powerpc/mpc5200: Add PSC helpers for bestcomm engine

Simplify the interface for setting up bestcomm DMA to PSCs by adding
some helper functions.  The helper function sets the correct values
for the initator and ipr values in PSC DMA tasks based on the PSC
number.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

2 files changed, 100 insertions, 0 deletions

diff --git a/arch/powerpc/sysdev/bestcomm/gen_bd.c b/arch/powerpc/sysdev/bestcomm/gen_bd.c
index 8d33eafbb3f4..a3a134c35b0a 100644
--- a/arch/powerpc/sysdev/bestcomm/gen_bd.c
+++ b/arch/powerpc/sysdev/bestcomm/gen_bd.c
@@ -20,6 +20,7 @@
 #include <asm/io.h>
 
 #include <asm/mpc52xx.h>
+#include <asm/mpc52xx_psc.h>
 
 #include "bestcomm.h"
 #include "bestcomm_priv.h"
@@ -253,6 +254,100 @@ bcom_gen_bd_tx_release(struct bcom_task *tsk)
 }
 EXPORT_SYMBOL_GPL(bcom_gen_bd_tx_release);
 
+/* ---------------------------------------------------------------------
+ * PSC support code
+ */
+
+/**
+ * bcom_psc_parameters - Bestcomm initialization value table for PSC devices
+ *
+ * This structure is only used internally.  It is a lookup table for PSC
+ * specific parameters to bestcomm tasks.
+ */
+static struct bcom_psc_params {
+        int rx_initiator;
+        int rx_ipr;
+        int tx_initiator;
+        int tx_ipr;
+} bcom_psc_params[] = {
+        [0] = {
+                .rx_initiator = BCOM_INITIATOR_PSC1_RX,
+                .rx_ipr = BCOM_IPR_PSC1_RX,
+                .tx_initiator = BCOM_INITIATOR_PSC1_TX,
+                .tx_ipr = BCOM_IPR_PSC1_TX,
+        },
+        [1] = {
+                .rx_initiator = BCOM_INITIATOR_PSC2_RX,
+                .rx_ipr = BCOM_IPR_PSC2_RX,
+                .tx_initiator = BCOM_INITIATOR_PSC2_TX,
+                .tx_ipr = BCOM_IPR_PSC2_TX,
+        },
+        [2] = {
+                .rx_initiator = BCOM_INITIATOR_PSC3_RX,
+                .rx_ipr = BCOM_IPR_PSC3_RX,
+                .tx_initiator = BCOM_INITIATOR_PSC3_TX,
+                .tx_ipr = BCOM_IPR_PSC3_TX,
+        },
+        [3] = {
+                .rx_initiator = BCOM_INITIATOR_PSC4_RX,
+                .rx_ipr = BCOM_IPR_PSC4_RX,
+                .tx_initiator = BCOM_INITIATOR_PSC4_TX,
+                .tx_ipr = BCOM_IPR_PSC4_TX,
+        },
+        [4] = {
+                .rx_initiator = BCOM_INITIATOR_PSC5_RX,
+                .rx_ipr = BCOM_IPR_PSC5_RX,
+                .tx_initiator = BCOM_INITIATOR_PSC5_TX,
+                .tx_ipr = BCOM_IPR_PSC5_TX,
+        },
+        [5] = {
+                .rx_initiator = BCOM_INITIATOR_PSC6_RX,
+                .rx_ipr = BCOM_IPR_PSC6_RX,
+                .tx_initiator = BCOM_INITIATOR_PSC6_TX,
+                .tx_ipr = BCOM_IPR_PSC6_TX,
+        },
+};
+
+/**
+ * bcom_psc_gen_bd_rx_init - Allocate a receive bcom_task for a PSC port
+ * @psc_num:    Number of the PSC to allocate a task for
+ * @queue_len:  number of buffer descriptors to allocate for the task
+ * @fifo:       physical address of FIFO register
+ * @maxbufsize: Maximum receive data size in bytes.
+ *
+ * Allocate a bestcomm task structure for receiving data from a PSC.
+ */
+struct bcom_task * bcom_psc_gen_bd_rx_init(unsigned psc_num, int queue_len,
+                                           phys_addr_t fifo, int maxbufsize)
+{
+        if (psc_num >= MPC52xx_PSC_MAXNUM)
+                return NULL;
+
+        return bcom_gen_bd_rx_init(queue_len, fifo,
+                                   bcom_psc_params[psc_num].rx_initiator,
+                                   bcom_psc_params[psc_num].rx_ipr,
+                                   maxbufsize);
+}
+EXPORT_SYMBOL_GPL(bcom_psc_gen_bd_rx_init);
+
+/**
+ * bcom_psc_gen_bd_tx_init - Allocate a transmit bcom_task for a PSC port
+ * @psc_num:    Number of the PSC to allocate a task for
+ * @queue_len:  number of buffer descriptors to allocate for the task
+ * @fifo:       physical address of FIFO register
+ *
+ * Allocate a bestcomm task structure for transmitting data to a PSC.
+ */
+struct bcom_task *
+bcom_psc_gen_bd_tx_init(unsigned psc_num, int queue_len, phys_addr_t fifo)
+{
+        struct psc;
+        return bcom_gen_bd_tx_init(queue_len, fifo,
+                                   bcom_psc_params[psc_num].tx_initiator,
+                                   bcom_psc_params[psc_num].tx_ipr);
+}
+EXPORT_SYMBOL_GPL(bcom_psc_gen_bd_tx_init);
+
 
 MODULE_DESCRIPTION("BestComm General Buffer Descriptor tasks driver");
 MODULE_AUTHOR("Jeff Gibbons <jeff.gibbons@appspec.com>");
diff --git a/arch/powerpc/sysdev/bestcomm/gen_bd.h b/arch/powerpc/sysdev/bestcomm/gen_bd.h
index 5b6fa803c6aa..de47260e69da 100644
--- a/arch/powerpc/sysdev/bestcomm/gen_bd.h
+++ b/arch/powerpc/sysdev/bestcomm/gen_bd.h
@@ -44,5 +44,10 @@ extern void
 bcom_gen_bd_tx_release(struct bcom_task *tsk);
 
 
+/* PSC support utility wrappers */
+struct bcom_task * bcom_psc_gen_bd_rx_init(unsigned psc_num, int queue_len,
+                                           phys_addr_t fifo, int maxbufsize);
+struct bcom_task * bcom_psc_gen_bd_tx_init(unsigned psc_num, int queue_len,
+                                           phys_addr_t fifo);
 #endif  /* __BESTCOMM_GEN_BD_H__ */