+++ /dev/null
-/*
- * General Purpose functions for the global management of the
- * Communication Processor Module.
- * Copyright (c) 1997 Dan Malek (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/cpm1.h>
-#include <asm/io.h>
-#include <asm/tlbflush.h>
-#include <asm/rheap.h>
-
-#define immr_map(member) \
-({ \
- u32 offset = offsetof(immap_t, member); \
- void *addr = ioremap (IMAP_ADDR + offset, \
- FIELD_SIZEOF(immap_t, member)); \
- addr; \
-})
-
-#define immr_map_size(member, size) \
-({ \
- u32 offset = offsetof(immap_t, member); \
- void *addr = ioremap (IMAP_ADDR + offset, size); \
- addr; \
-})
-
-static void m8xx_cpm_dpinit(void);
-cpm8xx_t *cpmp; /* Pointer to comm processor space */
-
-/* CPM interrupt vector functions.
-*/
-struct cpm_action {
- void (*handler)(void *);
- void *dev_id;
-};
-static struct cpm_action cpm_vecs[CPMVEC_NR];
-static irqreturn_t cpm_interrupt(int irq, void * dev);
-static irqreturn_t cpm_error_interrupt(int irq, void *dev);
-/* Define a table of names to identify CPM interrupt handlers in
- * /proc/interrupts.
- */
-const char *cpm_int_name[] =
- { "error", "PC4", "PC5", "SMC2",
- "SMC1", "SPI", "PC6", "Timer 4",
- "", "PC7", "PC8", "PC9",
- "Timer 3", "", "PC10", "PC11",
- "I2C", "RISC Timer", "Timer 2", "",
- "IDMA2", "IDMA1", "SDMA error", "PC12",
- "PC13", "Timer 1", "PC14", "SCC4",
- "SCC3", "SCC2", "SCC1", "PC15"
- };
-
-static void
-cpm_mask_irq(unsigned int irq)
-{
- int cpm_vec = irq - CPM_IRQ_OFFSET;
-
- clrbits32(&((immap_t *)IMAP_ADDR)->im_cpic.cpic_cimr, (1 << cpm_vec));
-}
-
-static void
-cpm_unmask_irq(unsigned int irq)
-{
- int cpm_vec = irq - CPM_IRQ_OFFSET;
-
- setbits32(&((immap_t *)IMAP_ADDR)->im_cpic.cpic_cimr, (1 << cpm_vec));
-}
-
-static void
-cpm_ack(unsigned int irq)
-{
- /* We do not need to do anything here. */
-}
-
-static void
-cpm_eoi(unsigned int irq)
-{
- int cpm_vec = irq - CPM_IRQ_OFFSET;
-
- out_be32(&((immap_t *)IMAP_ADDR)->im_cpic.cpic_cisr, (1 << cpm_vec));
-}
-
-struct hw_interrupt_type cpm_pic = {
- .typename = " CPM ",
- .enable = cpm_unmask_irq,
- .disable = cpm_mask_irq,
- .ack = cpm_ack,
- .end = cpm_eoi,
-};
-
-void
-m8xx_cpm_reset(void)
-{
- volatile immap_t *imp;
- volatile cpm8xx_t *commproc;
-
- imp = (immap_t *)IMAP_ADDR;
- commproc = (cpm8xx_t *)&imp->im_cpm;
-
-#ifdef CONFIG_UCODE_PATCH
- /* Perform a reset.
- */
- commproc->cp_cpcr = (CPM_CR_RST | CPM_CR_FLG);
-
- /* Wait for it.
- */
- while (commproc->cp_cpcr & CPM_CR_FLG);
-
- cpm_load_patch(imp);
-#endif
-
- /* Set SDMA Bus Request priority 5.
- * On 860T, this also enables FEC priority 6. I am not sure
- * this is what we really want for some applications, but the
- * manual recommends it.
- * Bit 25, FAM can also be set to use FEC aggressive mode (860T).
- */
- out_be32(&imp->im_siu_conf.sc_sdcr, 1),
-
- /* Reclaim the DP memory for our use. */
- m8xx_cpm_dpinit();
-
- /* Tell everyone where the comm processor resides.
- */
- cpmp = (cpm8xx_t *)commproc;
-}
-
-/* This is called during init_IRQ. We used to do it above, but this
- * was too early since init_IRQ was not yet called.
- */
-static struct irqaction cpm_error_irqaction = {
- .handler = cpm_error_interrupt,
- .mask = CPU_MASK_NONE,
-};
-static struct irqaction cpm_interrupt_irqaction = {
- .handler = cpm_interrupt,
- .mask = CPU_MASK_NONE,
- .name = "CPM cascade",
-};
-
-void
-cpm_interrupt_init(void)
-{
- int i;
-
- /* Initialize the CPM interrupt controller.
