arch/powerpc/sysdev/commproc.c - kernel/msm-4.19 - Gitiles

 /*
  * General Purpose functions for the global management of the
  * Communication Processor Module.
  * Copyright (c) 1997 Dan error_act (dmalek@jlc.net)
  *
  * In addition to the individual control of the communication
  * channels, there are a few functions that globally affect the
  * communication processor.
  *
  * Buffer descriptors must be allocated from the dual ported memory
  * space.  The allocator for that is here.  When the communication
  * process is reset, we reclaim the memory available.  There is
  * currently no deallocator for this memory.
  * The amount of space available is platform dependent.  On the
  * MBX, the EPPC software loads additional microcode into the
  * communication processor, and uses some of the DP ram for this
  * purpose.  Current, the first 512 bytes and the last 256 bytes of
  * memory are used.  Right now I am conservative and only use the
  * memory that can never be used for microcode.  If there are
  * applications that require more DP ram, we can expand the boundaries
  * but then we have to be careful of any downloaded microcode.
  */
 #include <linux/errno.h>
 #include <linux/sched.h>
 #include <linux/kernel.h>
 #include <linux/dma-mapping.h>
 #include <linux/param.h>
 #include <linux/string.h>
 #include <linux/mm.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>
 #include <linux/module.h>
 #include <asm/mpc8xx.h>
 #include <asm/page.h>
 #include <asm/pgtable.h>
 #include <asm/8xx_immap.h>
 #include <asm/commproc.h>
 #include <asm/io.h>
 #include <asm/tlbflush.h>
 #include <asm/rheap.h>
 #include <asm/prom.h>

 #include <asm/fs_pd.h>

 #define CPM_MAP_SIZE    (0x4000)

 static void m8xx_cpm_dpinit(void);
 static	uint	host_buffer;	/* One page of host buffer */
 static	uint	host_end;	/* end + 1 */
 cpm8xx_t	*cpmp;		/* Pointer to comm processor space */
 cpic8xx_t	*cpic_reg;

 static struct device_node *cpm_pic_node;
 static struct irq_host *cpm_pic_host;

 static void cpm_mask_irq(unsigned int irq)
 {
 	unsigned int cpm_vec = (unsigned int)irq_map[irq].hwirq;

 	clrbits32(&cpic_reg->cpic_cimr, (1 << cpm_vec));
 }

 static void cpm_unmask_irq(unsigned int irq)
 {
 	unsigned int cpm_vec = (unsigned int)irq_map[irq].hwirq;

 	setbits32(&cpic_reg->cpic_cimr, (1 << cpm_vec));
 }

 static void cpm_end_irq(unsigned int irq)
 {
 	unsigned int cpm_vec = (unsigned int)irq_map[irq].hwirq;

 	out_be32(&cpic_reg->cpic_cisr, (1 << cpm_vec));
 }

 static struct irq_chip cpm_pic = {
 	.typename = " CPM PIC ",
 	.mask = cpm_mask_irq,
 	.unmask = cpm_unmask_irq,
 	.eoi = cpm_end_irq,
 };

 int cpm_get_irq(void)
 {
 	int cpm_vec;

 	/* Get the vector by setting the ACK bit and then reading
 	 * the register.
 	 */
 	out_be16(&cpic_reg->cpic_civr, 1);
 	cpm_vec = in_be16(&cpic_reg->cpic_civr);
 	cpm_vec >>= 11;

 	return irq_linear_revmap(cpm_pic_host, cpm_vec);
 }

 static int cpm_pic_host_match(struct irq_host *h, struct device_node *node)
 {
 	return cpm_pic_node == node;
 }

 static int cpm_pic_host_map(struct irq_host *h, unsigned int virq,
 			  irq_hw_number_t hw)
 {
 	pr_debug("cpm_pic_host_map(%d, 0x%lx)\n", virq, hw);

 	get_irq_desc(virq)->status |= IRQ_LEVEL;
 	set_irq_chip_and_handler(virq, &cpm_pic, handle_fasteoi_irq);
 	return 0;
 }

