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0001 // SPDX-License-Identifier: GPL-2.0
0002 //
0003 // Renesas R-Car SSIU support
0004 //
0005 // Copyright (c) 2015 Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
0006 
0007 #include "rsnd.h"
0008 
0009 #define SSIU_NAME "ssiu"
0010 
0011 struct rsnd_ssiu {
0012     struct rsnd_mod mod;
0013     u32 busif_status[8]; /* for BUSIF0 - BUSIF7 */
0014     unsigned int usrcnt;
0015     int id;
0016     int id_sub;
0017 };
0018 
0019 /* SSI_MODE */
0020 #define TDM_EXT     (1 << 0)
0021 #define TDM_SPLIT   (1 << 8)
0022 
0023 #define rsnd_ssiu_nr(priv) ((priv)->ssiu_nr)
0024 #define rsnd_mod_to_ssiu(_mod) container_of((_mod), struct rsnd_ssiu, mod)
0025 #define for_each_rsnd_ssiu(pos, priv, i)                \
0026     for (i = 0;                         \
0027          (i < rsnd_ssiu_nr(priv)) &&                \
0028              ((pos) = ((struct rsnd_ssiu *)(priv)->ssiu + i));  \
0029          i++)
0030 
0031 /*
0032  *  SSI Gen2        Gen3
0033  *  0   BUSIF0-3    BUSIF0-7
0034  *  1   BUSIF0-3    BUSIF0-7
0035  *  2   BUSIF0-3    BUSIF0-7
0036  *  3   BUSIF0      BUSIF0-7
0037  *  4   BUSIF0      BUSIF0-7
0038  *  5   BUSIF0      BUSIF0
0039  *  6   BUSIF0      BUSIF0
0040  *  7   BUSIF0      BUSIF0
0041  *  8   BUSIF0      BUSIF0
0042  *  9   BUSIF0-3    BUSIF0-7
0043  *  total   22      52
0044  */
0045 static const int gen2_id[] = { 0, 4,  8, 12, 13, 14, 15, 16, 17, 18 };
0046 static const int gen3_id[] = { 0, 8, 16, 24, 32, 40, 41, 42, 43, 44 };
0047 
0048 /* enable busif buffer over/under run interrupt. */
0049 #define rsnd_ssiu_busif_err_irq_enable(mod)  rsnd_ssiu_busif_err_irq_ctrl(mod, 1)
0050 #define rsnd_ssiu_busif_err_irq_disable(mod) rsnd_ssiu_busif_err_irq_ctrl(mod, 0)
0051 static void rsnd_ssiu_busif_err_irq_ctrl(struct rsnd_mod *mod, int enable)
0052 {
0053     int id = rsnd_mod_id(mod);
0054     int shift, offset;
0055     int i;
0056 
0057     switch (id) {
0058     case 0:
0059     case 1:
0060     case 2:
0061     case 3:
0062     case 4:
0063         shift  = id;
0064         offset = 0;
0065         break;
0066     case 9:
0067         shift  = 1;
0068         offset = 1;
0069         break;
0070     default:
0071         return;
0072     }
0073 
0074     for (i = 0; i < 4; i++) {
0075         enum rsnd_reg reg = SSI_SYS_INT_ENABLE((i * 2) + offset);
0076         u32 val = 0xf << (shift * 4);
0077         u32 sys_int_enable = rsnd_mod_read(mod, reg);
0078 
0079         if (enable)
0080             sys_int_enable |= val;
0081         else
0082             sys_int_enable &= ~val;
0083         rsnd_mod_write(mod, reg, sys_int_enable);
0084     }
0085 }
0086 
0087 bool rsnd_ssiu_busif_err_status_clear(struct rsnd_mod *mod)
0088 {
0089     bool error = false;
0090     int id = rsnd_mod_id(mod);
0091     int shift, offset;
0092     int i;
0093 
0094     switch (id) {
0095     case 0:
0096     case 1:
0097     case 2:
0098     case 3:
0099     case 4:
0100         shift  = id;
0101         offset = 0;
0102         break;
0103     case 9:
0104         shift  = 1;
0105         offset = 1;
0106         break;
0107     default:
0108         goto out;
0109     }
0110 
0111     for (i = 0; i < 4; i++) {
