diff options
Diffstat (limited to 'drivers/serial/amba-pl011.c')
| -rw-r--r-- | drivers/serial/amba-pl011.c | 74 |
1 files changed, 62 insertions, 12 deletions
diff --git a/drivers/serial/amba-pl011.c b/drivers/serial/amba-pl011.c index f8c55c4b54..b62dc9ff3c 100644 --- a/drivers/serial/amba-pl011.c +++ b/drivers/serial/amba-pl011.c @@ -35,6 +35,7 @@ #include <linux/amba/serial.h> #include <linux/clk.h> #include <linux/err.h> +#include <linux/amba/bus.h> /* * We wrap our port structure around the generic console_device. @@ -44,6 +45,23 @@ struct amba_uart_port { struct console_device uart; /* uart */ struct clk *clk; /* uart clock */ u32 uartclk; + struct vendor_data *vendor; +}; + +/* There is by now at least one vendor with differing details, so handle it */ +struct vendor_data { + unsigned int lcrh_tx; + unsigned int lcrh_rx; +}; + +static struct vendor_data vendor_arm = { + .lcrh_tx = UART011_LCRH, + .lcrh_rx = UART011_LCRH, +}; + +static struct vendor_data vendor_st = { + .lcrh_tx = ST_UART011_LCRH_TX, + .lcrh_rx = ST_UART011_LCRH_RX, }; static inline struct amba_uart_port * @@ -116,13 +134,27 @@ static int pl011_tstc(struct console_device *cdev) return !(readl(uart->base + UART01x_FR) & UART01x_FR_RXFE); } +static void pl011_rlcr(struct amba_uart_port *uart, u32 lcr) +{ + struct vendor_data *vendor = uart->vendor; + + writew(lcr, uart->base + vendor->lcrh_rx); + if (vendor->lcrh_tx != vendor->lcrh_rx) { + int i; + /* + * Wait 10 PCLKs before writing LCRH_TX register, + * to get this delay write read only register 10 times + */ + for (i = 0; i < 10; ++i) + writew(0xff, uart->base + UART011_MIS); + writew(lcr, uart->base + vendor->lcrh_tx); + } +} + int pl011_init_port (struct console_device *cdev) { - struct device_d *dev = cdev->dev; struct amba_uart_port *uart = to_amba_uart_port(cdev); - uart->base = dev_request_mem_region(dev, 0); - /* ** First, disable everything. */ @@ -142,8 +174,7 @@ int pl011_init_port (struct console_device *cdev) /* ** Set the UART to be 8 bits, 1 stop bit, no parity, fifo enabled. */ - writel((UART01x_LCRH_WLEN_8 | UART01x_LCRH_FEN), - uart->base + UART011_LCRH); + pl011_rlcr(uart, UART01x_LCRH_WLEN_8 | UART01x_LCRH_FEN); /* ** Finally, enable the UART @@ -154,19 +185,21 @@ int pl011_init_port (struct console_device *cdev) return 0; } -static int pl011_probe(struct device_d *dev) +static int pl011_probe(struct amba_device *dev, const struct amba_id *id) { struct amba_uart_port *uart; struct console_device *cdev; uart = xzalloc(sizeof(struct amba_uart_port)); - uart->clk = clk_get(dev, NULL); + uart->clk = clk_get(&dev->dev, NULL); + uart->base = amba_get_mem_region(dev); + uart->vendor = (void*)id->data; if (IS_ERR(uart->clk)) return PTR_ERR(uart->clk); cdev = &uart->uart; - cdev->dev = dev; + cdev->dev = &dev->dev; cdev->f_caps = CONSOLE_STDIN | CONSOLE_STDOUT | CONSOLE_STDERR; cdev->tstc = pl011_tstc; cdev->putc = pl011_putc; @@ -182,14 +215,31 @@ static int pl011_probe(struct device_d *dev) return 0; } -static struct driver_d pl011_driver = { - .name = "uart-pl011", - .probe = pl011_probe, +static struct amba_id pl011_ids[] = { + { + .id = 0x00041011, + .mask = 0x000fffff, + .data = &vendor_arm, + }, + { + .id = 0x00380802, + .mask = 0x00ffffff, + .data = &vendor_st, + }, + { 0, 0 }, +}; + +struct amba_driver pl011_driver = { + .drv = { + .name = "uart-pl011", + }, + .probe = pl011_probe, + .id_table = pl011_ids, }; static int pl011_init(void) { - register_driver(&pl011_driver); + amba_driver_register(&pl011_driver); return 0; } |