diff options
Diffstat (limited to 'drivers/video/fbdev/omap2/dss/video-pll.c')
| -rw-r--r-- | drivers/video/fbdev/omap2/dss/video-pll.c | 211 |
1 files changed, 211 insertions, 0 deletions
diff --git a/drivers/video/fbdev/omap2/dss/video-pll.c b/drivers/video/fbdev/omap2/dss/video-pll.c new file mode 100644 index 000000000000..b1ec59e42940 --- /dev/null +++ b/drivers/video/fbdev/omap2/dss/video-pll.c @@ -0,0 +1,211 @@ +/* +* Copyright (C) 2014 Texas Instruments Ltd +* +* 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. +* +* You should have received a copy of the GNU General Public License along with +* this program. If not, see <http://www.gnu.org/licenses/>. +*/ + +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/err.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/platform_device.h> +#include <linux/sched.h> + +#include <video/omapdss.h> + +#include "dss.h" +#include "dss_features.h" + +struct dss_video_pll { + struct dss_pll pll; + + struct device *dev; + + void __iomem *clkctrl_base; +}; + +#define REG_MOD(reg, val, start, end) \ + writel_relaxed(FLD_MOD(readl_relaxed(reg), val, start, end), reg) + +static void dss_dpll_enable_scp_clk(struct dss_video_pll *vpll) +{ + REG_MOD(vpll->clkctrl_base, 1, 14, 14); /* CIO_CLK_ICG */ +} + +static void dss_dpll_disable_scp_clk(struct dss_video_pll *vpll) +{ + REG_MOD(vpll->clkctrl_base, 0, 14, 14); /* CIO_CLK_ICG */ +} + +static void dss_dpll_power_enable(struct dss_video_pll *vpll) +{ + REG_MOD(vpll->clkctrl_base, 2, 31, 30); /* PLL_POWER_ON_ALL */ + + /* + * DRA7x PLL CTRL's PLL_PWR_STATUS seems to always return 0, + * so we have to use fixed delay here. + */ + msleep(1); +} + +static void dss_dpll_power_disable(struct dss_video_pll *vpll) +{ + REG_MOD(vpll->clkctrl_base, 0, 31, 30); /* PLL_POWER_OFF */ +} + +static int dss_video_pll_enable(struct dss_pll *pll) +{ + struct dss_video_pll *vpll = container_of(pll, struct dss_video_pll, pll); + int r; + + r = dss_runtime_get(); + if (r) + return r; + + dss_ctrl_pll_enable(pll->id, true); + + dss_dpll_enable_scp_clk(vpll); + + r = dss_pll_wait_reset_done(pll); + if (r) + goto err_reset; + + dss_dpll_power_enable(vpll); + + return 0; + +err_reset: + dss_dpll_disable_scp_clk(vpll); + dss_ctrl_pll_enable(pll->id, false); + dss_runtime_put(); + + return r; +} + +static void dss_video_pll_disable(struct dss_pll *pll) +{ + struct dss_video_pll *vpll = container_of(pll, struct dss_video_pll, pll); + + dss_dpll_power_disable(vpll); + + dss_dpll_disable_scp_clk(vpll); + + dss_ctrl_pll_enable(pll->id, false); + + dss_runtime_put(); +} + +static const struct dss_pll_ops dss_pll_ops = { + .enable = dss_video_pll_enable, + .disable = dss_video_pll_disable, + .set_config = dss_pll_write_config_type_a, +}; + +static const struct dss_pll_hw dss_dra7_video_pll_hw = { + .n_max = (1 << 8) - 1, + .m_max = (1 << 12) - 1, + .mX_max = (1 << 5) - 1, + .fint_min = 500000, + .fint_max = 2500000, + .clkdco_max = 1800000000, + + .n_msb = 8, + .n_lsb = 1, + .m_msb = 20, + .m_lsb = 9, + + .mX_msb[0] = 25, + .mX_lsb[0] = 21, + .mX_msb[1] = 30, + .mX_lsb[1] = 26, + + .has_refsel = true, +}; + +struct dss_pll *dss_video_pll_init(struct platform_device *pdev, int id, + struct regulator *regulator) +{ + const char * const reg_name[] = { "pll1", "pll2" }; + const char * const clkctrl_name[] = { "pll1_clkctrl", "pll2_clkctrl" }; + const char * const clkin_name[] = { "video1_clk", "video2_clk" }; + + struct resource *res; + struct dss_video_pll *vpll; + void __iomem *pll_base, *clkctrl_base; + struct clk *clk; + struct dss_pll *pll; + int r; + + /* PLL CONTROL */ + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, reg_name[id]); + if (!res) { + dev_err(&pdev->dev, + "missing platform resource data for pll%d\n", id); + return ERR_PTR(-ENODEV); + } + + pll_base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(pll_base)) { + dev_err(&pdev->dev, "failed to ioremap pll%d reg_name\n", id); + return ERR_CAST(pll_base); + } + + /* CLOCK CONTROL */ + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, + clkctrl_name[id]); + if (!res) { + dev_err(&pdev->dev, + "missing platform resource data for pll%d\n", id); + return ERR_PTR(-ENODEV); + } + + clkctrl_base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(clkctrl_base)) { + dev_err(&pdev->dev, "failed to ioremap pll%d clkctrl\n", id); + return ERR_CAST(clkctrl_base); + } + + /* CLKIN */ + + clk = devm_clk_get(&pdev->dev, clkin_name[id]); + if (IS_ERR(clk)) { + DSSERR("can't get video pll clkin\n"); + return ERR_CAST(clk); + } + + vpll = devm_kzalloc(&pdev->dev, sizeof(*vpll), GFP_KERNEL); + if (!vpll) + return ERR_PTR(-ENOMEM); + + vpll->dev = &pdev->dev; + vpll->clkctrl_base = clkctrl_base; + + pll = &vpll->pll; + + pll->name = id == 0 ? "video0" : "video1"; + pll->id = id == 0 ? DSS_PLL_VIDEO1 : DSS_PLL_VIDEO2; + pll->clkin = clk; + pll->regulator = regulator; + pll->base = pll_base; + pll->hw = &dss_dra7_video_pll_hw; + pll->ops = &dss_pll_ops; + + r = dss_pll_register(pll); + if (r) + return ERR_PTR(r); + + return pll; +} + +void dss_video_pll_uninit(struct dss_pll *pll) +{ + dss_pll_unregister(pll); +} |