[U-Boot] [PATCH v2 1/4] clk: sifive: Add clock driver for GEMGXL MGMT
Bin Meng
bmeng.cn at gmail.com
Wed May 22 07:09:44 UTC 2019
This adds a clock driver to support the GEMGXL management IP block
found in FU540 SoCs to control GEM TX clock operation mode for
10/100/1000 Mbps.
Signed-off-by: Bin Meng <bmeng.cn at gmail.com>
Reviewed-by: Lukas Auer <lukas.auer at aisec.fraunhofer.de>
Tested-by: Lukas Auer <lukas.auer at aisec.fraunhofer.de>
---
Changes in v2:
- rename driver name to "sifive-gemgxl-mgmt"
drivers/clk/sifive/Kconfig | 7 +++++
drivers/clk/sifive/Makefile | 2 ++
drivers/clk/sifive/gemgxl-mgmt.c | 60 ++++++++++++++++++++++++++++++++++++++++
3 files changed, 69 insertions(+)
create mode 100644 drivers/clk/sifive/gemgxl-mgmt.c
diff --git a/drivers/clk/sifive/Kconfig b/drivers/clk/sifive/Kconfig
index 81fc9f8..644881b 100644
--- a/drivers/clk/sifive/Kconfig
+++ b/drivers/clk/sifive/Kconfig
@@ -17,3 +17,10 @@ config CLK_SIFIVE_FU540_PRCI
Supports the Power Reset Clock interface (PRCI) IP block found in
FU540 SoCs. If this kernel is meant to run on a SiFive FU540 SoC,
enable this driver.
+
+config CLK_SIFIVE_GEMGXL_MGMT
+ bool "GEMGXL management for SiFive FU540 SoCs"
+ depends on CLK_SIFIVE
+ help
+ Supports the GEMGXL management IP block found in FU540 SoCs to
+ control GEM TX clock operation mode for 10/100/1000 Mbps.
diff --git a/drivers/clk/sifive/Makefile b/drivers/clk/sifive/Makefile
index 1155e07..f8263e7 100644
--- a/drivers/clk/sifive/Makefile
+++ b/drivers/clk/sifive/Makefile
@@ -3,3 +3,5 @@
obj-$(CONFIG_CLK_ANALOGBITS_WRPLL_CLN28HPC) += wrpll-cln28hpc.o
obj-$(CONFIG_CLK_SIFIVE_FU540_PRCI) += fu540-prci.o
+
+obj-$(CONFIG_CLK_SIFIVE_GEMGXL_MGMT) += gemgxl-mgmt.o
diff --git a/drivers/clk/sifive/gemgxl-mgmt.c b/drivers/clk/sifive/gemgxl-mgmt.c
new file mode 100644
index 0000000..eb37416
--- /dev/null
+++ b/drivers/clk/sifive/gemgxl-mgmt.c
@@ -0,0 +1,60 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2019, Bin Meng <bmeng.cn at gmail.com>
+ */
+
+#include <common.h>
+#include <clk-uclass.h>
+#include <dm.h>
+#include <asm/io.h>
+
+struct gemgxl_mgmt_regs {
+ __u32 tx_clk_sel;
+};
+
+struct gemgxl_mgmt_platdata {
+ struct gemgxl_mgmt_regs *regs;
+};
+
+static int gemgxl_mgmt_ofdata_to_platdata(struct udevice *dev)
+{
+ struct gemgxl_mgmt_platdata *plat = dev_get_platdata(dev);
+
+ plat->regs = (struct gemgxl_mgmt_regs *)dev_read_addr(dev);
+
+ return 0;
+}
+
+static ulong gemgxl_mgmt_set_rate(struct clk *clk, ulong rate)
+{
+ struct gemgxl_mgmt_platdata *plat = dev_get_platdata(clk->dev);
+
+ /*
+ * GEMGXL TX clock operation mode:
+ *
+ * 0 = GMII mode. Use 125 MHz gemgxlclk from PRCI in TX logic
+ * and output clock on GMII output signal GTX_CLK
+ * 1 = MII mode. Use MII input signal TX_CLK in TX logic
+ */
+ writel(rate != 125000000, &plat->regs->tx_clk_sel);
+
+ return 0;
+}
+
+const struct clk_ops gemgxl_mgmt_ops = {
+ .set_rate = gemgxl_mgmt_set_rate,
+};
+
+static const struct udevice_id gemgxl_mgmt_match[] = {
+ { .compatible = "sifive,cadencegemgxlmgmt0", },
+ { /* sentinel */ }
+};
+
+U_BOOT_DRIVER(sifive_gemgxl_mgmt) = {
+ .name = "sifive-gemgxl-mgmt",
+ .id = UCLASS_CLK,
+ .of_match = gemgxl_mgmt_match,
+ .ofdata_to_platdata = gemgxl_mgmt_ofdata_to_platdata,
+ .platdata_auto_alloc_size = sizeof(struct gemgxl_mgmt_platdata),
+ .ops = &gemgxl_mgmt_ops,
+};
--
2.7.4
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