/*
* Copyright (c) 2011 The Chromium OS Authors.
- * See file CREDITS for list of people who contributed to this
- * project.
*
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License, or (at your option) any later version.
- *
- * 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.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
- * MA 02111-1307 USA
+ * SPDX-License-Identifier: GPL-2.0+
*/
/* Tegra20 Clock control functions */
#include <div64.h>
#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
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 */
};
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
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)
{
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;
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.
* @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;
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 =
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 =
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
* @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)
{
/*
}
}
-void clock_init(void)
+void arch_timer_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]);
}
projects / karo-tx-uboot.git / blobdiff