[PATCH 4/6 v3] input: Add N64 controller driver

[Lauri Kasanen <cand@gmx.com>]

This adds support for the four built-in controller
ports on the Nintendo 64 console. The N64 controller
includes an analog stick, a d-pad, and several buttons.

No module support as the target has only 8mb ram.

Signed-off-by: Lauri Kasanen <cand@gmx.com>
---

v3:
s/to_uncac/ckseg1/

v2:
BIT()
define 4
use a dev struct
cpu_relax
bit-setting helpers
pr_fmt

 drivers/input/joystick/Kconfig  |   6 +
 drivers/input/joystick/Makefile |   2 +-
 drivers/input/joystick/n64joy.c | 322 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 329 insertions(+), 1 deletion(-)
 create mode 100644 drivers/input/joystick/n64joy.c

diff --git a/drivers/input/joystick/Kconfig b/drivers/input/joystick/Kconfig
index b080f0c..e1a8128 100644
--- a/drivers/input/joystick/Kconfig
+++ b/drivers/input/joystick/Kconfig
@@ -382,4 +382,10 @@ config JOYSTICK_FSIA6B
 	  To compile this driver as a module, choose M here: the
 	  module will be called fsia6b.

+config JOYSTICK_N64
+	bool "N64 controller"
+	depends on MACH_NINTENDO64
+	help
+	  Support for the four N64 controllers.
+
 endif
diff --git a/drivers/input/joystick/Makefile b/drivers/input/joystick/Makefile
index 58232b3..31d720c 100644
--- a/drivers/input/joystick/Makefile
+++ b/drivers/input/joystick/Makefile
@@ -24,6 +24,7 @@ obj-$(CONFIG_JOYSTICK_INTERACT)		+= interact.o
 obj-$(CONFIG_JOYSTICK_JOYDUMP)		+= joydump.o
 obj-$(CONFIG_JOYSTICK_MAGELLAN)		+= magellan.o
 obj-$(CONFIG_JOYSTICK_MAPLE)		+= maplecontrol.o
+obj-$(CONFIG_JOYSTICK_N64)		+= n64joy.o
 obj-$(CONFIG_JOYSTICK_PSXPAD_SPI)	+= psxpad-spi.o
 obj-$(CONFIG_JOYSTICK_PXRC)		+= pxrc.o
 obj-$(CONFIG_JOYSTICK_SIDEWINDER)	+= sidewinder.o
@@ -37,4 +38,3 @@ obj-$(CONFIG_JOYSTICK_WARRIOR)		+= warrior.o
 obj-$(CONFIG_JOYSTICK_WALKERA0701)	+= walkera0701.o
 obj-$(CONFIG_JOYSTICK_XPAD)		+= xpad.o
 obj-$(CONFIG_JOYSTICK_ZHENHUA)		+= zhenhua.o
-
diff --git a/drivers/input/joystick/n64joy.c b/drivers/input/joystick/n64joy.c
new file mode 100644
index 0000000..816bd53
--- /dev/null
+++ b/drivers/input/joystick/n64joy.c
@@ -0,0 +1,322 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Support for the four N64 controllers.
+ *
+ * Copyright (c) 2020 Lauri Kasanen
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/input.h>
+#include <linux/limits.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/slab.h>
+#include <linux/timer.h>
+
+#include <asm/addrspace.h>
+#include <asm/io.h>
+
+MODULE_AUTHOR("Lauri Kasanen <cand@gmx.com>");
+MODULE_DESCRIPTION("Driver for N64 controllers");
+MODULE_LICENSE("GPL");
+
+#define PIF_RAM 0x1fc007c0
+#define REG_BASE ((u32 *) CKSEG1ADDR(0x4800000))
+
+#define SI_DRAM_REG 0
+#define SI_READ_REG 1
+#define SI_WRITE_REG 4
+#define SI_STATUS_REG 6
+
+#define SI_STATUS_DMA_BUSY  BIT(0)
+#define SI_STATUS_IO_BUSY   BIT(1)
+
+#define N64_CONTROLLER_ID 0x0500
+
+#define MAX_CONTROLLERS 4
+
+static const char *n64joy_phys[MAX_CONTROLLERS] = {
+	"n64joy/port0",
+	"n64joy/port1",
+	"n64joy/port2",
+	"n64joy/port3",
+};
+
+struct n64joy_priv {
+	u64 si_buf[8] ____cacheline_aligned;
+	struct timer_list timer;
+	struct mutex n64joy_mutex;