 /* The CPM can generate the error interrupt when there is a race condition
  * between generating and masking interrupts.  All we have to do is ACK it
  * and return.  This is a no-op function so we don't need any special
  * tests in the interrupt handler.
  */
 static	irqreturn_t cpm_error_interrupt(int irq, void *dev)
 {
 	return IRQ_HANDLED;
 }

 static struct irqaction cpm_error_irqaction = {
 	.handler = cpm_error_interrupt,
 	.mask = CPU_MASK_NONE,
 	.name = "error",
 };

 static struct irq_host_ops cpm_pic_host_ops = {
 	.match = cpm_pic_host_match,
 	.map = cpm_pic_host_map,
 };

 unsigned int cpm_pic_init(void)
 {
 	struct device_node *np = NULL;
 	struct resource res;
 	unsigned int sirq = NO_IRQ, hwirq, eirq;
 	int ret;

 	pr_debug("cpm_pic_init\n");

 	np = of_find_compatible_node(NULL, "cpm-pic", "CPM");
 	if (np == NULL) {
 		printk(KERN_ERR "CPM PIC init: can not find cpm-pic node\n");
 		return sirq;
 	}
 	ret = of_address_to_resource(np, 0, &res);
 	if (ret)
 		goto end;

 	cpic_reg = (void *)ioremap(res.start, res.end - res.start + 1);
 	if (cpic_reg == NULL)
 		goto end;

 	sirq = irq_of_parse_and_map(np, 0);
 	if (sirq == NO_IRQ)
 		goto end;

 	/* Initialize the CPM interrupt controller. */
 	hwirq = (unsigned int)irq_map[sirq].hwirq;
 	out_be32(&cpic_reg->cpic_cicr,
 	    (CICR_SCD_SCC4 | CICR_SCC_SCC3 | CICR_SCB_SCC2 | CICR_SCA_SCC1) |
 		((hwirq/2) << 13) | CICR_HP_MASK);

 	out_be32(&cpic_reg->cpic_cimr, 0);

 	cpm_pic_node = of_node_get(np);

 	cpm_pic_host = irq_alloc_host(IRQ_HOST_MAP_LINEAR, 64, &cpm_pic_host_ops, 64);
 	if (cpm_pic_host == NULL) {
 		printk(KERN_ERR "CPM2 PIC: failed to allocate irq host!\n");
 		sirq = NO_IRQ;
 		goto end;
 	}
 	of_node_put(np);

 	/* Install our own error handler. */
 	np = of_find_node_by_type(NULL, "cpm");
 	if (np == NULL) {
 		printk(KERN_ERR "CPM PIC init: can not find cpm node\n");
 		goto end;
 	}
 	eirq= irq_of_parse_and_map(np, 0);
 	if (eirq == NO_IRQ)
 		goto end;

 	if (setup_irq(eirq, &cpm_error_irqaction))
 		printk(KERN_ERR "Could not allocate CPM error IRQ!");

 	setbits32(&cpic_reg->cpic_cicr, CICR_IEN);

 end:
 	of_node_put(np);
 	return sirq;
 }

 void cpm_reset(void)
 {
 	cpm8xx_t	*commproc;
 	sysconf8xx_t    *siu_conf;

 	commproc = (cpm8xx_t *)ioremap(CPM_MAP_ADDR, CPM_MAP_SIZE);

 #ifdef CONFIG_UCODE_PATCH
 	/* Perform a reset.
 	*/
 	out_be16(&commproc->cp_cpcr,  CPM_CR_RST | CPM_CR_FLG);

 	/* Wait for it.
 	*/
 	while (in_be16(&commproc->cp_cpcr) & CPM_CR_FLG);

 	cpm_load_patch(commproc);
 #endif

 	/* Set SDMA Bus Request priority 5.
 	 * On 860T, this also enables FEC priority 6.  I am not sure
 	 * this is what we realy want for some applications, but the
 	 * manual recommends it.
 	 * Bit 25, FAM can also be set to use FEC aggressive mode (860T).
 	 */
 	siu_conf = (sysconf8xx_t*)immr_map(im_siu_conf);
 	out_be32(&siu_conf->sc_sdcr, 1);
 	immr_unmap(siu_conf);

