Merge tag 'char-misc-5.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc

Pull char/misc driver updates from Greg KH:
 "Here is the big char/misc driver patch pull request for 5.1-rc1.

  The largest thing by far is the new habanalabs driver for their AI
  accelerator chip. For now it is in the drivers/misc directory but will
  probably move to a new directory soon along with other drivers of this
  type.

  Other than that, just the usual set of individual driver updates and
  fixes. There's an "odd" merge in here from the DRM tree that they
  asked me to do as the MEI driver is starting to interact with the i915
  driver, and it needed some coordination. All of those patches have
  been properly acked by the relevant subsystem maintainers.

  All of these have been in linux-next with no reported issues, most for
  quite some time"

* tag 'char-misc-5.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (219 commits)
  habanalabs: adjust Kconfig to fix build errors
  habanalabs: use %px instead of %p in error print
  habanalabs: use do_div for 64-bit divisions
  intel_th: gth: Fix an off-by-one in output unassigning
  habanalabs: fix little-endian<->cpu conversion warnings
  habanalabs: use NULL to initialize array of pointers
  habanalabs: fix little-endian<->cpu conversion warnings
  habanalabs: soft-reset device if context-switch fails
  habanalabs: print pointer using %p
  habanalabs: fix memory leak with CBs with unaligned size
  habanalabs: return correct error code on MMU mapping failure
  habanalabs: add comments in uapi/misc/habanalabs.h
  habanalabs: extend QMAN0 job timeout
  habanalabs: set DMA0 completion to SOB 1007
  habanalabs: fix validation of WREG32 to DMA completion
  habanalabs: fix mmu cache registers init
  habanalabs: disable CPU access on timeouts
  habanalabs: add MMU DRAM default page mapping
  habanalabs: Dissociate RAZWI info from event types
  misc/habanalabs: adjust Kconfig to fix build errors
  ...

1 files changed, 108 insertions, 66 deletions

diff --git a/arch/m68k/mac/misc.c b/arch/m68k/mac/misc.c
index 1423e1fe0261..90f4e9ca1276 100644
--- a/arch/m68k/mac/misc.c
+++ b/arch/m68k/mac/misc.c
@@ -36,8 +36,9 @@
 
 static void (*rom_reset)(void);
 
+#if IS_ENABLED(CONFIG_NVRAM)
 #ifdef CONFIG_ADB_CUDA
-static __u8 cuda_read_pram(int offset)
+static unsigned char cuda_pram_read_byte(int offset)
 {
 	struct adb_request req;
 
@@ -49,7 +50,7 @@ static __u8 cuda_read_pram(int offset)
 	return req.reply[3];
 }
 
-static void cuda_write_pram(int offset, __u8 data)
+static void cuda_pram_write_byte(unsigned char data, int offset)
 {
 	struct adb_request req;
 
@@ -62,29 +63,29 @@ static void cuda_write_pram(int offset, __u8 data)
 #endif /* CONFIG_ADB_CUDA */
 
 #ifdef CONFIG_ADB_PMU
-static __u8 pmu_read_pram(int offset)
+static unsigned char pmu_pram_read_byte(int offset)
 {
 	struct adb_request req;
 
-	if (pmu_request(&req, NULL, 3, PMU_READ_NVRAM,
-			(offset >> 8) & 0xFF, offset & 0xFF) < 0)
+	if (pmu_request(&req, NULL, 3, PMU_READ_XPRAM,
+	                offset & 0xFF, 1) < 0)
 		return 0;
-	while (!req.complete)
-		pmu_poll();
-	return req.reply[3];
+	pmu_wait_complete(&req);
+
+	return req.reply[0];
 }
 
-static void pmu_write_pram(int offset, __u8 data)
+static void pmu_pram_write_byte(unsigned char data, int offset)
 {
 	struct adb_request req;
 
-	if (pmu_request(&req, NULL, 4, PMU_WRITE_NVRAM,
-			(offset >> 8) & 0xFF, offset & 0xFF, data) < 0)
+	if (pmu_request(&req, NULL, 4, PMU_WRITE_XPRAM,
+	                offset & 0xFF, 1, data) < 0)
 		return;
-	while (!req.complete)
-		pmu_poll();
+	pmu_wait_complete(&req);
 }
 #endif /* CONFIG_ADB_PMU */
+#endif /* CONFIG_NVRAM */
 
 /*
  * VIA PRAM/RTC access routines
@@ -93,7 +94,7 @@ static void pmu_write_pram(int offset, __u8 data)
  * the RTC should be enabled.
  */
 
-static __u8 via_pram_readbyte(void)
+static __u8 via_rtc_recv(void)
 {
 	int i, reg;
 	__u8 data;
@@ -120,7 +121,7 @@ static __u8 via_pram_readbyte(void)
 	return data;
 }
 
-static void via_pram_writebyte(__u8 data)
+static void via_rtc_send(__u8 data)
 {
 	int i, reg, bit;
 
@@ -137,6 +138,31 @@ static void via_pram_writebyte(__u8 data)
 }
 
 /*
+ * 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
@@ -145,29 +171,33 @@ static void via_pram_writebyte(__u8 data)
  * This function disables all interrupts while running.
  */
 
