diff options
Diffstat (limited to 'arch/arm/cpu/tegra20-common/clock.c')
| -rw-r--r-- | arch/arm/cpu/tegra20-common/clock.c | 605 | 
1 files changed, 20 insertions, 585 deletions
| diff --git a/arch/arm/cpu/tegra20-common/clock.c b/arch/arm/cpu/tegra20-common/clock.c index 12987a689..ec93894f4 100644 --- a/arch/arm/cpu/tegra20-common/clock.c +++ b/arch/arm/cpu/tegra20-common/clock.c @@ -31,24 +31,6 @@  #include <fdtdec.h>  /* - * This is our record of the current clock rate of each clock. We don't - * fill all of these in since we are only really interested in clocks which - * we use as parents. - */ -static unsigned pll_rate[CLOCK_ID_COUNT]; - -/* - * The oscillator frequency is fixed to one of four set values. Based on this - * the other clocks are set up appropriately. - */ -static unsigned osc_freq[CLOCK_OSC_FREQ_COUNT] = { -	13000000, -	19200000, -	12000000, -	26000000, -}; - -/*   * Clock types that we can use as a source. The Tegra20 has muxes for the   * peripheral clocks, and in most cases there are four options for the clock   * source. This gives us a clock 'type' and exploits what commonality exists @@ -76,12 +58,6 @@ enum clock_type_id {  	CLOCK_TYPE_NONE = -1,	/* invalid clock type */  }; -/* return 1 if a peripheral ID is in range */ -#define clock_type_id_isvalid(id) ((id) >= 0 && \ -		(id) < CLOCK_TYPE_COUNT) - -char pllp_valid = 1;	/* PLLP is set up correctly */ -  enum {  	CLOCK_MAX_MUX	= 4	/* number of source options for each clock */  }; @@ -192,10 +168,6 @@ enum periphc_internal_id {  	PERIPHC_NONE = -1,  }; -/* return 1 if a periphc_internal_id is in range */ -#define periphc_internal_id_isvalid(id) ((id) >= 0 && \ -		(id) < PERIPHC_COUNT) -  /*   * Clock type for each peripheral clock source. We put the name in each   * record just so it is easy to match things up @@ -396,19 +368,9 @@ static s8 periph_id_to_internal_id[PERIPH_ID_COUNT] = {  	NONE(CRAM2),  }; -/* number of clock outputs of a PLL */ -static const u8 pll_num_clkouts[] = { -	1,	/* PLLC */ -	1,	/* PLLM */ -	4,	/* PLLP */ -	1,	/* PLLA */ -	0,	/* PLLU */ -	0,	/* PLLD */ -}; -  /*   * Get the oscillator frequency, from the corresponding hardware configuration - * field. + * field. T20 has 4 frequencies that it supports.   */  enum clock_osc_freq clock_get_osc_freq(void)  { @@ -420,110 +382,8 @@ enum clock_osc_freq clock_get_osc_freq(void)  	return (reg & OSC_FREQ_MASK) >> OSC_FREQ_SHIFT;  } -int clock_get_osc_bypass(void) -{ -	struct clk_rst_ctlr *clkrst = -			(struct clk_rst_ctlr *)NV_PA_CLK_RST_BASE; -	u32 reg; - -	reg = readl(&clkrst->crc_osc_ctrl); -	return (reg & OSC_XOBP_MASK) >> OSC_XOBP_SHIFT; -} - -/* Returns a pointer to the registers of the given pll */ -static struct clk_pll *get_pll(enum clock_id clkid) -{ -	struct clk_rst_ctlr *clkrst = -			(struct clk_rst_ctlr *)NV_PA_CLK_RST_BASE; - -	assert(clock_id_is_pll(clkid)); -	return &clkrst->crc_pll[clkid]; -} - -int clock_ll_read_pll(enum clock_id clkid, u32 *divm, u32 *divn, -		u32 *divp, u32 *cpcon, u32 *lfcon) -{ -	struct clk_pll *pll = get_pll(clkid); -	u32 data; - -	assert(clkid != CLOCK_ID_USB); - -	/* Safety check, adds to code size but is small */ -	if (!clock_id_is_pll(clkid) || clkid == CLOCK_ID_USB) -		return -1; -	data = readl(&pll->pll_base); -	*divm = (data & PLL_DIVM_MASK) >> PLL_DIVM_SHIFT; -	*divn = (data & PLL_DIVN_MASK) >> PLL_DIVN_SHIFT; -	*divp = (data & PLL_DIVP_MASK) >> PLL_DIVP_SHIFT; -	data = readl(&pll->pll_misc); -	*cpcon = (data & PLL_CPCON_MASK) >> PLL_CPCON_SHIFT; -	*lfcon = (data & PLL_LFCON_MASK) >> PLL_LFCON_SHIFT; - -	return 0; -} - -unsigned long clock_start_pll(enum clock_id clkid, u32 divm, u32 divn, -		u32 divp, u32 cpcon, u32 lfcon) -{ -	struct clk_pll *pll = get_pll(clkid); -	u32 data; - -	/* -	 * We cheat by treating all PLL (except PLLU) in the same fashion. -	 * This works only because: -	 * - same fields are always mapped at same offsets, except DCCON -	 * - DCCON is always 0, doesn't conflict -	 * - M,N, P of PLLP values are ignored for PLLP -	 */ -	data = (cpcon << PLL_CPCON_SHIFT) | (lfcon << PLL_LFCON_SHIFT); -	writel(data, &pll->pll_misc); - -	data = (divm << PLL_DIVM_SHIFT) | (divn << PLL_DIVN_SHIFT) | -			(0 << PLL_BYPASS_SHIFT) | (1 << PLL_ENABLE_SHIFT); - -	if (clkid == CLOCK_ID_USB) -		data |= divp << PLLU_VCO_FREQ_SHIFT; -	else -		data |= divp << PLL_DIVP_SHIFT; -	writel(data, &pll->pll_base); - -	/* calculate the stable time */ -	return timer_get_us() + CLOCK_PLL_STABLE_DELAY_US; -} - -/* return 1 if a peripheral ID is in range and valid */ -static int clock_periph_id_isvalid(enum periph_id id) -{ -	if (id < PERIPH_ID_FIRST || id >= PERIPH_ID_COUNT) -		printf("Peripheral id %d out of range\n", id); -	else { -		switch (id) { -		case PERIPH_ID_RESERVED1: -		case PERIPH_ID_RESERVED2: -		case PERIPH_ID_RESERVED30: -		case PERIPH_ID_RESERVED35: -		case PERIPH_ID_RESERVED56: -		case PERIPH_ID_RESERVED74: -		case PERIPH_ID_RESERVED76: -		case PERIPH_ID_RESERVED77: -		case PERIPH_ID_RESERVED78: -		case PERIPH_ID_RESERVED79: -		case PERIPH_ID_RESERVED80: -		case PERIPH_ID_RESERVED81: -		case PERIPH_ID_RESERVED82: -		case PERIPH_ID_RESERVED83: -		case PERIPH_ID_RESERVED91: -			printf("Peripheral id %d is reserved\n", id); -			break; -		default: -			return 1; -		} -	} -	return 0; -} -  /* Returns a pointer to the clock source register for a peripheral */ -static u32 *get_periph_source_reg(enum periph_id periph_id) +u32 *get_periph_source_reg(enum periph_id periph_id)  {  	struct clk_rst_ctlr *clkrst =  			(struct clk_rst_ctlr *)NV_PA_CLK_RST_BASE; @@ -535,154 +395,6 @@ static u32 *get_periph_source_reg(enum periph_id periph_id)  	return &clkrst->crc_clk_src[internal_id];  } -void clock_ll_set_source_divisor(enum periph_id periph_id, unsigned source, -			      unsigned divisor) -{ -	u32 *reg = get_periph_source_reg(periph_id); -	u32 value; - -	value = readl(reg); - -	value &= ~OUT_CLK_SOURCE_MASK; -	value |= source << OUT_CLK_SOURCE_SHIFT; - -	value &= ~OUT_CLK_DIVISOR_MASK; -	value |= divisor << OUT_CLK_DIVISOR_SHIFT; - -	writel(value, reg); -} - -void clock_ll_set_source(enum periph_id periph_id, unsigned source) -{ -	u32 *reg = get_periph_source_reg(periph_id); - -	clrsetbits_le32(reg, OUT_CLK_SOURCE_MASK, -			source << OUT_CLK_SOURCE_SHIFT); -} - -/** - * Given the parent's rate and the required rate for the children, this works - * out the peripheral clock divider to use, in 7.1 binary format. - * - * @param divider_bits	number of divider bits (8 or 16) - * @param parent_rate	clock rate of parent clock in Hz - * @param