summaryrefslogtreecommitdiff
path: root/arch/powerpc/sysdev/qe_lib
diff options
context:
space:
mode:
authorHaiying Wang <Haiying.Wang@freescale.com>2009-05-01 23:40:48 +0400
committerKumar Gala <galak@kernel.crashing.org>2009-05-19 09:50:24 +0400
commit98ca77af23da6682bb3e34961a3f32e2c064a4ce (patch)
tree7c022d718c8933d25cf59c71ace2683731f905e9 /arch/powerpc/sysdev/qe_lib
parent345f84227b50e90329dd303499024603596566f4 (diff)
downloadlinux-98ca77af23da6682bb3e34961a3f32e2c064a4ce.tar.xz
powerpc/qe: update QE Serial Number
The latest QE chip may have more Serial Number(SNUM)s of thread to use. We will get the number of SNUMs from device tree by reading the new property "fsl,qe-num-snums", and set 28 as the default number of SNUMs so that it is compatible with the old QE chips' device trees which don't have this new property. The macro QE_NUM_OF_SNUM is defined as the maximum number in QE snum table which is 256. Also we update the snum_init[] array with 18 more new SNUMs which are confirmed to be useful on new chip. Signed-off-by: Haiying Wang <Haiying.Wang@freescale.com> Acked-by: Timur Tabi <timur@freescale.com> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/sysdev/qe_lib')
-rw-r--r--arch/powerpc/sysdev/qe_lib/qe.c47
1 files changed, 43 insertions, 4 deletions
diff --git a/arch/powerpc/sysdev/qe_lib/qe.c b/arch/powerpc/sysdev/qe_lib/qe.c
index 2533677ae5eb..b28b0e512d67 100644
--- a/arch/powerpc/sysdev/qe_lib/qe.c
+++ b/arch/powerpc/sysdev/qe_lib/qe.c
@@ -61,6 +61,7 @@ struct qe_immap __iomem *qe_immr;
EXPORT_SYMBOL(qe_immr);
static struct qe_snum snums[QE_NUM_OF_SNUM]; /* Dynamically allocated SNUMs */
+static unsigned int qe_num_of_snum;
static phys_addr_t qebase = -1;
@@ -264,10 +265,14 @@ static void qe_snums_init(void)
0x04, 0x05, 0x0C, 0x0D, 0x14, 0x15, 0x1C, 0x1D,
0x24, 0x25, 0x2C, 0x2D, 0x34, 0x35, 0x88, 0x89,
0x98, 0x99, 0xA8, 0xA9, 0xB8, 0xB9, 0xC8, 0xC9,
- 0xD8, 0xD9, 0xE8, 0xE9,
+ 0xD8, 0xD9, 0xE8, 0xE9, 0x08, 0x09, 0x18, 0x19,
+ 0x28, 0x29, 0x38, 0x39, 0x48, 0x49, 0x58, 0x59,
+ 0x68, 0x69, 0x78, 0x79, 0x80, 0x81,
};
- for (i = 0; i < QE_NUM_OF_SNUM; i++) {
+ qe_num_of_snum = qe_get_num_of_snums();
+
+ for (i = 0; i < qe_num_of_snum; i++) {
snums[i].num = snum_init[i];
snums[i].state = QE_SNUM_STATE_FREE;
}
@@ -280,7 +285,7 @@ int qe_get_snum(void)
int i;
spin_lock_irqsave(&qe_lock, flags);
- for (i = 0; i < QE_NUM_OF_SNUM; i++) {
+ for (i = 0; i < qe_num_of_snum; i++) {
if (snums[i].state == QE_SNUM_STATE_FREE) {
snums[i].state = QE_SNUM_STATE_USED;
snum = snums[i].num;
@@ -297,7 +302,7 @@ void qe_put_snum(u8 snum)
{
int i;
- for (i = 0; i < QE_NUM_OF_SNUM; i++) {
+ for (i = 0; i < qe_num_of_snum; i++) {
if (snums[i].num == snum) {
snums[i].state = QE_SNUM_STATE_FREE;
break;
@@ -603,3 +608,37 @@ unsigned int qe_get_num_of_risc(void)
}
EXPORT_SYMBOL(qe_get_num_of_risc);
+unsigned int qe_get_num_of_snums(void)
+{
+ struct device_node *qe;
+ int size;
+ unsigned int num_of_snums;
+ const u32 *prop;
+
+ num_of_snums = 28; /* The default number of snum for threads is 28 */
+ qe = of_find_compatible_node(NULL, NULL, "fsl,qe");
+ if (!qe) {
+ /* Older devices trees did not have an "fsl,qe"
+ * compatible property, so we need to look for
+ * the QE node by name.
+ */
+ qe = of_find_node_by_type(NULL, "qe");
+ if (!qe)
+ return num_of_snums;
+ }
+
+ prop = of_get_property(qe, "fsl,qe-num-snums", &size);
+ if (prop && size == sizeof(*prop)) {
+ num_of_snums = *prop;
+ if ((num_of_snums < 28) || (num_of_snums > QE_NUM_OF_SNUM)) {
+ /* No QE ever has fewer than 28 SNUMs */
+ pr_err("QE: number of snum is invalid\n");
+ return -EINVAL;
+ }
+ }
+
+ of_node_put(qe);
+
+ return num_of_snums;
+}
+EXPORT_SYMBOL(qe_get_num_of_snums);