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-rw-r--r--arch/sparc64/kernel/chmc.c458
1 files changed, 458 insertions, 0 deletions
diff --git a/arch/sparc64/kernel/chmc.c b/arch/sparc64/kernel/chmc.c
new file mode 100644
index 000000000000..97cf912f0853
--- /dev/null
+++ b/arch/sparc64/kernel/chmc.c
@@ -0,0 +1,458 @@
+/* $Id: chmc.c,v 1.4 2002/01/08 16:00:14 davem Exp $
+ * memctrlr.c: Driver for UltraSPARC-III memory controller.
+ *
+ * Copyright (C) 2001 David S. Miller (davem@redhat.com)
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/list.h>
+#include <linux/string.h>
+#include <linux/sched.h>
+#include <linux/smp.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <asm/spitfire.h>
+#include <asm/chmctrl.h>
+#include <asm/oplib.h>
+#include <asm/io.h>
+
+#define CHMCTRL_NDGRPS 2
+#define CHMCTRL_NDIMMS 4
+
+#define DIMMS_PER_MC (CHMCTRL_NDGRPS * CHMCTRL_NDIMMS)
+
+/* OBP memory-layout property format. */
+struct obp_map {
+ unsigned char dimm_map[144];
+ unsigned char pin_map[576];
+};
+
+#define DIMM_LABEL_SZ 8
+
+struct obp_mem_layout {
+ /* One max 8-byte string label per DIMM. Usually
+ * this matches the label on the motherboard where
+ * that DIMM resides.
+ */
+ char dimm_labels[DIMMS_PER_MC][DIMM_LABEL_SZ];
+
+ /* If symmetric use map[0], else it is
+ * asymmetric and map[1] should be used.
+ */
+ char symmetric;
+
+ struct obp_map map[2];
+};
+
+#define CHMCTRL_NBANKS 4
+
+struct bank_info {
+ struct mctrl_info *mp;
+ int bank_id;
+
+ u64 raw_reg;
+ int valid;
+ int uk;
+ int um;
+ int lk;
+ int lm;
+ int interleave;
+ unsigned long base;
+ unsigned long size;
+};
+
+struct mctrl_info {
+ struct list_head list;
+ int portid;
+ int index;
+
+ struct obp_mem_layout layout_prop;
+ int layout_size;
+
+ void __iomem *regs;
+
+ u64 timing_control1;
+ u64 timing_control2;
+ u64 timing_control3;
+ u64 timing_control4;
+ u64 memaddr_control;
+
+ struct bank_info logical_banks[CHMCTRL_NBANKS];
+};
+
+static LIST_HEAD(mctrl_list);
+
+/* Does BANK decode PHYS_ADDR? */
+static int bank_match(struct bank_info *bp, unsigned long phys_addr)
+{
+ unsigned long upper_bits = (phys_addr & PA_UPPER_BITS) >> PA_UPPER_BITS_SHIFT;
+ unsigned long lower_bits = (phys_addr & PA_LOWER_BITS) >> PA_LOWER_BITS_SHIFT;
+
+ /* Bank must be enabled to match. */
+ if (bp->valid == 0)
+ return 0;
+
+ /* Would BANK match upper bits? */
+ upper_bits ^= bp->um; /* What bits are different? */
+ upper_bits = ~upper_bits; /* Invert. */
+ upper_bits |= bp->uk; /* What bits don't matter for matching? */
+ upper_bits = ~upper_bits; /* Invert. */
+
+ if (upper_bits)
+ return 0;
+
+ /* Would BANK match lower bits? */
+ lower_bits ^= bp->lm; /* What bits are different? */
+ lower_bits = ~lower_bits; /* Invert. */
+ lower_bits |= bp->lk; /* What bits don't matter for matching? */
+ lower_bits = ~lower_bits; /* Invert. */
+
+ if (lower_bits)
+ return 0;
+
