drivers/fsi: Add hub master support
Add an engine driver to expose a "hub" FSI master - which has a set of control registers in the engine address space, and uses a chunk of the slave address space for actual FSI communication. Additional changes from Jeremy Kerr <jk@ozlabs.org>. Signed-off-by: Christopher Bostic <cbostic@linux.vnet.ibm.com> Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Christopher Bostic
Greg Kroah-Hartman
parent
680ca6dcf5
commit
7f9e8f7670
|
|
@ -20,6 +20,14 @@ config FSI_MASTER_GPIO
|
|||
---help---
|
||||
This option enables a FSI master driver using GPIO lines.
|
||||
|
||||
config FSI_MASTER_HUB
|
||||
tristate "FSI hub master"
|
||||
---help---
|
||||
This option enables a FSI hub master driver. Hub is a type of FSI
|
||||
master that is connected to the upstream master via a slave. Hubs
|
||||
allow chaining of FSI links to an arbitrary depth. This allows for
|
||||
a high target device fanout.
|
||||
|
||||
config FSI_SCOM
|
||||
tristate "SCOM FSI client device driver"
|
||||
---help---
|
||||
|
|
|
|||
|
|
@ -1,4 +1,5 @@
|
|||
|
||||
obj-$(CONFIG_FSI) += fsi-core.o
|
||||
obj-$(CONFIG_FSI_MASTER_HUB) += fsi-master-hub.o
|
||||
obj-$(CONFIG_FSI_MASTER_GPIO) += fsi-master-gpio.o
|
||||
obj-$(CONFIG_FSI_SCOM) += fsi-scom.o
|
||||
|
|
|
|||
|
|
@ -0,0 +1,327 @@
|
|||
/*
|
||||
* FSI hub master driver
|
||||
*
|
||||
* Copyright (C) IBM Corporation 2016
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2 as
|
||||
* published by the Free Software Foundation.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*/
|
||||
|
||||
#include <linux/delay.h>
|
||||
#include <linux/fsi.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/slab.h>
|
||||
|
||||
#include "fsi-master.h"
|
||||
|
||||
/* 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_MRESP0 0xd0 /* W: Port reset */
|
||||
#define FSI_MESRB0 0x1d0 /* R: Master error status */
|
||||
#define FSI_MRESB0 0x1d0 /* W: Reset bridge */
|
||||
#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_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 */
|
||||
|
||||
/* MRESB: 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_ENGID_HUB_MASTER 0x1c
|
||||
#define FSI_HUB_LINK_OFFSET 0x80000
|
||||
#define FSI_HUB_LINK_SIZE 0x80000
|
||||
#define FSI_HUB_MASTER_MAX_LINKS 8
|
||||
|
||||
#define FSI_LINK_ENABLE_SETUP_TIME 10 /* in mS */
|
||||
|
||||
/*
|
||||
* FSI hub master support
|
||||
*
|
||||
* A hub master increases the number of potential target devices that the
|
||||
* primary FSI master can access. For each link a primary master supports,
|
||||
* each of those links can in turn be chained to a hub master with multiple
|
||||
* links of its own.
|
||||
*
|
||||
* The hub is controlled by a set of control registers exposed as a regular fsi
|
||||
* device (the hub->upstream device), and provides access to the downstream FSI
|
||||
* bus as through an address range on the slave itself (->addr and ->size).
|
||||
*
|
||||
* [This differs from "cascaded" masters, which expose the entire downstream
|
||||
* bus entirely through the fsi device address range, and so have a smaller
|
||||
* accessible address space.]
