1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2012 Russell King
4 *
5 * Armada 510 (aka Dove) variant support
6 */
7#include <linux/clk.h>
8#include <linux/io.h>
9#include <drm/drm_probe_helper.h>
10#include "armada_crtc.h"
11#include "armada_drm.h"
12#include "armada_hw.h"
13
14struct armada510_variant_data {
15	struct clk *clks[4];
16	struct clk *sel_clk;
17};
18
19static int armada510_crtc_init(struct armada_crtc *dcrtc, struct device *dev)
20{
21	struct armada510_variant_data *v;
22	struct clk *clk;
23	int idx;
24
25	v = devm_kzalloc(dev, sizeof(*v), GFP_KERNEL);
26	if (!v)
27		return -ENOMEM;
28
29	dcrtc->variant_data = v;
30
31	if (dev->of_node) {
32		struct property *prop;
33		const char *s;
34
35		of_property_for_each_string(dev->of_node, "clock-names", prop,
36					    s) {
37			if (!strcmp(s, "ext_ref_clk0"))
38				idx = 0;
39			else if (!strcmp(s, "ext_ref_clk1"))
40				idx = 1;
41			else if (!strcmp(s, "plldivider"))
42				idx = 2;
43			else if (!strcmp(s, "axibus"))
44				idx = 3;
45			else
46				continue;
47
48			clk = devm_clk_get(dev, s);
49			if (IS_ERR(clk))
50				return PTR_ERR(clk) == -ENOENT ? -EPROBE_DEFER :
51					PTR_ERR(clk);
52			v->clks[idx] = clk;
53		}
54	} else {
55		clk = devm_clk_get(dev, "ext_ref_clk1");
56		if (IS_ERR(clk))
57			return PTR_ERR(clk) == -ENOENT ? -EPROBE_DEFER :
58				PTR_ERR(clk);
59
60		v->clks[1] = clk;
61	}
62
63	/*
64	 * Lower the watermark so to eliminate jitter at higher bandwidths.
65	 * Disable SRAM read wait state to avoid system hang with external
66	 * clock.
67	 */
68	armada_updatel(CFG_DMA_WM(0x20), CFG_SRAM_WAIT | CFG_DMA_WM_MASK,
69		       dcrtc->base + LCD_CFG_RDREG4F);
70
71	/* Initialise SPU register */
72	writel_relaxed(ADV_HWC32ENABLE | ADV_HWC32ARGB | ADV_HWC32BLEND,
73		       dcrtc->base + LCD_SPU_ADV_REG);
74
75	return 0;
76}
77
78static const u32 armada510_clk_sels[] = {
79	SCLK_510_EXTCLK0,
80	SCLK_510_EXTCLK1,
81	SCLK_510_PLL,
82	SCLK_510_AXI,
83};
84
85static const struct armada_clocking_params armada510_clocking = {
86	/* HDMI requires -0.6%..+0.5% */
87	.permillage_min = 994,
88	.permillage_max = 1005,
89	.settable = BIT(0) | BIT(1),
90	.div_max = SCLK_510_INT_DIV_MASK,
91};
92
93/*
94 * Armada510 specific SCLK register selection.
95 * This gets called with sclk = NULL to test whether the mode is
96 * supportable, and again with sclk != NULL to set the clocks up for
97 * that.  The former can return an error, but the latter is expected
98 * not to.
99 */
100static int armada510_crtc_compute_clock(struct armada_crtc *dcrtc,
101	const struct drm_display_mode *mode, uint32_t *sclk)
102{
103	struct armada510_variant_data *v = dcrtc->variant_data;
104	unsigned long desired_khz = mode->crtc_clock;
105	struct armada_clk_result res;
106	int ret, idx;
107
108	idx = armada_crtc_select_clock(dcrtc, &res, &armada510_clocking,
109				       v->clks, ARRAY_SIZE(v->clks),
110				       desired_khz);
111	if (idx < 0)
112		return idx;
113
114	ret = clk_prepare_enable(res.clk);
115	if (ret)
116		return ret;
117
118	if (sclk) {
119		clk_set_rate(res.clk, res.desired_clk_hz);
120
121		*sclk = res.div | armada510_clk_sels[idx];
122
123		/* We are now using this clock */
124		v->sel_clk = res.clk;
125		swap(dcrtc->clk, res.clk);
126	}
127
128	clk_disable_unprepare(res.clk);
129
130	return 0;
131}
132
133static void armada510_crtc_disable(struct armada_crtc *dcrtc)
134{
135	if (dcrtc->clk) {
136		clk_disable_unprepare(dcrtc->clk);
137		dcrtc->clk = NULL;
138	}
139}
140
141static void armada510_crtc_enable(struct armada_crtc *dcrtc,
142	const struct drm_display_mode *mode)
143{
144	struct armada510_variant_data *v = dcrtc->variant_data;
145
146	if (!dcrtc->clk && v->sel_clk) {
147		if (!WARN_ON(clk_prepare_enable(v->sel_clk)))
148			dcrtc->clk = v->sel_clk;
149	}
150}
151
152const struct armada_variant armada510_ops = {
153	.has_spu_adv_reg = true,
154	.init = armada510_crtc_init,
155	.compute_clock = armada510_crtc_compute_clock,
156	.disable = armada510_crtc_disable,
157	.enable = armada510_crtc_enable,
158};
159