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[PATCH 01/10 v2] MIPS: Netlogic: Read memory from DRAM BARs

To: ralf@linux-mips.org, linux-mips@linux-mips.org
Subject: [PATCH 01/10 v2] MIPS: Netlogic: Read memory from DRAM BARs
From: "Jayachandran C" <jchandra@broadcom.com>
Date: Wed, 21 Aug 2013 19:31:29 +0530
Cc: "Jayachandran C" <jchandra@broadcom.com>
In-reply-to: <1376212440-21038-2-git-send-email-jchandra@broadcom.com>
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Read the memory from the Bridge DRAM BARs, if it is not passed in
from the device tree. This will allow us to remove memory configuration
from built in device trees.

Signed-off-by: Jayachandran C <jchandra@broadcom.com>
---
[Updated to fix a deleted character in the patch, which caused a compile error]

 arch/mips/include/asm/netlogic/xlp-hal/bridge.h |    4 +++
 arch/mips/include/asm/netlogic/xlp-hal/xlp.h    |    3 ++
 arch/mips/netlogic/xlp/nlm_hal.c                |   35 +++++++++++++++++++++++
 arch/mips/netlogic/xlp/setup.c                  |   23 +++++++++++++++
 4 files changed, 65 insertions(+)

diff --git a/arch/mips/include/asm/netlogic/xlp-hal/bridge.h 
b/arch/mips/include/asm/netlogic/xlp-hal/bridge.h
index 790f0f1..4e8eacb 100644
--- a/arch/mips/include/asm/netlogic/xlp-hal/bridge.h
+++ b/arch/mips/include/asm/netlogic/xlp-hal/bridge.h
@@ -88,6 +88,7 @@
 #define BRIDGE_DRAM_LIMIT6             0x22
 #define BRIDGE_DRAM_LIMIT7             0x23
 
+#define BRIDGE_DRAM_NODE_TRANSLN(i)    (0x24 + (i))
 #define BRIDGE_DRAM_NODE_TRANSLN0      0x24
 #define BRIDGE_DRAM_NODE_TRANSLN1      0x25
 #define BRIDGE_DRAM_NODE_TRANSLN2      0x26
@@ -96,6 +97,8 @@
 #define BRIDGE_DRAM_NODE_TRANSLN5      0x29
 #define BRIDGE_DRAM_NODE_TRANSLN6      0x2a
 #define BRIDGE_DRAM_NODE_TRANSLN7      0x2b
+
+#define BRIDGE_DRAM_CHNL_TRANSLN(i)    (0x2c + (i))
 #define BRIDGE_DRAM_CHNL_TRANSLN0      0x2c
 #define BRIDGE_DRAM_CHNL_TRANSLN1      0x2d
 #define BRIDGE_DRAM_CHNL_TRANSLN2      0x2e
@@ -104,6 +107,7 @@
 #define BRIDGE_DRAM_CHNL_TRANSLN5      0x31
 #define BRIDGE_DRAM_CHNL_TRANSLN6      0x32
 #define BRIDGE_DRAM_CHNL_TRANSLN7      0x33
+
 #define BRIDGE_PCIEMEM_BASE0           0x34
 #define BRIDGE_PCIEMEM_BASE1           0x35
 #define BRIDGE_PCIEMEM_BASE2           0x36
diff --git a/arch/mips/include/asm/netlogic/xlp-hal/xlp.h 
b/arch/mips/include/asm/netlogic/xlp-hal/xlp.h
index f4ea0f7..d59cdd6 100644
--- a/arch/mips/include/asm/netlogic/xlp-hal/xlp.h
+++ b/arch/mips/include/asm/netlogic/xlp-hal/xlp.h
@@ -59,6 +59,9 @@ void xlp_wakeup_secondary_cpus(void);
 
 void xlp_mmu_init(void);
 void nlm_hal_init(void);
+int xlp_get_dram_map(int n, uint64_t *dram_map);
+
+/* Device tree related */
 void *xlp_dt_init(void *fdtp);
 
