[PATCH v2 18/21] clk: at91: clk-peripheral: add driver compatible with ccf
Claudiu Beznea
claudiu.beznea at microchip.com
Wed Aug 5 17:12:02 CEST 2020
Add clk-peripheral compatible with common clock framework.
Signed-off-by: Claudiu Beznea <claudiu.beznea at microchip.com>
---
drivers/clk/at91/Makefile | 2 +
drivers/clk/at91/clk-peripheral.c | 254 ++++++++++++++++++++++++++++++++++++++
drivers/clk/at91/pmc.h | 16 +++
3 files changed, 272 insertions(+)
create mode 100644 drivers/clk/at91/clk-peripheral.c
diff --git a/drivers/clk/at91/Makefile b/drivers/clk/at91/Makefile
index 1d59531e0c42..b5529065b5c4 100644
--- a/drivers/clk/at91/Makefile
+++ b/drivers/clk/at91/Makefile
@@ -4,6 +4,8 @@
ifdef CONFIG_CLK_CCF
obj-y += pmc.o sckc.o clk-main.o clk-master.o clk-programmable.o clk-system.o
+obj-y += clk-peripheral.o
+
obj-$(CONFIG_AT91_UTMI) += clk-utmi.o
obj-$(CONFIG_AT91_SAM9X60_PLL) += clk-sam9x60-pll.o
else
diff --git a/drivers/clk/at91/clk-peripheral.c b/drivers/clk/at91/clk-peripheral.c
new file mode 100644
index 000000000000..52cbc520cef4
--- /dev/null
+++ b/drivers/clk/at91/clk-peripheral.c
@@ -0,0 +1,254 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Peripheral clock support for AT91 architectures.
+ *
+ * Copyright (C) 2020 Microchip Technology Inc. and its subsidiaries
+ *
+ * Author: Claudiu Beznea <claudiu.beznea at microchip.com>
+ *
+ * Based on drivers/clk/at91/clk-peripheral.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_PERIPH "at91-periph-clk"
+#define UBOOT_DM_CLK_AT91_SAM9X5_PERIPH "at91-sam9x5-periph-clk"
+
+#define PERIPHERAL_ID_MIN 2
+#define PERIPHERAL_ID_MAX 31
+#define PERIPHERAL_MASK(id) (1 << ((id) & PERIPHERAL_ID_MAX))
+
+#define PERIPHERAL_MAX_SHIFT 3
+
+struct clk_peripheral {
+ void __iomem *base;
+ struct clk clk;
+ u32 id;
+};
+
+#define to_clk_peripheral(_c) container_of(_c, struct clk_peripheral, clk)
+
+struct clk_sam9x5_peripheral {
+ const struct clk_pcr_layout *layout;
+ void __iomem *base;
+ struct clk clk;
+ struct clk_range range;
+ u32 id;
+ u32 div;
+ bool auto_div;
+};
+
+#define to_clk_sam9x5_peripheral(_c) \
+ container_of(_c, struct clk_sam9x5_peripheral, clk)
+
+static int clk_peripheral_enable(struct clk *clk)
+{
+ struct clk_peripheral *periph = to_clk_peripheral(clk);
+ int offset = AT91_PMC_PCER;
+ u32 id = periph->id;
+
+ if (id < PERIPHERAL_ID_MIN)
+ return 0;
+ if (id > PERIPHERAL_ID_MAX)
+ offset = AT91_PMC_PCER1;
+ pmc_write(periph->base, offset, PERIPHERAL_MASK(id));
+
+ return 0;
+}
+
+static int clk_peripheral_disable(struct clk *clk)
+{
+ struct clk_peripheral *periph = to_clk_peripheral(clk);
+ int offset = AT91_PMC_PCDR;
+ u32 id = periph->id;
+
+ if (id < PERIPHERAL_ID_MIN)
+ return -EINVAL;
+
+ if (id > PERIPHERAL_ID_MAX)
+ offset = AT91_PMC_PCDR1;
+ pmc_write(periph->base, offset, PERIPHERAL_MASK(id));
+
+ return 0;
+}
+