rate		required clock rate for this clock - * @return divider which should be used - */ -static int clk_get_divider(unsigned divider_bits, unsigned long parent_rate, -			   unsigned long rate) -{ -	u64 divider = parent_rate * 2; -	unsigned max_divider = 1 << divider_bits; - -	divider += rate - 1; -	do_div(divider, rate); - -	if ((s64)divider - 2 < 0) -		return 0; - -	if ((s64)divider - 2 >= max_divider) -		return -1; - -	return divider - 2; -} - -/** - * Given the parent's rate and the divider in 7.1 format, this works out the - * resulting peripheral clock rate. - * - * @param parent_rate	clock rate of parent clock in Hz - * @param divider which should be used in 7.1 format - * @return effective clock rate of peripheral - */ -static unsigned long get_rate_from_divider(unsigned long parent_rate, -					   int divider) -{ -	u64 rate; - -	rate = (u64)parent_rate * 2; -	do_div(rate, divider + 2); -	return rate; -} - -unsigned long clock_get_periph_rate(enum periph_id periph_id, -		enum clock_id parent) -{ -	u32 *reg = get_periph_source_reg(periph_id); - -	return get_rate_from_divider(pll_rate[parent], -		(readl(reg) & OUT_CLK_DIVISOR_MASK) >> OUT_CLK_DIVISOR_SHIFT); -} - -int clock_set_pllout(enum clock_id clkid, enum pll_out_id pllout, unsigned rate) -{ -	struct clk_pll *pll = get_pll(clkid); -	int data = 0, div = 0, offset = 0; - -	if (!clock_id_is_pll(clkid)) -		return -1; - -	if (pllout + 1 > pll_num_clkouts[clkid]) -		return -1; - -	div = clk_get_divider(8, pll_rate[clkid], rate); - -	if (div < 0) -		return -1; - -	/* out2 and out4 are in the high part of the register */ -	if (pllout == PLL_OUT2 || pllout == PLL_OUT4) -		offset = 16; - -	data = (div << PLL_OUT_RATIO_SHIFT) | -			PLL_OUT_OVRRIDE | PLL_OUT_CLKEN | PLL_OUT_RSTN; -	clrsetbits_le32(&pll->pll_out[pllout >> 1], -			PLL_OUT_RATIO_MASK << offset, data << offset); - -	return 0; -} - -/** - * Find the best available 7.1 format divisor given a parent clock rate and - * required child clock rate. This function assumes that a second-stage - * divisor is available which can divide by powers of 2 from 1 to 256. - * - * @param divider_bits	number of divider bits (8 or 16) - * @param parent_rate	clock rate of parent clock in Hz - * @param rate		required clock rate for this clock - * @param extra_div	value for the second-stage divisor (not set if this - *			function returns -1. - * @return divider which should be used, or -1 if nothing is valid - * - */ -static int find_best_divider(unsigned divider_bits, unsigned long parent_rate, -			     unsigned long rate, int *extra_div) -{ -	int shift; -	int best_divider = -1; -	int best_error = rate; - -	/* try dividers from 1 to 256 and find closest match */ -	for (shift = 0; shift <= 8 && best_error > 0; shift++) { -		unsigned divided_parent = parent_rate >> shift; -		int divider = clk_get_divider(divider_bits, divided_parent, -					      rate); -		unsigned effective_rate = get_rate_from_divider(divided_parent, -						       divider); -		int error = rate - effective_rate; - -		/* Given a valid divider, look for the lowest error */ -		if (divider != -1 && error < best_error) { -			best_error = error; -			*extra_div = 1 << shift; -			best_divider = divider; -		} -	} - -	/* return what we found - *extra_div will