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tsx09-common.c
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1 /*
2  * QNAP TS-x09 Boards common functions
3  *
4  * Maintainers: Lennert Buytenhek <[email protected]>
5  * Byron Bradley <[email protected]>
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 <mach/orion5x.h>
19 #include "tsx09-common.h"
20 #include "common.h"
21 
22 /*****************************************************************************
23  * QNAP TS-x09 specific power off method via UART1-attached PIC
24  ****************************************************************************/
25 
26 #define UART1_REG(x) (UART1_VIRT_BASE + ((UART_##x) << 2))
27 
29 {
30  /* 19200 baud divisor */
31  const unsigned divisor = ((orion5x_tclk + (8 * 19200)) / (16 * 19200));
32 
33  pr_info("%s: triggering power-off...\n", __func__);
34 
35  /* hijack uart1 and reset into sane state (19200,8n1) */
36  writel(0x83, UART1_REG(LCR));
37  writel(divisor & 0xff, UART1_REG(DLL));
38  writel((divisor >> 8) & 0xff, UART1_REG(DLM));
39  writel(0x03, UART1_REG(LCR));
40  writel(0x00, UART1_REG(IER));
41  writel(0x00, UART1_REG(FCR));
42  writel(0x00, UART1_REG(MCR));
43 
44  /* send the power-off command 'A' to PIC */
45  writel('A', UART1_REG(TX));
46 }
47 
48 /*****************************************************************************
49  * Ethernet
50  ****************************************************************************/
51 
53  .phy_addr = MV643XX_ETH_PHY_ADDR(8),
54 };
55 
56 static int __init qnap_tsx09_parse_hex_nibble(char n)
57 {
58  if (n >= '0' && n <= '9')
59  return n - '0';
60 
61  if (n >= 'A' && n <= 'F')
62  return n - 'A' + 10;
63 
64  if (n >= 'a' && n <= 'f')
65  return n - 'a' + 10;
66 
67  return -1;
68 }
69 
70 static int __init qnap_tsx09_parse_hex_byte(const char *b)
71 {
72  int hi;
73  int lo;
74 
75  hi = qnap_tsx09_parse_hex_nibble(b[0]);
76  lo = qnap_tsx09_parse_hex_nibble(b[1]);
77 
78  if (hi < 0 || lo < 0)
79  return -1;
80 
81  return (hi << 4) | lo;
82 }
83 
84 static int __init qnap_tsx09_check_mac_addr(const char *addr_str)
85 {
86  u_int8_t addr[6];
87  int i;
88 
89  for (i = 0; i < 6; i++) {
90  int byte;
91 
92  /*
93  * Enforce "xx:xx:xx:xx:xx:xx\n" format.
94  */
95  if (addr_str[(i * 3) + 2] != ((i < 5) ? ':' : '\n'))
96  return -1;
97 
98  byte = qnap_tsx09_parse_hex_byte(addr_str + (i * 3));
99  if (byte < 0)
100  return -1;
101  addr[i] = byte;
102  }
103 
104  printk(KERN_INFO "tsx09: found ethernet mac address ");
105  for (i = 0; i < 6; i++)
106  printk("%.2x%s", addr[i], (i < 5) ? ":" : ".\n");
107 
108  memcpy(qnap_tsx09_eth_data.mac_addr, addr, 6);
109 
110  return 0;
111 }
112 
113 /*
114  * The 'NAS Config' flash partition has an ext2 filesystem which
115  * contains a file that has the ethernet MAC address in plain text
116  * (format "xx:xx:xx:xx:xx:xx\n").
117  */
119 {
120  unsigned long addr;
121 
122  for (addr = mem_base; addr < (mem_base + size); addr += 1024) {
123  char *nor_page;
124  int ret = 0;
125 
126  nor_page = ioremap(addr, 1024);
127  if (nor_page != NULL) {
128  ret = qnap_tsx09_check_mac_addr(nor_page);
129  iounmap(nor_page);
130  }
131 
132  if (ret == 0)
133  break;
134  }
135 }