.fi>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) MODULE_DESCRIPTION("i2c for Via vt82c586b southbridge");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) MODULE_LICENSE("GPL");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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