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-rw-r--r--Documentation/devicetree/bindings/clock/zynq-7000.txt55
-rw-r--r--arch/arm/Kconfig2
-rw-r--r--arch/arm/Kconfig.debug17
-rw-r--r--arch/arm/Makefile1
-rw-r--r--arch/arm/boot/dts/Makefile1
-rw-r--r--arch/arm/boot/dts/zynq-7000.dtsi166
-rw-r--r--arch/arm/boot/dts/zynq-ep107.dts52
-rw-r--r--arch/arm/boot/dts/zynq-zc702.dts44
-rw-r--r--arch/arm/mach-zynq/common.c54
-rw-r--r--arch/arm/mach-zynq/common.h4
-rw-r--r--arch/arm/mach-zynq/include/mach/clkdev.h32
-rw-r--r--arch/arm/mach-zynq/include/mach/zynq_soc.h45
-rw-r--r--arch/arm/mach-zynq/timer.c297
-rw-r--r--drivers/clk/Makefile1
-rw-r--r--drivers/clk/clk-zynq.c383
-rw-r--r--include/linux/clk/zynq.h24
16 files changed, 922 insertions, 256 deletions
diff --git a/Documentation/devicetree/bindings/clock/zynq-7000.txt b/Documentation/devicetree/bindings/clock/zynq-7000.txt
new file mode 100644
index 000000000000..23ae1db1bc13
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/zynq-7000.txt
@@ -0,0 +1,55 @@
+Device Tree Clock bindings for the Zynq 7000 EPP
+
+The Zynq EPP has several different clk providers, each with there own bindings.
+The purpose of this document is to document their usage.
+
+See clock_bindings.txt for more information on the generic clock bindings.
+See Chapter 25 of Zynq TRM for more information about Zynq clocks.
+
+== PLLs ==
+
+Used to describe the ARM_PLL, DDR_PLL, and IO_PLL.
+
+Required properties:
+- #clock-cells : shall be 0 (only one clock is output from this node)
+- compatible : "xlnx,zynq-pll"
+- reg : pair of u32 values, which are the address offsets within the SLCR
+ of the relevant PLL_CTRL register and PLL_CFG register respectively
+- clocks : phandle for parent clock. should be the phandle for ps_clk
+
+Optional properties:
+- clock-output-names : name of the output clock
+
+Example:
+ armpll: armpll {
+ #clock-cells = <0>;
+ compatible = "xlnx,zynq-pll";
+ clocks = <&ps_clk>;
+ reg = <0x100 0x110>;
+ clock-output-names = "armpll";
+ };
+
+== Peripheral clocks ==
+
+Describes clock node for the SDIO, SMC, SPI, QSPI, and UART clocks.
+
+Required properties:
+- #clock-cells : shall be 1
+- compatible : "xlnx,zynq-periph-clock"
+- reg : a single u32 value, describing the offset within the SLCR where
+ the CLK_CTRL register is found for this peripheral
+- clocks : phandle for parent clocks. should hold phandles for
+ the IO_PLL, ARM_PLL, and DDR_PLL in order
+- clock-output-names : names of the output clock(s). For peripherals that have
+ two output clocks (for example, the UART), two clocks
+ should be listed.
+
+Example:
+ 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";
+ };
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index d33dc606f7ec..23252783e93f 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -945,7 +945,7 @@ config ARCH_ZYNQ
bool "Xilinx Zynq ARM Cortex A9 Platform"
select ARM_AMBA
select ARM_GIC
- select CLKDEV_LOOKUP
+ select COMMON_CLK
select CPU_V7
select GENERIC_CLOCKEVENTS
select ICST
diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug
index 5566520686a5..5bbfcf0d35e0 100644
--- a/arch/arm/Kconfig.debug
+++ b/arch/arm/Kconfig.debug
@@ -132,6 +132,23 @@ choice
their output to UART1 serial port on DaVinci TNETV107X
devices.
+ config DEBUG_ZYNQ_UART0
+ bool "Kernel low-level debugging on Xilinx Zynq using UART0"
+ depends on ARCH_ZYNQ
+ help
+ Say Y here if you want the debug print routines to direct
+ their output to UART0 on the Zynq platform.
+
+ config DEBUG_ZYNQ_UART1
+ bool "Kernel low-level debugging on Xilinx Zynq using UART1"
+ depends on ARCH_ZYNQ
+ help
+ Say Y here if you want the debug print routines to direct
+ their output to UART1 on the Zynq platform.
+
+ If you have a ZC702 board and want early boot messages to
+ appear on the USB serial adaptor, select this option.
+
config DEBUG_DC21285_PORT
bool "Kernel low-level debugging messages via footbridge serial port"
depends on FOOTBRIDGE
diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index 3353b7613208..97252d86a701 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -198,7 +198,6 @@ machine-$(CONFIG_ARCH_ZYNQ) += zynq
