u-boot/drivers/clk/mpc83xx_clk.c

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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2017
* Mario Six, Guntermann & Drunck GmbH, mario.six@gdsys.cc
*/
#include <common.h>
#include <clk-uclass.h>
#include <dm.h>
#include <dm/lists.h>
#include <dt-bindings/clk/mpc83xx-clk.h>
#include <asm/arch/soc.h>
#include "mpc83xx_clk.h"
DECLARE_GLOBAL_DATA_PTR;
/**
* struct mpc83xx_clk_priv - Private data structure for the MPC83xx clock
* driver
* @speed: Array containing the speed values of all system clocks (initialized
* once, then only read back)
*/
struct mpc83xx_clk_priv {
u32 speed[MPC83XX_CLK_COUNT];
};
/**
* is_clk_valid() - Check if clock ID is valid for given clock device
* @clk: The clock device for which to check a clock ID
* @id: The clock ID to check
*
* Return: true if clock ID is valid for clock device, false if not
*/
static inline bool is_clk_valid(struct udevice *clk, int id)
{
ulong type = dev_get_driver_data(clk);
switch (id) {
case MPC83XX_CLK_MEM:
return true;
case MPC83XX_CLK_MEM_SEC:
return type == SOC_MPC8360;
case MPC83XX_CLK_ENC:
return (type == SOC_MPC8308) || (type == SOC_MPC8309);
case MPC83XX_CLK_I2C1:
return true;
case MPC83XX_CLK_TDM:
return type == SOC_MPC8315;
case MPC83XX_CLK_SDHC:
return mpc83xx_has_sdhc(type);
case MPC83XX_CLK_TSEC1:
case MPC83XX_CLK_TSEC2:
return mpc83xx_has_tsec(type);
case MPC83XX_CLK_USBDR:
return type == SOC_MPC8360;
case MPC83XX_CLK_USBMPH:
return type == SOC_MPC8349;
case MPC83XX_CLK_PCIEXP1:
return mpc83xx_has_pcie1(type);
case MPC83XX_CLK_PCIEXP2:
return mpc83xx_has_pcie2(type);
case MPC83XX_CLK_SATA:
return mpc83xx_has_sata(type);
case MPC83XX_CLK_DMAC:
return (type == SOC_MPC8308) || (type == SOC_MPC8309);
case MPC83XX_CLK_PCI:
return mpc83xx_has_pci(type);
case MPC83XX_CLK_CSB:
return true;
case MPC83XX_CLK_I2C2:
return mpc83xx_has_second_i2c(type);
case MPC83XX_CLK_QE:
case MPC83XX_CLK_BRG:
return mpc83xx_has_quicc_engine(type) && (type != SOC_MPC8309);
case MPC83XX_CLK_LCLK:
case MPC83XX_CLK_LBIU:
case MPC83XX_CLK_CORE:
return true;
}
return false;
}
/**
* init_single_clk() - Initialize a clock with a given ID
* @dev: The clock device for which to initialize the clock
* @clk: The clock ID
*
* The clock speed is read from the hardware's registers, and stored in the
* private data structure of the driver. From there it is only retrieved, and
* not set.
