+++ /dev/null
-/*
- * This file is based on "arch/ppc/8260_io/commproc.c" - here is it's
- * copyright notice:
- *
- * 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 <common.h>
-#include <asm/cpm_8260.h>
-
-DECLARE_GLOBAL_DATA_PTR;
-
-void
-m8260_cpm_reset(void)
-{
- volatile immap_t *immr = (immap_t *)CONFIG_SYS_IMMR;
- volatile ulong count;
-
- /* Reclaim the DP memory for our use.
- */
- gd->dp_alloc_base = CPM_DATAONLY_BASE;
- gd->dp_alloc_top = gd->dp_alloc_base + CPM_DATAONLY_SIZE;
-
- /*
- * Reset CPM
- */
- immr->im_cpm.cp_cpcr = CPM_CR_RST;
- count = 0;
- do { /* Spin until command processed */
- __asm__ __volatile__ ("eieio");
- } while ((immr->im_cpm.cp_cpcr & CPM_CR_FLG) && ++count < 1000000);
-
-#ifdef CONFIG_HARD_I2C
- *((unsigned short*)(&immr->im_dprambase[PROFF_I2C_BASE])) = 0;
-#endif
-}
-
-/* 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)
-{
- volatile immap_t *immr = (immap_t *)CONFIG_SYS_IMMR;
- uint retloc;
- uint align_mask, off;
- uint savebase;
-
- align_mask = align - 1;
- savebase = gd->dp_alloc_base;
-
- if ((off = (gd->dp_alloc_base & align_mask)) != 0)
- gd->dp_alloc_base += (align - off);
-
- if ((off = size & align_mask) != 0)
- size += align - off;
-
- if ((gd->dp_alloc_base + size) >= gd->dp_alloc_top) {
- gd->dp_alloc_base = savebase;
- panic("m8260_cpm_dpalloc: ran out of dual port ram!");
- }
-
- retloc = gd->dp_alloc_base;
- gd->dp_alloc_base += size;
-
- memset((void *)&immr->im_dprambase[retloc], 0, 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)
-{
- /* the host might not even have RAM yet - just use dual port RAM */
- return (m8260_cpm_dpalloc(size, align));
-}
-
-/* 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 gd->brg_clk
-#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 immap_t *immr = (immap_t *)CONFIG_SYS_IMMR;
- volatile uint *bp;
- uint cd = BRG_UART_CLK / rate;
-
- if ((BRG_UART_CLK % rate) < (rate / 2))
- cd--;
- if (brg < 4) {
- bp = (uint *)&immr->im_brgc1;
- }
- else {
- bp = (uint *)&immr->im_brgc5;
- brg -= 4;
- }
- bp += brg;
- *bp = (cd << 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 immap_t *immr = (immap_t *)CONFIG_SYS_IMMR;
- 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)/rate)-1)&0xfff)<<1)|CPM_BRG_EN;
- if (div16)
- *bp |= CPM_BRG_DIV16;
-}
-
-/* This function is used to set baud rate generators using an external
- * clock source and 16x oversampling.
- */
-
-void
-m8260_cpm_extcbrg(uint brg, uint rate, uint extclk, int pinsel)
-{
- volatile immap_t *immr = (immap_t *)CONFIG_SYS_IMMR;
- volatile uint *bp;
-
- if (brg < 4) {
- bp = (uint *)&immr->im_brgc1;
- }
- else {
- bp = (uint *)&immr->im_brgc5;
- brg -= 4;
- }
- bp += brg;
- *bp = ((((((extclk/16)+rate-1)/rate)-1)&0xfff)<<1)|CPM_BRG_EN;
- if (pinsel == 0)
- *bp |= CPM_BRG_EXTC_CLK3_9;
- else
- *bp |= CPM_BRG_EXTC_CLK5_15;
-}
-
-#if defined(CONFIG_POST) || defined(CONFIG_LOGBUFFER)
-
-void post_word_store (ulong a)
-{
- volatile ulong *save_addr =
- (volatile ulong *)(CONFIG_SYS_IMMR + CPM_POST_WORD_ADDR);
-
- *save_addr = a;
-}
-
-ulong post_word_load (void)
-{
- volatile ulong *save_addr =
- (volatile ulong *)(CONFIG_SYS_IMMR + CPM_POST_WORD_ADDR);
-
- return *save_addr;
-}
-
-#endif /* CONFIG_POST || CONFIG_LOGBUFFER*/
-
-#ifdef CONFIG_BOOTCOUNT_LIMIT
-
-void bootcount_store (ulong a)
-{
- volatile ulong *save_addr =
- (volatile ulong *)(CONFIG_SYS_IMMR + CPM_BOOTCOUNT_ADDR);
-
- save_addr[0] = a;
- save_addr[1] = BOOTCOUNT_MAGIC;
-}
-
-ulong bootcount_load (void)
-{
- volatile ulong *save_addr =
- (volatile ulong *)(CONFIG_SYS_IMMR + CPM_BOOTCOUNT_ADDR);
-
- if (save_addr[1] != BOOTCOUNT_MAGIC)
- return 0;
- else
- return save_addr[0];
-}
-
-#endif /* CONFIG_BOOTCOUNT_LIMIT */
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