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kernel/drivers/net/wan/framer/pef2256/pef2256.c

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// SPDX-License-Identifier: GPL-2.0
/*
* PEF2256 also known as FALC56 driver
*
* Copyright 2023 CS GROUP France
*
* Author: Herve Codina <herve.codina@bootlin.com>
*/
#include <linux/framer/pef2256.h>
#include <linux/clk.h>
#include <linux/framer/framer-provider.h>
#include <linux/gpio/consumer.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/mfd/core.h>
#include <linux/module.h>
#include <linux/notifier.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include "pef2256-regs.h"
enum pef2256_frame_type {
PEF2256_FRAME_E1_DOUBLEFRAME,
PEF2256_FRAME_E1_CRC4_MULTIFRAME,
PEF2256_FRAME_E1_AUTO_MULTIFRAME,
PEF2256_FRAME_T1J1_4FRAME,
PEF2256_FRAME_T1J1_12FRAME,
PEF2256_FRAME_T1J1_24FRAME,
PEF2256_FRAME_T1J1_72FRAME,
};
struct pef2256 {
struct device *dev;
struct regmap *regmap;
enum pef2256_version version;
struct clk *mclk;
struct clk *sclkr;
struct clk *sclkx;
struct gpio_desc *reset_gpio;
unsigned long sysclk_rate;
u32 data_rate;
bool is_tx_falling_edge;
bool is_subordinate;
enum pef2256_frame_type frame_type;
u8 channel_phase;
atomic_t carrier;
struct framer *framer;
};
static u8 pef2256_read8(struct pef2256 *pef2256, int offset)
{
int val;
regmap_read(pef2256->regmap, offset, &val);
return val;
}
static void pef2256_write8(struct pef2256 *pef2256, int offset, u8 val)
{
regmap_write(pef2256->regmap, offset, val);
}
static void pef2256_clrbits8(struct pef2256 *pef2256, int offset, u8 clr)
{
regmap_clear_bits(pef2256->regmap, offset, clr);
}
static void pef2256_setbits8(struct pef2256 *pef2256, int offset, u8 set)
{
regmap_set_bits(pef2256->regmap, offset, set);
}
static void pef2256_clrsetbits8(struct pef2256 *pef2256, int offset, u8 clr, u8 set)
{
regmap_update_bits(pef2256->regmap, offset, clr | set, set);
}
enum pef2256_version pef2256_get_version(struct pef2256 *pef2256)
{
enum pef2256_version version = PEF2256_VERSION_UNKNOWN;
u8 vstr, wid;
vstr = pef2256_read8(pef2256, PEF2256_VSTR);
wid = pef2256_read8(pef2256, PEF2256_WID);
switch (vstr) {
case PEF2256_VSTR_VERSION_12:
if ((wid & PEF2256_12_WID_MASK) == PEF2256_12_WID_VERSION_12)
version = PEF2256_VERSION_1_2;
break;
case PEF2256_VSTR_VERSION_2x:
switch (wid & PEF2256_2X_WID_MASK) {
case PEF2256_2X_WID_VERSION_21:
version = PEF2256_VERSION_2_1;
break;
case PEF2256_2X_WID_VERSION_22:
version = PEF2256_VERSION_2_2;
break;
}
break;
case PEF2256_VSTR_VERSION_21:
version = PEF2256_VERSION_2_1;
break;
}
if (version == PEF2256_VERSION_UNKNOWN)
dev_err(pef2256->dev, "Unknown version (0x%02x, 0x%02x)\n", vstr, wid);
return version;
}
EXPORT_SYMBOL_GPL(pef2256_get_version);
enum pef2256_gcm_config_item {
PEF2256_GCM_CONFIG_1544000 = 0,
PEF2256_GCM_CONFIG_2048000,
PEF2256_GCM_CONFIG_8192000,
