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linux/arch/powerpc/platforms/512x/clock-commonclk.c

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/*
* Copyright (C) 2013 DENX Software Engineering
*
* Gerhard Sittig, <gsi@denx.de>
*
* common clock driver support for the MPC512x platform
*
* This 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.
*/
#include <linux/bitops.h>
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/clkdev.h>
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <asm/mpc5121.h>
#include <dt-bindings/clock/mpc512x-clock.h>
#include "mpc512x.h" /* our public mpc5121_clk_init() API */
/* helpers to keep the MCLK intermediates "somewhere" in our table */
enum {
MCLK_IDX_MUX0,
MCLK_IDX_EN0,
MCLK_IDX_DIV0,
MCLK_MAX_IDX,
};
#define NR_PSCS 12
#define NR_MSCANS 4
#define NR_SPDIFS 1
#define NR_OUTCLK 4
#define NR_MCLKS (NR_PSCS + NR_MSCANS + NR_SPDIFS + NR_OUTCLK)
/* extend the public set of clocks by adding internal slots for management */
enum {
/* arrange for adjacent numbers after the public set */
MPC512x_CLK_START_PRIVATE = MPC512x_CLK_LAST_PUBLIC,
/* clocks which aren't announced to the public */
MPC512x_CLK_DDR,
MPC512x_CLK_MEM,
MPC512x_CLK_IIM,
/* intermediates in div+gate combos or fractional dividers */
MPC512x_CLK_DDR_UG,
MPC512x_CLK_SDHC_x4,
MPC512x_CLK_SDHC_UG,
MPC512x_CLK_SDHC2_UG,
MPC512x_CLK_DIU_x4,
MPC512x_CLK_DIU_UG,
MPC512x_CLK_MBX_BUS_UG,
MPC512x_CLK_MBX_UG,
MPC512x_CLK_MBX_3D_UG,
MPC512x_CLK_PCI_UG,
MPC512x_CLK_NFC_UG,
MPC512x_CLK_LPC_UG,
MPC512x_CLK_SPDIF_TX_IN,
/* intermediates for the mux+gate+div+mux MCLK generation */
MPC512x_CLK_MCLKS_FIRST,
MPC512x_CLK_MCLKS_LAST = MPC512x_CLK_MCLKS_FIRST
+ NR_MCLKS * MCLK_MAX_IDX,
/* internal, symbolic spec for the number of slots */
MPC512x_CLK_LAST_PRIVATE,
};
/* data required for the OF clock provider registration */
static struct clk *clks[MPC512x_CLK_LAST_PRIVATE];
static struct clk_onecell_data clk_data;
/* CCM register access */
static struct mpc512x_ccm __iomem *clkregs;
static DEFINE_SPINLOCK(clklock);
/* SoC variants {{{ */
/*
* tell SoC variants apart as they are rather similar yet not identical,
* cache the result in an enum to not repeatedly run the expensive OF test
*
* MPC5123 is an MPC5121 without the MBX graphics accelerator
*
* MPC5125 has many more differences: no MBX, no AXE, no VIU, no SPDIF,
* no PATA, no SATA, no PCI, two FECs (of different compatibility name),
* only 10 PSCs (of different compatibility name), two SDHCs, different
* NFC IP block, output clocks, system PLL status query, different CPMF
* interpretation, no CFM, different fourth PSC/CAN mux0 input -- yet
* those differences can get folded into this clock provider support
* code and don't warrant a separate highly redundant implementation
*/
static enum soc_type {
MPC512x_SOC_MPC5121,
MPC512x_SOC_MPC5123,
MPC512x_SOC_MPC5125,
} soc;
static void mpc512x_clk_determine_soc(void)
{
if (of_machine_is_compatible("fsl,mpc5121")) {
soc = MPC512x_SOC_MPC5121;
return;
}
if (of_machine_is_compatible("fsl,mpc5123")) {
soc = MPC512x_SOC_MPC5123;
return;
}
if (of_machine_is_compatible("fsl,mpc5125")) {
soc = MPC512x_SOC_MPC5125;
return;
}
}
static bool soc_has_mbx(void)
{
if (soc == MPC512x_SOC_MPC5121)
return true;
return false;
}
static bool soc_has_axe(void)
{
if (soc == MPC512x_SOC_MPC5125)
return false;
return true;
}
static bool soc_has_viu(void)
{
if (soc == MPC512x_SOC_MPC5125)
return false;
return true;
}
static bool soc_has_spdif(void)
{
if (soc == MPC512x_SOC_MPC5125)
return false;
return true;
}
static bool soc_has_pata(void)
{
if (soc == MPC512x_SOC_MPC5125)
return false;
return true;
}
static bool soc_has_sata(void)
{
if (soc == MPC512x_SOC_MPC5125)
return false;
return true;
}
static bool soc_has_pci(void)
{
if (soc == MPC512x_SOC_MPC5125)
return false;
return true;
}
static bool soc_has_fec2(void)
{
if (soc == MPC512x_SOC_MPC5125)
return true;
return false;
}
static int soc_max_pscnum(void)
{
if (soc == MPC512x_SOC_MPC5125)
return 10;
return 12;
}
static bool soc_has_sdhc2(void)
{
if (soc == MPC512x_SOC_MPC5125)
return true;
return false;
}
static bool soc_has_nfc_5125(void)
{
if (soc == MPC512x_SOC_MPC5125)
return true;
return false;
}
static bool soc_has_outclk(void)
{
if (soc == MPC512x_SOC_MPC5125)
return true;
return false;
}
static bool soc_has_cpmf_0_bypass(void)
{
if (soc == MPC512x_SOC_MPC5125)
return true;
return false;
}
static bool soc_has_mclk_mux0_canin(void)
{
if (soc == MPC512x_SOC_MPC5125)
return true;
return false;
}
/* }}} SoC variants */
/* common clk API wrappers {{{ */
/* convenience wrappers around the common clk API */