# by CONFIG_* macro name.
plat-$(CONFIG_ARCH_OMAP) += omap
plat-$(CONFIG_ARCH_S3C64XX) += samsung
-plat-$(CONFIG_ARCH_ZYNQ) += versatile
plat-$(CONFIG_PLAT_IOP) += iop
plat-$(CONFIG_PLAT_NOMADIK) += nomadik
plat-$(CONFIG_PLAT_ORION) += orion
diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
index 2458b69e2be6..23b178389eb7 100644
--- a/arch/arm/boot/dts/Makefile
+++ b/arch/arm/boot/dts/Makefile
@@ -105,5 +105,6 @@ dtb-$(CONFIG_ARCH_VEXPRESS) += vexpress-v2p-ca5s.dtb \
dtb-$(CONFIG_ARCH_VT8500) += vt8500-bv07.dtb \
wm8505-ref.dtb \
wm8650-mid.dtb
+dtb-$(CONFIG_ARCH_ZYNQ) += zynq-zc702.dtb
endif
diff --git a/arch/arm/boot/dts/zynq-7000.dtsi b/arch/arm/boot/dts/zynq-7000.dtsi
new file mode 100644
index 000000000000..401c1262d4ed
--- /dev/null
+++ b/arch/arm/boot/dts/zynq-7000.dtsi
@@ -0,0 +1,166 @@
+/*
+ * Copyright (C) 2011 Xilinx
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+/include/ "skeleton.dtsi"
+
+/ {
+ compatible = "xlnx,zynq-7000";
+
+ amba {
+ compatible = "simple-bus";
+ #address-cells = <1>;
+ #size-cells = <1>;
+ interrupt-parent = <&intc>;
+ ranges;
+
+ intc: interrupt-controller@f8f01000 {
+ compatible = "arm,cortex-a9-gic";
+ #interrupt-cells = <3>;
+ #address-cells = <1>;
+ interrupt-controller;
+ reg = <0xF8F01000 0x1000>,
+ <0xF8F00100 0x100>;
+ };
+
+ L2: cache-controller {
+ compatible = "arm,pl310-cache";
+ reg = <0xF8F02000 0x1000>;
+ arm,data-latency = <2 3 2>;
+ arm,tag-latency = <2 3 2>;
+ cache-unified;
+ cache-level = <2>;
+ };
+
+ uart0: uart@e0000000 {
+ compatible = "xlnx,xuartps";
+ reg = <0xE0000000 0x1000>;
+ interrupts = <0 27 4>;
+ clock = <50000000>;
+ };
+
+ uart1: uart@e0001000 {
+ compatible = "xlnx,xuartps";
+ reg = <0xE0001000 0x1000>;
+ interrupts = <0 50 4>;
+ clock = <50000000>;
+ };
+
+ slcr: slcr@f8000000 {
+ compatible = "xlnx,zynq-slcr";
+ reg = <0xF8000000 0x1000>;
+
+ clocks {
+ #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 {
+ #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";
+ };
+ };
+ };
+
+ ttc0: ttc0@f8001000 {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ compatible = "xlnx,ttc";
+ reg = <0xF8001000 0x1000>;
+ clocks = <&cpu_clk 3>;
+ clock-names = "cpu_1x";
+ clock-ranges;
+
+ ttc0_0: ttc0.0 {
+ status = "disabled";
+ reg = <0>;
+ interrupts = <0 10 4>;
+ };
+ ttc0_1: ttc0.1 {
+ status = "disabled";
+ reg = <1>;
+ interrupts = <0 11 4>;
+ };
+ ttc0_2: ttc0.2 {
+ status = "disabled";
+ reg = <2>;
+ interrupts = <0 12 4>;
+ };
+ };
+
+ ttc1: ttc1@f8002000 {
+ #interrupt-parent = <&intc>;
+ #address-cells = <1>;
+ #size-cells = <0>;
+ compatible = "xlnx,ttc";
+ reg = <0xF8002000 0x1000>;
+ clocks = <&cpu_clk 3>;
+ clock-names = "cpu_1x";
+ clock-ranges;
+
+ ttc1_0: ttc1.0 {
+ status = "disabled";
+ reg = <0>;
+ interrupts = <0 37 4>;
+ };
+ ttc1_1: ttc1.1 {
+ status = "disabled";
+ reg = <1>;
+ interrupts = <0 38 4>;
+ };
+ ttc1_2: ttc1.2 {
+ status = "disabled";
+ reg = <2>;
+ interrupts = <0 39 4>;
+ };
+ };
+ };
+};
diff --git a/arch/arm/boot/dts/zynq-ep107.dts b/arch/arm/boot/dts/zynq-ep107.dts
deleted file mode 100644
index 37ca192fb193..000000000000
--- a/arch/arm/boot/dts/zynq-ep107.dts
+++ /dev/null
@@ -1,52 +0,0 @@
-/*
- * Copyright (C) 2011 Xilinx
- *
- * This software is licensed under the terms of the GNU General Public
- * License version 2, as published by the Free Software Foundation, and
- * may be copied, distributed, and modified under those terms.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- */
-
-/dts-v1/;
-/ {
- model = "Xilinx Zynq EP107";
- compatible = "xlnx,zynq-ep107";
- #address-cells = <1>;
- #size-cells = <1>;
- interrupt-parent = <&intc>;
-
- memory {
- device_type = "memory";
- reg = <0x0 0x10000000>;
- };
-
- chosen {
- bootargs = "console=ttyPS0,9600 root=/dev/ram rw initrd=0x800000,8M earlyprintk";
- linux,stdout-path = &uart0;
- };
-
- amba {
- compatible = "simple-bus";
- #address-cells = <1>;
- #size-cells = <1>;
- ranges;
-
- intc: interrupt-controller@f8f01000 {
- interrupt-controller;
- compatible = "arm,gic";
- reg = <0xF8F01000 0x1000>;
- #interrupt-cells = <2>;
- };
-
- uart0: uart@e0000000 {
- compatible = "xlnx,xuartps";
- reg = <0xE0000000 0x1000>;
- interrupts = <59 0>;
- clock = <50000000>;
- };
- };
-};
diff --git a/arch/arm/boot/dts/zynq-zc702.dts b/arch/arm/boot/dts/zynq-zc702.dts
new file mode 100644
index 000000000000..c772942a399a
--- /dev/null
+++ b/arch/arm/boot/dts/zynq-zc702.dts
@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2011 Xilinx
+ * Copyright (C) 2012 National Instruments Corp.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+/dts-v1/;
+/include/ "zynq-7000.dtsi"
+
+/ {
+ model = "Zynq ZC702 Development Board";
+ compatible = "xlnx,zynq-zc702", "xlnx,zynq-7000";
+
+ memory {
+ device_type = "memory";
+ reg = <0x0 0x40000000>;
+ };
+
+ chosen {
+ bootargs = "console=ttyPS1,115200 earlyprintk";
+ };
+
+};
+
+&ps_clk {
+ clock-frequency = <33333330>;
+};
+
+&ttc0_0 {
+ status = "ok";
+ compatible = "xlnx,ttc-counter-clocksource";
+};
+
+&ttc0_1 {
+ status = "ok";
+ compatible = "xlnx,ttc-counter-clockevent";
+};
diff --git a/arch/arm/mach-zynq/common.c b/arch/arm/mach-zynq/common.c
index ab5cfddc0d7b..79bf5fb4dad3 100644
--- a/arch/arm/mach-zynq/common.c
+++ b/arch/arm/mach-zynq/common.c
@@ -19,19 +19,21 @@
#include <linux/cpumask.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
+#include <linux/clk/zynq.h>
+#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <linux/of.h>
#include <asm/mach/arch.h>
#include <asm/mach/map.h>
+#include <asm/mach/time.h>
#include <asm/mach-types.h>
#include <asm/page.h>
#include <asm/hardware/gic.h>
#include <asm/hardware/cache-l2x0.h>
#include <mach/zynq_soc.h>
-#include <mach/clkdev.h>
#include "common.h"
static struct of_device_id zynq_of_bus_ids[] __initdata = {
@@ -45,22 +47,25 @@ static struct of_device_id zynq_of_bus_ids[] __initdata = {
*/
static void __init xilinx_init_machine(void)
{
-#ifdef CONFIG_CACHE_L2X0
/*
* 64KB way size, 8-way associativity, parity disabled
*/
- l2x0_init(PL310_L2CC_BASE, 0x02060000, 0xF0F0FFFF);
-#endif
+ l2x0_of_init(0x02060000, 0xF0F0FFFF);
of_platform_bus_probe(NULL, zynq_of_bus_ids, NULL);
}
+static struct of_device_id irq_match[] __initdata = {
+ { .compatible = "arm,cortex-a9-gic", .data = gic_of_init, },
+ { }
+};
+
/**
* xilinx_irq_init() - Interrupt controller initialization for the GIC.
