Mario Scheithauer | 7fd20be | 2017-05-08 16:09:26 +0200 | [diff] [blame^] | 1 | /* |
| 2 | * This file is part of the coreboot project. |
| 3 | * |
| 4 | * Copyright 2017 Siemens AG. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; version 2 of the License. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | */ |
| 15 | |
| 16 | #include <device/i2c.h> |
| 17 | #include <device/device.h> |
| 18 | #include <version.h> |
| 19 | #include <console/console.h> |
| 20 | #include <bcd.h> |
| 21 | #include "chip.h" |
| 22 | #include "rx6110sa.h" |
| 23 | |
| 24 | #define I2C_BUS_NUM (dev->bus->secondary - 1) |
| 25 | #define I2C_DEV_NUM (dev->path.i2c.device) |
| 26 | |
| 27 | /* Set RTC date from coreboot build date. */ |
| 28 | static void rx6110sa_set_build_date(struct device *dev) |
| 29 | { |
| 30 | i2c_writeb(I2C_BUS_NUM, I2C_DEV_NUM, YEAR_REG, |
| 31 | coreboot_build_date.year); |
| 32 | i2c_writeb(I2C_BUS_NUM, I2C_DEV_NUM, MONTH_REG, |
| 33 | coreboot_build_date.month); |
| 34 | i2c_writeb(I2C_BUS_NUM, I2C_DEV_NUM, DAY_REG, |
| 35 | coreboot_build_date.day); |
| 36 | i2c_writeb(I2C_BUS_NUM, I2C_DEV_NUM, WEEK_REG, |
| 37 | (1 << coreboot_build_date.weekday)); |
| 38 | } |
| 39 | |
| 40 | /* Set RTC date from user defined date (available in e.g. device tree). */ |
| 41 | static void rx6110sa_set_user_date(struct device *dev) |
| 42 | { |
| 43 | struct drivers_i2c_rx6110sa_config *config = dev->chip_info; |
| 44 | |
| 45 | i2c_writeb(I2C_BUS_NUM, I2C_DEV_NUM, YEAR_REG, |
| 46 | bin2bcd(config->user_year)); |
| 47 | i2c_writeb(I2C_BUS_NUM, I2C_DEV_NUM, MONTH_REG, |
| 48 | bin2bcd(config->user_month)); |
| 49 | i2c_writeb(I2C_BUS_NUM, I2C_DEV_NUM, DAY_REG, |
| 50 | bin2bcd(config->user_day)); |
| 51 | i2c_writeb(I2C_BUS_NUM, I2C_DEV_NUM, WEEK_REG, |
| 52 | (1 << config->user_weekday)); |
| 53 | } |
| 54 | |
| 55 | static void rx6110sa_final(struct device *dev) |
| 56 | { |
| 57 | uint8_t hour, minute, second, year, month, day; |
| 58 | |
| 59 | /* Read back current RTC date and time and print it to the console. */ |
| 60 | i2c_readb(I2C_BUS_NUM, I2C_DEV_NUM, HOUR_REG, &hour); |
| 61 | i2c_readb(I2C_BUS_NUM, I2C_DEV_NUM, MINUTE_REG, &minute); |
| 62 | i2c_readb(I2C_BUS_NUM, I2C_DEV_NUM, SECOND_REG, &second); |
| 63 | i2c_readb(I2C_BUS_NUM, I2C_DEV_NUM, YEAR_REG, &year); |
| 64 | i2c_readb(I2C_BUS_NUM, I2C_DEV_NUM, MONTH_REG, &month); |
| 65 | i2c_readb(I2C_BUS_NUM, I2C_DEV_NUM, DAY_REG, &day); |
| 66 | |
| 67 | printk(BIOS_INFO, "%s: Current date %02d.%02d.%02d %02d:%02d:%02d\n", |
| 68 | dev->chip_ops->name, bcd2bin(month), bcd2bin(day), |
| 69 | bcd2bin(year), bcd2bin(hour), bcd2bin(minute), bcd2bin(second)); |
| 70 | } |
| 71 | |
| 72 | static void rx6110sa_init(struct device *dev) |
| 73 | { |
| 74 | struct drivers_i2c_rx6110sa_config *config = dev->chip_info; |
| 75 | uint8_t reg; |
