OF: pinctrl: MIPS: lantiq: adds support for FALCON SoC

Implement support for pinctrl on lantiq/falcon socs. The FALCON has 5 banks
of up to 32 pins.

Signed-off-by: John Crispin <blogic@openwrt.org>
Signed-off-by: Thomas Langer <thomas.langer@lantiq.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Cc: devicetree-discuss@lists.ozlabs.org
Cc: linux-kernel@vger.kernel.org

1 files changed, 468 insertions, 0 deletions

diff --git a/drivers/pinctrl/pinctrl-falcon.c b/drivers/pinctrl/pinctrl-falcon.c
new file mode 100644
index 000000000000..ee7305903470
--- /dev/null
+++ b/drivers/pinctrl/pinctrl-falcon.c
@@ -0,0 +1,468 @@
+/*
+ *  linux/drivers/pinctrl/pinmux-falcon.c
+ *  based on linux/drivers/pinctrl/pinmux-pxa910.c
+ *
+ *  This program is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License version 2 as published
+ *  by the Free Software Foundation.
+ *
+ *  Copyright (C) 2012 Thomas Langer <thomas.langer@lantiq.com>
+ *  Copyright (C) 2012 John Crispin <blogic@openwrt.org>
+ */
+
+#include <linux/gpio.h>
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+#include <linux/export.h>
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/of_address.h>
+#include <linux/of_gpio.h>
+#include <linux/platform_device.h>
+
+#include "pinctrl-lantiq.h"
+
+#include <lantiq_soc.h>
+
+/* Multiplexer Control Register */
+#define LTQ_PADC_MUX(x)         (x * 0x4)
+/* Pull Up Enable Register */
+#define LTQ_PADC_PUEN		0x80
+/* Pull Down Enable Register */
+#define LTQ_PADC_PDEN		0x84
+/* Slew Rate Control Register */
+#define LTQ_PADC_SRC		0x88
+/* Drive Current Control Register */
+#define LTQ_PADC_DCC		0x8C
+/* Pad Control Availability Register */
+#define LTQ_PADC_AVAIL          0xF0
+
+#define pad_r32(p, reg)		ltq_r32(p + reg)
+#define pad_w32(p, val, reg)	ltq_w32(val, p + reg)
+#define pad_w32_mask(c, clear, set, reg) \
+		pad_w32(c, (pad_r32(c, reg) & ~(clear)) | (set), reg)
+
+#define pad_getbit(m, r, p)	(!!(ltq_r32(m + r) & (1 << p)))
+
+#define PORTS			5
+#define PINS			32
+#define PORT(x)                 (x / PINS)
+#define PORT_PIN(x)             (x % PINS)
+
+#define MFP_FALCON(a, f0, f1, f2, f3)		\
+{						\
+	.name = #a,				\
+	.pin = a,				\
+	.func = {				\
+		FALCON_MUX_##f0,		\
+		FALCON_MUX_##f1,		\
+		FALCON_MUX_##f2,		\
+		FALCON_MUX_##f3,		\
+	},					\
+}
+
+#define GRP_MUX(a, m, p)	\
+{				\
+	.name = a,		\
+	.mux = FALCON_MUX_##m,	\
+	.pins = p,		\
+	.npins = ARRAY_SIZE(p),	\
+}
+
+enum falcon_mux {
+	FALCON_MUX_GPIO = 0,
+	FALCON_MUX_RST,
+	FALCON_MUX_NTR,
+	FALCON_MUX_MDIO,
+	FALCON_MUX_LED,
+	FALCON_MUX_SPI,
+	FALCON_MUX_ASC,
+	FALCON_MUX_I2C,
+	FALCON_MUX_HOSTIF,
+	FALCON_MUX_SLIC,
+	FALCON_MUX_JTAG,
+	FALCON_MUX_PCM,
+	FALCON_MUX_MII,
+	FALCON_MUX_PHY,
+	FALCON_MUX_NONE = 0xffff,
+};
+
+static struct pinctrl_pin_desc falcon_pads[PORTS * PINS];
+static int pad_count[PORTS];
+
+static void lantiq_load_pin_desc(struct pinctrl_pin_desc *d, int bank, int len)
