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FSI fixes and updates: 

- Reported build fixes
  - Add configuration of send/echo delayus
  - Object lifetime fix
  - Re-arrange some definitions in preparation for adding the CF master
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Merge tag 'fsi-updates-2018-07-12' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/linux-fsi into char-misc-next

Ben writes:

FSI fixes and updates:

 - Reported build fixes
 - Add configuration of send/echo delayus
 - Object lifetime fix
 - Re-arrange some definitions in preparation for adding the CF master
This commit is contained in:
Greg Kroah-Hartman 2018-07-12 08:42:09 +02:00
parent c9c159b229 fea9cf321c
commit c82705c54f
9 changed files with 826 additions and 191 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/fsi/Kconfig
View File

@ -34,6 +34,7 @@ config FSI_SCOM
config FSI_SBEFIFO
tristate "SBEFIFO FSI client device driver"
depends on OF_ADDRESS
---help---
This option enables an FSI based SBEFIFO device driver. The SBEFIFO is
a pipe-like FSI device for communicating with the self boot engine

215
drivers/fsi/fsi-core.c
View File

@ -81,6 +81,8 @@ struct fsi_slave {
int id;
int link;
uint32_t size; /* size of slave address space */
u8 t_send_delay;
u8 t_echo_delay;
};
#define to_fsi_master(d) container_of(d, struct fsi_master, dev)
@ -190,7 +192,7 @@ static int fsi_slave_calc_addr(struct fsi_slave *slave, uint32_t *addrp,
static int fsi_slave_report_and_clear_errors(struct fsi_slave *slave)
{
struct fsi_master *master = slave->master;
uint32_t irq, stat;
__be32 irq, stat;
int rc, link;
uint8_t id;
@ -215,7 +217,53 @@ static int fsi_slave_report_and_clear_errors(struct fsi_slave *slave)
&irq, sizeof(irq));
}
static int fsi_slave_set_smode(struct fsi_master *master, int link, int id);
/* Encode slave local bus echo delay */
static inline uint32_t fsi_smode_echodly(int x)
{
return (x & FSI_SMODE_ED_MASK) << FSI_SMODE_ED_SHIFT;
}
/* Encode slave local bus send delay */
static inline uint32_t fsi_smode_senddly(int x)
{
return (x & FSI_SMODE_SD_MASK) << FSI_SMODE_SD_SHIFT;
}
/* Encode slave local bus clock rate ratio */
static inline uint32_t fsi_smode_lbcrr(int x)
{
return (x & FSI_SMODE_LBCRR_MASK) << FSI_SMODE_LBCRR_SHIFT;
}
/* Encode slave ID */
static inline uint32_t fsi_smode_sid(int x)
{
return (x & FSI_SMODE_SID_MASK) << FSI_SMODE_SID_SHIFT;
}
static uint32_t fsi_slave_smode(int id, u8 t_senddly, u8 t_echodly)
{
return FSI_SMODE_WSC | FSI_SMODE_ECRC
| fsi_smode_sid(id)
| fsi_smode_echodly(t_echodly - 1) | fsi_smode_senddly(t_senddly - 1)
| fsi_smode_lbcrr(0x8);
}
static int fsi_slave_set_smode(struct fsi_slave *slave)
{
uint32_t smode;
__be32 data;
/* set our smode register with the slave ID field to 0; this enables
* extended slave addressing
*/
smode = fsi_slave_smode(slave->id, slave->t_send_delay, slave->t_echo_delay);
data = cpu_to_be32(smode);
return fsi_master_write(slave->master, slave->link, slave->id,
FSI_SLAVE_BASE + FSI_SMODE,
&data, sizeof(data));
}
static int fsi_slave_handle_error(struct fsi_slave *slave, bool write,
uint32_t addr, size_t size)
@ -223,7 +271,7 @@ static int fsi_slave_handle_error(struct fsi_slave *slave, bool write,
struct fsi_master *master = slave->master;
int rc, link;
uint32_t reg;
uint8_t id;
uint8_t id, send_delay, echo_delay;
if (discard_errors)
return -1;
@ -254,15 +302,26 @@ static int fsi_slave_handle_error(struct fsi_slave *slave, bool write,
}
}
send_delay = slave->t_send_delay;
echo_delay = slave->t_echo_delay;
/* getting serious, reset the slave via BREAK */
rc = fsi_master_break(master, link);
if (rc)
return rc;
rc = fsi_slave_set_smode(master, link, id);
slave->t_send_delay = send_delay;
slave->t_echo_delay = echo_delay;
rc = fsi_slave_set_smode(slave);
if (rc)
return rc;
if (master->link_config)
master->link_config(master, link,
slave->t_send_delay,
slave->t_echo_delay);
return fsi_slave_report_and_clear_errors(slave);
}
@ -390,7 +449,6 @@ static struct device_node *fsi_device_find_of_node(struct fsi_device *dev)
static int fsi_slave_scan(struct fsi_slave *slave)
{
uint32_t engine_addr;
uint32_t conf;
int rc, i;
/*
@ -404,15 +462,17 @@ static int fsi_slave_scan(struct fsi_slave *slave)
for (i = 2; i < engine_page_size / sizeof(uint32_t); i++) {
uint8_t slots, version, type, crc;
struct fsi_device *dev;
uint32_t conf;
__be32 data;
rc = fsi_slave_read(slave, (i + 1) * sizeof(conf),
&conf, sizeof(conf));
rc = fsi_slave_read(slave, (i + 1) * sizeof(data),
&data, sizeof(data));
if (rc) {
dev_warn(&slave->dev,
"error reading slave registers\n");
return -1;
}
conf = be32_to_cpu(conf);
conf = be32_to_cpu(data);
crc = crc4(0, conf, 32);
if (crc) {
@ -562,52 +622,6 @@ static const struct bin_attribute fsi_slave_term_attr = {
.write = fsi_slave_sysfs_term_write,
};
/* Encode slave local bus echo delay */
static inline uint32_t fsi_smode_echodly(int x)
{
return (x & FSI_SMODE_ED_MASK) << FSI_SMODE_ED_SHIFT;
}
/* Encode slave local bus send delay */
static inline uint32_t fsi_smode_senddly(int x)
{
return (x & FSI_SMODE_SD_MASK) << FSI_SMODE_SD_SHIFT;
}
