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Message-ID: <20070831151608.GB27021@ld0162-tx32.am.freescale.net>
Date: Fri, 31 Aug 2007 10:16:08 -0500
From: Scott Wood <scottwood@...escale.com>
To: Jeff Garzik <jgarzik@...ox.com>
Cc: netdev@...r.kernel.org, linuxppc-dev@...abs.org,
Paul Mackerras <paulus@...ba.org>
Subject: Re: [PATCH 1/7] Generic bitbanged MDIO library
On Fri, Aug 31, 2007 at 09:23:04AM -0400, Jeff Garzik wrote:
> I cannot ACK this, nor do I want to see it merged, until users appear
> and have been reviewed alongside this. I do not see any fs_enet patches
> that actually use this.
The fs_enet patchset does use it in mii-bitbang.c, in patch 6/7 (or 7/8
in the revised patchset). I'll also be using it on the ep8248e board
(which is why I factored it out), which I'll attach below.
> * the delay (where you call ndelay()) is not guaranteed without a flush
> of some sort
Hmm... I'm inclined to push that into the client's implementation of set
mdc/data, primarily because there's no get mdc to do a read-back
generically.
> * how widely applicable is this "generic" library?
It implements MDIO as described in the ethernet specification; there
should be no implementation dependencies.
> have you converted any non-embedded drivers over to it?
No; most hardware doesn't need bitbanging. Sunhme does, but I don't have
hardware to test a conversion.
Here's the ep8248e user of the bitbang code:
/*
* Embedded Planet EP8248E support
*
* Copyright 2007 Freescale Semiconductor, Inc.
* Author: Scott Wood <scottwood@...escale.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*/
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/fsl_devices.h>
#include <linux/mdio-bitbang.h>
#include <linux/of_platform.h>
#include <asm/io.h>
#include <asm/cpm2.h>
#include <asm/udbg.h>
#include <asm/machdep.h>
#include <asm/time.h>
#include <asm/mpc8260.h>
#include <sysdev/fsl_soc.h>
#include <sysdev/cpm2_pic.h>
#include "pq2.h"
static u8 __iomem *ep8248e_bcsr;
static struct device_node *ep8248e_bcsr_node;
#define BCSR7_SCC2_ENABLE 0x10
#define BCSR8_PHY1_ENABLE 0x80
#define BCSR8_PHY1_POWER 0x40
#define BCSR8_PHY2_ENABLE 0x20
#define BCSR8_PHY2_POWER 0x10
#define BCSR8_MDIO_READ 0x04
#define BCSR8_MDIO_CLOCK 0x02
#define BCSR8_MDIO_DATA 0x01
#define BCSR9_USB_ENABLE 0x80
#define BCSR9_USB_POWER 0x40
#define BCSR9_USB_HOST 0x20
#define BCSR9_USB_FULL_SPEED_TARGET 0x10
static void __init ep8248_pic_init(void)
{
struct device_node *np = of_find_compatible_node(NULL, NULL, "fsl,pq2-pic");
if (!np) {
printk(KERN_ERR "PIC init: can not find cpm-pic node\n");
return;
}
cpm2_pic_init(np);
of_node_put(np);
}
static void ep8248e_set_mdc(struct mdio_bitbang_ctrl *ctrl, int level)
{
if (level)
setbits8(&ep8248e_bcsr[8], BCSR8_MDIO_CLOCK);
else
clrbits8(&ep8248e_bcsr[8], BCSR8_MDIO_CLOCK);
/* Flush the write before delaying. */
in_8(&ep8248e_bcsr[8]);
}
static void ep8248e_set_mdio_dir(struct mdio_bitbang_ctrl *ctrl, int output)
{
if (output)
clrbits8(&ep8248e_bcsr[8], BCSR8_MDIO_READ);
else
setbits8(&ep8248e_bcsr[8], BCSR8_MDIO_READ);
/* Flush the write before delaying. */
in_8(&ep8248e_bcsr[8]);
}
static void ep8248e_set_mdio_data(struct mdio_bitbang_ctrl *ctrl, int data)
{
if (data)
setbits8(&ep8248e_bcsr[8], BCSR8_MDIO_DATA);
else
clrbits8(&ep8248e_bcsr[8], BCSR8_MDIO_DATA);
/* Flush the write before delaying. */
