ide: add mvsata_ide driver

This driver only provides initialization code; actual driving
is done by cmd_ide.c using the ATA compatibility mode of the
Marvell SATAHC controller.

Signed-off-by: Albert Aribaud <albert.aribaud@free.fr>

1 files changed, 140 insertions, 0 deletions

diff --git a/drivers/block/mvsata_ide.c b/drivers/block/mvsata_ide.c
new file mode 100644
index 0000000..077b278
--- /dev/null
+++ b/drivers/block/mvsata_ide.c
@@ -0,0 +1,140 @@
+/*
+ * Copyright (C) 2010 Albert ARIBAUD <albert.aribaud@free.fr>
+ *
+ * Written-by: Albert ARIBAUD <albert.aribaud@free.fr>
+ *
+ * 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., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301 USA
+ */
+
+#include <common.h>
+#include <asm/io.h>
+
+#if defined(CONFIG_ORION5X)
+#include <asm/arch/orion5x.h>
+#elif defined(CONFIG_KIRKWOOD)
+#include <asm/arch/kirkwood.h>
+#endif
+
+/* SATA port registers */
+struct mvsata_port_registers {
+	u32 reserved1[192];
+	/* offset 0x300 : ATA Interface registers */
+	u32 sstatus;
+	u32 serror;
+	u32 scontrol;
+	u32 ltmode;
+	u32 phymode3;
+	u32 phymode4;
+	u32 reserved2[5];
+	u32 phymode1;
+	u32 phymode2;
+	u32 bist_cr;
+	u32 bist_dw1;
+	u32 bist_dw2;
+	u32 serrorintrmask;
+};
+
+/*
+ * Sanity checks:
+ * - to compile at all, we need CONFIG_SYS_ATA_BASE_ADDR.
+ * - for ide_preinit to make sense, we need at least one of
+ *   CONFIG_SYS_ATA_IDE0_OFFSET or CONFIG_SYS_ATA_IDE0_OFFSET;
+ * - for inde_preinit to be called, we need CONFIG_IDE_PREINIT.
+ * Fail with an explanation message if these conditions are not met.
+ * This is particularly important for CONFIG_IDE_PREINIT, because
+ * its lack would not cause a build error.
+ */
+
+#if !defined(CONFIG_SYS_ATA_BASE_ADDR)
+#error CONFIG_SYS_ATA_BASE_ADDR must be defined
+#elif !defined(CONFIG_SYS_ATA_IDE0_OFFSET) \
+   && !defined(CONFIG_SYS_ATA_IDE1_OFFSET)
+#error CONFIG_SYS_ATA_IDE0_OFFSET or CONFIG_SYS_ATA_IDE1_OFFSET \
+   must be defined
+#elif !defined(CONFIG_IDE_PREINIT)
+#error CONFIG_IDE_PREINIT must be defined
+#endif
+
+/*
+ * Masks and values for SControl DETection and Interface Power Management,
+ * and for SStatus DETection.
+ */
+
+#define MVSATA_SCONTROL_DET_MASK		0x0000000F
+#define MVSATA_SCONTROL_DET_NONE		0x00000000
+#define MVSATA_SCONTROL_DET_INIT		0x00000001
+#define MVSATA_SCONTROL_IPM_MASK		0x00000F00
+#define MVSATA_SCONTROL_IPM_NO_LP_ALLOWED	0x00000300
+#define MVSATA_SCONTROL_MASK \
+	(MVSATA_SCONTROL_DET_MASK|MVSATA_SCONTROL_IPM_MASK)
+#define MVSATA_PORT_INIT \
+	(MVSATA_SCONTROL_DET_INIT|MVSATA_SCONTROL_IPM_NO_LP_ALLOWED)
+#define MVSATA_PORT_USE \
+	(MVSATA_SCONTROL_DET_NONE|MVSATA_SCONTROL_IPM_NO_LP_ALLOWED)
+#define MVSATA_SSTATUS_DET_MASK			0x0000000F
+#define MVSATA_SSTATUS_DET_DEVCOMM		0x00000003
+
+/*
+ * Initialize one MVSATAHC port: set SControl's IPM to "always active"
+ * and DET to "reset", then wait for SStatus's DET to become "device and
+ * comm ok" (or time out after 50 us if no device), then set SControl's
+ * DET back to "no action".
+ */
+
+static void mvsata_ide_initialize_port(struct mvsata_port_registers *port)
+{
+	u32 control;
+	u32 status;
+	u32 tout = 50; /* wait at most 50 us for SATA reset to complete */
+
+	control = readl(&port->scontrol);
+	control = (control & ~MVSATA_SCONTROL_MASK) | MVSATA_PORT_INIT;
+	writel(control, &port->scontrol);
+	while (--tout) {
+		status = readl(&port->sstatus) & MVSATA_SSTATUS_DET_MASK;
+		if (status == MVSATA_SSTATUS_DET_DEVCOMM)
+			break;
+		udelay(1);
+	}
+	control = (control & ~MVSATA_SCONTROL_MASK) | MVSATA_PORT_USE;
+	writel(control, &port->scontrol);
+}
+
+/*
+ * ide_preinit() will be called by ide_init in cmd_ide.c and will
+ * reset the MVSTATHC ports needed by the board.
+ */
+
+int ide_preinit(void)
+{
+	/* Enable ATA port 0 (could be SATA port 0 or 1) if declared */
+#if defined(CONFIG_SYS_ATA_IDE0_OFFSET)
+	mvsata_ide_initialize_port(
+		(struct mvsata_port_registers *)
+		(CONFIG_SYS_ATA_BASE_ADDR + CONFIG_SYS_ATA_IDE0_OFFSET));
+#endif
+	/* Enable ATA port 1 (could be SATA port 0 or 1) if declared */
+#if defined(CONFIG_SYS_ATA_IDE1_OFFSET)
+	mvsata_ide_initialize_port(
+		(struct mvsata_port_registers *)
+		(CONFIG_SYS_ATA_BASE_ADDR + CONFIG_SYS_ATA_IDE1_OFFSET));
+#endif
+	/* return 0 as we always succeed */
+	return 0;
+}