--- /dev/null
+/*
+ * 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 {
+ irq_handler_t handler;
+ 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, irq_handler_t 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, irq_handler_t 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:
+ */
projects / firefly-linux-kernel-4.4.55.git / blobdiff