/* Encode slave local bus clock rate ratio */
static inline uint32_t fsi_smode_lbcrr(int x)
{
return (x & FSI_SMODE_LBCRR_MASK) << FSI_SMODE_LBCRR_SHIFT;
}
/* Encode slave ID */
static inline uint32_t fsi_smode_sid(int x)
{
return (x & FSI_SMODE_SID_MASK) << FSI_SMODE_SID_SHIFT;
}
static uint32_t fsi_slave_smode(int id)
{
return FSI_SMODE_WSC | FSI_SMODE_ECRC
| fsi_smode_sid(id)
| fsi_smode_echodly(0xf) | fsi_smode_senddly(0xf)
| fsi_smode_lbcrr(0x8);
}
static int fsi_slave_set_smode(struct fsi_master *master, int link, int id)
{
uint32_t smode;
/* set our smode register with the slave ID field to 0; this enables
* extended slave addressing
*/
smode = fsi_slave_smode(id);
smode = cpu_to_be32(smode);
return fsi_master_write(master, link, id, FSI_SLAVE_BASE + FSI_SMODE,
&smode, sizeof(smode));
}
static void fsi_slave_release(struct device *dev)
{
struct fsi_slave *slave = to_fsi_slave(dev);
@ -659,11 +673,56 @@ static struct device_node *fsi_slave_find_of_node(struct fsi_master *master,
return NULL;
}
static ssize_t slave_send_echo_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct fsi_slave *slave = to_fsi_slave(dev);
return sprintf(buf, "%u\n", slave->t_send_delay);
}
static ssize_t slave_send_echo_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
struct fsi_slave *slave = to_fsi_slave(dev);
struct fsi_master *master = slave->master;
unsigned long val;
int rc;
if (kstrtoul(buf, 0, &val) < 0)
return -EINVAL;
if (val < 1 || val > 16)
return -EINVAL;
if (!master->link_config)
return -ENXIO;
/* Current HW mandates that send and echo delay are identical */
slave->t_send_delay = val;
slave->t_echo_delay = val;
rc = fsi_slave_set_smode(slave);
if (rc < 0)
return rc;
if (master->link_config)
master->link_config(master, slave->link,
slave->t_send_delay,
slave->t_echo_delay);
return count;
}
static DEVICE_ATTR(send_echo_delays, 0600,
slave_send_echo_show, slave_send_echo_store);
static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id)
{
uint32_t chip_id, llmode;
uint32_t chip_id;
struct fsi_slave *slave;
uint8_t crc;
__be32 data, llmode;
int rc;
/* Currently, we only support single slaves on a link, and use the
@ -672,13 +731,13 @@ static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id)
if (id != 0)
return -EINVAL;
rc = fsi_master_read(master, link, id, 0, &chip_id, sizeof(chip_id));
rc = fsi_master_read(master, link, id, 0, &data, sizeof(data));
if (rc) {
dev_dbg(&master->dev, "can't read slave %02x:%02x %d\n",
link, id, rc);
return -ENODEV;
}
chip_id = be32_to_cpu(chip_id);
chip_id = be32_to_cpu(data);
crc = crc4(0, chip_id, 32);
if (crc) {
@ -690,14 +749,6 @@ static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id)
dev_dbg(&master->dev, "fsi: found chip %08x at %02x:%02x:%02x\n",
chip_id, master->idx, link, id);
rc = fsi_slave_set_smode(master, link, id);
if (rc) {
dev_warn(&master->dev,
"can't set smode on slave:%02x:%02x %d\n",
link, id, rc);
return -ENODEV;
}
/* If we're behind a master that doesn't provide a self-running bus
* clock, put the slave into async mode
*/
@ -726,6 +777,21 @@ static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id)
slave->link = link;
slave->id = id;
slave->size = FSI_SLAVE_SIZE_23b;
slave->t_send_delay = 16;
slave->t_echo_delay = 16;
rc = fsi_slave_set_smode(slave);
if (rc) {
dev_warn(&master->dev,
"can't set smode on slave:%02x:%02x %d\n",
link, id, rc);
kfree(slave);
return -ENODEV;
}
if (master->link_config)
master->link_config(master, link,
slave->t_send_delay,
slave->t_echo_delay);
dev_set_name(&slave->dev, "slave@%02x:%02x", link, id);
rc = device_register(&slave->dev);
@ -744,6 +810,10 @@ static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id)
if (rc)
dev_warn(&slave->dev, "failed to create term attr: %d\n", rc);
rc = device_create_file(&slave->dev, &dev_attr_send_echo_delays);
if (rc)
dev_warn(&slave->dev, "failed to create delay attr: %d\n", rc);
rc = fsi_slave_scan(slave);
if (rc)
dev_dbg(&master->dev, "failed during slave scan with: %d\n",
@ -814,12 +884,16 @@ static int fsi_master_link_enable(struct fsi_master *master, int link)
*/
static int fsi_master_break(struct fsi_master *master, int link)
{
int rc = 0;
trace_fsi_master_break(master, link);
if (master->send_break)
return master->send_break(master, link);
rc = master->send_break(master, link);
if (master->link_config)
master->link_config(master, link, 16, 16);
return 0;
return rc;
}
static int fsi_master_scan(struct fsi_master *master)
@ -903,9 +977,6 @@ int fsi_master_register(struct fsi_master *master)
int rc;
struct device_node *np;
if (!master)
return -EINVAL;
master->idx = ida_simple_get(&master_ida, 0, INT_MAX, GFP_KERNEL);
dev_set_name(&master->dev, "fsi%d", master->idx);
@ -917,14 +988,14 @@ int fsi_master_register(struct fsi_master *master)
rc = device_create_file(&master->dev, &dev_attr_rescan);
if (rc) {
device_unregister(&master->dev);
device_del(&master->dev);
ida_simple_remove(&master_ida, master->idx);
return rc;
}
rc = device_create_file(&master->dev, &dev_attr_break);
if (rc) {
device_unregister(&master->dev);
device_del(&master->dev);
ida_simple_remove(&master_ida, master->idx);
return rc;
}

