[tip:x86/platform] x86/platform: New Intel Atom SOC power management controller driver

From: tip-bot for Li, Aubrey
Date: Fri Jul 25 2014 - 17:31:53 EST

Commit-ID: 93e5eadd1f6e7f45c31aa327c42ac52e4df5ff6f
Gitweb: http://git.kernel.org/tip/93e5eadd1f6e7f45c31aa327c42ac52e4df5ff6f
Author: Li, Aubrey <aubrey.li@xxxxxxxxxxxxxxx>
AuthorDate: Mon, 30 Jun 2014 14:08:42 +0800
Committer: H. Peter Anvin <hpa@xxxxxxxxxxxxxxx>
CommitDate: Fri, 25 Jul 2014 14:11:29 -0700

x86/platform: New Intel Atom SOC power management controller driver

The Power Management Controller (PMC) controls many of the power
management features present in the Atom SoC. This driver provides
a native power off function via PMC PCI IO port.

On some ACPI hardware-reduced platforms(e.g. ASUS-T100), ACPI sleep
registers are not valid so that (*pm_power_off)() is not hooked by
acpi_power_off(). The power off function in this driver is installed
only when pm_power_off is NULL.

Signed-off-by: Aubrey Li <aubrey.li@xxxxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/53B0FEEA.3010805@xxxxxxxxxxxxxxx
Signed-off-by: Lejun Zhu <lejun.zhu@xxxxxxxxxxxxxxx>
Signed-off-by: H. Peter Anvin <hpa@xxxxxxxxxxxxxxx>
---
arch/x86/Kconfig | 4 ++
arch/x86/include/asm/pmc_atom.h | 31 ++++++++++++
arch/x86/kernel/Makefile | 1 +
arch/x86/kernel/pmc_atom.c | 104 ++++++++++++++++++++++++++++++++++++++++
4 files changed, 140 insertions(+)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index a8f749e..6295a21 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -2403,6 +2403,10 @@ config IOSF_MBI
default m
depends on PCI

+config PMC_ATOM
+ def_bool y
+ depends on PCI
+
source "net/Kconfig"

source "drivers/Kconfig"
diff --git a/arch/x86/include/asm/pmc_atom.h b/arch/x86/include/asm/pmc_atom.h
new file mode 100644
index 0000000..03a2769
--- /dev/null
+++ b/arch/x86/include/asm/pmc_atom.h
@@ -0,0 +1,31 @@
+/*
+ * Intel Atom SOC Power Management Controller Header File
+ * Copyright (c) 2014, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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 PMC_ATOM_H
+#define PMC_ATOM_H
+
+/* ValleyView Power Control Unit PCI Device ID */
+#define PCI_DEVICE_ID_VLV_PMC 0x0F1C
+
+/* PMC I/O Registers */
+#define ACPI_BASE_ADDR_OFFSET 0x40
+#define ACPI_BASE_ADDR_MASK 0xFFFFFE00
+#define ACPI_MMIO_REG_LEN 0x100
+
+#define PM1_CNT 0x4
+#define SLEEP_TYPE_MASK 0xFFFFECFF
+#define SLEEP_TYPE_S5 0x1C00
+#define SLEEP_ENABLE 0x2000
+#endif /* PMC_ATOM_H */
diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index 047f9ff..bde3993 100644
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -106,6 +106,7 @@ obj-$(CONFIG_EFI) += sysfb_efi.o
obj-$(CONFIG_PERF_EVENTS) += perf_regs.o
obj-$(CONFIG_TRACING) += tracepoint.o
obj-$(CONFIG_IOSF_MBI) += iosf_mbi.o
+obj-$(CONFIG_PMC_ATOM) += pmc_atom.o

###
# 64 bit specific files
diff --git a/arch/x86/kernel/pmc_atom.c b/arch/x86/kernel/pmc_atom.c
new file mode 100644
index 0000000..9eb79f6
--- /dev/null
+++ b/arch/x86/kernel/pmc_atom.c
@@ -0,0 +1,104 @@
+/*
+ * Intel Atom SOC Power Management Controller Driver
+ * Copyright (c) 2014, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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.
+ *
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/pci.h>
+#include <linux/device.h>
+#include <linux/io.h>
+
+#include <asm/pmc_atom.h>
+
+static u32 acpi_base_addr;
+
+static void pmc_power_off(void)
+{
+ u16 pm1_cnt_port;
+ u32 pm1_cnt_value;
+
+ pr_info("Preparing to enter system sleep state S5\n");
+
+ pm1_cnt_port = acpi_base_addr + PM1_CNT;
+
+ pm1_cnt_value = inl(pm1_cnt_port);
+ pm1_cnt_value &= SLEEP_TYPE_MASK;
+ pm1_cnt_value |= SLEEP_TYPE_S5;
+ pm1_cnt_value |= SLEEP_ENABLE;
+
+ outl(pm1_cnt_value, pm1_cnt_port);
+}
+
+static int pmc_setup_dev(struct pci_dev *pdev)
+{
+ /* Obtain ACPI base address */
+ pci_read_config_dword(pdev, ACPI_BASE_ADDR_OFFSET, &acpi_base_addr);
+ acpi_base_addr &= ACPI_BASE_ADDR_MASK;
+
+ /* Install power off function */
+ if (acpi_base_addr != 0 && pm_power_off == NULL)
+ pm_power_off = pmc_power_off;
+
+ return 0;
+}
+
+/*
+ * Data for PCI driver interface
+ *
+ * This data only exists for exporting the supported
+ * PCI ids via MODULE_DEVICE_TABLE. We do not actually
+ * register a pci_driver, because lpc_ich will register
+ * a driver on the same PCI id.
+ */
+static const struct pci_device_id pmc_pci_ids[] = {
+ { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_VLV_PMC) },
+ { 0, },
+};
+
+MODULE_DEVICE_TABLE(pci, pmc_pci_ids);
+
+static int __init pmc_atom_init(void)
+{
+ int err = -ENODEV;
+ struct pci_dev *pdev = NULL;
+ const struct pci_device_id *ent;
+
+ /* We look for our device - PCU PMC
+ * we assume that there is max. one device.
+ *
+ * We can't use plain pci_driver mechanism,
+ * as the device is really a multiple function device,
+ * main driver that binds to the pci_device is lpc_ich
+ * and have to find & bind to the device this way.
+ */
+ for_each_pci_dev(pdev) {
+ ent = pci_match_id(pmc_pci_ids, pdev);
+ if (ent) {
+ err = pmc_setup_dev(pdev);
+ goto out;
+ }
+ }
+ /* Device not found. */
+out:
+ return err;
+}
+
+module_init(pmc_atom_init);
+/* no module_exit, this driver shouldn't be unloaded */
+
+MODULE_AUTHOR("Aubrey Li <aubrey.li@xxxxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("Intel Atom SOC Power Management Controller Interface");
+MODULE_LICENSE("GPL v2");
--
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