Release 4.15 drivers/gpu/drm/msm/dsi/pll/dsi_pll_28nm_8960.c

Directory: drivers/gpu/drm/msm/dsi/pll
/*
 * Copyright (c) 2012-2015, The Linux Foundation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only 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.
 */

#include <linux/clk-provider.h>

#include "dsi_pll.h"
#include "dsi.xml.h"

/*
 * DSI PLL 28nm (8960/A family) - clock diagram (eg: DSI1):
 *
 *
 *                        +------+
 *  dsi1vco_clk ----o-----| DIV1 |---dsi1pllbit (not exposed as clock)
 *  F * byte_clk    |     +------+
 *                  | bit clock divider (F / 8)
 *                  |
 *                  |     +------+
 *                  o-----| DIV2 |---dsi0pllbyte---o---> To byte RCG
 *                  |     +------+                 | (sets parent rate)
 *                  | byte clock divider (F)       |
 *                  |                              |
 *                  |                              o---> To esc RCG
 *                  |                                (doesn't set parent rate)
 *                  |
 *                  |     +------+
 *                  o-----| DIV3 |----dsi0pll------o---> To dsi RCG
 *                        +------+                 | (sets parent rate)
 *                  dsi clock divider (F * magic)  |
 *                                                 |
 *                                                 o---> To pixel rcg
 *                                                  (doesn't set parent rate)
 */


#define POLL_MAX_READS		8000

#define POLL_TIMEOUT_US		1


#define NUM_PROVIDED_CLKS	2


#define VCO_REF_CLK_RATE	27000000

#define VCO_MIN_RATE		600000000

#define VCO_MAX_RATE		1200000000


#define DSI_BYTE_PLL_CLK	0

#define DSI_PIXEL_PLL_CLK	1


#define VCO_PREF_DIV_RATIO	27


struct pll_28nm_cached_state {
	
unsigned long vco_rate;
	
u8 postdiv3;
	
u8 postdiv2;
	
u8 postdiv1;
};


struct clk_bytediv {
	
struct clk_hw hw;
	
void __iomem *reg;
};


struct dsi_pll_28nm {
	
struct msm_dsi_pll base;

	
int id;
	
struct platform_device *pdev;
	
void __iomem *mmio;

	/* custom byte clock divider */
	
struct clk_bytediv *bytediv;

	/* private clocks: */
	
struct clk *clks[NUM_DSI_CLOCKS_MAX];
	
u32 num_clks;

	/* clock-provider: */
	
struct clk *provided_clks[NUM_PROVIDED_CLKS];
	
struct clk_onecell_data clk_data;

	
struct pll_28nm_cached_state cached_state;
};


#define to_pll_28nm(x)	container_of(x, struct dsi_pll_28nm, base)



static bool pll_28nm_poll_for_ready(struct dsi_pll_28nm *pll_28nm,
				    int nb_tries, int timeout_us)
{
	bool pll_locked = false;
	u32 val;

	while (nb_tries--) {
		val = pll_read(pll_28nm->mmio + REG_DSI_28nm_8960_PHY_PLL_RDY);
		pll_locked = !!(val & DSI_28nm_8960_PHY_PLL_RDY_PLL_RDY);

		if (pll_locked)
			break;

		udelay(timeout_us);
	}
	DBG("DSI PLL is %slocked", pll_locked ? "" : "*not* ");

	return pll_locked;
}

Contributors
Person Tokens Prop Commits CommitProp
Archit Taneja 77 100.00% 1 100.00%
Total 77 100.00% 1 100.00%

/*
 * Clock Callbacks
 */


static int dsi_pll_28nm_clk_set_rate(struct clk_hw *hw, unsigned long rate,
				     unsigned long parent_rate)
{
	struct msm_dsi_pll *pll = hw_clk_to_pll(hw);
	struct dsi_pll_28nm *pll_28nm = to_pll_28nm(pll);
	void __iomem *base = pll_28nm->mmio;
	u32 val, temp, fb_divider;

