[linux-block.git] / drivers / clk / clk-nomadik.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Nomadik clock implementation
 * Copyright (C) 2013 ST-Ericsson AB
 * Author: Linus Walleij <linus.walleij@linaro.org>
 */

#define pr_fmt(fmt) "Nomadik SRC clocks: " fmt

#include <linux/bitops.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/clk-provider.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/spinlock.h>
#include <linux/reboot.h>

/*
 * The Nomadik clock tree is described in the STN8815A12 DB V4.2
 * reference manual for the chip, page 94 ff.
 * Clock IDs are in the STn8815 Reference Manual table 3, page 27.
 */

#define SRC_CR			0x00U
#define SRC_CR_T0_ENSEL		BIT(15)
#define SRC_CR_T1_ENSEL		BIT(17)
#define SRC_CR_T2_ENSEL		BIT(19)
#define SRC_CR_T3_ENSEL		BIT(21)
#define SRC_CR_T4_ENSEL		BIT(23)
#define SRC_CR_T5_ENSEL		BIT(25)
#define SRC_CR_T6_ENSEL		BIT(27)
#define SRC_CR_T7_ENSEL		BIT(29)
#define SRC_XTALCR		0x0CU
#define SRC_XTALCR_XTALTIMEN	BIT(20)
#define SRC_XTALCR_SXTALDIS	BIT(19)
#define SRC_XTALCR_MXTALSTAT	BIT(2)
#define SRC_XTALCR_MXTALEN	BIT(1)
#define SRC_XTALCR_MXTALOVER	BIT(0)
#define SRC_PLLCR		0x10U
#define SRC_PLLCR_PLLTIMEN	BIT(29)
#define SRC_PLLCR_PLL2EN	BIT(28)
#define SRC_PLLCR_PLL1STAT	BIT(2)
#define SRC_PLLCR_PLL1EN	BIT(1)
#define SRC_PLLCR_PLL1OVER	BIT(0)
#define SRC_PLLFR		0x14U
#define SRC_PCKEN0		0x24U
#define SRC_PCKDIS0		0x28U
#define SRC_PCKENSR0		0x2CU
#define SRC_PCKSR0		0x30U
#define SRC_PCKEN1		0x34U
#define SRC_PCKDIS1		0x38U
#define SRC_PCKENSR1		0x3CU
#define SRC_PCKSR1		0x40U

/* Lock protecting the SRC_CR register */
static DEFINE_SPINLOCK(src_lock);
/* Base address of the SRC */
static void __iomem *src_base;

static int nomadik_clk_reboot_handler(struct notifier_block *this,
				unsigned long code,
				void *unused)
{
	u32 val;

	/* The main chrystal need to be enabled for reboot to work */
	val = readl(src_base + SRC_XTALCR);
	val &= ~SRC_XTALCR_MXTALOVER;
	val |= SRC_XTALCR_MXTALEN;
	pr_crit("force-enabling MXTALO\n");
	writel(val, src_base + SRC_XTALCR);
	return NOTIFY_OK;
}

static struct notifier_block nomadik_clk_reboot_notifier = {
	.notifier_call = nomadik_clk_reboot_handler,
};

static const struct of_device_id nomadik_src_match[] __initconst = {
	{ .compatible = "stericsson,nomadik-src" },
	{ /* sentinel */ }
};

static void __init nomadik_src_init(void)
{
	struct device_node *np;
	u32 val;

	np = of_find_matching_node(NULL, nomadik_src_match);
	if (!np) {
		pr_crit("no matching node for SRC, aborting clock init\n");
		return;
	}
	src_base = of_iomap(np, 0);
	if (!src_base) {
		pr_err("%s: must have src parent node with REGS (%pOFn)\n",
		       __func__, np);
		goto out_put;
	}

	/* Set all timers to use the 2.4 MHz TIMCLK */
	val = readl(src_base + SRC_CR);
	val |= SRC_CR_T0_ENSEL;
	val |= SRC_CR_T1_ENSEL;
	val |= SRC_CR_T2_ENSEL;
	val |= SRC_CR_T3_ENSEL;
	val |= SRC_CR_T4_ENSEL;
	val |= SRC_CR_T5_ENSEL;
	val |= SRC_CR_T6_ENSEL;
	val |= SRC_CR_T7_ENSEL;
	writel(val, src_base + SRC_CR);

	val = readl(src_base + SRC_XTALCR);
	pr_info("SXTALO is %s\n",
		(val & SRC_XTALCR_SXTALDIS) ? "disabled" : "enabled");
	pr_info("MXTAL is %s\n",
		(val & SRC_XTALCR_MXTALSTAT) ? "enabled" : "disabled");
	if (of_property_read_bool(np, "disable-sxtalo")) {
		/* The machine uses an external oscillator circuit */
		val |= SRC_XTALCR_SXTALDIS;
		pr_info("disabling SXTALO\n");
	}
	if (of_property_read_bool(np, "disable-mxtalo")) {
		/* Disable this too: also run by external oscillator */
		val |= SRC_XTALCR_MXTALOVER;
		val &= ~SRC_XTALCR_MXTALEN;
		pr_info("disabling MXTALO\n");
	}
	writel(val, src_base + SRC_XTALCR);
	register_reboot_notifier(&nomadik_clk_reboot_notifier);

out_put:
	of_node_put(np);
}

/**
 * struct clk_pll - Nomadik PLL clock
 * @hw: corresponding clock hardware entry
 * @id: PLL instance: 1 or 2
 */
struct clk_pll {
	struct clk_hw hw;
	int id;
};

