// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright ( C ) 2006 - 2010 Freescale Semiconductor , Inc . All rights reserved .
*
* Authors : Shlomi Gridish < gridish @ freescale . com >
* Li Yang < leoli @ freescale . com >
* Based on cpm2_common . c from Dan Malek ( dmalek @ jlc . net )
*
* Description :
* General Purpose functions for the global management of the
* QUICC Engine ( QE ) .
*/
#include <linux/bitmap.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/param.h>
#include <linux/string.h>
#include <linux/spinlock.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/ioport.h>
#include <linux/iopoll.h>
#include <linux/crc32.h>
#include <linux/mod_devicetable.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <soc/fsl/qe/immap_qe.h>
#include <soc/fsl/qe/qe.h>
static void qe_snums_init(void );
static int qe_sdma_init(void );
static DEFINE_SPINLOCK(qe_lock);
DEFINE_SPINLOCK(cmxgcr_lock);
EXPORT_SYMBOL(cmxgcr_lock);
/* We allocate this here because it is used almost exclusively for
* the communication processor devices .
*/
struct qe_immap __iomem *qe_immr;
EXPORT_SYMBOL(qe_immr);
static u8 snums[QE_NUM_OF_SNUM]; /* Dynamically allocated SNUMs */
static DECLARE_BITMAP(snum_state, QE_NUM_OF_SNUM);
static unsigned int qe_num_of_snum;
static phys_addr_t qebase = -1 ;
static struct device_node *qe_get_device_node(void )
{
struct device_node *qe;
/*
* Newer device trees have an " fsl , qe " compatible property for the QE
* node , but we still need to support older device trees .
*/
qe = of_find_compatible_node(NULL, NULL, "fsl,qe" );
if (qe)
return qe;
return of_find_node_by_type(NULL, "qe" );
}
static phys_addr_t get_qe_base(void )
{
struct device_node *qe;
int ret;
struct resource res;
if (qebase != -1 )
return qebase;
qe = qe_get_device_node();
if (!qe)
return qebase;
ret = of_address_to_resource(qe, 0 , &res);
if (!ret)
qebase = res.start;
of_node_put(qe);
return qebase;
}
void qe_reset(void )
{
if (qe_immr == NULL)
qe_immr = ioremap(get_qe_base(), QE_IMMAP_SIZE);
qe_snums_init();
qe_issue_cmd(QE_RESET, QE_CR_SUBBLOCK_INVALID,
QE_CR_PROTOCOL_UNSPECIFIED, 0 );
/* Reclaim the MURAM memory for our use. */
qe_muram_init();
if (qe_sdma_init())
panic("sdma init failed!" );
}
int qe_issue_cmd(u32 cmd, u32 device, u8 mcn_protocol, u32 cmd_input)
{
unsigned long flags;
u8 mcn_shift = 0 , dev_shift = 0 ;
u32 val;
int ret;
spin_lock_irqsave(&qe_lock, flags);
if (cmd == QE_RESET) {
iowrite32be((u32)(cmd | QE_CR_FLG), &qe_immr->cp.cecr);
} else {
if (cmd == QE_ASSIGN_PAGE) {
/* Here device is the SNUM, not sub-block */
dev_shift = QE_CR_SNUM_SHIFT;
} else if (cmd == QE_ASSIGN_RISC) {
/* Here device is the SNUM, and mcnProtocol is
* e_QeCmdRiscAssignment value */
dev_shift = QE_CR_SNUM_SHIFT;
mcn_shift = QE_CR_MCN_RISC_ASSIGN_SHIFT;
} else {
if (device == QE_CR_SUBBLOCK_USB)
mcn_shift = QE_CR_MCN_USB_SHIFT;
else
mcn_shift = QE_CR_MCN_NORMAL_SHIFT;
}
iowrite32be(cmd_input, &qe_immr->cp.cecdr);
iowrite32be((cmd | QE_CR_FLG | ((u32)device << dev_shift) | (u32)mcn_protocol << mcn_shift),
&qe_immr->cp.cecr);
}
/* wait for the QE_CR_FLG to clear */
ret = readx_poll_timeout_atomic(ioread32be, &qe_immr->cp.cecr, val,
(val & QE_CR_FLG) == 0 , 0 , 100 );
/* On timeout, ret is -ETIMEDOUT, otherwise it will be 0. */
spin_unlock_irqrestore(&qe_lock, flags);
return ret == 0 ;
}
EXPORT_SYMBOL(qe_issue_cmd);
/* Set a baud rate generator. This needs lots of work. There are
* 16 BRGs , which can be connected to the QE channels or output
* as clocks . The BRGs are in two different block of internal
* memory mapped space .