	DBG("rate=%lu, parent's=%lu", rate, parent_rate);

	temp = rate / 10;
	val = VCO_REF_CLK_RATE / 10;
	fb_divider = (temp * VCO_PREF_DIV_RATIO) / val;
	fb_divider = fb_divider / 2 - 1;
	pll_write(base + REG_DSI_28nm_8960_PHY_PLL_CTRL_1,
			fb_divider & 0xff);

	val = pll_read(base + REG_DSI_28nm_8960_PHY_PLL_CTRL_2);

	val |= (fb_divider >> 8) & 0x07;

	pll_write(base + REG_DSI_28nm_8960_PHY_PLL_CTRL_2,
			val);

	val = pll_read(base + REG_DSI_28nm_8960_PHY_PLL_CTRL_3);

	val |= (VCO_PREF_DIV_RATIO - 1) & 0x3f;

	pll_write(base + REG_DSI_28nm_8960_PHY_PLL_CTRL_3,
			val);

	pll_write(base + REG_DSI_28nm_8960_PHY_PLL_CTRL_6,
			0xf);

	val = pll_read(base + REG_DSI_28nm_8960_PHY_PLL_CTRL_8);
	val |= 0x7 << 4;
	pll_write(base + REG_DSI_28nm_8960_PHY_PLL_CTRL_8,
			val);

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Archit Taneja 197 100.00% 1 100.00%
Total 197 100.00% 1 100.00%



static int dsi_pll_28nm_clk_is_enabled(struct clk_hw *hw)
{
	struct msm_dsi_pll *pll = hw_clk_to_pll(hw);
	struct dsi_pll_28nm *pll_28nm = to_pll_28nm(pll);

	return pll_28nm_poll_for_ready(pll_28nm, POLL_MAX_READS,
					POLL_TIMEOUT_US);
}

Contributors
Person Tokens Prop Commits CommitProp
Archit Taneja 41 100.00% 1 100.00%
Total 41 100.00% 1 100.00%



static unsigned long dsi_pll_28nm_clk_recalc_rate(struct clk_hw *hw,
						  unsigned long parent_rate)
{
	struct msm_dsi_pll *pll = hw_clk_to_pll(hw);
	struct dsi_pll_28nm *pll_28nm = to_pll_28nm(pll);
	void __iomem *base = pll_28nm->mmio;
	unsigned long vco_rate;
	u32 status, fb_divider, temp, ref_divider;

	VERB("parent_rate=%lu", parent_rate);

	status = pll_read(base + REG_DSI_28nm_8960_PHY_PLL_CTRL_0);

	if (status & DSI_28nm_8960_PHY_PLL_CTRL_0_ENABLE) {
		fb_divider = pll_read(base + REG_DSI_28nm_8960_PHY_PLL_CTRL_1);
		fb_divider &= 0xff;
		temp = pll_read(base + REG_DSI_28nm_8960_PHY_PLL_CTRL_2) & 0x07;
		fb_divider = (temp << 8) | fb_divider;
		fb_divider += 1;

		ref_divider = pll_read(base + REG_DSI_28nm_8960_PHY_PLL_CTRL_3);
		ref_divider &= 0x3f;
		ref_divider += 1;

		/* multiply by 2 */
		vco_rate = (parent_rate / ref_divider) * fb_divider * 2;
	} else {
		vco_rate = 0;
	}

	DBG("returning vco rate = %lu", vco_rate);

	return vco_rate;
}

Contributors
Person Tokens Prop Commits CommitProp
Archit Taneja 167 100.00% 1 100.00%
Total 167 100.00% 1 100.00%


static const struct clk_ops clk_ops_dsi_pll_28nm_vco = {
	.round_rate = msm_dsi_pll_helper_clk_round_rate,
	.set_rate = dsi_pll_28nm_clk_set_rate,
	.recalc_rate = dsi_pll_28nm_clk_recalc_rate,
	.prepare = msm_dsi_pll_helper_clk_prepare,
	.unprepare = msm_dsi_pll_helper_clk_unprepare,
	.is_enabled = dsi_pll_28nm_clk_is_enabled,
};

/*
 * Custom byte clock divier clk_ops
 *
 * This clock is the entry point to configuring the PLL. The user (dsi host)
 * will set this clock's rate to the desired byte clock rate. The VCO lock
 * frequency is a multiple of the byte clock rate. The multiplication factor
 * (shown as F in the diagram above) is a function of the byte clock rate.
 *
 * This custom divider clock ensures that its parent (VCO) is set to the
 * desired rate, and that the byte clock postdivider (POSTDIV2) is configured
 * accordingly
 */

#define to_clk_bytediv(_hw) container_of(_hw, struct clk_bytediv, hw)



static unsigned long clk_bytediv_recalc_rate(struct clk_hw *hw,
		unsigned long parent_rate)
{
	struct clk_bytediv *bytediv = to_clk_bytediv(hw);
	unsigned int div;

	div = pll_read(bytediv->reg) & 0xff;

	return parent_rate / (div + 1);
}

Contributors
Person Tokens Prop Commits CommitProp
Archit Taneja 50 100.00% 1 100.00%
Total 50 100.00% 1 100.00%

