Adding upstream version 6.1.76.upstream/6.1.76

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

1 files changed, 665 insertions, 0 deletions

diff --git a/arch/m68k/mac/misc.c b/arch/m68k/mac/misc.c
new file mode 100644
index 000000000..4fab34791
--- /dev/null
+++ b/arch/m68k/mac/misc.c
@@ -0,0 +1,665 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Miscellaneous Mac68K-specific stuff
+ */
+
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/sched.h>
+#include <linux/time.h>
+#include <linux/rtc.h>
+#include <linux/mm.h>
+
+#include <linux/adb.h>
+#include <linux/cuda.h>
+#include <linux/pmu.h>
+
+#include <linux/uaccess.h>
+#include <asm/io.h>
+#include <asm/setup.h>
+#include <asm/macintosh.h>
+#include <asm/mac_via.h>
+#include <asm/mac_oss.h>
+
+#include <asm/machdep.h>
+
+/*
+ * Offset between Unix time (1970-based) and Mac time (1904-based). Cuda and PMU
+ * times wrap in 2040. If we need to handle later times, the read_time functions
+ * need to be changed to interpret wrapped times as post-2040.
+ */
+
+#define RTC_OFFSET 2082844800
+
+static void (*rom_reset)(void);
+
+#if IS_ENABLED(CONFIG_NVRAM)
+#ifdef CONFIG_ADB_CUDA
+static unsigned char cuda_pram_read_byte(int offset)
+{
+	struct adb_request req;
+
+	if (cuda_request(&req, NULL, 4, CUDA_PACKET, CUDA_GET_PRAM,
+			 (offset >> 8) & 0xFF, offset & 0xFF) < 0)
+		return 0;
+	while (!req.complete)
+		cuda_poll();
+	return req.reply[3];
+}
+
+static void cuda_pram_write_byte(unsigned char data, int offset)
+{
+	struct adb_request req;
+
+	if (cuda_request(&req, NULL, 5, CUDA_PACKET, CUDA_SET_PRAM,
+			 (offset >> 8) & 0xFF, offset & 0xFF, data) < 0)
+		return;
+	while (!req.complete)
+		cuda_poll();
+}
+#endif /* CONFIG_ADB_CUDA */
+
+#ifdef CONFIG_ADB_PMU
+static unsigned char pmu_pram_read_byte(int offset)
+{
+	struct adb_request req;
+
+	if (pmu_request(&req, NULL, 3, PMU_READ_XPRAM,
+	                offset & 0xFF, 1) < 0)
+		return 0;
+	pmu_wait_complete(&req);
+
+	return req.reply[0];
+}
+
+static void pmu_pram_write_byte(unsigned char data, int offset)
+{
+	struct adb_request req;
+
+	if (pmu_request(&req, NULL, 4, PMU_WRITE_XPRAM,
+	                offset & 0xFF, 1, data) < 0)
+		return;
+	pmu_wait_complete(&req);
+}
+#endif /* CONFIG_ADB_PMU */
+#endif /* CONFIG_NVRAM */
+
+/*
+ * VIA PRAM/RTC access routines
+ *
+ * Must be called with interrupts disabled and
+ * the RTC should be enabled.
+ */
+
+static __u8 via_rtc_recv(void)
+{
+	int i, reg;
+	__u8 data;
+
+	reg = via1[vBufB] & ~VIA1B_vRTCClk;
+
+	/* Set the RTC data line to be an input. */
+
+	via1[vDirB] &= ~VIA1B_vRTCData;
+
+	/* The bits of the byte come out in MSB order */
+
+	data = 0;
+	for (i = 0 ; i < 8 ; i++) {
+		via1[vBufB] = reg;
+		via1[vBufB] = reg | VIA1B_vRTCClk;
+		data = (data << 1) | (via1[vBufB] & VIA1B_vRTCData);
+	}
+
+	/* Return RTC data line to output state */
+
+	via1[vDirB] |= VIA1B_vRTCData;
+
+	return data;
+}
+
+static void via_rtc_send(__u8 data)
+{
+	int i, reg, bit;
+
+	reg = via1[vBufB] & ~(VIA1B_vRTCClk | VIA1B_vRTCData);
+
+	/* The bits of the byte go in in MSB order */
+
+	for (i = 0 ; i < 8 ; i++) {
+		bit = data & 0x80? 1 : 0;
+		data <<= 1;
+		via1[vBufB] = reg | bit;
+		via1[vBufB] = reg | bit | VIA1B_vRTCClk;
+	}
+}
+
+/*
+ * These values can be found in Inside Macintosh vol. III ch. 2
+ * which has a description of the RTC chip in the original Mac.
