Initial import

1 files changed, 196 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/prminst44xx.c b/arch/arm/mach-omap2/prminst44xx.c
new file mode 100644
index 000000000..d0b15dbaf
--- /dev/null
+++ b/arch/arm/mach-omap2/prminst44xx.c
@@ -0,0 +1,196 @@
+/*
+ * OMAP4 PRM instance functions
+ *
+ * Copyright (C) 2009 Nokia Corporation
+ * Copyright (C) 2011 Texas Instruments, Inc.
+ * 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/types.h>
+#include <linux/errno.h>
+#include <linux/err.h>
+#include <linux/io.h>
+
+#include "iomap.h"
+#include "common.h"
+#include "prcm-common.h"
+#include "prm44xx.h"
+#include "prm54xx.h"
+#include "prm7xx.h"
+#include "prminst44xx.h"
+#include "prm-regbits-44xx.h"
+#include "prcm44xx.h"
+#include "prcm43xx.h"
+#include "prcm_mpu44xx.h"
+#include "soc.h"
+
+static void __iomem *_prm_bases[OMAP4_MAX_PRCM_PARTITIONS];
+
+static s32 prm_dev_inst = PRM_INSTANCE_UNKNOWN;
+
+/**
+ * omap_prm_base_init - Populates the prm partitions
+ *
+ * Populates the base addresses of the _prm_bases
+ * array used for read/write of prm module registers.
+ */
+void omap_prm_base_init(void)
+{
+	_prm_bases[OMAP4430_PRM_PARTITION] = prm_base;
+	_prm_bases[OMAP4430_PRCM_MPU_PARTITION] = prcm_mpu_base;
+}
+
+s32 omap4_prmst_get_prm_dev_inst(void)
+{
+	return prm_dev_inst;
+}
+
+void omap4_prminst_set_prm_dev_inst(s32 dev_inst)
+{
+	prm_dev_inst = dev_inst;
+}
+
+/* Read a register in a PRM instance */
+u32 omap4_prminst_read_inst_reg(u8 part, s16 inst, u16 idx)
+{
+	BUG_ON(part >= OMAP4_MAX_PRCM_PARTITIONS ||
+	       part == OMAP4430_INVALID_PRCM_PARTITION ||
+	       !_prm_bases[part]);
+	return readl_relaxed(_prm_bases[part] + inst + idx);
+}
+
+/* Write into a register in a PRM instance */
+void omap4_prminst_write_inst_reg(u32 val, u8 part, s16 inst, u16 idx)
+{
+	BUG_ON(part >= OMAP4_MAX_PRCM_PARTITIONS ||
+	       part == OMAP4430_INVALID_PRCM_PARTITION ||
+	       !_prm_bases[part]);
+	writel_relaxed(val, _prm_bases[part] + inst + idx);
+}
+
+/* Read-modify-write a register in PRM. Caller must lock */
+u32 omap4_prminst_rmw_inst_reg_bits(u32 mask, u32 bits, u8 part, s16 inst,
+				    u16 idx)
+{
+	u32 v;
+
+	v = omap4_prminst_read_inst_reg(part, inst, idx);
+	v &= ~mask;
+	v |= bits;
+	omap4_prminst_write_inst_reg(v, part, inst, idx);
+
+	return v;
+}
+
+/**
+ * omap4_prminst_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_prminst_is_hardreset_asserted(u8 shift, u8 part, s16 inst,
+					u16 rstctrl_offs)
+{
+	u32 v;
+
+	v = omap4_prminst_read_inst_reg(part, inst, rstctrl_offs);
+	v &= 1 << shift;
+	v >>= shift;
+
+	return v;
+}
+
+/**
+ * omap4_prminst_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_prminst_assert_hardreset(u8 shift, u8 part, s16 inst,
+				   u16 rstctrl_offs)
+{
+	u32 mask = 1 << shift;
+
+	omap4_prminst_rmw_inst_reg_bits(mask, mask, part, inst, rstctrl_offs);
+
+	return 0;
+}
+
+/**
+ * omap4_prminst_deassert_hardreset - deassert a submodule hardreset line and
+ * wait
+ * @shift: register bit shift corresponding to the reset line to deassert
+ * @st_shift: status bit offset corresponding to the reset line
+ * @part: PRM partition
+ * @inst: PRM instance offset
+ * @rstctrl_offs: reset register offset
+ * @rstst_offs: reset status register offset
+ *
+ * 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_prminst_deassert_hardreset(u8 shift, u8 st_shift, u8 part, s16 inst,
+				     u16 rstctrl_offs, u16 rstst_offs)
+{
+	int c;
+	u32 mask = 1 << shift;
+	u32 st_mask = 1 << st_shift;
+
+	/* Check the current status to avoid de-asserting the line twice */
+	if (omap4_prminst_is_hardreset_asserted(shift, part, inst,
+						rstctrl_offs) == 0)
+		return -EEXIST;
+
+	/* Clear the reset status by writing 1 to the status bit */
+	omap4_prminst_rmw_inst_reg_bits(0xffffffff, st_mask, part, inst,
+					rstst_offs);
+	/* de-assert the reset control line */
+	omap4_prminst_rmw_inst_reg_bits(mask, 0, part, inst, rstctrl_offs);
+	/* wait the status to be set */
+	omap_test_timeout(omap4_prminst_is_hardreset_asserted(st_shift, part,
+							      inst, rstst_offs),
+			  MAX_MODULE_HARDRESET_WAIT, c);
+
+	return (c == MAX_MODULE_HARDRESET_WAIT) ? -EBUSY : 0;
+}
+
+
+void omap4_prminst_global_warm_sw_reset(void)
+{
+	u32 v;
+	s32 inst = omap4_prmst_get_prm_dev_inst();
+
+	if (inst == PRM_INSTANCE_UNKNOWN)
+		return;
+
+	v = omap4_prminst_read_inst_reg(OMAP4430_PRM_PARTITION, inst,
+					OMAP4_PRM_RSTCTRL_OFFSET);
+	v |= OMAP4430_RST_GLOBAL_WARM_SW_MASK;
+	omap4_prminst_write_inst_reg(v, OMAP4430_PRM_PARTITION,
+				 inst, OMAP4_PRM_RSTCTRL_OFFSET);
+
+	/* OCP barrier */
+	v = omap4_prminst_read_inst_reg(OMAP4430_PRM_PARTITION,
+				    inst, OMAP4_PRM_RSTCTRL_OFFSET);
+}