+{
+	int base = bank * PINS;
+	int i;
+
+	for (i = 0; i < len; i++) {
+		/* strlen("ioXYZ") + 1 = 6 */
+		char *name = kzalloc(6, GFP_KERNEL);
+		snprintf(name, 6, "io%d", base + i);
+		d[i].number = base + i;
+		d[i].name = name;
+	}
+	pad_count[bank] = len;
+}
+
+static struct ltq_mfp_pin falcon_mfp[] = {
+	/*	pin		f0	f1	f2	f3 */
+	MFP_FALCON(GPIO0,	RST,	GPIO,   NONE,   NONE),
+	MFP_FALCON(GPIO1,	GPIO,	GPIO,   NONE,   NONE),
+	MFP_FALCON(GPIO2,	GPIO,	GPIO,   NONE,   NONE),
+	MFP_FALCON(GPIO3,	GPIO,	GPIO,   NONE,   NONE),
+	MFP_FALCON(GPIO4,	NTR,	GPIO,   NONE,   NONE),
+	MFP_FALCON(GPIO5,	NTR,	GPIO,   NONE,   NONE),
+	MFP_FALCON(GPIO6,	RST,	GPIO,   NONE,   NONE),
+	MFP_FALCON(GPIO7,	MDIO,	GPIO,   NONE,   NONE),
+	MFP_FALCON(GPIO8,	MDIO,	GPIO,   NONE,   NONE),
+	MFP_FALCON(GPIO9,	LED,	GPIO,   NONE,   NONE),
+	MFP_FALCON(GPIO10,	LED,	GPIO,   NONE,   NONE),
+	MFP_FALCON(GPIO11,	LED,	GPIO,   NONE,   NONE),
+	MFP_FALCON(GPIO12,	LED,	GPIO,   NONE,   NONE),
+	MFP_FALCON(GPIO13,	LED,	GPIO,   NONE,   NONE),
+	MFP_FALCON(GPIO14,	LED,	GPIO,   NONE,   NONE),
+	MFP_FALCON(GPIO32,	ASC,	GPIO,   NONE,   NONE),
+	MFP_FALCON(GPIO33,	ASC,	GPIO,   NONE,   NONE),
+	MFP_FALCON(GPIO34,	SPI,	GPIO,	NONE,	NONE),
+	MFP_FALCON(GPIO35,	SPI,	GPIO,	NONE,	NONE),
+	MFP_FALCON(GPIO36,	SPI,	GPIO,	NONE,	NONE),
+	MFP_FALCON(GPIO37,	SPI,	GPIO,	NONE,	NONE),
+	MFP_FALCON(GPIO38,	SPI,	GPIO,	NONE,	NONE),
+	MFP_FALCON(GPIO39,	I2C,	GPIO,	NONE,	NONE),
+	MFP_FALCON(GPIO40,	I2C,	GPIO,	NONE,	NONE),
+	MFP_FALCON(GPIO41,	HOSTIF,	GPIO,	HOSTIF,	JTAG),
+	MFP_FALCON(GPIO42,	HOSTIF,	GPIO,	HOSTIF,	NONE),
+	MFP_FALCON(GPIO43,	SLIC,	GPIO,	NONE,	NONE),
+	MFP_FALCON(GPIO44,	SLIC,	GPIO,	PCM,	ASC),
+	MFP_FALCON(GPIO45,	SLIC,	GPIO,	PCM,	ASC),
+	MFP_FALCON(GPIO64,	MII,	GPIO,	NONE,	NONE),
+	MFP_FALCON(GPIO65,	MII,	GPIO,	NONE,	NONE),
+	MFP_FALCON(GPIO66,	MII,	GPIO,	NONE,	NONE),
+	MFP_FALCON(GPIO67,	MII,	GPIO,	NONE,	NONE),
+	MFP_FALCON(GPIO68,	MII,	GPIO,	NONE,	NONE),
+	MFP_FALCON(GPIO69,	MII,	GPIO,	NONE,	NONE),
+	MFP_FALCON(GPIO70,	MII,	GPIO,	NONE,	NONE),
+	MFP_FALCON(GPIO71,	MII,	GPIO,	NONE,	NONE),
+	MFP_FALCON(GPIO72,	MII,	GPIO,	NONE,	NONE),
+	MFP_FALCON(GPIO73,	MII,	GPIO,	NONE,	NONE),
+	MFP_FALCON(GPIO74,	MII,	GPIO,	NONE,	NONE),
+	MFP_FALCON(GPIO75,	MII,	GPIO,	NONE,	NONE),
+	MFP_FALCON(GPIO76,	MII,	GPIO,	NONE,	NONE),
+	MFP_FALCON(GPIO77,	MII,	GPIO,	NONE,	NONE),
+	MFP_FALCON(GPIO78,	MII,	GPIO,	NONE,	NONE),
+	MFP_FALCON(GPIO79,	MII,	GPIO,	NONE,	NONE),
+	MFP_FALCON(GPIO80,	MII,	GPIO,	NONE,	NONE),
+	MFP_FALCON(GPIO81,	MII,	GPIO,	NONE,	NONE),
+	MFP_FALCON(GPIO82,	MII,	GPIO,	NONE,	NONE),
+	MFP_FALCON(GPIO83,	MII,	GPIO,	NONE,	NONE),
+	MFP_FALCON(GPIO84,	MII,	GPIO,	NONE,	NONE),
+	MFP_FALCON(GPIO85,	MII,	GPIO,	NONE,	NONE),
+	MFP_FALCON(GPIO86,	MII,	GPIO,	NONE,	NONE),
+	MFP_FALCON(GPIO87,	MII,	GPIO,	NONE,	NONE),
+	MFP_FALCON(GPIO88,	PHY,	GPIO,	NONE,	NONE),
+};
+
+static const unsigned pins_por[] = {GPIO0};
+static const unsigned pins_ntr[] = {GPIO4};