*/
static void __init xilinx_irq_init(void)
{
- gic_init(0, 29, SCU_GIC_DIST_BASE, SCU_GIC_CPU_BASE);
+ of_irq_init(irq_match);
}
/* The minimum devices needed to be mapped before the VM system is up and
@@ -71,31 +76,47 @@ static struct map_desc io_desc[] __initdata = {
{
.virtual = TTC0_VIRT,
.pfn = __phys_to_pfn(TTC0_PHYS),
- .length = SZ_4K,
+ .length = TTC0_SIZE,
.type = MT_DEVICE,
}, {
.virtual = SCU_PERIPH_VIRT,
.pfn = __phys_to_pfn(SCU_PERIPH_PHYS),
- .length = SZ_8K,
- .type = MT_DEVICE,
- }, {
- .virtual = PL310_L2CC_VIRT,
- .pfn = __phys_to_pfn(PL310_L2CC_PHYS),
- .length = SZ_4K,
+ .length = SCU_PERIPH_SIZE,
.type = MT_DEVICE,
},
#ifdef CONFIG_DEBUG_LL
{
- .virtual = UART0_VIRT,
- .pfn = __phys_to_pfn(UART0_PHYS),
- .length = SZ_4K,
+ .virtual = LL_UART_VADDR,
+ .pfn = __phys_to_pfn(LL_UART_PADDR),
+ .length = UART_SIZE,
.type = MT_DEVICE,
},
#endif
};
+static void __init xilinx_zynq_timer_init(void)
+{
+ struct device_node *np;
+ void __iomem *slcr;
+
+ np = of_find_compatible_node(NULL, NULL, "xlnx,zynq-slcr");
+ slcr = of_iomap(np, 0);
+ WARN_ON(!slcr);
+
+ xilinx_zynq_clocks_init(slcr);
+
+ xttcpss_timer_init();
+}
+
+/*
+ * Instantiate and initialize the system timer structure
+ */
+static struct sys_timer xttcpss_sys_timer = {
+ .init = xilinx_zynq_timer_init,
+};
+
/**
* xilinx_map_io() - Create memory mappings needed for early I/O.
*/
@@ -105,7 +126,8 @@ static void __init xilinx_map_io(void)
}
static const char *xilinx_dt_match[] = {
- "xlnx,zynq-ep107",
+ "xlnx,zynq-zc702",
+ "xlnx,zynq-7000",
NULL
};
diff --git a/arch/arm/mach-zynq/common.h b/arch/arm/mach-zynq/common.h
index a009644a1555..954b91c13c91 100644
--- a/arch/arm/mach-zynq/common.h
+++ b/arch/arm/mach-zynq/common.h
@@ -17,8 +17,6 @@
#ifndef __MACH_ZYNQ_COMMON_H__
#define __MACH_ZYNQ_COMMON_H__
-#include <asm/mach/time.h>
-
-extern struct sys_timer xttcpss_sys_timer;
+void __init xttcpss_timer_init(void);
#endif
diff --git a/arch/arm/mach-zynq/include/mach/clkdev.h b/arch/arm/mach-zynq/include/mach/clkdev.h
deleted file mode 100644
index c6e73d81a459..000000000000
--- a/arch/arm/mach-zynq/include/mach/clkdev.h
+++ /dev/null
@@ -1,32 +0,0 @@
-/*
- * arch/arm/mach-zynq/include/mach/clkdev.h
- *
- * Copyright (C) 2011 Xilinx, Inc.
- *
- * This software is licensed under the terms of the GNU General Public
- * License version 2, as published by the Free Software Foundation, and
- * may be copied, distributed, and modified under those terms.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- */
-
-#ifndef __MACH_CLKDEV_H__
-#define __MACH_CLKDEV_H__
-
-#include <plat/clock.h>
-
-struct clk {
- unsigned long rate;
- const struct clk_ops *ops;
- const struct icst_params *params;
- void __iomem *vcoreg;
-};
-
-#define __clk_get(clk) ({ 1; })
-#define __clk_put(clk) do { } while (0)
-
-#endif
diff --git a/arch/arm/mach-zynq/include/mach/zynq_soc.h b/arch/arm/mach-zynq/include/mach/zynq_soc.h
index d0d3f8fb06dd..5ebbd8e6eeee 100644
--- a/arch/arm/mach-zynq/include/mach/zynq_soc.h
+++ b/arch/arm/mach-zynq/include/mach/zynq_soc.h
@@ -15,34 +15,39 @@
#ifndef __MACH_XILINX_SOC_H__
#define __MACH_XILINX_SOC_H__
+#include <asm/pgtable.h>
+
#define PERIPHERAL_CLOCK_RATE 2500000
-/* For now, all mappings are flat (physical = virtual)
+/* Static peripheral mappings are mapped at the top of the vmalloc region. The
+ * early uart mapping causes intermediate problems/failure at certain
+ * addresses, including the very top of the vmalloc region. Map it at an
+ * address that is known to work.
