pinctrl: mvebu: new driver for Orion platforms

This commit extends the pinctrl mvebu logic with a new driver to cover
Orion5x SoC. It supports the definitions for the 5181l, 5182 and 5281
variants of Orion5x, which are the three ones supported by the old
style MPP code in arch/arm/mach-orion5x/.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Acked-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

3 files changed, 266 insertions, 0 deletions

diff --git a/drivers/pinctrl/mvebu/Kconfig b/drivers/pinctrl/mvebu/Kconfig
index cc298fad..d6dd835 100644
--- a/drivers/pinctrl/mvebu/Kconfig
+++ b/drivers/pinctrl/mvebu/Kconfig
@@ -30,4 +30,8 @@ config PINCTRL_ARMADA_XP
 	bool
 	select PINCTRL_MVEBU
 
+config PINCTRL_ORION
+	bool
+	select PINCTRL_MVEBU
+
 endif
diff --git a/drivers/pinctrl/mvebu/Makefile b/drivers/pinctrl/mvebu/Makefile
index bc1b9f1..a0818e9 100644
--- a/drivers/pinctrl/mvebu/Makefile
+++ b/drivers/pinctrl/mvebu/Makefile
@@ -5,3 +5,4 @@ obj-$(CONFIG_PINCTRL_ARMADA_370) += pinctrl-armada-370.o
 obj-$(CONFIG_PINCTRL_ARMADA_375) += pinctrl-armada-375.o
 obj-$(CONFIG_PINCTRL_ARMADA_38X) += pinctrl-armada-38x.o
 obj-$(CONFIG_PINCTRL_ARMADA_XP)  += pinctrl-armada-xp.o
+obj-$(CONFIG_PINCTRL_ORION)  += pinctrl-orion.o
diff --git a/drivers/pinctrl/mvebu/pinctrl-orion.c b/drivers/pinctrl/mvebu/pinctrl-orion.c
new file mode 100644
index 0000000..dda1e72
--- /dev/null
+++ b/drivers/pinctrl/mvebu/pinctrl-orion.c
@@ -0,0 +1,261 @@
+/*
+ * Marvell Orion pinctrl driver based on mvebu pinctrl core
+ *
+ * Author: Thomas Petazzoni <thomas.petazzoni@free-electrons.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; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * The first 16 MPP pins on Orion are easy to handle: they are
+ * configured through 2 consecutive registers, located at the base
+ * address of the MPP device.
+ *
+ * However the last 4 MPP pins are handled by a register at offset
+ * 0x50 from the base address, so it is not consecutive with the first
+ * two registers.
+ */
+
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/pinctrl/pinctrl.h>
+
+#include "pinctrl-mvebu.h"
+
+static void __iomem *mpp_base;
+static void __iomem *high_mpp_base;
+
+static int orion_mpp_ctrl_get(unsigned pid, unsigned long *config)
+{
+	unsigned shift = (pid % MVEBU_MPPS_PER_REG) * MVEBU_MPP_BITS;
+
+	if (pid < 16) {
+		unsigned off = (pid / MVEBU_MPPS_PER_REG) * MVEBU_MPP_BITS;
+		*config = (readl(mpp_base + off) >> shift) & MVEBU_MPP_MASK;
+	}
+	else {
+		*config = (readl(high_mpp_base) >> shift) & MVEBU_MPP_MASK;
+	}