-static void via_pram_command(int command, __u8 *data)
+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_pram_writebyte((command & 0xFF00) >> 8);
-		via_pram_writebyte(command & 0xFF);
-		is_read = command & 0x8000;
+		via_rtc_send((command & 0xFF00) >> 8);
+		via_rtc_send(command & 0xFF);
+		is_read = command & (RTC_FLG_READ << 8);
 	} else {			/* one-byte command */
-		via_pram_writebyte(command);
-		is_read = command & 0x80;
+		via_rtc_send(command);
+		is_read = command & RTC_FLG_READ;
 	}
 	if (is_read) {
-		*data = via_pram_readbyte();
+		*data = via_rtc_recv();
 	} else {
-		via_pram_writebyte(*data);
+		via_rtc_send(*data);
 	}
 
 	/* All done, disable the RTC */
@@ -177,14 +207,30 @@ static void via_pram_command(int command, __u8 *data)
 	local_irq_restore(flags);
 }
 
-static __u8 via_read_pram(int offset)
+#if IS_ENABLED(CONFIG_NVRAM)
+static unsigned char via_pram_read_byte(int offset)
 {
-	return 0;
+	unsigned char temp;
+
+	via_rtc_command(RTC_CMD_XPRAM_READ | RTC_CMD_XPRAM_ARG(offset), &temp);
+
+	return temp;
 }
 
-static void via_write_pram(int offset, __u8 data)
+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.
@@ -201,10 +247,10 @@ static time64_t via_read_time(void)
 	} result, last_result;
 	int count = 1;
 
-	via_pram_command(0x81, &last_result.cdata[3]);
-	via_pram_command(0x85, &last_result.cdata[2]);
-	via_pram_command(0x89, &last_result.cdata[1]);
-	via_pram_command(0x8D, &last_result.cdata[0]);
+	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
@@ -212,10 +258,14 @@ static time64_t via_read_time(void)
 	 */
 
 	while (1) {
-		via_pram_command(0x81, &result.cdata[3]);
-		via_pram_command(0x85, &result.cdata[2]);
-		via_pram_command(0x89, &result.cdata[1]);
-		via_pram_command(0x8D, &result.cdata[0]);
+		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;
@@ -254,18 +304,18 @@ static void via_set_rtc_time(struct rtc_time *tm)
 	/* Clear the write protect bit */
 
 	temp = 0x55;
-	via_pram_command(0x35, &temp);
+	via_rtc_command(RTC_CMD_WRITE(RTC_REG_WRITE_PROTECT), &temp);
 
 	data.idata = lower_32_bits(time + RTC_OFFSET);
-	via_pram_command(0x01, &data.cdata[3]);
-	via_pram_command(0x05, &data.cdata[2]);
-	via_pram_command(0x09, &data.cdata[1]);
-	via_pram_command(0x0D, &data.cdata[0]);
+	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 = 0xD5;
-	via_pram_command(0x35, &temp);
+	temp = 0x55 | RTC_FLG_WRITE_PROTECT;
+	via_rtc_command(RTC_CMD_WRITE(RTC_REG_WRITE_PROTECT), &temp);
 }
 
 static void via_shutdown(void)
@@ -326,66 +376,58 @@ static void cuda_shutdown(void)
  *-------------------------------------------------------------------
  */
 
-void mac_pram_read(int offset, __u8 *buffer, int len)
+#if IS_ENABLED(CONFIG_NVRAM)
+unsigned char mac_pram_read_byte(int addr)
 {
-	__u8 (*func)(int);
-	int i;
-
 	switch (macintosh_config->adb_type) {
 	case MAC_ADB_IOP:
 	case MAC_ADB_II:
 	case MAC_ADB_PB1:
-		func = via_read_pram;
-		break;
+		return via_pram_read_byte(addr);
 #ifdef CONFIG_ADB_CUDA
 	case MAC_ADB_EGRET:
 	case MAC_ADB_CUDA:
-		func = cuda_read_pram;
-		break;
+		return cuda_pram_read_byte(addr);
 #endif
 #ifdef CONFIG_ADB_PMU
 	case MAC_ADB_PB2:
-		func = pmu_read_pram;
-		break;
+		return pmu_pram_read_byte(addr);
 #endif
 	default:
-		return;
-	}
-	for (i = 0 ; i < len ; i++) {
-		buffer[i] = (*func)(offset++);
+		return 0xFF;
 	}
 }
 
-void mac_pram_write(int offset, __u8 *buffer, int len)
+void mac_pram_write_byte(unsigned char val, int addr)
 {
-	void (*func)(int, __u8);
-	int i;
-
 	switch (macintosh_config->adb_type) {
 	case MAC_ADB_IOP:
 	case MAC_ADB_II:
 	case MAC_ADB_PB1:
-		func = via_write_pram;
+		via_pram_write_byte(val, addr);
 		break;
 #ifdef CONFIG_ADB_CUDA
 	case MAC_ADB_EGRET:
 	case MAC_ADB_CUDA:
-		func = cuda_write_pram;
+		cuda_pram_write_byte(val, addr);
 		break;
 #endif
 #ifdef CONFIG_ADB_PMU
 	case MAC_ADB_PB2:
-		func = pmu_write_pram;
+		pmu_pram_write_byte(val, addr);
 		break;
 #endif
 	default:
-		return;
-	}
-	for (i = 0 ; i < len ; i++) {
-		(*func)(offset++, buffer[i]);
+		break;
 	}
 }
 
+ssize_t mac_pram_get_size(void)
+{
+	return 256;
+}
+#endif /* CONFIG_NVRAM */
+
 void mac_poweroff(void)
 {
 	if (oss_present) {