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u-boot/arch/arm/cpu/tegra20-common/clock.c
Stephen Warren 54d2e18292 ARM: tegra: use MASK_BITS_* macros everywhere 
Not all code that set or interpreted "mux_bits" was using the named
macros, but rather some was simply using hard-coded integer constants.
This makes it hard to determine which pieces of code are affected by
changes to those constants.

Replace the integer constants with the equivalent macro definitions so
that everything is nicely tied together.

Note that I'm not convinced all the code was using the correct integer
constants, and hence I'm not convinced that all the code is now using
the desired macros. However, this change is a purely mechanical
replacement and should have no functional change. Fixing any bugs will
come later, separately.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Reviewed-by: Thierry Reding <treding@nvidia.com>
Tested-by: Thierry Reding <treding@nvidia.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Tom Warren <twarren@nvidia.com>
2014-02-03 09:46:45 -07:00

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/*
* Copyright (c) 2011 The Chromium OS Authors.
*
* SPDX-License-Identifier: GPL-2.0+
*/
/* Tegra20 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>
/*
* Clock types that we can use as a source. The Tegra20 has muxes for the
* peripheral clocks, and in most cases there are four options for the clock
* source. This gives us a clock 'type' and exploits what commonality exists
* 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_PCMT16, /* CLOCK_TYPE_PCMT with 16-bit divider */
CLOCK_TYPE_PCXTS,
CLOCK_TYPE_PDCT,
CLOCK_TYPE_COUNT,
CLOCK_TYPE_NONE = -1, /* invalid clock type */
};
enum {
CLOCK_MAX_MUX = 4 /* number of source options for each clock */
};
/*
* Clock source mux for each clock type. This just converts our enum into
* a list of mux sources for use by the code. Note that CLOCK_TYPE_PCXTS
* is special as it has 5 sources. Since it also has a different number of
* bits in its register for the source, we just handle it with a special
* case in the code.
*/
#define CLK(x) CLOCK_ID_ ## x
static enum clock_id clock_source[CLOCK_TYPE_COUNT][CLOCK_MAX_MUX] = {
{ CLK(AUDIO), CLK(XCPU), CLK(PERIPH), CLK(OSC) },
{ CLK(MEMORY), CLK(CGENERAL), CLK(PERIPH), CLK(AUDIO) },
{ CLK(MEMORY), CLK(CGENERAL), CLK(PERIPH), CLK(OSC) },
{ CLK(PERIPH), CLK(CGENERAL), CLK(MEMORY), CLK(NONE) },
{ CLK(PERIPH), CLK(CGENERAL), CLK(MEMORY), CLK(OSC) },
{ CLK(PERIPH), CLK(CGENERAL), CLK(MEMORY), CLK(OSC) },
{ CLK(PERIPH), CLK(CGENERAL), CLK(XCPU), CLK(OSC) },
{ CLK(PERIPH), CLK(DISPLAY), CLK(CGENERAL), CLK(OSC) },
};
/*
* Clock peripheral IDs which sadly don't match up with PERIPH_ID. This is
* not in the header file since it is for purely internal use - we want
* callers to use the PERIPH_ID for all access to peripheral clocks to avoid
* confusion bewteen PERIPH_ID_... and PERIPHC_...
*
* We don't call this CLOCK_PERIPH_ID or PERIPH_CLOCK_ID as it would just be
* confusing.
*
* Note to SOC vendors: perhaps define a unified numbering for peripherals and
* use it for reset, clock enable, clock source/divider and even pinmuxing
* if you can.
