[PATCH 6/7] arm: zynq: Migrate platform to clock controller
Soren Brinkmann
soren.brinkmann at xilinx.com
Tue Apr 30 19:58:03 EDT 2013
Migrate the Zynq platform and its drivers to use the new clock
controller driver.
Signed-off-by: Soren Brinkmann <soren.brinkmann at xilinx.com>
Cc: John Stultz <john.stultz at linaro.org>
Cc: Thomas Gleixner <tglx at linutronix.de>
Cc: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
Cc: Jiri Slaby <jslaby at suse.cz>
Cc: linux-serial at vger.kernel.org
---
arch/arm/boot/dts/zynq-7000.dtsi | 71 ++++++++-------------------
arch/arm/boot/dts/zynq-zc702.dts | 4 --
arch/arm/mach-zynq/slcr.c | 2 +-
drivers/clk/Makefile | 2 +-
drivers/clk/zynq/Makefile | 3 ++
drivers/clocksource/cadence_ttc_timer.c | 23 +++++++--
drivers/tty/serial/xilinx_uartps.c | 85 ++++++++++++++++++++++++++-------
include/linux/clk/zynq.h | 8 +++-
8 files changed, 118 insertions(+), 80 deletions(-)
create mode 100644 drivers/clk/zynq/Makefile
diff --git a/arch/arm/boot/dts/zynq-7000.dtsi b/arch/arm/boot/dts/zynq-7000.dtsi
index 2a1df1b..5337554 100644
--- a/arch/arm/boot/dts/zynq-7000.dtsi
+++ b/arch/arm/boot/dts/zynq-7000.dtsi
@@ -42,16 +42,18 @@
uart0: uart at e0000000 {
compatible = "xlnx,xuartps";
+ clocks = <&clkc 23>, <&clkc 40>;
+ clock-names = "ref_clk", "aper_clk";
reg = <0xE0000000 0x1000>;
interrupts = <0 27 4>;
- clocks = <&uart_clk 0>;
};
uart1: uart at e0001000 {
compatible = "xlnx,xuartps";
+ clocks = <&clkc 24>, <&clkc 41>;
+ clock-names = "ref_clk", "aper_clk";
reg = <0xE0001000 0x1000>;
interrupts = <0 50 4>;
- clocks = <&uart_clk 1>;
};
slcr: slcr at f8000000 {
@@ -62,50 +64,21 @@
#address-cells = <1>;
#size-cells = <0>;
- ps_clk: ps_clk {
- #clock-cells = <0>;
- compatible = "fixed-clock";
- /* clock-frequency set in board-specific file */
- clock-output-names = "ps_clk";
- };
- armpll: armpll {
- #clock-cells = <0>;
- compatible = "xlnx,zynq-pll";
- clocks = <&ps_clk>;
- reg = <0x100 0x110>;
- clock-output-names = "armpll";
- };
- ddrpll: ddrpll {
- #clock-cells = <0>;
- compatible = "xlnx,zynq-pll";
- clocks = <&ps_clk>;
- reg = <0x104 0x114>;
- clock-output-names = "ddrpll";
- };
- iopll: iopll {
- #clock-cells = <0>;
- compatible = "xlnx,zynq-pll";
- clocks = <&ps_clk>;
- reg = <0x108 0x118>;
- clock-output-names = "iopll";
- };
- uart_clk: uart_clk {
- #clock-cells = <1>;
- compatible = "xlnx,zynq-periph-clock";
- clocks = <&iopll &armpll &ddrpll>;
- reg = <0x154>;
- clock-output-names = "uart0_ref_clk",
- "uart1_ref_clk";
- };
- cpu_clk: cpu_clk {
+ clkc: clkc {
#clock-cells = <1>;
- compatible = "xlnx,zynq-cpu-clock";
- clocks = <&iopll &armpll &ddrpll>;
- reg = <0x120 0x1C4>;
- clock-output-names = "cpu_6x4x",
- "cpu_3x2x",
- "cpu_2x",
- "cpu_1x";
+ compatible = "xlnx,ps7-clkc";
+ ps-clk-frequency = <33333333>;
+ clock-output-names = "armpll", "ddrpll", "iopll", "cpu_6or4x",
+ "cpu_3or2x", "cpu_2x", "cpu_1x", "ddr2x", "ddr3x",
+ "dci", "lqspi", "smc", "pcap", "gem0", "gem1",
+ "fclk0", "fclk1", "fclk2", "fclk3", "can0", "can1",
+ "sdio0", "sdio1", "uart0", "uart1", "spi0", "spi1",
+ "dma", "usb0_aper", "usb1_aper", "gem0_aper",
