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Date: Thu, 23 Nov 2017 09:08:11 -0800
From: Guenter Roeck <linux@...ck-us.net>
To: Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
sathyanarayanan.kuppuswamy@...ux.intel.com
Cc: a.zummo@...ertech.it, x86@...nel.org, wim@...ana.be,
mingo@...hat.com, alexandre.belloni@...e-electrons.com,
qipeng.zha@...el.com, hpa@...or.com, dvhart@...radead.org,
tglx@...utronix.de, lee.jones@...aro.org, andy@...radead.org,
souvik.k.chakravarty@...el.com, linux-rtc@...r.kernel.org,
linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org,
platform-driver-x86@...r.kernel.org, sathyaosid@...il.com,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: Re: [RFC v8 2/7] platform/x86: intel_pmc_ipc: Use MFD framework to
create dependent devices
On 11/23/2017 03:49 AM, Heikki Krogerus wrote:
> Hi,
>
> On Sun, Oct 29, 2017 at 02:49:55AM -0700, sathyanarayanan.kuppuswamy@...ux.intel.com wrote:
>> From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>
>>
>> Currently, we have lot of repetitive code in dependent device resource
>> allocation and device creation handling code. This logic can be improved if
>> we use MFD framework for dependent device creation. This patch adds this
>> support.
>>
>> Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>
>> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
>> ---
>> drivers/platform/x86/intel_pmc_ipc.c | 398 ++++++++++++-----------------------
>> 1 file changed, 139 insertions(+), 259 deletions(-)
>>
>> Changes since v7:
>> * Fixed style issues.
>>
>> Changes since v6:
>> * Fixed style issues.
>> * Used Andy's modified version.
>>
>> Changes since v5:
>> * Changed the order of patches in this patchlist.
>>
>> Changes since v4:
>> * Changed the order of patches in this patchlist.
>>
>> Changes since v3:
>> * Changed PLATFORM_DEVID_AUTO to PLATFORM_DEVID_NONE in mfd device creation.
>> * Fixed error in resource initalization logic in ipc_create_punit_device.
>> * Removed mfd cell id initialization.
>>
>> diff --git a/drivers/platform/x86/intel_pmc_ipc.c b/drivers/platform/x86/intel_pmc_ipc.c
>> index e03fa314..e36144c 100644
>> --- a/drivers/platform/x86/intel_pmc_ipc.c
>> +++ b/drivers/platform/x86/intel_pmc_ipc.c
>> @@ -20,6 +20,7 @@
>> #include <linux/errno.h>
>> #include <linux/init.h>
>> #include <linux/device.h>
>> +#include <linux/mfd/core.h>
>> #include <linux/pm.h>
>> #include <linux/pci.h>
>> #include <linux/platform_device.h>
>> @@ -88,6 +89,7 @@
>> #define PLAT_RESOURCE_ISP_IFACE_INDEX 5
>> #define PLAT_RESOURCE_GTD_DATA_INDEX 6
>> #define PLAT_RESOURCE_GTD_IFACE_INDEX 7
>> +#define PLAT_RESOURCE_MEM_MAX_INDEX 8
>> #define PLAT_RESOURCE_ACPI_IO_INDEX 0
>>
>> /*
>> @@ -106,8 +108,6 @@
>> #define TELEM_SSRAM_SIZE 240
>> #define TELEM_PMC_SSRAM_OFFSET 0x1B00
>> #define TELEM_PUNIT_SSRAM_OFFSET 0x1A00
>> -#define TCO_PMC_OFFSET 0x8
>> -#define TCO_PMC_SIZE 0x4
>>
>> /* PMC register bit definitions */
>>
>> @@ -124,26 +124,10 @@ static struct intel_pmc_ipc_dev {
>> int cmd;
>> struct completion cmd_complete;
>>
>> - /* The following PMC BARs share the same ACPI device with the IPC */
>> - resource_size_t acpi_io_base;
>> - int acpi_io_size;
>> - struct platform_device *tco_dev;
>> -
>> /* gcr */
>> void __iomem *gcr_mem_base;
>> bool has_gcr_regs;
>> spinlock_t gcr_lock;
>> -
>> - /* punit */
>> - struct platform_device *punit_dev;
>> -
>> - /* Telemetry */
>> - resource_size_t telem_pmc_ssram_base;
>> - resource_size_t telem_punit_ssram_base;
>> - int telem_pmc_ssram_size;
>> - int telem_punit_ssram_size;
>> - u8 telem_res_inval;
>> - struct platform_device *telemetry_dev;
>> } ipcdev;
>>
>> static char *ipc_err_sources[] = {
>> @@ -508,7 +492,7 @@ static int ipc_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>> 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");
>> + dev_err(&pdev->dev, "Failed to request IRQ\n");
>> return ret;
>> }
>>
>> @@ -593,44 +577,6 @@ static const struct attribute_group intel_ipc_group = {
