memory: ti-aemif: Add DM support

The AEMIF's bindings in the Linux tree have a node for the AEMIF
controller and then a node for each AEMIF's chip select. This CS node
doesn't have a compatible property but describes the timing parameters
used by a given chip select.
The U-Boot DM framework expects every node to have a 'compatible'
property. If no 'compatible' is present in a node, its children won't be
parsed by u-boot.

Add DM support to the ti-aemif driver.
Add a new ti-aemif-cs driver to comply with the Linux bindings and the
U-Boot's DM philosophy. This driver handles the timing parameters
of an AEMIF's chip select so move aemif_cs_configure() from ti-aemif.c
to ti-aemif-cs.c.

Signed-off-by: Bastien Curutchet <bastien.curutchet@bootlin.com>

1 files changed, 61 insertions, 0 deletions

diff --git a/drivers/memory/ti-aemif-cs.c b/drivers/memory/ti-aemif-cs.c
new file mode 100644
index 00000000000..80166e3e6a2
--- /dev/null
+++ b/drivers/memory/ti-aemif-cs.c
@@ -0,0 +1,61 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * DaVinci / Keystone2 : AEMIF's chip select configuration
+ *
+ */
+#include <asm/io.h>
+#include <clk.h>
+#include <dm.h>
+#include "ti-aemif-cs.h"
+
+#define AEMIF_CONFIG(cs)		(0x10 + ((cs) * 4))
+
+#define AEMIF_CFG_SELECT_STROBE(v)	((v) ? 1 << 31 : 0)
+#define AEMIF_CFG_EXTEND_WAIT(v)	((v) ? 1 << 30 : 0)
+#define AEMIF_CFG_WR_SETUP(v)		(((v) & 0x0f) << 26)
+#define AEMIF_CFG_WR_STROBE(v)		(((v) & 0x3f) << 20)
+#define AEMIF_CFG_WR_HOLD(v)		(((v) & 0x07) << 17)
+#define AEMIF_CFG_RD_SETUP(v)		(((v) & 0x0f) << 13)
+#define AEMIF_CFG_RD_STROBE(v)		(((v) & 0x3f) << 7)
+#define AEMIF_CFG_RD_HOLD(v)		(((v) & 0x07) << 4)
+#define AEMIF_CFG_TURN_AROUND(v)	(((v) & 0x03) << 2)
+#define AEMIF_CFG_WIDTH(v)		(((v) & 0x03) << 0)
+
+#define set_config_field(reg, field, val)				\
+	do {								\
+		if ((val) != -1) {					\
+			(reg) &= ~AEMIF_CFG_##field(0xffffffff);	\
+			(reg) |=	AEMIF_CFG_##field((val));	\
+		}							\
+	} while (0)
+
+void aemif_cs_configure(int cs, struct aemif_config *cfg)
+{
+	unsigned long tmp;
+
+	tmp = __raw_readl(cfg->base + AEMIF_CONFIG(cs));
+
+	set_config_field(tmp, SELECT_STROBE,	cfg->select_strobe);
+	set_config_field(tmp, EXTEND_WAIT,	cfg->extend_wait);
+	set_config_field(tmp, WR_SETUP,		cfg->wr_setup);
+	set_config_field(tmp, WR_STROBE,	cfg->wr_strobe);
+	set_config_field(tmp, WR_HOLD,		cfg->wr_hold);
+	set_config_field(tmp, RD_SETUP,		cfg->rd_setup);
+	set_config_field(tmp, RD_STROBE,	cfg->rd_strobe);
+	set_config_field(tmp, RD_HOLD,		cfg->rd_hold);
+	set_config_field(tmp, TURN_AROUND,	cfg->turn_around);
+	set_config_field(tmp, WIDTH,		cfg->width);
+
+	__raw_writel(tmp, cfg->base + AEMIF_CONFIG(cs));
+}
+
+static const struct udevice_id aemif_cs_ids[] = {
+	{ .compatible = "ti,da850-aemif-cs", },
+	{},
+};
+
+U_BOOT_DRIVER(ti_aemif_cs) = {
+	.name = "ti_aemif_cs",
+	.id = UCLASS_MEMORY,
+	.of_match = aemif_cs_ids,
+};