clk: rmobile: Move preboot clock shutdown to the driver

The MSTP registers were poked in boards/renesas/rcar-common/common.c
in arch_preboot_os hook thus far to shut down the clock before Linux
takes over. With DM, this is no longer needed and we can do the same
in the clock driver .remove callback. This patch adds such a .remove
callback for R8A7795 and R8A7796.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>

1 files changed, 59 insertions, 0 deletions

diff --git a/drivers/clk/renesas/clk-rcar-gen3.c b/drivers/clk/renesas/clk-rcar-gen3.c
index c821bddc25..a3fb58b53b 100644
--- a/drivers/clk/renesas/clk-rcar-gen3.c
+++ b/drivers/clk/renesas/clk-rcar-gen3.c
@@ -1074,6 +1074,64 @@ static int gen3_clk_probe(struct udevice *dev)
 	return 0;
 }
 
+struct mstp_stop_table {
+	u32	dis;
+	u32	en;
+};
+
+static struct mstp_stop_table r8a7795_mstp_table[] = {
+	{ 0x00640800, 0x0 },	{ 0xF3EE9390, 0x0 },
+	{ 0x340FAFDC, 0x2040 },	{ 0xD80C7CDF, 0x400 },
+	{ 0x80000184, 0x180 },	{ 0x40BFFF46, 0x0 },
+	{ 0xE5FBEECF, 0x0 },	{ 0x39FFFF0E, 0x0 },
+	{ 0x01F19FF4, 0x0 },	{ 0xFFDFFFFF, 0x0 },
+	{ 0xFFFEFFE0, 0x0 },	{ 0x00000000, 0x0 },
+};
+
+static struct mstp_stop_table r8a7796_mstp_table[] = {
+	{ 0x00200000, 0x0 },	{ 0xFFFFFFFF, 0x0 },
+	{ 0x340E2FDC, 0x2040 },	{ 0xFFFFFFDF, 0x400 },
+	{ 0x80000184, 0x180 },	{ 0xC3FFFFFF, 0x0 },
+	{ 0xFFFFFFFF, 0x0 },	{ 0xFFFFFFFF, 0x0 },
+	{ 0x01F1FFF7, 0x0 },	{ 0xFFFFFFFE, 0x0 },
+	{ 0xFFFEFFE0, 0x0 },	{ 0x000000B7, 0x0 },
+};
+
+#define TSTR0		0x04
+#define TSTR0_STR0	BIT(0)
+
+static int gen3_clk_remove(struct udevice *dev)
+{
+	struct gen3_clk_priv *priv = dev_get_priv(dev);
+	enum gen3_clk_model model = dev_get_driver_data(dev);
+	struct mstp_stop_table *tbl;
+	unsigned int i, tbl_size;
+
+	switch (model) {
+	case CLK_R8A7795:
+		tbl = r8a7795_mstp_table;
+		tbl_size = ARRAY_SIZE(r8a7795_mstp_table);
+		break;
+	case CLK_R8A7796:
+		tbl = r8a7796_mstp_table;
+		tbl_size = ARRAY_SIZE(r8a7796_mstp_table);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	/* Stop TMU0 */
+	clrbits_le32(TMU_BASE + TSTR0, TSTR0_STR0);
+
+	/* Stop module clock */
+	for (i = 0; i < tbl_size; i++) {
+		clrsetbits_le32(priv->base + SMSTPCR(i), tbl[i].dis, tbl[i].en);
+		clrsetbits_le32(priv->base + RMSTPCR(i), tbl[i].dis, 0x0);
+	}
+
+	return 0;
+}
+
 static const struct udevice_id gen3_clk_ids[] = {
 	{ .compatible = "renesas,r8a7795-cpg-mssr", .data = CLK_R8A7795 },
 	{ .compatible = "renesas,r8a7796-cpg-mssr", .data = CLK_R8A7796 },
@@ -1087,4 +1145,5 @@ U_BOOT_DRIVER(clk_gen3) = {
 	.priv_auto_alloc_size = sizeof(struct gen3_clk_priv),
 	.ops		= &gen3_clk_ops,
 	.probe		= gen3_clk_probe,
+	.remove		= gen3_clk_remove,
 };