>> .attrs = intel_ipc_attrs,
>> };
>>
>> -static struct resource punit_res_array[] = {
>> - /* Punit BIOS */
>> - {
>> - .flags = IORESOURCE_MEM,
>> - },
>> - {
>> - .flags = IORESOURCE_MEM,
>> - },
>> - /* Punit ISP */
>> - {
>> - .flags = IORESOURCE_MEM,
>> - },
>> - {
>> - .flags = IORESOURCE_MEM,
>> - },
>> - /* Punit GTD */
>> - {
>> - .flags = IORESOURCE_MEM,
>> - },
>> - {
>> - .flags = IORESOURCE_MEM,
>> - },
>> -};
>> -
>> -#define TCO_RESOURCE_ACPI_IO 0
>> -#define TCO_RESOURCE_SMI_EN_IO 1
>> -#define TCO_RESOURCE_GCR_MEM 2
>> -static struct resource tco_res[] = {
>> - /* ACPI - TCO */
>> - {
>> - .flags = IORESOURCE_IO,
>> - },
>> - /* ACPI - SMI */
>> - {
>> - .flags = IORESOURCE_IO,
>> - },
>> -};
>> -
>> static struct itco_wdt_platform_data tco_info = {
>> .name = "Apollo Lake SoC",
>> .version = 5,
>> @@ -638,234 +584,177 @@ static struct itco_wdt_platform_data tco_info = {
>> .update_no_reboot_bit = update_no_reboot_bit,
>> };
>>
>> -#define TELEMETRY_RESOURCE_PUNIT_SSRAM 0
>> -#define TELEMETRY_RESOURCE_PMC_SSRAM 1
>> -static struct resource telemetry_res[] = {
>> - /*Telemetry*/
>> - {
>> - .flags = IORESOURCE_MEM,
>> - },
>> - {
>> - .flags = IORESOURCE_MEM,
>> - },
>> -};
>> -
>> -static int ipc_create_punit_device(void)
>> +static int ipc_create_punit_device(struct platform_device *pdev)
>> {
>> - struct platform_device *pdev;
>> - const struct platform_device_info pdevinfo = {
>> - .parent = ipcdev.dev,
>> - .name = PUNIT_DEVICE_NAME,
>> - .id = -1,
>> - .res = punit_res_array,
>> - .num_res = ARRAY_SIZE(punit_res_array),
>> + struct resource punit_res[PLAT_RESOURCE_MEM_MAX_INDEX];
>> + struct mfd_cell punit_cell;
>> + struct resource *res;
>
> That's where you have the bug I reported earlier. You would need to
> introduce those structures as static struct..
>
> But instead of fixing those, drop them and introduce the resources and
> the cells out side of these functions:
>
> static struct resource punit_resources[PLAT_RESOURCE_MEM_MAX_INDEX];
> static struct resource telemetry_resources[2];
> static struct resource wdt_resources[2];
>
> static struct mfd_cell pmc_cell[] = {
> {
> .name = "intel_punit_ipc",
> .resources = punit_resources,
> .num_resources = PLAT_RESOURCE_MEM_MAX_INDEX,
> .ignore_resource_conflicts = true,
> },
> {
> .name = "intel_telemetry",
> .resources = telemetry_resources,
> .num_resources = 2,
> .ignore_resource_conflicts = true,
> },
> {
> .name = "iTCO_wdt",
> .resources = wdt_resources,
> .num_resources = 2,
> .ignore_resource_conflicts = true,
> .platform_data = &tco_info,
> .pdata_size = sizeof(tco_info),
> },
> };
>
> Note that I'm not using the definitions for the name strings on
> purpose. Please get rid of those definitions while at it.
>
> Use these functions - ipc_create_punit/wdt/telemetry_device() - to just
> collect the resources. Then you call devm_mfd_add_devices() only ones
> in ipc_create_pmc_devices(). That should make this driver a bit more
> easier to read and understand.
>
>> + int mindex, pindex = 0;
>> +
>> + for (mindex = 0; mindex <= PLAT_RESOURCE_MEM_MAX_INDEX; mindex++) {
>> +
>> + res = platform_get_resource(pdev, IORESOURCE_MEM, mindex);
>> +
>> + switch (mindex) {
>> + /* Get PUNIT resources */
>> + case PLAT_RESOURCE_BIOS_DATA_INDEX:
>> + case PLAT_RESOURCE_BIOS_IFACE_INDEX:
>> + /* BIOS resources are required, so return error if not
>> + * available
>> + */
>> + if (!res) {
>> + dev_err(&pdev->dev,
>> + "Failed to get PUNIT MEM resource %d\n",
>> + pindex);
>> + return -ENXIO;
>> + }
>> + case PLAT_RESOURCE_ISP_DATA_INDEX:
>> + case PLAT_RESOURCE_ISP_IFACE_INDEX:
>> + case PLAT_RESOURCE_GTD_DATA_INDEX:
>> + case PLAT_RESOURCE_GTD_IFACE_INDEX:
>> + /* if valid resource found, copy the resource to PUNIT
>> + * resource
>> + */
>> + if (res)
>> + memcpy(&punit_res[pindex], res, sizeof(*res));
>> + punit_res[pindex].flags = IORESOURCE_MEM;
>> + dev_dbg(&pdev->dev, "PUNIT memory res: %pR\n",
>> + &punit_res[pindex]);
>
> I don't see how is that useful information?
