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 * Modified to add driver model (DM) support
18 * (C) Copyright 2016 Marcel Ziswiler <marcel.ziswiler@toradex.com>
20 * SPDX-License-Identifier: GPL-2.0+
24 #include <asm/arch/pxa-regs.h>
25 #include <asm/arch/regs-uart.h>
28 #include <dm/platform_data/serial_pxa.h>
29 #include <linux/compiler.h>
33 DECLARE_GLOBAL_DATA_PTR
;
35 static uint32_t pxa_uart_get_baud_divider(int baudrate
)
37 return 921600 / baudrate
;
40 static void pxa_uart_toggle_clock(uint32_t uart_index
, int enable
)
42 uint32_t clk_reg
, clk_offset
, reg
;
44 clk_reg
= UART_CLK_REG
;
45 clk_offset
= UART_CLK_BASE
<< uart_index
;
58 * Enable clock and set baud rate, parity etc.
60 void pxa_setbrg_common(struct pxa_uart_regs
*uart_regs
, int port
, int baudrate
)
62 uint32_t divider
= pxa_uart_get_baud_divider(baudrate
);
67 pxa_uart_toggle_clock(port
, 1);
69 /* Disable interrupts and FIFOs */
70 writel(0, &uart_regs
->ier
);
71 writel(0, &uart_regs
->fcr
);
74 writel(LCR_WLS0
| LCR_WLS1
| LCR_DLAB
, &uart_regs
->lcr
);
75 writel(divider
& 0xff, &uart_regs
->dll
);
76 writel(divider
>> 8, &uart_regs
->dlh
);
77 writel(LCR_WLS0
| LCR_WLS1
, &uart_regs
->lcr
);
80 writel(IER_UUE
, &uart_regs
->ier
);
83 #ifndef CONFIG_DM_SERIAL
84 static struct pxa_uart_regs
*pxa_uart_index_to_regs(uint32_t uart_index
)
87 case FFUART_INDEX
: return (struct pxa_uart_regs
*)FFUART_BASE
;
88 case BTUART_INDEX
: return (struct pxa_uart_regs
*)BTUART_BASE
;
89 case STUART_INDEX
: return (struct pxa_uart_regs
*)STUART_BASE
;
90 case HWUART_INDEX
: return (struct pxa_uart_regs
*)HWUART_BASE
;
97 * Enable clock and set baud rate, parity etc.
99 void pxa_setbrg_dev(uint32_t uart_index
)
101 struct pxa_uart_regs
*uart_regs
= pxa_uart_index_to_regs(uart_index
);
103 panic("Failed getting UART registers\n");
105 pxa_setbrg_common(uart_regs
, uart_index
, gd
->baudrate
);
109 * Initialise the serial port with the given baudrate. The settings
110 * are always 8 data bits, no parity, 1 stop bit, no start bits.
112 int pxa_init_dev(unsigned int uart_index
)
114 pxa_setbrg_dev(uart_index
);
119 * Output a single byte to the serial port.
121 void pxa_putc_dev(unsigned int uart_index
, const char c
)
123 struct pxa_uart_regs
*uart_regs
;
125 /* If \n, also do \r */
127 pxa_putc_dev(uart_index
, '\r');
129 uart_regs
= pxa_uart_index_to_regs(uart_index
);
133 while (!(readl(&uart_regs
->lsr
) & LSR_TEMT
))
135 writel(c
, &uart_regs
->thr
);
139 * Read a single byte from the serial port. Returns 1 on success, 0
140 * otherwise. When the function is succesfull, the character read is
141 * written into its argument c.
143 int pxa_tstc_dev(unsigned int uart_index
)
145 struct pxa_uart_regs
*uart_regs
;
147 uart_regs
= pxa_uart_index_to_regs(uart_index
);
151 return readl(&uart_regs
->lsr
) & LSR_DR
;
155 * Read a single byte from the serial port. Returns 1 on success, 0
156 * otherwise. When the function is succesfull, the character read is
157 * written into its argument c.