PEF2256_GCM_CONFIG_10000000,
PEF2256_GCM_CONFIG_12352000,
PEF2256_GCM_CONFIG_16384000,
};
struct pef2256_gcm_config {
u8 gcm_12[6];
u8 gcm_2x[8];
};
static const struct pef2256_gcm_config pef2256_gcm_configs[] = {
[PEF2256_GCM_CONFIG_1544000] = {
.gcm_12 = {0xF0, 0x51, 0x00, 0x80, 0x00, 0x15},
.gcm_2x = {0x00, 0x15, 0x00, 0x08, 0x00, 0x3F, 0x9C, 0xDF},
},
[PEF2256_GCM_CONFIG_2048000] = {
.gcm_12 = {0x00, 0x58, 0xD2, 0xC2, 0x00, 0x10},
.gcm_2x = {0x00, 0x18, 0xFB, 0x0B, 0x00, 0x2F, 0xDB, 0xDF},
},
[PEF2256_GCM_CONFIG_8192000] = {
.gcm_12 = {0x00, 0x58, 0xD2, 0xC2, 0x03, 0x10},
.gcm_2x = {0x00, 0x18, 0xFB, 0x0B, 0x00, 0x0B, 0xDB, 0xDF},
},
[PEF2256_GCM_CONFIG_10000000] = {
.gcm_12 = {0x90, 0x51, 0x81, 0x8F, 0x04, 0x10},
.gcm_2x = {0x40, 0x1B, 0x3D, 0x0A, 0x00, 0x07, 0xC9, 0xDC},
},
[PEF2256_GCM_CONFIG_12352000] = {
.gcm_12 = {0xF0, 0x51, 0x00, 0x80, 0x07, 0x15},
.gcm_2x = {0x00, 0x19, 0x00, 0x08, 0x01, 0x0A, 0x98, 0xDA},
},
[PEF2256_GCM_CONFIG_16384000] = {
.gcm_12 = {0x00, 0x58, 0xD2, 0xC2, 0x07, 0x10},
.gcm_2x = {0x00, 0x18, 0xFB, 0x0B, 0x01, 0x0B, 0xDB, 0xDF},
},
};
static int pef2256_setup_gcm(struct pef2256 *pef2256)
{
enum pef2256_gcm_config_item item;
unsigned long mclk_rate;
const u8 *gcm;
int i, count;
mclk_rate = clk_get_rate(pef2256->mclk);
switch (mclk_rate) {
case 1544000:
item = PEF2256_GCM_CONFIG_1544000;
break;
case 2048000:
item = PEF2256_GCM_CONFIG_2048000;
break;
case 8192000:
item = PEF2256_GCM_CONFIG_8192000;
break;
case 10000000:
item = PEF2256_GCM_CONFIG_10000000;
break;
case 12352000:
item = PEF2256_GCM_CONFIG_12352000;
break;
case 16384000:
item = PEF2256_GCM_CONFIG_16384000;
break;
default:
dev_err(pef2256->dev, "Unsupported v2.x MCLK rate %lu\n", mclk_rate);
return -EINVAL;
}
BUILD_BUG_ON(item >= ARRAY_SIZE(pef2256_gcm_configs));
if (pef2256->version == PEF2256_VERSION_1_2) {
gcm = pef2256_gcm_configs[item].gcm_12;
count = ARRAY_SIZE(pef2256_gcm_configs[item].gcm_12);
} else {
gcm = pef2256_gcm_configs[item].gcm_2x;
count = ARRAY_SIZE(pef2256_gcm_configs[item].gcm_2x);
}
for (i = 0; i < count; i++)
pef2256_write8(pef2256, PEF2256_GCM(i + 1), *(gcm + i));
return 0;
}
static int pef2256_setup_e1_line(struct pef2256 *pef2256)
{
u8 fmr1, fmr2;
/* RCLK output : DPLL clock, DCO-X enabled, DCO-X internal ref clock */
pef2256_write8(pef2256, PEF2256_CMR1, 0x00);
/* SCLKR selected, SCLKX selected,
* receive synchro pulse sourced by SYPR,
* transmit synchro pulse sourced by SYPX,
* DCO-X center frequency enabled
*/
pef2256_write8(pef2256, PEF2256_CMR2, PEF2256_CMR2_DCOXC);
if (pef2256->is_subordinate) {
/* select RCLK source = 2M, disable switching from RCLK to SYNC */
pef2256_clrsetbits8(pef2256, PEF2256_CMR1, PEF2256_CMR1_RS_MASK,
PEF2256_CMR1_RS_DCOR_2048 | PEF2256_CMR1_DCS);
}
/* slave mode, local loop off, mode short-haul
* In v2.x, bit3 is a forced 1 bit in the datasheet -> Need to be set.