+ "gem1_aper", "sdio0_aper", "sdio1_aper",
+ "spi0_aper", "spi1_aper", "can0_aper", "can1_aper",
+ "i2c0_aper", "i2c1_aper", "uart0_aper", "uart1_aper",
+ "gpio_aper", "lqspi_aper", "smc_aper", "swdt",
+ "dbg_trc", "dbg_apb";
};
};
};
@@ -114,9 +87,8 @@
interrupt-parent = <&intc>;
interrupts = < 0 10 4 0 11 4 0 12 4 >;
compatible = "cdns,ttc";
+ clocks = <&clkc 6>;
reg = <0xF8001000 0x1000>;
- clocks = <&cpu_clk 3>;
- clock-names = "cpu_1x";
clock-ranges;
};
@@ -124,9 +96,8 @@
interrupt-parent = <&intc>;
interrupts = < 0 37 4 0 38 4 0 39 4 >;
compatible = "cdns,ttc";
+ clocks = <&clkc 6>;
reg = <0xF8002000 0x1000>;
- clocks = <&cpu_clk 3>;
- clock-names = "cpu_1x";
clock-ranges;
};
scutimer: scutimer at f8f00600 {
@@ -134,7 +105,7 @@
interrupts = < 1 13 0x301 >;
compatible = "arm,cortex-a9-twd-timer";
reg = < 0xf8f00600 0x20 >;
- clocks = <&cpu_clk 1>;
+ clocks = <&clkc 4>;
} ;
};
};
diff --git a/arch/arm/boot/dts/zynq-zc702.dts b/arch/arm/boot/dts/zynq-zc702.dts
index 86f44d5..e25a307 100644
--- a/arch/arm/boot/dts/zynq-zc702.dts
+++ b/arch/arm/boot/dts/zynq-zc702.dts
@@ -28,7 +28,3 @@
};
};
-
-&ps_clk {
- clock-frequency = <33333330>;
-};
diff --git a/arch/arm/mach-zynq/slcr.c b/arch/arm/mach-zynq/slcr.c
index c70969b..50d008d 100644
--- a/arch/arm/mach-zynq/slcr.c
+++ b/arch/arm/mach-zynq/slcr.c
@@ -117,7 +117,7 @@ int __init zynq_slcr_init(void)
pr_info("%s mapped to %p\n", np->name, zynq_slcr_base);
- xilinx_zynq_clocks_init(zynq_slcr_base);
+ zynq_clock_init(zynq_slcr_base);
of_node_put(np);
diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index e7f7fe9..addfd02 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -27,7 +27,7 @@ obj-$(CONFIG_MACH_LOONGSON1) += clk-ls1x.o
obj-$(CONFIG_ARCH_SUNXI) += sunxi/
obj-$(CONFIG_ARCH_U8500) += ux500/
obj-$(CONFIG_ARCH_VT8500) += clk-vt8500.o
-obj-$(CONFIG_ARCH_ZYNQ) += clk-zynq.o
+obj-$(CONFIG_ARCH_ZYNQ) += zynq/
obj-$(CONFIG_ARCH_TEGRA) += tegra/
obj-$(CONFIG_X86) += x86/
diff --git a/drivers/clk/zynq/Makefile b/drivers/clk/zynq/Makefile
new file mode 100644
index 0000000..156d923
--- /dev/null
+++ b/drivers/clk/zynq/Makefile
@@ -0,0 +1,3 @@
+# Zynq clock specific Makefile
+
+obj-$(CONFIG_ARCH_ZYNQ) += clkc.o pll.o
diff --git a/drivers/clocksource/cadence_ttc_timer.c b/drivers/clocksource/cadence_ttc_timer.c
index ab8fc2c..6d961ad 100644
--- a/drivers/clocksource/cadence_ttc_timer.c
+++ b/drivers/clocksource/cadence_ttc_timer.c
@@ -51,6 +51,8 @@
#define TTC_CNT_CNTRL_DISABLE_MASK 0x1
+#define TTC_CLK_CNTRL_CSRC_MASK (1 << 5) /* clock source */
+
/*
* Setup the timers to use pre-scaling, using a fixed value for now that will
* work across most input frequency, but it may need to be more dynamic
@@ -396,8 +398,9 @@ static void __init ttc_timer_init(struct device_node *timer)
{
unsigned int irq;
void __iomem *timer_baseaddr;
- struct clk *clk;
+ struct clk *clk_cs, *clk_ce;
static int initialized;
+ int clksel;
if (initialized)
return;
@@ -421,14 +424,24 @@ static void __init ttc_timer_init(struct device_node *timer)
BUG();
}
- clk = of_clk_get_by_name(timer, "cpu_1x");
- if (IS_ERR(clk)) {
+ clksel = __raw_readl(timer_baseaddr + TTC_CLK_CNTRL_OFFSET);
