From: Mika Westerberg <mika.westerberg@linux.intel.com>
Date: Thu, 16 Apr 2020 11:15:33 +0300
Subject: platform/x86: intel_scu_ipc: Split out SCU IPC functionality from the
SCU driver
Git-commit: 54b34aa0a7295c0fc82c72c15bf42c05ad720d5f
Patch-mainline: v5.8-rc1
References: jsc#SLE-13918
The SCU IPC functionality is usable outside of Intel MID devices. For
example modern Intel CPUs include the same thing but now it is called
PMC (Power Management Controller) instead of SCU. To make the IPC
available for those split the driver into core part (intel_scu_ipc.c)
and the SCU PCI driver part (intel_scu_pcidrv.c) which then calls the
former before it goes and creates rest of the SCU devices. The SCU IPC
will also register a new class that gets assigned to the device that is
created under the parent PCI device.
We also split the Kconfig symbols so that INTEL_SCU_IPC enables the SCU
IPC library and INTEL_SCU_PCI the SCU driver and convert the users
accordingly. While there remove default y from the INTEL_SCU_PCI symbol
as it is already selected by X86_INTEL_MID.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Acked-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
---
arch/x86/Kconfig | 2
arch/x86/include/asm/intel_scu_ipc.h | 18 +++
drivers/mfd/Kconfig | 2
drivers/platform/x86/Kconfig | 24 ++--
drivers/platform/x86/intel_scu_ipc.c | 178 +++++++++++++++++++++-----------
drivers/platform/x86/intel_scu_pcidrv.c | 55 +++++++++
6 files changed, 209 insertions(+), 70 deletions(-)
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -592,7 +592,7 @@ config X86_INTEL_MID
select I2C
select DW_APB_TIMER
select APB_TIMER
- select INTEL_SCU_IPC
+ select INTEL_SCU_PCI
select MFD_INTEL_MSIC
---help---
Select to build a kernel capable of supporting Intel MID (Mobile
--- a/arch/x86/include/asm/intel_scu_ipc.h
+++ b/arch/x86/include/asm/intel_scu_ipc.h
@@ -2,6 +2,7 @@
#ifndef _ASM_X86_INTEL_SCU_IPC_H_
#define _ASM_X86_INTEL_SCU_IPC_H_
+#include <linux/ioport.h>
#include <linux/notifier.h>
#define IPCMSG_INDIRECT_READ 0x02
@@ -19,6 +20,23 @@
#define IPC_CMD_VRTC_SETTIME 1 /* Set time */
#define IPC_CMD_VRTC_SETALARM 2 /* Set alarm */
+struct device;
+struct intel_scu_ipc_dev;
+
+/**
+ * struct intel_scu_ipc_data - Data used to configure SCU IPC
+ * @mem: Base address of SCU IPC MMIO registers
+ * @irq: The IRQ number used for SCU (optional)
+ */
+struct intel_scu_ipc_data {
+ struct resource mem;
+ int irq;
+};
+
+struct intel_scu_ipc_dev *
+intel_scu_ipc_register(struct device *parent,
+ const struct intel_scu_ipc_data *scu_data);
+
/* Read single register */
int intel_scu_ipc_ioread8(u16 addr, u8 *data);
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -622,7 +622,7 @@ config MFD_INTEL_LPSS_PCI
config MFD_INTEL_MSIC
bool "Intel MSIC"
- depends on INTEL_SCU_IPC
+ depends on INTEL_SCU
select MFD_CORE
help
Select this option to enable access to Intel MSIC (Avatele
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -983,17 +983,25 @@ config INTEL_VBTN
be called intel_vbtn.
config INTEL_SCU_IPC
- bool "Intel SCU IPC Support"
+ bool
+
+config INTEL_SCU
+ bool
+ select INTEL_SCU_IPC
+
+config INTEL_SCU_PCI
+ bool "Intel SCU PCI driver"
depends on X86_INTEL_MID
- default y
- ---help---
- IPC is used to bridge the communications between kernel and SCU on
- some embedded Intel x86 platforms. This is not needed for PC-type
- machines.
