redonkable/remarkable-linux
redonkable/remarkable-linux
1
0
Fork 0
Code Releases Activity

POWERPC: Move generic cpm2 stuff to powerpc

Browse source 
This moves the cpm2 common code and PIC stuff to the powerpc. Most of the files
were just copied from ppc/, with minor tuning to make it compile, and, subsequently, work.

Signed-off-by: Vitaly Bordug <vbordug@ru.mvista.com>
This commit is contained in:
Vitaly Bordug 2006-09-21 22:18:53 +04:00
parent 3dd0dcbe9d
commit b0c110b4f1
6 changed files with 489 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

5
arch/powerpc/lib/Makefile
View file

@ -20,3 +20,8 @@ ifeq ($(CONFIG_PPC64),y)
obj-$(CONFIG_SMP) += locks.o
obj-$(CONFIG_DEBUG_KERNEL) += sstep.o
endif
# Temporary hack until we have migrated to asm-powerpc
ifeq ($(CONFIG_PPC_MERGE),y)
obj-$(CONFIG_CPM2) += rheap.o
endif

5
arch/powerpc/sysdev/Makefile
View file

@ -17,3 +17,8 @@ ifeq ($(CONFIG_PPC_MERGE),y)
obj-$(CONFIG_PPC_I8259) += i8259.o
obj-$(CONFIG_PPC_83xx) += ipic.o
endif
# Temporary hack until we have migrated to asm-powerpc
ifeq ($(ARCH),powerpc)
obj-$(CONFIG_CPM2) += cpm2_common.o cpm2_pic.o
endif

210
arch/powerpc/sysdev/cpm2_common.c Normal file
View file

@ -0,0 +1,210 @@
/*
* 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;
#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);
/* 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 = (uint *)&cpm2_immr->im_brgc1;
} else {
bp = (uint *)&cpm2_immr->im_brgc5;
brg -= 4;
}
bp += brg;
*bp = ((BRG_UART_CLK / rate) << 1) | CPM_BRG_EN;
}
/* 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 = (uint *)&cpm2_immr->im_brgc1;
}
else {
bp = (uint *)&cpm2_immr->im_brgc5;
brg -= 4;
}
bp += brg;
*bp = ((BRG_INT_CLK / rate) << 1) | CPM_BRG_EN;
if (div16)
*bp |= 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;
static void cpm2_dpinit(void)
{
spin_lock_init(&cpm_dpmem_lock);
/* 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, (void *)CPM_DATAONLY_BASE,
CPM_DATAONLY_SIZE);
}
/* This function returns an index into the DPRAM area.
*/
uint cpm_dpalloc(uint size, uint align)
{
void *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(uint offset)
{
int ret;
unsigned long flags;
spin_lock_irqsave(&cpm_dpmem_lock, flags);
ret = rh_free(&cpm_dpmem_info, (void *)offset);
spin_unlock_irqrestore(&cpm_dpmem_lock, flags);
return ret;
}
EXPORT_SYMBOL(cpm_dpfree);
/* not sure if this is ever needed */
uint cpm_dpalloc_fixed(uint offset, uint size, uint align)
{
void *start;
unsigned long flags;
spin_lock_irqsave(&cpm_dpmem_lock, flags);
cpm_dpmem_info.alignment = align;
start = rh_alloc_fixed(&cpm_dpmem_info, (void *)offset, size, "commproc");
spin_unlock_irqrestore(&cpm_dpmem_lock, flags);
return (uint)start;
}
EXPORT_SYMBOL(cpm_dpalloc_fixed);
void cpm_dpdump(void)
{
rh_dump(&cpm_dpmem_info);
}
EXPORT_SYMBOL(cpm_dpdump);
void *cpm_dpram_addr(uint offset)
{
return (void *)&cpm2_immr->im_dprambase[offset];
}
EXPORT_SYMBOL(cpm_dpram_addr);