*
* Return: 0 if OK, -ve on error
*/
static int init_single_clk(struct udevice *dev, int clk)
{
struct mpc83xx_clk_priv *priv = dev_get_priv(dev);
immap_t *im = (immap_t *)CONFIG_SYS_IMMR;
ulong type = dev_get_driver_data(dev);
struct clk_mode mode;
ulong mask;
u32 csb_clk = get_csb_clk(im);
int ret;
ret = retrieve_mode(clk, type, &mode);
if (ret) {
debug("%s: Could not retrieve mode for clk %d (ret = %d)\n",
dev->name, clk, ret);
return ret;
}
if (mode.type == TYPE_INVALID) {
debug("%s: clock %d invalid\n", dev->name, clk);
return -EINVAL;
}
if (mode.type == TYPE_SCCR_STANDARD) {
mask = GENMASK(31 - mode.low, 31 - mode.high);
switch (sccr_field(im, mask)) {
case 0:
priv->speed[clk] = 0;
break;
case 1:
priv->speed[clk] = csb_clk;
break;
case 2:
priv->speed[clk] = csb_clk / 2;
break;
case 3:
priv->speed[clk] = csb_clk / 3;
break;
default:
priv->speed[clk] = 0;
}
return 0;
}
if (mode.type == TYPE_SPMR_DIRECT_MULTIPLY) {
mask = GENMASK(31 - mode.low, 31 - mode.high);
priv->speed[clk] = csb_clk * (1 + sccr_field(im, mask));
return 0;
}
if (clk == MPC83XX_CLK_CSB || clk == MPC83XX_CLK_I2C2) {
priv->speed[clk] = csb_clk; /* i2c-2 clk is equal to csb clk */
return 0;
}
if (clk == MPC83XX_CLK_QE || clk == MPC83XX_CLK_BRG) {
u32 pci_sync_in = get_pci_sync_in(im);
u32 qepmf = spmr_field(im, SPMR_CEPMF);
u32 qepdf = spmr_field(im, SPMR_CEPDF);
u32 qe_clk = (pci_sync_in * qepmf) / (1 + qepdf);
if (clk == MPC83XX_CLK_QE)
priv->speed[clk] = qe_clk;
else
priv->speed[clk] = qe_clk / 2;
return 0;
}
if (clk == MPC83XX_CLK_LCLK || clk == MPC83XX_CLK_LBIU) {
u32 lbiu_clk = csb_clk *
(1 + spmr_field(im, SPMR_LBIUCM));
u32 clkdiv = lcrr_field(im, LCRR_CLKDIV);
if (clk == MPC83XX_CLK_LBIU)
priv->speed[clk] = lbiu_clk;
switch (clkdiv) {
case 2:
case 4:
case 8:
priv->speed[clk] = lbiu_clk / clkdiv;
break;
default:
/* unknown lcrr */
priv->speed[clk] = 0;
}
return 0;
}
if (clk == MPC83XX_CLK_CORE) {
u8 corepll = spmr_field(im, SPMR_COREPLL);
u32 corecnf_tab_index = ((corepll & 0x1F) << 2) |
((corepll & 0x60) >> 5);
if (corecnf_tab_index > (ARRAY_SIZE(corecnf_tab))) {
debug("%s: Core configuration index %02x too high; possible wrong value",
dev->name, corecnf_tab_index);
return -EINVAL;
}
switch (corecnf_tab[corecnf_tab_index].core_csb_ratio) {
case RAT_BYP:
case RAT_1_TO_1:
priv->speed[clk] = csb_clk;
break;
case RAT_1_5_TO_1:
priv->speed[clk] = (3 * csb_clk) / 2;
break;
case RAT_2_TO_1:
priv->speed[clk] = 2 * csb_clk;
break;
case RAT_2_5_TO_1:
priv->speed[clk] = (5 * csb_clk) / 2;
break;
case RAT_3_TO_1:
priv->speed[clk] = 3 * csb_clk;
break;
default:
/* unknown core to csb ratio */
priv->speed[clk] = 0;
}
return 0;
}
/* Unknown clk value -> error */
debug("%s: clock %d invalid\n", dev->name, clk);
return -EINVAL;
}
/**
* init_all_clks() - Initialize all clocks of a clock device
* @dev: The clock device whose clocks should be initialized
*
* Return: 0 if OK, -ve on error
*/
static inline int init_all_clks(struct udevice *dev)
{
int i;
for (i = 0; i < MPC83XX_CLK_COUNT; i++) {
int ret;
if (!is_clk_valid(dev, i))
continue;
ret = init_single_clk(dev, i);
if (ret) {
debug("%s: Failed to initialize %s clock\n",
dev->name, names[i]);
return ret;
}
}
return 0;
}
static int mpc83xx_clk_request(struct clk *clock)
{
/* Reject requests of clocks that are not available */
if (is_clk_valid(clock->dev, clock->id))
return 0;
else
return -ENODEV;
