[RFC PATCH 18/19] powerpc: wii: platform support
Albert Herranz
albert_herranz at yahoo.es
Tue Nov 24 07:21:46 EST 2009
Grant Likely wrote:
> On Sun, Nov 22, 2009 at 3:01 PM, Albert Herranz <albert_herranz at yahoo.es> wrote:
>> Add platform support for the Nintendo Wii video game console.
>>
>> Signed-off-by: Albert Herranz <albert_herranz at yahoo.es>
>> ---
>> +static int wii_setup_hw_resets(void)
>> +{
>> + struct device_node *np;
>> + struct resource res;
>> + int error = -ENODEV;
>> +
>> + np = of_find_compatible_node(NULL, NULL, HW_RESETS_OF_COMPATIBLE);
>> + if (!np) {
>> + pr_err("no compatible node found for %s\n",
>> + HW_RESETS_OF_COMPATIBLE);
>> + goto out;
>> + }
>> + error = of_address_to_resource(np, 0, &res);
>> + if (error) {
>> + pr_err("no valid reg found for %s\n", np->name);
>> + goto out_put;
>> + }
>> +
>> + hw_resets = ioremap(res.start, res.end - res.start + 1);
>
> Or you could use of_iomap() to cut out some code.
>
Thanks. I'll have a look at it.
>> + if (hw_resets) {
>> + pr_info("hw_resets at 0x%08x mapped to 0x%p\n",
>> + res.start, hw_resets);
>> + }
>> +
>> +out_put:
>> + of_node_put(np);
>> +out:
>> + return error;
>> +}
>> +
>> +static int wii_setup_hw_gpio(void)
>> +{
>> + struct device_node *np;
>> + struct resource res;
>> + const char *path;
>> + int error = -ENODEV;
>> +
>> + np = of_find_node_by_name(NULL, "aliases");
>> + if (!np) {
>> + pr_err("unable to find node %s\n", "aliases");
>> + goto out;
>> + }
>> +
>> + path = of_get_property(np, HW_GPIO_ALIAS, NULL);
>> + of_node_put(np);
>> + if (!path) {
>> + pr_err("alias %s unknown\n", HW_GPIO_ALIAS);
>> + goto out;
>> + }
>> +
>> + np = of_find_node_by_path(path);
>> + if (!np) {
>> + pr_err("node for alias %s unknown\n", HW_GPIO_ALIAS);
>> + goto out;
>> + }
>> + error = of_address_to_resource(np, 0, &res);
>> + if (error) {
>> + pr_err("no valid reg found for %s\n", np->name);
>> + goto out_put;
>> + }
>> +
>> + hw_gpio = ioremap(res.start, res.end - res.start + 1);
>> + if (hw_gpio) {
>> + pr_info("hw_gpio at 0x%08x mapped to 0x%p\n",
>> + res.start, hw_gpio);
>> + }
>> +
>> +out_put:
>> + of_node_put(np);
>> +out:
>> + return error;
>> +}
>> +
>> +static void wii_setup(void)
>> +{
>> + wii_setup_hw_resets();
>> + wii_setup_hw_gpio();
>> +}
>> +
>> +static void wii_restart(char *cmd)
>> +{
>> + local_irq_disable();
>> +
>> + if (hw_resets) {
>> + /* clear the system reset pin to cause a reset */
>> + clear_bit(0, hw_resets);
>> + }
>> + wii_spin();
>> +}
>> +
>> +static void wii_power_off(void)
>> +{
>> + local_irq_disable();
>> +
>> + if (hw_gpio) {
>> + /* make sure that the poweroff GPIO is configured as output */
>> + out_be32(hw_gpio + HW_GPIO_DIR,
>> + in_be32(hw_gpio + HW_GPIO_DIR) | HW_GPIO_SHUTDOWN);
>> +
>> + /* drive the poweroff GPIO high */
>> + out_be32(hw_gpio + HW_GPIO_OUT,
>> + in_be32(hw_gpio + HW_GPIO_OUT) | HW_GPIO_SHUTDOWN);
>> + }
>> + wii_spin();
>> +}
>> +
>> +#else
>> +
>> +static void wii_setup(void)
>> +{
>> +}
>> +
>> +static void wii_restart(char *cmd)
>> +{
>> + wii_spin();
>> +}
>> +
>> +static void wii_power_off(void)
>> +{
>> + wii_spin();
>> +}
>> +
>> +#endif /* CONFIG_STARLET_MINI */
>> +
>> +static void wii_halt(void)
>> +{
>> + if (ppc_md.restart)
>> + ppc_md.restart(NULL);
>> + wii_spin();
>> +}
>> +
>> +static void wii_show_cpuinfo(struct seq_file *m)
>> +{
>> + seq_printf(m, "vendor\t\t: IBM\n");
>> + seq_printf(m, "machine\t\t: Nintendo Wii\n");
>> +}
>
> Drop show_cpuinfo() hook.
