1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * IMG parallel output controller driver 4 * 5 * Copyright (C) 2015 Imagination Technologies Ltd. 6 * 7 * Author: Damien Horsley <Damien.Horsley@imgtec.com> 8 */ 9 10 #include <linux/clk.h> 11 #include <linux/init.h> 12 #include <linux/kernel.h> 13 #include <linux/module.h> 14 #include <linux/of.h> 15 #include <linux/platform_device.h> 16 #include <linux/pm_runtime.h> 17 #include <linux/reset.h> 18 19 #include <sound/core.h> 20 #include <sound/dmaengine_pcm.h> 21 #include <sound/initval.h> 22 #include <sound/pcm.h> 23 #include <sound/pcm_params.h> 24 #include <sound/soc.h> 25 26 #define IMG_PRL_OUT_TX_FIFO 0 27 28 #define IMG_PRL_OUT_CTL 0x4 29 #define IMG_PRL_OUT_CTL_CH_MASK BIT(4) 30 #define IMG_PRL_OUT_CTL_PACKH_MASK BIT(3) 31 #define IMG_PRL_OUT_CTL_EDGE_MASK BIT(2) 32 #define IMG_PRL_OUT_CTL_ME_MASK BIT(1) 33 #define IMG_PRL_OUT_CTL_SRST_MASK BIT(0) 34 35 struct img_prl_out { 36 void __iomem *base; 37 struct clk *clk_sys; 38 struct clk *clk_ref; 39 struct snd_dmaengine_dai_dma_data dma_data; 40 struct device *dev; 41 struct reset_control *rst; 42 }; 43 44 static int img_prl_out_suspend(struct device *dev) 45 { 46 struct img_prl_out *prl = dev_get_drvdata(dev); 47 48 clk_disable_unprepare(prl->clk_ref); 49 50 return 0; 51 } 52 53 static int img_prl_out_resume(struct device *dev) 54 { 55 struct img_prl_out *prl = dev_get_drvdata(dev); 56 int ret; 57 58 ret = clk_prepare_enable(prl->clk_ref); 59 if (ret) { 60 dev_err(dev, "clk_enable failed: %d\n", ret); 61 return ret; 62 } 63 64 return 0; 65 } 66 67 static inline void img_prl_out_writel(struct img_prl_out *prl, 68 u32 val, u32 reg) 69 { 70 writel(val, prl->base + reg); 71 } 72 73 static inline u32 img_prl_out_readl(struct img_prl_out *prl, u32 reg) 74 { 75 return readl(prl->base + reg); 76 } 77 78 static void img_prl_out_reset(struct img_prl_out *prl) 79 { 80 u32 ctl; 81 82 ctl = img_prl_out_readl(prl, IMG_PRL_OUT_CTL) & 83 ~IMG_PRL_OUT_CTL_ME_MASK; 84 85 reset_control_assert(prl->rst); 86 reset_control_deassert(prl->rst); 87 88 img_prl_out_writel(prl, ctl, IMG_PRL_OUT_CTL); 89 } 90 91 static int img_prl_out_trigger(struct snd_pcm_substream *substream, int cmd, 92 struct snd_soc_dai *dai) 93 { 94 struct img_prl_out *prl = snd_soc_dai_get_drvdata(dai); 95 u32 reg; 96 97 switch (cmd) { 98 case SNDRV_PCM_TRIGGER_START: 99 case SNDRV_PCM_TRIGGER_RESUME: 100 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 101 reg = img_prl_out_readl(prl, IMG_PRL_OUT_CTL); 102 reg |= IMG_PRL_OUT_CTL_ME_MASK; 103 img_prl_out_writel(prl, reg, IMG_PRL_OUT_CTL); 104 break; 105 case SNDRV_PCM_TRIGGER_STOP: 106 case SNDRV_PCM_TRIGGER_SUSPEND: 107 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 108 img_prl_out_reset(prl); 109 break; 110 default: 111 return -EINVAL; 112 } 113 114 return 0; 115 } 116 117 static int