0112         u32 reg = SSI_SYS_STATUS(i * 2) + offset;
0113         u32 status = rsnd_mod_read(mod, reg);
0114         u32 val = 0xf << (shift * 4);
0115 
0116         status &= val;
0117         if (status) {
0118             struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
0119             struct device *dev = rsnd_priv_to_dev(priv);
0120 
0121             rsnd_print_irq_status(dev, "%s err status : 0x%08x\n",
0122                           rsnd_mod_name(mod), status);
0123             error = true;
0124         }
0125         rsnd_mod_write(mod, reg, val);
0126     }
0127 out:
0128     return error;
0129 }
0130 
0131 static u32 *rsnd_ssiu_get_status(struct rsnd_mod *mod,
0132                  struct rsnd_dai_stream *io,
0133                  enum rsnd_mod_type type)
0134 {
0135     struct rsnd_ssiu *ssiu = rsnd_mod_to_ssiu(mod);
0136     int busif = rsnd_mod_id_sub(mod);
0137 
0138     return &ssiu->busif_status[busif];
0139 }
0140 
0141 static int rsnd_ssiu_init(struct rsnd_mod *mod,
0142               struct rsnd_dai_stream *io,
0143               struct rsnd_priv *priv)
0144 {
0145     struct rsnd_dai *rdai = rsnd_io_to_rdai(io);
0146     u32 ssis = rsnd_ssi_multi_secondaries_runtime(io);
0147     int use_busif = rsnd_ssi_use_busif(io);
0148     int id = rsnd_mod_id(mod);
0149     int is_clk_master = rsnd_rdai_is_clk_master(rdai);
0150     u32 val1, val2;
0151 
0152     /* clear status */
0153     rsnd_ssiu_busif_err_status_clear(mod);
0154 
0155     /*
0156      * SSI_MODE0
0157      */
0158     rsnd_mod_bset(mod, SSI_MODE0, (1 << id), !use_busif << id);
0159 
0160     /*
0161      * SSI_MODE1 / SSI_MODE2
0162      *
0163      * FIXME
0164      * sharing/multi with SSI0 are mainly supported
0165      */
0166     val1 = rsnd_mod_read(mod, SSI_MODE1);
0167     val2 = rsnd_mod_read(mod, SSI_MODE2);
0168     if (rsnd_ssi_is_pin_sharing(io)) {
0169 
0170         ssis |= (1 << id);
0171 
0172     } else if (ssis) {
0173         /*
0174          * Multi SSI
0175          *
0176          * set synchronized bit here
0177          */
0178 
0179         /* SSI4 is synchronized with SSI3 */
0180         if (ssis & (1 << 4))
0181             val1 |= (1 << 20);
0182         /* SSI012 are synchronized */
0183         if (ssis == 0x0006)
0184             val1 |= (1 << 4);
0185         /* SSI0129 are synchronized */
0186         if (ssis == 0x0206)
0187             val2 |= (1 << 4);
0188     }
0189 
0190     /* SSI1 is sharing pin with SSI0 */
0191     if (ssis & (1 << 1))
0192         val1 |= is_clk_master ? 0x2 : 0x1;
0193 
0194     /* SSI2 is sharing pin with SSI0 */
0195     if (ssis & (1 << 2))
0196         val1 |= is_clk_master ? 0x2 << 2 :
0197                     0x1 << 2;
0198     /* SSI4 is sharing pin with SSI3 */
0199     if (ssis & (1 << 4))
0200         val1 |= is_clk_master ? 0x2 << 16 :
0201                     0x1 << 16;
0202     /* SSI9 is sharing pin with SSI0 */
0203     if (ssis & (1 << 9))
0204         val2 |= is_clk_master ? 0x2 : 0x1;
0205 
0206     rsnd_mod_bset(mod, SSI_MODE1, 0x0013001f, val1);
0207     rsnd_mod_bset(mod, SSI_MODE2, 0x00000017, val2);
0208 
0209     /*
0210      * Enable busif buffer over/under run interrupt.
