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Date: Mon, 11 Jun 2012 17:40:03 +0200
From: Linus Walleij <linus.walleij@...aro.org>
To: linux-arm-kernel@...ts.infradead.org, arm@...nel.org,
linux-kernel@...r.kernel.org
Cc: Linus Walleij <linus.walleij@...aro.org>,
Russell King <linux@....linux.org.uk>,
Mike Turquette <mturquette@...com>
Subject: [PATCH 3/3] ARM: integrator: convert to common clock
This converts the Integrator platform to use common clock
and the ICST driver. Since from this point not all ARM
reference platforms use the clock, we define
CONFIG_PLAT_VERSATILE_CLOCK and select it for all platforms
except the Integrator.
Open issue: I could not use the .init_early() field of the
machine descriptor to initialize the clocks, but had to
move them to .init_irq(), so presumably .init_early() is
so early that common clock is not up, and .init_machine()
is too late since it's needed for the clockevent/clocksource
initialization. Any suggestions on how to solve this is
very welcome.
Cc: Russell King <linux@....linux.org.uk>
Cc: Mike Turquette <mturquette@...com>
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
---
arch/arm/Kconfig | 7 +-
arch/arm/mach-integrator/core.c | 45 ----------
arch/arm/mach-integrator/include/mach/clkdev.h | 26 ------
arch/arm/mach-integrator/integrator_ap.c | 8 ++-
arch/arm/mach-integrator/integrator_cp.c | 63 +-------------
arch/arm/plat-versatile/Kconfig | 3 +
arch/arm/plat-versatile/Makefile | 2 +-
drivers/clk/Makefile | 1 +
drivers/clk/clk-integrator.c | 111 ++++++++++++++++++++++++
include/linux/platform_data/clk-integrator.h | 1 +
10 files changed, 131 insertions(+), 136 deletions(-)
delete mode 100644 arch/arm/mach-integrator/include/mach/clkdev.h
create mode 100644 drivers/clk/clk-integrator.c
create mode 100644 include/linux/platform_data/clk-integrator.h
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index b649c59..a61afca 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -255,10 +255,10 @@ config ARCH_INTEGRATOR
bool "ARM Ltd. Integrator family"
select ARM_AMBA
select ARCH_HAS_CPUFREQ
- select CLKDEV_LOOKUP
- select HAVE_MACH_CLKDEV
+ select COMMON_CLK
select HAVE_TCM
select ICST
+ select CLK_ICST
select GENERIC_CLOCKEVENTS
select PLAT_VERSATILE
select PLAT_VERSATILE_FPGA_IRQ
@@ -278,6 +278,7 @@ config ARCH_REALVIEW
select GENERIC_CLOCKEVENTS
select ARCH_WANT_OPTIONAL_GPIOLIB
select PLAT_VERSATILE
+ select PLAT_VERSATILE_CLOCK
select PLAT_VERSATILE_CLCD
select ARM_TIMER_SP804
select GPIO_PL061 if GPIOLIB
@@ -295,6 +296,7 @@ config ARCH_VERSATILE
select GENERIC_CLOCKEVENTS
select ARCH_WANT_OPTIONAL_GPIOLIB
select PLAT_VERSATILE
+ select PLAT_VERSATILE_CLOCK
select PLAT_VERSATILE_CLCD
select PLAT_VERSATILE_FPGA_IRQ
select ARM_TIMER_SP804
@@ -314,6 +316,7 @@ config ARCH_VEXPRESS
select ICST
select NO_IOPORT
select PLAT_VERSATILE
+ select PLAT_VERSATILE_CLOCK
select PLAT_VERSATILE_CLCD
help
This enables support for the ARM Ltd Versatile Express boards.
diff --git a/arch/arm/mach-integrator/core.c b/arch/arm/mach-integrator/core.c
index 2a20bba..ebf680b 100644
--- a/arch/arm/mach-integrator/core.c
+++ b/arch/arm/mach-integrator/core.c
@@ -21,7 +21,6 @@
#include <linux/amba/bus.h>
#include <linux/amba/serial.h>
#include <linux/io.h>
-#include <linux/clkdev.h>
#include <mach/hardware.h>
#include <mach/platform.h>
@@ -61,50 +60,6 @@ static struct amba_device *amba_devs[] __initdata = {
&kmi1_device,
};
-/*
- * These are fixed clocks.
