From c439c33d85e252d3b2b454ab7ba38b62d6e0a830 Mon Sep 17 00:00:00 2001 From: Loic Poulain Date: Thu, 24 Apr 2014 11:46:14 +0200 Subject: [PATCH] 8250_dw: Support all baudrates on baytrail In the same manner as 8250_pci, 8250_dw needs some baytrail specific quirks to be used. The reference clock needs to be adjusted before divided in order to have the minimum error rate on the baudrate. The specific byt set termios function is stored in the driver_data field of the acpi device id via the dw8250_acpi_desc structure. Remove the uartclk field which is no longer delivered as driver data. Signed-off-by: Loic Poulain Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/8250/8250_dw.c | 81 +++++++++++++++++++++++++++++-- 1 file changed, 77 insertions(+), 4 deletions(-) diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c index ed3113576740..51b307aab75e 100644 --- a/drivers/tty/serial/8250/8250_dw.c +++ b/drivers/tty/serial/8250/8250_dw.c @@ -62,6 +62,70 @@ struct dw8250_data { struct uart_8250_dma dma; }; +struct dw8250_acpi_desc { + void (*set_termios)(struct uart_port *p, struct ktermios *termios, + struct ktermios *old); +}; + +#define BYT_PRV_CLK 0x800 +#define BYT_PRV_CLK_EN (1 << 0) +#define BYT_PRV_CLK_M_VAL_SHIFT 1 +#define BYT_PRV_CLK_N_VAL_SHIFT 16 +#define BYT_PRV_CLK_UPDATE (1 << 31) + +static void byt_set_termios(struct uart_port *p, struct ktermios *termios, + struct ktermios *old) +{ + unsigned int baud = tty_termios_baud_rate(termios); + unsigned int m, n; + u32 reg; + + /* + * For baud rates 0.5M, 1M, 1.5M, 2M, 2.5M, 3M, 3.5M and 4M the + * dividers must be adjusted. + * + * uartclk = (m / n) * 100 MHz, where m <= n + */ + switch (baud) { + case 500000: + case 1000000: + case 2000000: + case 4000000: + m = 64; + n = 100; + p->uartclk = 64000000; + break; + case 3500000: + m = 56; + n = 100; + p->uartclk = 56000000; + break; + case 1500000: + case 3000000: + m = 48; + n = 100; + p->uartclk = 48000000; + break; + case 2500000: + m = 40; + n = 100; + p->uartclk = 40000000; + break; + default: + m = 2304; + n = 3125; + p->uartclk = 73728000; + } + + /* Reset the clock */ + reg = (m << BYT_PRV_CLK_M_VAL_SHIFT) | (n << BYT_PRV_CLK_N_VAL_SHIFT); + writel(reg, p->membase + BYT_PRV_CLK); + reg |= BYT_PRV_CLK_EN | BYT_PRV_CLK_UPDATE; + writel(reg, p->membase + BYT_PRV_CLK); + + serial8250_do_set_termios(p, termios, old); +} + static inline int dw8250_modify_msr(struct uart_port *p, int offset, int value) { struct dw8250_data *d = p->private_data; @@ -278,6 +342,7 @@ static int dw8250_probe_acpi(struct uart_8250_port *up, { const struct acpi_device_id *id; struct uart_port *p = &up->port; + struct dw8250_acpi_desc *acpi_desc; dw8250_setup_port(up); @@ -290,14 +355,18 @@ static int dw8250_probe_acpi(struct uart_8250_port *up, p->serial_out = dw8250_serial_out32; p->regshift = 2; - if (!p->uartclk) - p->uartclk = (unsigned int)id->driver_data; - up->dma = &data->dma; up->dma->rxconf.src_maxburst = p->fifosize / 4; up->dma->txconf.dst_maxburst = p->fifosize / 4; + acpi_desc = (struct dw8250_acpi_desc *)id->driver_data; + if (!acpi_desc) + return 0; + + if (acpi_desc->set_termios) + p->set_termios = acpi_desc->set_termios; + return 0; } @@ -445,12 +514,16 @@ static const struct of_device_id dw8250_of_match[] = { }; MODULE_DEVICE_TABLE(of, dw8250_of_match); +static struct dw8250_acpi_desc byt_8250_desc = { + .set_termios = byt_set_termios, +}; + static const struct acpi_device_id dw8250_acpi_match[] = { { "INT33C4", 0 }, { "INT33C5", 0 }, { "INT3434", 0 }, { "INT3435", 0 }, - { "80860F0A", 0 }, + { "80860F0A", (kernel_ulong_t)&byt_8250_desc}, { }, }; MODULE_DEVICE_TABLE(acpi, dw8250_acpi_match);