diff options
| author | Sandeep Singh <sandeep@freescale.com> | 2014-05-15 21:44:40 (GMT) |
|---|---|---|
| committer | Jose Rivera <German.Rivera@freescale.com> | 2014-05-22 13:22:21 (GMT) |
| commit | d44c84a4a95ec3c1aaeb5989205d373619463220 (patch) | |
| tree | 272669c3df69f9409deb905ccd203fefe1126db5 /drivers/tdm | |
| parent | 7c53aa7b23b5dc3128e320dc226fb71e0527670c (diff) | |
| download | linux-fsl-qoriq-d44c84a4a95ec3c1aaeb5989205d373619463220.tar.xz | |
tdm/device: Add configuration to enable use of internal clock
TDM can either use an external (on-board) oscillator or use
platform clock as source. On the boards which do not have an
external clock enable TDM to use internal clock.
Signed-off-by: Sandeep Singh <sandeep@freescale.com>
Change-Id: Ic07aa8c419bb2fa4f61db17195638acf4914df0a
Reviewed-on: http://git.am.freescale.net:8181/12415
Tested-by: Review Code-CDREVIEW <CDREVIEW@freescale.com>
Reviewed-by: Poonam Aggrwal <poonam.aggrwal@freescale.com>
Reviewed-by: Jose Rivera <German.Rivera@freescale.com>
Diffstat (limited to 'drivers/tdm')
| -rw-r--r-- | drivers/tdm/device/tdm_fsl.c | 47 |
1 files changed, 39 insertions, 8 deletions
diff --git a/drivers/tdm/device/tdm_fsl.c b/drivers/tdm/device/tdm_fsl.c index 8a8465b..fe8ad8d 100644 --- a/drivers/tdm/device/tdm_fsl.c +++ b/drivers/tdm/device/tdm_fsl.c @@ -50,6 +50,11 @@ #define DRV_DESC "Freescale TDM Driver Adapter" #define DRV_NAME "fsl_tdm" +/* TDM needs clock input of ~2.048Mhz. Input clock for TDM for T1040 is + * CCB/2. TODO: make TDM_CLK_DIV_VAL calculation dynamic based on clock input + * This can be done using dts.*/ +#define TDM_CLK_DIV_VAL 0x85 + int loopback; module_param(loopback, int, 0); MODULE_PARM_DESC(loopback, "Enable TDM in loopback mode." @@ -60,6 +65,8 @@ static int tdmen = 1; module_param(tdmen, int, S_IRUSR); MODULE_PARM_DESC(tdmen, "Enable TDM: Enable=1, Disable=0(default)"); +static int tdm_internal_clk = 1; + /* Initialize the Tx Transmit Control Discriptor parameters*/ static void tx_tcd_init(struct tdm_priv *priv) { @@ -432,19 +439,33 @@ static int tdm_fsl_reg_init(struct tdm_priv *priv) else out_be32(&priv->tdm_regs->gir, GIR_RTS); + if (tdm_internal_clk) { + out_be32(&priv->tdm_regs->rir, + RIR_RFWM(RIR_RFWM_VAL) | RIR_RFEN | RIR_RWEN | RIR_RDMA | + RIR_RSO | RIR_RCOE | RIR_RRDO | RIR_RFSD(RIR_RFSD_VAL)); + out_be32(&priv->tdm_regs->tir, + TIR_TFWM(TIR_RFWM_VAL) | TIR_TFEN | TIR_TWEN | TIR_TDMA | + TIR_TCOE | TIR_TSL | TIR_TSO | TIR_TRDO | + TIR_TFSD(TIR_RFSD_VAL)); + + out_be32(&priv->clk_regs->tx, TDM_CLK_DIV_VAL); + out_be32(&priv->clk_regs->rx, TDM_CLK_DIV_VAL); + pr_info("TDM configured to use internal clock"); + } else { /* Rx Water mark 0, FIFO enable, Wide fifo, DMA enable for RX, Receive Sync out, syncwidth = ch width, Rx clk out,zero sync, falling edge , data order */ - - out_be32(&priv->tdm_regs->rir, - RIR_RFWM(RIR_RFWM_VAL) | RIR_RFEN | RIR_RWEN | RIR_RDMA | - RIR_RSL | RIR_RSO | RIR_RCOE | RIR_RRDO | - RIR_RFSD(RIR_RFSD_VAL)); - out_be32(&priv->tdm_regs->tir, - TIR_TFWM(TIR_RFWM_VAL) | TIR_TFEN | TIR_TWEN | TIR_TDMA | - TIR_TSL | TIR_TSO | TIR_TRDO | TIR_TFSD(TIR_RFSD_VAL)); + out_be32(&priv->tdm_regs->rir, + RIR_RFWM(RIR_RFWM_VAL) | RIR_RFEN | RIR_RWEN | RIR_RDMA | + RIR_RSL | RIR_RSO | RIR_RCOE | RIR_RRDO | + RIR_RFSD(RIR_RFSD_VAL)); + out_be32(&priv->tdm_regs->tir, + TIR_TFWM(TIR_RFWM_VAL) | TIR_TFEN | TIR_TWEN | TIR_TDMA | + TIR_TSL | TIR_TSO | TIR_TRDO | TIR_TFSD(TIR_RFSD_VAL)); + pr_info("TDM configured to use external clock"); + } /* no of channels ,Channel size-coading */ switch (adap->adapt_cfg.ch_size_type) { @@ -898,6 +919,16 @@ static struct platform_driver tdm_fsl_driver = { static int __init tdm_fsl_init(void) { int ret; + struct device_node *dev_node; + + /* Few boards do not have external clock source for TDM. Check board + * type using dts, select internal clock source only for those boards + * which do not have external clock. + */ + dev_node = of_find_compatible_node(NULL, NULL, "fsl,T1040RDB"); + if (!dev_node) + tdm_internal_clk = 0; + pr_info(DRV_NAME ": " DRV_DESC ":Init\n"); ret = platform_driver_register(&tdm_fsl_driver); if (ret) |