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https://github.com/brain-hackers/u-boot-brain
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![Thierry Reding](/assets/img/avatar_default.png)
Some devices may restrict access to the PMC to TrustZone software only. Non-TZ software can detect this and use SMC calls to the firmware that runs in the TrustZone to perform accesses to PMC registers. Note that this also fixes reset_cpu() and the enterrcm command on Tegra186 where they were previously trying to access the PMC at a wrong physical address. Based on work by Kalyani Chidambaram <kalyanic@nvidia.com> and Tom Warren <twarren@nvidia.com>. Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Tom Warren <twarren@nvidia.com>
840 lines
22 KiB
C
840 lines
22 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2010-2019, NVIDIA CORPORATION. All rights reserved.
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*/
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/* Tegra SoC common clock control functions */
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#include <common.h>
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#include <div64.h>
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#include <dm.h>
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#include <errno.h>
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#include <asm/io.h>
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#include <asm/arch/clock.h>
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#include <asm/arch/tegra.h>
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#include <asm/arch-tegra/ap.h>
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#include <asm/arch-tegra/clk_rst.h>
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#include <asm/arch-tegra/pmc.h>
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#include <asm/arch-tegra/timer.h>
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/*
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* This is our record of the current clock rate of each clock. We don't
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* fill all of these in since we are only really interested in clocks which
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* we use as parents.
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*/
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static unsigned pll_rate[CLOCK_ID_COUNT];
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/*
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* The oscillator frequency is fixed to one of four set values. Based on this
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* the other clocks are set up appropriately.
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*/
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static unsigned osc_freq[CLOCK_OSC_FREQ_COUNT] = {
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13000000,
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19200000,
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12000000,
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26000000,
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38400000,
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48000000,
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};
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/* return 1 if a peripheral ID is in range */
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#define clock_type_id_isvalid(id) ((id) >= 0 && \
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(id) < CLOCK_TYPE_COUNT)
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char pllp_valid = 1; /* PLLP is set up correctly */
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/* return 1 if a periphc_internal_id is in range */
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#define periphc_internal_id_isvalid(id) ((id) >= 0 && \
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(id) < PERIPHC_COUNT)
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/* number of clock outputs of a PLL */
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static const u8 pll_num_clkouts[] = {
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1, /* PLLC */
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1, /* PLLM */
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4, /* PLLP */
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1, /* PLLA */
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0, /* PLLU */
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0, /* PLLD */
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};
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int clock_get_osc_bypass(void)
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{
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struct clk_rst_ctlr *clkrst =
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(struct clk_rst_ctlr *)NV_PA_CLK_RST_BASE;
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u32 reg;
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reg = readl(&clkrst->crc_osc_ctrl);
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return (reg & OSC_XOBP_MASK) >> OSC_XOBP_SHIFT;
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}
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/* Returns a pointer to the registers of the given pll */
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static struct clk_pll *get_pll(enum clock_id clkid)
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{
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struct clk_rst_ctlr *clkrst =
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(struct clk_rst_ctlr *)NV_PA_CLK_RST_BASE;
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assert(clock_id_is_pll(clkid));
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if (clkid >= (enum clock_id)TEGRA_CLK_PLLS) {
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debug("%s: Invalid PLL %d\n", __func__, clkid);
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return NULL;
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}
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return &clkrst->crc_pll[clkid];
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}
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__weak struct clk_pll_simple *clock_get_simple_pll(enum clock_id clkid)
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{
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return NULL;
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}
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int clock_ll_read_pll(enum clock_id clkid, u32 *divm, u32 *divn,
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u32 *divp, u32 *cpcon, u32 *lfcon)
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{
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struct clk_pll *pll = get_pll(clkid);
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struct clk_pll_info *pllinfo = &tegra_pll_info_table[clkid];
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u32 data;
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assert(clkid != CLOCK_ID_USB);
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/* Safety check, adds to code size but is small */
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if (!clock_id_is_pll(clkid) || clkid == CLOCK_ID_USB)
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return -1;
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data = readl(&pll->pll_base);
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*divm = (data >> pllinfo->m_shift) & pllinfo->m_mask;
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*divn = (data >> pllinfo->n_shift) & pllinfo->n_mask;
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*divp = (data >> pllinfo->p_shift) & pllinfo->p_mask;
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data = readl(&pll->pll_misc);
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/* NOTE: On T210, cpcon/lfcon no longer exist, moved to KCP/KVCO */
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*cpcon = (data >> pllinfo->kcp_shift) & pllinfo->kcp_mask;
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*lfcon = (data >> pllinfo->kvco_shift) & pllinfo->kvco_mask;
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return 0;
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}
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unsigned long clock_start_pll(enum clock_id clkid, u32 divm, u32 divn,
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u32 divp, u32 cpcon, u32 lfcon)
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{
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struct clk_pll *pll = NULL;
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struct clk_pll_info *pllinfo = &tegra_pll_info_table[clkid];
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struct clk_pll_simple *simple_pll = NULL;
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u32 misc_data, data;
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if (clkid < (enum clock_id)TEGRA_CLK_PLLS) {
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pll = get_pll(clkid);
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} else {
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simple_pll = clock_get_simple_pll(clkid);
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if (!simple_pll) {
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debug("%s: Uknown simple PLL %d\n", __func__, clkid);
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return 0;
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}
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}
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/*
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* pllinfo has the m/n/p and kcp/kvco mask and shift
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* values for all of the PLLs used in U-Boot, with any
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* SoC differences accounted for.
