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Sylvain Lemieux980db8c2015-08-10 08:16:31 -04001/*
2 * Copyright (C) 2008 by NXP Semiconductors
3 * @Author: Kevin Wells
4 * @Descr: LPC3250 DMA controller interface support functions
5 *
6 * Copyright (c) 2015 Tyco Fire Protection Products.
7 *
8 * SPDX-License-Identifier: GPL-2.0+
9 */
10
11#include <common.h>
12#include <errno.h>
13#include <asm/arch/dma.h>
14#include <asm/arch/cpu.h>
15#include <asm/arch/clk.h>
16#include <asm/arch/sys_proto.h>
17#include <asm/io.h>
18
19/* DMA controller channel register structure */
20struct dmac_chan_reg {
21 u32 src_addr;
22 u32 dest_addr;
23 u32 lli;
24 u32 control;
25 u32 config_ch;
26 u32 reserved[3];
27};
28
29/* DMA controller register structures */
30struct dma_reg {
31 u32 int_stat;
32 u32 int_tc_stat;
33 u32 int_tc_clear;
34 u32 int_err_stat;
35 u32 int_err_clear;
36 u32 raw_tc_stat;
37 u32 raw_err_stat;
38 u32 chan_enable;
39 u32 sw_burst_req;
40 u32 sw_single_req;
41 u32 sw_last_burst_req;
42 u32 sw_last_single_req;
43 u32 config;
44 u32 sync;
45 u32 reserved[50];
46 struct dmac_chan_reg dma_chan[8];
47};
48
49#define DMA_NO_OF_CHANNELS 8
50
51/* config register definitions */
52#define DMAC_CTRL_ENABLE (1 << 0) /* For enabling the DMA controller */
53
54static u32 alloc_ch;
55
56static struct dma_reg *dma = (struct dma_reg *)DMA_BASE;
57
58int lpc32xx_dma_get_channel(void)
59{
60 int i;
61
62 if (!alloc_ch) { /* First time caller */
63 /*
64 * DMA clock are enable by "lpc32xx_dma_init()" and should
65 * be call by board "board_early_init_f()" function.
66 */
67
68 /*
69 * Make sure DMA controller and all channels are disabled.
70 * Controller is in little-endian mode. Disable sync signals.
71 */
72 writel(0, &dma->config);
73 writel(0, &dma->sync);
74
75 /* Clear interrupt and error statuses */
76 writel(0xFF, &dma->int_tc_clear);
77 writel(0xFF, &dma->raw_tc_stat);
78 writel(0xFF, &dma->int_err_clear);
79 writel(0xFF, &dma->raw_err_stat);
80
81 /* Enable DMA controller */
82 writel(DMAC_CTRL_ENABLE, &dma->config);
83 }
84
85 i = ffz(alloc_ch);
86
87 /* Check if all the available channels are busy */
88 if (unlikely(i == DMA_NO_OF_CHANNELS))
89 return -1;
90 alloc_ch |= BIT_MASK(i);
91 return i;
92}
93
94int lpc32xx_dma_start_xfer(unsigned int channel,
95 const struct lpc32xx_dmac_ll *desc, u32 config)
96{
97 if (unlikely(((BIT_MASK(channel) & alloc_ch) == 0) ||
98 (channel >= DMA_NO_OF_CHANNELS))) {
Masahiro Yamada9b643e32017-09-16 14:10:41 +090099 pr_err("Request for xfer on unallocated channel %d", channel);
Sylvain Lemieux980db8c2015-08-10 08:16:31 -0400100 return -1;
101 }
102 writel(BIT_MASK(channel), &dma->int_tc_clear);
103 writel(BIT_MASK(channel), &dma->int_err_clear);
104 writel(desc->dma_src, &dma->dma_chan[channel].src_addr);
105 writel(desc->dma_dest, &dma->dma_chan[channel].dest_addr);
106 writel(desc->next_lli, &dma->dma_chan[channel].lli);
107 writel(desc->next_ctrl, &dma->dma_chan[channel].control);
108 writel(config, &dma->dma_chan[channel].config_ch);
109
110 return 0;
111}
112
113int lpc32xx_dma_wait_status(unsigned int channel)
114{
115 unsigned long start;
116 u32 reg;
117
118 /* Check if given channel is valid */
119 if (unlikely(channel >= DMA_NO_OF_CHANNELS)) {
Masahiro Yamada9b643e32017-09-16 14:10:41 +0900120 pr_err("Request for status on unallocated channel %d", channel);
Sylvain Lemieux980db8c2015-08-10 08:16:31 -0400121 return -1;
122 }
123
124 start = get_timer(0);
125 while (1) {
126 reg = readl(&dma->raw_tc_stat);
127 reg |= readl(dma->raw_err_stat);
128 if (reg & BIT_MASK(channel))
129 break;
130
131 if (get_timer(start) > CONFIG_SYS_HZ) {
Masahiro Yamada9b643e32017-09-16 14:10:41 +0900132 pr_err("DMA status timeout channel %d\n", channel);
Sylvain Lemieux980db8c2015-08-10 08:16:31 -0400133 return -ETIMEDOUT;
134 }
135 udelay(1);
136 }
137
138 if (unlikely(readl(&dma->raw_err_stat) & BIT_MASK(channel))) {
139 setbits_le32(&dma->int_err_clear, BIT_MASK(channel));
140 setbits_le32(&dma->raw_err_stat, BIT_MASK(channel));
Masahiro Yamada9b643e32017-09-16 14:10:41 +0900141 pr_err("DMA error on channel %d\n", channel);
Sylvain Lemieux980db8c2015-08-10 08:16:31 -0400142 return -1;
143 }
144 setbits_le32(&dma->int_tc_clear, BIT_MASK(channel));
145 setbits_le32(&dma->raw_tc_stat, BIT_MASK(channel));
146 return 0;
147}