*/
if (pef2256->version == PEF2256_VERSION_1_2)
pef2256_write8(pef2256, PEF2256_LIM0, 0x00);
else
pef2256_write8(pef2256, PEF2256_LIM0, PEF2256_2X_LIM0_BIT3);
/* "master" mode */
if (!pef2256->is_subordinate)
pef2256_setbits8(pef2256, PEF2256_LIM0, PEF2256_LIM0_MAS);
/* analog interface selected, remote loop off */
pef2256_write8(pef2256, PEF2256_LIM1, 0x00);
/* receive input threshold = 0,21V */
if (pef2256->version == PEF2256_VERSION_1_2)
pef2256_clrsetbits8(pef2256, PEF2256_LIM1, PEF2256_12_LIM1_RIL_MASK,
PEF2256_12_LIM1_RIL_210);
else
pef2256_clrsetbits8(pef2256, PEF2256_LIM1, PEF2256_2X_LIM1_RIL_MASK,
PEF2256_2X_LIM1_RIL_210);
/* transmit pulse mask, default value from datasheet
* transmit line in normal operation
*/
if (pef2256->version == PEF2256_VERSION_1_2)
pef2256_write8(pef2256, PEF2256_XPM0, 0x7B);
else
pef2256_write8(pef2256, PEF2256_XPM0, 0x9C);
pef2256_write8(pef2256, PEF2256_XPM1, 0x03);
pef2256_write8(pef2256, PEF2256_XPM2, 0x00);
/* HDB3 coding, no alarm simulation */
pef2256_write8(pef2256, PEF2256_FMR0, PEF2256_FMR0_XC_HDB3 | PEF2256_FMR0_RC_HDB3);
/* E1, frame format, 2 Mbit/s system data rate, no AIS
* transmission to remote end or system interface, payload loop
* off, transmit remote alarm on
*/
fmr1 = 0x00;
fmr2 = PEF2256_FMR2_AXRA;
switch (pef2256->frame_type) {
case PEF2256_FRAME_E1_DOUBLEFRAME:
fmr2 |= PEF2256_FMR2_RFS_DOUBLEFRAME;
break;
case PEF2256_FRAME_E1_CRC4_MULTIFRAME:
fmr1 |= PEF2256_FMR1_XFS;
fmr2 |= PEF2256_FMR2_RFS_CRC4_MULTIFRAME;
break;
case PEF2256_FRAME_E1_AUTO_MULTIFRAME:
fmr1 |= PEF2256_FMR1_XFS;
fmr2 |= PEF2256_FMR2_RFS_AUTO_MULTIFRAME;
break;
default:
dev_err(pef2256->dev, "Unsupported frame type %d\n", pef2256->frame_type);
return -EINVAL;
}
pef2256_clrsetbits8(pef2256, PEF2256_FMR1, PEF2256_FMR1_XFS, fmr1);
pef2256_write8(pef2256, PEF2256_FMR2, fmr2);
if (!pef2256->is_subordinate) {
/* SEC input, active high */
pef2256_write8(pef2256, PEF2256_GPC1, PEF2256_GPC1_CSFP_SEC_IN_HIGH);
} else {
/* FSC output, active high */
pef2256_write8(pef2256, PEF2256_GPC1, PEF2256_GPC1_CSFP_FSC_OUT_HIGH);
}
/* SCLKR, SCLKX, RCLK configured to inputs,
* XFMS active low, CLK1 and CLK2 pin configuration
*/
pef2256_write8(pef2256, PEF2256_PC5, 0x00);
pef2256_write8(pef2256, PEF2256_PC6, 0x00);
/* port RCLK is output */
pef2256_setbits8(pef2256, PEF2256_PC5, PEF2256_PC5_CRP);
return 0;
}
static void pef2256_setup_e1_los(struct pef2256 *pef2256)
{
/* detection of LOS alarm = 176 pulses (ie (10 + 1) * 16) */
pef2256_write8(pef2256, PEF2256_PCD, 10);
/* recovery of LOS alarm = 22 pulses (ie 21 + 1) */
pef2256_write8(pef2256, PEF2256_PCR, 21);
/* E1 default for the receive slicer threshold */
pef2256_write8(pef2256, PEF2256_LIM2, PEF2256_LIM2_SLT_THR50);
if (pef2256->is_subordinate) {
