[linux-2.6-block.git] / drivers / clk / imx / clk-pllv2.c

#include <linux/kernel.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/errno.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/err.h>

#include <asm/div64.h>

#include "clk.h"

#define to_clk_pllv2(clk) (container_of(clk, struct clk_pllv2, clk))

/* PLL Register Offsets */
#define MXC_PLL_DP_CTL			0x00
#define MXC_PLL_DP_CONFIG		0x04
#define MXC_PLL_DP_OP			0x08
#define MXC_PLL_DP_MFD			0x0C
#define MXC_PLL_DP_MFN			0x10
#define MXC_PLL_DP_MFNMINUS		0x14
#define MXC_PLL_DP_MFNPLUS		0x18
#define MXC_PLL_DP_HFS_OP		0x1C
#define MXC_PLL_DP_HFS_MFD		0x20
#define MXC_PLL_DP_HFS_MFN		0x24
#define MXC_PLL_DP_MFN_TOGC		0x28
#define MXC_PLL_DP_DESTAT		0x2c

/* PLL Register Bit definitions */
#define MXC_PLL_DP_CTL_MUL_CTRL		0x2000
#define MXC_PLL_DP_CTL_DPDCK0_2_EN	0x1000
#define MXC_PLL_DP_CTL_DPDCK0_2_OFFSET	12
#define MXC_PLL_DP_CTL_ADE		0x800
#define MXC_PLL_DP_CTL_REF_CLK_DIV	0x400
#define MXC_PLL_DP_CTL_REF_CLK_SEL_MASK	(3 << 8)
#define MXC_PLL_DP_CTL_REF_CLK_SEL_OFFSET	8
#define MXC_PLL_DP_CTL_HFSM		0x80
#define MXC_PLL_DP_CTL_PRE		0x40
#define MXC_PLL_DP_CTL_UPEN		0x20
#define MXC_PLL_DP_CTL_RST		0x10
#define MXC_PLL_DP_CTL_RCP		0x8
#define MXC_PLL_DP_CTL_PLM		0x4
#define MXC_PLL_DP_CTL_BRM0		0x2
#define MXC_PLL_DP_CTL_LRF		0x1

#define MXC_PLL_DP_CONFIG_BIST		0x8
#define MXC_PLL_DP_CONFIG_SJC_CE	0x4
#define MXC_PLL_DP_CONFIG_AREN		0x2
#define MXC_PLL_DP_CONFIG_LDREQ		0x1

#define MXC_PLL_DP_OP_MFI_OFFSET	4
#define MXC_PLL_DP_OP_MFI_MASK		(0xF << 4)
#define MXC_PLL_DP_OP_PDF_OFFSET	0
#define MXC_PLL_DP_OP_PDF_MASK		0xF

#define MXC_PLL_DP_MFD_OFFSET		0
#define MXC_PLL_DP_MFD_MASK		0x07FFFFFF

#define MXC_PLL_DP_MFN_OFFSET		0x0
#define MXC_PLL_DP_MFN_MASK		0x07FFFFFF

#define MXC_PLL_DP_MFN_TOGC_TOG_DIS	(1 << 17)
#define MXC_PLL_DP_MFN_TOGC_TOG_EN	(1 << 16)
#define MXC_PLL_DP_MFN_TOGC_CNT_OFFSET	0x0
#define MXC_PLL_DP_MFN_TOGC_CNT_MASK	0xFFFF

#define MXC_PLL_DP_DESTAT_TOG_SEL	(1 << 31)
#define MXC_PLL_DP_DESTAT_MFN		0x07FFFFFF