/* find multiplication factor(wrt byte clock) at which the VCO should be set */


static unsigned int get_vco_mul_factor(unsigned long byte_clk_rate)
{
	unsigned long bit_mhz;

	/* convert to bit clock in Mhz */
	bit_mhz = (byte_clk_rate * 8) / 1000000;

	if (bit_mhz < 125)
		return 64;
	else if (bit_mhz < 250)
		return 32;
	else if (bit_mhz < 600)
		return 16;
	else
		return 8;
}

Contributors
Person Tokens Prop Commits CommitProp
Archit Taneja 59 100.00% 1 100.00%
Total 59 100.00% 1 100.00%



static long clk_bytediv_round_rate(struct clk_hw *hw, unsigned long rate,
				   unsigned long *prate)
{
	unsigned long best_parent;
	unsigned int factor;

	factor = get_vco_mul_factor(rate);

	best_parent = rate * factor;
	*prate = clk_hw_round_rate(clk_hw_get_parent(hw), best_parent);

	return *prate / factor;
}

Contributors
Person Tokens Prop Commits CommitProp
Archit Taneja 60 100.00% 1 100.00%
Total 60 100.00% 1 100.00%



static int clk_bytediv_set_rate(struct clk_hw *hw, unsigned long rate,
				unsigned long parent_rate)
{
	struct clk_bytediv *bytediv = to_clk_bytediv(hw);
	u32 val;
	unsigned int factor;

	factor = get_vco_mul_factor(rate);

	val = pll_read(bytediv->reg);
	val |= (factor - 1) & 0xff;
	pll_write(bytediv->reg, val);

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Archit Taneja 74 100.00% 1 100.00%
Total 74 100.00% 1 100.00%

/* Our special byte clock divider ops */

static const struct clk_ops clk_bytediv_ops = {
	.round_rate = clk_bytediv_round_rate,
	.set_rate = clk_bytediv_set_rate,
	.recalc_rate = clk_bytediv_recalc_rate,
};

/*
 * PLL Callbacks
 */


static int dsi_pll_28nm_enable_seq(struct msm_dsi_pll *pll)
{
	struct dsi_pll_28nm *pll_28nm = to_pll_28nm(pll);
	struct device *dev = &pll_28nm->pdev->dev;
	void __iomem *base = pll_28nm->mmio;
	bool locked;
	unsigned int bit_div, byte_div;
	int max_reads = 1000, timeout_us = 100;
	u32 val;

	DBG("id=%d", pll_28nm->id);

	/*
         * before enabling the PLL, configure the bit clock divider since we
         * don't expose it as a clock to the outside world
         * 1: read back the byte clock divider that should already be set
         * 2: divide by 8 to get bit clock divider
         * 3: write it to POSTDIV1
         */
	val = pll_read(base + REG_DSI_28nm_8960_PHY_PLL_CTRL_9);
	byte_div = val + 1;
	bit_div = byte_div / 8;

	val = pll_read(base + REG_DSI_28nm_8960_PHY_PLL_CTRL_8);
	val &= ~0xf;
	val |= (bit_div - 1);
	pll_write(base + REG_DSI_28nm_8960_PHY_PLL_CTRL_8, val);

	/* enable the PLL */
	pll_write(base + REG_DSI_28nm_8960_PHY_PLL_CTRL_0,
			DSI_28nm_8960_PHY_PLL_CTRL_0_ENABLE);

	locked = pll_28nm_poll_for_ready(pll_28nm, max_reads, timeout_us);

	if (unlikely(!locked))
		dev_err(dev, "DSI PLL lock failed\n");
	else
		DBG("DSI PLL lock success");

	return locked ? 0 : -EINVAL;
}

Contributors
Person Tokens Prop Commits CommitProp
Archit Taneja 175 100.00% 1 100.00%
Total 175 100.00% 1 100.00%



static void dsi_pll_28nm_disable_seq(struct msm_dsi_pll *pll)
{
	struct dsi_pll_28nm *pll_28nm = to_pll_28nm(pll);

	DBG("id=%d", pll_28nm->id);
	pll_write(pll_28nm->mmio + REG_DSI_28nm_8960_PHY_PLL_CTRL_0, 0x00);
}