+static const struct clk_ops peripheral_ops = {
+ .enable = clk_peripheral_enable,
+ .disable = clk_peripheral_disable,
+ .get_rate = clk_generic_get_rate,
+};
+
+struct clk *
+at91_clk_register_peripheral(void __iomem *base, const char *name,
+ const char *parent_name, u32 id)
+{
+ struct clk_peripheral *periph;
+ struct clk *clk;
+ int ret;
+
+ if (!base || !name || !parent_name || id > PERIPHERAL_ID_MAX)
+ return ERR_PTR(-EINVAL);
+
+ periph = kzalloc(sizeof(*periph), GFP_KERNEL);
+ if (!periph)
+ return ERR_PTR(-ENOMEM);
+
+ periph->id = id;
+ periph->base = base;
+
+ clk = &periph->clk;
+ clk->flags = CLK_GET_RATE_NOCACHE;
+ ret = clk_register(clk, UBOOT_DM_CLK_AT91_PERIPH, name, parent_name);
+ if (ret) {
+ kfree(periph);
+ clk = ERR_PTR(ret);
+ }
+
+ return clk;
+}
+
+U_BOOT_DRIVER(at91_periph_clk) = {
+ .name = UBOOT_DM_CLK_AT91_PERIPH,
+ .id = UCLASS_CLK,
+ .ops = &peripheral_ops,
+ .flags = DM_FLAG_PRE_RELOC,
+};
+
+static int clk_sam9x5_peripheral_enable(struct clk *clk)
+{
+ struct clk_sam9x5_peripheral *periph = to_clk_sam9x5_peripheral(clk);
+
+ if (periph->id < PERIPHERAL_ID_MIN)
+ return 0;
+
+ pmc_write(periph->base, periph->layout->offset,
+ (periph->id & periph->layout->pid_mask));
+ pmc_update_bits(periph->base, periph->layout->offset,
+ periph->layout->cmd | AT91_PMC_PCR_EN,
+ periph->layout->cmd | AT91_PMC_PCR_EN);
+
+ return 0;
+}
+
+static int clk_sam9x5_peripheral_disable(struct clk *clk)
+{
+ struct clk_sam9x5_peripheral *periph = to_clk_sam9x5_peripheral(clk);
+
+ if (periph->id < PERIPHERAL_ID_MIN)
+ return -EINVAL;
+
+ pmc_write(periph->base, periph->layout->offset,
+ (periph->id & periph->layout->pid_mask));
+ pmc_update_bits(periph->base, periph->layout->offset,
+ AT91_PMC_PCR_EN | periph->layout->cmd,
+ periph->layout->cmd);
+
+ return 0;
+}
+
+static ulong clk_sam9x5_peripheral_get_rate(struct clk *clk)
+{
+ struct clk_sam9x5_peripheral *periph = to_clk_sam9x5_peripheral(clk);
+ ulong parent_rate = clk_get_parent_rate(clk);
+ u32 val, shift = ffs(periph->layout->div_mask) - 1;
+
+ if (!parent_rate)
+ return 0;
+
+ pmc_write(periph->base, periph->layout->offset,
+ (periph->id & periph->layout->pid_mask));
+ pmc_read(periph->base, periph->layout->offset, &val);
+ shift = (val & periph->layout->div_mask) >> shift;
+
+ return parent_rate >> shift;
+}
+
+static ulong clk_sam9x5_peripheral_set_rate(struct clk *clk, ulong rate)
+{
+ struct clk_sam9x5_peripheral *periph = to_clk_sam9x5_peripheral(clk);
+ ulong parent_rate = clk_get_parent_rate(clk);
+ int shift;
+
+ if (!parent_rate)
+ return 0;
+
+ if (periph->id < PERIPHERAL_ID_MIN || !periph->range.max) {
+ if (parent_rate == rate)
+ return rate;
+ else
+ return 0;
+ }
+
+ if (periph->range.max && rate > periph->range.max)
+ return 0;
+
+ for (shift = 0; shift <= PERIPHERAL_MAX_SHIFT; shift++) {
+ if (parent_rate >> shift <= rate)