+
+	return 0;
+}
+
+static int orion_mpp_ctrl_set(unsigned pid, unsigned long config)
+{
+	unsigned shift = (pid % MVEBU_MPPS_PER_REG) * MVEBU_MPP_BITS;
+
+	if (pid < 16) {
+		unsigned off = (pid / MVEBU_MPPS_PER_REG) * MVEBU_MPP_BITS;
+		u32 reg = readl(mpp_base + off) & ~(MVEBU_MPP_MASK << shift);
+		writel(reg | (config << shift), mpp_base + off);
+	}
+	else {
+		u32 reg = readl(high_mpp_base) & ~(MVEBU_MPP_MASK << shift);
+		writel(reg | (config << shift), high_mpp_base);
+	}
+
+	return 0;
+}
+
+#define V(f5181l, f5182, f5281) \
+	((f5181l << 0) | (f5182 << 1) | (f5281 << 2))
+
+enum orion_variant {
+	V_5181L = V(1, 0, 0),
+	V_5182  = V(0, 1, 0),
+	V_5281  = V(0, 0, 1),
+	V_ALL   = V(1, 1, 1),
+};
+
+static struct mvebu_mpp_mode orion_mpp_modes[] = {
+	MPP_MODE(0,
+		 MPP_VAR_FUNCTION(0x0, "pcie", "rstout",    V_ALL),
+		 MPP_VAR_FUNCTION(0x2, "pci", "req2",       V_ALL),
+		 MPP_VAR_FUNCTION(0x3, "gpio", NULL,        V_ALL)),
+	MPP_MODE(1,
+		 MPP_VAR_FUNCTION(0x0, "gpio", NULL,        V_ALL),
+		 MPP_VAR_FUNCTION(0x2, "pci", "gnt2",       V_ALL)),
+	MPP_MODE(2,
+		 MPP_VAR_FUNCTION(0x0, "gpio", NULL,        V_ALL),
+		 MPP_VAR_FUNCTION(0x2, "pci", "req3",       V_ALL),
+		 MPP_VAR_FUNCTION(0x3, "pci-1", "pme",      V_ALL)),
+	MPP_MODE(3,
+		 MPP_VAR_FUNCTION(0x0, "gpio", NULL,        V_ALL),
+		 MPP_VAR_FUNCTION(0x2, "pci", "gnt3",       V_ALL)),
+	MPP_MODE(4,
+		 MPP_VAR_FUNCTION(0x0, "gpio", NULL,        V_ALL),
+		 MPP_VAR_FUNCTION(0x2, "pci", "req4",       V_ALL),
+		 MPP_VAR_FUNCTION(0x4, "bootnand", "re",    V_5182 | V_5281),
+		 MPP_VAR_FUNCTION(0x5, "sata0", "prsnt",    V_5182)),
+	MPP_MODE(5,
+		 MPP_VAR_FUNCTION(0x0, "gpio", NULL,        V_ALL),
+		 MPP_VAR_FUNCTION(0x2, "pci", "gnt4",       V_ALL),
+		 MPP_VAR_FUNCTION(0x4, "bootnand", "we",    V_5182 | V_5281),
+		 MPP_VAR_FUNCTION(0x5, "sata1", "prsnt",    V_5182)),
+	MPP_MODE(6,
+		 MPP_VAR_FUNCTION(0x0, "gpio", NULL,        V_ALL),
+		 MPP_VAR_FUNCTION(0x2, "pci", "req5",       V_ALL),
+		 MPP_VAR_FUNCTION(0x4, "nand", "re0",       V_5182 | V_5281),
+		 MPP_VAR_FUNCTION(0x5, "pci-1", "clk",      V_5181L),
+		 MPP_VAR_FUNCTION(0x5, "sata0", "act",      V_5182)),
+	MPP_MODE(7,
+		 MPP_VAR_FUNCTION(0x0, "gpio", NULL,        V_ALL),
+		 MPP_VAR_FUNCTION(0x2, "pci", "gnt5",       V_ALL),
+		 MPP_VAR_FUNCTION(0x4, "nand", "we0",       V_5182 | V_5281),
+		 MPP_VAR_FUNCTION(0x5, "pci-1", "clk",      V_5181L),
+		 MPP_VAR_FUNCTION(0x5, "sata1", "act",      V_5182)),
+	MPP_MODE(8,
+		 MPP_VAR_FUNCTION(0x0, "gpio", NULL,        V_ALL),
