misc: xilinx_sdfec: Add CCF support
Add the support for Linux Clock Control Framework (CCF). Registers and enables clocks with the Clock Control Framework (CCF), to prevent shared clocks from been disabled. Tested-by: Dragan Cvetic <dragan.cvetic@xilinx.com> Signed-off-by: Derek Kiernan <derek.kiernan@xilinx.com> Signed-off-by: Dragan Cvetic <dragan.cvetic@xilinx.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dragan Cvetic
Greg Kroah-Hartman
parent
76d83e1c32
commit
21f010b110
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@ -25,12 +25,35 @@
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static struct idr dev_idr;
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static struct mutex dev_idr_lock;
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/**
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* struct xsdfec_clks - For managing SD-FEC clocks
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* @core_clk: Main processing clock for core
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* @axi_clk: AXI4-Lite memory-mapped clock
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* @din_words_clk: DIN Words AXI4-Stream Slave clock
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* @din_clk: DIN AXI4-Stream Slave clock
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* @dout_clk: DOUT Words AXI4-Stream Slave clock
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* @dout_words_clk: DOUT AXI4-Stream Slave clock
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* @ctrl_clk: Control AXI4-Stream Slave clock
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* @status_clk: Status AXI4-Stream Slave clock
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*/
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struct xsdfec_clks {
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struct clk *core_clk;
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struct clk *axi_clk;
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struct clk *din_words_clk;
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struct clk *din_clk;
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struct clk *dout_clk;
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struct clk *dout_words_clk;
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struct clk *ctrl_clk;
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struct clk *status_clk;
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};
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/**
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* struct xsdfec_dev - Driver data for SDFEC
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* @regs: device physical base address
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* @dev: pointer to device struct
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* @miscdev: Misc device handle
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* @error_data_lock: Error counter and states spinlock
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* @clks: Clocks managed by the SDFEC driver
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* @dev_name: Device name
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* @dev_id: Device ID
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*
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@ -42,6 +65,7 @@ struct xsdfec_dev {
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struct miscdevice miscdev;
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/* Spinlock to protect state_updated and stats_updated */
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spinlock_t error_data_lock;
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struct xsdfec_clks clks;
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char dev_name[DEV_NAME_LEN];
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int dev_id;
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};
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@ -50,6 +74,159 @@ static const struct file_operations xsdfec_fops = {
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.owner = THIS_MODULE,
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};
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static int xsdfec_clk_init(struct platform_device *pdev,
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struct xsdfec_clks *clks)
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{
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int err;
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clks->core_clk = devm_clk_get(&pdev->dev, "core_clk");
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if (IS_ERR(clks->core_clk)) {
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dev_err(&pdev->dev, "failed to get core_clk");
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return PTR_ERR(clks->core_clk);
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}
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clks->axi_clk = devm_clk_get(&pdev->dev, "s_axi_aclk");
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if (IS_ERR(clks->axi_clk)) {
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dev_err(&pdev->dev, "failed to get axi_clk");
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return PTR_ERR(clks->axi_clk);
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}
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clks->din_words_clk = devm_clk_get(&pdev->dev, "s_axis_din_words_aclk");
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if (IS_ERR(clks->din_words_clk)) {
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if (PTR_ERR(clks->din_words_clk) != -ENOENT) {
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err = PTR_ERR(clks->din_words_clk);
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return err;
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}
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clks->din_words_clk = NULL;
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}
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clks->din_clk = devm_clk_get(&pdev->dev, "s_axis_din_aclk");
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if (IS_ERR(clks->din_clk)) {
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if (PTR_ERR(clks->din_clk) != -ENOENT) {
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err = PTR_ERR(clks->din_clk);
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return err;
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}
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clks->din_clk = NULL;
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}
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clks->dout_clk = devm_clk_get(&pdev->dev, "m_axis_dout_aclk");
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if (IS_ERR(clks->dout_clk)) {
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if (PTR_ERR(clks->dout_clk) != -ENOENT) {
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err = PTR_ERR(clks->dout_clk);
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return err;
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}
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clks->dout_clk = NULL;
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}
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clks->dout_words_clk =
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devm_clk_get(&pdev->dev, "s_axis_dout_words_aclk");
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if (IS_ERR(clks->dout_words_clk)) {
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if (PTR_ERR(clks->dout_words_clk) != -ENOENT) {
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err = PTR_ERR(clks->dout_words_clk);
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return err;
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}
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clks->dout_words_clk = NULL;
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}
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clks->ctrl_clk = devm_clk_get(&pdev->dev, "s_axis_ctrl_aclk");
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if (IS_ERR(clks->ctrl_clk)) {
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if (PTR_ERR(clks->ctrl_clk) != -ENOENT) {
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err = PTR_ERR(clks->ctrl_clk);
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return err;
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}
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clks->ctrl_clk = NULL;
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}
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clks->status_clk = devm_clk_get(&pdev->dev, "m_axis_status_aclk");
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if (IS_ERR(clks->status_clk)) {
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if (PTR_ERR(clks->status_clk) != -ENOENT) {
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err = PTR_ERR(clks->status_clk);
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return err;
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}
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clks->status_clk = NULL;
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}
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err = clk_prepare_enable(clks->core_clk);
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if (err) {