#define MAX_DPLL_WAIT_TRIES	1000 /* 1000 * udelay(1) = 1ms */

struct clk_pllv2 {
	struct clk_hw	hw;
	void __iomem	*base;
};

static unsigned long __clk_pllv2_recalc_rate(unsigned long parent_rate,
		u32 dp_ctl, u32 dp_op, u32 dp_mfd, u32 dp_mfn)
{
	long mfi, mfn, mfd, pdf, ref_clk;
	unsigned long dbl;
	u64 temp;

	dbl = dp_ctl & MXC_PLL_DP_CTL_DPDCK0_2_EN;

	pdf = dp_op & MXC_PLL_DP_OP_PDF_MASK;
	mfi = (dp_op & MXC_PLL_DP_OP_MFI_MASK) >> MXC_PLL_DP_OP_MFI_OFFSET;
	mfi = (mfi <= 5) ? 5 : mfi;
	mfd = dp_mfd & MXC_PLL_DP_MFD_MASK;
	mfn = dp_mfn & MXC_PLL_DP_MFN_MASK;
	mfn = sign_extend32(mfn, 26);

	ref_clk = 2 * parent_rate;
	if (dbl != 0)
		ref_clk *= 2;

	ref_clk /= (pdf + 1);
	temp = (u64) ref_clk * abs(mfn);
	do_div(temp, mfd + 1);
	if (mfn < 0)
		temp = (ref_clk * mfi) - temp;
	else
		temp = (ref_clk * mfi) + temp;

	return temp;
}

static unsigned long clk_pllv2_recalc_rate(struct clk_hw *hw,
		unsigned long parent_rate)
{
	u32 dp_op, dp_mfd, dp_mfn, dp_ctl;
	void __iomem *pllbase;
	struct clk_pllv2 *pll = to_clk_pllv2(hw);

	pllbase = pll->base;

	dp_ctl = __raw_readl(pllbase + MXC_PLL_DP_CTL);
	dp_op = __raw_readl(pllbase + MXC_PLL_DP_OP);
	dp_mfd = __raw_readl(pllbase + MXC_PLL_DP_MFD);
	dp_mfn = __raw_readl(pllbase + MXC_PLL_DP_MFN);

	return __clk_pllv2_recalc_rate(parent_rate, dp_ctl, dp_op, dp_mfd, dp_mfn);
}

static int __clk_pllv2_set_rate(unsigned long rate, unsigned long parent_rate,
		u32 *dp_op, u32 *dp_mfd, u32 *dp_mfn)
{
	u32 reg;
	long mfi, pdf, mfn, mfd = 999999;
	u64 temp64;
	unsigned long quad_parent_rate;

	quad_parent_rate = 4 * parent_rate;
	pdf = mfi = -1;
	while (++pdf < 16 && mfi < 5)
		mfi = rate * (pdf+1) / quad_parent_rate;
	if (mfi > 15)
		return -EINVAL;
	pdf--;

	temp64 = rate * (pdf + 1) - quad_parent_rate * mfi;
	do_div(temp64, quad_parent_rate / 1000000);
	mfn = (long)temp64;

	reg = mfi << 4 | pdf;

	*dp_op = reg;
	*dp_mfd = mfd;
	*dp_mfn = mfn;

	return 0;
}

static int clk_pllv2_set_rate(struct clk_hw *hw, unsigned long rate,
		unsigned long parent_rate)
{
	struct clk_pllv2 *pll = to_clk_pllv2(hw);
	void __iomem *pllbase;
	u32 dp_ctl, dp_op, dp_mfd, dp_mfn;
	int ret;

	pllbase = pll->base;


	ret = __clk_pllv2_set_rate(rate, parent_rate, &dp_op, &dp_mfd, &dp_mfn);
	if (ret)
		return ret;

	dp_ctl = __raw_readl(pllbase + MXC_PLL_DP_CTL);
	/* use dpdck0_2 */
	__raw_writel(dp_ctl | 0x1000L, pllbase + MXC_PLL_DP_CTL);

	__raw_writel(dp_op, pllbase + MXC_PLL_DP_OP);
	__raw_writel(dp_mfd, pllbase + MXC_PLL_DP_MFD);
	__raw_writel(dp_mfn, pllbase + MXC_PLL_DP_MFN);

	return 0;
}

static long clk_pllv2_round_rate(struct clk_hw *hw, unsigned long rate,
		unsigned long *prate)
{
	u32 dp_op, dp_mfd, dp_mfn;

