arch/arm/mach-omap2/prm44xx.c

   1 /*
   2  * OMAP4 PRM module functions
   3  *
   4  * Copyright (C) 2011 Texas Instruments, Inc.
   5  * Copyright (C) 2010 Nokia Corporation
   6  * Benoît Cousson
   7  * Paul Walmsley
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/delay.h>
  16 #include <linux/errno.h>
  17 #include <linux/err.h>
  18 #include <linux/io.h>
  19
  20 #include <plat/cpu.h>
  21 #include <plat/prcm.h>
  22
  23 #include "iomap.h"
  24 #include "common.h"
  25 #include "vp.h"
  26 #include "prm44xx.h"
  27 #include "prm-regbits-44xx.h"
  28 #include "prcm44xx.h"
  29 #include "prminst44xx.h"
  30
  31 static const struct omap_prcm_irq omap4_prcm_irqs[] = {
  32         OMAP_PRCM_IRQ("wkup",   0,      0),
  33         OMAP_PRCM_IRQ("io",     9,      1),
  34 };
  35
  36 static struct omap_prcm_irq_setup omap4_prcm_irq_setup = {
  37         .ack                    = OMAP4_PRM_IRQSTATUS_MPU_OFFSET,
  38         .mask                   = OMAP4_PRM_IRQENABLE_MPU_OFFSET,
  39         .nr_regs                = 2,
  40         .irqs                   = omap4_prcm_irqs,
  41         .nr_irqs                = ARRAY_SIZE(omap4_prcm_irqs),
  42         .irq                    = OMAP44XX_IRQ_PRCM,
  43         .read_pending_irqs      = &omap44xx_prm_read_pending_irqs,
  44         .ocp_barrier            = &omap44xx_prm_ocp_barrier,
  45         .save_and_clear_irqen   = &omap44xx_prm_save_and_clear_irqen,
  46         .restore_irqen          = &omap44xx_prm_restore_irqen,
  47 };
  48
  49 /* PRM low-level functions */
  50
  51 /* Read a register in a CM/PRM instance in the PRM module */
  52 u32 omap4_prm_read_inst_reg(s16 inst, u16 reg)
  53 {
  54         return __raw_readl(OMAP44XX_PRM_REGADDR(inst, reg));
  55 }
  56
  57 /* Write into a register in a CM/PRM instance in the PRM module */
  58 void omap4_prm_write_inst_reg(u32 val, s16 inst, u16 reg)
  59 {
  60         __raw_writel(val, OMAP44XX_PRM_REGADDR(inst, reg));
  61 }
  62
  63 /* Read-modify-write a register in a PRM module. Caller must lock */
  64 u32 omap4_prm_rmw_inst_reg_bits(u32 mask, u32 bits, s16 inst, s16 reg)
  65 {
  66         u32 v;
  67
  68         v = omap4_prm_read_inst_reg(inst, reg);
  69         v &= ~mask;
  70         v |= bits;
  71         omap4_prm_write_inst_reg(v, inst, reg);
  72
  73         return v;
  74 }
  75
  76 /* PRM VP */
  77
  78 /*
  79  * struct omap4_vp - OMAP4 VP register access description.
