[PATCH v2 25/36] platform/x86: intel_pmc_ipc: Start using SCU IPC

From: Mika Westerberg
Date: Wed Jan 08 2020 - 06:43:06 EST

SCU IPC is pretty much the same IPC implemented in the intel_pmc_ipc
driver so drop the duplicate implementation and call directly the SCU
IPC.

Signed-off-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
---
drivers/platform/x86/Kconfig | 1 +
drivers/platform/x86/intel_pmc_ipc.c | 299 +++++----------------------
2 files changed, 48 insertions(+), 252 deletions(-)

diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index e9ba81fc1770..797683c5d005 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -1193,6 +1193,7 @@ config INTEL_SMARTCONNECT
config INTEL_PMC_IPC
tristate "Intel PMC IPC Driver"
depends on ACPI && PCI
+ select INTEL_SCU_IPC
---help---
This driver provides support for PMC control on some Intel platforms.
The PMC is an ARC processor which defines IPC commands for communication
diff --git a/drivers/platform/x86/intel_pmc_ipc.c b/drivers/platform/x86/intel_pmc_ipc.c
index 8527327d88c7..10505fbd01b5 100644
--- a/drivers/platform/x86/intel_pmc_ipc.c
+++ b/drivers/platform/x86/intel_pmc_ipc.c
@@ -21,28 +21,10 @@
#include <linux/platform_device.h>

#include <asm/intel_pmc_ipc.h>
+#include <asm/intel_scu_ipc.h>

#include <linux/platform_data/itco_wdt.h>

-/*
- * IPC registers
- * The IA write to IPC_CMD command register triggers an interrupt to the ARC,
- * The ARC handles the interrupt and services it, writing optional data to
- * the IPC1 registers, updates the IPC_STS response register with the status.
- */
-#define IPC_CMD 0x00
-#define IPC_CMD_MSI BIT(8)
-#define IPC_CMD_SIZE 16
-#define IPC_CMD_SUBCMD 12
-#define IPC_STATUS 0x04
-#define IPC_STATUS_IRQ BIT(2)
-#define IPC_STATUS_ERR BIT(1)
-#define IPC_STATUS_BUSY BIT(0)
-#define IPC_SPTR 0x08
-#define IPC_DPTR 0x0C
-#define IPC_WRITE_BUFFER 0x80
-#define IPC_READ_BUFFER 0x90
-
/* Residency with clock rate at 19.2MHz to usecs */
#define S0IX_RESIDENCY_IN_USECS(d, s) \
({ \
@@ -51,16 +33,6 @@
result; \
})

-/*
- * 16-byte buffer for sending data associated with IPC command.
- */
-#define IPC_DATA_BUFFER_SIZE 16
-
-#define IPC_LOOP_CNT 3000000
-#define IPC_MAX_SEC 3
-
-#define IPC_TRIGGER_MODE_IRQ true
-
/* exported resources from IFWI */
#define PLAT_RESOURCE_IPC_INDEX 0
#define PLAT_RESOURCE_IPC_SIZE 0x1000
@@ -103,11 +75,6 @@

static struct intel_pmc_ipc_dev {
struct device *dev;
- void __iomem *ipc_base;
- bool irq_mode;
- int irq;
- int cmd;
- struct completion cmd_complete;

/* The following PMC BARs share the same ACPI device with the IPC */
resource_size_t acpi_io_base;
@@ -132,53 +99,6 @@ static struct intel_pmc_ipc_dev {
struct platform_device *telemetry_dev;
} ipcdev;

-static char *ipc_err_sources[] = {
- [IPC_ERR_NONE] =
- "no error",
- [IPC_ERR_CMD_NOT_SUPPORTED] =
- "command not supported",
- [IPC_ERR_CMD_NOT_SERVICED] =
- "command not serviced",
- [IPC_ERR_UNABLE_TO_SERVICE] =
- "unable to service",
- [IPC_ERR_CMD_INVALID] =
- "command invalid",
- [IPC_ERR_CMD_FAILED] =
- "command failed",
- [IPC_ERR_EMSECURITY] =
- "Invalid Battery",
- [IPC_ERR_UNSIGNEDKERNEL] =
- "Unsigned kernel",
-};
-
-/* Prevent concurrent calls to the PMC */
-static DEFINE_MUTEX(ipclock);
-
-static inline void ipc_send_command(u32 cmd)
-{
- ipcdev.cmd = cmd;
- if (ipcdev.irq_mode) {
- reinit_completion(&ipcdev.cmd_complete);
- cmd |= IPC_CMD_MSI;
- }
- writel(cmd, ipcdev.ipc_base + IPC_CMD);
-}
-
-static inline u32 ipc_read_status(void)
-{
- return readl(ipcdev.ipc_base + IPC_STATUS);
-}
-
-static inline void ipc_data_writel(u32 data, u32 offset)
-{
- writel(data, ipcdev.ipc_base + IPC_WRITE_BUFFER + offset);
-}
-
-static inline u32 ipc_data_readl(u32 offset)
-{
- return readl(ipcdev.ipc_base + IPC_READ_BUFFER + offset);
-}
-
static inline u64 gcr_data_readq(u32 offset)
{
return readq(ipcdev.gcr_mem_base + offset);
@@ -274,127 +194,6 @@ static int update_no_reboot_bit(void *priv, bool set)
PMC_CFG_NO_REBOOT_MASK, value);
}