/* Loop-timed */
pef2256_setbits8(pef2256, PEF2256_LIM2, PEF2256_LIM2_ELT);
}
}
static int pef2256_setup_e1_system(struct pef2256 *pef2256)
{
u8 sic1, fmr1;
/* 2.048 MHz system clocking rate, receive buffer 2 frames, transmit
* buffer bypass, data sampled and transmitted on the falling edge of
* SCLKR/X, automatic freeze signaling, data is active in the first
* channel phase
*/
pef2256_write8(pef2256, PEF2256_SIC1, 0x00);
pef2256_write8(pef2256, PEF2256_SIC2, 0x00);
pef2256_write8(pef2256, PEF2256_SIC3, 0x00);
if (pef2256->is_subordinate) {
/* transmit buffer size = 2 frames, transparent mode */
pef2256_clrsetbits8(pef2256, PEF2256_SIC1, PEF2256_SIC1_XBS_MASK,
PEF2256_SIC1_XBS_2FRAMES);
}
if (pef2256->version != PEF2256_VERSION_1_2) {
/* during inactive channel phase switch RDO/RSIG into tri-state */
pef2256_setbits8(pef2256, PEF2256_SIC3, PEF2256_SIC3_RTRI);
}
if (pef2256->is_tx_falling_edge) {
/* falling edge sync pulse transmit, rising edge sync pulse receive */
pef2256_clrsetbits8(pef2256, PEF2256_SIC3, PEF2256_SIC3_RESX, PEF2256_SIC3_RESR);
} else {
/* rising edge sync pulse transmit, falling edge sync pulse receive */
pef2256_clrsetbits8(pef2256, PEF2256_SIC3, PEF2256_SIC3_RESR, PEF2256_SIC3_RESX);
}
/* transmit offset counter (XCO10..0) = 4 */
pef2256_write8(pef2256, PEF2256_XC0, 0);
pef2256_write8(pef2256, PEF2256_XC1, 4);
/* receive offset counter (RCO10..0) = 4 */
pef2256_write8(pef2256, PEF2256_RC0, 0);
pef2256_write8(pef2256, PEF2256_RC1, 4);
/* system clock rate */
switch (pef2256->sysclk_rate) {
case 2048000:
sic1 = PEF2256_SIC1_SSC_2048;
break;
case 4096000:
sic1 = PEF2256_SIC1_SSC_4096;
break;
case 8192000:
sic1 = PEF2256_SIC1_SSC_8192;
break;
case 16384000:
sic1 = PEF2256_SIC1_SSC_16384;
break;
default:
dev_err(pef2256->dev, "Unsupported sysclk rate %lu\n", pef2256->sysclk_rate);
return -EINVAL;
}
pef2256_clrsetbits8(pef2256, PEF2256_SIC1, PEF2256_SIC1_SSC_MASK, sic1);
/* data clock rate */
switch (pef2256->data_rate) {
case 2048000:
fmr1 = PEF2256_FMR1_SSD_2048;
sic1 = PEF2256_SIC1_SSD_2048;
break;
case 4096000:
fmr1 = PEF2256_FMR1_SSD_4096;
sic1 = PEF2256_SIC1_SSD_4096;
break;
case 8192000:
fmr1 = PEF2256_FMR1_SSD_8192;
sic1 = PEF2256_SIC1_SSD_8192;
break;
case 16384000:
fmr1 = PEF2256_FMR1_SSD_16384;
sic1 = PEF2256_SIC1_SSD_16384;
break;
default:
dev_err(pef2256->dev, "Unsupported data rate %u\n", pef2256->data_rate);
return -EINVAL;
}
pef2256_clrsetbits8(pef2256, PEF2256_FMR1, PEF2256_FMR1_SSD_MASK, fmr1);
pef2256_clrsetbits8(pef2256, PEF2256_SIC1, PEF2256_SIC1_SSD_MASK, sic1);
/* channel phase */
pef2256_clrsetbits8(pef2256, PEF2256_SIC2, PEF2256_SIC2_SICS_MASK,
PEF2256_SIC2_SICS(pef2256->channel_phase));
return 0;
}
static void pef2256_setup_e1_signaling(struct pef2256 *pef2256)
{
