i.MXC family: Adding timer support

This patch adds timer support for the i.MX machine family. This code can
be used on the following machs:

 - i.MX1 (tested)
 - i.MX2 (i.MX21 (to be tested), i.MX27 (tested))
 - i.MX3 (i.MX31 (tested))

TODO: It seems impossible to build a kernel for more than one CPU because the
timer do not follow the platform device rules. So it does only work if
timer 1 can be accessed on all CPUs at the same address.

Signed-off-by: Juergen Beisert <j.beisert@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 158 insertions, 0 deletions

diff --git a/include/asm-arm/arch-mxc/mxc_timer.h b/include/asm-arm/arch-mxc/mxc_timer.h
new file mode 100644
index 000000000000..6cb11f4f1a06
--- /dev/null
+++ b/include/asm-arm/arch-mxc/mxc_timer.h
@@ -0,0 +1,158 @@
+/*
+ * mxc_timer.h
+ *
+ * Copyright (C) 2008 Juergen Beisert (kernel@pengutronix.de)
+ *
+ * Platform independent (i.MX1, i.MX2, i.MX3) definition for timer handling.
+ *
+ * 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., 51 Franklin Street, Fifth Floor,
+ * Boston, MA  02110-1301, USA.
+ */
+
+#ifndef __PLAT_MXC_TIMER_H
+#define __PLAT_MXC_TIMER_H
+
+#include <linux/clk.h>
+#include <asm/hardware.h>
+
+#ifdef CONFIG_ARCH_IMX
+#define TIMER_BASE              IO_ADDRESS(TIM1_BASE_ADDR)
+#define TIMER_INTERRUPT         TIM1_INT
+
+#define TCTL_VAL                TCTL_CLK_PCLK1
+#define TCTL_IRQEN              (1<<4)
+#define TCTL_FRR                (1<<8)
+#define TCTL_CLK_PCLK1          (1<<1)
+#define TCTL_CLK_PCLK1_4        (2<<1)
+#define TCTL_CLK_TIN            (3<<1)
+#define TCTL_CLK_32             (4<<1)
+
+#define MXC_TCTL   0x00
+#define MXC_TPRER  0x04
+#define MXC_TCMP   0x08
+#define MXC_TCR    0x0c
+#define MXC_TCN    0x10
+#define MXC_TSTAT  0x14
+#define TSTAT_CAPT              (1<<1)
+#define TSTAT_COMP              (1<<0)
+
+static inline void gpt_irq_disable(void)
+{
+        unsigned int tmp;
+
+        tmp = __raw_readl(TIMER_BASE + MXC_TCTL);
+        __raw_writel(tmp & ~TCTL_IRQEN, TIMER_BASE + MXC_TCTL);
+}
+
+static inline void gpt_irq_enable(void)
+{
+        __raw_writel(__raw_readl(TIMER_BASE + MXC_TCTL) | TCTL_IRQEN,
+                                TIMER_BASE + MXC_TCTL);
+}
+
+static void gpt_irq_acknowledge(void)
+{
+        __raw_writel(0, TIMER_BASE + MXC_TSTAT);
+}
+#endif /* CONFIG_ARCH_IMX */
+
+#ifdef CONFIG_ARCH_MX2
+#define TIMER_BASE              IO_ADDRESS(GPT1_BASE_ADDR)
+#define TIMER_INTERRUPT         MXC_INT_GPT1
+
+#define MXC_TCTL   0x00
+#define TCTL_VAL                TCTL_CLK_PCLK1
+#define TCTL_CLK_PCLK1          (1<<1)
+#define TCTL_CLK_PCLK1_4        (2<<1)
+#define TCTL_IRQEN              (1<<4)
+#define TCTL_FRR                (1<<8)
+#define MXC_TPRER  0x04
+#define MXC_TCMP   0x08
+#define MXC_TCR    0x0c
+#define MXC_TCN    0x10
+#define MXC_TSTAT  0x14
+#define TSTAT_CAPT              (1<<1)
+#define TSTAT_COMP              (1<<0)
+
+static inline void gpt_irq_disable(void)
+{
+        unsigned int tmp;
+
+        tmp = __raw_readl(TIMER_BASE + MXC_TCTL);
+        __raw_writel(tmp & ~TCTL_IRQEN, TIMER_BASE + MXC_TCTL);
+}
+
+static inline void gpt_irq_enable(void)
+{
+        __raw_writel(__raw_readl(TIMER_BASE + MXC_TCTL) | TCTL_IRQEN,
+                                TIMER_BASE + MXC_TCTL);
+}
+
+static void gpt_irq_acknowledge(void)
+{
+        __raw_writel(TSTAT_CAPT | TSTAT_COMP, TIMER_BASE + MXC_TSTAT);
+}
+#endif /* CONFIG_ARCH_MX2 */
+
+#ifdef CONFIG_ARCH_MX3
+#define TIMER_BASE              IO_ADDRESS(GPT1_BASE_ADDR)
+#define TIMER_INTERRUPT         MXC_INT_GPT
+
+#define MXC_TCTL   0x00
+#define TCTL_VAL                (TCTL_CLK_IPG | TCTL_WAITEN)
+#define TCTL_CLK_IPG            (1<<6)
+#define TCTL_FRR                (1<<9)
+#define TCTL_WAITEN             (1<<3)
+
+#define MXC_TPRER  0x04
+#define MXC_TSTAT  0x08
+#define TSTAT_OF1               (1<<0)
+#define TSTAT_OF2               (1<<1)
+#define TSTAT_OF3               (1<<2)
+#define TSTAT_IF1               (1<<3)
+#define TSTAT_IF2               (1<<4)
+#define TSTAT_ROV               (1<<5)
+#define MXC_IR     0x0c
+#define MXC_TCMP   0x10
+#define MXC_TCMP2  0x14
+#define MXC_TCMP3  0x18
+#define MXC_TCR    0x1c
+#define MXC_TCN    0x24
+
+static inline void gpt_irq_disable(void)
+{
+        __raw_writel(0, TIMER_BASE + MXC_IR);
+}
+
+static inline void gpt_irq_enable(void)
+{
+        __raw_writel(1<<0, TIMER_BASE + MXC_IR);
+}
+
+static inline void gpt_irq_acknowledge(void)
+{
+        __raw_writel(TSTAT_OF1, TIMER_BASE + MXC_TSTAT);
+}
+#endif /* CONFIG_ARCH_MX3 */
+
+#define TCTL_SWR                (1<<15)
+#define TCTL_CC                 (1<<10)
+#define TCTL_OM                 (1<<9)
+#define TCTL_CAP_RIS            (1<<6)
+#define TCTL_CAP_FAL            (2<<6)
+#define TCTL_CAP_RIS_FAL        (3<<6)
+#define TCTL_CAP_ENA            (1<<5)
+#define TCTL_TEN                (1<<0)
+
+#endif