+ /* I always knew you'd be the one. */
+ return 1;
+}
+
+/* Given PHYS_ADDR, search memory controller banks for a match. */
+static struct bank_info *find_bank(unsigned long phys_addr)
+{
+ struct list_head *mctrl_head = &mctrl_list;
+ struct list_head *mctrl_entry = mctrl_head->next;
+
+ for (;;) {
+ struct mctrl_info *mp =
+ list_entry(mctrl_entry, struct mctrl_info, list);
+ int bank_no;
+
+ if (mctrl_entry == mctrl_head)
+ break;
+ mctrl_entry = mctrl_entry->next;
+
+ for (bank_no = 0; bank_no < CHMCTRL_NBANKS; bank_no++) {
+ struct bank_info *bp;
+
+ bp = &mp->logical_banks[bank_no];
+ if (bank_match(bp, phys_addr))
+ return bp;
+ }
+ }
+
+ return NULL;
+}
+
+/* This is the main purpose of this driver. */
+#define SYNDROME_MIN -1
+#define SYNDROME_MAX 144
+int chmc_getunumber(int syndrome_code,
+ unsigned long phys_addr,
+ char *buf, int buflen)
+{
+ struct bank_info *bp;
+ struct obp_mem_layout *prop;
+ int bank_in_controller, first_dimm;
+
+ bp = find_bank(phys_addr);
+ if (bp == NULL ||
+ syndrome_code < SYNDROME_MIN ||
+ syndrome_code > SYNDROME_MAX) {
+ buf[0] = '?';
+ buf[1] = '?';
+ buf[2] = '?';
+ buf[3] = '\0';
+ return 0;
+ }
+
+ prop = &bp->mp->layout_prop;
+ bank_in_controller = bp->bank_id & (CHMCTRL_NBANKS - 1);
+ first_dimm = (bank_in_controller & (CHMCTRL_NDGRPS - 1));
+ first_dimm *= CHMCTRL_NDIMMS;
+
+ if (syndrome_code != SYNDROME_MIN) {
+ struct obp_map *map;
+ int qword, where_in_line, where, map_index, map_offset;
+ unsigned int map_val;
+
+ /* Yaay, single bit error so we can figure out
+ * the exact dimm.
+ */
+ if (prop->symmetric)
+ map = &prop->map[0];
+ else
+ map = &prop->map[1];
+
+ /* Covert syndrome code into the way the bits are
+ * positioned on the bus.
+ */
+ if (syndrome_code < 144 - 16)
+ syndrome_code += 16;
+ else if (syndrome_code < 144)
+ syndrome_code -= (144 - 7);
+ else if (syndrome_code < (144 + 3))
+ syndrome_code -= (144 + 3 - 4);
+ else
+ syndrome_code -= 144 + 3;
+
+ /* All this magic has to do with how a cache line
+ * comes over the wire on Safari. A 64-bit line
+ * comes over in 4 quadword cycles, each of which
+ * transmit ECC/MTAG info as well as the actual
+ * data. 144 bits per quadword, 576 total.
+ */
+#define LINE_SIZE 64
+#define LINE_ADDR_MSK (LINE_SIZE - 1)
+#define QW_PER_LINE 4
+#define QW_BYTES (LINE_SIZE / QW_PER_LINE)
+#define QW_BITS 144
+#define LAST_BIT (576 - 1)
+
+ qword = (phys_addr & LINE_ADDR_MSK) / QW_BYTES;
+ where_in_line = ((3 - qword) * QW_BITS) + syndrome_code;
+ where = (LAST_BIT - where_in_line);
+ map_index = where >> 2;
+ map_offset = where & 0x3;
+ map_val = map->dimm_map[map_index];
+ map_val = ((map_val >> ((3 - map_offset) << 1)) & (2 - 1));
+
+ sprintf(buf, "%s, pin %3d",
+ prop->dimm_labels[first_dimm + map_val],
+ map->pin_map[where_in_line]);
+ } else {
+ int dimm;
+
+ /* Multi-bit error, we just dump out all the
+ * dimm labels associated with this bank.
