linux-kernel - [PATCH v1 2/2] x86/platform/intel-mid: Enable SD card detection on Merrifield

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Date:   Wed, 31 Aug 2016 16:57:13 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: [PATCH v1 2/2] x86/platform/intel-mid: Enable SD card detection on Merrifield

Intel Merrifield platform provides SD card interface. The interface allows user
to plug SD card to extend storage capacity.

Append the essential data to enable SD card detection on it.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 arch/x86/platform/intel-mid/device_libs/Makefile   |  2 +
 .../intel-mid/device_libs/platform_mrfld_sd.c      | 47 ++++++++++++++++++++++
 2 files changed, 49 insertions(+)
 create mode 100644 arch/x86/platform/intel-mid/device_libs/platform_mrfld_sd.c

diff --git a/arch/x86/platform/intel-mid/device_libs/Makefile b/arch/x86/platform/intel-mid/device_libs/Makefile
index a4711b5..429d08b 100644
--- a/arch/x86/platform/intel-mid/device_libs/Makefile
+++ b/arch/x86/platform/intel-mid/device_libs/Makefile
@@ -1,5 +1,7 @@
 # Family-Level Interface Shim (FLIS)
 obj-$(subst m,y,$(CONFIG_PINCTRL_MERRIFIELD)) += platform_mrfld_pinctrl.o
+# SDHCI Devices
+obj-$(subst m,y,$(CONFIG_MMC_SDHCI_PCI)) += platform_mrfld_sd.o
 # WiFi
 obj-$(subst m,y,$(CONFIG_BRCMFMAC_SDIO)) += platform_bcm43xx.o
 # IPC Devices
diff --git a/arch/x86/platform/intel-mid/device_libs/platform_mrfld_sd.c b/arch/x86/platform/intel-mid/device_libs/platform_mrfld_sd.c
new file mode 100644
index 0000000..41e66ed
--- /dev/null
+++ b/arch/x86/platform/intel-mid/device_libs/platform_mrfld_sd.c
@@ -0,0 +1,47 @@
+/*
+ * SDHCI platform data initilization file
+ *
+ * (C) Copyright 2016 Intel Corporation
+ * Author: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
+ *
+ * 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.
+ */
+
+#include <linux/init.h>
+#include <linux/pci.h>
+
+#include <linux/mmc/sdhci-pci-data.h>
+
+#include <asm/intel-mid.h>
+
+#define INTEL_MRFLD_SD			2
+#define INTEL_MRFLD_SD_CD_GPIO		77
+
+static struct sdhci_pci_data mrfld_sdhci_pci_data = {
+	.rst_n_gpio	= -EINVAL,
+	.cd_gpio	= INTEL_MRFLD_SD_CD_GPIO,
+};
+
+static struct sdhci_pci_data *mrfld_sdhci_pci_get_data(struct pci_dev *pdev,
+						       int slotno)
+{
+	unsigned int func = PCI_FUNC(pdev->devfn);
+
+	if (func == INTEL_MRFLD_SD)
+		return &mrfld_sdhci_pci_data;
+
+	return NULL;
+}
+
+static int __init mrfld_sd_init(void)
+{
+	if (intel_mid_identify_cpu() != INTEL_MID_CPU_CHIP_TANGIER)
+		return -ENODEV;
+
+	sdhci_pci_get_data = mrfld_sdhci_pci_get_data;
+	return 0;
+}
+arch_initcall(mrfld_sd_init);
-- 
2.9.3