static inline struct clk *mpc512x_clk_fixed(const char *name, int rate)
{
return clk_register_fixed_rate(NULL, name, NULL, 0, rate);
}
static inline struct clk *mpc512x_clk_factor(
const char *name, const char *parent_name,
int mul, int div)
{
int clkflags;
clkflags = CLK_SET_RATE_PARENT;
return clk_register_fixed_factor(NULL, name, parent_name, clkflags,
mul, div);
}
static inline struct clk *mpc512x_clk_divider(
const char *name, const char *parent_name, u8 clkflags,
u32 __iomem *reg, u8 pos, u8 len, int divflags)
{
return clk_register_divider(NULL, name, parent_name, clkflags,
reg, pos, len, divflags, &clklock);
}
static inline struct clk *mpc512x_clk_divtable(
const char *name, const char *parent_name,
u32 __iomem *reg, u8 pos, u8 len,
const struct clk_div_table *divtab)
{
u8 divflags;
divflags = 0;
return clk_register_divider_table(NULL, name, parent_name, 0,
reg, pos, len, divflags,
divtab, &clklock);
}
static inline struct clk *mpc512x_clk_gated(
const char *name, const char *parent_name,
u32 __iomem *reg, u8 pos)
{
int clkflags;
clkflags = CLK_SET_RATE_PARENT;
return clk_register_gate(NULL, name, parent_name, clkflags,
reg, pos, 0, &clklock);
}
static inline struct clk *mpc512x_clk_muxed(const char *name,
const char **parent_names, int parent_count,
u32 __iomem *reg, u8 pos, u8 len)
{
int clkflags;
u8 muxflags;
clkflags = CLK_SET_RATE_PARENT;
muxflags = 0;
return clk_register_mux(NULL, name,
parent_names, parent_count, clkflags,
reg, pos, len, muxflags, &clklock);
}
/* }}} common clk API wrappers */
/* helper to isolate a bit field from a register */
static inline int get_bit_field(uint32_t __iomem *reg, uint8_t pos, uint8_t len)
{
uint32_t val;
val = in_be32(reg);
val >>= pos;
val &= (1 << len) - 1;
return val;
}
/* get the SPMF and translate it into the "sys pll" multiplier */
static int get_spmf_mult(void)
{
static int spmf_to_mult[] = {
68, 1, 12, 16, 20, 24, 28, 32,
36, 40, 44, 48, 52, 56, 60, 64,
};
int spmf;
spmf = get_bit_field(&clkregs->spmr, 24, 4);
return spmf_to_mult[spmf];
}
/*
* get the SYS_DIV value and translate it into a divide factor
*
* values returned from here are a multiple of the real factor since the
* divide ratio is fractional
*/
static int get_sys_div_x2(void)
{
static int sysdiv_code_to_x2[] = {
4, 5, 6, 7, 8, 9, 10, 14,
12, 16, 18, 22, 20, 24, 26, 30,
28, 32, 34, 38, 36, 40, 42, 46,
44, 48, 50, 54, 52, 56, 58, 62,
60, 64, 66,
};
int divcode;
divcode = get_bit_field(&clkregs->scfr2, 26, 6);
return sysdiv_code_to_x2[divcode];
}
/*
* get the CPMF value and translate it into a multiplier factor
*
* values returned from here are a multiple of the real factor since the
* multiplier ratio is fractional
*/
static int get_cpmf_mult_x2(void)
{
static int cpmf_to_mult_x36[] = {
/* 0b000 is "times 36" */
72, 2, 2, 3, 4, 5, 6, 7,
};
static int cpmf_to_mult_0by[] = {
/* 0b000 is "bypass" */
2, 2, 2, 3, 4, 5, 6, 7,
};
int *cpmf_to_mult;
int cpmf;
cpmf = get_bit_field(&clkregs->spmr, 16, 4);
if (soc_has_cpmf_0_bypass())
cpmf_to_mult = cpmf_to_mult_0by;
else
cpmf_to_mult = cpmf_to_mult_x36;
return cpmf_to_mult[cpmf];
}
/*
* some of the clock dividers do scale in a linear way, yet not all of
* their bit combinations are legal; use a divider table to get a
* resulting set of applicable divider values
*/
/* applies to the IPS_DIV, and PCI_DIV values */
static struct clk_div_table divtab_2346[] = {
{ .val = 2, .div = 2, },
{ .val = 3, .div = 3, },
{ .val = 4, .div = 4, },
{ .val = 6, .div = 6, },
{ .div = 0, },
};
/* applies to the MBX_DIV, LPC_DIV, and NFC_DIV values */
static struct clk_div_table divtab_1234[] = {
{ .val = 1, .div = 1, },
{ .val = 2, .div = 2, },
{ .val = 3, .div = 3, },
{ .val = 4, .div = 4, },
{ .div = 0, },
};
static int get_freq_from_dt(char *propname)
{
struct device_node *np;
const unsigned int *prop;
int val;
val = 0;
np = of_find_compatible_node(NULL, NULL, "fsl,mpc5121-immr");
if (np) {
prop = of_get_property(np, propname, NULL);
if (prop)
val = *prop;
of_node_put(np);
}
return val;
}
static void mpc512x_clk_preset_data(void)
{
size_t i;
for (i = 0; i < ARRAY_SIZE(clks); i++)
clks[i] = ERR_PTR(-ENODEV);
}
/*
* - receives the "bus frequency" from the caller (that's the IPS clock
* rate, the historical source of clock information)
* - fetches the system PLL multiplier and divider values as well as the
* IPS divider value from hardware
* - determines the REF clock rate either from the XTAL/OSC spec (if
* there is a device tree node describing the oscillator) or from the
* IPS bus clock (supported for backwards compatibility, such that
* setups without XTAL/OSC specs keep working)
* - creates the "ref" clock item in the clock tree, such that