0211      * It will be handled from ssi.c
0212      * see
0213      *  __rsnd_ssi_interrupt()
0214      */
0215     rsnd_ssiu_busif_err_irq_enable(mod);
0216 
0217     return 0;
0218 }
0219 
0220 static int rsnd_ssiu_quit(struct rsnd_mod *mod,
0221               struct rsnd_dai_stream *io,
0222               struct rsnd_priv *priv)
0223 {
0224     /* disable busif buffer over/under run interrupt. */
0225     rsnd_ssiu_busif_err_irq_disable(mod);
0226 
0227     return 0;
0228 }
0229 
0230 static struct rsnd_mod_ops rsnd_ssiu_ops_gen1 = {
0231     .name       = SSIU_NAME,
0232     .init       = rsnd_ssiu_init,
0233     .quit       = rsnd_ssiu_quit,
0234     .get_status = rsnd_ssiu_get_status,
0235 };
0236 
0237 static int rsnd_ssiu_init_gen2(struct rsnd_mod *mod,
0238                    struct rsnd_dai_stream *io,
0239                    struct rsnd_priv *priv)
0240 {
0241     struct rsnd_ssiu *ssiu = rsnd_mod_to_ssiu(mod);
0242     u32 has_hdmi0 = rsnd_flags_has(io, RSND_STREAM_HDMI0);
0243     u32 has_hdmi1 = rsnd_flags_has(io, RSND_STREAM_HDMI1);
0244     int ret;
0245     u32 mode = 0;
0246 
0247     ret = rsnd_ssiu_init(mod, io, priv);
0248     if (ret < 0)
0249         return ret;
0250 
0251     ssiu->usrcnt++;
0252 
0253     /*
0254      * TDM Extend/Split Mode
0255      * see
0256      *  rsnd_ssi_config_init()
0257      */
0258     if (rsnd_runtime_is_tdm(io))
0259         mode = TDM_EXT;
0260     else if (rsnd_runtime_is_tdm_split(io))
0261         mode = TDM_SPLIT;
0262 
0263     rsnd_mod_write(mod, SSI_MODE, mode);
0264 
0265     if (rsnd_ssi_use_busif(io)) {
0266         int id = rsnd_mod_id(mod);
0267         int busif = rsnd_mod_id_sub(mod);
0268         enum rsnd_reg adinr_reg, mode_reg, dalign_reg;
0269 
0270         if ((id == 9) && (busif >= 4)) {
0271             adinr_reg = SSI9_BUSIF_ADINR(busif);
0272             mode_reg = SSI9_BUSIF_MODE(busif);
0273             dalign_reg = SSI9_BUSIF_DALIGN(busif);
0274         } else {
0275             adinr_reg = SSI_BUSIF_ADINR(busif);
0276             mode_reg = SSI_BUSIF_MODE(busif);
0277             dalign_reg = SSI_BUSIF_DALIGN(busif);
0278         }
0279 
0280         rsnd_mod_write(mod, adinr_reg,
0281                    rsnd_get_adinr_bit(mod, io) |
0282                    (rsnd_io_is_play(io) ?