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*
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* Preserve EN_LOCKDET, etc.
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*/
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if (pll)
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misc_data = readl(&pll->pll_misc);
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else
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misc_data = readl(&simple_pll->pll_misc);
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misc_data &= ~(pllinfo->kcp_mask << pllinfo->kcp_shift);
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misc_data |= cpcon << pllinfo->kcp_shift;
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misc_data &= ~(pllinfo->kvco_mask << pllinfo->kvco_shift);
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misc_data |= lfcon << pllinfo->kvco_shift;
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data = (divm << pllinfo->m_shift) | (divn << pllinfo->n_shift);
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data |= divp << pllinfo->p_shift;
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data |= (1 << PLL_ENABLE_SHIFT); /* BYPASS s/b 0 already */
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if (pll) {
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writel(misc_data, &pll->pll_misc);
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writel(data, &pll->pll_base);
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} else {
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writel(misc_data, &simple_pll->pll_misc);
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writel(data, &simple_pll->pll_base);
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}
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/* calculate the stable time */
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return timer_get_us() + CLOCK_PLL_STABLE_DELAY_US;
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}
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void clock_ll_set_source_divisor(enum periph_id periph_id, unsigned source,
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unsigned divisor)
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{
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u32 *reg = get_periph_source_reg(periph_id);
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u32 value;
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value = readl(reg);
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value &= ~OUT_CLK_SOURCE_31_30_MASK;
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value |= source << OUT_CLK_SOURCE_31_30_SHIFT;
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value &= ~OUT_CLK_DIVISOR_MASK;
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value |= divisor << OUT_CLK_DIVISOR_SHIFT;
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writel(value, reg);
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}
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int clock_ll_set_source_bits(enum periph_id periph_id, int mux_bits,
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unsigned source)
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{
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u32 *reg = get_periph_source_reg(periph_id);
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switch (mux_bits) {
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case MASK_BITS_31_30:
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clrsetbits_le32(reg, OUT_CLK_SOURCE_31_30_MASK,
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source << OUT_CLK_SOURCE_31_30_SHIFT);
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break;
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case MASK_BITS_31_29:
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clrsetbits_le32(reg, OUT_CLK_SOURCE_31_29_MASK,
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source << OUT_CLK_SOURCE_31_29_SHIFT);
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break;
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case MASK_BITS_31_28:
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clrsetbits_le32(reg, OUT_CLK_SOURCE_31_28_MASK,
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source << OUT_CLK_SOURCE_31_28_SHIFT);
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break;
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default:
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return -1;
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}
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return 0;
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}
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static int clock_ll_get_source_bits(enum periph_id periph_id, int mux_bits)
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{
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u32 *reg = get_periph_source_reg(periph_id);
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u32 val = readl(reg);
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switch (mux_bits) {
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case MASK_BITS_31_30:
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val >>= OUT_CLK_SOURCE_31_30_SHIFT;
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val &= OUT_CLK_SOURCE_31_30_MASK;
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return val;
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case MASK_BITS_31_29:
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val >>= OUT_CLK_SOURCE_31_29_SHIFT;
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val &= OUT_CLK_SOURCE_31_29_MASK;
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return val;
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case MASK_BITS_31_28:
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val >>= OUT_CLK_SOURCE_31_28_SHIFT;
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val &= OUT_CLK_SOURCE_31_28_MASK;
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return val;
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default:
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return -1;
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}
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}
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void clock_ll_set_source(enum periph_id periph_id, unsigned source)
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{
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clock_ll_set_source_bits(periph_id, MASK_BITS_31_30, source);
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}
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/**
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* Given the parent's rate and the required rate for the children, this works
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* out the peripheral clock divider to use, in 7.1 binary format.
