| /* |
| * Renesas R-Car SSIU/SSI support |
| * |
| * Copyright (C) 2013 Renesas Solutions Corp. |
| * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> |
| * |
| * Based on fsi.c |
| * Kuninori Morimoto <morimoto.kuninori@renesas.com> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| #include <linux/delay.h> |
| #include "rsnd.h" |
| #define RSND_SSI_NAME_SIZE 16 |
| |
| /* |
| * SSICR |
| */ |
| #define FORCE (1 << 31) /* Fixed */ |
| #define DMEN (1 << 28) /* DMA Enable */ |
| #define UIEN (1 << 27) /* Underflow Interrupt Enable */ |
| #define OIEN (1 << 26) /* Overflow Interrupt Enable */ |
| #define IIEN (1 << 25) /* Idle Mode Interrupt Enable */ |
| #define DIEN (1 << 24) /* Data Interrupt Enable */ |
| |
| #define DWL_8 (0 << 19) /* Data Word Length */ |
| #define DWL_16 (1 << 19) /* Data Word Length */ |
| #define DWL_18 (2 << 19) /* Data Word Length */ |
| #define DWL_20 (3 << 19) /* Data Word Length */ |
| #define DWL_22 (4 << 19) /* Data Word Length */ |
| #define DWL_24 (5 << 19) /* Data Word Length */ |
| #define DWL_32 (6 << 19) /* Data Word Length */ |
| |
| #define SWL_32 (3 << 16) /* R/W System Word Length */ |
| #define SCKD (1 << 15) /* Serial Bit Clock Direction */ |
| #define SWSD (1 << 14) /* Serial WS Direction */ |
| #define SCKP (1 << 13) /* Serial Bit Clock Polarity */ |
| #define SWSP (1 << 12) /* Serial WS Polarity */ |
| #define SDTA (1 << 10) /* Serial Data Alignment */ |
| #define DEL (1 << 8) /* Serial Data Delay */ |
| #define CKDV(v) (v << 4) /* Serial Clock Division Ratio */ |
| #define TRMD (1 << 1) /* Transmit/Receive Mode Select */ |
| #define EN (1 << 0) /* SSI Module Enable */ |
| |
| /* |
| * SSISR |
| */ |
| #define UIRQ (1 << 27) /* Underflow Error Interrupt Status */ |
| #define OIRQ (1 << 26) /* Overflow Error Interrupt Status */ |
| #define IIRQ (1 << 25) /* Idle Mode Interrupt Status */ |
| #define DIRQ (1 << 24) /* Data Interrupt Status Flag */ |
| |
| /* |
| * SSIWSR |
| */ |
| #define CONT (1 << 8) /* WS Continue Function */ |
| |
| struct rsnd_ssi { |
| struct clk *clk; |
| struct rsnd_ssi_platform_info *info; /* rcar_snd.h */ |
| struct rsnd_ssi *parent; |
| struct rsnd_mod mod; |
| |
| struct rsnd_dai *rdai; |
| u32 cr_own; |
| u32 cr_clk; |
| u32 cr_etc; |
| int err; |
| unsigned int usrcnt; |
| unsigned int rate; |
| }; |
| |
| #define for_each_rsnd_ssi(pos, priv, i) \ |
| for (i = 0; \ |
| (i < rsnd_ssi_nr(priv)) && \ |
| ((pos) = ((struct rsnd_ssi *)(priv)->ssi + i)); \ |
| i++) |
| |
| #define rsnd_ssi_nr(priv) ((priv)->ssi_nr) |
| #define rsnd_mod_to_ssi(_mod) container_of((_mod), struct rsnd_ssi, mod) |
| #define rsnd_dma_to_ssi(dma) rsnd_mod_to_ssi(rsnd_dma_to_mod(dma)) |
| #define rsnd_ssi_pio_available(ssi) ((ssi)->info->pio_irq > 0) |
| #define rsnd_ssi_dma_available(ssi) \ |
| rsnd_dma_available(rsnd_mod_to_dma(&(ssi)->mod)) |
| #define rsnd_ssi_clk_from_parent(ssi) ((ssi)->parent) |
| #define rsnd_ssi_mode_flags(p) ((p)->info->flags) |
| #define rsnd_ssi_dai_id(ssi) ((ssi)->info->dai_id) |
| |
| static void rsnd_ssi_status_check(struct rsnd_mod *mod, |
| u32 bit) |
| { |
