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authorAndrew Lunn <andrew@lunn.ch>2014-02-20 06:02:35 +1000
committerJason Cooper <jason@lakedaemon.net>2014-03-04 03:48:41 +0000
commit200c0a3e404beab02be83e5cbf111d26b9f6ce22 (patch)
tree4cfcb9d5f37a1ea3435c8d33ad4271572a8f8b07 /drivers/power
parentff1f0018cf66080d8e6f59791e552615648a033a (diff)
downloadlinux-200c0a3e404beab02be83e5cbf111d26b9f6ce22.tar.bz2
Power: Reset: Generalize qnap-poweroff to work on Synology devices.
The Synology NAS devices use a very similar mechanism to QNAP NAS devices to power off. Both send a single charactor command to a PIC, over the second serial port. However the baud rate and the command differ. Generalize the driver to support this. Signed-off-by: Ben Peddell <klightspeed@killerwolves.net> Signed-off-by: Andrew Lunn <andrew@lunn.ch> Acked-by: Jason Cooper <jason@lakedaemon.net> Cc: Anton Vorontsov <anton@enomsg.org> Cc: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com> Cc: David Woodhouse <dwmw2@infradead.org> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
Diffstat (limited to 'drivers/power')
-rw-r--r--drivers/power/reset/qnap-poweroff.c49
1 files changed, 37 insertions, 12 deletions
diff --git a/drivers/power/reset/qnap-poweroff.c b/drivers/power/reset/qnap-poweroff.c
index 37f56f7ee926..a75db7f8a92f 100644
--- a/drivers/power/reset/qnap-poweroff.c
+++ b/drivers/power/reset/qnap-poweroff.c
@@ -1,5 +1,5 @@
/*
- * QNAP Turbo NAS Board power off
+ * QNAP Turbo NAS Board power off. Can also be used on Synology devices.
*
* Copyright (C) 2012 Andrew Lunn <andrew@lunn.ch>
*
@@ -25,17 +25,43 @@
#define UART1_REG(x) (base + ((UART_##x) << 2))
+struct power_off_cfg {
+ u32 baud;
+ char cmd;
+};
+
+static const struct power_off_cfg qnap_power_off_cfg = {
+ .baud = 19200,
+ .cmd = 'A',
+};
+
+static const struct power_off_cfg synology_power_off_cfg = {
+ .baud = 9600,
+ .cmd = '1',
+};
+
+static const struct of_device_id qnap_power_off_of_match_table[] = {
+ { .compatible = "qnap,power-off",
+ .data = &qnap_power_off_cfg,
+ },
+ { .compatible = "synology,power-off",
+ .data = &synology_power_off_cfg,
+ },
+ {}
+};
+MODULE_DEVICE_TABLE(of, qnap_power_off_of_match_table);
+
static void __iomem *base;
static unsigned long tclk;
+static const struct power_off_cfg *cfg;
static void qnap_power_off(void)
{
- /* 19200 baud divisor */
- const unsigned divisor = ((tclk + (8 * 19200)) / (16 * 19200));
+ const unsigned divisor = ((tclk + (8 * cfg->baud)) / (16 * cfg->baud));
pr_err("%s: triggering power-off...\n", __func__);
- /* hijack UART1 and reset into sane state (19200,8n1) */
+ /* hijack UART1 and reset into sane state */
writel(0x83, UART1_REG(LCR));
writel(divisor & 0xff, UART1_REG(DLL));
writel((divisor >> 8) & 0xff, UART1_REG(DLM));
@@ -44,16 +70,21 @@ static void qnap_power_off(void)
writel(0x00, UART1_REG(FCR));
writel(0x00, UART1_REG(MCR));
- /* send the power-off command 'A' to PIC */
- writel('A', UART1_REG(TX));
+ /* send the power-off command to PIC */
+ writel(cfg->cmd, UART1_REG(TX));
}
static int qnap_power_off_probe(struct platform_device *pdev)
{
+ struct device_node *np = pdev->dev.of_node;
struct resource *res;
struct clk *clk;
char symname[KSYM_NAME_LEN];
+ const struct of_device_id *match =
+ of_match_node(qnap_power_off_of_match_table, np);
+ cfg = match->data;
+
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(&pdev->dev, "Missing resource");
@@ -94,12 +125,6 @@ static int qnap_power_off_remove(struct platform_device *pdev)
return 0;
}
-static const struct of_device_id qnap_power_off_of_match_table[] = {
- { .compatible = "qnap,power-off", },
- {}
-};
-MODULE_DEVICE_TABLE(of, qnap_power_off_of_match_table);
-
static struct platform_driver qnap_power_off_driver = {
.probe = qnap_power_off_probe,
.remove = qnap_power_off_remove,