cc35b67668
This patch add the Chroma platform to WSP/PowerEN, which is a PCIe card (a defconfig is included). The card includes an H8 service processor that is used to manage the card. The H8 is connected over the second serial UART on the PowerEN chip so this patch includes a simple 16550 driver to enable communication, mostly for "power off" and "rebooting". This patch also includes a, WSP specific, "halt" method that will shut of all A2 cores but still leave power on at the chip level. This is desirable, especially if you wish to interrogate the chip with a hardware probe after the halt. Signed-off-by: Jimi Xenidis <jimix@pobox.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
134 lines
2.6 KiB
C
134 lines
2.6 KiB
C
/*
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* Copyright 2008-2011, IBM Corporation
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/of.h>
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#include <linux/io.h>
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#include "wsp.h"
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/*
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* The UART connection to the H8 is over ttyS1 which is just a 16550.
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* We assume that FW has it setup right and no one messes with it.
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*/
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static u8 __iomem *h8;
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#define RBR 0 /* Receiver Buffer Register */
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#define THR 0 /* Transmitter Holding Register */
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#define LSR 5 /* Line Status Register */
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#define LSR_DR 0x01 /* LSR value for Data-Ready */
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#define LSR_THRE 0x20 /* LSR value for Transmitter-Holding-Register-Empty */
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static void wsp_h8_putc(int c)
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{
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u8 lsr;
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do {
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lsr = readb(h8 + LSR);
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} while ((lsr & LSR_THRE) != LSR_THRE);
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writeb(c, h8 + THR);
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}
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static int wsp_h8_getc(void)
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{
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u8 lsr;
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do {
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lsr = readb(h8 + LSR);
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} while ((lsr & LSR_DR) != LSR_DR);
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return readb(h8 + RBR);
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}
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static void wsp_h8_puts(const char *s, int sz)
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{
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int i;
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for (i = 0; i < sz; i++) {
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wsp_h8_putc(s[i]);
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/* no flow control so wait for echo */
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wsp_h8_getc();
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}
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wsp_h8_putc('\r');
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wsp_h8_putc('\n');
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}
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static void wsp_h8_terminal_cmd(const char *cmd, int sz)
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{
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hard_irq_disable();
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wsp_h8_puts(cmd, sz);
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/* should never return, but just in case */
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for (;;)
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continue;
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}
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void wsp_h8_restart(char *cmd)
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{
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static const char restart[] = "warm-reset";
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(void)cmd;
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wsp_h8_terminal_cmd(restart, sizeof(restart) - 1);
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}
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void wsp_h8_power_off(void)
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{
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static const char off[] = "power-off";
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wsp_h8_terminal_cmd(off, sizeof(off) - 1);
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}
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static void __iomem *wsp_h8_getaddr(void)
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{
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struct device_node *aliases;
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struct device_node *uart;
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struct property *path;
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void __iomem *va = NULL;
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/*
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* there is nothing in the devtree to tell us which is mapped
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* to the H8, but se know it is the second serial port.
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*/
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aliases = of_find_node_by_path("/aliases");
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if (aliases == NULL)
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return NULL;
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path = of_find_property(aliases, "serial1", NULL);
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if (path == NULL)
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goto out;
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uart = of_find_node_by_path(path->value);
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if (uart == NULL)
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goto out;
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va = of_iomap(uart, 0);
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/* remove it so no one messes with it */
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of_detach_node(uart);
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of_node_put(uart);
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out:
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of_node_put(aliases);
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return va;
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}
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void __init wsp_setup_h8(void)
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{
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h8 = wsp_h8_getaddr();
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/* Devtree change? lets hard map it anyway */
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if (h8 == NULL) {
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pr_warn("UART to H8 could not be found");
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h8 = ioremap(0xffc0008000ULL, 0x100);
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}
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}
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