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dev_err(&pdev->dev, "failed to enable core_clk (%d)", err);
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return err;
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}
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err = clk_prepare_enable(clks->axi_clk);
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if (err) {
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dev_err(&pdev->dev, "failed to enable axi_clk (%d)", err);
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goto err_disable_core_clk;
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}
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err = clk_prepare_enable(clks->din_clk);
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if (err) {
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dev_err(&pdev->dev, "failed to enable din_clk (%d)", err);
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goto err_disable_axi_clk;
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}
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err = clk_prepare_enable(clks->din_words_clk);
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if (err) {
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dev_err(&pdev->dev, "failed to enable din_words_clk (%d)", err);
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goto err_disable_din_clk;
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}
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err = clk_prepare_enable(clks->dout_clk);
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if (err) {
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dev_err(&pdev->dev, "failed to enable dout_clk (%d)", err);
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goto err_disable_din_words_clk;
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}
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err = clk_prepare_enable(clks->dout_words_clk);
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if (err) {
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dev_err(&pdev->dev, "failed to enable dout_words_clk (%d)",
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err);
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goto err_disable_dout_clk;
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}
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err = clk_prepare_enable(clks->ctrl_clk);
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if (err) {
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dev_err(&pdev->dev, "failed to enable ctrl_clk (%d)", err);
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goto err_disable_dout_words_clk;
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}
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err = clk_prepare_enable(clks->status_clk);
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if (err) {
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dev_err(&pdev->dev, "failed to enable status_clk (%d)\n", err);
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goto err_disable_ctrl_clk;
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}
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return err;
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err_disable_ctrl_clk:
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clk_disable_unprepare(clks->ctrl_clk);
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err_disable_dout_words_clk:
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clk_disable_unprepare(clks->dout_words_clk);
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err_disable_dout_clk:
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clk_disable_unprepare(clks->dout_clk);
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err_disable_din_words_clk:
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clk_disable_unprepare(clks->din_words_clk);
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err_disable_din_clk:
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clk_disable_unprepare(clks->din_clk);
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err_disable_axi_clk:
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clk_disable_unprepare(clks->axi_clk);
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err_disable_core_clk:
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clk_disable_unprepare(clks->core_clk);
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return err;
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}
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static void xsdfec_disable_all_clks(struct xsdfec_clks *clks)
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{
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clk_disable_unprepare(clks->status_clk);
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clk_disable_unprepare(clks->ctrl_clk);
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clk_disable_unprepare(clks->dout_words_clk);
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clk_disable_unprepare(clks->dout_clk);
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clk_disable_unprepare(clks->din_words_clk);
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clk_disable_unprepare(clks->din_clk);
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clk_disable_unprepare(clks->core_clk);
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clk_disable_unprepare(clks->axi_clk);
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}
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static void xsdfec_idr_remove(struct xsdfec_dev *xsdfec)
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{
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mutex_lock(&dev_idr_lock);
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@ -71,12 +248,16 @@ static int xsdfec_probe(struct platform_device *pdev)
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xsdfec->dev = &pdev->dev;
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spin_lock_init(&xsdfec->error_data_lock);
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err = xsdfec_clk_init(pdev, &xsdfec->clks);
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if (err)
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return err;
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dev = xsdfec->dev;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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xsdfec->regs = devm_ioremap_resource(dev, res);
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if (IS_ERR(xsdfec->regs)) {
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err = PTR_ERR(xsdfec->regs);
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return err;
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goto err_xsdfec_dev;
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}
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/* Save driver private data */
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@ -86,7 +267,7 @@ static int xsdfec_probe(struct platform_device *pdev)
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err = idr_alloc(&dev_idr, xsdfec->dev_name, 0, 0, GFP_KERNEL);
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mutex_unlock(&dev_idr_lock);
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if (err < 0)
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goto err_xsddev_idr;
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goto err_xsdfec_dev;
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xsdfec->dev_id = err;
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snprintf(xsdfec->dev_name, DEV_NAME_LEN, "xsdfec%d", xsdfec->dev_id);
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@ -97,13 +278,14 @@ static int xsdfec_probe(struct platform_device *pdev)
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err = misc_register(&xsdfec->miscdev);
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if (err) {
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dev_err(dev, "error:%d. Unable to register device", err);
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return err;
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goto err_xsdfec_idr;
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}
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return 0;
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err_xsddev_idr:
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err_xsdfec_idr:
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xsdfec_idr_remove(xsdfec);
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err_xsdfec_dev:
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xsdfec_disable_all_clks(&xsdfec->clks);
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return err;
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}
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@ -114,6 +296,7 @@ static int xsdfec_remove(struct platform_device *pdev)
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xsdfec = platform_get_drvdata(pdev);
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misc_deregister(&xsdfec->miscdev);
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xsdfec_idr_remove(xsdfec);
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xsdfec_disable_all_clks(&xsdfec->clks);
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return 0;
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}
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