diff options
Diffstat (limited to 'arch/powerpc/sysdev/cpm_common.c')
| -rw-r--r-- | arch/powerpc/sysdev/cpm_common.c | 205 |
1 files changed, 205 insertions, 0 deletions
diff --git a/arch/powerpc/sysdev/cpm_common.c b/arch/powerpc/sysdev/cpm_common.c new file mode 100644 index 000000000000..66c8ad4cfce6 --- /dev/null +++ b/arch/powerpc/sysdev/cpm_common.c @@ -0,0 +1,205 @@ +/* + * Common CPM code + * + * Author: Scott Wood <scottwood@freescale.com> + * + * 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 +static u32 __iomem *cpm_udbg_txdesc = + (u32 __iomem __force *)CONFIG_PPC_EARLY_DEBUG_CPM_ADDR; + +static void udbg_putc_cpm(char c) +{ + u8 __iomem *txbuf = (u8 __iomem __force *)in_be32(&cpm_udbg_txdesc[1]); + + if (c == '\n') + udbg_putc('\r'); + + while (in_be32(&cpm_udbg_txdesc[0]) & 0x80000000) + ; + + out_8(txbuf, c); + out_be32(&cpm_udbg_txdesc[0], 0xa0000001); +} + +void __init udbg_init_cpm(void) +{ + if (cpm_udbg_txdesc) { +#ifdef CONFIG_CPM2 + 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 */ |