/* * General Purpose functions for the global management of the * Communication Processor Module. * Copyright (c) 1997 Dan error_act (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/errno.h> #include <linux/sched.h> #include <linux/kernel.h> #include <linux/dma-mapping.h> #include <linux/param.h> #include <linux/string.h> #include <linux/mm.h> #include <linux/interrupt.h> #include <linux/irq.h> #include <linux/module.h> #include <asm/mpc8xx.h> #include <asm/page.h> #include <asm/pgtable.h> #include <asm/8xx_immap.h> #include <asm/commproc.h> #include <asm/io.h> #include <asm/tlbflush.h> #include <asm/rheap.h> #include <asm/prom.h> #include <asm/fs_pd.h> #define CPM_MAP_SIZE (0x4000) static void m8xx_cpm_dpinit(void); static uint host_buffer; /* One page of host buffer */ static uint host_end; /* end + 1 */ cpm8xx_t *cpmp; /* Pointer to comm processor space */ cpic8xx_t *cpic_reg; static struct device_node *cpm_pic_node; static struct irq_host *cpm_pic_host; static void cpm_mask_irq(unsigned int irq) { unsigned int cpm_vec = (unsigned int)irq_map[irq].hwirq; clrbits32(&cpic_reg->cpic_cimr, (1 << cpm_vec)); } static void cpm_unmask_irq(unsigned int irq) { unsigned int cpm_vec = (unsigned int)irq_map[irq].hwirq; setbits32(&cpic_reg->cpic_cimr, (1 << cpm_vec)); } static void cpm_end_irq(unsigned int irq) { unsigned int cpm_vec = (unsigned int)irq_map[irq].hwirq; out_be32(&cpic_reg->cpic_cisr, (1 << cpm_vec)); } static struct irq_chip cpm_pic = { .typename = " CPM PIC ", .mask = cpm_mask_irq, .unmask = cpm_unmask_irq, .eoi = cpm_end_irq, }; int cpm_get_irq(void) { int cpm_vec; /* Get the vector by setting the ACK bit and then reading * the register. */ out_be16(&cpic_reg->cpic_civr, 1); cpm_vec = in_be16(&cpic_reg->cpic_civr); cpm_vec >>= 11; return irq_linear_revmap(cpm_pic_host, cpm_vec); } static int cpm_pic_host_match(struct irq_host *h, struct device_node *node) { return cpm_pic_node == node; } static int cpm_pic_host_map(struct irq_host *h, unsigned int virq, irq_hw_number_t hw) { pr_debug("cpm_pic_host_map(%d, 0x%lx)\n", virq, hw); get_irq_desc(virq)->status |= IRQ_LEVEL; set_irq_chip_and_handler(virq, &cpm_pic, handle_fasteoi_irq); return 0; } /* 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 irqreturn_t cpm_error_interrupt(int irq, void *dev) { return IRQ_HANDLED; } static struct irqaction cpm_error_irqaction = { .handler = cpm_error_interrupt, .mask = CPU_MASK_NONE, .name = "error", }; static struct irq_host_ops cpm_pic_host_ops = { .match = cpm_pic_host_match, .map = cpm_pic_host_map, }; unsigned int cpm_pic_init(void) { struct device_node *np = NULL; struct resource res; unsigned int sirq = NO_IRQ, hwirq, eirq; int ret; pr_debug("cpm_pic_init\n"); np = of_find_compatible_node(NULL, "cpm-pic", "CPM"); if (np == NULL) { printk(KERN_ERR "CPM PIC init: can not find cpm-pic node\n"); return sirq; } ret = of_address_to_resource(np, 0, &res); if (ret) goto end; cpic_reg = (void *)ioremap(res.start, res.end - res.start + 1); if (cpic_reg == NULL) goto end; sirq = irq_of_parse_and_map(np, 0); if (sirq == NO_IRQ) goto end; /* Initialize the CPM interrupt controller. */ hwirq = (unsigned int)irq_map[sirq].hwirq; out_be32(&cpic_reg->cpic_cicr, (CICR_SCD_SCC4 | CICR_SCC_SCC3 | CICR_SCB_SCC2 | CICR_SCA_SCC1) | ((hwirq/2) << 13) | CICR_HP_MASK); out_be32(&cpic_reg->cpic_cimr, 0); cpm_pic_node = of_node_get(np); cpm_pic_host = irq_alloc_host(IRQ_HOST_MAP_LINEAR, 64, &cpm_pic_host_ops, 64); if (cpm_pic_host == NULL) { printk(KERN_ERR "CPM2 PIC: failed to allocate irq host!