1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * arch/arm/mach-pxa/include/mach/uncompress.h
4  *
5  * Author:	Nicolas Pitre
6  * Copyright:	(C) 2001 MontaVista Software Inc.
7  */
8 
9 #include <linux/serial_reg.h>
10 #include <asm/mach-types.h>
11 
12 #define FFUART_BASE	(0x40100000)
13 #define BTUART_BASE	(0x40200000)
14 #define STUART_BASE	(0x40700000)
15 
16 unsigned long uart_base;
17 unsigned int uart_shift;
18 unsigned int uart_is_pxa;
19 
uart_read(int offset)20 static inline unsigned char uart_read(int offset)
21 {
22 	return *(volatile unsigned char *)(uart_base + (offset << uart_shift));
23 }
24 
uart_write(unsigned char val,int offset)25 static inline void uart_write(unsigned char val, int offset)
26 {
27 	*(volatile unsigned char *)(uart_base + (offset << uart_shift)) = val;
28 }
29 
uart_is_enabled(void)30 static inline int uart_is_enabled(void)
31 {
32 	/* assume enabled by default for non-PXA uarts */
33 	return uart_is_pxa ? uart_read(UART_IER) & UART_IER_UUE : 1;
34 }
35 
putc(char c)36 static inline void putc(char c)
37 {
38 	if (!uart_is_enabled())
39 		return;
40 
41 	while (!(uart_read(UART_LSR) & UART_LSR_THRE))
42 		barrier();
43 
44 	uart_write(c, UART_TX);
45 }
46 
47 /*
48  * This does not append a newline
49  */
flush(void)50 static inline void flush(void)
51 {
52 }
53 
arch_decomp_setup(void)54 static inline void arch_decomp_setup(void)
55 {
56 	/* initialize to default */
57 	uart_base = FFUART_BASE;
58 	uart_shift = 2;
59 	uart_is_pxa = 1;
60 
61 	if (machine_is_littleton() || machine_is_intelmote2()
62 	    || machine_is_csb726() || machine_is_stargate2()
63 	    || machine_is_cm_x300() || machine_is_balloon3())
64 		uart_base = STUART_BASE;
65 
66 	if (machine_is_arcom_zeus()) {
67 		uart_base = 0x10000000;	/* nCS4 */
68 		uart_shift = 1;
69 		uart_is_pxa = 0;
70 	}
71 }
72