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Diffstat (limited to 'arch/arm/cpu/tegra30-common/clock.c')
| -rw-r--r-- | arch/arm/cpu/tegra30-common/clock.c | 1092 |
1 files changed, 1092 insertions, 0 deletions
diff --git a/arch/arm/cpu/tegra30-common/clock.c b/arch/arm/cpu/tegra30-common/clock.c new file mode 100644 index 0000000000..5db9d207a2 --- /dev/null +++ b/arch/arm/cpu/tegra30-common/clock.c @@ -0,0 +1,1092 @@ +/* + * Copyright (c) 2010-2012, NVIDIA CORPORATION. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope 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, see <http://www.gnu.org/licenses/>. + */ + +/* Tegra30 Clock control functions */ + +#include <common.h> +#include <asm/io.h> +#include <asm/arch/clock.h> +#include <asm/arch/tegra.h> +#include <asm/arch-tegra/clk_rst.h> +#include <asm/arch-tegra/timer.h> +#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 Tegra3 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 + * in the device. + * + * Letters are obvious, except for T which means CLK_M, and S which means the + * clock derived from 32KHz. Beware that CLK_M (also called OSC in the + * datasheet) and PLL_M are different things. The former is the basic + * clock supplied to the SOC from an external oscillator. The latter is the + * memory clock PLL. + * + * See definitions in clock_id in the header file. + */ +enum clock_type_id { + CLOCK_TYPE_AXPT, /* PLL_A, PLL_X, PLL_P, CLK_M */ + CLOCK_TYPE_MCPA, /* and so on */ + CLOCK_TYPE_MCPT, + CLOCK_TYPE_PCM, + CLOCK_TYPE_PCMT, + CLOCK_TYPE_PDCT, + CLOCK_TYPE_ACPT, + CLOCK_TYPE_ASPTE, + CLOCK_TYPE_PMDACD2T, + CLOCK_TYPE_PCST, + + CLOCK_TYPE_COUNT, + 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 = 8 /* number of source options for each clock */ +}; + +enum { + MASK_BITS_31_30 = 2, /* num of bits used to specify clock source */ + MASK_BITS_31_29, + MASK_BITS_29_28, +}; + +/* + * Clock source mux for each clock type. This just converts our enum into + * a list of mux sources for use by the code. + * + * Note: + * The extra column in each clock source array is used to store the mask + * bits in its register for the source. + */ +#define CLK(x) CLOCK_ID_ ## x +static enum clock_id clock_source[CLOCK_TYPE_COUNT][CLOCK_MAX_MUX+1] = { + { CLK(AUDIO), CLK(XCPU), CLK(PERIPH), CLK(OSC), + CLK(NONE), CLK(NONE), CLK(NONE), CLK(NONE), + MASK_BITS_31_30}, + { CLK(MEMORY), CLK(CGENERAL), CLK(PERIPH), CLK(AUDIO), + CLK(NONE), CLK(NONE), CLK(NONE), CLK(NONE), + MASK_BITS_31_30}, + { CLK(MEMORY), CLK(CGENERAL), CLK(PERIPH), CLK(OSC), + CLK(NONE), CLK(NONE), CLK(NONE), CLK(NONE), + MASK_BITS_31_30}, + { CLK(PERIPH), CLK(CGENERAL), CLK(MEMORY), CLK(NONE), + CLK(NONE), CLK(NONE), CLK(NONE), CLK(NONE), + MASK_BITS_31_30}, + { CLK(PERIPH), CLK(CGENERAL), CLK(MEMORY), CLK(OSC), + CLK(NONE), CLK(NONE), CLK(NONE), CLK(NONE), + MASK_BITS_31_30}, + { CLK(PERIPH), CLK(DISPLAY), CLK(CGENERAL), CLK(OSC), + CLK(NONE), CLK(NONE), CLK(NONE), CLK(NONE), + MASK_BITS_31_30}, + { CLK(AUDIO), CLK(CGENERAL), CLK(PERIPH), CLK(OSC), + CLK(NONE), CLK(NONE), CLK(NONE), CLK(NONE), + MASK_BITS_31_30}, + { CLK(AUDIO), CLK(SFROM32KHZ), CLK(PERIPH), CLK(OSC), + CLK(EPCI), CLK(NONE), CLK(NONE), CLK(NONE), + MASK_BITS_31_29}, + { CLK(PERIPH), CLK(MEMORY), CLK(DISPLAY), CLK(AUDIO), + CLK(CGENERAL), CLK(DISPLAY2), CLK(OSC), CLK(NONE), + MASK_BITS_31_29}, + { CLK(PERIPH), CLK(CGENERAL), CLK(SFROM32KHZ), CLK(OSC), + CLK(NONE), CLK(NONE), CLK(NONE), CLK(NONE), + MASK_BITS_29_28} +}; + +/* 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 + */ +#define TYPE(name, type) type +static enum clock_type_id clock_periph_type[PERIPHC_COUNT] = { + /* 0x00 */ + TYPE(PERIPHC_I2S1, CLOCK_TYPE_AXPT), + TYPE(PERIPHC_I2S2, CLOCK_TYPE_AXPT), + TYPE(PERIPHC_SPDIF_OUT, CLOCK_TYPE_AXPT), + TYPE(PERIPHC_SPDIF_IN, CLOCK_TYPE_PCM), + TYPE(PERIPHC_PWM, CLOCK_TYPE_PCST), + TYPE(PERIPHC_NONE, CLOCK_TYPE_NONE), + TYPE(PERIPHC_SBC2, CLOCK_TYPE_PCMT), + TYPE(PERIPHC_SBC3, CLOCK_TYPE_PCMT), + + /* 0x08 */ + TYPE(PERIPHC_NONE, CLOCK_TYPE_NONE), + TYPE(PERIPHC_I2C1, CLOCK_TYPE_PCMT), + TYPE(PERIPHC_DVC_I2C, CLOCK_TYPE_PCMT), + TYPE(PERIPHC_NONE, CLOCK_TYPE_NONE), + TYPE(PERIPHC_NONE, CLOCK_TYPE_NONE), + TYPE(PERIPHC_SBC1, CLOCK_TYPE_PCMT), + TYPE(PERIPHC_DISP1, CLOCK_TYPE_PMDACD2T), + TYPE(PERIPHC_DISP2, CLOCK_TYPE_PMDACD2T), + + /* 0x10 */ + TYPE(PERIPHC_CVE, CLOCK_TYPE_PDCT), + TYPE(PERIPHC_NONE, CLOCK_TYPE_NONE), + TYPE(PERIPHC_VI, CLOCK_TYPE_MCPA), + TYPE(PERIPHC_NONE, CLOCK_TYPE_NONE), + TYPE(PERIPHC_SDMMC1, CLOCK_TYPE_PCMT), + TYPE(PERIPHC_SDMMC2, CLOCK_TYPE_PCMT), + TYPE(PERIPHC_G3D, CLOCK_TYPE_MCPA), + TYPE(PERIPHC_G2D, CLOCK_TYPE_MCPA), + + /* 0x18 */ + TYPE(PERIPHC_NDFLASH, CLOCK_TYPE_PCMT), + TYPE(PERIPHC_SDMMC4, CLOCK_TYPE_PCMT), + TYPE(PERIPHC_VFIR, CLOCK_TYPE_PCMT), + TYPE(PERIPHC_EPP, CLOCK_TYPE_MCPA), + TYPE(PERIPHC_MPE, CLOCK_TYPE_MCPA), + TYPE(PERIPHC_MIPI, CLOCK_TYPE_PCMT), + TYPE(PERIPHC_UART1, CLOCK_TYPE_PCMT), + TYPE(PERIPHC_UART2, CLOCK_TYPE_PCMT), + + /* 0x20 */ + TYPE(PERIPHC_HOST1X, CLOCK_TYPE_MCPA), + TYPE(PERIPHC_NONE, CLOCK_TYPE_NONE), + TYPE(PERIPHC_TVO, CLOCK_TYPE_PDCT), + TYPE(PERIPHC_HDMI, CLOCK_TYPE_PMDACD2T), + TYPE(PERIPHC_NONE, CLOCK_TYPE_NONE), + TYPE(PERIPHC_TVDAC, CLOCK_TYPE_PDCT), + TYPE(PERIPHC_I2C2, CLOCK_TYPE_PCMT), + TYPE(PERIPHC_EMC, CLOCK_TYPE_MCPT), + + /* 0x28 */ + TYPE(PERIPHC_UART3, CLOCK_TYPE_PCMT), + TYPE(PERIPHC_NONE, CLOCK_TYPE_NONE), + TYPE(PERIPHC_VI, CLOCK_TYPE_MCPA), + TYPE(PERIPHC_NONE, CLOCK_TYPE_NONE), + TYPE(PERIPHC_NONE, CLOCK_TYPE_NONE), + TYPE(PERIPHC_SBC4, CLOCK_TYPE_PCMT), + TYPE(PERIPHC_I2C3, CLOCK_TYPE_PCMT), + TYPE(PERIPHC_SDMMC3, CLOCK_TYPE_PCMT), + + /* 0x30 */ + TYPE(PERIPHC_UART4, CLOCK_TYPE_PCMT), + TYPE(PERIPHC_UART5, CLOCK_TYPE_PCMT), + TYPE(PERIPHC_VDE, CLOCK_TYPE_PCMT), + TYPE(PERIPHC_OWR, CLOCK_TYPE_PCMT), + TYPE(PERIPHC_NOR, CLOCK_TYPE_PCMT), + TYPE(PERIPHC_CSITE, CLOCK_TYPE_PCMT), + TYPE(PERIPHC_I2S0, CLOCK_TYPE_AXPT), + TYPE(PERIPHC_NONE, CLOCK_TYPE_NONE), + + /* 0x38h */ + TYPE(PERIPHC_G3D2, CLOCK_TYPE_MCPA), + TYPE(PERIPHC_MSELECT, CLOCK_TYPE_PCMT), + TYPE(PERIPHC_TSENSOR, CLOCK_TYPE_PCM), + TYPE(PERIPHC_I2S3, CLOCK_TYPE_AXPT), + TYPE(PERIPHC_I2S4, CLOCK_TYPE_AXPT), + TYPE(PERIPHC_I2C4, CLOCK_TYPE_PCMT), + TYPE(PERIPHC_SBC5, CLOCK_TYPE_PCMT), + TYPE(PERIPHC_SBC6, CLOCK_TYPE_PCMT), + + /* 0x40 */ + TYPE(PERIPHC_AUDIO, CLOCK_TYPE_ACPT), + TYPE(PERIPHC_NONE, CLOCK_TYPE_NONE), + TYPE(PERIPHC_DAM0, CLOCK_TYPE_ACPT), + TYPE(PERIPHC_DAM1, CLOCK_TYPE_ACPT), + TYPE(PERIPHC_DAM2, CLOCK_TYPE_ACPT), + TYPE(PERIPHC_HDA2CODEC2X, CLOCK_TYPE_PCMT), + TYPE(PERIPHC_ACTMON, CLOCK_TYPE_PCM), + TYPE(PERIPHC_EXTPERIPH1, CLOCK_TYPE_ASPTE), + + /* 0x48 */ + TYPE(PERIPHC_EXTPERIPH2, CLOCK_TYPE_ASPTE), + TYPE(PERIPHC_EXTPERIPH3, CLOCK_TYPE_ASPTE), + TYPE(PERIPHC_NANDSPEED, CLOCK_TYPE_PCMT), + TYPE(PERIPHC_I2CSLOW, CLOCK_TYPE_PCMT), + TYPE(PERIPHC_SYS, CLOCK_TYPE_NONE), + TYPE(PERIPHC_SPEEDO, CLOCK_TYPE_PCMT), + TYPE(PERIPHC_NONE, CLOCK_TYPE_NONE), + TYPE(PERIPHC_NONE, CLOCK_TYPE_NONE), + + /* 0x50 */ + TYPE(PERIPHC_SATAOOB, CLOCK_TYPE_PCMT), + TYPE(PERIPHC_SATA, CLOCK_TYPE_PCMT), + TYPE(PERIPHC_HDA, CLOCK_TYPE_PCMT), +}; + +/* + * This array translates a periph_id to a periphc_internal_id + * + * Not present/matched up: + * uint vi_sensor; _VI_SENSOR_0, 0x1A8 + * SPDIF - which is both 0x08 and 0x0c + * + */ +#define NONE(name) (-1) +#define OFFSET(name, value) PERIPHC_ ## name +static s8 periph_id_to_internal_id[PERIPH_ID_COUNT] = { + /* Low word: 31:0 */ + NONE(CPU), + NONE(COP), + NONE(TRIGSYS), + NONE(RESERVED3), + NONE(RESERVED4), + NONE(TMR), + PERIPHC_UART1, + PERIPHC_UART2, /* and vfir 0x68 */ + + /* 8 */ + NONE(GPIO), + PERIPHC_SDMMC2, + NONE(SPDIF), /* 0x08 and 0x0c, unclear which to use */ + PERIPHC_I2S1, + PERIPHC_I2C1, + PERIPHC_NDFLASH, + PERIPHC_SDMMC1, + PERIPHC_SDMMC4, + + /* 16 */ + NONE(RESERVED16), + PERIPHC_PWM, + PERIPHC_I2S2, + PERIPHC_EPP, + PERIPHC_VI, + PERIPHC_G2D, + NONE(USBD), + NONE(ISP), + + /* 24 */ + PERIPHC_G3D, + NONE(RESERVED25), + PERIPHC_DISP2, + PERIPHC_DISP1, + PERIPHC_HOST1X, + NONE(VCP), + PERIPHC_I2S0, + NONE(CACHE2), + + /* Middle word: 63:32 */ + NONE(MEM), + NONE(AHBDMA), + NONE(APBDMA), + NONE(RESERVED35), + NONE(RESERVED36), + NONE(STAT_MON), + NONE(RESERVED38), + NONE(RESERVED39), + + /* 40 */ + NONE(KFUSE), + NONE(SBC1), /* SBC1, 0x34, is this SPI1? */ + PERIPHC_NOR, + NONE(RESERVED43), + PERIPHC_SBC2, + NONE(RESERVED45), + PERIPHC_SBC3, + PERIPHC_DVC_I2C, + + /* 48 */ + NONE(DSI), + PERIPHC_TVO, /* also CVE 0x40 */ + PERIPHC_MIPI, + PERIPHC_HDMI, + NONE(CSI), + PERIPHC_TVDAC, + PERIPHC_I2C2, + PERIPHC_UART3, + + /* 56 */ + NONE(RESERVED56), + PERIPHC_EMC, + NONE(USB2), + NONE(USB3), + PERIPHC_MPE, + PERIPHC_VDE, + NONE(BSEA), + NONE(BSEV), + + /* Upper word 95:64 */ + PERIPHC_SPEEDO, + PERIPHC_UART4, + PERIPHC_UART5, + PERIPHC_I2C3, + PERIPHC_SBC4, + PERIPHC_SDMMC3, + NONE(PCIE), + PERIPHC_OWR, + + /* 72 */ + NONE(AFI), + PERIPHC_CSITE, + NONE(PCIEXCLK), + NONE(AVPUCQ), + NONE(RESERVED76), + NONE(RESERVED77), + NONE(RESERVED78), + NONE(DTV), + + /* 80 */ + PERIPHC_NANDSPEED, + PERIPHC_I2CSLOW, + NONE(DSIB), + NONE(RESERVED83), + NONE(IRAMA), + NONE(IRAMB), + NONE(IRAMC), + NONE(IRAMD), + + /* 88 */ + NONE(CRAM2), + NONE(RESERVED89), + NONE(MDOUBLER), + NONE(RESERVED91), + NONE(SUSOUT), + NONE(RESERVED93), + NONE(RESERVED94), + NONE(RESERVED95), + + /* V word: 31:0 */ + NONE(CPUG), + NONE(CPULP), + PERIPHC_G3D2, + PERIPHC_MSELECT, + PERIPHC_TSENSOR, + PERIPHC_I2S3, + PERIPHC_I2S4, + PERIPHC_I2C4, + + /* 08 */ + PERIPHC_SBC5, + PERIPHC_SBC6, + PERIPHC_AUDIO, + NONE(APBIF), + PERIPHC_DAM0, + PERIPHC_DAM1, + PERIPHC_DAM2, + PERIPHC_HDA2CODEC2X, + + /* 16 */ + NONE(ATOMICS), + NONE(RESERVED17), + NONE(RESERVED18), + NONE(RESERVED19), + NONE(RESERVED20), + NONE(RESERVED21), + NONE(RESERVED22), + PERIPHC_ACTMON, + + /* 24 */ + NONE(RESERVED24), + NONE(RESERVED25), + NONE(RESERVED26), + NONE(RESERVED27), + PERIPHC_SATA, + PERIPHC_HDA, + NONE(RESERVED30), + NONE(RESERVED31), + + /* W word: 31:0 */ + NONE(HDA2HDMICODEC), + NONE(SATACOLD), + NONE(RESERVED0_PCIERX0), + NONE(RESERVED1_PCIERX1), + NONE(RESERVED2_PCIERX2), + NONE(RESERVED3_PCIERX3), + NONE(RESERVED4_PCIERX4), + NONE(RESERVED5_PCIERX5), + + /* 40 */ + NONE(CEC), + NONE(RESERVED6_PCIE2), + NONE(RESERVED7_EMC), + NONE(RESERVED8_HDMI), + NONE(RESERVED9_SATA), + NONE(RESERVED10_MIPI), + NONE(EX_RESERVED46), + NONE(EX_RESERVED47), +}; + +/* + * Get the oscillator frequency, from the corresponding hardware configuration + * field. + */ +enum clock_osc_freq clock_get_osc_freq(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_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; +} + +/* Returns a pointer to the clock source register for a peripheral */ +static u32 *get_periph_source_reg(enum periph_id periph_id) +{ + struct clk_rst_ctlr *clkrst = + (struct clk_rst_ctlr *)NV_PA_CLK_RST_BASE; + enum periphc_internal_id internal_id; + + /* Coresight is a special case */ + if (periph_id == PERIPH_ID_CSI) + return &clkrst->crc_clk_src[PERIPH_ID_CSI+1]; + + assert(periph_id >= PERIPH_ID_FIRST && periph_id < PERIPH_ID_COUNT); + internal_id = periph_id_to_internal_id[periph_id]; + assert(internal_id != -1); + if (internal_id >= PERIPHC_VW_FIRST) { + internal_id -= PERIPHC_VW_FIRST; + return &clkrst->crc_clk_src_vw[internal_id]; + } else + 