Contributors
Person Tokens Prop Commits CommitProp
Archit Taneja 41 100.00% 1 100.00%
Total 41 100.00% 1 100.00%



static void dsi_pll_28nm_save_state(struct msm_dsi_pll *pll)
{
	struct dsi_pll_28nm *pll_28nm = to_pll_28nm(pll);
	struct pll_28nm_cached_state *cached_state = &pll_28nm->cached_state;
	void __iomem *base = pll_28nm->mmio;

	cached_state->postdiv3 =
			pll_read(base + REG_DSI_28nm_8960_PHY_PLL_CTRL_10);
	cached_state->postdiv2 =
			pll_read(base + REG_DSI_28nm_8960_PHY_PLL_CTRL_9);
	cached_state->postdiv1 =
			pll_read(base + REG_DSI_28nm_8960_PHY_PLL_CTRL_8);

	cached_state->vco_rate = clk_hw_get_rate(&pll->clk_hw);
}

Contributors
Person Tokens Prop Commits CommitProp
Archit Taneja 85 100.00% 1 100.00%
Total 85 100.00% 1 100.00%



static int dsi_pll_28nm_restore_state(struct msm_dsi_pll *pll)
{
	struct dsi_pll_28nm *pll_28nm = to_pll_28nm(pll);
	struct pll_28nm_cached_state *cached_state = &pll_28nm->cached_state;
	void __iomem *base = pll_28nm->mmio;
	int ret;

	ret = dsi_pll_28nm_clk_set_rate(&pll->clk_hw,
					cached_state->vco_rate, 0);
	if (ret) {
		dev_err(&pll_28nm->pdev->dev,
			"restore vco rate failed. ret=%d\n", ret);
		return ret;
	}

	pll_write(base + REG_DSI_28nm_8960_PHY_PLL_CTRL_10,
			cached_state->postdiv3);
	pll_write(base + REG_DSI_28nm_8960_PHY_PLL_CTRL_9,
			cached_state->postdiv2);
	pll_write(base + REG_DSI_28nm_8960_PHY_PLL_CTRL_8,
			cached_state->postdiv1);

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Archit Taneja 118 100.00% 1 100.00%
Total 118 100.00% 1 100.00%



static int dsi_pll_28nm_get_provider(struct msm_dsi_pll *pll,
				struct clk **byte_clk_provider,
				struct clk **pixel_clk_provider)
{
	struct dsi_pll_28nm *pll_28nm = to_pll_28nm(pll);

	if (byte_clk_provider)
		*byte_clk_provider = pll_28nm->provided_clks[DSI_BYTE_PLL_CLK];
	if (pixel_clk_provider)
		*pixel_clk_provider =
				pll_28nm->provided_clks[DSI_PIXEL_PLL_CLK];

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Archit Taneja 64 100.00% 1 100.00%
Total 64 100.00% 1 100.00%



static void dsi_pll_28nm_destroy(struct msm_dsi_pll *pll)
{
	struct dsi_pll_28nm *pll_28nm = to_pll_28nm(pll);

	msm_dsi_pll_helper_unregister_clks(pll_28nm->pdev,
					pll_28nm->clks, pll_28nm->num_clks);
}

Contributors
Person Tokens Prop Commits CommitProp
Archit Taneja 36 100.00% 1 100.00%
Total 36 100.00% 1 100.00%



static int pll_28nm_register(struct dsi_pll_28nm *pll_28nm)
{
	char *clk_name, *parent_name, *vco_name;
	struct clk_init_data vco_init = {
		.parent_names = (const char *[]){ "pxo" },
		.num_parents = 1,
		.flags = CLK_IGNORE_UNUSED,
		.ops = &clk_ops_dsi_pll_28nm_vco,
        };
	struct device *dev = &pll_28nm->pdev->dev;
	struct clk **clks = pll_28nm->clks;
	struct clk **provided_clks = pll_28nm->provided_clks;
	struct clk_bytediv *bytediv;
	struct clk_init_data bytediv_init = { };
	int ret, num = 0;

	DBG("%d", pll_28nm->id);

	bytediv = devm_kzalloc(dev, sizeof(*bytediv), GFP_KERNEL);
	if (!bytediv)
		return -ENOMEM;

	vco_name = devm_kzalloc(dev, 32, GFP_KERNEL);
	if (!vco_name)
		return -ENOMEM;

	parent_name = devm_kzalloc(dev, 32, GFP_KERNEL);
	if (!parent_name)
		return -ENOMEM;

	clk_name = devm_kzalloc(dev, 32, GFP_KERNEL);
	if (!clk_name)
		return -ENOMEM;

	pll_28nm->bytediv = bytediv;

	snprintf(vco_name, 32, "dsi%dvco_clk", pll_28nm->id);
	vco_init.name = vco_name;

	pll_28nm->base.clk_hw.init = &vco_init;

	clks[num++] = clk_register(dev, &pll_28nm->base.clk_hw);

