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/*
* General Purpose functions for the global management of the
* Communication Processor Module.
* Copyright (c) 1997 Dan Malek (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/config.h>
#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 <asm/irq.h>
#ifdef CONFIG_MBX
#include <asm/mbx.h>
#endif
#ifdef CONFIG_FADS
#include <asm/fads.h>
#endif
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/8xx_immap.h>
#include "commproc.h"
static uint dp_alloc_base; /* Starting offset in DP ram */
static uint dp_alloc_top; /* Max offset + 1 */
static uint host_buffer; /* One page of host buffer */
static uint host_end; /* end + 1 */
cpm8xx_t *cpmp; /* Pointer to comm processor space */
/* CPM interrupt vector functions.
*/
struct cpm_action {
void (*handler)(void *);
void *dev_id;
};
static struct cpm_action cpm_vecs[CPMVEC_NR];
static void cpm_interrupt(int irq, void * dev, struct pt_regs * regs);
static void cpm_error_interrupt(void *);
void
m8xx_cpm_reset(uint host_page_addr)
{
volatile immap_t *imp;
volatile cpm8xx_t *commproc;
pte_t *pte;
imp = (immap_t *)IMAP_ADDR;
commproc = (cpm8xx_t *)&imp->im_cpm;
#ifdef notdef
/* We can't do this. It seems to blow away the microcode
* patch that EPPC-Bug loaded for us. EPPC-Bug uses SCC1 for
* Ethernet, SMC1 for the console, and I2C for serial EEPROM.
* Our own drivers quickly reset all of these.
*/
/* Perform a reset.
*/
commproc->cp_cpcr = (CPM_CR_RST | CPM_CR_FLG);
/* Wait for it.
*/
while (commproc->cp_cpcr & CPM_CR_FLG);
#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).
*/
imp->im_siu_conf.sc_sdcr = 1;
/* Reclaim the DP memory for our use.
*/
dp_alloc_base = CPM_DATAONLY_BASE;
dp_alloc_top = dp_alloc_base + CPM_DATAONLY_SIZE;
/* Set the host page for allocation.
*/
host_buffer = host_page_addr; /* Host virtual page address */
host_end = host_page_addr + PAGE_SIZE;
pte = va_to_pte(&init_task, host_page_addr);
pte_val(*pte) |= _PAGE_NO_CACHE;
flush_tlb_page(current->mm->mmap, host_buffer);
/* Tell everyone where the comm processor resides.
*/
cpmp = (cpm8xx_t *)commproc;
/* Initialize the CPM interrupt controller.
*/
((immap_t *)IMAP_ADDR)->im_cpic.cpic_cicr =
(CICR_SCD_SCC4 | CICR_SCC_SCC3 | CICR_SCB_SCC2 | CICR_SCA_SCC1) |
(((5)/2) << 13) | CICR_HP_MASK;
/* I hard coded the CPM interrupt to 5 above
* since the CPM_INTERRUPT define is relative to
* the linux irq structure not what the hardware
* belives. -- Cort
*/
((immap_t *)IMAP_ADDR)->im_cpic.cpic_cimr = 0;
/* Set our interrupt handler with the core CPU.
*/
if (request_irq(CPM_INTERRUPT, cpm_interrupt, 0, "cpm", NULL) != 0)
panic("Could not allocate CPM IRQ!");
/* Install our own error handler.
*/
cpm_install_handler(CPMVEC_ERROR, cpm_error_interrupt, NULL);
((immap_t *)IMAP_ADDR)->im_cpic.cpic_cicr |= CICR_IEN;
}
/* CPM interrupt controller interrupt.
*/
static void
cpm_interrupt(int irq, void * dev, struct pt_regs * regs)
{
uint vec;
/* Get the vector by setting the ACK bit and then reading
* the register.
*/
((volatile immap_t *)IMAP_ADDR)->im_cpic.cpic_civr = 1;
vec = ((volatile immap_t *)IMAP_ADDR)->im_cpic.cpic_civr;
vec >>= 11;
if (cpm_vecs[vec].handler != 0)
(*cpm_vecs[vec].handler)(cpm_vecs[vec].dev_id);
else
((immap_t *)IMAP_ADDR)->im_cpic.cpic_cimr &= ~(1 << vec);
/* After servicing the interrupt, we have to remove the status
* indicator.
*/
((immap_t *)IMAP_ADDR)->im_cpic.cpic_cisr |= (1 << vec);
}
/* 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 void
cpm_error_interrupt(void *dev)
{
}
/* Install a CPM interrupt handler.
*/
void
cpm_install_handler(int vec, void (*handler)(void *), void *dev_id)
{
if (cpm_vecs[vec].handler != 0)
printk("CPM interrupt %x replacing %x\n",
(uint)handler, (uint)cpm_vecs[vec].handler);
cpm_vecs[vec].handler = handler;
cpm_vecs[vec].dev_id = dev_id;
((immap_t *)IMAP_ADDR)->im_cpic.cpic_cimr |= (1 << vec);
}
/* Allocate some memory from the dual ported ram. We may want to
* enforce alignment restrictions, but right now everyone is a good
* citizen.
*/
uint
m8xx_cpm_dpalloc(uint size)
{
uint retloc;
if ((dp_alloc_base + size) >= dp_alloc_top)
return(CPM_DP_NOSPACE);
retloc = dp_alloc_base;
dp_alloc_base += size;
return(retloc);
}
/* 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 + 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 (((bd_t *)res)->bi_intfreq * 1000000)
#define BRG_UART_CLK (BRG_INT_CLK/16)
void
m8xx_cpm_setbrg(uint brg, uint rate)
{
volatile uint *bp;
/* This is good enough to get SMCs running.....
*/
bp = (uint *)&cpmp->cp_brgc1;
bp += brg;
*bp = ((BRG_UART_CLK / rate) << 1) | CPM_BRG_EN;
}
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