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)20static 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)25static 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)30static 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)36static 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)50static inline void flush(void) 51 { 52 } 53 arch_decomp_setup(void)54static 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