[v3 07/17] drivers: clk: Add memory clock driver for Intel N5X device
Siew Chin Lim
elly.siew.chin.lim at intel.com
Sun Jun 13 10:48:42 CEST 2021
Add memory clock manager driver for N5X. Provides memory clock
initialization and enable functions.
Signed-off-by: Siew Chin Lim <elly.siew.chin.lim at intel.com>
---
v3:
- Use BIT() and GENMASK() macro for all *MASK macro
v2:
- common.h need to be included before clock_manager.h
- For consistency, use small letter fo 0x0c and 0x1c in macros
---
drivers/clk/altera/Makefile | 1 +
drivers/clk/altera/clk-mem-n5x.c | 136 +++++++++++++++++++++++++++++++
drivers/clk/altera/clk-mem-n5x.h | 84 +++++++++++++++++++
3 files changed, 221 insertions(+)
create mode 100644 drivers/clk/altera/clk-mem-n5x.c
create mode 100644 drivers/clk/altera/clk-mem-n5x.h
diff --git a/drivers/clk/altera/Makefile b/drivers/clk/altera/Makefile
index 38cd730685..33db092918 100644
--- a/drivers/clk/altera/Makefile
+++ b/drivers/clk/altera/Makefile
@@ -6,3 +6,4 @@
obj-$(CONFIG_TARGET_SOCFPGA_AGILEX) += clk-agilex.o
obj-$(CONFIG_TARGET_SOCFPGA_ARRIA10) += clk-arria10.o
obj-$(CONFIG_TARGET_SOCFPGA_N5X) += clk-n5x.o
+obj-$(CONFIG_TARGET_SOCFPGA_N5X) += clk-mem-n5x.o
diff --git a/drivers/clk/altera/clk-mem-n5x.c b/drivers/clk/altera/clk-mem-n5x.c
new file mode 100644
index 0000000000..ca44998641
--- /dev/null
+++ b/drivers/clk/altera/clk-mem-n5x.c
@@ -0,0 +1,136 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2020-2021 Intel Corporation <www.intel.com>
+ */
+
+#include <common.h>
+#include <asm/arch/clock_manager.h>
+#include <asm/global_data.h>
+#include <asm/io.h>
+#include "clk-mem-n5x.h"
+#include <clk-uclass.h>
+#include <dm.h>
+#include <dm/lists.h>
+#include <dm/util.h>
+#include <dt-bindings/clock/n5x-clock.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+struct socfpga_mem_clk_plat {
+ void __iomem *regs;
+};
+
+void clk_mem_wait_for_lock(struct socfpga_mem_clk_plat *plat, u32 mask)
+{
+ u32 inter_val;
+ u32 retry = 0;
+
+ do {
+ inter_val = CM_REG_READL(plat, MEMCLKMGR_STAT) & mask;
+
+ /* Wait for stable lock */
+ if (inter_val == mask)
+ retry++;
+ else
+ retry = 0;
+
+ if (retry >= 10)
+ return;
+ } while (1);
+}
+
+/*
+ * function to write the bypass register which requires a poll of the
+ * busy bit
+ */
+void clk_mem_write_bypass_mempll(struct socfpga_mem_clk_plat *plat, u32 val)
+{
+ CM_REG_WRITEL(plat, val, MEMCLKMGR_MEMPLL_BYPASS);
+}
+
+/*
+ * Setup clocks while making no assumptions about previous state of the clocks.