+	struct input_dev *n64joy_dev[MAX_CONTROLLERS];
+	u8 n64joy_opened;
+};
+
+struct joydata {
+	unsigned: 16; // unused
+	unsigned err: 2;
+	unsigned: 14; // unused
+
+	union {
+		u32 data;
+
+		struct {
+			unsigned a: 1;
+			unsigned b: 1;
+			unsigned z: 1;
+			unsigned start: 1;
+			unsigned up: 1;
+			unsigned down: 1;
+			unsigned left: 1;
+			unsigned right: 1;
+			unsigned: 2; // unused
+			unsigned l: 1;
+			unsigned r: 1;
+			unsigned c_up: 1;
+			unsigned c_down: 1;
+			unsigned c_left: 1;
+			unsigned c_right: 1;
+			signed x: 8;
+			signed y: 8;
+		};
+	};
+};
+
+static void n64joy_write_reg(const u8 reg, const u32 value)
+{
+	__raw_writel(value, REG_BASE + reg);
+}
+
+static u32 n64joy_read_reg(const u8 reg)
+{
+	return __raw_readl(REG_BASE + reg);
+}
+
+static void n64joy_wait_si_dma(void)
+{
+	while (n64joy_read_reg(SI_STATUS_REG) & (SI_STATUS_DMA_BUSY | SI_STATUS_IO_BUSY))
+		cpu_relax();
+}
+
+static void n64joy_exec_pif(struct n64joy_priv *priv, const u64 in[8])
+{
+	unsigned long flags;
+
+	dma_cache_wback_inv((unsigned long) in, 8 * 8);
+	dma_cache_inv((unsigned long) priv->si_buf, 8 * 8);
+
+	local_irq_save(flags);
+
+	n64joy_wait_si_dma();
+
+	barrier();
+	n64joy_write_reg(SI_DRAM_REG, virt_to_phys(in));
+	barrier();
+	n64joy_write_reg(SI_WRITE_REG, PIF_RAM);
+	barrier();
+
+	n64joy_wait_si_dma();
+
+	barrier();
+	n64joy_write_reg(SI_DRAM_REG, virt_to_phys(priv->si_buf));
+	barrier();
+	n64joy_write_reg(SI_READ_REG, PIF_RAM);
+	barrier();
+
+	n64joy_wait_si_dma();
+
+	local_irq_restore(flags);
+}
+
+static const u64 polldata[] ____cacheline_aligned = {
+	0xff010401ffffffff,
+	0xff010401ffffffff,
+	0xff010401ffffffff,
+	0xff010401ffffffff,
+	0xfe00000000000000,
+	0,
+	0,
+	1
+};
+
+static void n64joy_poll(struct timer_list *t)
+{
+	const struct joydata *data;
+	struct n64joy_priv *priv = container_of(t, struct n64joy_priv, timer);
+	struct input_dev *dev;
+	u32 i;
+
+	n64joy_exec_pif(priv, polldata);
+
+	data = (struct joydata *) priv->si_buf;
+
+	for (i = 0; i < MAX_CONTROLLERS; i++) {
+		if (!priv->n64joy_dev[i])
+			continue;
+
+		dev = priv->n64joy_dev[i];
+
+		// d-pad
+		input_report_key(dev, BTN_DPAD_UP, data[i].up);
+		input_report_key(dev, BTN_DPAD_DOWN, data[i].down);
+		input_report_key(dev, BTN_DPAD_LEFT, data[i].left);
+		input_report_key(dev, BTN_DPAD_RIGHT, data[i].right);
+
+		// c buttons
+		input_report_key(dev, BTN_FORWARD, data[i].c_up);
+		input_report_key(dev, BTN_BACK, data[i].c_down);
+		input_report_key(dev, BTN_LEFT, data[i].c_left);
+		input_report_key(dev, BTN_RIGHT, data[i].c_right);
+
+		// matching buttons
+		input_report_key(dev, BTN_START, data[i].start);
+		input_report_key(dev, BTN_Z, data[i].z);
+
+		// remaining ones: a, b, l, r
+		input_report_key(dev, BTN_0, data[i].a);
+		input_report_key(dev, BTN_1, data[i].b);
+		input_report_key(dev, BTN_2, data[i].l);
+		input_report_key(dev, BTN_3, data[i].r);
+
+		input_report_abs(dev, ABS_X, data[i].x);
+		input_report_abs(dev, ABS_Y, data[i].y);
+
+		input_sync(dev);
+	}
+
+	mod_timer(&priv->timer, jiffies + msecs_to_jiffies(16));
+}
+
+static int n64joy_open(struct input_dev *dev)
+{
+	struct n64joy_priv *priv = input_get_drvdata(dev);