|
||||
*/
|
||||
struct fsi_master_hub {
|
||||
struct fsi_master master;
|
||||
struct fsi_device *upstream;
|
||||
uint32_t addr, size; /* slave-relative addr of */
|
||||
/* master address space */
|
||||
};
|
||||
|
||||
#define to_fsi_master_hub(m) container_of(m, struct fsi_master_hub, master)
|
||||
|
||||
static int hub_master_read(struct fsi_master *master, int link,
|
||||
uint8_t id, uint32_t addr, void *val, size_t size)
|
||||
{
|
||||
struct fsi_master_hub *hub = to_fsi_master_hub(master);
|
||||
|
||||
if (id != 0)
|
||||
return -EINVAL;
|
||||
|
||||
addr += hub->addr + (link * FSI_HUB_LINK_SIZE);
|
||||
return fsi_slave_read(hub->upstream->slave, addr, val, size);
|
||||
}
|
||||
|
||||
static int hub_master_write(struct fsi_master *master, int link,
|
||||
uint8_t id, uint32_t addr, const void *val, size_t size)
|
||||
{
|
||||
struct fsi_master_hub *hub = to_fsi_master_hub(master);
|
||||
|
||||
if (id != 0)
|
||||
return -EINVAL;
|
||||
|
||||
addr += hub->addr + (link * FSI_HUB_LINK_SIZE);
|
||||
return fsi_slave_write(hub->upstream->slave, addr, val, size);
|
||||
}
|
||||
|
||||
static int hub_master_break(struct fsi_master *master, int link)
|
||||
{
|
||||
uint32_t addr, cmd;
|
||||
|
||||
addr = 0x4;
|
||||
cmd = cpu_to_be32(0xc0de0000);
|
||||
|
||||
return hub_master_write(master, link, 0, addr, &cmd, sizeof(cmd));
|
||||
}
|
||||
|
||||
static int hub_master_link_enable(struct fsi_master *master, int link)
|
||||
{
|
||||
struct fsi_master_hub *hub = to_fsi_master_hub(master);
|
||||
int idx, bit;
|
||||
__be32 reg;
|
||||
int rc;
|
||||
|
||||
idx = link / 32;
|
||||
bit = link % 32;
|
||||
|
||||
reg = cpu_to_be32(0x80000000 >> bit);
|
||||
|
||||
rc = fsi_device_write(hub->upstream, FSI_MSENP0 + (4 * idx), ®, 4);
|
||||
|
||||
mdelay(FSI_LINK_ENABLE_SETUP_TIME);
|
||||
|
||||
fsi_device_read(hub->upstream, FSI_MENP0 + (4 * idx), ®, 4);
|
||||
|
||||
return rc;
|
||||
}
|
||||
|
||||
static void hub_master_release(struct device *dev)
|
||||
{
|
||||
struct fsi_master_hub *hub = to_fsi_master_hub(dev_to_fsi_master(dev));
|
||||
|
||||
kfree(hub);
|
||||
}
|
||||
|
||||
/* mmode encoders */
|
||||
static inline u32 fsi_mmode_crs0(u32 x)
|
||||
{
|
||||
return (x & FSI_MMODE_CRS0MASK) << FSI_MMODE_CRS0SHFT;
|
||||
}
|
||||
|
||||
static inline u32 fsi_mmode_crs1(u32 x)
|
||||
{
|
||||
return (x & FSI_MMODE_CRS1MASK) << FSI_MMODE_CRS1SHFT;
|
||||
}
|
||||
|
||||
static int hub_master_init(struct fsi_master_hub *hub)
|
||||
{
|
||||
struct fsi_device *dev = hub->upstream;
|
||||
__be32 reg;
|
||||
int rc;
|
||||
|
||||
reg = cpu_to_be32(FSI_MRESP_RST_ALL_MASTER | FSI_MRESP_RST_ALL_LINK
|
||||
| FSI_MRESP_RST_MCR | FSI_MRESP_RST_PYE);
|
||||
rc = fsi_device_write(dev, FSI_MRESP0, ®, sizeof(reg));
|
||||
if (rc)
|
||||
return rc;
|
||||
|
||||
/* Initialize the MFSI (hub master) engine */
|
||||
reg = cpu_to_be32(FSI_MRESP_RST_ALL_MASTER | FSI_MRESP_RST_ALL_LINK
|
||||
| FSI_MRESP_RST_MCR | FSI_MRESP_RST_PYE);
|
||||
rc = fsi_device_write(dev, FSI_MRESP0, ®, sizeof(reg));
|
||||
if (rc)
|
||||
return rc;
|
||||
|
||||
reg = cpu_to_be32(FSI_MECTRL_EOAE | FSI_MECTRL_P8_AUTO_TERM);
|
||||
rc = fsi_device_write(dev, FSI_MECTRL, ®, sizeof(reg));
|
||||
if (rc)
|
||||
return rc;
|
||||
|
||||
reg = cpu_to_be32(FSI_MMODE_EIP | FSI_MMODE_ECRC | FSI_MMODE_EPC
|
||||
| fsi_mmode_crs0(1) | fsi_mmode_crs1(1)
|
||||
| FSI_MMODE_P8_TO_LSB);
|
||||
rc = fsi_device_write(dev, FSI_MMODE, ®, sizeof(reg));
|
||||
if (rc)
|
||||
return rc;
|
||||
|
||||
reg = cpu_to_be32(0xffff0000);
|
||||
