/* * 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 */