-static int intel_pmc_ipc_check_status(void)
-{
- int status;
- int ret = 0;
-
- if (ipcdev.irq_mode) {
- if (0 == wait_for_completion_timeout(
- &ipcdev.cmd_complete, IPC_MAX_SEC * HZ))
- ret = -ETIMEDOUT;
- } else {
- int loop_count = IPC_LOOP_CNT;
-
- while ((ipc_read_status() & IPC_STATUS_BUSY) && --loop_count)
- udelay(1);
- if (loop_count == 0)
- ret = -ETIMEDOUT;
- }
-
- status = ipc_read_status();
- if (ret == -ETIMEDOUT) {
- dev_err(ipcdev.dev,
- "IPC timed out, TS=0x%x, CMD=0x%x\n",
- status, ipcdev.cmd);
- return ret;
- }
-
- if (status & IPC_STATUS_ERR) {
- int i;
-
- ret = -EIO;
- i = (status >> IPC_CMD_SIZE) & 0xFF;
- if (i < ARRAY_SIZE(ipc_err_sources))
- dev_err(ipcdev.dev,
- "IPC failed: %s, STS=0x%x, CMD=0x%x\n",
- ipc_err_sources[i], status, ipcdev.cmd);
- else
- dev_err(ipcdev.dev,
- "IPC failed: unknown, STS=0x%x, CMD=0x%x\n",
- status, ipcdev.cmd);
- if ((i == IPC_ERR_UNSIGNEDKERNEL) || (i == IPC_ERR_EMSECURITY))
- ret = -EACCES;
- }
-
- return ret;
-}
-
-/**
- * intel_pmc_ipc_simple_command() - Simple IPC command
- * @cmd: IPC command code.
- * @sub: IPC command sub type.
- *
- * Send a simple IPC command to PMC when don't need to specify
- * input/output data and source/dest pointers.
- *
- * Return: an IPC error code or 0 on success.
- */
-static int intel_pmc_ipc_simple_command(int cmd, int sub)
-{
- int ret;
-
- mutex_lock(&ipclock);
- if (ipcdev.dev == NULL) {
- mutex_unlock(&ipclock);
- return -ENODEV;
- }
- ipc_send_command(sub << IPC_CMD_SUBCMD | cmd);
- ret = intel_pmc_ipc_check_status();
- mutex_unlock(&ipclock);
-
- return ret;
-}
-
-/**
- * intel_pmc_ipc_raw_cmd() - IPC command with data and pointers
- * @cmd: IPC command code.
- * @sub: IPC command sub type.
- * @in: input data of this IPC command.
- * @inlen: input data length in bytes.
- * @out: output data of this IPC command.
- * @outlen: output data length in dwords.
- * @sptr: data writing to SPTR register.
- * @dptr: data writing to DPTR register.
- *
- * Send an IPC command to PMC with input/output data and source/dest pointers.
- *
- * Return: an IPC error code or 0 on success.
- */
-static int intel_pmc_ipc_raw_cmd(u32 cmd, u32 sub, u8 *in, u32 inlen, u32 *out,
- u32 outlen, u32 dptr, u32 sptr)
-{
- u32 wbuf[4] = { 0 };
- int ret;
- int i;
-
- if (inlen > IPC_DATA_BUFFER_SIZE || outlen > IPC_DATA_BUFFER_SIZE / 4)
- return -EINVAL;
-
- mutex_lock(&ipclock);
- if (ipcdev.dev == NULL) {
- mutex_unlock(&ipclock);
- return -ENODEV;
- }
- memcpy(wbuf, in, inlen);
- writel(dptr, ipcdev.ipc_base + IPC_DPTR);
- writel(sptr, ipcdev.ipc_base + IPC_SPTR);
- /* The input data register is 32bit register and inlen is in Byte */
- for (i = 0; i < ((inlen + 3) / 4); i++)
- ipc_data_writel(wbuf[i], 4 * i);
- ipc_send_command((inlen << IPC_CMD_SIZE) |
- (sub << IPC_CMD_SUBCMD) | cmd);
- ret = intel_pmc_ipc_check_status();
- if (!ret) {
- /* out is read from 32bit register and outlen is in 32bit */
- for (i = 0; i < outlen; i++)
- *out++ = ipc_data_readl(4 * i);
- }
- mutex_unlock(&ipclock);
-
- return ret;
-}
-
/**
* intel_pmc_ipc_command() - IPC command with input/output data
* @cmd: IPC command code.
@@ -411,34 +210,23 @@ static int intel_pmc_ipc_raw_cmd(u32 cmd, u32 sub, u8 *in, u32 inlen, u32 *out,
int intel_pmc_ipc_command(u32 cmd, u32 sub, u8 *in, u32 inlen,
u32 *out, u32 outlen)
{
- return intel_pmc_ipc_raw_cmd(cmd, sub, in, inlen, out, outlen, 0, 0);
+ return intel_scu_ipc_dev_command(NULL, cmd, sub, in, inlen, out,
+ outlen);
}
EXPORT_SYMBOL_GPL(intel_pmc_ipc_command);

