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1 | /* |
2 | * (C) Copyright 2016 Beniamino Galvani <b.galvani@gmail.com> | |
3 | * | |
4 | * SPDX-License-Identifier: GPL-2.0+ | |
5 | */ | |
6 | ||
7 | #include <common.h> | |
8 | #include <dm.h> | |
9 | #include <errno.h> | |
10 | #include <fdtdec.h> | |
11 | #include <linux/compiler.h> | |
12 | #include <serial.h> | |
13 | ||
14 | DECLARE_GLOBAL_DATA_PTR; | |
15 | ||
16 | struct meson_uart { | |
17 | u32 wfifo; | |
18 | u32 rfifo; | |
19 | u32 control; | |
20 | u32 status; | |
21 | u32 misc; | |
22 | }; | |
23 | ||
24 | struct meson_serial_platdata { | |
25 | struct meson_uart *reg; | |
26 | }; | |
27 | ||
28 | /* AML_UART_STATUS bits */ | |
29 | #define AML_UART_PARITY_ERR BIT(16) | |
30 | #define AML_UART_FRAME_ERR BIT(17) | |
31 | #define AML_UART_TX_FIFO_WERR BIT(18) | |
32 | #define AML_UART_RX_EMPTY BIT(20) | |
33 | #define AML_UART_TX_FULL BIT(21) | |
34 | #define AML_UART_TX_EMPTY BIT(22) | |
35 | #define AML_UART_XMIT_BUSY BIT(25) | |
36 | #define AML_UART_ERR (AML_UART_PARITY_ERR | \ | |
37 | AML_UART_FRAME_ERR | \ | |
38 | AML_UART_TX_FIFO_WERR) | |
39 | ||
40 | /* AML_UART_CONTROL bits */ | |
41 | #define AML_UART_TX_EN BIT(12) | |
42 | #define AML_UART_RX_EN BIT(13) | |
43 | #define AML_UART_TX_RST BIT(22) | |
44 | #define AML_UART_RX_RST BIT(23) | |
45 | #define AML_UART_CLR_ERR BIT(24) | |
46 | ||
47 | static void meson_serial_init(struct meson_uart *uart) | |
48 | { | |
49 | u32 val; | |
50 | ||
51 | val = readl(&uart->control); | |
52 | val |= (AML_UART_RX_RST | AML_UART_TX_RST | AML_UART_CLR_ERR); | |
53 | writel(val, &uart->control); | |
54 | val &= ~(AML_UART_RX_RST | AML_UART_TX_RST | AML_UART_CLR_ERR); | |
55 | writel(val, &uart->control); | |
56 | val |= (AML_UART_RX_EN | AML_UART_TX_EN); | |
57 | writel(val, &uart->control); | |
58 | } | |
59 | ||
60 | static int meson_serial_probe(struct udevice *dev) | |
61 | { | |
62 | struct meson_serial_platdata *plat = dev->platdata; | |
63 | struct meson_uart *const uart = plat->reg; | |
64 | ||
65 | meson_serial_init(uart); | |
66 | ||
67 | return 0; | |
68 | } | |
69 | ||
70 | static int meson_serial_getc(struct udevice *dev) | |
71 | { | |
72 | struct meson_serial_platdata *plat = dev->platdata; | |
73 | struct meson_uart *const uart = plat->reg; | |
74 | ||
75 | if (readl(&uart->status) & AML_UART_RX_EMPTY) | |
76 | return -EAGAIN; | |
77 | ||
78 | return readl(&uart->rfifo) & 0xff; | |
79 | } | |
80 | ||
81 | static int meson_serial_putc(struct udevice *dev, const char ch) | |
82 | { | |
83 | struct meson_serial_platdata *plat = dev->platdata; | |
84 | struct meson_uart *const uart = plat->reg; | |
85 | ||
86 | if (readl(&uart->status) & AML_UART_TX_FULL) | |
87 | return -EAGAIN; | |
88 | ||
89 | writel(ch, &uart->wfifo); | |
90 | ||
91 | return 0; | |
92 | } | |
93 | ||
94 | static int meson_serial_pending(struct udevice *dev, bool input) | |
95 | { | |
96 | struct meson_serial_platdata *plat = dev->platdata; | |
97 | struct meson_uart *const uart = plat->reg; | |
98 | uint32_t status = readl(&uart->status); | |
99 | ||
100 | if (input) | |
101 | return !(status & AML_UART_RX_EMPTY); | |
102 | else | |
103 | return !(status & AML_UART_TX_FULL); | |
104 | } | |
105 | ||
106 | static int meson_serial_ofdata_to_platdata(struct udevice *dev) | |
107 | { | |
108 | struct meson_serial_platdata *plat = dev->platdata; | |
109 | fdt_addr_t addr; | |
110 | ||
111 | addr = dev_get_addr(dev); | |
112 | if (addr == FDT_ADDR_T_NONE) | |
113 | return -EINVAL; | |
114 | ||
115 | plat->reg = (struct meson_uart *)addr; | |
116 | ||
117 | return 0; | |
118 | } | |
119 | ||
120 | static const struct dm_serial_ops meson_serial_ops = { | |
121 | .putc = meson_serial_putc, | |
122 | .pending = meson_serial_pending, | |
123 | .getc = meson_serial_getc, | |
124 | }; | |
125 | ||
126 | static const struct udevice_id meson_serial_ids[] = { | |
127 | { .compatible = "amlogic,meson-uart" }, | |
128 | { } | |
129 | }; | |
130 | ||
131 | U_BOOT_DRIVER(serial_meson) = { | |
132 | .name = "serial_meson", | |
133 | .id = UCLASS_SERIAL, | |
134 | .of_match = meson_serial_ids, | |
135 | .probe = meson_serial_probe, | |
136 | .ops = &meson_serial_ops, | |
137 | .flags = DM_FLAG_PRE_RELOC, | |
138 | .ofdata_to_platdata = meson_serial_ofdata_to_platdata, | |
139 | .platdata_auto_alloc_size = sizeof(struct meson_serial_platdata), | |
140 | }; | |
141 | ||
142 | #ifdef CONFIG_DEBUG_UART_MESON | |
143 | ||
144 | #include <debug_uart.h> | |
145 | ||
146 | static inline void _debug_uart_init(void) | |
147 | { | |
148 | } | |
149 | ||
150 | static inline void _debug_uart_putc(int ch) | |
151 | { | |
152 | struct meson_uart *regs = (struct meson_uart *)CONFIG_DEBUG_UART_BASE; | |
153 | ||
154 | while (readl(®s->status) & AML_UART_TX_FULL) | |
155 | ; | |
156 | ||
157 | writel(ch, ®s->wfifo); | |
158 | } | |
159 | ||
160 | DEBUG_UART_FUNCS | |
161 | ||
162 | #endif |