arch/powerpc/sysdev/cpm2_common.c - arm/linux-arm64-legacy - Git at Google

 /*
  * General Purpose functions for the global management of the
  * 8260 Communication Processor Module.
  * Copyright (c) 1999-2001 Dan Malek <dan@embeddedalley.com>
  * Copyright (c) 2000 MontaVista Software, Inc (source@mvista.com)
  *	2.3.99 Updates
  *
  * 2006 (c) MontaVista Software, Inc.
  * Vitaly Bordug <vbordug@ru.mvista.com>
  * 	Merged to arch/powerpc from arch/ppc/syslib/cpm2_common.c
  *
  * This file is licensed under the terms of the GNU General Public License
  * version 2. This program is licensed "as is" without any warranty of any
  * kind, whether express or implied.
  */

 /*
  *
  * 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.
  */
 #include <linux/errno.h>
 #include <linux/sched.h>
 #include <linux/kernel.h>
 #include <linux/param.h>
 #include <linux/string.h>
 #include <linux/mm.h>
 #include <linux/interrupt.h>
 #include <linux/module.h>
 #include <asm/io.h>
 #include <asm/irq.h>
 #include <asm/mpc8260.h>
 #include <asm/page.h>
 #include <asm/pgtable.h>
 #include <asm/cpm2.h>
 #include <asm/rheap.h>
 #include <asm/fs_pd.h>

 #include <sysdev/fsl_soc.h>

 static void cpm2_dpinit(void);
 cpm_cpm2_t	*cpmp;		/* Pointer to comm processor space */

 /* We allocate this here because it is used almost exclusively for
  * the communication processor devices.
  */
 cpm2_map_t *cpm2_immr;
 intctl_cpm2_t *cpm2_intctl;

 #define CPM_MAP_SIZE	(0x40000)	/* 256k - the PQ3 reserve this amount
 					   of space for CPM as it is larger
 					   than on PQ2 */

 void
 cpm2_reset(void)
 {
 	cpm2_immr = (cpm2_map_t *)ioremap(CPM_MAP_ADDR, CPM_MAP_SIZE);
 	cpm2_intctl = cpm2_map(im_intctl);

 	/* Reclaim the DP memory for our use.
 	 */
 	cpm2_dpinit();

 	/* Tell everyone where the comm processor resides.
 	 */
 	cpmp = &cpm2_immr->im_cpm;
 }

 /* Set a baud rate generator.  This needs lots of work.  There are
  * eight BRGs, which can be connected to the CPM channels or output
  * as clocks.  The BRGs are in two different block of internal
  * memory mapped space.
  * The baud rate clock is the system clock divided by something.
  * It was set up long ago during the initial boot phase and is
  * is given to us.
  * Baud rate clocks are zero-based in the driver code (as that maps
  * to port numbers).  Documentation uses 1-based numbering.
  */
 #define BRG_INT_CLK	(get_brgfreq())
 #define BRG_UART_CLK	(BRG_INT_CLK/16)

 /* This function is used by UARTS, or anything else that uses a 16x
  * oversampled clock.
  */
 void
 cpm_setbrg(uint brg, uint rate)
 {
 	volatile uint	*bp;

 	/* This is good enough to get SMCs running.....
 	*/
 	if (brg < 4) {
 		bp = cpm2_map_size(im_brgc1, 16);
 	} else {
 		bp = cpm2_map_size(im_brgc5, 16);
 		brg -= 4;
 	}
 	bp += brg;
 	*bp = ((BRG_UART_CLK / rate) << 1) | CPM_BRG_EN;

 	cpm2_unmap(bp);
 }

 /* This function is used to set high speed synchronous baud rate
  * clocks.
  */
 void
 cpm2_fastbrg(uint brg, uint rate, int div16)
 {
 	volatile uint	*bp;

 	if (brg < 4) {
 		bp = cpm2_map_size(im_brgc1, 16);
 	}
 	else {
 		bp = cpm2_map_size(im_brgc5, 16);
 		brg -= 4;
 	}
 	bp += brg;
 	*bp = ((BRG_INT_CLK / rate) << 1) | CPM_BRG_EN;
 	if (div16)
 		*bp |= CPM_BRG_DIV16;