+ */
+ for (dimm = 0; dimm < CHMCTRL_NDIMMS; dimm++) {
+ sprintf(buf, "%s ",
+ prop->dimm_labels[first_dimm + dimm]);
+ buf += strlen(buf);
+ }
+ }
+ return 0;
+}
+
+/* Accessing the registers is slightly complicated. If you want
+ * to get at the memory controller which is on the same processor
+ * the code is executing, you must use special ASI load/store else
+ * you go through the global mapping.
+ */
+static u64 read_mcreg(struct mctrl_info *mp, unsigned long offset)
+{
+ unsigned long ret;
+ int this_cpu = get_cpu();
+
+ if (mp->portid == this_cpu) {
+ __asm__ __volatile__("ldxa [%1] %2, %0"
+ : "=r" (ret)
+ : "r" (offset), "i" (ASI_MCU_CTRL_REG));
+ } else {
+ __asm__ __volatile__("ldxa [%1] %2, %0"
+ : "=r" (ret)
+ : "r" (mp->regs + offset),
+ "i" (ASI_PHYS_BYPASS_EC_E));
+ }
+ put_cpu();
+
+ return ret;
+}
+
+#if 0 /* currently unused */
+static void write_mcreg(struct mctrl_info *mp, unsigned long offset, u64 val)
+{
+ if (mp->portid == smp_processor_id()) {
+ __asm__ __volatile__("stxa %0, [%1] %2"
+ : : "r" (val),
+ "r" (offset), "i" (ASI_MCU_CTRL_REG));
+ } else {
+ __asm__ __volatile__("ldxa %0, [%1] %2"
+ : : "r" (val),
+ "r" (mp->regs + offset),
+ "i" (ASI_PHYS_BYPASS_EC_E));
+ }
+}
+#endif
+
+static void interpret_one_decode_reg(struct mctrl_info *mp, int which_bank, u64 val)
+{
+ struct bank_info *p = &mp->logical_banks[which_bank];
+
+ p->mp = mp;
+ p->bank_id = (CHMCTRL_NBANKS * mp->portid) + which_bank;
+ p->raw_reg = val;
+ p->valid = (val & MEM_DECODE_VALID) >> MEM_DECODE_VALID_SHIFT;
+ p->uk = (val & MEM_DECODE_UK) >> MEM_DECODE_UK_SHIFT;
+ p->um = (val & MEM_DECODE_UM) >> MEM_DECODE_UM_SHIFT;
+ p->lk = (val & MEM_DECODE_LK) >> MEM_DECODE_LK_SHIFT;
+ p->lm = (val & MEM_DECODE_LM) >> MEM_DECODE_LM_SHIFT;
+
+ p->base = (p->um);
+ p->base &= ~(p->uk);
+ p->base <<= PA_UPPER_BITS_SHIFT;
+
+ switch(p->lk) {
+ case 0xf:
+ default:
+ p->interleave = 1;
+ break;
+
+ case 0xe:
+ p->interleave = 2;
+ break;
+
+ case 0xc:
+ p->interleave = 4;
+ break;
+
+ case 0x8:
+ p->interleave = 8;
+ break;
+
+ case 0x0:
+ p->interleave = 16;
+ break;
+ };
+
+ /* UK[10] is reserved, and UK[11] is not set for the SDRAM
+ * bank size definition.