159 int pxa_getc_dev(unsigned int uart_index
)
161 struct pxa_uart_regs
*uart_regs
;
163 uart_regs
= pxa_uart_index_to_regs(uart_index
);
167 while (!(readl(&uart_regs
->lsr
) & LSR_DR
))
169 return readl(&uart_regs
->rbr
) & 0xff;
172 void pxa_puts_dev(unsigned int uart_index
, const char *s
)
175 pxa_putc_dev(uart_index
, *s
++);
178 #define pxa_uart(uart, UART) \
179 int uart##_init(void) \
181 return pxa_init_dev(UART##_INDEX); \
184 void uart##_setbrg(void) \
186 return pxa_setbrg_dev(UART##_INDEX); \
189 void uart##_putc(const char c) \
191 return pxa_putc_dev(UART##_INDEX, c); \
194 void uart##_puts(const char *s) \
196 return pxa_puts_dev(UART##_INDEX, s); \
199 int uart##_getc(void) \
201 return pxa_getc_dev(UART##_INDEX); \
204 int uart##_tstc(void) \
206 return pxa_tstc_dev(UART##_INDEX); \
209 #define pxa_uart_desc(uart) \
210 struct serial_device serial_##uart##_device = \
212 .name = "serial_"#uart, \
213 .start = uart##_init, \
215 .setbrg = uart##_setbrg, \
216 .getc = uart##_getc, \
217 .tstc = uart##_tstc, \
218 .putc = uart##_putc, \
219 .puts = uart##_puts, \
222 #define pxa_uart_multi(uart, UART) \
223 pxa_uart(uart, UART) \
226 #if defined(CONFIG_HWUART)
227 pxa_uart_multi(hwuart
, HWUART
)
229 #if defined(CONFIG_STUART)
230 pxa_uart_multi(stuart
, STUART
)
232 #if defined(CONFIG_FFUART)
233 pxa_uart_multi(ffuart
, FFUART
)
235 #if defined(CONFIG_BTUART)
236 pxa_uart_multi(btuart
, BTUART
)
239 __weak
struct serial_device
*default_serial_console(void)
241 #if CONFIG_CONS_INDEX == 1
242 return &serial_hwuart_device
;
243 #elif CONFIG_CONS_INDEX == 2
244 return &serial_stuart_device
;
245 #elif CONFIG_CONS_INDEX == 3
246 return &serial_ffuart_device
;
247 #elif CONFIG_CONS_INDEX == 4
248 return &serial_btuart_device
;
250 #error "Bad CONFIG_CONS_INDEX."
254 void pxa_serial_initialize(void)
256 #if defined(CONFIG_FFUART)
257 serial_register(&serial_ffuart_device
);
259 #if defined(CONFIG_BTUART)
260 serial_register(&serial_btuart_device
);
262 #if defined(CONFIG_STUART)
263 serial_register(&serial_stuart_device
);
266 #endif /* CONFIG_DM_SERIAL */
268 #ifdef CONFIG_DM_SERIAL
269 static int pxa_serial_probe(struct udevice
*dev
)
271 struct pxa_serial_platdata
*plat
= dev
->platdata
;
273 pxa_setbrg_common((struct pxa_uart_regs
*)plat
->base
, plat
->port
,
278 static int pxa_serial_putc(struct udevice
*dev
, const char ch
)
280 struct pxa_serial_platdata
*plat
= dev
->platdata
;
281 struct pxa_uart_regs
*uart_regs
= (struct pxa_uart_regs
*)plat
->base
;
283 /* Wait for last character to go. */
284 if (!(readl(&uart_regs
->lsr
) & LSR_TEMT
))
287 writel(ch
, &uart_regs
->thr
);
292 static int pxa_serial_getc(struct udevice
*dev
)
294 struct pxa_serial_platdata
*plat
= dev
->platdata
;
295 struct pxa_uart_regs
*uart_regs
= (struct pxa_uart_regs
*)plat
->base
;
297 /* Wait for a character to arrive. */
298 if (!(readl(&uart_regs
->lsr
) & LSR_DR
))
301 return readl(&uart_regs
->rbr
) & 0xff;
304 int pxa_serial_setbrg(struct udevice
*dev
, int baudrate
)
306 struct pxa_serial_platdata
*plat
= dev
->platdata
;
307 struct pxa_uart_regs
*uart_regs
= (struct pxa_uart_regs
*)plat
->base
;
308 int port
= plat
->port
;
310 pxa_setbrg_common(uart_regs
, port
, baudrate
);
315 static int pxa_serial_pending(struct udevice
*dev
, bool input
)
317 struct pxa_serial_platdata
*plat
= dev
->platdata
;
318 struct pxa_uart_regs
*uart_regs
= (struct pxa_uart_regs
*)plat
->base
;
321 return readl(&uart_regs
->lsr
) & LSR_DR
? 1 : 0;
323 return readl(&uart_regs
->lsr
) & LSR_TEMT
? 0 : 1;
328 static const struct dm_serial_ops pxa_serial_ops
= {
329 .putc
= pxa_serial_putc
,
330 .pending
= pxa_serial_pending
,
331 .getc
= pxa_serial_getc
,
332 .setbrg
= pxa_serial_setbrg
,
335 U_BOOT_DRIVER(serial_pxa
) = {
336 .name
= "serial_pxa",
338 .probe
= pxa_serial_probe
,
339 .ops
= &pxa_serial_ops
,
340 .flags
= DM_FLAG_PRE_RELOC
,
342 #endif /* CONFIG_DM_SERIAL */