0283                 rsnd_runtime_channel_after_ctu(io) :
0284                 rsnd_runtime_channel_original(io)));
0285         rsnd_mod_write(mod, mode_reg,
0286                    rsnd_get_busif_shift(io, mod) | 1);
0287         rsnd_mod_write(mod, dalign_reg,
0288                    rsnd_get_dalign(mod, io));
0289     }
0290 
0291     if (has_hdmi0 || has_hdmi1) {
0292         enum rsnd_mod_type rsnd_ssi_array[] = {
0293             RSND_MOD_SSIM1,
0294             RSND_MOD_SSIM2,
0295             RSND_MOD_SSIM3,
0296         };
0297         struct rsnd_mod *ssi_mod = rsnd_io_to_mod_ssi(io);
0298         struct rsnd_mod *pos;
0299         u32 val;
0300         int i;
0301 
0302         i = rsnd_mod_id(ssi_mod);
0303 
0304         /* output all same SSI as default */
0305         val =   i << 16 |
0306             i << 20 |
0307             i << 24 |
0308             i << 28 |
0309             i;
0310 
0311         for_each_rsnd_mod_array(i, pos, io, rsnd_ssi_array) {
0312             int shift = (i * 4) + 20;
0313 
0314             val = (val & ~(0xF << shift)) |
0315                 rsnd_mod_id(pos) << shift;
0316         }
0317 
0318         if (has_hdmi0)
0319             rsnd_mod_write(mod, HDMI0_SEL, val);
0320         if (has_hdmi1)
0321             rsnd_mod_write(mod, HDMI1_SEL, val);
0322     }
0323 
0324     return 0;
0325 }
0326 
0327 static int rsnd_ssiu_start_gen2(struct rsnd_mod *mod,
0328                 struct rsnd_dai_stream *io,
0329                 struct rsnd_priv *priv)
0330 {
0331     int busif = rsnd_mod_id_sub(mod);
0332 
0333     if (!rsnd_ssi_use_busif(io))
0334         return 0;
0335 
0336     rsnd_mod_bset(mod, SSI_CTRL, 1 << (busif * 4), 1 << (busif * 4));
0337 
0338     if (rsnd_ssi_multi_secondaries_runtime(io))
0339         rsnd_mod_write(mod, SSI_CONTROL, 0x1);
0340 
0341     return 0;
0342 }
0343 
0344 static int rsnd_ssiu_stop_gen2(struct rsnd_mod *mod,
0345                    struct rsnd_dai_stream *io,
0346                    struct rsnd_priv *priv)
0347 {
0348     struct rsnd_ssiu *ssiu = rsnd_mod_to_ssiu(mod);
0349     int busif = rsnd_mod_id_sub(mod);
0350 
0351     if (!rsnd_ssi_use_busif(io))
0352         return 0;
0353 
0354     rsnd_mod_bset(mod, SSI_CTRL, 1 << (busif * 4), 0);
0355 
0356     if (--ssiu->usrcnt)
0357         return 0;
0358 
0359     if (rsnd_ssi_multi_secondaries_runtime(io))
0360         rsnd_mod_write(mod, SSI_CONTROL, 0);
0361 
0362     return 0;
0363 }
0364 
0365 static int rsnd_ssiu_id(struct rsnd_mod *mod)
0366 {
0367     struct rsnd_ssiu *ssiu = rsnd_mod_to_ssiu(mod);
0368 
0369     /* see rsnd_ssiu_probe() */
0370     return ssiu->id;
0371 }
0372 
0373 static int rsnd_ssiu_id_sub(struct rsnd_mod *mod)
0374 {
0375     struct rsnd_ssiu *ssiu = rsnd_mod_to_ssiu(mod);
0376 
0377     /* see rsnd_ssiu_probe() */
0378     return ssiu->id_sub;
0379 }
0380 
0381 static struct dma_chan *rsnd_ssiu_dma_req(struct rsnd_dai_stream *io,
0382                       struct rsnd_mod *mod)
0383 {
0384     struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
0385     int is_play = rsnd_io_is_play(io);
0386     char *name;
0387 
0388     /*
0389      * It should use "rcar_sound,ssiu" on DT.
0390      * But, we need to keep compatibility for old version.
0391      *
0392      * If it has "rcar_sound.ssiu", it will be used.
0393      * If not, "rcar_sound.ssi" will be used.
