3621dbbc27
Unbalanced calls to imx_ssi_trigger() may result in endless SSI activity and thus provoke eternal sound. While on the first glance, the switch statement looks pretty symmetric, the SUSPEND/RESUME pair is not: the suspend case comes along snd_pcm_suspend_all(), which for fsl/imx-pcm-fiq is called only at snd_soc_suspend(), but the resume case originates straight from the SNDRV_PCM_IOCTL_RESUME. This way userland may provoke an unbalanced resume, which might cause the ssi->enabled counter to increase and never return to zero again, so eventually SSI_SCR_SSIEN is never disabled. As the information on whether to enable the SSI or not is contained in the two bits for TE/RE, we save all the software mirroring of hardware state here and simply use the hardware register itself to keep the state of whether someone is currently playing or capturing. This is essentially the same stuff as in sound/soc/fsl/imx-pcm-fiq.c which I send a patch for three days ago. Astonishing enough this highly fragile scheme is used twice in parallel to serve the very same control function, synchronously: Once out of sync you are lost until reboot. Note, that these fixes wont prevent state machine distortion on alsa level to cut sound or the like. It just makes sure we have a chance to synchronise again later on. Signed-off-by: Oskar Schirmer <oskar@scara.com> Signed-off-by: Mark Brown <broonie@linaro.org>
219 lines
6.2 KiB
C
219 lines
6.2 KiB
C
/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef _IMX_SSI_H
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#define _IMX_SSI_H
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#define SSI_STX0 0x00
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#define SSI_STX1 0x04
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#define SSI_SRX0 0x08
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#define SSI_SRX1 0x0c
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#define SSI_SCR 0x10
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#define SSI_SCR_CLK_IST (1 << 9)
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#define SSI_SCR_CLK_IST_SHIFT 9
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#define SSI_SCR_TCH_EN (1 << 8)
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#define SSI_SCR_SYS_CLK_EN (1 << 7)
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#define SSI_SCR_I2S_MODE_NORM (0 << 5)
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#define SSI_SCR_I2S_MODE_MSTR (1 << 5)
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#define SSI_SCR_I2S_MODE_SLAVE (2 << 5)
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#define SSI_I2S_MODE_MASK (3 << 5)
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#define SSI_SCR_SYN (1 << 4)
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#define SSI_SCR_NET (1 << 3)
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#define SSI_SCR_RE (1 << 2)
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#define SSI_SCR_TE (1 << 1)
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#define SSI_SCR_SSIEN (1 << 0)
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#define SSI_SISR 0x14
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#define SSI_SISR_MASK ((1 << 19) - 1)
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#define SSI_SISR_CMDAU (1 << 18)
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#define SSI_SISR_CMDDU (1 << 17)
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#define SSI_SISR_RXT (1 << 16)
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#define SSI_SISR_RDR1 (1 << 15)
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#define SSI_SISR_RDR0 (1 << 14)
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#define SSI_SISR_TDE1 (1 << 13)
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#define SSI_SISR_TDE0 (1 << 12)
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#define SSI_SISR_ROE1 (1 << 11)
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#define SSI_SISR_ROE0 (1 << 10)
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#define SSI_SISR_TUE1 (1 << 9)
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#define SSI_SISR_TUE0 (1 << 8)
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#define SSI_SISR_TFS (1 << 7)
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#define SSI_SISR_RFS (1 << 6)
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#define SSI_SISR_TLS (1 << 5)
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#define SSI_SISR_RLS (1 << 4)
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#define SSI_SISR_RFF1 (1 << 3)
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#define SSI_SISR_RFF0 (1 << 2)
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#define SSI_SISR_TFE1 (1 << 1)
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#define SSI_SISR_TFE0 (1 << 0)
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#define SSI_SIER 0x18
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#define SSI_SIER_RDMAE (1 << 22)
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#define SSI_SIER_RIE (1 << 21)
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#define SSI_SIER_TDMAE (1 << 20)
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#define SSI_SIER_TIE (1 << 19)
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#define SSI_SIER_CMDAU_EN (1 << 18)
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#define SSI_SIER_CMDDU_EN (1 << 17)
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#define SSI_SIER_RXT_EN (1 << 16)
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#define SSI_SIER_RDR1_EN (1 << 15)
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#define SSI_SIER_RDR0_EN (1 << 14)
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#define SSI_SIER_TDE1_EN (1 << 13)