- */
-static struct clk clk24mhz = {
- .rate = 24000000,
-};
-
-static struct clk uartclk = {
- .rate = 14745600,
-};
-
-static struct clk dummy_apb_pclk;
-
-static struct clk_lookup lookups[] = {
- { /* Bus clock */
- .con_id = "apb_pclk",
- .clk = &dummy_apb_pclk,
- }, {
- /* Integrator/AP timer frequency */
- .dev_id = "ap_timer",
- .clk = &clk24mhz,
- }, { /* UART0 */
- .dev_id = "uart0",
- .clk = &uartclk,
- }, { /* UART1 */
- .dev_id = "uart1",
- .clk = &uartclk,
- }, { /* KMI0 */
- .dev_id = "kmi0",
- .clk = &clk24mhz,
- }, { /* KMI1 */
- .dev_id = "kmi1",
- .clk = &clk24mhz,
- }, { /* MMCI - IntegratorCP */
- .dev_id = "mmci",
- .clk = &uartclk,
- }
-};
-
-void __init integrator_init_early(void)
-{
- clkdev_add_table(lookups, ARRAY_SIZE(lookups));
-}
-
static int __init integrator_init(void)
{
int i;
diff --git a/arch/arm/mach-integrator/include/mach/clkdev.h b/arch/arm/mach-integrator/include/mach/clkdev.h
deleted file mode 100644
index bfe0767..0000000
--- a/arch/arm/mach-integrator/include/mach/clkdev.h
+++ /dev/null
@@ -1,26 +0,0 @@
-#ifndef __ASM_MACH_CLKDEV_H
-#define __ASM_MACH_CLKDEV_H
-
-#include <linux/module.h>
-#include <plat/clock.h>
-
-struct clk {
- unsigned long rate;
- const struct clk_ops *ops;
- struct module *owner;
- const struct icst_params *params;
- void __iomem *vcoreg;
- void *data;
-};
-
-static inline int __clk_get(struct clk *clk)
-{
- return try_module_get(clk->owner);
-}
-
-static inline void __clk_put(struct clk *clk)
-{
- module_put(clk->owner);
-}
-
-#endif
diff --git a/arch/arm/mach-integrator/integrator_ap.c b/arch/arm/mach-integrator/integrator_ap.c
index c857501..7b1055c 100644
--- a/arch/arm/mach-integrator/integrator_ap.c
+++ b/arch/arm/mach-integrator/integrator_ap.c
@@ -33,6 +33,7 @@
#include <linux/io.h>
#include <linux/mtd/physmap.h>
#include <linux/clk.h>
+#include <linux/platform_data/clk-integrator.h>
#include <video/vga.h>
#include <mach/hardware.h>
@@ -174,6 +175,7 @@ static void __init ap_init_irq(void)
fpga_irq_init(VA_IC_BASE, "SC", IRQ_PIC_START,
-1, INTEGRATOR_SC_VALID_INT, NULL);
+ integrator_clk_init(false);
}
#ifdef CONFIG_PM
@@ -440,6 +442,10 @@ static void integrator_clockevent_init(unsigned long inrate)
0xffffU);
}
+void __init ap_init_early(void)
+{
+}
+
/*
* Set up timer(s).