+		 MPP_VAR_FUNCTION(0x1, "ge", "col",         V_ALL)),
+	MPP_MODE(9,
+		 MPP_VAR_FUNCTION(0x0, "gpio", NULL,        V_ALL),
+		 MPP_VAR_FUNCTION(0x1, "ge", "rxerr",       V_ALL)),
+	MPP_MODE(10,
+		 MPP_VAR_FUNCTION(0x0, "gpio", NULL,        V_ALL),
+		 MPP_VAR_FUNCTION(0x1, "ge", "crs",         V_ALL)),
+	MPP_MODE(11,
+		 MPP_VAR_FUNCTION(0x0, "gpio", NULL,        V_ALL),
+		 MPP_VAR_FUNCTION(0x1, "ge", "txerr",       V_ALL)),
+	MPP_MODE(12,
+		 MPP_VAR_FUNCTION(0x0, "gpio", NULL,        V_ALL),
+		 MPP_VAR_FUNCTION(0x1, "ge", "txd4",        V_ALL),
+		 MPP_VAR_FUNCTION(0x4, "nand", "re1",       V_5182 | V_5281),
+		 MPP_VAR_FUNCTION(0x5, "sata0", "ledprsnt", V_5182)),
+	MPP_MODE(13,
+		 MPP_VAR_FUNCTION(0x0, "gpio", NULL,        V_ALL),
+		 MPP_VAR_FUNCTION(0x1, "ge", "txd5",        V_ALL),
+		 MPP_VAR_FUNCTION(0x4, "nand", "we1",       V_5182 | V_5281),
+		 MPP_VAR_FUNCTION(0x5, "sata1", "ledprsnt", V_5182)),
+	MPP_MODE(14,
+		 MPP_VAR_FUNCTION(0x0, "gpio", NULL,        V_ALL),
+		 MPP_VAR_FUNCTION(0x1, "ge", "txd6",        V_ALL),
+		 MPP_VAR_FUNCTION(0x4, "nand", "re2",       V_5182 | V_5281),
+		 MPP_VAR_FUNCTION(0x5, "sata0", "ledact",   V_5182)),
+	MPP_MODE(15,
+		 MPP_VAR_FUNCTION(0x0, "gpio", NULL,        V_ALL),
+		 MPP_VAR_FUNCTION(0x1, "ge", "txd7",        V_ALL),
+		 MPP_VAR_FUNCTION(0x4, "nand", "we2",       V_5182 | V_5281),
+		 MPP_VAR_FUNCTION(0x5, "sata1", "ledact",   V_5182)),
+	MPP_MODE(16,
+		 MPP_VAR_FUNCTION(0x0, "uart1", "rxd",      V_5182 | V_5281),
+		 MPP_VAR_FUNCTION(0x1, "ge", "rxd4",        V_ALL),
+		 MPP_VAR_FUNCTION(0x5, "gpio", NULL,        V_5182)),
+	MPP_MODE(17,
+		 MPP_VAR_FUNCTION(0x0, "uart1", "txd",      V_5182 | V_5281),
+		 MPP_VAR_FUNCTION(0x1, "ge", "rxd5",        V_ALL),
+		 MPP_VAR_FUNCTION(0x5, "gpio", NULL,        V_5182)),
+	MPP_MODE(18,
+		 MPP_VAR_FUNCTION(0x0, "uart1", "cts",      V_5182 | V_5281),
+		 MPP_VAR_FUNCTION(0x1, "ge", "rxd6",        V_ALL),
+		 MPP_VAR_FUNCTION(0x5, "gpio", NULL,        V_5182)),
+	MPP_MODE(19,
+		 MPP_VAR_FUNCTION(0x0, "uart1", "rts",      V_5182 | V_5281),
+		 MPP_VAR_FUNCTION(0x1, "ge", "rxd7",        V_ALL),
+		 MPP_VAR_FUNCTION(0x5, "gpio", NULL,        V_5182)),
+};
+
+static struct mvebu_mpp_ctrl orion_mpp_controls[] = {
+	MPP_FUNC_CTRL(0, 19, NULL, orion_mpp_ctrl),
+};
+
+static struct pinctrl_gpio_range mv88f5181l_gpio_ranges[] = {
+	MPP_GPIO_RANGE(0, 0, 0, 16),
+};
+
+static struct pinctrl_gpio_range mv88f5182_gpio_ranges[] = {
+	MPP_GPIO_RANGE(0, 0, 0, 19),
+};
+
+static struct pinctrl_gpio_range mv88f5281_gpio_ranges[] = {
+	MPP_GPIO_RANGE(0, 0, 0, 16),