* subsequent code can create the remainder of the hierarchy (REF ->
* SYS -> CSB -> IPS) from the REF clock rate and the returned mul/div
* values
*/
static void mpc512x_clk_setup_ref_clock(struct device_node *np, int bus_freq,
int *sys_mul, int *sys_div,
int *ips_div)
{
struct clk *osc_clk;
int calc_freq;
/* fetch mul/div factors from the hardware */
*sys_mul = get_spmf_mult();
*sys_mul *= 2; /* compensate for the fractional divider */
*sys_div = get_sys_div_x2();
*ips_div = get_bit_field(&clkregs->scfr1, 23, 3);
/* lookup the oscillator clock for its rate */
osc_clk = of_clk_get_by_name(np, "osc");
/*
* either descend from OSC to REF (and in bypassing verify the
* IPS rate), or backtrack from IPS and multiplier values that
* were fetched from hardware to REF and thus to the OSC value
*
* in either case the REF clock gets created here and the
* remainder of the clock tree can get spanned from there
*/
if (!IS_ERR(osc_clk)) {
clks[MPC512x_CLK_REF] = mpc512x_clk_factor("ref", "osc", 1, 1);
calc_freq = clk_get_rate(clks[MPC512x_CLK_REF]);
calc_freq *= *sys_mul;
calc_freq /= *sys_div;
calc_freq /= 2;
calc_freq /= *ips_div;
if (bus_freq && calc_freq != bus_freq)
pr_warn("calc rate %d != OF spec %d\n",
calc_freq, bus_freq);
} else {
calc_freq = bus_freq; /* start with IPS */
calc_freq *= *ips_div; /* IPS -> CSB */
calc_freq *= 2; /* CSB -> SYS */
calc_freq *= *sys_div; /* SYS -> PLL out */
calc_freq /= *sys_mul; /* PLL out -> REF == OSC */
clks[MPC512x_CLK_REF] = mpc512x_clk_fixed("ref", calc_freq);
}
}
/* MCLK helpers {{{ */
/*
* helper code for the MCLK subtree setup
*
* the overview in section 5.2.4 of the MPC5121e Reference Manual rev4
* suggests that all instances of the "PSC clock generation" are equal,
* and that one might re-use the PSC setup for MSCAN clock generation
* (section 5.2.5) as well, at least the logic if not the data for
* description
*
* the details (starting at page 5-20) show differences in the specific
* inputs of the first mux stage ("can clk in", "spdif tx"), and the
* factual non-availability of the second mux stage (it's present yet
* only one input is valid)
*
* the MSCAN clock related registers (starting at page 5-35) all
* reference "spdif clk" at the first mux stage and don't mention any
* "can clk" at all, which somehow is unexpected
*
* TODO re-check the document, and clarify whether the RM is correct in
* the overview or in the details, and whether the difference is a
* clipboard induced error or results from chip revisions
*
* it turns out that the RM rev4 as of 2012-06 talks about "can" for the
* PSCs while RM rev3 as of 2008-10 talks about "spdif", so I guess that
* first a doc update is required which better reflects reality in the
* SoC before the implementation should follow while no questions remain
*/
/*
* note that this declaration raises a checkpatch warning, but
* it's the very data type dictated by <linux/clk-provider.h>,
* "fixing" this warning will break compilation
*/
static const char *parent_names_mux0_spdif[] = {
"sys", "ref", "psc-mclk-in", "spdif-tx",
};
static const char *parent_names_mux0_canin[] = {
"sys", "ref", "psc-mclk-in", "can-clk-in",
};
enum mclk_type {
MCLK_TYPE_PSC,
MCLK_TYPE_MSCAN,
MCLK_TYPE_SPDIF,
MCLK_TYPE_OUTCLK,
};
struct mclk_setup_data {
enum mclk_type type;
bool has_mclk1;
const char *name_mux0;
const char *name_en0;
const char *name_div0;
const char *parent_names_mux1[2];
const char *name_mclk;
};
#define MCLK_SETUP_DATA_PSC(id) { \
MCLK_TYPE_PSC, 0, \
"psc" #id "-mux0", \
"psc" #id "-en0", \
"psc" #id "_mclk_div", \
{ "psc" #id "_mclk_div", "dummy", }, \
"psc" #id "_mclk", \
}
#define MCLK_SETUP_DATA_MSCAN(id) { \
MCLK_TYPE_MSCAN, 0, \
"mscan" #id "-mux0", \
"mscan" #id "-en0", \
"mscan" #id "_mclk_div", \
{ "mscan" #id "_mclk_div", "dummy", }, \
"mscan" #id "_mclk", \
}
#define MCLK_SETUP_DATA_SPDIF { \
MCLK_TYPE_SPDIF, 1, \
"spdif-mux0", \
"spdif-en0", \
"spdif_mclk_div", \
{ "spdif_mclk_div", "spdif-rx", }, \
"spdif_mclk", \
}
#define MCLK_SETUP_DATA_OUTCLK(id) { \
MCLK_TYPE_OUTCLK, 0, \
"out" #id "-mux0", \
"out" #id "-en0", \
"out" #id "_mclk_div", \
{ "out" #id "_mclk_div", "dummy", }, \
"out" #id "_clk", \
}
static struct mclk_setup_data mclk_psc_data[] = {
MCLK_SETUP_DATA_PSC(0),
MCLK_SETUP_DATA_PSC(1),
MCLK_SETUP_DATA_PSC(2),
MCLK_SETUP_DATA_PSC(3),
MCLK_SETUP_DATA_PSC(4),
MCLK_SETUP_DATA_PSC(5),
MCLK_SETUP_DATA_PSC(6),
MCLK_SETUP_DATA_PSC(7),
MCLK_SETUP_DATA_PSC(8),
MCLK_SETUP_DATA_PSC(9),
MCLK_SETUP_DATA_PSC(10),
MCLK_SETUP_DATA_PSC(11),
};
static struct mclk_setup_data mclk_mscan_data[] = {
MCLK_SETUP_DATA_MSCAN(0),
MCLK_SETUP_DATA_MSCAN(1),