256
arch/powerpc/sysdev/cpm2_pic.c Normal file
View file

@ -0,0 +1,256 @@
/*
* Platform information definitions.
*
* Copied from arch/ppc/syslib/cpm2_pic.c with minor subsequent updates
* to make in work in arch/powerpc/. Original (c) belongs to Dan Malek.
*
* Author: Vitaly Bordug <vbordug@ru.mvista.com>
*
* 1999-2001 (c) Dan Malek <dan@embeddedalley.com>
* 2006 (c) MontaVista Software, Inc.
*
* 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.
*/
/* The CPM2 internal interrupt controller. It is usually
* the only interrupt controller.
* There are two 32-bit registers (high/low) for up to 64
* possible interrupts.
*
* Now, the fun starts.....Interrupt Numbers DO NOT MAP
* in a simple arithmetic fashion to mask or pending registers.
* That is, interrupt 4 does not map to bit position 4.
* We create two tables, indexed by vector number, to indicate
* which register to use and which bit in the register to use.
*/
#include <linux/stddef.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/signal.h>
#include <linux/irq.h>
#include <asm/immap_cpm2.h>
#include <asm/mpc8260.h>
#include <asm/io.h>
#include <asm/prom.h>
#include "cpm2_pic.h"
static struct device_node *cpm2_pic_node;
static struct irq_host *cpm2_pic_host;
#define NR_MASK_WORDS ((NR_IRQS + 31) / 32)
static unsigned long ppc_cached_irq_mask[NR_MASK_WORDS];
static const u_char irq_to_siureg[] = {
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0
};
/* bit numbers do not match the docs, these are precomputed so the bit for
* a given irq is (1 << irq_to_siubit[irq]) */
static const u_char irq_to_siubit[] = {
0, 15, 14, 13, 12, 11, 10, 9,
8, 7, 6, 5, 4, 3, 2, 1,
2, 1, 0, 14, 13, 12, 11, 10,
9, 8, 7, 6, 5, 4, 3, 0,
31, 30, 29, 28, 27, 26, 25, 24,
23, 22, 21, 20, 19, 18, 17, 16,
16, 17, 18, 19, 20, 21, 22, 23,
24, 25, 26, 27, 28, 29, 30, 31,
};
static void cpm2_mask_irq(unsigned int irq_nr)
{
int bit, word;
volatile uint *simr;
irq_nr -= CPM_IRQ_OFFSET;
bit = irq_to_siubit[irq_nr];
word = irq_to_siureg[irq_nr];
simr = &(cpm2_immr->im_intctl.ic_simrh);
ppc_cached_irq_mask[word] &= ~(1 << bit);
simr[word] = ppc_cached_irq_mask[word];
}
static void cpm2_unmask_irq(unsigned int irq_nr)
{
int bit, word;
volatile uint *simr;
irq_nr -= CPM_IRQ_OFFSET;
bit = irq_to_siubit[irq_nr];
word = irq_to_siureg[irq_nr];
simr = &(cpm2_immr->im_intctl.ic_simrh);
ppc_cached_irq_mask[word] |= 1 << bit;
simr[word] = ppc_cached_irq_mask[word];
}
static void cpm2_mask_and_ack(unsigned int irq_nr)
{
int bit, word;
volatile uint *simr, *sipnr;
irq_nr -= CPM_IRQ_OFFSET;
bit = irq_to_siubit[irq_nr];
word = irq_to_siureg[irq_nr];
simr = &(cpm2_immr->im_intctl.ic_simrh);
sipnr = &(cpm2_immr->im_intctl.ic_sipnrh);
ppc_cached_irq_mask[word] &= ~(1 << bit);
simr[word] = ppc_cached_irq_mask[word];
sipnr[word] = 1 << bit;
}
static void cpm2_end_irq(unsigned int irq_nr)
{
int bit, word;
volatile uint *simr;
if (!(irq_desc[irq_nr].status & (IRQ_DISABLED|IRQ_INPROGRESS))
&& irq_desc[irq_nr].action) {
irq_nr -= CPM_IRQ_OFFSET;
bit = irq_to_siubit[irq_nr];
word = irq_to_siureg[irq_nr];
simr = &(cpm2_immr->im_intctl.ic_simrh);
ppc_cached_irq_mask[word] |= 1 << bit;
simr[word] = ppc_cached_irq_mask[word];
/*
* Work around large numbers of spurious IRQs on PowerPC 82xx
* systems.
*/
mb();
}
}
static struct irq_chip cpm2_pic = {
.typename = " CPM2 SIU ",
.enable = cpm2_unmask_irq,
.disable = cpm2_mask_irq,
.unmask = cpm2_unmask_irq,
.mask_ack = cpm2_mask_and_ack,
.end = cpm2_end_irq,
};
int cpm2_get_irq(struct pt_regs *regs)
{
int irq;
unsigned long bits;
/* For CPM2, read the SIVEC register and shift the bits down
* to get the irq number.*/
bits = cpm2_immr->im_intctl.ic_sivec;
irq = bits >> 26;
if (irq == 0)
return(-1);
return irq+CPM_IRQ_OFFSET;
}
static int cpm2_pic_host_match(struct irq_host *h, struct device_node *node)
{
return cpm2_pic_node == NULL || cpm2_pic_node == node;
}
static int cpm2_pic_host_map(struct irq_host *h, unsigned int virq,
irq_hw_number_t hw)
{
pr_debug("cpm2_pic_host_map(%d, 0x%lx)\n", virq, hw);
get_irq_desc(virq)->status |= IRQ_LEVEL;
set_irq_chip_and_handler(virq, &cpm2_pic, handle_level_irq);
return 0;
}
static void cpm2_host_unmap(struct irq_host *h, unsigned int virq)
{
/* Make sure irq is masked in hardware */
cpm2_mask_irq(virq);
/* remove chip and handler */
set_irq_chip_and_handler(virq, NULL, NULL);
}
static int cpm2_pic_host_xlate(struct irq_host *h, struct device_node *ct,
u32 *intspec, unsigned int intsize,
irq_hw_number_t *out_hwirq, unsigned int *out_flags)
{
static const unsigned char map_cpm2_senses[4] = {
IRQ_TYPE_LEVEL_LOW,
IRQ_TYPE_LEVEL_HIGH,
IRQ_TYPE_EDGE_FALLING,
IRQ_TYPE_EDGE_RISING,
};
*out_hwirq = intspec[0];
if (intsize > 1 && intspec[1] < 4)
*out_flags = map_cpm2_senses[intspec[1]];
else
*out_flags = IRQ_TYPE_NONE;
return 0;
}
static struct irq_host_ops cpm2_pic_host_ops = {
.match = cpm2_pic_host_match,
.map = cpm2_pic_host_map,
.unmap = cpm2_host_unmap,
.xlate = cpm2_pic_host_xlate,
};
void cpm2_pic_init(struct device_node *node)
{
int i;
/* Clear the CPM IRQ controller, in case it has any bits set
* from the bootloader
*/
/* Mask out everything */
cpm2_immr->im_intctl.ic_simrh = 0x00000000;
cpm2_immr->im_intctl.ic_simrl = 0x00000000;
wmb();
/* Ack everything */
cpm2_immr->im_intctl.ic_sipnrh = 0xffffffff;
cpm2_immr->im_intctl.ic_sipnrl = 0xffffffff;
wmb();
/* Dummy read of the vector */
i = cpm2_immr->im_intctl.ic_sivec;
rmb();
/* Initialize the default interrupt mapping priorities,
* in case the boot rom changed something on us.
*/
cpm2_immr->im_intctl.ic_sicr = 0;
cpm2_immr->im_intctl.ic_scprrh = 0x05309770;
cpm2_immr->im_intctl.ic_scprrl = 0x05309770;
/* create a legacy host */
if (node)
cpm2_pic_node = of_node_get(node);
cpm2_pic_host = irq_alloc_host(IRQ_HOST_MAP_LINEAR, 64, &cpm2_pic_host_ops, 64);
if (cpm2_pic_host == NULL) {
printk(KERN_ERR "CPM2 PIC: failed to allocate irq host!\n");
return;
}
}