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#define SSI_SIER_TDE0_EN (1 << 12)
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#define SSI_SIER_ROE1_EN (1 << 11)
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#define SSI_SIER_ROE0_EN (1 << 10)
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#define SSI_SIER_TUE1_EN (1 << 9)
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#define SSI_SIER_TUE0_EN (1 << 8)
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#define SSI_SIER_TFS_EN (1 << 7)
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#define SSI_SIER_RFS_EN (1 << 6)
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#define SSI_SIER_TLS_EN (1 << 5)
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#define SSI_SIER_RLS_EN (1 << 4)
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#define SSI_SIER_RFF1_EN (1 << 3)
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#define SSI_SIER_RFF0_EN (1 << 2)
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#define SSI_SIER_TFE1_EN (1 << 1)
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#define SSI_SIER_TFE0_EN (1 << 0)
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#define SSI_STCR 0x1c
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#define SSI_STCR_TXBIT0 (1 << 9)
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#define SSI_STCR_TFEN1 (1 << 8)
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#define SSI_STCR_TFEN0 (1 << 7)
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#define SSI_FIFO_ENABLE_0_SHIFT 7
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#define SSI_STCR_TFDIR (1 << 6)
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#define SSI_STCR_TXDIR (1 << 5)
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#define SSI_STCR_TSHFD (1 << 4)
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#define SSI_STCR_TSCKP (1 << 3)
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#define SSI_STCR_TFSI (1 << 2)
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#define SSI_STCR_TFSL (1 << 1)
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#define SSI_STCR_TEFS (1 << 0)
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#define SSI_SRCR 0x20
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#define SSI_SRCR_RXBIT0 (1 << 9)
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#define SSI_SRCR_RFEN1 (1 << 8)
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#define SSI_SRCR_RFEN0 (1 << 7)
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#define SSI_FIFO_ENABLE_0_SHIFT 7
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#define SSI_SRCR_RFDIR (1 << 6)
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#define SSI_SRCR_RXDIR (1 << 5)
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#define SSI_SRCR_RSHFD (1 << 4)
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#define SSI_SRCR_RSCKP (1 << 3)
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#define SSI_SRCR_RFSI (1 << 2)
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#define SSI_SRCR_RFSL (1 << 1)
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#define SSI_SRCR_REFS (1 << 0)
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#define SSI_SRCCR 0x28
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#define SSI_SRCCR_DIV2 (1 << 18)
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#define SSI_SRCCR_PSR (1 << 17)
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#define SSI_SRCCR_WL(x) ((((x) - 2) >> 1) << 13)
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#define SSI_SRCCR_DC(x) (((x) & 0x1f) << 8)
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#define SSI_SRCCR_PM(x) (((x) & 0xff) << 0)
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#define SSI_SRCCR_WL_MASK (0xf << 13)
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#define SSI_SRCCR_DC_MASK (0x1f << 8)
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#define SSI_SRCCR_PM_MASK (0xff << 0)
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#define SSI_STCCR 0x24
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#define SSI_STCCR_DIV2 (1 << 18)
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#define SSI_STCCR_PSR (1 << 17)
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#define SSI_STCCR_WL(x) ((((x) - 2) >> 1) << 13)
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#define SSI_STCCR_DC(x) (((x) & 0x1f) << 8)
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#define SSI_STCCR_PM(x) (((x) & 0xff) << 0)
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#define SSI_STCCR_WL_MASK (0xf << 13)
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#define SSI_STCCR_DC_MASK (0x1f << 8)
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#define SSI_STCCR_PM_MASK (0xff << 0)
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#define SSI_SFCSR 0x2c
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#define SSI_SFCSR_RFCNT1(x) (((x) & 0xf) << 28)
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#define SSI_RX_FIFO_1_COUNT_SHIFT 28
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#define SSI_SFCSR_TFCNT1(x) (((x) & 0xf) << 24)
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#define SSI_TX_FIFO_1_COUNT_SHIFT 24
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#define SSI_SFCSR_RFWM1(x) (((x) & 0xf) << 20)
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#define SSI_SFCSR_TFWM1(x) (((x) & 0xf) << 16)
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#define SSI_SFCSR_RFCNT0(x) (((x) & 0xf) << 12)
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#define SSI_RX_FIFO_0_COUNT_SHIFT 12
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#define SSI_SFCSR_TFCNT0(x) (((x) & 0xf) << 8)
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#define SSI_TX_FIFO_0_COUNT_SHIFT 8