 	/* Reclaim the DP memory for our use. */
 	m8xx_cpm_dpinit();

 	/* Tell everyone where the comm processor resides.
 	*/
 	cpmp = commproc;
 }

 /* We used to do this earlier, but have to postpone as long as possible
  * to ensure the kernel VM is now running.
  */
 static void
 alloc_host_memory(void)
 {
 	dma_addr_t	physaddr;

 	/* Set the host page for allocation.
 	*/
 	host_buffer = (uint)dma_alloc_coherent(NULL, PAGE_SIZE, &physaddr,
 			GFP_KERNEL);
 	host_end = host_buffer + PAGE_SIZE;
 }

 /* We also own one page of host buffer space for the allocation of
  * UART "fifos" and the like.
  */
 uint
 m8xx_cpm_hostalloc(uint size)
 {
 	uint	retloc;

 	if (host_buffer == 0)
 		alloc_host_memory();

 	if ((host_buffer + size) >= host_end)
 		return(0);

 	retloc = host_buffer;
 	host_buffer += size;

 	return(retloc);
 }

 /* Set a baud rate generator.  This needs lots of work.  There are
  * four BRGs, any of which can be wired to any channel.
  * The internal baud rate clock is the system clock divided by 16.
  * This assumes the baudrate is 16x oversampled by the uart.
  */
 #define BRG_INT_CLK		(get_brgfreq())
 #define BRG_UART_CLK		(BRG_INT_CLK/16)
 #define BRG_UART_CLK_DIV16	(BRG_UART_CLK/16)

 void
 cpm_setbrg(uint brg, uint rate)
 {
 	volatile uint	*bp;

 	/* This is good enough to get SMCs running.....
 	*/
 	bp = (uint *)&cpmp->cp_brgc1;
 	bp += brg;
 	/* The BRG has a 12-bit counter.  For really slow baud rates (or
 	 * really fast processors), we may have to further divide by 16.
 	 */
 	if (((BRG_UART_CLK / rate) - 1) < 4096)
 		*bp = (((BRG_UART_CLK / rate) - 1) << 1) | CPM_BRG_EN;
 	else
 		*bp = (((BRG_UART_CLK_DIV16 / rate) - 1) << 1) |
 						CPM_BRG_EN | CPM_BRG_DIV16;
 }

 /*
  * dpalloc / dpfree bits.
  */
 static spinlock_t cpm_dpmem_lock;
 /*
  * 16 blocks should be enough to satisfy all requests
  * until the memory subsystem goes up...
  */
 static rh_block_t cpm_boot_dpmem_rh_block[16];
 static rh_info_t cpm_dpmem_info;

 #define CPM_DPMEM_ALIGNMENT	8
 static u8* dpram_vbase;
 static uint dpram_pbase;

 void m8xx_cpm_dpinit(void)
 {
 	spin_lock_init(&cpm_dpmem_lock);

 	dpram_vbase = immr_map_size(im_cpm.cp_dpmem, CPM_DATAONLY_BASE + CPM_DATAONLY_SIZE);
 	dpram_pbase = (uint)&((immap_t *)IMAP_ADDR)->im_cpm.cp_dpmem;

 	/* Initialize the info header */
 	rh_init(&cpm_dpmem_info, CPM_DPMEM_ALIGNMENT,
 			sizeof(cpm_boot_dpmem_rh_block) /
 			sizeof(cpm_boot_dpmem_rh_block[0]),
 			cpm_boot_dpmem_rh_block);

 	/*
 	 * Attach the usable dpmem area.
 	 * XXX: This is actually crap.  CPM_DATAONLY_BASE and
 	 * CPM_DATAONLY_SIZE are a subset of the available dparm.  It varies
 	 * with the processor and the microcode patches applied / activated.
 	 * But the following should be at least safe.
 	 */
 	rh_attach_region(&cpm_dpmem_info, CPM_DATAONLY_BASE, CPM_DATAONLY_SIZE);
 }