	/* prepare and register bytediv */
	bytediv->hw.init = &bytediv_init;
	bytediv->reg = pll_28nm->mmio + REG_DSI_28nm_8960_PHY_PLL_CTRL_9;

	snprintf(parent_name, 32, "dsi%dvco_clk", pll_28nm->id);
	snprintf(clk_name, 32, "dsi%dpllbyte", pll_28nm->id);

	bytediv_init.name = clk_name;
	bytediv_init.ops = &clk_bytediv_ops;
	bytediv_init.flags = CLK_SET_RATE_PARENT;
	bytediv_init.parent_names = (const char * const *) &parent_name;
	bytediv_init.num_parents = 1;

	/* DIV2 */
	clks[num++] = provided_clks[DSI_BYTE_PLL_CLK] =
			clk_register(dev, &bytediv->hw);

	snprintf(clk_name, 32, "dsi%dpll", pll_28nm->id);
	/* DIV3 */
	clks[num++] = provided_clks[DSI_PIXEL_PLL_CLK] =
			clk_register_divider(dev, clk_name,
				parent_name, 0, pll_28nm->mmio +
				REG_DSI_28nm_8960_PHY_PLL_CTRL_10,
				0, 8, 0, NULL);

	pll_28nm->num_clks = num;

	pll_28nm->clk_data.clk_num = NUM_PROVIDED_CLKS;
	pll_28nm->clk_data.clks = provided_clks;

	ret = of_clk_add_provider(dev->of_node,
			of_clk_src_onecell_get, &pll_28nm->clk_data);
	if (ret) {
		dev_err(dev, "failed to register clk provider: %d\n", ret);
		return ret;
	}

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Archit Taneja 469 100.00% 2 100.00%
Total 469 100.00% 2 100.00%



struct msm_dsi_pll *msm_dsi_pll_28nm_8960_init(struct platform_device *pdev,
					       int id)
{
	struct dsi_pll_28nm *pll_28nm;
	struct msm_dsi_pll *pll;
	int ret;

	if (!pdev)
		return ERR_PTR(-ENODEV);

	pll_28nm = devm_kzalloc(&pdev->dev, sizeof(*pll_28nm), GFP_KERNEL);
	if (!pll_28nm)
		return ERR_PTR(-ENOMEM);

	pll_28nm->pdev = pdev;
	pll_28nm->id = id + 1;

	pll_28nm->mmio = msm_ioremap(pdev, "dsi_pll", "DSI_PLL");
	if (IS_ERR_OR_NULL(pll_28nm->mmio)) {
		dev_err(&pdev->dev, "%s: failed to map pll base\n", __func__);
		return ERR_PTR(-ENOMEM);
	}

	pll = &pll_28nm->base;
	pll->min_rate = VCO_MIN_RATE;
	pll->max_rate = VCO_MAX_RATE;
	pll->get_provider = dsi_pll_28nm_get_provider;
	pll->destroy = dsi_pll_28nm_destroy;
	pll->disable_seq = dsi_pll_28nm_disable_seq;
	pll->save_state = dsi_pll_28nm_save_state;
	pll->restore_state = dsi_pll_28nm_restore_state;

	pll->en_seq_cnt = 1;
	pll->enable_seqs[0] = dsi_pll_28nm_enable_seq;

	ret = pll_28nm_register(pll_28nm);
	if (ret) {
		dev_err(&pdev->dev, "failed to register PLL: %d\n", ret);
		return ERR_PTR(ret);
	}

	return pll;
}
Contributors
Person Tokens Prop Commits CommitProp
Archit Taneja 225 100.00% 1 100.00%
Total 225 100.00% 1 100.00%

Overall Contributors
Person Tokens Prop Commits CommitProp
Archit Taneja 2154 100.00% 2 100.00%
Total 2154 100.00% 2 100.00%
Directory: drivers/gpu/drm/msm/dsi/pll

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.
Person	Tokens	Prop	Commits	CommitProp
Archit Taneja	77	100.00%	1	100.00%
Total	77	100.00%	1	100.00%
cregit-Linux how code gets into the kernel

Release 4.15 drivers/gpu/drm/msm/dsi/pll/dsi_pll_28nm_8960.c

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Overall Contributors
