Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 570 insertions, 0 deletions

diff --git a/arch/m68k/atari/atakeyb.c b/arch/m68k/atari/atakeyb.c
new file mode 100644
index 0000000000..5e0e682f9c
--- /dev/null
+++ b/arch/m68k/atari/atakeyb.c
@@ -0,0 +1,570 @@
+/*
+ * Atari Keyboard driver for 680x0 Linux
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file COPYING in the main directory of this archive
+ * for more details.
+ */
+
+/*
+ * Atari support by Robert de Vries
+ * enhanced by Bjoern Brauel and Roman Hodek
+ *
+ * 2.6 and input cleanup (removed autorepeat stuff) for 2.6.21
+ * 06/07 Michael Schmitz
+ */
+
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/errno.h>
+#include <linux/keyboard.h>
+#include <linux/delay.h>
+#include <linux/timer.h>
+#include <linux/kd.h>
+#include <linux/random.h>
+#include <linux/init.h>
+#include <linux/kbd_kern.h>
+
+#include <asm/atariints.h>
+#include <asm/atarihw.h>
+#include <asm/atarikb.h>
+#include <asm/atari_joystick.h>
+#include <asm/irq.h>
+
+
+/* Hook for MIDI serial driver */
+void (*atari_MIDI_interrupt_hook) (void);
+/* Hook for keyboard inputdev  driver */
+void (*atari_input_keyboard_interrupt_hook) (unsigned char, char);
+/* Hook for mouse inputdev  driver */
+void (*atari_input_mouse_interrupt_hook) (char *);
+EXPORT_SYMBOL(atari_input_keyboard_interrupt_hook);
+EXPORT_SYMBOL(atari_input_mouse_interrupt_hook);
+
+/* variables for IKBD self test: */
+
+/* state: 0: off; >0: in progress; >1: 0xf1 received */
+static volatile int ikbd_self_test;
+/* timestamp when last received a char */
+static volatile unsigned long self_test_last_rcv;
+/* bitmap of keys reported as broken */
+static unsigned long broken_keys[128/(sizeof(unsigned long)*8)] = { 0, };
+
+#define BREAK_MASK	(0x80)
+
+/*
+ * ++roman: The following changes were applied manually:
+ *
+ *  - The Alt (= Meta) key works in combination with Shift and
+ *    Control, e.g. Alt+Shift+a sends Meta-A (0xc1), Alt+Control+A sends
+ *    Meta-Ctrl-A (0x81) ...
+ *
+ *  - The parentheses on the keypad send '(' and ')' with all
+ *    modifiers (as would do e.g. keypad '+'), but they cannot be used as
+ *    application keys (i.e. sending Esc O c).
+ *
+ *  - HELP and UNDO are mapped to be F21 and F24, resp, that send the
+ *    codes "\E[M" and "\E[P". (This is better than the old mapping to
+ *    F11 and F12, because these codes are on Shift+F1/2 anyway.) This
+ *    way, applications that allow their own keyboard mappings
+ *    (e.g. tcsh, X Windows) can be configured to use them in the way
+ *    the label suggests (providing help or undoing).
+ *
+ *  - Console switching is done with Alt+Fx (consoles 1..10) and
+ *    Shift+Alt+Fx (consoles 11..20).
