1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Texas Instruments' OMAP serial driver
4 *
5 * Copyright (C) 2018 Texas Instruments Incorporated - https://www.ti.com/
6 *	Lokesh Vutla <lokeshvutla@ti.com>
7 */
8
9#include <common.h>
10#include <dm.h>
11#include <dt-structs.h>
12#include <log.h>
13#include <ns16550.h>
14#include <serial.h>
15#include <clk.h>
16#include <linux/err.h>
17
18#ifndef CFG_SYS_NS16550_CLK
19#define CFG_SYS_NS16550_CLK  0
20#endif
21
22#ifdef CONFIG_DEBUG_UART_OMAP
23
24#ifndef CFG_SYS_NS16550_IER
25#define CFG_SYS_NS16550_IER  0x00
26#endif
27
28#define UART_MCRVAL 0x00
29#define UART_LCRVAL UART_LCR_8N1
30
31static inline void serial_out_shift(void *addr, int shift, int value)
32{
33#ifdef CONFIG_SYS_NS16550_PORT_MAPPED
34	outb(value, (ulong)addr);
35#elif defined(CONFIG_SYS_NS16550_MEM32) && defined(CONFIG_SYS_LITTLE_ENDIAN)
36	out_le32(addr, value);
37#elif defined(CONFIG_SYS_NS16550_MEM32) && defined(CONFIG_SYS_BIG_ENDIAN)
38	out_be32(addr, value);
39#elif defined(CONFIG_SYS_NS16550_MEM32)
40	writel(value, addr);
41#elif defined(CONFIG_SYS_BIG_ENDIAN)
42	writeb(value, addr + (1 << shift) - 1);
43#else
44	writeb(value, addr);
45#endif
46}
47
48static inline int serial_in_shift(void *addr, int shift)
49{
50#ifdef CONFIG_SYS_NS16550_PORT_MAPPED
51	return inb((ulong)addr);
52#elif defined(CONFIG_SYS_NS16550_MEM32) && defined(CONFIG_SYS_LITTLE_ENDIAN)
53	return in_le32(addr);
54#elif defined(CONFIG_SYS_NS16550_MEM32) && defined(CONFIG_SYS_BIG_ENDIAN)
55	return in_be32(addr);
56#elif defined(CONFIG_SYS_NS16550_MEM32)
57	return readl(addr);
58#elif defined(CONFIG_SYS_BIG_ENDIAN)
59	return readb(addr + (1 << shift) - 1);
60#else
61	return readb(addr);
62#endif
63}
64
65#include <debug_uart.h>
66
67static inline void _debug_uart_init(void)
68{
69	struct ns16550 *com_port = (struct ns16550 *)CONFIG_VAL(DEBUG_UART_BASE);
70	int baud_divisor;
71
72	baud_divisor = ns16550_calc_divisor(com_port, CONFIG_DEBUG_UART_CLOCK,
73					    CONFIG_BAUDRATE);
74	serial_dout(&com_port->ier, CFG_SYS_NS16550_IER);
75	serial_dout(&com_port->mdr1, 0x7);
76	serial_dout(&com_port->mcr, UART_MCRVAL);
77	serial_dout(&com_port->fcr, UART_FCR_DEFVAL);
78
79	serial_dout(&com_port->lcr, UART_LCR_BKSE | UART_LCRVAL);
80	serial_dout(&com_port->dll, baud_divisor & 0xff);
81	serial_dout(&com_port->dlm, (baud_divisor >> 8) & 0xff);
82	serial_dout(&com_port->lcr, UART_LCRVAL);
83	serial_dout(&com_port->mdr1, 0x0);
84}
85
86static inline void _debug_uart_putc(int ch)
87{
88	struct ns16550 *com_port = (struct ns16550 *)CONFIG_VAL(DEBUG_UART_BASE);
89
90	while (!(serial_din(&com_port->lsr) & UART_LSR_THRE))
91		;
92	serial_dout(&com_port->thr, ch);
93}
94
95DEBUG_UART_FUNCS
96
97#endif
98
99#if CONFIG_IS_ENABLED(DM_SERIAL)
100
101#if CONFIG_IS_ENABLED(OF_REAL)
102static int omap_serial_of_to_plat(struct udevice *dev)
103{
104	struct ns16550_plat *plat = dev_get_plat(dev);
105	fdt_addr_t addr;
106	struct clk clk;
107	int err;
108
109	/* try Processor Local Bus device first */
110	addr = dev_read_addr(dev);
111	if (addr == FDT_ADDR_T_NONE)
112		return -EINVAL;
113
114	plat->base = (unsigned long)map_physmem(addr, 0, MAP_NOCACHE);
115
116	plat->reg_offset = dev_read_u32_default(dev, "reg-offset", 0);
117	plat->reg_shift = 2;
118
119	err = clk_get_by_index(dev, 0, &clk);
120	if (!err) {
121		err = clk_get_rate(&clk);
122		if (!IS_ERR_VALUE(err))
123			plat->clock = err;
124	} else if (err != -ENOENT && err != -ENODEV && err != -ENOSYS) {
125		debug("omap serial failed to get clock\n");
126		return err;
127	}
128
129	if (!plat->clock)
130		plat->clock = dev_read_u32_default(dev, "clock-frequency",
131						   CFG_SYS_NS16550_CLK);
132	if (!plat->clock) {
133		debug("omap serial clock not defined\n");
134		return -EINVAL;
135	}
136
137	plat->fcr = UART_FCR_DEFVAL;
138
139	return 0;
140}
141
142static const struct udevice_id omap_serial_ids[] = {
143	{ .compatible = "ti,omap2-uart", },
144	{ .compatible = "ti,omap3-uart", },
145	{ .compatible = "ti,omap4-uart", },
146	{ .compatible = "ti,am3352-uart", },
147	{ .compatible = "ti,am4372-uart", },
148	{ .compatible = "ti,dra742-uart", },
149	{ .compatible = "ti,am654-uart", },
150	{}
151};
152#endif /* OF_REAL */
153
154#if CONFIG_IS_ENABLED(SERIAL_PRESENT)
155U_BOOT_DRIVER(omap_serial) = {
156	.name	= "omap_serial",
157	.id	= UCLASS_SERIAL,
158#if CONFIG_IS_ENABLED(OF_REAL)
159	.of_match = omap_serial_ids,
160	.of_to_plat = omap_serial_of_to_plat,
161	.plat_auto	= sizeof(struct ns16550_plat),
162#endif
163	.priv_auto	= sizeof(struct ns16550),
164	.probe = ns16550_serial_probe,
165	.ops	= &ns16550_serial_ops,
166#if !CONFIG_IS_ENABLED(OF_CONTROL)
167	.flags	= DM_FLAG_PRE_RELOC,
168#endif
169};
170#endif
171#endif /* DM_SERIAL */
172