+ */
+
+#define RTC_FLG_READ            BIT(7)
+#define RTC_FLG_WRITE_PROTECT   BIT(7)
+#define RTC_CMD_READ(r)         (RTC_FLG_READ | (r << 2))
+#define RTC_CMD_WRITE(r)        (r << 2)
+#define RTC_REG_SECONDS_0       0
+#define RTC_REG_SECONDS_1       1
+#define RTC_REG_SECONDS_2       2
+#define RTC_REG_SECONDS_3       3
+#define RTC_REG_WRITE_PROTECT   13
+
+/*
+ * Inside Mac has no information about two-byte RTC commands but
+ * the MAME/MESS source code has the essentials.
+ */
+
+#define RTC_REG_XPRAM           14
+#define RTC_CMD_XPRAM_READ      (RTC_CMD_READ(RTC_REG_XPRAM) << 8)
+#define RTC_CMD_XPRAM_WRITE     (RTC_CMD_WRITE(RTC_REG_XPRAM) << 8)
+#define RTC_CMD_XPRAM_ARG(a)    (((a & 0xE0) << 3) | ((a & 0x1F) << 2))
+
+/*
+ * Execute a VIA PRAM/RTC command. For read commands
+ * data should point to a one-byte buffer for the
+ * resulting data. For write commands it should point
+ * to the data byte to for the command.
+ *
+ * This function disables all interrupts while running.
+ */
+
+static void via_rtc_command(int command, __u8 *data)
+{
+	unsigned long flags;
+	int is_read;
+
+	local_irq_save(flags);
+
+	/* The least significant bits must be 0b01 according to Inside Mac */
+
+	command = (command & ~3) | 1;
+
+	/* Enable the RTC and make sure the strobe line is high */
+
+	via1[vBufB] = (via1[vBufB] | VIA1B_vRTCClk) & ~VIA1B_vRTCEnb;
+
+	if (command & 0xFF00) {		/* extended (two-byte) command */
+		via_rtc_send((command & 0xFF00) >> 8);
+		via_rtc_send(command & 0xFF);
+		is_read = command & (RTC_FLG_READ << 8);
+	} else {			/* one-byte command */
+		via_rtc_send(command);
+		is_read = command & RTC_FLG_READ;
+	}
+	if (is_read) {
+		*data = via_rtc_recv();
+	} else {
+		via_rtc_send(*data);
+	}
+
+	/* All done, disable the RTC */
+
+	via1[vBufB] |= VIA1B_vRTCEnb;
+
+	local_irq_restore(flags);
+}
+
+#if IS_ENABLED(CONFIG_NVRAM)
+static unsigned char via_pram_read_byte(int offset)
+{
+	unsigned char temp;
+
+	via_rtc_command(RTC_CMD_XPRAM_READ | RTC_CMD_XPRAM_ARG(offset), &temp);
+
+	return temp;
+}
+
+static void via_pram_write_byte(unsigned char data, int offset)
+{
+	unsigned char temp;
+
+	temp = 0x55;
+	via_rtc_command(RTC_CMD_WRITE(RTC_REG_WRITE_PROTECT), &temp);
+
+	temp = data;
+	via_rtc_command(RTC_CMD_XPRAM_WRITE | RTC_CMD_XPRAM_ARG(offset), &temp);
+
+	temp = 0x55 | RTC_FLG_WRITE_PROTECT;
+	via_rtc_command(RTC_CMD_WRITE(RTC_REG_WRITE_PROTECT), &temp);
+}
+#endif /* CONFIG_NVRAM */
+
+/*
+ * Return the current time in seconds since January 1, 1904.
