drivers/fsi: Set slave SMODE to init communication

Set CFAM to appropriate ID so that the controlling master can manage
link memory ranges.  Add slave engine register definitions.

Includes changes from Jeremy Kerr <jk@ozlabs.org>.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Christopher Bostic <cbostic@linux.vnet.ibm.com>
Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c
index 9d9adc1..04795f2 100644 (file)
--- a/drivers/fsi/fsi-core.c
+++ b/drivers/fsi/fsi-core.c
@@ -22,6 +22,27 @@
 
 #include "fsi-master.h"
 
+#define FSI_SLAVE_BASE                 0x800
+
+/*
+ * FSI slave engine control register offsets
+ */
+#define FSI_SMODE                      0x0     /* R/W: Mode register */
+
+/*
+ * SMODE fields
+ */
+#define FSI_SMODE_WSC          0x80000000      /* Warm start done */
+#define FSI_SMODE_ECRC         0x20000000      /* Hw CRC check */
+#define FSI_SMODE_SID_SHIFT    24              /* ID shift */
+#define FSI_SMODE_SID_MASK     3               /* ID Mask */
+#define FSI_SMODE_ED_SHIFT     20              /* Echo delay shift */
+#define FSI_SMODE_ED_MASK      0xf             /* Echo delay mask */
+#define FSI_SMODE_SD_SHIFT     16              /* Send delay shift */
+#define FSI_SMODE_SD_MASK      0xf             /* Send delay mask */
+#define FSI_SMODE_LBCRR_SHIFT  8               /* Clk ratio shift */
+#define FSI_SMODE_LBCRR_MASK   0xf             /* Clk ratio mask */
+
 #define FSI_SLAVE_SIZE_23b             0x800000
 
 static DEFINE_IDA(master_ida);
@@ -94,6 +115,52 @@ static int fsi_slave_write(struct fsi_slave *slave, uint32_t addr,
                        addr, val, size);
 }
 
+/* Encode slave local bus echo delay */
+static inline uint32_t fsi_smode_echodly(int x)
+{
+       return (x & FSI_SMODE_ED_MASK) << FSI_SMODE_ED_SHIFT;
+}
+
+/* Encode slave local bus send delay */
+static inline uint32_t fsi_smode_senddly(int x)
+{
+       return (x & FSI_SMODE_SD_MASK) << FSI_SMODE_SD_SHIFT;
+}
+
+/* Encode slave local bus clock rate ratio */
+static inline uint32_t fsi_smode_lbcrr(int x)
+{
+       return (x & FSI_SMODE_LBCRR_MASK) << FSI_SMODE_LBCRR_SHIFT;
+}
+
+/* Encode slave ID */
+static inline uint32_t fsi_smode_sid(int x)
+{
+       return (x & FSI_SMODE_SID_MASK) << FSI_SMODE_SID_SHIFT;
+}
+
+static const uint32_t fsi_slave_smode(int id)
+{
+       return FSI_SMODE_WSC | FSI_SMODE_ECRC
+               | fsi_smode_sid(id)
+               | fsi_smode_echodly(0xf) | fsi_smode_senddly(0xf)
+               | fsi_smode_lbcrr(0x8);
+}
+
+static int fsi_slave_set_smode(struct fsi_master *master, int link, int id)
+{
+       uint32_t smode;
+
+       /* set our smode register with the slave ID field to 0; this enables
+        * extended slave addressing
+        */
+       smode = fsi_slave_smode(id);
+       smode = cpu_to_be32(smode);
+
+       return fsi_master_write(master, link, id, FSI_SLAVE_BASE + FSI_SMODE,
+                       &smode, sizeof(smode));
+}
+
 static void fsi_slave_release(struct device *dev)
 {
        struct fsi_slave *slave = to_fsi_slave(dev);
@@ -132,6 +199,14 @@ static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id)
        dev_info(&master->dev, "fsi: found chip %08x at %02x:%02x:%02x\n",
                        chip_id, master->idx, link, id);
 
+       rc = fsi_slave_set_smode(master, link, id);
+       if (rc) {
+               dev_warn(&master->dev,
+                               "can't set smode on slave:%02x:%02x %d\n",
+                               link, id, rc);
+               return -ENODEV;
+       }
+
        /* We can communicate with a slave; create the slave device and
         * register.
         */