 /*
  * Allocate the requested size worth of DP memory.
  * This function returns an offset into the DPRAM area.
  * Use cpm_dpram_addr() to get the virtual address of the area.
  */
 unsigned long cpm_dpalloc(uint size, uint align)
 {
 	unsigned long start;
 	unsigned long flags;

 	spin_lock_irqsave(&cpm_dpmem_lock, flags);
 	cpm_dpmem_info.alignment = align;
 	start = rh_alloc(&cpm_dpmem_info, size, "commproc");
 	spin_unlock_irqrestore(&cpm_dpmem_lock, flags);

 	return (uint)start;
 }
 EXPORT_SYMBOL(cpm_dpalloc);

 int cpm_dpfree(unsigned long offset)
 {
 	int ret;
 	unsigned long flags;

 	spin_lock_irqsave(&cpm_dpmem_lock, flags);
 	ret = rh_free(&cpm_dpmem_info, offset);
 	spin_unlock_irqrestore(&cpm_dpmem_lock, flags);

 	return ret;
 }
 EXPORT_SYMBOL(cpm_dpfree);

 unsigned long cpm_dpalloc_fixed(unsigned long offset, uint size, uint align)
 {
 	unsigned long start;
 	unsigned long flags;

 	spin_lock_irqsave(&cpm_dpmem_lock, flags);
 	cpm_dpmem_info.alignment = align;
 	start = rh_alloc_fixed(&cpm_dpmem_info, offset, size, "commproc");
 	spin_unlock_irqrestore(&cpm_dpmem_lock, flags);

 	return start;
 }
 EXPORT_SYMBOL(cpm_dpalloc_fixed);

 void cpm_dpdump(void)
 {
 	rh_dump(&cpm_dpmem_info);
 }
 EXPORT_SYMBOL(cpm_dpdump);

 void *cpm_dpram_addr(unsigned long offset)
 {
 	return (void *)(dpram_vbase + offset);
 }
 EXPORT_SYMBOL(cpm_dpram_addr);

 uint cpm_dpram_phys(u8* addr)
 {
 	return (dpram_pbase + (uint)(addr - dpram_vbase));
 }
 EXPORT_SYMBOL(cpm_dpram_addr);
	/*
	* General Purpose functions for the global management of the
	* Communication Processor Module.
	* Copyright (c) 1997 Dan error_act (dmalek@jlc.net)
	*
	* In addition to the individual control of the communication
	* channels, there are a few functions that globally affect the
	* communication processor.
	*
	* Buffer descriptors must be allocated from the dual ported memory
	* space. The allocator for that is here. When the communication
	* process is reset, we reclaim the memory available. There is
	* currently no deallocator for this memory.
	* The amount of space available is platform dependent. On the
	* MBX, the EPPC software loads additional microcode into the
	* communication processor, and uses some of the DP ram for this
	* purpose. Current, the first 512 bytes and the last 256 bytes of
	* memory are used. Right now I am conservative and only use the
	* memory that can never be used for microcode. If there are
	* applications that require more DP ram, we can expand the boundaries
	* but then we have to be careful of any downloaded microcode.
	*/
	#include <linux/errno.h>
	#include <linux/sched.h>
	#include <linux/kernel.h>
	#include <linux/dma-mapping.h>
	#include <linux/param.h>
	#include <linux/string.h>
	#include <linux/mm.h>
	#include <linux/interrupt.h>
	#include <linux/irq.h>
	#include <linux/module.h>
	#include <asm/mpc8xx.h>
	#include <asm/page.h>
	#include <asm/pgtable.h>
	#include <asm/8xx_immap.h>
	#include <asm/commproc.h>
	#include <asm/io.h>
	#include <asm/tlbflush.h>
	#include <asm/rheap.h>
	#include <asm/prom.h>