| struct rsnd_priv *priv = rsnd_mod_to_priv(mod); |
| struct device *dev = rsnd_priv_to_dev(priv); |
| u32 status; |
| int i; |
| |
| for (i = 0; i < 1024; i++) { |
| status = rsnd_mod_read(mod, SSISR); |
| if (status & bit) |
| return; |
| |
| udelay(50); |
| } |
| |
| dev_warn(dev, "status check failed\n"); |
| } |
| |
| static int rsnd_ssi_master_clk_start(struct rsnd_ssi *ssi, |
| struct rsnd_dai_stream *io) |
| { |
| struct rsnd_priv *priv = rsnd_mod_to_priv(&ssi->mod); |
| struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io); |
| struct device *dev = rsnd_priv_to_dev(priv); |
| int i, j, ret; |
| int adg_clk_div_table[] = { |
| 1, 6, /* see adg.c */ |
| }; |
| int ssi_clk_mul_table[] = { |
| 1, 2, 4, 8, 16, 6, 12, |
| }; |
| unsigned int main_rate; |
| unsigned int rate = rsnd_scu_get_ssi_rate(priv, io, runtime); |
| |
| /* |
| * Find best clock, and try to start ADG |
| */ |
| for (i = 0; i < ARRAY_SIZE(adg_clk_div_table); i++) { |
| for (j = 0; j < ARRAY_SIZE(ssi_clk_mul_table); j++) { |
| |
| /* |
| * this driver is assuming that |
| * system word is 64fs (= 2 x 32bit) |
| * see rsnd_ssi_init() |
| */ |
| main_rate = rate / adg_clk_div_table[i] |
| * 32 * 2 * ssi_clk_mul_table[j]; |
| |
| ret = rsnd_adg_ssi_clk_try_start(&ssi->mod, main_rate); |
| if (0 == ret) { |
| ssi->rate = rate; |
| ssi->cr_clk = FORCE | SWL_32 | |
| SCKD | SWSD | CKDV(j); |
| |
| dev_dbg(dev, "ssi%d outputs %u Hz\n", |
| rsnd_mod_id(&ssi->mod), rate); |
| |
| return 0; |
| } |
| } |
| } |
| |
| dev_err(dev, "unsupported clock rate\n"); |
| return -EIO; |
| } |
| |
| static void rsnd_ssi_master_clk_stop(struct rsnd_ssi *ssi) |
| { |
| ssi->rate = 0; |
| ssi->cr_clk = 0; |
| rsnd_adg_ssi_clk_stop(&ssi->mod); |
| } |
| |
| static void rsnd_ssi_hw_start(struct rsnd_ssi *ssi, |
| struct rsnd_dai *rdai, |
| struct rsnd_dai_stream *io) |
| { |
| struct rsnd_priv *priv = rsnd_mod_to_priv(&ssi->mod); |
| struct device *dev = rsnd_priv_to_dev(priv); |
| u32 cr; |
| |
| if (0 == ssi->usrcnt) { |
| clk_enable(ssi->clk); |
| |
| if (rsnd_dai_is_clk_master(rdai)) { |
| if (rsnd_ssi_clk_from_parent(ssi)) |
| rsnd_ssi_hw_start(ssi->parent, rdai, io); |
| else |
| rsnd_ssi_master_clk_start(ssi, io); |
| } |
| } |
| |
| cr = ssi->cr_own | |
| ssi->cr_clk | |
| ssi->cr_etc | |
| EN; |
| |
| rsnd_mod_write(&ssi->mod, SSICR, cr); |
| |
| ssi->usrcnt++; |
| |
| dev_dbg(dev, "ssi%d hw started\n", rsnd_mod_id(&ssi->mod)); |
| } |
| |
| static void rsnd_ssi_hw_stop(struct rsnd_ssi *ssi, |
| struct rsnd_dai *rdai) |
| { |
| struct rsnd_priv *priv = rsnd_mod_to_priv(&ssi->mod); |
| struct device *dev = rsnd_priv_to_dev(priv); |
| u32 cr; |
| |
| if (0 == ssi->usrcnt) /* stop might be called without start */ |
| return; |
| |
| ssi->usrcnt--; |
| |
| if (0 == ssi->usrcnt) { |
| /* |
| * disable all IRQ, |
| * and, wait all data was sent |
| */ |
| cr = ssi->cr_own | |
| ssi->cr_clk; |
| |
| rsnd_mod_write(&ssi->mod, SSICR, cr | EN); |
| rsnd_ssi_status_check(&ssi->mod, DIRQ); |
| |
| /* |
| * disable SSI, |
| * and, wait idle state |
| */ |
| rsnd_mod_write(&ssi->mod, SSICR, cr); /* disabled all */ |
| rsnd_ssi_status_check(&ssi->mod, IIRQ); |
