Commit 21f010b1 authored by Dragan Cvetic's avatar Dragan Cvetic Committed by Greg Kroah-Hartman

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: default avatarDragan Cvetic <dragan.cvetic@xilinx.com>
Signed-off-by: default avatarDerek Kiernan <derek.kiernan@xilinx.com>
Signed-off-by: default avatarDragan Cvetic <dragan.cvetic@xilinx.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 76d83e1c
......@@ -25,12 +25,35 @@
static struct idr dev_idr;
static struct mutex dev_idr_lock;
/**
* struct xsdfec_clks - For managing SD-FEC clocks
* @core_clk: Main processing clock for core
* @axi_clk: AXI4-Lite memory-mapped clock
* @din_words_clk: DIN Words AXI4-Stream Slave clock
* @din_clk: DIN AXI4-Stream Slave clock
* @dout_clk: DOUT Words AXI4-Stream Slave clock
* @dout_words_clk: DOUT AXI4-Stream Slave clock
* @ctrl_clk: Control AXI4-Stream Slave clock
* @status_clk: Status AXI4-Stream Slave clock
*/
struct xsdfec_clks {
struct clk *core_clk;
struct clk *axi_clk;
struct clk *din_words_clk;
struct clk *din_clk;
struct clk *dout_clk;
struct clk *dout_words_clk;
struct clk *ctrl_clk;
struct clk *status_clk;
};
/**
* struct xsdfec_dev - Driver data for SDFEC
* @regs: device physical base address
* @dev: pointer to device struct
* @miscdev: Misc device handle
* @error_data_lock: Error counter and states spinlock
* @clks: Clocks managed by the SDFEC driver
* @dev_name: Device name
* @dev_id: Device ID
*
......@@ -42,6 +65,7 @@ struct xsdfec_dev {
struct miscdevice miscdev;
/* Spinlock to protect state_updated and stats_updated */
spinlock_t error_data_lock;
struct xsdfec_clks clks;
char dev_name[DEV_NAME_LEN];
int dev_id;
};
......@@ -50,6 +74,159 @@ static const struct file_operations xsdfec_fops = {
.owner = THIS_MODULE,
};
static int xsdfec_clk_init(struct platform_device *pdev,
struct xsdfec_clks *clks)
{
int err;
clks->core_clk = devm_clk_get(&pdev->dev, "core_clk");
if (IS_ERR(clks->core_clk)) {
dev_err(&pdev->dev, "failed to get core_clk");
return PTR_ERR(clks->core_clk);
}
clks->axi_clk = devm_clk_get(&pdev->dev, "s_axi_aclk");
if (IS_ERR(clks->axi_clk)) {
dev_err(&pdev->dev, "failed to get axi_clk");
return PTR_ERR(clks->axi_clk);
}
clks->din_words_clk = devm_clk_get(&pdev->dev, "s_axis_din_words_aclk");
if (IS_ERR(clks->din_words_clk)) {
if (PTR_ERR(clks->din_words_clk) != -ENOENT) {
err = PTR_ERR(clks->din_words_clk);
return err;
}
clks->din_words_clk = NULL;
}
clks->din_clk = devm_clk_get(&pdev->dev, "s_axis_din_aclk");
if (IS_ERR(clks->din_clk)) {
if (PTR_ERR(clks->din_clk) != -ENOENT) {
err = PTR_ERR(clks->din_clk);
return err;
}
clks->din_clk = NULL;
}
clks->dout_clk = devm_clk_get(&pdev->dev, "m_axis_dout_aclk");
if (IS_ERR(clks->dout_clk)) {
if (PTR_ERR(clks->dout_clk) != -ENOENT) {
err = PTR_ERR(clks->dout_clk);
return err;
}
clks->dout_clk = NULL;
}
clks->dout_words_clk =
devm_clk_get(&pdev->dev, "s_axis_dout_words_aclk");
if (IS_ERR(clks->dout_words_clk)) {
if (PTR_ERR(clks->dout_words_clk) != -ENOENT) {
err = PTR_ERR(clks->dout_words_clk);
return err;
}
clks->dout_words_clk = NULL;
}
clks->ctrl_clk = devm_clk_get(&pdev->dev, "s_axis_ctrl_aclk");
if (IS_ERR(clks->ctrl_clk)) {
if (PTR_ERR(clks->ctrl_clk) != -ENOENT) {
err = PTR_ERR(clks->ctrl_clk);
return err;
}
clks->ctrl_clk = NULL;
}
clks->status_clk = devm_clk_get(&pdev->dev, "m_axis_status_aclk");
if (IS_ERR(clks->status_clk)) {
if (PTR_ERR(clks->status_clk) != -ENOENT) {
err = PTR_ERR(clks->status_clk);
return err;
}
clks->status_clk = NULL;
}
err = clk_prepare_enable(clks->core_clk);
