[PATCH 6/6] Input: add IOC3 serio driver

[Thomas Bogendoerfer]

This patch adds a platform driver for supporting keyboard and mouse
interface of SGI IOC3 chips.

Signed-off-by: Thomas Bogendoerfer <tbogendoerfer@xxxxxxx>
---
 drivers/input/serio/Kconfig   |  12 +++
 drivers/input/serio/Makefile  |   1 +
 drivers/input/serio/ioc3kbd.c | 183 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 196 insertions(+)
 create mode 100644 drivers/input/serio/ioc3kbd.c

diff --git a/drivers/input/serio/Kconfig b/drivers/input/serio/Kconfig
index c9c7224d5ae0..ceb89d8b785d 100644
--- a/drivers/input/serio/Kconfig
+++ b/drivers/input/serio/Kconfig
@@ -164,6 +164,18 @@ config SERIO_MACEPS2
 	  To compile this driver as a module, choose M here: the
 	  module will be called maceps2.
 
+config SERIO_SGI_IOC3
+	tristate "SGI IOC3 PS/2 controller"
+	depends on SGI_MFD_IOC3
+	help
+	  Say Y here if you have an SGI Onyx2, SGI Octane or IOC3 PCI card
+	  and you want to attach and use a keyboard, mouse, or both.
+
+	  Do not use on an SGI Origin 2000, as the IO6 board in those
+	  systems lacks the necessary PS/2 ports.  You will need to add
+	  an IOC3 PCI card (CADduo) via a PCI Shoehorn XIO card or the
+	  PCI Cardcage (shoebox) first.
+
 config SERIO_LIBPS2
 	tristate "PS/2 driver library"
 	depends on SERIO_I8042 || SERIO_I8042=n
diff --git a/drivers/input/serio/Makefile b/drivers/input/serio/Makefile
index 67950a5ccb3f..6d97bad7b844 100644
--- a/drivers/input/serio/Makefile
+++ b/drivers/input/serio/Makefile
@@ -20,6 +20,7 @@ obj-$(CONFIG_HIL_MLC)		+= hp_sdc_mlc.o hil_mlc.o
 obj-$(CONFIG_SERIO_PCIPS2)	+= pcips2.o
 obj-$(CONFIG_SERIO_PS2MULT)	+= ps2mult.o
 obj-$(CONFIG_SERIO_MACEPS2)	+= maceps2.o
+obj-$(CONFIG_SERIO_SGI_IOC3)	+= ioc3kbd.o
 obj-$(CONFIG_SERIO_LIBPS2)	+= libps2.o
 obj-$(CONFIG_SERIO_RAW)		+= serio_raw.o
 obj-$(CONFIG_SERIO_AMS_DELTA)	+= ams_delta_serio.o
diff --git a/drivers/input/serio/ioc3kbd.c b/drivers/input/serio/ioc3kbd.c
new file mode 100644
index 000000000000..8ff46a9f3d98
--- /dev/null
+++ b/drivers/input/serio/ioc3kbd.c
@@ -0,0 +1,183 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * SGI IOC3 PS/2 controller driver for linux
+ *
+ * Copyright (C) 2019 Thomas Bogendoerfer <tbogendoerfer@xxxxxxx>
+ *
+ * Based on code Copyright (C) 2005 Stanislaw Skowronek <skylark@xxxxxxxxxxxxx>
+ *               Copyright (C) 2009 Johannes Dickgreber <tanzy@xxxxxx>
+ */
+
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/serio.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+#include <asm/sn/ioc3.h>
+
+struct ioc3kbd_data {
+	struct ioc3_serioregs __iomem *regs;
+	struct serio *kbd, *aux;
+};
+
+static int ioc3kbd_write(struct serio *dev, u8 val)
+{
+	struct ioc3kbd_data *d = (struct ioc3kbd_data *)(dev->port_data);
+	unsigned long timeout = 0;
+	u32 mask;
+
+	mask = (dev == d->aux) ? KM_CSR_M_WRT_PEND : KM_CSR_K_WRT_PEND;
+	while ((readl(&d->regs->km_csr) & mask) && (timeout < 1000)) {
+		udelay(100);
+		timeout++;
+	}
+
+	if (dev == d->aux)
+		writel(((u32)val) & 0x000000ff, &d->regs->m_wd);
+	else
+		writel(((u32)val) & 0x000000ff, &d->regs->k_wd);
+
+	if (timeout >= 1000)
+		return -1;
+	return 0;
+}
+
+static irqreturn_t ioc3kbd_intr(int itq, void *dev_id)
+{