	#include <asm/fs_pd.h>

	#define CPM_MAP_SIZE (0x4000)

	static void m8xx_cpm_dpinit(void);
	static uint host_buffer; /* One page of host buffer */
	static uint host_end; /* end + 1 */
	cpm8xx_t cpmp; / Pointer to comm processor space */
	cpic8xx_t *cpic_reg;

	static struct device_node *cpm_pic_node;
	static struct irq_host *cpm_pic_host;

	static void cpm_mask_irq(unsigned int irq)
	{
	unsigned int cpm_vec = (unsigned int)irq_map[irq].hwirq;

	clrbits32(&cpic_reg->cpic_cimr, (1 << cpm_vec));
	}

	static void cpm_unmask_irq(unsigned int irq)
	{
	unsigned int cpm_vec = (unsigned int)irq_map[irq].hwirq;

	setbits32(&cpic_reg->cpic_cimr, (1 << cpm_vec));
	}

	static void cpm_end_irq(unsigned int irq)
	{
	unsigned int cpm_vec = (unsigned int)irq_map[irq].hwirq;

	out_be32(&cpic_reg->cpic_cisr, (1 << cpm_vec));
	}

	static struct irq_chip cpm_pic = {
	.typename = " CPM PIC ",
	.mask = cpm_mask_irq,
	.unmask = cpm_unmask_irq,
	.eoi = cpm_end_irq,
	};

	int cpm_get_irq(void)
	{
	int cpm_vec;

	/* Get the vector by setting the ACK bit and then reading
	* the register.
	*/
	out_be16(&cpic_reg->cpic_civr, 1);
	cpm_vec = in_be16(&cpic_reg->cpic_civr);
	cpm_vec >>= 11;

	return irq_linear_revmap(cpm_pic_host, cpm_vec);
	}

	static int cpm_pic_host_match(struct irq_host h, struct device_node node)
	{
	return cpm_pic_node == node;
	}

	static int cpm_pic_host_map(struct irq_host *h, unsigned int virq,
	irq_hw_number_t hw)
	{
	pr_debug("cpm_pic_host_map(%d, 0x%lx)\n", virq, hw);

	get_irq_desc(virq)->status \|= IRQ_LEVEL;
	set_irq_chip_and_handler(virq, &cpm_pic, handle_fasteoi_irq);
	return 0;
	}

	/* The CPM can generate the error interrupt when there is a race condition
	* between generating and masking interrupts. All we have to do is ACK it
	* and return. This is a no-op function so we don't need any special
	* tests in the interrupt handler.
	*/
	static irqreturn_t cpm_error_interrupt(int irq, void *dev)
	{
	return IRQ_HANDLED;
	}

	static struct irqaction cpm_error_irqaction = {
	.handler = cpm_error_interrupt,
	.mask = CPU_MASK_NONE,
	.name = "error",
	};

	static struct irq_host_ops cpm_pic_host_ops = {
	.match = cpm_pic_host_match,
	.map = cpm_pic_host_map,
	};

	unsigned int cpm_pic_init(void)
	{
	struct device_node *np = NULL;
	struct resource res;
	unsigned int sirq = NO_IRQ, hwirq, eirq;
	int ret;

	pr_debug("cpm_pic_init\n");

	np = of_find_compatible_node(NULL, "cpm-pic", "CPM");
	if (np == NULL) {
	printk(KERN_ERR "CPM PIC init: can not find cpm-pic node\n");
	return sirq;
	}
	ret = of_address_to_resource(np, 0, &res);
	if (ret)
	goto end;

	cpic_reg = (void *)ioremap(res.start, res.end - res.start + 1);
	if (cpic_reg == NULL)
	goto end;

	sirq = irq_of_parse_and_map(np, 0);
	if (sirq == NO_IRQ)
	goto end;

