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

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * QNAP TS-x09 Boards common functions
   4  *
   5  * Maintainers: Lennert Buytenhek <buytenh@marvell.com>
   6  *              Byron Bradley <byron.bbradley@gmail.com>
   7  */
   8
   9 #include <linux/kernel.h>
  10 #include <linux/pci.h>
  11 #include <linux/mv643xx_eth.h>
  12 #include <linux/timex.h>
  13 #include <linux/serial_reg.h>
  14 #include "orion5x.h"
  15 #include "tsx09-common.h"
  16 #include "common.h"
  17
  18 /*****************************************************************************
  19  * QNAP TS-x09 specific power off method via UART1-attached PIC
  20  ****************************************************************************/
  21
  22 #define UART1_REG(x)    (UART1_VIRT_BASE + ((UART_##x) << 2))
  23
  24 void qnap_tsx09_power_off(void)
  25 {
  26         /* 19200 baud divisor */
  27         const unsigned divisor = ((orion5x_tclk + (8 * 19200)) / (16 * 19200));
  28
  29         pr_info("%s: triggering power-off...\n", __func__);
  30
  31         /* hijack uart1 and reset into sane state (19200,8n1) */
  32         writel(0x83, UART1_REG(LCR));
  33         writel(divisor & 0xff, UART1_REG(DLL));
  34         writel((divisor >> 8) & 0xff, UART1_REG(DLM));
  35         writel(0x03, UART1_REG(LCR));
  36         writel(0x00, UART1_REG(IER));
  37         writel(0x00, UART1_REG(FCR));
  38         writel(0x00, UART1_REG(MCR));
  39
  40         /* send the power-off command 'A' to PIC */
  41         writel('A', UART1_REG(TX));
  42 }
  43
  44 /*****************************************************************************
  45  * Ethernet
  46  ****************************************************************************/
  47
  48 struct mv643xx_eth_platform_data qnap_tsx09_eth_data = {
  49         .phy_addr       = MV643XX_ETH_PHY_ADDR(8),
  50 };
  51
  52 static int __init qnap_tsx09_parse_hex_nibble(char n)
  53 {
  54         if (n >= '0' && n <= '9')
  55                 return n - '0';
  56
  57         if (n >= 'A' && n <= 'F')
  58                 return n - 'A' + 10;
  59
  60         if (n >= 'a' && n <= 'f')
  61                 return n - 'a' + 10;
  62
  63         return -1;
  64 }
  65
  66 static int __init qnap_tsx09_parse_hex_byte(const char *b)
  67 {
  68         int hi;
  69         int lo;
  70
  71         hi = qnap_tsx09_parse_hex_nibble(b[0]);
  72         lo = qnap_tsx09_parse_hex_nibble(b[1]);
  73
  74         if (hi < 0 || lo < 0)
  75                 return -1;
  76
  77         return (hi << 4) | lo;
  78 }
  79
  80 static int __init qnap_tsx09_check_mac_addr(const char *addr_str)
  81 {
  82         u_int8_t addr[6];
  83         int i;
  84
  85         for (i = 0; i < 6; i++) {
  86                 int byte;
  87
  88                 /*
  89                  * Enforce "xx:xx:xx:xx:xx:xx\n" format.
  90                  */
  91                 if (addr_str[(i * 3) + 2] != ((i < 5) ? ':' : '\n'))
  92                         return -1;
  93
  94                 byte = qnap_tsx09_parse_hex_byte(addr_str + (i * 3));
  95                 if (byte < 0)
  96                         return -1;
  97                 addr[i] = byte;
  98         }
  99
 100         printk(KERN_INFO "tsx09: found ethernet mac address %pM\n", addr);
 101
 102         memcpy(qnap_tsx09_eth_data.mac_addr, addr, 6);
 103
 104         return 0;
 105 }
 106
 107 /*
 108  * The 'NAS Config' flash partition has an ext2 filesystem which
 109  * contains a file that has the ethernet MAC address in plain text
 110  * (format "xx:xx:xx:xx:xx:xx\n").
 111  */
 112 void __init qnap_tsx09_find_mac_addr(u32 mem_base, u32 size)
 113 {
 114         unsigned long addr;
 115
 116         for (addr = mem_base; addr < (mem_base + size); addr += 1024) {
 117                 char *nor_page;
 118                 int ret = 0;
 119
 120                 nor_page = ioremap(addr, 1024);
 121                 if (nor_page != NULL) {
 122                         ret = qnap_tsx09_check_mac_addr(nor_page);
 123                         iounmap(nor_page);
 124                 }
 125
 126                 if (ret == 0)
 127                         break;
 128         }
 129 }