/* All bits of the transmitted service word are cleared */
pef2256_write8(pef2256, PEF2256_XSW, PEF2256_XSW_XY(0x1F));
/* CAS disabled and clear spare bit values */
pef2256_write8(pef2256, PEF2256_XSP, 0x00);
if (pef2256->is_subordinate) {
/* transparent mode */
pef2256_setbits8(pef2256, PEF2256_XSW, PEF2256_XSW_XTM);
}
/* Si-Bit, Spare bit For International, FAS word */
pef2256_setbits8(pef2256, PEF2256_XSW, PEF2256_XSW_XSIS);
pef2256_setbits8(pef2256, PEF2256_XSP, PEF2256_XSP_XSIF);
/* no transparent mode active */
pef2256_write8(pef2256, PEF2256_TSWM, 0x00);
}
static void pef2256_setup_e1_errors(struct pef2256 *pef2256)
{
/* error counter latched every 1s */
pef2256_setbits8(pef2256, PEF2256_FMR1, PEF2256_FMR1_ECM);
/* error counter mode COFA */
pef2256_setbits8(pef2256, PEF2256_GCR, PEF2256_GCR_ECMC);
/* errors in service words have no influence */
pef2256_setbits8(pef2256, PEF2256_RC0, PEF2256_RC0_SWD);
/* 4 consecutive incorrect FAS causes loss of sync */
pef2256_setbits8(pef2256, PEF2256_RC0, PEF2256_RC0_ASY4);
}
static int pef2256_setup_e1(struct pef2256 *pef2256)
{
int ret;
/* Setup, Master clocking mode (GCM8..1) */
ret = pef2256_setup_gcm(pef2256);
if (ret)
return ret;
/* Select E1 mode */
pef2256_write8(pef2256, PEF2256_FMR1, 0x00);
/* internal second timer, power on */
pef2256_write8(pef2256, PEF2256_GCR, 0x00);
/* Setup line interface */
ret = pef2256_setup_e1_line(pef2256);
if (ret)
return ret;
/* Setup Loss-of-signal detection and recovery */
pef2256_setup_e1_los(pef2256);
/* Setup system interface */
ret = pef2256_setup_e1_system(pef2256);
if (ret)
return ret;
/* Setup signaling */
pef2256_setup_e1_signaling(pef2256);
/* Setup errors counters and condition */
pef2256_setup_e1_errors(pef2256);
/* status changed interrupt at both up and down */
pef2256_setbits8(pef2256, PEF2256_GCR, PEF2256_GCR_SCI);
/* Clear any ISR2 pending interrupts and unmask needed interrupts */
pef2256_read8(pef2256, PEF2256_ISR2);
pef2256_clrbits8(pef2256, PEF2256_IMR2, PEF2256_INT2_LOS | PEF2256_INT2_AIS);
/* reset lines */
pef2256_write8(pef2256, PEF2256_CMDR, PEF2256_CMDR_RRES | PEF2256_CMDR_XRES);
return 0;
}
static void pef2256_isr_default_handler(struct pef2256 *pef2256, u8 nbr, u8 isr)
{
dev_warn_ratelimited(pef2256->dev, "ISR%u: 0x%02x not handled\n", nbr, isr);
}
static bool pef2256_is_carrier_on(struct pef2256 *pef2256)
{
u8 frs0;
frs0 = pef2256_read8(pef2256, PEF2256_FRS0);
return !(frs0 & (PEF2256_FRS0_LOS | PEF2256_FRS0_AIS));
}
static void pef2256_isr2_handler(struct pef2256 *pef2256, u8 nbr, u8 isr)
{
bool carrier;
if (isr & (PEF2256_INT2_LOS | PEF2256_INT2_AIS)) {
carrier = pef2256_is_carrier_on(pef2256);
if (atomic_xchg(&pef2256->carrier, carrier) != carrier)
framer_notify_status_change(pef2256->framer);
}
}