- */
- out_be32(&((immap_t *)IMAP_ADDR)->im_cpic.cpic_cicr,
- (CICR_SCD_SCC4 | CICR_SCC_SCC3 | CICR_SCB_SCC2 | CICR_SCA_SCC1) |
- ((CPM_INTERRUPT/2) << 13) | CICR_HP_MASK);
- out_be32(&((immap_t *)IMAP_ADDR)->im_cpic.cpic_cimr, 0);
-
- /* install the CPM interrupt controller routines for the CPM
- * interrupt vectors
- */
- for ( i = CPM_IRQ_OFFSET ; i < CPM_IRQ_OFFSET + NR_CPM_INTS ; i++ )
- irq_desc[i].chip = &cpm_pic;
-
- /* Set our interrupt handler with the core CPU. */
- if (setup_irq(CPM_INTERRUPT, &cpm_interrupt_irqaction))
- panic("Could not allocate CPM IRQ!");
-
- /* Install our own error handler. */
- cpm_error_irqaction.name = cpm_int_name[CPMVEC_ERROR];
- if (setup_irq(CPM_IRQ_OFFSET + CPMVEC_ERROR, &cpm_error_irqaction))
- panic("Could not allocate CPM error IRQ!");
-
- setbits32(&((immap_t *)IMAP_ADDR)->im_cpic.cpic_cicr, CICR_IEN);
-}
-
-/*
- * Get the CPM interrupt vector.
- */
-int
-cpm_get_irq(void)
-{
- int cpm_vec;
-
- /* Get the vector by setting the ACK bit and then reading
- * the register.
- */
- out_be16(&((volatile immap_t *)IMAP_ADDR)->im_cpic.cpic_civr, 1);
- cpm_vec = in_be16(&((volatile immap_t *)IMAP_ADDR)->im_cpic.cpic_civr);
- cpm_vec >>= 11;
-
- return cpm_vec;
-}
-
-/* CPM interrupt controller cascade interrupt.
-*/
-static irqreturn_t
-cpm_interrupt(int irq, void * dev)
-{
- /* This interrupt handler never actually gets called. It is
- * installed only to unmask the CPM cascade interrupt in the SIU
- * and to make the CPM cascade interrupt visible in /proc/interrupts.
- */
- return IRQ_HANDLED;
-}
-
-/* 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;
-}
-
-/* A helper function to translate the handler prototype required by
- * request_irq() to the handler prototype required by cpm_install_handler().
- */
-static irqreturn_t
-cpm_handler_helper(int irq, void *dev_id)
-{
- int cpm_vec = irq - CPM_IRQ_OFFSET;
-
- (*cpm_vecs[cpm_vec].handler)(dev_id);
-
- return IRQ_HANDLED;
-}
-
-/* Install a CPM interrupt handler.
- * This routine accepts a CPM interrupt vector in the range 0 to 31.
- * This routine is retained for backward compatibility. Rather than using
- * this routine to install a CPM interrupt handler, you can now use
- * request_irq() with an IRQ in the range CPM_IRQ_OFFSET to
- * CPM_IRQ_OFFSET + NR_CPM_INTS - 1 (16 to 47).
- *
- * Notice that the prototype of the interrupt handler function must be
- * different depending on whether you install the handler with
- * request_irq() or cpm_install_handler().
- */
-void
-cpm_install_handler(int cpm_vec, void (*handler)(void *), void *dev_id)
-{
- int err;
-
- /* If null handler, assume we are trying to free the IRQ.
- */
- if (!handler) {
- free_irq(CPM_IRQ_OFFSET + cpm_vec, dev_id);
- return;
- }
-
- if (cpm_vecs[cpm_vec].handler != 0)
- printk(KERN_INFO "CPM interrupt %x replacing %x\n",
- (uint)handler, (uint)cpm_vecs[cpm_vec].handler);
- cpm_vecs[cpm_vec].handler = handler;
- cpm_vecs[cpm_vec].dev_id = dev_id;
-
- if ((err = request_irq(CPM_IRQ_OFFSET + cpm_vec, cpm_handler_helper,
- 0, cpm_int_name[cpm_vec], dev_id)))
- printk(KERN_ERR "request_irq() returned %d for CPM vector %d\n",
- err, cpm_vec);
-}
-
-/* Free a CPM interrupt handler.
- * This routine accepts a CPM interrupt vector in the range 0 to 31.
- * This routine is retained for backward compatibility.
- */
-void
-cpm_free_handler(int cpm_vec)
-{
- request_irq(CPM_IRQ_OFFSET + cpm_vec, NULL, 0, 0,
- cpm_vecs[cpm_vec].dev_id);
-
- cpm_vecs[cpm_vec].handler = NULL;
- cpm_vecs[cpm_vec].dev_id = NULL;
-}
-
-/* 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 (((bd_t *)__res)->bi_intfreq)
-#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 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_phys);
Code Review / linux-2.6.git / blobdiff