	__clk_pllv2_set_rate(rate, *prate, &dp_op, &dp_mfd, &dp_mfn);
	return __clk_pllv2_recalc_rate(*prate, MXC_PLL_DP_CTL_DPDCK0_2_EN,
			dp_op, dp_mfd, dp_mfn);
}

static int clk_pllv2_prepare(struct clk_hw *hw)
{
	struct clk_pllv2 *pll = to_clk_pllv2(hw);
	u32 reg;
	void __iomem *pllbase;
	int i = 0;

	pllbase = pll->base;
	reg = __raw_readl(pllbase + MXC_PLL_DP_CTL) | MXC_PLL_DP_CTL_UPEN;
	__raw_writel(reg, pllbase + MXC_PLL_DP_CTL);

	/* Wait for lock */
	do {
		reg = __raw_readl(pllbase + MXC_PLL_DP_CTL);
		if (reg & MXC_PLL_DP_CTL_LRF)
			break;

		udelay(1);
	} while (++i < MAX_DPLL_WAIT_TRIES);

	if (i == MAX_DPLL_WAIT_TRIES) {
		pr_err("MX5: pll locking failed\n");
		return -EINVAL;
	}

	return 0;
}

static void clk_pllv2_unprepare(struct clk_hw *hw)
{
	struct clk_pllv2 *pll = to_clk_pllv2(hw);
	u32 reg;
	void __iomem *pllbase;

	pllbase = pll->base;
	reg = __raw_readl(pllbase + MXC_PLL_DP_CTL) & ~MXC_PLL_DP_CTL_UPEN;
	__raw_writel(reg, pllbase + MXC_PLL_DP_CTL);
}

static struct clk_ops clk_pllv2_ops = {
	.prepare = clk_pllv2_prepare,
	.unprepare = clk_pllv2_unprepare,
	.recalc_rate = clk_pllv2_recalc_rate,
	.round_rate = clk_pllv2_round_rate,
	.set_rate = clk_pllv2_set_rate,
};

struct clk *imx_clk_pllv2(const char *name, const char *parent,
		void __iomem *base)
{
	struct clk_pllv2 *pll;
	struct clk *clk;
	struct clk_init_data init;

	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
	if (!pll)
		return ERR_PTR(-ENOMEM);

	pll->base = base;

	init.name = name;
	init.ops = &clk_pllv2_ops;
	init.flags = 0;
	init.parent_names = &parent;
	init.num_parents = 1;

	pll->hw.init = &init;

	clk = clk_register(NULL, &pll->hw);
	if (IS_ERR(clk))
		kfree(pll);

