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1// SPDX-License-Identifier: GPL-2.0
2//
3// Copyright (C) 2019 Texas Instruments Incorporated - https://www.ti.com/
4// Author: Vignesh Raghavendra <vigneshr@ti.com>
5
6#include <linux/completion.h>
7#include <linux/dma-direction.h>
8#include <linux/dma-mapping.h>
9#include <linux/dmaengine.h>
10#include <linux/err.h>
11#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/mtd/cfi.h>
14#include <linux/mtd/hyperbus.h>
15#include <linux/mtd/mtd.h>
16#include <linux/mux/consumer.h>
17#include <linux/of.h>
18#include <linux/of_address.h>
19#include <linux/platform_device.h>
20#include <linux/sched/task_stack.h>
21#include <linux/types.h>
22
23#define AM654_HBMC_CALIB_COUNT 25
24
25struct am654_hbmc_device_priv {
26 struct completion rx_dma_complete;
27 phys_addr_t device_base;
28 struct hyperbus_ctlr *ctlr;
29 struct dma_chan *rx_chan;
30};
31
32struct am654_hbmc_priv {
33 struct hyperbus_ctlr ctlr;
34 struct hyperbus_device hbdev;
35 struct mux_control *mux_ctrl;
36};
37
38static int am654_hbmc_calibrate(struct hyperbus_device *hbdev)
39{
40 struct map_info *map = &hbdev->map;
41 struct cfi_private cfi;
42 int count = AM654_HBMC_CALIB_COUNT;
43 int pass_count = 0;
44 int ret;
45
46 cfi.interleave = 1;
47 cfi.device_type = CFI_DEVICETYPE_X16;
48 cfi_send_gen_cmd(0xF0, 0, 0, map, &cfi, cfi.device_type, NULL);
49 cfi_send_gen_cmd(0x98, 0x55, 0, map, &cfi, cfi.device_type, NULL);
50
51 while (count--) {
52 ret = cfi_qry_present(map, 0, &cfi);
53 if (ret)
54 pass_count++;
55 else
56 pass_count = 0;
57 if (pass_count == 5)
58 break;
59 }
60
61 cfi_qry_mode_off(0, map, &cfi);
62
63 return ret;
64}
65
66static void am654_hbmc_dma_callback(void *param)
67{
68 struct am654_hbmc_device_priv *priv = param;
69
70 complete(&priv->rx_dma_complete);
71}
72
73static int am654_hbmc_dma_read(struct am654_hbmc_device_priv *priv, void *to,
74 unsigned long from, ssize_t len)
75
76{
77 enum dma_ctrl_flags flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT;
78 struct dma_chan *rx_chan = priv->rx_chan;
79 struct dma_async_tx_descriptor *tx;
80 dma_addr_t dma_dst, dma_src;
81 dma_cookie_t cookie;
82 int ret;
83
84 if (!priv->rx_chan || !virt_addr_valid(to) || object_is_on_stack(to))
85 return -EINVAL;
86
87 dma_dst = dma_map_single(rx_chan->device->dev, to, len, DMA_FROM_DEVICE);
88 if (dma_mapping_error(rx_chan->device->dev, dma_dst)) {
89 dev_dbg(priv->ctlr->dev, "DMA mapping failed\n");
90 return -EIO;
91 }
92
93 dma_src = priv->device_base + from;
94 tx = dmaengine_prep_dma_memcpy(rx_chan, dma_dst, dma_src, len, flags);
95 if (!tx) {
96 dev_err(priv->ctlr->dev, "device_prep_dma_memcpy error\n");
97 ret = -EIO;
98 goto unmap_dma;
99 }
100
101 reinit_completion(&priv->rx_dma_complete);
102 tx->callback = am654_hbmc_dma_callback;
103 tx->callback_param = priv;
104 cookie = dmaengine_submit(tx);
105
106 ret = dma_submit_error(cookie);
107 if (ret) {
108 dev_err(priv->ctlr->dev, "dma_submit_error %d\n", cookie);
109 goto unmap_dma;
110 }
111
112 dma_async_issue_pending(rx_chan);
113 if (!wait_for_completion_timeout(&priv->rx_dma_complete, msecs_to_jiffies(len + 1000))) {
114 dmaengine_terminate_sync(rx_chan);
115 dev_err(priv->ctlr->dev, "DMA wait_for_completion_timeout\n");
116 ret = -ETIMEDOUT;
117 }
118
119unmap_dma:
120 dma_unmap_single(rx_chan->device->dev, dma_dst, len, DMA_FROM_DEVICE);
121 return ret;
122}
123
124static void am654_hbmc_read(struct hyperbus_device *hbdev, void *to,
125 unsigned long from, ssize_t len)
126{
127 struct am654_hbmc_device_priv *priv = hbdev->priv;
128
129 if (len < SZ_1K || am654_hbmc_dma_read(priv, to, from, len))