170
drivers/fsi/fsi-master-gpio.c
View File

@ -17,39 +17,6 @@
#include "fsi-master.h"
#define FSI_GPIO_STD_DLY 1 /* Standard pin delay in nS */
#define FSI_ECHO_DELAY_CLOCKS 16 /* Number clocks for echo delay */
#define FSI_PRE_BREAK_CLOCKS 50 /* Number clocks to prep for break */
#define FSI_BREAK_CLOCKS 256 /* Number of clocks to issue break */
#define FSI_POST_BREAK_CLOCKS 16000 /* Number clocks to set up cfam */
#define FSI_INIT_CLOCKS 5000 /* Clock out any old data */
#define FSI_GPIO_DPOLL_CLOCKS 50 /* < 21 will cause slave to hang */
#define FSI_GPIO_EPOLL_CLOCKS 50 /* Number of clocks for E_POLL retry */
#define FSI_GPIO_STD_DELAY 10 /* Standard GPIO delay in nS */
/* todo: adjust down as low as */
/* possible or eliminate */
#define FSI_CRC_ERR_RETRIES 10
#define FSI_GPIO_CMD_DPOLL 0x2
#define FSI_GPIO_CMD_EPOLL 0x3
#define FSI_GPIO_CMD_TERM 0x3f
#define FSI_GPIO_CMD_ABS_AR 0x4
#define FSI_GPIO_CMD_REL_AR 0x5
#define FSI_GPIO_CMD_SAME_AR 0x3 /* but only a 2-bit opcode... */
/* Slave responses */
#define FSI_GPIO_RESP_ACK 0 /* Success */
#define FSI_GPIO_RESP_BUSY 1 /* Slave busy */
#define FSI_GPIO_RESP_ERRA 2 /* Any (misc) Error */
#define FSI_GPIO_RESP_ERRC 3 /* Slave reports master CRC error */
#define FSI_GPIO_MAX_BUSY 200
#define FSI_GPIO_MTOE_COUNT 1000
#define FSI_GPIO_DRAIN_BITS 20
#define FSI_GPIO_CRC_SIZE 4
#define FSI_GPIO_MSG_ID_SIZE 2
#define FSI_GPIO_MSG_RESPID_SIZE 2
#define FSI_GPIO_PRIME_SLAVE_CLOCKS 20
#define LAST_ADDR_INVALID 0x1
struct fsi_master_gpio {
@ -64,6 +31,8 @@ struct fsi_master_gpio {
bool external_mode;
bool no_delays;
uint32_t last_addr;
uint8_t t_send_delay;
uint8_t t_echo_delay;
};
#define CREATE_TRACE_POINTS
@ -128,10 +97,17 @@ static void set_sda_output(struct fsi_master_gpio *master, int value)
static void clock_zeros(struct fsi_master_gpio *master, int count)
{
trace_fsi_master_gpio_clock_zeros(master, count);
set_sda_output(master, 1);
clock_toggle(master, count);
}
static void echo_delay(struct fsi_master_gpio *master)
{
clock_zeros(master, master->t_echo_delay);
}
static void serial_in(struct fsi_master_gpio *master, struct fsi_gpio_msg *msg,
uint8_t num_bits)
{
@ -276,17 +252,20 @@ static void build_ar_command(struct fsi_master_gpio *master,
/* we still address the byte offset within the word */
addr_bits = 2;
opcode_bits = 2;
opcode = FSI_GPIO_CMD_SAME_AR;
opcode = FSI_CMD_SAME_AR;
trace_fsi_master_gpio_cmd_same_addr(master);
} else if (check_relative_address(master, id, addr, &rel_addr)) {
/* 8 bits plus sign */
addr_bits = 9;
addr = rel_addr;
opcode = FSI_GPIO_CMD_REL_AR;
opcode = FSI_CMD_REL_AR;
trace_fsi_master_gpio_cmd_rel_addr(master, rel_addr);
} else {
addr_bits = 21;
opcode = FSI_GPIO_CMD_ABS_AR;
opcode = FSI_CMD_ABS_AR;
trace_fsi_master_gpio_cmd_abs_addr(master, addr);
}
/*
@ -321,7 +300,7 @@ static void build_dpoll_command(struct fsi_gpio_msg *cmd, uint8_t slave_id)
cmd->msg = 0;
msg_push_bits(cmd, slave_id, 2);
msg_push_bits(cmd, FSI_GPIO_CMD_DPOLL, 3);
msg_push_bits(cmd, FSI_CMD_DPOLL, 3);
msg_push_crc(cmd);
}
@ -331,23 +310,17 @@ static void build_epoll_command(struct fsi_gpio_msg *cmd, uint8_t slave_id)
cmd->msg = 0;
msg_push_bits(cmd, slave_id, 2);
msg_push_bits(cmd, FSI_GPIO_CMD_EPOLL, 3);
msg_push_bits(cmd, FSI_CMD_EPOLL, 3);
msg_push_crc(cmd);
}
static void echo_delay(struct fsi_master_gpio *master)
{
set_sda_output(master, 1);
clock_toggle(master, FSI_ECHO_DELAY_CLOCKS);
}
static void build_term_command(struct fsi_gpio_msg *cmd, uint8_t slave_id)
{
cmd->bits = 0;
cmd->msg = 0;
msg_push_bits(cmd, slave_id, 2);
msg_push_bits(cmd, FSI_GPIO_CMD_TERM, 6);
msg_push_bits(cmd, FSI_CMD_TERM, 6);
msg_push_crc(cmd);
}
@ -369,14 +342,14 @@ static int read_one_response(struct fsi_master_gpio *master,
local_irq_save(flags);
/* wait for the start bit */
for (i = 0; i < FSI_GPIO_MTOE_COUNT; i++) {
for (i = 0; i < FSI_MASTER_MTOE_COUNT; i++) {
msg.bits = 0;
msg.msg = 0;
serial_in(master, &msg, 1);
if (msg.msg)
break;
}
if (i == FSI_GPIO_MTOE_COUNT) {
if (i == FSI_MASTER_MTOE_COUNT) {
dev_dbg(master->dev,
"Master time out waiting for response\n");
local_irq_restore(flags);
@ -392,11 +365,11 @@ static int read_one_response(struct fsi_master_gpio *master,
tag = msg.msg & 0x3;
/* If we have an ACK and we're expecting data, clock the data in too */
if (tag == FSI_GPIO_RESP_ACK && data_size)
if (tag == FSI_RESP_ACK && data_size)
serial_in(master, &msg, data_size * 8);
/* read CRC */
serial_in(master, &msg, FSI_GPIO_CRC_SIZE);
serial_in(master, &msg, FSI_CRC_SIZE);
local_irq_restore(flags);
@ -439,7 +412,7 @@ static int issue_term(struct fsi_master_gpio *master, uint8_t slave)
dev_err(master->dev,
"TERM failed; lost communication with slave\n");
return -EIO;
} else if (tag != FSI_GPIO_RESP_ACK) {
} else if (tag != FSI_RESP_ACK) {
dev_err(master->dev, "TERM failed; response %d\n", tag);
return -EIO;
}
@ -475,7 +448,7 @@ static int poll_for_response(struct fsi_master_gpio *master,
trace_fsi_master_gpio_crc_rsp_error(master);
build_epoll_command(&cmd, slave);
local_irq_save(flags);
clock_zeros(master, FSI_GPIO_EPOLL_CLOCKS);
clock_zeros(master, FSI_MASTER_EPOLL_CLOCKS);
serial_out(master, &cmd);
echo_delay(master);
local_irq_restore(flags);
@ -484,7 +457,7 @@ static int poll_for_response(struct fsi_master_gpio *master,
goto fail;
switch (tag) {
case FSI_GPIO_RESP_ACK:
case FSI_RESP_ACK:
if (size && data) {
uint64_t val = response.msg;
/* clear crc & mask */
@ -497,16 +470,16 @@ static int poll_for_response(struct fsi_master_gpio *master,
}
}
break;
case FSI_GPIO_RESP_BUSY:
case FSI_RESP_BUSY:
/*
* Its necessary to clock slave before issuing
* d-poll, not indicated in the hardware protocol
* spec. < 20 clocks causes slave to hang, 21 ok.
*/
if (busy_count++ < FSI_GPIO_MAX_BUSY) {
