On Fri, 18 Nov 2016, Tan Jui Nee wrote:
> This driver uses the P2SB hide/unhide mechanism cooperatively
> to pass the PCI BAR address to the gpio platform driver.
>
> Signed-off-by: Tan Jui Nee <jui.nee.tan@xxxxxxxxx>
> Reviewed-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
> ---
> Changes in V11:
> - Remove duplicated object file lpc_ich-objs in Makefile.
> - Put p2sb.h header file in separate section in lpc_ich-apl.c, as asm stuff
> is platform specific (suggested by Andy).
> - Rearrange variable declarations in lpc_ich_add_gpio() function
> (suggested by Andy).
> - Move warn_continue label before if/else statement for the sake of
> readability (suggested by Andy).
> - Add comment to #endif in lpc_ich_apl.h file.
>
> Changes in V10:
> - No change
>
> Changes in V9:
> - No change
>
> Changes in V8:
> - Rename source file lpc_ich-apl.c to lpc_ich_apl.c (suggested by Mika).
>
> Changes in V7:
> - Add author information and rewrite description of source file
> lpc_ich-apl.c and lpc_ich_apl.h.
> - Sort the header files by alphabetical order in lpc_ich-apl.c.
> - Rename header file lpc_ich-apl.h to lpc_ich_apl.h (suggested by Lee).
> - Remove unneeded pdata_size and platform_data from mfd_cell.
> Also, remove unneeded apl_pinctrl_pdata.
> - Since variable apl_p2sb is only used once, hence switch it out for the
> PCI_DEVFN macro (suggested by Lee).
> - Define APL_GPIO_COMMUNITY_MAX as total Apollo Lake GPIO communities
> supported.
> - Set resources in mfd_cell for each GPIO community.
> - Call p2sb_bar() function once instead of four times inside the for loop.
> And make p2sb_bar() function just to fill in the base address into a
> scratch "struct resource" and have the loop do the additions to base/end.
> - Remove entire apl_pinctrl_pdata.name memory allocation since it is no
> longer needed.
> - Return ret at the end of lpc_ich_add_gpio() function.
>
> Changes in V6:
> - Rename CONFIG_X86_INTEL_APL to CONFIG_X86_INTEL_IVI so that it
> relates to the actual product, as suggested by Mika.
> - Rework Makefile according Andy's comments.
> - Rename lpc_ich_misc() to lpc_ich_add_gpio() so that the name should not
> be so generic, as suggested by Andy.
> - Call lpc_ich_add_gpio() via priv->chipset.
> - lpc_ich_add_gpio() function will be moved from
> .../include/linux/mfd/lpc_ich.h to
> .../drivers/mfd/lpc_ich-apl.h
> as this is a part of internal driver interface as suggested by Andy.
> - Move enum lpc_chipsets from
> .../drivers/mfd/lpc_ich-core.c to
> .../include/linux/mfd/lpc_ich.h
> as lpc_chipsets is also accessed by lpc_ich_add_gpio().
> - Check if kasprintf return value for all 4 gpio controllers before
> proceed to add platform device by using mfd_add_devices().
>
> Changes in V5:
> - Split lpc-ich driver into two parts (lpc_ich-core and lpc_ich-apl).
> The file lpc_ich-apl.c introduces gpio platform driver in MFD.
> - Rename Kconfig option CONFIG_X86_INTEL_NON_ACPI to CONFIG_X86_INTEL_APL
> so that it reflects actual product as suggested by Mika.
>
> Changes in V4:
> - Move Kconfig option CONFIG_X86_INTEL_NON_ACPI from
> [PATCH 2/3] x86/platform/p2sb: New Primary to Sideband bridge support driver for Intel SOC's
> to
> [PATCH 3/3] mfd: lpc_ich: Add support for Intel Apollo Lake GPIO pinctrl in non-ACPI system
> since the config is used in latter patch.
> - Select CONFIG_P2SB when CONFIG_LPC_ICH is enabled.
> - Remove #ifdef CONFIG_X86_INTEL_NON_ACPI and use
> #if defined(CONFIG_X86_INTEL_NON_ACPI) when lpc_ich_misc is called
> as suggested by Lee Jones.
> - Use single dimensional array instead of 2D array for apl_gpio_io_res
> structure and use DEFINE_RES_IRQ for its IRQ resource.
