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Diffstat (limited to 'arch/powerpc/platforms/pasemi/dma_lib.c')
-rw-r--r--arch/powerpc/platforms/pasemi/dma_lib.c144
1 files changed, 144 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/pasemi/dma_lib.c b/arch/powerpc/platforms/pasemi/dma_lib.c
index c529d8dff39..217af321b0c 100644
--- a/arch/powerpc/platforms/pasemi/dma_lib.c
+++ b/arch/powerpc/platforms/pasemi/dma_lib.c
@@ -17,6 +17,7 @@
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
+#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/pci.h>
@@ -26,6 +27,8 @@
#define MAX_TXCH 64
#define MAX_RXCH 64
+#define MAX_FLAGS 64
+#define MAX_FUN 8
static struct pasdma_status *dma_status;
@@ -43,6 +46,8 @@ static struct pci_dev *dma_pdev;
static DECLARE_BITMAP(txch_free, MAX_TXCH);
static DECLARE_BITMAP(rxch_free, MAX_RXCH);
+static DECLARE_BITMAP(flags_free, MAX_FLAGS);
+static DECLARE_BITMAP(fun_free, MAX_FUN);
/* pasemi_read_iob_reg - read IOB register
* @reg: Register to read (offset into PCI CFG space)
@@ -373,6 +378,106 @@ void pasemi_dma_free_buf(struct pasemi_dmachan *chan, int size,
}
EXPORT_SYMBOL(pasemi_dma_free_buf);
+/* pasemi_dma_alloc_flag - Allocate a flag (event) for channel syncronization
+ *
+ * Allocates a flag for use with channel syncronization (event descriptors).
+ * Returns allocated flag (0-63), < 0 on error.
+ */
+int pasemi_dma_alloc_flag(void)
+{
+ int bit;
+
+retry:
+ bit = find_next_bit(flags_free, MAX_FLAGS, 0);
+ if (bit >= MAX_FLAGS)
+ return -ENOSPC;
+ if (!test_and_clear_bit(bit, flags_free))
+ goto retry;
+
+ return bit;
+}
+EXPORT_SYMBOL(pasemi_dma_alloc_flag);
+
+
+/* pasemi_dma_free_flag - Deallocates a flag (event)
+ * @flag: Flag number to deallocate
+ *
+ * Frees up a flag so it can be reused for other purposes.
+ */
+void pasemi_dma_free_flag(int flag)
+{
+ BUG_ON(test_bit(flag, flags_free));
+ BUG_ON(flag >= MAX_FLAGS);
+ set_bit(flag, flags_free);
+}
+EXPORT_SYMBOL(pasemi_dma_free_flag);
+
+
+/* pasemi_dma_set_flag - Sets a flag (event) to 1
+ * @flag: Flag number to set active
+ *
+ * Sets the flag provided to 1.
+ */
+void pasemi_dma_set_flag(int flag)
+{
+ BUG_ON(flag >= MAX_FLAGS);
+ if (flag < 32)
+ pasemi_write_dma_reg(PAS_DMA_TXF_SFLG0, 1 << flag);
+ else
+ pasemi_write_dma_reg(PAS_DMA_TXF_SFLG1, 1 << flag);
+}
+EXPORT_SYMBOL(pasemi_dma_set_flag);
+
+/* pasemi_dma_clear_flag - Sets a flag (event) to 0
+ * @flag: Flag number to set inactive
+ *
+ * Sets the flag provided to 0.
+ */
+void pasemi_dma_clear_flag(int flag)
+{
+ BUG_ON(flag >= MAX_FLAGS);
+ if (flag < 32)
+ pasemi_write_dma_reg(PAS_DMA_TXF_CFLG0, 1 << flag);
+ else
+ pasemi_write_dma_reg(PAS_DMA_TXF_CFLG1, 1 << flag);
+}
+EXPORT_SYMBOL(pasemi_dma_clear_flag);
+
+/* pasemi_dma_alloc_fun - Allocate a function engine
+ *
+ * Allocates a function engine to use for crypto/checksum offload
+ * Returns allocated engine (0-8), < 0 on error.
+ */
+int pasemi_dma_alloc_fun(void)
+{
+ int bit;
+
+retry:
+ bit = find_next_bit(fun_free, MAX_FLAGS, 0);
+ if (bit >= MAX_FLAGS)
+ return -ENOSPC;
+ if (!test_and_clear_bit(bit, fun_free))
+ goto retry;
+
+ return bit;
+}
+EXPORT_SYMBOL(pasemi_dma_alloc_fun);
+
+
+/* pasemi_dma_free_fun - Deallocates a function engine
+ * @flag: Engine number to deallocate
+ *
+ * Frees up a function engine so it can be used for other purposes.
+ */
+void pasemi_dma_free_fun(int fun)
+{
+ BUG_ON(test_bit(fun, fun_free));
+ BUG_ON(fun >= MAX_FLAGS);
+ set_bit(fun, fun_free);
+}
+EXPORT_SYMBOL(pasemi_dma_free_fun);
+
+
static void *map_onedev(struct pci_dev *p, int index)
{
struct device_node *dn;
@@ -410,6 +515,7 @@ int pasemi_dma_init(void)
struct resource res;
struct device_node *dn;
int i, intf, err = 0;
+ unsigned long timeout;
u32 tmp;
if (!machine_is(pasemi))
@@ -478,6 +584,44 @@ int pasemi_dma_init(void)
for (i = 0; i < MAX_RXCH; i++)
__set_bit(i, rxch_free);
+ timeout = jiffies + HZ;
+ pasemi_write_dma_reg(PAS_DMA_COM_RXCMD, 0);
+ while (pasemi_read_dma_reg(PAS_DMA_COM_RXSTA) & 1) {
+ if (time_after(jiffies, timeout)) {
+ pr_warning("Warning: Could not disable RX section\n");
+ break;
+ }
+ }
+
+ timeout = jiffies + HZ;
+ pasemi_write_dma_reg(PAS_DMA_COM_TXCMD, 0);
+ while (pasemi_read_dma_reg(PAS_DMA_COM_TXSTA) & 1) {
+ if (time_after(jiffies, timeout)) {
+ pr_warning("Warning: Could not disable TX section\n");
+ break;
+ }
+ }
+
+ /* setup resource allocations for the different DMA sections */
+ tmp = pasemi_read_dma_reg(PAS_DMA_COM_CFG);
+ pasemi_write_dma_reg(PAS_DMA_COM_CFG, tmp | 0x18000000);
+
+ /* enable tx section */
+ pasemi_write_dma_reg(PAS_DMA_COM_TXCMD, PAS_DMA_COM_TXCMD_EN);
+
+ /* enable rx section */
+ pasemi_write_dma_reg(PAS_DMA_COM_RXCMD, PAS_DMA_COM_RXCMD_EN);
+
+ for (i = 0; i < MAX_FLAGS; i++)
+ __set_bit(i, flags_free);
+
+ for (i = 0; i < MAX_FUN; i++)
+ __set_bit(i, fun_free);
+
+ /* clear all status flags */
+ pasemi_write_dma_reg(PAS_DMA_TXF_CFLG0, 0xffffffff);
+ pasemi_write_dma_reg(PAS_DMA_TXF_CFLG1, 0xffffffff);
+
printk(KERN_INFO "PA Semi PWRficient DMA library initialized "
"(%d tx, %d rx channels)\n", num_txch, num_rxch);