*/
-#define UART0_PHYS 0xE0000000
-#define UART0_VIRT UART0_PHYS
-
-#define TTC0_PHYS 0xF8001000
-#define TTC0_VIRT TTC0_PHYS
-
-#define PL310_L2CC_PHYS 0xF8F02000
-#define PL310_L2CC_VIRT PL310_L2CC_PHYS
+#define UART0_PHYS 0xE0000000
+#define UART1_PHYS 0xE0001000
+#define UART_SIZE SZ_4K
+#define UART_VIRT 0xF0001000
+
+#define TTC0_PHYS 0xF8001000
+#define TTC0_SIZE SZ_4K
+#define TTC0_VIRT (VMALLOC_END - TTC0_SIZE)
+
+#define SCU_PERIPH_PHYS 0xF8F00000
+#define SCU_PERIPH_SIZE SZ_8K
+#define SCU_PERIPH_VIRT (TTC0_VIRT - SCU_PERIPH_SIZE)
+
+#if IS_ENABLED(CONFIG_DEBUG_ZYNQ_UART1)
+# define LL_UART_PADDR UART1_PHYS
+#else
+# define LL_UART_PADDR UART0_PHYS
+#endif
-#define SCU_PERIPH_PHYS 0xF8F00000
-#define SCU_PERIPH_VIRT SCU_PERIPH_PHYS
+#define LL_UART_VADDR UART_VIRT
/* The following are intended for the devices that are mapped early */
#define TTC0_BASE IOMEM(TTC0_VIRT)
#define SCU_PERIPH_BASE IOMEM(SCU_PERIPH_VIRT)
-#define SCU_GIC_CPU_BASE (SCU_PERIPH_BASE + 0x100)
-#define SCU_GIC_DIST_BASE (SCU_PERIPH_BASE + 0x1000)
-#define PL310_L2CC_BASE IOMEM(PL310_L2CC_VIRT)
-
-/*
- * Mandatory for CONFIG_LL_DEBUG, UART is mapped virtual = physical
- */
-#define LL_UART_PADDR UART0_PHYS
-#define LL_UART_VADDR UART0_VIRT
#endif
diff --git a/arch/arm/mach-zynq/timer.c b/arch/arm/mach-zynq/timer.c
index c2c96cc7d6e7..9662306aa12f 100644
--- a/arch/arm/mach-zynq/timer.c
+++ b/arch/arm/mach-zynq/timer.c
@@ -23,32 +23,15 @@
#include <linux/clocksource.h>
#include <linux/clockchips.h>
#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/slab.h>
+#include <linux/clk-provider.h>
-#include <asm/mach/time.h>
#include <mach/zynq_soc.h>
#include "common.h"
-#define IRQ_TIMERCOUNTER0 42
-
-/*
- * This driver configures the 2 16-bit count-up timers as follows:
- *
- * T1: Timer 1, clocksource for generic timekeeping
- * T2: Timer 2, clockevent source for hrtimers
- * T3: Timer 3, <unused>
- *
- * The input frequency to the timer module for emulation is 2.5MHz which is
- * common to all the timer channels (T1, T2, and T3). With a pre-scaler of 32,
- * the timers are clocked at 78.125KHz (12.8 us resolution).
- *
- * The input frequency to the timer module in silicon will be 200MHz. With the
- * pre-scaler of 32, the timers are clocked at 6.25MHz (160ns resolution).
- */
-#define XTTCPSS_CLOCKSOURCE 0 /* Timer 1 as a generic timekeeping */
-#define XTTCPSS_CLOCKEVENT 1 /* Timer 2 as a clock event */
-
-#define XTTCPSS_TIMER_BASE TTC0_BASE
-#define XTTCPCC_EVENT_TIMER_IRQ (IRQ_TIMERCOUNTER0 + 1)
/*
* Timer Register Offset Definitions of Timer 1, Increment base address by 4
* and use same offsets for Timer 2
@@ -65,9 +48,14 @@
#define XTTCPSS_CNT_CNTRL_DISABLE_MASK 0x1
-/* Setup the timers to use pre-scaling */
-
-#define TIMER_RATE (PERIPHERAL_CLOCK_RATE / 32)
+/* 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
+ */
+#define PRESCALE_EXPONENT 11 /* 2 ^ PRESCALE_EXPONENT = PRESCALE */
+#define PRESCALE 2048 /* The exponent must match this */
+#define CLK_CNTRL_PRESCALE ((PRESCALE_EXPONENT - 1) << 1)
+#define CLK_CNTRL_PRESCALE_EN 1
+#define CNT_CNTRL_RESET (1<<4)
/**
* struct xttcpss_timer - This definition defines local timer structure
@@ -75,11 +63,25 @@
* @base_addr: Base address of timer
**/
struct xttcpss_timer {
- void __iomem *base_addr;
+ void __iomem *base_addr;
};
-static struct xttcpss_timer timers[2];
-static struct clock_event_device xttcpss_clockevent;
+struct xttcpss_timer_clocksource {
+ struct xttcpss_timer xttc;
+ struct clocksource cs;
+};
+
+#define to_xttcpss_timer_clksrc(x) \
+ container_of(x, struct xttcpss_timer_clocksource, cs)
+
+struct xttcpss_timer_clockevent {
+ struct xttcpss_timer xttc;
+ struct clock_event_device ce;
+ struct clk *clk;
+};
+
+#define to_xttcpss_timer_clkevent(x) \
+ container_of(x, struct xttcpss_timer_clockevent, ce)
/**
* xttcpss_set_interval - Set the timer interval value
@@ -101,7 +103,7 @@ static void xttcpss_set_interval(struct xttcpss_timer *timer,
/* Reset the counter (0x10) so that it starts from 0, one-shot
mode makes this needed for timing to be right. */
- ctrl_reg |= 0x10;
+ ctrl_reg |= CNT_CNTRL_RESET;
ctrl_reg &= ~XTTCPSS_CNT_CNTRL_DISABLE_MASK;
__raw_writel(ctrl_reg, timer->base_addr + XTTCPSS_CNT_CNTRL_OFFSET);
}
@@ -116,90 +118,31 @@ static void xttcpss_set_interval(struct xttcpss_timer *timer,
**/
static irqreturn_t xttcpss_clock_event_interrupt(int irq, void *dev_id)
{
- struct clock_event_device *evt = &xttcpss_clockevent;
- struct xttcpss_timer *timer = dev_id;
+ struct xttcpss_timer_clockevent *xttce = dev_id;
+ struct xttcpss_timer *timer = &xttce->xttc;
/* Acknowledge the interrupt and call event handler */
__raw_writel(__raw_readl(timer->base_addr + XTTCPSS_ISR_OFFSET),
timer->base_addr + XTTCPSS_ISR_OFFSET);
- evt->event_handler(evt);
+ xttce->ce.event_handler(&xttce->ce);
return IRQ_HANDLED;
}
-static struct irqaction event_timer_irq = {
- .name = "xttcpss clockevent",
- .flags = IRQF_DISABLED | IRQF_TIMER,
- .handler = xttcpss_clock_event_interrupt,
-};
-
/**
- * xttcpss_timer_hardware_init - Initialize the timer hardware
- *
- * Initialize the hardware to start the clock source, get the clock
- * event timer ready to use, and hook up the interrupt.