+static const unsigned pins_ntr8k[] = {GPIO5};
+static const unsigned pins_hrst[] = {GPIO6};
+static const unsigned pins_mdio[] = {GPIO7, GPIO8};
+static const unsigned pins_bled[] = {GPIO7, GPIO10, GPIO11,
+					GPIO12, GPIO13, GPIO14};
+static const unsigned pins_asc0[] = {GPIO32, GPIO33};
+static const unsigned pins_spi[] = {GPIO34, GPIO35, GPIO36};
+static const unsigned pins_spi_cs0[] = {GPIO37};
+static const unsigned pins_spi_cs1[] = {GPIO38};
+static const unsigned pins_i2c[] = {GPIO39, GPIO40};
+static const unsigned pins_jtag[] = {GPIO41};
+static const unsigned pins_slic[] = {GPIO43, GPIO44, GPIO45};
+static const unsigned pins_pcm[] = {GPIO44, GPIO45};
+static const unsigned pins_asc1[] = {GPIO44, GPIO45};
+
+static struct ltq_pin_group falcon_grps[] = {
+	GRP_MUX("por", RST, pins_por),
+	GRP_MUX("ntr", NTR, pins_ntr),
+	GRP_MUX("ntr8k", NTR, pins_ntr8k),
+	GRP_MUX("hrst", RST, pins_hrst),
+	GRP_MUX("mdio", MDIO, pins_mdio),
+	GRP_MUX("bootled", LED, pins_bled),
+	GRP_MUX("asc0", ASC, pins_asc0),
+	GRP_MUX("spi", SPI, pins_spi),
+	GRP_MUX("spi cs0", SPI, pins_spi_cs0),
+	GRP_MUX("spi cs1", SPI, pins_spi_cs1),
+	GRP_MUX("i2c", I2C, pins_i2c),
+	GRP_MUX("jtag", JTAG, pins_jtag),
+	GRP_MUX("slic", SLIC, pins_slic),
+	GRP_MUX("pcm", PCM, pins_pcm),
+	GRP_MUX("asc1", ASC, pins_asc1),
+};
+
+static const char * const ltq_rst_grps[] = {"por", "hrst"};
+static const char * const ltq_ntr_grps[] = {"ntr", "ntr8k"};
+static const char * const ltq_mdio_grps[] = {"mdio"};
+static const char * const ltq_bled_grps[] = {"bootled"};
+static const char * const ltq_asc_grps[] = {"asc0", "asc1"};
+static const char * const ltq_spi_grps[] = {"spi", "spi cs0", "spi cs1"};
+static const char * const ltq_i2c_grps[] = {"i2c"};
+static const char * const ltq_jtag_grps[] = {"jtag"};
+static const char * const ltq_slic_grps[] = {"slic"};
+static const char * const ltq_pcm_grps[] = {"pcm"};
+
+static struct ltq_pmx_func falcon_funcs[] = {
+	{"rst",		ARRAY_AND_SIZE(ltq_rst_grps)},
+	{"ntr",		ARRAY_AND_SIZE(ltq_ntr_grps)},
+	{"mdio",	ARRAY_AND_SIZE(ltq_mdio_grps)},
+	{"led",		ARRAY_AND_SIZE(ltq_bled_grps)},
+	{"asc",		ARRAY_AND_SIZE(ltq_asc_grps)},
+	{"spi",		ARRAY_AND_SIZE(ltq_spi_grps)},
+	{"i2c",		ARRAY_AND_SIZE(ltq_i2c_grps)},
+	{"jtag",	ARRAY_AND_SIZE(ltq_jtag_grps)},
+	{"slic",	ARRAY_AND_SIZE(ltq_slic_grps)},
+	{"pcm",		ARRAY_AND_SIZE(ltq_pcm_grps)},
+};
+
+
+
+
+/* ---------  pinconf related code --------- */
+static int falcon_pinconf_group_get(struct pinctrl_dev *pctrldev,
+				unsigned group, unsigned long *config)
+{
+	return -ENOTSUPP;
+}
+
+static int falcon_pinconf_group_set(struct pinctrl_dev *pctrldev,
+				unsigned group, unsigned long config)
+{
+	return -ENOTSUPP;
+}
+
+static int falcon_pinconf_get(struct pinctrl_dev *pctrldev,
+				unsigned pin, unsigned long *config)
+{
+	struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