 	cpm2_unmap(bp);
 }

 int cpm2_clk_setup(enum cpm_clk_target target, int clock, int mode)
 {
 	int ret = 0;
 	int shift;
 	int i, bits = 0;
 	cpmux_t *im_cpmux;
 	u32 *reg;
 	u32 mask = 7;
 	u8 clk_map [24][3] = {
 		{CPM_CLK_FCC1, CPM_BRG5, 0},
 		{CPM_CLK_FCC1, CPM_BRG6, 1},
 		{CPM_CLK_FCC1, CPM_BRG7, 2},
 		{CPM_CLK_FCC1, CPM_BRG8, 3},
 		{CPM_CLK_FCC1, CPM_CLK9, 4},
 		{CPM_CLK_FCC1, CPM_CLK10, 5},
 		{CPM_CLK_FCC1, CPM_CLK11, 6},
 		{CPM_CLK_FCC1, CPM_CLK12, 7},
 		{CPM_CLK_FCC2, CPM_BRG5, 0},
 		{CPM_CLK_FCC2, CPM_BRG6, 1},
 		{CPM_CLK_FCC2, CPM_BRG7, 2},
 		{CPM_CLK_FCC2, CPM_BRG8, 3},
 		{CPM_CLK_FCC2, CPM_CLK13, 4},
 		{CPM_CLK_FCC2, CPM_CLK14, 5},
 		{CPM_CLK_FCC2, CPM_CLK15, 6},
 		{CPM_CLK_FCC2, CPM_CLK16, 7},
 		{CPM_CLK_FCC3, CPM_BRG5, 0},
 		{CPM_CLK_FCC3, CPM_BRG6, 1},
 		{CPM_CLK_FCC3, CPM_BRG7, 2},
 		{CPM_CLK_FCC3, CPM_BRG8, 3},
 		{CPM_CLK_FCC3, CPM_CLK13, 4},
 		{CPM_CLK_FCC3, CPM_CLK14, 5},
 		{CPM_CLK_FCC3, CPM_CLK15, 6},
 		{CPM_CLK_FCC3, CPM_CLK16, 7}
 		};

 	im_cpmux = cpm2_map(im_cpmux);

 	switch (target) {
 	case CPM_CLK_SCC1:
 		reg = &im_cpmux->cmx_scr;
 		shift = 24;
 	case CPM_CLK_SCC2:
 		reg = &im_cpmux->cmx_scr;
 		shift = 16;
 		break;
 	case CPM_CLK_SCC3:
 		reg = &im_cpmux->cmx_scr;
 		shift = 8;
 		break;
 	case CPM_CLK_SCC4:
 		reg = &im_cpmux->cmx_scr;
 		shift = 0;
 		break;
 	case CPM_CLK_FCC1:
 		reg = &im_cpmux->cmx_fcr;
 		shift = 24;
 		break;
 	case CPM_CLK_FCC2:
 		reg = &im_cpmux->cmx_fcr;
 		shift = 16;
 		break;
 	case CPM_CLK_FCC3:
 		reg = &im_cpmux->cmx_fcr;
 		shift = 8;
 		break;
 	default:
 		printk(KERN_ERR "cpm2_clock_setup: invalid clock target\n");
 		return -EINVAL;
 	}

 	if (mode == CPM_CLK_RX)
 		shift +=3;

 	for (i=0; i<24; i++) {
 		if (clk_map[i][0] == target && clk_map[i][1] == clock) {
 			bits = clk_map[i][2];
 			break;
 		}
 	}
 	if (i == sizeof(clk_map)/3)
 	    ret = -EINVAL;

 	bits <<= shift;
 	mask <<= shift;
 	out_be32(reg, (in_be32(reg) & ~mask) | bits);

 	cpm2_unmap(im_cpmux);
 	return ret;
 }

 /*
  * 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;
 static u8* im_dprambase;

 static void cpm2_dpinit(void)
 {
 	spin_lock_init(&cpm_dpmem_lock);

 	im_dprambase = ioremap(CPM_MAP_ADDR, CPM_DATAONLY_BASE + CPM_DATAONLY_SIZE);

 	/* initialize the info header */
 	rh_init(&cpm_dpmem_info, 1,
 			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 is only a subset of the available dpram. It
 	 * varies with the processor and the microcode patches activated.
 	 * But the following should be at least safe.
 	 */
 	rh_attach_region(&cpm_dpmem_info, CPM_DATAONLY_BASE, CPM_DATAONLY_SIZE);
 }