MCLK_SETUP_DATA_MSCAN(2),
MCLK_SETUP_DATA_MSCAN(3),
};
static struct mclk_setup_data mclk_spdif_data[] = {
MCLK_SETUP_DATA_SPDIF,
};
static struct mclk_setup_data mclk_outclk_data[] = {
MCLK_SETUP_DATA_OUTCLK(0),
MCLK_SETUP_DATA_OUTCLK(1),
MCLK_SETUP_DATA_OUTCLK(2),
MCLK_SETUP_DATA_OUTCLK(3),
};
/* setup the MCLK clock subtree of an individual PSC/MSCAN/SPDIF */
static void mpc512x_clk_setup_mclk(struct mclk_setup_data *entry, size_t idx)
{
size_t clks_idx_pub, clks_idx_int;
u32 __iomem *mccr_reg; /* MCLK control register (mux, en, div) */
int div;
/* derive a few parameters from the component type and index */
switch (entry->type) {
case MCLK_TYPE_PSC:
clks_idx_pub = MPC512x_CLK_PSC0_MCLK + idx;
clks_idx_int = MPC512x_CLK_MCLKS_FIRST
+ (idx) * MCLK_MAX_IDX;
mccr_reg = &clkregs->psc_ccr[idx];
break;
case MCLK_TYPE_MSCAN:
clks_idx_pub = MPC512x_CLK_MSCAN0_MCLK + idx;
clks_idx_int = MPC512x_CLK_MCLKS_FIRST
+ (NR_PSCS + idx) * MCLK_MAX_IDX;
mccr_reg = &clkregs->mscan_ccr[idx];
break;
case MCLK_TYPE_SPDIF:
clks_idx_pub = MPC512x_CLK_SPDIF_MCLK;
clks_idx_int = MPC512x_CLK_MCLKS_FIRST
+ (NR_PSCS + NR_MSCANS) * MCLK_MAX_IDX;
mccr_reg = &clkregs->spccr;
break;
case MCLK_TYPE_OUTCLK:
clks_idx_pub = MPC512x_CLK_OUT0_CLK + idx;
clks_idx_int = MPC512x_CLK_MCLKS_FIRST
+ (NR_PSCS + NR_MSCANS + NR_SPDIFS + idx)
* MCLK_MAX_IDX;
mccr_reg = &clkregs->out_ccr[idx];
break;
default:
return;
}
/*
* this was grabbed from the PPC_CLOCK implementation, which
* enforced a specific MCLK divider while the clock was gated
* during setup (that's a documented hardware requirement)
*
* the PPC_CLOCK implementation might even have violated the
* "MCLK <= IPS" constraint, the fixed divider value of 1
* results in a divider of 2 and thus MCLK = SYS/2 which equals
* CSB which is greater than IPS; the serial port setup may have
* adjusted the divider which the clock setup might have left in
* an undesirable state
*
* initial setup is:
* - MCLK 0 from SYS
* - MCLK DIV such to not exceed the IPS clock
* - MCLK 0 enabled
* - MCLK 1 from MCLK DIV
*/
div = clk_get_rate(clks[MPC512x_CLK_SYS]);
div /= clk_get_rate(clks[MPC512x_CLK_IPS]);
out_be32(mccr_reg, (0 << 16));
out_be32(mccr_reg, (0 << 16) | ((div - 1) << 17));
out_be32(mccr_reg, (1 << 16) | ((div - 1) << 17));
/*
* create the 'struct clk' items of the MCLK's clock subtree
*
* note that by design we always create all nodes and won't take
* shortcuts here, because
* - the "internal" MCLK_DIV and MCLK_OUT signal in turn are
* selectable inputs to the CFM while those who "actually use"
* the PSC/MSCAN/SPDIF (serial drivers et al) need the MCLK
* for their bitrate
* - in the absence of "aliases" for clocks we need to create
* individial 'struct clk' items for whatever might get
* referenced or looked up, even if several of those items are
* identical from the logical POV (their rate value)
* - for easier future maintenance and for better reflection of
* the SoC's documentation, it appears appropriate to generate
* clock items even for those muxers which actually are NOPs
* (those with two inputs of which one is reserved)
*/
clks[clks_idx_int + MCLK_IDX_MUX0] = mpc512x_clk_muxed(
entry->name_mux0,
soc_has_mclk_mux0_canin()
? &parent_names_mux0_canin[0]
: &parent_names_mux0_spdif[0],
ARRAY_SIZE(parent_names_mux0_spdif),
mccr_reg, 14, 2);
clks[clks_idx_int + MCLK_IDX_EN0] = mpc512x_clk_gated(
entry->name_en0, entry->name_mux0,
mccr_reg, 16);
clks[clks_idx_int + MCLK_IDX_DIV0] = mpc512x_clk_divider(
entry->name_div0,
entry->name_en0, CLK_SET_RATE_GATE,
mccr_reg, 17, 15, 0);
if (entry->has_mclk1) {
clks[clks_idx_pub] = mpc512x_clk_muxed(
entry->name_mclk,
&entry->parent_names_mux1[0],
ARRAY_SIZE(entry->parent_names_mux1),
mccr_reg, 7, 1);
} else {
clks[clks_idx_pub] = mpc512x_clk_factor(
entry->name_mclk,
entry->parent_names_mux1[0],
1, 1);
}
}
/* }}} MCLK helpers */
static void mpc512x_clk_setup_clock_tree(struct device_node *np, int busfreq)
{
int sys_mul, sys_div, ips_div;
int mul, div;
size_t mclk_idx;
int freq;
/*
* developer's notes:
* - consider whether to handle clocks which have both gates and
* dividers via intermediates or by means of composites
* - fractional dividers appear to not map well to composites
* since they can be seen as a fixed multiplier and an
* adjustable divider, while composites can only combine at
* most one of a mux, div, and gate each into one 'struct clk'
* item
* - PSC/MSCAN/SPDIF clock generation OTOH already is very
* specific and cannot get mapped to composites (at least not
* a single one, maybe two of them, but then some of these
* intermediate clock signals get referenced elsewhere (e.g.