>
>> + pindex++;
>> + break;
>> };
>> + }
>>
>> - pdev = platform_device_register_full(&pdevinfo);
>> - if (IS_ERR(pdev))
>> - return PTR_ERR(pdev);
>> -
>> - ipcdev.punit_dev = pdev;
>> + /* Create PUNIT IPC MFD cell */
>> + punit_cell.name = PUNIT_DEVICE_NAME;
>> + punit_cell.num_resources = ARRAY_SIZE(punit_res);
>> + punit_cell.resources = punit_res;
>> + punit_cell.ignore_resource_conflicts = 1;
>>
>> - return 0;
>> + return devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE,
>> + &punit_cell, 1, NULL, 0, NULL);
>> }
>>
>> -static int ipc_create_tco_device(void)
>> +static int ipc_create_wdt_device(struct platform_device *pdev)
>> {
>> - struct platform_device *pdev;
>> + static struct resource wdt_ipc_res[2];
>> struct resource *res;
>> - const struct platform_device_info pdevinfo = {
>> - .parent = ipcdev.dev,
>> - .name = TCO_DEVICE_NAME,
>> - .id = -1,
>> - .res = tco_res,
>> - .num_res = ARRAY_SIZE(tco_res),
>> - .data = &tco_info,
>> - .size_data = sizeof(tco_info),
>> - };
>> + static struct mfd_cell wdt_cell;
>>
>> - res = tco_res + TCO_RESOURCE_ACPI_IO;
>> - res->start = ipcdev.acpi_io_base + TCO_BASE_OFFSET;
>> - res->end = res->start + TCO_REGS_SIZE - 1;
>> + /* If we have ACPI based watchdog use that instead, othewise create
>> + * a MFD cell for iTCO watchdog
>> + */
>> + if (acpi_has_watchdog())
>> + return 0;
>>
>> - res = tco_res + TCO_RESOURCE_SMI_EN_IO;
>> - res->start = ipcdev.acpi_io_base + SMI_EN_OFFSET;
>> - res->end = res->start + SMI_EN_SIZE - 1;
>> + /* Get iTCO watchdog resources */
>> + res = platform_get_resource(pdev, IORESOURCE_IO,
>> + PLAT_RESOURCE_ACPI_IO_INDEX);
>> + if (!res) {
>> + dev_err(&pdev->dev, "Failed to get WDT resource\n");
>> + return -ENXIO;
>> + }
>>
>> - pdev = platform_device_register_full(&pdevinfo);
>> - if (IS_ERR(pdev))
>> - return PTR_ERR(pdev);
>> + wdt_ipc_res[0].start = res->start + TCO_BASE_OFFSET;
>> + wdt_ipc_res[0].end = res->start +
>> + TCO_BASE_OFFSET + TCO_REGS_SIZE - 1;
>> + wdt_ipc_res[0].flags = IORESOURCE_IO;
>> + wdt_ipc_res[1].start = res->start + SMI_EN_OFFSET;
>> + wdt_ipc_res[1].end = res->start +
>> + SMI_EN_OFFSET + SMI_EN_SIZE - 1;
>> + wdt_ipc_res[1].flags = IORESOURCE_IO;
>>
>> - ipcdev.tco_dev = pdev;
>> + dev_dbg(&pdev->dev, "watchdog res 0: %pR\n", &wdt_ipc_res[0]);
>> + dev_dbg(&pdev->dev, "watchdog res 1: %pR\n", &wdt_ipc_res[1]);
>
> That definitely is not useful information. Please drop all dev_dbg
> calls from these patches.
>
>> - return 0;
>> + wdt_cell.name = TCO_DEVICE_NAME;
>> + wdt_cell.platform_data = &tco_info;
>> + wdt_cell.pdata_size = sizeof(tco_info);
>> + wdt_cell.num_resources = ARRAY_SIZE(wdt_ipc_res);
>> + wdt_cell.resources = wdt_ipc_res;
>> + wdt_cell.ignore_resource_conflicts = 1;
>> +
>> + return devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE,
>> + &wdt_cell, 1, NULL, 0, NULL);
Whatever you do, don't tell the mfd maintainer that you are doing this.
You are not supposed to call mfd functions from outside the mfd directory.
Guenter
>> }
>>
>> -static int ipc_create_telemetry_device(void)
>> +static int ipc_create_telemetry_device(struct platform_device *pdev)
>> {
>> - struct platform_device *pdev;
>> + struct resource telemetry_ipc_res[2];
>> + struct mfd_cell telemetry_cell;
>
> This is also broken. I'm attaching a diff with the changes to this
> patch I used when I tested this on my Broxton board.
>
>
> Thanks,
>
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