 /* This function returns an index into the DPRAM 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);

 /* not sure if this is ever needed */
 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 *)(im_dprambase + offset);
 }
 EXPORT_SYMBOL(cpm_dpram_addr);
	/*
	* General Purpose functions for the global management of the
	* 8260 Communication Processor Module.
	* Copyright (c) 1999-2001 Dan Malek <dan@embeddedalley.com>
	* Copyright (c) 2000 MontaVista Software, Inc (source@mvista.com)
	* 2.3.99 Updates
	*
	* 2006 (c) MontaVista Software, Inc.
	* Vitaly Bordug <vbordug@ru.mvista.com>
	* Merged to arch/powerpc from arch/ppc/syslib/cpm2_common.c
	*
	* This file is licensed under the terms of the GNU General Public License
	* version 2. This program is licensed "as is" without any warranty of any
	* kind, whether express or implied.
	*/

	/*
	*
	* 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.
	*/
	#include <linux/errno.h>
	#include <linux/sched.h>
	#include <linux/kernel.h>
	#include <linux/param.h>
	#include <linux/string.h>
	#include <linux/mm.h>
	#include <linux/interrupt.h>
	#include <linux/module.h>
	#include <asm/io.h>
	#include <asm/irq.h>
	#include <asm/mpc8260.h>
	#include <asm/page.h>
	#include <asm/pgtable.h>
	#include <asm/cpm2.h>
	#include <asm/rheap.h>
	#include <asm/fs_pd.h>

	#include <sysdev/fsl_soc.h>

	static void cpm2_dpinit(void);
	cpm_cpm2_t cpmp; / Pointer to comm processor space */

	/* We allocate this here because it is used almost exclusively for
	* the communication processor devices.
	*/
	cpm2_map_t *cpm2_immr;
	intctl_cpm2_t *cpm2_intctl;

	#define CPM_MAP_SIZE (0x40000) /* 256k - the PQ3 reserve this amount
	of space for CPM as it is larger
	than on PQ2 */

	void
	cpm2_reset(void)
	{
	cpm2_immr = (cpm2_map_t *)ioremap(CPM_MAP_ADDR, CPM_MAP_SIZE);
	cpm2_intctl = cpm2_map(im_intctl);

	/* Reclaim the DP memory for our use.
	*/
	cpm2_dpinit();

	/* Tell everyone where the comm processor resides.
	*/
	cpmp = &cpm2_immr->im_cpm;
	}

	/* Set a baud rate generator. This needs lots of work. There are
	* eight BRGs, which can be connected to the CPM channels or output
	* as clocks. The BRGs are in two different block of internal
	* memory mapped space.
	* The baud rate clock is the system clock divided by something.
	* It was set up long ago during the initial boot phase and is
	* is given to us.
	* Baud rate clocks are zero-based in the driver code (as that maps
	* to port numbers). Documentation uses 1-based numbering.
	*/
	#define BRG_INT_CLK (get_brgfreq())
	#define BRG_UART_CLK (BRG_INT_CLK/16)

	/* This function is used by UARTS, or anything else that uses a 16x
	* oversampled clock.
	*/
	void
	cpm_setbrg(uint brg, uint rate)
	{
	volatile uint *bp;

	/* This is good enough to get SMCs running.....
	*/
	if (brg < 4) {
	bp = cpm2_map_size(im_brgc1, 16);
	} else {
	bp = cpm2_map_size(im_brgc5, 16);
	brg -= 4;
	}
	bp += brg;
	*bp = ((BRG_UART_CLK / rate) << 1) \| CPM_BRG_EN;

	cpm2_unmap(bp);
	}

	/* This function is used to set high speed synchronous baud rate
	* clocks.
	*/
	void
	cpm2_fastbrg(uint brg, uint rate, int div16)
	{
	volatile uint *bp;

	if (brg < 4) {
	bp = cpm2_map_size(im_brgc1, 16);
	}
	else {
	bp = cpm2_map_size(im_brgc5, 16);
	brg -= 4;
	}
	bp += brg;
	*bp = ((BRG_INT_CLK / rate) << 1) \| CPM_BRG_EN;
	if (div16)
	*bp \|= CPM_BRG_DIV16;