| 76 | |
| 77 | /* Do a dummy read first. */ |
| 78 | i2c_readb(I2C_BUS_NUM, I2C_DEV_NUM, SECOND_REG, ®); |
| 79 | |
| 80 | /* |
| 81 | * Check VLF-bit which indicates the RTC data loss, such as due to a |
| 82 | * supply voltage drop. |
| 83 | */ |
| 84 | i2c_readb(I2C_BUS_NUM, I2C_DEV_NUM, FLAG_REGISTER, ®); |
| 85 | |
| 86 | if (!(reg & VLF_BIT)) |
| 87 | /* No voltage low detected, everything is well. */ |
| 88 | return; |
| 89 | |
| 90 | /* |
| 91 | * Voltage low detected, initialize RX6110 SA again. |
| 92 | * Set first some registers to known state. |
| 93 | */ |
| 94 | i2c_writeb(I2C_BUS_NUM, I2C_DEV_NUM, BATTERY_BACKUP_REG, 0x00); |
| 95 | i2c_writeb(I2C_BUS_NUM, I2C_DEV_NUM, RESERVED_BIT_REG, RTC_INIT_VALUE); |
| 96 | i2c_writeb(I2C_BUS_NUM, I2C_DEV_NUM, DIGITAL_REG, 0x00); |
| 97 | i2c_writeb(I2C_BUS_NUM, I2C_DEV_NUM, IRQ_CONTROL_REG, 0x00); |
| 98 | |
| 99 | /* Clear timer enable bit and set frequency of clock output. */ |
| 100 | i2c_readb(I2C_BUS_NUM, I2C_DEV_NUM, EXTENSION_REG, ®); |
| 101 | reg &= ~(FSEL_MASK | TE_BIT); |
| 102 | reg |= (config->cof_selection << 6); |
| 103 | i2c_writeb(I2C_BUS_NUM, I2C_DEV_NUM, EXTENSION_REG, reg); |
| 104 | |
| 105 | /* Clear voltage low detect bit. */ |
| 106 | i2c_readb(I2C_BUS_NUM, I2C_DEV_NUM, FLAG_REGISTER, ®); |
| 107 | reg &= ~VLF_BIT; |
| 108 | i2c_writeb(I2C_BUS_NUM, I2C_DEV_NUM, FLAG_REGISTER, reg); |
| 109 | |
| 110 | /* Before setting the clock stop oscillator. */ |
| 111 | i2c_writeb(I2C_BUS_NUM, I2C_DEV_NUM, CTRL_REG, STOP_BIT); |
| 112 | if (config->set_user_date) { |
| 113 | /* Set user date defined in device tree. */ |
| 114 | printk(BIOS_DEBUG, "%s: Set to user date\n", |
| 115 | dev->chip_ops->name); |
| 116 | rx6110sa_set_user_date(dev); |
| 117 | } else { |
| 118 | /* Set date from coreboot build. */ |
| 119 | printk(BIOS_DEBUG, "%s: Set to coreboot build date\n", |
| 120 | dev->chip_ops->name); |
| 121 | rx6110sa_set_build_date(dev); |
| 122 | } |
| 123 | i2c_writeb(I2C_BUS_NUM, I2C_DEV_NUM, HOUR_REG, 1); |
| 124 | i2c_writeb(I2C_BUS_NUM, I2C_DEV_NUM, MINUTE_REG, 0); |
| 125 | i2c_writeb(I2C_BUS_NUM, I2C_DEV_NUM, SECOND_REG, 0); |
| 126 | /* Start oscillator again as the RTC is set up now. */ |
| 127 | i2c_writeb(I2C_BUS_NUM, I2C_DEV_NUM, CTRL_REG, 0x00); |
| 128 | } |
| 129 | |
| 130 | static struct device_operations rx6110sa_ops = { |
| 131 | .read_resources = DEVICE_NOOP, |
| 132 | .set_resources = DEVICE_NOOP, |
| 133 | .enable_resources = DEVICE_NOOP, |
| 134 | .init = rx6110sa_init, |
| 135 | .final = rx6110sa_final |
| 136 | }; |
| 137 | |
| 138 | static void rx6110sa_enable(struct device *dev) |
| 139 | { |
| 140 | dev->ops = &rx6110sa_ops; |
| 141 | } |
| 142 | |
| 143 | struct chip_operations drivers_i2c_rx6110sa_ops = { |
| 144 | CHIP_NAME("RX6110 SA") |
| 145 | .enable_dev = rx6110sa_enable |
| 146 | }; |