1 /*
2  * QNAP TS-x09 Boards common functions
3  *
4  * Maintainers: Lennert Buytenhek <buytenh@marvell.com>
5  *		Byron Bradley <byron.bbradley@gmail.com>
6  *
7  * This program is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU General Public License
9  * as published by the Free Software Foundation; either version
10  * 2 of the License, or (at your option) any later version.
11  */
12 
13 #include <linux/kernel.h>
14 #include <linux/pci.h>
15 #include <linux/mv643xx_eth.h>
16 #include <linux/timex.h>
17 #include <linux/serial_reg.h>
18 #include "tsx09-common.h"
19 #include "common.h"
20 
21 /*****************************************************************************
22  * QNAP TS-x09 specific power off method via UART1-attached PIC
23  ****************************************************************************/
24 
25 #define UART1_REG(x)	(UART1_VIRT_BASE + ((UART_##x) << 2))
26 
27 void qnap_tsx09_power_off(void)
28 {
29 	/* 19200 baud divisor */
30 	const unsigned divisor = ((orion5x_tclk + (8 * 19200)) / (16 * 19200));
31 
32 	pr_info("%s: triggering power-off...\n", __func__);
33 
34 	/* hijack uart1 and reset into sane state (19200,8n1) */
35 	writel(0x83, UART1_REG(LCR));
36 	writel(divisor & 0xff, UART1_REG(DLL));
37 	writel((divisor >> 8) & 0xff, UART1_REG(DLM));
38 	writel(0x03, UART1_REG(LCR));
39 	writel(0x00, UART1_REG(IER));
40 	writel(0x00, UART1_REG(FCR));
41 	writel(0x00, UART1_REG(MCR));
42 
43 	/* send the power-off command 'A' to PIC */
44 	writel('A', UART1_REG(TX));
45 }
46 
47 /*****************************************************************************
48  * Ethernet
49  ****************************************************************************/
50 
51 struct mv643xx_eth_platform_data qnap_tsx09_eth_data = {
52 	.phy_addr	= MV643XX_ETH_PHY_ADDR(8),
53 };
54 
55 static int __init qnap_tsx09_parse_hex_nibble(char n)
56 {
57 	if (n >= '0' && n <= '9')
58 		return n - '0';
59 
60 	if (n >= 'A' && n <= 'F')
61 		return n - 'A' + 10;
62 
63 	if (n >= 'a' && n <= 'f')
64 		return n - 'a' + 10;
65 
66 	return -1;
67 }
68 
69 static int __init qnap_tsx09_parse_hex_byte(const char *b)
70 {
71 	int hi;
72 	int lo;
73 
74 	hi = qnap_tsx09_parse_hex_nibble(b[0]);
75 	lo = qnap_tsx09_parse_hex_nibble(b[1]);
76 
77 	if (hi < 0 || lo < 0)
78 		return -1;
79 
80 	return (hi << 4) | lo;
81 }
82 
83 static int __init qnap_tsx09_check_mac_addr(const char *addr_str)
84 {
85 	u_int8_t addr[6];
86 	int i;
87 
88 	for (i = 0; i < 6; i++) {
89 		int byte;
90 
91 		/*
92 		 * Enforce "xx:xx:xx:xx:xx:xx\n" format.
93 		 */
94 		if (addr_str[(i * 3) + 2] != ((i < 5) ? ':' : '\n'))
95 			return -1;
96 
97 		byte = qnap_tsx09_parse_hex_byte(addr_str + (i * 3));
98 		if (byte < 0)
99 			return -1;
100 		addr[i] = byte;
101 	}
102 
103 	printk(KERN_INFO "tsx09: found ethernet mac address ");
104 	for (i = 0; i < 6; i++)
105 		printk("%.2x%s", addr[i], (i < 5) ? ":" : ".\n");
106 
107 	memcpy(qnap_tsx09_eth_data.mac_addr, addr, 6);
108 
109 	return 0;
110 }
111 
112 /*
113  * The 'NAS Config' flash partition has an ext2 filesystem which
114  * contains a file that has the ethernet MAC address in plain text
115  * (format "xx:xx:xx:xx:xx:xx\n").
116  */
117 void __init qnap_tsx09_find_mac_addr(u32 mem_base, u32 size)
118 {
119 	unsigned long addr;
120 
121 	for (addr = mem_base; addr < (mem_base + size); addr += 1024) {
122 		char *nor_page;
123 		int ret = 0;
124 
125 		nor_page = ioremap(addr, 1024);
126 		if (nor_page != NULL) {
127 			ret = qnap_tsx09_check_mac_addr(nor_page);
128 			iounmap(nor_page);
129 		}
130 
131 		if (ret == 0)
132 			break;
133 	}
134 }
135