	/* Initialize the CPM interrupt controller. */
	hwirq = (unsigned int)irq_map[sirq].hwirq;
	out_be32(&cpic_reg->cpic_cicr,
	(CICR_SCD_SCC4 \| CICR_SCC_SCC3 \| CICR_SCB_SCC2 \| CICR_SCA_SCC1) \|
	((hwirq/2) << 13) \| CICR_HP_MASK);

	out_be32(&cpic_reg->cpic_cimr, 0);

	cpm_pic_node = of_node_get(np);

	cpm_pic_host = irq_alloc_host(IRQ_HOST_MAP_LINEAR, 64, &cpm_pic_host_ops, 64);
	if (cpm_pic_host == NULL) {
	printk(KERN_ERR "CPM2 PIC: failed to allocate irq host!\n");
	sirq = NO_IRQ;
	goto end;
	}
	of_node_put(np);

	/* Install our own error handler. */
	np = of_find_node_by_type(NULL, "cpm");
	if (np == NULL) {
	printk(KERN_ERR "CPM PIC init: can not find cpm node\n");
	goto end;
	}
	eirq= irq_of_parse_and_map(np, 0);
	if (eirq == NO_IRQ)
	goto end;

	if (setup_irq(eirq, &cpm_error_irqaction))
	printk(KERN_ERR "Could not allocate CPM error IRQ!");

	setbits32(&cpic_reg->cpic_cicr, CICR_IEN);

	end:
	of_node_put(np);
	return sirq;
	}

	void cpm_reset(void)
	{
	cpm8xx_t *commproc;
	sysconf8xx_t *siu_conf;

	commproc = (cpm8xx_t *)ioremap(CPM_MAP_ADDR, CPM_MAP_SIZE);

	#ifdef CONFIG_UCODE_PATCH
	/* Perform a reset.
	*/
	out_be16(&commproc->cp_cpcr, CPM_CR_RST \| CPM_CR_FLG);

	/* Wait for it.
	*/
	while (in_be16(&commproc->cp_cpcr) & CPM_CR_FLG);

	cpm_load_patch(commproc);
	#endif

	/* Set SDMA Bus Request priority 5.
	* On 860T, this also enables FEC priority 6. I am not sure
	* this is what we realy want for some applications, but the
	* manual recommends it.
	* Bit 25, FAM can also be set to use FEC aggressive mode (860T).
	*/
	siu_conf = (sysconf8xx_t*)immr_map(im_siu_conf);
	out_be32(&siu_conf->sc_sdcr, 1);
	immr_unmap(siu_conf);

	/* Reclaim the DP memory for our use. */
	m8xx_cpm_dpinit();

	/* Tell everyone where the comm processor resides.
	*/
	cpmp = commproc;
	}

	/* We used to do this earlier, but have to postpone as long as possible
	* to ensure the kernel VM is now running.
	*/
	static void
	alloc_host_memory(void)
	{
	dma_addr_t physaddr;

	/* Set the host page for allocation.
	*/
	host_buffer = (uint)dma_alloc_coherent(NULL, PAGE_SIZE, &physaddr,
	GFP_KERNEL);
	host_end = host_buffer + PAGE_SIZE;
	}

	/* We also own one page of host buffer space for the allocation of
	* UART "fifos" and the like.
	*/
	uint
	m8xx_cpm_hostalloc(uint size)
	{
	uint retloc;

	if (host_buffer == 0)
	alloc_host_memory();

	if ((host_buffer + size) >= host_end)
	return(0);

	retloc = host_buffer;
	host_buffer += size;

	return(retloc);
	}

	/* Set a baud rate generator. This needs lots of work. There are
	* four BRGs, any of which can be wired to any channel.
	* The internal baud rate clock is the system clock divided by 16.
	* This assumes the baudrate is 16x oversampled by the uart.
	*/
	#define BRG_INT_CLK (get_brgfreq())
	#define BRG_UART_CLK (BRG_INT_CLK/16)
	#define BRG_UART_CLK_DIV16 (BRG_UART_CLK/16)

	void
	cpm_setbrg(uint brg, uint rate)
	{
	volatile uint *bp;

	/* This is good enough to get SMCs running.....
	*/
	bp = (uint *)&cpmp->cp_brgc1;
	bp += brg;
	/* The BRG has a 12-bit counter. For really slow baud rates (or
	* really fast processors), we may have to further divide by 16.
	*/
	if (((BRG_UART_CLK / rate) - 1) < 4096)
	*bp = (((BRG_UART_CLK / rate) - 1) << 1) \| CPM_BRG_EN;
	else
	*bp = (((BRG_UART_CLK_DIV16 / rate) - 1) << 1) \|
	CPM_BRG_EN \| CPM_BRG_DIV16;
	}

