ipq40xx: add IPQ4019 SD/MMC controller support

This commit finally adds support for the built in SD/MMC controller in IPQ4019 SoC.

Controller is supported by the upstream SDHCI-MSM driver with a minor clock setting patch.
Patch is special to the IPQ4019 and cannot be upstreamed.

LDO and SDHCI node are upstreamed, and LDO node is awaiting to be accepted.

Signed-off-by: Robert Marko <robimarko@gmail.com>

1 files changed, 153 insertions, 0 deletions

diff --git a/target/linux/ipq40xx/patches-4.19/088-v5.6-regulator-add-IPQ4019-SDHCI-VQMMC-LDO-driver.patch b/target/linux/ipq40xx/patches-4.19/088-v5.6-regulator-add-IPQ4019-SDHCI-VQMMC-LDO-driver.patch
new file mode 100644
index 0000000000..6b46cda941
--- /dev/null
+++ b/target/linux/ipq40xx/patches-4.19/088-v5.6-regulator-add-IPQ4019-SDHCI-VQMMC-LDO-driver.patch
@@ -0,0 +1,153 @@
+From 97043d292365ae39d62b54a6d79dff98d048b501 Mon Sep 17 00:00:00 2001
+From: Robert Marko <robert.marko@sartura.hr>
+Date: Wed, 22 Jan 2020 12:44:14 +0100
+Subject: [PATCH] From ebf652b408200504194be32ad0a3f5bb49d6000a Mon Sep 17
+ 00:00:00 2001 From: Robert Marko <robert.marko@sartura.hr> Date: Sun, 12 Jan
+ 2020 12:30:01 +0100 Subject: [PATCH] regulator: add IPQ4019 SDHCI VQMMC LDO
+ driver
+
+This introduces the IPQ4019 VQMMC LDO driver needed for
+the SD/EMMC driver I/O level operation.
+This will enable introducing SD/EMMC support for the built-in controller.
+
+Signed-off-by: Mantas Pucka <mantas@8devices.com>
+Signed-off-by: Robert Marko <robert.marko@sartura.hr>
+Link: https://lore.kernel.org/r/20200112113003.11110-1-robert.marko@sartura.hr
+Signed-off-by: Mark Brown <broonie@kernel.org>
+---
+ drivers/regulator/Kconfig                   |   7 ++
+ drivers/regulator/Makefile                  |   1 +
+ drivers/regulator/vqmmc-ipq4019-regulator.c | 101 ++++++++++++++++++++
+ 3 files changed, 109 insertions(+)
+ create mode 100644 drivers/regulator/vqmmc-ipq4019-regulator.c
+
+--- a/drivers/regulator/Kconfig
++++ b/drivers/regulator/Kconfig
+@@ -981,6 +981,13 @@ config REGULATOR_VEXPRESS
+ 	  This driver provides support for voltage regulators available
+ 	  on the ARM Ltd's Versatile Express platform.
+ 
++config REGULATOR_VQMMC_IPQ4019
++	tristate "IPQ4019 VQMMC SD LDO regulator support"
++	depends on ARCH_QCOM
++	help
++	  This driver provides support for the VQMMC LDO I/0
++	  voltage regulator of the IPQ4019 SD/EMMC controller.
++
+ config REGULATOR_WM831X
+ 	tristate "Wolfson Microelectronics WM831x PMIC regulators"
+ 	depends on MFD_WM831X
+--- a/drivers/regulator/Makefile
++++ b/drivers/regulator/Makefile
+@@ -122,6 +122,7 @@ obj-$(CONFIG_REGULATOR_TWL4030) += twl-r
+ obj-$(CONFIG_REGULATOR_UNIPHIER) += uniphier-regulator.o
+ obj-$(CONFIG_REGULATOR_VCTRL) += vctrl-regulator.o
+ obj-$(CONFIG_REGULATOR_VEXPRESS) += vexpress-regulator.o
++obj-$(CONFIG_REGULATOR_VQMMC_IPQ4019) += vqmmc-ipq4019-regulator.o
+ obj-$(CONFIG_REGULATOR_WM831X) += wm831x-dcdc.o
+ obj-$(CONFIG_REGULATOR_WM831X) += wm831x-isink.o
+ obj-$(CONFIG_REGULATOR_WM831X) += wm831x-ldo.o