+	int err;
+
+	err = mutex_lock_interruptible(&priv->n64joy_mutex);
+	if (err)
+		return err;
+
+	if (!priv->n64joy_opened) {
+		// Could use the vblank irq, but it's not important if the poll
+		// point slightly changes.
+		timer_setup(&priv->timer, n64joy_poll, 0);
+		mod_timer(&priv->timer, jiffies + msecs_to_jiffies(16));
+	}
+
+	priv->n64joy_opened++;
+
+	mutex_unlock(&priv->n64joy_mutex);
+	return err;
+}
+
+static void n64joy_close(struct input_dev *dev)
+{
+	struct n64joy_priv *priv = input_get_drvdata(dev);
+
+	mutex_lock(&priv->n64joy_mutex);
+	if (!--priv->n64joy_opened)
+		del_timer_sync(&priv->timer);
+	mutex_unlock(&priv->n64joy_mutex);
+}
+
+static const u64 __initconst scandata[] ____cacheline_aligned = {
+	0xff010300ffffffff,
+	0xff010300ffffffff,
+	0xff010300ffffffff,
+	0xff010300ffffffff,
+	0xfe00000000000000,
+	0,
+	0,
+	1
+};
+
+static int __init n64joy_init(void)
+{
+	const struct joydata *data;
+	struct n64joy_priv *priv;
+	struct input_dev *dev;
+	int err = 0;
+	u32 i, j, found = 0;
+
+	priv = kzalloc(sizeof(struct n64joy_priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+	mutex_init(&priv->n64joy_mutex);
+
+	// The controllers are not hotpluggable, so we can scan in init
+	n64joy_exec_pif(priv, scandata);
+
+	data = (struct joydata *) priv->si_buf;
+
+	for (i = 0; i < MAX_CONTROLLERS; i++) {
+		if (!data[i].err && data[i].data >> 16 == N64_CONTROLLER_ID) {
+			found++;
+
+			dev = priv->n64joy_dev[i] = input_allocate_device();
+			if (!priv->n64joy_dev[i]) {
+				err = -ENOMEM;
+				goto fail;
+			}
+
+			input_set_drvdata(dev, priv);
+
+			dev->name = "N64 controller";
+			dev->phys = n64joy_phys[i];
+			dev->id.bustype = BUS_HOST;
+			dev->id.vendor = 0;
+			dev->id.product = data[i].data >> 16;
+			dev->id.version = 0;
+
+			dev->open = n64joy_open;
+			dev->close = n64joy_close;
+
+			// d-pad
+			input_set_capability(dev, EV_KEY, BTN_DPAD_UP);
+			input_set_capability(dev, EV_KEY, BTN_DPAD_DOWN);
+			input_set_capability(dev, EV_KEY, BTN_DPAD_LEFT);
+			input_set_capability(dev, EV_KEY, BTN_DPAD_RIGHT);
+			// c buttons
+			input_set_capability(dev, EV_KEY, BTN_LEFT);
+			input_set_capability(dev, EV_KEY, BTN_RIGHT);
+			input_set_capability(dev, EV_KEY, BTN_FORWARD);
+			input_set_capability(dev, EV_KEY, BTN_BACK);
+			// matching buttons
+			input_set_capability(dev, EV_KEY, BTN_START);
+			input_set_capability(dev, EV_KEY, BTN_Z);
+			// remaining ones: a, b, l, r
+			input_set_capability(dev, EV_KEY, BTN_0);
+			input_set_capability(dev, EV_KEY, BTN_1);
+			input_set_capability(dev, EV_KEY, BTN_2);
+			input_set_capability(dev, EV_KEY, BTN_3);
+
+			for (j = 0; j < 2; j++) {
+				input_set_abs_params(dev, ABS_X + j,
+						     S8_MIN, S8_MAX, 0, 0);
+			}
+
+			err = input_register_device(dev);
+			if (err) {
+				input_free_device(dev);
+				goto fail;
+			}
+		}
+	}
+
+	pr_info("%u controller(s) connected\n", found);
+
+	if (!found)
+		return -ENODEV;
+
+	return 0;
+fail:
+	for (i = 0; i < MAX_CONTROLLERS; i++) {
+		if (!priv->n64joy_dev[i])
+			continue;
+		input_unregister_device(priv->n64joy_dev[i]);
+	}
+	return err;
+}
+
+module_init(n64joy_init);
--
2.6.2