* in the clock frequency measurement, CFM) and thus need
* publicly available names
* - the current source layout appropriately reflects the
* hardware setup, and it works, so it's questionable whether
* further changes will result in big enough a benefit
*/
/* regardless of whether XTAL/OSC exists, have REF created */
mpc512x_clk_setup_ref_clock(np, busfreq, &sys_mul, &sys_div, &ips_div);
/* now setup the REF -> SYS -> CSB -> IPS hierarchy */
clks[MPC512x_CLK_SYS] = mpc512x_clk_factor("sys", "ref",
sys_mul, sys_div);
clks[MPC512x_CLK_CSB] = mpc512x_clk_factor("csb", "sys", 1, 2);
clks[MPC512x_CLK_IPS] = mpc512x_clk_divtable("ips", "csb",
&clkregs->scfr1, 23, 3,
divtab_2346);
/* now setup anything below SYS and CSB and IPS */
clks[MPC512x_CLK_DDR_UG] = mpc512x_clk_factor("ddr-ug", "sys", 1, 2);
/*
* the Reference Manual discusses that for SDHC only even divide
* ratios are supported because clock domain synchronization
* between 'per' and 'ipg' is broken;
* keep the divider's bit 0 cleared (per reset value), and only
* allow to setup the divider's bits 7:1, which results in that
* only even divide ratios can get configured upon rate changes;
* keep the "x4" name because this bit shift hack is an internal
* implementation detail, the "fractional divider with quarters"
* semantics remains
*/
clks[MPC512x_CLK_SDHC_x4] = mpc512x_clk_factor("sdhc-x4", "csb", 2, 1);
clks[MPC512x_CLK_SDHC_UG] = mpc512x_clk_divider("sdhc-ug", "sdhc-x4", 0,
&clkregs->scfr2, 1, 7,
CLK_DIVIDER_ONE_BASED);
if (soc_has_sdhc2()) {
clks[MPC512x_CLK_SDHC2_UG] = mpc512x_clk_divider(
"sdhc2-ug", "sdhc-x4", 0, &clkregs->scfr2,
9, 7, CLK_DIVIDER_ONE_BASED);
}
clks[MPC512x_CLK_DIU_x4] = mpc512x_clk_factor("diu-x4", "csb", 4, 1);
clks[MPC512x_CLK_DIU_UG] = mpc512x_clk_divider("diu-ug", "diu-x4", 0,
&clkregs->scfr1, 0, 8,
CLK_DIVIDER_ONE_BASED);
/*
* the "power architecture PLL" was setup from data which was
* sampled from the reset config word, at this point in time the
* configuration can be considered fixed and read only (i.e. no
* longer adjustable, or no longer in need of adjustment), which
* is why we don't register a PLL here but assume fixed factors
*/
mul = get_cpmf_mult_x2();
div = 2; /* compensate for the fractional factor */
clks[MPC512x_CLK_E300] = mpc512x_clk_factor("e300", "csb", mul, div);
if (soc_has_mbx()) {
clks[MPC512x_CLK_MBX_BUS_UG] = mpc512x_clk_factor(
"mbx-bus-ug", "csb", 1, 2);
clks[MPC512x_CLK_MBX_UG] = mpc512x_clk_divtable(
"mbx-ug", "mbx-bus-ug", &clkregs->scfr1,
14, 3, divtab_1234);
clks[MPC512x_CLK_MBX_3D_UG] = mpc512x_clk_factor(
"mbx-3d-ug", "mbx-ug", 1, 1);
}
if (soc_has_pci()) {
clks[MPC512x_CLK_PCI_UG] = mpc512x_clk_divtable(
"pci-ug", "csb", &clkregs->scfr1,
20, 3, divtab_2346);
}
if (soc_has_nfc_5125()) {
/*
* XXX TODO implement 5125 NFC clock setup logic,
* with high/low period counters in clkregs->scfr3,
* currently there are no users so it's ENOIMPL
*/
clks[MPC512x_CLK_NFC_UG] = ERR_PTR(-ENOTSUPP);
} else {
clks[MPC512x_CLK_NFC_UG] = mpc512x_clk_divtable(
"nfc-ug", "ips", &clkregs->scfr1,
8, 3, divtab_1234);
}
clks[MPC512x_CLK_LPC_UG] = mpc512x_clk_divtable("lpc-ug", "ips",
&clkregs->scfr1, 11, 3,
divtab_1234);
clks[MPC512x_CLK_LPC] = mpc512x_clk_gated("lpc", "lpc-ug",
&clkregs->sccr1, 30);
clks[MPC512x_CLK_NFC] = mpc512x_clk_gated("nfc", "nfc-ug",
&clkregs->sccr1, 29);
if (soc_has_pata()) {
clks[MPC512x_CLK_PATA] = mpc512x_clk_gated(
"pata", "ips", &clkregs->sccr1, 28);
}
/* for PSCs there is a "registers" gate and a bitrate MCLK subtree */
for (mclk_idx = 0; mclk_idx < soc_max_pscnum(); mclk_idx++) {
char name[12];
snprintf(name, sizeof(name), "psc%d", mclk_idx);
clks[MPC512x_CLK_PSC0 + mclk_idx] = mpc512x_clk_gated(
name, "ips", &clkregs->sccr1, 27 - mclk_idx);
mpc512x_clk_setup_mclk(&mclk_psc_data[mclk_idx], mclk_idx);
}
clks[MPC512x_CLK_PSC_FIFO] = mpc512x_clk_gated("psc-fifo", "ips",
&clkregs->sccr1, 15);
if (soc_has_sata()) {
clks[MPC512x_CLK_SATA] = mpc512x_clk_gated(
"sata", "ips", &clkregs->sccr1, 14);
}