| |
| if (rsnd_dai_is_clk_master(rdai)) { |
| if (rsnd_ssi_clk_from_parent(ssi)) |
| rsnd_ssi_hw_stop(ssi->parent, rdai); |
| else |
| rsnd_ssi_master_clk_stop(ssi); |
| } |
| |
| clk_disable(ssi->clk); |
| } |
| |
| dev_dbg(dev, "ssi%d hw stopped\n", rsnd_mod_id(&ssi->mod)); |
| } |
| |
| /* |
| * SSI mod common functions |
| */ |
| static int rsnd_ssi_init(struct rsnd_mod *mod, |
| struct rsnd_dai *rdai, |
| struct rsnd_dai_stream *io) |
| { |
| struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); |
| struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io); |
| u32 cr; |
| |
| cr = FORCE; |
| |
| /* |
| * always use 32bit system word for easy clock calculation. |
| * see also rsnd_ssi_master_clk_enable() |
| */ |
| cr |= SWL_32; |
| |
| /* |
| * init clock settings for SSICR |
| */ |
| switch (runtime->sample_bits) { |
| case 16: |
| cr |= DWL_16; |
| break; |
| case 32: |
| cr |= DWL_24; |
| break; |
| default: |
| return -EIO; |
| } |
| |
| if (rdai->bit_clk_inv) |
| cr |= SCKP; |
| if (rdai->frm_clk_inv) |
| cr |= SWSP; |
| if (rdai->data_alignment) |
| cr |= SDTA; |
| if (rdai->sys_delay) |
| cr |= DEL; |
| if (rsnd_dai_is_play(rdai, io)) |
| cr |= TRMD; |
| |
| /* |
| * set ssi parameter |
| */ |
| ssi->rdai = rdai; |
| ssi->cr_own = cr; |
| ssi->err = -1; /* ignore 1st error */ |
| |
| rsnd_scu_ssi_mode_init(mod, rdai, io); |
| |
| return 0; |
| } |
| |
| static int rsnd_ssi_quit(struct rsnd_mod *mod, |
| struct rsnd_dai *rdai, |
| struct rsnd_dai_stream *io) |
| { |
| struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); |
| struct rsnd_priv *priv = rsnd_mod_to_priv(mod); |
| struct device *dev = rsnd_priv_to_dev(priv); |
| |
| if (ssi->err > 0) |
| dev_warn(dev, "ssi under/over flow err = %d\n", ssi->err); |
| |
| ssi->rdai = NULL; |
| ssi->cr_own = 0; |
| ssi->err = 0; |
| |
| return 0; |
| } |
| |
| static void rsnd_ssi_record_error(struct rsnd_ssi *ssi, u32 status) |
| { |
| /* under/over flow error */ |
| if (status & (UIRQ | OIRQ)) { |
| ssi->err++; |
| |
| /* clear error status */ |
| rsnd_mod_write(&ssi->mod, SSISR, 0); |
| } |
| } |
| |
| /* |
| * SSI PIO |
| */ |
| static irqreturn_t rsnd_ssi_pio_interrupt(int irq, void *data) |
| { |
| struct rsnd_ssi *ssi = data; |
| struct rsnd_mod *mod = &ssi->mod; |
| struct rsnd_dai_stream *io = rsnd_mod_to_io(mod); |
| u32 status = rsnd_mod_read(mod, SSISR); |
| irqreturn_t ret = IRQ_NONE; |
| |
| if (io && (status & DIRQ)) { |
| struct rsnd_dai *rdai = ssi->rdai; |
| struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io); |
| u32 *buf = (u32 *)(runtime->dma_area + |
| rsnd_dai_pointer_offset(io, 0)); |
| |
| rsnd_ssi_record_error(ssi, status); |
| |
| /* |
| * 8/16/32 data can be assesse to TDR/RDR register |
| * directly as 32bit data |
| * see rsnd_ssi_init() |
| */ |
| if (rsnd_dai_is_play(rdai, io)) |
| rsnd_mod_write(mod, SSITDR, *buf); |
| else |
| *buf = rsnd_mod_read(mod, SSIRDR); |
| |
| rsnd_dai_pointer_update(io, sizeof(*buf)); |
| |
| ret = IRQ_HANDLED; |
| } |
| |
| return ret; |
| } |
| |
| static int rsnd_ssi_pio_start(struct rsnd_mod *mod, |