\n"); sirq = NO_IRQ; goto end; } of_node_put(np); /* Install our own error handler. */ np = of_find_node_by_type(NULL, "cpm"); if (np == NULL) { printk(KERN_ERR "CPM PIC init: can not find cpm node\n"); goto end; } eirq= irq_of_parse_and_map(np, 0); if (eirq == NO_IRQ) goto end; if (setup_irq(eirq, &cpm_error_irqaction)) printk(KERN_ERR "Could not allocate CPM error IRQ!"); setbits32(&cpic_reg->cpic_cicr, CICR_IEN); end: of_node_put(np); return sirq; } void cpm_reset(void) { cpm8xx_t *commproc; sysconf8xx_t *siu_conf; commproc = (cpm8xx_t *)ioremap(CPM_MAP_ADDR, CPM_MAP_SIZE); #ifdef CONFIG_UCODE_PATCH /* Perform a reset. */ out_be16(&commproc->cp_cpcr, CPM_CR_RST | CPM_CR_FLG); /* Wait for it. */ while (in_be16(&commproc->cp_cpcr) & CPM_CR_FLG); cpm_load_patch(commproc); #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). */ siu_conf = (sysconf8xx_t*)immr_map(im_siu_conf); out_be32(&siu_conf->sc_sdcr, 1); immr_unmap(siu_conf); /* Reclaim the DP memory for our use. */ m8xx_cpm_dpinit(); /* Tell everyone where the comm processor resides. */ cpmp = commproc; } /* We used to do this earlier, but have to postpone as long as possible * to ensure the kernel VM is now running. */ static void alloc_host_memory(void) { dma_addr_t physaddr; /* Set the host page for allocation. */ host_buffer = (uint)dma_alloc_coherent(NULL, PAGE_SIZE, &physaddr, GFP_KERNEL); host_end = host_buffer + PAGE_SIZE; } /* 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 == 0) alloc_host_memory(); 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 (get_brgfreq()) #define BRG_UART_CLK (BRG_INT_CLK/16) #define BRG_UART_CLK_DIV16 (BRG_UART_CLK/16) void cpm_setbrg(uint brg, uint rate) { volatile uint *bp; /* This is good enough to get SMCs running..... */ bp = (uint *)&cpmp->cp_brgc1; bp += brg; /* The BRG has a 12-bit counter. For really slow baud rates (or * really fast processors), we may have to further divide by 16. */ if (((BRG_UART_CLK / rate) - 1) < 4096) *bp = (((BRG_UART_CLK / rate) - 1) << 1) | CPM_BRG_EN; else *bp = (((BRG_UART_CLK_DIV16 / rate) - 1) << 1) | CPM_BRG_EN | 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; #define CPM_DPMEM_ALIGNMENT 8 static u8* dpram_vbase; static uint dpram_pbase; void m8xx_cpm_dpinit(void) { spin_lock_init(&cpm_dpmem_lock); dpram_vbase = immr_map_size(im_cpm.cp_dpmem, CPM_DATAONLY_BASE + CPM_DATAONLY_SIZE); dpram_pbase = (uint)&((immap_t *)IMAP_ADDR)->im_cpm.cp_dpmem; /* Initialize the info header */ rh_init(&cpm_dpmem_info, CPM_DPMEM_ALIGNMENT, 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 are a subset of the available dparm. It varies * with the processor and the microcode patches applied / activated. * But the following should be at least safe. */ rh_attach_region(&cpm_dpmem_info, CPM_DATAONLY_BASE, CPM_DATAONLY_SIZE); } /* * Allocate the requested size worth of DP memory. * This function returns an offset into the DPRAM area. * Use cpm_dpram_addr() to get the virtual address of the area. */ unsigned long cpm_dpalloc(uint size, uint align) { unsigned long 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(unsigned long offset) { int ret; unsigned long flags; spin_lock_irqsave(&cpm_dpmem_lock, flags); ret = rh_free(&cpm_dpmem_info, offset); spin_unlock_irqrestore(&cpm_dpmem_lock, flags); return ret; } EXPORT_SYMBOL(cpm_dpfree); unsigned long cpm_dpalloc_fixed(unsigned long offset, uint size, uint align) { unsigned long start; unsigned long flags; spin_lock_irqsave(&cpm_dpmem_lock, flags); cpm_dpmem_info.alignment = align; start = rh_alloc_fixed(&cpm_dpmem_info, offset, size, "commproc"); spin_unlock_irqrestore(&cpm_dpmem_lock, flags); return start; } EXPORT_SYMBOL(cpm_dpalloc_fixed); void cpm_dpdump(void) { rh_dump(&cpm_dpmem_info); } EXPORT_SYMBOL(cpm_dpdump); void *cpm_dpram_addr(unsigned long offset) { return (void *)(dpram_vbase + offset); } EXPORT_SYMBOL(cpm_dpram_addr); uint cpm_dpram_phys(u8* addr) { return (dpram_pbase + (uint)(addr - dpram_vbase)); } EXPORT_SYMBOL(cpm_dpram_addr);