+ */
+static void clk_mem_basic_init(struct udevice *dev,
+ const struct cm_config * const cfg)
+{
+ struct socfpga_mem_clk_plat *plat = dev_get_plat(dev);
+
+ if (!cfg)
+ return;
+
+ /* Put PLLs in bypass */
+ clk_mem_write_bypass_mempll(plat, MEMCLKMGR_BYPASS_MEMPLL_ALL);
+
+ /* Put PLLs in Reset */
+ CM_REG_SETBITS(plat, MEMCLKMGR_MEMPLL_PLLCTRL,
+ MEMCLKMGR_PLLCTRL_BYPASS_MASK);
+
+ /* setup mem PLL */
+ CM_REG_WRITEL(plat, cfg->mem_memdiv, MEMCLKMGR_MEMPLL_MEMDIV);
+ CM_REG_WRITEL(plat, cfg->mem_pllglob, MEMCLKMGR_MEMPLL_PLLGLOB);
+ CM_REG_WRITEL(plat, cfg->mem_plldiv, MEMCLKMGR_MEMPLL_PLLDIV);
+ CM_REG_WRITEL(plat, cfg->mem_plloutdiv, MEMCLKMGR_MEMPLL_PLLOUTDIV);
+
+ /* Take PLL out of reset and power up */
+ CM_REG_CLRBITS(plat, MEMCLKMGR_MEMPLL_PLLCTRL,
+ MEMCLKMGR_PLLCTRL_BYPASS_MASK);
+}
+
+static int socfpga_mem_clk_enable(struct clk *clk)
+{
+ const struct cm_config *cm_default_cfg = cm_get_default_config();
+ struct socfpga_mem_clk_plat *plat = dev_get_plat(clk->dev);
+
+ clk_mem_basic_init(clk->dev, cm_default_cfg);
+
+ clk_mem_wait_for_lock(plat, MEMCLKMGR_STAT_ALLPLL_LOCKED_MASK);
+
+ CM_REG_WRITEL(plat, CM_REG_READL(plat, MEMCLKMGR_MEMPLL_PLLGLOB) |
+ MEMCLKMGR_PLLGLOB_CLR_LOSTLOCK_BYPASS_MASK,
+ MEMCLKMGR_MEMPLL_PLLGLOB);
+
+ /* Take all PLLs out of bypass */
+ clk_mem_write_bypass_mempll(plat, 0);
+
+ /* Clear the loss of lock bits (write 1 to clear) */
+ CM_REG_CLRBITS(plat, MEMCLKMGR_INTRCLR,
+ MEMCLKMGR_INTER_MEMPLLLOST_MASK);
+
+ /* Take all ping pong counters out of reset */
+ CM_REG_CLRBITS(plat, MEMCLKMGR_MEMPLL_EXTCNTRST,
+ MEMCLKMGR_EXTCNTRST_ALLCNTRST);
+
+ return 0;
+}
+
+static int socfpga_mem_clk_of_to_plat(struct udevice *dev)
+{
+ struct socfpga_mem_clk_plat *plat = dev_get_plat(dev);
+ fdt_addr_t addr;
+
+ addr = devfdt_get_addr(dev);
+ if (addr == FDT_ADDR_T_NONE)
+ return -EINVAL;
+ plat->regs = (void __iomem *)addr;
+
+ return 0;
+}
+
+static struct clk_ops socfpga_mem_clk_ops = {
+ .enable = socfpga_mem_clk_enable
+};
+
+static const struct udevice_id socfpga_mem_clk_match[] = {
+ { .compatible = "intel,n5x-mem-clkmgr" },
+ {}
+};
+
+U_BOOT_DRIVER(socfpga_n5x_mem_clk) = {
+ .name = "mem-clk-n5x",
+ .id = UCLASS_CLK,
+ .of_match = socfpga_mem_clk_match,
+ .ops = &socfpga_mem_clk_ops,
+ .of_to_plat = socfpga_mem_clk_of_to_plat,
+ .plat_auto = sizeof(struct socfpga_mem_clk_plat),
+};
diff --git a/drivers/clk/altera/clk-mem-n5x.h b/drivers/clk/altera/clk-mem-n5x.h
new file mode 100644
index 0000000000..d000ae260c
--- /dev/null
+++ b/drivers/clk/altera/clk-mem-n5x.h
@@ -0,0 +1,84 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2020-2021 Intel Corporation <www.intel.com>
