linux/drivers/infiniband/hw/hfi1/qsfp.c

// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
/*
 * Copyright(c) 2015, 2016 Intel Corporation.
 */

#include <linux/delay.h>
#include <linux/pci.h>
#include <linux/vmalloc.h>

#include "hfi.h"

/* for the given bus number, return the CSR for reading an i2c line */
static inline u32 i2c_in_csr(u32 bus_num)
{ … }

/* for the given bus number, return the CSR for writing an i2c line */
static inline u32 i2c_oe_csr(u32 bus_num)
{ … }

static void hfi1_setsda(void *data, int state)
{ … }

static void hfi1_setscl(void *data, int state)
{ … }

static int hfi1_getsda(void *data)
{ … }

static int hfi1_getscl(void *data)
{ … }

/*
 * Allocate and initialize the given i2c bus number.
 * Returns NULL on failure.
 */
static struct hfi1_i2c_bus *init_i2c_bus(struct hfi1_devdata *dd,
					 struct hfi1_asic_data *ad, int num)
{ … }

/*
 * Initialize i2c buses.
 * Return 0 on success, -errno on error.
 */
int set_up_i2c(struct hfi1_devdata *dd, struct hfi1_asic_data *ad)
{
	ad->i2c_bus0 = init_i2c_bus(dd, ad, 0);
	ad->i2c_bus1 = init_i2c_bus(dd, ad, 1);
	if (!ad->i2c_bus0 || !ad->i2c_bus1)
		return -ENOMEM;
	return 0;
};

static void clean_i2c_bus(struct hfi1_i2c_bus *bus)
{ … }

void clean_up_i2c(struct hfi1_devdata *dd, struct hfi1_asic_data *ad)
{ … }

static int i2c_bus_write(struct hfi1_devdata *dd, struct hfi1_i2c_bus *i2c,
			 u8 slave_addr, int offset, int offset_size,
			 u8 *data, u16 len)
{ … }

static int i2c_bus_read(struct hfi1_devdata *dd, struct hfi1_i2c_bus *bus,
			u8 slave_addr, int offset, int offset_size,
			u8 *data, u16 len)
{ … }

/*
 * Raw i2c write.  No set-up or lock checking.
 *
 * Return 0 on success, -errno on error.
 */
static int __i2c_write(struct hfi1_pportdata *ppd, u32 target, int i2c_addr,
		       int offset, void *bp, int len)
{ … }

/*
 * Caller must hold the i2c chain resource.
 *
 * Return number of bytes written, or -errno.
 */
int i2c_write(struct hfi1_pportdata *ppd, u32 target, int i2c_addr, int offset,
	      void *bp, int len)
{ … }

/*
 * Raw i2c read.  No set-up or lock checking.
 *
 * Return 0 on success, -errno on error.
 */
static int __i2c_read(struct hfi1_pportdata *ppd, u32 target, int i2c_addr,
		      int offset, void *bp, int len)
{ … }

/*
 * Caller must hold the i2c chain resource.
 *
 * Return number of bytes read, or -errno.
 */
int i2c_read(struct hfi1_pportdata *ppd, u32 target, int i2c_addr, int offset,
	     void *bp, int len)
{ … }

/*
 * Write page n, offset m of QSFP memory as defined by SFF 8636
 * by writing @addr = ((256 * n) + m)
 *
 * Caller must hold the i2c chain resource.
 *
 * Return number of bytes written or -errno.
 */
int qsfp_write(struct hfi1_pportdata *ppd, u32 target, int addr, void *bp,
	       int len)
{ … }

/*
 * Perform a stand-alone single QSFP write.  Acquire the resource, do the
 * write, then release the resource.
 */
int one_qsfp_write(struct hfi1_pportdata *ppd, u32 target, int addr, void *bp,
		   int len)
{ … }

/*
 * Access page n, offset m of QSFP memory as defined by SFF 8636
 * by reading @addr = ((256 * n) + m)
 *
 * Caller must hold the i2c chain resource.
 *
 * Return the number of bytes read or -errno.
 */
int qsfp_read(struct hfi1_pportdata *ppd, u32 target, int addr, void *bp,
	      int len)
{ … }

/*
 * Perform a stand-alone single QSFP read.  Acquire the resource, do the
 * read, then release the resource.
 */
int one_qsfp_read(struct hfi1_pportdata *ppd, u32 target, int addr, void *bp,
		  int len)
{ … }

/*
 * This function caches the QSFP memory range in 128 byte chunks.
 * As an example, the next byte after address 255 is byte 128 from
 * upper page 01H (if existing) rather than byte 0 from lower page 00H.
 * Access page n, offset m of QSFP memory as defined by SFF 8636
 * in the cache by reading byte ((128 * n) + m)
 * The calls to qsfp_{read,write} in this function correctly handle the
 * address map difference between this mapping and the mapping implemented
 * by those functions
 *
 * The caller must be holding the QSFP i2c chain resource.
 */
int refresh_qsfp_cache(struct hfi1_pportdata *ppd, struct qsfp_data *cp)
{ … }

const char * const hfi1_qsfp_devtech[16] = …;

#define QSFP_DUMP_CHUNK …
#define QSFP_DEFAULT_HDR_CNT …

#define QSFP_PWR(pbyte) …
#define QSFP_HIGH_PWR(pbyte) …
/* For use with QSFP_HIGH_PWR macro */
#define QSFP_HIGH_PWR_UNUSED …

/*
 * Takes power class byte [Page 00 Byte 129] in SFF 8636
 * Returns power class as integer (1 through 7, per SFF 8636 rev 2.4)
 */
int get_qsfp_power_class(u8 power_byte)
{ … }

int qsfp_mod_present(struct hfi1_pportdata *ppd)
{ … }

/*
 * This function maps QSFP memory addresses in 128 byte chunks in the following
 * fashion per the CableInfo SMA query definition in the IBA 1.3 spec/OPA Gen 1
 * spec
 * For addr 000-127, lower page 00h
 * For addr 128-255, upper page 00h
 * For addr 256-383, upper page 01h
 * For addr 384-511, upper page 02h
 * For addr 512-639, upper page 03h
 *
 * For addresses beyond this range, it returns the invalid range of data buffer
 * set to 0.
 * For upper pages that are optional, if they are not valid, returns the
 * particular range of bytes in the data buffer set to 0.
 */
int get_cable_info(struct hfi1_devdata *dd, u32 port_num, u32 addr, u32 len,
		   u8 *data)
{ … }

static const char *pwr_codes[8] = …;

int qsfp_dump(struct hfi1_pportdata *ppd, char *buf, int len)
{ … }