img_prl_out_hw_params(struct snd_pcm_substream *substream, 118 struct snd_pcm_hw_params *params, struct snd_soc_dai *dai) 119 { 120 struct img_prl_out *prl = snd_soc_dai_get_drvdata(dai); 121 unsigned int rate, channels; 122 u32 reg, control_set = 0; 123 124 rate = params_rate(params); 125 channels = params_channels(params); 126 127 switch (params_format(params)) { 128 case SNDRV_PCM_FORMAT_S32_LE: 129 control_set |= IMG_PRL_OUT_CTL_PACKH_MASK; 130 break; 131 case SNDRV_PCM_FORMAT_S24_LE: 132 break; 133 default: 134 return -EINVAL; 135 } 136 137 if (channels != 2) 138 return -EINVAL; 139 140 clk_set_rate(prl->clk_ref, rate * 256); 141 142 reg = img_prl_out_readl(prl, IMG_PRL_OUT_CTL); 143 reg = (reg & ~IMG_PRL_OUT_CTL_PACKH_MASK) | control_set; 144 img_prl_out_writel(prl, reg, IMG_PRL_OUT_CTL); 145 146 return 0; 147 } 148 149 static int img_prl_out_set_fmt(struct snd_soc_dai *dai, unsigned int fmt) 150 { 151 struct img_prl_out *prl = snd_soc_dai_get_drvdata(dai); 152 u32 reg, control_set = 0; 153 int ret; 154 155 switch (fmt & SND_SOC_DAIFMT_INV_MASK) { 156 case SND_SOC_DAIFMT_NB_NF: 157 break; 158 case SND_SOC_DAIFMT_NB_IF: 159 control_set |= IMG_PRL_OUT_CTL_EDGE_MASK; 160 break; 161 default: 162 return -EINVAL; 163 } 164 165 ret = pm_runtime_get_sync(prl->dev); 166 if (ret < 0) 167 return ret; 168 169 reg = img_prl_out_readl(prl, IMG_PRL_OUT_CTL); 170 reg = (reg & ~IMG_PRL_OUT_CTL_EDGE_MASK) | control_set; 171 img_prl_out_writel(prl, reg, IMG_PRL_OUT_CTL); 172 pm_runtime_put(prl->dev); 173 174 return 0; 175 } 176 177 static const struct snd_soc_dai_ops img_prl_out_dai_ops = { 178 .trigger = img_prl_out_trigger, 179 .hw_params = img_prl_out_hw_params, 180 .set_fmt = img_prl_out_set_fmt 181 }; 182 183 static int img_prl_out_dai_probe(struct snd_soc_dai *dai) 184 { 185 struct img_prl_out *prl = snd_soc_dai_get_drvdata(dai); 186 187 snd_soc_dai_init_dma_data(dai, &prl->dma_data, NULL); 188 189 return 0; 190 } 191 192 static struct snd_soc_dai_driver img_prl_out_dai = { 193 .probe = img_prl_out_dai_probe, 194 .playback = { 195 .channels_min = 2, 196 .channels_max = 2, 197 .rates = SNDRV_PCM_RATE_8000_192000, 198 .formats = SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S24_LE 199 }, 200 .ops = &img_prl_out_dai_ops 201 }; 202 203 static const struct snd_soc_component_driver img_prl_out_component = { 204 .name = "img-prl-out" 205 }; 206 207 static int img_prl_out_probe(struct platform_device *pdev) 208 { 209 struct img_prl_out *prl; 210 struct resource *res; 211 void __iomem *base; 212 int ret; 213 struct device *dev = &pdev->dev; 214 215 prl = devm_kzalloc(&pdev->dev, sizeof(*prl), GFP_KERNEL); 216 if (!prl) 217 return -ENOMEM; 218 219 platform_set_drvdata(pdev, prl); 220 221 prl->dev = &pdev->dev; 222 223 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 224 base = devm_ioremap_resource(&pdev->dev, res); 225 