1 files changed, 219 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/prm2xxx.c b/arch/arm/mach-omap2/prm2xxx.c
new file mode 100644
index 000000000000..418de9c3b319
--- /dev/null
+++ b/arch/arm/mach-omap2/prm2xxx.c
@@ -0,0 +1,219 @@
+/*
+ * OMAP2xxx PRM module functions
+ *
+ * Copyright (C) 2010-2012 Texas Instruments, Inc.
+ * Copyright (C) 2010 Nokia Corporation
+ * Benoît Cousson
+ * Paul Walmsley
+ * Rajendra Nayak <rnayak@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/errno.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+
+#include "soc.h"
+#include "common.h"
+#include "vp.h"
+#include "powerdomain.h"
+#include "clockdomain.h"
+#include "prm2xxx.h"
+#include "cm2xxx_3xxx.h"
+#include "prm-regbits-24xx.h"
+
+/*
+ * OMAP24xx PM_PWSTCTRL_*.POWERSTATE and PM_PWSTST_*.LASTSTATEENTERED bits -
+ * these are reversed from the bits used on OMAP3+
+ */
+#define OMAP24XX_PWRDM_POWER_ON                 0x0
+#define OMAP24XX_PWRDM_POWER_RET                0x1
+#define OMAP24XX_PWRDM_POWER_OFF                0x3
+
+/*
+ * omap2xxx_prm_reset_src_map - map from bits in the PRM_RSTST_WKUP
+ *   hardware register (which are specific to the OMAP2xxx SoCs) to
+ *   reset source ID bit shifts (which is an OMAP SoC-independent
+ *   enumeration)
+ */
+static struct prm_reset_src_map omap2xxx_prm_reset_src_map[] = {
+        { OMAP_GLOBALCOLD_RST_SHIFT, OMAP_GLOBAL_COLD_RST_SRC_ID_SHIFT },
+        { OMAP_GLOBALWARM_RST_SHIFT, OMAP_GLOBAL_WARM_RST_SRC_ID_SHIFT },
+        { OMAP24XX_SECU_VIOL_RST_SHIFT, OMAP_SECU_VIOL_RST_SRC_ID_SHIFT },
+        { OMAP24XX_MPU_WD_RST_SHIFT, OMAP_MPU_WD_RST_SRC_ID_SHIFT },
+        { OMAP24XX_SECU_WD_RST_SHIFT, OMAP_SECU_WD_RST_SRC_ID_SHIFT },
+        { OMAP24XX_EXTWMPU_RST_SHIFT, OMAP_EXTWARM_RST_SRC_ID_SHIFT },
+        { -1, -1 },
+};
+
+/**
+ * omap2xxx_prm_read_reset_sources - return the last SoC reset source
+ *
+ * Return a u32 representing the last reset sources of the SoC.  The
+ * returned reset source bits are standardized across OMAP SoCs.
+ */
+static u32 omap2xxx_prm_read_reset_sources(void)
+{
+        struct prm_reset_src_map *p;
+        u32 r = 0;
+        u32 v;
+
+        v = omap2_prm_read_mod_reg(WKUP_MOD, OMAP2_RM_RSTST);
+
+        p = omap2xxx_prm_reset_src_map;
+        while (p->reg_shift >= 0 && p->std_shift >= 0) {
+                if (v & (1 << p->reg_shift))
+                        r |= 1 << p->std_shift;
+                p++;
+        }
+
+        return r;
+}
+
+/**
+ * omap2xxx_pwrst_to_common_pwrst - convert OMAP2xxx pwrst to common pwrst
+ * @omap2xxx_pwrst: OMAP2xxx hardware power state to convert
+ *
+ * Return the common power state bits corresponding to the OMAP2xxx
+ * hardware power state bits @omap2xxx_pwrst, or -EINVAL upon error.
+ */
+static int omap2xxx_pwrst_to_common_pwrst(u8 omap2xxx_pwrst)
+{
+        u8 pwrst;
+
+        switch (omap2xxx_pwrst) {
+        case OMAP24XX_PWRDM_POWER_OFF:
+                pwrst = PWRDM_POWER_OFF;
+                break;
+        case OMAP24XX_PWRDM_POWER_RET:
+                pwrst = PWRDM_POWER_RET;
+                break;
+        case OMAP24XX_PWRDM_POWER_ON:
+                pwrst = PWRDM_POWER_ON;
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        return pwrst;
+}
+
+/**
+ * omap2xxx_prm_dpll_reset - use DPLL reset to reboot the OMAP SoC
+ *
+ * Set the DPLL reset bit, which should reboot the SoC.  This is the
+ * recommended way to restart the SoC.  No return value.
