346 lines
7.8 KiB
C
346 lines
7.8 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Support for the four N64 controllers.
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*
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* Copyright (c) 2021 Lauri Kasanen
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/input.h>
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#include <linux/limits.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/timer.h>
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MODULE_AUTHOR("Lauri Kasanen <cand@gmx.com>");
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MODULE_DESCRIPTION("Driver for N64 controllers");
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MODULE_LICENSE("GPL");
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#define PIF_RAM 0x1fc007c0
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#define SI_DRAM_REG 0
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#define SI_READ_REG 1
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#define SI_WRITE_REG 4
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#define SI_STATUS_REG 6
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#define SI_STATUS_DMA_BUSY BIT(0)
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#define SI_STATUS_IO_BUSY BIT(1)
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#define N64_CONTROLLER_ID 0x0500
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#define MAX_CONTROLLERS 4
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static const char *n64joy_phys[MAX_CONTROLLERS] = {
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"n64joy/port0",
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"n64joy/port1",
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"n64joy/port2",
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"n64joy/port3",
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};
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struct n64joy_priv {
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u64 si_buf[8] ____cacheline_aligned;
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struct timer_list timer;
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struct mutex n64joy_mutex;
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struct input_dev *n64joy_dev[MAX_CONTROLLERS];
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u32 __iomem *reg_base;
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u8 n64joy_opened;
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};
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struct joydata {
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unsigned int: 16; /* unused */
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unsigned int err: 2;
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unsigned int: 14; /* unused */
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union {
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u32 data;
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struct {
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unsigned int a: 1;
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unsigned int b: 1;
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unsigned int z: 1;
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unsigned int start: 1;
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unsigned int up: 1;
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unsigned int down: 1;
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unsigned int left: 1;
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unsigned int right: 1;
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unsigned int: 2; /* unused */
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unsigned int l: 1;
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unsigned int r: 1;
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unsigned int c_up: 1;
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unsigned int c_down: 1;
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unsigned int c_left: 1;
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unsigned int c_right: 1;
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signed int x: 8;
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signed int y: 8;
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};
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};
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};
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static void n64joy_write_reg(u32 __iomem *reg_base, const u8 reg, const u32 value)
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{
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writel(value, reg_base + reg);
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}
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static u32 n64joy_read_reg(u32 __iomem *reg_base, const u8 reg)
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{
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return readl(reg_base + reg);
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}
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static void n64joy_wait_si_dma(u32 __iomem *reg_base)
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{
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while (n64joy_read_reg(reg_base, SI_STATUS_REG) &
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(SI_STATUS_DMA_BUSY | SI_STATUS_IO_BUSY))
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cpu_relax();
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}
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static void n64joy_exec_pif(struct n64joy_priv *priv, const u64 in[8])
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{
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unsigned long flags;
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dma_cache_wback_inv((unsigned long) in, 8 * 8);
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dma_cache_inv((unsigned long) priv->si_buf, 8 * 8);
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local_irq_save(flags);
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n64joy_wait_si_dma(priv->reg_base);
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barrier();
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n64joy_write_reg(priv->reg_base, SI_DRAM_REG, virt_to_phys(in));
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barrier();
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n64joy_write_reg(priv->reg_base, SI_WRITE_REG, PIF_RAM);
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barrier();
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n64joy_wait_si_dma(priv->reg_base);
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barrier();
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n64joy_write_reg(priv->reg_base, SI_DRAM_REG, virt_to_phys(priv->si_buf));
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barrier();
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n64joy_write_reg(priv->reg_base, SI_READ_REG, PIF_RAM);
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barrier();
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n64joy_wait_si_dma(priv->reg_base);
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local_irq_restore(flags);
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}
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static const u64 polldata[] ____cacheline_aligned = {
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0xff010401ffffffff,
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0xff010401ffffffff,
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0xff010401ffffffff,
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0xff010401ffffffff,
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0xfe00000000000000,
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0,
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0,
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1
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};
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static void n64joy_poll(struct timer_list *t)
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{
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const struct joydata *data;
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struct n64joy_priv *priv = container_of(t, struct n64joy_priv, timer);
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struct input_dev *dev;
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u32 i;
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n64joy_exec_pif(priv, polldata);
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data = (struct joydata *) priv->si_buf;
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for (i = 0; i < MAX_CONTROLLERS; i++) {
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if (!priv->n64joy_dev[i])
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continue;
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dev = priv->n64joy_dev[i];
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/* d-pad */
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input_report_key(dev, BTN_DPAD_UP, data[i].up);
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input_report_key(dev, BTN_DPAD_DOWN, data[i].down);
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input_report_key(dev, BTN_DPAD_LEFT, data[i].left);
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input_report_key(dev, BTN_DPAD_RIGHT, data[i].right);
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/* c buttons */
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input_report_key(dev, BTN_FORWARD, data[i].c_up);
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input_report_key(dev, BTN_BACK, data[i].c_down);
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input_report_key(dev, BTN_LEFT, data[i].c_left);
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input_report_key(dev, BTN_RIGHT, data[i].c_right);
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/* matching buttons */
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input_report_key(dev, BTN_START, data[i].start);
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input_report_key(dev, BTN_Z, data[i].z);
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/* remaining ones: a, b, l, r */
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input_report_key(dev, BTN_0, data[i].a);
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input_report_key(dev, BTN_1, data[i].b);
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input_report_key(dev, BTN_2, data[i].l);
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input_report_key(dev, BTN_3, data[i].r);
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input_report_abs(dev, ABS_X, data[i].x);
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input_report_abs(dev, ABS_Y, data[i].y);
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input_sync(dev);
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}
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mod_timer(&priv->timer, jiffies + msecs_to_jiffies(16));
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}
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static int n64joy_open(struct input_dev *dev)
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{
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struct n64joy_priv *priv = input_get_drvdata(dev);
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int err;
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err = mutex_lock_interruptible(&priv->n64joy_mutex);
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if (err)
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return err;
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if (!priv->n64joy_opened) {
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/*
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* We could use the vblank irq, but it's not important if
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* the poll point slightly changes.
