1 // SPDX-License-Identifier: GPL-2.0+
5  * Taken from dc i2s/rockchip.c
12 #include <i2s.h>
51 	struct rk_i2s_regs *regs = (struct rk_i2s_regs *)priv->base_address;  in rockchip_i2s_init()  local
52 	u32 bps = priv->bitspersample;  in rockchip_i2s_init()
53 	u32 lrf = priv->rfs;  in rockchip_i2s_init()
54 	u32 chn = priv->channels;  in rockchip_i2s_init()
57 	clrbits_le32(&regs->xfer, I2S_TX_TRAN_BIT);  in rockchip_i2s_init()
58 	mode = readl(&regs->txcr) & ~0x1f;  in rockchip_i2s_init()
59 	switch (priv->bitspersample) {  in rockchip_i2s_init()
62 		mode |= (priv->bitspersample - 1) << I2S_DATA_WIDTH_SHIFT;  in rockchip_i2s_init()
65 		log_err("Invalid sample size input %d\n", priv->bitspersample);  in rockchip_i2s_init()
66 		return -EINVAL;  in rockchip_i2s_init()
68 	writel(mode, &regs->txcr);  in rockchip_i2s_init()
70 	mode = readl(&regs->ckr) & ~I2S_MCLK_DIV_MASK;  in rockchip_i2s_init()
71 	mode |= (lrf / (bps * chn) - 1) << I2S_MCLK_DIV_SHIFT;  in rockchip_i2s_init()
74 	mode |= (priv->bitspersample * priv->channels - 1) <<  in rockchip_i2s_init()
76 	writel(mode, &regs->ckr);  in rockchip_i2s_init()
81 static int i2s_send_data(struct rk_i2s_regs *regs, u32 *data, uint length)  in i2s_send_data()  argument
84 		writel(*data++, &regs->txdr);  in i2s_send_data()
86 	length -= min(32u, length);  in i2s_send_data()
89 	setbits_le32(&regs->xfer, I2S_TRAN_MASK);  in i2s_send_data()
91 		if ((readl(&regs->fifolr) & 0x3f) < 0x20) {  in i2s_send_data()
92 			writel(*data++, &regs->txdr);  in i2s_send_data()
93 			length--;  in i2s_send_data()
96 	while (readl(&regs->fifolr) & 0x3f)  in i2s_send_data()
98 	clrbits_le32(&regs->xfer, I2S_TRAN_MASK);  in i2s_send_data()
99 	writel(0, &regs->clr);  in i2s_send_data()
107 	struct rk_i2s_regs *regs = (struct rk_i2s_regs *)priv->base_address;  in rockchip_i2s_tx_data()  local
109 	return i2s_send_data(regs, data, data_size / sizeof(u32));  in rockchip_i2s_tx_data()
119 		log_debug("Missing i2s base\n");  in rockchip_i2s_probe()
120 		return -EINVAL;  in rockchip_i2s_probe()
122 	priv->base_address = base;  in rockchip_i2s_probe()
123 	priv->id = 1;  in rockchip_i2s_probe()
124 	priv->audio_pll_clk = 4800000;  in rockchip_i2s_probe()
125 	priv->samplingrate = 48000;  in rockchip_i2s_probe()
126 	priv->bitspersample = 16;  in rockchip_i2s_probe()
127 	priv->channels = 2;  in rockchip_i2s_probe()
128 	priv->rfs = 256;  in rockchip_i2s_probe()
129 	priv->bfs = 32;  in rockchip_i2s_probe()
139 	{ .compatible = "rockchip,rk3288-i2s" },