already be set */ -	return best_divider; -} -  /**   * Given a peripheral ID and the required source clock, this returns which   * value should be programmed into the source mux for that peripheral. @@ -695,7 +407,7 @@ static int find_best_divider(unsigned divider_bits, unsigned long parent_rate,   * @param divider_bits	Set to number of divider bits (8 or 16)   * @return mux value (0-4, or -1 if not found)   */ -static int get_periph_clock_source(enum periph_id periph_id, +int get_periph_clock_source(enum periph_id periph_id,  		enum clock_id parent, int *mux_bits, int *divider_bits)  {  	enum clock_type_id type; @@ -743,88 +455,6 @@ static int get_periph_clock_source(enum periph_id periph_id,  	return -1;  } -/** - * Adjust peripheral PLL to use the given divider and source. - * - * @param periph_id	peripheral to adjust - * @param source	Source number (0-3 or 0-7) - * @param mux_bits	Number of mux bits (2 or 4) - * @param divider	Required divider in 7.1 or 15.1 format - * @return 0 if ok, -1 on error (requesting a parent clock which is not valid - *		for this peripheral) - */ -static int adjust_periph_pll(enum periph_id periph_id, int source, -			     int mux_bits, unsigned divider) -{ -	u32 *reg = get_periph_source_reg(periph_id); - -	clrsetbits_le32(reg, OUT_CLK_DIVISOR_MASK, -			divider << OUT_CLK_DIVISOR_SHIFT); -	udelay(1); - -	/* work out the source clock and set it */ -	if (source < 0) -		return -1; -	if (mux_bits == 4) { -		clrsetbits_le32(reg, OUT_CLK_SOURCE4_MASK, -			source << OUT_CLK_SOURCE4_SHIFT); -	} else { -		clrsetbits_le32(reg, OUT_CLK_SOURCE_MASK, -			source << OUT_CLK_SOURCE_SHIFT); -	} -	udelay(2); -	return 0; -} - -unsigned clock_adjust_periph_pll_div(enum periph_id periph_id, -		enum clock_id parent, unsigned rate, int *extra_div) -{ -	unsigned effective_rate; -	int mux_bits, divider_bits, source; -	int divider; - -	/* work out the source clock and set it */ -	source = get_periph_clock_source(periph_id, parent, &mux_bits, -					 ÷r_bits); - -	if (extra_div) -		divider = find_best_divider(divider_bits, pll_rate[parent], -					    rate, extra_div); -	else -		divider = clk_get_divider(divider_bits, pll_rate[parent], -					  rate); -	assert(divider >= 0); -	if (adjust_periph_pll(periph_id, source, mux_bits, divider)) -		return -1U; -	debug("periph %d, rate=%d, reg=%p = %x\n", periph_id, rate, -		get_periph_source_reg(periph_id), -		readl(get_periph_source_reg(periph_id))); - -	/* Check what we ended up with. This shouldn't matter though */ -	effective_rate = clock_get_periph_rate(periph_id, parent); -	if (extra_div) -		effective_rate /= *extra_div; -	if (rate != effective_rate) -		debug("Requested clock rate %u not honored (got %u)\n", -		       rate, effective_rate); -	return effective_rate; -} - -unsigned clock_start_periph_pll(enum periph_id periph_id, -		enum clock_id parent, unsigned rate) -{ -	unsigned effective_rate; - -	reset_set_enable(periph_id, 1); -	clock_enable(periph_id); - -	effective_rate = clock_adjust_periph_pll_div(periph_id, parent, rate, -						 NULL); - -	reset_set_enable(periph_id, 0); -	return effective_rate; -} -  void clock_set_enable(enum periph_id periph_id, int enable)  {  	struct clk_rst_ctlr *clkrst = @@ -842,16 +472,6 @@ void clock_set_enable(enum periph_id