/**
 * struct clk_src - Nomadik src clock
 * @hw: corresponding clock hardware entry
 * @id: the clock ID
 * @group1: true if the clock is in group1, else it is in group0
 * @clkbit: bit 0...31 corresponding to the clock in each clock register
 */
struct clk_src {
	struct clk_hw hw;
	int id;
	bool group1;
	u32 clkbit;
};

#define to_pll(_hw) container_of(_hw, struct clk_pll, hw)
#define to_src(_hw) container_of(_hw, struct clk_src, hw)

static int pll_clk_enable(struct clk_hw *hw)
{
	struct clk_pll *pll = to_pll(hw);
	u32 val;

	spin_lock(&src_lock);
	val = readl(src_base + SRC_PLLCR);
	if (pll->id == 1) {
		if (val & SRC_PLLCR_PLL1OVER) {
			val |= SRC_PLLCR_PLL1EN;
			writel(val, src_base + SRC_PLLCR);
		}
	} else if (pll->id == 2) {
		val |= SRC_PLLCR_PLL2EN;
		writel(val, src_base + SRC_PLLCR);
	}
	spin_unlock(&src_lock);
	return 0;
}

static void pll_clk_disable(struct clk_hw *hw)
{
	struct clk_pll *pll = to_pll(hw);
	u32 val;

	spin_lock(&src_lock);
	val = readl(src_base + SRC_PLLCR);
	if (pll->id == 1) {
		if (val & SRC_PLLCR_PLL1OVER) {
			val &= ~SRC_PLLCR_PLL1EN;
			writel(val, src_base + SRC_PLLCR);
		}
	} else if (pll->id == 2) {
		val &= ~SRC_PLLCR_PLL2EN;
		writel(val, src_base + SRC_PLLCR);
	}
	spin_unlock(&src_lock);
}

static int pll_clk_is_enabled(struct clk_hw *hw)
{
	struct clk_pll *pll = to_pll(hw);
	u32 val;

	val = readl(src_base + SRC_PLLCR);
	if (pll->id == 1) {
		if (val & SRC_PLLCR_PLL1OVER)
			return !!(val & SRC_PLLCR_PLL1EN);
	} else if (pll->id == 2) {
		return !!(val & SRC_PLLCR_PLL2EN);
	}
	return 1;
}

static unsigned long pll_clk_recalc_rate(struct clk_hw *hw,
					  unsigned long parent_rate)
{
	struct clk_pll *pll = to_pll(hw);
	u32 val;

	val = readl(src_base + SRC_PLLFR);

	if (pll->id == 1) {
		u8 mul;
		u8 div;

		mul = (val >> 8) & 0x3FU;
		mul += 2;
		div = val & 0x07U;
		return (parent_rate * mul) >> div;
	}

	if (pll->id == 2) {
		u8 mul;

		mul = (val >> 24) & 0x3FU;
		mul += 2;
		return (parent_rate * mul);
	}

	/* Unknown PLL */
	return 0;
}


static const struct clk_ops pll_clk_ops = {
	.enable = pll_clk_enable,
	.disable = pll_clk_disable,
	.is_enabled = pll_clk_is_enabled,
	.recalc_rate = pll_clk_recalc_rate,
};

static struct clk_hw * __init
pll_clk_register(struct device *dev, const char *name,
		 const char *parent_name, u32 id)
{
	int ret;
	struct clk_pll *pll;
	struct clk_init_data init;

	if (id != 1 && id != 2) {
		pr_err("%s: the Nomadik has only PLL 1 & 2\n", __func__);
		return ERR_PTR(-EINVAL);
	}

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

	init.name = name;
	init.ops = &pll_clk_ops;
	init.parent_names = (parent_name ? &parent_name : NULL);
	init.num_parents = (parent_name ? 1 : 0);
	pll->hw.init = &init;
	pll->id = id;

	pr_debug("register PLL1 clock \"%s\"\n", name);

	ret = clk_hw_register(dev, &pll->hw);
	if (ret) {
		kfree(pll);
		return ERR_PTR(ret);
	}

	return &pll->hw;
}

/*
 * The Nomadik SRC clocks are gated, but not in the sense that
 * you read-modify-write a register. Instead there are separate
 * clock enable and clock disable registers. Writing a '1' bit in
 * the enable register for a certain clock ungates that clock without
 * affecting the other clocks. The disable register works the opposite
 * way.
 */

static int src_clk_enable(struct clk_hw *hw)
{
	struct clk_src *sclk = to_src(hw);
	u32 enreg = sclk->group1 ? SRC_PCKEN1 : SRC_PCKEN0;
	u32 sreg = sclk->group1 ? SRC_PCKSR1 : SRC_PCKSR0;

	writel(sclk->clkbit, src_base + enreg);
	/* spin until enabled */
	while (!(readl(src_base + sreg) & sclk->clkbit))
		cpu_relax();
	return 0;
}

static void src_clk_disable(struct clk_hw *hw)
{
	struct clk_src *sclk = to_src(hw);
	u32 disreg = sclk->group1 ? SRC_PCKDIS1 : SRC_PCKDIS0;
	u32 sreg = sclk->group1 ? SRC_PCKSR1 : SRC_PCKSR0;

	writel(sclk->clkbit, src_base + disreg);
	/* spin until disabled */
	while (readl(src_base + sreg) & sclk->clkbit)
		cpu_relax();
}

static int src_clk_is_enabled(struct clk_hw *hw)
{
	struct clk_src *sclk = to_src(hw);
	u32 sreg = sclk->group1 ? SRC_PCKSR1 : SRC_PCKSR0;
	u32 val = readl(src_base + sreg);

	return !!(val & sclk->clkbit);
}

static unsigned long
src_clk_recalc_rate(struct clk_hw *hw,
		    unsigned long parent_rate)
{
	return parent_rate;
}

static const struct clk_ops src_clk_ops = {
	.enable = src_clk_enable,
	.disable = src_clk_disable,
	.is_enabled = src_clk_is_enabled,
	.recalc_rate = src_clk_recalc_rate,
};

static struct clk_hw * __init
src_clk_register(struct device *dev, const char *name,
		 const char *parent_name, u8 id)
{
	int ret;
	struct clk_src *sclk;
	struct clk_init_data init;

