182 lines
5.3 KiB
Diff
182 lines
5.3 KiB
Diff
2.6.26 backport of
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http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=a0087f2fcf5cb4e16502f5334168fbe304af318b
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[ARM] Orion: implement power-off method for Kurobox Pro
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Sylver Bruneau [Wed, 30 Apr 2008 06:14:58 +0000 (08:14 +0200)]
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This patch implements the communication with the microcontroller on the
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Kurobox Pro and Linkstation Pro/Live boards. This is allowing to send
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the commands needed to power-off the board correctly.
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Signed-off-by: Sylver Bruneau <sylver.bruneau@googlemail.com>
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Acked-by: Russell King <linux@arm.linux.org.uk>
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Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
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diff --git a/arch/arm/mach-orion5x/kurobox_pro-setup.c b/arch/arm/mach-orion5x/kurobox_pro-setup.c
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index f5074b8..7570c8b 100644
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--- a/arch/arm/mach-orion5x/kurobox_pro-setup.c
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+++ b/arch/arm/mach-orion5x/kurobox_pro-setup.c
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@@ -13,10 +13,12 @@
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#include <linux/platform_device.h>
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#include <linux/pci.h>
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#include <linux/irq.h>
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+#include <linux/delay.h>
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#include <linux/mtd/physmap.h>
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#include <linux/mtd/nand.h>
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#include <linux/mv643xx_eth.h>
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#include <linux/i2c.h>
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+#include <linux/serial_reg.h>
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#include <linux/ata_platform.h>
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#include <asm/mach-types.h>
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#include <asm/gpio.h>
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@@ -179,6 +181,140 @@ static struct mv_sata_platform_data kurobox_pro_sata_data = {
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};
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/*****************************************************************************
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+ * Kurobox Pro specific power off method via UART1-attached microcontroller
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+ ****************************************************************************/
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+
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+#define UART1_REG(x) (UART1_VIRT_BASE + ((UART_##x) << 2))
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+
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+static int kurobox_pro_miconread(unsigned char *buf, int count)
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+{
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+ int i;
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+ int timeout;
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+
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+ for (i = 0; i < count; i++) {
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+ timeout = 10;
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+
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+ while (!(readl(UART1_REG(LSR)) & UART_LSR_DR)) {
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+ if (--timeout == 0)
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+ break;
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+ udelay(1000);
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+ }
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+
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+ if (timeout == 0)
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+ break;
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+ buf[i] = readl(UART1_REG(RX));
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+ }
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+
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+ /* return read bytes */
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+ return i;
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+}
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+
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+static int kurobox_pro_miconwrite(const unsigned char *buf, int count)
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+{
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+ int i = 0;
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+
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+ while (count--) {
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+ while (!(readl(UART1_REG(LSR)) & UART_LSR_THRE))
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+ barrier();
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+ writel(buf[i++], UART1_REG(TX));
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+ }
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+
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+ return 0;
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+}
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+
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+static int kurobox_pro_miconsend(const unsigned char *data, int count)
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+{
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+ int i;
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+ unsigned char checksum = 0;
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+ unsigned char recv_buf[40];
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+ unsigned char send_buf[40];
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+ unsigned char correct_ack[3];
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+ int retry = 2;
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+
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+ /* Generate checksum */
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+ for (i = 0; i < count; i++)
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+ checksum -= data[i];
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+
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+ do {
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+ /* Send data */
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+ kurobox_pro_miconwrite(data, count);
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+
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+ /* send checksum */
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+ kurobox_pro_miconwrite(&checksum, 1);
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+
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+ if (kurobox_pro_miconread(recv_buf, sizeof(recv_buf)) <= 3) {
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+ printk(KERN_ERR ">%s: receive failed.\n", __func__);
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+
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+ /* send preamble to clear the receive buffer */
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+ memset(&send_buf, 0xff, sizeof(send_buf));
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+ kurobox_pro_miconwrite(send_buf, sizeof(send_buf));
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+
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+ /* make dummy reads */
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+ mdelay(100);
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+ kurobox_pro_miconread(recv_buf, sizeof(recv_buf));
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+ } else {
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+ /* Generate expected ack */
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+ correct_ack[0] = 0x01;
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+ correct_ack[1] = data[1];
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+ correct_ack[2] = 0x00;
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+
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+ /* checksum Check */
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+ if ((recv_buf[0] + recv_buf[1] + recv_buf[2] +
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+ recv_buf[3]) & 0xFF) {
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+ printk(KERN_ERR ">%s: Checksum Error : "
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+ "Received data[%02x, %02x, %02x, %02x]"
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+ "\n", __func__, recv_buf[0],
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+ recv_buf[1], recv_buf[2], recv_buf[3]);
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+ } else {
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+ /* Check Received Data */
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+ if (correct_ack[0] == recv_buf[0] &&
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+ correct_ack[1] == recv_buf[1] &&
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+ correct_ack[2] == recv_buf[2]) {
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+ /* Interval for next command */
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+ mdelay(10);
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+
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+ /* Receive ACK */
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+ return 0;
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+ }
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+ }
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+ /* Received NAK or illegal Data */
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+ printk(KERN_ERR ">%s: Error : NAK or Illegal Data "
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+ "Received\n", __func__);
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+ }
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+ } while (retry--);
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+
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+ /* Interval for next command */
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+ mdelay(10);
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+
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+ return -1;
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+}
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+
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+static void kurobox_pro_power_off(void)
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+{
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+ const unsigned char watchdogkill[] = {0x01, 0x35, 0x00};
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+ const unsigned char shutdownwait[] = {0x00, 0x0c};
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+ const unsigned char poweroff[] = {0x00, 0x06};
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+ /* 38400 baud divisor */
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+ const unsigned divisor = ((ORION5X_TCLK + (8 * 38400)) / (16 * 38400));
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+
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+ pr_info("%s: triggering power-off...\n", __func__);
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+
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+ /* hijack uart1 and reset into sane state (38400,8n1,even parity) */
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+ writel(0x83, UART1_REG(LCR));
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+ writel(divisor & 0xff, UART1_REG(DLL));
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+ writel((divisor >> 8) & 0xff, UART1_REG(DLM));
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+ writel(0x1b, UART1_REG(LCR));
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+ writel(0x00, UART1_REG(IER));
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+ writel(0x07, UART1_REG(FCR));
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+ writel(0x00, UART1_REG(MCR));
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+
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+ /* Send the commands to shutdown the Kurobox Pro */
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+ kurobox_pro_miconsend(watchdogkill, sizeof(watchdogkill)) ;
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+ kurobox_pro_miconsend(shutdownwait, sizeof(shutdownwait)) ;
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+ kurobox_pro_miconsend(poweroff, sizeof(poweroff));
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+}
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+
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+/*****************************************************************************
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* General Setup
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****************************************************************************/
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@@ -229,6 +365,9 @@ static void __init kurobox_pro_init(void)
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i2c_register_board_info(0, &kurobox_pro_i2c_rtc, 1);
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orion5x_eth_init(&kurobox_pro_eth_data);
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orion5x_sata_init(&kurobox_pro_sata_data);
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+
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+ /* register Kurobox Pro specific power-off method */
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+ pm_power_off = kurobox_pro_power_off;
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}
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#ifdef CONFIG_MACH_KUROBOX_PRO
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