diff options
Diffstat (limited to 'drivers/clk/clk-twl6040.c')
| -rw-r--r-- | drivers/clk/clk-twl6040.c | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/drivers/clk/clk-twl6040.c b/drivers/clk/clk-twl6040.c new file mode 100644 index 000000000000..f4a3389c3d09 --- /dev/null +++ b/drivers/clk/clk-twl6040.c @@ -0,0 +1,126 @@ +/* +* TWL6040 clock module driver for OMAP4 McPDM functional clock +* +* Copyright (C) 2012 Texas Instruments Inc. +* Peter Ujfalusi <peter.ujfalusi@ti.com> +* +* This program is free software; you can redistribute it and/or +* modify it under the terms of the GNU General Public License +* version 2 as published by the Free Software Foundation. +* +* This program is distributed in the hope that it will be useful, but +* WITHOUT ANY WARRANTY; without even the implied warranty of +* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +* General Public License for more details. +* +* You should have received a copy of the GNU General Public License +* along with this program; if not, write to the Free Software +* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA +* 02110-1301 USA +* +*/ + +#include <linux/clk.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/platform_device.h> +#include <linux/mfd/twl6040.h> +#include <linux/clk-provider.h> + +struct twl6040_clk { + struct twl6040 *twl6040; + struct device *dev; + struct clk_hw mcpdm_fclk; + struct clk *clk; + int enabled; +}; + +static int twl6040_bitclk_is_enabled(struct clk_hw *hw) +{ + struct twl6040_clk *twl6040_clk = container_of(hw, struct twl6040_clk, + mcpdm_fclk); + return twl6040_clk->enabled; +} + +static int twl6040_bitclk_prepare(struct clk_hw *hw) +{ + struct twl6040_clk *twl6040_clk = container_of(hw, struct twl6040_clk, + mcpdm_fclk); + int ret; + + ret = twl6040_power(twl6040_clk->twl6040, 1); + if (!ret) + twl6040_clk->enabled = 1; + + return ret; +} + +static void twl6040_bitclk_unprepare(struct clk_hw *hw) +{ + struct twl6040_clk *twl6040_clk = container_of(hw, struct twl6040_clk, + mcpdm_fclk); + int ret; + + ret = twl6040_power(twl6040_clk->twl6040, 0); + if (!ret) + twl6040_clk->enabled = 0; +} + +static const struct clk_ops twl6040_mcpdm_ops = { + .is_enabled = twl6040_bitclk_is_enabled, + .prepare = twl6040_bitclk_prepare, + .unprepare = twl6040_bitclk_unprepare, +}; + +static struct clk_init_data wm831x_clkout_init = { + .name = "mcpdm_fclk", + .ops = &twl6040_mcpdm_ops, + .flags = CLK_IS_ROOT, +}; + +static int __devinit twl6040_clk_probe(struct platform_device *pdev) +{ + struct twl6040 *twl6040 = dev_get_drvdata(pdev->dev.parent); + struct twl6040_clk *clkdata; + + clkdata = devm_kzalloc(&pdev->dev, sizeof(*clkdata), GFP_KERNEL); + if (!clkdata) + return -ENOMEM; + + clkdata->dev = &pdev->dev; + clkdata->twl6040 = twl6040; + + clkdata->mcpdm_fclk.init = &wm831x_clkout_init; + clkdata->clk = clk_register(&pdev->dev, &clkdata->mcpdm_fclk); + if (!clkdata->clk) + return -EINVAL; + + dev_set_drvdata(&pdev->dev, clkdata); + + return 0; +} + +static int __devexit twl6040_clk_remove(struct platform_device *pdev) +{ + struct twl6040_clk *clkdata = dev_get_drvdata(&pdev->dev); + + clk_unregister(clkdata->clk); + + return 0; +} + +static struct platform_driver twl6040_clk_driver = { + .driver = { + .name = "twl6040-clk", + .owner = THIS_MODULE, + }, + .probe = twl6040_clk_probe, + .remove = __devexit_p(twl6040_clk_remove), +}; + +module_platform_driver(twl6040_clk_driver); + +MODULE_DESCRIPTION("TWL6040 clock driver for McPDM functional clock"); +MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>"); +MODULE_ALIAS("platform:twl6040-clk"); +MODULE_LICENSE("GPL"); |