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

	init.name = name;
	init.ops = &src_clk_ops;
	/* Do not force-disable the static SDRAM controller */
	if (id == 2)
		init.flags = CLK_IGNORE_UNUSED;
	else
		init.flags = 0;
	init.parent_names = (parent_name ? &parent_name : NULL);
	init.num_parents = (parent_name ? 1 : 0);
	sclk->hw.init = &init;
	sclk->id = id;
	sclk->group1 = (id > 31);
	sclk->clkbit = BIT(id & 0x1f);

	pr_debug("register clock \"%s\" ID: %d group: %d bits: %08x\n",
		 name, id, sclk->group1, sclk->clkbit);

	ret = clk_hw_register(dev, &sclk->hw);
	if (ret) {
		kfree(sclk);
		return ERR_PTR(ret);
	}

	return &sclk->hw;
}

#ifdef CONFIG_DEBUG_FS

static u32 src_pcksr0_boot;
static u32 src_pcksr1_boot;

static const char * const src_clk_names[] = {
	"HCLKDMA0  ",
	"HCLKSMC   ",
	"HCLKSDRAM ",
	"HCLKDMA1  ",
	"HCLKCLCD  ",
	"PCLKIRDA  ",
	"PCLKSSP   ",
	"PCLKUART0 ",
	"PCLKSDI   ",
	"PCLKI2C0  ",
	"PCLKI2C1  ",
	"PCLKUART1 ",
	"PCLMSP0   ",
	"HCLKUSB   ",
	"HCLKDIF   ",
	"HCLKSAA   ",
	"HCLKSVA   ",
	"PCLKHSI   ",
	"PCLKXTI   ",
	"PCLKUART2 ",
	"PCLKMSP1  ",
	"PCLKMSP2  ",
	"PCLKOWM   ",
	"HCLKHPI   ",
	"PCLKSKE   ",
	"PCLKHSEM  ",
	"HCLK3D    ",
	"HCLKHASH  ",
	"HCLKCRYP  ",
	"PCLKMSHC  ",
	"HCLKUSBM  ",
	"HCLKRNG   ",
	"RESERVED  ",
	"RESERVED  ",
	"RESERVED  ",
	"RESERVED  ",
	"CLDCLK    ",
	"IRDACLK   ",
	"SSPICLK   ",
	"UART0CLK  ",
	"SDICLK    ",
	"I2C0CLK   ",
	"I2C1CLK   ",
	"UART1CLK  ",
	"MSPCLK0   ",
	"USBCLK    ",
	"DIFCLK    ",
	"IPI2CCLK  ",
	"IPBMCCLK  ",
	"HSICLKRX  ",
	"HSICLKTX  ",
	"UART2CLK  ",
	"MSPCLK1   ",
	"MSPCLK2   ",
	"OWMCLK    ",
	"RESERVED  ",
	"SKECLK    ",
	"RESERVED  ",
	"3DCLK     ",
	"PCLKMSP3  ",
	"MSPCLK3   ",
	"MSHCCLK   ",
	"USBMCLK   ",
	"RNGCCLK   ",
};

static int nomadik_src_clk_debugfs_show(struct seq_file *s, void *what)
{
	int i;
	u32 src_pcksr0 = readl(src_base + SRC_PCKSR0);
	u32 src_pcksr1 = readl(src_base + SRC_PCKSR1);
	u32 src_pckensr0 = readl(src_base + SRC_PCKENSR0);
	u32 src_pckensr1 = readl(src_base + SRC_PCKENSR1);

	seq_puts(s, "Clock:      Boot:   Now:    Request: ASKED:\n");
	for (i = 0; i < ARRAY_SIZE(src_clk_names); i++) {
		u32 pcksrb = (i < 0x20) ? src_pcksr0_boot : src_pcksr1_boot;
		u32 pcksr = (i < 0x20) ? src_pcksr0 : src_pcksr1;
		u32 pckreq = (i < 0x20) ? src_pckensr0 : src_pckensr1;
		u32 mask = BIT(i & 0x1f);

		seq_printf(s, "%s  %s     %s     %s\n",
			   src_clk_names[i],
			   (pcksrb & mask) ? "on " : "off",
			   (pcksr & mask) ? "on " : "off",
			   (pckreq & mask) ? "on " : "off");
	}
	return 0;
}

DEFINE_SHOW_ATTRIBUTE(nomadik_src_clk_debugfs);

static int __init nomadik_src_clk_init_debugfs(void)
{
	/* Vital for multiplatform */
	if (!src_base)
		return -ENODEV;
	src_pcksr0_boot = readl(src_base + SRC_PCKSR0);
	src_pcksr1_boot = readl(src_base + SRC_PCKSR1);
	debugfs_create_file("nomadik-src-clk", S_IFREG | S_IRUGO,
			    NULL, NULL, &nomadik_src_clk_debugfs_fops);
	return 0;
}
device_initcall(nomadik_src_clk_init_debugfs);

