From: Marian Balakowicz <m8@semihalf•com>
To: linuxppc-dev@ozlabs•org
Subject: [PATCH 12/15] [POWERPC] Add mpc52xx_restart(), mpc52xx_halt(), mpc52xx_power_off().
Date: Sun, 07 Oct 2007 13:32:02 +0200 [thread overview]
Message-ID: <4708C3B2.1050103@semihalf.com> (raw)
In-Reply-To: <47075FA7.3030108@semihalf.com>
Add common MPC5200 helper routines: mpc52xx_restart(), mpc52xx_halt(),
mpc52xx_power_off().
This patch relies on Sascha Hauer's patch published in:
http://patchwork.ozlabs.org/linuxppc/patch?id=8910.
Signed-off-by: Marian Balakowicz <m8@semihalf•com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix•de>
---
arch/powerpc/platforms/52xx/mpc52xx_common.c | 45 +++++++++++++++++++++++++++
include/asm-powerpc/mpc52xx.h | 7 ++++
2 files changed, 52 insertions(+)
diff --git a/arch/powerpc/platforms/52xx/mpc52xx_common.c b/arch/powerpc/platforms/52xx/mpc52xx_common.c
index b1cd7b0..e7087d7 100644
--- a/arch/powerpc/platforms/52xx/mpc52xx_common.c
+++ b/arch/powerpc/platforms/52xx/mpc52xx_common.c
@@ -88,6 +88,14 @@ mpc52xx_find_ipb_freq(struct device_node *node)
}
EXPORT_SYMBOL(mpc52xx_find_ipb_freq);
+/*
+ * This variable is mapped in mpc52xx_setup_cpu() by a call to
+ * mpc52xx_find_and_map(), and used in mpc52xx_restart(). This is because
+ * mpc52xx_restart() can be called from interrupt context (e.g., watchdog
+ * interrupt handler), and mpc52xx_find_and_map() (ioremap() to be exact)
+ * can't be called from interrupt context.
+ */
+volatile struct mpc52xx_gpt *mpc52xx_gpt0 = NULL;
void __init
mpc52xx_setup_cpu(void)
@@ -95,6 +103,9 @@ mpc52xx_setup_cpu(void)
struct mpc52xx_cdm __iomem *cdm;
struct mpc52xx_xlb __iomem *xlb;
+ /* mpc52xx_gpt0 is mapped here and used in mpc52xx_restart */
+ mpc52xx_gpt0 = mpc52xx_find_and_map("mpc5200-gpt");
+
/* Map zones */
cdm = mpc52xx_find_and_map("mpc5200-cdm");
xlb = mpc52xx_find_and_map("mpc5200-xlb");
@@ -138,3 +149,37 @@ mpc52xx_declare_of_platform_devices(void)
"Error while probing of_platform bus\n");
}
+void
+mpc52xx_restart(char *cmd)
+{
+ local_irq_disable();
+
+ /* Turn on the watchdog and wait for it to expire. It effectively
+ does a reset */
+ if (mpc52xx_gpt0) {
+ out_be32(&mpc52xx_gpt0->mode, 0x00000000);
+ out_be32(&mpc52xx_gpt0->count, 0x000000ff);
+ out_be32(&mpc52xx_gpt0->mode, 0x00009004);
+ } else
+ printk("mpc52xx_restart: Can't access gpt. "
+ "Restart impossible, system halted\n");
+
+ while (1);
+}
+
+void
+mpc52xx_halt(void)
+{
+ local_irq_disable();
+
+ while (1);
+}
+
+void
+mpc52xx_power_off(void)
+{
+ /* By default we don't have any way of shut down.