+ clksel = !!(clksel & TTC_CLK_CNTRL_CSRC_MASK);
+ clk_cs = of_clk_get(timer, clksel);
+ if (IS_ERR(clk_cs)) {
+ pr_err("ERROR: timer input clock not found\n");
+ BUG();
+ }
+
+ clksel = __raw_readl(timer_baseaddr + 4 + TTC_CLK_CNTRL_OFFSET);
+ clksel = !!(clksel & TTC_CLK_CNTRL_CSRC_MASK);
+ clk_ce = of_clk_get(timer, clksel);
+ if (IS_ERR(clk_ce)) {
pr_err("ERROR: timer input clock not found\n");
BUG();
}
- ttc_setup_clocksource(clk, timer_baseaddr);
- ttc_setup_clockevent(clk, timer_baseaddr + 4, irq);
+ ttc_setup_clocksource(clk_cs, timer_baseaddr);
+ ttc_setup_clockevent(clk_ce, timer_baseaddr + 4, irq);
pr_info("%s #0 at %p, irq=%d\n", timer->name, timer_baseaddr, irq);
}
diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c
index 04a1f8f..d3fa947 100644
--- a/drivers/tty/serial/xilinx_uartps.c
+++ b/drivers/tty/serial/xilinx_uartps.c
@@ -20,6 +20,7 @@
#include <linux/platform_device.h>
#include <linux/serial.h>
#include <linux/serial_core.h>
+#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
@@ -139,6 +140,16 @@
#define XUARTPS_SR_RXTRIG 0x00000001 /* Rx Trigger */
/**
+ * struct xuartps - device data
+ * @refclk Reference clock
+ * @aperclk APB clock
+ */
+struct xuartps {
+ struct clk *refclk;
+ struct clk *aperclk;
+};
+
+/**
* xuartps_isr - Interrupt handler
* @irq: Irq number
* @dev_id: Id of the port
@@ -936,34 +947,55 @@ static int xuartps_probe(struct platform_device *pdev)
int rc;
struct uart_port *port;
struct resource *res, *res2;
- struct clk *clk;
+ struct xuartps *xuartps_data;
- clk = of_clk_get(pdev->dev.of_node, 0);
- if (IS_ERR(clk)) {
- dev_err(&pdev->dev, "no clock specified\n");
- return PTR_ERR(clk);
+ xuartps_data = kzalloc(sizeof(*xuartps_data), GFP_KERNEL);
+ if (!xuartps_data)
+ return -ENOMEM;
+
+ xuartps_data->aperclk = clk_get(&pdev->dev, "aper_clk");
+ if (IS_ERR(xuartps_data->aperclk)) {
+ dev_err(&pdev->dev, "aper_clk clock not found.\n");
+ rc = PTR_ERR(xuartps_data->aperclk);
+ goto err_out_free;
+ }
+ xuartps_data->refclk = clk_get(&pdev->dev, "ref_clk");
+ if (IS_ERR(xuartps_data->refclk)) {
+ dev_err(&pdev->dev, "ref_clk clock not found.\n");
+ rc = PTR_ERR(xuartps_data->refclk);
+ goto err_out_clk_put_aper;
}
- rc = clk_prepare_enable(clk);
+ rc = clk_prepare_enable(xuartps_data->aperclk);
+ if (rc) {
+ dev_err(&pdev->dev, "Unable to enable APER clock.\n");
+ goto err_out_clk_put;
+ }
+ rc = clk_prepare_enable(xuartps_data->refclk);
if (rc) {
- dev_err(&pdev->dev, "could not enable clock\n");
- return -EBUSY;
+ dev_err(&pdev->dev, "Unable to enable device clock.\n");
+ goto err_out_clk_dis_aper;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!res)
- return -ENODEV;
+ if (!res) {
+ rc = -ENODEV;
+ goto err_out_clk_disable;
+ }
res2 = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
- if (!res2)
- return -ENODEV;
+ if (!res2) {
+ rc = -ENODEV;
+ goto err_out_clk_disable;
+ }
/* Initialize the port structure */
port = xuartps_get_port();
if (!port) {
dev_err(&pdev->dev, "Cannot get uart_port structure\n");
- return -ENODEV;
+ rc = -ENODEV;
+ goto err_out_clk_disable;
} else {
/* Register the port.