| struct rsnd_dai *rdai, |
| struct rsnd_dai_stream *io) |
| { |
| struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); |
| |
| /* enable PIO IRQ */ |
| ssi->cr_etc = UIEN | OIEN | DIEN; |
| |
| rsnd_scu_enable_ssi_irq(mod, rdai, io); |
| |
| rsnd_ssi_hw_start(ssi, rdai, io); |
| |
| return 0; |
| } |
| |
| static int rsnd_ssi_pio_stop(struct rsnd_mod *mod, |
| struct rsnd_dai *rdai, |
| struct rsnd_dai_stream *io) |
| { |
| struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); |
| |
| ssi->cr_etc = 0; |
| |
| rsnd_ssi_hw_stop(ssi, rdai); |
| |
| return 0; |
| } |
| |
| static struct rsnd_mod_ops rsnd_ssi_pio_ops = { |
| .name = "ssi (pio)", |
| .init = rsnd_ssi_init, |
| .quit = rsnd_ssi_quit, |
| .start = rsnd_ssi_pio_start, |
| .stop = rsnd_ssi_pio_stop, |
| }; |
| |
| static int rsnd_ssi_dma_start(struct rsnd_mod *mod, |
| struct rsnd_dai *rdai, |
| struct rsnd_dai_stream *io) |
| { |
| struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); |
| struct rsnd_dma *dma = rsnd_mod_to_dma(&ssi->mod); |
| |
| /* enable DMA transfer */ |
| ssi->cr_etc = DMEN; |
| |
| rsnd_dma_start(dma); |
| |
| rsnd_ssi_hw_start(ssi, ssi->rdai, io); |
| |
| /* enable WS continue */ |
| if (rsnd_dai_is_clk_master(rdai)) |
| rsnd_mod_write(&ssi->mod, SSIWSR, CONT); |
| |
| return 0; |
| } |
| |
| static int rsnd_ssi_dma_stop(struct rsnd_mod *mod, |
| struct rsnd_dai *rdai, |
| struct rsnd_dai_stream *io) |
| { |
| struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); |
| struct rsnd_dma *dma = rsnd_mod_to_dma(&ssi->mod); |
| |
| ssi->cr_etc = 0; |
| |
| rsnd_ssi_record_error(ssi, rsnd_mod_read(mod, SSISR)); |
| |
| rsnd_ssi_hw_stop(ssi, rdai); |
| |
| rsnd_dma_stop(dma); |
| |
| return 0; |
| } |
| |
| static struct rsnd_mod_ops rsnd_ssi_dma_ops = { |
| .name = "ssi (dma)", |
| .init = rsnd_ssi_init, |
| .quit = rsnd_ssi_quit, |
| .start = rsnd_ssi_dma_start, |
| .stop = rsnd_ssi_dma_stop, |
| }; |
| |
| /* |
| * Non SSI |
| */ |
| static struct rsnd_mod_ops rsnd_ssi_non_ops = { |
| .name = "ssi (non)", |
| }; |
| |
| /* |
| * ssi mod function |
| */ |
| struct rsnd_mod *rsnd_ssi_mod_get_frm_dai(struct rsnd_priv *priv, |
| int dai_id, int is_play) |
| { |
| struct rsnd_dai_platform_info *dai_info = NULL; |
| struct rsnd_dai_path_info *path_info = NULL; |
| struct rsnd_ssi_platform_info *target_info = NULL; |
| struct rsnd_ssi *ssi; |
| int i, has_play; |
| |
| if (priv->rdai) |
| dai_info = priv->rdai[dai_id].info; |
| if (dai_info) |
| path_info = (is_play) ? &dai_info->playback : &dai_info->capture; |
| if (path_info) |
| target_info = path_info->ssi; |
| |
| is_play = !!is_play; |
| |
| for_each_rsnd_ssi(ssi, priv, i) { |
| if (target_info == ssi->info) |
| return &ssi->mod; |
| |
| /* for compatible */ |
| if (rsnd_ssi_dai_id(ssi) != dai_id) |
| continue; |
| |
| has_play = rsnd_ssi_is_play(&ssi->mod); |
| |
| if (is_play == has_play) |
| return &ssi->mod; |
| } |
| |
| return NULL; |
| } |
| |
| struct rsnd_mod *rsnd_ssi_mod_get(struct rsnd_priv *priv, int id) |
| { |
| if (WARN_ON(id < 0 || id >= rsnd_ssi_nr(priv))) |
| id = 0; |
| |
| return &((struct rsnd_ssi *)(priv->ssi) + id)->mod; |