>
> Changes in V3:
> - Simplify register addresses calculation and use DEFINE_RES_MEM_NAMED
> defines for apl_gpio_io_res structure
> - Define magic number for P2SB PCI ID
> - Replace switch-case with if-else since currently we have only one
> use case
> - Only call mfd_add_devices() once for all gpio communities
>
> Changes in V2:
> - Add new config option CONFIG_X86_INTEL_NON_ACPI and "select PINCTRL"
> to fix kbuildbot error
>
> drivers/mfd/Makefile | 3 ++
> drivers/mfd/lpc_ich_apl.c | 121 +++++++++++++++++++++++++++++++++++++++++++++
> drivers/mfd/lpc_ich_apl.h | 28 +++++++++++
> drivers/mfd/lpc_ich_core.c | 5 ++
> 4 files changed, 157 insertions(+)
> create mode 100644 drivers/mfd/lpc_ich_apl.c
> create mode 100644 drivers/mfd/lpc_ich_apl.h
>
> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> index 06a91ea..b7fb703 100644
> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -161,6 +161,9 @@ obj-$(CONFIG_MFD_INTEL_QUARK_I2C_GPIO) += intel_quark_i2c_gpio.o
> obj-$(CONFIG_LPC_SCH) += lpc_sch.o
> lpc_ich-objs := lpc_ich_core.o
> obj-$(CONFIG_LPC_ICH) += lpc_ich.o
> +ifeq ($(CONFIG_X86_INTEL_IVI),y)
> +lpc_ich-objs += lpc_ich_apl.o
> +endif
What's with the iffery?
> obj-$(CONFIG_MFD_RDC321X) += rdc321x-southbridge.o
> obj-$(CONFIG_MFD_JANZ_CMODIO) += janz-cmodio.o
> obj-$(CONFIG_MFD_JZ4740_ADC) += jz4740-adc.o
> diff --git a/drivers/mfd/lpc_ich_apl.c b/drivers/mfd/lpc_ich_apl.c
> new file mode 100644
> index 0000000..aef3c13
> --- /dev/null
> +++ b/drivers/mfd/lpc_ich_apl.c
> @@ -0,0 +1,121 @@
> +/*
> + * Intel Apollo Lake In-Vehicle Infotainment (IVI) systems used in cars support
> + *
> + * Copyright (C) 2016 Intel Corporation
> + *
> + * Author: Tan, Jui Nee <jui.nee.tan@xxxxxxxxx>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#include <linux/mfd/core.h>
> +#include <linux/mfd/lpc_ich.h>
> +#include <linux/pci.h>
> +#include <linux/pinctrl/pinctrl.h>
> +
> +#include <asm/p2sb.h>
> +
> +#include "lpc_ich_apl.h"
> +
> +/* Offset data for Apollo Lake GPIO communities */
> +#define APL_GPIO_SOUTHWEST_OFFSET 0xc00000
> +#define APL_GPIO_NORTHWEST_OFFSET 0xc40000
> +#define APL_GPIO_NORTH_OFFSET 0xc50000
> +#define APL_GPIO_WEST_OFFSET 0xc70000
> +
> +#define APL_GPIO_SOUTHWEST_NPIN 43
> +#define APL_GPIO_NORTHWEST_NPIN 77
> +#define APL_GPIO_NORTH_NPIN 78
> +#define APL_GPIO_WEST_NPIN 47
> +
> +#define APL_GPIO_COMMUNITY_MAX 4
> +
> +#define APL_GPIO_IRQ 14
> +
> +#define PCI_IDSEL_P2SB 0x0d
Please tab all of these out, so they are in a single line. #OCD
> +static struct resource apl_gpio_io_res[] = {
> + DEFINE_RES_MEM_NAMED(APL_GPIO_NORTH_OFFSET,
> + APL_GPIO_NORTH_NPIN * SZ_8, "apl_pinctrl_n"),
> + DEFINE_RES_MEM_NAMED(APL_GPIO_NORTHWEST_OFFSET,
> + APL_GPIO_NORTHWEST_NPIN * SZ_8, "apl_pinctrl_nw"),
> + DEFINE_RES_MEM_NAMED(APL_GPIO_WEST_OFFSET,
> + APL_GPIO_WEST_NPIN * SZ_8, "apl_pinctrl_w"),
> + DEFINE_RES_MEM_NAMED(APL_GPIO_SOUTHWEST_OFFSET,
> + APL_GPIO_SOUTHWEST_NPIN * SZ_8, "apl_pinctrl_sw"),
> + DEFINE_RES_IRQ(APL_GPIO_IRQ),
> +};
> +
> +static struct mfd_cell apl_gpio_devices[] = {
> + {
> + .name = "apl-pinctrl",
> + .id = 0,
Are you using these IDs for anything specific?