	return clk;
}
Commit	Line	Data
a547b816 SH	1	#include <linux/kernel.h>
	2	#include <linux/clk.h>
	3	#include <linux/io.h>
	4	#include <linux/errno.h>
	5	#include <linux/delay.h>
	6	#include <linux/slab.h>
	7	#include <linux/err.h>
	8
	9	#include <asm/div64.h>
	10
	11	#include "clk.h"
	12
	13	#define to_clk_pllv2(clk) (container_of(clk, struct clk_pllv2, clk))
	14
	15	/* PLL Register Offsets */
	16	#define MXC_PLL_DP_CTL 0x00
	17	#define MXC_PLL_DP_CONFIG 0x04
	18	#define MXC_PLL_DP_OP 0x08
	19	#define MXC_PLL_DP_MFD 0x0C
	20	#define MXC_PLL_DP_MFN 0x10
	21	#define MXC_PLL_DP_MFNMINUS 0x14
	22	#define MXC_PLL_DP_MFNPLUS 0x18
	23	#define MXC_PLL_DP_HFS_OP 0x1C
	24	#define MXC_PLL_DP_HFS_MFD 0x20
	25	#define MXC_PLL_DP_HFS_MFN 0x24
	26	#define MXC_PLL_DP_MFN_TOGC 0x28
	27	#define MXC_PLL_DP_DESTAT 0x2c
	28
	29	/* PLL Register Bit definitions */
	30	#define MXC_PLL_DP_CTL_MUL_CTRL 0x2000
	31	#define MXC_PLL_DP_CTL_DPDCK0_2_EN 0x1000
	32	#define MXC_PLL_DP_CTL_DPDCK0_2_OFFSET 12
	33	#define MXC_PLL_DP_CTL_ADE 0x800
	34	#define MXC_PLL_DP_CTL_REF_CLK_DIV 0x400
	35	#define MXC_PLL_DP_CTL_REF_CLK_SEL_MASK (3 << 8)
	36	#define MXC_PLL_DP_CTL_REF_CLK_SEL_OFFSET 8
	37	#define MXC_PLL_DP_CTL_HFSM 0x80
	38	#define MXC_PLL_DP_CTL_PRE 0x40
	39	#define MXC_PLL_DP_CTL_UPEN 0x20
	40	#define MXC_PLL_DP_CTL_RST 0x10
	41	#define MXC_PLL_DP_CTL_RCP 0x8
	42	#define MXC_PLL_DP_CTL_PLM 0x4
	43	#define MXC_PLL_DP_CTL_BRM0 0x2
	44	#define MXC_PLL_DP_CTL_LRF 0x1
	45
	46	#define MXC_PLL_DP_CONFIG_BIST 0x8
	47	#define MXC_PLL_DP_CONFIG_SJC_CE 0x4
	48	#define MXC_PLL_DP_CONFIG_AREN 0x2
	49	#define MXC_PLL_DP_CONFIG_LDREQ 0x1
	50
	51	#define MXC_PLL_DP_OP_MFI_OFFSET 4
	52	#define MXC_PLL_DP_OP_MFI_MASK (0xF << 4)
	53	#define MXC_PLL_DP_OP_PDF_OFFSET 0
	54	#define MXC_PLL_DP_OP_PDF_MASK 0xF
	55
	56	#define MXC_PLL_DP_MFD_OFFSET 0
	57	#define MXC_PLL_DP_MFD_MASK 0x07FFFFFF
	58
	59	#define MXC_PLL_DP_MFN_OFFSET 0x0
	60	#define MXC_PLL_DP_MFN_MASK 0x07FFFFFF
	61
	62	#define MXC_PLL_DP_MFN_TOGC_TOG_DIS (1 << 17)
	63	#define MXC_PLL_DP_MFN_TOGC_TOG_EN (1 << 16)
	64	#define MXC_PLL_DP_MFN_TOGC_CNT_OFFSET 0x0
65	#define MXC_PLL_DP_MFN_TOGC_CNT_MASK 0xFFFF
66
67	#define MXC_PLL_DP_DESTAT_TOG_SEL (1 << 31)
68	#define MXC_PLL_DP_DESTAT_MFN 0x07FFFFFF
69
70	#define MAX_DPLL_WAIT_TRIES 1000 /* 1000 * udelay(1) = 1ms */
71
72	struct clk_pllv2 {
73	struct clk_hw hw;
74	void __iomem *base;
75	};
76
9ca41bcc SH	77	static unsigned long __clk_pllv2_recalc_rate(unsigned long parent_rate,
9ca41bcc SH	78	u32 dp_ctl, u32 dp_op, u32 dp_mfd, u32 dp_mfn)
a547b816	79	{
53fdc8fd	80	long mfi, mfn, mfd, pdf, ref_clk;