* This function also registers this device with the tty layer
@@ -972,18 +1004,31 @@ static int xuartps_probe(struct platform_device *pdev)
port->mapbase = res->start;
port->irq = res2->start;
port->dev = &pdev->dev;
- port->uartclk = clk_get_rate(clk);
- port->private_data = clk;
+ port->uartclk = clk_get_rate(xuartps_data->refclk);
+ port->private_data = xuartps_data;
dev_set_drvdata(&pdev->dev, port);
rc = uart_add_one_port(&xuartps_uart_driver, port);
if (rc) {
dev_err(&pdev->dev,
"uart_add_one_port() failed; err=%i\n", rc);
dev_set_drvdata(&pdev->dev, NULL);
- return rc;
+ goto err_out_clk_disable;
}
return 0;
}
+
+err_out_clk_disable:
+ clk_disable_unprepare(xuartps_data->refclk);
+err_out_clk_dis_aper:
+ clk_disable_unprepare(xuartps_data->aperclk);
+err_out_clk_put:
+ clk_put(xuartps_data->refclk);
+err_out_clk_put_aper:
+ clk_put(xuartps_data->aperclk);
+err_out_free:
+ kfree(xuartps_data);
+
+ return rc;
}
/**
@@ -995,14 +1040,18 @@ static int xuartps_probe(struct platform_device *pdev)
static int xuartps_remove(struct platform_device *pdev)
{
struct uart_port *port = dev_get_drvdata(&pdev->dev);
- struct clk *clk = port->private_data;
+ struct xuartps *xuartps_data = port->private_data;
int rc;
/* Remove the xuartps port from the serial core */
rc = uart_remove_one_port(&xuartps_uart_driver, port);
dev_set_drvdata(&pdev->dev, NULL);
port->mapbase = 0;
- clk_disable_unprepare(clk);
+ clk_disable_unprepare(xuartps_data->refclk);
+ clk_disable_unprepare(xuartps_data->aperclk);
+ clk_put(xuartps_data->refclk);
+ clk_put(xuartps_data->aperclk);
+ kfree(xuartps_data);
return rc;
}
diff --git a/include/linux/clk/zynq.h b/include/linux/clk/zynq.h
index 56be7cd..e062d31 100644
--- a/include/linux/clk/zynq.h
+++ b/include/linux/clk/zynq.h
@@ -1,4 +1,5 @@
/*
+ * Copyright (C) 2013 Xilinx Inc.
* Copyright (C) 2012 National Instruments
*
* This program is free software; you can redistribute it and/or modify
@@ -19,6 +20,11 @@
#ifndef __LINUX_CLK_ZYNQ_H_
#define __LINUX_CLK_ZYNQ_H_
-void __init xilinx_zynq_clocks_init(void __iomem *slcr);
+#include <linux/spinlock.h>
+void zynq_clock_init(void __iomem *slcr);
+
+struct clk *clk_register_zynq_pll(const char *name, const char *parent,
+ void __iomem *pll_ctrl, void __iomem *pll_status, u8 lock_index,
+ spinlock_t *lock);
#endif
--
1.8.2.2
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