> + .num_resources = ARRAY_SIZE(apl_gpio_io_res),
> + .resources = &apl_gpio_io_res[0],
> + .ignore_resource_conflicts = true,
> + },
> + {
> + .name = "apl-pinctrl",
> + .id = 1,
> + .num_resources = ARRAY_SIZE(apl_gpio_io_res),
> + .resources = &apl_gpio_io_res[1],
> + .ignore_resource_conflicts = true,
> + },
> + {
> + .name = "apl-pinctrl",
> + .id = 2,
> + .num_resources = ARRAY_SIZE(apl_gpio_io_res),
> + .resources = &apl_gpio_io_res[2],
> + .ignore_resource_conflicts = true,
> + },
> + {
> + .name = "apl-pinctrl",
> + .id = 3,
> + .num_resources = ARRAY_SIZE(apl_gpio_io_res),
> + .resources = &apl_gpio_io_res[3],
> + .ignore_resource_conflicts = true,
> + },
> +};
> +
> +int lpc_ich_add_gpio(struct pci_dev *dev, enum lpc_chipsets chipset)
Why does these need to be in its own file?
> +{
> + struct resource base;
> + unsigned int i;
> + int ret;
> +
> + if (chipset != LPC_APL)
> + return -ENODEV;
> + /*
> + * Apollo lake has 4 gpio controllers,
> + * handle it a bit differently.
> + */
> +
> + ret = p2sb_bar(dev, PCI_DEVFN(PCI_IDSEL_P2SB, 0), &base);
> + if (ret)
> + goto warn_continue;
> +
> + for (i = 0; i < APL_GPIO_COMMUNITY_MAX; i++) {
> + struct resource *res = &apl_gpio_io_res[i];
> +
> + /* Fill MEM resource */
> + res->start += base.start;
> + res->end += base.start;
> + res->flags = base.flags;
> +
> + res++;
> + }
> +
> + ret = mfd_add_devices(&dev->dev, 0,
> + apl_gpio_devices, ARRAY_SIZE(apl_gpio_devices),
> + NULL, 0, NULL);
> +
> +warn_continue:
> + if (ret)
> + dev_warn(&dev->dev,
> + "Failed to add Apollo Lake GPIO: %d\n",
> + ret);
Incorrect tabbing.
> + return ret;
> +}
> diff --git a/drivers/mfd/lpc_ich_apl.h b/drivers/mfd/lpc_ich_apl.h
> new file mode 100644
> index 0000000..6721621
> --- /dev/null
> +++ b/drivers/mfd/lpc_ich_apl.h
> @@ -0,0 +1,28 @@
> +/*
> + * Intel In-Vehicle Infotainment (IVI) systems used in cars support
> + *
> + * Copyright (C) 2016, Intel Corporation
> + *
> + * Author: Tan, Jui Nee <jui.nee.tan@xxxxxxxxx>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#ifndef __LPC_ICH_APL_H__
> +#define __LPC_ICH_APL_H__
> +
> +#include <linux/pci.h>
> +
> +#if IS_ENABLED(CONFIG_X86_INTEL_IVI)
> +int lpc_ich_add_gpio(struct pci_dev *dev, enum lpc_chipsets chipset);
> +#else /* CONFIG_X86_INTEL_IVI is not set */
> +static inline int lpc_ich_add_gpio(struct pci_dev *dev,
> + enum lpc_chipsets chipset)
> +{
> + return -ENODEV;
> +}
> +#endif /* CONFIG_X86_INTEL_IVI */
> +
> +#endif /* __LPC_ICH_APL_H__ */
> diff --git a/drivers/mfd/lpc_ich_core.c b/drivers/mfd/lpc_ich_core.c
> index 3bb6334..25c4d99 100644
> --- a/drivers/mfd/lpc_ich_core.c
> +++ b/drivers/mfd/lpc_ich_core.c
> @@ -68,6 +68,8 @@
> #include <linux/mfd/lpc_ich.h>
> #include <linux/platform_data/itco_wdt.h>
>
> +#include "lpc_ich_apl.h"
> +
> #define ACPIBASE 0x40
> #define ACPIBASE_GPE_OFF 0x28
> #define ACPIBASE_GPE_END 0x2f
> @@ -1030,6 +1032,9 @@ static int lpc_ich_probe(struct pci_dev *dev,
> cell_added = true;
> }
>
> + if (!lpc_ich_add_gpio(dev, priv->chipset))
This is a non-traditional way of checking for errors. Please use
'ret' instead.
Why isn't it an issue if this fails?
> + cell_added = true;
> +
> /*
> * We only care if at least one or none of the cells registered
> * successfully.
--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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