- **/
-static void __init xttcpss_timer_hardware_init(void)
-{
- /* Setup the clock source counter to be an incrementing counter
- * with no interrupt and it rolls over at 0xFFFF. Pre-scale
- it by 32 also. Let it start running now.
- */
- timers[XTTCPSS_CLOCKSOURCE].base_addr = XTTCPSS_TIMER_BASE;
-
- __raw_writel(0x0, timers[XTTCPSS_CLOCKSOURCE].base_addr +
- XTTCPSS_IER_OFFSET);
- __raw_writel(0x9, timers[XTTCPSS_CLOCKSOURCE].base_addr +
- XTTCPSS_CLK_CNTRL_OFFSET);
- __raw_writel(0x10, timers[XTTCPSS_CLOCKSOURCE].base_addr +
- XTTCPSS_CNT_CNTRL_OFFSET);
-
- /* Setup the clock event timer to be an interval timer which
- * is prescaled by 32 using the interval interrupt. Leave it
- * disabled for now.
- */
-
- timers[XTTCPSS_CLOCKEVENT].base_addr = XTTCPSS_TIMER_BASE + 4;
-
- __raw_writel(0x23, timers[XTTCPSS_CLOCKEVENT].base_addr +
- XTTCPSS_CNT_CNTRL_OFFSET);
- __raw_writel(0x9, timers[XTTCPSS_CLOCKEVENT].base_addr +
- XTTCPSS_CLK_CNTRL_OFFSET);
- __raw_writel(0x1, timers[XTTCPSS_CLOCKEVENT].base_addr +
- XTTCPSS_IER_OFFSET);
-
- /* Setup IRQ the clock event timer */
- event_timer_irq.dev_id = &timers[XTTCPSS_CLOCKEVENT];
- setup_irq(XTTCPCC_EVENT_TIMER_IRQ, &event_timer_irq);
-}
-
-/**
- * __raw_readl_cycles - Reads the timer counter register
+ * __xttc_clocksource_read - Reads the timer counter register
*
* returns: Current timer counter register value
**/
-static cycle_t __raw_readl_cycles(struct clocksource *cs)
+static cycle_t __xttc_clocksource_read(struct clocksource *cs)
{
- struct xttcpss_timer *timer = &timers[XTTCPSS_CLOCKSOURCE];
+ struct xttcpss_timer *timer = &to_xttcpss_timer_clksrc(cs)->xttc;
return (cycle_t)__raw_readl(timer->base_addr +
XTTCPSS_COUNT_VAL_OFFSET);
}
-
-/*
- * Instantiate and initialize the clock source structure
- */
-static struct clocksource clocksource_xttcpss = {
- .name = "xttcpss_timer1",
- .rating = 200, /* Reasonable clock source */
- .read = __raw_readl_cycles,
- .mask = CLOCKSOURCE_MASK(16),
- .flags = CLOCK_SOURCE_IS_CONTINUOUS,
-};
-
-
/**
* xttcpss_set_next_event - Sets the time interval for next event
*
@@ -211,7 +154,8 @@ static struct clocksource clocksource_xttcpss = {
static int xttcpss_set_next_event(unsigned long cycles,
struct clock_event_device *evt)
{
- struct xttcpss_timer *timer = &timers[XTTCPSS_CLOCKEVENT];
+ struct xttcpss_timer_clockevent *xttce = to_xttcpss_timer_clkevent(evt);
+ struct xttcpss_timer *timer = &xttce->xttc;
xttcpss_set_interval(timer, cycles);
return 0;
@@ -226,12 +170,15 @@ static int xttcpss_set_next_event(unsigned long cycles,
static void xttcpss_set_mode(enum clock_event_mode mode,
struct clock_event_device *evt)
{
- struct xttcpss_timer *timer = &timers[XTTCPSS_CLOCKEVENT];
+ struct xttcpss_timer_clockevent *xttce = to_xttcpss_timer_clkevent(evt);
+ struct xttcpss_timer *timer = &xttce->xttc;
u32 ctrl_reg;
switch (mode) {
case CLOCK_EVT_MODE_PERIODIC:
- xttcpss_set_interval(timer, TIMER_RATE / HZ);
+ xttcpss_set_interval(timer,
+ DIV_ROUND_CLOSEST(clk_get_rate(xttce->clk),
+ PRESCALE * HZ));
break;
case CLOCK_EVT_MODE_ONESHOT:
case CLOCK_EVT_MODE_UNUSED:
@@ -252,15 +199,106 @@ static void xttcpss_set_mode(enum clock_event_mode mode,
}
}
-/*
- * Instantiate and initialize the clock event structure
- */
-static struct clock_event_device xttcpss_clockevent = {
- .name = "xttcpss_timer2",
- .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
- .set_next_event = xttcpss_set_next_event,
- .set_mode = xttcpss_set_mode,
- .rating = 200,
+static void __init zynq_ttc_setup_clocksource(struct device_node *np,
+ void __iomem *base)
+{
+ struct xttcpss_timer_clocksource *ttccs;
+ struct clk *clk;
+ int err;
+ u32 reg;
+
+ ttccs = kzalloc(sizeof(*ttccs), GFP_KERNEL);
+ if (WARN_ON(!ttccs))
+ return;
+
+ err = of_property_read_u32(np, "reg", &reg);
+ if (WARN_ON(err))
+ return;
+
+ clk = of_clk_get_by_name(np, "cpu_1x");
+ if (WARN_ON(IS_ERR(clk)))
+ return;
+
+ err = clk_prepare_enable(clk);
+ if (WARN_ON(err))
+ return;
+
+ ttccs->xttc.base_addr = base + reg * 4;
+
+ ttccs->cs.name = np->name;
+ ttccs->cs.rating = 200;
+ ttccs->cs.read = __xttc_clocksource_read;
+ ttccs->cs.mask = CLOCKSOURCE_MASK(16);
+ ttccs->cs.flags = CLOCK_SOURCE_IS_CONTINUOUS;
+
+ __raw_writel(0x0, ttccs->xttc.base_addr + XTTCPSS_IER_OFFSET);
+ __raw_writel(CLK_CNTRL_PRESCALE | CLK_CNTRL_PRESCALE_EN,
+ ttccs->xttc.base_addr + XTTCPSS_CLK_CNTRL_OFFSET);
+ __raw_writel(CNT_CNTRL_RESET,
