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1/*
2 * Atheros AR7XXX/AR9XXX SoC early printk support
3 *
4 * Copyright (C) 2008-2011 Gabor Juhos <juhosg@openwrt.org>
5 * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License version 2 as published
9 * by the Free Software Foundation.
10 */
11
12#include <linux/io.h>
13#include <linux/errno.h>
14#include <linux/serial_reg.h>
15#include <asm/addrspace.h>
16
17#include <asm/mach-ath79/ath79.h>
18#include <asm/mach-ath79/ar71xx_regs.h>
19#include <asm/mach-ath79/ar933x_uart.h>
20
21static void (*_prom_putchar) (unsigned char);
22
23static inline void prom_putchar_wait(void __iomem *reg, u32 mask, u32 val)
24{
25 u32 t;
26
27 do {
28 t = __raw_readl(reg);
29 if ((t & mask) == val)
30 break;
31 } while (1);
32}
33
34#define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
35
36static void prom_putchar_ar71xx(unsigned char ch)
37{
38 void __iomem *base = (void __iomem *)(KSEG1ADDR(AR71XX_UART_BASE));
39
40 prom_putchar_wait(base + UART_LSR * 4, BOTH_EMPTY, BOTH_EMPTY);
41 __raw_writel(ch, base + UART_TX * 4);
42 prom_putchar_wait(base + UART_LSR * 4, BOTH_EMPTY, BOTH_EMPTY);
43}
44
45static void prom_putchar_ar933x(unsigned char ch)
46{
47 void __iomem *base = (void __iomem *)(KSEG1ADDR(AR933X_UART_BASE));
48
49 prom_putchar_wait(base + AR933X_UART_DATA_REG, AR933X_UART_DATA_TX_CSR,
50 AR933X_UART_DATA_TX_CSR);
51 __raw_writel(AR933X_UART_DATA_TX_CSR | ch, base + AR933X_UART_DATA_REG);
52 prom_putchar_wait(base + AR933X_UART_DATA_REG, AR933X_UART_DATA_TX_CSR,
53 AR933X_UART_DATA_TX_CSR);
54}
55
56static void prom_putchar_dummy(unsigned char ch)
57{
58 /* nothing to do */
59}
60
61static void prom_putchar_init(void)
62{
63 void __iomem *base;
64 u32 id;
65
66 base = (void __iomem *)(KSEG1ADDR(AR71XX_RESET_BASE));
67 id = __raw_readl(base + AR71XX_RESET_REG_REV_ID);
68 id &= REV_ID_MAJOR_MASK;
69
70 switch (id) {
71 case REV_ID_MAJOR_AR71XX:
72 case REV_ID_MAJOR_AR7240:
73 case REV_ID_MAJOR_AR7241:
74 case REV_ID_MAJOR_AR7242:
75 case REV_ID_MAJOR_AR913X:
76 case REV_ID_MAJOR_AR9341:
77 case REV_ID_MAJOR_AR9342:
78 case REV_ID_MAJOR_AR9344:
79 case REV_ID_MAJOR_QCA9556:
80 case REV_ID_MAJOR_QCA9558:
81 _prom_putchar = prom_putchar_ar71xx;
82 break;
83
84 case REV_ID_MAJOR_AR9330:
85 case REV_ID_MAJOR_AR9331:
86 _prom_putchar = prom_putchar_ar933x;
87 break;
88
89 default:
90 _prom_putchar = prom_putchar_dummy;
91 break;
92 }
93}
94
95void prom_putchar(unsigned char ch)
96{
97 if (!_prom_putchar)
98 prom_putchar_init();
99
100 _prom_putchar(ch);
101}
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Atheros AR7XXX/AR9XXX SoC early printk support
4 *
5 * Copyright (C) 2008-2011 Gabor Juhos <juhosg@openwrt.org>
6 * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
7 */
8
9#include <linux/io.h>
10#include <linux/errno.h>
11#include <linux/serial.h>
12#include <linux/serial_reg.h>
13#include <asm/addrspace.h>
14#include <asm/setup.h>
15
16#include <asm/mach-ath79/ath79.h>
