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/*
* General Purpose functions for the global management of the
* 8260 Communication Processor Module.
* Copyright (c) 1999 Dan Malek (dmalek@jlc.net)
* Copyright (c) 2000 MontaVista Software, Inc (source@mvista.com)
* 2.3.99 Updates
*
* 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/bootmem.h>
#include <asm/irq.h>
#include <asm/mpc8260.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/immap_8260.h>
#include <asm/cpm_8260.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 */
cpm8260_t *cpmp; /* Pointer to comm processor space */
/* We allocate this here because it is used almost exclusively for
* the communication processor devices.
*/
immap_t *immr;
void
m8260_cpm_reset(void)
{
volatile immap_t *imp;
volatile cpm8260_t *commproc;
uint vpgaddr;
immr = imp = (volatile immap_t *)IMAP_ADDR;
commproc = &imp->im_cpm;
/* 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 =
(uint) alloc_bootmem_pages(PAGE_SIZE * NUM_CPM_HOST_PAGES);
host_end = host_buffer + (PAGE_SIZE * NUM_CPM_HOST_PAGES);
vpgaddr = host_buffer;
/* Tell everyone where the comm processor resides.
*/
cpmp = (cpm8260_t *)commproc;
}
/* Allocate some memory from the dual ported ram.
* To help protocols with object alignment restrictions, we do that
* if they ask.
*/
uint
m8260_cpm_dpalloc(uint size, uint align)
{
uint retloc;
uint align_mask, off;
uint savebase;
align_mask = align - 1;
savebase = dp_alloc_base;
if ((off = (dp_alloc_base & align_mask)) != 0)
dp_alloc_base += (align - off);
if ((dp_alloc_base + size) >= dp_alloc_top) {
dp_alloc_base = savebase;
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
m8260_cpm_hostalloc(uint size, uint align)
{
uint retloc;
uint align_mask, off;
uint savebase;
align_mask = align - 1;
savebase = host_buffer;
if ((off = (host_buffer & align_mask)) != 0)
host_buffer += (align - off);
if ((host_buffer + size) >= host_end) {
host_buffer = savebase;
return(0);
}
retloc = host_buffer;
host_buffer += size;
return(retloc);
}
/* 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 (((bd_t *)__res)->bi_brgfreq * 1000000)
#define BRG_UART_CLK (BRG_INT_CLK/16)
/* This function is used by UARTS, or anything else that uses a 16x
* oversampled clock.
*/
void
m8260_cpm_setbrg(uint brg, uint rate)
{
volatile uint *bp;
/* This is good enough to get SMCs running.....
*/
if (brg < 4) {
bp = (uint *)&immr->im_brgc1;
}
else {
bp = (uint *)&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
m8260_cpm_fastbrg(uint brg, uint rate, int div16)
{
volatile uint *bp;
/* This is good enough to get SMCs running.....
*/
if (brg < 4) {
bp = (uint *)&immr->im_brgc1;
}
else {
bp = (uint *)&immr->im_brgc5;
brg -= 4;
}
bp += brg;
*bp = ((BRG_INT_CLK / rate) << 1) | CPM_BRG_EN;
if (div16)
*bp |= CPM_BRG_DIV16;
}
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