1 files changed, 167 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/prcm.c b/arch/arm/mach-omap2/prcm.c
new file mode 100644
index 00000000000..2e40a5cf016
--- /dev/null
+++ b/arch/arm/mach-omap2/prcm.c
@@ -0,0 +1,167 @@
+/*
+ * linux/arch/arm/mach-omap2/prcm.c
+ *
+ * OMAP 24xx Power Reset and Clock Management (PRCM) functions
+ *
+ * Copyright (C) 2005 Nokia Corporation
+ *
+ * Written by Tony Lindgren <tony.lindgren@nokia.com>
+ *
+ * Copyright (C) 2007 Texas Instruments, Inc.
+ * Rajendra Nayak <rnayak@ti.com>
+ *
+ * Some pieces of code Copyright (C) 2005 Texas Instruments, Inc.
+ * Upgraded with OMAP4 support by Abhijit Pagare <abhijitpagare@ti.com>
+ *
+ * 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/init.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/delay.h>
+
+#include <mach/system.h>
+#include <plat/common.h>
+#include <plat/prcm.h>
+#include <plat/irqs.h>
+
+#include "clock.h"
+#include "clock2xxx.h"
+#include "cm2xxx_3xxx.h"
+#include "prm2xxx_3xxx.h"
+#include "prm44xx.h"
+#include "prminst44xx.h"
+#include "prm-regbits-24xx.h"
+#include "prm-regbits-44xx.h"
+#include "control.h"
+
+void __iomem *prm_base;
+void __iomem *cm_base;
+void __iomem *cm2_base;
+
+#define MAX_MODULE_ENABLE_WAIT          100000
+
+u32 omap_prcm_get_reset_sources(void)
+{
+        /* XXX This presumably needs modification for 34XX */
+        if (cpu_is_omap24xx() || cpu_is_omap34xx())
+                return omap2_prm_read_mod_reg(WKUP_MOD, OMAP2_RM_RSTST) & 0x7f;
+        if (cpu_is_omap44xx())
+                return omap2_prm_read_mod_reg(WKUP_MOD, OMAP4_RM_RSTST) & 0x7f;
+
+        return 0;
+}
+EXPORT_SYMBOL(omap_prcm_get_reset_sources);
+
+/* Resets clock rates and reboots the system. Only called from system.h */
+static void omap_prcm_arch_reset(char mode, const char *cmd)
+{
+        s16 prcm_offs = 0;
+
+        if (cpu_is_omap24xx()) {
+                omap2xxx_clk_prepare_for_reboot();
+
+                prcm_offs = WKUP_MOD;
+        } else if (cpu_is_omap34xx()) {
+                prcm_offs = OMAP3430_GR_MOD;
+                omap3_ctrl_write_boot_mode((cmd ? (u8)*cmd : 0));
+        } else if (cpu_is_omap44xx()) {
+                omap4_prminst_global_warm_sw_reset(); /* never returns */
+        } else {
+                WARN_ON(1);
+        }
+
+        /*
+         * As per Errata i520, in some cases, user will not be able to
+         * access DDR memory after warm-reset.
+         * This situation occurs while the warm-reset happens during a read
+         * access to DDR memory. In that particular condition, DDR memory
+         * does not respond to a corrupted read command due to the warm
+         * reset occurrence but SDRC is waiting for read completion.
+         * SDRC is not sensitive to the warm reset, but the interconnect is
+         * reset on the fly, thus causing a misalignment between SDRC logic,
+         * interconnect logic and DDR memory state.
+         * WORKAROUND:
+         * Steps to perform before a Warm reset is trigged:
+         * 1. enable self-refresh on idle request
+         * 2. put SDRC in idle
+         * 3. wait until SDRC goes to idle
+         * 4. generate SW reset (Global SW reset)
+         *
+         * Steps to be performed after warm reset occurs (in bootloader):
+         * if HW warm reset is the source, apply below steps before any
+         * accesses to SDRAM:
+         * 1. Reset SMS and SDRC and wait till reset is complete
+         * 2. Re-initialize SMS, SDRC and memory
+         *
+         * NOTE: Above work around is required only if arch reset is implemented
+         * using Global SW reset(GLOBAL_SW_RST). DPLL3 reset does not need
+         * the WA since it resets SDRC as well as part of cold reset.
+         */
+
+        /* XXX should be moved to some OMAP2/3 specific code */
+        omap2_prm_set_mod_reg_bits(OMAP_RST_DPLL3_MASK, prcm_offs,
+                                   OMAP2_RM_RSTCTRL);
+        omap2_prm_read_mod_reg(prcm_offs, OMAP2_RM_RSTCTRL); /* OCP barrier */
+}
+
+void (*arch_reset)(char, const char *) = omap_prcm_arch_reset;
+
+/**
+ * omap2_cm_wait_idlest - wait for IDLEST bit to indicate module readiness
+ * @reg: physical address of module IDLEST register
+ * @mask: value to mask against to determine if the module is active
+ * @idlest: idle state indicator (0 or 1) for the clock
+ * @name: name of the clock (for printk)
+ *
+ * Returns 1 if the module indicated readiness in time, or 0 if it
+ * failed to enable in roughly MAX_MODULE_ENABLE_WAIT microseconds.
+ *
+ * XXX This function is deprecated.  It should be removed once the
+ * hwmod conversion is complete.
+ */
+int omap2_cm_wait_idlest(void __iomem *reg, u32 mask, u8 idlest,
+                                const char *name)
+{
+        int i = 0;
+        int ena = 0;
+
+        if (idlest)
+                ena = 0;
+        else
+                ena = mask;
+
+        /* Wait for lock */
+        omap_test_timeout(((__raw_readl(reg) & mask) == ena),
+                          MAX_MODULE_ENABLE_WAIT, i);
+
+        if (i < MAX_MODULE_ENABLE_WAIT)
+                pr_debug("cm: Module associated with clock %s ready after %d "
+                         "loops\n", name, i);
+        else
+                pr_err("cm: Module associated with clock %s didn't enable in "
+                       "%d tries\n", name, MAX_MODULE_ENABLE_WAIT);
+
+        return (i < MAX_MODULE_ENABLE_WAIT) ? 1 : 0;
+};
+
+void __init omap2_set_globals_prcm(struct omap_globals *omap2_globals)
+{
+        /* Static mapping, never released */
+        if (omap2_globals->prm) {
+                prm_base = ioremap(omap2_globals->prm, SZ_8K);
+                WARN_ON(!prm_base);
+        }
+        if (omap2_globals->cm) {
+                cm_base = ioremap(omap2_globals->cm, SZ_8K);
+                WARN_ON(!cm_base);
+        }
+        if (omap2_globals->cm2) {
+                cm2_base = ioremap(omap2_globals->cm2, SZ_8K);
+                WARN_ON(!cm2_base);
+        }
+}