+ select INTEL_SCU
+ help
+ This driver is used to bridge the communications between kernel
+ and SCU on some embedded Intel x86 platforms. It also creates
+ devices that are connected to the SoC through the SCU. This is
+ not needed for PC-type machines.
config INTEL_SCU_IPC_UTIL
tristate "Intel SCU IPC utility driver"
- depends on INTEL_SCU_IPC
+ depends on INTEL_SCU
default y
---help---
The IPC Util driver provides an interface with the SCU enabling
@@ -1002,7 +1010,7 @@ config INTEL_SCU_IPC_UTIL
config INTEL_MID_POWER_BUTTON
tristate "power button driver for Intel MID platforms"
- depends on INTEL_SCU_IPC && INPUT
+ depends on INTEL_SCU && INPUT
help
This driver handles the power button on the Intel MID platforms.
--- a/drivers/platform/x86/intel_scu_ipc.c
+++ b/drivers/platform/x86/intel_scu_ipc.c
@@ -18,11 +18,10 @@
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/interrupt.h>
-#include <linux/pci.h>
-#include <linux/pm.h>
-#include <linux/sfi.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/slab.h>
-#include <asm/intel-mid.h>
#include <asm/intel_scu_ipc.h>
/* IPC defines the following message types */
@@ -55,14 +54,13 @@
#define IPC_IOC 0x100 /* IPC command register IOC bit */
struct intel_scu_ipc_dev {
- struct device *dev;
+ struct device dev;
+ struct resource mem;
+ int irq;
void __iomem *ipc_base;
struct completion cmd_complete;
- u8 irq_mode;
};
-static struct intel_scu_ipc_dev ipcdev; /* Only one for now */
-
#define IPC_STATUS 0x04
#define IPC_STATUS_IRQ BIT(2)
#define IPC_STATUS_ERR BIT(1)
@@ -78,8 +76,14 @@ static struct intel_scu_ipc_dev ipcdev;
/* Timeout in jiffies */
#define IPC_TIMEOUT (3 * HZ)
+static struct intel_scu_ipc_dev *ipcdev; /* Only one for now */
static DEFINE_MUTEX(ipclock); /* lock used to prevent multiple call to SCU */
+static struct class intel_scu_ipc_class = {
+ .name = "intel_scu_ipc",
+ .owner = THIS_MODULE,
+};
+
/*
* Send ipc command
* Command Register (Write Only):
@@ -143,7 +147,7 @@ static inline int busy_loop(struct intel
usleep_range(50, 100);
} while (time_before(jiffies, end));
- dev_err(scu->dev, "IPC timed out");
+ dev_err(&scu->dev, "IPC timed out");
return -ETIMEDOUT;
}
@@ -153,7 +157,7 @@ static inline int ipc_wait_for_interrupt
int status;
if (!wait_for_completion_timeout(&scu->cmd_complete, IPC_TIMEOUT)) {
- dev_err(scu->dev, "IPC timed out\n");
+ dev_err(&scu->dev, "IPC timed out\n");
return -ETIMEDOUT;
}
@@ -166,13 +170,13 @@ static inline int ipc_wait_for_interrupt
static int intel_scu_ipc_check_status(struct intel_scu_ipc_dev *scu)
{
- return scu->irq_mode ? ipc_wait_for_interrupt(scu) : busy_loop(scu);
+ return scu->irq > 0 ? ipc_wait_for_interrupt(scu) : busy_loop(scu);
}
/* Read/Write power control(PMIC in Langwell, MSIC in PenWell) registers */
static int pwr_reg_rdwr(u16 *addr, u8 *data, u32 count, u32 op, u32 id)
{
- struct intel_scu_ipc_dev *scu = &ipcdev;
+ struct intel_scu_ipc_dev *scu;
int nc;
u32 offset = 0;
int err;
@@ -182,11 +186,11 @@ static int pwr_reg_rdwr(u16 *addr, u8 *d
memset(cbuf, 0, sizeof(cbuf));
mutex_lock(&ipclock);
-
- if (scu->dev == NULL) {
+ if (!ipcdev) {
mutex_unlock(&ipclock);
return -ENODEV;
}
+ scu = ipcdev;
for (nc = 0; nc < count; nc++, offset += 2) {
cbuf[offset] = addr[nc];
@@ -326,14 +330,15 @@ EXPORT_SYMBOL(intel_scu_ipc_update_regis
*/
int intel_scu_ipc_simple_command(int cmd, int sub)
