diff options
author | Aamir Bohra <aamir.bohra@intel.com> | 2017-04-19 18:19:14 +0530 |
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committer | Martin Roth <martinroth@google.com> | 2017-05-08 17:49:38 +0200 |
commit | 52f29743b153e89ca38db5d7a207c676c4c70207 (patch) | |
tree | afb48119cd2a2d8173a9104adc5b131ca41d6f71 /src/soc/intel/common/block/smbus/smbus.c | |
parent | 1f355178d6b05c9ba14c010b4304835801345f6a (diff) |
soc/intel/common/block: Add Intel common SMBus code
Add below code support under intel/common/block:
* SMBus read/write byte APIs
* Common SMBus initialization code
Change-Id: I936143a334c31937d557c6828e5876d35b133567
Signed-off-by: Aamir Bohra <aamir.bohra@intel.com>
Reviewed-on: https://review.coreboot.org/19372
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Diffstat (limited to 'src/soc/intel/common/block/smbus/smbus.c')
-rw-r--r-- | src/soc/intel/common/block/smbus/smbus.c | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/src/soc/intel/common/block/smbus/smbus.c b/src/soc/intel/common/block/smbus/smbus.c new file mode 100644 index 0000000000..cd066ace58 --- /dev/null +++ b/src/soc/intel/common/block/smbus/smbus.c @@ -0,0 +1,101 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2017 Intel Corporation. + * + * 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 <device/device.h> +#include <device/path.h> +#include <device/smbus.h> +#include <device/pci.h> +#include <device/pci_ids.h> +#include <device/pci_ops.h> +#include <soc/smbus.h> +#include "smbuslib.h" + +static int lsmbus_read_byte(device_t dev, u8 address) +{ + u16 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 smbus_read8(res->base, device, address); +} + +static int lsmbus_write_byte(device_t dev, u8 address, u8 data) +{ + u16 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 smbus_write8(res->base, device, address, data); +} + +static struct smbus_bus_operations lops_smbus_bus = { + .read_byte = lsmbus_read_byte, + .write_byte = lsmbus_write_byte, +}; + +static void pch_smbus_init(device_t dev) +{ + struct resource *res; + u16 reg16; + + /* Enable clock gating */ + reg16 = pci_read_config32(dev, 0x80); + reg16 &= ~((1 << 8)|(1 << 10)|(1 << 12)|(1 << 14)); + pci_write_config32(dev, 0x80, reg16); + + /* 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 smbus_read_resources(device_t dev) +{ + struct resource *res = new_resource(dev, PCI_BASE_ADDRESS_4); + res->base = SMBUS_IO_BASE; + res->size = 32; + res->limit = res->base + res->size - 1; + res->flags = IORESOURCE_IO | IORESOURCE_FIXED | IORESOURCE_RESERVE | + IORESOURCE_STORED | IORESOURCE_ASSIGNED; + + /* Also add MMIO resource */ + res = pci_get_resource(dev, PCI_BASE_ADDRESS_0); +} + +static struct device_operations smbus_ops = { + .read_resources = &smbus_read_resources, + .set_resources = &pci_dev_set_resources, + .enable_resources = &pci_dev_enable_resources, + .scan_bus = &scan_smbus, + .init = &pch_smbus_init, + .ops_smbus_bus = &lops_smbus_bus, +}; + +static const unsigned short pci_device_ids[] = { + PCI_DEVICE_ID_INTEL_SPT_LP_SMBUS, + PCI_DEVICE_ID_INTEL_SPT_H_SMBUS, + 0 +}; + +static const struct pci_driver pch_smbus __pci_driver = { + .ops = &smbus_ops, + .vendor = PCI_VENDOR_ID_INTEL, + .devices = pci_device_ids, +}; |