Merge tag 'u-boot-atmel-2021.01-a' of https://gitlab.denx.de/u-boot/custodians/u-boot-atmel into next

First set of u-boot-atmel features for 2021.01 cycle:

This feature set includes a new CPU driver for at91 family, new driver
for PIT64B hardware timer, support for new at91 family SoC named sama7g5
which adds: clock support, including conversion of the clock tree to
CCF; SoC support in mach-at91, pinctrl and mmc drivers update.  The
feature set also includes updates for mmc driver and some other minor
fixes and features regarding building without the old Atmel PIT and the
possibility to read a secondary MAC address from a second i2c EEPROM.

1 files changed, 202 insertions, 0 deletions

diff --git a/drivers/clk/at91/clk-generic.c b/drivers/clk/at91/clk-generic.c
new file mode 100644
index 00000000000..87738b7b5bf
--- /dev/null
+++ b/drivers/clk/at91/clk-generic.c
@@ -0,0 +1,202 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Generic clock support for AT91 architectures.
+ *
+ * Copyright (C) 2020 Microchip Technology Inc. and its subsidiaries
+ *
+ * Author: Claudiu Beznea <claudiu.beznea@microchip.com>
+ *
+ * Based on drivers/clk/at91/clk-generated.c from Linux.
+ */
+#include <common.h>
+#include <clk-uclass.h>
+#include <dm.h>
+#include <linux/io.h>
+#include <linux/clk-provider.h>
+#include <linux/clk/at91_pmc.h>
+
+#include "pmc.h"
+
+#define UBOOT_DM_CLK_AT91_GCK		"at91-gck-clk"
+
+#define GENERATED_MAX_DIV	255
+
+struct clk_gck {
+	void __iomem *base;
+	const u32 *clk_mux_table;
+	const u32 *mux_table;
+	const struct clk_pcr_layout *layout;
+	struct clk_range range;
+	struct clk clk;
+	u32 num_parents;
+	u32 id;
+};
+
+#define to_clk_gck(_c) container_of(_c, struct clk_gck, clk)
+
+static int clk_gck_enable(struct clk *clk)
+{
+	struct clk_gck *gck = to_clk_gck(clk);
+
+	pmc_write(gck->base, gck->layout->offset,
+		  (gck->id & gck->layout->pid_mask));
+	pmc_update_bits(gck->base, gck->layout->offset,
+			gck->layout->cmd | AT91_PMC_PCR_GCKEN,
+			gck->layout->cmd | AT91_PMC_PCR_GCKEN);
+
+	return 0;
+}
+
+static int clk_gck_disable(struct clk *clk)
+{
+	struct clk_gck *gck = to_clk_gck(clk);
+
+	pmc_write(gck->base, gck->layout->offset,
+		  (gck->id & gck->layout->pid_mask));
+	pmc_update_bits(gck->base, gck->layout->offset,
+			gck->layout->cmd | AT91_PMC_PCR_GCKEN,
+			gck->layout->cmd);
+
+	return 0;
+}
+
+static int clk_gck_set_parent(struct clk *clk, struct clk *parent)
+{
+	struct clk_gck *gck = to_clk_gck(clk);
+	int index;
+
+	index = at91_clk_mux_val_to_index(gck->clk_mux_table, gck->num_parents,
+					  parent->id);
+	if (index < 0)
+		return index;
+
+	index = at91_clk_mux_index_to_val(gck->mux_table, gck->num_parents,
+					  index);
+	if (index < 0)
+		return index;
+
+	pmc_write(gck->base, gck->layout->offset,
+		  (gck->id & gck->layout->pid_mask));
+	pmc_update_bits(gck->base, gck->layout->offset,
+			gck->layout->gckcss_mask | gck->layout->cmd,
