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/* SPDX-License-Identifier: BSD-2-Clause */
/*
* Copyright (c) 2016, Linaro Limited
* All rights reserved.
*/
#ifndef __DRIVERS_SERIAL_H
#define __DRIVERS_SERIAL_H
#include <assert.h>
#include <stdbool.h>
#include <types_ext.h>
#include <mm/core_memprot.h>
#include <mm/core_mmu.h>
struct serial_chip {
const struct serial_ops *ops;
};
struct serial_ops {
void (*putc)(struct serial_chip *chip, int ch);
void (*flush)(struct serial_chip *chip);
bool (*have_rx_data)(struct serial_chip *chip);
int (*getchar)(struct serial_chip *chip);
};
struct serial_driver {
/* Allocate device data and return the inner serial_chip */
struct serial_chip *(*dev_alloc)(void);
/*
* Initialize device from FDT node. @parms is device-specific,
* its meaning is as defined by the DT bindings for the characters
* following the ":" in /chosen/stdout-path. Typically for UART
* devices this is <baud>{<parity>{<bits>{<flow>}}} where:
* baud - baud rate in decimal
* parity - 'n' (none), 'o', (odd) or 'e' (even)
* bits - number of data bits
* flow - 'r' (rts)
* For example: 115200n8r
*/
int (*dev_init)(struct serial_chip *dev, const void *fdt,
int offset, const char *parms);
void (*dev_free)(struct serial_chip *dev);
};
struct io_pa_va {
paddr_t pa;
vaddr_t va;
};
/*
* Helper function to return a physical or virtual address for a device,
* depending on whether the MMU is enabled or not
*/
static inline vaddr_t io_pa_or_va(struct io_pa_va *p)
{
assert(p->pa);
if (cpu_mmu_enabled()) {
if (!p->va)
p->va = (vaddr_t)phys_to_virt_io(p->pa);
assert(p->va);
return p->va;
}
return p->pa;
}
#endif /*__DRIVERS_SERIASERIAL_H*/
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