1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 *
4 * Copyright (c) 2011, The Linux Foundation. All rights reserved.
5 */
6 #include <linux/of.h>
7 #include <linux/of_dma.h>
8 #include <linux/bitops.h>
9 #include <linux/mmc/host.h>
10 #include <linux/mmc/card.h>
11 #include "mmci.h"
12
13 /* Registers */
14 #define DML_CONFIG 0x00
15 #define PRODUCER_CRCI_MSK GENMASK(1, 0)
16 #define PRODUCER_CRCI_DISABLE 0
17 #define PRODUCER_CRCI_X_SEL BIT(0)
18 #define PRODUCER_CRCI_Y_SEL BIT(1)
19 #define CONSUMER_CRCI_MSK GENMASK(3, 2)
20 #define CONSUMER_CRCI_DISABLE 0
21 #define CONSUMER_CRCI_X_SEL BIT(2)
22 #define CONSUMER_CRCI_Y_SEL BIT(3)
23 #define PRODUCER_TRANS_END_EN BIT(4)
24 #define BYPASS BIT(16)
25 #define DIRECT_MODE BIT(17)
26 #define INFINITE_CONS_TRANS BIT(18)
27
28 #define DML_SW_RESET 0x08
29 #define DML_PRODUCER_START 0x0c
30 #define DML_CONSUMER_START 0x10
31 #define DML_PRODUCER_PIPE_LOGICAL_SIZE 0x14
32 #define DML_CONSUMER_PIPE_LOGICAL_SIZE 0x18
33 #define DML_PIPE_ID 0x1c
34 #define PRODUCER_PIPE_ID_SHFT 0
35 #define PRODUCER_PIPE_ID_MSK GENMASK(4, 0)
36 #define CONSUMER_PIPE_ID_SHFT 16
37 #define CONSUMER_PIPE_ID_MSK GENMASK(20, 16)
38
39 #define DML_PRODUCER_BAM_BLOCK_SIZE 0x24
40 #define DML_PRODUCER_BAM_TRANS_SIZE 0x28
41
42 /* other definitions */
43 #define PRODUCER_PIPE_LOGICAL_SIZE 4096
44 #define CONSUMER_PIPE_LOGICAL_SIZE 4096
45
46 #define DML_OFFSET 0x800
47
qcom_dma_start(struct mmci_host * host,unsigned int * datactrl)48 static int qcom_dma_start(struct mmci_host *host, unsigned int *datactrl)
49 {
50 u32 config;
51 void __iomem *base = host->base + DML_OFFSET;
52 struct mmc_data *data = host->data;
53 int ret = mmci_dmae_start(host, datactrl);
54
55 if (ret)
56 return ret;
57
58 if (data->flags & MMC_DATA_READ) {
59 /* Read operation: configure DML for producer operation */
60 /* Set producer CRCI-x and disable consumer CRCI */
61 config = readl_relaxed(base + DML_CONFIG);
62 config = (config & ~PRODUCER_CRCI_MSK) | PRODUCER_CRCI_X_SEL;
63 config = (config & ~CONSUMER_CRCI_MSK) | CONSUMER_CRCI_DISABLE;
64 writel_relaxed(config, base + DML_CONFIG);
65
66 /* Set the Producer BAM block size */
67 writel_relaxed(data->blksz, base + DML_PRODUCER_BAM_BLOCK_SIZE);
68
69 /* Set Producer BAM Transaction size */
70 writel_relaxed(data->blocks * data->blksz,
71 base + DML_PRODUCER_BAM_TRANS_SIZE);
72 /* Set Producer Transaction End bit */
73 config = readl_relaxed(base + DML_CONFIG);
74 config |= PRODUCER_TRANS_END_EN;
75 writel_relaxed(config, base + DML_CONFIG);
76 /* Trigger producer */
77 writel_relaxed(1, base + DML_PRODUCER_START);
78 } else {
79 /* Write operation: configure DML for consumer operation */
80 /* Set consumer CRCI-x and disable producer CRCI*/
81 config = readl_relaxed(base + DML_CONFIG);
82 config = (config & ~CONSUMER_CRCI_MSK) | CONSUMER_CRCI_X_SEL;
83 config = (config & ~PRODUCER_CRCI_MSK) | PRODUCER_CRCI_DISABLE;
84 writel_relaxed(config, base + DML_CONFIG);
85 /* Clear Producer Transaction End bit */
86 config = readl_relaxed(base + DML_CONFIG);
87 config &= ~PRODUCER_TRANS_END_EN;
88 writel_relaxed(config, base + DML_CONFIG);
89 /* Trigger consumer */
90 writel_relaxed(1, base + DML_CONSUMER_START);
91 }
92