static irqreturn_t pef2256_irq_handler(int irq, void *priv)
{
static void (*pef2256_isr_handler[])(struct pef2256 *, u8, u8) = {
[0] = pef2256_isr_default_handler,
[1] = pef2256_isr_default_handler,
[2] = pef2256_isr2_handler,
[3] = pef2256_isr_default_handler,
[4] = pef2256_isr_default_handler,
[5] = pef2256_isr_default_handler
};
struct pef2256 *pef2256 = (struct pef2256 *)priv;
u8 gis;
u8 isr;
u8 n;
gis = pef2256_read8(pef2256, PEF2256_GIS);
for (n = 0; n < ARRAY_SIZE(pef2256_isr_handler); n++) {
if (gis & PEF2256_GIS_ISR(n)) {
isr = pef2256_read8(pef2256, PEF2256_ISR(n));
pef2256_isr_handler[n](pef2256, n, isr);
}
}
return IRQ_HANDLED;
}
static int pef2256_check_rates(struct pef2256 *pef2256, unsigned long sysclk_rate,
unsigned long data_rate)
{
unsigned long rate;
switch (sysclk_rate) {
case 2048000:
case 4096000:
case 8192000:
case 16384000:
break;
default:
dev_err(pef2256->dev, "Unsupported system clock rate %lu\n", sysclk_rate);
return -EINVAL;
}
for (rate = data_rate; rate <= data_rate * 4; rate *= 2) {
if (rate == sysclk_rate)
return 0;
}
dev_err(pef2256->dev, "Unsupported data rate %lu with system clock rate %lu\n",
data_rate, sysclk_rate);
return -EINVAL;
}
static int pef2556_of_parse(struct pef2256 *pef2256, struct device_node *np)
{
int ret;
pef2256->data_rate = 2048000;
ret = of_property_read_u32(np, "lantiq,data-rate-bps", &pef2256->data_rate);
if (ret && ret != -EINVAL) {
dev_err(pef2256->dev, "%pOF: failed to read lantiq,data-rate-bps\n", np);
return ret;
}
ret = pef2256_check_rates(pef2256, pef2256->sysclk_rate, pef2256->data_rate);
if (ret)
return ret;
pef2256->is_tx_falling_edge = of_property_read_bool(np, "lantiq,clock-falling-edge");
pef2256->channel_phase = 0;
ret = of_property_read_u8(np, "lantiq,channel-phase", &pef2256->channel_phase);
if (ret && ret != -EINVAL) {
dev_err(pef2256->dev, "%pOF: failed to read lantiq,channel-phase\n",
np);
return ret;
}
if (pef2256->channel_phase >= pef2256->sysclk_rate / pef2256->data_rate) {
dev_err(pef2256->dev, "%pOF: Invalid lantiq,channel-phase %u\n",
np, pef2256->channel_phase);
return -EINVAL;
}
return 0;
}
static const struct regmap_config pef2256_regmap_config = {
.reg_bits = 32,
.val_bits = 8,
.max_register = 0xff,
};
static const struct mfd_cell pef2256_devs[] = {
{ .name = "lantiq-pef2256-pinctrl", },
};
static int pef2256_add_audio_devices(struct pef2256 *pef2256)
{
const char *compatible = "lantiq,pef2256-codec";
struct mfd_cell *audio_devs;
struct device_node *np;
unsigned int count = 0;
unsigned int i;
int ret;
for_each_available_child_of_node(pef2256->dev->of_node, np) {
if (of_device_is_compatible(np, compatible))
count++;
}
if (!count)
return 0;
audio_devs = kcalloc(count, sizeof(*audio_devs), GFP_KERNEL);
if (!audio_devs)
return -ENOMEM;