if (busy_count++ < FSI_MASTER_MAX_BUSY) {
build_dpoll_command(&cmd, slave);
local_irq_save(flags);
clock_zeros(master, FSI_GPIO_DPOLL_CLOCKS);
clock_zeros(master, FSI_MASTER_DPOLL_CLOCKS);
serial_out(master, &cmd);
echo_delay(master);
local_irq_restore(flags);
@ -515,17 +488,17 @@ static int poll_for_response(struct fsi_master_gpio *master,
dev_warn(master->dev,
"ERR slave is stuck in busy state, issuing TERM\n");
local_irq_save(flags);
clock_zeros(master, FSI_GPIO_DPOLL_CLOCKS);
clock_zeros(master, FSI_MASTER_DPOLL_CLOCKS);
local_irq_restore(flags);
issue_term(master, slave);
rc = -EIO;
break;
case FSI_GPIO_RESP_ERRA:
case FSI_RESP_ERRA:
dev_dbg(master->dev, "ERRA received: 0x%x\n", (int)response.msg);
rc = -EIO;
break;
case FSI_GPIO_RESP_ERRC:
case FSI_RESP_ERRC:
dev_dbg(master->dev, "ERRC received: 0x%x\n", (int)response.msg);
trace_fsi_master_gpio_crc_cmd_error(master);
rc = -EAGAIN;
@ -535,9 +508,12 @@ static int poll_for_response(struct fsi_master_gpio *master,
if (busy_count > 0)
trace_fsi_master_gpio_poll_response_busy(master, busy_count);
fail:
/* Clock the slave enough to be ready for next operation */
/*
* tSendDelay clocks, avoids signal reflections when switching
* from receive of response back to send of data.
*/
local_irq_save(flags);
clock_zeros(master, FSI_GPIO_PRIME_SLAVE_CLOCKS);
clock_zeros(master, master->t_send_delay);
local_irq_restore(flags);
return rc;
@ -719,6 +695,22 @@ static int fsi_master_gpio_link_enable(struct fsi_master *_master, int link)
return rc;
}
static int fsi_master_gpio_link_config(struct fsi_master *_master, int link,
u8 t_send_delay, u8 t_echo_delay)
{
struct fsi_master_gpio *master = to_fsi_master_gpio(_master);
if (link != 0)
return -ENODEV;
mutex_lock(&master->cmd_lock);
master->t_send_delay = t_send_delay;
master->t_echo_delay = t_echo_delay;
mutex_unlock(&master->cmd_lock);
return 0;
}
static ssize_t external_mode_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
@ -765,32 +757,44 @@ static ssize_t external_mode_store(struct device *dev,
static DEVICE_ATTR(external_mode, 0664,
external_mode_show, external_mode_store);
static void fsi_master_gpio_release(struct device *dev)
{
struct fsi_master_gpio *master = to_fsi_master_gpio(dev_to_fsi_master(dev));
of_node_put(dev_of_node(master->dev));
kfree(master);
}
static int fsi_master_gpio_probe(struct platform_device *pdev)
{
struct fsi_master_gpio *master;
struct gpio_desc *gpio;
int rc;
master = devm_kzalloc(&pdev->dev, sizeof(*master), GFP_KERNEL);
master = kzalloc(sizeof(*master), GFP_KERNEL);
if (!master)
return -ENOMEM;
master->dev = &pdev->dev;
master->master.dev.parent = master->dev;
master->master.dev.of_node = of_node_get(dev_of_node(master->dev));
master->master.dev.release = fsi_master_gpio_release;
master->last_addr = LAST_ADDR_INVALID;
gpio = devm_gpiod_get(&pdev->dev, "clock", 0);
if (IS_ERR(gpio)) {
dev_err(&pdev->dev, "failed to get clock gpio\n");
return PTR_ERR(gpio);
rc = PTR_ERR(gpio);
goto err_free;
}
master->gpio_clk = gpio;
gpio = devm_gpiod_get(&pdev->dev, "data", 0);
if (IS_ERR(gpio)) {
dev_err(&pdev->dev, "failed to get data gpio\n");
return PTR_ERR(gpio);
rc = PTR_ERR(gpio);
goto err_free;
}
master->gpio_data = gpio;
@ -798,21 +802,24 @@ static int fsi_master_gpio_probe(struct platform_device *pdev)
gpio = devm_gpiod_get_optional(&pdev->dev, "trans", 0);
if (IS_ERR(gpio)) {
dev_err(&pdev->dev, "failed to get trans gpio\n");
return PTR_ERR(gpio);
rc = PTR_ERR(gpio);
goto err_free;
}
master->gpio_trans = gpio;
gpio = devm_gpiod_get_optional(&pdev->dev, "enable", 0);
if (IS_ERR(gpio)) {
dev_err(&pdev->dev, "failed to get enable gpio\n");
return PTR_ERR(gpio);
rc = PTR_ERR(gpio);
goto err_free;
}
master->gpio_enable = gpio;
gpio = devm_gpiod_get_optional(&pdev->dev, "mux", 0);
if (IS_ERR(gpio)) {
dev_err(&pdev->dev, "failed to get mux gpio\n");
return PTR_ERR(gpio);
rc = PTR_ERR(gpio);
goto err_free;
}
master->gpio_mux = gpio;
@ -823,6 +830,10 @@ static int fsi_master_gpio_probe(struct platform_device *pdev)
*/
master->no_delays = device_property_present(&pdev->dev, "no-gpio-delays");
/* Default FSI command delays */
master->t_send_delay = FSI_SEND_DELAY_CLOCKS;
master->t_echo_delay = FSI_ECHO_DELAY_CLOCKS;
master->master.n_links = 1;
master->master.flags = FSI_MASTER_FLAG_SWCLOCK;
master->master.read = fsi_master_gpio_read;
@ -830,6 +841,7 @@ static int fsi_master_gpio_probe(struct platform_device *pdev)
master->master.term = fsi_master_gpio_term;
master->master.send_break = fsi_master_gpio_break;
master->master.link_enable = fsi_master_gpio_link_enable;
master->master.link_config = fsi_master_gpio_link_config;
platform_set_drvdata(pdev, master);
mutex_init(&master->cmd_lock);
@ -837,27 +849,29 @@ static int fsi_master_gpio_probe(struct platform_device *pdev)
rc = device_create_file(&pdev->dev, &dev_attr_external_mode);
if (rc)
return rc;
goto err_free;
return fsi_master_register(&master->master);
rc = fsi_master_register(&master->master);
if (rc) {
device_remove_file(&pdev->dev, &dev_attr_external_mode);
put_device(&master->master.dev);
return rc;
}
return 0;
err_free:
kfree(master);
return rc;
}
static int fsi_master_gpio_remove(struct platform_device *pdev)
{
struct fsi_master_gpio *master = platform_get_drvdata(pdev);
devm_gpiod_put(&pdev->dev, master->gpio_clk);
devm_gpiod_put(&pdev->dev, master->gpio_data);
if (master->gpio_trans)
devm_gpiod_put(&pdev->dev, master->gpio_trans);
if (master->gpio_enable)
devm_gpiod_put(&pdev->dev, master->gpio_enable);
if (master->gpio_mux)
devm_gpiod_put(&pdev->dev, master->gpio_mux);
fsi_master_unregister(&master->master);
device_remove_file(&pdev->dev, &dev_attr_external_mode);
of_node_put(master->master.dev.of_node);
fsi_master_unregister(&master->master);
return 0;
}