+ break;
+ }
+ if (shift == PERIPHERAL_MAX_SHIFT + 1)
+ return 0;
+
+ pmc_write(periph->base, periph->layout->offset,
+ (periph->id & periph->layout->pid_mask));
+ pmc_update_bits(periph->base, periph->layout->offset,
+ periph->layout->div_mask | periph->layout->cmd,
+ (shift << (ffs(periph->layout->div_mask) - 1)) |
+ periph->layout->cmd);
+
+ return parent_rate >> shift;
+}
+
+static const struct clk_ops sam9x5_peripheral_ops = {
+ .enable = clk_sam9x5_peripheral_enable,
+ .disable = clk_sam9x5_peripheral_disable,
+ .get_rate = clk_sam9x5_peripheral_get_rate,
+ .set_rate = clk_sam9x5_peripheral_set_rate,
+};
+
+struct clk *
+at91_clk_register_sam9x5_peripheral(void __iomem *base,
+ const struct clk_pcr_layout *layout,
+ const char *name, const char *parent_name,
+ u32 id, const struct clk_range *range)
+{
+ struct clk_sam9x5_peripheral *periph;
+ struct clk *clk;
+ int ret;
+
+ if (!base || !layout || !name || !parent_name || !range)
+ return ERR_PTR(-EINVAL);
+
+ periph = kzalloc(sizeof(*periph), GFP_KERNEL);
+ if (!periph)
+ return ERR_PTR(-ENOMEM);
+
+ periph->id = id;
+ periph->base = base;
+ periph->layout = layout;
+ periph->range = *range;
+
+ clk = &periph->clk;
+ clk->flags = CLK_GET_RATE_NOCACHE;
+ ret = clk_register(clk, UBOOT_DM_CLK_AT91_SAM9X5_PERIPH, name,
+ parent_name);
+ if (ret) {
+ kfree(periph);
+ clk = ERR_PTR(ret);
+ }
+
+ return clk;
+}
+
+U_BOOT_DRIVER(at91_sam9x5_periph_clk) = {
+ .name = UBOOT_DM_CLK_AT91_SAM9X5_PERIPH,
+ .id = UCLASS_CLK,
+ .ops = &sam9x5_peripheral_ops,
+ .flags = DM_FLAG_PRE_RELOC,
+};
diff --git a/drivers/clk/at91/pmc.h b/drivers/clk/at91/pmc.h
index c372f39fc9f6..5e80f353e6c2 100644
--- a/drivers/clk/at91/pmc.h
+++ b/drivers/clk/at91/pmc.h
@@ -63,6 +63,14 @@ struct clk_programmable_layout {
u8 is_pres_direct;
};
+struct clk_pcr_layout {
+ u32 offset;
+ u32 cmd;
+ u32 div_mask;
+ u32 gckcss_mask;
+ u32 pid_mask;
+};
+
extern const struct clk_programmable_layout at91rm9200_programmable_layout;
extern const struct clk_programmable_layout at91sam9g45_programmable_layout;
extern const struct clk_programmable_layout at91sam9x5_programmable_layout;
@@ -111,6 +119,14 @@ at91_clk_register_programmable(void __iomem *base, const char *name,
struct clk *
at91_clk_register_system(void __iomem *base, const char *name,
const char *parent_name, u8 id);
+struct clk *
+at91_clk_register_peripheral(void __iomem *base, const char *name,
+ const char *parent_name, u32 id);
+struct clk *
+at91_clk_register_sam9x5_peripheral(void __iomem *base,
+ const struct clk_pcr_layout *layout,
+ const char *name, const char *parent_name,
+ u32 id, const struct clk_range *range);
int at91_clk_mux_val_to_index(const u32 *table, u32 num_parents, u32 val);
int at91_clk_mux_index_to_val(const u32 *table, u32 num_parents, u32 index);
--
2.7.4
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