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*
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* @param divider_bits number of divider bits (8 or 16)
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* @param parent_rate clock rate of parent clock in Hz
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* @param rate required clock rate for this clock
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* @return divider which should be used
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*/
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static int clk_get_divider(unsigned divider_bits, unsigned long parent_rate,
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unsigned long rate)
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{
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u64 divider = parent_rate * 2;
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unsigned max_divider = 1 << divider_bits;
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divider += rate - 1;
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do_div(divider, rate);
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if ((s64)divider - 2 < 0)
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return 0;
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if ((s64)divider - 2 >= max_divider)
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return -1;
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return divider - 2;
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}
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int clock_set_pllout(enum clock_id clkid, enum pll_out_id pllout, unsigned rate)
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{
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struct clk_pll *pll = get_pll(clkid);
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int data = 0, div = 0, offset = 0;
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if (!clock_id_is_pll(clkid))
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return -1;
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if (pllout + 1 > pll_num_clkouts[clkid])
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return -1;
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div = clk_get_divider(8, pll_rate[clkid], rate);
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if (div < 0)
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return -1;
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/* out2 and out4 are in the high part of the register */
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if (pllout == PLL_OUT2 || pllout == PLL_OUT4)
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offset = 16;
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data = (div << PLL_OUT_RATIO_SHIFT) |
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PLL_OUT_OVRRIDE | PLL_OUT_CLKEN | PLL_OUT_RSTN;
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clrsetbits_le32(&pll->pll_out[pllout >> 1],
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PLL_OUT_RATIO_MASK << offset, data << offset);
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return 0;
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}
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/**
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* Given the parent's rate and the divider in 7.1 format, this works out the
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* resulting peripheral clock rate.
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*
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* @param parent_rate clock rate of parent clock in Hz
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* @param divider which should be used in 7.1 format
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* @return effective clock rate of peripheral
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*/
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static unsigned long get_rate_from_divider(unsigned long parent_rate,
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int divider)
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{
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u64 rate;
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rate = (u64)parent_rate * 2;
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do_div(rate, divider + 2);
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return rate;
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}
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unsigned long clock_get_periph_rate(enum periph_id periph_id,
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enum clock_id parent)
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{
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u32 *reg = get_periph_source_reg(periph_id);
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unsigned parent_rate = pll_rate[parent];
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int div = (readl(reg) & OUT_CLK_DIVISOR_MASK) >> OUT_CLK_DIVISOR_SHIFT;
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switch (periph_id) {
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case PERIPH_ID_UART1:
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case PERIPH_ID_UART2:
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case PERIPH_ID_UART3:
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case PERIPH_ID_UART4:
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case PERIPH_ID_UART5:
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#ifdef CONFIG_TEGRA20
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/* There's no divider for these clocks in this SoC. */
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return parent_rate;
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#else
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/*
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* This undoes the +2 in get_rate_from_divider() which I
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* believe is incorrect. Ideally we would fix
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* get_rate_from_divider(), but... Removing the +2 from
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* get_rate_from_divider() would probably require remove the -2
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* from the tail of clk_get_divider() since I believe that's
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* only there to invert get_rate_from_divider()'s +2. Observe
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* how find_best_divider() uses those two functions together.
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* However, doing so breaks other stuff, such as Seaboard's
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* display, likely due to clock_set_pllout()'s call to
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* clk_get_divider(). Attempting to fix that by making
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* clock_set_pllout() subtract 2 from clk_get_divider()'s
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* return value doesn't help. In summary this clock driver is
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* quite broken but I'm afraid I have no idea how to fix it
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* without completely replacing it.