+ */
+
+#ifndef _CLK_MEM_N5X_
+#define _CLK_MEM_N5X_
+
+#ifndef __ASSEMBLY__
+#include <linux/bitops.h>
+#endif
+
+/* Clock Manager registers */
+#define MEMCLKMGR_STAT 4
+#define MEMCLKMGR_INTRGEN 8
+#define MEMCLKMGR_INTRMSK 0x0c
+#define MEMCLKMGR_INTRCLR 0x10
+#define MEMCLKMGR_INTRSTS 0x14
+#define MEMCLKMGR_INTRSTK 0x18
+#define MEMCLKMGR_INTRRAW 0x1c
+
+/* Memory Clock Manager PPL group registers */
+#define MEMCLKMGR_MEMPLL_EN 0x20
+#define MEMCLKMGR_MEMPLL_ENS 0x24
+#define MEMCLKMGR_MEMPLL_ENR 0x28
+#define MEMCLKMGR_MEMPLL_BYPASS 0x2c
+#define MEMCLKMGR_MEMPLL_BYPASSS 0x30
+#define MEMCLKMGR_MEMPLL_BYPASSR 0x34
+#define MEMCLKMGR_MEMPLL_MEMDIV 0x38
+#define MEMCLKMGR_MEMPLL_PLLGLOB 0x3c
+#define MEMCLKMGR_MEMPLL_PLLCTRL 0x40
+#define MEMCLKMGR_MEMPLL_PLLDIV 0x44
+#define MEMCLKMGR_MEMPLL_PLLOUTDIV 0x48
+#define MEMCLKMGR_MEMPLL_EXTCNTRST 0x4c
+
+#define MEMCLKMGR_CTRL_BOOTMODE BIT(0)
+
+#define MEMCLKMGR_STAT_MEMPLL_LOCKED BIT(8)
+
+#define MEMCLKMGR_STAT_ALLPLL_LOCKED_MASK \
+ (MEMCLKMGR_STAT_MEMPLL_LOCKED)
+
+#define MEMCLKMGR_INTER_MEMPLLLOCKED_MASK BIT(0)
+#define MEMCLKMGR_INTER_MEMPLLLOST_MASK BIT(2)
+
+#define MEMCLKMGR_BYPASS_MEMPLL_ALL 0x1
+
+#define MEMCLKMGR_MEMDIV_MPFEDIV_OFFSET 0
+#define MEMCLKMGR_MEMDIV_APBDIV_OFFSET 4
+#define MEMCLKMGR_MEMDIV_DFICTRLDIV_OFFSET 8
+#define MEMCLKMGR_MEMDIV_DFIDIV_OFFSET 12
+#define MEMCLKMGR_MEMDIV_DFICTRLDIV_MASK BIT(0)
+#define MEMCLKMGR_MEMDIV_DIVIDER_MASK GENMASK(1, 0)
+
+#define MEMCLKMGR_PLLGLOB_PSRC_MASK GENMASK(17, 16)
+#define MEMCLKMGR_PLLGLOB_PSRC_OFFSET 16
+#define MEMCLKMGR_PLLGLOB_LOSTLOCK_BYPASS_EN_MASK BIT(28)
+#define MEMCLKMGR_PLLGLOB_CLR_LOSTLOCK_BYPASS_MASK BIT(29)
+
+#define MEMCLKMGR_PSRC_EOSC1 0
+#define MEMCLKMGR_PSRC_INTOSC 1
+#define MEMCLKMGR_PSRC_F2S 2
+
+#define MEMCLKMGR_PLLCTRL_BYPASS_MASK BIT(0)
+#define MEMCLKMGR_PLLCTRL_RST_N_MASK BIT(1)
+
+#define MEMCLKMGR_PLLDIV_DIVR_MASK GENMASK(5, 0)
+#define MEMCLKMGR_PLLDIV_DIVF_MASK GENMASK(16, 8)
+#define MEMCLKMGR_PLLDIV_DIVQ_MASK GENMASK(26, 24)
+#define MEMCLKMGR_PLLDIV_RANGE_MASK GENMASK(30, 28)
+
+#define MEMCLKMGR_PLLDIV_DIVR_OFFSET 0
+#define MEMCLKMGR_PLLDIV_DIVF_OFFSET 8
+#define MEMCLKMGR_PLLDIV_DIVQ_QDIV_OFFSET 24
+#define MEMCLKMGR_PLLDIV_RANGE_OFFSET 28
+
+#define MEMCLKMGR_PLLOUTDIV_C0CNT_MASK GENMASK(4, 0)
+#define MEMCLKMGR_PLLOUTDIV_C0CNT_OFFSET 0
+
+#define MEMCLKMGR_EXTCNTRST_C0CNTRST BIT(7)
+#define MEMCLKMGR_EXTCNTRST_ALLCNTRST \
+ (MEMCLKMGR_EXTCNTRST_C0CNTRST)
+
+#endif /* _CLK_MEM_N5X_ */
--
2.19.0
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