+			(index << (ffs(gck->layout->gckcss_mask) - 1)) |
+			gck->layout->cmd);
+
+	return 0;
+}
+
+static ulong clk_gck_set_rate(struct clk *clk, ulong rate)
+{
+	struct clk_gck *gck = to_clk_gck(clk);
+	ulong parent_rate = clk_get_parent_rate(clk);
+	u32 div;
+
+	if (!rate || !parent_rate)
+		return 0;
+
+	if (gck->range.max && rate > gck->range.max)
+		return 0;
+
+	div = DIV_ROUND_CLOSEST(parent_rate, rate);
+	if (div > GENERATED_MAX_DIV + 1 || !div)
+		return 0;
+
+	pmc_write(gck->base, gck->layout->offset,
+		  (gck->id & gck->layout->pid_mask));
+	pmc_update_bits(gck->base, gck->layout->offset,
+			AT91_PMC_PCR_GCKDIV_MASK | gck->layout->cmd,
+			((div - 1) << (ffs(AT91_PMC_PCR_GCKDIV_MASK) - 1)) |
+			gck->layout->cmd);
+
+	return parent_rate / div;
+}
+
+static ulong clk_gck_get_rate(struct clk *clk)
+{
+	struct clk_gck *gck = to_clk_gck(clk);
+	ulong parent_rate = clk_get_parent_rate(clk);
+	u32 val, div;
+
+	if (!parent_rate)
+		return 0;
+
+	pmc_write(gck->base, gck->layout->offset,
+		  (gck->id & gck->layout->pid_mask));
+	pmc_read(gck->base, gck->layout->offset, &val);
+
+	div = (val & AT91_PMC_PCR_GCKDIV_MASK) >>
+		(ffs(AT91_PMC_PCR_GCKDIV_MASK) - 1);
+
+	return parent_rate / (div + 1);
+}
+
+static const struct clk_ops gck_ops = {
+	.enable = clk_gck_enable,
+	.disable = clk_gck_disable,
+	.set_parent = clk_gck_set_parent,
+	.set_rate = clk_gck_set_rate,
+	.get_rate = clk_gck_get_rate,
+};
+
+struct clk *
+at91_clk_register_generic(void __iomem *base,
+			  const struct clk_pcr_layout *layout,
+			  const char *name, const char * const *parent_names,
+			  const u32 *clk_mux_table, const u32 *mux_table,
+			  u8 num_parents, u8 id,
+			  const struct clk_range *range)
+{
+	struct clk_gck *gck;
+	struct clk *clk;
+	int ret, index;
+	u32 val;
+
+	if (!base || !layout || !name || !parent_names || !num_parents ||
+	    !clk_mux_table || !mux_table || !range)
+		return ERR_PTR(-EINVAL);
+
+	gck = kzalloc(sizeof(*gck), GFP_KERNEL);
+	if (!gck)
+		return ERR_PTR(-ENOMEM);
+
+	gck->id = id;
+	gck->base = base;
+	gck->range = *range;
+	gck->layout = layout;
+	gck->clk_mux_table = clk_mux_table;
+	gck->mux_table = mux_table;
+	gck->num_parents = num_parents;
+
+	clk = &gck->clk;
+	clk->flags = CLK_GET_RATE_NOCACHE;
+
+	pmc_write(gck->base, gck->layout->offset,
+		  (gck->id & gck->layout->pid_mask));
+	pmc_read(gck->base, gck->layout->offset, &val);
+
+	val = (val & gck->layout->gckcss_mask) >>
+		(ffs(gck->layout->gckcss_mask) - 1);
+
+	index = at91_clk_mux_val_to_index(gck->mux_table, gck->num_parents,
+					  val);
+	if (index < 0) {
+		kfree(gck);
+		return ERR_PTR(index);
+	}
+
+	ret = clk_register(clk, UBOOT_DM_CLK_AT91_GCK, name,
+			   parent_names[index]);
+	if (ret) {
+		kfree(gck);
+		clk = ERR_PTR(ret);
+	}
+
+	return clk;
+}
+
+U_BOOT_DRIVER(at91_gck_clk) = {
+	.name = UBOOT_DM_CLK_AT91_GCK,
+	.id = UCLASS_CLK,
+	.ops = &gck_ops,
+	.flags = DM_FLAG_PRE_RELOC,
+};