aboutsummaryrefslogtreecommitdiff
path: root/arch/sh/cchips/hd6446x/hd64465/setup.c
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/sh/cchips/hd6446x/hd64465/setup.c
downloadlinux-stericsson-9e734775f7c22d2f89943ad6c745571f1930105f.tar.gz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'arch/sh/cchips/hd6446x/hd64465/setup.c')
-rw-r--r--arch/sh/cchips/hd6446x/hd64465/setup.c202
1 files changed, 202 insertions, 0 deletions
diff --git a/arch/sh/cchips/hd6446x/hd64465/setup.c b/arch/sh/cchips/hd6446x/hd64465/setup.c
new file mode 100644
index 000000000000..68e4c4e4283d
--- /dev/null
+++ b/arch/sh/cchips/hd6446x/hd64465/setup.c
@@ -0,0 +1,202 @@
+/*
+ * $Id: setup.c,v 1.4 2003/08/03 03:05:10 lethal Exp $
+ *
+ * Setup and IRQ handling code for the HD64465 companion chip.
+ * by Greg Banks <gbanks@pocketpenguins.com>
+ * Copyright (c) 2000 PocketPenguins Inc
+ *
+ * Derived from setup_hd64461.c which bore the message:
+ * Copyright (C) 2000 YAEGASHI Takeshi
+ */
+
+#include <linux/config.h>
+#include <linux/sched.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/param.h>
+#include <linux/ioport.h>
+#include <linux/interrupt.h>
+#include <linux/init.h>
+#include <linux/irq.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+
+#include <asm/hd64465/hd64465.h>
+
+static void disable_hd64465_irq(unsigned int irq)
+{
+ unsigned long flags;
+ unsigned short nimr;
+ unsigned short mask = 1 << (irq - HD64465_IRQ_BASE);
+
+ pr_debug("disable_hd64465_irq(%d): mask=%x\n", irq, mask);
+ local_irq_save(flags);
+ nimr = inw(HD64465_REG_NIMR);
+ nimr |= mask;
+ outw(nimr, HD64465_REG_NIMR);
+ local_irq_restore(flags);
+}
+
+
+static void enable_hd64465_irq(unsigned int irq)
+{
+ unsigned long flags;
+ unsigned short nimr;
+ unsigned short mask = 1 << (irq - HD64465_IRQ_BASE);
+
+ pr_debug("enable_hd64465_irq(%d): mask=%x\n", irq, mask);
+ local_irq_save(flags);
+ nimr = inw(HD64465_REG_NIMR);
+ nimr &= ~mask;
+ outw(nimr, HD64465_REG_NIMR);
+ local_irq_restore(flags);
+}
+
+
+static void mask_and_ack_hd64465(unsigned int irq)
+{
+ disable_hd64465_irq(irq);
+}
+
+
+static void end_hd64465_irq(unsigned int irq)
+{
+ if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
+ enable_hd64465_irq(irq);
+}
+
+
+static unsigned int startup_hd64465_irq(unsigned int irq)
+{
+ enable_hd64465_irq(irq);
+ return 0;
+}
+
+
+static void shutdown_hd64465_irq(unsigned int irq)
+{
+ disable_hd64465_irq(irq);
+}
+
+
+static struct hw_interrupt_type hd64465_irq_type = {
+ .typename = "HD64465-IRQ",
+ .startup = startup_hd64465_irq,
+ .shutdown = shutdown_hd64465_irq,
+ .enable = enable_hd64465_irq,
+ .disable = disable_hd64465_irq,
+ .ack = mask_and_ack_hd64465,
+ .end = end_hd64465_irq,
+};
+
+
+static irqreturn_t hd64465_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+ printk(KERN_INFO
+ "HD64465: spurious interrupt, nirr: 0x%x nimr: 0x%x\n",
+ inw(HD64465_REG_NIRR), inw(HD64465_REG_NIMR));
+
+ return IRQ_NONE;
+}
+
+
+/*====================================================*/
+
+/*
+ * Support for a secondary IRQ demux step. This is necessary
+ * because the HD64465 presents a very thin interface to the
+ * PCMCIA bus; a lot of features (such as remapping interrupts)
+ * normally done in hardware by other PCMCIA host bridges is
+ * instead done in software.