*/
enum periphc_internal_id {
/* 0x00 */
PERIPHC_I2S1,
PERIPHC_I2S2,
PERIPHC_SPDIF_OUT,
PERIPHC_SPDIF_IN,
PERIPHC_PWM,
PERIPHC_SPI1,
PERIPHC_SPI2,
PERIPHC_SPI3,
/* 0x08 */
PERIPHC_XIO,
PERIPHC_I2C1,
PERIPHC_DVC_I2C,
PERIPHC_TWC,
PERIPHC_0c,
PERIPHC_10, /* PERIPHC_SPI1, what is this really? */
PERIPHC_DISP1,
PERIPHC_DISP2,
/* 0x10 */
PERIPHC_CVE,
PERIPHC_IDE0,
PERIPHC_VI,
PERIPHC_1c,
PERIPHC_SDMMC1,
PERIPHC_SDMMC2,
PERIPHC_G3D,
PERIPHC_G2D,
/* 0x18 */
PERIPHC_NDFLASH,
PERIPHC_SDMMC4,
PERIPHC_VFIR,
PERIPHC_EPP,
PERIPHC_MPE,
PERIPHC_MIPI,
PERIPHC_UART1,
PERIPHC_UART2,
/* 0x20 */
PERIPHC_HOST1X,
PERIPHC_21,
PERIPHC_TVO,
PERIPHC_HDMI,
PERIPHC_24,
PERIPHC_TVDAC,
PERIPHC_I2C2,
PERIPHC_EMC,
/* 0x28 */
PERIPHC_UART3,
PERIPHC_29,
PERIPHC_VI_SENSOR,
PERIPHC_2b,
PERIPHC_2c,
PERIPHC_SPI4,
PERIPHC_I2C3,
PERIPHC_SDMMC3,
/* 0x30 */
PERIPHC_UART4,
PERIPHC_UART5,
PERIPHC_VDE,
PERIPHC_OWR,
PERIPHC_NOR,
PERIPHC_CSITE,
PERIPHC_COUNT,
PERIPHC_NONE = -1,
};
/*
* 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_PCXTS),
TYPE(PERIPHC_SPI1, CLOCK_TYPE_PCMT),
TYPE(PERIPHC_SPI22, CLOCK_TYPE_PCMT),
TYPE(PERIPHC_SPI3, CLOCK_TYPE_PCMT),
/* 0x08 */
TYPE(PERIPHC_XIO, CLOCK_TYPE_PCMT),
TYPE(PERIPHC_I2C1, CLOCK_TYPE_PCMT16),
TYPE(PERIPHC_DVC_I2C, CLOCK_TYPE_PCMT16),
TYPE(PERIPHC_TWC, CLOCK_TYPE_PCMT),
TYPE(PERIPHC_NONE, CLOCK_TYPE_NONE),
TYPE(PERIPHC_SPI1, CLOCK_TYPE_PCMT),
TYPE(PERIPHC_DISP1, CLOCK_TYPE_PDCT),
TYPE(PERIPHC_DISP2, CLOCK_TYPE_PDCT),
/* 0x10 */
TYPE(PERIPHC_CVE, CLOCK_TYPE_PDCT),
TYPE(PERIPHC_IDE0, CLOCK_TYPE_PCMT),
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_PDCT),
TYPE(PERIPHC_NONE, CLOCK_TYPE_NONE),
TYPE(PERIPHC_TVDAC, CLOCK_TYPE_PDCT),
TYPE(PERIPHC_I2C2, CLOCK_TYPE_PCMT16),
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_SPI4, CLOCK_TYPE_PCMT),
TYPE(PERIPHC_I2C3, CLOCK_TYPE_PCMT16),
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),
};
/*
* 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(RESERVED1),
NONE(RESERVED2),
NONE(AC97),
NONE(RTC),
NONE(TMR),
PERIPHC_UART1,
PERIPHC_UART2, /* and vfir 0x68 */
/* 0x08 */
NONE(GPIO),
PERIPHC_SDMMC2,
NONE(SPDIF), /* 0x08 and 0x0c, unclear which to use */
PERIPHC_I2S1,
PERIPHC_I2C1,
PERIPHC_NDFLASH,
PERIPHC_SDMMC1,
PERIPHC_SDMMC4,
/* 0x10 */
PERIPHC_TWC,
PERIPHC_PWM,
PERIPHC_I2S2,
PERIPHC_EPP,
PERIPHC_VI,
PERIPHC_G2D,
NONE(USBD),
NONE(ISP),
/* 0x18 */
PERIPHC_G3D,
PERIPHC_IDE0,
PERIPHC_DISP2,
PERIPHC_DISP1,
PERIPHC_HOST1X,
NONE(VCP),
NONE(RESERVED30),
NONE(CACHE2),
/* Middle word: 63:32 */
NONE(MEM),
NONE(AHBDMA),
NONE(APBDMA),
NONE(RESERVED35),
NONE(KBC),
NONE(STAT_MON),
NONE(PMC),
NONE(FUSE),
/* 0x28 */
NONE(KFUSE),
NONE(SBC1), /* SBC1, 0x34, is this SPI1? */
PERIPHC_NOR,
PERIPHC_SPI1,
PERIPHC_SPI2,
PERIPHC_XIO,
PERIPHC_SPI3,
PERIPHC_DVC_I2C,
/* 0x30 */
NONE(DSI),
PERIPHC_TVO, /* also CVE 0x40 */
PERIPHC_MIPI,
PERIPHC_HDMI,
PERIPHC_CSITE,
PERIPHC_TVDAC,
PERIPHC_I2C2,
PERIPHC_UART3,
/* 0x38 */
NONE(RESERVED56),
PERIPHC_EMC,
NONE(USB2),
NONE(USB3),
PERIPHC_MPE,
PERIPHC_VDE,
NONE(BSEA),
NONE(BSEV),
/* Upper word 95:64 */
NONE(SPEEDO),
PERIPHC_UART4,
PERIPHC_UART5,
PERIPHC_I2C3,
PERIPHC_SPI4,
PERIPHC_SDMMC3,
NONE(PCIE),
PERIPHC_OWR,
/* 0x48 */
NONE(AFI),
NONE(CORESIGHT),
NONE(RESERVED74),
NONE(AVPUCQ),
NONE(RESERVED76),
NONE(RESERVED77),
NONE(RESERVED78),
NONE(RESERVED79),
/* 0x50 */
NONE(RESERVED80),
NONE(RESERVED81),
NONE(RESERVED82),
NONE(RESERVED83),
NONE(IRAMA),
NONE(IRAMB),
NONE(IRAMC),
NONE(IRAMD),
/* 0x58 */
NONE(CRAM2),
};
/*
* Get the oscillator frequency, from the corresponding hardware configuration
* field. T20 has 4 frequencies that it supports.