if (IS_ERR(base)) 226 return PTR_ERR(base); 227 228 prl->base = base; 229 230 prl->rst = devm_reset_control_get_exclusive(&pdev->dev, "rst"); 231 if (IS_ERR(prl->rst)) { 232 if (PTR_ERR(prl->rst) != -EPROBE_DEFER) 233 dev_err(&pdev->dev, "No top level reset found\n"); 234 return PTR_ERR(prl->rst); 235 } 236 237 prl->clk_sys = devm_clk_get(&pdev->dev, "sys"); 238 if (IS_ERR(prl->clk_sys)) { 239 if (PTR_ERR(prl->clk_sys) != -EPROBE_DEFER) 240 dev_err(dev, "Failed to acquire clock 'sys'\n"); 241 return PTR_ERR(prl->clk_sys); 242 } 243 244 prl->clk_ref = devm_clk_get(&pdev->dev, "ref"); 245 if (IS_ERR(prl->clk_ref)) { 246 if (PTR_ERR(prl->clk_ref) != -EPROBE_DEFER) 247 dev_err(dev, "Failed to acquire clock 'ref'\n"); 248 return PTR_ERR(prl->clk_ref); 249 } 250 251 ret = clk_prepare_enable(prl->clk_sys); 252 if (ret) 253 return ret; 254 255 img_prl_out_writel(prl, IMG_PRL_OUT_CTL_EDGE_MASK, IMG_PRL_OUT_CTL); 256 img_prl_out_reset(prl); 257 258 pm_runtime_enable(&pdev->dev); 259 if (!pm_runtime_enabled(&pdev->dev)) { 260 ret = img_prl_out_resume(&pdev->dev); 261 if (ret) 262 goto err_pm_disable; 263 } 264 265 prl->dma_data.addr = res->start + IMG_PRL_OUT_TX_FIFO; 266 prl->dma_data.addr_width = 4; 267 prl->dma_data.maxburst = 4; 268 269 ret = devm_snd_soc_register_component(&pdev->dev, 270 &img_prl_out_component, 271 &img_prl_out_dai, 1); 272 if (ret) 273 goto err_suspend; 274 275 ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0); 276 if (ret) 277 goto err_suspend; 278 279 return 0; 280 281 err_suspend: 282 if (!pm_runtime_status_suspended(&pdev->dev)) 283 img_prl_out_suspend(&pdev->dev); 284 err_pm_disable: 285 pm_runtime_disable(&pdev->dev); 286 clk_disable_unprepare(prl->clk_sys); 287 288 return ret; 289 } 290 291 static int img_prl_out_dev_remove(struct platform_device *pdev) 292 { 293 struct img_prl_out *prl = platform_get_drvdata(pdev); 294 295 pm_runtime_disable(&pdev->dev); 296 if (!pm_runtime_status_suspended(&pdev->dev)) 297 img_prl_out_suspend(&pdev->dev); 298 299 clk_disable_unprepare(prl->clk_sys); 300 301 return 0; 302 } 303 304 static const struct of_device_id img_prl_out_of_match[] = { 305 { .compatible = "img,parallel-out" }, 306 {} 307 }; 308 MODULE_DEVICE_TABLE(of, img_prl_out_of_match); 309 310 static const struct dev_pm_ops img_prl_out_pm_ops = { 311 SET_RUNTIME_PM_OPS(img_prl_out_suspend, 312 img_prl_out_resume, NULL) 313 }; 314 315 static struct platform_driver img_prl_out_driver = { 316 .driver = { 317 .name = "img-parallel-out", 318 .of_match_table = img_prl_out_of_match, 319 .pm = &img_prl_out_pm_ops 320 }, 321 .probe = img_prl_out_probe, 322 .remove = img_prl_out_dev_remove 323 }; 324 module_platform_driver(img_prl_out_driver); 325 326 MODULE_AUTHOR("Damien Horsley <Damien.Horsley@imgtec.com>"); 327 MODULE_DESCRIPTION("IMG Parallel Output Driver"); 328 MODULE_LICENSE("GPL v2"); 329