#endif

static void __init of_nomadik_pll_setup(struct device_node *np)
{
	struct clk_hw *hw;
	const char *clk_name = np->name;
	const char *parent_name;
	u32 pll_id;

	if (!src_base)
		nomadik_src_init();

	if (of_property_read_u32(np, "pll-id", &pll_id)) {
		pr_err("%s: PLL \"%s\" missing pll-id property\n",
			__func__, clk_name);
		return;
	}
	parent_name = of_clk_get_parent_name(np, 0);
	hw = pll_clk_register(NULL, clk_name, parent_name, pll_id);
	if (!IS_ERR(hw))
		of_clk_add_hw_provider(np, of_clk_hw_simple_get, hw);
}
CLK_OF_DECLARE(nomadik_pll_clk,
	"st,nomadik-pll-clock", of_nomadik_pll_setup);

static void __init of_nomadik_hclk_setup(struct device_node *np)
{
	struct clk_hw *hw;
	const char *clk_name = np->name;
	const char *parent_name;

	if (!src_base)
		nomadik_src_init();

	parent_name = of_clk_get_parent_name(np, 0);
	/*
	 * The HCLK divides PLL1 with 1 (passthru), 2, 3 or 4.
	 */
	hw = clk_hw_register_divider(NULL, clk_name, parent_name,
			   0, src_base + SRC_CR,
			   13, 2,
			   CLK_DIVIDER_ONE_BASED | CLK_DIVIDER_ALLOW_ZERO,
			   &src_lock);
	if (!IS_ERR(hw))
		of_clk_add_hw_provider(np, of_clk_hw_simple_get, hw);
}
CLK_OF_DECLARE(nomadik_hclk_clk,
	"st,nomadik-hclk-clock", of_nomadik_hclk_setup);

static void __init of_nomadik_src_clk_setup(struct device_node *np)
{
	struct clk_hw *hw;
	const char *clk_name = np->name;
	const char *parent_name;
	u32 clk_id;

	if (!src_base)
		nomadik_src_init();