+ */
+static struct
+{
+ int (*func)(int, void *);
+ void *dev;
+} hd64465_demux[HD64465_IRQ_NUM];
+
+void hd64465_register_irq_demux(int irq,
+ int (*demux)(int irq, void *dev), void *dev)
+{
+ hd64465_demux[irq - HD64465_IRQ_BASE].func = demux;
+ hd64465_demux[irq - HD64465_IRQ_BASE].dev = dev;
+}
+EXPORT_SYMBOL(hd64465_register_irq_demux);
+
+void hd64465_unregister_irq_demux(int irq)
+{
+ hd64465_demux[irq - HD64465_IRQ_BASE].func = 0;
+}
+EXPORT_SYMBOL(hd64465_unregister_irq_demux);
+
+
+
+int hd64465_irq_demux(int irq)
+{
+ if (irq == CONFIG_HD64465_IRQ) {
+ unsigned short i, bit;
+ unsigned short nirr = inw(HD64465_REG_NIRR);
+ unsigned short nimr = inw(HD64465_REG_NIMR);
+
+ pr_debug("hd64465_irq_demux, nirr=%04x, nimr=%04x\n", nirr, nimr);
+ nirr &= ~nimr;
+ for (bit = 1, i = 0 ; i < HD64465_IRQ_NUM ; bit <<= 1, i++)
+ if (nirr & bit)
+ break;
+
+ if (i < HD64465_IRQ_NUM) {
+ irq = HD64465_IRQ_BASE + i;
+ if (hd64465_demux[i].func != 0)
+ irq = hd64465_demux[i].func(irq, hd64465_demux[i].dev);
+ }
+ }
+ return irq;
+}
+
+static struct irqaction irq0 = { hd64465_interrupt, SA_INTERRUPT, CPU_MASK_NONE, "HD64465", NULL, NULL};
+
+
+static int __init setup_hd64465(void)
+{
+ int i;
+ unsigned short rev;
+ unsigned short smscr;
+
+ if (!MACH_HD64465)
+ return 0;
+
+ printk(KERN_INFO "HD64465 configured at 0x%x on irq %d(mapped into %d to %d)\n",
+ CONFIG_HD64465_IOBASE,
+ CONFIG_HD64465_IRQ,
+ HD64465_IRQ_BASE,
+ HD64465_IRQ_BASE+HD64465_IRQ_NUM-1);
+
+ if (inw(HD64465_REG_SDID) != HD64465_SDID) {
+ printk(KERN_ERR "HD64465 device ID not found, check base address\n");
+ }
+
+ rev = inw(HD64465_REG_SRR);
+ printk(KERN_INFO "HD64465 hardware revision %d.%d\n", (rev >> 8) & 0xff, rev & 0xff);
+
+ outw(0xffff, HD64465_REG_NIMR); /* mask all interrupts */
+
+ for (i = 0; i < HD64465_IRQ_NUM ; i++) {
+ irq_desc[HD64465_IRQ_BASE + i].handler = &hd64465_irq_type;
+ }
+
+ setup_irq(CONFIG_HD64465_IRQ, &irq0);
+
+#ifdef CONFIG_SERIAL
+ /* wake up the UART from STANDBY at this point */
+ smscr = inw(HD64465_REG_SMSCR);
+ outw(smscr & (~HD64465_SMSCR_UARTST), HD64465_REG_SMSCR);
+
+ /* remap IO ports for first ISA serial port to HD64465 UART */
+ hd64465_port_map(0x3f8, 8, CONFIG_HD64465_IOBASE + 0x8000, 1);
+#endif
+
+ return 0;
+}
+
+module_init(setup_hd64465);