[PATCH 07/11] OMAP4: PRM: add module hard reset support
Paul Walmsley
paul at pwsan.com
Tue Sep 21 12:34:49 EDT 2010
From: Benoît Cousson <b-cousson at ti.com>
Most processor modules (e.g., DSP, IVA, IPU) on OMAPs can be reset
under the control of the PRM. This patch adds an API for this purpose
for OMAP4 devices:
int omap4_prm_is_hardreset_asserted(void __iomem *rstctrl_reg, u8 shift);
int omap4_prm_assert_hardreset(void __iomem *rstctrl_reg, u8 shift);
int omap4_prm_deassert_hardreset(void __iomem *rstctrl_reg, u8 shift);
This API is intended to be used only by the hwmod code - a subsequent
patch will add that support to hwmod.
This patch is a collaboration between Benoît Cousson <b-cousson at ti.com>
and Paul Walmsley <paul at pwsan.com>.
Signed-off-by: Paul Walmsley <paul at pwsan.com>
Signed-off-by: Benoît Cousson <b-cousson at ti.com>
---
arch/arm/mach-omap2/Makefile | 2 -
arch/arm/mach-omap2/prm.h | 13 ++++-
arch/arm/mach-omap2/prm44xx.c | 116 +++++++++++++++++++++++++++++++++++++++++
3 files changed, 129 insertions(+), 2 deletions(-)
create mode 100644 arch/arm/mach-omap2/prm44xx.c
diff --git a/arch/arm/mach-omap2/Makefile b/arch/arm/mach-omap2/Makefile
index 88d3a1e..c0da784 100644
--- a/arch/arm/mach-omap2/Makefile
+++ b/arch/arm/mach-omap2/Makefile
@@ -15,7 +15,7 @@ clock-common = clock.o clock_common_data.o \
obj-$(CONFIG_ARCH_OMAP2) += $(omap-2-3-common) $(prcm-common) $(hwmod-common)
obj-$(CONFIG_ARCH_OMAP3) += $(omap-2-3-common) $(prcm-common) $(hwmod-common)
-obj-$(CONFIG_ARCH_OMAP4) += $(prcm-common) $(hwmod-common)
+obj-$(CONFIG_ARCH_OMAP4) += $(prcm-common) prm44xx.o $(hwmod-common)
obj-$(CONFIG_OMAP_MCBSP) += mcbsp.o
diff --git a/arch/arm/mach-omap2/prm.h b/arch/arm/mach-omap2/prm.h
index 588873b..bc7e6e6 100644
--- a/arch/arm/mach-omap2/prm.h
+++ b/arch/arm/mach-omap2/prm.h
@@ -5,7 +5,7 @@
* OMAP2/3 Power/Reset Management (PRM) register definitions
*
* Copyright (C) 2007-2009 Texas Instruments, Inc.
- * Copyright (C) 2009 Nokia Corporation
+ * Copyright (C) 2010 Nokia Corporation
*
* Written by Paul Walmsley
*
@@ -246,6 +246,10 @@ static inline u32 prm_clear_mod_reg_bits(u32 bits, s16 module, s16 idx)
return prm_rmw_mod_reg_bits(bits, 0x0, module, idx);
}
+int omap4_prm_is_hardreset_asserted(void __iomem *rstctrl_reg, u8 shift);
+int omap4_prm_assert_hardreset(void __iomem *rstctrl_reg, u8 shift);
+int omap4_prm_deassert_hardreset(void __iomem *rstctrl_reg, u8 shift);
+
#endif
/*
@@ -398,4 +402,11 @@ static inline u32 prm_clear_mod_reg_bits(u32 bits, s16 module, s16 idx)
#define OMAP_POWERSTATE_MASK (0x3 << 0)
+/*
+ * MAX_MODULE_HARDRESET_WAIT: Maximum microseconds to wait for an OMAP
+ * submodule to exit hardreset
+ */
+#define MAX_MODULE_HARDRESET_WAIT 10000
+
+
#endif
diff --git a/arch/arm/mach-omap2/prm44xx.c b/arch/arm/mach-omap2/prm44xx.c
new file mode 100644
index 0000000..a1ff918
--- /dev/null
+++ b/arch/arm/mach-omap2/prm44xx.c
@@ -0,0 +1,116 @@
+/*
+ * OMAP4 PRM module functions
+ *
+ * Copyright (C) 2010 Texas Instruments, Inc.