+ ttccs->xttc.base_addr + XTTCPSS_CNT_CNTRL_OFFSET);
+
+ err = clocksource_register_hz(&ttccs->cs, clk_get_rate(clk) / PRESCALE);
+ if (WARN_ON(err))
+ return;
+}
+
+static void __init zynq_ttc_setup_clockevent(struct device_node *np,
+ void __iomem *base)
+{
+ struct xttcpss_timer_clockevent *ttcce;
+ int err, irq;
+ u32 reg;
+
+ ttcce = kzalloc(sizeof(*ttcce), GFP_KERNEL);
+ if (WARN_ON(!ttcce))
+ return;
+
+ err = of_property_read_u32(np, "reg", &reg);
+ if (WARN_ON(err))
+ return;
+
+ ttcce->xttc.base_addr = base + reg * 4;
+
+ ttcce->clk = of_clk_get_by_name(np, "cpu_1x");
+ if (WARN_ON(IS_ERR(ttcce->clk)))
+ return;
+
+ err = clk_prepare_enable(ttcce->clk);
+ if (WARN_ON(err))
+ return;
+
+ irq = irq_of_parse_and_map(np, 0);
+ if (WARN_ON(!irq))
+ return;
+
+ ttcce->ce.name = np->name;
+ ttcce->ce.features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT;
+ ttcce->ce.set_next_event = xttcpss_set_next_event;
+ ttcce->ce.set_mode = xttcpss_set_mode;
+ ttcce->ce.rating = 200;
+ ttcce->ce.irq = irq;
+
+ __raw_writel(0x23, ttcce->xttc.base_addr + XTTCPSS_CNT_CNTRL_OFFSET);
+ __raw_writel(CLK_CNTRL_PRESCALE | CLK_CNTRL_PRESCALE_EN,
+ ttcce->xttc.base_addr + XTTCPSS_CLK_CNTRL_OFFSET);
+ __raw_writel(0x1, ttcce->xttc.base_addr + XTTCPSS_IER_OFFSET);
+
+ err = request_irq(irq, xttcpss_clock_event_interrupt, IRQF_TIMER,
+ np->name, ttcce);
+ if (WARN_ON(err))
+ return;
+
+ clockevents_config_and_register(&ttcce->ce,
+ clk_get_rate(ttcce->clk) / PRESCALE,
+ 1, 0xfffe);
+}
+
+static const __initconst struct of_device_id zynq_ttc_match[] = {
+ { .compatible = "xlnx,ttc-counter-clocksource",
+ .data = zynq_ttc_setup_clocksource, },
+ { .compatible = "xlnx,ttc-counter-clockevent",
+ .data = zynq_ttc_setup_clockevent, },
+ {}
};
/**
@@ -269,30 +307,27 @@ static struct clock_event_device xttcpss_clockevent = {
* Initializes the timer hardware and register the clock source and clock event
* timers with Linux kernal timer framework
**/
-static void __init xttcpss_timer_init(void)
+void __init xttcpss_timer_init(void)
{
- xttcpss_timer_hardware_init();
- clocksource_register_hz(&clocksource_xttcpss, TIMER_RATE);
-
- /* Calculate the parameters to allow the clockevent to operate using
- integer math
- */
- clockevents_calc_mult_shift(&xttcpss_clockevent, TIMER_RATE, 4);
-
- xttcpss_clockevent.max_delta_ns =
- clockevent_delta2ns(0xfffe, &xttcpss_clockevent);
- xttcpss_clockevent.min_delta_ns =
- clockevent_delta2ns(1, &xttcpss_clockevent);
-
- /* Indicate that clock event is on 1st CPU as SMP boot needs it */
-
- xttcpss_clockevent.cpumask = cpumask_of(0);
- clockevents_register_device(&xttcpss_clockevent);
+ struct device_node *np;
+
+ for_each_compatible_node(np, NULL, "xlnx,ttc") {
+ struct device_node *np_chld;
+ void __iomem *base;
+
+ base = of_iomap(np, 0);
+ if (WARN_ON(!base))
+ return;
+
+ for_each_available_child_of_node(np, np_chld) {
+ int (*cb)(struct device_node *np, void __iomem *base);
+ const struct of_device_id *match;
+
+ match = of_match_node(zynq_ttc_match, np_chld);
+ if (match) {
+ cb = match->data;
+ cb(np_chld, base);
+ }
+ }
+ }
}
-
-/*
- * Instantiate and initialize the system timer structure
- */
-struct sys_timer xttcpss_sys_timer = {
- .init = xttcpss_timer_init,
-};
diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index 71a25b91de00..d35a34c58369 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -19,6 +19,7 @@ endif
obj-$(CONFIG_MACH_LOONGSON1) += clk-ls1x.o
obj-$(CONFIG_ARCH_U8500) += ux500/
obj-$(CONFIG_ARCH_VT8500) += clk-vt8500.o
+obj-$(CONFIG_ARCH_ZYNQ) += clk-zynq.o
# Chip specific
obj-$(CONFIG_COMMON_CLK_WM831X) += clk-wm831x.o
diff --git a/drivers/clk/clk-zynq.c b/drivers/clk/clk-zynq.c
new file mode 100644
index 000000000000..37a30514fd66
--- /dev/null
+++ b/drivers/clk/clk-zynq.c
@@ -0,0 +1,383 @@
+/*
+ * Copyright (c) 2012 National Instruments
+ *
+ * Josh Cartwright <josh.cartwright@ni.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/slab.h>
+#include <linux/kernel.h>
+#include <linux/clk-provider.h>
+
+static void __iomem *slcr_base;
+
+struct zynq_pll_clk {
+ struct clk_hw hw;
+ void __iomem *pll_ctrl;
+ void __iomem *pll_cfg;
+};
+
+#define to_zynq_pll_clk(hw) container_of(hw, struct zynq_pll_clk, hw)
+
+#define CTRL_PLL_FDIV(x) ((x) >> 12)
+
+static unsigned long zynq_pll_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct zynq_pll_clk *pll = to_zynq_pll_clk(hw);
+ return parent_rate * CTRL_PLL_FDIV(ioread32(pll->pll_ctrl));
+}
