[ARM] Orion: implement power-off method for Kurobox Pro
This patch implements the communication with the microcontroller on the Kurobox Pro and Linkstation Pro/Live boards. This is allowing to send the commands needed to power-off the board correctly. Signed-off-by: Sylver Bruneau <sylver.bruneau@googlemail.com> Acked-by: Russell King <linux@arm.linux.org.uk> Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
This commit is contained in:
Sylver Bruneau
Lennert Buytenhek
parent
2850a03773
commit
a0087f2fcf
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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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@ -174,6 +176,140 @@ static struct mv_sata_platform_data kurobox_pro_sata_data = {
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.n_ports = 2,
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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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#define UART1_REG(x) (UART1_VIRT_BASE + ((UART_##x) << 2))
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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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for (i = 0; i < count; i++) {
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timeout = 10;
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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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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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/* return read bytes */
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return i;
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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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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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return 0;
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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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/* Generate checksum */
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for (i = 0; i < count; i++)
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checksum -= data[i];
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do {
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/* Send data */
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kurobox_pro_miconwrite(data, count);
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/* send checksum */
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kurobox_pro_miconwrite(&checksum, 1);
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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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/* 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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/* 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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/* 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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/* 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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/* Interval for next command */
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mdelay(10);
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return -1;
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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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pr_info("%s: triggering power-off...\n", __func__);
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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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/* 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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* General Setup
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****************************************************************************/
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@ -194,10 +330,10 @@ static struct orion5x_mpp_mode kurobox_pro_mpp_modes[] __initdata = {
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{ 13, MPP_SATA_LED }, /* SATA 1 presence */
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{ 14, MPP_SATA_LED }, /* SATA 0 active */
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{ 15, MPP_SATA_LED }, /* SATA 1 active */
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{ 16, MPP_UNUSED },
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{ 17, MPP_UNUSED },
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{ 18, MPP_UNUSED },
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{ 19, MPP_UNUSED },
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{ 16, MPP_UART }, /* UART1 RXD */
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{ 17, MPP_UART }, /* UART1 TXD */
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{ 18, MPP_UART }, /* UART1 CTSn */
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{ 19, MPP_UART }, /* UART1 RTSn */
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{ -1 },
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};
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@ -231,6 +367,9 @@ static void __init kurobox_pro_init(void)
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}
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i2c_register_board_info(0, &kurobox_pro_i2c_rtc, 1);
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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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