for (i = 0; i < count; i++) {
audio_devs[i].name = "framer-codec";
audio_devs[i].of_compatible = compatible;
audio_devs[i].id = i;
}
ret = mfd_add_devices(pef2256->dev, 0, audio_devs, count, NULL, 0, NULL);
kfree(audio_devs);
return ret;
}
static int pef2256_framer_get_status(struct framer *framer, struct framer_status *status)
{
struct pef2256 *pef2256 = framer_get_drvdata(framer);
status->link_is_on = !!atomic_read(&pef2256->carrier);
return 0;
}
static int pef2256_framer_set_config(struct framer *framer, const struct framer_config *config)
{
struct pef2256 *pef2256 = framer_get_drvdata(framer);
if (config->iface != FRAMER_IFACE_E1) {
dev_err(pef2256->dev, "Only E1 line is currently supported\n");
return -EOPNOTSUPP;
}
switch (config->clock_type) {
case FRAMER_CLOCK_EXT:
pef2256->is_subordinate = true;
break;
case FRAMER_CLOCK_INT:
pef2256->is_subordinate = false;
break;
default:
return -EINVAL;
}
/* Apply the new settings */
return pef2256_setup_e1(pef2256);
}
static int pef2256_framer_get_config(struct framer *framer, struct framer_config *config)
{
struct pef2256 *pef2256 = framer_get_drvdata(framer);
config->iface = FRAMER_IFACE_E1;
config->clock_type = pef2256->is_subordinate ? FRAMER_CLOCK_EXT : FRAMER_CLOCK_INT;
config->line_clock_rate = 2048000;
return 0;
}
static const struct framer_ops pef2256_framer_ops = {
.owner = THIS_MODULE,
.get_status = pef2256_framer_get_status,
.get_config = pef2256_framer_get_config,
.set_config = pef2256_framer_set_config,
};
static int pef2256_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
unsigned long sclkr_rate, sclkx_rate;
struct framer_provider *framer_provider;
struct pef2256 *pef2256;
const char *version_txt;
void __iomem *iomem;
int ret;
int irq;
pef2256 = devm_kzalloc(&pdev->dev, sizeof(*pef2256), GFP_KERNEL);
if (!pef2256)
return -ENOMEM;
pef2256->dev = &pdev->dev;
atomic_set(&pef2256->carrier, 0);
pef2256->is_subordinate = true;
pef2256->frame_type = PEF2256_FRAME_E1_DOUBLEFRAME;
iomem = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(iomem))
return PTR_ERR(iomem);
pef2256->regmap = devm_regmap_init_mmio(&pdev->dev, iomem,
&pef2256_regmap_config);
if (IS_ERR(pef2256->regmap)) {
dev_err(&pdev->dev, "Failed to initialise Regmap (%ld)\n",
PTR_ERR(pef2256->regmap));
return PTR_ERR(pef2256->regmap);
}
pef2256->mclk = devm_clk_get_enabled(&pdev->dev, "mclk");
if (IS_ERR(pef2256->mclk))
return PTR_ERR(pef2256->mclk);
pef2256->sclkr = devm_clk_get_enabled(&pdev->dev, "sclkr");
if (IS_ERR(pef2256->sclkr))
return PTR_ERR(pef2256->sclkr);
pef2256->sclkx = devm_clk_get_enabled(&pdev->dev, "sclkx");
if (IS_ERR(pef2256->sclkx))
return PTR_ERR(pef2256->sclkx);
/* Both SCLKR (receive) and SCLKX (transmit) must have the same rate,
* stored as sysclk_rate.
