microblaze: Convert axi timer to DM driver

Move axi timer driver from Microblaze to generic location.
Origin implementation was irq based with counting down timer.

CONFIG_TIMER drivers are designed differently that timer is free running up
timer with automatic reload without any interrupt.
Information about clock rates are find out in timer_pre_probe() that's why
there is no need to get any additional information from DT in the driver
itself (only register offset).

Signed-off-by: Michal Simek <michal.simek@amd.com>
Tested-by: Ovidiu Panait <ovidiu.panait@windriver.com>
Link: https://lore.kernel.org/r/6c12fc86bbc1f17d05c25018862e7b7b03346b36.1654684731.git.michal.simek@amd.com

3 files changed, 1 insertions, 150 deletions

diff --git a/arch/microblaze/cpu/Makefile b/arch/microblaze/cpu/Makefile
index ea65a09..1c586a7 100644
--- a/arch/microblaze/cpu/Makefile
+++ b/arch/microblaze/cpu/Makefile
@@ -5,7 +5,7 @@
 
 extra-y	= start.o
 obj-y	= irq.o
-obj-y	+= interrupts.o cache.o exception.o timer.o cpuinfo.o
+obj-y	+= interrupts.o cache.o exception.o cpuinfo.o
 obj-$(CONFIG_STATIC_RELA)	+= relocate.o
 obj-$(CONFIG_XILINX_MICROBLAZE0_PVR) += pvr.o
 obj-$(CONFIG_SPL_BUILD)	+= spl.o
diff --git a/arch/microblaze/cpu/timer.c b/arch/microblaze/cpu/timer.c
deleted file mode 100644
index 647bdcd..0000000
--- a/arch/microblaze/cpu/timer.c
+++ /dev/null
@@ -1,123 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0+
-/*
- * (C) Copyright 2007 Michal Simek
- *
- * Michal  SIMEK <monstr@monstr.eu>
- */
-
-#include <common.h>
-#include <fdtdec.h>
-#include <init.h>
-#include <log.h>
-#include <time.h>
-#include <asm/global_data.h>
-#include <asm/microblaze_timer.h>
-#include <asm/microblaze_intc.h>
-#include <linux/delay.h>
-
-DECLARE_GLOBAL_DATA_PTR;
-
-volatile int timestamp = 0;
-microblaze_timer_t *tmr;
-
-ulong get_timer (ulong base)
-{
-	if (tmr)
-		return timestamp - base;
-	return timestamp++ - base;
-}
-
-void __udelay(unsigned long usec)
-{
-	u32 i;
-
-	if (tmr) {
-		i = get_timer(0);
-		while ((get_timer(0) - i) < (usec / 1000))
-			;
-	}
-}
-
-#ifndef CONFIG_SPL_BUILD
-static void timer_isr(void *arg)
-{
-	timestamp++;
-	tmr->control = tmr->control | TIMER_INTERRUPT;
-}
-
-int timer_init (void)
-{
-	int irq = -1;
-	u32 preload = 0;
-	u32 ret = 0;
-	const void *blob = gd->fdt_blob;
-	int node = 0;
-	u32 cell[2];
-
-	debug("TIMER: Initialization\n");
-
-	/* Do not init before relocation */
-	if (!(gd->flags & GD_FLG_RELOC))
-		return 0;
-
-	node = fdt_node_offset_by_compatible(blob, node,
-				"xlnx,xps-timer-1.00.a");
-	if (node != -1) {
-		fdt_addr_t base = fdtdec_get_addr(blob, node, "reg");
-		if (base == FDT_ADDR_T_NONE)
-			return -1;
-
-		debug("TIMER: Base addr %lx\n", base);
-		tmr = (microblaze_timer_t *)base;
-
-		ret = fdtdec_get_int_array(blob, node, "interrupts",
-					    cell, ARRAY_SIZE(cell));
-		if (ret)
-			return ret;
-
-		irq = cell[0];
-		debug("TIMER: IRQ %x\n", irq);
-
-		preload = fdtdec_get_int(blob, node, "clock-frequency", 0);
-		preload /= CONFIG_SYS_HZ;
-	} else {
-		return node;
-	}
-
-	if (tmr && preload && irq >= 0) {
-		tmr->loadreg = preload;
-		tmr->control = TIMER_INTERRUPT | TIMER_RESET;
-		tmr->control = TIMER_ENABLE | TIMER_ENABLE_INTR |\
-					TIMER_RELOAD | TIMER_DOWN_COUNT;
-		timestamp = 0;
-		ret = install_interrupt_handler (irq, timer_isr, (void *)tmr);
-		if (ret)
-			tmr = NULL;
-	}
-	/* No problem if timer is not found/initialized */
-	return 0;
-}
-#else
-int timer_init(void)
-{
-	return 0;
-}
-#endif
-
-/*
- * This function is derived from PowerPC code (read timebase as long long).
- * On Microblaze it just returns the timer value.
- */
-unsigned long long get_ticks(void)
-{
-	return get_timer(0);
-}
-
-/*
- * This function is derived from PowerPC code (timebase clock frequency).
- * On Microblaze it returns the number of timer ticks per second.
- */
-ulong get_tbclk(void)
-{
-	return CONFIG_SYS_HZ;
-}
diff --git a/arch/microblaze/include/asm/microblaze_timer.h b/arch/microblaze/include/asm/microblaze_timer.h
deleted file mode 100644
index 2ed1651..0000000
--- a/arch/microblaze/include/asm/microblaze_timer.h
+++ /dev/null
@@ -1,26 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0+ */
-/*
- * (C) Copyright 2007 Michal Simek
- *
- * Michal  SIMEK <monstr@monstr.cz>
- */
-
-#define TIMER_ENABLE_ALL    0x400 /* ENALL */
-#define TIMER_PWM           0x200 /* PWMA0 */
-#define TIMER_INTERRUPT     0x100 /* T0INT */
-#define TIMER_ENABLE        0x080 /* ENT0 */
-#define TIMER_ENABLE_INTR   0x040 /* ENIT0 */
-#define TIMER_RESET         0x020 /* LOAD0 */
-#define TIMER_RELOAD        0x010 /* ARHT0 */
-#define TIMER_EXT_CAPTURE   0x008 /* CAPT0 */
-#define TIMER_EXT_COMPARE   0x004 /* GENT0 */
-#define TIMER_DOWN_COUNT    0x002 /* UDT0 */
-#define TIMER_CAPTURE_MODE  0x001 /* MDT0 */
-
-typedef volatile struct microblaze_timer_t {
-	int control; /* control/statuc register TCSR */
-	int loadreg; /* load register TLR */
-	int counter; /* timer/counter register */
-} microblaze_timer_t;
-
-int timer_init(void);