rtl8211F_led_control

hc

2024-05-11 297b60346df8beafee954a0fd7c2d64f33f3b9bc

 kernel/arch/m68k/hp300/time.c
..
..
@@ -8,6 +8,7 @@
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8
  */
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9
 
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 #include <asm/ptrace.h>
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+#include <linux/clocksource.h>
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 #include <linux/types.h>
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 #include <linux/init.h>
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 #include <linux/sched.h>
..
..
@@ -19,6 +20,18 @@
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 #include <asm/traps.h>
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 #include <asm/blinken.h>
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22
 
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+static u64 hp300_read_clk(struct clocksource *cs);
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+
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+static struct clocksource hp300_clk = {
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+	.name   = "timer",
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+	.rating = 250,
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+	.read   = hp300_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, clk_offset;
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+
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 /* Clock hardware definitions */
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36
 
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 #define CLOCKBASE	0xf05f8000
..
..
@@ -28,13 +41,17 @@
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 #define	CLKCR3		CLKCR1
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 #define	CLKSR		CLKCR2
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 #define	CLKMSB1		0x5
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+#define	CLKLSB1		0x7
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 #define	CLKMSB2		0x9
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 #define	CLKMSB3		0xD
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47
 
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-/* This is for machines which generate the exact clock. */
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-#define USECS_PER_JIFFY (1000000/HZ)
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+#define	CLKSR_INT1	BIT(0)
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49
 
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-#define INTVAL ((10000 / 4) - 1)
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+/* This is for machines which generate the exact clock. */
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+
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+#define HP300_TIMER_CLOCK_FREQ 250000
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+#define HP300_TIMER_CYCLES     (HP300_TIMER_CLOCK_FREQ / HZ)
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+#define INTVAL                 (HP300_TIMER_CYCLES - 1)
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55
 
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 static irqreturn_t hp300_tick(int irq, void *dev_id)
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 {
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@@ -45,6 +62,8 @@
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 	local_irq_save(flags);
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 	in_8(CLOCKBASE + CLKSR);
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 	asm volatile ("movpw %1@(5),%0" : "=d" (tmp) : "a" (CLOCKBASE));
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+	clk_total += INTVAL;
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+	clk_offset = 0;
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 	timer_routine(0, NULL);
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 	local_irq_restore(flags);
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69
 
..
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@@ -53,20 +72,30 @@
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 	return IRQ_HANDLED;
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 }
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74
 
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-u32 hp300_gettimeoffset(void)
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+static u64 hp300_read_clk(struct clocksource *cs)
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 {
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-  /* Read current timer 1 value */
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-  unsigned char lsb, msb1, msb2;
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-  unsigned short ticks;
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+	unsigned long flags;
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+	unsigned char lsb, msb, msb_new;
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+	u32 ticks;
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80
 
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-  msb1 = in_8(CLOCKBASE + 5);
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-  lsb = in_8(CLOCKBASE + 7);
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-  msb2 = in_8(CLOCKBASE + 5);
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-  if (msb1 != msb2)
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-    /* A carry happened while we were reading.  Read it again */
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-    lsb = in_8(CLOCKBASE + 7);
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-  ticks = INTVAL - ((msb2 << 8) | lsb);
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-  return ((USECS_PER_JIFFY * ticks) / INTVAL) * 1000;
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+	local_irq_save(flags);
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+	/* Read current timer 1 value */
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+	msb = in_8(CLOCKBASE + CLKMSB1);
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+again:
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+	if ((in_8(CLOCKBASE + CLKSR) & CLKSR_INT1) && msb > 0)
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+		clk_offset = INTVAL;
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+	lsb = in_8(CLOCKBASE + CLKLSB1);
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+	msb_new = in_8(CLOCKBASE + CLKMSB1);
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+	if (msb_new != msb) {
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+		msb = msb_new;
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+		goto again;
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+	}
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+
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+	ticks = INTVAL - ((msb << 8) | lsb);
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+	ticks += clk_offset + 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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100
 
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 void __init hp300_sched_init(irq_handler_t vector)
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@@ -76,9 +105,11 @@
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105
 
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   asm volatile(" movpw %0,%1@(5)" : : "d" (INTVAL), "a" (CLOCKBASE));
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107
 
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-  if (request_irq(IRQ_AUTO_6, hp300_tick, 0, "timer tick", vector))
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+  if (request_irq(IRQ_AUTO_6, hp300_tick, IRQF_TIMER, "timer tick", vector))
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     pr_err("Couldn't register timer interrupt\n");
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110
 
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   out_8(CLOCKBASE + CLKCR2, 0x1);		/* select CR1 */
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   out_8(CLOCKBASE + CLKCR1, 0x40);		/* enable irq */
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+
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+  clocksource_register_hz(&hp300_clk, HP300_TIMER_CLOCK_FREQ);
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 }