Re: [RFC PATCH v2 08/12] MIPS: Octeon: Initialize and fixup device tree.

[Grant Likely <grant.likely@secretlab.ca>]

On Fri, Mar 04, 2011 at 11:42:20AM -0800, David Daney wrote:
> Signed-off-by: David Daney <ddaney@caviumnetworks.com>
> ---
>  arch/mips/Kconfig                         |    1 +
>  arch/mips/cavium-octeon/octeon-platform.c |  234 +++++++++++++++++++++++++++++
>  arch/mips/cavium-octeon/setup.c           |   17 ++
>  3 files changed, 252 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
> index 4baf7f2..021be61 100644
> --- a/arch/mips/Kconfig
> +++ b/arch/mips/Kconfig
> @@ -1355,6 +1355,7 @@ config CPU_CAVIUM_OCTEON
>  	select CPU_SUPPORTS_HIGHMEM
>  	select CPU_SUPPORTS_HUGEPAGES
>  	select GENERIC_HARDIRQS_NO_DEPRECATED
> +	select LIBFDT
>  	help
>  	  The Cavium Octeon processor is a highly integrated chip containing
>  	  many ethernet hardware widgets for networking tasks. The processor
> diff --git a/arch/mips/cavium-octeon/octeon-platform.c b/arch/mips/cavium-octeon/octeon-platform.c
> index cecaf62..87512c5 100644
> --- a/arch/mips/cavium-octeon/octeon-platform.c
> +++ b/arch/mips/cavium-octeon/octeon-platform.c
> @@ -13,10 +13,16 @@
>  #include <linux/usb.h>
>  #include <linux/dma-mapping.h>
>  #include <linux/module.h>
> +#include <linux/slab.h>
>  #include <linux/platform_device.h>
> +#include <linux/of_platform.h>
> +#include <linux/of_fdt.h>
> +#include <linux/libfdt.h>
>  
>  #include <asm/octeon/octeon.h>
>  #include <asm/octeon/cvmx-rnm-defs.h>
> +#include <asm/octeon/cvmx-helper.h>
> +#include <asm/octeon/cvmx-helper-board.h>
>  
>  static struct octeon_cf_data octeon_cf_data;
>  
> @@ -440,6 +446,234 @@ device_initcall(octeon_ohci_device_init);
>  
>  #endif /* CONFIG_USB */
>  
> +static struct of_device_id __initdata octeon_ids[] = {
> +	{ .name = "soc@0", },

In general it is strongly discouraged to bind on name.  It causes all
kinds of problems.  Stick with simply binding on 'compatible'.

> +	{ .compatible = "simple-bus", },
> +	{},
> +};
> +
> +static void __init octeon_fdt_set_phy(int eth, int phy_addr)
> +{
> +	const __be32 *phy_handle;
> +	const __be32 *reg;
> +	struct fdt_node_header *raw_node;
> +	u32 phandle;
> +	int phy;
> +	char new_address[3];
> +	char *cp;
> +
> +	phy_handle = fdt_getprop(initial_boot_params, eth, "phy-handle", NULL);
> +	if (!phy_handle)
> +		return;
> +
> +	phandle = be32_to_cpup(phy_handle);
> +	phy = fdt_node_offset_by_phandle(initial_boot_params, phandle);
> +	if (phy_addr < 0 || phy < 0) {
> +		/* Delete the PHY things */
> +		if (phy >= 0)
> +			fdt_nop_node(initial_boot_params, phy);
> +		fdt_nop_property(initial_boot_params, eth, "phy-handle");
> +		return;
> +	}
> +
> +	reg = fdt_getprop(initial_boot_params, phy, "reg", NULL);
> +	if (phy_addr == be32_to_cpup(reg))
> +		return;
> +
> +	fdt_setprop_inplace_cell(initial_boot_params, phy, "reg", phy_addr);
> +
> +	snprintf(new_address, sizeof(new_address), "%x", phy_addr);
> +	/*
> +	 * All PHYs in the template have a name like 'ethernet-phy@0',
> +	 * that is 14 characters, which allows us to replace the
> +	 * address portion with up to two characters without
> +	 * clobbering things past a multiple of 4 boundry.
> +	 */

Yikes; that's just asking for trouble when someone changes the name in
the future without knowing about this code.  You must do bounds checking.