	/*
	* dpalloc / dpfree bits.
	*/
	static spinlock_t cpm_dpmem_lock;
	/*
	* 16 blocks should be enough to satisfy all requests
	* until the memory subsystem goes up...
	*/
	static rh_block_t cpm_boot_dpmem_rh_block[16];
	static rh_info_t cpm_dpmem_info;

	#define CPM_DPMEM_ALIGNMENT 8
	static u8* dpram_vbase;
	static uint dpram_pbase;

	void m8xx_cpm_dpinit(void)
	{
	spin_lock_init(&cpm_dpmem_lock);

	dpram_vbase = immr_map_size(im_cpm.cp_dpmem, CPM_DATAONLY_BASE + CPM_DATAONLY_SIZE);
	dpram_pbase = (uint)&((immap_t *)IMAP_ADDR)->im_cpm.cp_dpmem;

	/* Initialize the info header */
	rh_init(&cpm_dpmem_info, CPM_DPMEM_ALIGNMENT,
	sizeof(cpm_boot_dpmem_rh_block) /
	sizeof(cpm_boot_dpmem_rh_block[0]),
	cpm_boot_dpmem_rh_block);

	/*
	* Attach the usable dpmem area.
	* XXX: This is actually crap. CPM_DATAONLY_BASE and
	* CPM_DATAONLY_SIZE are a subset of the available dparm. It varies
	* with the processor and the microcode patches applied / activated.
	* But the following should be at least safe.
	*/
	rh_attach_region(&cpm_dpmem_info, CPM_DATAONLY_BASE, CPM_DATAONLY_SIZE);
	}

	/*
	* Allocate the requested size worth of DP memory.
	* This function returns an offset into the DPRAM area.
	* Use cpm_dpram_addr() to get the virtual address of the area.
	*/
	unsigned long cpm_dpalloc(uint size, uint align)
	{
	unsigned long start;
	unsigned long flags;

	spin_lock_irqsave(&cpm_dpmem_lock, flags);
	cpm_dpmem_info.alignment = align;
	start = rh_alloc(&cpm_dpmem_info, size, "commproc");
	spin_unlock_irqrestore(&cpm_dpmem_lock, flags);

	return (uint)start;
	}
	EXPORT_SYMBOL(cpm_dpalloc);

	int cpm_dpfree(unsigned long offset)
	{
	int ret;
	unsigned long flags;

	spin_lock_irqsave(&cpm_dpmem_lock, flags);
	ret = rh_free(&cpm_dpmem_info, offset);
	spin_unlock_irqrestore(&cpm_dpmem_lock, flags);

	return ret;
	}
	EXPORT_SYMBOL(cpm_dpfree);

	unsigned long cpm_dpalloc_fixed(unsigned long offset, uint size, uint align)
	{
	unsigned long start;
	unsigned long flags;

	spin_lock_irqsave(&cpm_dpmem_lock, flags);
	cpm_dpmem_info.alignment = align;
	start = rh_alloc_fixed(&cpm_dpmem_info, offset, size, "commproc");
	spin_unlock_irqrestore(&cpm_dpmem_lock, flags);

	return start;
	}
	EXPORT_SYMBOL(cpm_dpalloc_fixed);

	void cpm_dpdump(void)
	{
	rh_dump(&cpm_dpmem_info);
	}
	EXPORT_SYMBOL(cpm_dpdump);

	void *cpm_dpram_addr(unsigned long offset)
	{
	return (void *)(dpram_vbase + offset);
	}
	EXPORT_SYMBOL(cpm_dpram_addr);

	uint cpm_dpram_phys(u8* addr)
	{
	return (dpram_pbase + (uint)(addr - dpram_vbase));
	}
	EXPORT_SYMBOL(cpm_dpram_addr);