130 memcpy_fromio(to, hbdev->map.virt + from, len);
131}
132
133static const struct hyperbus_ops am654_hbmc_ops = {
134 .calibrate = am654_hbmc_calibrate,
135 .copy_from = am654_hbmc_read,
136};
137
138static int am654_hbmc_request_mmap_dma(struct am654_hbmc_device_priv *priv)
139{
140 struct dma_chan *rx_chan;
141 dma_cap_mask_t mask;
142
143 dma_cap_zero(mask);
144 dma_cap_set(DMA_MEMCPY, mask);
145
146 rx_chan = dma_request_chan_by_mask(&mask);
147 if (IS_ERR(rx_chan)) {
148 if (PTR_ERR(rx_chan) == -EPROBE_DEFER)
149 return -EPROBE_DEFER;
150 dev_dbg(priv->ctlr->dev, "No DMA channel available\n");
151 return 0;
152 }
153 priv->rx_chan = rx_chan;
154 init_completion(&priv->rx_dma_complete);
155
156 return 0;
157}
158
159static int am654_hbmc_probe(struct platform_device *pdev)
160{
161 struct device_node *np = pdev->dev.of_node;
162 struct am654_hbmc_device_priv *dev_priv;
163 struct device *dev = &pdev->dev;
164 struct am654_hbmc_priv *priv;
165 struct resource res;
166 int ret;
167
168 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
169 if (!priv)
170 return -ENOMEM;
171
172 platform_set_drvdata(pdev, priv);
173
174 priv->hbdev.np = of_get_next_child(np, NULL);
175 ret = of_address_to_resource(priv->hbdev.np, 0, &res);
176 if (ret)
177 return ret;
178
179 if (of_property_read_bool(dev->of_node, "mux-controls")) {
180 struct mux_control *control = devm_mux_control_get(dev, NULL);
181
182 if (IS_ERR(control))
183 return PTR_ERR(control);
184
185 ret = mux_control_select(control, 1);
186 if (ret) {
187 dev_err(dev, "Failed to select HBMC mux\n");
188 return ret;
189 }
190 priv->mux_ctrl = control;
191 }
192
193 priv->hbdev.map.size = resource_size(&res);
194 priv->hbdev.map.virt = devm_ioremap_resource(dev, &res);
195 if (IS_ERR(priv->hbdev.map.virt))
196 return PTR_ERR(priv->hbdev.map.virt);
197
198 priv->ctlr.dev = dev;
199 priv->ctlr.ops = &am654_hbmc_ops;
200 priv->hbdev.ctlr = &priv->ctlr;
201
202 dev_priv = devm_kzalloc(dev, sizeof(*dev_priv), GFP_KERNEL);
203 if (!dev_priv) {
204 ret = -ENOMEM;
205 goto disable_mux;
206 }
207
208 priv->hbdev.priv = dev_priv;
209 dev_priv->device_base = res.start;
210 dev_priv->ctlr = &priv->ctlr;
211
212 ret = am654_hbmc_request_mmap_dma(dev_priv);
213 if (ret)
214 goto disable_mux;
215
216 ret = hyperbus_register_device(&priv->hbdev);
217 if (ret) {
218 dev_err(dev, "failed to register controller\n");
219 goto release_dma;
220 }
221
222 return 0;
223release_dma:
224 if (dev_priv->rx_chan)
225 dma_release_channel(dev_priv->rx_chan);
226disable_mux:
227 if (priv->mux_ctrl)
228 mux_control_deselect(priv->mux_ctrl);
229 return ret;
230}
231
232static void am654_hbmc_remove(struct platform_device *pdev)
233{
234 struct am654_hbmc_priv *priv = platform_get_drvdata(pdev);
235 struct am654_hbmc_device_priv *dev_priv = priv->hbdev.priv;
236
237 hyperbus_unregister_device(&priv->hbdev);
238
239 if (priv->mux_ctrl)
240 mux_control_deselect(priv->mux_ctrl);
241
242 if (dev_priv->rx_chan)
243 dma_release_channel(dev_priv->rx_chan);
244}
245
246static const struct of_device_id am654_hbmc_dt_ids[] = {
247 {
248 .compatible = "ti,am654-hbmc",
249 },
250 { /* end of table */ }
251};
252
253MODULE_DEVICE_TABLE(of, am654_hbmc_dt_ids);
254
255static struct platform_driver am654_hbmc_platform_driver = {
256 .probe = am654_hbmc_probe,
257 .remove_new = am654_hbmc_remove,
258 .driver = {
259 .name = "hbmc-am654",
260 .of_match_table = am654_hbmc_dt_ids,
261 },
262};
263
264module_platform_driver(am654_hbmc_platform_driver);
265
266MODULE_DESCRIPTION("HBMC driver for AM654 SoC");
267MODULE_LICENSE("GPL v2");
268MODULE_ALIAS("platform:hbmc-am654");
269MODULE_AUTHOR("Vignesh Raghavendra <vigneshr@ti.com>");
