#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/irq.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>
extern int get_pteptr(struct mm_struct *mm, unsigned long addr, pte_t **ptep);
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 *, struct pt_regs * regs);
+static irqreturn_t cpm_interrupt(int irq, void * dev, struct pt_regs * regs);
+static irqreturn_t cpm_error_interrupt(int irq, void *dev, struct pt_regs * regs);
static void alloc_host_memory(void);
+/* 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"
+ };
-#if 1
-void
-m8xx_cpm_reset(void)
+static void
+cpm_mask_irq(unsigned int irq)
{
- 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);
+ int cpm_vec = irq - CPM_IRQ_OFFSET;
- /* Wait for it.
- */
- while (commproc->cp_cpcr & CPM_CR_FLG);
-
- cpm_load_patch(imp);
-#endif
+ ((immap_t *)IMAP_ADDR)->im_cpic.cpic_cimr &= ~(1 << cpm_vec);
+}
- /* 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).
- */
- imp->im_siu_conf.sc_sdcr = 1;
+static void
+cpm_unmask_irq(unsigned int irq)
+{
+ int cpm_vec = irq - CPM_IRQ_OFFSET;
- /* Reclaim the DP memory for our use. */
- m8xx_cpm_dpinit();
+ ((immap_t *)IMAP_ADDR)->im_cpic.cpic_cimr |= (1 << cpm_vec);
+}
- /* Tell everyone where the comm processor resides.
- */
- cpmp = (cpm8xx_t *)commproc;
+static void
+cpm_ack(unsigned int irq)
+{
+ /* We do not need to do anything here. */
}
-/* 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()
+cpm_eoi(unsigned int irq)
{
- uint physaddr;
+ int cpm_vec = irq - CPM_IRQ_OFFSET;
- /* Set the host page for allocation.
- */
- host_buffer = (uint)consistent_alloc(GFP_KERNEL, PAGE_SIZE, &physaddr);
- host_end = host_buffer + PAGE_SIZE;
+ ((immap_t *)IMAP_ADDR)->im_cpic.cpic_cisr = (1 << cpm_vec);
}
-#else
+
+struct hw_interrupt_type cpm_pic = {
+ .typename = " CPM ",
+ .enable = cpm_unmask_irq,
+ .disable = cpm_mask_irq,
+ .ack = cpm_ack,
+ .end = cpm_eoi,
+};
+
+extern void flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr);
+
void
-m8xx_cpm_reset(uint host_page_addr)
+m8xx_cpm_reset(uint bootpage)
{
volatile immap_t *imp;
volatile cpm8xx_t *commproc;
- pte_t *pte;
+ pte_t *pte;
imp = (immap_t *)IMAP_ADDR;
commproc = (cpm8xx_t *)&imp->im_cpm;
* 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).
- */
+ */
imp->im_siu_conf.sc_sdcr = 1;
/* Reclaim the DP memory for our use. */
m8xx_cpm_dpinit();
- /* Set the host page for allocation.
- */
- host_buffer = host_page_addr; /* Host virtual page address */
- host_end = host_page_addr + PAGE_SIZE;
+ /* get the PTE for the bootpage */
+ if (!get_pteptr(&init_mm, bootpage, &pte))
+ panic("get_pteptr failed\n");
+
+ /* and make it uncachable */
+ pte_val(*pte) |= _PAGE_NO_CACHE;
+ _tlbie(bootpage);
- /* We need to get this page early, so I have to do it the
- * hard way.
- */
- if (get_pteptr(&init_mm, host_page_addr, &pte)) {
- pte_val(*pte) |= _PAGE_NO_CACHE;
- flush_tlb_page(init_mm.mmap, host_buffer);
- }
- else {
- panic("Huh? No CPM host page?");
- }
+ host_buffer = bootpage;
+ host_end = host_buffer + PAGE_SIZE;
/* Tell everyone where the comm processor resides.
*/
cpmp = (cpm8xx_t *)commproc;
}
-#endif
+
+/* 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;
+}
/* 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.
*/
((immap_t *)IMAP_ADDR)->im_cpic.cpic_cicr =
((CPM_INTERRUPT/2) << 13) | CICR_HP_MASK;
((immap_t *)IMAP_ADDR)->im_cpic.cpic_cimr = 0;
- /* Set our interrupt handler with the core CPU.
- */
- if (request_8xxirq(CPM_INTERRUPT, cpm_interrupt, 0, "cpm", NULL) != 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].handler = &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_install_handler(CPMVEC_ERROR, cpm_error_interrupt, NULL);
+ /* 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!");
+
((immap_t *)IMAP_ADDR)->im_cpic.cpic_cicr |= CICR_IEN;
}
-/* CPM interrupt controller interrupt.
-*/
-static void
-cpm_interrupt(int irq, void * dev, struct pt_regs * regs)
+/*
+ * Get the CPM interrupt vector.
+ */
+int
+cpm_get_irq(struct pt_regs *regs)
{
- uint vec;
+ int cpm_vec;
/* 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;
+ cpm_vec = ((volatile immap_t *)IMAP_ADDR)->im_cpic.cpic_civr;
+ cpm_vec >>= 11;
- if (cpm_vecs[vec].handler != 0)
- (*cpm_vecs[vec].handler)(cpm_vecs[vec].dev_id, regs);
- else
- ((immap_t *)IMAP_ADDR)->im_cpic.cpic_cimr &= ~(1 << vec);
+ return cpm_vec;
+}
- /* After servicing the interrupt, we have to remove the status
- * indicator.
+/* CPM interrupt controller cascade interrupt.
+*/
+static irqreturn_t
+cpm_interrupt(int irq, void * dev, struct pt_regs * regs)
+{
+ /* 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.
*/
- ((immap_t *)IMAP_ADDR)->im_cpic.cpic_cisr = (1 << vec);
-
+ return IRQ_HANDLED;
}
/* The CPM can generate the error interrupt when there is a race condition
* 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, struct pt_regs *regs)
+static irqreturn_t
+cpm_error_interrupt(int irq, void *dev, struct pt_regs *regs)
+{
+ 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, struct pt_regs *regs)
{
+ int cpm_vec = irq - CPM_IRQ_OFFSET;
+
+ (*cpm_vecs[cpm_vec].handler)(dev_id, regs);
+
+ 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 vec, void (*handler)(void *, struct pt_regs *regs),
+cpm_install_handler(int cpm_vec, void (*handler)(void *, struct pt_regs *regs),
void *dev_id)
{
+ int err;
/* If null handler, assume we are trying to free the IRQ.
*/
if (!handler) {
- cpm_free_handler(vec);
+ free_irq(CPM_IRQ_OFFSET + cpm_vec, dev_id);
return;
}
- if (cpm_vecs[vec].handler != 0)
- printk("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);
+ 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 vec)
+cpm_free_handler(int cpm_vec)
{
- cpm_vecs[vec].handler = NULL;
- cpm_vecs[vec].dev_id = NULL;
- ((immap_t *)IMAP_ADDR)->im_cpic.cpic_cimr &= ~(1 << 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;
}
/* We also own one page of host buffer space for the allocation of
{
uint retloc;
-#if 1
if (host_buffer == 0)
alloc_host_memory();
-#endif
if ((host_buffer + size) >= host_end)
return(0);
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