85xx: Add is_serdes_configured() support to MPC8536 SERDES

Add the ability to determine if a given IP block connected on SERDES is
configured.  This is useful for things like PCIe and SRIO since they are
only ever connected on SERDES.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

2 files changed, 114 insertions, 18 deletions

diff --git a/arch/powerpc/cpu/mpc85xx/mpc8536_serdes.c b/arch/powerpc/cpu/mpc85xx/mpc8536_serdes.c
index cb6a6f0..7e72f5f 100644
--- a/arch/powerpc/cpu/mpc85xx/mpc8536_serdes.c
+++ b/arch/powerpc/cpu/mpc85xx/mpc8536_serdes.c
@@ -1,17 +1,31 @@
 /*
- * Copyright (C) 2008 Freescale Semicondutor, Inc.
+ * Copyright 2008,2010 Freescale Semiconductor, Inc.
  *	Dave Liu <daveliu@freescale.com>
  *
- * This program is free software; you can redistribute  it and/or modify it
- * under  the terms of  the GNU General  Public License as published by the
- * Free Software Foundation;  either version 2 of the  License, or (at your
- * option) any later version.
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
  */
 
 #include <config.h>
 #include <common.h>
 #include <asm/io.h>
 #include <asm/immap_85xx.h>
+#include <asm/fsl_serdes.h>
 
 /* PORDEVSR register */
 #define GUTS_PORDEVSR_OFFS		0xc
@@ -52,6 +66,61 @@
 #define FSL_SRDSCR3_LANEE_SGMII	0x00000000
 #define FSL_SRDSCR3_LANEE_SATA	0x00150005
 
+
+#define SRDS1_MAX_LANES		8
+#define SRDS2_MAX_LANES		2
+
+static u8 serdes1_cfg_tbl[][SRDS1_MAX_LANES] = {
+	[0x2] = {PCIE1, PCIE1, PCIE1, PCIE1, NONE, NONE, NONE, NONE},
+	[0x3] = {PCIE1, PCIE1, PCIE1, PCIE1, PCIE1, PCIE1, PCIE1, PCIE1},
+	[0x5] = {PCIE1, PCIE1, PCIE1, PCIE1, PCIE2, PCIE2, PCIE2, PCIE2},
+	[0x7] = {PCIE1, PCIE1, PCIE1, PCIE1, PCIE2, PCIE2, PCIE3, PCIE3},
+};
+
+static u8 serdes2_cfg_tbl[][SRDS2_MAX_LANES] = {
+	[0x1] = {SATA1, SATA2},
+	[0x3] = {SATA1, NONE},
+	[0x4] = {SGMII_TSEC1, SGMII_TSEC3},
+	[0x6] = {SGMII_TSEC1, NONE},
+};
+
+int is_serdes_configured(enum srds_prtcl device)
+{
+	int i;
+	ccsr_gur_t *gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
+	u32 pordevsr = in_be32(&gur->pordevsr);
+	u32 srds1_cfg = (pordevsr & MPC85xx_PORDEVSR_IO_SEL) >>
+				MPC85xx_PORDEVSR_IO_SEL_SHIFT;
+
+	u32 srds2_cfg = (pordevsr & MPC85xx_PORDEVSR_SRDS2_IO_SEL) >>
+				GUTS_PORDEVSR_SERDES2_IO_SEL_SHIFT;
+
+	debug("%s: dev = %d\n", __FUNCTION__, device);
+	debug("PORDEVSR[IO_SEL] = %x\n", srds1_cfg);
+	debug("PORDEVSR[SRDS2_IO_SEL] = %x\n", srds2_cfg);
+
+	if (srds1_cfg > ARRAY_SIZE(serdes1_cfg_tbl)) {
+		printf("Invalid PORDEVSR[IO_SEL] = %d\n", srds1_cfg);
+		return 0;
+	}
+
+	if (srds2_cfg > ARRAY_SIZE(serdes2_cfg_tbl)) {
+		printf("Invalid PORDEVSR[SRDS2_IO_SEL] = %d\n", srds2_cfg);
+		return 0;
+	}
+
+	for (i = 0; i < SRDS1_MAX_LANES; i++) {
+		if (serdes1_cfg_tbl[srds1_cfg][i] == device)
+			return 1;
+	}
+	for (i = 0; i < SRDS2_MAX_LANES; i++) {
+		if (serdes2_cfg_tbl[srds2_cfg][i] == device)
+			return 1;
+	}
+
+	return 0;
+}
+
 void fsl_serdes_init(void)
 {
 	void *guts = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
diff --git a/arch/powerpc/include/asm/fsl_serdes.h b/arch/powerpc/include/asm/fsl_serdes.h
index 6da4b6f..d4839f4 100644
--- a/arch/powerpc/include/asm/fsl_serdes.h
+++ b/arch/powerpc/include/asm/fsl_serdes.h
@@ -1,21 +1,48 @@
+/*
+ * Copyright 2010 Freescale Semiconductor, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
 #ifndef __FSL_SERDES_H
 #define __FSL_SERDES_H
 
 #include <config.h>
 
-#define FSL_SERDES_CLK_100		(0 << 28)
-#define FSL_SERDES_CLK_125		(1 << 28)
-#define FSL_SERDES_CLK_150		(3 << 28)
-#define FSL_SERDES_PROTO_SATA		0
-#define FSL_SERDES_PROTO_PEX		1
-#define FSL_SERDES_PROTO_PEX_X2		2
-#define FSL_SERDES_PROTO_SGMII		3
-#define FSL_SERDES_VDD_1V		1
+enum srds_prtcl {
+	NONE = 0,
+	PCIE1,
+	PCIE2,
+	PCIE3,
+	PCIE4,
+	SATA1,
+	SATA2,
+	SRIO1,
+	SRIO2,
+	SGMII_FM1,
+	SGMII_FM2,
+	SGMII_TSEC1,
+	SGMII_TSEC2,
+	SGMII_TSEC3,
+	SGMII_TSEC4,
+	XAUI_FM1,
+	XAUI_FM2,
+	AURORA,
+};
 
-#ifdef CONFIG_FSL_SERDES
-extern void fsl_setup_serdes(u32 offset, char proto, u32 rfcks, char vdd);
-#else
-static void fsl_setup_serdes(u32 offset, char proto, u32 rfcks, char vdd) {}
-#endif /* CONFIG_FSL_SERDES */
+int is_serdes_configured(enum srds_prtcl device);
 
 #endif /* __FSL_SERDES_H */