target/linux/brcm47xx/patches-3.0/016-MIPS-BCM47xx-Remove-CFE-console.patch

   1 From 5219981646071abb6731634bf47781a53e248764 Mon Sep 17 00:00:00 2001
   2 From: Hauke Mehrtens <hauke@hauke-m.de>
   3 Date: Sun, 18 Jul 2010 15:11:26 +0200
   4 Subject: [PATCH 6/6] MIPS: BCM47xx: Remove CFE console
   5
   6 Do not use the CFE console. It causes hangs on some devices like the
   7 Buffalo WHR-HP-G54.
   8 This was reported in https://dev.openwrt.org/ticket/4061 and
   9 https://forum.openwrt.org/viewtopic.php?id=17063
  10
  11 Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
  12 ---
  13  arch/mips/Kconfig        |    1 -
  14  arch/mips/bcm47xx/prom.c |   82 +++------------------------------------------
  15  2 files changed, 6 insertions(+), 77 deletions(-)
  16
  17 --- a/arch/mips/Kconfig
  18 +++ b/arch/mips/Kconfig
  19 @@ -94,7 +94,6 @@ config BCM47XX
  20         select SYS_SUPPORTS_32BIT_KERNEL
  21         select SYS_SUPPORTS_LITTLE_ENDIAN
  22         select GENERIC_GPIO
  23 -       select SYS_HAS_EARLY_PRINTK
  24         select CFE
  25         help
  26          Support for BCM47XX based boards
  27 --- a/arch/mips/bcm47xx/prom.c
  28 +++ b/arch/mips/bcm47xx/prom.c
  29 @@ -31,96 +31,28 @@
  30  #include <asm/fw/cfe/cfe_api.h>
  31  #include <asm/fw/cfe/cfe_error.h>
  32
  33 -static int cfe_cons_handle;
  34 -
  35  const char *get_system_type(void)
  36  {
  37         return "Broadcom BCM47XX";
  38  }
  39
  40 -void prom_putchar(char c)
  41 -{
  42 -       while (cfe_write(cfe_cons_handle, &c, 1) == 0)
  43 -               ;
  44 -}
  45 -
  46 -static __init void prom_init_cfe(void)
  47 +static __init int prom_init_cfe(void)
  48  {
  49         uint32_t cfe_ept;
  50         uint32_t cfe_handle;
  51         uint32_t cfe_eptseal;
  52 -       int argc = fw_arg0;
  53 -       char **envp = (char **) fw_arg2;
  54 -       int *prom_vec = (int *) fw_arg3;
  55 -
  56 -       /*
  57 -        * Check if a loader was used; if NOT, the 4 arguments are
  58 -        * what CFE gives us (handle, 0, EPT and EPTSEAL)
  59 -        */
  60 -       if (argc < 0) {
  61 -               cfe_handle = (uint32_t)argc;
  62 -               cfe_ept = (uint32_t)envp;
  63 -               cfe_eptseal = (uint32_t)prom_vec;
  64 -       } else {
  65 -               if ((int)prom_vec < 0) {
  66 -                       /*
  67 -                        * Old loader; all it gives us is the handle,
  68 -                        * so use the "known" entrypoint and assume
  69 -                        * the seal.
  70 -                        */
  71 -                       cfe_handle = (uint32_t)prom_vec;
  72 -                       cfe_ept = 0xBFC00500;
  73 -                       cfe_eptseal = CFE_EPTSEAL;
  74 -               } else {
  75 -                       /*
  76 -                        * Newer loaders bundle the handle/ept/eptseal
  77 -                        * Note: prom_vec is in the loader's useg
  78 -                        * which is still alive in the TLB.
  79 -                        */
  80 -                       cfe_handle = prom_vec[0];
  81 -                       cfe_ept = prom_vec[2];
  82 -                       cfe_eptseal = prom_vec[3];
  83 -               }
  84 -       }
  85 +
  86 +       cfe_eptseal = (uint32_t) fw_arg3;
  87 +       cfe_handle = (uint32_t) fw_arg0;
  88 +       cfe_ept = (uint32_t) fw_arg2;
  89
  90         if (cfe_eptseal != CFE_EPTSEAL) {
  91 -               /* too early for panic to do any good */
  92                 printk(KERN_ERR "CFE's entrypoint seal doesn't match.");
  93 -               while (1) ;
  94 +               return -1;
  95         }
  96
  97         cfe_init(cfe_handle, cfe_ept);
  98 -}
  99 -
 100 -static __init void prom_init_console(void)
 101 -{
 102 -       /* Initialize CFE console */
 103 -       cfe_cons_handle = cfe_getstdhandle(CFE_STDHANDLE_CONSOLE);
 104 -}
 105 -
 106 -static __init void prom_init_cmdline(void)
 107 -{
 108 -       static char buf[COMMAND_LINE_SIZE] __initdata;
 109 -
 110 -       /* Get the kernel command line from CFE */
 111 -       if (cfe_getenv("LINUX_CMDLINE", buf, COMMAND_LINE_SIZE) >= 0) {
 112 -               buf[COMMAND_LINE_SIZE - 1] = 0;
 113 -               strcpy(arcs_cmdline, buf);
 114 -       }
 115 -
 116 -       /* Force a console handover by adding a console= argument if needed,
 117 -        * as CFE is not available anymore later in the boot process. */
 118 -       if ((strstr(arcs_cmdline, "console=")) == NULL) {
 119 -               /* Try to read the default serial port used by CFE */
 120 -               if ((cfe_getenv("BOOT_CONSOLE", buf, COMMAND_LINE_SIZE) < 0)
 121 -                   || (strncmp("uart", buf, 4)))
 122 -                       /* Default to uart0 */
 123 -                       strcpy(buf, "uart0");
 124 -
 125 -               /* Compute the new command line */
 126 -               snprintf(arcs_cmdline, COMMAND_LINE_SIZE, "%s console=ttyS%c,115200",
 127 -                        arcs_cmdline, buf[4]);
 128 -       }
 129 +       return 0;
 130  }
 131
 132  static __init void prom_init_mem(void)
 133 @@ -161,8 +93,6 @@ static __init void prom_init_mem(void)
 134  void __init prom_init(void)
 135  {
 136         prom_init_cfe();
 137 -       prom_init_console();
 138 -       prom_init_cmdline();
 139         prom_init_mem();
 140  }
 141