From 7804790226276dce0bf9c659bba061d46b5a184a Mon Sep 17 00:00:00 2001 From: Werner Zeh Date: Tue, 12 Jul 2016 07:10:19 +0200 Subject: [PATCH] fsp_broadwell_de: Add SMBus driver for ramstage There is currently a SMBus driver implemented for soc/intel/broadwell which nearly matches Broadwell-DE as well. Use this driver as template and add minor modifications to make it work for Broadwell-DE. Support in romstage is not available and can be added with a different patch. Change-Id: I64649ceaa298994ee36018f5b2b0f5d49cf7ffd0 Signed-off-by: Werner Zeh Reviewed-on: https://review.coreboot.org/15617 Tested-by: build bot (Jenkins) Reviewed-by: Aaron Durbin --- src/soc/intel/fsp_broadwell_de/Makefile.inc | 2 + .../fsp_broadwell_de/include/soc/pci_devs.h | 5 + .../fsp_broadwell_de/include/soc/smbus.h | 48 ++++++ src/soc/intel/fsp_broadwell_de/smbus.c | 105 ++++++++++++ src/soc/intel/fsp_broadwell_de/smbus_common.c | 151 ++++++++++++++++++ 5 files changed, 311 insertions(+) create mode 100644 src/soc/intel/fsp_broadwell_de/include/soc/smbus.h create mode 100644 src/soc/intel/fsp_broadwell_de/smbus.c create mode 100644 src/soc/intel/fsp_broadwell_de/smbus_common.c diff --git a/src/soc/intel/fsp_broadwell_de/Makefile.inc b/src/soc/intel/fsp_broadwell_de/Makefile.inc index a0d5203fc4..41ae43e07e 100644 --- a/src/soc/intel/fsp_broadwell_de/Makefile.inc +++ b/src/soc/intel/fsp_broadwell_de/Makefile.inc @@ -21,6 +21,8 @@ ramstage-y += southcluster.c romstage-y += reset.c ramstage-y += reset.c ramstage-y += acpi.c +ramstage-y += smbus_common.c +ramstage-y += smbus.c ifeq ($(CONFIG_INTEGRATED_UART),y) romstage-y += uart.c diff --git a/src/soc/intel/fsp_broadwell_de/include/soc/pci_devs.h b/src/soc/intel/fsp_broadwell_de/include/soc/pci_devs.h index 99236018c5..5f3cfb963a 100644 --- a/src/soc/intel/fsp_broadwell_de/include/soc/pci_devs.h +++ b/src/soc/intel/fsp_broadwell_de/include/soc/pci_devs.h @@ -38,6 +38,11 @@ #define AHCI_DEVID 0x8C02 #define SATA_DEV_FUNC PCI_DEVFN(SATA_DEV, SATA_FUNC) +#define SMBUS_DEV 31 +#define SMBUS_FUNC 3 +#define SMBUS_DEVID 0x8C22 +#define SMBUS_DEV_FUNC PCI_DEVFN(SMBUS_DEV, SMBUS_FUNC) + #define SATA2_DEV 31 #define SATA2_FUNC 5 #define SATA2_DEV_FUNC PCI_DEVFN(SATA2_DEV, SATA2_FUNC) diff --git a/src/soc/intel/fsp_broadwell_de/include/soc/smbus.h b/src/soc/intel/fsp_broadwell_de/include/soc/smbus.h new file mode 100644 index 0000000000..0a7dbaeeab --- /dev/null +++ b/src/soc/intel/fsp_broadwell_de/include/soc/smbus.h @@ -0,0 +1,48 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2005 Yinghai Lu + * Copyright (C) 2009 coresystems GmbH + * Copyright (C) 2014 Google Inc. + * + * 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; version 2 of the License. + * + * 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. + */ + +#ifndef _BROADWELL_SMBUS_H_ +#define _BROADWELL_SMBUS_H_ + +/* PCI Configuration Space (D31:F3): SMBus */ +#define SMB_BASE 0x20 +#define HOSTC 0x40 +#define HST_EN (1 << 0) +#define SMB_RCV_SLVA 0x09 + +/* SMBus I/O bits. */ +#define SMBHSTSTAT 0x0 +#define SMBHSTCTL 0x2 +#define SMBHSTCMD 0x3 +#define SMBXMITADD 0x4 +#define SMBHSTDAT0 0x5 +#define SMBHSTDAT1 0x6 +#define SMBBLKDAT 0x7 +#define SMBTRNSADD 0x9 +#define SMBSLVDATA 0xa +#define SMLINK_PIN_CTL 0xe +#define SMBUS_PIN_CTL 0xf + +#define SMBUS_TIMEOUT (10 * 1000 * 100) +#define SMBUS_SLAVE_ADDR 0x24 + +int