1// SPDX-License-Identifier: GPL-2.0
2//
3// Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com/
4// Author: Vignesh Raghavendra <vigneshr@ti.com>
5
6#include <linux/err.h>
7#include <linux/kernel.h>
8#include <linux/module.h>
9#include <linux/mtd/cfi.h>
10#include <linux/mtd/hyperbus.h>
11#include <linux/mtd/mtd.h>
12#include <linux/mux/consumer.h>
13#include <linux/of.h>
14#include <linux/platform_device.h>
15#include <linux/pm_runtime.h>
16#include <linux/types.h>
17
18#define AM654_HBMC_CALIB_COUNT 25
19
20struct am654_hbmc_priv {
21 struct hyperbus_ctlr ctlr;
22 struct hyperbus_device hbdev;
23 struct mux_control *mux_ctrl;
24};
25
26static int am654_hbmc_calibrate(struct hyperbus_device *hbdev)
27{
28 struct map_info *map = &hbdev->map;
29 struct cfi_private cfi;
30 int count = AM654_HBMC_CALIB_COUNT;
31 int pass_count = 0;
32 int ret;
33
34 cfi.interleave = 1;
35 cfi.device_type = CFI_DEVICETYPE_X16;
36 cfi_send_gen_cmd(0xF0, 0, 0, map, &cfi, cfi.device_type, NULL);
37 cfi_send_gen_cmd(0x98, 0x55, 0, map, &cfi, cfi.device_type, NULL);
38
39 while (count--) {
40 ret = cfi_qry_present(map, 0, &cfi);
41 if (ret)
42 pass_count++;
43 else
44 pass_count = 0;
45 if (pass_count == 5)
46 break;
47 }
48
49 cfi_qry_mode_off(0, map, &cfi);
50
51 return ret;
52}
53
54static const struct hyperbus_ops am654_hbmc_ops = {
55 .calibrate = am654_hbmc_calibrate,
56};
57
58static int am654_hbmc_probe(struct platform_device *pdev)
59{
60 struct device *dev = &pdev->dev;
61 struct am654_hbmc_priv *priv;
62 int ret;
63
64 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
65 if (!priv)
66 return -ENOMEM;
67
68 platform_set_drvdata(pdev, priv);
69
70 if (of_property_read_bool(dev->of_node, "mux-controls")) {
71 struct mux_control *control = devm_mux_control_get(dev, NULL);
72
73 if (IS_ERR(control))
74 return PTR_ERR(control);
75
76 ret = mux_control_select(control, 1);
77 if (ret) {
78 dev_err(dev, "Failed to select HBMC mux\n");
79 return ret;
80 }
81 priv->mux_ctrl = control;
82 }
83
84 pm_runtime_enable(dev);
85 ret = pm_runtime_get_sync(dev);
86 if (ret < 0) {
87 pm_runtime_put_noidle(dev);
88 goto disable_pm;
89 }
90
91 priv->ctlr.dev = dev;
92 priv->ctlr.ops = &am654_hbmc_ops;
93 priv->hbdev.ctlr = &priv->ctlr;
94 priv->hbdev.np = of_get_next_child(dev->of_node, NULL);
95 ret = hyperbus_register_device(&priv->hbdev);
96 if (ret) {
97 dev_err(dev, "failed to register controller\n");
98 pm_runtime_put_sync(&pdev->dev);
99 goto disable_pm;
100 }
101
102 return 0;
103disable_pm:
104 pm_runtime_disable(dev);
105 if (priv->mux_ctrl)
106 mux_control_deselect(priv->mux_ctrl);
107 return ret;
108}
109
110static int am654_hbmc_remove(struct platform_device *pdev)
111{
112 struct am654_hbmc_priv *priv = platform_get_drvdata(pdev);
113 int ret;
114
115 ret = hyperbus_unregister_device(&priv->hbdev);
116 if (priv->mux_ctrl)
117 mux_control_deselect(priv->mux_ctrl);
118 pm_runtime_put_sync(&pdev->dev);
119 pm_runtime_disable(&pdev->dev);
120
121 return ret;
122}
123
124static const struct of_device_id am654_hbmc_dt_ids[] = {
125 {
126 .compatible = "ti,am654-hbmc",
127 },
128 { /* end of table */ }
129};
130
131MODULE_DEVICE_TABLE(of, am654_hbmc_dt_ids);
132
133static struct platform_driver am654_hbmc_platform_driver = {
134 .probe = am654_hbmc_probe,
135 .remove = am654_hbmc_remove,
136 .driver = {
137 .name = "hbmc-am654",
138 .of_match_table = am654_hbmc_dt_ids,
139 },
140};
141
142module_platform_driver(am654_hbmc_platform_driver);
143
144MODULE_DESCRIPTION("HBMC driver for AM654 SoC");
145MODULE_LICENSE("GPL v2");
146MODULE_ALIAS("platform:hbmc-am654");
147MODULE_AUTHOR("Vignesh Raghavendra <vigneshr@ti.com>");