* The BRG clock is the QE clock divided by 2 .
* It was set up long ago during the initial boot phase and is
* given to us .
* Baud rate clocks are zero - based in the driver code ( as that maps
* to port numbers ) . Documentation uses 1 - based numbering .
*/
static unsigned int brg_clk = 0 ;
#define CLK_GRAN (1000 )
#define CLK_GRAN_LIMIT (5 )
unsigned int qe_get_brg_clk(void )
{
struct device_node *qe;
u32 brg;
unsigned int mod;
if (brg_clk)
return brg_clk;
qe = qe_get_device_node();
if (!qe)
return brg_clk;
if (!of_property_read_u32(qe, "brg-frequency" , &brg))
brg_clk = brg;
of_node_put(qe);
/* round this if near to a multiple of CLK_GRAN */
mod = brg_clk % CLK_GRAN;
if (mod) {
if (mod < CLK_GRAN_LIMIT)
brg_clk -= mod;
else if (mod > (CLK_GRAN - CLK_GRAN_LIMIT))
brg_clk += CLK_GRAN - mod;
}
return brg_clk;
}
EXPORT_SYMBOL(qe_get_brg_clk);
#define PVR_VER_836x 0 x8083
#define PVR_VER_832x 0 x8084
static bool qe_general4_errata(void )
{
#ifdef CONFIG_PPC32
return pvr_version_is(PVR_VER_836x) || pvr_version_is(PVR_VER_832x);
#endif
return false ;
}
/* Program the BRG to the given sampling rate and multiplier
*
* @ brg : the BRG , QE_BRG1 - QE_BRG16
* @ rate : the desired sampling rate
* @ multiplier : corresponds to the value programmed in GUMR_L [ RDCR ] or
* GUMR_L [ TDCR ] . E . g . , if this BRG is the RX clock , and GUMR_L [ RDCR ] = 01 ,
* then ' multiplier ' should be 8 .
*/
int qe_setbrg(enum qe_clock brg, unsigned int rate, unsigned int multiplier)
{
u32 divisor, tempval;
u32 div16 = 0 ;
if ((brg < QE_BRG1) || (brg > QE_BRG16))
return -EINVAL;
divisor = qe_get_brg_clk() / (rate * multiplier);
if (divisor > QE_BRGC_DIVISOR_MAX + 1 ) {
div16 = QE_BRGC_DIV16;
divisor /= 16 ;
}
/* Errata QE_General4, which affects some MPC832x and MPC836x SOCs, says
that the BRG divisor must be even if you ' re not using divide - by - 16
mode. */
if (qe_general4_errata())
if (!div16 && (divisor & 1 ) && (divisor > 3 ))
divisor++;
tempval = ((divisor - 1 ) << QE_BRGC_DIVISOR_SHIFT) |
QE_BRGC_ENABLE | div16;
iowrite32be(tempval, &qe_immr->brg.brgc[brg - QE_BRG1]);
return 0 ;
}
EXPORT_SYMBOL(qe_setbrg);
/* Convert a string to a QE clock source enum
*
* This function takes a string , typically from a property in the device
* tree , and returns the corresponding " enum qe_clock " value .
