diff options
Diffstat (limited to 'target/linux/xburst/patches-2.6.34/103-serial.patch')
| -rw-r--r-- | target/linux/xburst/patches-2.6.34/103-serial.patch | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/target/linux/xburst/patches-2.6.34/103-serial.patch b/target/linux/xburst/patches-2.6.34/103-serial.patch new file mode 100644 index 0000000000..162dc627ba --- /dev/null +++ b/target/linux/xburst/patches-2.6.34/103-serial.patch @@ -0,0 +1,178 @@ +From 6e138e4c3bfa5fb272d215107d85385456281ceb Mon Sep 17 00:00:00 2001 +From: Lars-Peter Clausen <lars@metafoo.de> +Date: Sat, 24 Apr 2010 12:19:30 +0200 +Subject: [PATCH] Add jz4740 serial driver + +--- + drivers/serial/8250.c | 104 ++++++++++++++++++++++++++++++++++++++++++++++++- + 1 files changed, 103 insertions(+), 1 deletions(-) + +diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c +index 2b1ea3d..4c41c57 100644 +--- a/drivers/serial/8250.c ++++ b/drivers/serial/8250.c +@@ -200,7 +200,7 @@ static const struct serial8250_config uart_config[] = { + [PORT_16550A] = { + .name = "16550A", + .fifo_size = 16, +- .tx_loadsz = 16, ++ .tx_loadsz = 8, + .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, + .flags = UART_CAP_FIFO, + }, +@@ -407,6 +407,10 @@ static unsigned int mem_serial_in(struct uart_port *p, int offset) + static void mem_serial_out(struct uart_port *p, int offset, int value) + { + offset = map_8250_out_reg(p, offset) << p->regshift; ++#if defined(CONFIG_JZSOC) ++ if (offset == (UART_FCR << p->regshift)) ++ value |= 0x10; /* set FCR.UUE */ ++#endif + writeb(value, p->membase + offset); + } + +@@ -2209,6 +2213,83 @@ static void serial8250_shutdown(struct uart_port *port) + serial_unlink_irq_chain(up); + } + ++#if defined(CONFIG_JZSOC) && !defined(CONFIG_SOC_JZ4730) ++static unsigned short quot1[3] = {0}; /* quot[0]:baud_div, quot[1]:umr, quot[2]:uacr */ ++static unsigned short * serial8250_get_divisor(struct uart_port *port, unsigned int baud) ++{ ++ int err, sum, i, j; ++ int a[12], b[12]; ++ unsigned short div, umr, uacr; ++ unsigned short umr_best, div_best, uacr_best; ++ long long t0, t1, t2, t3; ++ ++ sum = 0; ++ umr_best = div_best = uacr_best = 0; ++ div = 1; ++ ++ if ((port->uartclk % (16 * baud)) == 0) { ++ quot1[0] = port->uartclk / (16 * baud); ++ quot1[1] = 16; ++ quot1[2] = 0; ++ return quot1; ++ } ++ ++ while (1) { ++ umr = port->uartclk / (baud * div); ++ if (umr > 32) { ++ div++; ++ continue; ++ } ++ if (umr < 4) { ++ break; ++ } ++ for (i = 0; i < 12; i++) { ++ a[i] = umr; ++ b[i] = 0; ++ sum = 0; ++ for (j = 0; j <= i; j++) { ++ sum += a[j]; ++ } ++ ++ /* the precision could be 1/2^(36) due to the value of t0 */ ++ t0 = 0x1000000000LL; ++ t1 = (i + 1) * t0; ++ t2 = (sum * div) * t0; ++ t3 = div * t0; ++ do_div(t1, baud); ++ do_div(t2, port->uartclk); ++ do_div(t3, (2 * port->uartclk)); ++ err = t1 - t2 - t3; ++ ++ if (err > 0) { ++ a[i] += 1; ++ b[i] = 1; ++ } ++ } ++ ++ uacr = 0; ++ for (i = 0; i < 12; i++) { ++ if (b[i] == 1) { ++ uacr |= 1 << i; ++ } ++ } ++ ++ /* the best value of umr should be near 16, and the value of uacr should better be smaller */ ++ if (abs(umr - 16) < abs(umr_best - 16) || (abs(umr - 16) == abs(umr_best - 16) && uacr_best > uacr)) { ++ div_best = div; ++ umr_best = umr; ++ uacr_best = uacr; ++ } ++ div++; ++ } ++ ++ quot1[0] = div_best; ++ quot1[1] = umr_best; ++ quot1[2] = uacr_best; ++ ++ return quot1; ++} ++#else + static unsigned int serial8250_get_divisor(struct uart_port *port, unsigned int baud) + { + unsigned int quot; +@@ -2228,6 +2309,7 @@ static unsigned int serial8250_get_divisor(struct uart_port *port, unsigned int + + return quot; + } ++#endif + + static void + serial8250_set_termios(struct uart_port *port, struct ktermios *termios, +@@ -2237,6 +2319,9 @@ serial8250_set_termios(struct uart_port *port, struct ktermios *termios, + unsigned char cval, fcr = 0; + unsigned long flags; + unsigned int baud, quot; ++#if defined(CONFIG_JZSOC) && !defined(CONFIG_SOC_JZ4730) ++ unsigned short *quot1; ++#endif + + switch (termios->c_cflag & CSIZE) { + case CS5: +@@ -2271,7 +2356,12 @@ serial8250_set_termios(struct uart_port *port, struct ktermios *termios, + baud = uart_get_baud_rate(port, termios, old, + port->uartclk / 16 / 0xffff, + port->uartclk / 16); ++#if defined(CONFIG_JZSOC) && !defined(CONFIG_SOC_JZ4730) ++ quot1 = serial8250_get_divisor(port, baud); ++ quot = quot1[0]; /* not usefull, just let gcc happy */ ++#else + quot = serial8250_get_divisor(port, baud); ++#endif + + /* + * Oxford Semi 952 rev B workaround +@@ -2349,6 +2439,10 @@ serial8250_set_termios(struct uart_port *port, struct ktermios *termios, + if (up->capabilities & UART_CAP_UUE) + up->ier |= UART_IER_UUE | UART_IER_RTOIE; + ++#ifdef CONFIG_JZSOC ++ up->ier |= UART_IER_RTOIE; /* Set this flag, or very slow */ ++#endif ++ + serial_out(up, UART_IER, up->ier); + + if (up->capabilities & UART_CAP_EFR) { +@@ -2383,7 +2477,15 @@ serial8250_set_termios(struct uart_port *port, struct ktermios *termios, + serial_outp(up, UART_LCR, cval | UART_LCR_DLAB);/* set DLAB */ + } + ++#if defined(CONFIG_JZSOC) && !defined(CONFIG_SOC_JZ4730) ++#define UART_UMR 9 ++#define UART_UACR 10 ++ serial_dl_write(up, quot1[0]); ++ serial_outp(up, UART_UMR, quot1[1]); ++ serial_outp(up, UART_UACR, quot1[2]); ++#else + serial_dl_write(up, quot); ++#endif + + /* + * LCR DLAB must be set to enable 64-byte FIFO mode. If the FCR +-- +1.5.6.5 + |