*/
@@ -471,7 +477,7 @@ MACHINE_START(INTEGRATOR, "ARM-Integrator")
.reserve = integrator_reserve,
.map_io = ap_map_io,
.nr_irqs = NR_IRQS_INTEGRATOR_AP,
- .init_early = integrator_init_early,
+ .init_early = ap_init_early,
.init_irq = ap_init_irq,
.handle_irq = fpga_handle_irq,
.timer = &ap_timer,
diff --git a/arch/arm/mach-integrator/integrator_cp.c b/arch/arm/mach-integrator/integrator_cp.c
index a8c6480..82d5c83 100644
--- a/arch/arm/mach-integrator/integrator_cp.c
+++ b/arch/arm/mach-integrator/integrator_cp.c
@@ -21,8 +21,8 @@
#include <linux/amba/mmci.h>
#include <linux/io.h>
#include <linux/gfp.h>
-#include <linux/clkdev.h>
#include <linux/mtd/physmap.h>
+#include <linux/platform_data/clk-integrator.h>
#include <mach/hardware.h>
#include <mach/platform.h>
@@ -171,65 +171,10 @@ static void __init intcp_init_irq(void)
fpga_irq_init(INTCP_VA_SIC_BASE, "SIC", IRQ_SIC_START,
IRQ_CP_CPPLDINT, sic_mask, NULL);
+ integrator_clk_init(true);
}
/*
- * Clock handling
- */
-#define CM_LOCK (__io_address(INTEGRATOR_HDR_BASE)+INTEGRATOR_HDR_LOCK_OFFSET)
-#define CM_AUXOSC (__io_address(INTEGRATOR_HDR_BASE)+0x1c)
-
-static const struct icst_params cp_auxvco_params = {
- .ref = 24000000,
- .vco_max = ICST525_VCO_MAX_5V,
- .vco_min = ICST525_VCO_MIN,
- .vd_min = 8,
- .vd_max = 263,
- .rd_min = 3,
- .rd_max = 65,
- .s2div = icst525_s2div,
- .idx2s = icst525_idx2s,
-};
-
-static void cp_auxvco_set(struct clk *clk, struct icst_vco vco)
-{
- u32 val;
-
- val = readl(clk->vcoreg) & ~0x7ffff;
- val |= vco.v | (vco.r << 9) | (vco.s << 16);
-
- writel(0xa05f, CM_LOCK);
- writel(val, clk->vcoreg);
- writel(0, CM_LOCK);
-}
-
-static const struct clk_ops cp_auxclk_ops = {
- .round = icst_clk_round,
- .set = icst_clk_set,
- .setvco = cp_auxvco_set,
-};
-
-static struct clk cp_auxclk = {
- .ops = &cp_auxclk_ops,
- .params = &cp_auxvco_params,
- .vcoreg = CM_AUXOSC,
-};
-
-static struct clk sp804_clk = {
- .rate = 1000000,
-};
-
-static struct clk_lookup cp_lookups[] = {
- { /* CLCD */
- .dev_id = "clcd",
- .clk = &cp_auxclk,
- }, { /* SP804 timers */
- .dev_id = "sp804",
- .clk = &sp804_clk,
- },
-};
-
-/*
* Flash handling.
*/
static int intcp_flash_init(struct platform_device *dev)
@@ -406,10 +351,6 @@ static struct amba_device *amba_devs[] __initdata = {
static void __init intcp_init_early(void)
{
- clkdev_add_table(cp_lookups, ARRAY_SIZE(cp_lookups));
-
- integrator_init_early();
-
#ifdef CONFIG_PLAT_VERSATILE_SCHED_CLOCK
versatile_sched_clock_init(REFCOUNTER, 24000000);
#endif
diff --git a/arch/arm/plat-versatile/Kconfig b/arch/arm/plat-versatile/Kconfig
index 81ee7cc..8d5c10a 100644
--- a/arch/arm/plat-versatile/Kconfig
+++ b/arch/arm/plat-versatile/Kconfig
@@ -1,5 +1,8 @@
if PLAT_VERSATILE
+config PLAT_VERSATILE_CLOCK
+ bool
+
config PLAT_VERSATILE_CLCD
bool
diff --git a/arch/arm/plat-versatile/Makefile b/arch/arm/plat-versatile/Makefile
index a5cb194..272769a8 100644
--- a/arch/arm/plat-versatile/Makefile
+++ b/arch/arm/plat-versatile/Makefile
@@ -1,4 +1,4 @@
-obj-y := clock.o
+obj-$(CONFIG_PLAT_VERSATILE_CLOCK) += clock.o
obj-$(CONFIG_PLAT_VERSATILE_CLCD) += clcd.o
obj-$(CONFIG_PLAT_VERSATILE_FPGA_IRQ) += fpga-irq.o
obj-$(CONFIG_PLAT_VERSATILE_LEDS) += leds.o
diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index a7a7cf8..39e613b 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -6,3 +6,4 @@ obj-$(CONFIG_COMMON_CLK) += clk.o clk-fixed-rate.o clk-gate.o \
obj-$(CONFIG_ARCH_MXS) += mxs/
obj-$(CONFIG_PLAT_SPEAR) += spear/
obj-$(CONFIG_CLK_ICST) += clk-icst.o
+obj-$(CONFIG_ARCH_INTEGRATOR) += clk-integrator.o
diff --git a/drivers/clk/clk-integrator.c b/drivers/clk/clk-integrator.c
new file mode 100644
index 0000000..a948389
--- /dev/null
+++ b/drivers/clk/clk-integrator.c
@@ -0,0 +1,111 @@
+#include <linux/clk.h>
+#include <linux/clkdev.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/clk-provider.h>
+
+#include <mach/hardware.h>
+#include <mach/platform.h>
+
+#include "clk-icst.h"
+
+/*
+ * Implementation of the ARM Integrator/AP and Integrator/CP clock tree.