rc = fsi_device_write(dev, FSI_MDLYR, ®, sizeof(reg));
|
||||
if (rc)
|
||||
return rc;
|
||||
|
||||
reg = ~0;
|
||||
rc = fsi_device_write(dev, FSI_MSENP0, ®, sizeof(reg));
|
||||
if (rc)
|
||||
return rc;
|
||||
|
||||
/* Leave enabled long enough for master logic to set up */
|
||||
mdelay(FSI_LINK_ENABLE_SETUP_TIME);
|
||||
|
||||
rc = fsi_device_write(dev, FSI_MCENP0, ®, sizeof(reg));
|
||||
if (rc)
|
||||
return rc;
|
||||
|
||||
rc = fsi_device_read(dev, FSI_MAEB, ®, sizeof(reg));
|
||||
if (rc)
|
||||
return rc;
|
||||
|
||||
reg = cpu_to_be32(FSI_MRESP_RST_ALL_MASTER | FSI_MRESP_RST_ALL_LINK);
|
||||
rc = fsi_device_write(dev, FSI_MRESP0, ®, sizeof(reg));
|
||||
if (rc)
|
||||
return rc;
|
||||
|
||||
rc = fsi_device_read(dev, FSI_MLEVP0, ®, sizeof(reg));
|
||||
if (rc)
|
||||
return rc;
|
||||
|
||||
/* Reset the master bridge */
|
||||
reg = cpu_to_be32(FSI_MRESB_RST_GEN);
|
||||
rc = fsi_device_write(dev, FSI_MRESB0, ®, sizeof(reg));
|
||||
if (rc)
|
||||
return rc;
|
||||
|
||||
reg = cpu_to_be32(FSI_MRESB_RST_ERR);
|
||||
return fsi_device_write(dev, FSI_MRESB0, ®, sizeof(reg));
|
||||
}
|
||||
|
||||
static int hub_master_probe(struct device *dev)
|
||||
{
|
||||
struct fsi_device *fsi_dev = to_fsi_dev(dev);
|
||||
struct fsi_master_hub *hub;
|
||||
uint32_t reg, links;
|
||||
__be32 __reg;
|
||||
int rc;
|
||||
|
||||
rc = fsi_device_read(fsi_dev, FSI_MVER, &__reg, sizeof(__reg));
|
||||
if (rc)
|
||||
return rc;
|
||||
|
||||
reg = be32_to_cpu(__reg);
|
||||
links = (reg >> 8) & 0xff;
|
||||
dev_info(dev, "hub version %08x (%d links)\n", reg, links);
|
||||
|
||||
rc = fsi_slave_claim_range(fsi_dev->slave, FSI_HUB_LINK_OFFSET,
|
||||
FSI_HUB_LINK_SIZE * links);
|
||||
if (rc) {
|
||||
dev_err(dev, "can't claim slave address range for links");
|
||||
return rc;
|
||||
}
|
||||
|
||||
hub = kzalloc(sizeof(*hub), GFP_KERNEL);
|
||||
if (!hub) {
|
||||
rc = -ENOMEM;
|
||||
goto err_release;
|
||||
}
|
||||
|
||||
hub->addr = FSI_HUB_LINK_OFFSET;
|
||||
hub->size = FSI_HUB_LINK_SIZE * links;
|
||||
hub->upstream = fsi_dev;
|
||||
|
||||
hub->master.dev.parent = dev;
|
||||
hub->master.dev.release = hub_master_release;
|
||||
|
||||
hub->master.n_links = links;
|
||||
hub->master.read = hub_master_read;
|
||||
hub->master.write = hub_master_write;
|
||||
hub->master.send_break = hub_master_break;
|
||||
hub->master.link_enable = hub_master_link_enable;
|
||||
|
||||
dev_set_drvdata(dev, hub);
|
||||
|
||||
hub_master_init(hub);
|
||||
|
||||
rc = fsi_master_register(&hub->master);
|
||||
if (!rc)
|
||||
return 0;
|
||||
|
||||
kfree(hub);
|
||||
err_release:
|
||||
fsi_slave_release_range(fsi_dev->slave, FSI_HUB_LINK_OFFSET,
|
||||
FSI_HUB_LINK_SIZE * links);
|
||||
return rc;
|
||||
}
|
||||
|
||||
static int hub_master_remove(struct device *dev)
|
||||
{
|
||||
struct fsi_master_hub *hub = dev_get_drvdata(dev);
|
||||
|
||||
fsi_master_unregister(&hub->master);
|
||||
fsi_slave_release_range(hub->upstream->slave, hub->addr, hub->size);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct fsi_device_id hub_master_ids[] = {
|
||||
{
|
||||
.engine_type = FSI_ENGID_HUB_MASTER,
|
||||
.version = FSI_VERSION_ANY,
|
||||
},
|
||||
{ 0 }
|
||||
};
|
||||
|
||||
static struct fsi_driver hub_master_driver = {
|
||||
.id_table = hub_master_ids,
|
||||
.drv = {
|
||||
.name = "fsi-master-hub",
|
||||
.bus = &fsi_bus_type,
|
||||
.probe = hub_master_probe,
|
||||
.remove = hub_master_remove,
|
||||
}
|
||||
};
|
||||
|
||||
module_fsi_driver(hub_master_driver);
|
||||
MODULE_LICENSE("GPL");
|
||||
Loading…
Reference in New Issue