2 * Copyright (C) 2014 Texas Instruments Ltd
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License version 2 as published by
6 * the Free Software Foundation.
8 * You should have received a copy of the GNU General Public License along with
9 * this program. If not, see <http://www.gnu.org/licenses/>.
12 #include <linux/clk.h>
13 #include <linux/delay.h>
14 #include <linux/err.h>
16 #include <linux/kernel.h>
17 #include <linux/platform_device.h>
18 #include <linux/sched.h>
20 #include <video/omapfb_dss.h>
23 #include "dss_features.h"
25 struct dss_video_pll
{
30 void __iomem
*clkctrl_base
;
33 #define REG_MOD(reg, val, start, end) \
34 writel_relaxed(FLD_MOD(readl_relaxed(reg), val, start, end), reg)
36 static void dss_dpll_enable_scp_clk(struct dss_video_pll
*vpll
)
38 REG_MOD(vpll
->clkctrl_base
, 1, 14, 14); /* CIO_CLK_ICG */
41 static void dss_dpll_disable_scp_clk(struct dss_video_pll
*vpll
)
43 REG_MOD(vpll
->clkctrl_base
, 0, 14, 14); /* CIO_CLK_ICG */
46 static void dss_dpll_power_enable(struct dss_video_pll
*vpll
)
48 REG_MOD(vpll
->clkctrl_base
, 2, 31, 30); /* PLL_POWER_ON_ALL */
51 * DRA7x PLL CTRL's PLL_PWR_STATUS seems to always return 0,
52 * so we have to use fixed delay here.
57 static void dss_dpll_power_disable(struct dss_video_pll
*vpll
)
59 REG_MOD(vpll
->clkctrl_base
, 0, 31, 30); /* PLL_POWER_OFF */
62 static int dss_video_pll_enable(struct dss_pll
*pll
)
64 struct dss_video_pll
*vpll
= container_of(pll
, struct dss_video_pll
, pll
);
67 r
= dss_runtime_get();
71 dss_ctrl_pll_enable(pll
->id
, true);
73 dss_dpll_enable_scp_clk(vpll
);
75 r
= dss_pll_wait_reset_done(pll
);
79 dss_dpll_power_enable(vpll
);
84 dss_dpll_disable_scp_clk(vpll
);
85 dss_ctrl_pll_enable(pll
->id
, false);
91 static void dss_video_pll_disable(struct dss_pll
*pll
)
93 struct dss_video_pll
*vpll
= container_of(pll
, struct dss_video_pll
, pll
);
95 dss_dpll_power_disable(vpll
);
97 dss_dpll_disable_scp_clk(vpll
);
99 dss_ctrl_pll_enable(pll
->id
, false);
104 static const struct dss_pll_ops dss_pll_ops
= {
105 .enable
= dss_video_pll_enable
,
106 .disable
= dss_video_pll_disable
,
107 .set_config
= dss_pll_write_config_type_a
,
110 static const struct dss_pll_hw dss_dra7_video_pll_hw
= {
111 .n_max
= (1 << 8) - 1,
112 .m_max
= (1 << 12) - 1,
113 .mX_max
= (1 << 5) - 1,
116 .clkdco_max
= 1800000000,
131 struct dss_pll
*dss_video_pll_init(struct platform_device
*pdev
, int id
,
132 struct regulator
*regulator
)
134 const char * const reg_name
[] = { "pll1", "pll2" };
135 const char * const clkctrl_name
[] = { "pll1_clkctrl", "pll2_clkctrl" };
136 const char * const clkin_name
[] = { "video1_clk", "video2_clk" };
138 struct resource
*res
;
139 struct dss_video_pll
*vpll
;
140 void __iomem
*pll_base
, *clkctrl_base
;
147 res
= platform_get_resource_byname(pdev
, IORESOURCE_MEM
, reg_name
[id
]);
150 "missing platform resource data for pll%d\n", id
);
151 return ERR_PTR(-ENODEV
);
154 pll_base
= devm_ioremap_resource(&pdev
->dev
, res
);
155 if (IS_ERR(pll_base
)) {
156 dev_err(&pdev
->dev
, "failed to ioremap pll%d reg_name\n", id
);
157 return ERR_CAST(pll_base
);
162 res
= platform_get_resource_byname(pdev
, IORESOURCE_MEM
,
166 "missing platform resource data for pll%d\n", id
);
167 return ERR_PTR(-ENODEV
);
170 clkctrl_base
= devm_ioremap_resource(&pdev
->dev
, res
);
171 if (IS_ERR(clkctrl_base
)) {
172 dev_err(&pdev
->dev
, "failed to ioremap pll%d clkctrl\n", id
);
173 return ERR_CAST(clkctrl_base
);
178 clk
= devm_clk_get(&pdev
->dev
, clkin_name
[id
]);
180 DSSERR("can't get video pll clkin\n");
181 return ERR_CAST(clk
);
184 vpll
= devm_kzalloc(&pdev
->dev
, sizeof(*vpll
), GFP_KERNEL
);
186 return ERR_PTR(-ENOMEM
);
188 vpll
->dev
= &pdev
->dev
;
189 vpll
->clkctrl_base
= clkctrl_base
;
193 pll
->name
= id
== 0 ? "video0" : "video1";
194 pll
->id
= id
== 0 ? DSS_PLL_VIDEO1
: DSS_PLL_VIDEO2
;
196 pll
->regulator
= regulator
;
197 pll
->base
= pll_base
;
198 pll
->hw
= &dss_dra7_video_pll_hw
;
199 pll
->ops
= &dss_pll_ops
;
201 r
= dss_pll_register(pll
);
208 void dss_video_pll_uninit(struct dss_pll
*pll
)
210 dss_pll_unregister(pll
);