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