5
drivers/fsi/fsi-master-hub.c
View File

@ -122,7 +122,8 @@ static int hub_master_write(struct fsi_master *master, int link,
static int hub_master_break(struct fsi_master *master, int link)
{
uint32_t addr, cmd;
uint32_t addr;
__be32 cmd;
addr = 0x4;
cmd = cpu_to_be32(0xc0de0000);
@ -205,7 +206,7 @@ static int hub_master_init(struct fsi_master_hub *hub)
if (rc)
return rc;
reg = ~0;
reg = cpu_to_be32(~0);
rc = fsi_device_write(dev, FSI_MSENP0, &reg, sizeof(reg));
if (rc)
return rc;

35
drivers/fsi/fsi-master.h
View File

@ -19,6 +19,39 @@
#include <linux/device.h>
/* Various protocol delays */
#define FSI_ECHO_DELAY_CLOCKS 16 /* Number clocks for echo delay */
#define FSI_SEND_DELAY_CLOCKS 16 /* Number clocks for send delay */
#define FSI_PRE_BREAK_CLOCKS 50 /* Number clocks to prep for break */
#define FSI_BREAK_CLOCKS 256 /* Number of clocks to issue break */
#define FSI_POST_BREAK_CLOCKS 16000 /* Number clocks to set up cfam */
#define FSI_INIT_CLOCKS 5000 /* Clock out any old data */
#define FSI_MASTER_DPOLL_CLOCKS 50 /* < 21 will cause slave to hang */
#define FSI_MASTER_EPOLL_CLOCKS 50 /* Number of clocks for E_POLL retry */
/* Various retry maximums */
#define FSI_CRC_ERR_RETRIES 10
#define FSI_MASTER_MAX_BUSY 200
#define FSI_MASTER_MTOE_COUNT 1000
/* Command encodings */
#define FSI_CMD_DPOLL 0x2
#define FSI_CMD_EPOLL 0x3
#define FSI_CMD_TERM 0x3f
#define FSI_CMD_ABS_AR 0x4
#define FSI_CMD_REL_AR 0x5
#define FSI_CMD_SAME_AR 0x3 /* but only a 2-bit opcode... */
/* Slave responses */
#define FSI_RESP_ACK 0 /* Success */
#define FSI_RESP_BUSY 1 /* Slave busy */
#define FSI_RESP_ERRA 2 /* Any (misc) Error */
#define FSI_RESP_ERRC 3 /* Slave reports master CRC error */
/* Misc */
#define FSI_CRC_SIZE 4
/* fsi-master definition and flags */
#define FSI_MASTER_FLAG_SWCLOCK 0x1
struct fsi_master {
@ -33,6 +66,8 @@ struct fsi_master {
int (*term)(struct fsi_master *, int link, uint8_t id);
int (*send_break)(struct fsi_master *, int link);
int (*link_enable)(struct fsi_master *, int link);
int (*link_config)(struct fsi_master *, int link,
u8 t_send_delay, u8 t_echo_delay);
};
#define dev_to_fsi_master(d) container_of(d, struct fsi_master, dev)

15
drivers/fsi/fsi-sbefifo.c
View File

@ -194,6 +194,7 @@ static void sbefifo_dump_ffdc(struct device *dev, const __be32 *ffdc,
}
dev_warn(dev, "+-------------------------------------------+\n");
}
mutex_unlock(&sbefifo_ffdc_mutex);
}
int sbefifo_parse_status(struct device *dev, u16 cmd, __be32 *response,
@ -519,9 +520,10 @@ static int sbefifo_send_command(struct sbefifo *sbefifo,
static int sbefifo_read_response(struct sbefifo *sbefifo, struct iov_iter *response)
{
struct device *dev = &sbefifo->fsi_dev->dev;
u32 data, status, eot_set;
u32 status, eot_set;
unsigned long timeout;
bool overflow = false;
__be32 data;
size_t len;
int rc;
@ -619,7 +621,7 @@ static void sbefifo_collect_async_ffdc(struct sbefifo *sbefifo)
struct kvec ffdc_iov;
__be32 *ffdc;
size_t ffdc_sz;
u32 cmd[2];
__be32 cmd[2];
int rc;
sbefifo->async_ffdc = false;
@ -629,7 +631,7 @@ static void sbefifo_collect_async_ffdc(struct sbefifo *sbefifo)
return;
}
ffdc_iov.iov_base = ffdc;
ffdc_iov.iov_len = SBEFIFO_MAX_FFDC_SIZE;;
ffdc_iov.iov_len = SBEFIFO_MAX_FFDC_SIZE;
iov_iter_kvec(&ffdc_iter, WRITE | ITER_KVEC, &ffdc_iov, 1, SBEFIFO_MAX_FFDC_SIZE);
cmd[0] = cpu_to_be32(2);
cmd[1] = cpu_to_be32(SBEFIFO_CMD_GET_SBE_FFDC);
@ -704,13 +706,16 @@ static int __sbefifo_submit(struct sbefifo *sbefifo,
int sbefifo_submit(struct device *dev, const __be32 *command, size_t cmd_len,
__be32 *response, size_t *resp_len)
{
struct sbefifo *sbefifo = dev_get_drvdata(dev);
struct sbefifo *sbefifo;
struct iov_iter resp_iter;
struct kvec resp_iov;
size_t rbytes;
int rc;
if (!dev || !sbefifo)
if (!dev)
return -ENODEV;
sbefifo = dev_get_drvdata(dev);
if (!sbefifo)
return -ENODEV;
if (WARN_ON_ONCE(sbefifo->magic != SBEFIFO_MAGIC))
return -ENODEV;