+ */
+void omap2xxx_prm_dpll_reset(void)
+{
+        omap2_prm_set_mod_reg_bits(OMAP_RST_DPLL3_MASK, WKUP_MOD,
+                                   OMAP2_RM_RSTCTRL);
+        /* OCP barrier */
+        omap2_prm_read_mod_reg(WKUP_MOD, OMAP2_RM_RSTCTRL);
+}
+
+int omap2xxx_clkdm_sleep(struct clockdomain *clkdm)
+{
+        omap2_prm_set_mod_reg_bits(OMAP24XX_FORCESTATE_MASK,
+                                   clkdm->pwrdm.ptr->prcm_offs,
+                                   OMAP2_PM_PWSTCTRL);
+        return 0;
+}
+
+int omap2xxx_clkdm_wakeup(struct clockdomain *clkdm)
+{
+        omap2_prm_clear_mod_reg_bits(OMAP24XX_FORCESTATE_MASK,
+                                     clkdm->pwrdm.ptr->prcm_offs,
+                                     OMAP2_PM_PWSTCTRL);
+        return 0;
+}
+
+static int omap2xxx_pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst)
+{
+        u8 omap24xx_pwrst;
+
+        switch (pwrst) {
+        case PWRDM_POWER_OFF:
+                omap24xx_pwrst = OMAP24XX_PWRDM_POWER_OFF;
+                break;
+        case PWRDM_POWER_RET:
+                omap24xx_pwrst = OMAP24XX_PWRDM_POWER_RET;
+                break;
+        case PWRDM_POWER_ON:
+                omap24xx_pwrst = OMAP24XX_PWRDM_POWER_ON;
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        omap2_prm_rmw_mod_reg_bits(OMAP_POWERSTATE_MASK,
+                                   (omap24xx_pwrst << OMAP_POWERSTATE_SHIFT),
+                                   pwrdm->prcm_offs, OMAP2_PM_PWSTCTRL);
+        return 0;
+}
+
+static int omap2xxx_pwrdm_read_next_pwrst(struct powerdomain *pwrdm)
+{
+        u8 omap2xxx_pwrst;
+
+        omap2xxx_pwrst = omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs,
+                                                       OMAP2_PM_PWSTCTRL,
+                                                       OMAP_POWERSTATE_MASK);
+
+        return omap2xxx_pwrst_to_common_pwrst(omap2xxx_pwrst);
+}
+
+static int omap2xxx_pwrdm_read_pwrst(struct powerdomain *pwrdm)
+{
+        u8 omap2xxx_pwrst;
+
+        omap2xxx_pwrst = omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs,
+                                                       OMAP2_PM_PWSTST,
+                                                       OMAP_POWERSTATEST_MASK);
+
+        return omap2xxx_pwrst_to_common_pwrst(omap2xxx_pwrst);
+}
+
+struct pwrdm_ops omap2_pwrdm_operations = {
+        .pwrdm_set_next_pwrst   = omap2xxx_pwrdm_set_next_pwrst,
+        .pwrdm_read_next_pwrst  = omap2xxx_pwrdm_read_next_pwrst,
+        .pwrdm_read_pwrst       = omap2xxx_pwrdm_read_pwrst,
+        .pwrdm_set_logic_retst  = omap2_pwrdm_set_logic_retst,
+        .pwrdm_set_mem_onst     = omap2_pwrdm_set_mem_onst,
+        .pwrdm_set_mem_retst    = omap2_pwrdm_set_mem_retst,
+        .pwrdm_read_mem_pwrst   = omap2_pwrdm_read_mem_pwrst,
+        .pwrdm_read_mem_retst   = omap2_pwrdm_read_mem_retst,
+        .pwrdm_wait_transition  = omap2_pwrdm_wait_transition,
+};
+
+/*
+ *
+ */
+
+static struct prm_ll_data omap2xxx_prm_ll_data = {
+        .read_reset_sources = &omap2xxx_prm_read_reset_sources,
+};
+
+int __init omap2xxx_prm_init(void)
+{
+        if (!cpu_is_omap24xx())
+                return 0;
+
+        return prm_register(&omap2xxx_prm_ll_data);
+}
+
+static void __exit omap2xxx_prm_exit(void)
+{
+        if (!cpu_is_omap24xx())
+                return;
+
+        /* Should never happen */
+        WARN(prm_unregister(&omap2xxx_prm_ll_data),
+             "%s: prm_ll_data function pointer mismatch\n", __func__);
+}
+__exitcall(omap2xxx_prm_exit);