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#define SSI_SFCSR_RFWM0(x) (((x) & 0xf) << 4)
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#define SSI_SFCSR_TFWM0(x) (((x) & 0xf) << 0)
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#define SSI_SFCSR_RFWM0_MASK (0xf << 4)
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#define SSI_SFCSR_TFWM0_MASK (0xf << 0)
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#define SSI_STR 0x30
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#define SSI_STR_TEST (1 << 15)
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#define SSI_STR_RCK2TCK (1 << 14)
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#define SSI_STR_RFS2TFS (1 << 13)
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#define SSI_STR_RXSTATE(x) (((x) & 0xf) << 8)
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#define SSI_STR_TXD2RXD (1 << 7)
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#define SSI_STR_TCK2RCK (1 << 6)
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#define SSI_STR_TFS2RFS (1 << 5)
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#define SSI_STR_TXSTATE(x) (((x) & 0xf) << 0)
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#define SSI_SOR 0x34
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#define SSI_SOR_CLKOFF (1 << 6)
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#define SSI_SOR_RX_CLR (1 << 5)
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#define SSI_SOR_TX_CLR (1 << 4)
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#define SSI_SOR_INIT (1 << 3)
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#define SSI_SOR_WAIT(x) (((x) & 0x3) << 1)
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#define SSI_SOR_WAIT_MASK (0x3 << 1)
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#define SSI_SOR_SYNRST (1 << 0)
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#define SSI_SACNT 0x38
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#define SSI_SACNT_FRDIV(x) (((x) & 0x3f) << 5)
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#define SSI_SACNT_WR (1 << 4)
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#define SSI_SACNT_RD (1 << 3)
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#define SSI_SACNT_TIF (1 << 2)
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#define SSI_SACNT_FV (1 << 1)
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#define SSI_SACNT_AC97EN (1 << 0)
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#define SSI_SACADD 0x3c
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#define SSI_SACDAT 0x40
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#define SSI_SATAG 0x44
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#define SSI_STMSK 0x48
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#define SSI_SRMSK 0x4c
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#define SSI_SACCST 0x50
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#define SSI_SACCEN 0x54
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#define SSI_SACCDIS 0x58
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/* SSI clock sources */
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#define IMX_SSP_SYS_CLK 0
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/* SSI audio dividers */
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#define IMX_SSI_TX_DIV_2 0
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#define IMX_SSI_TX_DIV_PSR 1
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#define IMX_SSI_TX_DIV_PM 2
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#define IMX_SSI_RX_DIV_2 3
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#define IMX_SSI_RX_DIV_PSR 4
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#define IMX_SSI_RX_DIV_PM 5
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#define DRV_NAME "imx-ssi"
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#include <linux/dmaengine.h>
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#include <linux/platform_data/dma-imx.h>
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#include <sound/dmaengine_pcm.h>
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#include "imx-pcm.h"
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struct imx_ssi {
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struct platform_device *ac97_dev;
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struct snd_soc_dai *imx_ac97;
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struct clk *clk;
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void __iomem *base;
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int irq;
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int fiq_enable;
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unsigned int offset;
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unsigned int flags;
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void (*ac97_reset) (struct snd_ac97 *ac97);
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void (*ac97_warm_reset)(struct snd_ac97 *ac97);
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struct snd_dmaengine_dai_dma_data dma_params_rx;
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struct snd_dmaengine_dai_dma_data dma_params_tx;
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struct imx_dma_data filter_data_tx;
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struct imx_dma_data filter_data_rx;
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struct imx_pcm_fiq_params fiq_params;
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int fiq_init;
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int dma_init;
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};
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#endif /* _IMX_SSI_H */
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