diff options
| author | Anson Huang <b20788@freescale.com> | 2014-04-29 12:33:52 +0800 |
|---|---|---|
| committer | Huang Shijie <b32955@freescale.com> | 2014-06-18 12:58:19 +0800 |
| commit | 5ad668295aeee17b4bae21d8741252a843dce528 (patch) | |
| tree | 9a6fd1ceaf9c0a88ed5f138c3164c8ad93a23745 /drivers/tty | |
| parent | ff0e51f6fa07c7b43047700f110a004b873d668c (diff) | |
ENGR00318938-1 serial: imx: add UART save/restore during DSM enter/exit
When Mega/Fast mix is off, UART controller will lost power,
so need to add save/restore to make it work after resume.
Signed-off-by: Anson Huang <b20788@freescale.com>
Signed-off-by: Huang Shijie <b32955@freescale.com>
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/serial/imx.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index e2f93874989b..62c0cd5fe7c7 100644 --- a/drivers/tty/serial/imx.c +++ b/drivers/tty/serial/imx.c @@ -226,6 +226,7 @@ struct imx_port { unsigned int tx_bytes; unsigned int dma_tx_nents; wait_queue_head_t dma_wait; + unsigned int saved_reg[11]; }; struct imx_port_ucrs { @@ -1810,6 +1811,19 @@ static int serial_imx_suspend(struct platform_device *dev, pm_message_t state) uart_suspend_port(&imx_reg, &sport->port); + /* Save necessary regs */ + sport->saved_reg[0] = readl(sport->port.membase + UCR1); + sport->saved_reg[1] = readl(sport->port.membase + UCR2); + sport->saved_reg[2] = readl(sport->port.membase + UCR3); + sport->saved_reg[3] = readl(sport->port.membase + UCR4); + sport->saved_reg[4] = readl(sport->port.membase + UFCR); + sport->saved_reg[5] = readl(sport->port.membase + UESC); + sport->saved_reg[6] = readl(sport->port.membase + UTIM); + sport->saved_reg[7] = readl(sport->port.membase + UBIR); + sport->saved_reg[8] = readl(sport->port.membase + UBMR); + sport->saved_reg[9] = readl(sport->port.membase + UBRC); + sport->saved_reg[10] = readl(sport->port.membase + IMX21_UTS); + return 0; } @@ -1818,6 +1832,18 @@ static int serial_imx_resume(struct platform_device *dev) struct imx_port *sport = platform_get_drvdata(dev); unsigned int val; + writel(sport->saved_reg[4], sport->port.membase + UFCR); + writel(sport->saved_reg[5], sport->port.membase + UESC); + writel(sport->saved_reg[6], sport->port.membase + UTIM); + writel(sport->saved_reg[7], sport->port.membase + UBIR); + writel(sport->saved_reg[8], sport->port.membase + UBMR); + writel(sport->saved_reg[9], sport->port.membase + UBRC); + writel(sport->saved_reg[10], sport->port.membase + IMX21_UTS); + writel(sport->saved_reg[0], sport->port.membase + UCR1); + writel(sport->saved_reg[1] | 0x1, sport->port.membase + UCR2); + writel(sport->saved_reg[2], sport->port.membase + UCR3); + writel(sport->saved_reg[3], sport->port.membase + UCR4); + /* disable wakeup from i.MX UART */ val = readl(sport->port.membase + UCR3); val &= ~UCR3_AWAKEN; |