> +	raw_node = (void *)fdt_offset_ptr(initial_boot_params, phy, 0);
> +	cp = strchr(raw_node->name, '@');
> +	if (!cp)
> +		return;
> +	cp++;
> +	cp[0] = new_address[0];
> +	cp[1] = new_address[1];
> +
> +}
> +
> +static void __init octeon_fdt_set_mac_addr(int n, u64 *pmac)
> +{
> +	u8 new_mac[6];
> +	u64 mac = *pmac;
> +	int r;
> +
> +	new_mac[0] = (mac >> 40) & 0xff;
> +	new_mac[1] = (mac >> 32) & 0xff;
> +	new_mac[2] = (mac >> 24) & 0xff;
> +	new_mac[3] = (mac >> 16) & 0xff;
> +	new_mac[4] = (mac >> 8) & 0xff;
> +	new_mac[5] = mac & 0xff;
> +
> +	r = fdt_setprop_inplace(initial_boot_params, n, "local-mac-address",
> +				new_mac, sizeof(new_mac));
> +
> +	if (r) {
> +		pr_err("Setting \"local-mac-address\" failed %d", r);
> +		return;
> +	}
> +	*pmac = mac + 1;
> +}
> +
> +static void __init octeon_fdt_rm_ethernet(int node)
> +{
> +	const __be32 *phy_handle;
> +
> +	phy_handle = fdt_getprop(initial_boot_params, node, "phy-handle", NULL);
> +	if (phy_handle) {
> +		u32 ph = be32_to_cpup(phy_handle);
> +		int p = fdt_node_offset_by_phandle(initial_boot_params, ph);
> +		if (p >= 0)
> +			fdt_nop_node(initial_boot_params, p);
> +	}
> +	fdt_nop_node(initial_boot_params, node);
> +}
> +
> +static void __init octeon_fdt_pip_port(int iface, int i, int p, u64 *pmac)
> +{
> +	char name_buffer[20];
> +	int eth;
> +	int phy_addr;
> +
> +	snprintf(name_buffer, sizeof(name_buffer), "ethernet@%d", p);
> +	eth = fdt_subnode_offset(initial_boot_params, iface, name_buffer);
> +	if (eth < 0)
> +		return;
> +	if (p >= cvmx_helper_ports_on_interface(i)) {
> +		pr_notice("Deleting port %x:%x\n", i, p);
> +		octeon_fdt_rm_ethernet(eth);
> +		return;
> +	}
> +
> +	phy_addr = cvmx_helper_board_get_mii_address(16 * i + p);
> +	octeon_fdt_set_phy(eth, phy_addr);
> +	octeon_fdt_set_mac_addr(eth, pmac);
> +}
> +
> +static void __init octeon_fdt_pip_iface(int pip, int idx, u64 *pmac)
> +{
> +	char name_buffer[20];
> +	int iface;
> +	int p;
> +
> +	cvmx_helper_interface_enumerate(idx);
> +	snprintf(name_buffer, sizeof(name_buffer), "interface@%d", idx);
> +	iface = fdt_subnode_offset(initial_boot_params, pip, name_buffer);
> +	if (iface < 0)
> +		return;
> +
> +	for (p = 0; p < 4; p++)
> +		octeon_fdt_pip_port(iface, idx, p, pmac);
> +}
> +
> +int __init octeon_prune_device_tree(void)
> +{
> +	int i, max_port;
> +	const char *pip_path;
> +	char name_buffer[20];
> +	int aliases;
> +	u64 mac_addr_base;
> +
> +	if (fdt_check_header(initial_boot_params))
> +		panic("Corrupt Device Tree.");
> +
> +	aliases = fdt_path_offset(initial_boot_params, "/aliases");
> +	if (aliases < 0) {
> +		pr_err("Error: No /aliases node in device tree.");
> +		return -EINVAL;
> +	}
> +
> +
> +	mac_addr_base =
> +		((octeon_bootinfo->mac_addr_base[0] & 0xffull)) << 40 |
> +		((octeon_bootinfo->mac_addr_base[1] & 0xffull)) << 32 |
> +		((octeon_bootinfo->mac_addr_base[2] & 0xffull)) << 24 |
> +		((octeon_bootinfo->mac_addr_base[3] & 0xffull)) << 16 |
> +		((octeon_bootinfo->mac_addr_base[4] & 0xffull)) << 8 |
> +		(octeon_bootinfo->mac_addr_base[5] & 0xffull);
> +
> +	if (OCTEON_IS_MODEL(OCTEON_CN52XX) || OCTEON_IS_MODEL(OCTEON_CN63XX))
> +		max_port = 2;