if (err) {
dev_err(&pdev->dev, "failed to enable core_clk (%d)", err);
return err;
}
err = clk_prepare_enable(clks->axi_clk);
if (err) {
dev_err(&pdev->dev, "failed to enable axi_clk (%d)", err);
goto err_disable_core_clk;
}
err = clk_prepare_enable(clks->din_clk);
if (err) {
dev_err(&pdev->dev, "failed to enable din_clk (%d)", err);
goto err_disable_axi_clk;
}
err = clk_prepare_enable(clks->din_words_clk);
if (err) {
dev_err(&pdev->dev, "failed to enable din_words_clk (%d)", err);
goto err_disable_din_clk;
}
err = clk_prepare_enable(clks->dout_clk);
if (err) {
dev_err(&pdev->dev, "failed to enable dout_clk (%d)", err);
goto err_disable_din_words_clk;
}
err = clk_prepare_enable(clks->dout_words_clk);
if (err) {
dev_err(&pdev->dev, "failed to enable dout_words_clk (%d)",
err);
goto err_disable_dout_clk;
}
err = clk_prepare_enable(clks->ctrl_clk);
if (err) {
dev_err(&pdev->dev, "failed to enable ctrl_clk (%d)", err);
goto err_disable_dout_words_clk;
}
err = clk_prepare_enable(clks->status_clk);
if (err) {
dev_err(&pdev->dev, "failed to enable status_clk (%d)\n", err);
goto err_disable_ctrl_clk;
}
return err;
err_disable_ctrl_clk:
clk_disable_unprepare(clks->ctrl_clk);
err_disable_dout_words_clk:
clk_disable_unprepare(clks->dout_words_clk);
err_disable_dout_clk:
clk_disable_unprepare(clks->dout_clk);
err_disable_din_words_clk:
clk_disable_unprepare(clks->din_words_clk);
err_disable_din_clk:
clk_disable_unprepare(clks->din_clk);
err_disable_axi_clk:
clk_disable_unprepare(clks->axi_clk);
err_disable_core_clk:
clk_disable_unprepare(clks->core_clk);
return err;
}
static void xsdfec_disable_all_clks(struct xsdfec_clks *clks)
{
clk_disable_unprepare(clks->status_clk);
clk_disable_unprepare(clks->ctrl_clk);
clk_disable_unprepare(clks->dout_words_clk);
clk_disable_unprepare(clks->dout_clk);
clk_disable_unprepare(clks->din_words_clk);
clk_disable_unprepare(clks->din_clk);
clk_disable_unprepare(clks->core_clk);
clk_disable_unprepare(clks->axi_clk);
}
static void xsdfec_idr_remove(struct xsdfec_dev *xsdfec)
{
mutex_lock(&dev_idr_lock);
......@@ -71,12 +248,16 @@ static int xsdfec_probe(struct platform_device *pdev)
xsdfec->dev = &pdev->dev;
spin_lock_init(&xsdfec->error_data_lock);
err = xsdfec_clk_init(pdev, &xsdfec->clks);
if (err)
return err;
dev = xsdfec->dev;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
xsdfec->regs = devm_ioremap_resource(dev, res);
if (IS_ERR(xsdfec->regs)) {
err = PTR_ERR(xsdfec->regs);
return err;
goto err_xsdfec_dev;
}
/* Save driver private data */
......@@ -86,7 +267,7 @@ static int xsdfec_probe(struct platform_device *pdev)
err = idr_alloc(&dev_idr, xsdfec->dev_name, 0, 0, GFP_KERNEL);
mutex_unlock(&dev_idr_lock);
if (err < 0)
goto err_xsddev_idr;
goto err_xsdfec_dev;
xsdfec->dev_id = err;
snprintf(xsdfec->dev_name, DEV_NAME_LEN, "xsdfec%d", xsdfec->dev_id);
......@@ -97,13 +278,14 @@ static int xsdfec_probe(struct platform_device *pdev)
err = misc_register(&xsdfec->miscdev);
if (err) {
dev_err(dev, "error:%d. Unable to register device", err);
return err;
goto err_xsdfec_idr;
}
return 0;
err_xsddev_idr:
err_xsdfec_idr:
xsdfec_idr_remove(xsdfec);
err_xsdfec_dev:
xsdfec_disable_all_clks(&xsdfec->clks);
return err;
}
......@@ -114,6 +296,7 @@ static int xsdfec_remove(struct platform_device *pdev)
xsdfec = platform_get_drvdata(pdev);
misc_deregister(&xsdfec->miscdev);
xsdfec_idr_remove(xsdfec);
xsdfec_disable_all_clks(&xsdfec->clks);
return 0;
}
......
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