8
arch/powerpc/sysdev/cpm2_pic.h Normal file
View file

@ -0,0 +1,8 @@
#ifndef _PPC_KERNEL_CPM2_H
#define _PPC_KERNEL_CPM2_H
extern int cpm2_get_irq(struct pt_regs *regs);
extern void cpm2_pic_init(struct device_node*);
#endif /* _PPC_KERNEL_CPM2_H */

6
include/asm-ppc/cpm2.h
View file

@ -42,6 +42,8 @@
#define CPM_CR_IDMA4_SBLOCK (0x17)
#define CPM_CR_MCC1_SBLOCK (0x1c)
#define CPM_CR_FCC_SBLOCK(x) (x + 0x10)
#define CPM_CR_SCC1_PAGE (0x00)
#define CPM_CR_SCC2_PAGE (0x01)
#define CPM_CR_SCC3_PAGE (0x02)
@ -62,6 +64,8 @@
#define CPM_CR_MCC1_PAGE (0x07)
#define CPM_CR_MCC2_PAGE (0x08)
#define CPM_CR_FCC_PAGE(x) (x + 0x04)
/* Some opcodes (there are more...later)
*/
#define CPM_CR_INIT_TRX ((ushort)0x0000)
@ -1186,7 +1190,7 @@ typedef struct im_idma {
#define FCC_MEM_OFFSET(x) (CPM_FCC_SPECIAL_BASE + (x*128))
#define FCC1_MEM_OFFSET FCC_MEM_OFFSET(0)
#define FCC2_MEM_OFFSET FCC_MEM_OFFSET(1)
#define FCC2_MEM_OFFSET FCC_MEM_OFFSET(2)
#define FCC3_MEM_OFFSET FCC_MEM_OFFSET(2)
#endif /* __CPM2__ */
#endif /* __KERNEL__ */