1 files changed, 309 insertions, 0 deletions

diff --git a/arch/m68k/68360/commproc.c b/arch/m68k/68360/commproc.c
new file mode 100644
index 000000000000..315727b7ff40
--- /dev/null
+++ b/arch/m68k/68360/commproc.c
@@ -0,0 +1,309 @@
+/*
+ * General Purpose functions for the global management of the
+ * Communication Processor Module.
+ *
+ * Copyright (c) 2000 Michael Leslie <mleslie@lineo.com>
+ * 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.
+ *
+ */
+
+/*
+ * Michael Leslie <mleslie@lineo.com>
+ * adapted Dan Malek's ppc8xx drivers to M68360
+ *
+ */
+
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/param.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <asm/irq.h>
+#include <asm/m68360.h>
+#include <asm/commproc.h>
+
+/* #include <asm/page.h> */
+/* #include <asm/pgtable.h> */
+extern void *_quicc_base;
+extern unsigned int system_clock;
+
+
+static uint dp_alloc_base;      /* Starting offset in DP ram */
+static uint dp_alloc_top;       /* Max offset + 1 */
+
+#if 0
+static  void    *host_buffer;   /* One page of host buffer */
+static  void    *host_end;          /* end + 1 */
+#endif
+
+/* struct  cpm360_t *cpmp; */         /* Pointer to comm processor space */
+
+QUICC  *pquicc;
+/* QUICC  *quicc_dpram; */ /* mleslie - temporary; use extern pquicc elsewhere instead */
+
+
+/* CPM interrupt vector functions. */
+struct  cpm_action {
+        void    (*handler)(void *);
+        void    *dev_id;
+};
+static  struct  cpm_action cpm_vecs[CPMVEC_NR];
+static  void    cpm_interrupt(int irq, void * dev, struct pt_regs * regs);
+static  void    cpm_error_interrupt(void *);
+
+/* prototypes: */
+void cpm_install_handler(int vec, void (*handler)(), void *dev_id);
+void m360_cpm_reset(void);
+
+
+
+
+void __init m360_cpm_reset()
+{
+/*      pte_t              *pte; */
+
+        pquicc = (struct quicc *)(_quicc_base); /* initialized in crt0_rXm.S */
+
+        /* Perform a CPM reset. */
+        pquicc->cp_cr = (SOFTWARE_RESET | CMD_FLAG);
+
+        /* Wait for CPM to become ready (should be 2 clocks). */
+        while (pquicc->cp_cr & CMD_FLAG);
+
+        /* On the recommendation of the 68360 manual, p. 7-60
+         * - Set sdma interrupt service mask to 7
+         * - Set sdma arbitration ID to 4
+         */
+        pquicc->sdma_sdcr = 0x0740;
+
+
+        /* Claim the DP memory for our use.
+         */
+        dp_alloc_base = CPM_DATAONLY_BASE;
+        dp_alloc_top = dp_alloc_base + CPM_DATAONLY_SIZE;
+
+
+        /* Set the host page for allocation.
+         */
+        /*      host_buffer = host_page_addr; */
+        /*      host_end = host_page_addr + PAGE_SIZE; */
+
+        /*      pte = find_pte(&init_mm, host_page_addr); */
+        /*      pte_val(*pte) |= _PAGE_NO_CACHE; */
+        /*      flush_tlb_page(current->mm->mmap, host_buffer); */
+
+        /* Tell everyone where the comm processor resides.
+        */
+/*      cpmp = (cpm360_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.
+ */
+void
+cpm_interrupt_init(void)
+{
+        /* Initialize the CPM interrupt controller.
+         * NOTE THAT pquicc had better have been initialized!
+         * reference: MC68360UM p. 7-377
+         */
+        pquicc->intr_cicr =
+                (CICR_SCD_SCC4 | CICR_SCC_SCC3 | CICR_SCB_SCC2 | CICR_SCA_SCC1) |
+                (CPM_INTERRUPT << 13) |
+                CICR_HP_MASK |
+                (CPM_VECTOR_BASE << 5) |
+                CICR_SPS;
+
+        /* mask all CPM interrupts from reaching the cpu32 core: */
+        pquicc->intr_cimr = 0;
+
+
+        /* mles - If I understand correctly, the 360 just pops over to the CPM
+         * specific vector, obviating the necessity to vector through the IRQ
+         * whose priority the CPM is set to. This needs a closer look, though.
+         */
+
+        /* Set our interrupt handler with the core CPU. */
+/*      if (request_irq(CPM_INTERRUPT, cpm_interrupt, 0, "cpm", NULL) != 0) */
+/*              panic("Could not allocate CPM IRQ!"); */
+
+        /* Install our own error handler.
