[POWERPC] cpm: Describe multi-user ram in its own device node.

[deliverable/linux.git] / arch / powerpc / sysdev / cpm_common.c

diff --git a/arch/powerpc/sysdev/cpm_common.c b/arch/powerpc/sysdev/cpm_common.c
index 9daa6ac6767658acd6732699d3a32f8c3ecb1d66..66c8ad4cfce64075a52044238eab4b98ed28b0f8 100644 (file)
--- a/arch/powerpc/sysdev/cpm_common.c
+++ b/arch/powerpc/sysdev/cpm_common.c
@@ -5,15 +5,27 @@
  *
  * Copyright 2007 Freescale Semiconductor, Inc.
  *
+ * Some parts derived from commproc.c/cpm2_common.c, which is:
+ * Copyright (c) 1997 Dan error_act (dmalek@jlc.net)
+ * Copyright (c) 1999-2001 Dan Malek <dan@embeddedalley.com>
+ * Copyright (c) 2000 MontaVista Software, Inc (source@mvista.com)
+ * 2006 (c) MontaVista Software, Inc.
+ * Vitaly Bordug <vbordug@ru.mvista.com>
+ *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of version 2 of the GNU General Public License as
  * published by the Free Software Foundation.
  */
 
 #include <linux/init.h>
+#include <linux/of_device.h>
+
 #include <asm/udbg.h>
 #include <asm/io.h>
 #include <asm/system.h>
+#include <asm/rheap.h>
+#include <asm/cpm.h>
+
 #include <mm/mmu_decl.h>
 
 #ifdef CONFIG_PPC_EARLY_DEBUG_CPM
@@ -41,6 +53,153 @@ void __init udbg_init_cpm(void)
                setbat(1, 0xf0000000, 0xf0000000, 1024*1024, _PAGE_IO);
 #endif
                udbg_putc = udbg_putc_cpm;
+               udbg_putc('X');
        }
 }
 #endif
+
+#ifdef CONFIG_PPC_CPM_NEW_BINDING
+static spinlock_t cpm_muram_lock;
+static rh_block_t cpm_boot_muram_rh_block[16];
+static rh_info_t cpm_muram_info;
+static u8 __iomem *muram_vbase;
+static phys_addr_t muram_pbase;
+
+/* Max address size we deal with */
+#define OF_MAX_ADDR_CELLS      4
+
+int __init cpm_muram_init(void)
+{
+       struct device_node *np;
+       struct resource r;
+       u32 zero[OF_MAX_ADDR_CELLS] = {};
+       resource_size_t max = 0;
+       int i = 0;
+       int ret = 0;
+
+       printk("cpm_muram_init\n");
+
+       spin_lock_init(&cpm_muram_lock);
+       /* initialize the info header */
+       rh_init(&cpm_muram_info, 1,
+               sizeof(cpm_boot_muram_rh_block) /
+               sizeof(cpm_boot_muram_rh_block[0]),
+               cpm_boot_muram_rh_block);
+
+       np = of_find_compatible_node(NULL, NULL, "fsl,cpm-muram-data");
+       if (!np) {
+               printk(KERN_ERR "Cannot find CPM muram data node");
+               ret = -ENODEV;
+               goto out;
+       }
+
+       muram_pbase = of_translate_address(np, zero);
+       if (muram_pbase == (phys_addr_t)OF_BAD_ADDR) {
+               printk(KERN_ERR "Cannot translate zero through CPM muram node");
+               ret = -ENODEV;
+               goto out;
+       }
+
+       while (of_address_to_resource(np, i++, &r) == 0) {
+               if (r.end > max)
+                       max = r.end;
+
+               rh_attach_region(&cpm_muram_info, r.start - muram_pbase,
+                                r.end - r.start + 1);
+       }
+
+       muram_vbase = ioremap(muram_pbase, max - muram_pbase + 1);
+       if (!muram_vbase) {
+               printk(KERN_ERR "Cannot map CPM muram");
+               ret = -ENOMEM;
+       }
+
+out:
+       of_node_put(np);
+       return ret;
+}
+
+/**
+ * cpm_muram_alloc - allocate the requested size worth of multi-user ram
+ * @size: number of bytes to allocate
+ * @align: requested alignment, in bytes
+ *
+ * This function returns an offset into the muram area.
+ * Use cpm_dpram_addr() to get the virtual address of the area.
+ * Use cpm_muram_free() to free the allocation.
+ */
+unsigned long cpm_muram_alloc(unsigned long size, unsigned long align)
+{
+       unsigned long start;
+       unsigned long flags;
+
+       spin_lock_irqsave(&cpm_muram_lock, flags);
+       cpm_muram_info.alignment = align;
+       start = rh_alloc(&cpm_muram_info, size, "commproc");
+       spin_unlock_irqrestore(&cpm_muram_lock, flags);
+
+       return start;
+}
+EXPORT_SYMBOL(cpm_muram_alloc);
+
+/**
+ * cpm_muram_free - free a chunk of multi-user ram
+ * @offset: The beginning of the chunk as returned by cpm_muram_alloc().
+ */
+int cpm_muram_free(unsigned long offset)
+{
+       int ret;
+       unsigned long flags;
+
+       spin_lock_irqsave(&cpm_muram_lock, flags);
+       ret = rh_free(&cpm_muram_info, offset);
+       spin_unlock_irqrestore(&cpm_muram_lock, flags);
+
+       return ret;
+}
+EXPORT_SYMBOL(cpm_muram_free);
+
+/**
+ * cpm_muram_alloc_fixed - reserve a specific region of multi-user ram
+ * @offset: the offset into the muram area to reserve
+ * @size: the number of bytes to reserve
+ *
+ * This function returns "start" on success, -ENOMEM on failure.
+ * Use cpm_dpram_addr() to get the virtual address of the area.
+ * Use cpm_muram_free() to free the allocation.
+ */
+unsigned long cpm_muram_alloc_fixed(unsigned long offset, unsigned long size)
+{
+       unsigned long start;
+       unsigned long flags;
+
+       spin_lock_irqsave(&cpm_muram_lock, flags);
+       cpm_muram_info.alignment = 1;
+       start = rh_alloc_fixed(&cpm_muram_info, offset, size, "commproc");
+       spin_unlock_irqrestore(&cpm_muram_lock, flags);
+
+       return start;
+}
+EXPORT_SYMBOL(cpm_muram_alloc_fixed);
+
+/**
+ * cpm_muram_addr - turn a muram offset into a virtual address
+ * @offset: muram offset to convert
+ */
+void __iomem *cpm_muram_addr(unsigned long offset)
+{
+       return muram_vbase + offset;
+}
+EXPORT_SYMBOL(cpm_muram_addr);
+
+/**
+ * cpm_muram_phys - turn a muram virtual address into a DMA address
+ * @offset: virtual address from cpm_muram_addr() to convert
+ */
+dma_addr_t cpm_muram_dma(void __iomem *addr)
+{
+       return muram_pbase + ((u8 __iomem *)addr - muram_vbase);
+}
+EXPORT_SYMBOL(cpm_muram_dma);
+
+#endif /* CONFIG_PPC_CPM_NEW_BINDING */