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*
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* Be careful to avoid a divide by zero error.
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*/
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if (div >= 1)
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div -= 2;
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break;
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#endif
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default:
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break;
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}
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return get_rate_from_divider(parent_rate, div);
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}
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/**
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* Find the best available 7.1 format divisor given a parent clock rate and
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* required child clock rate. This function assumes that a second-stage
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* divisor is available which can divide by powers of 2 from 1 to 256.
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*
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* @param divider_bits number of divider bits (8 or 16)
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* @param parent_rate clock rate of parent clock in Hz
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* @param rate required clock rate for this clock
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* @param extra_div value for the second-stage divisor (not set if this
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* function returns -1.
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* @return divider which should be used, or -1 if nothing is valid
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*
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*/
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static int find_best_divider(unsigned divider_bits, unsigned long parent_rate,
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unsigned long rate, int *extra_div)
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{
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int shift;
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int best_divider = -1;
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int best_error = rate;
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/* try dividers from 1 to 256 and find closest match */
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for (shift = 0; shift <= 8 && best_error > 0; shift++) {
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unsigned divided_parent = parent_rate >> shift;
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int divider = clk_get_divider(divider_bits, divided_parent,
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rate);
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unsigned effective_rate = get_rate_from_divider(divided_parent,
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divider);
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int error = rate - effective_rate;
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/* Given a valid divider, look for the lowest error */
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if (divider != -1 && error < best_error) {
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best_error = error;
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*extra_div = 1 << shift;
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best_divider = divider;
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}
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}
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/* return what we found - *extra_div will already be set */
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return best_divider;
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}
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/**
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* Adjust peripheral PLL to use the given divider and source.
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*
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* @param periph_id peripheral to adjust
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* @param source Source number (0-3 or 0-7)
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* @param mux_bits Number of mux bits (2 or 4)
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* @param divider Required divider in 7.1 or 15.1 format
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* @return 0 if ok, -1 on error (requesting a parent clock which is not valid
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* for this peripheral)
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*/
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static int adjust_periph_pll(enum periph_id periph_id, int source,
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int mux_bits, unsigned divider)