+
+static const struct clk_ops zynq_pll_clk_ops = {
+ .recalc_rate = zynq_pll_recalc_rate,
+};
+
+static void __init zynq_pll_clk_setup(struct device_node *np)
+{
+ struct clk_init_data init;
+ struct zynq_pll_clk *pll;
+ const char *parent_name;
+ struct clk *clk;
+ u32 regs[2];
+ int ret;
+
+ ret = of_property_read_u32_array(np, "reg", regs, ARRAY_SIZE(regs));
+ if (WARN_ON(ret))
+ return;
+
+ pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+ if (WARN_ON(!pll))
+ return;
+
+ pll->pll_ctrl = slcr_base + regs[0];
+ pll->pll_cfg = slcr_base + regs[1];
+
+ of_property_read_string(np, "clock-output-names", &init.name);
+
+ init.ops = &zynq_pll_clk_ops;
+ parent_name = of_clk_get_parent_name(np, 0);
+ init.parent_names = &parent_name;
+ init.num_parents = 1;
+
+ pll->hw.init = &init;
+
+ clk = clk_register(NULL, &pll->hw);
+ if (WARN_ON(IS_ERR(clk)))
+ return;
+
+ ret = of_clk_add_provider(np, of_clk_src_simple_get, clk);
+ if (WARN_ON(ret))
+ return;
+}
+
+struct zynq_periph_clk {
+ struct clk_hw hw;
+ struct clk_onecell_data onecell_data;
+ struct clk *gates[2];
+ void __iomem *clk_ctrl;
+ spinlock_t clkact_lock;
+};
+
+#define to_zynq_periph_clk(hw) container_of(hw, struct zynq_periph_clk, hw)
+
+static const u8 periph_clk_parent_map[] = {
+ 0, 0, 1, 2
+};
+#define PERIPH_CLK_CTRL_SRC(x) (periph_clk_parent_map[((x) & 0x30) >> 4])
+#define PERIPH_CLK_CTRL_DIV(x) (((x) & 0x3F00) >> 8)
+
+static unsigned long zynq_periph_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct zynq_periph_clk *periph = to_zynq_periph_clk(hw);
+ return parent_rate / PERIPH_CLK_CTRL_DIV(ioread32(periph->clk_ctrl));
+}
+
+static u8 zynq_periph_get_parent(struct clk_hw *hw)
+{
+ struct zynq_periph_clk *periph = to_zynq_periph_clk(hw);
+ return PERIPH_CLK_CTRL_SRC(ioread32(periph->clk_ctrl));
+}
+
+static const struct clk_ops zynq_periph_clk_ops = {
+ .recalc_rate = zynq_periph_recalc_rate,
+ .get_parent = zynq_periph_get_parent,
+};
+
+static void __init zynq_periph_clk_setup(struct device_node *np)
+{
+ struct zynq_periph_clk *periph;
+ const char *parent_names[3];
+ struct clk_init_data init;
+ int clk_num = 0, err;
+ const char *name;
+ struct clk *clk;
+ u32 reg;
+ int i;
+
+ err = of_property_read_u32(np, "reg", &reg);
+ if (WARN_ON(err))
+ return;
+
+ periph = kzalloc(sizeof(*periph), GFP_KERNEL);
+ if (WARN_ON(!periph))
+ return;
+
+ periph->clk_ctrl = slcr_base + reg;
+ spin_lock_init(&periph->clkact_lock);
+
+ init.name = np->name;
+ init.ops = &zynq_periph_clk_ops;
+ for (i = 0; i < ARRAY_SIZE(parent_names); i++)
+ parent_names[i] = of_clk_get_parent_name(np, i);
+ init.parent_names = parent_names;
+ init.num_parents = ARRAY_SIZE(parent_names);
+
+ periph->hw.init = &init;
+
+ clk = clk_register(NULL, &periph->hw);
+ if (WARN_ON(IS_ERR(clk)))
+ return;
+
+ err = of_clk_add_provider(np, of_clk_src_simple_get, clk);
+ if (WARN_ON(err))
+ return;
+
+ err = of_property_read_string_index(np, "clock-output-names", 0,
+ &name);
+ if (WARN_ON(err))
+ return;
+
+ periph->gates[0] = clk_register_gate(NULL, name, np->name, 0,
+ periph->clk_ctrl, 0, 0,
+ &periph->clkact_lock);
+ if (WARN_ON(IS_ERR(periph->gates[0])))
+ return;
+ clk_num++;
+
+ /* some periph clks have 2 downstream gates */
+ err = of_property_read_string_index(np, "clock-output-names", 1,
+ &name);
+ if (err != -ENODATA) {
+ periph->gates[1] = clk_register_gate(NULL, name, np->name, 0,
+ periph->clk_ctrl, 1, 0,
+ &periph->clkact_lock);
+ if (WARN_ON(IS_ERR(periph->gates[1])))
+ return;
+ clk_num++;
+ }
+
+ periph->onecell_data.clks = periph->gates;
+ periph->onecell_data.clk_num = clk_num;
+
+ err = of_clk_add_provider(np, of_clk_src_onecell_get,
+ &periph->onecell_data);
+ if (WARN_ON(err))
+ return;
+}
+
+/* CPU Clock domain is modelled as a mux with 4 children subclks, whose
+ * derivative rates depend on CLK_621_TRUE
+ */
+
+struct zynq_cpu_clk {
+ struct clk_hw hw;
+ struct clk_onecell_data onecell_data;
+ struct clk *subclks[4];
+ void __iomem *clk_ctrl;
+ spinlock_t clkact_lock;
+};
+
+#define to_zynq_cpu_clk(hw) container_of(hw, struct zynq_cpu_clk, hw)
+
+static const u8 zynq_cpu_clk_parent_map[] = {
+ 1, 1, 2, 0
+};
+#define CPU_CLK_SRCSEL(x) (zynq_cpu_clk_parent_map[(((x) & 0x30) >> 4)])
+#define CPU_CLK_CTRL_DIV(x) (((x) & 0x3F00) >> 8)
+
+static u8 zynq_cpu_clk_get_parent(struct clk_hw *hw)
+{
+ struct zynq_cpu_clk *cpuclk = to_zynq_cpu_clk(hw);
+ return CPU_CLK_SRCSEL(ioread32(cpuclk->clk_ctrl));
