arch/arm/mach-orion5x/tsx09-common.c

   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 }