+ If a specific board wants to, it can set the power down
+ code to any hardware implementation dependent code */
+ mpc52xx_halt();
+}
diff --git a/include/asm-powerpc/mpc52xx.h b/include/asm-powerpc/mpc52xx.h
index a431798..8dfb4de 100644
--- a/include/asm-powerpc/mpc52xx.h
+++ b/include/asm-powerpc/mpc52xx.h
@@ -104,6 +104,9 @@ struct mpc52xx_gpt {
u32 status; /* GPTx + 0X0c */
};
+/* Static instance of GPT0 */
+extern volatile struct mpc52xx_gpt *mpc52xx_gpt0;
+
/* GPIO */
struct mpc52xx_gpio {
u32 port_config; /* GPIO + 0x00 */
@@ -257,6 +260,10 @@ extern unsigned int mpc52xx_get_irq(void);
extern int __init mpc52xx_add_bridge(struct device_node *node);
+extern void mpc52xx_restart(char *cmd);
+extern void mpc52xx_halt(void);
+extern void mpc52xx_power_off(void);
+
#endif /* __ASSEMBLY__ */
#ifdef CONFIG_PM
next prev parent reply other threads:[~2007-10-07 11:32 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-06 10:12 [PATCH 00/15] [POWERPC] TQM5200, CM5200 and Motion-PRO support Marian Balakowicz
2007-10-07 11:15 ` [PATCH 01/15] [POWERPC] TQM5200 DTS Marian Balakowicz
2007-10-07 17:36 ` Grant Likely
2007-10-07 20:30 ` Wolfgang Denk
2007-10-17 11:10 ` Marian Balakowicz
2007-10-17 14:57 ` Grant Likely
2007-10-08 6:27 ` Grant Likely
2007-10-08 13:52 ` Kumar Gala
2007-10-07 11:18 ` [PATCH 02/15] [POWERPC] TQM5200 defconfig Marian Balakowicz
2007-10-07 11:19 ` [POWERPC 03/15] [POWERPC] TQM5200 board support Marian Balakowicz
2007-10-07 12:21 ` Stephen Rothwell
2007-10-08 6:21 ` Grant Likely
2007-10-08 7:44 ` Wolfgang Denk
2007-10-08 7:54 ` Grant Likely
2007-10-08 20:48 ` Grant Likely
2007-10-08 22:32 ` Wolfgang Denk
2007-10-08 22:37 ` Grant Likely
2007-10-17 11:24 ` Marian Balakowicz
2007-10-08 15:04 ` Scott Wood
2007-10-17 11:42 ` Marian Balakowicz
2007-10-17 15:33 ` Scott Wood
2007-10-07 11:20 ` [PATCH 04/15] [POWERPC] CM5200 DTS Marian Balakowicz
2007-10-08 1:50 ` David Gibson
2007-10-17 12:22 ` Marian Balakowicz
2007-10-17 14:59 ` Grant Likely
2007-10-18 0:22 ` David Gibson
2007-10-19 11:06 ` Marian Balakowicz
2007-10-07 11:22 ` [PATCH 05/15] [POWERPC] CM5200 defconfig Marian Balakowicz
2007-10-07 11:24 ` [PATCH 06/15] [POWERPC] CM5200 board support Marian Balakowicz
2007-10-07 12:29 ` Stephen Rothwell
2007-10-08 6:28 ` Grant Likely
2007-10-07 11:25 ` [PATCH 07/15] [POWERPC] Promess Motion-PRO DTS Marian Balakowicz
2007-10-08 1:53 ` David Gibson
2007-10-08 6:44 ` Grant Likely
2007-10-08 14:58 ` Scott Wood
2007-10-08 15:16 ` Grant Likely
2007-10-18 12:50 ` Wolfgang Grandegger
2007-10-18 12:54 ` David Gibson
2007-10-18 13:16 ` Grant Likely
2007-10-07 11:26 ` [PATCH 08/15] [POWERPC] Promess Motion-PRO defconfig Marian Balakowicz
2007-10-07 11:28 ` [PATCH 09/15] [POWERPC] Promess Motion-PRO board support Marian Balakowicz
2007-10-07 12:32 ` Stephen Rothwell
2007-10-08 6:45 ` Grant Likely
2007-10-07 11:30 ` [PATCH 10/15] [POWERPC] Add mpc52xx_find_and_map_path(), refactor utility functions Marian Balakowicz
2007-10-08 6:47 ` Grant Likely
2007-10-07 11:31 ` [PATCH 11/15] [POWERPC] Motion-PRO: Add LED support Marian Balakowicz
2007-10-08 7:10 ` Grant Likely
2007-10-07 11:32 ` Marian Balakowicz [this message]
2007-10-08 7:15 ` [PATCH 12/15] [POWERPC] Add mpc52xx_restart(), mpc52xx_halt(), mpc52xx_power_off() Grant Likely
2007-10-08 13:56 ` Kumar Gala
2007-10-07 11:32 ` [PATCH 13/15] [POWERPC] Init restart/halt/power_off machine hooks for TQM5200 Marian Balakowicz
2007-10-07 11:35 ` [PATCH 14/15] [POWERPC] Init restart/halt/power_off machine hooks for CM5200 Marian Balakowicz
2007-10-07 11:36 ` [PATCH 15/15] [POWERPC] Init restart/halt/power_off machine hooks for Motion-PRO Marian Balakowicz
2007-10-08 7:16 ` [PATCH 00/15] [POWERPC] TQM5200, CM5200 and Motion-PRO support Grant Likely
2007-10-08 13:57 ` Kumar Gala
2007-10-09 9:08 ` Marian Balakowicz
2007-10-09 14:38 ` Grant Likely
2007-10-09 15:57 ` Kumar Gala
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