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{
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u32 *reg = get_periph_source_reg(periph_id);
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clrsetbits_le32(reg, OUT_CLK_DIVISOR_MASK,
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divider << OUT_CLK_DIVISOR_SHIFT);
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udelay(1);
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/* work out the source clock and set it */
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if (source < 0)
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return -1;
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clock_ll_set_source_bits(periph_id, mux_bits, source);
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udelay(2);
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return 0;
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}
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enum clock_id clock_get_periph_parent(enum periph_id periph_id)
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{
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int err, mux_bits, divider_bits, type;
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int source;
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err = get_periph_clock_info(periph_id, &mux_bits, ÷r_bits, &type);
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if (err)
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return CLOCK_ID_NONE;
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source = clock_ll_get_source_bits(periph_id, mux_bits);
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return get_periph_clock_id(periph_id, source);
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}
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unsigned clock_adjust_periph_pll_div(enum periph_id periph_id,
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enum clock_id parent, unsigned rate, int *extra_div)
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{
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unsigned effective_rate;
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int mux_bits, divider_bits, source;
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int divider;
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int xdiv = 0;
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/* work out the source clock and set it */
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source = get_periph_clock_source(periph_id, parent, &mux_bits,
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÷r_bits);
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divider = find_best_divider(divider_bits, pll_rate[parent],
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rate, &xdiv);
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if (extra_div)
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*extra_div = xdiv;
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assert(divider >= 0);
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if (adjust_periph_pll(periph_id, source, mux_bits, divider))
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return -1U;
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debug("periph %d, rate=%d, reg=%p = %x\n", periph_id, rate,
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get_periph_source_reg(periph_id),
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readl(get_periph_source_reg(periph_id)));
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/* Check what we ended up with. This shouldn't matter though */
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effective_rate = clock_get_periph_rate(periph_id, parent);
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if (extra_div)
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effective_rate /= *extra_div;
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if (rate != effective_rate)
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debug("Requested clock rate %u not honored (got %u)\n",
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rate, effective_rate);
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return effective_rate;
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}
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unsigned clock_start_periph_pll(enum periph_id periph_id,
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enum clock_id parent, unsigned rate)
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{
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unsigned effective_rate;
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reset_set_enable(periph_id, 1);
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clock_enable(periph_id);
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udelay(2);
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effective_rate = clock_adjust_periph_pll_div(periph_id, parent, rate,
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NULL);
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|
reset_set_enable(periph_id, 0);
|
|
return effective_rate;
|
|
}
|
|
|
|
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_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 (2 or 4) */