in_8(&ep8248e_bcsr[8]);
}
static int ep8248e_get_mdio_data(struct mdio_bitbang_ctrl *ctrl)
{
return in_8(&ep8248e_bcsr[8]) & BCSR8_MDIO_DATA;
}
static struct mdio_bitbang_ops ep8248e_mdio_ops = {
.set_mdc = ep8248e_set_mdc,
.set_mdio_dir = ep8248e_set_mdio_dir,
.set_mdio_data = ep8248e_set_mdio_data,
.get_mdio_data = ep8248e_get_mdio_data,
.owner = THIS_MODULE,
};
static struct mdio_bitbang_ctrl ep8248e_mdio_ctrl = {
.ops = &ep8248e_mdio_ops,
};
static int __devinit ep8248e_mdio_probe(struct of_device *ofdev,
const struct of_device_id *match)
{
struct mii_bus *bus;
struct resource res;
int ret, i;
if (of_get_parent(ofdev->node) != ep8248e_bcsr_node)
return -ENODEV;
ret = of_address_to_resource(ofdev->node, 0, &res);
if (ret)
return ret;
bus = alloc_mdio_bitbang(&ep8248e_mdio_ctrl);
if (!bus)
return -ENOMEM;
bus->phy_mask = 0;
bus->irq = kmalloc(sizeof(int) * PHY_MAX_ADDR, GFP_KERNEL);
for (i = 0; i < PHY_MAX_ADDR; i++)
bus->irq[i] = -1;
bus->name = "ep8248e-mdio-bitbang";
bus->dev = &ofdev->dev;
bus->id = res.start;
return mdiobus_register(bus);
}
static int ep8248e_mdio_remove(struct of_device *ofdev)
{
BUG();
return 0;
}
static struct of_device_id ep8248e_mdio_match[] = {
{
.compatible = "fsl,ep8248e-mdio-bitbang",
},
{},
};
static struct of_platform_driver ep8248e_mdio_driver = {
.name = "ep8248e-mdio-bitbang",
.match_table = ep8248e_mdio_match,
.probe = ep8248e_mdio_probe,
.remove = ep8248e_mdio_remove,
};
struct cpm_pin {
int port, pin, flags;
};
static struct cpm_pin ep8248_pins[] = {
/* SMC1 */
{2, 4, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
{2, 5, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},
/* SCC1 */
{2, 14, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
{2, 15, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
{3, 29, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},
{3, 30, CPM_PIN_OUTPUT | CPM_PIN_SECONDARY},
{3, 31, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
/* FCC1 */
{0, 14, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
{0, 15, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
{0, 16, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
{0, 17, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
{0, 18, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},
{0, 19, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},
{0, 20, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},
{0, 21, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},
{0, 26, CPM_PIN_INPUT | CPM_PIN_SECONDARY},
{0, 27, CPM_PIN_INPUT | CPM_PIN_SECONDARY},
{0, 28, CPM_PIN_OUTPUT | CPM_PIN_SECONDARY},
{0, 29, CPM_PIN_OUTPUT | CPM_PIN_SECONDARY},
{0, 30, CPM_PIN_INPUT | CPM_PIN_SECONDARY},
{0, 31, CPM_PIN_INPUT | CPM_PIN_SECONDARY},
{2, 21, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
{2, 22, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
/* FCC2 */
{1, 18, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
{1, 19, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
{1, 20, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
{1, 21, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
{1, 22, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},
{1, 23, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},
{1, 24, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},
{1, 25, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},