>
Yup.
>> +static int wii_discover_ipc_flavour(void)
>> +{
>> + struct mipc_infohdr *hdrp;
>> + int error;
>> +
>> + error = mipc_infohdr_get(&hdrp);
>> + if (!error) {
>> + mipc_infohdr_put(hdrp);
>> + starlet_ipc_flavour = STARLET_IPC_MINI;
>> + wii_setup();
>> + ppc_md.restart = wii_restart;
>> + ppc_md.power_off = wii_power_off;
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static void __init wii_setup_arch(void)
>> +{
>> + ug_udbg_init();
>> + wii_discover_ipc_flavour();
>> +}
>> +
>> +static void __init wii_init_early(void)
>> +{
>> +}
>> +
>> +static int __init wii_probe(void)
>> +{
>> + unsigned long dt_root;
>> +
>> + dt_root = of_get_flat_dt_root();
>> + if (!of_flat_dt_is_compatible(dt_root, "nintendo,wii"))
>> + return 0;
>> +
>> + return 1;
>> +}
>> +
>> +static void wii_shutdown(void)
>> +{
>> + flipper_quiesce();
>> +}
>> +
>> +#ifdef CONFIG_KEXEC
>> +static int wii_machine_kexec_prepare(struct kimage *image)
>> +{
>> + return 0;
>> +}
>> +
>> +static void wii_machine_kexec(struct kimage *image)
>> +{
>> + default_machine_kexec(image);
>> +}
>
> Drop unnecessary hooks. If no kexec hook it offered, then
> default_machine_kexec() gets called anyway.
>
Yes, at this stage I can get rid of those functions and add them later when they get actual code.
Thanks.
>> +#endif /* CONFIG_KEXEC */
>
>> +
>> +define_machine(wii) {
>> + .name = "wii",
>> + .probe = wii_probe,
>> + .setup_arch = wii_setup_arch,
>> + .init_early = wii_init_early,
>> + .show_cpuinfo = wii_show_cpuinfo,
>> + .halt = wii_halt,
>> + .init_IRQ = flipper_pic_probe,
>> + .get_irq = flipper_pic_get_irq,
>> + .calibrate_decr = generic_calibrate_decr,
>> + .progress = udbg_progress,
>> + .machine_shutdown = wii_shutdown,
>> +#ifdef CONFIG_KEXEC
>> + .machine_kexec_prepare = wii_machine_kexec_prepare,
>> + .machine_kexec = wii_machine_kexec,
>> +#endif
>> +};
>> +
>> diff --git a/arch/powerpc/platforms/embedded6xx/wii_dev.c b/arch/powerpc/platforms/embedded6xx/wii_dev.c
>> new file mode 100644
>> index 0000000..903063e
>> --- /dev/null
>> +++ b/arch/powerpc/platforms/embedded6xx/wii_dev.c
>> @@ -0,0 +1,47 @@
>> +/*
>> + * arch/powerpc/platforms/embedded6xx/wii_dev.c
>> + *
>> + * Nintendo Wii platform device setup.
>> + * Copyright (C) 2008-2009 The GameCube Linux Team
>> + * Copyright (C) 2008,2009 Albert Herranz
>> + *
>> + * This program is free software; you can redistribute it and/or
>> + * modify it under the terms of the GNU General Public License
>> + * as published by the Free Software Foundation; either version 2
>> + * of the License, or (at your option) any later version.
>> + *
>> + */
>> +
>> +#include <linux/kernel.h>
>> +#include <linux/init.h>
>> +#include <linux/of_platform.h>
>> +
>> +#include <asm/machdep.h>
>> +
>> +static struct of_device_id wii_of_bus[] = {
>> + { .compatible = "nintendo,hollywood", },
>> +#ifdef CONFIG_STARLET_MINI
>> + { .compatible = "twiizers,starlet-mini-ipc", },
>> +#endif
>> + { },
>> +};
>> +
>> +static int __init wii_device_probe(void)
>> +{
>> + struct device_node *np;
>> +
>> + if (!machine_is(wii))
>> + return 0;
>> +
>> + of_platform_bus_probe(NULL, wii_of_bus, NULL);
>> +
>> + np = of_find_compatible_node(NULL, NULL, "nintendo,hollywood-mem2");
>> + if (np) {
>> + of_platform_device_create(np, NULL, NULL);
>> + of_node_put(np);
>> + }
>> +
>> + return 0;
>> +}
>> +device_initcall(wii_device_probe);
>
> Why is this split into a separate file? (Same comment goes for the
> Gamecube version). Just roll all the platform support into a single
> file since there is no shared code.
>
I'll do that too. Thanks.
Cheers,
Albert
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