| } |
| |
| int rsnd_ssi_is_pin_sharing(struct rsnd_mod *mod) |
| { |
| struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); |
| |
| return !!(rsnd_ssi_mode_flags(ssi) & RSND_SSI_CLK_PIN_SHARE); |
| } |
| |
| int rsnd_ssi_is_play(struct rsnd_mod *mod) |
| { |
| struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); |
| |
| return !!(rsnd_ssi_mode_flags(ssi) & RSND_SSI_PLAY); |
| } |
| |
| static void rsnd_ssi_parent_clk_setup(struct rsnd_priv *priv, struct rsnd_ssi *ssi) |
| { |
| if (!rsnd_ssi_is_pin_sharing(&ssi->mod)) |
| return; |
| |
| switch (rsnd_mod_id(&ssi->mod)) { |
| case 1: |
| case 2: |
| ssi->parent = rsnd_mod_to_ssi(rsnd_ssi_mod_get(priv, 0)); |
| break; |
| case 4: |
| ssi->parent = rsnd_mod_to_ssi(rsnd_ssi_mod_get(priv, 3)); |
| break; |
| case 8: |
| ssi->parent = rsnd_mod_to_ssi(rsnd_ssi_mod_get(priv, 7)); |
| break; |
| } |
| } |
| |
| int rsnd_ssi_probe(struct platform_device *pdev, |
| struct rsnd_priv *priv) |
| { |
| struct rcar_snd_info *info = rsnd_priv_to_info(priv); |
| struct rsnd_ssi_platform_info *pinfo; |
| struct device *dev = rsnd_priv_to_dev(priv); |
| struct rsnd_mod_ops *ops; |
| struct clk *clk; |
| struct rsnd_ssi *ssi; |
| char name[RSND_SSI_NAME_SIZE]; |
| int i, nr, ret; |
| |
| /* |
| * init SSI |
| */ |
| nr = info->ssi_info_nr; |
| ssi = devm_kzalloc(dev, sizeof(*ssi) * nr, GFP_KERNEL); |
| if (!ssi) { |
| dev_err(dev, "SSI allocate failed\n"); |
| return -ENOMEM; |
| } |
| |
| priv->ssi = ssi; |
| priv->ssi_nr = nr; |
| |
| for_each_rsnd_ssi(ssi, priv, i) { |
| pinfo = &info->ssi_info[i]; |
| |
| snprintf(name, RSND_SSI_NAME_SIZE, "ssi.%d", i); |
| |
| clk = devm_clk_get(dev, name); |
| if (IS_ERR(clk)) |
| return PTR_ERR(clk); |
| |
| ssi->info = pinfo; |
| ssi->clk = clk; |
| |
| ops = &rsnd_ssi_non_ops; |
| |
| /* |
| * SSI DMA case |
| */ |
| if (pinfo->dma_id > 0) { |
| int is_play; |
| |
| if (info->dai_info) |
| is_play = rsnd_info_is_playback(priv, ssi); |
| else |
| is_play = rsnd_ssi_is_play(&ssi->mod); |
| |
| ret = rsnd_dma_init( |
| priv, rsnd_mod_to_dma(&ssi->mod), |
| is_play, |
| pinfo->dma_id); |
| if (ret < 0) |
| dev_info(dev, "SSI DMA failed. try PIO transter\n"); |
| else |
| ops = &rsnd_ssi_dma_ops; |
| |
| dev_dbg(dev, "SSI%d use DMA transfer\n", i); |
| } |
| |
| /* |
| * SSI PIO case |
| */ |
| if (!rsnd_ssi_dma_available(ssi) && |
| rsnd_ssi_pio_available(ssi)) { |
| ret = devm_request_irq(dev, pinfo->pio_irq, |
| &rsnd_ssi_pio_interrupt, |
| IRQF_SHARED, |
| dev_name(dev), ssi); |
| if (ret) { |
| dev_err(dev, "SSI request interrupt failed\n"); |
| return ret; |
| } |
| |
| ops = &rsnd_ssi_pio_ops; |
| |
| dev_dbg(dev, "SSI%d use PIO transfer\n", i); |
| } |
| |
| rsnd_mod_init(priv, &ssi->mod, ops, RSND_MOD_SSI, i); |
| |
| rsnd_ssi_parent_clk_setup(priv, ssi); |
| } |
| |
| return 0; |
| } |
| |
| void rsnd_ssi_remove(struct platform_device *pdev, |
| struct rsnd_priv *priv) |
| { |
| struct rsnd_ssi *ssi; |
| int i; |
| |
| for_each_rsnd_ssi(ssi, priv, i) { |
| if (rsnd_ssi_dma_available(ssi)) |
| rsnd_dma_quit(priv, rsnd_mod_to_dma(&ssi->mod)); |
| } |
| |
| } |