]>
git.ipfire.org Git - people/ms/u-boot.git/blob - drivers/serial/serial_pxa.c
2 * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
5 * Wolfgang Denk, DENX Software Engineering, <wd@denx.de>
8 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
9 * Marius Groeger <mgroeger@sysgo.de>
12 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
13 * Alex Zuepke <azu@sysgo.de>
15 * Copyright (C) 1999 2000 2001 Erik Mouw (J.A.K.Mouw@its.tudelft.nl)
17 * SPDX-License-Identifier: GPL-2.0+
21 #include <asm/arch/pxa-regs.h>
22 #include <asm/arch/regs-uart.h>
24 #include <linux/compiler.h>
28 DECLARE_GLOBAL_DATA_PTR
;
31 * The numbering scheme differs here for PXA25x, PXA27x and PXA3xx so we can
32 * easily handle enabling of clock.
34 #ifdef CONFIG_CPU_MONAHANS
35 #define UART_CLK_BASE CKENA_21_BTUART
36 #define UART_CLK_REG CKENA
37 #define BTUART_INDEX 0
38 #define FFUART_INDEX 1
39 #define STUART_INDEX 2
40 #elif CONFIG_CPU_PXA25X
41 #define UART_CLK_BASE (1 << 4) /* HWUART */
42 #define UART_CLK_REG CKEN
43 #define HWUART_INDEX 0
44 #define STUART_INDEX 1
45 #define FFUART_INDEX 2
46 #define BTUART_INDEX 3
48 #define UART_CLK_BASE CKEN5_STUART
49 #define UART_CLK_REG CKEN
50 #define STUART_INDEX 0
51 #define FFUART_INDEX 1
52 #define BTUART_INDEX 2
56 * Only PXA250 has HWUART, to avoid poluting the code with more macros,
57 * artificially introduce this.
59 #ifndef CONFIG_CPU_PXA25X
60 #define HWUART_INDEX 0xff
63 static uint32_t pxa_uart_get_baud_divider(void)
65 if (gd
->baudrate
== 1200)
67 else if (gd
->baudrate
== 9600)
69 else if (gd
->baudrate
== 19200)
71 else if (gd
->baudrate
== 38400)
73 else if (gd
->baudrate
== 57600)
75 else if (gd
->baudrate
== 115200)
77 else /* Unsupported baudrate */
81 static struct pxa_uart_regs
*pxa_uart_index_to_regs(uint32_t uart_index
)
84 case FFUART_INDEX
: return (struct pxa_uart_regs
*)FFUART_BASE
;
85 case BTUART_INDEX
: return (struct pxa_uart_regs
*)BTUART_BASE
;
86 case STUART_INDEX
: return (struct pxa_uart_regs
*)STUART_BASE
;
87 case HWUART_INDEX
: return (struct pxa_uart_regs
*)HWUART_BASE
;
93 static void pxa_uart_toggle_clock(uint32_t uart_index
, int enable
)
95 uint32_t clk_reg
, clk_offset
, reg
;
97 clk_reg
= UART_CLK_REG
;
98 clk_offset
= UART_CLK_BASE
<< uart_index
;
100 reg
= readl(clk_reg
);
107 writel(reg
, clk_reg
);
111 * Enable clock and set baud rate, parity etc.
113 void pxa_setbrg_dev(uint32_t uart_index
)
115 uint32_t divider
= 0;
116 struct pxa_uart_regs
*uart_regs
;
118 divider
= pxa_uart_get_baud_divider();
122 uart_regs
= pxa_uart_index_to_regs(uart_index
);
126 pxa_uart_toggle_clock(uart_index
, 1);
128 /* Disable interrupts and FIFOs */
129 writel(0, &uart_regs
->ier
);
130 writel(0, &uart_regs
->fcr
);
133 writel(LCR_WLS0
| LCR_WLS1
| LCR_DLAB
, &uart_regs
->lcr
);
134 writel(divider
& 0xff, &uart_regs
->dll
);
135 writel(divider
>> 8, &uart_regs
->dlh
);
136 writel(LCR_WLS0
| LCR_WLS1
, &uart_regs
->lcr
);
139 writel(IER_UUE
, &uart_regs
->ier
);
143 * Initialise the serial port with the given baudrate. The settings
144 * are always 8 data bits, no parity, 1 stop bit, no start bits.
