1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (c) 2018, NVIDIA CORPORATION. 4 */ 5 6 #include <linux/interrupt.h> 7 #include <linux/irq.h> 8 #include <linux/io.h> 9 #include <linux/of.h> 10 #include <linux/platform_device.h> 11 12 #include <soc/tegra/bpmp.h> 13 14 #include "bpmp-private.h" 15 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 20 21 #define STA_OFFSET 0 22 #define SET_OFFSET 4 23 #define CLR_OFFSET 8 24 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)) 30 31 struct tegra210_bpmp { 32 void __iomem *atomics; 33 void __iomem *arb_sema; 34 struct irq_data *tx_irq_data; 35 }; 36 37 static u32 bpmp_channel_status(struct tegra_bpmp *bpmp, unsigned int index) 38 { 39 struct tegra210_bpmp *priv = bpmp->priv; 40 41 return __raw_readl(priv->arb_sema + STA_OFFSET) & CH_MASK(index); 42 } 43 44 static bool tegra210_bpmp_is_response_ready(struct tegra_bpmp_channel *channel) 45 { 46 unsigned int index = channel->index; 47 48 return bpmp_channel_status(channel->bpmp, index) == MA_ACKD(index); 49 } 50 51 static bool tegra210_bpmp_is_request_ready(struct tegra_bpmp_channel *channel) 52 { 53 unsigned int index = channel->index; 54 55 return bpmp_channel_status(channel->bpmp, index) == SL_SIGL(index); 56 } 57 58 static bool 59 tegra210_bpmp_is_request_channel_free(struct tegra_bpmp_channel *channel) 60 { 61 unsigned int index = channel->index; 62 63 return bpmp_channel_status(channel->bpmp, index) == MA_FREE(index); 64 } 65 66 static bool 67 tegra210_bpmp_is_response_channel_free(struct tegra_bpmp_channel *channel) 68 { 69 unsigned int index = channel->index; 70 71 return bpmp_channel_status(channel->bpmp, index) == SL_QUED(index); 72 } 73 74 static int tegra210_bpmp_post_request(struct tegra_bpmp_channel *channel) 75 { 76 struct tegra210_bpmp *priv = channel->bpmp->priv; 77 78 __raw_writel(CH_MASK(channel->index), priv->arb_sema + CLR_OFFSET); 79 80 return 0; 81 } 82 83 static int tegra210_bpmp_post_response(struct tegra_bpmp_channel *channel) 84 { 85 struct tegra210_bpmp *priv = channel->bpmp->priv; 86 87 __raw_writel(MA_ACKD(channel->index), priv->arb_sema + SET_OFFSET); 88 89 return 0; 90 } 91 92 static int tegra210_bpmp_ack_response(struct tegra_bpmp_channel *channel) 93 { 94 struct tegra210_bpmp *priv = channel->bpmp->priv; 95 96 __raw_writel(MA_ACKD(channel->index) ^ MA_FREE(channel->index), 97 priv->arb_sema + CLR_OFFSET); 98 99 return 0; 100 } 101 102 static int tegra210_bpmp_ack_request(struct tegra_bpmp_channel *channel) 103 { 104 struct tegra210_bpmp *priv = channel->bpmp->priv; 105 106 __raw_writel(SL_QUED(channel->index), priv->arb_sema + SET_OFFSET); 107 108 return 0; 109 } 110 111 static int tegra210_bpmp_ring_doorbell(struct tegra_bpmp *bpmp) 112 { 113 struct tegra210_bpmp *priv = bpmp->priv; 114 struct irq_data *irq_data = priv->tx_irq_data; 115 116 /* 117 * Tegra Legacy Interrupt Controller (LIC) is used to notify BPMP of 118 * available messages 119 */ 120 if (irq_data->chip->irq_retrigger) 121 return irq_data->chip->irq_retrigger(irq_data); 122 123 return -EINVAL; 124 } 125 126 static irqreturn_t rx_irq(int irq, void *data) 