17#include <asm/mach-ath79/ar71xx_regs.h>
18#include <asm/mach-ath79/ar933x_uart.h>
19
20static void (*_prom_putchar)(char);
21
22static inline void prom_putchar_wait(void __iomem *reg, u32 val)
23{
24 u32 t;
25
26 do {
27 t = __raw_readl(reg);
28 if ((t & val) == val)
29 break;
30 } while (1);
31}
32
33static void prom_putchar_ar71xx(char ch)
34{
35 void __iomem *base = (void __iomem *)(KSEG1ADDR(AR71XX_UART_BASE));
36
37 prom_putchar_wait(base + UART_LSR * 4, UART_LSR_BOTH_EMPTY);
38 __raw_writel((unsigned char)ch, base + UART_TX * 4);
39 prom_putchar_wait(base + UART_LSR * 4, UART_LSR_BOTH_EMPTY);
40}
41
42static void prom_putchar_ar933x(char ch)
43{
44 void __iomem *base = (void __iomem *)(KSEG1ADDR(AR933X_UART_BASE));
45
46 prom_putchar_wait(base + AR933X_UART_DATA_REG, AR933X_UART_DATA_TX_CSR);
47 __raw_writel(AR933X_UART_DATA_TX_CSR | (unsigned char)ch,
48 base + AR933X_UART_DATA_REG);
49 prom_putchar_wait(base + AR933X_UART_DATA_REG, AR933X_UART_DATA_TX_CSR);
50}
51
52static void prom_putchar_dummy(char ch)
53{
54 /* nothing to do */
55}
56
57static void prom_enable_uart(u32 id)
58{
59 void __iomem *gpio_base;
60 u32 uart_en;
61 u32 t;
62
63 switch (id) {
64 case REV_ID_MAJOR_AR71XX:
65 uart_en = AR71XX_GPIO_FUNC_UART_EN;
66 break;
67
68 case REV_ID_MAJOR_AR7240:
69 case REV_ID_MAJOR_AR7241:
70 case REV_ID_MAJOR_AR7242:
71 uart_en = AR724X_GPIO_FUNC_UART_EN;
72 break;
73
74 case REV_ID_MAJOR_AR913X:
75 uart_en = AR913X_GPIO_FUNC_UART_EN;
76 break;
77
78 case REV_ID_MAJOR_AR9330:
79 case REV_ID_MAJOR_AR9331:
80 uart_en = AR933X_GPIO_FUNC_UART_EN;
81 break;
82
83 case REV_ID_MAJOR_AR9341:
84 case REV_ID_MAJOR_AR9342:
85 case REV_ID_MAJOR_AR9344:
86 /* TODO */
87 default:
88 return;
89 }
90
91 gpio_base = (void __iomem *)KSEG1ADDR(AR71XX_GPIO_BASE);
92 t = __raw_readl(gpio_base + AR71XX_GPIO_REG_FUNC);
93 t |= uart_en;
94 __raw_writel(t, gpio_base + AR71XX_GPIO_REG_FUNC);
95}
96
97static void prom_putchar_init(void)
98{
99 void __iomem *base;
100 u32 id;
101
102 base = (void __iomem *)(KSEG1ADDR(AR71XX_RESET_BASE));
103 id = __raw_readl(base + AR71XX_RESET_REG_REV_ID);
104 id &= REV_ID_MAJOR_MASK;
105
106 switch (id) {
107 case REV_ID_MAJOR_AR71XX:
108 case REV_ID_MAJOR_AR7240:
109 case REV_ID_MAJOR_AR7241:
110 case REV_ID_MAJOR_AR7242:
111 case REV_ID_MAJOR_AR913X:
112 case REV_ID_MAJOR_AR9341:
113 case REV_ID_MAJOR_AR9342:
114 case REV_ID_MAJOR_AR9344:
115 case REV_ID_MAJOR_QCA9533:
116 case REV_ID_MAJOR_QCA9533_V2:
117 case REV_ID_MAJOR_QCA9556:
118 case REV_ID_MAJOR_QCA9558:
119 case REV_ID_MAJOR_TP9343:
120 case REV_ID_MAJOR_QCA956X:
121 case REV_ID_MAJOR_QCN550X:
122 _prom_putchar = prom_putchar_ar71xx;
123 break;
124
125 case REV_ID_MAJOR_AR9330:
126 case REV_ID_MAJOR_AR9331:
127 _prom_putchar = prom_putchar_ar933x;
128 break;
129
130 default:
131 _prom_putchar = prom_putchar_dummy;
132 return;
133 }
134
135 prom_enable_uart(id);
136}
137
138void prom_putchar(char ch)
139{
140 if (!_prom_putchar)
141 prom_putchar_init();
142
143 _prom_putchar(ch);
144}