*/
enum qe_clock qe_clock_source(const char *source)
{
unsigned int i;
if (strcasecmp(source, "none" ) == 0 )
return QE_CLK_NONE;
if (strcmp(source, "tsync_pin" ) == 0 )
return QE_TSYNC_PIN;
if (strcmp(source, "rsync_pin" ) == 0 )
return QE_RSYNC_PIN;
if (strncasecmp(source, "brg" , 3 ) == 0 ) {
i = simple_strtoul(source + 3 , NULL, 10 );
if ((i >= 1 ) && (i <= 16 ))
return (QE_BRG1 - 1 ) + i;
else
return QE_CLK_DUMMY;
}
if (strncasecmp(source, "clk" , 3 ) == 0 ) {
i = simple_strtoul(source + 3 , NULL, 10 );
if ((i >= 1 ) && (i <= 24 ))
return (QE_CLK1 - 1 ) + i;
else
return QE_CLK_DUMMY;
}
return QE_CLK_DUMMY;
}
EXPORT_SYMBOL(qe_clock_source);
/* Initialize SNUMs (thread serial numbers) according to
* QE Module Control chapter , SNUM table
*/
static void qe_snums_init(void )
{
static const u8 snum_init_76[] = {
0 x04, 0 x05, 0 x0C, 0 x0D, 0 x14, 0 x15, 0 x1C, 0 x1D,
0 x24, 0 x25, 0 x2C, 0 x2D, 0 x34, 0 x35, 0 x88, 0 x89,
0 x98, 0 x99, 0 xA8, 0 xA9, 0 xB8, 0 xB9, 0 xC8, 0 xC9,
0 xD8, 0 xD9, 0 xE8, 0 xE9, 0 x44, 0 x45, 0 x4C, 0 x4D,
0 x54, 0 x55, 0 x5C, 0 x5D, 0 x64, 0 x65, 0 x6C, 0 x6D,
0 x74, 0 x75, 0 x7C, 0 x7D, 0 x84, 0 x85, 0 x8C, 0 x8D,
0 x94, 0 x95, 0 x9C, 0 x9D, 0 xA4, 0 xA5, 0 xAC, 0 xAD,
0 xB4, 0 xB5, 0 xBC, 0 xBD, 0 xC4, 0 xC5, 0 xCC, 0 xCD,
0 xD4, 0 xD5, 0 xDC, 0 xDD, 0 xE4, 0 xE5, 0 xEC, 0 xED,
0 xF4, 0 xF5, 0 xFC, 0 xFD,
};
static const u8 snum_init_46[] = {
0 x04, 0 x05, 0 x0C, 0 x0D, 0 x14, 0 x15, 0 x1C, 0 x1D,
0 x24, 0 x25, 0 x2C, 0 x2D, 0 x34, 0 x35, 0 x88, 0 x89,
0 x98, 0 x99, 0 xA8, 0 xA9, 0 xB8, 0 xB9, 0 xC8, 0 xC9,
0 xD8, 0 xD9, 0 xE8, 0 xE9, 0 x08, 0 x09, 0 x18, 0 x19,
0 x28, 0 x29, 0 x38, 0 x39, 0 x48, 0 x49, 0 x58, 0 x59,
0 x68, 0 x69, 0 x78, 0 x79, 0 x80, 0 x81,
};
struct device_node *qe;
const u8 *snum_init;
int i;
bitmap_zero(snum_state, QE_NUM_OF_SNUM);
qe_num_of_snum = 28 ; /* The default number of snum for threads is 28 */
qe = qe_get_device_node();
if (qe) {
i = of_property_read_variable_u8_array(qe, "fsl,qe-snums" ,
snums, 1 , QE_NUM_OF_SNUM);
if (i > 0 ) {
of_node_put(qe);
qe_num_of_snum = i;
return ;
}
/*
* Fall back to legacy binding of using the value of
* fsl , qe - num - snums to choose one of the static arrays
* above .
*/
of_property_read_u32(qe, "fsl,qe-num-snums" , &qe_num_of_snum);
of_node_put(qe);
}
if (qe_num_of_snum == 76 ) {
snum_init = snum_init_76;
} else if (qe_num_of_snum == 28 || qe_num_of_snum == 46 ) {
snum_init = snum_init_46;
} else {
pr_err("QE: unsupported value of fsl,qe-num-snums: %u\n" , qe_num_of_snum);
return ;
}
memcpy(snums, snum_init, qe_num_of_snum);
}
int qe_get_snum(void )
{
unsigned long flags;
int snum = -EBUSY;
int i;
spin_lock_irqsave(&qe_lock, flags);
i = find_first_zero_bit(snum_state, qe_num_of_snum);
if (i < qe_num_of_snum) {
set_bit(i, snum_state);
snum = snums[i];
}
spin_unlock_irqrestore(&qe_lock, flags);
return snum;
}
EXPORT_SYMBOL(qe_get_snum);
void qe_put_snum(u8 snum)
{
const u8 *p = memchr(snums, snum, qe_num_of_snum);
if (p)
clear_bit(p - snums, snum_state);
}
EXPORT_SYMBOL(qe_put_snum);
static int qe_sdma_init(void )
{
struct sdma __iomem *sdma = &qe_immr->sdma;
static s32 sdma_buf_offset = -ENOMEM;
/* allocate 2 internal temporary buffers (512 bytes size each) for
* the SDMA */
if (sdma_buf_offset < 0 ) {
sdma_buf_offset = qe_muram_alloc(512 * 2 , 4096 );
if (sdma_buf_offset < 0 )
return -ENOMEM;
}
iowrite32be((u32)sdma_buf_offset & QE_SDEBCR_BA_MASK,
&sdma->sdebcr);
iowrite32be((QE_SDMR_GLB_1_MSK | (0 x1 << QE_SDMR_CEN_SHIFT)),
&sdma->sdmr);
return 0 ;
}
/* The maximum number of RISCs we support */
#define MAX_QE_RISC 4
/* Firmware information stored here for qe_get_firmware_info() */
static struct qe_firmware_info qe_firmware_info;
/*
* Set to 1 if QE firmware has been uploaded , and therefore
* qe_firmware_info contains valid data .
