1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (c) 2018, NVIDIA CORPORATION.
6 #include <linux/interrupt.h>
10 #include <linux/platform_device.h>
12 #include <soc/tegra/bpmp.h>
14 #include "bpmp-private.h"
16 #define TRIGGER_OFFSET 0x000
17 #define RESULT_OFFSET(id) (0xc00 + id * 4)
18 #define TRIGGER_ID_SHIFT 16
19 #define TRIGGER_CMD_GET 4
25 #define CH_MASK(ch) (0x3 << ((ch) * 2))
26 #define SL_SIGL(ch) (0x0 << ((ch) * 2))
27 #define SL_QUED(ch) (0x1 << ((ch) * 2))
28 #define MA_FREE(ch) (0x2 << ((ch) * 2))
29 #define MA_ACKD(ch) (0x3 << ((ch) * 2))
31 struct tegra210_bpmp {
32 void __iomem *atomics;
33 void __iomem *arb_sema;
34 struct irq_data *tx_irq_data;
37 static u32 bpmp_channel_status(struct tegra_bpmp *bpmp, unsigned int index)
39 struct tegra210_bpmp *priv = bpmp->priv;
41 return __raw_readl(priv->arb_sema + STA_OFFSET) & CH_MASK(index);
44 static bool tegra210_bpmp_is_response_ready(struct tegra_bpmp_channel *channel)
46 unsigned int index = channel->index;
48 return bpmp_channel_status(channel->bpmp, index) == MA_ACKD(index);
51 static bool tegra210_bpmp_is_request_ready(struct tegra_bpmp_channel *channel)
53 unsigned int index = channel->index;
55 return bpmp_channel_status(channel->bpmp, index) == SL_SIGL(index);
59 tegra210_bpmp_is_request_channel_free(struct tegra_bpmp_channel *channel)
61 unsigned int index = channel->index;
63 return bpmp_channel_status(channel->bpmp, index) == MA_FREE(index);
67 tegra210_bpmp_is_response_channel_free(struct tegra_bpmp_channel *channel)
69 unsigned int index = channel->index;
71 return bpmp_channel_status(channel->bpmp, index) == SL_QUED(index);
74 static int tegra210_bpmp_post_request(struct tegra_bpmp_channel *channel)
76 struct tegra210_bpmp *priv = channel->bpmp->priv;
78 __raw_writel(CH_MASK(channel->index), priv->arb_sema + CLR_OFFSET);
83 static int tegra210_bpmp_post_response(struct tegra_bpmp_channel *channel)
85 struct tegra210_bpmp *priv = channel->bpmp->priv;
87 __raw_writel(MA_ACKD(channel->index), priv->arb_sema + SET_OFFSET);
92 static int tegra210_bpmp_ack_response(struct tegra_bpmp_channel *channel)
94 struct tegra210_bpmp *priv = channel->bpmp->priv;
96 __raw_writel(MA_ACKD(channel->index) ^ MA_FREE(channel->index),
97 priv->arb_sema + CLR_OFFSET);
102 static int tegra210_bpmp_ack_request(struct tegra_bpmp_channel *channel)
104 struct tegra210_bpmp *priv = channel->bpmp->priv;
106 __raw_writel(SL_QUED(channel->index), priv->arb_sema + SET_OFFSET);
111 static int tegra210_bpmp_ring_doorbell(struct tegra_bpmp *bpmp)
113 struct tegra210_bpmp *priv = bpmp->priv;
114 struct irq_data *irq_data = priv->tx_irq_data;
117 * Tegra Legacy Interrupt Controller (LIC) is used to notify BPMP of
120 if (irq_data->chip->irq_retrigger)
121 return irq_data->chip->irq_retrigger(irq_data);
126 static irqreturn_t rx_irq(int irq, void *data)
128 struct tegra_bpmp *bpmp = data;
130 tegra_bpmp_handle_rx(bpmp);
135 static int tegra210_bpmp_channel_init(struct tegra_bpmp_channel *channel,
136 struct tegra_bpmp *bpmp,
139 struct tegra210_bpmp *priv = bpmp->priv;
143 /* Retrieve channel base address from BPMP */
144 writel(index << TRIGGER_ID_SHIFT | TRIGGER_CMD_GET,
145 priv->atomics + TRIGGER_OFFSET);
146 address = readl(priv->atomics + RESULT_OFFSET(index));
148 p = devm_ioremap(bpmp->dev, address, 0x80);
152 iosys_map_set_vaddr_iomem(&channel->ib, p);
153 iosys_map_set_vaddr_iomem(&channel->ob, p);
155 channel->index = index;
156 init_completion(&channel->completion);
157 channel->bpmp = bpmp;
162 static int tegra210_bpmp_init(struct tegra_bpmp *bpmp)
164 struct platform_device *pdev = to_platform_device(bpmp->dev);
165 struct tegra210_bpmp *priv;
169 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
175 priv->atomics = devm_platform_ioremap_resource(pdev, 0);
176 if (IS_ERR(priv->atomics))
177 return PTR_ERR(priv->atomics);
179 priv->arb_sema = devm_platform_ioremap_resource(pdev, 1);
180 if (IS_ERR(priv->arb_sema))
181 return PTR_ERR(priv->arb_sema);
183 err = tegra210_bpmp_channel_init(bpmp->tx_channel, bpmp,
184 bpmp->soc->channels.cpu_tx.offset);
188 err = tegra210_bpmp_channel_init(bpmp->rx_channel, bpmp,
189 bpmp->soc->channels.cpu_rx.offset);
193 for (i = 0; i < bpmp->threaded.count; i++) {
194 unsigned int index = bpmp->soc->channels.thread.offset + i;
196 err = tegra210_bpmp_channel_init(&bpmp->threaded_channels[i],
202 err = platform_get_irq_byname(pdev, "tx");
206 priv->tx_irq_data = irq_get_irq_data(err);
207 if (!priv->tx_irq_data) {
208 dev_err(&pdev->dev, "failed to get IRQ data for TX IRQ\n");
212 err = platform_get_irq_byname(pdev, "rx");
216 err = devm_request_irq(&pdev->dev, err, rx_irq,
217 IRQF_NO_SUSPEND, dev_name(&pdev->dev), bpmp);
219 dev_err(&pdev->dev, "failed to request IRQ: %d\n", err);
226 const struct tegra_bpmp_ops tegra210_bpmp_ops = {
227 .init = tegra210_bpmp_init,
228 .is_response_ready = tegra210_bpmp_is_response_ready,
229 .is_request_ready = tegra210_bpmp_is_request_ready,
230 .ack_response = tegra210_bpmp_ack_response,
231 .ack_request = tegra210_bpmp_ack_request,
232 .is_response_channel_free = tegra210_bpmp_is_response_channel_free,
233 .is_request_channel_free = tegra210_bpmp_is_request_channel_free,
234 .post_response = tegra210_bpmp_post_response,
235 .post_request = tegra210_bpmp_post_request,
236 .ring_doorbell = tegra210_bpmp_ring_doorbell,