+         */
+        /* I think we want to hold off on this one for the moment - mles */
+        /* cpm_install_handler(CPMVEC_ERROR, cpm_error_interrupt, NULL); */
+
+        /* master CPM interrupt enable */
+        /* pquicc->intr_cicr |= CICR_IEN; */ /* no such animal for 360 */
+}
+
+
+
+/* CPM interrupt controller interrupt.
+*/
+static  void
+cpm_interrupt(int irq, void * dev, struct pt_regs * regs)
+{
+        /* uint vec; */
+
+        /* mles: Note that this stuff is currently being performed by
+         * M68360_do_irq(int vec, struct pt_regs *fp), in ../ints.c  */
+
+        /* figure out the vector */
+        /* call that vector's handler */
+        /* clear the irq's bit in the service register */
+
+#if 0 /* old 860 stuff: */
+        /* Get the vector by setting the ACK bit and then reading
+         * the register.
+         */
+        ((volatile immap_t *)IMAP_ADDR)->im_cpic.cpic_civr = 1;
+        vec = ((volatile immap_t *)IMAP_ADDR)->im_cpic.cpic_civr;
+        vec >>= 11;
+
+
+        if (cpm_vecs[vec].handler != 0)
+                (*cpm_vecs[vec].handler)(cpm_vecs[vec].dev_id);
+        else
+                ((immap_t *)IMAP_ADDR)->im_cpic.cpic_cimr &= ~(1 << vec);
+
+        /* After servicing the interrupt, we have to remove the status
+         * indicator.
+         */
+        ((immap_t *)IMAP_ADDR)->im_cpic.cpic_cisr |= (1 << vec);
+#endif
+
+}
+
+/* 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  void
+cpm_error_interrupt(void *dev)
+{
+}
+
+/* Install a CPM interrupt handler.
+*/
+void
+cpm_install_handler(int vec, void (*handler)(), void *dev_id)
+{
+
+        request_irq(vec, handler, 0, "timer", dev_id);
+
+/*      if (cpm_vecs[vec].handler != 0) */
+/*              printk(KERN_INFO "CPM interrupt %x replacing %x\n", */
+/*                      (uint)handler, (uint)cpm_vecs[vec].handler); */
+/*      cpm_vecs[vec].handler = handler; */
+/*      cpm_vecs[vec].dev_id = dev_id; */
+
+        /*              ((immap_t *)IMAP_ADDR)->im_cpic.cpic_cimr |= (1 << vec); */
+/*      pquicc->intr_cimr |= (1 << vec); */
+
+}
+
+/* Free a CPM interrupt handler.
+*/
+void
+cpm_free_handler(int vec)
+{
+        cpm_vecs[vec].handler = NULL;
+        cpm_vecs[vec].dev_id = NULL;
+        /* ((immap_t *)IMAP_ADDR)->im_cpic.cpic_cimr &= ~(1 << vec); */
+        pquicc->intr_cimr &= ~(1 << vec);
+}
+
+
+
+
+/* Allocate some memory from the dual ported ram.  We may want to
+ * enforce alignment restrictions, but right now everyone is a good
+ * citizen.
+ */
+uint
+m360_cpm_dpalloc(uint size)
+{
+        uint    retloc;
+
+        if ((dp_alloc_base + size) >= dp_alloc_top)
+                return(CPM_DP_NOSPACE);
+
+        retloc = dp_alloc_base;
+        dp_alloc_base += size;
+
+        return(retloc);
+}
+
+
+#if 0 /* mleslie - for now these are simply kmalloc'd */
+/* We also own one page of host buffer space for the allocation of
+ * UART "fifos" and the like.
+ */
+uint
+m360_cpm_hostalloc(uint size)
+{
+        uint    retloc;
+
+        if ((host_buffer + size) >= host_end)
+                return(0);
+
+        retloc = host_buffer;
+        host_buffer += size;
+
+        return(retloc);
+}
+#endif
+
+
+/* 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 * 1000000) */
+#define BRG_INT_CLK             system_clock
+#define BRG_UART_CLK    (BRG_INT_CLK/16)
+
+void
+m360_cpm_setbrg(uint brg, uint rate)
+{
+        volatile uint   *bp;
+
+        /* This is good enough to get SMCs running.....
+         */
+        /* bp = (uint *)&cpmp->cp_brgc1; */
+        bp = (volatile uint *)(&pquicc->brgc[0].l);
+        bp += brg;
+        *bp = ((BRG_UART_CLK / rate - 1) << 1) | CPM_BRG_EN;
+}
+
+
+/*
+ * Local variables:
+ *  c-indent-level: 4
+ *  c-basic-offset: 4
+ *  tab-width: 4
+ * End:
+ */