> +	else if (OCTEON_IS_MODEL(OCTEON_CN56XX))
> +		max_port = 1;
> +	else
> +		max_port = 0;
> +
> +	for (i = 0; i < 2; i++) {
> +		const char *alias_prop;
> +		int mgmt;
> +		snprintf(name_buffer, sizeof(name_buffer),
> +			 "mix%d", i);
> +		alias_prop = fdt_getprop(initial_boot_params, aliases,
> +					name_buffer, NULL);
> +		if (alias_prop) {
> +			mgmt = fdt_path_offset(initial_boot_params, alias_prop);
> +			if (mgmt < 0)
> +				continue;
> +			if (i >= max_port) {
> +				pr_notice("Deleting mix%d\n", i);
> +				octeon_fdt_rm_ethernet(mgmt);
> +				fdt_nop_property(initial_boot_params, aliases,
> +						 name_buffer);
> +			} else {
> +				octeon_fdt_set_phy(mgmt, i);
> +				octeon_fdt_set_mac_addr(mgmt, &mac_addr_base);
> +			}
> +		}
> +	}
> +
> +	pip_path = fdt_getprop(initial_boot_params, aliases, "pip", NULL);
> +	if (pip_path) {
> +		int pip = fdt_path_offset(initial_boot_params, pip_path);
> +		if (pip  >= 0)
> +			for (i = 0; i < 4; i++)
> +				octeon_fdt_pip_iface(pip, i, &mac_addr_base);
> +	}
> +
> +	/* I2C */
> +	if (OCTEON_IS_MODEL(OCTEON_CN52XX) ||
> +	    OCTEON_IS_MODEL(OCTEON_CN63XX) ||
> +	    OCTEON_IS_MODEL(OCTEON_CN56XX))
> +		max_port = 2;
> +	else
> +		max_port = 1;
> +
> +	for (i = 0; i < 2; i++) {
> +		const char *alias_prop;
> +		int i2c;
> +		snprintf(name_buffer, sizeof(name_buffer),
> +			 "twsi%d", i);
> +		alias_prop = fdt_getprop(initial_boot_params, aliases,
> +					name_buffer, NULL);
> +
> +		if (alias_prop) {
> +			i2c = fdt_path_offset(initial_boot_params, alias_prop);
> +			if (i2c < 0)
> +				continue;
> +			if (i >= max_port) {
> +				pr_notice("Deleting i2c%d\n", i);
> +				fdt_nop_node(initial_boot_params, i2c);
> +			}
> +		}
> +	}
> +
> +	return 0;
> +}
> +
> +static int __init octeon_publish_devices(void)
> +{
> +	return of_platform_bus_probe(NULL, octeon_ids, NULL);
> +}
> +device_initcall(octeon_publish_devices);
> +
> +
>  MODULE_AUTHOR("David Daney <ddaney@caviumnetworks.com>");
>  MODULE_LICENSE("GPL");
>  MODULE_DESCRIPTION("Platform driver for Octeon SOC");
> diff --git a/arch/mips/cavium-octeon/setup.c b/arch/mips/cavium-octeon/setup.c
> index ab1a106..02765d6 100644
> --- a/arch/mips/cavium-octeon/setup.c
> +++ b/arch/mips/cavium-octeon/setup.c
> @@ -20,6 +20,7 @@
>  #include <linux/platform_device.h>
>  #include <linux/serial_core.h>
>  #include <linux/serial_8250.h>
> +#include <linux/of_fdt.h>
>  #ifdef CONFIG_BLK_DEV_INITRD
>  #include <linux/initrd.h>
>  #endif
> @@ -797,3 +798,19 @@ void prom_free_prom_memory(void)
>  	}
>  #endif
>  }
> +
> +int octeon_prune_device_tree(void);
> +
> +extern const char __dtb_octeon_3xxx_begin;
> +extern const char __dtb_octeon_3xxx_end;
> +void __init device_tree_init(void)
> +{
> +	int dt_size = &__dtb_octeon_3xxx_end - &__dtb_octeon_3xxx_begin;
> +	/* Copy the default tree from init memory. */
> +	initial_boot_params = early_init_dt_alloc_memory_arch(dt_size, 8);
> +	if (initial_boot_params == NULL)
> +		panic("Could not allocate initial_boot_params\n");
> +	memcpy(initial_boot_params, &__dtb_octeon_3xxx_begin, dt_size);
> +	octeon_prune_device_tree();
> +	unflatten_device_tree();
> +}
> -- 
> 1.7.2.3
>