	cpm2_unmap(bp);
	}

	int cpm2_clk_setup(enum cpm_clk_target target, int clock, int mode)
	{
	int ret = 0;
	int shift;
	int i, bits = 0;
	cpmux_t *im_cpmux;
	u32 *reg;
	u32 mask = 7;
	u8 clk_map [24][3] = {
	{CPM_CLK_FCC1, CPM_BRG5, 0},
	{CPM_CLK_FCC1, CPM_BRG6, 1},
	{CPM_CLK_FCC1, CPM_BRG7, 2},
	{CPM_CLK_FCC1, CPM_BRG8, 3},
	{CPM_CLK_FCC1, CPM_CLK9, 4},
	{CPM_CLK_FCC1, CPM_CLK10, 5},
	{CPM_CLK_FCC1, CPM_CLK11, 6},
	{CPM_CLK_FCC1, CPM_CLK12, 7},
	{CPM_CLK_FCC2, CPM_BRG5, 0},
	{CPM_CLK_FCC2, CPM_BRG6, 1},
	{CPM_CLK_FCC2, CPM_BRG7, 2},
	{CPM_CLK_FCC2, CPM_BRG8, 3},
	{CPM_CLK_FCC2, CPM_CLK13, 4},
	{CPM_CLK_FCC2, CPM_CLK14, 5},
	{CPM_CLK_FCC2, CPM_CLK15, 6},
	{CPM_CLK_FCC2, CPM_CLK16, 7},
	{CPM_CLK_FCC3, CPM_BRG5, 0},
	{CPM_CLK_FCC3, CPM_BRG6, 1},
	{CPM_CLK_FCC3, CPM_BRG7, 2},
	{CPM_CLK_FCC3, CPM_BRG8, 3},
	{CPM_CLK_FCC3, CPM_CLK13, 4},
	{CPM_CLK_FCC3, CPM_CLK14, 5},
	{CPM_CLK_FCC3, CPM_CLK15, 6},
	{CPM_CLK_FCC3, CPM_CLK16, 7}
	};

	im_cpmux = cpm2_map(im_cpmux);

	switch (target) {
	case CPM_CLK_SCC1:
	reg = &im_cpmux->cmx_scr;
	shift = 24;
	case CPM_CLK_SCC2:
	reg = &im_cpmux->cmx_scr;
	shift = 16;
	break;
	case CPM_CLK_SCC3:
	reg = &im_cpmux->cmx_scr;
	shift = 8;
	break;
	case CPM_CLK_SCC4:
	reg = &im_cpmux->cmx_scr;
	shift = 0;
	break;
	case CPM_CLK_FCC1:
	reg = &im_cpmux->cmx_fcr;
	shift = 24;
	break;
	case CPM_CLK_FCC2:
	reg = &im_cpmux->cmx_fcr;
	shift = 16;
	break;
	case CPM_CLK_FCC3:
	reg = &im_cpmux->cmx_fcr;
	shift = 8;
	break;
	default:
	printk(KERN_ERR "cpm2_clock_setup: invalid clock target\n");
	return -EINVAL;
	}

	if (mode == CPM_CLK_RX)
	shift +=3;

	for (i=0; i<24; i++) {
	if (clk_map[i][0] == target && clk_map[i][1] == clock) {
	bits = clk_map[i][2];
	break;
	}
	}
	if (i == sizeof(clk_map)/3)
	ret = -EINVAL;

	bits <<= shift;
	mask <<= shift;
	out_be32(reg, (in_be32(reg) & ~mask) \| bits);

	cpm2_unmap(im_cpmux);
	return ret;
	}

	/*
	* 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;
	static u8* im_dprambase;

	static void cpm2_dpinit(void)
	{
	spin_lock_init(&cpm_dpmem_lock);

	im_dprambase = ioremap(CPM_MAP_ADDR, CPM_DATAONLY_BASE + CPM_DATAONLY_SIZE);

	/* initialize the info header */
	rh_init(&cpm_dpmem_info, 1,
	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 is only a subset of the available dpram. It
	* varies with the processor and the microcode patches activated.
	* But the following should be at least safe.
	*/
	rh_attach_region(&cpm_dpmem_info, CPM_DATAONLY_BASE, CPM_DATAONLY_SIZE);
	}

	/* This function returns an index into the DPRAM 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);

	/* not sure if this is ever needed */
	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 *)(im_dprambase + offset);
	}
	EXPORT_SYMBOL(cpm_dpram_addr);