0394      * see
0395      *  rsnd_ssi_dma_req()
0396      *  rsnd_dma_of_path()
0397      */
0398 
0399     name = is_play ? "rx" : "tx";
0400 
0401     return rsnd_dma_request_channel(rsnd_ssiu_of_node(priv),
0402                     SSIU_NAME, mod, name);
0403 }
0404 
0405 #ifdef CONFIG_DEBUG_FS
0406 static void rsnd_ssiu_debug_info(struct seq_file *m,
0407                  struct rsnd_dai_stream *io,
0408                 struct rsnd_mod *mod)
0409 {
0410     rsnd_debugfs_mod_reg_show(m, mod, RSND_GEN2_SSIU,
0411                   rsnd_mod_id(mod) * 0x80, 0x80);
0412 }
0413 #define DEBUG_INFO .debug_info = rsnd_ssiu_debug_info
0414 #else
0415 #define DEBUG_INFO
0416 #endif
0417 
0418 static struct rsnd_mod_ops rsnd_ssiu_ops_gen2 = {
0419     .name       = SSIU_NAME,
0420     .dma_req    = rsnd_ssiu_dma_req,
0421     .init       = rsnd_ssiu_init_gen2,
0422     .quit       = rsnd_ssiu_quit,
0423     .start      = rsnd_ssiu_start_gen2,
0424     .stop       = rsnd_ssiu_stop_gen2,
0425     .get_status = rsnd_ssiu_get_status,
0426     DEBUG_INFO
0427 };
0428 
0429 static struct rsnd_mod *rsnd_ssiu_mod_get(struct rsnd_priv *priv, int id)
0430 {
0431     if (WARN_ON(id < 0 || id >= rsnd_ssiu_nr(priv)))
0432         id = 0;
0433 
0434     return rsnd_mod_get((struct rsnd_ssiu *)(priv->ssiu) + id);
0435 }
0436 
0437 static void rsnd_parse_connect_ssiu_compatible(struct rsnd_priv *priv,
0438                            struct rsnd_dai_stream *io)
0439 {
0440     struct rsnd_mod *ssi_mod = rsnd_io_to_mod_ssi(io);
0441     struct rsnd_ssiu *ssiu;
0442     int is_dma_mode;
0443     int i;
0444 
0445     if (!ssi_mod)
0446         return;
0447 
0448     is_dma_mode = rsnd_ssi_is_dma_mode(ssi_mod);
0449 
0450     /* select BUSIF0 */
0451     for_each_rsnd_ssiu(ssiu, priv, i) {
0452         struct rsnd_mod *mod = rsnd_mod_get(ssiu);
0453 
0454         if (is_dma_mode &&
0455             (rsnd_mod_id(ssi_mod) == rsnd_mod_id(mod)) &&
0456             (rsnd_mod_id_sub(mod) == 0)) {
0457             rsnd_dai_connect(mod, io, mod->type);
0458             return;
0459         }
0460     }
0461 }
0462 
0463 void rsnd_parse_connect_ssiu(struct rsnd_dai *rdai,
0464                  struct device_node *playback,
0465                  struct device_node *capture)
0466 {
0467     struct rsnd_priv *priv = rsnd_rdai_to_priv(rdai);
0468     struct device *dev = rsnd_priv_to_dev(priv);
0469     struct device_node *node = rsnd_ssiu_of_node(priv);
0470     struct rsnd_dai_stream *io_p = &rdai->playback;
0471     struct rsnd_dai_stream *io_c = &rdai->capture;
0472 
0473     /* use rcar_sound,ssiu if exist */
0474     if (node) {
0475         struct device_node *np;
0476         int i = 0;
0477 
0478         for_each_child_of_node(node, np) {
0479             struct rsnd_mod *mod;
0480 
0481             i = rsnd_node_fixed_index(dev, np, SSIU_NAME, i);
0482             if (i < 0) {
0483                 of_node_put(np);
0484                 break;
0485             }
0486 
0487             mod = rsnd_ssiu_mod_get(priv, i);
0488 
0489             if (np == playback)
0490                 rsnd_dai_connect(mod, io_p, mod->type);
0491             if (np == capture)
0492                 rsnd_dai_connect(mod, io_c, mod->type);
0493             i++;
0494         }
0495 
0496         of_node_put(node);
0497     }
0498 
0499     /* Keep DT compatibility */
0500     if (!rsnd_io_to_mod_ssiu(io_p))
0501         rsnd_parse_connect_ssiu_compatible(priv, io_p);
0502     if (!rsnd_io_to_mod_ssiu(io_c))
0503         rsnd_parse_connect_ssiu_compatible(priv, io_c);
0504 }
0505 
0506 int rsnd_ssiu_probe(struct rsnd_priv *priv)
0507 {
0508     struct device *dev = rsnd_priv_to_dev(priv);
0509     struct device_node *node;
0510     struct rsnd_ssiu *ssiu;
0511     struct rsnd_mod_ops *ops;
0512     const int *list = NULL;
0513     int i, nr;
0514 
0515     /*
0516      * Keep DT compatibility.