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); +} + +/** + * 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. + * + * There is special code here to handle the one source type with 5 sources. + * + * @param periph_id peripheral to start + * @param source PLL id of required parent clock + * @param mux_bits Set to number of bits in mux register: 2 or 4 + * @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, + enum clock_id parent, int *mux_bits, int *divider_bits) +{ + enum clock_type_id type; + enum periphc_internal_id internal_id; + int mux; + + assert(clock_periph_id_isvalid(periph_id)); + + internal_id = periph_id_to_internal_id[periph_id]; + assert(periphc_internal_id_isvalid(internal_id)); + + type = clock_periph_type[internal_id]; + assert(clock_type_id_isvalid(type)); + + *mux_bits = clock_source[type][CLOCK_MAX_MUX]; + + for (mux = 0; mux < CLOCK_MAX_MUX; mux++) + if (clock_source[type][mux] == parent) + return mux; + + /* if we get here, either us or the caller has made a mistake */ + printf("Caller requested bad clock: periph=%d, parent=%d\n", periph_id, + parent); + 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, source; + int divider, divider_bits = 0; + + /* 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 = + (struct clk_rst_ctlr *)NV_PA_CLK_RST_BASE; + u32 *clk; + u32 reg; + + /* Enable/disable the clock to this peripheral */ + assert(clock_periph_id_isvalid(periph_id)); + if ((int)periph_id < (int)PERIPH_ID_VW_FIRST) + clk = &clkrst->crc_clk_out_enb[PERIPH_REG(periph_id)]; + else + clk = &clkrst->crc_clk_out_enb_vw[PERIPH_REG(periph_id)]; + reg = readl(clk); + if (enable) + reg |= PERIPH_MASK(periph_id); + else + reg &= ~PERIPH_MASK(periph_id); + 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 = + (struct clk_rst_ctlr *)NV_PA_CLK_RST_BASE; + u32 *reset; + u32 reg; + + /* Enable/disable reset to the peripheral */ + assert(clock_periph_id_isvalid(periph_id)); + if (periph_id < PERIPH_ID_VW_FIRST) + reset = &clkrst->crc_rst_dev[PERIPH_REG(periph_id)]; + else + reset = &clkrst->crc_rst_dev_vw[PERIPH_REG(periph_id)]; + reg = readl(reset); + if (enable) + reg |= PERIPH_MASK(periph_id); + else + reg &= ~PERIPH_MASK(periph_id); + 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. Tegra3 has 4 */ + assert(cpu >= 0 && cpu < 4); + 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 + * the same but we are very cautious so we check that a valid clock ID is + * provided. + * + * @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) +{ + if (clk_id > 95) + 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: + 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("PLLP %x is correct\n", reg); + return 0; +} + +void clock_early_init(void) +{ + /* + * 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; + } +} + +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]); +} |
