rcar_gen3: drivers: micro delay generator
Signed-off-by: ldts <jramirez@baylibre.com>
diff --git a/drivers/renesas/rcar/delay/micro_delay.S b/drivers/renesas/rcar/delay/micro_delay.S
new file mode 100644
index 0000000..978973c
--- /dev/null
+++ b/drivers/renesas/rcar/delay/micro_delay.S
@@ -0,0 +1,109 @@
+/*
+ * Copyright (c) 2015-2018, Renesas Electronics Corporation. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <arch.h>
+#include <asm_macros.S>
+#include "micro_delay.h"
+
+#define CPG_BASE (0xE6150000)
+#define CPG_SMSTPCR1 (0x0134)
+#define CPG_CPGWPR (0x0900)
+
+/* Module bit for TMU ch3-5 */
+#define MSTPCR1_TMU1 (1 << 24)
+
+#define TMU3_BASE (0xE6FC0000)
+#define TMU_TSTR (0x0004)
+#define TMU_TCOR (0x0008)
+#define TMU_TCNT (0x000C)
+#define TMU_TCR (0x0010)
+/* Start bit for TMU ch3 */
+#define TSTR1_TMU3 (1 << 0)
+
+#define MIDR_CA57 (0x0D07 << MIDR_PN_SHIFT)
+#define MIDR_CA53 (0x0D03 << MIDR_PN_SHIFT)
+
+ .globl rcar_micro_delay
+#if (TMU3_MEASUREMENT == 1)
+ .globl tmu3_init
+ .globl tmu3_start
+ .globl tmu3_stop
+ .globl tcnt3_snapshot
+#endif
+ /* Aligned with the cache line */
+ .align 6
+
+func rcar_micro_delay
+ cbz x0, micro_delay_e
+ mrs x1, midr_el1
+ and x1, x1, #MIDR_PN_MASK << MIDR_PN_SHIFT
+ mov w2, #MIDR_CA53
+ cmp w1, w2
+ b.eq micro_delay_ca53
+ b micro_delay_ca57
+micro_delay_e:
+ ret
+endfunc rcar_micro_delay
+
+func micro_delay_ca57
+ca57_loop_1:
+ mov x1, #185
+ca57_loop_2:
+ subs x1, x1, #1
+ b.ne ca57_loop_2
+ subs x0, x0, #1
+ b.ne ca57_loop_1
+ ret
+endfunc micro_delay_ca57
+
+func micro_delay_ca53
+ca53_loop_1:
+ mov x1, #134
+ca53_loop_2:
+ subs x1, x1, #1
+ b.ne ca53_loop_2
+ subs x0, x0, #1
+ b.ne ca53_loop_1
+ ret
+endfunc micro_delay_ca53
+
+#if (TMU3_MEASUREMENT == 1)
+func tmu3_init
+ ldr x2, =CPG_BASE
+ ldr w0, [x2, #CPG_SMSTPCR1]
+ ldr w1, [x2, #CPG_MSTPSR1]
+ ldr w2, #MSTPCR1_TMU1
+ bl mstpcr_write
+ ret
+endfunc tmu3_init
+
+func tmu3_start
+ ldr x0, =TMU3_BASE
+ mov w1, #0xFFFFFFFF
+ str w1, [x0, TMU_TCNT]
+
+ ldr x0, =TMU3_BASE
+ ldrb w1, [x0, TMU_TSTR]
+ orr w1, w1, #TSTR1_TMU3
+ strb w1, [x0, TMU_TSTR]
+ ret
+endfunc tmu3_start
+
+func tcnt3_snapshot
+ ldr x0, =TMU3_BASE
+ ldr w0, [x0, TMU_TCNT]
+ ret
+endfunc tcnt3_snapshot
+
+
+func tmu3_stop
+ ldr x0, =TMU3_BASE
+ ldrb w1, [x0, TMU_TSTR]
+ and w1, w1, #~TSTR1_TMU3
+ strb w1, [x0, TMU_TSTR]
+ ret
+endfunc tmu3_stop
+#endif
diff --git a/drivers/renesas/rcar/delay/micro_delay.h b/drivers/renesas/rcar/delay/micro_delay.h
new file mode 100644
index 0000000..f598394
--- /dev/null
+++ b/drivers/renesas/rcar/delay/micro_delay.h
@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) 2015-2017, Renesas Electronics Corporation. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef MICRO_DELAY_H__
+#define MICRO_DELAY_H__
+
+#define TMU3_MEASUREMENT (0)
+
+#ifndef __ASSEMBLY__
+#include "stdint.h"
+void rcar_micro_delay(uint32_t count_us);
+
+#if (TMU3_MEASUREMENT == 1)
+void tmu3_start(void);
+void tmu3_init(void);
+void tmu3_stop(void);
+
+uint32_t tcnt3_snapshot(void);
+#endif
+
+#endif
+
+#endif