  80  * @irqstatus_mpu: offset to IRQSTATUS_MPU register for VP
  81  * @tranxdone_status: VP_TRANXDONE_ST bitmask in PRM_IRQSTATUS_MPU reg
  82  */
  83 struct omap4_vp {
  84         u32 irqstatus_mpu;
  85         u32 tranxdone_status;
  86 };
  87
  88 static struct omap4_vp omap4_vp[] = {
  89         [OMAP4_VP_VDD_MPU_ID] = {
  90                 .irqstatus_mpu = OMAP4_PRM_IRQSTATUS_MPU_2_OFFSET,
  91                 .tranxdone_status = OMAP4430_VP_MPU_TRANXDONE_ST_MASK,
  92         },
  93         [OMAP4_VP_VDD_IVA_ID] = {
  94                 .irqstatus_mpu = OMAP4_PRM_IRQSTATUS_MPU_OFFSET,
  95                 .tranxdone_status = OMAP4430_VP_IVA_TRANXDONE_ST_MASK,
  96         },
  97         [OMAP4_VP_VDD_CORE_ID] = {
  98                 .irqstatus_mpu = OMAP4_PRM_IRQSTATUS_MPU_OFFSET,
  99                 .tranxdone_status = OMAP4430_VP_CORE_TRANXDONE_ST_MASK,
 100         },
 101 };
 102
 103 u32 omap4_prm_vp_check_txdone(u8 vp_id)
 104 {
 105         struct omap4_vp *vp = &omap4_vp[vp_id];
 106         u32 irqstatus;
 107
 108         irqstatus = omap4_prminst_read_inst_reg(OMAP4430_PRM_PARTITION,
 109                                                 OMAP4430_PRM_OCP_SOCKET_INST,
 110                                                 vp->irqstatus_mpu);
 111         return irqstatus & vp->tranxdone_status;
 112 }
 113
 114 void omap4_prm_vp_clear_txdone(u8 vp_id)
 115 {
 116         struct omap4_vp *vp = &omap4_vp[vp_id];
 117
 118         omap4_prminst_write_inst_reg(vp->tranxdone_status,
 119                                      OMAP4430_PRM_PARTITION,
 120                                      OMAP4430_PRM_OCP_SOCKET_INST,
 121                                      vp->irqstatus_mpu);
 122 };
 123
 124 u32 omap4_prm_vcvp_read(u8 offset)
 125 {
 126         return omap4_prminst_read_inst_reg(OMAP4430_PRM_PARTITION,
 127                                            OMAP4430_PRM_DEVICE_INST, offset);
 128 }
 129
 130 void omap4_prm_vcvp_write(u32 val, u8 offset)
 131 {
 132         omap4_prminst_write_inst_reg(val, OMAP4430_PRM_PARTITION,
 133                                      OMAP4430_PRM_DEVICE_INST, offset);
 134 }
 135
 136 u32 omap4_prm_vcvp_rmw(u32 mask, u32 bits, u8 offset)
 137 {
 138         return omap4_prminst_rmw_inst_reg_bits(mask, bits,
 139                                                OMAP4430_PRM_PARTITION,
 140                                                OMAP4430_PRM_DEVICE_INST,
 141                                                offset);
 142 }
 143
 144 static inline u32 _read_pending_irq_reg(u16 irqen_offs, u16 irqst_offs)
 145 {
 146         u32 mask, st;
 147
 148         /* XXX read mask from RAM? */
 149         mask = omap4_prm_read_inst_reg(OMAP4430_PRM_DEVICE_INST, irqen_offs);
 150         st = omap4_prm_read_inst_reg(OMAP4430_PRM_DEVICE_INST, irqst_offs);
 151
 152         return mask & st;
 153 }
 154
 155 /**
 156  * omap44xx_prm_read_pending_irqs - read pending PRM MPU IRQs into @events
 157  * @events: ptr to two consecutive u32s, preallocated by caller
 158  *
 159  * Read PRM_IRQSTATUS_MPU* bits, AND'ed with the currently-enabled PRM
 160  * MPU IRQs, and store the result into the two u32s pointed to by @events.
 161  * No return value.
 162  */
 163 void omap44xx_prm_read_pending_irqs(unsigned long *events)
 164 {
 165         events[0] = _read_pending_irq_reg(OMAP4_PRM_IRQENABLE_MPU_OFFSET,
 166                                           OMAP4_PRM_IRQSTATUS_MPU_OFFSET);
 167
 168         events[1] = _read_pending_irq_reg(OMAP4_PRM_IRQENABLE_MPU_2_OFFSET,
 169                                           OMAP4_PRM_IRQSTATUS_MPU_2_OFFSET);
 170 }
 171
 172 /**
 173  * omap44xx_prm_ocp_barrier - force buffered MPU writes to the PRM to complete
 174  *
 175  * Force any buffered writes to the PRM IP block to complete.  Needed
 176  * by the PRM IRQ handler, which reads and writes directly to the IP
 177  * block, to avoid race conditions after acknowledging or clearing IRQ
 178  * bits.  No return value.
