arch/powerpc/sysdev/cpm_common.c

   1 /*
   2  * Common CPM code
   3  *
   4  * Author: Scott Wood <scottwood@freescale.com>
   5  *
   6  * Copyright 2007 Freescale Semiconductor, Inc.
   7  *
   8  * Some parts derived from commproc.c/cpm2_common.c, which is:
   9  * Copyright (c) 1997 Dan error_act (dmalek@jlc.net)
  10  * Copyright (c) 1999-2001 Dan Malek <dan@embeddedalley.com>
  11  * Copyright (c) 2000 MontaVista Software, Inc (source@mvista.com)
  12  * 2006 (c) MontaVista Software, Inc.
  13  * Vitaly Bordug <vbordug@ru.mvista.com>
  14  *
  15  * This program is free software; you can redistribute it and/or modify
  16  * it under the terms of version 2 of the GNU General Public License as
  17  * published by the Free Software Foundation.
  18  */
  19
  20 #include <linux/init.h>
  21 #include <linux/of_device.h>
  22
  23 #include <asm/udbg.h>
  24 #include <asm/io.h>
  25 #include <asm/system.h>
  26 #include <asm/rheap.h>
  27 #include <asm/cpm.h>
  28
  29 #include <mm/mmu_decl.h>
  30
  31 #ifdef CONFIG_PPC_EARLY_DEBUG_CPM
  32 static u32 __iomem *cpm_udbg_txdesc =
  33         (u32 __iomem __force *)CONFIG_PPC_EARLY_DEBUG_CPM_ADDR;
  34
  35 static void udbg_putc_cpm(char c)
  36 {
  37         u8 __iomem *txbuf = (u8 __iomem __force *)in_be32(&cpm_udbg_txdesc[1]);
  38
  39         if (c == '\n')
  40                 udbg_putc('\r');
  41
  42         while (in_be32(&cpm_udbg_txdesc[0]) & 0x80000000)
  43                 ;
  44
  45         out_8(txbuf, c);
  46         out_be32(&cpm_udbg_txdesc[0], 0xa0000001);
  47 }
  48
  49 void __init udbg_init_cpm(void)
  50 {
  51         if (cpm_udbg_txdesc) {
  52 #ifdef CONFIG_CPM2
  53                 setbat(1, 0xf0000000, 0xf0000000, 1024*1024, _PAGE_IO);
  54 #endif
  55                 udbg_putc = udbg_putc_cpm;
  56                 udbg_putc('X');
  57         }
  58 }
  59 #endif
  60
  61 #ifdef CONFIG_PPC_CPM_NEW_BINDING
  62 static spinlock_t cpm_muram_lock;
  63 static rh_block_t cpm_boot_muram_rh_block[16];
  64 static rh_info_t cpm_muram_info;
  65 static u8 __iomem *muram_vbase;
  66 static phys_addr_t muram_pbase;
  67
  68 /* Max address size we deal with */
  69 #define OF_MAX_ADDR_CELLS       4
  70
  71 int __init cpm_muram_init(void)
  72 {
  73         struct device_node *np;
  74         struct resource r;
  75         u32 zero[OF_MAX_ADDR_CELLS] = {};
  76         resource_size_t max = 0;
  77         int i = 0;
  78         int ret = 0;
  79
  80         printk("cpm_muram_init\n");
  81
  82         spin_lock_init(&cpm_muram_lock);
  83         /* initialize the info header */
  84         rh_init(&cpm_muram_info, 1,
  85                 sizeof(cpm_boot_muram_rh_block) /
  86                 sizeof(cpm_boot_muram_rh_block[0]),
  87                 cpm_boot_muram_rh_block);
  88
  89         np = of_find_compatible_node(NULL, NULL, "fsl,cpm-muram-data");
  90         if (!np) {
  91                 printk(KERN_ERR "Cannot find CPM muram data node");
  92                 ret = -ENODEV;
  93                 goto out;
  94         }
  95
  96         muram_pbase = of_translate_address(np, zero);
  97         if (muram_pbase == (phys_addr_t)OF_BAD_ADDR) {
  98                 printk(KERN_ERR "Cannot translate zero through CPM muram node");
  99                 ret = -ENODEV;
 100                 goto out;
 101         }
 102
 103         while (of_address_to_resource(np, i++, &r) == 0) {
 104                 if (r.end > max)
 105                         max = r.end;
 106
 107                 rh_attach_region(&cpm_muram_info, r.start - muram_pbase,
 108                                  r.end - r.start + 1);
 109         }
 110
 111         muram_vbase = ioremap(muram_pbase, max - muram_pbase + 1);
 112         if (!muram_vbase) {
 113                 printk(KERN_ERR "Cannot map CPM muram");
 114                 ret = -ENOMEM;
 115         }
 116
 117 out:
 118         of_node_put(np);
 119         return ret;
 120 }
 121
 122 /**
 123  * cpm_muram_alloc - allocate the requested size worth of multi-user ram
 124  * @size: number of bytes to allocate
 125  * @align: requested alignment, in bytes
 126  *
 127  * This function returns an offset into the muram area.