	if (of_property_read_u32(np, "clock-id", &clk_id)) {
		pr_err("%s: SRC clock \"%s\" missing clock-id property\n",
			__func__, clk_name);
		return;
	}
	parent_name = of_clk_get_parent_name(np, 0);
	hw = src_clk_register(NULL, clk_name, parent_name, clk_id);
	if (!IS_ERR(hw))
		of_clk_add_hw_provider(np, of_clk_hw_simple_get, hw);
}
CLK_OF_DECLARE(nomadik_src_clk,
	"st,nomadik-src-clock", of_nomadik_src_clk_setup);
Commit	Line	Data
af873fce	1	// SPDX-License-Identifier: GPL-2.0-only
ef6eb322 LW	2	/*
	3	* Nomadik clock implementation
	4	* Copyright (C) 2013 ST-Ericsson AB
ef6eb322 LW	5	* Author: Linus Walleij <linus.walleij@linaro.org>
	6	*/
	7
	8	#define pr_fmt(fmt) "Nomadik SRC clocks: " fmt
	9
	10	#include <linux/bitops.h>
aa1a7fc4	11	#include <linux/slab.h>
4a31bd28 LW	12	#include <linux/err.h>
	13	#include <linux/io.h>
	14	#include <linux/clk-provider.h>
6e2b07a1	15	#include <linux/of.h>
ef6eb322 LW	16	#include <linux/of_address.h>
	17	#include <linux/debugfs.h>
	18	#include <linux/seq_file.h>
	19	#include <linux/spinlock.h>
	20	#include <linux/reboot.h>
4a31bd28 LW	21
	22	/*
	23	* The Nomadik clock tree is described in the STN8815A12 DB V4.2
	24	* reference manual for the chip, page 94 ff.
ef6eb322 LW	25	* Clock IDs are in the STn8815 Reference Manual table 3, page 27.
	26	*/
	27
	28	#define SRC_CR 0x00U
eb6b036d LW	29	#define SRC_CR_T0_ENSEL BIT(15)
	30	#define SRC_CR_T1_ENSEL BIT(17)
	31	#define SRC_CR_T2_ENSEL BIT(19)
	32	#define SRC_CR_T3_ENSEL BIT(21)
	33	#define SRC_CR_T4_ENSEL BIT(23)
	34	#define SRC_CR_T5_ENSEL BIT(25)
	35	#define SRC_CR_T6_ENSEL BIT(27)
	36	#define SRC_CR_T7_ENSEL BIT(29)
ef6eb322 LW	37	#define SRC_XTALCR 0x0CU
	38	#define SRC_XTALCR_XTALTIMEN BIT(20)
	39	#define SRC_XTALCR_SXTALDIS BIT(19)
	40	#define SRC_XTALCR_MXTALSTAT BIT(2)
	41	#define SRC_XTALCR_MXTALEN BIT(1)
	42	#define SRC_XTALCR_MXTALOVER BIT(0)
	43	#define SRC_PLLCR 0x10U
	44	#define SRC_PLLCR_PLLTIMEN BIT(29)
	45	#define SRC_PLLCR_PLL2EN BIT(28)
	46	#define SRC_PLLCR_PLL1STAT BIT(2)
	47	#define SRC_PLLCR_PLL1EN BIT(1)
	48	#define SRC_PLLCR_PLL1OVER BIT(0)
	49	#define SRC_PLLFR 0x14U
	50	#define SRC_PCKEN0 0x24U
	51	#define SRC_PCKDIS0 0x28U
	52	#define SRC_PCKENSR0 0x2CU
	53	#define SRC_PCKSR0 0x30U
	54	#define SRC_PCKEN1 0x34U
	55	#define SRC_PCKDIS1 0x38U
	56	#define SRC_PCKENSR1 0x3CU
	57	#define SRC_PCKSR1 0x40U
	58
	59	/* Lock protecting the SRC_CR register */
	60	static DEFINE_SPINLOCK(src_lock);
	61	/* Base address of the SRC */
	62	static void __iomem *src_base;
	63
ea25a900 SH	64	static int nomadik_clk_reboot_handler(struct notifier_block *this,
	65	unsigned long code,
	66	void *unused)
	67	{
	68	u32 val;
	69
	70	/* The main chrystal need to be enabled for reboot to work */
	71	val = readl(src_base + SRC_XTALCR);
	72	val &= ~SRC_XTALCR_MXTALOVER;
	73	val \|= SRC_XTALCR_MXTALEN;
	74	pr_crit("force-enabling MXTALO\n");
	75	writel(val, src_base + SRC_XTALCR);
	76	return NOTIFY_OK;
	77	}
	78
	79	static struct notifier_block nomadik_clk_reboot_notifier = {
	80	.notifier_call = nomadik_clk_reboot_handler,
	81	};
	82
	83	static const struct of_device_id nomadik_src_match[] __initconst = {
	84	{ .compatible = "stericsson,nomadik-src" },
	85	{ /* sentinel */ }
	86	};
	87
54bf93c4	88	static void __init nomadik_src_init(void)
ea25a900 SH	89	{
	90	struct device_node *np;
	91	u32 val;
	92
	93	np = of_find_matching_node(NULL, nomadik_src_match);
	94	if (!np) {
	95	pr_crit("no matching node for SRC, aborting clock init\n");
	96	return;
	97	}
	98	src_base = of_iomap(np, 0);
	99	if (!src_base) {
e665f029 RH	100	pr_err("%s: must have src parent node with REGS (%pOFn)\n",
e665f029 RH	101	__func__, np);
28a0b098	102	goto out_put;
ea25a900 SH	103	}
	104
	105	/* Set all timers to use the 2.4 MHz TIMCLK */
	106	val = readl(src_base + SRC_CR);
	107	val \|= SRC_CR_T0_ENSEL;
	108	val \|= SRC_CR_T1_ENSEL;
	109	val \|= SRC_CR_T2_ENSEL;
	110	val \|= SRC_CR_T3_ENSEL;
	111	val \|= SRC_CR_T4_ENSEL;
	112	val \|= SRC_CR_T5_ENSEL;
	113	val \|= SRC_CR_T6_ENSEL;
	114	val \|= SRC_CR_T7_ENSEL;
	115	writel(val, src_base + SRC_CR);
	116
	117	val = readl(src_base + SRC_XTALCR);
	118	pr_info("SXTALO is %s\n",
	119	(val & SRC_XTALCR_SXTALDIS) ? "disabled" : "enabled");