 179  */
 180 void omap44xx_prm_ocp_barrier(void)
 181 {
 182         omap4_prm_read_inst_reg(OMAP4430_PRM_DEVICE_INST,
 183                                 OMAP4_REVISION_PRM_OFFSET);
 184 }
 185
 186 /**
 187  * omap44xx_prm_save_and_clear_irqen - save/clear PRM_IRQENABLE_MPU* regs
 188  * @saved_mask: ptr to a u32 array to save IRQENABLE bits
 189  *
 190  * Save the PRM_IRQENABLE_MPU and PRM_IRQENABLE_MPU_2 registers to
 191  * @saved_mask.  @saved_mask must be allocated by the caller.
 192  * Intended to be used in the PRM interrupt handler suspend callback.
 193  * The OCP barrier is needed to ensure the write to disable PRM
 194  * interrupts reaches the PRM before returning; otherwise, spurious
 195  * interrupts might occur.  No return value.
 196  */
 197 void omap44xx_prm_save_and_clear_irqen(u32 *saved_mask)
 198 {
 199         saved_mask[0] =
 200                 omap4_prm_read_inst_reg(OMAP4430_PRM_DEVICE_INST,
 201                                         OMAP4_PRM_IRQSTATUS_MPU_OFFSET);
 202         saved_mask[1] =
 203                 omap4_prm_read_inst_reg(OMAP4430_PRM_DEVICE_INST,
 204                                         OMAP4_PRM_IRQSTATUS_MPU_2_OFFSET);
 205
 206         omap4_prm_write_inst_reg(0, OMAP4430_PRM_DEVICE_INST,
 207                                  OMAP4_PRM_IRQENABLE_MPU_OFFSET);
 208         omap4_prm_write_inst_reg(0, OMAP4430_PRM_DEVICE_INST,
 209                                  OMAP4_PRM_IRQENABLE_MPU_2_OFFSET);
 210
 211         /* OCP barrier */
 212         omap4_prm_read_inst_reg(OMAP4430_PRM_DEVICE_INST,
 213                                 OMAP4_REVISION_PRM_OFFSET);
 214 }
 215
 216 /**
 217  * omap44xx_prm_restore_irqen - set PRM_IRQENABLE_MPU* registers from args
 218  * @saved_mask: ptr to a u32 array of IRQENABLE bits saved previously
 219  *
 220  * Restore the PRM_IRQENABLE_MPU and PRM_IRQENABLE_MPU_2 registers from
 221  * @saved_mask.  Intended to be used in the PRM interrupt handler resume
 222  * callback to restore values saved by omap44xx_prm_save_and_clear_irqen().
 223  * No OCP barrier should be needed here; any pending PRM interrupts will fire
 224  * once the writes reach the PRM.  No return value.
 225  */
 226 void omap44xx_prm_restore_irqen(u32 *saved_mask)
 227 {
 228         omap4_prm_write_inst_reg(saved_mask[0], OMAP4430_PRM_DEVICE_INST,
 229                                  OMAP4_PRM_IRQENABLE_MPU_OFFSET);
 230         omap4_prm_write_inst_reg(saved_mask[1], OMAP4430_PRM_DEVICE_INST,
 231                                  OMAP4_PRM_IRQENABLE_MPU_2_OFFSET);
 232 }
 233
 234 static int __init omap4xxx_prcm_init(void)
 235 {
 236         if (cpu_is_omap44xx())
 237                 return omap_prcm_register_chain_handler(&omap4_prcm_irq_setup);
 238         return 0;
 239 }
 240 subsys_initcall(omap4xxx_prcm_init);