-static irqreturn_t ioc(int irq, void *dev_id)
-{
- int status;
-
- if (ipcdev.irq_mode) {
- status = ipc_read_status();
- writel(status | IPC_STATUS_IRQ, ipcdev.ipc_base + IPC_STATUS);
- }
- complete(&ipcdev.cmd_complete);
-
- return IRQ_HANDLED;
-}
-
static int ipc_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
struct intel_pmc_ipc_dev *pmc = &ipcdev;
+ struct intel_scu_ipc_pdata pdata;
+ struct intel_scu_ipc_dev *scu;
int ret;

/* Only one PMC is supported */
if (pmc->dev)
return -EBUSY;

- pmc->irq_mode = IPC_TRIGGER_MODE_IRQ;
-
+ memset(&pdata, 0, sizeof(pdata));
spin_lock_init(&ipcdev.gcr_lock);

ret = pcim_enable_device(pdev);
@@ -449,24 +237,25 @@ static int ipc_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
if (ret)
return ret;

- init_completion(&pmc->cmd_complete);
-
- pmc->ipc_base = pcim_iomap_table(pdev)[0];
+ pdata.ipc_regs = pcim_iomap_table(pdev)[0];

- ret = devm_request_irq(&pdev->dev, pdev->irq, ioc, 0, "intel_pmc_ipc",
- pmc);
- if (ret) {
- dev_err(&pdev->dev, "Failed to request irq\n");
- return ret;
- }
+ scu = intel_scu_ipc_probe(&pdev->dev, &pdata);
+ if (IS_ERR(scu))
+ return PTR_ERR(scu);

pmc->dev = &pdev->dev;

- pci_set_drvdata(pdev, pmc);
+ pci_set_drvdata(pdev, scu);

return 0;
}

+static void ipc_pci_remove(struct pci_dev *pdev)
+{
+ intel_scu_ipc_remove(pci_get_drvdata(pdev));
+ ipcdev.dev = NULL;
+}
+
static const struct pci_device_id ipc_pci_ids[] = {
{PCI_VDEVICE(INTEL, 0x0a94), 0},
{PCI_VDEVICE(INTEL, 0x1a94), 0},
@@ -479,12 +268,14 @@ static struct pci_driver ipc_pci_driver = {
.name = "intel_pmc_ipc",
.id_table = ipc_pci_ids,
.probe = ipc_pci_probe,
+ .remove = ipc_pci_remove,
};

static ssize_t intel_pmc_ipc_simple_cmd_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
+ struct intel_scu_ipc_dev *scu = dev_get_drvdata(dev);
int subcmd;
int cmd;
int ret;
@@ -495,7 +286,7 @@ static ssize_t intel_pmc_ipc_simple_cmd_store(struct device *dev,
return -EINVAL;
}

