Re: [PATCH v1 6/7] mfd: lpc_ich: Add support for pinctrl in non-ACPI system

Henning Schild
2021-04-12T16:01:28Z

Am Mon, 8 Mar 2021 14:20:19 +0200
schrieb Andy Shevchenko <andriy.shevchenko@linux.intel.com>:

> From: Tan Jui Nee <jui.nee.tan@intel.com>
>
> Add support for non-ACPI systems, such as system that uses
> Advanced Boot Loader (ABL) whereby a platform device has to be created
> in order to bind with pin control and GPIO.
>
> At the moment, Intel Apollo Lake In-Vehicle Infotainment (IVI) system
> requires a driver to hide and unhide P2SB to lookup P2SB BAR and pass
> the PCI BAR address to GPIO.
>
> Signed-off-by: Tan Jui Nee <jui.nee.tan@intel.com>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> ---
> drivers/mfd/lpc_ich.c | 100
> +++++++++++++++++++++++++++++++++++++++++- 1 file changed, 99
> insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mfd/lpc_ich.c b/drivers/mfd/lpc_ich.c
> index 8e9bd6813287..959247b6987a 100644
> --- a/drivers/mfd/lpc_ich.c
> +++ b/drivers/mfd/lpc_ich.c
> @@ -8,7 +8,8 @@
> * Configuration Registers.
> *
> * This driver is derived from lpc_sch.
> -
> + *
> + * Copyright (C) 2017, 2021 Intel Corporation
> * Copyright (c) 2011 Extreme Engineering Solution, Inc.
> * Author: Aaron Sierra <asierra@xes-inc.com>
> *
> @@ -43,6 +44,7 @@
> #include <linux/acpi.h>
> #include <linux/pci.h>
> #include <linux/pci-p2sb.h>
> +#include <linux/pinctrl/pinctrl.h>
> #include <linux/mfd/core.h>
> #include <linux/mfd/lpc_ich.h>
> #include <linux/platform_data/itco_wdt.h>
> @@ -140,6 +142,73 @@ static struct mfd_cell lpc_ich_gpio_cell = {
> .ignore_resource_conflicts = true,
> };
>
> +/* Offset data for Apollo Lake GPIO controllers */
> +#define APL_GPIO_SOUTHWEST_OFFSET 0xc00000
> +#define APL_GPIO_SOUTHWEST_SIZE 0x654
> +#define APL_GPIO_NORTHWEST_OFFSET 0xc40000
> +#define APL_GPIO_NORTHWEST_SIZE 0x764
> +#define APL_GPIO_NORTH_OFFSET 0xc50000
> +#define APL_GPIO_NORTH_SIZE 0x76c

drivers/pinctrl/intel/pinctrl-broxton.c:653
BXT_COMMUNITY(0, 77),

> +#define APL_GPIO_WEST_OFFSET 0xc70000
> +#define APL_GPIO_WEST_SIZE 0x674

All these sizes correlate with 4 magic numbers from pinctrl-broxton.

SIZE - 0x500 (pad_base?) - 4 (no clue) / 8

It might be worth basing both numbers on a define and giving the magic
numbers some names.

But all this seems like duplication of pinctrl-broxton, maybe the
pinctrl driver should unhide the p2sb ...

regards,
Henning

> +
> +#define APL_GPIO_NR_DEVICES 4
> +#define APL_GPIO_IRQ 14
> +
> +static struct resource apl_gpio_resources[APL_GPIO_NR_DEVICES][2] = {
> + {
> + DEFINE_RES_MEM(APL_GPIO_NORTH_OFFSET,
> APL_GPIO_NORTH_SIZE),
> + DEFINE_RES_IRQ(APL_GPIO_IRQ),
> + },
> + {
> + DEFINE_RES_MEM(APL_GPIO_NORTHWEST_OFFSET,
> APL_GPIO_NORTHWEST_SIZE),
> + DEFINE_RES_IRQ(APL_GPIO_IRQ),
> + },
> + {
> + DEFINE_RES_MEM(APL_GPIO_WEST_OFFSET,
> APL_GPIO_WEST_SIZE),
> + DEFINE_RES_IRQ(APL_GPIO_IRQ),
> + },
> + {
> + DEFINE_RES_MEM(APL_GPIO_SOUTHWEST_OFFSET,
> APL_GPIO_SOUTHWEST_SIZE),
> + DEFINE_RES_IRQ(APL_GPIO_IRQ),
> + },
> +};
> +
> +/* The order must be in sync with apl_pinctrl_soc_data */
> +static const struct mfd_cell apl_gpio_devices[APL_GPIO_NR_DEVICES] =
> {
> + {
> + /* North */
> + .name = "apollolake-pinctrl",
> + .id = 0,
> + .num_resources = ARRAY_SIZE(apl_gpio_resources[0]),
> + .resources = apl_gpio_resources[0],
> + .ignore_resource_conflicts = true,
> + },
> + {
> + /* NorthWest */
> + .name = "apollolake-pinctrl",
> + .id = 1,
> + .num_resources = ARRAY_SIZE(apl_gpio_resources[1]),
> + .resources = apl_gpio_resources[1],
> + .ignore_resource_conflicts = true,
> + },
> + {
> + /* West */
> + .name = "apollolake-pinctrl",
> + .id = 2,
> + .num_resources = ARRAY_SIZE(apl_gpio_resources[2]),
> + .resources = apl_gpio_resources[2],
> + .ignore_resource_conflicts = true,
> + },
> + {
> + /* SouthWest */
> + .name = "apollolake-pinctrl",
> + .id = 3,
> + .num_resources = ARRAY_SIZE(apl_gpio_resources[3]),
> + .resources = apl_gpio_resources[3],
> + .ignore_resource_conflicts = true,
> + },
> +};
>
> static struct mfd_cell lpc_ich_spi_cell = {
> .name = "intel-spi",
> @@ -1082,6 +1151,29 @@ static int lpc_ich_init_wdt(struct pci_dev
> *dev) return ret;
> }
>
> +static int lpc_ich_init_pinctrl(struct pci_dev *dev)
> +{
> + struct resource base;
> + unsigned int i;
> + int ret;
> +
> + ret = pci_p2sb_bar(dev, PCI_DEVFN(13, 0), &base);
> + if (ret)
> + return ret;
> +
> + for (i = 0; i < ARRAY_SIZE(apl_gpio_devices); i++) {
> + struct resource *mem = &apl_gpio_resources[i][0];
> +
> + /* Fill MEM resource */
> + mem->start += base.start;
> + mem->end += base.start;
> + mem->flags = base.flags;
> + }
> +
> + return mfd_add_devices(&dev->dev, 0, apl_gpio_devices,
> + ARRAY_SIZE(apl_gpio_devices), NULL,
> 0, NULL); +}
> +
> static void lpc_ich_test_spi_write(struct pci_dev *dev, unsigned int
> devfn, struct intel_spi_boardinfo *info)
> {
> @@ -1198,6 +1290,12 @@ static int lpc_ich_probe(struct pci_dev *dev,
> cell_added = true;
> }
>
> + if (priv->chipset == LPC_APL) {
> + ret = lpc_ich_init_pinctrl(dev);
> + if (!ret)
> + cell_added = true;
> + }
> +
> if (lpc_chipset_info[priv->chipset].spi_type) {
> ret = lpc_ich_init_spi(dev);
> if (!ret)