2 * (c) 2007 Sascha Hauer <s.hauer@pengutronix.de>
4 * SPDX-License-Identifier: GPL-2.0+
11 #include <asm/arch/imx-regs.h>
12 #include <asm/arch/clock.h>
13 #include <dm/platform_data/serial_mxc.h>
15 #include <linux/compiler.h>
17 /* UART Control Register Bit Fields.*/
18 #define URXD_CHARRDY (1<<15)
19 #define URXD_ERR (1<<14)
20 #define URXD_OVRRUN (1<<13)
21 #define URXD_FRMERR (1<<12)
22 #define URXD_BRK (1<<11)
23 #define URXD_PRERR (1<<10)
24 #define URXD_RX_DATA (0xFF)
25 #define UCR1_ADEN (1<<15) /* Auto dectect interrupt */
26 #define UCR1_ADBR (1<<14) /* Auto detect baud rate */
27 #define UCR1_TRDYEN (1<<13) /* Transmitter ready interrupt enable */
28 #define UCR1_IDEN (1<<12) /* Idle condition interrupt */
29 #define UCR1_RRDYEN (1<<9) /* Recv ready interrupt enable */
30 #define UCR1_RDMAEN (1<<8) /* Recv ready DMA enable */
31 #define UCR1_IREN (1<<7) /* Infrared interface enable */
32 #define UCR1_TXMPTYEN (1<<6) /* Transimitter empty interrupt enable */
33 #define UCR1_RTSDEN (1<<5) /* RTS delta interrupt enable */
34 #define UCR1_SNDBRK (1<<4) /* Send break */
35 #define UCR1_TDMAEN (1<<3) /* Transmitter ready DMA enable */
36 #define UCR1_UARTCLKEN (1<<2) /* UART clock enabled */
37 #define UCR1_DOZE (1<<1) /* Doze */
38 #define UCR1_UARTEN (1<<0) /* UART enabled */
39 #define UCR2_ESCI (1<<15) /* Escape seq interrupt enable */
40 #define UCR2_IRTS (1<<14) /* Ignore RTS pin */
41 #define UCR2_CTSC (1<<13) /* CTS pin control */
42 #define UCR2_CTS (1<<12) /* Clear to send */
43 #define UCR2_ESCEN (1<<11) /* Escape enable */
44 #define UCR2_PREN (1<<8) /* Parity enable */
45 #define UCR2_PROE (1<<7) /* Parity odd/even */
46 #define UCR2_STPB (1<<6) /* Stop */
47 #define UCR2_WS (1<<5) /* Word size */
48 #define UCR2_RTSEN (1<<4) /* Request to send interrupt enable */
49 #define UCR2_TXEN (1<<2) /* Transmitter enabled */
50 #define UCR2_RXEN (1<<1) /* Receiver enabled */
51 #define UCR2_SRST (1<<0) /* SW reset */
52 #define UCR3_DTREN (1<<13) /* DTR interrupt enable */
53 #define UCR3_PARERREN (1<<12) /* Parity enable */
54 #define UCR3_FRAERREN (1<<11) /* Frame error interrupt enable */
55 #define UCR3_DSR (1<<10) /* Data set ready */
56 #define UCR3_DCD (1<<9) /* Data carrier detect */
57 #define UCR3_RI (1<<8) /* Ring indicator */
58 #define UCR3_ADNIMP (1<<7) /* Autobaud Detection Not Improved */
59 #define UCR3_RXDSEN (1<<6) /* Receive status interrupt enable */
60 #define UCR3_AIRINTEN (1<<5) /* Async IR wake interrupt enable */
61 #define UCR3_AWAKEN (1<<4) /* Async wake interrupt enable */
62 #define UCR3_REF25 (1<<3) /* Ref freq 25 MHz */
63 #define UCR3_REF30 (1<<2) /* Ref Freq 30 MHz */
64 #define UCR3_INVT (1<<1) /* Inverted Infrared transmission */
65 #define UCR3_BPEN (1<<0) /* Preset registers enable */
66 #define UCR4_CTSTL_32 (32<<10) /* CTS trigger level (32 chars) */
67 #define UCR4_INVR (1<<9) /* Inverted infrared reception */
68 #define UCR4_ENIRI (1<<8) /* Serial infrared interrupt enable */
69 #define UCR4_WKEN (1<<7) /* Wake interrupt enable */
70 #define UCR4_REF16 (1<<6) /* Ref freq 16 MHz */
71 #define UCR4_IRSC (1<<5) /* IR special case */
72 #define UCR4_TCEN (1<<3) /* Transmit complete interrupt enable */
73 #define UCR4_BKEN (1<<2) /* Break condition interrupt enable */
74 #define UCR4_OREN (1<<1) /* Receiver overrun interrupt enable */
75 #define UCR4_DREN (1<<0) /* Recv data ready interrupt enable */
76 #define UFCR_RXTL_SHF 0 /* Receiver trigger level shift */
77 #define UFCR_RFDIV (7<<7) /* Reference freq divider mask */
78 #define UFCR_RFDIV_SHF 7 /* Reference freq divider shift */
79 #define RFDIV 4 /* divide input clock by 2 */
80 #define UFCR_DCEDTE (1<<6) /* DTE mode select */