*/
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;
}
/* Returns a pointer to the clock source register for a peripheral */
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;
assert(clock_periph_id_isvalid(periph_id));
internal_id = periph_id_to_internal_id[periph_id];
assert(internal_id != -1);
return &clkrst->crc_clk_src[internal_id];
}
/**
* 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)
*/
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));
/*
* Special cases here for the clock with a 4-bit source mux and I2C
* with its 16-bit divisor
*/
if (type == CLOCK_TYPE_PCXTS)
*mux_bits = MASK_BITS_31_28;
else
*mux_bits = MASK_BITS_31_30;
if (type == CLOCK_TYPE_PCMT16)
*divider_bits = 16;
else
*divider_bits = 8;
for (mux = 0; mux < CLOCK_MAX_MUX; mux++)
if (clock_source[type][mux] == parent)
return mux;
/*
* Not found: it might be looking for the 'S' in CLOCK_TYPE_PCXTS
* which is not in our table. If not, then they are asking for a
* source which this peripheral can't access through its mux.
*/
assert(type == CLOCK_TYPE_PCXTS);
assert(parent == CLOCK_ID_SFROM32KHZ);
if (type == CLOCK_TYPE_PCXTS && parent == CLOCK_ID_SFROM32KHZ)
return 4; /* mux value for this clock */
/* 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;
}
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 = &clkrst->crc_clk_out_enb[PERIPH_REG(periph_id)];
u32 reg;
/* Enable/disable the clock to this peripheral */
assert(clock_periph_id_isvalid(periph_id));
reg = readl(clk);
if (enable)
reg |= PERIPH_MASK(periph_id);
else
reg &= ~PERIPH_MASK(periph_id);
writel(reg, clk);
}
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 = &clkrst->crc_rst_dev[PERIPH_REG(periph_id)];
u32 reg;
/* Enable/disable reset to the peripheral */
assert(clock_periph_id_isvalid(periph_id));
reg = readl(reset);
if (enable)
reg |= PERIPH_MASK(periph_id);
else
reg &= ~PERIPH_MASK(periph_id);
writel(reg, reset);
}
#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
*/
enum periph_id clk_id_to_periph_id(int clk_id)
{
if (clk_id > PERIPH_ID_COUNT)
return PERIPH_ID_NONE;
switch (clk_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:
return PERIPH_ID_NONE;
default:
return clk_id;
}
}
#endif /* CONFIG_OF_CONTROL */
void clock_early_init(void)
{
/*
* PLLP output frequency set to 216MHz
* PLLC output frequency set to 600Mhz
*
* TODO: Can we calculate these values instead of hard-coding?
*/
switch (clock_get_osc_freq()) {
case CLOCK_OSC_FREQ_12_0: /* OSC is 12Mhz */
clock_set_rate(CLOCK_ID_PERIPH, 432, 12, 1, 8);
clock_set_rate(CLOCK_ID_CGENERAL, 600, 12, 0, 8);
break;
case CLOCK_OSC_FREQ_26_0: /* OSC is 26Mhz */
clock_set_rate(CLOCK_ID_PERIPH, 432, 26, 1, 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, 432, 13, 1, 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 arch_timer_init(void)
{
}
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