}
static ulong mpc83xx_clk_get_rate(struct clk *clk)
{
struct mpc83xx_clk_priv *priv = dev_get_priv(clk->dev);
if (clk->id >= MPC83XX_CLK_COUNT) {
debug("%s: clock index %lu invalid\n", __func__, clk->id);
return 0;
}
return priv->speed[clk->id];
}
static int mpc83xx_clk_enable(struct clk *clk)
{
/* MPC83xx clocks are always enabled */
return 0;
}
int get_clocks(void)
{
/* Empty implementation to keep the prototype in common.h happy */
return 0;
}
int get_serial_clock(void)
{
struct mpc83xx_clk_priv *priv;
struct udevice *clk;
int ret;
ret = uclass_first_device_err(UCLASS_CLK, &clk);
if (ret) {
debug("%s: Could not get clock device\n", __func__);
return ret;
}
priv = dev_get_priv(clk);
return priv->speed[MPC83XX_CLK_CSB];
}
const struct clk_ops mpc83xx_clk_ops = {
.request = mpc83xx_clk_request,
.get_rate = mpc83xx_clk_get_rate,
.enable = mpc83xx_clk_enable,
};
static const struct udevice_id mpc83xx_clk_match[] = {
{ .compatible = "fsl,mpc8308-clk", .data = SOC_MPC8308 },
{ .compatible = "fsl,mpc8309-clk", .data = SOC_MPC8309 },
{ .compatible = "fsl,mpc8313-clk", .data = SOC_MPC8313 },
{ .compatible = "fsl,mpc8315-clk", .data = SOC_MPC8315 },
{ .compatible = "fsl,mpc832x-clk", .data = SOC_MPC832X },
{ .compatible = "fsl,mpc8349-clk", .data = SOC_MPC8349 },
{ .compatible = "fsl,mpc8360-clk", .data = SOC_MPC8360 },
{ .compatible = "fsl,mpc8379-clk", .data = SOC_MPC8379 },
{ /* sentinel */ }
};
static int mpc83xx_clk_probe(struct udevice *dev)
{
struct mpc83xx_clk_priv *priv = dev_get_priv(dev);
ulong type;
int ret;
ret = init_all_clks(dev);
if (ret) {
debug("%s: Could not initialize all clocks (ret = %d)\n",
dev->name, ret);
return ret;
}
type = dev_get_driver_data(dev);
if (mpc83xx_has_sdhc(type))
gd->arch.sdhc_clk = priv->speed[MPC83XX_CLK_SDHC];
gd->arch.core_clk = priv->speed[MPC83XX_CLK_CORE];
gd->arch.i2c1_clk = priv->speed[MPC83XX_CLK_I2C1];
if (mpc83xx_has_second_i2c(type))
gd->arch.i2c2_clk = priv->speed[MPC83XX_CLK_I2C2];
gd->mem_clk = priv->speed[MPC83XX_CLK_MEM];
if (mpc83xx_has_pci(type))
gd->pci_clk = priv->speed[MPC83XX_CLK_PCI];
gd->cpu_clk = priv->speed[MPC83XX_CLK_CORE];
gd->bus_clk = priv->speed[MPC83XX_CLK_CSB];
return 0;
}
static int mpc83xx_clk_bind(struct udevice *dev)
{
int ret;
struct udevice *sys_child;
/*
* Since there is no corresponding device tree entry, and since the
* clock driver has to be present in either case, bind the sysreset
* driver here.
*/
ret = device_bind_driver(dev, "mpc83xx_sysreset", "sysreset",
&sys_child);
if (ret)
debug("%s: No sysreset driver: ret=%d\n",
dev->name, ret);
return 0;
}
U_BOOT_DRIVER(mpc83xx_clk) = {
.name = "mpc83xx_clk",
.id = UCLASS_CLK,
.of_match = mpc83xx_clk_match,
.ops = &mpc83xx_clk_ops,
.probe = mpc83xx_clk_probe,
.priv_auto_alloc_size = sizeof(struct mpc83xx_clk_priv),
.bind = mpc83xx_clk_bind,
};
static int do_clocks(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
int i;
char buf[32];
struct udevice *clk;
int ret;
struct mpc83xx_clk_priv *priv;
ret = uclass_first_device_err(UCLASS_CLK, &clk);
if (ret) {
debug("%s: Could not get clock device\n", __func__);
return ret;
}
for (i = 0; i < MPC83XX_CLK_COUNT; i++) {
if (!is_clk_valid(clk, i))
continue;
priv = dev_get_priv(clk);
printf("%s = %s MHz\n", names[i], strmhz(buf, priv->speed[i]));
}
return 0;
}
U_BOOT_CMD(clocks, 1, 1, do_clocks,
"display values of SoC's clocks",
""
);