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*/
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timer_setup(&priv->timer, n64joy_poll, 0);
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mod_timer(&priv->timer, jiffies + msecs_to_jiffies(16));
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}
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priv->n64joy_opened++;
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mutex_unlock(&priv->n64joy_mutex);
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return err;
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}
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static void n64joy_close(struct input_dev *dev)
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{
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struct n64joy_priv *priv = input_get_drvdata(dev);
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mutex_lock(&priv->n64joy_mutex);
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if (!--priv->n64joy_opened)
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del_timer_sync(&priv->timer);
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mutex_unlock(&priv->n64joy_mutex);
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}
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static const u64 __initconst scandata[] ____cacheline_aligned = {
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0xff010300ffffffff,
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0xff010300ffffffff,
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0xff010300ffffffff,
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0xff010300ffffffff,
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0xfe00000000000000,
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0,
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0,
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1
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};
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/*
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* The target device is embedded and RAM-constrained. We save RAM
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* by initializing in __init code that gets dropped late in boot.
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* For the same reason there is no module or unloading support.
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*/
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static int __init n64joy_probe(struct platform_device *pdev)
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{
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const struct joydata *data;
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struct n64joy_priv *priv;
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struct input_dev *dev;
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int err = 0;
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u32 i, j, found = 0;
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priv = kzalloc(sizeof(struct n64joy_priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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mutex_init(&priv->n64joy_mutex);
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priv->reg_base = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(priv->reg_base)) {
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err = PTR_ERR(priv->reg_base);
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goto fail;
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}
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/* The controllers are not hotpluggable, so we can scan in init */
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n64joy_exec_pif(priv, scandata);
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data = (struct joydata *) priv->si_buf;
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for (i = 0; i < MAX_CONTROLLERS; i++) {
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if (!data[i].err && data[i].data >> 16 == N64_CONTROLLER_ID) {
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found++;
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dev = priv->n64joy_dev[i] = input_allocate_device();
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if (!priv->n64joy_dev[i]) {
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err = -ENOMEM;
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goto fail;
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}
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input_set_drvdata(dev, priv);
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dev->name = "N64 controller";
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dev->phys = n64joy_phys[i];
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dev->id.bustype = BUS_HOST;
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dev->id.vendor = 0;
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dev->id.product = data[i].data >> 16;
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dev->id.version = 0;
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dev->dev.parent = &pdev->dev;
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dev->open = n64joy_open;
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dev->close = n64joy_close;
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/* d-pad */
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input_set_capability(dev, EV_KEY, BTN_DPAD_UP);
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input_set_capability(dev, EV_KEY, BTN_DPAD_DOWN);
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input_set_capability(dev, EV_KEY, BTN_DPAD_LEFT);
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input_set_capability(dev, EV_KEY, BTN_DPAD_RIGHT);
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/* c buttons */
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input_set_capability(dev, EV_KEY, BTN_LEFT);
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input_set_capability(dev, EV_KEY, BTN_RIGHT);
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input_set_capability(dev, EV_KEY, BTN_FORWARD);
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input_set_capability(dev, EV_KEY, BTN_BACK);
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/* matching buttons */
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input_set_capability(dev, EV_KEY, BTN_START);
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input_set_capability(dev, EV_KEY, BTN_Z);
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/* remaining ones: a, b, l, r */
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input_set_capability(dev, EV_KEY, BTN_0);
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input_set_capability(dev, EV_KEY, BTN_1);
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input_set_capability(dev, EV_KEY, BTN_2);
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input_set_capability(dev, EV_KEY, BTN_3);
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for (j = 0; j < 2; j++)
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input_set_abs_params(dev, ABS_X + j,
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S8_MIN, S8_MAX, 0, 0);
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err = input_register_device(dev);
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if (err) {
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input_free_device(dev);
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goto fail;
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}
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}
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}
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pr_info("%u controller(s) connected\n", found);
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if (!found)
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return -ENODEV;
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return 0;
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fail:
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for (i = 0; i < MAX_CONTROLLERS; i++) {
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if (!priv->n64joy_dev[i])
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continue;
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input_unregister_device(priv->n64joy_dev[i]);
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}
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return err;
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}
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static struct platform_driver n64joy_driver = {
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.driver = {
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.name = "n64joy",
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},
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};
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static int __init n64joy_init(void)
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{
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return platform_driver_probe(&n64joy_driver, n64joy_probe);
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}
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module_init(n64joy_init);
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