+ *
+ * This only works on machines with the VIA-based PRAM/RTC, which
+ * is basically any machine with Mac II-style ADB.
+ */
+
+static time64_t via_read_time(void)
+{
+	union {
+		__u8 cdata[4];
+		__u32 idata;
+	} result, last_result;
+	int count = 1;
+
+	via_rtc_command(RTC_CMD_READ(RTC_REG_SECONDS_0), &last_result.cdata[3]);
+	via_rtc_command(RTC_CMD_READ(RTC_REG_SECONDS_1), &last_result.cdata[2]);
+	via_rtc_command(RTC_CMD_READ(RTC_REG_SECONDS_2), &last_result.cdata[1]);
+	via_rtc_command(RTC_CMD_READ(RTC_REG_SECONDS_3), &last_result.cdata[0]);
+
+	/*
+	 * The NetBSD guys say to loop until you get the same reading
+	 * twice in a row.
+	 */
+
+	while (1) {
+		via_rtc_command(RTC_CMD_READ(RTC_REG_SECONDS_0),
+		                &result.cdata[3]);
+		via_rtc_command(RTC_CMD_READ(RTC_REG_SECONDS_1),
+		                &result.cdata[2]);
+		via_rtc_command(RTC_CMD_READ(RTC_REG_SECONDS_2),
+		                &result.cdata[1]);
+		via_rtc_command(RTC_CMD_READ(RTC_REG_SECONDS_3),
+		                &result.cdata[0]);
+
+		if (result.idata == last_result.idata)
+			return (time64_t)result.idata - RTC_OFFSET;
+
+		if (++count > 10)
+			break;
+
+		last_result.idata = result.idata;
+	}
+
+	pr_err("%s: failed to read a stable value; got 0x%08x then 0x%08x\n",
+	       __func__, last_result.idata, result.idata);
+
+	return 0;
+}
+
+/*
+ * Set the current time to a number of seconds since January 1, 1904.
+ *
+ * This only works on machines with the VIA-based PRAM/RTC, which
+ * is basically any machine with Mac II-style ADB.
+ */
+
+static void via_set_rtc_time(struct rtc_time *tm)
+{
+	union {
+		__u8 cdata[4];
+		__u32 idata;
+	} data;
+	__u8 temp;
+	time64_t time;
+
+	time = mktime64(tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
+	                tm->tm_hour, tm->tm_min, tm->tm_sec);
+
+	/* Clear the write protect bit */
+
+	temp = 0x55;
+	via_rtc_command(RTC_CMD_WRITE(RTC_REG_WRITE_PROTECT), &temp);
+
+	data.idata = lower_32_bits(time + RTC_OFFSET);
+	via_rtc_command(RTC_CMD_WRITE(RTC_REG_SECONDS_0), &data.cdata[3]);
+	via_rtc_command(RTC_CMD_WRITE(RTC_REG_SECONDS_1), &data.cdata[2]);
+	via_rtc_command(RTC_CMD_WRITE(RTC_REG_SECONDS_2), &data.cdata[1]);
+	via_rtc_command(RTC_CMD_WRITE(RTC_REG_SECONDS_3), &data.cdata[0]);
+
+	/* Set the write protect bit */
+
+	temp = 0x55 | RTC_FLG_WRITE_PROTECT;
+	via_rtc_command(RTC_CMD_WRITE(RTC_REG_WRITE_PROTECT), &temp);
+}
+
+static void via_shutdown(void)
+{
+	if (rbv_present) {
+		via2[rBufB] &= ~0x04;
+	} else {
+		/* Direction of vDirB is output */
+		via2[vDirB] |= 0x04;
+		/* Send a value of 0 on that line */
+		via2[vBufB] &= ~0x04;
+		mdelay(1000);
+	}
+}
+
+static void oss_shutdown(void)
+{
+	oss->rom_ctrl = OSS_POWEROFF;
+}
+
+#ifdef CONFIG_ADB_CUDA
+static void cuda_restart(void)
+{
+	struct adb_request req;
+
+	if (cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_RESET_SYSTEM) < 0)
+		return;
+	while (!req.complete)
+		cuda_poll();
+}
+
+static void cuda_shutdown(void)
+{
+	struct adb_request req;
+
+	if (cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_POWERDOWN) < 0)
+		return;
+
+	/* Avoid infinite polling loop when PSU is not under Cuda control */
+	switch (macintosh_config->ident) {
+	case MAC_MODEL_C660:
+	case MAC_MODEL_Q605:
+	case MAC_MODEL_Q605_ACC:
+	case MAC_MODEL_P475:
+	case MAC_MODEL_P475F:
+		return;
+	}
+
+	while (!req.complete)
+		cuda_poll();
+}
+#endif /* CONFIG_ADB_CUDA */
+
+/*
+ *-------------------------------------------------------------------
+ * Below this point are the generic routines; they'll dispatch to the
+ * correct routine for the hardware on which we're running.