+};
+
+static struct mvebu_pinctrl_soc_info mv88f5181l_info = {
+	.variant = V_5181L,
+	.controls = orion_mpp_controls,
+	.ncontrols = ARRAY_SIZE(orion_mpp_controls),
+	.modes = orion_mpp_modes,
+	.nmodes = ARRAY_SIZE(orion_mpp_modes),
+	.gpioranges = mv88f5181l_gpio_ranges,
+	.ngpioranges = ARRAY_SIZE(mv88f5181l_gpio_ranges),
+};
+
+static struct mvebu_pinctrl_soc_info mv88f5182_info = {
+	.variant = V_5182,
+	.controls = orion_mpp_controls,
+	.ncontrols = ARRAY_SIZE(orion_mpp_controls),
+	.modes = orion_mpp_modes,
+	.nmodes = ARRAY_SIZE(orion_mpp_modes),
+	.gpioranges = mv88f5182_gpio_ranges,
+	.ngpioranges = ARRAY_SIZE(mv88f5182_gpio_ranges),
+};
+
+static struct mvebu_pinctrl_soc_info mv88f5281_info = {
+	.variant = V_5281,
+	.controls = orion_mpp_controls,
+	.ncontrols = ARRAY_SIZE(orion_mpp_controls),
+	.modes = orion_mpp_modes,
+	.nmodes = ARRAY_SIZE(orion_mpp_modes),
+	.gpioranges = mv88f5281_gpio_ranges,
+	.ngpioranges = ARRAY_SIZE(mv88f5281_gpio_ranges),
+};
+
+/*
+ * There are multiple variants of the Orion SoCs, but in terms of pin
+ * muxing, they are identical.
+ */
+static struct of_device_id orion_pinctrl_of_match[] = {
+	{ .compatible = "marvell,88f5181l-pinctrl", .data = &mv88f5181l_info },
+	{ .compatible = "marvell,88f5182-pinctrl", .data = &mv88f5182_info },
+	{ .compatible = "marvell,88f5281-pinctrl", .data = &mv88f5281_info },
+	{ }
+};
+
+static int orion_pinctrl_probe(struct platform_device *pdev)
+{
+	const struct of_device_id *match =
+		of_match_device(orion_pinctrl_of_match, &pdev->dev);
+	struct resource *res;
+
+	pdev->dev.platform_data = (void*)match->data;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	mpp_base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(mpp_base))
+		return PTR_ERR(mpp_base);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	high_mpp_base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(high_mpp_base))
+		return PTR_ERR(high_mpp_base);
+
+	return mvebu_pinctrl_probe(pdev);
+}
+
+static int orion_pinctrl_remove(struct platform_device *pdev)
+{
+	return mvebu_pinctrl_remove(pdev);
+}
+
+static struct platform_driver orion_pinctrl_driver = {
+	.driver = {
+		.name = "orion-pinctrl",
+		.owner = THIS_MODULE,
+		.of_match_table = of_match_ptr(orion_pinctrl_of_match),
+	},
+	.probe = orion_pinctrl_probe,
+	.remove = orion_pinctrl_remove,
+};
+
+module_platform_driver(orion_pinctrl_driver);
+
+MODULE_AUTHOR("Thomas Petazzoni <thomas.petazzoni@free-electrons.com>");
+MODULE_DESCRIPTION("Marvell Orion pinctrl driver");
+MODULE_LICENSE("GPL v2");