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tsx09-common.c

/*
 * QNAP TS-x09 Boards common functions
 *
 * Maintainers: Lennert Buytenhek <buytenh@marvell.com>
 *          Byron Bradley <byron.bbradley@gmail.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/mv643xx_eth.h>
#include <linux/timex.h>
#include <linux/serial_reg.h>
#include "tsx09-common.h"

/*****************************************************************************
 * QNAP TS-x09 specific power off method via UART1-attached PIC
 ****************************************************************************/

#define UART1_REG(x)    (UART1_VIRT_BASE + ((UART_##x) << 2))

void qnap_tsx09_power_off(void)
{
      /* 19200 baud divisor */
      const unsigned divisor = ((ORION5X_TCLK + (8 * 19200)) / (16 * 19200));

      pr_info("%s: triggering power-off...\n", __func__);

      /* hijack uart1 and reset into sane state (19200,8n1) */
      writel(0x83, UART1_REG(LCR));
      writel(divisor & 0xff, UART1_REG(DLL));
      writel((divisor >> 8) & 0xff, UART1_REG(DLM));
      writel(0x03, UART1_REG(LCR));
      writel(0x00, UART1_REG(IER));
      writel(0x00, UART1_REG(FCR));
      writel(0x00, UART1_REG(MCR));

      /* send the power-off command 'A' to PIC */
      writel('A', UART1_REG(TX));
}

/*****************************************************************************
 * Ethernet
 ****************************************************************************/

struct mv643xx_eth_platform_data qnap_tsx09_eth_data = {
      .phy_addr   = 8,
};

static int __init qnap_tsx09_parse_hex_nibble(char n)
{
      if (n >= '0' && n <= '9')
            return n - '0';

      if (n >= 'A' && n <= 'F')
            return n - 'A' + 10;

      if (n >= 'a' && n <= 'f')
            return n - 'a' + 10;

      return -1;
}

static int __init qnap_tsx09_parse_hex_byte(const char *b)
{
      int hi;
      int lo;

      hi = qnap_tsx09_parse_hex_nibble(b[0]);
      lo = qnap_tsx09_parse_hex_nibble(b[1]);

      if (hi < 0 || lo < 0)
            return -1;

      return (hi << 4) | lo;
}

static int __init qnap_tsx09_check_mac_addr(const char *addr_str)
{
      u_int8_t addr[6];
      int i;

      for (i = 0; i < 6; i++) {
            int byte;

            /*
             * Enforce "xx:xx:xx:xx:xx:xx\n" format.
             */
            if (addr_str[(i * 3) + 2] != ((i < 5) ? ':' : '\n'))
                  return -1;

            byte = qnap_tsx09_parse_hex_byte(addr_str + (i * 3));
            if (byte < 0)
                  return -1;
            addr[i] = byte;
      }

      printk(KERN_INFO "tsx09: found ethernet mac address ");
      for (i = 0; i < 6; i++)
            printk("%.2x%s", addr[i], (i < 5) ? ":" : ".\n");

      memcpy(qnap_tsx09_eth_data.mac_addr, addr, 6);

      return 0;
}

/*
 * The 'NAS Config' flash partition has an ext2 filesystem which
 * contains a file that has the ethernet MAC address in plain text
 * (format "xx:xx:xx:xx:xx:xx\n").
 */
void __init qnap_tsx09_find_mac_addr(u32 mem_base, u32 size)
{
      unsigned long addr;

      for (addr = mem_base; addr < (mem_base + size); addr += 1024) {
            char *nor_page;
            int ret = 0;

            nor_page = ioremap(addr, 1024);
            if (nor_page != NULL) {
                  ret = qnap_tsx09_check_mac_addr(nor_page);
                  iounmap(nor_page);
            }

            if (ret == 0)
                  break;
      }
}

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