 #endif /* !__ASSEMBLY__ */
diff --git a/arch/mips/netlogic/xlp/nlm_hal.c b/arch/mips/netlogic/xlp/nlm_hal.c
index 87560e4..6f2c210 100644
--- a/arch/mips/netlogic/xlp/nlm_hal.c
+++ b/arch/mips/netlogic/xlp/nlm_hal.c
@@ -44,6 +44,7 @@
 #include <asm/netlogic/haldefs.h>
 #include <asm/netlogic/xlp-hal/iomap.h>
 #include <asm/netlogic/xlp-hal/xlp.h>
+#include <asm/netlogic/xlp-hal/bridge.h>
 #include <asm/netlogic/xlp-hal/pic.h>
 #include <asm/netlogic/xlp-hal/sys.h>
 
@@ -142,3 +143,37 @@ unsigned int nlm_get_cpu_frequency(void)
 {
        return nlm_get_core_frequency(0, 0);
 }
+
+/*
+ * Fills upto 8 pairs of entries containing the DRAM map of a node
+ * if n < 0, get dram map for all nodes
+ */
+int xlp_get_dram_map(int n, uint64_t *dram_map)
+{
+       uint64_t bridgebase, base, lim;
+       uint32_t val;
+       int i, node, rv;
+
+       /* Look only at mapping on Node 0, we don't handle crazy configs */
+       bridgebase = nlm_get_bridge_regbase(0);
+       rv = 0;
+       for (i = 0; i < 8; i++) {
+               val = nlm_read_bridge_reg(bridgebase,
+                                       BRIDGE_DRAM_NODE_TRANSLN(i));
+               node = (val >> 1) & 0x3;
+               if (n >= 0 && n != node)
+                       continue;
+               val = nlm_read_bridge_reg(bridgebase, BRIDGE_DRAM_BAR(i));
+               val = (val >>  12) & 0xfffff;
+               base = (uint64_t) val << 20;
+               val = nlm_read_bridge_reg(bridgebase, BRIDGE_DRAM_LIMIT(i));
+               val = (val >>  12) & 0xfffff;
+               if (val == 0)   /* BAR not used */
+                       continue;
+               lim = ((uint64_t)val + 1) << 20;
+               dram_map[rv] = base;
+               dram_map[rv + 1] = lim;
+               rv += 2;
+       }
+       return rv;
+}
diff --git a/arch/mips/netlogic/xlp/setup.c b/arch/mips/netlogic/xlp/setup.c
index 7b638f7..7718368 100644
--- a/arch/mips/netlogic/xlp/setup.c
+++ b/arch/mips/netlogic/xlp/setup.c
@@ -73,6 +73,23 @@ static void nlm_fixup_mem(void)
        }
 }
 
+static void __init xlp_init_mem_from_bars(void)
+{
+       uint64_t map[16];
+       int i, n;
+
+       n = xlp_get_dram_map(-1, map);  /* -1: info for all nodes */
+       for (i = 0; i < n; i += 2) {
+               /* exclude 0x1000_0000-0x2000_0000, u-boot device */
+               if (map[i] <= 0x10000000 && map[i+1] > 0x10000000)
+                       map[i+1] = 0x10000000;
+               if (map[i] > 0x10000000 && map[i] < 0x20000000)
+                       map[i] = 0x20000000;
+
+               add_memory_region(map[i], map[i+1] - map[i], BOOT_MEM_RAM);
+       }
+}
+
 void __init plat_mem_setup(void)
 {
        panic_timeout   = 5;
@@ -82,6 +99,12 @@ void __init plat_mem_setup(void)
 
        /* memory and bootargs from DT */
        early_init_devtree(initial_boot_params);
+
+       if (boot_mem_map.nr_map == 0) {
+               pr_info("Using DRAM BARs for memory map.\n");
+               xlp_init_mem_from_bars();
+       }
+       /* Calculate and setup wired entries for mapped kernel */
        nlm_fixup_mem();
 }
 
-- 
1.7.9.5



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