* The exact value will be checked at pef2256_check_rates()
*/
sclkr_rate = clk_get_rate(pef2256->sclkr);
sclkx_rate = clk_get_rate(pef2256->sclkx);
if (sclkr_rate != sclkx_rate) {
dev_err(pef2256->dev, "clk rate mismatch. sclkr %lu Hz, sclkx %lu Hz\n",
sclkr_rate, sclkx_rate);
return -EINVAL;
}
pef2256->sysclk_rate = sclkr_rate;
/* Reset the component. The MCLK clock must be active during reset */
pef2256->reset_gpio = devm_gpiod_get_optional(&pdev->dev, "reset", GPIOD_OUT_LOW);
if (IS_ERR(pef2256->reset_gpio))
return PTR_ERR(pef2256->reset_gpio);
if (pef2256->reset_gpio) {
gpiod_set_value_cansleep(pef2256->reset_gpio, 1);
usleep_range(10, 20);
gpiod_set_value_cansleep(pef2256->reset_gpio, 0);
usleep_range(10, 20);
}
pef2256->version = pef2256_get_version(pef2256);
switch (pef2256->version) {
case PEF2256_VERSION_1_2:
version_txt = "1.2";
break;
case PEF2256_VERSION_2_1:
version_txt = "2.1";
break;
case PEF2256_VERSION_2_2:
version_txt = "2.2";
break;
default:
return -ENODEV;
}
dev_info(pef2256->dev, "Version %s detected\n", version_txt);
ret = pef2556_of_parse(pef2256, np);
if (ret)
return ret;
/* Create the framer. It can be used on interrupts */
pef2256->framer = devm_framer_create(pef2256->dev, NULL, &pef2256_framer_ops);
if (IS_ERR(pef2256->framer))
return PTR_ERR(pef2256->framer);
framer_set_drvdata(pef2256->framer, pef2256);
/* Disable interrupts */
pef2256_write8(pef2256, PEF2256_IMR0, 0xff);
pef2256_write8(pef2256, PEF2256_IMR1, 0xff);
pef2256_write8(pef2256, PEF2256_IMR2, 0xff);
pef2256_write8(pef2256, PEF2256_IMR3, 0xff);
pef2256_write8(pef2256, PEF2256_IMR4, 0xff);
pef2256_write8(pef2256, PEF2256_IMR5, 0xff);
/* Clear any pending interrupts */
pef2256_read8(pef2256, PEF2256_ISR0);
pef2256_read8(pef2256, PEF2256_ISR1);
pef2256_read8(pef2256, PEF2256_ISR2);
pef2256_read8(pef2256, PEF2256_ISR3);
pef2256_read8(pef2256, PEF2256_ISR4);
pef2256_read8(pef2256, PEF2256_ISR5);
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return irq;
ret = devm_request_irq(pef2256->dev, irq, pef2256_irq_handler, 0, "pef2256", pef2256);
if (ret < 0)
return ret;
platform_set_drvdata(pdev, pef2256);
ret = mfd_add_devices(pef2256->dev, 0, pef2256_devs,
ARRAY_SIZE(pef2256_devs), NULL, 0, NULL);
if (ret) {
dev_err(pef2256->dev, "add devices failed (%d)\n", ret);
return ret;
}
ret = pef2256_setup_e1(pef2256);
if (ret)
return ret;
framer_provider = devm_framer_provider_of_register(pef2256->dev,
framer_provider_simple_of_xlate);
if (IS_ERR(framer_provider))
return PTR_ERR(framer_provider);
/* Add audio devices */
ret = pef2256_add_audio_devices(pef2256);
if (ret < 0) {
dev_err(pef2256->dev, "add audio devices failed (%d)\n", ret);
return ret;
}
return 0;
}
static void pef2256_remove(struct platform_device *pdev)
{
struct pef2256 *pef2256 = platform_get_drvdata(pdev);
/* Disable interrupts */
pef2256_write8(pef2256, PEF2256_IMR0, 0xff);
pef2256_write8(pef2256, PEF2256_IMR1, 0xff);
pef2256_write8(pef2256, PEF2256_IMR2, 0xff);
pef2256_write8(pef2256, PEF2256_IMR3, 0xff);
pef2256_write8(pef2256, PEF2256_IMR4, 0xff);
pef2256_write8(pef2256, PEF2256_IMR5, 0xff);
}
static const struct of_device_id pef2256_id_table[] = {
{ .compatible = "lantiq,pef2256" },
{} /* sentinel */
};
MODULE_DEVICE_TABLE(of, pef2256_id_table);
static struct platform_driver pef2256_driver = {
.driver = {
.name = "lantiq-pef2256",
.of_match_table = pef2256_id_table,
},
.probe = pef2256_probe,
.remove_new = pef2256_remove,
};
module_platform_driver(pef2256_driver);
struct regmap *pef2256_get_regmap(struct pef2256 *pef2256)
{
return pef2256->regmap;
}
EXPORT_SYMBOL_GPL(pef2256_get_regmap);
MODULE_AUTHOR("Herve Codina <herve.codina@bootlin.com>");
MODULE_DESCRIPTION("PEF2256 driver");
MODULE_LICENSE("GPL");
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