1 files changed, 105 insertions, 0 deletions
diff --git a/arch/ppc/kernel/pmac_nvram.c b/arch/ppc/kernel/pmac_nvram.c
new file mode 100644
index 000000000..99bfa4f8b
--- /dev/null
+++ b/arch/ppc/kernel/pmac_nvram.c
@@ -0,0 +1,105 @@
+/*
+ * Miscellaneous procedures for dealing with the PowerMac hardware.
+ */
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/stddef.h>
+#include <linux/nvram.h>
+#include <linux/init.h>
+#include <asm/init.h>
+#include <asm/io.h>
+#include <asm/system.h>
+#include <asm/prom.h>
+#include <linux/adb.h>
+#include <linux/pmu.h>
+
+/*
+ * Read and write the non-volatile RAM on PowerMacs and CHRP machines.
+ */
+static int nvram_naddrs;
+static volatile unsigned char *nvram_addr;
+static volatile unsigned char *nvram_data;
+static int nvram_mult;
+
+#define NVRAM_SIZE	0x2000	/* 8kB of non-volatile RAM */
+
+__init
+void pmac_nvram_init(void)
+{
+	struct device_node *dp;
+
+	dp = find_devices("nvram");
+	if (dp == NULL) {
+		printk(KERN_ERR "Can't find NVRAM device\n");
+		nvram_naddrs = 0;
+		return;
+	}
+	nvram_naddrs = dp->n_addrs;
+	if (_machine == _MACH_chrp && nvram_naddrs == 1) {
+		nvram_data = ioremap(dp->addrs[0].address, dp->addrs[0].size);
+		nvram_mult = 1;
+	} else if (nvram_naddrs == 1) {
+		nvram_data = ioremap(dp->addrs[0].address, dp->addrs[0].size);
+		nvram_mult = (dp->addrs[0].size + NVRAM_SIZE - 1) / NVRAM_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 if (nvram_naddrs == 0 && sys_ctrler == SYS_CTRLER_PMU) {
+		nvram_naddrs = -1;
+	} else {
+		printk(KERN_ERR "Don't know how to access NVRAM with %d addresses\n",
+		       nvram_naddrs);
+	}
+}
+
+__openfirmware
+unsigned char nvram_read_byte(int addr)
+{
+	struct adb_request req;
+
+	switch (nvram_naddrs) {
+#ifdef CONFIG_ADB_PMU
+	case -1:
+		if (pmu_request(&req, NULL, 3, PMU_READ_NVRAM,
+				(addr >> 8) & 0xff, addr & 0xff))
+			break;
+		while (!req.complete)
+			pmu_poll();
+		return req.reply[1];
+#endif
+	case 1:
+		return nvram_data[(addr & (NVRAM_SIZE - 1)) * nvram_mult];
+	case 2:
+		*nvram_addr = addr >> 5;
+		eieio();
+		return nvram_data[(addr & 0x1f) << 4];
+	}
+	return 0;
+}
+
+__openfirmware
+void nvram_write_byte(unsigned char val, int addr)
+{
+	struct adb_request req;
+
+	switch (nvram_naddrs) {
+#ifdef CONFIG_ADB_PMU
+	case -1:
+		if (pmu_request(&req, NULL, 4, PMU_WRITE_NVRAM,
+				(addr >> 8) & 0xff, addr & 0xff, val))
+			break;
+		while (!req.complete)
+			pmu_poll();
+		break;
+#endif
+	case 1:
+		nvram_data[(addr & (NVRAM_SIZE - 1)) * nvram_mult] = val;
+		break;
+	case 2:
+		*nvram_addr = addr >> 5;
+		eieio();
+		nvram_data[(addr & 0x1f) << 4] = val;
+		break;
+	}
+	eieio();
+}