]>
Commit | Line | Data |
---|---|---|
d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
d4a67d9d | 2 | /* |
0bd3acdf | 3 | * Atheros AR7XXX/AR9XXX SoC early printk support |
d4a67d9d | 4 | * |
0bd3acdf | 5 | * Copyright (C) 2008-2011 Gabor Juhos <juhosg@openwrt.org> |
d4a67d9d | 6 | * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org> |
d4a67d9d GJ |
7 | */ |
8 | ||
9 | #include <linux/io.h> | |
0bd3acdf | 10 | #include <linux/errno.h> |
d4a67d9d GJ |
11 | #include <linux/serial_reg.h> |
12 | #include <asm/addrspace.h> | |
5c93316c | 13 | #include <asm/setup.h> |
d4a67d9d | 14 | |
0bd3acdf | 15 | #include <asm/mach-ath79/ath79.h> |
d4a67d9d | 16 | #include <asm/mach-ath79/ar71xx_regs.h> |
0bd3acdf | 17 | #include <asm/mach-ath79/ar933x_uart.h> |
d4a67d9d | 18 | |
5c93316c | 19 | static void (*_prom_putchar)(char); |
0bd3acdf GJ |
20 | |
21 | static inline void prom_putchar_wait(void __iomem *reg, u32 mask, u32 val) | |
d4a67d9d | 22 | { |
0bd3acdf | 23 | u32 t; |
d4a67d9d GJ |
24 | |
25 | do { | |
0bd3acdf GJ |
26 | t = __raw_readl(reg); |
27 | if ((t & mask) == val) | |
d4a67d9d GJ |
28 | break; |
29 | } while (1); | |
30 | } | |
31 | ||
f5b556c9 MS |
32 | #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE) |
33 | ||
5c93316c | 34 | static void prom_putchar_ar71xx(char ch) |
d4a67d9d GJ |
35 | { |
36 | void __iomem *base = (void __iomem *)(KSEG1ADDR(AR71XX_UART_BASE)); | |
37 | ||
f5b556c9 | 38 | prom_putchar_wait(base + UART_LSR * 4, BOTH_EMPTY, BOTH_EMPTY); |
5c93316c | 39 | __raw_writel((unsigned char)ch, base + UART_TX * 4); |
f5b556c9 | 40 | prom_putchar_wait(base + UART_LSR * 4, BOTH_EMPTY, BOTH_EMPTY); |
0bd3acdf GJ |
41 | } |
42 | ||
5c93316c | 43 | static void prom_putchar_ar933x(char ch) |
0bd3acdf GJ |
44 | { |
45 | void __iomem *base = (void __iomem *)(KSEG1ADDR(AR933X_UART_BASE)); | |
46 | ||
47 | prom_putchar_wait(base + AR933X_UART_DATA_REG, AR933X_UART_DATA_TX_CSR, | |
48 | AR933X_UART_DATA_TX_CSR); | |
5c93316c AS |
49 | __raw_writel(AR933X_UART_DATA_TX_CSR | (unsigned char)ch, |
50 | base + AR933X_UART_DATA_REG); | |
0bd3acdf GJ |
51 | prom_putchar_wait(base + AR933X_UART_DATA_REG, AR933X_UART_DATA_TX_CSR, |
52 | AR933X_UART_DATA_TX_CSR); | |
53 | } | |
54 | ||
5c93316c | 55 | static void prom_putchar_dummy(char ch) |
0bd3acdf GJ |
56 | { |
57 | /* nothing to do */ | |
58 | } | |
59 | ||
ffc20581 GJ |
60 | static void prom_enable_uart(u32 id) |
61 | { | |
62 | void __iomem *gpio_base; | |
63 | u32 uart_en; | |
64 | u32 t; | |
65 | ||
66 | switch (id) { | |
67 | case REV_ID_MAJOR_AR71XX: | |
68 | uart_en = AR71XX_GPIO_FUNC_UART_EN; | |
69 | break; | |
70 | ||
71 | case REV_ID_MAJOR_AR7240: | |
72 | case REV_ID_MAJOR_AR7241: | |
73 | case REV_ID_MAJOR_AR7242: | |
74 | uart_en = AR724X_GPIO_FUNC_UART_EN; | |
75 | break; | |
76 | ||
77 | case REV_ID_MAJOR_AR913X: | |
78 | uart_en = AR913X_GPIO_FUNC_UART_EN; | |
79 | break; | |
80 | ||
81 | case REV_ID_MAJOR_AR9330: | |
82 | case REV_ID_MAJOR_AR9331: | |
83 | uart_en = AR933X_GPIO_FUNC_UART_EN; | |
84 | break; | |
85 | ||
86 | case REV_ID_MAJOR_AR9341: | |
87 | case REV_ID_MAJOR_AR9342: | |
88 | case REV_ID_MAJOR_AR9344: | |
89 | /* TODO */ | |
90 | default: | |
91 | return; | |
92 | } | |
93 | ||
94 | gpio_base = (void __iomem *)KSEG1ADDR(AR71XX_GPIO_BASE); | |
95 | t = __raw_readl(gpio_base + AR71XX_GPIO_REG_FUNC); | |
96 | t |= uart_en; | |
97 | __raw_writel(t, gpio_base + AR71XX_GPIO_REG_FUNC); | |
98 | } | |
99 | ||
0bd3acdf GJ |
100 | static void prom_putchar_init(void) |
101 | { | |
102 | void __iomem *base; | |
103 | u32 id; | |
104 | ||
105 | base = (void __iomem *)(KSEG1ADDR(AR71XX_RESET_BASE)); | |
106 | id = __raw_readl(base + AR71XX_RESET_REG_REV_ID); | |
107 | id &= REV_ID_MAJOR_MASK; | |
108 | ||
109 | switch (id) { | |
110 | case REV_ID_MAJOR_AR71XX: | |
111 | case REV_ID_MAJOR_AR7240: | |
112 | case REV_ID_MAJOR_AR7241: | |
113 | case REV_ID_MAJOR_AR7242: | |
114 | case REV_ID_MAJOR_AR913X: | |
703327dd GJ |
115 | case REV_ID_MAJOR_AR9341: |
116 | case REV_ID_MAJOR_AR9342: | |
117 | case REV_ID_MAJOR_AR9344: | |
af2d1b52 MS |
118 | case REV_ID_MAJOR_QCA9533: |
119 | case REV_ID_MAJOR_QCA9533_V2: | |
90898779 GJ |
120 | case REV_ID_MAJOR_QCA9556: |
121 | case REV_ID_MAJOR_QCA9558: | |
af2d1b52 MS |
122 | case REV_ID_MAJOR_TP9343: |
123 | case REV_ID_MAJOR_QCA956X: | |
0bd3acdf GJ |
124 | _prom_putchar = prom_putchar_ar71xx; |
125 | break; | |
126 | ||
127 | case REV_ID_MAJOR_AR9330: | |
128 | case REV_ID_MAJOR_AR9331: | |
129 | _prom_putchar = prom_putchar_ar933x; | |
130 | break; | |
131 | ||
132 | default: | |
133 | _prom_putchar = prom_putchar_dummy; | |
ffc20581 | 134 | return; |
0bd3acdf | 135 | } |
ffc20581 GJ |
136 | |
137 | prom_enable_uart(id); | |
0bd3acdf GJ |
138 | } |
139 | ||
5c93316c | 140 | void prom_putchar(char ch) |
0bd3acdf GJ |
141 | { |
142 | if (!_prom_putchar) | |
143 | prom_putchar_init(); | |
144 | ||
145 | _prom_putchar(ch); | |
d4a67d9d | 146 | } |