 128  * Use cpm_dpram_addr() to get the virtual address of the area.
 129  * Use cpm_muram_free() to free the allocation.
 130  */
 131 unsigned long cpm_muram_alloc(unsigned long size, unsigned long align)
 132 {
 133         unsigned long start;
 134         unsigned long flags;
 135
 136         spin_lock_irqsave(&cpm_muram_lock, flags);
 137         cpm_muram_info.alignment = align;
 138         start = rh_alloc(&cpm_muram_info, size, "commproc");
 139         spin_unlock_irqrestore(&cpm_muram_lock, flags);
 140
 141         return start;
 142 }
 143 EXPORT_SYMBOL(cpm_muram_alloc);
 144
 145 /**
 146  * cpm_muram_free - free a chunk of multi-user ram
 147  * @offset: The beginning of the chunk as returned by cpm_muram_alloc().
 148  */
 149 int cpm_muram_free(unsigned long offset)
 150 {
 151         int ret;
 152         unsigned long flags;
 153
 154         spin_lock_irqsave(&cpm_muram_lock, flags);
 155         ret = rh_free(&cpm_muram_info, offset);
 156         spin_unlock_irqrestore(&cpm_muram_lock, flags);
 157
 158         return ret;
 159 }
 160 EXPORT_SYMBOL(cpm_muram_free);
 161
 162 /**
 163  * cpm_muram_alloc_fixed - reserve a specific region of multi-user ram
 164  * @offset: the offset into the muram area to reserve
 165  * @size: the number of bytes to reserve
 166  *
 167  * This function returns "start" on success, -ENOMEM on failure.
 168  * Use cpm_dpram_addr() to get the virtual address of the area.
 169  * Use cpm_muram_free() to free the allocation.
 170  */
 171 unsigned long cpm_muram_alloc_fixed(unsigned long offset, unsigned long size)
 172 {
 173         unsigned long start;
 174         unsigned long flags;
 175
 176         spin_lock_irqsave(&cpm_muram_lock, flags);
 177         cpm_muram_info.alignment = 1;
 178         start = rh_alloc_fixed(&cpm_muram_info, offset, size, "commproc");
 179         spin_unlock_irqrestore(&cpm_muram_lock, flags);
 180
 181         return start;
 182 }
 183 EXPORT_SYMBOL(cpm_muram_alloc_fixed);
 184
 185 /**
 186  * cpm_muram_addr - turn a muram offset into a virtual address
 187  * @offset: muram offset to convert
 188  */
 189 void __iomem *cpm_muram_addr(unsigned long offset)
 190 {
 191         return muram_vbase + offset;
 192 }
 193 EXPORT_SYMBOL(cpm_muram_addr);
 194
 195 /**
 196  * cpm_muram_phys - turn a muram virtual address into a DMA address
 197  * @offset: virtual address from cpm_muram_addr() to convert
 198  */
 199 dma_addr_t cpm_muram_dma(void __iomem *addr)
 200 {
 201         return muram_pbase + ((u8 __iomem *)addr - muram_vbase);
 202 }
 203 EXPORT_SYMBOL(cpm_muram_dma);
 204
 205 #endif /* CONFIG_PPC_CPM_NEW_BINDING */