1 // SPDX-License-Identifier: GPL-2.0+
3 * (C) Copyright 2008 - 2015 Michal Simek <monstr@monstr.eu>
4 * Clean driver and add xilinx constant from header file
6 * (C) Copyright 2004 Atmark Techno, Inc.
7 * Yasushi SHOJI <yashi@atmark-techno.com>
14 #include <linux/bitops.h>
15 #include <linux/compiler.h>
18 #define SR_TX_FIFO_FULL BIT(3) /* transmit FIFO full */
19 #define SR_TX_FIFO_EMPTY BIT(2) /* transmit FIFO empty */
20 #define SR_RX_FIFO_VALID_DATA BIT(0) /* data in receive FIFO */
21 #define SR_RX_FIFO_FULL BIT(1) /* receive FIFO full */
23 #define ULITE_CONTROL_RST_TX 0x01
24 #define ULITE_CONTROL_RST_RX 0x02
33 struct uartlite_platdata {
34 struct uartlite *regs;
37 static int uartlite_serial_putc(struct udevice *dev, const char ch)
39 struct uartlite_platdata *plat = dev_get_platdata(dev);
40 struct uartlite *regs = plat->regs;
42 if (in_be32(®s->status) & SR_TX_FIFO_FULL)
45 out_be32(®s->tx_fifo, ch & 0xff);
50 static int uartlite_serial_getc(struct udevice *dev)
52 struct uartlite_platdata *plat = dev_get_platdata(dev);
53 struct uartlite *regs = plat->regs;
55 if (!(in_be32(®s->status) & SR_RX_FIFO_VALID_DATA))
58 return in_be32(®s->rx_fifo) & 0xff;
61 static int uartlite_serial_pending(struct udevice *dev, bool input)
63 struct uartlite_platdata *plat = dev_get_platdata(dev);
64 struct uartlite *regs = plat->regs;
67 return in_be32(®s->status) & SR_RX_FIFO_VALID_DATA;
69 return !(in_be32(®s->status) & SR_TX_FIFO_EMPTY);
72 static int uartlite_serial_probe(struct udevice *dev)
74 struct uartlite_platdata *plat = dev_get_platdata(dev);
75 struct uartlite *regs = plat->regs;
77 out_be32(®s->control, 0);
78 out_be32(®s->control, ULITE_CONTROL_RST_RX | ULITE_CONTROL_RST_TX);
79 in_be32(®s->control);
84 static int uartlite_serial_ofdata_to_platdata(struct udevice *dev)
86 struct uartlite_platdata *plat = dev_get_platdata(dev);
88 plat->regs = dev_read_addr_ptr(dev);
93 static const struct dm_serial_ops uartlite_serial_ops = {
94 .putc = uartlite_serial_putc,
95 .pending = uartlite_serial_pending,
96 .getc = uartlite_serial_getc,
99 static const struct udevice_id uartlite_serial_ids[] = {
100 { .compatible = "xlnx,opb-uartlite-1.00.b", },
101 { .compatible = "xlnx,xps-uartlite-1.00.a" },
105 U_BOOT_DRIVER(serial_uartlite) = {
106 .name = "serial_uartlite",
108 .of_match = uartlite_serial_ids,
109 .ofdata_to_platdata = uartlite_serial_ofdata_to_platdata,
110 .platdata_auto_alloc_size = sizeof(struct uartlite_platdata),
111 .probe = uartlite_serial_probe,
112 .ops = &uartlite_serial_ops,
115 #ifdef CONFIG_DEBUG_UART_UARTLITE
117 #include <debug_uart.h>
119 static inline void _debug_uart_init(void)
121 struct uartlite *regs = (struct uartlite *)CONFIG_DEBUG_UART_BASE;
123 out_be32(®s->control, 0);
124 out_be32(®s->control, ULITE_CONTROL_RST_RX | ULITE_CONTROL_RST_TX);
125 in_be32(®s->control);
128 static inline void _debug_uart_putc(int ch)
130 struct uartlite *regs = (struct uartlite *)CONFIG_DEBUG_UART_BASE;
132 while (in_be32(®s->status) & SR_TX_FIFO_FULL)
135 out_be32(®s->tx_fifo, ch & 0xff);