	120	pr_info("MXTAL is %s\n",
	121	(val & SRC_XTALCR_MXTALSTAT) ? "enabled" : "disabled");
	122	if (of_property_read_bool(np, "disable-sxtalo")) {
	123	/* The machine uses an external oscillator circuit */
	124	val \|= SRC_XTALCR_SXTALDIS;
	125	pr_info("disabling SXTALO\n");
	126	}
	127	if (of_property_read_bool(np, "disable-mxtalo")) {
	128	/* Disable this too: also run by external oscillator */
	129	val \|= SRC_XTALCR_MXTALOVER;
	130	val &= ~SRC_XTALCR_MXTALEN;
	131	pr_info("disabling MXTALO\n");
	132	}
	133	writel(val, src_base + SRC_XTALCR);
	134	register_reboot_notifier(&nomadik_clk_reboot_notifier);
28a0b098 LH	135
	136	out_put:
	137	of_node_put(np);
ea25a900 SH	138	}
ea25a900 SH	139
ef6eb322	140	/**
5e57aaa8	141	* struct clk_pll - Nomadik PLL clock
ef6eb322 LW	142	* @hw: corresponding clock hardware entry
	143	* @id: PLL instance: 1 or 2
	144	*/
	145	struct clk_pll {
	146	struct clk_hw hw;
	147	int id;
	148	};
	149
	150	/**
	151	* struct clk_src - Nomadik src clock
	152	* @hw: corresponding clock hardware entry
	153	* @id: the clock ID
	154	* @group1: true if the clock is in group1, else it is in group0
	155	* @clkbit: bit 0...31 corresponding to the clock in each clock register
	156	*/
	157	struct clk_src {
	158	struct clk_hw hw;
	159	int id;
	160	bool group1;
	161	u32 clkbit;
	162	};
	163
	164	#define to_pll(_hw) container_of(_hw, struct clk_pll, hw)
	165	#define to_src(_hw) container_of(_hw, struct clk_src, hw)
	166
	167	static int pll_clk_enable(struct clk_hw *hw)
	168	{
	169	struct clk_pll *pll = to_pll(hw);
	170	u32 val;
	171
	172	spin_lock(&src_lock);
	173	val = readl(src_base + SRC_PLLCR);
	174	if (pll->id == 1) {
	175	if (val & SRC_PLLCR_PLL1OVER) {
	176	val \|= SRC_PLLCR_PLL1EN;
	177	writel(val, src_base + SRC_PLLCR);
	178	}
	179	} else if (pll->id == 2) {
	180	val \|= SRC_PLLCR_PLL2EN;
	181	writel(val, src_base + SRC_PLLCR);
	182	}
	183	spin_unlock(&src_lock);
	184	return 0;
	185	}
	186
	187	static void pll_clk_disable(struct clk_hw *hw)
	188	{
	189	struct clk_pll *pll = to_pll(hw);
	190	u32 val;
	191
	192	spin_lock(&src_lock);
	193	val = readl(src_base + SRC_PLLCR);
	194	if (pll->id == 1) {
	195	if (val & SRC_PLLCR_PLL1OVER) {
	196	val &= ~SRC_PLLCR_PLL1EN;
	197	writel(val, src_base + SRC_PLLCR);
	198	}
	199	} else if (pll->id == 2) {
	200	val &= ~SRC_PLLCR_PLL2EN;
	201	writel(val, src_base + SRC_PLLCR);
	202	}
	203	spin_unlock(&src_lock);
	204	}
	205
206	static int pll_clk_is_enabled(struct clk_hw *hw)
207	{
208	struct clk_pll *pll = to_pll(hw);
209	u32 val;
210
211	val = readl(src_base + SRC_PLLCR);
212	if (pll->id == 1) {
213	if (val & SRC_PLLCR_PLL1OVER)
214	return !!(val & SRC_PLLCR_PLL1EN);
215	} else if (pll->id == 2) {
216	return !!(val & SRC_PLLCR_PLL2EN);
217	}
218	return 1;
219	}
220
221	static unsigned long pll_clk_recalc_rate(struct clk_hw *hw,
222	unsigned long parent_rate)
223	{
224	struct clk_pll *pll = to_pll(hw);
225	u32 val;
226
227	val = readl(src_base + SRC_PLLFR);
228
229	if (pll->id == 1) {
230	u8 mul;
231	u8 div;
232
233	mul = (val >> 8) & 0x3FU;
234	mul += 2;
235	div = val & 0x07U;
236	return (parent_rate * mul) >> div;
237	}
238
239	if (pll->id == 2) {
240	u8 mul;
241
242	mul = (val >> 24) & 0x3FU;
243	mul += 2;
244	return (parent_rate * mul);
245	}
246
247	/* Unknown PLL */
248	return 0;
249	}
250
251
252	static const struct clk_ops pll_clk_ops = {
253	.enable = pll_clk_enable,
254	.disable = pll_clk_disable,
255	.is_enabled = pll_clk_is_enabled,
256	.recalc_rate = pll_clk_recalc_rate,
257	};
258
7b38d1b2	259	static struct clk_hw * __init
ef6eb322 LW	260	pll_clk_register(struct device dev, const char name,
	261	const char *parent_name, u32 id)
	262	{
7b38d1b2	263	int ret;
ef6eb322 LW	264	struct clk_pll *pll;
	265	struct clk_init_data init;
	266
	267	if (id != 1 && id != 2) {
	268	pr_err("%s: the Nomadik has only PLL 1 & 2\n", __func__);
	269	return ERR_PTR(-EINVAL);
	270	}
	271
	272	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
24f8186e	273	if (!pll)
ef6eb322	274	return ERR_PTR(-ENOMEM);
ef6eb322 LW	275
	276	init.name = name;
	277	init.ops = &pll_clk_ops;
	278	init.parent_names = (parent_name ? &parent_name : NULL);
	279	init.num_parents = (parent_name ? 1 : 0);
	280	pll->hw.init = &init;
