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MIPS: Netlogic: Read memory from DRAM BARs 

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>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/5743/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
hifive-unleashed-5.1
Jayachandran C 2013-08-21 19:31:29 +05:30 committed by Ralf Baechle
parent 2c4f1ac562
commit a2ba6cd6e6
4 changed files with 65 additions and 0 deletions
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4
arch/mips/include/asm/netlogic/xlp-hal/bridge.h
View File

@ -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

3
arch/mips/include/asm/netlogic/xlp-hal/xlp.h
View File

@ -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__ */

35
arch/mips/netlogic/xlp/nlm_hal.c
View File

@ -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;
}

23
arch/mips/netlogic/xlp/setup.c
View File

@ -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();
}