2 * (C) Copyright 2008 - 2015 Michal Simek <monstr@monstr.eu>
3 * Clean driver and add xilinx constant from header file
5 * (C) Copyright 2004 Atmark Techno, Inc.
6 * Yasushi SHOJI <yashi@atmark-techno.com>
8 * SPDX-License-Identifier: GPL-2.0+
15 #include <linux/compiler.h>
18 DECLARE_GLOBAL_DATA_PTR
;
20 #define SR_TX_FIFO_FULL BIT(3) /* transmit FIFO full */
21 #define SR_TX_FIFO_EMPTY BIT(2) /* transmit FIFO empty */
22 #define SR_RX_FIFO_VALID_DATA BIT(0) /* data in receive FIFO */
23 #define SR_RX_FIFO_FULL BIT(1) /* receive FIFO full */
25 #define ULITE_CONTROL_RST_TX 0x01
26 #define ULITE_CONTROL_RST_RX 0x02
35 struct uartlite_platdata
{
36 struct uartlite
*regs
;
39 static int uartlite_serial_putc(struct udevice
*dev
, const char ch
)
41 struct uartlite_platdata
*plat
= dev_get_platdata(dev
);
42 struct uartlite
*regs
= plat
->regs
;
44 if (in_be32(®s
->status
) & SR_TX_FIFO_FULL
)
47 out_be32(®s
->tx_fifo
, ch
& 0xff);
52 static int uartlite_serial_getc(struct udevice
*dev
)
54 struct uartlite_platdata
*plat
= dev_get_platdata(dev
);
55 struct uartlite
*regs
= plat
->regs
;
57 if (!(in_be32(®s
->status
) & SR_RX_FIFO_VALID_DATA
))
60 return in_be32(®s
->rx_fifo
) & 0xff;
63 static int uartlite_serial_pending(struct udevice
*dev
, bool input
)
65 struct uartlite_platdata
*plat
= dev_get_platdata(dev
);
66 struct uartlite
*regs
= plat
->regs
;
69 return in_be32(®s
->status
) & SR_RX_FIFO_VALID_DATA
;
71 return !(in_be32(®s
->status
) & SR_TX_FIFO_EMPTY
);
74 static int uartlite_serial_probe(struct udevice
*dev
)
76 struct uartlite_platdata
*plat
= dev_get_platdata(dev
);
77 struct uartlite
*regs
= plat
->regs
;
79 out_be32(®s
->control
, 0);
80 out_be32(®s
->control
, ULITE_CONTROL_RST_RX
| ULITE_CONTROL_RST_TX
);
81 in_be32(®s
->control
);
86 static int uartlite_serial_ofdata_to_platdata(struct udevice
*dev
)
88 struct uartlite_platdata
*plat
= dev_get_platdata(dev
);
90 plat
->regs
= (struct uartlite
*)dev_get_addr(dev
);
95 static const struct dm_serial_ops uartlite_serial_ops
= {
96 .putc
= uartlite_serial_putc
,
97 .pending
= uartlite_serial_pending
,
98 .getc
= uartlite_serial_getc
,
101 static const struct udevice_id uartlite_serial_ids
[] = {
102 { .compatible
= "xlnx,opb-uartlite-1.00.b", },
103 { .compatible
= "xlnx,xps-uartlite-1.00.a" },
107 U_BOOT_DRIVER(serial_uartlite
) = {
108 .name
= "serial_uartlite",
110 .of_match
= uartlite_serial_ids
,
111 .ofdata_to_platdata
= uartlite_serial_ofdata_to_platdata
,
112 .platdata_auto_alloc_size
= sizeof(struct uartlite_platdata
),
113 .probe
= uartlite_serial_probe
,
114 .ops
= &uartlite_serial_ops
,
115 .flags
= DM_FLAG_PRE_RELOC
,
118 #ifdef CONFIG_DEBUG_UART_UARTLITE
120 #include <debug_uart.h>
122 static inline void _debug_uart_init(void)
124 struct uartlite
*regs
= (struct uartlite
*)CONFIG_DEBUG_UART_BASE
;
126 out_be32(®s
->control
, 0);
127 out_be32(®s
->control
, ULITE_CONTROL_RST_RX
| ULITE_CONTROL_RST_TX
);
128 in_be32(®s
->control
);
131 static inline void _debug_uart_putc(int ch
)
133 struct uartlite
*regs
= (struct uartlite
*)CONFIG_DEBUG_UART_BASE
;
135 while (in_be32(®s
->status
) & SR_TX_FIFO_FULL
)
138 out_be32(®s
->tx_fifo
, ch
& 0xff);