+ *
+ *  - The misc. special function implemented in the kernel are mapped
+ *    to the following key combinations:
+ *
+ *      ClrHome          -> Home/Find
+ *      Shift + ClrHome  -> End/Select
+ *      Shift + Up       -> Page Up
+ *      Shift + Down     -> Page Down
+ *      Alt + Help       -> show system status
+ *      Shift + Help     -> show memory info
+ *      Ctrl + Help      -> show registers
+ *      Ctrl + Alt + Del -> Reboot
+ *      Alt + Undo       -> switch to last console
+ *      Shift + Undo     -> send interrupt
+ *      Alt + Insert     -> stop/start output (same as ^S/^Q)
+ *      Alt + Up         -> Scroll back console (if implemented)
+ *      Alt + Down       -> Scroll forward console (if implemented)
+ *      Alt + CapsLock   -> NumLock
+ *
+ * ++Andreas:
+ *
+ *  - Help mapped to K_HELP
+ *  - Undo mapped to K_UNDO (= K_F246)
+ *  - Keypad Left/Right Parenthesis mapped to new K_PPAREN[LR]
+ */
+
+typedef enum kb_state_t {
+	KEYBOARD, AMOUSE, RMOUSE, JOYSTICK, CLOCK, RESYNC
+} KB_STATE_T;
+
+#define	IS_SYNC_CODE(sc)	((sc) >= 0x04 && (sc) <= 0xfb)
+
+typedef struct keyboard_state {
+	unsigned char buf[6];
+	int len;
+	KB_STATE_T state;
+} KEYBOARD_STATE;
+
+KEYBOARD_STATE kb_state;
+
+/* ++roman: If a keyboard overrun happened, we can't tell in general how much
+ * bytes have been lost and in which state of the packet structure we are now.
+ * This usually causes keyboards bytes to be interpreted as mouse movements
+ * and vice versa, which is very annoying. It seems better to throw away some
+ * bytes (that are usually mouse bytes) than to misinterpret them. Therefore I
+ * introduced the RESYNC state for IKBD data. In this state, the bytes up to
+ * one that really looks like a key event (0x04..0xf2) or the start of a mouse
+ * packet (0xf8..0xfb) are thrown away, but at most 2 bytes. This at least
+ * speeds up the resynchronization of the event structure, even if maybe a
+ * mouse movement is lost. However, nothing is perfect. For bytes 0x01..0x03,
+ * it's really hard to decide whether they're mouse or keyboard bytes. Since
+ * overruns usually occur when moving the Atari mouse rapidly, they're seen as
+ * mouse bytes here. If this is wrong, only a make code of the keyboard gets
+ * lost, which isn't too bad. Losing a break code would be disastrous,
+ * because then the keyboard repeat strikes...
+ */
+
+static irqreturn_t atari_keyboard_interrupt(int irq, void *dummy)
+{
+	u_char acia_stat;
+	int scancode;
+	int break_flag;
+
+repeat:
+	if (acia.mid_ctrl & ACIA_IRQ)
+		if (atari_MIDI_interrupt_hook)
+			atari_MIDI_interrupt_hook();
+	acia_stat = acia.key_ctrl;
+	/* check out if the interrupt came from this ACIA */
+	if (!((acia_stat | acia.mid_ctrl) & ACIA_IRQ))
+		return IRQ_HANDLED;
+
+	if (acia_stat & ACIA_OVRN) {
+		/* a very fast typist or a slow system, give a warning */
+		/* ...happens often if interrupts were disabled for too long */
+		pr_debug("Keyboard overrun\n");
+		scancode = acia.key_data;
+		if (ikbd_self_test)
+			/* During self test, don't do resyncing, just process the code */
+			goto interpret_scancode;
+		else if (IS_SYNC_CODE(scancode)) {
+			/* This code seem already to be the start of a new packet or a
+			 * single scancode */
+			kb_state.state = KEYBOARD;
+			goto interpret_scancode;
+		} else {
+			/* Go to RESYNC state and skip this byte */
+			kb_state.state = RESYNC;
+			kb_state.len = 1;	/* skip max. 1 another byte */
+			goto repeat;
+		}
+	}
+
+	if (acia_stat & ACIA_RDRF) {
+		/* received a character */
+		scancode = acia.key_data;	/* get it or reset the ACIA, I'll get it! */
+	interpret_scancode:
+		switch (kb_state.state) {
+		case KEYBOARD:
+			switch (scancode) {
+			case 0xF7:
+				kb_state.state = AMOUSE;
+				kb_state.len = 0;
+				break;
+
+			case 0xF8:
+			case 0xF9:
+			case 0xFA:
+			case 0xFB:
+				kb_state.state = RMOUSE;
+				kb_state.len = 1;
+				kb_state.buf[0] = scancode;
+				break;
+
+			case 0xFC:
+				kb_state.state = CLOCK;
+				kb_state.len = 0;
+				break;
+
+			case 0xFE:
+			case 0xFF:
+				kb_state.state = JOYSTICK;
+				kb_state.len = 1;
+				kb_state.buf[0] = scancode;
+				break;
+
+			case 0xF1:
+				/* during self-test, note that 0xf1 received */
+				if (ikbd_self_test) {
+					++ikbd_self_test;
+					self_test_last_rcv = jiffies;
+					break;
+				}
+				fallthrough;
+
+			default:
+				break_flag = scancode & BREAK_MASK;
+				scancode &= ~BREAK_MASK;
+				if (ikbd_self_test) {
+					/* Scancodes sent during the self-test stand for broken
+					 * keys (keys being down). The code *should* be a break
+					 * code, but nevertheless some AT keyboard interfaces send
+					 * make codes instead. Therefore, simply ignore
+					 * break_flag...
