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linux-next/arch/arm/mach-orion5x/rd88f5181l-ge-setup.c
Lennert Buytenhek e84665c9cb dsa: add switch chip cascading support 
The initial version of the DSA driver only supported a single switch
chip per network interface, while DSA-capable switch chips can be
interconnected to form a tree of switch chips.  This patch adds support
for multiple switch chips on a network interface.

An example topology for a 16-port device with an embedded CPU is as
follows:

	+-----+          +--------+       +--------+
	|     |eth0    10| switch |9    10| switch |
	| CPU +----------+        +-------+        |
	|     |          | chip 0 |       | chip 1 |
	+-----+          +---++---+       +---++---+
	                     ||               ||
	                     ||               ||
	                     ||1000baseT      ||1000baseT
	                     ||ports 1-8      ||ports 9-16

This requires a couple of interdependent changes in the DSA layer:

- The dsa platform driver data needs to be extended: there is still
  only one netdevice per DSA driver instance (eth0 in the example
  above), but each of the switch chips in the tree needs its own
  mii_bus device pointer, MII management bus address, and port name
  array. (include/net/dsa.h)  The existing in-tree dsa users need
  some small changes to deal with this. (arch/arm)

- The DSA and Ethertype DSA tagging modules need to be extended to
  use the DSA device ID field on receive and demultiplex the packet
  accordingly, and fill in the DSA device ID field on transmit
  according to which switch chip the packet is heading to.
  (net/dsa/tag_{dsa,edsa}.c)

- The concept of "CPU port", which is the switch chip port that the
  CPU is connected to (port 10 on switch chip 0 in the example), needs
  to be extended with the concept of "upstream port", which is the
  port on the switch chip that will bring us one hop closer to the CPU
  (port 10 for both switch chips in the example above).

- The dsa platform data needs to specify which ports on which switch
  chips are links to other switch chips, so that we can enable DSA
  tagging mode on them.  (For inter-switch links, we always use
  non-EtherType DSA tagging, since it has lower overhead.  The CPU
  link uses dsa or edsa tagging depending on what the 'root' switch
  chip supports.)  This is done by specifying "dsa" for the given
  port in the port array.

- The dsa platform data needs to be extended with information on via
  which port to reach any given switch chip from any given switch chip.
  This info is specified via the per-switch chip data struct ->rtable[]
  array, which gives the nexthop ports for each of the other switches
  in the tree.

For the example topology above, the dsa platform data would look
something like this:

	static struct dsa_chip_data sw[2] = {
		{
			.mii_bus	= &foo,
			.sw_addr	= 1,
			.port_names[0]	= "p1",
			.port_names[1]	= "p2",
			.port_names[2]	= "p3",
			.port_names[3]	= "p4",
			.port_names[4]	= "p5",
			.port_names[5]	= "p6",
			.port_names[6]	= "p7",
			.port_names[7]	= "p8",
			.port_names[9]	= "dsa",
			.port_names[10]	= "cpu",
			.rtable		= (s8 []){ -1, 9, },
		}, {
			.mii_bus	= &foo,
			.sw_addr	= 2,
			.port_names[0]	= "p9",
			.port_names[1]	= "p10",
			.port_names[2]	= "p11",
			.port_names[3]	= "p12",
			.port_names[4]	= "p13",
			.port_names[5]	= "p14",
			.port_names[6]	= "p15",
			.port_names[7]	= "p16",
			.port_names[10]	= "dsa",
			.rtable		= (s8 []){ 10, -1, },
		},
	},

	static struct dsa_platform_data pd = {
		.netdev		= &foo,
		.nr_switches	= 2,
		.sw		= sw,
	};

Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
Tested-by: Gary Thomas <gary@mlbassoc.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-03-21 19:06:54 -07:00