+ * Inspired by portions of:
+ * plat-versatile/clock.c and plat-versatile/include/plat/clock.h
+ */
+#define CM_LOCK (__io_address(INTEGRATOR_HDR_BASE)+INTEGRATOR_HDR_LOCK_OFFSET)
+#define CM_AUXOSC (__io_address(INTEGRATOR_HDR_BASE)+0x1c)
+
+/**
+ * cp_auxvco_get() - get ICST VCO settings for the Integrator/CP
+ * @vco: ICST VCO parameters to update with hardware status
+ */
+static struct icst_vco cp_auxvco_get(void)
+{
+ u32 val;
+ struct icst_vco vco;
+
+ val = readl(CM_AUXOSC);
+ vco.v = val & 0x1ff;
+ vco.r = (val >> 9) & 0x7f;
+ vco.s = (val >> 16) & 03;
+ return vco;
+}
+
+/**
+ * cp_auxvco_set() - commit changes to Integrator/CP ICST VCO
+ * @vco: ICST VCO parameters to commit
+ */
+static void cp_auxvco_set(struct icst_vco vco)
+{
+ u32 val;
+
+ val = readl(CM_AUXOSC) & ~0x7ffff;
+ val |= vco.v | (vco.r << 9) | (vco.s << 16);
+
+ /* This magic unlocks the CM VCO so it can be controlled */
+ writel(0xa05f, CM_LOCK);
+ writel(val, CM_AUXOSC);
+ /* This locks the CM again */
+ writel(0, CM_LOCK);
+}
+
+static const struct icst_params cp_auxvco_params = {
+ .ref = 24000000,
+ .vco_max = ICST525_VCO_MAX_5V,
+ .vco_min = ICST525_VCO_MIN,
+ .vd_min = 8,
+ .vd_max = 263,
+ .rd_min = 3,
+ .rd_max = 65,
+ .s2div = icst525_s2div,
+ .idx2s = icst525_idx2s,
+};
+
+static const struct clk_icst_desc __initdata cp_icst_desc = {
+ .params = &cp_auxvco_params,
+ .getvco = cp_auxvco_get,
+ .setvco = cp_auxvco_set,
+};
+
+/*
+ * integrator_clk_init() - set up the integrator clock tree
+ * @is_cp: pass true if it's the Integrator/CP else AP is assumed
+ */
+void __init integrator_clk_init(bool is_cp)
+{
+ struct clk *clk;
+
+ /* APB clock dummy */
+ clk = clk_register_fixed_rate(NULL, "apb_pclk", NULL, CLK_IS_ROOT, 0);
+ clk_register_clkdev(clk, "apb_pclk", NULL);
+
+ /* UART reference clock */
+ clk = clk_register_fixed_rate(NULL, "uartclk", NULL, CLK_IS_ROOT,
+ 14745600);
+ clk_register_clkdev(clk, NULL, "uart0");
+ clk_register_clkdev(clk, NULL, "uart1");
+ if (is_cp)
+ clk_register_clkdev(clk, NULL, "mmci");
+
+ /* 24 MHz clock */
+ clk = clk_register_fixed_rate(NULL, "clk24mhz", NULL, CLK_IS_ROOT,
+ 24000000);
+ clk_register_clkdev(clk, NULL, "kmi0");
+ clk_register_clkdev(clk, NULL, "kmi1");
+ if (!is_cp)
+ clk_register_clkdev(clk, NULL, "ap_timer");
+
+ if (!is_cp)
+ return;
+
+ /* 1 MHz clock */
+ clk = clk_register_fixed_rate(NULL, "clk1mhz", NULL, CLK_IS_ROOT,
+ 1000000);
+ clk_register_clkdev(clk, NULL, "sp804");
+
+ /* ICST VCO clock used on the Integrator/CP CLCD */
+ clk = icst_clk_init(NULL, &cp_icst_desc);
+ clk_register_clkdev(clk, NULL, "clcd");
+}
diff --git a/include/linux/platform_data/clk-integrator.h b/include/linux/platform_data/clk-integrator.h
new file mode 100644
index 0000000..83fe9c2
--- /dev/null
+++ b/include/linux/platform_data/clk-integrator.h
@@ -0,0 +1 @@
+void integrator_clk_init(bool is_cp);
--
1.7.7.6
--
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