periph_id, int enable)  	writel(reg, clk);  } -void clock_enable(enum periph_id clkid) -{ -	clock_set_enable(clkid, 1); -} - -void clock_disable(enum periph_id clkid) -{ -	clock_set_enable(clkid, 0); -} -  void reset_set_enable(enum periph_id periph_id, int enable)  {  	struct clk_rst_ctlr *clkrst = @@ -869,146 +489,6 @@ void reset_set_enable(enum periph_id periph_id, int enable)  	writel(reg, reset);  } -void reset_periph(enum periph_id periph_id, int us_delay) -{ -	/* Put peripheral into reset */ -	reset_set_enable(periph_id, 1); -	udelay(us_delay); - -	/* Remove reset */ -	reset_set_enable(periph_id, 0); - -	udelay(us_delay); -} - -void reset_cmplx_set_enable(int cpu, int which, int reset) -{ -	struct clk_rst_ctlr *clkrst = -			(struct clk_rst_ctlr *)NV_PA_CLK_RST_BASE; -	u32 mask; - -	/* Form the mask, which depends on the cpu chosen. Tegra20 has 2 */ -	assert(cpu >= 0 && cpu < 2); -	mask = which << cpu; - -	/* either enable or disable those reset for that CPU */ -	if (reset) -		writel(mask, &clkrst->crc_cpu_cmplx_set); -	else -		writel(mask, &clkrst->crc_cpu_cmplx_clr); -} - -unsigned clock_get_rate(enum clock_id clkid) -{ -	struct clk_pll *pll; -	u32 base; -	u32 divm; -	u64 parent_rate; -	u64 rate; - -	parent_rate = osc_freq[clock_get_osc_freq()]; -	if (clkid == CLOCK_ID_OSC) -		return parent_rate; - -	pll = get_pll(clkid); -	base = readl(&pll->pll_base); - -	/* Oh for bf_unpack()... */ -	rate = parent_rate * ((base & PLL_DIVN_MASK) >> PLL_DIVN_SHIFT); -	divm = (base & PLL_DIVM_MASK) >> PLL_DIVM_SHIFT; -	if (clkid == CLOCK_ID_USB) -		divm <<= (base & PLLU_VCO_FREQ_MASK) >> PLLU_VCO_FREQ_SHIFT; -	else -		divm <<= (base & PLL_DIVP_MASK) >> PLL_DIVP_SHIFT; -	do_div(rate, divm); -	return rate; -} - -/** - * Set the output frequency you want for each PLL clock. - * PLL output frequencies are programmed by setting their N, M and P values. - * The governing equations are: - *     VCO = (Fi / m) * n, Fo = VCO / (2^p) - *     where Fo is the output frequency from the PLL. - * Example: Set the output frequency to 216Mhz(Fo) with 12Mhz OSC(Fi) - *     216Mhz = ((12Mhz / m) * n) / (2^p) so n=432,m=12,p=1 - * Please see Tegra TRM section 5.3 to get the detail for PLL Programming - * - * @param n PLL feedback divider(DIVN) - * @param m PLL input divider(DIVN) - * @param p post divider(DIVP) - * @param cpcon base PLL charge pump(CPCON) - * @return 0 if ok, -1 on error (the requested PLL is incorrect and cannot - *		be overriden), 1 if PLL is already correct - */ -static int clock_set_rate(enum clock_id clkid, u32 n, u32 m, u32 p, u32 cpcon) -{ -	u32 base_reg; -	u32 misc_reg; -	struct clk_pll *pll; - -	pll = get_pll(clkid); - -	base_reg = readl(&pll->pll_base); - -	/* Set BYPASS, m, n and p to PLL_BASE */ -	base_reg &= ~PLL_DIVM_MASK; -	base_reg |= m << PLL_DIVM_SHIFT; - -	base_reg &= ~PLL_DIVN_MASK; -	base_reg |= n << PLL_DIVN_SHIFT; - -	base_reg &= ~PLL_DIVP_MASK; -	base_reg |= p << PLL_DIVP_SHIFT; - -	if (clkid == CLOCK_ID_PERIPH) { -		/* -		 * If the PLL is already set up, check that it is correct -		 * and record this info for clock_verify() to check. -		 */ -		if (base_reg & PLL_BASE_OVRRIDE_MASK) { -			base_reg |= PLL_ENABLE_MASK; -			if (base_reg != readl(&pll->pll_base)) -				pllp_valid = 0; -			return pllp_valid ? 