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/*
* arch/arm/mach-orion5x/rd88f5181l-ge-setup.c
*
* Marvell Orion-VoIP GE Reference Design Setup
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/pci.h>
#include <linux/irq.h>
#include <linux/mtd/physmap.h>
#include <linux/mv643xx_eth.h>
#include <linux/ethtool.h>
#include <linux/i2c.h>
#include <net/dsa.h>
#include <asm/mach-types.h>
#include <asm/gpio.h>
#include <asm/leds.h>
#include <asm/mach/arch.h>
#include <asm/mach/pci.h>
#include <mach/orion5x.h>
#include "common.h"
#include "mpp.h"
/*****************************************************************************
* RD-88F5181L GE Info
****************************************************************************/
/*
* 16M NOR flash Device bus boot chip select
*/
#define RD88F5181L_GE_NOR_BOOT_BASE 0xff000000
#define RD88F5181L_GE_NOR_BOOT_SIZE SZ_16M
/*****************************************************************************
* 16M NOR Flash on Device bus Boot chip select
****************************************************************************/
static struct physmap_flash_data rd88f5181l_ge_nor_boot_flash_data = {
.width = 1,
};
static struct resource rd88f5181l_ge_nor_boot_flash_resource = {
.flags = IORESOURCE_MEM,
.start = RD88F5181L_GE_NOR_BOOT_BASE,
.end = RD88F5181L_GE_NOR_BOOT_BASE +
RD88F5181L_GE_NOR_BOOT_SIZE - 1,
};
static struct platform_device rd88f5181l_ge_nor_boot_flash = {
.name = "physmap-flash",
.id = 0,
.dev = {
.platform_data = &rd88f5181l_ge_nor_boot_flash_data,
},
.num_resources = 1,
.resource = &rd88f5181l_ge_nor_boot_flash_resource,
};
/*****************************************************************************
* General Setup
****************************************************************************/
static struct orion5x_mpp_mode rd88f5181l_ge_mpp_modes[] __initdata = {
{ 0, MPP_GPIO }, /* LED1 */
{ 1, MPP_GPIO }, /* LED5 */
{ 2, MPP_GPIO }, /* LED4 */
{ 3, MPP_GPIO }, /* LED3 */
{ 4, MPP_GPIO }, /* PCI_intA */
{ 5, MPP_GPIO }, /* RTC interrupt */
{ 6, MPP_PCI_CLK }, /* CPU PCI refclk */
{ 7, MPP_PCI_CLK }, /* PCI/PCIe refclk */
{ 8, MPP_GPIO }, /* 88e6131 interrupt */
{ 9, MPP_GPIO }, /* GE_RXERR */
{ 10, MPP_GPIO }, /* PCI_intB */
{ 11, MPP_GPIO }, /* LED2 */
{ 12, MPP_GIGE }, /* GE_TXD[4] */
{ 13, MPP_GIGE }, /* GE_TXD[5] */
{ 14, MPP_GIGE }, /* GE_TXD[6] */
{ 15, MPP_GIGE }, /* GE_TXD[7] */
{ 16, MPP_GIGE }, /* GE_RXD[4] */
{ 17, MPP_GIGE }, /* GE_RXD[5] */
{ 18, MPP_GIGE }, /* GE_RXD[6] */
{ 19, MPP_GIGE }, /* GE_RXD[7] */
{ -1 },
};
static struct mv643xx_eth_platform_data rd88f5181l_ge_eth_data = {
.phy_addr = MV643XX_ETH_PHY_NONE,
.speed = SPEED_1000,
.duplex = DUPLEX_FULL,
};
static struct dsa_chip_data rd88f5181l_ge_switch_chip_data = {
.port_names[0] = "lan2",
.port_names[1] = "lan1",
.port_names[2] = "wan",
.port_names[3] = "cpu",
.port_names[5] = "lan4",
.port_names[7] = "lan3",
};
static struct dsa_platform_data rd88f5181l_ge_switch_plat_data = {
.nr_chips = 1,
.chip = &rd88f5181l_ge_switch_chip_data,
};
static struct i2c_board_info __initdata rd88f5181l_ge_i2c_rtc = {
I2C_BOARD_INFO("ds1338", 0x68),
};
static void __init rd88f5181l_ge_init(void)
{
/*
* Setup basic Orion functions. Need to be called early.
*/
orion5x_init();
orion5x_mpp_conf(rd88f5181l_ge_mpp_modes);
/*
* Configure peripherals.
*/
orion5x_ehci0_init();
orion5x_eth_init(&rd88f5181l_ge_eth_data);
orion5x_eth_switch_init(&rd88f5181l_ge_switch_plat_data,
gpio_to_irq(8));
orion5x_i2c_init();
orion5x_uart0_init();
orion5x_setup_dev_boot_win(RD88F5181L_GE_NOR_BOOT_BASE,
RD88F5181L_GE_NOR_BOOT_SIZE);
platform_device_register(&rd88f5181l_ge_nor_boot_flash);
i2c_register_board_info(0, &rd88f5181l_ge_i2c_rtc, 1);
}
static int __init
rd88f5181l_ge_pci_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
{
int irq;
/*
* Check for devices with hard-wired IRQs.
*/
irq = orion5x_pci_map_irq(dev, slot, pin);
if (irq != -1)
return irq;
/*
* Cardbus slot.
*/
if (pin == 1)
return gpio_to_irq(4);
else
return gpio_to_irq(10);
}
static struct hw_pci rd88f5181l_ge_pci __initdata = {
.nr_controllers = 2,
.swizzle = pci_std_swizzle,
.setup = orion5x_pci_sys_setup,
.scan = orion5x_pci_sys_scan_bus,
.map_irq = rd88f5181l_ge_pci_map_irq,
};
static int __init rd88f5181l_ge_pci_init(void)
{
if (machine_is_rd88f5181l_ge()) {
orion5x_pci_set_cardbus_mode();
pci_common_init(&rd88f5181l_ge_pci);
}
return 0;
}
subsys_initcall(rd88f5181l_ge_pci_init);
MACHINE_START(RD88F5181L_GE, "Marvell Orion-VoIP GE Reference Design")
/* Maintainer: Lennert Buytenhek <buytenh@marvell.com> */
.phys_io = ORION5X_REGS_PHYS_BASE,
.io_pg_offst = ((ORION5X_REGS_VIRT_BASE) >> 18) & 0xFFFC,
.boot_params = 0x00000100,
.init_machine = rd88f5181l_ge_init,
.map_io = orion5x_map_io,
.init_irq = orion5x_init_irq,
.timer = &orion5x_timer,
.fixup = tag_fixup_mem32,
MACHINE_END
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