do_smbus_read_byte(unsigned smbus_base, unsigned device, + unsigned address); +int do_smbus_write_byte(unsigned smbus_base, unsigned device, + unsigned address, unsigned data); + +#endif diff --git a/src/soc/intel/fsp_broadwell_de/smbus.c b/src/soc/intel/fsp_broadwell_de/smbus.c new file mode 100644 index 0000000000..480e49789e --- /dev/null +++ b/src/soc/intel/fsp_broadwell_de/smbus.c @@ -0,0 +1,105 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2008-2009 coresystems GmbH + * Copyright (C) 2014 Google Inc. + * Copyright (C) 2016 Siemens AG + * + * 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; version 2 of the License. + * + * 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. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +static void pch_smbus_init(device_t dev) +{ + struct resource *res; + uint32_t reg32; + device_t lpc_dev = dev_find_slot(0, LPC_DEV_FUNC); + void *rcba = (void *)pci_read_config32(lpc_dev, 0xf0); + + /* Enable clock gating */ + reg32 =read32(rcba + 0x341c); + reg32 |= (1 << 5); + write32(rcba + 0x341c, reg32); + + /* Set Receive Slave Address */ + res = find_resource(dev, PCI_BASE_ADDRESS_4); + if (res) + outb(SMBUS_SLAVE_ADDR, res->base + SMB_RCV_SLVA); +} + +static void pch_smbus_enable(device_t dev) +{ + uint8_t reg8; + + reg8 = pci_read_config8(dev, HOSTC); + reg8 |= HST_EN; + pci_write_config8(dev, HOSTC, reg8); +} + +static int lsmbus_read_byte(device_t dev, uint8_t address) +{ + uint16_t device; + struct resource *res; + struct bus *pbus; + + device = dev->path.i2c.device; + pbus = get_pbus_smbus(dev); + res = find_resource(pbus->dev, PCI_BASE_ADDRESS_4); + + return do_smbus_read_byte(res->base, device, address); +} + +static int lsmbus_write_byte(device_t dev, uint8_t address, uint8_t data) +{ + uint16_t device; + struct resource *res; + struct bus *pbus; + + device = dev->path.i2c.device; + pbus = get_pbus_smbus(dev); + res = find_resource(pbus->dev, PCI_BASE_ADDRESS_4); + return do_smbus_write_byte(res->base, device, address, data); +} + +static struct smbus_bus_operations lops_smbus_bus = { + .read_byte = lsmbus_read_byte, + .write_byte = lsmbus_write_byte, +}; + +static struct device_operations smbus_ops = { + .read_resources = &pci_dev_read_resources, + .set_resources = &pci_dev_set_resources, + .enable_resources = &pci_dev_enable_resources, + .scan_bus = &scan_smbus, + .init = &pch_smbus_init, + .enable = &pch_smbus_enable, + .ops_smbus_bus = &lops_smbus_bus, +}; + +static const unsigned short pci_device_ids[] = { + SMBUS_DEVID, + 0 +}; + +static const struct pci_driver pch_smbus __pci_driver = { + .ops = &smbus_ops, + .vendor = PCI_VENDOR_ID_INTEL, + .devices = pci_device_ids, +}; diff --git a/src/soc/intel/fsp_broadwell_de/smbus_common.c b/src/soc/intel/fsp_broadwell_de/smbus_common.c new file mode 100644 index 0000000000..26bb4fd704 --- /dev/null +++ b/src/soc/intel/fsp_broadwell_de/smbus_common.c @@ -0,0 +1,151 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2005 Yinghai Lu + * Copyright (C) 2008-2009 coresystems GmbH + * Copyright (C) 2014 Google Inc. + * + * 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; version 2 of the License. + * + * 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. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +static void smbus_delay(void) +{ + inb(0x80); +} + +static int smbus_wait_until_ready(u16 smbus_base) +{ + unsigned loops = SMBUS_TIMEOUT; + unsigned char byte; + do { + smbus_delay(); + if (--loops == 0) + break; + byte = inb(smbus_base + SMBHSTSTAT); + } while (byte & 1); + return loops ? 0 : -1; +} + +static int smbus_wait_until_done(u16 smbus_base) +{ + unsigned loops = SMBUS_TIMEOUT; + unsigned char byte; + do { + smbus_delay(); + if (--loops == 0) + break; + byte = inb(smbus_base + SMBHSTSTAT); + } while ((byte & 1) || (byte & ~((1 << 6) | (1 << 0))) == 0); + return loops ? 0 : -1; +} + +int do_smbus_read_byte(unsigned smbus_base, unsigned device, unsigned address) +{ + unsigned char global_status_register; + unsigned char byte; + + if (smbus_wait_until_ready(smbus_base) < 0) { + return SMBUS_WAIT_UNTIL_READY_TIMEOUT; + } + /* Setup transaction */ + /* Disable interrupts */ + outb(inb(smbus_base + SMBHSTCTL) & (~1), smbus_base + SMBHSTCTL); + /* Set the device I'm talking too */ + outb(((device & 0x7f) << 1) | 1, smbus_base + SMBXMITADD); + /* Set the command/address... */ + outb(address & 0xff, smbus_base + SMBHSTCMD); + /* Set up for a byte data read */ + outb((inb(smbus_base + SMBHSTCTL) & 0xe3) | (0x2 << 2), + (smbus_base + SMBHSTCTL)); + /* Clear any lingering errors, so the transaction will run */ + outb(inb(smbus_base + SMBHSTSTAT), smbus_base + SMBHSTSTAT); + + /* Clear the data byte... */ + outb(0, smbus_base + SMBHSTDAT0); + + /* Start the command */ + outb((inb(smbus_base + SMBHSTCTL) | 0x40), + smbus_base + SMBHSTCTL); + + /* Poll for transaction completion */ + if (smbus_wait_until_done(smbus_base) < 0) { + return SMBUS_WAIT_UNTIL_DONE_TIMEOUT; + } + + global_status_register = inb(smbus_base + SMBHSTSTAT); + + /* Ignore the "In Use" status... */ + global_status_register &= ~(3 << 5); + + /* Read results of transaction */ + byte = inb(smbus_base + SMBHSTDAT0); + if (global_status_register != (1 << 1)) { + return SMBUS_ERROR; + } + return byte; +} + +int do_smbus_write_byte(unsigned smbus_base, unsigned device, + unsigned address, unsigned data) +{ + unsigned char global_status_register; + + if (smbus_wait_until_ready(smbus_base) < 0) + return SMBUS_WAIT_UNTIL_READY_TIMEOUT; + + /* Setup transaction */ + /* Disable interrupts */ + outb(inb(smbus_base + SMBHSTCTL) & (~1), smbus_base + SMBHSTCTL); + /* Set the device I'm talking too */ + outb(((device & 0x7f) << 1) & ~0x01, smbus_base + SMBXMITADD); + /* Set the command/address... */ + outb(address & 0xff, smbus_base + SMBHSTCMD); + /* Set up for a byte data read */ + outb((inb(smbus_base + SMBHSTCTL) & 0xe3) | (0x2 << 2), + (smbus_base + SMBHSTCTL)); + /* Clear any lingering errors, so the transaction will run */ + outb(inb(smbus_base + SMBHSTSTAT), smbus_base + SMBHSTSTAT); + + /* Clear the data byte... */ + outb(data, smbus_base + SMBHSTDAT0); + + /* Start the command */ + outb((inb(smbus_base + SMBHSTCTL) | 0x40), + smbus_base + SMBHSTCTL); + + /* Poll for transaction completion */ + if (smbus_wait_until_done(smbus_base) < 0) { + printk(BIOS_ERR, "SMBUS transaction timeout\n"); + return SMBUS_WAIT_UNTIL_DONE_TIMEOUT; + } + + global_status_register = inb(smbus_base + SMBHSTSTAT); + + /* Ignore the "In Use" status... */ + global_status_register &= ~(3 << 5); + + /* Read results of transaction */ + if (global_status_register != (1 << 1)) { + printk(BIOS_ERR, "SMBUS transaction error\n"); + return SMBUS_ERROR; + } + + return 0; +}