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Diffstat (limited to 'arch/ppc/boot/simple/mpc10x_memory.c')
-rw-r--r--arch/ppc/boot/simple/mpc10x_memory.c111
1 files changed, 111 insertions, 0 deletions
diff --git a/arch/ppc/boot/simple/mpc10x_memory.c b/arch/ppc/boot/simple/mpc10x_memory.c
new file mode 100644
index 00000000000..977daedc14c
--- /dev/null
+++ b/arch/ppc/boot/simple/mpc10x_memory.c
@@ -0,0 +1,111 @@
+/*
+ * arch/ppc/boot/common/mpc10x_common.c
+ *
+ * A routine to find out how much memory the machine has.
+ *
+ * Based on:
+ * arch/ppc/kernel/mpc10x_common.c
+ *
+ * Author: Mark A. Greer
+ * mgreer@mvista.com
+ *
+ * 2001-2002 (c) MontaVista, Software, Inc. This file is licensed under
+ * the terms of the GNU General Public License version 2. This program
+ * is licensed "as is" without any warranty of any kind, whether express
+ * or implied.
+ */
+
+#include <linux/pci.h>
+#include <asm/types.h>
+#include <asm/io.h>
+#include "mpc10x.h"
+
+/*
+ * *** WARNING - A BAT MUST be set to access the PCI config addr/data regs ***
+ */
+
+/*
+ * PCI config space macros, similar to indirect_xxx and early_xxx macros.
+ * We assume bus 0.
+ */
+#define MPC10X_CFG_read(val, addr, type, op) *val = op((type)(addr))
+#define MPC10X_CFG_write(val, addr, type, op) op((type *)(addr), (val))
+
+#define MPC10X_PCI_OP(rw, size, type, op, mask) \
+static void \
+mpc10x_##rw##_config_##size(unsigned int *cfg_addr, \
+ unsigned int *cfg_data, int devfn, int offset, \
+ type val) \
+{ \
+ out_be32(cfg_addr, \
+ ((offset & 0xfc) << 24) | (devfn << 16) \
+ | (0 << 8) | 0x80); \
+ MPC10X_CFG_##rw(val, cfg_data + (offset & mask), type, op); \
+ return; \
+}
+
+MPC10X_PCI_OP(read, byte, u8 *, in_8, 3)
+MPC10X_PCI_OP(read, dword, u32 *, in_le32, 0)
+
+/*
+ * Read the memory controller registers to determine the amount of memory in
+ * the system. This assumes that the firmware has correctly set up the memory
+ * controller registers. On CONFIG_PPC_PREP, we know we are being called
+ * under a PReP memory map. On all other machines, we assume we are under
+ * a CHRP memory map. Further, on CONFIG_PPC_MULTIPLATFORM we must rename
+ * this function.
+ */
+#ifdef CONFIG_PPC_MULTIPLATFORM
+#define get_mem_size mpc10x_get_mem_size
+#endif
+unsigned long
+get_mem_size(void)
+{
+ unsigned int *config_addr, *config_data, val;
+ unsigned long start, end, total, offset;
+ int i;
+ unsigned char bank_enables;
+
+#ifdef CONFIG_PPC_PREP
+ config_addr = (unsigned int *)MPC10X_MAPA_CNFG_ADDR;
+ config_data = (unsigned int *)MPC10X_MAPA_CNFG_DATA;
+#else
+ config_addr = (unsigned int *)MPC10X_MAPB_CNFG_ADDR;
+ config_data = (unsigned int *)MPC10X_MAPB_CNFG_DATA;
+#endif
+
+ mpc10x_read_config_byte(config_addr, config_data, PCI_DEVFN(0,0),
+ MPC10X_MCTLR_MEM_BANK_ENABLES, &bank_enables);
+
+ total = 0;
+
+ for (i = 0; i < 8; i++) {
+ if (bank_enables & (1 << i)) {
+ offset = MPC10X_MCTLR_MEM_START_1 + ((i > 3) ? 4 : 0);
+ mpc10x_read_config_dword(config_addr, config_data,
+ PCI_DEVFN(0,0), offset, &val);
+ start = (val >> ((i & 3) << 3)) & 0xff;
+
+ offset = MPC10X_MCTLR_EXT_MEM_START_1 + ((i>3) ? 4 : 0);
+ mpc10x_read_config_dword(config_addr, config_data,
+ PCI_DEVFN(0,0), offset, &val);
+ val = (val >> ((i & 3) << 3)) & 0x03;
+ start = (val << 28) | (start << 20);
+
+ offset = MPC10X_MCTLR_MEM_END_1 + ((i > 3) ? 4 : 0);
+ mpc10x_read_config_dword(config_addr, config_data,
+ PCI_DEVFN(0,0), offset, &val);
+ end = (val >> ((i & 3) << 3)) & 0xff;
+
+ offset = MPC10X_MCTLR_EXT_MEM_END_1 + ((i > 3) ? 4 : 0);
+ mpc10x_read_config_dword(config_addr, config_data,
+ PCI_DEVFN(0,0), offset, &val);
+ val = (val >> ((i & 3) << 3)) & 0x03;
+ end = (val << 28) | (end << 20) | 0xfffff;
+
+ total += (end - start + 1);
+ }
+ }
+
+ return total;
+}