diff options
Diffstat (limited to 'arch/powerpc/sysdev/commproc.c')
-rw-r--r-- | arch/powerpc/sysdev/commproc.c | 398 |
1 files changed, 398 insertions, 0 deletions
diff --git a/arch/powerpc/sysdev/commproc.c b/arch/powerpc/sysdev/commproc.c new file mode 100644 index 00000000000..9b4fafd9a84 --- /dev/null +++ b/arch/powerpc/sysdev/commproc.c @@ -0,0 +1,398 @@ +/* + * 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, (void *)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. + */ +uint cpm_dpalloc(uint size, uint align) +{ + void *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(uint offset) +{ + int ret; + unsigned long flags; + + spin_lock_irqsave(&cpm_dpmem_lock, flags); + ret = rh_free(&cpm_dpmem_info, (void *)offset); + spin_unlock_irqrestore(&cpm_dpmem_lock, flags); + + return ret; +} +EXPORT_SYMBOL(cpm_dpfree); + +uint cpm_dpalloc_fixed(uint offset, uint size, uint align) +{ + void *start; + unsigned long flags; + + spin_lock_irqsave(&cpm_dpmem_lock, flags); + cpm_dpmem_info.alignment = align; + start = rh_alloc_fixed(&cpm_dpmem_info, (void *)offset, size, "commproc"); + spin_unlock_irqrestore(&cpm_dpmem_lock, flags); + + return (uint)start; +} +EXPORT_SYMBOL(cpm_dpalloc_fixed); + +void cpm_dpdump(void) +{ + rh_dump(&cpm_dpmem_info); +} +EXPORT_SYMBOL(cpm_dpdump); + +void *cpm_dpram_addr(uint 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); |