+--- /dev/null
++++ b/drivers/regulator/vqmmc-ipq4019-regulator.c
+@@ -0,0 +1,101 @@
++// SPDX-License-Identifier: GPL-2.0+
++//
++// Copyright (c) 2019 Mantas Pucka <mantas@8devices.com>
++// Copyright (c) 2019 Robert Marko <robert.marko@sartura.hr>
++//
++// Driver for IPQ4019 SD/MMC controller's I/O LDO voltage regulator
++
++#include <linux/io.h>
++#include <linux/module.h>
++#include <linux/of.h>
++#include <linux/platform_device.h>
++#include <linux/regmap.h>
++#include <linux/regulator/driver.h>
++#include <linux/regulator/machine.h>
++#include <linux/regulator/of_regulator.h>
++
++static const unsigned int ipq4019_vmmc_voltages[] = {
++	1500000, 1800000, 2500000, 3000000,
++};
++
++static const struct regulator_ops ipq4019_regulator_voltage_ops = {
++	.list_voltage = regulator_list_voltage_table,
++	.map_voltage = regulator_map_voltage_ascend,
++	.get_voltage_sel = regulator_get_voltage_sel_regmap,
++	.set_voltage_sel = regulator_set_voltage_sel_regmap,
++};
++
++static const struct regulator_desc vmmc_regulator = {
++	.name		= "vmmcq",
++	.ops		= &ipq4019_regulator_voltage_ops,
++	.type		= REGULATOR_VOLTAGE,
++	.owner		= THIS_MODULE,
++	.volt_table	= ipq4019_vmmc_voltages,
++	.n_voltages	= ARRAY_SIZE(ipq4019_vmmc_voltages),
++	.vsel_reg	= 0,
++	.vsel_mask	= 0x3,
++};
++
++static const struct regmap_config ipq4019_vmmcq_regmap_config = {
++	.reg_bits	= 32,
++	.reg_stride	= 4,
++	.val_bits	= 32,
++};
++
++static int ipq4019_regulator_probe(struct platform_device *pdev)
++{
++	struct device *dev = &pdev->dev;
++	struct regulator_init_data *init_data;
++	struct regulator_config cfg = {};
++	struct regulator_dev *rdev;
++	struct resource *res;
++	struct regmap *rmap;
++	void __iomem *base;
++
++	init_data = of_get_regulator_init_data(dev, dev->of_node,
++					       &vmmc_regulator);
++	if (!init_data)
++		return -EINVAL;
++
++	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
++	base = devm_ioremap_resource(dev, res);
++	if (IS_ERR(base))
++		return PTR_ERR(base);
++
++	rmap = devm_regmap_init_mmio(dev, base, &ipq4019_vmmcq_regmap_config);
++	if (IS_ERR(rmap))
++		return PTR_ERR(rmap);
++
++	cfg.dev = dev;
++	cfg.init_data = init_data;
++	cfg.of_node = dev->of_node;
++	cfg.regmap = rmap;
++
++	rdev = devm_regulator_register(dev, &vmmc_regulator, &cfg);
++	if (IS_ERR(rdev)) {
++		dev_err(dev, "Failed to register regulator: %ld\n",
++			PTR_ERR(rdev));
++		return PTR_ERR(rdev);
++	}
++	platform_set_drvdata(pdev, rdev);
++
++	return 0;
++}
++
++static const struct of_device_id regulator_ipq4019_of_match[] = {
++	{ .compatible = "qcom,vqmmc-ipq4019-regulator", },
++	{},
++};
++
++static struct platform_driver ipq4019_regulator_driver = {
++	.probe = ipq4019_regulator_probe,
++	.driver = {
++		.name = "vqmmc-ipq4019-regulator",
++		.of_match_table = of_match_ptr(regulator_ipq4019_of_match),
++	},
++};
++module_platform_driver(ipq4019_regulator_driver);
++
++MODULE_LICENSE("GPL");
++MODULE_AUTHOR("Mantas Pucka <mantas@8devices.com>");
++MODULE_DESCRIPTION("IPQ4019 VQMMC voltage regulator");