+ */
+ p->size = (((unsigned long)p->uk &
+ ((1UL << 10UL) - 1UL)) + 1UL) << PA_UPPER_BITS_SHIFT;
+ p->size /= p->interleave;
+}
+
+static void fetch_decode_regs(struct mctrl_info *mp)
+{
+ if (mp->layout_size == 0)
+ return;
+
+ interpret_one_decode_reg(mp, 0,
+ read_mcreg(mp, CHMCTRL_DECODE1));
+ interpret_one_decode_reg(mp, 1,
+ read_mcreg(mp, CHMCTRL_DECODE2));
+ interpret_one_decode_reg(mp, 2,
+ read_mcreg(mp, CHMCTRL_DECODE3));
+ interpret_one_decode_reg(mp, 3,
+ read_mcreg(mp, CHMCTRL_DECODE4));
+}
+
+static int init_one_mctrl(int node, int index)
+{
+ struct mctrl_info *mp = kmalloc(sizeof(*mp), GFP_KERNEL);
+ int portid = prom_getintdefault(node, "portid", -1);
+ struct linux_prom64_registers p_reg_prop;
+ int t;
+
+ if (!mp)
+ return -1;
+ memset(mp, 0, sizeof(*mp));
+ if (portid == -1)
+ goto fail;
+
+ mp->portid = portid;
+ mp->layout_size = prom_getproplen(node, "memory-layout");
+ if (mp->layout_size < 0)
+ mp->layout_size = 0;
+ if (mp->layout_size > sizeof(mp->layout_prop))
+ goto fail;
+
+ if (mp->layout_size > 0)
+ prom_getproperty(node, "memory-layout",
+ (char *) &mp->layout_prop,
+ mp->layout_size);
+
+ t = prom_getproperty(node, "reg",
+ (char *) &p_reg_prop,
+ sizeof(p_reg_prop));
+ if (t < 0 || p_reg_prop.reg_size != 0x48)
+ goto fail;
+
+ mp->regs = ioremap(p_reg_prop.phys_addr, p_reg_prop.reg_size);
+ if (mp->regs == NULL)
+ goto fail;
+
+ if (mp->layout_size != 0UL) {
+ mp->timing_control1 = read_mcreg(mp, CHMCTRL_TCTRL1);
+ mp->timing_control2 = read_mcreg(mp, CHMCTRL_TCTRL2);
+ mp->timing_control3 = read_mcreg(mp, CHMCTRL_TCTRL3);
+ mp->timing_control4 = read_mcreg(mp, CHMCTRL_TCTRL4);
+ mp->memaddr_control = read_mcreg(mp, CHMCTRL_MACTRL);
+ }
+
+ fetch_decode_regs(mp);
+
+ mp->index = index;
+
+ list_add(&mp->list, &mctrl_list);
+
+ /* Report the device. */
+ printk(KERN_INFO "chmc%d: US3 memory controller at %p [%s]\n",
+ mp->index,
+ mp->regs, (mp->layout_size ? "ACTIVE" : "INACTIVE"));
+
+ return 0;
+
+fail:
+ if (mp) {
+ if (mp->regs != NULL)
+ iounmap(mp->regs);
+ kfree(mp);
+ }
+ return -1;
+}
+
+static int __init probe_for_string(char *name, int index)
+{
+ int node = prom_getchild(prom_root_node);
+
+ while ((node = prom_searchsiblings(node, name)) != 0) {
+ int ret = init_one_mctrl(node, index);
+
+ if (!ret)
+ index++;
+
+ node = prom_getsibling(node);
+ if (!node)
+ break;
+ }
+
+ return index;
+}
+
+static int __init chmc_init(void)
+{
+ int index;
+
+ /* This driver is only for cheetah platforms. */
+ if (tlb_type != cheetah && tlb_type != cheetah_plus)
+ return -ENODEV;
+
+ index = probe_for_string("memory-controller", 0);
+ index = probe_for_string("mc-us3", index);
+
+ return 0;
+}
+
+static void __exit chmc_cleanup(void)
+{
+ struct list_head *head = &mctrl_list;
+ struct list_head *tmp = head->next;
+
+ for (;;) {
+ struct mctrl_info *p =
+ list_entry(tmp, struct mctrl_info, list);
+ if (tmp == head)
+ break;
+ tmp = tmp->next;
+
+ list_del(&p->list);
+ iounmap(p->regs);
+ kfree(p);
+ }
+}
+
+module_init(chmc_init);
+module_exit(chmc_cleanup);
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