1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Texas Instruments' OMAP serial driver
4 *
5 * Copyright (C) 2018 Texas Instruments Incorporated - http://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 <ns16550.h>
13 #include <serial.h>
14 #include <clk.h>
15
16 #ifndef CONFIG_SYS_NS16550_CLK
17 #define CONFIG_SYS_NS16550_CLK 0
18 #endif
19
20 #ifdef CONFIG_DEBUG_UART_OMAP
21
22 #ifndef CONFIG_SYS_NS16550_IER
23 #define CONFIG_SYS_NS16550_IER 0x00
24 #endif
25
26 #define UART_MCRVAL 0x00
27 #define UART_LCRVAL UART_LCR_8N1
28
serial_out_shift(void * addr,int shift,int value)29 static inline void serial_out_shift(void *addr, int shift, int value)
30 {
31 #ifdef CONFIG_SYS_NS16550_PORT_MAPPED
32 outb(value, (ulong)addr);
33 #elif defined(CONFIG_SYS_NS16550_MEM32) && defined(CONFIG_SYS_LITTLE_ENDIAN)
34 out_le32(addr, value);
35 #elif defined(CONFIG_SYS_NS16550_MEM32) && defined(CONFIG_SYS_BIG_ENDIAN)
36 out_be32(addr, value);
37 #elif defined(CONFIG_SYS_NS16550_MEM32)
38 writel(value, addr);
39 #elif defined(CONFIG_SYS_BIG_ENDIAN)
40 writeb(value, addr + (1 << shift) - 1);
41 #else
42 writeb(value, addr);
43 #endif
44 }
45
serial_in_shift(void * addr,int shift)46 static inline int serial_in_shift(void *addr, int shift)
47 {
48 #ifdef CONFIG_SYS_NS16550_PORT_MAPPED
49 return inb((ulong)addr);
50 #elif defined(CONFIG_SYS_NS16550_MEM32) && defined(CONFIG_SYS_LITTLE_ENDIAN)
51 return in_le32(addr);
52 #elif defined(CONFIG_SYS_NS16550_MEM32) && defined(CONFIG_SYS_BIG_ENDIAN)
53 return in_be32(addr);
54 #elif defined(CONFIG_SYS_NS16550_MEM32)
55 return readl(addr);
56 #elif defined(CONFIG_SYS_BIG_ENDIAN)
57 return readb(addr + (1 << shift) - 1);
58 #else
59 return readb(addr);
60 #endif
61 }
62
63 #include <debug_uart.h>
64
_debug_uart_init(void)65 static inline void _debug_uart_init(void)
66 {
67 struct NS16550 *com_port = (struct NS16550 *)CONFIG_DEBUG_UART_BASE;
68 int baud_divisor;
69
70 baud_divisor = ns16550_calc_divisor(com_port, CONFIG_DEBUG_UART_CLOCK,
71 CONFIG_BAUDRATE);
72 serial_dout(&com_port->ier, CONFIG_SYS_NS16550_IER);
73 serial_dout(&com_port->mdr1, 0x7);
74 serial_dout(&com_port->mcr, UART_MCRVAL);
75 serial_dout(&com_port->fcr, UART_FCR_DEFVAL);
76
77 serial_dout(&com_port->lcr, UART_LCR_BKSE | UART_LCRVAL);
78 serial_dout(&com_port->dll, baud_divisor & 0xff);
79 serial_dout(&com_port->dlm, (baud_divisor >> 8) & 0xff);
80 serial_dout(&com_port->lcr, UART_LCRVAL);
81 serial_dout(&com_port->mdr1, 0x0);
82 }
83
_debug_uart_putc(int ch)84 static inline void _debug_uart_putc(int ch)
85 {
86 struct NS16550 *com_port = (struct NS16550 *)CONFIG_DEBUG_UART_BASE;
87
88 while (!(serial_din(&com_port->lsr) & UART_LSR_THRE))
89 ;
90 serial_dout(&com_port->thr, ch);
91 }
92
93 DEBUG_UART_FUNCS
94
95 #endif
96
97 #if CONFIG_IS_ENABLED(DM_SERIAL)
98
99 #if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
omap_serial_ofdata_to_platdata(struct udevice * dev)100 static int omap_serial_ofdata_to_platdata(struct udevice *dev)
101 {
102 struct ns16550_platdata *plat = dev->platdata;
103 fdt_addr_t addr;
104 struct clk clk;
105 int err;
106
107 /* try Processor Local Bus device first */
108 addr = dev_read_addr(dev);
109 if (addr == FDT_ADDR_T_NONE)
110 return -EINVAL;
111
112 plat->base = (unsigned long)map_physmem(addr, 0, MAP_NOCACHE);
113
114 plat->reg_offset = dev_read_u32_default(dev, "reg-offset", 0);
115 plat->reg_shift = 2;
116
117 err = clk_get_by_index(dev, 0, &clk);
118 if (!err) {
119 err = clk_get_rate(&clk);
120 if (!IS_ERR_VALUE(err))
121 plat->clock = err;
122 } else if (err != -ENOENT && err != -ENODEV && err != -ENOSYS) {
123 debug("omap serial failed to get clock\n");
124 return err;
125 }
126
127 if (!plat->clock)
128 plat->clock = dev_read_u32_default(dev, "clock-frequency",
129 CONFIG_SYS_NS16550_CLK);
130 if (!plat->clock) {
131 debug("omap serial clock not defined\n");
132 return -EINVAL;
133 }
134
135 plat->fcr = UART_FCR_DEFVAL;
136
137 return 0;
138 }
139
140 static const struct udevice_id omap_serial_ids[] = {
141 { .compatible = "ti,omap2-uart", },
142 { .compatible = "ti,omap3-uart", },
143 { .compatible = "ti,omap4-uart", },
144 { .compatible = "ti,am3352-uart", },
145 { .compatible = "ti,am4372-uart", },
146 { .compatible = "ti,dra742-uart", },
147 { .compatible = "ti,am654-uart", },
148 {}
149 };
150 #endif /* OF_CONTROL && !OF_PLATDATA */
151
152 #if CONFIG_IS_ENABLED(SERIAL_PRESENT)
153 U_BOOT_DRIVER(omap_serial) = {
154 .name = "omap_serial",
155 .id = UCLASS_SERIAL,
156 #if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
157 .of_match = omap_serial_ids,
158 .ofdata_to_platdata = omap_serial_ofdata_to_platdata,
159 .platdata_auto_alloc_size = sizeof(struct ns16550_platdata),
160 #endif
161 .priv_auto_alloc_size = sizeof(struct NS16550),
162 .probe = ns16550_serial_probe,
163 .ops = &ns16550_serial_ops,
164 #if !CONFIG_IS_ENABLED(OF_CONTROL)
165 .flags = DM_FLAG_PRE_RELOC,
166 #endif
167 };
168 #endif
169 #endif /* DM_SERIAL */
170