+}
+
+static unsigned long zynq_cpu_clk_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct zynq_cpu_clk *cpuclk = to_zynq_cpu_clk(hw);
+ return parent_rate / CPU_CLK_CTRL_DIV(ioread32(cpuclk->clk_ctrl));
+}
+
+static const struct clk_ops zynq_cpu_clk_ops = {
+ .get_parent = zynq_cpu_clk_get_parent,
+ .recalc_rate = zynq_cpu_clk_recalc_rate,
+};
+
+struct zynq_cpu_subclk {
+ struct clk_hw hw;
+ void __iomem *clk_621;
+ enum {
+ CPU_SUBCLK_6X4X,
+ CPU_SUBCLK_3X2X,
+ CPU_SUBCLK_2X,
+ CPU_SUBCLK_1X,
+ } which;
+};
+
+#define CLK_621_TRUE(x) ((x) & 1)
+
+#define to_zynq_cpu_subclk(hw) container_of(hw, struct zynq_cpu_subclk, hw);
+
+static unsigned long zynq_cpu_subclk_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ unsigned long uninitialized_var(rate);
+ struct zynq_cpu_subclk *subclk;
+ bool is_621;
+
+ subclk = to_zynq_cpu_subclk(hw)
+ is_621 = CLK_621_TRUE(ioread32(subclk->clk_621));
+
+ switch (subclk->which) {
+ case CPU_SUBCLK_6X4X:
+ rate = parent_rate;
+ break;
+ case CPU_SUBCLK_3X2X:
+ rate = parent_rate / 2;
+ break;
+ case CPU_SUBCLK_2X:
+ rate = parent_rate / (is_621 ? 3 : 2);
+ break;
+ case CPU_SUBCLK_1X:
+ rate = parent_rate / (is_621 ? 6 : 4);
+ break;
+ };
+
+ return rate;
+}
+
+static const struct clk_ops zynq_cpu_subclk_ops = {
+ .recalc_rate = zynq_cpu_subclk_recalc_rate,
+};
+
+static struct clk *zynq_cpu_subclk_setup(struct device_node *np, u8 which,
+ void __iomem *clk_621)
+{
+ struct zynq_cpu_subclk *subclk;
+ struct clk_init_data init;
+ struct clk *clk;
+ int err;
+
+ err = of_property_read_string_index(np, "clock-output-names",
+ which, &init.name);
+ if (WARN_ON(err))
+ goto err_read_output_name;
+
+ subclk = kzalloc(sizeof(*subclk), GFP_KERNEL);
+ if (!subclk)
+ goto err_subclk_alloc;
+
+ subclk->clk_621 = clk_621;
+ subclk->which = which;
+
+ init.ops = &zynq_cpu_subclk_ops;
+ init.parent_names = &np->name;
+ init.num_parents = 1;
+
+ subclk->hw.init = &init;
+
+ clk = clk_register(NULL, &subclk->hw);
+ if (WARN_ON(IS_ERR(clk)))
+ goto err_clk_register;
+
+ return clk;
+
+err_clk_register:
+ kfree(subclk);
+err_subclk_alloc:
+err_read_output_name:
+ return ERR_PTR(-EINVAL);
+}
+
+static void __init zynq_cpu_clk_setup(struct device_node *np)
+{
+ struct zynq_cpu_clk *cpuclk;
+ const char *parent_names[3];
+ struct clk_init_data init;
+ void __iomem *clk_621;
+ struct clk *clk;
+ u32 reg[2];
+ int err;
+ int i;
+
+ err = of_property_read_u32_array(np, "reg", reg, ARRAY_SIZE(reg));
+ if (WARN_ON(err))
+ return;
+
+ cpuclk = kzalloc(sizeof(*cpuclk), GFP_KERNEL);
+ if (WARN_ON(!cpuclk))
+ return;
+
+ cpuclk->clk_ctrl = slcr_base + reg[0];
+ clk_621 = slcr_base + reg[1];
+ spin_lock_init(&cpuclk->clkact_lock);
+
+ init.name = np->name;
+ init.ops = &zynq_cpu_clk_ops;
+ for (i = 0; i < ARRAY_SIZE(parent_names); i++)
+ parent_names[i] = of_clk_get_parent_name(np, i);
+ init.parent_names = parent_names;
+ init.num_parents = ARRAY_SIZE(parent_names);
+
+ cpuclk->hw.init = &init;
+
+ clk = clk_register(NULL, &cpuclk->hw);
+ if (WARN_ON(IS_ERR(clk)))
+ return;
+
+ err = of_clk_add_provider(np, of_clk_src_simple_get, clk);
+ if (WARN_ON(err))
+ return;
+
+ for (i = 0; i < 4; i++) {
+ cpuclk->subclks[i] = zynq_cpu_subclk_setup(np, i, clk_621);
+ if (WARN_ON(IS_ERR(cpuclk->subclks[i])))
+ return;
+ }
+
+ cpuclk->onecell_data.clks = cpuclk->subclks;
+ cpuclk->onecell_data.clk_num = i;
+
+ err = of_clk_add_provider(np, of_clk_src_onecell_get,
+ &cpuclk->onecell_data);
+ if (WARN_ON(err))
+ return;
+}
+
+static const __initconst struct of_device_id zynq_clk_match[] = {
+ { .compatible = "fixed-clock", .data = of_fixed_clk_setup, },
+ { .compatible = "xlnx,zynq-pll", .data = zynq_pll_clk_setup, },
+ { .compatible = "xlnx,zynq-periph-clock",
+ .data = zynq_periph_clk_setup, },
+ { .compatible = "xlnx,zynq-cpu-clock", .data = zynq_cpu_clk_setup, },
+ {}
+};
+
+void __init xilinx_zynq_clocks_init(void __iomem *slcr)
+{
+ slcr_base = slcr;
+ of_clk_init(zynq_clk_match);
+}
diff --git a/include/linux/clk/zynq.h b/include/linux/clk/zynq.h
new file mode 100644
index 000000000000..56be7cd9aa8b
--- /dev/null
+++ b/include/linux/clk/zynq.h
@@ -0,0 +1,24 @@
+/*
+ * Copyright (C) 2012 National Instruments
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#ifndef __LINUX_CLK_ZYNQ_H_
+#define __LINUX_CLK_ZYNQ_H_
+
+void __init xilinx_zynq_clocks_init(void __iomem *slcr);
+
+#endif
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-16 12:25:23 +0000