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1 /*
2  * Copyright (c) 2015-2020, Renesas Electronics Corporation. All rights reserved.
3  *
4  * SPDX-License-Identifier: BSD-3-Clause
5  */
6 
7 #include <stdint.h>
8 #include <string.h>
9 
10 #include <arch_helpers.h>
11 #include <common/debug.h>
12 #include <lib/mmio.h>
13 
14 #include "cpg_registers.h"
15 #include "rcar_def.h"
16 #include "rcar_private.h"
17 
18 /* DMA CHANNEL setting (0/16/32) */
19 #if RCAR_LSI == RCAR_V3M
20 #define DMA_CH		16
21 #else
22 #define DMA_CH		0
23 #endif
24 
25 #if (DMA_CH == 0)
26 #define SYS_DMAC_BIT	((uint32_t)1U << 19U)
27 #define DMA_BASE	(0xE6700000U)
28 #elif (DMA_CH == 16)
29 #define SYS_DMAC_BIT	((uint32_t)1U << 18U)
30 #define DMA_BASE	(0xE7300000U)
31 #elif (DMA_CH == 32)
32 #define SYS_DMAC_BIT	((uint32_t)1U << 17U)
33 #define DMA_BASE	(0xE7320000U)
34 #else
35 #define SYS_DMAC_BIT	((uint32_t)1U << 19U)
36 #define DMA_BASE	(0xE6700000U)
37 #endif
38 
39 /* DMA operation */
40 #define DMA_DMAOR	(DMA_BASE + 0x0060U)
41 /* DMA secure control */
42 #define DMA_DMASEC	(DMA_BASE + 0x0030U)
43 /* DMA channel clear */
44 #define DMA_DMACHCLR	(DMA_BASE + 0x0080U)
45 /* DMA source address */
46 #define DMA_DMASAR	(DMA_BASE + 0x8000U)
47 /* DMA destination address */
48 #define DMA_DMADAR	(DMA_BASE + 0x8004U)
49 /* DMA transfer count */
50 #define DMA_DMATCR	(DMA_BASE + 0x8008U)
51 /* DMA channel control */
52 #define DMA_DMACHCR	(DMA_BASE + 0x800CU)
53 /* DMA fixed destination address */
54 #define DMA_DMAFIXDAR	(DMA_BASE + 0x8014U)
55 
56 #define DMA_USE_CHANNEL		(0x00000001U)
57 #define DMAOR_INITIAL		(0x0301U)
58 #define DMACHCLR_CH_ALL		(0x0000FFFFU)
59 #define DMAFIXDAR_32BIT_SHIFT	(32U)
60 #define DMAFIXDAR_DAR_MASK	(0x000000FFU)
61 #define DMADAR_BOUNDARY_ADDR	(0x100000000ULL)
62 #define DMATCR_CNT_SHIFT	(6U)
63 #define DMATCR_MAX		(0x00FFFFFFU)
64 #define DMACHCR_TRN_MODE	(0x00105409U)
65 #define DMACHCR_DE_BIT		(0x00000001U)
66 #define DMACHCR_TE_BIT		(0x00000002U)
67 #define DMACHCR_CHE_BIT		(0x80000000U)
68 
69 #define DMA_SIZE_UNIT		FLASH_TRANS_SIZE_UNIT
70 #define DMA_FRACTION_MASK	(0xFFU)
71 #define DMA_DST_LIMIT		(0x10000000000ULL)
72 
73 /* transfer length limit */
74 #define DMA_LENGTH_LIMIT	((DMATCR_MAX * (1U << DMATCR_CNT_SHIFT)) \
75 				& ~DMA_FRACTION_MASK)
76 
dma_enable(void)77 static void dma_enable(void)
78 {
79 	mstpcr_write(CPG_SMSTPCR2, CPG_MSTPSR2, SYS_DMAC_BIT);
80 }
81 
dma_setup(void)82 static void dma_setup(void)
83 {
84 	mmio_write_16(DMA_DMAOR, 0);
85 	mmio_write_32(DMA_DMACHCLR, DMACHCLR_CH_ALL);
86 }
87 
dma_start(uintptr_t dst,uint32_t src,uint32_t len)88 static void dma_start(uintptr_t dst, uint32_t src, uint32_t len)
89 {
90 	mmio_write_16(DMA_DMAOR, DMAOR_INITIAL);
91 	mmio_write_32(DMA_DMAFIXDAR, (dst >> DMAFIXDAR_32BIT_SHIFT) &
92 		      DMAFIXDAR_DAR_MASK);
93 	mmio_write_32(DMA_DMADAR, dst & UINT32_MAX);
94 	mmio_write_32(DMA_DMASAR, src);
95 	mmio_write_32(DMA_DMATCR, len >> DMATCR_CNT_SHIFT);
96 	mmio_write_32(DMA_DMASEC, DMA_USE_CHANNEL);
97 	mmio_write_32(DMA_DMACHCR, DMACHCR_TRN_MODE);
98 }
99 
dma_end(void)100 static void dma_end(void)
101 {
102 	while ((mmio_read_32(DMA_DMACHCR) & DMACHCR_TE_BIT) == 0) {
103 		if ((mmio_read_32(DMA_DMACHCR) & DMACHCR_CHE_BIT) != 0U) {
104 			ERROR("BL2: DMA - Channel Address Error\n");
105 			panic();
106 			break;
107 		}
108 	}
109 	/* DMA transfer Disable */
110 	mmio_clrbits_32(DMA_DMACHCR, DMACHCR_DE_BIT);
111 	while ((mmio_read_32(DMA_DMACHCR) & DMACHCR_DE_BIT) != 0)
112 		;
113 
114 	mmio_write_32(DMA_DMASEC, 0);
115 	mmio_write_16(DMA_DMAOR, 0);
116 	mmio_write_32(DMA_DMACHCLR, DMA_USE_CHANNEL);
117 }
118 
rcar_dma_exec(uintptr_t dst,uint32_t src,uint32_t len)119 void rcar_dma_exec(uintptr_t dst, uint32_t src, uint32_t len)
120 {
121 	uint32_t dma_len = len;
122 
123 	if (len & DMA_FRACTION_MASK)
124 		dma_len = (len + DMA_SIZE_UNIT) & ~DMA_FRACTION_MASK;
125 
126 	if (!dma_len || dma_len > DMA_LENGTH_LIMIT) {
127 		ERROR("BL2: DMA - size invalid, length (0x%x)\n", dma_len);
128 		panic();
129 	}
130 
131 	if (src & DMA_FRACTION_MASK) {
132 		ERROR("BL2: DMA - src address invalid (0x%x), len=(0x%x)\n",
133 		      src, dma_len);
134 		panic();
135 	}
136 
137 	if ((dst & UINT32_MAX) + dma_len > DMADAR_BOUNDARY_ADDR	||
138 	    (dst + dma_len > DMA_DST_LIMIT) ||
139 	    (dst & DMA_FRACTION_MASK)) {
140 		ERROR("BL2: DMA - dest address invalid (0x%lx), len=(0x%x)\n",
141 		      dst, dma_len);
142 		panic();
143 	}
144 
145 	dma_start(dst, src, dma_len);
146 	dma_end();
147 }
148 
rcar_dma_init(void)149 void rcar_dma_init(void)
150 {
151 	dma_enable();
152 	dma_setup();
153 }
154