{1, 26, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
{1, 27, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
{1, 28, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
{1, 29, CPM_PIN_OUTPUT | CPM_PIN_SECONDARY},
{1, 30, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
{1, 31, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},
{2, 18, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
{2, 19, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
/* I2C */
{4, 14, CPM_PIN_INPUT | CPM_PIN_SECONDARY},
{4, 15, CPM_PIN_INPUT | CPM_PIN_SECONDARY},
/* USB */
{2, 10, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
{2, 11, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
{2, 20, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},
{2, 24, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
{3, 23, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},
{3, 24, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},
{3, 25, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
};
static void __init init_ioports(void)
{
int i;
for (i = 0; i < ARRAY_SIZE(ep8248_pins); i++) {
struct cpm_pin *pin = &ep8248_pins[i];
cpm2_set_pin(pin->port, pin->pin, pin->flags);
}
cpm2_smc_clk_setup(CPM_CLK_SMC1, CPM_BRG7);
cpm2_clk_setup(CPM_CLK_SCC1, CPM_BRG1, CPM_CLK_RX);
cpm2_clk_setup(CPM_CLK_SCC1, CPM_BRG1, CPM_CLK_TX);
cpm2_clk_setup(CPM_CLK_SCC3, CPM_CLK8, CPM_CLK_TX); /* USB */
cpm2_clk_setup(CPM_CLK_FCC1, CPM_CLK11, CPM_CLK_RX);
cpm2_clk_setup(CPM_CLK_FCC1, CPM_CLK10, CPM_CLK_TX);
cpm2_clk_setup(CPM_CLK_FCC2, CPM_CLK13, CPM_CLK_RX);
cpm2_clk_setup(CPM_CLK_FCC2, CPM_CLK14, CPM_CLK_TX);
}
static void __init ep8248_setup_arch(void)
{
if (ppc_md.progress)
ppc_md.progress("ep8248_setup_arch()", 0);
cpm2_reset();
/* When this is set, snooping CPM DMA from RAM causes
* machine checks. See erratum SIU18.
*/
clrbits32(&cpm2_immr->im_siu_conf.siu_82xx.sc_bcr, MPC82XX_BCR_PLDP);
ep8248e_bcsr_node =
of_find_compatible_node(NULL, NULL, "fsl,ep8248e-bcsr");
if (!ep8248e_bcsr_node) {
printk(KERN_ERR "No bcsr in device tree\n");
return;
}
ep8248e_bcsr = of_iomap(ep8248e_bcsr_node, 0);
if (!ep8248e_bcsr) {
printk(KERN_ERR "Cannot map BCSR registers\n");
return;
}
setbits8(&ep8248e_bcsr[7], BCSR7_SCC2_ENABLE);
setbits8(&ep8248e_bcsr[8], BCSR8_PHY1_ENABLE | BCSR8_PHY1_POWER |
BCSR8_PHY2_ENABLE | BCSR8_PHY2_POWER);
init_ioports();
if (ppc_md.progress)
ppc_md.progress("ep8248_setup_arch(), finish", 0);
}
static struct of_device_id __initdata of_bus_ids[] = {
{ .name = "soc", },
{ .name = "cpm", },
{ .compatible = "fsl,pq2-chipselect", },
{ .compatible = "fsl,ep8248e-bcsr", },
{},
};
static int __init declare_of_platform_devices(void)
{
if (!machine_is(ep8248))
return 0;
of_platform_bus_probe(NULL, of_bus_ids, NULL);
of_register_platform_driver(&ep8248e_mdio_driver);
return 0;
}
device_initcall(declare_of_platform_devices);
/*
* Called very early, device-tree isn't unflattened
*/
static int __init ep8248_probe(void)
{
unsigned long root = of_get_flat_dt_root();
return of_flat_dt_is_compatible(root, "fsl,ep8248e");
}
define_machine(ep8248)
{
.name = "Embedded Planet EP8248E",
.probe = ep8248_probe,
.setup_arch = ep8248_setup_arch,
.init_IRQ = ep8248_pic_init,
.get_irq = cpm2_get_irq,
.calibrate_decr = generic_calibrate_decr,
.restart = pq2_restart,
.progress = udbg_progress,
};
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