clks[MPC512x_CLK_FEC] = mpc512x_clk_gated("fec", "ips",
&clkregs->sccr1, 13);
if (soc_has_pci()) {
clks[MPC512x_CLK_PCI] = mpc512x_clk_gated(
"pci", "pci-ug", &clkregs->sccr1, 11);
}
clks[MPC512x_CLK_DDR] = mpc512x_clk_gated("ddr", "ddr-ug",
&clkregs->sccr1, 10);
if (soc_has_fec2()) {
clks[MPC512x_CLK_FEC2] = mpc512x_clk_gated(
"fec2", "ips", &clkregs->sccr1, 9);
}
clks[MPC512x_CLK_DIU] = mpc512x_clk_gated("diu", "diu-ug",
&clkregs->sccr2, 31);
if (soc_has_axe()) {
clks[MPC512x_CLK_AXE] = mpc512x_clk_gated(
"axe", "csb", &clkregs->sccr2, 30);
}
clks[MPC512x_CLK_MEM] = mpc512x_clk_gated("mem", "ips",
&clkregs->sccr2, 29);
clks[MPC512x_CLK_USB1] = mpc512x_clk_gated("usb1", "csb",
&clkregs->sccr2, 28);
clks[MPC512x_CLK_USB2] = mpc512x_clk_gated("usb2", "csb",
&clkregs->sccr2, 27);
clks[MPC512x_CLK_I2C] = mpc512x_clk_gated("i2c", "ips",
&clkregs->sccr2, 26);
/* MSCAN differs from PSC with just one gate for multiple components */
clks[MPC512x_CLK_BDLC] = mpc512x_clk_gated("bdlc", "ips",
&clkregs->sccr2, 25);
for (mclk_idx = 0; mclk_idx < ARRAY_SIZE(mclk_mscan_data); mclk_idx++)
mpc512x_clk_setup_mclk(&mclk_mscan_data[mclk_idx], mclk_idx);
clks[MPC512x_CLK_SDHC] = mpc512x_clk_gated("sdhc", "sdhc-ug",
&clkregs->sccr2, 24);
/* there is only one SPDIF component, which shares MCLK support code */
if (soc_has_spdif()) {
clks[MPC512x_CLK_SPDIF] = mpc512x_clk_gated(
"spdif", "ips", &clkregs->sccr2, 23);
mpc512x_clk_setup_mclk(&mclk_spdif_data[0], 0);
}
if (soc_has_mbx()) {
clks[MPC512x_CLK_MBX_BUS] = mpc512x_clk_gated(
"mbx-bus", "mbx-bus-ug", &clkregs->sccr2, 22);
clks[MPC512x_CLK_MBX] = mpc512x_clk_gated(
"mbx", "mbx-ug", &clkregs->sccr2, 21);
clks[MPC512x_CLK_MBX_3D] = mpc512x_clk_gated(
"mbx-3d", "mbx-3d-ug", &clkregs->sccr2, 20);
}
clks[MPC512x_CLK_IIM] = mpc512x_clk_gated("iim", "csb",
&clkregs->sccr2, 19);
if (soc_has_viu()) {
clks[MPC512x_CLK_VIU] = mpc512x_clk_gated(
"viu", "csb", &clkregs->sccr2, 18);
}
if (soc_has_sdhc2()) {
clks[MPC512x_CLK_SDHC2] = mpc512x_clk_gated(
"sdhc-2", "sdhc2-ug", &clkregs->sccr2, 17);
}
if (soc_has_outclk()) {
size_t idx; /* used as mclk_idx, just to trim line length */
for (idx = 0; idx < ARRAY_SIZE(mclk_outclk_data); idx++)
mpc512x_clk_setup_mclk(&mclk_outclk_data[idx], idx);
}
/*
* externally provided clocks (when implemented in hardware,
* device tree may specify values which otherwise were unknown)
*/
freq = get_freq_from_dt("psc_mclk_in");
if (!freq)
freq = 25000000;
clks[MPC512x_CLK_PSC_MCLK_IN] = mpc512x_clk_fixed("psc_mclk_in", freq);
if (soc_has_mclk_mux0_canin()) {
freq = get_freq_from_dt("can_clk_in");
clks[MPC512x_CLK_CAN_CLK_IN] = mpc512x_clk_fixed(
"can_clk_in", freq);
} else {
freq = get_freq_from_dt("spdif_tx_in");
clks[MPC512x_CLK_SPDIF_TX_IN] = mpc512x_clk_fixed(
"spdif_tx_in", freq);
freq = get_freq_from_dt("spdif_rx_in");
clks[MPC512x_CLK_SPDIF_TX_IN] = mpc512x_clk_fixed(
"spdif_rx_in", freq);
}
/* fixed frequency for AC97, always 24.567MHz */
clks[MPC512x_CLK_AC97] = mpc512x_clk_fixed("ac97", 24567000);
/*
* pre-enable those "internal" clock items which never get
* claimed by any peripheral driver, to not have the clock
* subsystem disable them late at startup
*/
clk_prepare_enable(clks[MPC512x_CLK_DUMMY]);
clk_prepare_enable(clks[MPC512x_CLK_E300]); /* PowerPC CPU */
clk_prepare_enable(clks[MPC512x_CLK_DDR]); /* DRAM */
clk_prepare_enable(clks[MPC512x_CLK_MEM]); /* SRAM */
clk_prepare_enable(clks[MPC512x_CLK_IPS]); /* SoC periph */
clk_prepare_enable(clks[MPC512x_CLK_LPC]); /* boot media */
}
/*
* registers the set of public clocks (those listed in the dt-bindings/
* header file) for OF lookups, keeps the intermediates private to us
*/
static void mpc5121_clk_register_of_provider(struct device_node *np)
{
clk_data.clks = clks;
clk_data.clk_num = MPC512x_CLK_LAST_PUBLIC + 1; /* _not_ ARRAY_SIZE() */
of_clk_add_provider(np, of_clk_src_onecell_get, &clk_data);
}
/*
* temporary support for the period of time between introduction of CCF
* support and the adjustment of peripheral drivers to OF based lookups
