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Subject[PATCH v6 08/23] drivers/fsi: Set slave SMODE to init communication
Date
From: Chris Bostic <cbostic@linux.vnet.ibm.com>

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: Chris Bostic <cbostic@linux.vnet.ibm.com>
Signed-off-by: Joel Stanley <joel@jms.id.au>
---
drivers/fsi/fsi-core.c | 75 ++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 75 insertions(+)

diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c
index c705ca2..b7b138b 100644
--- a/drivers/fsi/fsi-core.c
+++ b/drivers/fsi/fsi-core.c
@@ -21,6 +21,27 @@

#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);
@@ -117,6 +138,52 @@ 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);
@@ -155,6 +222,14 @@ 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.
*/
--
1.8.2.2
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