+ * Copyright (C) 2010 Nokia Corporation
+ * Benoît Cousson
+ * Paul Walmsley
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/err.h>
+
+#include <plat/common.h>
+#include <plat/cpu.h>
+#include <plat/prcm.h>
+
+#include "prm.h"
+#include "prm-regbits-44xx.h"
+
+/*
+ * Address offset (in bytes) between the reset control and the reset
+ * status registers: 4 bytes on OMAP4
+ */
+#define OMAP4_RST_CTRL_ST_OFFSET 4
+
+/**
+ * omap4_prm_is_hardreset_asserted - read the HW reset line state of
+ * submodules contained in the hwmod module
+ * @rstctrl_reg: RM_RSTCTRL register address for this module
+ * @shift: register bit shift corresponding to the reset line to check
+ *
+ * Returns 1 if the (sub)module hardreset line is currently asserted,
+ * 0 if the (sub)module hardreset line is not currently asserted, or
+ * -EINVAL upon parameter error.
+ */
+int omap4_prm_is_hardreset_asserted(void __iomem *rstctrl_reg, u8 shift)
+{
+ if (!cpu_is_omap44xx() || !rstctrl_reg)
+ return -EINVAL;
+
+ return omap4_prm_read_bits_shift(rstctrl_reg, (1 << shift));
+}
+
+/**
+ * omap4_prm_assert_hardreset - assert the HW reset line of a submodule
+ * @rstctrl_reg: RM_RSTCTRL register address for this module
+ * @shift: register bit shift corresponding to the reset line to assert
+ *
+ * Some IPs like dsp, ipu or iva contain processors that require an HW
+ * reset line to be asserted / deasserted in order to fully enable the
+ * IP. These modules may have multiple hard-reset lines that reset
+ * different 'submodules' inside the IP block. This function will
+ * place the submodule into reset. Returns 0 upon success or -EINVAL
+ * upon an argument error.
+ */
+int omap4_prm_assert_hardreset(void __iomem *rstctrl_reg, u8 shift)
+{
+ u32 mask;
+
+ if (!cpu_is_omap44xx() || !rstctrl_reg)
+ return -EINVAL;
+
+ mask = 1 << shift;
+ omap4_prm_rmw_reg_bits(mask, mask, rstctrl_reg);
+
+ return 0;
+}
+
+/**
+ * omap4_prm_deassert_hardreset - deassert a submodule hardreset line and wait
+ * @rstctrl_reg: RM_RSTCTRL register address for this module
+ * @shift: register bit shift corresponding to the reset line to deassert
+ *
+ * Some IPs like dsp, ipu or iva contain processors that require an HW
+ * reset line to be asserted / deasserted in order to fully enable the
+ * IP. These modules may have multiple hard-reset lines that reset
+ * different 'submodules' inside the IP block. This function will
+ * take the submodule out of reset and wait until the PRCM indicates
+ * that the reset has completed before returning. Returns 0 upon success or
+ * -EINVAL upon an argument error, -EEXIST if the submodule was already out
+ * of reset, or -EBUSY if the submodule did not exit reset promptly.
+ */
+int omap4_prm_deassert_hardreset(void __iomem *rstctrl_reg, u8 shift)
+{
+ u32 mask;
+ void __iomem *rstst_reg;
+ int c;
+
+ if (!cpu_is_omap44xx() || !rstctrl_reg)
+ return -EINVAL;
+
+ rstst_reg = rstctrl_reg + OMAP4_RST_CTRL_ST_OFFSET;
+
+ mask = 1 << shift;
+
+ /* Check the current status to avoid de-asserting the line twice */
+ if (omap4_prm_read_bits_shift(rstctrl_reg, mask) == 0)
+ return -EEXIST;
+
+ /* Clear the reset status by writing 1 to the status bit */
+ omap4_prm_rmw_reg_bits(0xffffffff, mask, rstst_reg);
+ /* de-assert the reset control line */
+ omap4_prm_rmw_reg_bits(mask, 0, rstctrl_reg);
+ /* wait the status to be set */
+ omap_test_timeout(omap4_prm_read_bits_shift(rstst_reg, mask),
+ MAX_MODULE_HARDRESET_WAIT, c);
+
+ return (c == MAX_MODULE_HARDRESET_WAIT) ? -EBUSY : 0;
+}
+
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