+ *-------------------------------------------------------------------
+ */
+
+#if IS_ENABLED(CONFIG_NVRAM)
+unsigned char mac_pram_read_byte(int addr)
+{
+	switch (macintosh_config->adb_type) {
+	case MAC_ADB_IOP:
+	case MAC_ADB_II:
+	case MAC_ADB_PB1:
+		return via_pram_read_byte(addr);
+#ifdef CONFIG_ADB_CUDA
+	case MAC_ADB_EGRET:
+	case MAC_ADB_CUDA:
+		return cuda_pram_read_byte(addr);
+#endif
+#ifdef CONFIG_ADB_PMU
+	case MAC_ADB_PB2:
+		return pmu_pram_read_byte(addr);
+#endif
+	default:
+		return 0xFF;
+	}
+}
+
+void mac_pram_write_byte(unsigned char val, int addr)
+{
+	switch (macintosh_config->adb_type) {
+	case MAC_ADB_IOP:
+	case MAC_ADB_II:
+	case MAC_ADB_PB1:
+		via_pram_write_byte(val, addr);
+		break;
+#ifdef CONFIG_ADB_CUDA
+	case MAC_ADB_EGRET:
+	case MAC_ADB_CUDA:
+		cuda_pram_write_byte(val, addr);
+		break;
+#endif
+#ifdef CONFIG_ADB_PMU
+	case MAC_ADB_PB2:
+		pmu_pram_write_byte(val, addr);
+		break;
+#endif
+	default:
+		break;
+	}
+}
+
+ssize_t mac_pram_get_size(void)
+{
+	return 256;
+}
+#endif /* CONFIG_NVRAM */
+
+void mac_poweroff(void)
+{
+	if (oss_present) {
+		oss_shutdown();
+	} else if (macintosh_config->adb_type == MAC_ADB_II) {
+		via_shutdown();
+#ifdef CONFIG_ADB_CUDA
+	} else if (macintosh_config->adb_type == MAC_ADB_EGRET ||
+	           macintosh_config->adb_type == MAC_ADB_CUDA) {
+		cuda_shutdown();
+#endif
+#ifdef CONFIG_ADB_PMU
+	} else if (macintosh_config->adb_type == MAC_ADB_PB2) {
+		pmu_shutdown();
+#endif
+	}
+
+	pr_crit("It is now safe to turn off your Macintosh.\n");
+	local_irq_disable();
+	while(1);
+}
+
+void mac_reset(void)
+{
+	if (macintosh_config->adb_type == MAC_ADB_II &&
+	    macintosh_config->ident != MAC_MODEL_SE30) {
+		/* need ROMBASE in booter */
+		/* indeed, plus need to MAP THE ROM !! */
+
+		if (mac_bi_data.rombase == 0)
+			mac_bi_data.rombase = 0x40800000;
+
+		/* works on some */
+		rom_reset = (void *) (mac_bi_data.rombase + 0xa);
+
+		local_irq_disable();
+		rom_reset();
+#ifdef CONFIG_ADB_CUDA
+	} else if (macintosh_config->adb_type == MAC_ADB_EGRET ||
+	           macintosh_config->adb_type == MAC_ADB_CUDA) {
+		cuda_restart();
+#endif
+#ifdef CONFIG_ADB_PMU
+	} else if (macintosh_config->adb_type == MAC_ADB_PB2) {
+		pmu_restart();
+#endif
+	} else if (CPU_IS_030) {
+
+		/* 030-specific reset routine.  The idea is general, but the
+		 * specific registers to reset are '030-specific.  Until I
+		 * have a non-030 machine, I can't test anything else.
