1 | /** |
---|
2 | * @file |
---|
3 | * |
---|
4 | * @ingroup lpc32xx_emc |
---|
5 | * |
---|
6 | * @brief EMC support implementation. |
---|
7 | */ |
---|
8 | |
---|
9 | /* |
---|
10 | * Copyright (c) 2010 |
---|
11 | * embedded brains GmbH |
---|
12 | * Obere Lagerstr. 30 |
---|
13 | * D-82178 Puchheim |
---|
14 | * Germany |
---|
15 | * <rtems@embedded-brains.de> |
---|
16 | * |
---|
17 | * The license and distribution terms for this file may be |
---|
18 | * found in the file LICENSE in this distribution or at |
---|
19 | * http://www.rtems.org/license/LICENSE. |
---|
20 | */ |
---|
21 | |
---|
22 | #include <bsp/emc.h> |
---|
23 | |
---|
24 | #include <bsp.h> |
---|
25 | #include <bsp/mmu.h> |
---|
26 | |
---|
27 | static volatile lpc_emc *const emc = &lpc32xx.emc; |
---|
28 | |
---|
29 | static volatile lpc32xx_emc_ahb *const emc_ahb = &lpc32xx.emc_ahb [0]; |
---|
30 | |
---|
31 | static void dynamic_init(const lpc32xx_emc_dynamic_config *cfg) |
---|
32 | { |
---|
33 | uint32_t chip_begin = LPC32XX_BASE_EMC_DYCS_0; |
---|
34 | uint32_t dynamiccontrol = (cfg->control | EMC_DYN_CTRL_CE | EMC_DYN_CTRL_CS) |
---|
35 | & ~EMC_DYN_CTRL_I_MASK; |
---|
36 | size_t i = 0; |
---|
37 | |
---|
38 | LPC32XX_SDRAMCLK_CTRL = cfg->sdramclk_ctrl; |
---|
39 | |
---|
40 | emc->dynamicreadconfig = cfg->readconfig; |
---|
41 | |
---|
42 | /* Timings */ |
---|
43 | emc->dynamictrp = cfg->trp; |
---|
44 | emc->dynamictras = cfg->tras; |
---|
45 | emc->dynamictsrex = cfg->tsrex; |
---|
46 | emc->dynamictwr = cfg->twr; |
---|
47 | emc->dynamictrc = cfg->trc; |
---|
48 | emc->dynamictrfc = cfg->trfc; |
---|
49 | emc->dynamictxsr = cfg->txsr; |
---|
50 | emc->dynamictrrd = cfg->trrd; |
---|
51 | emc->dynamictmrd = cfg->tmrd; |
---|
52 | emc->dynamictcdlr = cfg->tcdlr; |
---|
53 | for (i = 0; i < EMC_DYN_CHIP_COUNT; ++i) { |
---|
54 | if (cfg->chip [i].size != 0) { |
---|
55 | emc->dynamic [i].config = cfg->chip [i].config; |
---|
56 | emc->dynamic [i].rascas = cfg->chip [i].rascas; |
---|
57 | } |
---|
58 | } |
---|
59 | |
---|
60 | /* NOP period */ |
---|
61 | emc->dynamiccontrol = dynamiccontrol | EMC_DYN_CTRL_I_NOP; |
---|
62 | lpc32xx_micro_seconds_delay(cfg->nop_time_in_us); |
---|
63 | |
---|
64 | /* Precharge */ |
---|
65 | emc->dynamiccontrol = dynamiccontrol | EMC_DYN_CTRL_I_PALL; |
---|
66 | emc->dynamicrefresh = 1; |
---|
67 | /* FIXME: Why a delay, why this value? */ |
---|
68 | lpc32xx_micro_seconds_delay(10); |
---|
69 | |
---|
70 | /* Refresh timing */ |
---|
71 | emc->dynamicrefresh = cfg->refresh; |
---|
72 | /* FIXME: Why a delay, why this value? */ |
---|
73 | lpc32xx_micro_seconds_delay(16); |
---|
74 | |
---|
75 | /* Set modes */ |
---|
76 | for (i = 0; i < EMC_DYN_CHIP_COUNT; ++i) { |
---|
77 | if (cfg->chip [i].size != 0) { |
---|
78 | lpc32xx_set_translation_table_entries( |
---|
79 | (void *) chip_begin, |
---|
80 | (void *) (chip_begin + cfg->chip [i].size), |
---|
81 | LPC32XX_MMU_READ_WRITE |
---|
82 | ); |
---|
83 | emc->dynamiccontrol = dynamiccontrol | EMC_DYN_CTRL_I_MODE; |
---|
84 | *(volatile uint32_t *)(chip_begin + cfg->chip [i].mode); |
---|
85 | emc->dynamiccontrol = dynamiccontrol | EMC_DYN_CTRL_I_MODE; |
---|
86 | *(volatile uint32_t *)(chip_begin + cfg->chip [i].extmode); |
---|
87 | } |
---|
88 | chip_begin += 0x20000000; |
---|
89 | } |
---|
90 | |
---|
91 | emc->dynamiccontrol = cfg->control; |
---|
92 | } |
---|
93 | |
---|
94 | void lpc32xx_emc_init(const lpc32xx_emc_dynamic_config *dyn_cfg) |
---|
95 | { |
---|
96 | /* Enable buffers in AHB ports */ |
---|
97 | emc_ahb [0].control = EMC_AHB_PORT_BUFF_EN; |
---|
98 | emc_ahb [3].control = EMC_AHB_PORT_BUFF_EN; |
---|
99 | emc_ahb [4].control = EMC_AHB_PORT_BUFF_EN; |
---|
100 | |
---|
101 | /* Set AHB port timeouts */ |
---|
102 | emc_ahb [0].timeout = EMC_AHB_TIMEOUT(32); |
---|
103 | emc_ahb [3].timeout = EMC_AHB_TIMEOUT(32); |
---|
104 | emc_ahb [4].timeout = EMC_AHB_TIMEOUT(32); |
---|
105 | |
---|
106 | /* Enable EMC */ |
---|
107 | emc->control = EMC_CTRL_E, |
---|
108 | emc->config = 0; |
---|
109 | |
---|
110 | dynamic_init(dyn_cfg); |
---|
111 | } |
---|