linux-kernel - [PATCH v2] mmc: sdhci-iproc: Add ACPI bindings for the rpi

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Message-Id: <20210120000406.1843400-2-jeremy.linton@arm.com>
Date:   Tue, 19 Jan 2021 18:04:06 -0600
From:   Jeremy Linton <jeremy.linton@....com>
To:     linux-mmc@...r.kernel.org
Cc:     adrian.hunter@...el.com, ulf.hansson@...aro.org, rjui@...adcom.com,
        sbranden@...adcom.com, bcm-kernel-feedback-list@...adcom.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        f.fainelli@...il.com, stefan.wahren@...e.com,
        nsaenzjulienne@...e.de, ardb@...nel.org,
        Jeremy Linton <jeremy.linton@....com>
Subject: [PATCH v2] mmc: sdhci-iproc: Add ACPI bindings for the rpi

The RPi4 has an Arasan controller it carries over
from the RPi3 and a newer eMMC2 controller.
Because of a couple of quirks, it seems wiser to bind
these controllers to the same driver that DT is using
on this platform rather than the generic sdhci_acpi
driver with PNP0D40.

So, BCM2847 describes the older Arasan and
BRCME88C describes the newer eMMC2. The older
Arasan is reusing an existing ACPI _HID used
by other OSs booting these tables on the RPi.

With this change, Linux is capable of utilizing the
SD card slot, and the wifi when booted with
UEFI+ACPI on the rpi4.

Signed-off-by: Jeremy Linton <jeremy.linton@....com>
---
 drivers/mmc/host/sdhci-iproc.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/mmc/host/sdhci-iproc.c b/drivers/mmc/host/sdhci-iproc.c
index c9434b461aab..ddeaf8e1f72f 100644
--- a/drivers/mmc/host/sdhci-iproc.c
+++ b/drivers/mmc/host/sdhci-iproc.c
@@ -296,9 +296,27 @@ static const struct of_device_id sdhci_iproc_of_match[] = {
 MODULE_DEVICE_TABLE(of, sdhci_iproc_of_match);
 
 #ifdef CONFIG_ACPI
+/*
+ * This is a duplicate of bcm2835_(pltfrm_)data without caps quirks
+ * which are provided by the ACPI table.
+ */
+static const struct sdhci_pltfm_data sdhci_bcm_arasan_data = {
+	.quirks = SDHCI_QUIRK_BROKEN_CARD_DETECTION |
+		  SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK |
+		  SDHCI_QUIRK_NO_HISPD_BIT,
+	.quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN,
+	.ops = &sdhci_iproc_32only_ops,
+};
+
+static const struct sdhci_iproc_data bcm_arasan_data = {
+	.pdata = &sdhci_bcm_arasan_data,
+};
+
 static const struct acpi_device_id sdhci_iproc_acpi_ids[] = {
 	{ .id = "BRCM5871", .driver_data = (kernel_ulong_t)&iproc_cygnus_data },
 	{ .id = "BRCM5872", .driver_data = (kernel_ulong_t)&iproc_data },
+	{ .id = "BCM2847",  .driver_data = (kernel_ulong_t)&bcm_arasan_data },
+	{ .id = "BRCME88C", .driver_data = (kernel_ulong_t)&bcm2711_data },
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(acpi, sdhci_iproc_acpi_ids);
-- 
2.26.2