9ca41bcc	81	unsigned long dbl;
0d2681e1	82	u64 temp;
a547b816	83
a547b816 SH	84	dbl = dp_ctl & MXC_PLL_DP_CTL_DPDCK0_2_EN;
a547b816 SH	85
a547b816 SH	86	pdf = dp_op & MXC_PLL_DP_OP_PDF_MASK;
	87	mfi = (dp_op & MXC_PLL_DP_OP_MFI_MASK) >> MXC_PLL_DP_OP_MFI_OFFSET;
	88	mfi = (mfi <= 5) ? 5 : mfi;
	89	mfd = dp_mfd & MXC_PLL_DP_MFD_MASK;
53fdc8fd MK	90	mfn = dp_mfn & MXC_PLL_DP_MFN_MASK;
53fdc8fd MK	91	mfn = sign_extend32(mfn, 26);
a547b816 SH	92
	93	ref_clk = 2 * parent_rate;
	94	if (dbl != 0)
	95	ref_clk *= 2;
	96
	97	ref_clk /= (pdf + 1);
53fdc8fd	98	temp = (u64) ref_clk * abs(mfn);
a547b816 SH	99	do_div(temp, mfd + 1);
a547b816 SH	100	if (mfn < 0)
0d2681e1 NP	101	temp = (ref_clk * mfi) - temp;
	102	else
	103	temp = (ref_clk * mfi) + temp;
a547b816 SH	104
	105	return temp;
	106	}
	107
9ca41bcc	108	static unsigned long clk_pllv2_recalc_rate(struct clk_hw *hw,
a547b816 SH	109	unsigned long parent_rate)
a547b816 SH	110	{
9ca41bcc SH	111	u32 dp_op, dp_mfd, dp_mfn, dp_ctl;
9ca41bcc SH	112	void __iomem *pllbase;
a547b816	113	struct clk_pllv2 *pll = to_clk_pllv2(hw);
9ca41bcc SH	114
	115	pllbase = pll->base;
	116
	117	dp_ctl = __raw_readl(pllbase + MXC_PLL_DP_CTL);
	118	dp_op = __raw_readl(pllbase + MXC_PLL_DP_OP);
	119	dp_mfd = __raw_readl(pllbase + MXC_PLL_DP_MFD);
	120	dp_mfn = __raw_readl(pllbase + MXC_PLL_DP_MFN);
	121
	122	return __clk_pllv2_recalc_rate(parent_rate, dp_ctl, dp_op, dp_mfd, dp_mfn);
	123	}
	124
	125	static int __clk_pllv2_set_rate(unsigned long rate, unsigned long parent_rate,
	126	u32 dp_op, u32 dp_mfd, u32 *dp_mfn)
	127	{
a547b816	128	u32 reg;
a547b816	129	long mfi, pdf, mfn, mfd = 999999;
0d2681e1	130	u64 temp64;
a547b816	131	unsigned long quad_parent_rate;
a547b816 SH	132
	133	quad_parent_rate = 4 * parent_rate;
	134	pdf = mfi = -1;
	135	while (++pdf < 16 && mfi < 5)
	136	mfi = rate * (pdf+1) / quad_parent_rate;
	137	if (mfi > 15)
	138	return -EINVAL;
	139	pdf--;
	140
9ca41bcc SH	141	temp64 = rate * (pdf + 1) - quad_parent_rate * mfi;
9ca41bcc SH	142	do_div(temp64, quad_parent_rate / 1000000);
a547b816 SH	143	mfn = (long)temp64;
a547b816 SH	144
9ca41bcc SH	145	reg = mfi << 4 \| pdf;
	146
	147	*dp_op = reg;
	148	*dp_mfd = mfd;
	149	*dp_mfn = mfn;
	150
	151	return 0;
	152	}
	153
	154	static int clk_pllv2_set_rate(struct clk_hw *hw, unsigned long rate,
	155	unsigned long parent_rate)
	156	{
	157	struct clk_pllv2 *pll = to_clk_pllv2(hw);
	158	void __iomem *pllbase;
	159	u32 dp_ctl, dp_op, dp_mfd, dp_mfn;
	160	int ret;
	161
	162	pllbase = pll->base;
	163
	164
	165	ret = __clk_pllv2_set_rate(rate, parent_rate, &dp_op, &dp_mfd, &dp_mfn);
	166	if (ret)