*/
static void mpc5121_clk_provide_migration_support(void)
{
/*
* pre-enable those clock items which are not yet appropriately
* acquired by their peripheral driver
*
* the PCI clock cannot get acquired by its peripheral driver,
* because for this platform the driver won't probe(), instead
* initialization is done from within the .setup_arch() routine
* at a point in time where the clock provider has not been
* setup yet and thus isn't available yet
*
* so we "pre-enable" the clock here, to not have the clock
* subsystem automatically disable this item in a late init call
*
* this PCI clock pre-enable workaround only applies when there
* are device tree nodes for PCI and thus the peripheral driver
* has attached to bridges, otherwise the PCI clock remains
* unused and so it gets disabled
*/
clk_prepare_enable(clks[MPC512x_CLK_PSC3_MCLK]);/* serial console */
if (of_find_compatible_node(NULL, "pci", "fsl,mpc5121-pci"))
clk_prepare_enable(clks[MPC512x_CLK_PCI]);
}
/*
* those macros are not exactly pretty, but they encapsulate a lot
* of copy'n'paste heavy code which is even more ugly, and reduce
* the potential for inconsistencies in those many code copies
*/
#define FOR_NODES(compatname) \
for_each_compatible_node(np, NULL, compatname)
#define NODE_PREP do { \
of_address_to_resource(np, 0, &res); \
snprintf(devname, sizeof(devname), "%08x.%s", res.start, np->name); \
} while (0)
#define NODE_CHK(clkname, clkitem, regnode, regflag) do { \
struct clk *clk; \
clk = of_clk_get_by_name(np, clkname); \
if (IS_ERR(clk)) { \
clk = clkitem; \
clk_register_clkdev(clk, clkname, devname); \
if (regnode) \
clk_register_clkdev(clk, clkname, np->name); \
did_register |= DID_REG_ ## regflag; \
pr_debug("clock alias name '%s' for dev '%s' pointer %p\n", \
clkname, devname, clk); \
} else { \
clk_put(clk); \
} \
} while (0)
/*
* register source code provided fallback results for clock lookups,
* these get consulted when OF based clock lookup fails (that is in the
* case of not yet adjusted device tree data, where clock related specs
* are missing)
*/
static void mpc5121_clk_provide_backwards_compat(void)
{
enum did_reg_flags {
DID_REG_PSC = BIT(0),
DID_REG_PSCFIFO = BIT(1),
DID_REG_NFC = BIT(2),
DID_REG_CAN = BIT(3),
DID_REG_I2C = BIT(4),
DID_REG_DIU = BIT(5),
DID_REG_VIU = BIT(6),
DID_REG_FEC = BIT(7),
DID_REG_USB = BIT(8),
DID_REG_PATA = BIT(9),
};
int did_register;
struct device_node *np;
struct resource res;
int idx;
char devname[32];
did_register = 0;
FOR_NODES(mpc512x_select_psc_compat()) {
NODE_PREP;
idx = (res.start >> 8) & 0xf;
NODE_CHK("ipg", clks[MPC512x_CLK_PSC0 + idx], 0, PSC);
NODE_CHK("mclk", clks[MPC512x_CLK_PSC0_MCLK + idx], 0, PSC);
}
FOR_NODES("fsl,mpc5121-psc-fifo") {
NODE_PREP;
NODE_CHK("ipg", clks[MPC512x_CLK_PSC_FIFO], 1, PSCFIFO);
}
FOR_NODES("fsl,mpc5121-nfc") {
NODE_PREP;
NODE_CHK("ipg", clks[MPC512x_CLK_NFC], 0, NFC);
}
FOR_NODES("fsl,mpc5121-mscan") {
NODE_PREP;
idx = 0;
idx += (res.start & 0x2000) ? 2 : 0;
idx += (res.start & 0x0080) ? 1 : 0;
NODE_CHK("ipg", clks[MPC512x_CLK_BDLC], 0, CAN);
NODE_CHK("mclk", clks[MPC512x_CLK_MSCAN0_MCLK + idx], 0, CAN);
}
/*
* do register the 'ips', 'sys', and 'ref' names globally
* instead of inside each individual CAN node, as there is no
* potential for a name conflict (in contrast to 'ipg' and 'mclk')
*/
if (did_register & DID_REG_CAN) {
clk_register_clkdev(clks[MPC512x_CLK_IPS], "ips", NULL);
clk_register_clkdev(clks[MPC512x_CLK_SYS], "sys", NULL);
clk_register_clkdev(clks[MPC512x_CLK_REF], "ref", NULL);
}
FOR_NODES("fsl,mpc5121-i2c") {
NODE_PREP;
NODE_CHK("ipg", clks[MPC512x_CLK_I2C], 0, I2C);
}
/*
* workaround for the fact that the I2C driver does an "anonymous"
* lookup (NULL name spec, which yields the first clock spec) for
* which we cannot register an alias -- a _global_ 'ipg' alias that
* is not bound to any device name and returns the I2C clock item
* is not a good idea
*
* so we have the lookup in the peripheral driver fail, which is
* silent and non-fatal, and pre-enable the clock item here such