*/
static int qe_firmware_uploaded;
/*
* Upload a QE microcode
*
* This function is a worker function for qe_upload_firmware ( ) . It does
* the actual uploading of the microcode .
*/
static void qe_upload_microcode(const void *base,
const struct qe_microcode *ucode)
{
const __be32 *code = base + be32_to_cpu(ucode->code_offset);
unsigned int i;
if (ucode->major || ucode->minor || ucode->revision)
printk(KERN_INFO "qe-firmware: "
"uploading microcode '%s' version %u.%u.%u\n" ,
ucode->id, ucode->major, ucode->minor, ucode->revision);
else
printk(KERN_INFO "qe-firmware: "
"uploading microcode '%s'\n" , ucode->id);
/* Use auto-increment */
iowrite32be(be32_to_cpu(ucode->iram_offset) | QE_IRAM_IADD_AIE | QE_IRAM_IADD_BADDR,
&qe_immr->iram.iadd);
for (i = 0 ; i < be32_to_cpu(ucode->count); i++)
iowrite32be(be32_to_cpu(code[i]), &qe_immr->iram.idata);
/* Set I-RAM Ready Register */
iowrite32be(QE_IRAM_READY, &qe_immr->iram.iready);
}
/*
* Upload a microcode to the I - RAM at a specific address .
*
* See Documentation / arch / powerpc / qe_firmware . rst for information on QE microcode
* uploading .
*
* Currently , only version 1 is supported , so the ' version ' field must be
* set to 1 .
*
* The SOC model and revision are not validated , they are only displayed for
* informational purposes .
*
* ' calc_size ' is the calculated size , in bytes , of the firmware structure and
* all of the microcode structures , minus the CRC .
*
* ' length ' is the size that the structure says it is , including the CRC .
*/
int qe_upload_firmware(const struct qe_firmware *firmware)
{
unsigned int i;
unsigned int j;
u32 crc;
size_t calc_size;
size_t length;
const struct qe_header *hdr;
if (!firmware) {
printk(KERN_ERR "qe-firmware: invalid pointer\n" );
return -EINVAL;
}
hdr = &firmware->header;
length = be32_to_cpu(hdr->length);
/* Check the magic */
if ((hdr->magic[0 ] != 'Q' ) || (hdr->magic[1 ] != 'E' ) ||
(hdr->magic[2 ] != 'F' )) {
printk(KERN_ERR "qe-firmware: not a microcode\n" );
return -EPERM;
}
/* Check the version */
if (hdr->version != 1 ) {
printk(KERN_ERR "qe-firmware: unsupported version\n" );
return -EPERM;
}
/* Validate some of the fields */
if ((firmware->count < 1 ) || (firmware->count > MAX_QE_RISC)) {
printk(KERN_ERR "qe-firmware: invalid data\n" );
return -EINVAL;
}
/* Validate the length and check if there's a CRC */
calc_size = struct_size(firmware, microcode, firmware->count);
for (i = 0 ; i < firmware->count; i++)
/*
* For situations where the second RISC uses the same microcode
* as the first , the ' code_offset ' and ' count ' fields will be
* zero , so it ' s okay to add those .
*/
calc_size += sizeof (__be32) *
be32_to_cpu(firmware->microcode[i].count);
/* Validate the length */
if (length != calc_size + sizeof (__be32)) {
printk(KERN_ERR "qe-firmware: invalid length\n" );
return -EPERM;
}
/* Validate the CRC */
crc = be32_to_cpu(*(__be32 *)((void *)firmware + calc_size));
if (crc != crc32(0 , firmware, calc_size)) {
printk(KERN_ERR "qe-firmware: firmware CRC is invalid\n" );
return -EIO;
}
/*
* If the microcode calls for it , split the I - RAM .
*/
if (!firmware->split)
qe_setbits_be16(&qe_immr->cp.cercr, QE_CP_CERCR_CIR);
if (firmware->soc.model)
printk(KERN_INFO
"qe-firmware: firmware '%s' for %u V%u.%u\n" ,
firmware->id, be16_to_cpu(firmware->soc.model),
firmware->soc.major, firmware->soc.minor);
else
printk(KERN_INFO "qe-firmware: firmware '%s'\n" ,
firmware->id);
/*
* The QE only supports one microcode per RISC , so clear out all the
* saved microcode information and put in the new .