443
drivers/fsi/fsi-scom.c
View File

@ -24,19 +24,61 @@
#include <linux/list.h>
#include <linux/idr.h>
#include <uapi/linux/fsi.h>
#define FSI_ENGID_SCOM 0x5
/* SCOM engine register set */
#define SCOM_DATA0_REG 0x00
#define SCOM_DATA1_REG 0x04
#define SCOM_CMD_REG 0x08
#define SCOM_FSI2PIB_RESET_REG 0x18
#define SCOM_STATUS_REG 0x1C /* Read */
#define SCOM_PIB_RESET_REG 0x1C /* Write */
/* Command register */
#define SCOM_WRITE_CMD 0x80000000
#define SCOM_READ_CMD 0x00000000
/* Status register bits */
#define SCOM_STATUS_ERR_SUMMARY 0x80000000
#define SCOM_STATUS_PROTECTION 0x01000000
#define SCOM_STATUS_PARITY 0x04000000
#define SCOM_STATUS_PIB_ABORT 0x00100000
#define SCOM_STATUS_PIB_RESP_MASK 0x00007000
#define SCOM_STATUS_PIB_RESP_SHIFT 12
#define SCOM_STATUS_ANY_ERR (SCOM_STATUS_ERR_SUMMARY | \
SCOM_STATUS_PROTECTION | \
SCOM_STATUS_PARITY | \
SCOM_STATUS_PIB_ABORT | \
SCOM_STATUS_PIB_RESP_MASK)
/* SCOM address encodings */
#define XSCOM_ADDR_IND_FLAG BIT_ULL(63)
#define XSCOM_ADDR_INF_FORM1 BIT_ULL(60)
/* SCOM indirect stuff */
#define XSCOM_ADDR_DIRECT_PART 0x7fffffffull
#define XSCOM_ADDR_INDIRECT_PART 0x000fffff00000000ull
#define XSCOM_DATA_IND_READ BIT_ULL(63)
#define XSCOM_DATA_IND_COMPLETE BIT_ULL(31)
#define XSCOM_DATA_IND_ERR_MASK 0x70000000ull
#define XSCOM_DATA_IND_ERR_SHIFT 28
#define XSCOM_DATA_IND_DATA 0x0000ffffull
#define XSCOM_DATA_IND_FORM1_DATA 0x000fffffffffffffull
#define XSCOM_ADDR_FORM1_LOW 0x000ffffffffull
#define XSCOM_ADDR_FORM1_HI 0xfff00000000ull
#define XSCOM_ADDR_FORM1_HI_SHIFT 20
/* Retries */
#define SCOM_MAX_RETRIES 100 /* Retries on busy */
#define SCOM_MAX_IND_RETRIES 10 /* Retries indirect not ready */
struct scom_device {
struct list_head link;
struct fsi_device *fsi_dev;
struct miscdevice mdev;
struct mutex lock;
char name[32];
int idx;
};
@ -47,11 +89,11 @@ static struct list_head scom_devices;
static DEFINE_IDA(scom_ida);
static int put_scom(struct scom_device *scom_dev, uint64_t value,
uint32_t addr)
static int __put_scom(struct scom_device *scom_dev, uint64_t value,
uint32_t addr, uint32_t *status)
{
__be32 data, raw_status;
int rc;
uint32_t data;
data = cpu_to_be32((value >> 32) & 0xffffffff);
rc = fsi_device_write(scom_dev->fsi_dev, SCOM_DATA0_REG, &data,
@ -66,53 +108,285 @@ static int put_scom(struct scom_device *scom_dev, uint64_t value,
return rc;
data = cpu_to_be32(SCOM_WRITE_CMD | addr);
return fsi_device_write(scom_dev->fsi_dev, SCOM_CMD_REG, &data,
sizeof(uint32_t));
}
static int get_scom(struct scom_device *scom_dev, uint64_t *value,
uint32_t addr)
{
uint32_t result, data;
int rc;
*value = 0ULL;
data = cpu_to_be32(addr);
rc = fsi_device_write(scom_dev->fsi_dev, SCOM_CMD_REG, &data,
sizeof(uint32_t));
if (rc)
return rc;
rc = fsi_device_read(scom_dev->fsi_dev, SCOM_DATA0_REG, &result,
rc = fsi_device_read(scom_dev->fsi_dev, SCOM_STATUS_REG, &raw_status,
sizeof(uint32_t));
if (rc)
return rc;
*value |= (uint64_t)cpu_to_be32(result) << 32;
rc = fsi_device_read(scom_dev->fsi_dev, SCOM_DATA1_REG, &result,
sizeof(uint32_t));
if (rc)
return rc;
*value |= cpu_to_be32(result);
*status = be32_to_cpu(raw_status);
return 0;
}
static int __get_scom(struct scom_device *scom_dev, uint64_t *value,
uint32_t addr, uint32_t *status)
{
__be32 data, raw_status;
int rc;
*value = 0ULL;
data = cpu_to_be32(SCOM_READ_CMD | addr);
rc = fsi_device_write(scom_dev->fsi_dev, SCOM_CMD_REG, &data,
sizeof(uint32_t));
if (rc)
return rc;
rc = fsi_device_read(scom_dev->fsi_dev, SCOM_STATUS_REG, &raw_status,
sizeof(uint32_t));
if (rc)
return rc;
/*
* Read the data registers even on error, so we don't have
* to interpret the status register here.
*/
rc = fsi_device_read(scom_dev->fsi_dev, SCOM_DATA0_REG, &data,
sizeof(uint32_t));
if (rc)
return rc;
*value |= (uint64_t)be32_to_cpu(data) << 32;
rc = fsi_device_read(scom_dev->fsi_dev, SCOM_DATA1_REG, &data,
sizeof(uint32_t));
if (rc)
return rc;
*value |= be32_to_cpu(data);
*status = be32_to_cpu(raw_status);
return rc;
}
static int put_indirect_scom_form0(struct scom_device *scom, uint64_t value,
uint64_t addr, uint32_t *status)
{
uint64_t ind_data, ind_addr;
int rc, retries, err = 0;
if (value & ~XSCOM_DATA_IND_DATA)
return -EINVAL;
ind_addr = addr & XSCOM_ADDR_DIRECT_PART;
ind_data = (addr & XSCOM_ADDR_INDIRECT_PART) | value;
rc = __put_scom(scom, ind_data, ind_addr, status);
if (rc || (*status & SCOM_STATUS_ANY_ERR))
return rc;
for (retries = 0; retries < SCOM_MAX_IND_RETRIES; retries++) {
rc = __get_scom(scom, &ind_data, addr, status);
if (rc || (*status & SCOM_STATUS_ANY_ERR))
return rc;
err = (ind_data & XSCOM_DATA_IND_ERR_MASK) >> XSCOM_DATA_IND_ERR_SHIFT;
*status = err << SCOM_STATUS_PIB_RESP_SHIFT;
if ((ind_data & XSCOM_DATA_IND_COMPLETE) || (err != SCOM_PIB_BLOCKED))
return 0;
msleep(1);
}
return rc;
}
static int put_indirect_scom_form1(struct scom_device *scom, uint64_t value,
uint64_t addr, uint32_t *status)
{
uint64_t ind_data, ind_addr;
if (value & ~XSCOM_DATA_IND_FORM1_DATA)
return -EINVAL;
ind_addr = addr & XSCOM_ADDR_FORM1_LOW;
ind_data = value | (addr & XSCOM_ADDR_FORM1_HI) << XSCOM_ADDR_FORM1_HI_SHIFT;
return __put_scom(scom, ind_data, ind_addr, status);
}
static int get_indirect_scom_form0(struct scom_device *scom, uint64_t *value,
uint64_t addr, uint32_t *status)
{
uint64_t ind_data, ind_addr;
int rc, retries, err = 0;
ind_addr = addr & XSCOM_ADDR_DIRECT_PART;
ind_data = (addr & XSCOM_ADDR_INDIRECT_PART) | XSCOM_DATA_IND_READ;
rc = __put_scom(scom, ind_data, ind_addr, status);
if (rc || (*status & SCOM_STATUS_ANY_ERR))
return rc;
for (retries = 0; retries < SCOM_MAX_IND_RETRIES; retries++) {
rc = __get_scom(scom, &ind_data, addr, status);
if (rc || (*status & SCOM_STATUS_ANY_ERR))
return rc;
err = (ind_data & XSCOM_DATA_IND_ERR_MASK) >> XSCOM_DATA_IND_ERR_SHIFT;
*status = err << SCOM_STATUS_PIB_RESP_SHIFT;
*value = ind_data & XSCOM_DATA_IND_DATA;
if ((ind_data & XSCOM_DATA_IND_COMPLETE) || (err != SCOM_PIB_BLOCKED))
return 0;
msleep(1);
}
return rc;
}
static int raw_put_scom(struct scom_device *scom, uint64_t value,
uint64_t addr, uint32_t *status)
{
if (addr & XSCOM_ADDR_IND_FLAG) {
if (addr & XSCOM_ADDR_INF_FORM1)
return put_indirect_scom_form1(scom, value, addr, status);
else
return put_indirect_scom_form0(scom, value, addr, status);
} else
return __put_scom(scom, value, addr, status);
}
static int raw_get_scom(struct scom_device *scom, uint64_t *value,
uint64_t addr, uint32_t *status)
{
if (addr & XSCOM_ADDR_IND_FLAG) {
if (addr & XSCOM_ADDR_INF_FORM1)
return -ENXIO;
return get_indirect_scom_form0(scom, value, addr, status);
} else