{
- struct intel_scu_ipc_dev *scu = &ipcdev;
+ struct intel_scu_ipc_dev *scu;
int err;
mutex_lock(&ipclock);
- if (scu->dev == NULL) {
+ if (!ipcdev) {
mutex_unlock(&ipclock);
return -ENODEV;
}
+ scu = ipcdev;
ipc_command(scu, sub << 12 | cmd);
err = intel_scu_ipc_check_status(scu);
mutex_unlock(&ipclock);
@@ -356,14 +361,15 @@ EXPORT_SYMBOL(intel_scu_ipc_simple_comma
int intel_scu_ipc_command(int cmd, int sub, u32 *in, int inlen,
u32 *out, int outlen)
{
- struct intel_scu_ipc_dev *scu = &ipcdev;
+ struct intel_scu_ipc_dev *scu;
int i, err;
mutex_lock(&ipclock);
- if (scu->dev == NULL) {
+ if (!ipcdev) {
mutex_unlock(&ipclock);
return -ENODEV;
}
+ scu = ipcdev;
for (i = 0; i < inlen; i++)
ipc_data_writel(scu, *in++, 4 * i);
@@ -399,61 +405,113 @@ static irqreturn_t ioc(int irq, void *de
return IRQ_HANDLED;
}
+static void intel_scu_ipc_release(struct device *dev)
+{
+ struct intel_scu_ipc_dev *scu;
+
+ scu = container_of(dev, struct intel_scu_ipc_dev, dev);
+ if (scu->irq > 0)
+ free_irq(scu->irq, scu);
+ iounmap(scu->ipc_base);
+ release_mem_region(scu->mem.start, resource_size(&scu->mem));
+ kfree(scu);
+}
+
/**
- * ipc_probe - probe an Intel SCU IPC
- * @pdev: the PCI device matching
- * @id: entry in the match table
- *
- * Enable and install an intel SCU IPC. This appears in the PCI space
- * but uses some hard coded addresses as well.
- */
-static int ipc_probe(struct pci_dev *pdev, const struct pci_device_id *id)
+ * intel_scu_ipc_register() - Register SCU IPC device
+ * @parent: Parent device
+ * @scu_data: Data used to configure SCU IPC
+ *
+ * Call this function to register SCU IPC mechanism under @parent.
+ * Returns pointer to the new SCU IPC device or ERR_PTR() in case of
+ * failure.
+ */
+struct intel_scu_ipc_dev *
+intel_scu_ipc_register(struct device *parent,
+ const struct intel_scu_ipc_data *scu_data)
{
int err;
- struct intel_scu_ipc_dev *scu = &ipcdev;
+ struct intel_scu_ipc_dev *scu;
+ void __iomem *ipc_base;
+
+ mutex_lock(&ipclock);
+ /* We support only one IPC */
+ if (ipcdev) {
+ err = -EBUSY;
+ goto err_unlock;
+ }
+
+ scu = kzalloc(sizeof(*scu), GFP_KERNEL);
+ if (!scu) {
+ err = -ENOMEM;
+ goto err_unlock;
+ }
- if (scu->dev) /* We support only one SCU */
- return -EBUSY;
+ scu->dev.parent = parent;
+ scu->dev.class = &intel_scu_ipc_class;
+ scu->dev.release = intel_scu_ipc_release;
+ dev_set_name(&scu->dev, "intel_scu_ipc");
+
+ if (!request_mem_region(scu_data->mem.start, resource_size(&scu_data->mem),
+ "intel_scu_ipc")) {
+ err = -EBUSY;
+ goto err_free;
+ }
- err = pcim_enable_device(pdev);
- if (err)
- return err;
-
- err = pcim_iomap_regions(pdev, 1 << 0, pci_name(pdev));
- if (err)
- return err;
+ ipc_base = ioremap(scu_data->mem.start, resource_size(&scu_data->mem));
+ if (!ipc_base) {
+ err = -ENOMEM;
+ goto err_release;
+ }
+ scu->ipc_base = ipc_base;
+ scu->mem = scu_data->mem;
+ scu->irq = scu_data->irq;
init_completion(&scu->cmd_complete);
- scu->ipc_base = pcim_iomap_table(pdev)[0];
+ if (scu->irq > 0) {
+ err = request_irq(scu->irq, ioc, 0, "intel_scu_ipc", scu);
+ if (err)
+ goto err_unmap;
+ }
- err = devm_request_irq(&pdev->dev, pdev->irq, ioc, 0, "intel_scu_ipc",
- scu);
- if (err)
- return err;
+ /*
+ * After this point intel_scu_ipc_release() takes care of
+ * releasing the SCU IPC resources once refcount drops to zero.
