| Paul Walmsley | 2ace831 | 2010-12-21 21:05:14 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * OMAP4 CM instance functions |
| 3 | * |
| 4 | * Copyright (C) 2009 Nokia Corporation |
| 5 | * Paul Walmsley |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License version 2 as |
| 9 | * published by the Free Software Foundation. |
| 10 | * |
| 11 | * This is needed since CM instances can be in the PRM, PRCM_MPU, CM1, |
| 12 | * or CM2 hardware modules. For example, the EMU_CM CM instance is in |
| 13 | * the PRM hardware module. What a mess... |
| 14 | */ |
| 15 | |
| 16 | #include <linux/kernel.h> |
| 17 | #include <linux/types.h> |
| 18 | #include <linux/errno.h> |
| 19 | #include <linux/err.h> |
| 20 | #include <linux/io.h> |
| 21 | |
| 22 | #include <plat/common.h> |
| 23 | |
| 24 | #include "cm.h" |
| 25 | #include "cm1_44xx.h" |
| 26 | #include "cm2_44xx.h" |
| 27 | #include "cm44xx.h" |
| 28 | #include "cminst44xx.h" |
| 29 | #include "cm-regbits-44xx.h" |
| 30 | #include "prcm44xx.h" |
| 31 | #include "prm44xx.h" |
| 32 | #include "prcm_mpu44xx.h" |
| 33 | |
| 34 | static u32 _cm_bases[OMAP4_MAX_PRCM_PARTITIONS] = { |
| 35 | [OMAP4430_INVALID_PRCM_PARTITION] = 0, |
| 36 | [OMAP4430_PRM_PARTITION] = OMAP4430_PRM_BASE, |
| 37 | [OMAP4430_CM1_PARTITION] = OMAP4430_CM1_BASE, |
| 38 | [OMAP4430_CM2_PARTITION] = OMAP4430_CM2_BASE, |
| 39 | [OMAP4430_SCRM_PARTITION] = 0, |
| 40 | [OMAP4430_PRCM_MPU_PARTITION] = OMAP4430_PRCM_MPU_BASE, |
| 41 | }; |
| 42 | |
| 43 | /* Read a register in a CM instance */ |
| 44 | u32 omap4_cminst_read_inst_reg(u8 part, s16 inst, u16 idx) |
| 45 | { |
| 46 | BUG_ON(part >= OMAP4_MAX_PRCM_PARTITIONS || |
| 47 | part == OMAP4430_INVALID_PRCM_PARTITION || |
| 48 | !_cm_bases[part]); |
| 49 | return __raw_readl(OMAP2_L4_IO_ADDRESS(_cm_bases[part] + inst + idx)); |
| 50 | } |
| 51 | |
| 52 | /* Write into a register in a CM instance */ |
| 53 | void omap4_cminst_write_inst_reg(u32 val, u8 part, s16 inst, u16 idx) |
| 54 | { |
| 55 | BUG_ON(part >= OMAP4_MAX_PRCM_PARTITIONS || |
| 56 | part == OMAP4430_INVALID_PRCM_PARTITION || |
| 57 | !_cm_bases[part]); |
| 58 | __raw_writel(val, OMAP2_L4_IO_ADDRESS(_cm_bases[part] + inst + idx)); |
| 59 | } |
| 60 | |
| 61 | /* Read-modify-write a register in CM1. Caller must lock */ |
| 62 | u32 omap4_cminst_rmw_inst_reg_bits(u32 mask, u32 bits, u8 part, s16 inst, |
| 63 | s16 idx) |
| 64 | { |
| 65 | u32 v; |
| 66 | |
| 67 | v = omap4_cminst_read_inst_reg(part, inst, idx); |
| 68 | v &= ~mask; |
| 69 | v |= bits; |
| 70 | omap4_cminst_write_inst_reg(v, part, inst, idx); |
| 71 | |
| 72 | return v; |
| 73 | } |
| 74 | |
| 75 | |
| 76 | /** |
| 77 | * omap4_cm_wait_module_ready - wait for a module to be in 'func' state |
| 78 | * @clkctrl_reg: CLKCTRL module address |
| 79 | * |
| 80 | * Wait for the module IDLEST to be functional. If the idle state is in any |
| 81 | * the non functional state (trans, idle or disabled), module and thus the |
| 82 | * sysconfig cannot be accessed and will probably lead to an "imprecise |
| 83 | * external abort" |
| 84 | * |
| 85 | * Module idle state: |
| 86 | * 0x0 func: Module is fully functional, including OCP |
| 87 | * 0x1 trans: Module is performing transition: wakeup, or sleep, or sleep |
| 88 | * abortion |
| 89 | * 0x2 idle: Module is in Idle mode (only OCP part). It is functional if |
| 90 | * using separate functional clock |
| 91 | * 0x3 disabled: Module is disabled and cannot be accessed |
| 92 | * |
| 93 | */ |
| 94 | int omap4_cm_wait_module_ready(void __iomem *clkctrl_reg) |
| 95 | { |
| 96 | int i = 0; |
| 97 | |
| 98 | if (!clkctrl_reg) |
| 99 | return 0; |
| 100 | |
| 101 | omap_test_timeout(( |
| 102 | ((__raw_readl(clkctrl_reg) & OMAP4430_IDLEST_MASK) == 0) || |
| 103 | (((__raw_readl(clkctrl_reg) & OMAP4430_IDLEST_MASK) >> |
| 104 | OMAP4430_IDLEST_SHIFT) == 0x2)), |
| 105 | MAX_MODULE_READY_TIME, i); |
| 106 | |
| 107 | return (i < MAX_MODULE_READY_TIME) ? 0 : -EBUSY; |
| 108 | } |
| 109 | |