1 : -1; -		} -		base_reg |= PLL_BASE_OVRRIDE_MASK; -	} - -	base_reg |= PLL_BYPASS_MASK; -	writel(base_reg, &pll->pll_base); - -	/* Set cpcon to PLL_MISC */ -	misc_reg = readl(&pll->pll_misc); -	misc_reg &= ~PLL_CPCON_MASK; -	misc_reg |= cpcon << PLL_CPCON_SHIFT; -	writel(misc_reg, &pll->pll_misc); - -	/* Enable PLL */ -	base_reg |= PLL_ENABLE_MASK; -	writel(base_reg, &pll->pll_base); - -	/* Disable BYPASS */ -	base_reg &= ~PLL_BYPASS_MASK; -	writel(base_reg, &pll->pll_base); - -	return 0; -} - -void clock_ll_start_uart(enum periph_id periph_id) -{ -	/* Assert UART reset and enable clock */ -	reset_set_enable(periph_id, 1); -	clock_enable(periph_id); -	clock_ll_set_source(periph_id, 0); /* UARTx_CLK_SRC = 00, PLLP_OUT0 */ - -	/* wait for 2us */ -	udelay(2); - -	/* De-assert reset to UART */ -	reset_set_enable(periph_id, 0); -} -  #ifdef CONFIG_OF_CONTROL  /*   * Convert a device tree clock ID to our peripheral ID. They are mostly @@ -1018,67 +498,34 @@ void clock_ll_start_uart(enum periph_id periph_id)   * @param clk_id	Clock ID according to tegra20 device tree binding   * @return peripheral ID, or PERIPH_ID_NONE if the clock ID is invalid   */ -static enum periph_id clk_id_to_periph_id(int clk_id) +enum periph_id clk_id_to_periph_id(int clk_id)  { -	if (clk_id > 95) +	if (clk_id > PERIPH_ID_COUNT)  		return PERIPH_ID_NONE;  	switch (clk_id) { -	case 1: -	case 2: -	case 7: -	case 10: -	case 20: -	case 30: -	case 35: -	case 49: -	case 56: -	case 74: -	case 76: -	case 77: -	case 78: -	case 79: -	case 80: -	case 81: -	case 82: -	case 83: -	case 91: -	case 95: +	case PERIPH_ID_RESERVED1: +	case PERIPH_ID_RESERVED2: +	case PERIPH_ID_RESERVED30: +	case PERIPH_ID_RESERVED35: +	case PERIPH_ID_RESERVED56: +	case PERIPH_ID_RESERVED74: +	case PERIPH_ID_RESERVED76: +	case PERIPH_ID_RESERVED77: +	case PERIPH_ID_RESERVED78: +	case PERIPH_ID_RESERVED79: +	case PERIPH_ID_RESERVED80: +	case PERIPH_ID_RESERVED81: +	case PERIPH_ID_RESERVED82: +	case PERIPH_ID_RESERVED83: +	case PERIPH_ID_RESERVED91:  		return PERIPH_ID_NONE;  	default:  		return clk_id;  	}  } - -int clock_decode_periph_id(const void *blob, int node) -{ -	enum periph_id id; -	u32 cell[2]; -	int err; - -	err = fdtdec_get_int_array(blob, node, "clocks", cell, -				   ARRAY_SIZE(cell)); -	if (err) -		return -1; -	id = clk_id_to_periph_id(cell[1]); -	assert(clock_periph_id_isvalid(id)); -	return id; -}  #endif /* CONFIG_OF_CONTROL */ -int clock_verify(void) -{ -	struct clk_pll *pll = get_pll(CLOCK_ID_PERIPH); -	u32 reg = readl(&pll->pll_base); - -	if (!pllp_valid) { -		printf("Warning: PLLP %x is not correct\n", reg); -		return -1; -	} -	debug("PLLX %x is correct\n", reg); -	return 0; -} -  void clock_early_init(void)  {  	/* @@ -1112,15 +559,3 @@ void clock_early_init(void)  		break;  	}  } - -void clock_init(void) -{ -	pll_rate[CLOCK_ID_MEMORY] = clock_get_rate(CLOCK_ID_MEMORY); -	pll_rate[CLOCK_ID_PERIPH] = clock_get_rate(CLOCK_ID_PERIPH); -	pll_rate[CLOCK_ID_CGENERAL] = clock_get_rate(CLOCK_ID_CGENERAL); -	pll_rate[CLOCK_ID_OSC] = clock_get_rate(CLOCK_ID_OSC); -	pll_rate[CLOCK_ID_SFROM32KHZ] = 32768; -	debug("Osc = %d\n", pll_rate[CLOCK_ID_OSC]); -	debug("PLLM = %d\n", pll_rate[CLOCK_ID_MEMORY]); -	debug("PLLP = %d\n", pll_rate[CLOCK_ID_PERIPH]); -} |