+					 */
+					int keyval, keytyp;
+
+					set_bit(scancode, broken_keys);
+					self_test_last_rcv = jiffies;
+					/* new Linux scancodes; approx. */
+					keyval = scancode;
+					keytyp = KTYP(keyval) - 0xf0;
+					keyval = KVAL(keyval);
+
+					pr_warn("Key with scancode %d ", scancode);
+					if (keytyp == KT_LATIN || keytyp == KT_LETTER) {
+						if (keyval < ' ')
+							pr_cont("('^%c') ", keyval + '@');
+						else
+							pr_cont("('%c') ", keyval);
+					}
+					pr_cont("is broken -- will be ignored.\n");
+					break;
+				} else if (test_bit(scancode, broken_keys))
+					break;
+
+				if (atari_input_keyboard_interrupt_hook)
+					atari_input_keyboard_interrupt_hook((unsigned char)scancode, !break_flag);
+				break;
+			}
+			break;
+
+		case AMOUSE:
+			kb_state.buf[kb_state.len++] = scancode;
+			if (kb_state.len == 5) {
+				kb_state.state = KEYBOARD;
+				/* not yet used */
+				/* wake up someone waiting for this */
+			}
+			break;
+
+		case RMOUSE:
+			kb_state.buf[kb_state.len++] = scancode;
+			if (kb_state.len == 3) {
+				kb_state.state = KEYBOARD;
+				if (atari_input_mouse_interrupt_hook)
+					atari_input_mouse_interrupt_hook(kb_state.buf);
+			}
+			break;
+
+		case JOYSTICK:
+			kb_state.buf[1] = scancode;
+			kb_state.state = KEYBOARD;
+#ifdef FIXED_ATARI_JOYSTICK
+			atari_joystick_interrupt(kb_state.buf);
+#endif
+			break;
+
+		case CLOCK:
+			kb_state.buf[kb_state.len++] = scancode;
+			if (kb_state.len == 6) {
+				kb_state.state = KEYBOARD;
+				/* wake up someone waiting for this.
+				   But will this ever be used, as Linux keeps its own time.
+				   Perhaps for synchronization purposes? */
+				/* wake_up_interruptible(&clock_wait); */
+			}
+			break;
+
+		case RESYNC:
+			if (kb_state.len <= 0 || IS_SYNC_CODE(scancode)) {
+				kb_state.state = KEYBOARD;
+				goto interpret_scancode;
+			}
+			kb_state.len--;
+			break;
+		}
+	}
+
+#if 0
+	if (acia_stat & ACIA_CTS)
+		/* cannot happen */;
+#endif
+
+	if (acia_stat & (ACIA_FE | ACIA_PE)) {
+		pr_err("Error in keyboard communication\n");
+	}
+
+	/* handle_scancode() can take a lot of time, so check again if
+	 * some character arrived
+	 */
+	goto repeat;
+}
+
+/*
+ * I write to the keyboard without using interrupts, I poll instead.