+	struct ioc3kbd_data *d = dev_id;
+	u32 data_k, data_m;
+
+	data_k = readl(&d->regs->k_rd);
+	data_m = readl(&d->regs->m_rd);
+
+	if (data_k & KM_RD_VALID_0)
+		serio_interrupt(d->kbd,
+		(data_k >> KM_RD_DATA_0_SHIFT) & 0xff, 0);
+	if (data_k & KM_RD_VALID_1)
+		serio_interrupt(d->kbd,
+		(data_k >> KM_RD_DATA_1_SHIFT) & 0xff, 0);
+	if (data_k & KM_RD_VALID_2)
+		serio_interrupt(d->kbd,
+		(data_k >> KM_RD_DATA_2_SHIFT) & 0xff, 0);
+	if (data_m & KM_RD_VALID_0)
+		serio_interrupt(d->aux,
+		(data_m >> KM_RD_DATA_0_SHIFT) & 0xff, 0);
+	if (data_m & KM_RD_VALID_1)
+		serio_interrupt(d->aux,
+		(data_m >> KM_RD_DATA_1_SHIFT) & 0xff, 0);
+	if (data_m & KM_RD_VALID_2)
+		serio_interrupt(d->aux,
+		(data_m >> KM_RD_DATA_2_SHIFT) & 0xff, 0);
+
+	return 0;
+}
+
+static int ioc3kbd_open(struct serio *dev)
+{
+	return 0;
+}
+
+static void ioc3kbd_close(struct serio *dev)
+{
+	/* Empty */
+}
+
+static struct ioc3kbd_data *ioc3kbd_alloc_port(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct ioc3_serioregs __iomem *regs;
+	struct ioc3kbd_data *d;
+	struct serio *sk, *sa;
+	struct resource *mem;
+	int irq;
+
+	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!mem)
+		return NULL;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0)
+		return NULL;
+
+	regs = devm_ioremap(&pdev->dev, mem->start, resource_size(mem));
+	if (!regs)
+		return NULL;
+
+	sk = devm_kzalloc(dev, sizeof(struct serio), GFP_KERNEL);
+	if (!sk)
+		return NULL;
+
+	sa = devm_kzalloc(dev, sizeof(struct serio), GFP_KERNEL);
+	if (!sa)
+		return NULL;
+
+	d = devm_kzalloc(dev, sizeof(struct ioc3kbd_data),
+			 GFP_KERNEL);
+	if (!d)
+		return NULL;
+
+	if (request_irq(irq, ioc3kbd_intr, IRQF_SHARED, "ioc3-kbd", d))
+		return NULL;
+
+	sk->id.type = SERIO_8042;
+	sk->write = ioc3kbd_write;
+	sk->open = ioc3kbd_open;
+	sk->close = ioc3kbd_close;
+	snprintf(sk->name, sizeof(sk->name), "IOC3 keyboard %d", pdev->id);
+	snprintf(sk->phys, sizeof(sk->phys), "ioc3/serio%dkbd", pdev->id);
+	sk->port_data = d;
+	sk->dev.parent = &pdev->dev;
+
+	sa->id.type = SERIO_8042;
+	sa->write = ioc3kbd_write;
+	sa->open = ioc3kbd_open;
+	sa->close = ioc3kbd_close;
+	snprintf(sa->name, sizeof(sa->name), "IOC3 auxiliary %d", pdev->id);
+	snprintf(sa->phys, sizeof(sa->phys), "ioc3/serio%daux", pdev->id);
+	sa->port_data = d;
+	sa->dev.parent = dev;
+
+	d->regs = regs;
+	d->kbd = sk;
+	d->aux = sa;
+	return d;
+}
+
+static int ioc3kbd_probe(struct platform_device *pdev)
+{
+	struct ioc3kbd_data *d;
+
+	d = ioc3kbd_alloc_port(pdev);
+	if (!d)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, d);
+	serio_register_port(d->kbd);
+	serio_register_port(d->aux);
+
+	return 0;
+}
+
+static int ioc3kbd_remove(struct platform_device *pdev)
+{
+	struct ioc3kbd_data *d = platform_get_drvdata(pdev);
+
+	serio_unregister_port(d->kbd);
+	serio_unregister_port(d->aux);
+	return 0;
+}
+
+static struct platform_driver ioc3kbd_driver = {
+	.probe          = ioc3kbd_probe,
+	.remove         = ioc3kbd_remove,
+	.driver = {
+		.name = "ioc3-kbd",
+	},
+};
+module_platform_driver(ioc3kbd_driver);
+
+MODULE_AUTHOR("Stanislaw Skowronek <skylark@xxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("SGI IOC3 serio driver");
+MODULE_LICENSE("GPL");
-- 
2.13.7