93 /* make sure the dml is configured before dma is triggered */
94 wmb();
95 return 0;
96 }
97
of_get_dml_pipe_index(struct device_node * np,const char * name)98 static int of_get_dml_pipe_index(struct device_node *np, const char *name)
99 {
100 int index;
101 struct of_phandle_args dma_spec;
102
103 index = of_property_match_string(np, "dma-names", name);
104
105 if (index < 0)
106 return -ENODEV;
107
108 if (of_parse_phandle_with_args(np, "dmas", "#dma-cells", index,
109 &dma_spec))
110 return -ENODEV;
111
112 if (dma_spec.args_count)
113 return dma_spec.args[0];
114
115 return -ENODEV;
116 }
117
118 /* Initialize the dml hardware connected to SD Card controller */
qcom_dma_setup(struct mmci_host * host)119 static int qcom_dma_setup(struct mmci_host *host)
120 {
121 u32 config;
122 void __iomem *base;
123 int consumer_id, producer_id;
124 struct device_node *np = host->mmc->parent->of_node;
125
126 if (mmci_dmae_setup(host))
127 return -EINVAL;
128
129 consumer_id = of_get_dml_pipe_index(np, "tx");
130 producer_id = of_get_dml_pipe_index(np, "rx");
131
132 if (producer_id < 0 || consumer_id < 0) {
133 mmci_dmae_release(host);
134 return -EINVAL;
135 }
136
137 base = host->base + DML_OFFSET;
138
139 /* Reset the DML block */
140 writel_relaxed(1, base + DML_SW_RESET);
141
142 /* Disable the producer and consumer CRCI */
143 config = (PRODUCER_CRCI_DISABLE | CONSUMER_CRCI_DISABLE);
144 /*
145 * Disable the bypass mode. Bypass mode will only be used
146 * if data transfer is to happen in PIO mode and don't
147 * want the BAM interface to connect with SDCC-DML.
148 */
149 config &= ~BYPASS;
150 /*
151 * Disable direct mode as we don't DML to MASTER the AHB bus.
152 * BAM connected with DML should MASTER the AHB bus.
153 */
154 config &= ~DIRECT_MODE;
155 /*
156 * Disable infinite mode transfer as we won't be doing any
157 * infinite size data transfers. All data transfer will be
158 * of finite data size.
159 */
160 config &= ~INFINITE_CONS_TRANS;
161 writel_relaxed(config, base + DML_CONFIG);
162
163 /*
164 * Initialize the logical BAM pipe size for producer
165 * and consumer.
166 */
167 writel_relaxed(PRODUCER_PIPE_LOGICAL_SIZE,
168 base + DML_PRODUCER_PIPE_LOGICAL_SIZE);
169 writel_relaxed(CONSUMER_PIPE_LOGICAL_SIZE,
170 base + DML_CONSUMER_PIPE_LOGICAL_SIZE);
171
172 /* Initialize Producer/consumer pipe id */
173 writel_relaxed(producer_id | (consumer_id << CONSUMER_PIPE_ID_SHFT),
174 base + DML_PIPE_ID);
175
176 /* Make sure dml initialization is finished */
177 mb();
178
179 return 0;
180 }
181
qcom_get_dctrl_cfg(struct mmci_host * host)182 static u32 qcom_get_dctrl_cfg(struct mmci_host *host)
183 {
184 return MCI_DPSM_ENABLE | (host->data->blksz << 4);
185 }
186
187 static struct mmci_host_ops qcom_variant_ops = {
188 .prep_data = mmci_dmae_prep_data,
189 .unprep_data = mmci_dmae_unprep_data,
190 .get_datactrl_cfg = qcom_get_dctrl_cfg,
191 .get_next_data = mmci_dmae_get_next_data,
192 .dma_setup = qcom_dma_setup,
193 .dma_release = mmci_dmae_release,
194 .dma_start = qcom_dma_start,
195 .dma_finalize = mmci_dmae_finalize,
196 .dma_error = mmci_dmae_error,
197 };
198
qcom_variant_init(struct mmci_host * host)199 void qcom_variant_init(struct mmci_host *host)
200 {
201 host->ops = &qcom_variant_ops;
202 }
203