81 #define UFCR_TXTL_SHF 10 /* Transmitter trigger level shift */
82 #define USR1_PARITYERR (1<<15) /* Parity error interrupt flag */
83 #define USR1_RTSS (1<<14) /* RTS pin status */
84 #define USR1_TRDY (1<<13) /* Transmitter ready interrupt/dma flag */
85 #define USR1_RTSD (1<<12) /* RTS delta */
86 #define USR1_ESCF (1<<11) /* Escape seq interrupt flag */
87 #define USR1_FRAMERR (1<<10) /* Frame error interrupt flag */
88 #define USR1_RRDY (1<<9) /* Receiver ready interrupt/dma flag */
89 #define USR1_TIMEOUT (1<<7) /* Receive timeout interrupt status */
90 #define USR1_RXDS (1<<6) /* Receiver idle interrupt flag */
91 #define USR1_AIRINT (1<<5) /* Async IR wake interrupt flag */
92 #define USR1_AWAKE (1<<4) /* Aysnc wake interrupt flag */
93 #define USR2_ADET (1<<15) /* Auto baud rate detect complete */
94 #define USR2_TXFE (1<<14) /* Transmit buffer FIFO empty */
95 #define USR2_DTRF (1<<13) /* DTR edge interrupt flag */
96 #define USR2_IDLE (1<<12) /* Idle condition */
97 #define USR2_IRINT (1<<8) /* Serial infrared interrupt flag */
98 #define USR2_WAKE (1<<7) /* Wake */
99 #define USR2_RTSF (1<<4) /* RTS edge interrupt flag */
100 #define USR2_TXDC (1<<3) /* Transmitter complete */
101 #define USR2_BRCD (1<<2) /* Break condition */
102 #define USR2_ORE (1<<1) /* Overrun error */
103 #define USR2_RDR (1<<0) /* Recv data ready */
104 #define UTS_FRCPERR (1<<13) /* Force parity error */
105 #define UTS_LOOP (1<<12) /* Loop tx and rx */
106 #define UTS_TXEMPTY (1<<6) /* TxFIFO empty */
107 #define UTS_RXEMPTY (1<<5) /* RxFIFO empty */
108 #define UTS_TXFULL (1<<4) /* TxFIFO full */
109 #define UTS_RXFULL (1<<3) /* RxFIFO full */
110 #define UTS_SOFTRS (1<<0) /* Software reset */
111 #define TXTL 2 /* reset default */
112 #define RXTL 1 /* reset default */
114 DECLARE_GLOBAL_DATA_PTR
;
142 static void _mxc_serial_init(struct mxc_uart
*base
)
144 writel(0, &base
->cr1
);
145 writel(0, &base
->cr2
);
147 while (!(readl(&base
->cr2
) & UCR2_SRST
));
149 writel(0x704 | UCR3_ADNIMP
, &base
->cr3
);
150 writel(0x8000, &base
->cr4
);
151 writel(0x2b, &base
->esc
);
152 writel(0, &base
->tim
);
154 writel(0, &base
->ts
);
157 static void _mxc_serial_setbrg(struct mxc_uart
*base
, unsigned long clk
,
158 unsigned long baudrate
, bool use_dte
)
162 tmp
= RFDIV
<< UFCR_RFDIV_SHF
;
166 tmp
|= (TXTL
<< UFCR_TXTL_SHF
) | (RXTL
<< UFCR_RXTL_SHF
);
167 writel(tmp
, &base
->fcr
);
169 writel(0xf, &base
->bir
);
170 writel(clk
/ (2 * baudrate
), &base
->bmr
);
172 writel(UCR2_WS
| UCR2_IRTS
| UCR2_RXEN
| UCR2_TXEN
| UCR2_SRST
,
174 writel(UCR1_UARTEN
, &base
->cr1
);
177 #ifndef CONFIG_DM_SERIAL
179 #ifndef CONFIG_MXC_UART_BASE
180 #error "define CONFIG_MXC_UART_BASE to use the MXC UART driver"
183 #define mxc_base ((struct mxc_uart *)CONFIG_MXC_UART_BASE)
185 static void mxc_serial_setbrg(void)
187 u32 clk
= imx_get_uartclk();
190 gd
->baudrate
= CONFIG_BAUDRATE
;
192 _mxc_serial_setbrg(mxc_base
, clk
, gd
->baudrate
, false);
195 static int mxc_serial_getc(void)
197 while (readl(&mxc_base
->ts
) & UTS_RXEMPTY
)
199 return (readl(&mxc_base
->rxd
) & URXD_RX_DATA
); /* mask out status from upper word */
202 static void mxc_serial_putc(const char c
)
204 /* If \n, also do \r */
208 writel(c
, &mxc_base
->txd
);
210 /* wait for transmitter to be ready */
211 while (!(readl(&mxc_base
->ts
) & UTS_TXEMPTY
))
215 /* Test whether a character is in the RX buffer */
216 static int mxc_serial_tstc(void)
218 /* If receive fifo is empty, return false */
219 if (readl(&mxc_base
->ts
) & UTS_RXEMPTY
)
225 * Initialise the serial port with the given baudrate. The settings
226 * are always 8 data bits, no parity, 1 stop bit, no start bits.