+	enum ltq_pinconf_param param = LTQ_PINCONF_UNPACK_PARAM(*config);
+	void __iomem *mem = info->membase[PORT(pin)];
+
+	switch (param) {
+	case LTQ_PINCONF_PARAM_DRIVE_CURRENT:
+		*config = LTQ_PINCONF_PACK(param,
+			!!pad_getbit(mem, LTQ_PADC_DCC, PORT_PIN(pin)));
+		break;
+
+	case LTQ_PINCONF_PARAM_SLEW_RATE:
+		*config = LTQ_PINCONF_PACK(param,
+			!!pad_getbit(mem, LTQ_PADC_SRC, PORT_PIN(pin)));
+		break;
+
+	case LTQ_PINCONF_PARAM_PULL:
+		if (pad_getbit(mem, LTQ_PADC_PDEN, PORT_PIN(pin)))
+			*config = LTQ_PINCONF_PACK(param, 1);
+		else if (pad_getbit(mem, LTQ_PADC_PUEN, PORT_PIN(pin)))
+			*config = LTQ_PINCONF_PACK(param, 2);
+		else
+			*config = LTQ_PINCONF_PACK(param, 0);
+
+		break;
+
+	default:
+		return -ENOTSUPP;
+	}
+
+	return 0;
+}
+
+static int falcon_pinconf_set(struct pinctrl_dev *pctrldev,
+			unsigned pin, unsigned long config)
+{
+	enum ltq_pinconf_param param = LTQ_PINCONF_UNPACK_PARAM(config);
+	int arg = LTQ_PINCONF_UNPACK_ARG(config);
+	struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
+	void __iomem *mem = info->membase[PORT(pin)];
+	u32 reg;
+
+	switch (param) {
+	case LTQ_PINCONF_PARAM_DRIVE_CURRENT:
+		reg = LTQ_PADC_DCC;
+		break;
+
+	case LTQ_PINCONF_PARAM_SLEW_RATE:
+		reg = LTQ_PADC_SRC;
+		break;
+
+	case LTQ_PINCONF_PARAM_PULL:
+		if (arg == 1)
+			reg = LTQ_PADC_PDEN;
+		else
+			reg = LTQ_PADC_PUEN;
+		break;
+
+	default:
+		pr_err("%s: Invalid config param %04x\n",
+		pinctrl_dev_get_name(pctrldev), param);
+		return -ENOTSUPP;
+	}
+
+	pad_w32(mem, BIT(PORT_PIN(pin)), reg);
+	if (!(pad_r32(mem, reg) & BIT(PORT_PIN(pin))))
+		return -ENOTSUPP;
+	return 0;
+}
+
+static void falcon_pinconf_dbg_show(struct pinctrl_dev *pctrldev,
+			struct seq_file *s, unsigned offset)
+{
+}
+
+static void falcon_pinconf_group_dbg_show(struct pinctrl_dev *pctrldev,
+			struct seq_file *s, unsigned selector)
+{
+}
+
+struct pinconf_ops falcon_pinconf_ops = {
+	.pin_config_get			= falcon_pinconf_get,
+	.pin_config_set			= falcon_pinconf_set,
+	.pin_config_group_get		= falcon_pinconf_group_get,
+	.pin_config_group_set		= falcon_pinconf_group_set,
+	.pin_config_dbg_show		= falcon_pinconf_dbg_show,
+	.pin_config_group_dbg_show	= falcon_pinconf_group_dbg_show,
+};
+
+static struct pinctrl_desc falcon_pctrl_desc = {
+	.owner		= THIS_MODULE,
+	.pins		= falcon_pads,
+	.confops	= &falcon_pinconf_ops,
+};
+
+static inline int falcon_mux_apply(struct pinctrl_dev *pctrldev,
+			int mfp, int mux)
+{
+	struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
+	int port = PORT(info->mfp[mfp].pin);
+
+	if ((port >= PORTS) || (!info->membase[port]))
+		return -ENODEV;
+
+	pad_w32(info->membase[port], mux,
+		LTQ_PADC_MUX(PORT_PIN(info->mfp[mfp].pin)));
+	return 0;
+}
+
+static const struct ltq_cfg_param falcon_cfg_params[] = {
+	{"lantiq,pull",			LTQ_PINCONF_PARAM_PULL},
+	{"lantiq,drive-current",	LTQ_PINCONF_PARAM_DRIVE_CURRENT},
+	{"lantiq,slew-rate",		LTQ_PINCONF_PARAM_SLEW_RATE},