* that register access is possible
*
* see commit b3bfce2b "i2c: mpc: cleanup clock API use" for
* details, adjusting s/NULL/"ipg"/ in i2c-mpc.c would make this
* workaround obsolete
*/
if (did_register & DID_REG_I2C)
clk_prepare_enable(clks[MPC512x_CLK_I2C]);
FOR_NODES("fsl,mpc5121-diu") {
NODE_PREP;
NODE_CHK("ipg", clks[MPC512x_CLK_DIU], 1, DIU);
}
FOR_NODES("fsl,mpc5121-viu") {
NODE_PREP;
NODE_CHK("ipg", clks[MPC512x_CLK_VIU], 0, VIU);
}
/*
* note that 2771399a "fs_enet: cleanup clock API use" did use the
* "per" string for the clock lookup in contrast to the "ipg" name
* which most other nodes are using -- this is not a fatal thing
* but just something to keep in mind when doing compatibility
* registration, it's a non-issue with up-to-date device tree data
*/
FOR_NODES("fsl,mpc5121-fec") {
NODE_PREP;
NODE_CHK("per", clks[MPC512x_CLK_FEC], 0, FEC);
}
FOR_NODES("fsl,mpc5121-fec-mdio") {
NODE_PREP;
NODE_CHK("per", clks[MPC512x_CLK_FEC], 0, FEC);
}
/*
* MPC5125 has two FECs: FEC1 at 0x2800, FEC2 at 0x4800;
* the clock items don't "form an array" since FEC2 was
* added only later and was not allowed to shift all other
* clock item indices, so the numbers aren't adjacent
*/
FOR_NODES("fsl,mpc5125-fec") {
NODE_PREP;
if (res.start & 0x4000)
idx = MPC512x_CLK_FEC2;
else
idx = MPC512x_CLK_FEC;
NODE_CHK("per", clks[idx], 0, FEC);
}
FOR_NODES("fsl,mpc5121-usb2-dr") {
NODE_PREP;
idx = (res.start & 0x4000) ? 1 : 0;
NODE_CHK("ipg", clks[MPC512x_CLK_USB1 + idx], 0, USB);
}
FOR_NODES("fsl,mpc5121-pata") {
NODE_PREP;
NODE_CHK("ipg", clks[MPC512x_CLK_PATA], 0, PATA);
}
/*
* try to collapse diagnostics into a single line of output yet
* provide a full list of what is missing, to avoid noise in the
* absence of up-to-date device tree data -- backwards
* compatibility to old DTBs is a requirement, updates may be
* desirable or preferrable but are not at all mandatory
*/
if (did_register) {
pr_notice("device tree lacks clock specs, adding fallbacks (0x%x,%s%s%s%s%s%s%s%s%s%s)\n",
did_register,
(did_register & DID_REG_PSC) ? " PSC" : "",
(did_register & DID_REG_PSCFIFO) ? " PSCFIFO" : "",
(did_register & DID_REG_NFC) ? " NFC" : "",
(did_register & DID_REG_CAN) ? " CAN" : "",
(did_register & DID_REG_I2C) ? " I2C" : "",
(did_register & DID_REG_DIU) ? " DIU" : "",
(did_register & DID_REG_VIU) ? " VIU" : "",
(did_register & DID_REG_FEC) ? " FEC" : "",
(did_register & DID_REG_USB) ? " USB" : "",
(did_register & DID_REG_PATA) ? " PATA" : "");
} else {
pr_debug("device tree has clock specs, no fallbacks added\n");
}
}
/*
* The "fixed-clock" nodes (which includes the oscillator node if the board's
* DT provides one) has already been scanned by the of_clk_init() in
* time_init().
*/
int __init mpc5121_clk_init(void)
{
struct device_node *clk_np;
int busfreq;
/* map the clock control registers */
clk_np = of_find_compatible_node(NULL, NULL, "fsl,mpc5121-clock");
if (!clk_np)
return -ENODEV;
clkregs = of_iomap(clk_np, 0);
WARN_ON(!clkregs);
/* determine the SoC variant we run on */
mpc512x_clk_determine_soc();
/* invalidate all not yet registered clock slots */
mpc512x_clk_preset_data();
/*
* add a dummy clock for those situations where a clock spec is
* required yet no real clock is involved
*/
clks[MPC512x_CLK_DUMMY] = mpc512x_clk_fixed("dummy", 0);
/*
* have all the real nodes in the clock tree populated from REF
* down to all leaves, either starting from the OSC node or from
* a REF root that was created from the IPS bus clock input
*/
busfreq = get_freq_from_dt("bus-frequency");
mpc512x_clk_setup_clock_tree(clk_np, busfreq);
/* register as an OF clock provider */
mpc5121_clk_register_of_provider(clk_np);
/*
* unbreak not yet adjusted peripheral drivers during migration
* towards fully operational common clock support, and allow
* operation in the absence of clock related device tree specs
*/
mpc5121_clk_provide_migration_support();
mpc5121_clk_provide_backwards_compat();
return 0;
}
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