return __get_scom(scom, value, addr, status);
}
static int handle_fsi2pib_status(struct scom_device *scom, uint32_t status)
{
uint32_t dummy = -1;
if (status & SCOM_STATUS_PROTECTION)
return -EPERM;
if (status & SCOM_STATUS_PARITY) {
fsi_device_write(scom->fsi_dev, SCOM_FSI2PIB_RESET_REG, &dummy,
sizeof(uint32_t));
return -EIO;
}
/* Return -EBUSY on PIB abort to force a retry */
if (status & SCOM_STATUS_PIB_ABORT)
return -EBUSY;
if (status & SCOM_STATUS_ERR_SUMMARY) {
fsi_device_write(scom->fsi_dev, SCOM_FSI2PIB_RESET_REG, &dummy,
sizeof(uint32_t));
return -EIO;
}
return 0;
}
static int handle_pib_status(struct scom_device *scom, uint8_t status)
{
uint32_t dummy = -1;
if (status == SCOM_PIB_SUCCESS)
return 0;
if (status == SCOM_PIB_BLOCKED)
return -EBUSY;
/* Reset the bridge */
fsi_device_write(scom->fsi_dev, SCOM_FSI2PIB_RESET_REG, &dummy,
sizeof(uint32_t));
switch(status) {
case SCOM_PIB_OFFLINE:
return -ENODEV;
case SCOM_PIB_BAD_ADDR:
return -ENXIO;
case SCOM_PIB_TIMEOUT:
return -ETIMEDOUT;
case SCOM_PIB_PARTIAL:
case SCOM_PIB_CLK_ERR:
case SCOM_PIB_PARITY_ERR:
default:
return -EIO;
}
}
static int put_scom(struct scom_device *scom, uint64_t value,
uint64_t addr)
{
uint32_t status, dummy = -1;
int rc, retries;
for (retries = 0; retries < SCOM_MAX_RETRIES; retries++) {
rc = raw_put_scom(scom, value, addr, &status);
if (rc) {
/* Try resetting the bridge if FSI fails */
if (rc != -ENODEV && retries == 0) {
fsi_device_write(scom->fsi_dev, SCOM_FSI2PIB_RESET_REG,
&dummy, sizeof(uint32_t));
rc = -EBUSY;
} else
return rc;
} else
rc = handle_fsi2pib_status(scom, status);
if (rc && rc != -EBUSY)
break;
if (rc == 0) {
rc = handle_pib_status(scom,
(status & SCOM_STATUS_PIB_RESP_MASK)
>> SCOM_STATUS_PIB_RESP_SHIFT);
if (rc && rc != -EBUSY)
break;
}
if (rc == 0)
break;
msleep(1);
}
return rc;
}
static int get_scom(struct scom_device *scom, uint64_t *value,
uint64_t addr)
{
uint32_t status, dummy = -1;
int rc, retries;
for (retries = 0; retries < SCOM_MAX_RETRIES; retries++) {
rc = raw_get_scom(scom, value, addr, &status);
if (rc) {
/* Try resetting the bridge if FSI fails */
if (rc != -ENODEV && retries == 0) {
fsi_device_write(scom->fsi_dev, SCOM_FSI2PIB_RESET_REG,
&dummy, sizeof(uint32_t));
rc = -EBUSY;
} else
return rc;
} else
rc = handle_fsi2pib_status(scom, status);
if (rc && rc != -EBUSY)
break;
if (rc == 0) {
rc = handle_pib_status(scom,
(status & SCOM_STATUS_PIB_RESP_MASK)
>> SCOM_STATUS_PIB_RESP_SHIFT);
if (rc && rc != -EBUSY)
break;
}
if (rc == 0)
break;
msleep(1);
}
return rc;
}
static ssize_t scom_read(struct file *filep, char __user *buf, size_t len,
loff_t *offset)
{
int rc;
struct miscdevice *mdev =
(struct miscdevice *)filep->private_data;
struct scom_device *scom = to_scom_dev(mdev);
struct device *dev = &scom->fsi_dev->dev;
uint64_t val;
int rc;
if (len != sizeof(uint64_t))
return -EINVAL;
mutex_lock(&scom->lock);
rc = get_scom(scom, &val, *offset);
mutex_unlock(&scom->lock);
if (rc) {
dev_dbg(dev, "get_scom fail:%d\n", rc);
return rc;
@ -143,7 +417,9 @@ static ssize_t scom_write(struct file *filep, const char __user *buf,
return -EINVAL;
}
mutex_lock(&scom->lock);
rc = put_scom(scom, val, *offset);
mutex_unlock(&scom->lock);
if (rc) {
dev_dbg(dev, "put_scom failed with:%d\n", rc);
return rc;
@ -167,11 +443,125 @@ static loff_t scom_llseek(struct file *file, loff_t offset, int whence)
return offset;
}
static void raw_convert_status(struct scom_access *acc, uint32_t status)
{
acc->pib_status = (status & SCOM_STATUS_PIB_RESP_MASK) >>
SCOM_STATUS_PIB_RESP_SHIFT;
acc->intf_errors = 0;
if (status & SCOM_STATUS_PROTECTION)
acc->intf_errors |= SCOM_INTF_ERR_PROTECTION;
else if (status & SCOM_STATUS_PARITY)
acc->intf_errors |= SCOM_INTF_ERR_PARITY;
else if (status & SCOM_STATUS_PIB_ABORT)
acc->intf_errors |= SCOM_INTF_ERR_ABORT;
else if (status & SCOM_STATUS_ERR_SUMMARY)
acc->intf_errors |= SCOM_INTF_ERR_UNKNOWN;
}
static int scom_raw_read(struct scom_device *scom, void __user *argp)
{
struct scom_access acc;
uint32_t status;
int rc;
if (copy_from_user(&acc, argp, sizeof(struct scom_access)))
return -EFAULT;
rc = raw_get_scom(scom, &acc.data, acc.addr, &status);
if (rc)
return rc;
raw_convert_status(&acc, status);
if (copy_to_user(argp, &acc, sizeof(struct scom_access)))
return -EFAULT;
return 0;
}
static int scom_raw_write(struct scom_device *scom, void __user *argp)
{
u64 prev_data, mask, data;
struct scom_access acc;
uint32_t status;
int rc;
if (copy_from_user(&acc, argp, sizeof(struct scom_access)))
return -EFAULT;
if (acc.mask) {
rc = raw_get_scom(scom, &prev_data, acc.addr, &status);
if (rc)
return rc;
if (status & SCOM_STATUS_ANY_ERR)
goto fail;
mask = acc.mask;
} else {
prev_data = mask = -1ull;
}
data = (prev_data & ~mask) | (acc.data & mask);
rc = raw_put_scom(scom, data, acc.addr, &status);
if (rc)
return rc;
fail:
raw_convert_status(&acc, status);
if (copy_to_user(argp, &acc, sizeof(struct scom_access)))
return -EFAULT;
return 0;
}
static int scom_reset(struct scom_device *scom, void __user *argp)
{
uint32_t flags, dummy = -1;
int rc = 0;
if (get_user(flags, (__u32 __user *)argp))
return -EFAULT;
if (flags & SCOM_RESET_PIB)
rc = fsi_device_write(scom->fsi_dev, SCOM_PIB_RESET_REG, &dummy,
sizeof(uint32_t));
if (!rc && (flags & (SCOM_RESET_PIB | SCOM_RESET_INTF)))
rc = fsi_device_write(scom->fsi_dev, SCOM_FSI2PIB_RESET_REG, &dummy,
sizeof(uint32_t));
return rc;
}
static int scom_check(struct scom_device *scom, void __user *argp)
{
/* Still need to find out how to get "protected" */
return put_user(SCOM_CHECK_SUPPORTED, (__u32 __user *)argp);
}
static long scom_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
struct miscdevice *mdev = file->private_data;
struct scom_device *scom = to_scom_dev(mdev);
void __user *argp = (void __user *)arg;
int rc = -ENOTTY;
mutex_lock(&scom->lock);
switch(cmd) {
case FSI_SCOM_CHECK:
rc = scom_check(scom, argp);
break;
case FSI_SCOM_READ:
rc = scom_raw_read(scom, argp);
break;
case FSI_SCOM_WRITE:
rc = scom_raw_write(scom, argp);
break;
case FSI_SCOM_RESET:
rc = scom_reset(scom, argp);
break;
}
mutex_unlock(&scom->lock);
return rc;
}
static const struct file_operations scom_fops = {
.owner = THIS_MODULE,
.llseek = scom_llseek,
.read = scom_read,
.write = scom_write,
.unlocked_ioctl = scom_ioctl,
};
static int scom_probe(struct device *dev)
@ -183,6 +573,7 @@ static int scom_probe(struct device *dev)
if (!scom)
return -ENOMEM;
mutex_init(&scom->lock);
scom->idx = ida_simple_get(&scom_ida, 1, INT_MAX, GFP_KERNEL);
snprintf(scom->name, sizeof(scom->name), "scom%d", scom->idx);
scom->fsi_dev = fsi_dev;