|
|
assert(cpu >= 0 && cpu < MAX_NUM_CPU);
|
|
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 int __weak clk_m_get_rate(unsigned int parent_rate)
|
|
{
|
|
return parent_rate;
|
|
}
|
|
|
|
unsigned clock_get_rate(enum clock_id clkid)
|
|
{
|
|
struct clk_pll *pll;
|
|
u32 base, divm;
|
|
u64 parent_rate, rate;
|
|
struct clk_pll_info *pllinfo = &tegra_pll_info_table[clkid];
|
|
|
|
parent_rate = osc_freq[clock_get_osc_freq()];
|
|
if (clkid == CLOCK_ID_OSC)
|
|
return parent_rate;
|
|
|
|
if (clkid == CLOCK_ID_CLK_M)
|
|
return clk_m_get_rate(parent_rate);
|
|
|
|
pll = get_pll(clkid);
|
|
if (!pll)
|
|
return 0;
|
|
base = readl(&pll->pll_base);
|
|
|
|
rate = parent_rate * ((base >> pllinfo->n_shift) & pllinfo->n_mask);
|
|
divm = (base >> pllinfo->m_shift) & pllinfo->m_mask;
|
|
/*
|
|
* PLLU uses p_mask/p_shift for VCO on all but T210,
|
|
* T210 uses normal DIVP. Handled in pllinfo table.
|
|
*/
|
|
#ifdef CONFIG_TEGRA210
|
|
/*
|
|
* PLLP's primary output (pllP_out0) on T210 is the VCO, and divp is
|
|
* not applied. pllP_out2 does have divp applied. All other pllP_outN
|
|
* are divided down from pllP_out0. We only support pllP_out0 in
|
|
* U-Boot at the time of writing this comment.
|
|
*/
|
|
if (clkid != CLOCK_ID_PERIPH)
|
|
#endif
|
|
divm <<= (base >> pllinfo->p_shift) & pllinfo->p_mask;
|
|
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 overridden), 1 if PLL is already correct
|
|
*/
|
|
int clock_set_rate(enum clock_id clkid, u32 n, u32 m, u32 p, u32 cpcon)
|
|
{
|
|
u32 base_reg, misc_reg;
|
|
struct clk_pll *pll;
|
|
struct clk_pll_info *pllinfo = &tegra_pll_info_table[clkid];
|
|
|
|
pll = get_pll(clkid);
|
|
|
|
base_reg = readl(&pll->pll_base);
|
|
|
|
/* Set BYPASS, m, n and p to PLL_BASE */
|
|
base_reg &= ~(pllinfo->m_mask << pllinfo->m_shift);
|
|
base_reg |= m << pllinfo->m_shift;
|
|
|
|
base_reg &= ~(pllinfo->n_mask << pllinfo->n_shift);
|
|
base_reg |= n << pllinfo->n_shift;
|
|
|
|
base_reg &= ~(pllinfo->p_mask << pllinfo->p_shift);
|
|
base_reg |= p << pllinfo->p_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 (KCP) to PLL_MISC */
|
|
misc_reg = readl(&pll->pll_misc);
|
|
misc_reg &= ~(pllinfo->kcp_mask << pllinfo->kcp_shift);
|
|
misc_reg |= cpcon << pllinfo->kcp_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);
|
|
}
|
|
|
|
#if CONFIG_IS_ENABLED(OF_CONTROL)
|
|
int clock_decode_periph_id(struct udevice *dev)
|
|
{
|
|
enum periph_id id;
|
|
u32 cell[2];
|
|
int err;
|
|
|
|
err = dev_read_u32_array(dev, "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_IS_ENABLED(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("PLLP %x is correct\n", reg);
|
|
return 0;
|
|
}
|
|
|
|
void clock_init(void)
|
|
{
|
|
int i;
|
|
|
|
pll_rate[CLOCK_ID_CGENERAL] = clock_get_rate(CLOCK_ID_CGENERAL);
|
|
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_USB] = clock_get_rate(CLOCK_ID_USB);
|
|
pll_rate[CLOCK_ID_DISPLAY] = clock_get_rate(CLOCK_ID_DISPLAY);
|
|
pll_rate[CLOCK_ID_XCPU] = clock_get_rate(CLOCK_ID_XCPU);
|
|
pll_rate[CLOCK_ID_SFROM32KHZ] = 32768;
|
|
pll_rate[CLOCK_ID_OSC] = clock_get_rate(CLOCK_ID_OSC);
|
|
pll_rate[CLOCK_ID_CLK_M] = clock_get_rate(CLOCK_ID_CLK_M);
|
|
|
|
debug("Osc = %d\n", pll_rate[CLOCK_ID_OSC]);
|
|
debug("CLKM = %d\n", pll_rate[CLOCK_ID_CLK_M]);
|
|
debug("PLLC = %d\n", pll_rate[CLOCK_ID_CGENERAL]);
|
|
debug("PLLM = %d\n", pll_rate[CLOCK_ID_MEMORY]);
|
|
debug("PLLP = %d\n", pll_rate[CLOCK_ID_PERIPH]);
|
|
debug("PLLU = %d\n", pll_rate[CLOCK_ID_USB]);
|
|
debug("PLLD = %d\n", pll_rate[CLOCK_ID_DISPLAY]);
|
|
debug("PLLX = %d\n", pll_rate[CLOCK_ID_XCPU]);
|
|
|
|
for (i = 0; periph_clk_init_table[i].periph_id != -1; i++) {
|
|
enum periph_id periph_id;
|
|
enum clock_id parent;
|
|
int source, mux_bits, divider_bits;
|
|
|
|
periph_id = periph_clk_init_table[i].periph_id;
|
|
parent = periph_clk_init_table[i].parent_clock_id;
|
|
|
|
source = get_periph_clock_source(periph_id, parent, &mux_bits,
|
|
÷r_bits);
|
|
clock_ll_set_source_bits(periph_id, mux_bits, source);
|
|
}
|
|
}
|
|
|
|
static void set_avp_clock_source(u32 src)
|
|
{
|
|
struct clk_rst_ctlr *clkrst =
|
|
(struct clk_rst_ctlr *)NV_PA_CLK_RST_BASE;
|
|
u32 val;
|
|
|
|
val = (src << SCLK_SWAKEUP_FIQ_SOURCE_SHIFT) |
|
|
(src << SCLK_SWAKEUP_IRQ_SOURCE_SHIFT) |
|
|
(src << SCLK_SWAKEUP_RUN_SOURCE_SHIFT) |
|
|
(src << SCLK_SWAKEUP_IDLE_SOURCE_SHIFT) |
|
|
(SCLK_SYS_STATE_RUN << SCLK_SYS_STATE_SHIFT);
|
|
writel(val, &clkrst->crc_sclk_brst_pol);
|
|
udelay(3);
|
|
}
|
|
|
|
/*
|
|
* This function is useful on Tegra30, and any later SoCs that have compatible
|
|
* PLLP configuration registers.
|
|
* NOTE: Not used on Tegra210 - see tegra210_setup_pllp in T210 clock.c
|
|
*/
|
|
void tegra30_set_up_pllp(void)
|
|
{
|
|
struct clk_rst_ctlr *clkrst = (struct clk_rst_ctlr *)NV_PA_CLK_RST_BASE;
|
|
u32 reg;
|
|
|
|
/*
|
|
* Based on the Tegra TRM, the system clock (which is the AVP clock) can
|
|
* run up to 275MHz. On power on, the default sytem clock source is set
|
|
* to PLLP_OUT0. This function sets PLLP's (hence PLLP_OUT0's) rate to
|
|
* 408MHz which is beyond system clock's upper limit.