+ * This takes for the maximum length string allowed (7) at 7812.5 baud
+ * 8 data 1 start 1 stop bit: 9.0 ms
+ * If this takes too long for normal operation, interrupt driven writing
+ * is the solution. (I made a feeble attempt in that direction but I
+ * kept it simple for now.)
+ */
+void ikbd_write(const char *str, int len)
+{
+	u_char acia_stat;
+
+	if ((len < 1) || (len > 7))
+		panic("ikbd: maximum string length exceeded");
+	while (len) {
+		acia_stat = acia.key_ctrl;
+		if (acia_stat & ACIA_TDRE) {
+			acia.key_data = *str++;
+			len--;
+		}
+	}
+}
+
+/* Reset (without touching the clock) */
+void ikbd_reset(void)
+{
+	static const char cmd[2] = { 0x80, 0x01 };
+
+	ikbd_write(cmd, 2);
+
+	/*
+	 * if all's well code 0xF1 is returned, else the break codes of
+	 * all keys making contact
+	 */
+}
+
+/* Set mouse button action */
+void ikbd_mouse_button_action(int mode)
+{
+	char cmd[2] = { 0x07, mode };
+
+	ikbd_write(cmd, 2);
+}
+
+/* Set relative mouse position reporting */
+void ikbd_mouse_rel_pos(void)
+{
+	static const char cmd[1] = { 0x08 };
+
+	ikbd_write(cmd, 1);
+}
+EXPORT_SYMBOL(ikbd_mouse_rel_pos);
+
+/* Set absolute mouse position reporting */
+void ikbd_mouse_abs_pos(int xmax, int ymax)
+{
+	char cmd[5] = { 0x09, xmax>>8, xmax&0xFF, ymax>>8, ymax&0xFF };
+
+	ikbd_write(cmd, 5);
+}
+
+/* Set mouse keycode mode */
+void ikbd_mouse_kbd_mode(int dx, int dy)
+{
+	char cmd[3] = { 0x0A, dx, dy };
+
+	ikbd_write(cmd, 3);
+}
+
+/* Set mouse threshold */
+void ikbd_mouse_thresh(int x, int y)
+{
+	char cmd[3] = { 0x0B, x, y };
+
+	ikbd_write(cmd, 3);
+}
+EXPORT_SYMBOL(ikbd_mouse_thresh);
+
+/* Set mouse scale */
+void ikbd_mouse_scale(int x, int y)
+{
+	char cmd[3] = { 0x0C, x, y };
+
+	ikbd_write(cmd, 3);
+}
+
+/* Interrogate mouse position */
+void ikbd_mouse_pos_get(int *x, int *y)
+{
+	static const char cmd[1] = { 0x0D };
+
+	ikbd_write(cmd, 1);
+
+	/* wait for returning bytes */
+}
+
+/* Load mouse position */
+void ikbd_mouse_pos_set(int x, int y)
+{
+	char cmd[6] = { 0x0E, 0x00, x>>8, x&0xFF, y>>8, y&0xFF };
+
+	ikbd_write(cmd, 6);
+}
+
+/* Set Y=0 at bottom */
+void ikbd_mouse_y0_bot(void)
+{
+	static const char cmd[1] = { 0x0F };
+
+	ikbd_write(cmd, 1);
+}
+
+/* Set Y=0 at top */
+void ikbd_mouse_y0_top(void)
+{
+	static const char cmd[1] = { 0x10 };
+
+	ikbd_write(cmd, 1);
+}
+EXPORT_SYMBOL(ikbd_mouse_y0_top);
+
+/* Disable mouse */
+void ikbd_mouse_disable(void)
+{
+	static const char cmd[1] = { 0x12 };
+
+	ikbd_write(cmd, 1);
+}
+EXPORT_SYMBOL(ikbd_mouse_disable);
+
+/* Set joystick event reporting */
+void ikbd_joystick_event_on(void)
+{
+	static const char cmd[1] = { 0x14 };
+
+	ikbd_write(cmd, 1);
+}
+
+/* Set joystick interrogation mode */
+void ikbd_joystick_event_off(void)
+{
+	static const char cmd[1] = { 0x15 };
+
+	ikbd_write(cmd, 1);
+}
+
+/* Joystick interrogation */
+void ikbd_joystick_get_state(void)
+{
+	static const char cmd[1] = { 0x16 };
+
+	ikbd_write(cmd, 1);
+}
+
+#if 0
+/* This disables all other ikbd activities !!!! */
+/* Set joystick monitoring */
+void ikbd_joystick_monitor(int rate)
+{
+	static const char cmd[2] = { 0x17, rate };
+
+	ikbd_write(cmd, 2);
+
+	kb_state.state = JOYSTICK_MONITOR;
+}
+#endif
+
+/* some joystick routines not in yet (0x18-0x19) */
+
+/* Disable joysticks */
+void ikbd_joystick_disable(void)
+{
+	static const char cmd[1] = { 0x1A };
+
+	ikbd_write(cmd, 1);
+}
+
+/*
+ * The original code sometimes left the interrupt line of
+ * the ACIAs low forever. I hope, it is fixed now.
