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Linux/arch/mips/bcm47xx/prom.c

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  1 /*
  2  *  Copyright (C) 2004 Florian Schirmer <jolt@tuxbox.org>
  3  *  Copyright (C) 2007 Aurelien Jarno <aurelien@aurel32.net>
  4  *  Copyright (C) 2010-2012 Hauke Mehrtens <hauke@hauke-m.de>
  5  *
  6  *  This program is free software; you can redistribute  it and/or modify it
  7  *  under  the terms of  the GNU General  Public License as published by the
  8  *  Free Software Foundation;  either version 2 of the  License, or (at your
  9  *  option) any later version.
 10  *
 11  *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
 12  *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
 13  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
 14  *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
 15  *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 16  *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
 17  *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 18  *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
 19  *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 20  *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 21  *
 22  *  You should have received a copy of the  GNU General Public License along
 23  *  with this program; if not, write  to the Free Software Foundation, Inc.,
 24  *  675 Mass Ave, Cambridge, MA 02139, USA.
 25  */
 26 
 27 #include <linux/init.h>
 28 #include <linux/types.h>
 29 #include <linux/kernel.h>
 30 #include <linux/spinlock.h>
 31 #include <linux/ssb/ssb_driver_chipcommon.h>
 32 #include <linux/ssb/ssb_regs.h>
 33 #include <linux/smp.h>
 34 #include <asm/bootinfo.h>
 35 #include <bcm47xx.h>
 36 #include <bcm47xx_board.h>
 37 
 38 static char bcm47xx_system_type[20] = "Broadcom BCM47XX";
 39 
 40 const char *get_system_type(void)
 41 {
 42         return bcm47xx_system_type;
 43 }
 44 
 45 __init void bcm47xx_set_system_type(u16 chip_id)
 46 {
 47         snprintf(bcm47xx_system_type, sizeof(bcm47xx_system_type),
 48                  (chip_id > 0x9999) ? "Broadcom BCM%d" :
 49                                       "Broadcom BCM%04X",
 50                  chip_id);
 51 }
 52 
 53 static unsigned long lowmem __initdata;
 54 
 55 static __init void prom_init_mem(void)
 56 {
 57         unsigned long mem;
 58         unsigned long max;
 59         unsigned long off;
 60         struct cpuinfo_mips *c = &current_cpu_data;
 61 
 62         /* Figure out memory size by finding aliases.
 63          *
 64          * We should theoretically use the mapping from CFE using cfe_enummem().
 65          * However as the BCM47XX is mostly used on low-memory systems, we
 66          * want to reuse the memory used by CFE (around 4MB). That means cfe_*
 67          * functions stop to work at some point during the boot, we should only
 68          * call them at the beginning of the boot.
 69          *
 70          * BCM47XX uses 128MB for addressing the ram, if the system contains
 71          * less that that amount of ram it remaps the ram more often into the
 72          * available space.
 73          */
 74 
 75         /* Physical address, without mapping to any kernel segment */
 76         off = CPHYSADDR((unsigned long)prom_init);
 77 
 78         /* Accessing memory after 128 MiB will cause an exception */
 79         max = 128 << 20;
 80 
 81         for (mem = 1 << 20; mem < max; mem += 1 << 20) {
 82                 /* Loop condition may be not enough, off may be over 1 MiB */
 83                 if (off + mem >= max) {
 84                         mem = max;
 85                         pr_debug("Assume 128MB RAM\n");
 86                         break;
 87                 }
 88                 if (!memcmp(prom_init, prom_init + mem, 32))
 89                         break;
 90         }
 91         lowmem = mem;
 92 
 93         /* Ignoring the last page when ddr size is 128M. Cached
 94          * accesses to last page is causing the processor to prefetch
 95          * using address above 128M stepping out of the ddr address
 96          * space.
 97          */
 98         if (c->cputype == CPU_74K && (mem == (128  << 20)))
 99                 mem -= 0x1000;
100         add_memory_region(0, mem, BOOT_MEM_RAM);
101 }
102 
103 /*
104  * This is the first serial on the chip common core, it is at this position
105  * for sb (ssb) and ai (bcma) bus.
106  */
107 #define BCM47XX_SERIAL_ADDR (SSB_ENUM_BASE + SSB_CHIPCO_UART0_DATA)
108 
109 void __init prom_init(void)
110 {
111         prom_init_mem();
112         setup_8250_early_printk_port(CKSEG1ADDR(BCM47XX_SERIAL_ADDR), 0, 0);
113 }
114 
115 void __init prom_free_prom_memory(void)
116 {
117 }
118 
119 #if defined(CONFIG_BCM47XX_BCMA) && defined(CONFIG_HIGHMEM)
120 
121 #define EXTVBASE        0xc0000000
122 #define ENTRYLO(x)      ((pte_val(pfn_pte((x) >> _PFN_SHIFT, PAGE_KERNEL_UNCACHED)) >> 6) | 1)
123 
124 #include <asm/tlbflush.h>
125 
126 /* Stripped version of tlb_init, with the call to build_tlb_refill_handler
127  * dropped. Calling it at this stage causes a hang.
128  */
129 void early_tlb_init(void)
130 {
131         write_c0_pagemask(PM_DEFAULT_MASK);
132         write_c0_wired(0);
133         temp_tlb_entry = current_cpu_data.tlbsize - 1;
134         local_flush_tlb_all();
135 }
136 
137 void __init bcm47xx_prom_highmem_init(void)
138 {
139         unsigned long off = (unsigned long)prom_init;
140         unsigned long extmem = 0;
141         bool highmem_region = false;
142 
143         if (WARN_ON(bcm47xx_bus_type != BCM47XX_BUS_TYPE_BCMA))
144                 return;
145 
146         if (bcm47xx_bus.bcma.bus.chipinfo.id == BCMA_CHIP_ID_BCM4706)
147                 highmem_region = true;
148 
149         if (lowmem != 128 << 20 || !highmem_region)
150                 return;
151 
152         early_tlb_init();
153 
154         /* Add one temporary TLB entry to map SDRAM Region 2.
155          *      Physical        Virtual
156          *      0x80000000      0xc0000000      (1st: 256MB)
157          *      0x90000000      0xd0000000      (2nd: 256MB)
158          */
159         add_temporary_entry(ENTRYLO(0x80000000),
160                             ENTRYLO(0x80000000 + (256 << 20)),
161                             EXTVBASE, PM_256M);
162 
163         off = EXTVBASE + __pa(off);
164         for (extmem = 128 << 20; extmem < 512 << 20; extmem <<= 1) {
165                 if (!memcmp(prom_init, (void *)(off + extmem), 16))
166                         break;
167         }
168         extmem -= lowmem;
169 
170         early_tlb_init();
171 
172         if (!extmem)
173                 return;
174 
175         pr_warn("Found %lu MiB of extra memory, but highmem is unsupported yet!\n",
176                 extmem >> 20);
177 
178         /* TODO: Register extra memory */
179 }
180 
181 #endif /* defined(CONFIG_BCM47XX_BCMA) && defined(CONFIG_HIGHMEM) */
182 

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