|
|
*
|
|
* The fix is to set the system clock to CLK_M before initializing PLLP,
|
|
* and then switch back to PLLP_OUT4, which has an appropriate divider
|
|
* configured, after PLLP has been configured
|
|
*/
|
|
set_avp_clock_source(SCLK_SOURCE_CLKM);
|
|
|
|
/*
|
|
* PLLP output frequency set to 408Mhz
|
|
* PLLC output frequency set to 228Mhz
|
|
*/
|
|
switch (clock_get_osc_freq()) {
|
|
case CLOCK_OSC_FREQ_12_0: /* OSC is 12Mhz */
|
|
clock_set_rate(CLOCK_ID_PERIPH, 408, 12, 0, 8);
|
|
clock_set_rate(CLOCK_ID_CGENERAL, 456, 12, 1, 8);
|
|
break;
|
|
|
|
case CLOCK_OSC_FREQ_26_0: /* OSC is 26Mhz */
|
|
clock_set_rate(CLOCK_ID_PERIPH, 408, 26, 0, 8);
|
|
clock_set_rate(CLOCK_ID_CGENERAL, 600, 26, 0, 8);
|
|
break;
|
|
|
|
case CLOCK_OSC_FREQ_13_0: /* OSC is 13Mhz */
|
|
clock_set_rate(CLOCK_ID_PERIPH, 408, 13, 0, 8);
|
|
clock_set_rate(CLOCK_ID_CGENERAL, 600, 13, 0, 8);
|
|
break;
|
|
case CLOCK_OSC_FREQ_19_2:
|
|
default:
|
|
/*
|
|
* These are not supported. It is too early to print a
|
|
* message and the UART likely won't work anyway due to the
|
|
* oscillator being wrong.
|
|
*/
|
|
break;
|
|
}
|
|
|
|
/* Set PLLP_OUT1, 2, 3 & 4 freqs to 9.6, 48, 102 & 204MHz */
|
|
|
|
/* OUT1, 2 */
|
|
/* Assert RSTN before enable */
|
|
reg = PLLP_OUT2_RSTN_EN | PLLP_OUT1_RSTN_EN;
|
|
writel(reg, &clkrst->crc_pll[CLOCK_ID_PERIPH].pll_out[0]);
|
|
/* Set divisor and reenable */
|
|
reg = (IN_408_OUT_48_DIVISOR << PLLP_OUT2_RATIO)
|
|
| PLLP_OUT2_OVR | PLLP_OUT2_CLKEN | PLLP_OUT2_RSTN_DIS
|
|
| (IN_408_OUT_9_6_DIVISOR << PLLP_OUT1_RATIO)
|
|
| PLLP_OUT1_OVR | PLLP_OUT1_CLKEN | PLLP_OUT1_RSTN_DIS;
|
|
writel(reg, &clkrst->crc_pll[CLOCK_ID_PERIPH].pll_out[0]);
|
|
|
|
/* OUT3, 4 */
|
|
/* Assert RSTN before enable */
|
|
reg = PLLP_OUT4_RSTN_EN | PLLP_OUT3_RSTN_EN;
|
|
writel(reg, &clkrst->crc_pll[CLOCK_ID_PERIPH].pll_out[1]);
|
|
/* Set divisor and reenable */
|
|
reg = (IN_408_OUT_204_DIVISOR << PLLP_OUT4_RATIO)
|
|
| PLLP_OUT4_OVR | PLLP_OUT4_CLKEN | PLLP_OUT4_RSTN_DIS
|
|
| (IN_408_OUT_102_DIVISOR << PLLP_OUT3_RATIO)
|
|
| PLLP_OUT3_OVR | PLLP_OUT3_CLKEN | PLLP_OUT3_RSTN_DIS;
|
|
writel(reg, &clkrst->crc_pll[CLOCK_ID_PERIPH].pll_out[1]);
|
|
|
|
set_avp_clock_source(SCLK_SOURCE_PLLP_OUT4);
|
|
}
|
|
|
|
int clock_external_output(int clk_id)
|
|
{
|
|
u32 val;
|
|
|
|
if (clk_id >= 1 && clk_id <= 3) {
|
|
val = tegra_pmc_readl(offsetof(struct pmc_ctlr,
|
|
pmc_clk_out_cntrl));
|
|
val |= 1 << (2 + (clk_id - 1) * 8);
|
|
tegra_pmc_writel(val,
|
|
offsetof(struct pmc_ctlr,
|
|
pmc_clk_out_cntrl));
|
|
|
|
} else {
|
|
printf("%s: Unknown output clock id %d\n", __func__, clk_id);
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
__weak bool clock_early_init_done(void)
|
|
{
|
|
return true;
|
|
}
|