+ *
+ * Martin Rogge, 20 Aug 1995
+ */
+
+static int atari_keyb_done = 0;
+
+int atari_keyb_init(void)
+{
+	int error;
+
+	if (atari_keyb_done)
+		return 0;
+
+	kb_state.state = KEYBOARD;
+	kb_state.len = 0;
+
+	error = request_irq(IRQ_MFP_ACIA, atari_keyboard_interrupt, 0,
+			    "keyboard,mouse,MIDI", atari_keyboard_interrupt);
+	if (error)
+		return error;
+
+	atari_turnoff_irq(IRQ_MFP_ACIA);
+	do {
+		/* reset IKBD ACIA */
+		acia.key_ctrl = ACIA_RESET |
+				((atari_switches & ATARI_SWITCH_IKBD) ?
+				 ACIA_RHTID : 0);
+		(void)acia.key_ctrl;
+		(void)acia.key_data;
+
+		/* reset MIDI ACIA */
+		acia.mid_ctrl = ACIA_RESET |
+				((atari_switches & ATARI_SWITCH_MIDI) ?
+				 ACIA_RHTID : 0);
+		(void)acia.mid_ctrl;
+		(void)acia.mid_data;
+
+		/* divide 500kHz by 64 gives 7812.5 baud */
+		/* 8 data no parity 1 start 1 stop bit */
+		/* receive interrupt enabled */
+		/* RTS low (except if switch selected), transmit interrupt disabled */
+		acia.key_ctrl = (ACIA_DIV64|ACIA_D8N1S|ACIA_RIE) |
+				((atari_switches & ATARI_SWITCH_IKBD) ?
+				 ACIA_RHTID : ACIA_RLTID);
+
+		acia.mid_ctrl = ACIA_DIV16 | ACIA_D8N1S |
+				((atari_switches & ATARI_SWITCH_MIDI) ?
+				 ACIA_RHTID : 0);
+
+	/* make sure the interrupt line is up */
+	} while ((st_mfp.par_dt_reg & 0x10) == 0);
+
+	/* enable ACIA Interrupts */
+	st_mfp.active_edge &= ~0x10;
+	atari_turnon_irq(IRQ_MFP_ACIA);
+
+	ikbd_self_test = 1;
+	ikbd_reset();
+	/* wait for a period of inactivity (here: 0.25s), then assume the IKBD's
+	 * self-test is finished */
+	self_test_last_rcv = jiffies;
+	while (time_before(jiffies, self_test_last_rcv + HZ/4))
+		barrier();
+	/* if not incremented: no 0xf1 received */
+	if (ikbd_self_test == 1)
+		pr_err("Keyboard self test failed!\n");
+	ikbd_self_test = 0;
+
+	ikbd_mouse_disable();
+	ikbd_joystick_disable();
+
+#ifdef FIXED_ATARI_JOYSTICK
+	atari_joystick_init();
+#endif
+
+	// flag init done
+	atari_keyb_done = 1;
+	return 0;
+}
+EXPORT_SYMBOL_GPL(atari_keyb_init);