0517      * if it has "rcar_sound,ssiu", use it.
0518      * if not, use "rcar_sound,ssi"
0519      * see
0520      *  rsnd_ssiu_bufsif_to_id()
0521      */
0522     node = rsnd_ssiu_of_node(priv);
0523     if (node)
0524         nr = rsnd_node_count(priv, node, SSIU_NAME);
0525     else
0526         nr = priv->ssi_nr;
0527 
0528     if (!nr)
0529         return -EINVAL;
0530 
0531     ssiu    = devm_kcalloc(dev, nr, sizeof(*ssiu), GFP_KERNEL);
0532     if (!ssiu)
0533         return -ENOMEM;
0534 
0535     priv->ssiu  = ssiu;
0536     priv->ssiu_nr   = nr;
0537 
0538     if (rsnd_is_gen1(priv))
0539         ops = &rsnd_ssiu_ops_gen1;
0540     else
0541         ops = &rsnd_ssiu_ops_gen2;
0542 
0543     /* Keep compatibility */
0544     nr = 0;
0545     if ((node) &&
0546         (ops == &rsnd_ssiu_ops_gen2)) {
0547         ops->id     = rsnd_ssiu_id;
0548         ops->id_sub = rsnd_ssiu_id_sub;
0549 
0550         if (rsnd_is_gen2(priv)) {
0551             list    = gen2_id;
0552             nr  = ARRAY_SIZE(gen2_id);
0553         } else if (rsnd_is_gen3(priv)) {
0554             list    = gen3_id;
0555             nr  = ARRAY_SIZE(gen3_id);
0556         } else {
0557             dev_err(dev, "unknown SSIU\n");
0558             return -ENODEV;
0559         }
0560     }
0561 
0562     for_each_rsnd_ssiu(ssiu, priv, i) {
0563         int ret;
0564 
0565         if (node) {
0566             int j;
0567 
0568             /*
0569              * see
0570              *  rsnd_ssiu_get_id()
0571              *  rsnd_ssiu_get_id_sub()
0572              */
0573             for (j = 0; j < nr; j++) {
0574                 if (list[j] > i)
0575                     break;
0576                 ssiu->id    = j;
0577                 ssiu->id_sub    = i - list[ssiu->id];
0578             }
0579         } else {
0580             ssiu->id = i;
0581         }
0582 
0583         ret = rsnd_mod_init(priv, rsnd_mod_get(ssiu),
0584                     ops, NULL, RSND_MOD_SSIU, i);
0585         if (ret)
0586             return ret;
0587     }
0588 
0589     return 0;
0590 }
0591 
0592 void rsnd_ssiu_remove(struct rsnd_priv *priv)
0593 {
0594     struct rsnd_ssiu *ssiu;
0595     int i;
0596 
0597     for_each_rsnd_ssiu(ssiu, priv, i) {
0598         rsnd_mod_quit(rsnd_mod_get(ssiu));
0599     }
0600 }
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