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 <log.h>
13 #include <ns16550.h>
14 #include <serial.h>
15 #include <clk.h>
16 #include <linux/err.h>
17
18 #ifndef CONFIG_SYS_NS16550_CLK
19 #define CONFIG_SYS_NS16550_CLK 0
20 #endif
21
22 #ifdef CONFIG_DEBUG_UART_OMAP
23
24 #ifndef CONFIG_SYS_NS16550_IER
25 #define CONFIG_SYS_NS16550_IER 0x00
26 #endif
27
28 #define UART_MCRVAL 0x00
29 #define UART_LCRVAL UART_LCR_8N1
30
serial_out_shift(void * addr,int shift,int value)31 static 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
serial_in_shift(void * addr,int shift)48 static 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
_debug_uart_init(void)67 static inline void _debug_uart_init(void)
68 {
69 struct ns16550 *com_port = (struct ns16550 *)CONFIG_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, CONFIG_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
_debug_uart_putc(int ch)86 static inline void _debug_uart_putc(int ch)
87 {
88 struct ns16550 *com_port = (struct ns16550 *)CONFIG_DEBUG_UART_BASE;
89
90 while (!(serial_din(&com_port->lsr) & UART_LSR_THRE))
91 ;
92 serial_dout(&com_port->thr, ch);
93 }
94
95 DEBUG_UART_FUNCS
96
97 #endif
98
99 #if CONFIG_IS_ENABLED(DM_SERIAL)
100
101 #if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
omap_serial_of_to_plat(struct udevice * dev)102 static 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 CONFIG_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
142 static 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_CONTROL && !OF_PLATDATA */
153
154 #if CONFIG_IS_ENABLED(SERIAL_PRESENT)
155 U_BOOT_DRIVER(omap_serial) = {
156 .name = "omap_serial",
157 .id = UCLASS_SERIAL,
158 #if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
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