	167	return ret;
	168
a547b816 SH	169	dp_ctl = __raw_readl(pllbase + MXC_PLL_DP_CTL);
	170	/* use dpdck0_2 */
	171	__raw_writel(dp_ctl \| 0x1000L, pllbase + MXC_PLL_DP_CTL);
6cc90d6d	172
9ca41bcc SH	173	__raw_writel(dp_op, pllbase + MXC_PLL_DP_OP);
	174	__raw_writel(dp_mfd, pllbase + MXC_PLL_DP_MFD);
	175	__raw_writel(dp_mfn, pllbase + MXC_PLL_DP_MFN);
a547b816 SH	176
	177	return 0;
	178	}
	179
	180	static long clk_pllv2_round_rate(struct clk_hw *hw, unsigned long rate,
	181	unsigned long *prate)
	182	{
9ca41bcc SH	183	u32 dp_op, dp_mfd, dp_mfn;
	184
	185	__clk_pllv2_set_rate(rate, *prate, &dp_op, &dp_mfd, &dp_mfn);
	186	return __clk_pllv2_recalc_rate(*prate, MXC_PLL_DP_CTL_DPDCK0_2_EN,
	187	dp_op, dp_mfd, dp_mfn);
a547b816 SH	188	}
	189
	190	static int clk_pllv2_prepare(struct clk_hw *hw)
	191	{
	192	struct clk_pllv2 *pll = to_clk_pllv2(hw);
	193	u32 reg;
	194	void __iomem *pllbase;
	195	int i = 0;
	196
	197	pllbase = pll->base;
	198	reg = __raw_readl(pllbase + MXC_PLL_DP_CTL) \| MXC_PLL_DP_CTL_UPEN;
	199	__raw_writel(reg, pllbase + MXC_PLL_DP_CTL);
	200
	201	/* Wait for lock */
	202	do {
	203	reg = __raw_readl(pllbase + MXC_PLL_DP_CTL);
	204	if (reg & MXC_PLL_DP_CTL_LRF)
	205	break;
	206
	207	udelay(1);
	208	} while (++i < MAX_DPLL_WAIT_TRIES);
	209
	210	if (i == MAX_DPLL_WAIT_TRIES) {
	211	pr_err("MX5: pll locking failed\n");
	212	return -EINVAL;
	213	}
	214
	215	return 0;
	216	}
	217
	218	static void clk_pllv2_unprepare(struct clk_hw *hw)
	219	{
	220	struct clk_pllv2 *pll = to_clk_pllv2(hw);
	221	u32 reg;
	222	void __iomem *pllbase;
	223
	224	pllbase = pll->base;
	225	reg = __raw_readl(pllbase + MXC_PLL_DP_CTL) & ~MXC_PLL_DP_CTL_UPEN;
	226	__raw_writel(reg, pllbase + MXC_PLL_DP_CTL);
	227	}
	228
191f162c	229	static struct clk_ops clk_pllv2_ops = {
a547b816 SH	230	.prepare = clk_pllv2_prepare,
	231	.unprepare = clk_pllv2_unprepare,
	232	.recalc_rate = clk_pllv2_recalc_rate,
	233	.round_rate = clk_pllv2_round_rate,
	234	.set_rate = clk_pllv2_set_rate,
	235	};
	236
	237	struct clk imx_clk_pllv2(const char name, const char *parent,
	238	void __iomem *base)
	239	{
	240	struct clk_pllv2 *pll;
	241	struct clk *clk;
	242	struct clk_init_data init;
	243
	244	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
	245	if (!pll)
	246	return ERR_PTR(-ENOMEM);
	247
	248	pll->base = base;
	249
	250	init.name = name;
	251	init.ops = &clk_pllv2_ops;
	252	init.flags = 0;
	253	init.parent_names = &parent;
	254	init.num_parents = 1;
	255
	256	pll->hw.init = &init;
	257
	258	clk = clk_register(NULL, &pll->hw);
	259	if (IS_ERR(clk))
	260	kfree(pll);
	261
	262	return clk;
	263	}