	281	pll->id = id;
	282
	283	pr_debug("register PLL1 clock \"%s\"\n", name);
	284
7b38d1b2 SB	285	ret = clk_hw_register(dev, &pll->hw);
7b38d1b2 SB	286	if (ret) {
ef6eb322	287	kfree(pll);
7b38d1b2 SB	288	return ERR_PTR(ret);
7b38d1b2 SB	289	}
ef6eb322	290
7b38d1b2	291	return &pll->hw;
ef6eb322 LW	292	}
	293
	294	/*
	295	* The Nomadik SRC clocks are gated, but not in the sense that
	296	* you read-modify-write a register. Instead there are separate
	297	* clock enable and clock disable registers. Writing a '1' bit in
	298	* the enable register for a certain clock ungates that clock without
	299	* affecting the other clocks. The disable register works the opposite
	300	* way.
4a31bd28 LW	301	*/
4a31bd28 LW	302
ef6eb322 LW	303	static int src_clk_enable(struct clk_hw *hw)
	304	{
	305	struct clk_src *sclk = to_src(hw);
	306	u32 enreg = sclk->group1 ? SRC_PCKEN1 : SRC_PCKEN0;
	307	u32 sreg = sclk->group1 ? SRC_PCKSR1 : SRC_PCKSR0;
	308
	309	writel(sclk->clkbit, src_base + enreg);
	310	/* spin until enabled */
	311	while (!(readl(src_base + sreg) & sclk->clkbit))
	312	cpu_relax();
	313	return 0;
	314	}
	315
	316	static void src_clk_disable(struct clk_hw *hw)
	317	{
	318	struct clk_src *sclk = to_src(hw);
	319	u32 disreg = sclk->group1 ? SRC_PCKDIS1 : SRC_PCKDIS0;
	320	u32 sreg = sclk->group1 ? SRC_PCKSR1 : SRC_PCKSR0;
	321
	322	writel(sclk->clkbit, src_base + disreg);
	323	/* spin until disabled */
	324	while (readl(src_base + sreg) & sclk->clkbit)
	325	cpu_relax();
	326	}
	327
	328	static int src_clk_is_enabled(struct clk_hw *hw)
	329	{
	330	struct clk_src *sclk = to_src(hw);
	331	u32 sreg = sclk->group1 ? SRC_PCKSR1 : SRC_PCKSR0;
	332	u32 val = readl(src_base + sreg);
	333
	334	return !!(val & sclk->clkbit);
	335	}
	336
	337	static unsigned long
	338	src_clk_recalc_rate(struct clk_hw *hw,
	339	unsigned long parent_rate)
	340	{
	341	return parent_rate;
	342	}
	343
	344	static const struct clk_ops src_clk_ops = {
	345	.enable = src_clk_enable,
	346	.disable = src_clk_disable,
	347	.is_enabled = src_clk_is_enabled,
	348	.recalc_rate = src_clk_recalc_rate,
	349	};
	350
7b38d1b2	351	static struct clk_hw * __init
ef6eb322 LW	352	src_clk_register(struct device dev, const char name,
	353	const char *parent_name, u8 id)
	354	{
7b38d1b2	355	int ret;
ef6eb322 LW	356	struct clk_src *sclk;
	357	struct clk_init_data init;
	358
	359	sclk = kzalloc(sizeof(*sclk), GFP_KERNEL);
24f8186e	360	if (!sclk)
ef6eb322	361	return ERR_PTR(-ENOMEM);
24f8186e	362
ef6eb322 LW	363	init.name = name;
	364	init.ops = &src_clk_ops;
	365	/* Do not force-disable the static SDRAM controller */
	366	if (id == 2)
	367	init.flags = CLK_IGNORE_UNUSED;
	368	else
	369	init.flags = 0;
	370	init.parent_names = (parent_name ? &parent_name : NULL);
	371	init.num_parents = (parent_name ? 1 : 0);
	372	sclk->hw.init = &init;
	373	sclk->id = id;
	374	sclk->group1 = (id > 31);
	375	sclk->clkbit = BIT(id & 0x1f);
	376
	377	pr_debug("register clock \"%s\" ID: %d group: %d bits: %08x\n",
	378	name, id, sclk->group1, sclk->clkbit);
	379
7b38d1b2 SB	380	ret = clk_hw_register(dev, &sclk->hw);
7b38d1b2 SB	381	if (ret) {
ef6eb322	382	kfree(sclk);
7b38d1b2 SB	383	return ERR_PTR(ret);
7b38d1b2 SB	384	}
ef6eb322	385
7b38d1b2	386	return &sclk->hw;
ef6eb322 LW	387	}
	388
	389	#ifdef CONFIG_DEBUG_FS
	390
	391	static u32 src_pcksr0_boot;
	392	static u32 src_pcksr1_boot;
	393
	394	static const char * const src_clk_names[] = {
	395	"HCLKDMA0 ",
	396	"HCLKSMC ",
	397	"HCLKSDRAM ",
	398	"HCLKDMA1 ",
	399	"HCLKCLCD ",
	400	"PCLKIRDA ",
	401	"PCLKSSP ",
	402	"PCLKUART0 ",
	403	"PCLKSDI ",
	404	"PCLKI2C0 ",
	405	"PCLKI2C1 ",
	406	"PCLKUART1 ",
	407	"PCLMSP0 ",
	408	"HCLKUSB ",
	409	"HCLKDIF ",
	410	"HCLKSAA ",
	411	"HCLKSVA ",
	412	"PCLKHSI ",
	413	"PCLKXTI ",
	414	"PCLKUART2 ",
	415	"PCLKMSP1 ",
	416	"PCLKMSP2 ",
	417	"PCLKOWM ",
	418	"HCLKHPI ",
	419	"PCLKSKE ",
	420	"PCLKHSEM ",
	421	"HCLK3D ",
	422	"HCLKHASH ",
	423	"HCLKCRYP ",
	424	"PCLKMSHC ",
	425	"HCLKUSBM ",
	426	"HCLKRNG ",
	427	"RESERVED ",
	428	"RESERVED ",
	429	"RESERVED ",
	430	"RESERVED ",
	431	"CLDCLK ",
	432	"IRDACLK ",
	433	"SSPICLK ",
	434	"UART0CLK ",
	435	"SDICLK ",
	436	"I2C0CLK ",
	437	"I2C1CLK ",
	438	"UART1CLK ",
	439	"MSPCLK0 ",
	440	"USBCLK ",
