Kyösti Mälkki | c5cc9f2 | 2014-10-17 22:33:22 +0300 | [diff] [blame] | 1 | /* |
| 2 | * This file is part of the coreboot project. |
| 3 | * |
| 4 | * Copyright (C) 2012 Advanced Micro Devices, Inc. |
| 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. |
Kyösti Mälkki | c5cc9f2 | 2014-10-17 22:33:22 +0300 | [diff] [blame] | 14 | */ |
| 15 | |
Michał Żygowski | 287ce5f | 2019-12-01 17:41:23 +0100 | [diff] [blame^] | 16 | #include <amdblocks/acpimmio.h> |
Kyösti Mälkki | c5cc9f2 | 2014-10-17 22:33:22 +0300 | [diff] [blame] | 17 | #include <device/pci_def.h> |
| 18 | #include <device/device.h> |
Elyes HAOUAS | 20eaef0 | 2019-03-29 17:45:28 +0100 | [diff] [blame] | 19 | #include <console/console.h> |
Kyösti Mälkki | c5cc9f2 | 2014-10-17 22:33:22 +0300 | [diff] [blame] | 20 | /* warning: Porting.h includes an open #pragma pack(1) */ |
Elyes HAOUAS | 19f5ba8 | 2018-10-14 14:52:06 +0200 | [diff] [blame] | 21 | #include <Porting.h> |
| 22 | #include <AGESA.h> |
| 23 | #include <amdlib.h> |
Kyösti Mälkki | c5cc9f2 | 2014-10-17 22:33:22 +0300 | [diff] [blame] | 24 | #include <northbridge/amd/agesa/dimmSpd.h> |
| 25 | |
| 26 | /*----------------------------------------------------------------------------- |
| 27 | * |
| 28 | * readSmbusByteData - read a single SPD byte from any offset |
| 29 | */ |
| 30 | |
| 31 | static int readSmbusByteData (int iobase, int address, char *buffer, int offset) |
| 32 | { |
| 33 | unsigned int status; |
| 34 | UINT64 limit; |
| 35 | |
| 36 | address |= 1; // set read bit |
| 37 | |
| 38 | __outbyte (iobase + 0, 0xFF); // clear error status |
| 39 | __outbyte (iobase + 1, 0x1F); // clear error status |
| 40 | __outbyte (iobase + 3, offset); // offset in eeprom |
| 41 | __outbyte (iobase + 4, address); // slave address and read bit |
| 42 | __outbyte (iobase + 2, 0x48); // read byte command |
| 43 | |
| 44 | // time limit to avoid hanging for unexpected error status (should never happen) |
| 45 | limit = __rdtsc () + 2000000000 / 10; |
| 46 | for (;;) |
| 47 | { |
| 48 | status = __inbyte (iobase); |
| 49 | if (__rdtsc () > limit) break; |
| 50 | if ((status & 2) == 0) continue; // SMBusInterrupt not set, keep waiting |
| 51 | if ((status & 1) == 1) continue; // HostBusy set, keep waiting |
| 52 | break; |
| 53 | } |
| 54 | |
| 55 | buffer [0] = __inbyte (iobase + 5); |
| 56 | if (status == 2) status = 0; // check for done with no errors |
| 57 | return status; |
| 58 | } |
| 59 | |
| 60 | /*----------------------------------------------------------------------------- |
| 61 | * |
| 62 | * readSmbusByte - read a single SPD byte from the default offset |
| 63 | * this function is faster function readSmbusByteData |
| 64 | */ |
| 65 | |
| 66 | static int readSmbusByte (int iobase, int address, char *buffer) |
| 67 | { |
| 68 | unsigned int status; |
| 69 | UINT64 limit; |
| 70 | |
| 71 | __outbyte (iobase + 0, 0xFF); // clear error status |
| 72 | __outbyte (iobase + 2, 0x44); // read command |
| 73 | |
| 74 | // time limit to avoid hanging for unexpected error status |
| 75 | limit = __rdtsc () + 2000000000 / 10; |
| 76 | for (;;) |
| 77 | { |
| 78 | status = __inbyte (iobase); |
| 79 | if (__rdtsc () > limit) break; |
| 80 | if ((status & 2) == 0) continue; // SMBusInterrupt not set, keep waiting |
| 81 | if ((status & 1) == 1) continue; // HostBusy set, keep waiting |
| 82 | break; |
| 83 | } |
| 84 | |
| 85 | buffer [0] = __inbyte (iobase + 5); |
| 86 | if (status == 2) status = 0; // check for done with no errors |
| 87 | return status; |
| 88 | } |
| 89 | |
| 90 | /*--------------------------------------------------------------------------- |
| 91 | * |
| 92 | * readspd - Read one or more SPD bytes from a DIMM. |
| 93 | * Start with offset zero and read sequentially. |
| 94 | * Optimization relies on autoincrement to avoid |
| 95 | * sending offset for every byte. |
| 96 | * Reads 128 bytes in 7-8 ms at 400 KHz. |
| 97 | */ |
| 98 | |
| 99 | static int readspd (int iobase, int SmbusSlaveAddress, char *buffer, int count) |
| 100 | { |
| 101 | int index, error; |
| 102 | |
| 103 | printk(BIOS_SPEW, "-------------READING SPD-----------\n"); |
| 104 | printk(BIOS_SPEW, "iobase: 0x%08X, SmbusSlave: 0x%08X, count: %d\n", |
| 105 | iobase, SmbusSlaveAddress, count); |
| 106 | |
| 107 | /* read the first byte using offset zero */ |
| 108 | error = readSmbusByteData (iobase, SmbusSlaveAddress, buffer, 0); |
| 109 | |
| 110 | if (error) { |
| 111 | printk(BIOS_ERR, "-------------SPD READ ERROR-----------\n"); |
| 112 | return error; |
| 113 | } |
| 114 | |
| 115 | /* read the remaining bytes using auto-increment for speed */ |
| 116 | for (index = 1; index < count; index++) |
| 117 | { |
| 118 | error = readSmbusByte (iobase, SmbusSlaveAddress, &buffer [index]); |
| 119 | if (error) { |
| 120 | printk(BIOS_ERR, "-------------SPD READ ERROR-----------\n"); |
| 121 | return error; |
| 122 | } |
| 123 | } |
| 124 | printk(BIOS_SPEW, "\n"); |
| 125 | printk(BIOS_SPEW, "-------------FINISHED READING SPD-----------\n"); |
| 126 | |
| 127 | return 0; |
| 128 | } |
| 129 | |
Kyösti Mälkki | c5cc9f2 | 2014-10-17 22:33:22 +0300 | [diff] [blame] | 130 | static void setupFch (int ioBase) |
| 131 | { |
Michał Żygowski | 287ce5f | 2019-12-01 17:41:23 +0100 | [diff] [blame^] | 132 | pm_write16(0x2c, ioBase | 1); |
Kyösti Mälkki | c5cc9f2 | 2014-10-17 22:33:22 +0300 | [diff] [blame] | 133 | __outbyte (ioBase + 0x0E, 66000000 / 400000 / 4); // set SMBus clock to 400 KHz |
| 134 | } |
| 135 | |
| 136 | int hudson_readSpd(int spdAddress, char *buf, size_t len) |
| 137 | { |
| 138 | int ioBase = 0xB00; |
| 139 | setupFch (ioBase); |
| 140 | return readspd (ioBase, spdAddress, buf, len); |
| 141 | } |