2 * Copyright (c) 2017, Linaro Limited
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27 #include <drivers/stih_asc.h>
32 #define ASC_BAUDRATE 0x00
33 #define ASC_TXBUFFER 0x04
34 #define ASC_STATUS 0x14
36 #define ASC_STATUS_TX_EMPTY BIT(1)
37 #define ASC_STATUS_TX_HALF_EMPTY BIT(2)
39 static vaddr_t chip_to_base(struct serial_chip *chip)
41 struct stih_asc_pd *pd =
42 container_of(chip, struct stih_asc_pd, chip);
44 return io_pa_or_va(&pd->base);
47 static void stih_asc_flush(struct serial_chip *chip)
49 vaddr_t base = chip_to_base(chip);
51 while (!(read32(base + ASC_STATUS) & ASC_STATUS_TX_EMPTY))
55 static void stih_asc_putc(struct serial_chip *chip, int ch)
57 vaddr_t base = chip_to_base(chip);
59 while (!(read32(base + ASC_STATUS) & ASC_STATUS_TX_HALF_EMPTY))
62 write32(ch, base + ASC_TXBUFFER);
65 static const struct serial_ops stih_asc_ops = {
66 .flush = stih_asc_flush,
67 .putc = stih_asc_putc,
69 KEEP_PAGER(stih_asc_ops);
71 void stih_asc_init(struct stih_asc_pd *pd, vaddr_t base)
74 pd->chip.ops = &stih_asc_ops;