+};
+
+static struct ltq_pinmux_info falcon_info = {
+	.desc		= &falcon_pctrl_desc,
+	.apply_mux	= falcon_mux_apply,
+};
+
+
+
+
+/* --------- register the pinctrl layer --------- */
+
+int pinctrl_falcon_get_range_size(int id)
+{
+	u32 avail;
+
+	if ((id >= PORTS) || (!falcon_info.membase[id]))
+		return -EINVAL;
+
+	avail = pad_r32(falcon_info.membase[id], LTQ_PADC_AVAIL);
+
+	return fls(avail);
+}
+
+void pinctrl_falcon_add_gpio_range(struct pinctrl_gpio_range *range)
+{
+	pinctrl_add_gpio_range(falcon_info.pctrl, range);
+}
+
+static int pinctrl_falcon_probe(struct platform_device *pdev)
+{
+	struct device_node *np;
+	int pad_count = 0;
+	int ret = 0;
+
+	/* load and remap the pad resources of the different banks */
+	for_each_compatible_node(np, NULL, "lantiq,pad-falcon") {
+		struct platform_device *ppdev = of_find_device_by_node(np);
+		const __be32 *bank = of_get_property(np, "lantiq,bank", NULL);
+		struct resource res;
+		u32 avail;
+		int pins;
+
+		if (!ppdev) {
+			dev_err(&pdev->dev, "failed to find pad pdev\n");
+			continue;
+		}
+		if (!bank || *bank >= PORTS)
+			continue;
+		if (of_address_to_resource(np, 0, &res))
+			continue;
+		falcon_info.clk[*bank] = clk_get(&ppdev->dev, NULL);
+		if (IS_ERR(falcon_info.clk[*bank])) {
+			dev_err(&ppdev->dev, "failed to get clock\n");
+			return PTR_ERR(falcon_info.clk[*bank]);
+		}
+		falcon_info.membase[*bank] =
+				devm_request_and_ioremap(&pdev->dev, &res);
+		if (!falcon_info.membase[*bank]) {
+			dev_err(&pdev->dev,
+				"Failed to remap memory for bank %d\n",
+				*bank);
+			return -ENOMEM;
+		}
+		avail = pad_r32(falcon_info.membase[*bank],
+					LTQ_PADC_AVAIL);
+		pins = fls(avail);
+		lantiq_load_pin_desc(&falcon_pads[pad_count], *bank, pins);
+		pad_count += pins;
+		clk_enable(falcon_info.clk[*bank]);
+		dev_dbg(&pdev->dev, "found %s with %d pads\n",
+				res.name, pins);
+	}
+	dev_dbg(&pdev->dev, "found a total of %d pads\n", pad_count);
+	falcon_pctrl_desc.name	= dev_name(&pdev->dev);
+	falcon_pctrl_desc.npins	= pad_count;
+
+	falcon_info.mfp		= falcon_mfp;
+	falcon_info.num_mfp	= ARRAY_SIZE(falcon_mfp);
+	falcon_info.grps	= falcon_grps;
+	falcon_info.num_grps	= ARRAY_SIZE(falcon_grps);
+	falcon_info.funcs	= falcon_funcs;
+	falcon_info.num_funcs	= ARRAY_SIZE(falcon_funcs);
+
+	ret = ltq_pinctrl_register(pdev, &falcon_info);
+	if (!ret)
+		dev_info(&pdev->dev, "Init done\n");
+	return ret;
+}
+
+static const struct of_device_id falcon_match[] = {
+	{ .compatible = "lantiq,pinctrl-falcon" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, falcon_match);
+
+static struct platform_driver pinctrl_falcon_driver = {
+	.probe = pinctrl_falcon_probe,
+	.driver = {
+		.name = "pinctrl-falcon",
+		.owner = THIS_MODULE,
+		.of_match_table = falcon_match,
+	},
+};
+
+int __init pinctrl_falcon_init(void)
+{
+	return platform_driver_register(&pinctrl_falcon_driver);
+}
+
+core_initcall_sync(pinctrl_falcon_init);