*/
memset(&qe_firmware_info, 0 , sizeof (qe_firmware_info));
strscpy(qe_firmware_info.id, firmware->id, sizeof (qe_firmware_info.id));
qe_firmware_info.extended_modes = be64_to_cpu(firmware->extended_modes);
memcpy(qe_firmware_info.vtraps, firmware->vtraps,
sizeof (firmware->vtraps));
/* Loop through each microcode. */
for (i = 0 ; i < firmware->count; i++) {
const struct qe_microcode *ucode = &firmware->microcode[i];
/* Upload a microcode if it's present */
if (ucode->code_offset)
qe_upload_microcode(firmware, ucode);
/* Program the traps for this processor */
for (j = 0 ; j < 16 ; j++) {
u32 trap = be32_to_cpu(ucode->traps[j]);
if (trap)
iowrite32be(trap,
&qe_immr->rsp[i].tibcr[j]);
}
/* Enable traps */
iowrite32be(be32_to_cpu(ucode->eccr),
&qe_immr->rsp[i].eccr);
}
qe_firmware_uploaded = 1 ;
return 0 ;
}
EXPORT_SYMBOL(qe_upload_firmware);
/*
* Get info on the currently - loaded firmware
*
* This function also checks the device tree to see if the boot loader has
* uploaded a firmware already .
*/
struct qe_firmware_info *qe_get_firmware_info(void )
{
static int initialized;
struct device_node *qe;
struct device_node *fw = NULL;
const char *sprop;
/*
* If we haven ' t checked yet , and a driver hasn ' t uploaded a firmware
* yet , then check the device tree for information .
*/
if (qe_firmware_uploaded)
return &qe_firmware_info;
if (initialized)
return NULL;
initialized = 1 ;
qe = qe_get_device_node();
if (!qe)
return NULL;
/* Find the 'firmware' child node */
fw = of_get_child_by_name(qe, "firmware" );
of_node_put(qe);
/* Did we find the 'firmware' node? */
if (!fw)
return NULL;
qe_firmware_uploaded = 1 ;
/* Copy the data into qe_firmware_info*/
sprop = of_get_property(fw, "id" , NULL);
if (sprop)
strscpy(qe_firmware_info.id, sprop,
sizeof (qe_firmware_info.id));
of_property_read_u64(fw, "extended-modes" ,
&qe_firmware_info.extended_modes);
of_property_read_u32_array(fw, "virtual-traps" , qe_firmware_info.vtraps,
ARRAY_SIZE(qe_firmware_info.vtraps));
of_node_put(fw);
return &qe_firmware_info;
}
EXPORT_SYMBOL(qe_get_firmware_info);
unsigned int qe_get_num_of_risc(void )
{
struct device_node *qe;
unsigned int num_of_risc = 0 ;
qe = qe_get_device_node();
if (!qe)
return num_of_risc;
of_property_read_u32(qe, "fsl,qe-num-riscs" , &num_of_risc);
of_node_put(qe);
return num_of_risc;
}
EXPORT_SYMBOL(qe_get_num_of_risc);
unsigned int qe_get_num_of_snums(void )
{
return qe_num_of_snum;
}
EXPORT_SYMBOL(qe_get_num_of_snums);
static int __init qe_init(void )
{
struct device_node *np;
np = of_find_compatible_node(NULL, NULL, "fsl,qe" );
if (!np)
return -ENODEV;
qe_reset();
of_node_put(np);
return 0 ;
}
subsys_initcall(qe_init);
#if defined (CONFIG_SUSPEND) && defined (CONFIG_PPC_85xx)
static int qe_resume(struct platform_device *ofdev)
{
if (!qe_alive_during_sleep())
qe_reset();
return 0 ;
}
static int qe_probe(struct platform_device *ofdev)
{
return 0 ;
}
static const struct of_device_id qe_ids[] = {
{ .compatible = "fsl,qe" , },
{ },
};
static struct platform_driver qe_driver = {
.driver = {
.name = "fsl-qe" ,
.of_match_table = qe_ids,
},
.probe = qe_probe,
.resume = qe_resume,
};
builtin_platform_driver(qe_driver);
#endif /* defined(CONFIG_SUSPEND) && defined(CONFIG_PPC_85xx) */
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