patch-2.1.48 linux/arch/ppc/kernel/pmac_support.c

• Lines: 83
• Date: Thu Jul 31 13:09:17 1997
• Orig file: v2.1.47/linux/arch/ppc/kernel/pmac_support.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.47/linux/arch/ppc/kernel/pmac_support.c linux/arch/ppc/kernel/pmac_support.c
@@ -0,0 +1,82 @@
+/*
+ * Miscellaneous procedures for dealing with the PowerMac hardware.
+ */
+#include <linux/kernel.h>
+#include <linux/stddef.h>
+#include <asm/ptrace.h>
+#include <asm/io.h>
+#include <asm/cuda.h>
+#include <asm/system.h>
+#include <asm/prom.h>
+
+void hard_reset_now(void)
+{
+	struct cuda_request req;
+
+	cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_RESET_SYSTEM);
+	for (;;)
+		cuda_poll();
+}
+
+void poweroff_now(void)
+{
+	struct cuda_request req;
+
+	cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_POWERDOWN);
+	for (;;)
+		cuda_poll();
+}
+
+/*
+ * Read and write the non-volatile RAM on PowerMacs.
+ */
+static int nvram_naddrs;
+static volatile unsigned char *nvram_addr;
+static volatile unsigned char *nvram_data;
+
+void nvram_init(void)
+{
+	struct device_node *dp;
+
+	dp = find_devices("nvram");
+	if (dp == NULL)
+		panic("Can't find NVRAM device");
+	nvram_naddrs = dp->n_addrs;
+	if (nvram_naddrs == 1)
+		nvram_data = ioremap(dp->addrs[0].address, dp->addrs[0].size);
+	else if (nvram_naddrs == 2) {
+		nvram_addr = ioremap(dp->addrs[0].address, dp->addrs[0].size);
+		nvram_data = ioremap(dp->addrs[1].address, dp->addrs[1].size);
+	} else {
+		printk("Found %d addresses for NVRAM\n", nvram_naddrs);
+		panic("don't understand NVRAM");
+	}
+}
+
+int nvram_readb(int addr)
+{
+	switch (nvram_naddrs) {
+	case 1:
+		return nvram_data[(addr & 0x1fff) << 4];
+	case 2:
+		*nvram_addr = addr >> 5;
+		eieio();
+		return nvram_data[(addr & 0x1f) << 4];
+	}
+	return -1;
+}
+
+void nvram_writeb(int addr, int val)
+{
+	switch (nvram_naddrs) {
+	case 1:
+		nvram_data[(addr & 0x1fff) << 4] = val;
+		break;
+	case 2:
+		*nvram_addr = addr >> 5;
+		eieio();
+		nvram_data[(addr & 0x1f) << 4] = val;
+		break;
+	}
+	eieio();
+}