- ret = intel_pmc_ipc_simple_command(cmd, subcmd);
+ ret = intel_scu_ipc_dev_simple_command(scu, cmd, subcmd);
if (ret) {
dev_err(dev, "command %d error with %d\n", cmd, ret);
return ret;
@@ -507,6 +298,7 @@ static ssize_t intel_pmc_ipc_northpeak_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
+ struct intel_scu_ipc_dev *scu = dev_get_drvdata(dev);
unsigned long val;
int subcmd;
int ret;
@@ -518,7 +310,8 @@ static ssize_t intel_pmc_ipc_northpeak_store(struct device *dev,
subcmd = 1;
else
subcmd = 0;
- ret = intel_pmc_ipc_simple_command(PMC_IPC_NORTHPEAK_CTRL, subcmd);
+ ret = intel_scu_ipc_dev_simple_command(scu, PMC_IPC_NORTHPEAK_CTRL,
+ subcmd);
if (ret) {
dev_err(dev, "command north %d error with %d\n", subcmd, ret);
return ret;
@@ -711,7 +504,8 @@ static int ipc_create_pmc_devices(void)
return ret;
}

-static int ipc_plat_get_res(struct platform_device *pdev)
+static int ipc_plat_get_res(struct platform_device *pdev,
+ struct intel_scu_ipc_pdata *pdata)
{
struct resource *res, *punit_res = punit_res_array;
void __iomem *addr;
@@ -795,7 +589,7 @@ static int ipc_plat_get_res(struct platform_device *pdev)
if (IS_ERR(addr))
return PTR_ERR(addr);

- ipcdev.ipc_base = addr;
+ pdata->ipc_regs = addr;

ipcdev.gcr_mem_base = addr + PLAT_RESOURCE_GCR_OFFSET;
dev_info(&pdev->dev, "ipc res: %pR\n", res);
@@ -851,49 +645,50 @@ MODULE_DEVICE_TABLE(acpi, ipc_acpi_ids);

static int ipc_plat_probe(struct platform_device *pdev)
{
+ struct intel_scu_ipc_pdata pdata;
+ struct intel_scu_ipc_dev *scu;
int ret;

+ memset(&pdata, 0, sizeof(pdata));
+ pdata.irq = platform_get_irq(pdev, 0);
+ if (pdata.irq < 0)
+ return -EINVAL;
+
ipcdev.dev = &pdev->dev;
- ipcdev.irq_mode = IPC_TRIGGER_MODE_IRQ;
- init_completion(&ipcdev.cmd_complete);
spin_lock_init(&ipcdev.gcr_lock);

- ipcdev.irq = platform_get_irq(pdev, 0);
- if (ipcdev.irq < 0)
- return -EINVAL;
-
- ret = ipc_plat_get_res(pdev);
+ ret = ipc_plat_get_res(pdev, &pdata);
if (ret) {
dev_err(&pdev->dev, "Failed to request resource\n");
return ret;
}

+ scu = intel_scu_ipc_probe(&pdev->dev, &pdata);
+ if (IS_ERR(scu))
+ return PTR_ERR(scu);
+
+ platform_set_drvdata(pdev, scu);
+
ret = ipc_create_pmc_devices();
if (ret) {
dev_err(&pdev->dev, "Failed to create pmc devices\n");
- return ret;
- }
-
- if (devm_request_irq(&pdev->dev, ipcdev.irq, ioc, IRQF_NO_SUSPEND,
- "intel_pmc_ipc", &ipcdev)) {
- dev_err(&pdev->dev, "Failed to request irq\n");
- ret = -EBUSY;
- goto err_irq;
+ goto err_ipc;
}

ret = sysfs_create_group(&pdev->dev.kobj, &intel_ipc_group);
if (ret) {
dev_err(&pdev->dev, "Failed to create sysfs group %d\n",
ret);
- goto err_sys;
+ goto err_devs;
}

ipcdev.has_gcr_regs = true;

return 0;
-err_sys:
- devm_free_irq(&pdev->dev, ipcdev.irq, &ipcdev);
-err_irq:
+
+err_ipc:
+ intel_scu_ipc_remove(scu);
+err_devs:
platform_device_unregister(ipcdev.tco_dev);
platform_device_unregister(ipcdev.punit_dev);
platform_device_unregister(ipcdev.telemetry_dev);
@@ -904,10 +699,10 @@ static int ipc_plat_probe(struct platform_device *pdev)
static int ipc_plat_remove(struct platform_device *pdev)
{
sysfs_remove_group(&pdev->dev.kobj, &intel_ipc_group);
- devm_free_irq(&pdev->dev, ipcdev.irq, &ipcdev);
platform_device_unregister(ipcdev.tco_dev);
platform_device_unregister(ipcdev.punit_dev);
platform_device_unregister(ipcdev.telemetry_dev);
+ intel_scu_ipc_remove(platform_get_drvdata(pdev));
ipcdev.dev = NULL;
return 0;
}
--
2.24.1