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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/arch/m68k/mvme16x/config.c
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@@ -19,6 +19,7 @@
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 #include <linux/mm.h>
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 #include <linux/seq_file.h>
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 #include <linux/tty.h>
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+#include <linux/clocksource.h>
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 #include <linux/console.h>
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 #include <linux/linkage.h>
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 #include <linux/init.h>
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@@ -31,7 +32,6 @@
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 #include <asm/bootinfo.h>
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 #include <asm/bootinfo-vme.h>
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 #include <asm/byteorder.h>
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-#include <asm/pgtable.h>
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 #include <asm/setup.h>
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 #include <asm/irq.h>
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 #include <asm/traps.h>
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@@ -44,7 +44,6 @@
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44
 
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 static void mvme16x_get_model(char *model);
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 extern void mvme16x_sched_init(irq_handler_t handler);
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-extern u32 mvme16x_gettimeoffset(void);
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 extern int mvme16x_hwclk (int, struct rtc_time *);
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 extern void mvme16x_reset (void);
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49
 
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@@ -115,11 +114,11 @@
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 	m68k_setup_user_interrupt(VEC_USER, 192);
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 }
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-#define pcc2chip	((volatile u_char *)0xfff42000)
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-#define PccSCCMICR	0x1d
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-#define PccSCCTICR	0x1e
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-#define PccSCCRICR	0x1f
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-#define PccTPIACKR	0x25
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+#define PCC2CHIP   (0xfff42000)
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+#define PCCSCCMICR (PCC2CHIP + 0x1d)
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+#define PCCSCCTICR (PCC2CHIP + 0x1e)
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+#define PCCSCCRICR (PCC2CHIP + 0x1f)
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+#define PCCTPIACKR (PCC2CHIP + 0x25)
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122
 
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 #ifdef CONFIG_EARLY_PRINTK
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@@ -227,10 +226,10 @@
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 	base_addr[CyIER] = CyTxMpty;
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 	while (1) {
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-		if (pcc2chip[PccSCCTICR] & 0x20)
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+		if (in_8(PCCSCCTICR) & 0x20)
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 		{
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 			/* We have a Tx int. Acknowledge it */
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-			sink = pcc2chip[PccTPIACKR];
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+			sink = in_8(PCCTPIACKR);
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 			if ((base_addr[CyLICR] >> 2) == port) {
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 				if (i == count) {
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 					/* Last char of string is now output */
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@@ -272,7 +271,6 @@
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     mach_max_dma_address = 0xffffffff;
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     mach_sched_init      = mvme16x_sched_init;
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     mach_init_IRQ        = mvme16x_init_IRQ;
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-    arch_gettimeoffset   = mvme16x_gettimeoffset;
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     mach_hwclk           = mvme16x_hwclk;
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     mach_reset		 = mvme16x_reset;
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     mach_get_model       = mvme16x_get_model;
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@@ -345,13 +343,43 @@
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 	return IRQ_HANDLED;
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 }
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345
 
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+static u64 mvme16x_read_clk(struct clocksource *cs);
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+
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+static struct clocksource mvme16x_clk = {
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+	.name   = "pcc",
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+	.rating = 250,
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+	.read   = mvme16x_read_clk,
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+	.mask   = CLOCKSOURCE_MASK(32),
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+	.flags  = CLOCK_SOURCE_IS_CONTINUOUS,
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+};
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+
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+static u32 clk_total;
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+
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+#define PCC_TIMER_CLOCK_FREQ 1000000
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+#define PCC_TIMER_CYCLES     (PCC_TIMER_CLOCK_FREQ / HZ)
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+
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+#define PCCTCMP1             (PCC2CHIP + 0x04)
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+#define PCCTCNT1             (PCC2CHIP + 0x08)
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+#define PCCTOVR1             (PCC2CHIP + 0x17)
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+#define PCCTIC1              (PCC2CHIP + 0x1b)
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+
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+#define PCCTOVR1_TIC_EN      0x01
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+#define PCCTOVR1_COC_EN      0x02
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+#define PCCTOVR1_OVR_CLR     0x04
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+
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+#define PCCTIC1_INT_LEVEL    6
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+#define PCCTIC1_INT_CLR      0x08
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+#define PCCTIC1_INT_EN       0x10
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+
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 static irqreturn_t mvme16x_timer_int (int irq, void *dev_id)
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 {
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 	irq_handler_t timer_routine = dev_id;
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 	unsigned long flags;
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 	local_irq_save(flags);
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-	*(volatile unsigned char *)0xfff4201b |= 8;
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+	out_8(PCCTOVR1, PCCTOVR1_OVR_CLR | PCCTOVR1_TIC_EN | PCCTOVR1_COC_EN);
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+	out_8(PCCTIC1, PCCTIC1_INT_EN | PCCTIC1_INT_CLR | PCCTIC1_INT_LEVEL);
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+	clk_total += PCC_TIMER_CYCLES;
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 	timer_routine(0, NULL);
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 	local_irq_restore(flags);
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385
 
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@@ -364,13 +392,16 @@
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     int irq;
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393
 
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     /* Using PCCchip2 or MC2 chip tick timer 1 */
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-    *(volatile unsigned long *)0xfff42008 = 0;
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-    *(volatile unsigned long *)0xfff42004 = 10000;	/* 10ms */
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-    *(volatile unsigned char *)0xfff42017 |= 3;
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-    *(volatile unsigned char *)0xfff4201b = 0x16;
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-    if (request_irq(MVME16x_IRQ_TIMER, mvme16x_timer_int, 0, "timer",
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+    if (request_irq(MVME16x_IRQ_TIMER, mvme16x_timer_int, IRQF_TIMER, "timer",
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                     timer_routine))
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 	panic ("Couldn't register timer int");
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+
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+    out_be32(PCCTCNT1, 0);
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+    out_be32(PCCTCMP1, PCC_TIMER_CYCLES);
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+    out_8(PCCTOVR1, PCCTOVR1_OVR_CLR | PCCTOVR1_TIC_EN | PCCTOVR1_COC_EN);
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+    out_8(PCCTIC1, PCCTIC1_INT_EN | PCCTIC1_INT_CLR | PCCTIC1_INT_LEVEL);
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+
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+    clocksource_register_hz(&mvme16x_clk, PCC_TIMER_CLOCK_FREQ);
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405
 
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     if (brdno == 0x0162 || brdno == 0x172)
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 	irq = MVME162_IRQ_ABORT;
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@@ -381,11 +412,23 @@
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 	panic ("Couldn't register abort int");
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 }
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-
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-/* This is always executed with interrupts disabled.  */
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-u32 mvme16x_gettimeoffset(void)
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+static u64 mvme16x_read_clk(struct clocksource *cs)
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 {
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-    return (*(volatile u32 *)0xfff42008) * 1000;
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+	unsigned long flags;
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+	u8 overflow, tmp;
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+	u32 ticks;
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+
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+	local_irq_save(flags);
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+	tmp = in_8(PCCTOVR1) >> 4;
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+	ticks = in_be32(PCCTCNT1);
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+	overflow = in_8(PCCTOVR1) >> 4;
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+	if (overflow != tmp)
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+		ticks = in_be32(PCCTCNT1);
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+	ticks += overflow * PCC_TIMER_CYCLES;
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+	ticks += clk_total;
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+	local_irq_restore(flags);
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+
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+	return ticks;
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 }
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 int bcd2int (unsigned char b)