	441	"DIFCLK ",
	442	"IPI2CCLK ",
	443	"IPBMCCLK ",
	444	"HSICLKRX ",
	445	"HSICLKTX ",
	446	"UART2CLK ",
	447	"MSPCLK1 ",
	448	"MSPCLK2 ",
	449	"OWMCLK ",
	450	"RESERVED ",
451	"SKECLK ",
452	"RESERVED ",
453	"3DCLK ",
454	"PCLKMSP3 ",
455	"MSPCLK3 ",
456	"MSHCCLK ",
457	"USBMCLK ",
458	"RNGCCLK ",
459	};
460
9579346e	461	static int nomadik_src_clk_debugfs_show(struct seq_file s, void what)
ef6eb322 LW	462	{
	463	int i;
	464	u32 src_pcksr0 = readl(src_base + SRC_PCKSR0);
	465	u32 src_pcksr1 = readl(src_base + SRC_PCKSR1);
	466	u32 src_pckensr0 = readl(src_base + SRC_PCKENSR0);
	467	u32 src_pckensr1 = readl(src_base + SRC_PCKENSR1);
	468
add31511	469	seq_puts(s, "Clock: Boot: Now: Request: ASKED:\n");
ef6eb322 LW	470	for (i = 0; i < ARRAY_SIZE(src_clk_names); i++) {
	471	u32 pcksrb = (i < 0x20) ? src_pcksr0_boot : src_pcksr1_boot;
	472	u32 pcksr = (i < 0x20) ? src_pcksr0 : src_pcksr1;
	473	u32 pckreq = (i < 0x20) ? src_pckensr0 : src_pckensr1;
	474	u32 mask = BIT(i & 0x1f);
	475
	476	seq_printf(s, "%s %s %s %s\n",
	477	src_clk_names[i],
	478	(pcksrb & mask) ? "on " : "off",
	479	(pcksr & mask) ? "on " : "off",
	480	(pckreq & mask) ? "on " : "off");
	481	}
	482	return 0;
	483	}
	484
9579346e	485	DEFINE_SHOW_ATTRIBUTE(nomadik_src_clk_debugfs);
ef6eb322 LW	486
	487	static int __init nomadik_src_clk_init_debugfs(void)
	488	{
ec6deea1 LW	489	/* Vital for multiplatform */
	490	if (!src_base)
	491	return -ENODEV;
ef6eb322 LW	492	src_pcksr0_boot = readl(src_base + SRC_PCKSR0);
	493	src_pcksr1_boot = readl(src_base + SRC_PCKSR1);
	494	debugfs_create_file("nomadik-src-clk", S_IFREG \| S_IRUGO,
9579346e	495	NULL, NULL, &nomadik_src_clk_debugfs_fops);
ef6eb322 LW	496	return 0;
ef6eb322 LW	497	}
791ed0bb	498	device_initcall(nomadik_src_clk_init_debugfs);
ef6eb322 LW	499
	500	#endif
	501
	502	static void __init of_nomadik_pll_setup(struct device_node *np)
	503	{
7b38d1b2	504	struct clk_hw *hw;
ef6eb322 LW	505	const char *clk_name = np->name;
	506	const char *parent_name;
	507	u32 pll_id;
	508
74227e65 SH	509	if (!src_base)
	510	nomadik_src_init();
	511
ef6eb322 LW	512	if (of_property_read_u32(np, "pll-id", &pll_id)) {
	513	pr_err("%s: PLL \"%s\" missing pll-id property\n",
	514	__func__, clk_name);
	515	return;
	516	}
	517	parent_name = of_clk_get_parent_name(np, 0);
7b38d1b2 SB	518	hw = pll_clk_register(NULL, clk_name, parent_name, pll_id);
	519	if (!IS_ERR(hw))
	520	of_clk_add_hw_provider(np, of_clk_hw_simple_get, hw);
ef6eb322	521	}
74227e65 SH	522	CLK_OF_DECLARE(nomadik_pll_clk,
74227e65 SH	523	"st,nomadik-pll-clock", of_nomadik_pll_setup);
ef6eb322 LW	524
	525	static void __init of_nomadik_hclk_setup(struct device_node *np)
	526	{
7b38d1b2	527	struct clk_hw *hw;
ef6eb322 LW	528	const char *clk_name = np->name;
	529	const char *parent_name;
	530
74227e65 SH	531	if (!src_base)
	532	nomadik_src_init();
	533
ef6eb322 LW	534	parent_name = of_clk_get_parent_name(np, 0);
	535	/*
	536	* The HCLK divides PLL1 with 1 (passthru), 2, 3 or 4.
	537	*/
7b38d1b2	538	hw = clk_hw_register_divider(NULL, clk_name, parent_name,
ef6eb322 LW	539	0, src_base + SRC_CR,
	540	13, 2,
	541	CLK_DIVIDER_ONE_BASED \| CLK_DIVIDER_ALLOW_ZERO,
	542	&src_lock);
7b38d1b2 SB	543	if (!IS_ERR(hw))
7b38d1b2 SB	544	of_clk_add_hw_provider(np, of_clk_hw_simple_get, hw);
ef6eb322	545	}
74227e65 SH	546	CLK_OF_DECLARE(nomadik_hclk_clk,
74227e65 SH	547	"st,nomadik-hclk-clock", of_nomadik_hclk_setup);
ef6eb322 LW	548
	549	static void __init of_nomadik_src_clk_setup(struct device_node *np)
	550	{
7b38d1b2	551	struct clk_hw *hw;
ef6eb322 LW	552	const char *clk_name = np->name;
	553	const char *parent_name;
	554	u32 clk_id;
	555
74227e65 SH	556	if (!src_base)
	557	nomadik_src_init();
	558
ef6eb322 LW	559	if (of_property_read_u32(np, "clock-id", &clk_id)) {
	560	pr_err("%s: SRC clock \"%s\" missing clock-id property\n",
	561	__func__, clk_name);
	562	return;
	563	}
	564	parent_name = of_clk_get_parent_name(np, 0);
7b38d1b2 SB	565	hw = src_clk_register(NULL, clk_name, parent_name, clk_id);
	566	if (!IS_ERR(hw))
	567	of_clk_add_hw_provider(np, of_clk_hw_simple_get, hw);
ef6eb322	568	}
74227e65 SH	569	CLK_OF_DECLARE(nomadik_src_clk,
74227e65 SH	570	"st,nomadik-src-clock", of_nomadik_src_clk_setup);