1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * QNAP TS-x09 Boards common functions
4  *
5  * Maintainers: Lennert Buytenhek <buytenh@marvell.com>
6  *		Byron Bradley <byron.bbradley@gmail.com>
7  */
8 
9 #include <linux/kernel.h>
10 #include <linux/pci.h>
11 #include <linux/mv643xx_eth.h>
12 #include <linux/timex.h>
13 #include <linux/serial_reg.h>
14 #include "orion5x.h"
15 #include "tsx09-common.h"
16 #include "common.h"
17 
18 /*****************************************************************************
19  * QNAP TS-x09 specific power off method via UART1-attached PIC
20  ****************************************************************************/
21 
22 #define UART1_REG(x)	(UART1_VIRT_BASE + ((UART_##x) << 2))
23 
24 void qnap_tsx09_power_off(void)
25 {
26 	/* 19200 baud divisor */
27 	const unsigned divisor = ((orion5x_tclk + (8 * 19200)) / (16 * 19200));
28 
29 	pr_info("%s: triggering power-off...\n", __func__);
30 
31 	/* hijack uart1 and reset into sane state (19200,8n1) */
32 	writel(0x83, UART1_REG(LCR));
33 	writel(divisor & 0xff, UART1_REG(DLL));
34 	writel((divisor >> 8) & 0xff, UART1_REG(DLM));
35 	writel(0x03, UART1_REG(LCR));
36 	writel(0x00, UART1_REG(IER));
37 	writel(0x00, UART1_REG(FCR));
38 	writel(0x00, UART1_REG(MCR));
39 
40 	/* send the power-off command 'A' to PIC */
41 	writel('A', UART1_REG(TX));
42 }
43 
44 /*****************************************************************************
45  * Ethernet
46  ****************************************************************************/
47 
48 struct mv643xx_eth_platform_data qnap_tsx09_eth_data = {
49 	.phy_addr	= MV643XX_ETH_PHY_ADDR(8),
50 };
51 
52 static int __init qnap_tsx09_parse_hex_nibble(char n)
53 {
54 	if (n >= '0' && n <= '9')
55 		return n - '0';
56 
57 	if (n >= 'A' && n <= 'F')
58 		return n - 'A' + 10;
59 
60 	if (n >= 'a' && n <= 'f')
61 		return n - 'a' + 10;
62 
63 	return -1;
64 }
65 
66 static int __init qnap_tsx09_parse_hex_byte(const char *b)
67 {
68 	int hi;
69 	int lo;
70 
71 	hi = qnap_tsx09_parse_hex_nibble(b[0]);
72 	lo = qnap_tsx09_parse_hex_nibble(b[1]);
73 
74 	if (hi < 0 || lo < 0)
75 		return -1;
76 
77 	return (hi << 4) | lo;
78 }
79 
80 static int __init qnap_tsx09_check_mac_addr(const char *addr_str)
81 {
82 	u_int8_t addr[6];
83 	int i;
84 
85 	for (i = 0; i < 6; i++) {
86 		int byte;
87 
88 		/*
89 		 * Enforce "xx:xx:xx:xx:xx:xx\n" format.
90 		 */
91 		if (addr_str[(i * 3) + 2] != ((i < 5) ? ':' : '\n'))
92 			return -1;
93 
94 		byte = qnap_tsx09_parse_hex_byte(addr_str + (i * 3));
95 		if (byte < 0)
96 			return -1;
97 		addr[i] = byte;
98 	}
99 
100 	printk(KERN_INFO "tsx09: found ethernet mac address %pM\n", addr);
101 
102 	memcpy(qnap_tsx09_eth_data.mac_addr, addr, 6);
103 
104 	return 0;
105 }
106 
107 /*
108  * The 'NAS Config' flash partition has an ext2 filesystem which
109  * contains a file that has the ethernet MAC address in plain text
110  * (format "xx:xx:xx:xx:xx:xx\n").
111  */
112 void __init qnap_tsx09_find_mac_addr(u32 mem_base, u32 size)
113 {
114 	unsigned long addr;
115 
116 	for (addr = mem_base; addr < (mem_base + size); addr += 1024) {
117 		char *nor_page;
118 		int ret = 0;
119 
120 		nor_page = ioremap(addr, 1024);
121 		if (nor_page != NULL) {
122 			ret = qnap_tsx09_check_mac_addr(nor_page);
123 			iounmap(nor_page);
124 		}
125 
126 		if (ret == 0)
127 			break;
128 	}
129 }
130