+		 *  -- C. Scott Ananian <cananian@alumni.princeton.edu>
+		 */
+
+		unsigned long rombase = 0x40000000;
+
+		/* make a 1-to-1 mapping, using the transparent tran. reg. */
+		unsigned long virt = (unsigned long) mac_reset;
+		unsigned long phys = virt_to_phys(mac_reset);
+		unsigned long addr = (phys&0xFF000000)|0x8777;
+		unsigned long offset = phys-virt;
+
+		local_irq_disable(); /* lets not screw this up, ok? */
+		__asm__ __volatile__(".chip 68030\n\t"
+				     "pmove %0,%/tt0\n\t"
+				     ".chip 68k"
+				     : : "m" (addr));
+		/* Now jump to physical address so we can disable MMU */
+		__asm__ __volatile__(
+		    ".chip 68030\n\t"
+		    "lea %/pc@(1f),%/a0\n\t"
+		    "addl %0,%/a0\n\t"/* fixup target address and stack ptr */
+		    "addl %0,%/sp\n\t"
+		    "pflusha\n\t"
+		    "jmp %/a0@\n\t" /* jump into physical memory */
+		    "0:.long 0\n\t" /* a constant zero. */
+		    /* OK.  Now reset everything and jump to reset vector. */
+		    "1:\n\t"
+		    "lea %/pc@(0b),%/a0\n\t"
+		    "pmove %/a0@, %/tc\n\t" /* disable mmu */
+		    "pmove %/a0@, %/tt0\n\t" /* disable tt0 */
+		    "pmove %/a0@, %/tt1\n\t" /* disable tt1 */
+		    "movel #0, %/a0\n\t"
+		    "movec %/a0, %/vbr\n\t" /* clear vector base register */
+		    "movec %/a0, %/cacr\n\t" /* disable caches */
+		    "movel #0x0808,%/a0\n\t"
+		    "movec %/a0, %/cacr\n\t" /* flush i&d caches */
+		    "movew #0x2700,%/sr\n\t" /* set up status register */
+		    "movel %1@(0x0),%/a0\n\t"/* load interrupt stack pointer */
+		    "movec %/a0, %/isp\n\t"
+		    "movel %1@(0x4),%/a0\n\t" /* load reset vector */
+		    "reset\n\t" /* reset external devices */
+		    "jmp %/a0@\n\t" /* jump to the reset vector */
+		    ".chip 68k"
+		    : : "r" (offset), "a" (rombase) : "a0");
+	}
+
+	/* should never get here */
+	pr_crit("Restart failed. Please restart manually.\n");
+	local_irq_disable();
+	while(1);
+}
+
+/*
+ * This function translates seconds since 1970 into a proper date.
+ *
+ * Algorithm cribbed from glibc2.1, __offtime().
+ *
+ * This is roughly same as rtc_time64_to_tm(), which we should probably
+ * use here, but it's only available when CONFIG_RTC_LIB is enabled.
