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-rw-r--r--arch/m68k/mac/misc.c665
1 files changed, 665 insertions, 0 deletions
diff --git a/arch/m68k/mac/misc.c b/arch/m68k/mac/misc.c
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+++ b/arch/m68k/mac/misc.c
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+// 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;
+}
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