59
include/trace/events/fsi_master_gpio.h
View File

@ -50,6 +50,22 @@ TRACE_EVENT(fsi_master_gpio_out,
)
);
TRACE_EVENT(fsi_master_gpio_clock_zeros,
TP_PROTO(const struct fsi_master_gpio *master, int clocks),
TP_ARGS(master, clocks),
TP_STRUCT__entry(
__field(int, master_idx)
__field(int, clocks)
),
TP_fast_assign(
__entry->master_idx = master->master.idx;
__entry->clocks = clocks;
),
TP_printk("fsi-gpio%d clock %d zeros",
__entry->master_idx, __entry->clocks
)
);
TRACE_EVENT(fsi_master_gpio_break,
TP_PROTO(const struct fsi_master_gpio *master),
TP_ARGS(master),
@ -107,6 +123,49 @@ TRACE_EVENT(fsi_master_gpio_poll_response_busy,
__entry->master_idx, __entry->busy)
);
TRACE_EVENT(fsi_master_gpio_cmd_abs_addr,
TP_PROTO(const struct fsi_master_gpio *master, u32 addr),
TP_ARGS(master, addr),
TP_STRUCT__entry(
__field(int, master_idx)
__field(u32, addr)
),
TP_fast_assign(
__entry->master_idx = master->master.idx;
__entry->addr = addr;
),
TP_printk("fsi-gpio%d: Sending ABS_ADR %06x",
__entry->master_idx, __entry->addr)
);
TRACE_EVENT(fsi_master_gpio_cmd_rel_addr,
TP_PROTO(const struct fsi_master_gpio *master, u32 rel_addr),
TP_ARGS(master, rel_addr),
TP_STRUCT__entry(
__field(int, master_idx)
__field(u32, rel_addr)
),
TP_fast_assign(
__entry->master_idx = master->master.idx;
__entry->rel_addr = rel_addr;
),
TP_printk("fsi-gpio%d: Sending REL_ADR %03x",
__entry->master_idx, __entry->rel_addr)
);
TRACE_EVENT(fsi_master_gpio_cmd_same_addr,
TP_PROTO(const struct fsi_master_gpio *master),
TP_ARGS(master),
TP_STRUCT__entry(
__field(int, master_idx)
),
TP_fast_assign(
__entry->master_idx = master->master.idx;
),
TP_printk("fsi-gpio%d: Sending SAME_ADR",
__entry->master_idx)
);
#endif /* _TRACE_FSI_MASTER_GPIO_H */
#include <trace/define_trace.h>

58
include/uapi/linux/fsi.h Normal file
View File

@ -0,0 +1,58 @@
/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
#ifndef _UAPI_LINUX_FSI_H
#define _UAPI_LINUX_FSI_H
#include <linux/types.h>
#include <linux/ioctl.h>
/*
* /dev/scom "raw" ioctl interface
*
* The driver supports a high level "read/write" interface which
* handles retries and converts the status to Linux error codes,
* however low level tools an debugger need to access the "raw"
* HW status information and interpret it themselves, so this
* ioctl interface is also provided for their use case.
*/
/* Structure for SCOM read/write */
struct scom_access {
__u64 addr; /* SCOM address, supports indirect */
__u64 data; /* SCOM data (in for write, out for read) */
__u64 mask; /* Data mask for writes */
__u32 intf_errors; /* Interface error flags */
#define SCOM_INTF_ERR_PARITY 0x00000001 /* Parity error */
#define SCOM_INTF_ERR_PROTECTION 0x00000002 /* Blocked by secure boot */
#define SCOM_INTF_ERR_ABORT 0x00000004 /* PIB reset during access */
#define SCOM_INTF_ERR_UNKNOWN 0x80000000 /* Unknown error */
/*
* Note: Any other bit set in intf_errors need to be considered as an
* error. Future implementations may define new error conditions. The
* pib_status below is only valid if intf_errors is 0.
*/
__u8 pib_status; /* 3-bit PIB status */
#define SCOM_PIB_SUCCESS 0 /* Access successful */
#define SCOM_PIB_BLOCKED 1 /* PIB blocked, pls retry */
#define SCOM_PIB_OFFLINE 2 /* Chiplet offline */
#define SCOM_PIB_PARTIAL 3 /* Partial good */
#define SCOM_PIB_BAD_ADDR 4 /* Invalid address */
#define SCOM_PIB_CLK_ERR 5 /* Clock error */
#define SCOM_PIB_PARITY_ERR 6 /* Parity error on the PIB bus */
#define SCOM_PIB_TIMEOUT 7 /* Bus timeout */
__u8 pad;
};
/* Flags for SCOM check */
#define SCOM_CHECK_SUPPORTED 0x00000001 /* Interface supported */
#define SCOM_CHECK_PROTECTED 0x00000002 /* Interface blocked by secure boot */
/* Flags for SCOM reset */
#define SCOM_RESET_INTF 0x00000001 /* Reset interface */
#define SCOM_RESET_PIB 0x00000002 /* Reset PIB */
#define FSI_SCOM_CHECK _IOR('s', 0x00, __u32)
#define FSI_SCOM_READ _IOWR('s', 0x01, struct scom_access)
#define FSI_SCOM_WRITE _IOWR('s', 0x02, struct scom_access)
#define FSI_SCOM_RESET _IOW('s', 0x03, __u32)
#endif /* _UAPI_LINUX_FSI_H */