146 int pxa_init_dev(unsigned int uart_index
)
148 pxa_setbrg_dev (uart_index
);
153 * Output a single byte to the serial port.
155 void pxa_putc_dev(unsigned int uart_index
, const char c
)
157 struct pxa_uart_regs
*uart_regs
;
159 /* If \n, also do \r */
161 pxa_putc_dev(uart_index
, '\r');
163 uart_regs
= pxa_uart_index_to_regs(uart_index
);
167 while (!(readl(&uart_regs
->lsr
) & LSR_TEMT
))
169 writel(c
, &uart_regs
->thr
);
173 * Read a single byte from the serial port. Returns 1 on success, 0
174 * otherwise. When the function is succesfull, the character read is
175 * written into its argument c.
177 int pxa_tstc_dev(unsigned int uart_index
)
179 struct pxa_uart_regs
*uart_regs
;
181 uart_regs
= pxa_uart_index_to_regs(uart_index
);
185 return readl(&uart_regs
->lsr
) & LSR_DR
;
189 * Read a single byte from the serial port. Returns 1 on success, 0
190 * otherwise. When the function is succesfull, the character read is
191 * written into its argument c.
193 int pxa_getc_dev(unsigned int uart_index
)
195 struct pxa_uart_regs
*uart_regs
;
197 uart_regs
= pxa_uart_index_to_regs(uart_index
);
201 while (!(readl(&uart_regs
->lsr
) & LSR_DR
))
203 return readl(&uart_regs
->rbr
) & 0xff;
206 void pxa_puts_dev(unsigned int uart_index
, const char *s
)
209 pxa_putc_dev(uart_index
, *s
++);
212 #define pxa_uart(uart, UART) \
213 int uart##_init(void) \
215 return pxa_init_dev(UART##_INDEX); \
218 void uart##_setbrg(void) \
220 return pxa_setbrg_dev(UART##_INDEX); \
223 void uart##_putc(const char c) \
225 return pxa_putc_dev(UART##_INDEX, c); \
228 void uart##_puts(const char *s) \
230 return pxa_puts_dev(UART##_INDEX, s); \
233 int uart##_getc(void) \
235 return pxa_getc_dev(UART##_INDEX); \
238 int uart##_tstc(void) \
240 return pxa_tstc_dev(UART##_INDEX); \
243 #define pxa_uart_desc(uart) \
244 struct serial_device serial_##uart##_device = \
246 .name = "serial_"#uart, \
247 .start = uart##_init, \
249 .setbrg = uart##_setbrg, \
250 .getc = uart##_getc, \
251 .tstc = uart##_tstc, \
252 .putc = uart##_putc, \
253 .puts = uart##_puts, \
256 #define pxa_uart_multi(uart, UART) \
257 pxa_uart(uart, UART) \
260 #if defined(CONFIG_HWUART)
261 pxa_uart_multi(hwuart
, HWUART
)
263 #if defined(CONFIG_STUART)
264 pxa_uart_multi(stuart
, STUART
)
266 #if defined(CONFIG_FFUART)
267 pxa_uart_multi(ffuart
, FFUART
)
269 #if defined(CONFIG_BTUART)
270 pxa_uart_multi(btuart
, BTUART
)
273 __weak
struct serial_device
*default_serial_console(void)
275 #if CONFIG_CONS_INDEX == 1
276 return &serial_hwuart_device
;
277 #elif CONFIG_CONS_INDEX == 2
278 return &serial_stuart_device
;
279 #elif CONFIG_CONS_INDEX == 3
280 return &serial_ffuart_device
;
281 #elif CONFIG_CONS_INDEX == 4
282 return &serial_btuart_device
;
284 #error "Bad CONFIG_CONS_INDEX."
288 void pxa_serial_initialize(void)
290 #if defined(CONFIG_FFUART)
291 serial_register(&serial_ffuart_device
);
293 #if defined(CONFIG_BTUART)
294 serial_register(&serial_btuart_device
);
296 #if defined(CONFIG_STUART)
297 serial_register(&serial_stuart_device
);