From b25a45ca46478bb5b0989f7e3f3aa5bdd8b36ef2 Mon Sep 17 00:00:00 2001 From: Duncan Laurie Date: Tue, 10 May 2016 15:56:16 -0700 Subject: [PATCH] skylake: Add SD card device to configure card detect GPIO Add a PCI driver for the skylake SD card device and have it generate an entry in the SSDT for the card detect GPIO if it is provided by the mainboard in devicetree. This sets up a card detect GPIO configuration that will trigger an interrupt on both edges with a 100ms debounce timeout and can wake the SD controller from D3 state. The GpioInt() entry is bound to the "cd-gpio" device property which will be consumed by the kernel driver. The resulting ACPI output in the SSDT will be combined with the SDXC device declaration in the DSDT. Example: Scope (\_SB.PCI0.SDXC) { Name (_CRS, ResourceTemplate () { GpioInt (Edge, ActiveBoth, SharedAndWake, PullNone, 10000, "\\_SB.PCI0.GPIO", 0, ResourceConsumer) { 35 } }) Name (_DSD, Package () { ToUUID ("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"), Package () { Package () { "cd-gpio", Package () { \_SB.PCI0.SDXC, 0, 0, 1 } } } }) } Change-Id: Ie4c1bfadd962cf55a987edb9ef86e92174205770 Signed-off-by: Duncan Laurie Reviewed-on: https://review.coreboot.org/14995 Tested-by: build bot (Jenkins) Reviewed-by: Aaron Durbin --- src/soc/intel/skylake/Makefile.inc | 1 + src/soc/intel/skylake/chip.h | 18 +++++++ src/soc/intel/skylake/sd.c | 87 ++++++++++++++++++++++++++++++ 3 files changed, 106 insertions(+) create mode 100644 src/soc/intel/skylake/sd.c diff --git a/src/soc/intel/skylake/Makefile.inc b/src/soc/intel/skylake/Makefile.inc index e22214f343..ea1895d9c6 100644 --- a/src/soc/intel/skylake/Makefile.inc +++ b/src/soc/intel/skylake/Makefile.inc @@ -53,6 +53,7 @@ ramstage-y += pei_data.c ramstage-y += pmc.c ramstage-y += pmutil.c ramstage-y += ramstage.c +ramstage-y += sd.c ramstage-y += smbus.c ramstage-y += smbus_common.c ramstage-y += smi.c diff --git a/src/soc/intel/skylake/chip.h b/src/soc/intel/skylake/chip.h index 891047971c..2db84b7f25 100644 --- a/src/soc/intel/skylake/chip.h +++ b/src/soc/intel/skylake/chip.h @@ -19,6 +19,7 @@ #ifndef _SOC_CHIP_H_ #define _SOC_CHIP_H_ +#include #include #include #include @@ -339,6 +340,23 @@ struct soc_intel_skylake_config { u8 SendVrMbxCmd; /* Statically clock gate 8254 PIT. */ u8 clock_gate_8254; + + /* + * Use SD card detect GPIO with default config: + * - Edge triggered + * - No internal pull + * - Active both (high + low) + * - Can wake device from D3 + * - 100ms debounce timeout + * + * GpioInt (Edge, ActiveBoth, SharedAndWake, PullNone, 10000, + * "\\_SB.PCI0.GPIO", 0, ResourceConsumer) + * { sdcard_cd_gpio_default } + */ + unsigned sdcard_cd_gpio_default; + + /* Use custom SD card detect GPIO configuration */ + struct acpi_gpio sdcard_cd_gpio; }; typedef struct soc_intel_skylake_config config_t; diff --git a/src/soc/intel/skylake/sd.c b/src/soc/intel/skylake/sd.c new file mode 100644 index 0000000000..80adb9c467 --- /dev/null +++ b/src/soc/intel/skylake/sd.c @@ -0,0 +1,87 @@ +/* + * This file is part of the coreboot project. + * + * Copyright 2016 Google Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include +#include +#include +#include +#include +#include +#include +#include "chip.h" + +#if IS_ENABLED(CONFIG_HAVE_ACPI_TABLES) +static void sd_fill_ssdt(struct device *dev) +{ + config_t *config = dev->chip_info; + const char *path; + struct acpi_gpio default_gpio = { + .type = ACPI_GPIO_TYPE_INTERRUPT, + .pull = ACPI_GPIO_PULL_NONE, + .irq.mode = IRQ_EDGE_TRIGGERED, + .irq.polarity = IRQ_ACTIVE_BOTH, + .irq.shared = IRQ_SHARED, + .irq.wake = IRQ_WAKE, + .interrupt_debounce_timeout = 10000, /* 100ms */ + .pin_count = 1, + .pins = { config->sdcard_cd_gpio_default } + }; + + if (!dev->enabled) + return; + + /* Nothing to write if GPIO is not set in devicetree */ + if (!config->sdcard_cd_gpio_default && !config->sdcard_cd_gpio.pins[0]) + return; + + /* Use device path as the Scope for the SSDT */ + path = acpi_device_path(dev); + if (!path) + return; + acpigen_write_scope(path); + acpigen_write_name("_CRS"); + + /* Write GpioInt() as default (if set) or custom from devicetree */ + acpigen_write_resourcetemplate_header(); + if (config->sdcard_cd_gpio_default) + acpi_device_write_gpio(&default_gpio); + else + acpi_device_write_gpio(&config->sdcard_cd_gpio); + acpigen_write_resourcetemplate_footer(); + + /* Bind the cd-gpio name to the GpioInt() resource */ + acpi_dp_write_header(); + acpi_dp_write_gpio("cd-gpio", path, 0, 0, 1); + acpi_dp_write_footer(); + + acpigen_pop_len(); +} +#endif + +static struct device_operations dev_ops = { + .read_resources = &pci_dev_read_resources, + .set_resources = &pci_dev_set_resources, + .enable_resources = &pci_dev_enable_resources, + .ops_pci = &soc_pci_ops, +#if IS_ENABLED(CONFIG_HAVE_ACPI_TABLES) + .acpi_fill_ssdt_generator = &sd_fill_ssdt, +#endif +}; + +static const struct pci_driver pch_sd __pci_driver = { + .ops = &dev_ops, + .vendor = PCI_VENDOR_ID_INTEL, + .device = 0x9d2d +};