228 static int mxc_serial_init(void)
230 _mxc_serial_init(mxc_base
);
237 static struct serial_device mxc_serial_drv
= {
238 .name
= "mxc_serial",
239 .start
= mxc_serial_init
,
241 .setbrg
= mxc_serial_setbrg
,
242 .putc
= mxc_serial_putc
,
243 .puts
= default_serial_puts
,
244 .getc
= mxc_serial_getc
,
245 .tstc
= mxc_serial_tstc
,
248 void mxc_serial_initialize(void)
250 serial_register(&mxc_serial_drv
);
253 __weak
struct serial_device
*default_serial_console(void)
255 return &mxc_serial_drv
;
259 #ifdef CONFIG_DM_SERIAL
261 int mxc_serial_setbrg(struct udevice
*dev
, int baudrate
)
263 struct mxc_serial_platdata
*plat
= dev
->platdata
;
264 u32 clk
= imx_get_uartclk();
266 _mxc_serial_setbrg(plat
->reg
, clk
, baudrate
, plat
->use_dte
);
271 static int mxc_serial_probe(struct udevice
*dev
)
273 struct mxc_serial_platdata
*plat
= dev
->platdata
;
275 _mxc_serial_init(plat
->reg
);
280 static int mxc_serial_getc(struct udevice
*dev
)
282 struct mxc_serial_platdata
*plat
= dev
->platdata
;
283 struct mxc_uart
*const uart
= plat
->reg
;
285 if (readl(&uart
->ts
) & UTS_RXEMPTY
)
288 return readl(&uart
->rxd
) & URXD_RX_DATA
;
291 static int mxc_serial_putc(struct udevice
*dev
, const char ch
)
293 struct mxc_serial_platdata
*plat
= dev
->platdata
;
294 struct mxc_uart
*const uart
= plat
->reg
;
296 if (!(readl(&uart
->ts
) & UTS_TXEMPTY
))
299 writel(ch
, &uart
->txd
);
304 static int mxc_serial_pending(struct udevice
*dev
, bool input
)
306 struct mxc_serial_platdata
*plat
= dev
->platdata
;
307 struct mxc_uart
*const uart
= plat
->reg
;
308 uint32_t sr2
= readl(&uart
->sr2
);
311 return sr2
& USR2_RDR
? 1 : 0;
313 return sr2
& USR2_TXDC
? 0 : 1;
316 static const struct dm_serial_ops mxc_serial_ops
= {
317 .putc
= mxc_serial_putc
,
318 .pending
= mxc_serial_pending
,
319 .getc
= mxc_serial_getc
,
320 .setbrg
= mxc_serial_setbrg
,
323 #if CONFIG_IS_ENABLED(OF_CONTROL)
324 static int mxc_serial_ofdata_to_platdata(struct udevice
*dev
)
326 struct mxc_serial_platdata
*plat
= dev
->platdata
;
329 addr
= devfdt_get_addr(dev
);
330 if (addr
== FDT_ADDR_T_NONE
)
333 plat
->reg
= (struct mxc_uart
*)addr
;
335 plat
->use_dte
= fdtdec_get_bool(gd
->fdt_blob
, dev_of_offset(dev
),
340 static const struct udevice_id mxc_serial_ids
[] = {
341 { .compatible
= "fsl,imx6ul-uart" },
342 { .compatible
= "fsl,imx7d-uart" },
347 U_BOOT_DRIVER(serial_mxc
) = {
348 .name
= "serial_mxc",
350 #if CONFIG_IS_ENABLED(OF_CONTROL)
351 .of_match
= mxc_serial_ids
,
352 .ofdata_to_platdata
= mxc_serial_ofdata_to_platdata
,
353 .platdata_auto_alloc_size
= sizeof(struct mxc_serial_platdata
),
355 .probe
= mxc_serial_probe
,
356 .ops
= &mxc_serial_ops
,
357 .flags
= DM_FLAG_PRE_RELOC
,
361 #ifdef CONFIG_DEBUG_UART_MXC
362 #include <debug_uart.h>
364 static inline void _debug_uart_init(void)
366 struct mxc_uart
*base
= (struct mxc_uart
*)CONFIG_DEBUG_UART_BASE
;
368 _mxc_serial_init(base
);
369 _mxc_serial_setbrg(base
, CONFIG_DEBUG_UART_CLOCK
,
370 CONFIG_BAUDRATE
, false);
373 static inline void _debug_uart_putc(int ch
)
375 struct mxc_uart
*base
= (struct mxc_uart
*)CONFIG_DEBUG_UART_BASE
;
377 while (!(readl(&base
->ts
) & UTS_TXEMPTY
))
380 writel(ch
, &base
->txd
);