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 <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
  28 void qnap_tsx09_power_off(void)
  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
  52 struct mv643xx_eth_platform_data qnap_tsx09_eth_data = {
  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  */
 118 void __init qnap_tsx09_find_mac_addr(u32 mem_base, u32 size)
 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 }