mirror of
https://github.com/torvalds/linux.git
synced 2024-11-24 05:02:12 +00:00
8bcd06d0cb
The FSI master registers are common to the hub and AST2600 master (and the FSP2, if someone was to upstream a driver for that). Add defines to the fsi-master.h header, and introduce headings to delineate the existing low level details. Acked-by: Andrew Jeffery <andrew@aj.id.au> Acked-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Joel Stanley <joel@jms.id.au> Link: https://lore.kernel.org/r/20191108051945.7109-8-joel@jms.id.au Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
161 lines
5.8 KiB
C
161 lines
5.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
/*
|
|
* FSI master definitions. These comprise the core <--> master interface,
|
|
* to allow the core to interact with the (hardware-specific) masters.
|
|
*
|
|
* Copyright (C) IBM Corporation 2016
|
|
*/
|
|
|
|
#ifndef DRIVERS_FSI_MASTER_H
|
|
#define DRIVERS_FSI_MASTER_H
|
|
|
|
#include <linux/device.h>
|
|
#include <linux/mutex.h>
|
|
|
|
/*
|
|
* Master registers
|
|
*
|
|
* These are used by hardware masters, such as the one in the FSP2, AST2600 and
|
|
* the hub master in POWER processors.
|
|
*/
|
|
|
|
/* Control Registers */
|
|
#define FSI_MMODE 0x0 /* R/W: mode */
|
|
#define FSI_MDLYR 0x4 /* R/W: delay */
|
|
#define FSI_MCRSP 0x8 /* R/W: clock rate */
|
|
#define FSI_MENP0 0x10 /* R/W: enable */
|
|
#define FSI_MLEVP0 0x18 /* R: plug detect */
|
|
#define FSI_MSENP0 0x18 /* S: Set enable */
|
|
#define FSI_MCENP0 0x20 /* C: Clear enable */
|
|
#define FSI_MAEB 0x70 /* R: Error address */
|
|
#define FSI_MVER 0x74 /* R: master version/type */
|
|
#define FSI_MSTAP0 0xd0 /* R: Port status */
|
|
#define FSI_MRESP0 0xd0 /* W: Port reset */
|
|
#define FSI_MESRB0 0x1d0 /* R: Master error status */
|
|
#define FSI_MRESB0 0x1d0 /* W: Reset bridge */
|
|
#define FSI_MSCSB0 0x1d4 /* R: Master sub command stack */
|
|
#define FSI_MATRB0 0x1d8 /* R: Master address trace */
|
|
#define FSI_MDTRB0 0x1dc /* R: Master data trace */
|
|
#define FSI_MECTRL 0x2e0 /* W: Error control */
|
|
|
|
/* MMODE: Mode control */
|
|
#define FSI_MMODE_EIP 0x80000000 /* Enable interrupt polling */
|
|
#define FSI_MMODE_ECRC 0x40000000 /* Enable error recovery */
|
|
#define FSI_MMODE_RELA 0x20000000 /* Enable relative address commands */
|
|
#define FSI_MMODE_EPC 0x10000000 /* Enable parity checking */
|
|
#define FSI_MMODE_P8_TO_LSB 0x00000010 /* Timeout value LSB */
|
|
/* MSB=1, LSB=0 is 0.8 ms */
|
|
/* MSB=0, LSB=1 is 0.9 ms */
|
|
#define FSI_MMODE_CRS0SHFT 18 /* Clk rate selection 0 shift */
|
|
#define FSI_MMODE_CRS0MASK 0x3ff /* Clk rate selection 0 mask */
|
|
#define FSI_MMODE_CRS1SHFT 8 /* Clk rate selection 1 shift */
|
|
#define FSI_MMODE_CRS1MASK 0x3ff /* Clk rate selection 1 mask */
|
|
|
|
/* MRESB: Reset brindge */
|
|
#define FSI_MRESB_RST_GEN 0x80000000 /* General reset */
|
|
#define FSI_MRESB_RST_ERR 0x40000000 /* Error Reset */
|
|
|
|
/* MRESP: Reset port */
|
|
#define FSI_MRESP_RST_ALL_MASTER 0x20000000 /* Reset all FSI masters */
|
|
#define FSI_MRESP_RST_ALL_LINK 0x10000000 /* Reset all FSI port contr. */
|
|
#define FSI_MRESP_RST_MCR 0x08000000 /* Reset FSI master reg. */
|
|
#define FSI_MRESP_RST_PYE 0x04000000 /* Reset FSI parity error */
|
|
#define FSI_MRESP_RST_ALL 0xfc000000 /* Reset any error */
|
|
|
|
/* MECTRL: Error control */
|
|
#define FSI_MECTRL_EOAE 0x8000 /* Enable machine check when */
|
|
/* master 0 in error */
|
|
#define FSI_MECTRL_P8_AUTO_TERM 0x4000 /* Auto terminate */
|
|
|
|
#define FSI_HUB_LINK_OFFSET 0x80000
|
|
#define FSI_HUB_LINK_SIZE 0x80000
|
|
#define FSI_HUB_MASTER_MAX_LINKS 8
|
|
|
|
/*
|
|
* Protocol definitions
|
|
*
|
|
* These are used by low level masters that bit-bang out the protocol
|
|
*/
|
|
|
|
/* 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
|
|
|
|
/*
|
|
* Structures and function prototypes
|
|
*
|
|
* These are common to all masters
|
|
*/
|
|
|
|
struct fsi_master {
|
|
struct device dev;
|
|
int idx;
|
|
int n_links;
|
|
int flags;
|
|
struct mutex scan_lock;
|
|
int (*read)(struct fsi_master *, int link, uint8_t id,
|
|
uint32_t addr, void *val, size_t size);
|
|
int (*write)(struct fsi_master *, int link, uint8_t id,
|
|
uint32_t addr, const void *val, size_t size);
|
|
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)
|
|
|
|
/**
|
|
* fsi_master registration & lifetime: the fsi_master_register() and
|
|
* fsi_master_unregister() functions will take ownership of the master, and
|
|
* ->dev in particular. The registration path performs a get_device(), which
|
|
* takes the first reference on the device. Similarly, the unregistration path
|
|
* performs a put_device(), which may well drop the last reference.
|
|
*
|
|
* This means that master implementations *may* need to hold their own
|
|
* reference (via get_device()) on master->dev. In particular, if the device's
|
|
* ->release callback frees the fsi_master, then fsi_master_unregister will
|
|
* invoke this free if no other reference is held.
|
|
*
|
|
* The same applies for the error path of fsi_master_register; if the call
|
|
* fails, dev->release will have been invoked.
|
|
*/
|
|
extern int fsi_master_register(struct fsi_master *master);
|
|
extern void fsi_master_unregister(struct fsi_master *master);
|
|
|
|
extern int fsi_master_rescan(struct fsi_master *master);
|
|
|
|
#endif /* DRIVERS_FSI_MASTER_H */
|