+ */
+#define SECS_PER_MINUTE (60)
+#define SECS_PER_HOUR  (SECS_PER_MINUTE * 60)
+#define SECS_PER_DAY   (SECS_PER_HOUR * 24)
+
+static void unmktime(time64_t time, long offset,
+		     int *yearp, int *monp, int *dayp,
+		     int *hourp, int *minp, int *secp)
+{
+        /* How many days come before each month (0-12).  */
+	static const unsigned short int __mon_yday[2][13] =
+	{
+		/* Normal years.  */
+		{ 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
+		/* Leap years.  */
+		{ 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 }
+	};
+	int days, rem, y, wday, yday;
+	const unsigned short int *ip;
+
+	days = div_u64_rem(time, SECS_PER_DAY, &rem);
+	rem += offset;
+	while (rem < 0) {
+		rem += SECS_PER_DAY;
+		--days;
+	}
+	while (rem >= SECS_PER_DAY) {
+		rem -= SECS_PER_DAY;
+		++days;
+	}
+	*hourp = rem / SECS_PER_HOUR;
+	rem %= SECS_PER_HOUR;
+	*minp = rem / SECS_PER_MINUTE;
+	*secp = rem % SECS_PER_MINUTE;
+	/* January 1, 1970 was a Thursday. */
+	wday = (4 + days) % 7; /* Day in the week. Not currently used */
+	if (wday < 0) wday += 7;
+	y = 1970;
+
+#define DIV(a, b) ((a) / (b) - ((a) % (b) < 0))
+#define LEAPS_THRU_END_OF(y) (DIV (y, 4) - DIV (y, 100) + DIV (y, 400))
+#define __isleap(year)	\
+  ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0))
+
+	while (days < 0 || days >= (__isleap (y) ? 366 : 365))
+	{
+		/* Guess a corrected year, assuming 365 days per year.  */
+		long int yg = y + days / 365 - (days % 365 < 0);
+
+		/* Adjust DAYS and Y to match the guessed year.  */
+		days -= (yg - y) * 365 +
+			LEAPS_THRU_END_OF(yg - 1) - LEAPS_THRU_END_OF(y - 1);
+		y = yg;
+	}
+	*yearp = y - 1900;
+	yday = days; /* day in the year.  Not currently used. */
+	ip = __mon_yday[__isleap(y)];
+	for (y = 11; days < (long int) ip[y]; --y)
+		continue;
+	days -= ip[y];
+	*monp = y;
+	*dayp = days + 1; /* day in the month */
+	return;
+}
+
+/*
+ * Read/write the hardware clock.
+ */
+
+int mac_hwclk(int op, struct rtc_time *t)
+{
+	time64_t now;
+
+	if (!op) { /* read */
+		switch (macintosh_config->adb_type) {
+		case MAC_ADB_IOP:
+		case MAC_ADB_II:
+		case MAC_ADB_PB1:
+			now = via_read_time();
+			break;
+#ifdef CONFIG_ADB_CUDA
+		case MAC_ADB_EGRET:
+		case MAC_ADB_CUDA:
+			now = cuda_get_time();
+			break;
+#endif
+#ifdef CONFIG_ADB_PMU
+		case MAC_ADB_PB2:
+			now = pmu_get_time();
+			break;
+#endif
+		default:
+			now = 0;
+		}
+
+		t->tm_wday = 0;
+		unmktime(now, 0,
+			 &t->tm_year, &t->tm_mon, &t->tm_mday,
+			 &t->tm_hour, &t->tm_min, &t->tm_sec);
+		pr_debug("%s: read %ptR\n", __func__, t);
+	} else { /* write */
+		pr_debug("%s: tried to write %ptR\n", __func__, t);
+
+		switch (macintosh_config->adb_type) {
+		case MAC_ADB_IOP:
+		case MAC_ADB_II:
+		case MAC_ADB_PB1:
+			via_set_rtc_time(t);
+			break;
+#ifdef CONFIG_ADB_CUDA
+		case MAC_ADB_EGRET:
+		case MAC_ADB_CUDA:
+			cuda_set_rtc_time(t);
+			break;
+#endif
+#ifdef CONFIG_ADB_PMU
+		case MAC_ADB_PB2:
+			pmu_set_rtc_time(t);
+			break;
+#endif
+		default:
+			return -ENODEV;
+		}
+	}
+	return 0;
+}