+ */
+ err = device_register(&scu->dev);
+ if (err) {
+ put_device(&scu->dev);
+ goto err_unlock;
+ }
/* Assign device at last */
- scu->dev = &pdev->dev;
+ ipcdev = scu;
+ mutex_unlock(&ipclock);
- intel_scu_devices_create();
+ return scu;
- pci_set_drvdata(pdev, scu);
- return 0;
+err_unmap:
+ iounmap(ipc_base);
+err_release:
+ release_mem_region(scu_data->mem.start, resource_size(&scu_data->mem));
+err_free:
+ kfree(scu);
+err_unlock:
+ mutex_unlock(&ipclock);
+
+ return ERR_PTR(err);
}
+EXPORT_SYMBOL_GPL(intel_scu_ipc_register);
-static const struct pci_device_id pci_ids[] = {
- { PCI_VDEVICE(INTEL, 0x080e) },
- { PCI_VDEVICE(INTEL, 0x08ea) },
- { PCI_VDEVICE(INTEL, 0x11a0) },
- {}
-};
+static int __init intel_scu_ipc_init(void)
+{
+ return class_register(&intel_scu_ipc_class);
+}
+subsys_initcall(intel_scu_ipc_init);
-static struct pci_driver ipc_driver = {
- .driver = {
- .suppress_bind_attrs = true,
- },
- .name = "intel_scu_ipc",
- .id_table = pci_ids,
- .probe = ipc_probe,
-};
-builtin_pci_driver(ipc_driver);
+static void __exit intel_scu_ipc_exit(void)
+{
+ class_unregister(&intel_scu_ipc_class);
+}
+module_exit(intel_scu_ipc_exit);
--- /dev/null
+++ b/drivers/platform/x86/intel_scu_pcidrv.c
@@ -0,0 +1,55 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * PCI driver for the Intel SCU.
+ *
+ * Copyright (C) 2008-2010, 2015, 2020 Intel Corporation
+ * Authors: Sreedhara DS (sreedhara.ds@intel.com)
+ * Mika Westerberg <mika.westerberg@linux.intel.com>
+ */
+
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/pci.h>
+
+#include <asm/intel-mid.h>
+#include <asm/intel_scu_ipc.h>
+
+static int intel_scu_pci_probe(struct pci_dev *pdev,
+ const struct pci_device_id *id)
+{
+ struct intel_scu_ipc_data scu_data = {};
+ struct intel_scu_ipc_dev *scu;
+ int ret;
+
+ ret = pcim_enable_device(pdev);
+ if (ret)
+ return ret;
+
+ scu_data.mem = pdev->resource[0];
+ scu_data.irq = pdev->irq;
+
+ scu = intel_scu_ipc_register(&pdev->dev, &scu_data);
+ if (IS_ERR(scu))
+ return PTR_ERR(scu);
+
+ intel_scu_devices_create();
+ return 0;
+}
+
+static const struct pci_device_id pci_ids[] = {
+ { PCI_VDEVICE(INTEL, 0x080e) },
+ { PCI_VDEVICE(INTEL, 0x08ea) },
+ { PCI_VDEVICE(INTEL, 0x11a0) },
+ {}
+};
+
+static struct pci_driver intel_scu_pci_driver = {
+ .driver = {
+ .suppress_bind_attrs = true,
+ },
+ .name = "intel_scu",
+ .id_table = pci_ids,
+ .probe = intel_scu_pci_probe,
+};
+
+builtin_pci_driver(intel_scu_pci_driver);