127 { 128 struct tegra_bpmp *bpmp = data; 129 130 tegra_bpmp_handle_rx(bpmp); 131 132 return IRQ_HANDLED; 133 } 134 135 static int tegra210_bpmp_channel_init(struct tegra_bpmp_channel *channel, 136 struct tegra_bpmp *bpmp, 137 unsigned int index) 138 { 139 struct tegra210_bpmp *priv = bpmp->priv; 140 u32 address; 141 void *p; 142 143 /* 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)); 147 148 p = devm_ioremap(bpmp->dev, address, 0x80); 149 if (!p) 150 return -ENOMEM; 151 152 channel->ib = p; 153 channel->ob = p; 154 channel->index = index; 155 init_completion(&channel->completion); 156 channel->bpmp = bpmp; 157 158 return 0; 159 } 160 161 static int tegra210_bpmp_init(struct tegra_bpmp *bpmp) 162 { 163 struct platform_device *pdev = to_platform_device(bpmp->dev); 164 struct tegra210_bpmp *priv; 165 unsigned int i; 166 int err; 167 168 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); 169 if (!priv) 170 return -ENOMEM; 171 172 bpmp->priv = priv; 173 174 priv->atomics = devm_platform_ioremap_resource(pdev, 0); 175 if (IS_ERR(priv->atomics)) 176 return PTR_ERR(priv->atomics); 177 178 priv->arb_sema = devm_platform_ioremap_resource(pdev, 1); 179 if (IS_ERR(priv->arb_sema)) 180 return PTR_ERR(priv->arb_sema); 181 182 err = tegra210_bpmp_channel_init(bpmp->tx_channel, bpmp, 183 bpmp->soc->channels.cpu_tx.offset); 184 if (err < 0) 185 return err; 186 187 err = tegra210_bpmp_channel_init(bpmp->rx_channel, bpmp, 188 bpmp->soc->channels.cpu_rx.offset); 189 if (err < 0) 190 return err; 191 192 for (i = 0; i < bpmp->threaded.count; i++) { 193 unsigned int index = bpmp->soc->channels.thread.offset + i; 194 195 err = tegra210_bpmp_channel_init(&bpmp->threaded_channels[i], 196 bpmp, index); 197 if (err < 0) 198 return err; 199 } 200 201 err = platform_get_irq_byname(pdev, "tx"); 202 if (err < 0) { 203 dev_err(&pdev->dev, "failed to get TX IRQ: %d\n", err); 204 return err; 205 } 206 207 priv->tx_irq_data = irq_get_irq_data(err); 208 if (!priv->tx_irq_data) { 209 dev_err(&pdev->dev, "failed to get IRQ data for TX IRQ\n"); 210 return -ENOENT; 211 } 212 213 err = platform_get_irq_byname(pdev, "rx"); 214 if (err < 0) { 215 dev_err(&pdev->dev, "failed to get rx IRQ: %d\n", err); 216 return err; 217 } 218 219 err = devm_request_irq(&pdev->dev, err, rx_irq, 220 IRQF_NO_SUSPEND, dev_name(&pdev->dev), bpmp); 221 if (err < 0) { 222 dev_err(&pdev->dev, "failed to request IRQ: %d\n", err); 223 return err; 224 } 225 226 return 0; 227 } 228 229 const struct tegra_bpmp_ops tegra210_bpmp_ops = { 230 .init = tegra210_bpmp_init, 231 .is_response_ready = tegra210_bpmp_is_response_ready, 232 .is_request_ready = tegra210_bpmp_is_request_ready, 233 .ack_response = tegra210_bpmp_ack_response, 234 .ack_request = tegra210_bpmp_ack_request, 235 .is_response_channel_free = tegra210_bpmp_is_response_channel_free, 236 .is_request_channel_free = tegra210_bpmp_is_request_channel_free, 237 .post_response = tegra210_bpmp_post_response, 238 .post_request = tegra210_bpmp_post_request, 239 .ring_doorbell = tegra210_bpmp_ring_doorbell, 240 }; 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