mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-19 19:28:36 +00:00
11c1a87893
The probe logic sets up the pointer to the platform data in the device tree decode method. It should be done in the probe() method, and anyway the device tree decode method can't be used when CONFIG_OF_CONTROL is not enabled. Fix these two problems. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Tom Rini <trini@ti.com>
309 lines
8.4 KiB
C
309 lines
8.4 KiB
C
/*
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* COM1 NS16550 support
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* originally from linux source (arch/powerpc/boot/ns16550.c)
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* modified to use CONFIG_SYS_ISA_MEM and new defines
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*/
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#include <common.h>
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#include <dm.h>
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#include <errno.h>
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#include <fdtdec.h>
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#include <ns16550.h>
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#include <serial.h>
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#include <watchdog.h>
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#include <linux/types.h>
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#include <asm/io.h>
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DECLARE_GLOBAL_DATA_PTR;
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#define UART_LCRVAL UART_LCR_8N1 /* 8 data, 1 stop, no parity */
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#define UART_MCRVAL (UART_MCR_DTR | \
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UART_MCR_RTS) /* RTS/DTR */
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#define UART_FCRVAL (UART_FCR_FIFO_EN | \
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UART_FCR_RXSR | \
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UART_FCR_TXSR) /* Clear & enable FIFOs */
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#ifndef CONFIG_DM_SERIAL
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#ifdef CONFIG_SYS_NS16550_PORT_MAPPED
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#define serial_out(x, y) outb(x, (ulong)y)
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#define serial_in(y) inb((ulong)y)
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#elif defined(CONFIG_SYS_NS16550_MEM32) && (CONFIG_SYS_NS16550_REG_SIZE > 0)
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#define serial_out(x, y) out_be32(y, x)
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#define serial_in(y) in_be32(y)
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#elif defined(CONFIG_SYS_NS16550_MEM32) && (CONFIG_SYS_NS16550_REG_SIZE < 0)
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#define serial_out(x, y) out_le32(y, x)
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#define serial_in(y) in_le32(y)
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#else
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#define serial_out(x, y) writeb(x, y)
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#define serial_in(y) readb(y)
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#endif
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#endif /* !CONFIG_DM_SERIAL */
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#if defined(CONFIG_SOC_KEYSTONE)
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#define UART_REG_VAL_PWREMU_MGMT_UART_DISABLE 0
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#define UART_REG_VAL_PWREMU_MGMT_UART_ENABLE ((1 << 14) | (1 << 13) | (1 << 0))
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#undef UART_MCRVAL
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#ifdef CONFIG_SERIAL_HW_FLOW_CONTROL
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#define UART_MCRVAL (UART_MCR_RTS | UART_MCR_AFE)
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#else
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#define UART_MCRVAL (UART_MCR_RTS)
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#endif
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#endif
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#ifndef CONFIG_SYS_NS16550_IER
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#define CONFIG_SYS_NS16550_IER 0x00
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#endif /* CONFIG_SYS_NS16550_IER */
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#ifdef CONFIG_DM_SERIAL
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static void ns16550_writeb(NS16550_t port, int offset, int value)
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{
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struct ns16550_platdata *plat = port->plat;
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unsigned char *addr;
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offset *= 1 << plat->reg_shift;
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addr = map_sysmem(plat->base, 0) + offset;
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/*
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* As far as we know it doesn't make sense to support selection of
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* these options at run-time, so use the existing CONFIG options.
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*/
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#ifdef CONFIG_SYS_NS16550_PORT_MAPPED
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outb(value, addr);
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#elif defined(CONFIG_SYS_NS16550_MEM32) && !defined(CONFIG_SYS_BIG_ENDIAN)
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out_le32(addr, value);
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#elif defined(CONFIG_SYS_NS16550_MEM32) && defined(CONFIG_SYS_BIG_ENDIAN)
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out_be32(addr, value);
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#elif defined(CONFIG_SYS_BIG_ENDIAN)
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writeb(value, addr + (1 << plat->reg_shift) - 1);
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#else
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writeb(value, addr);
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#endif
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}
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static int ns16550_readb(NS16550_t port, int offset)
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{
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struct ns16550_platdata *plat = port->plat;
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unsigned char *addr;
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offset *= 1 << plat->reg_shift;
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addr = map_sysmem(plat->base, 0) + offset;
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#ifdef CONFIG_SYS_NS16550_PORT_MAPPED
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return inb(addr);
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#elif defined(CONFIG_SYS_NS16550_MEM32) && !defined(CONFIG_SYS_BIG_ENDIAN)
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return in_le32(addr);
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#elif defined(CONFIG_SYS_NS16550_MEM32) && defined(CONFIG_SYS_BIG_ENDIAN)
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return in_be32(addr);
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#elif defined(CONFIG_SYS_BIG_ENDIAN)
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return readb(addr + (1 << plat->reg_shift) - 1);
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#else
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return readb(addr);
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#endif
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}
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/* We can clean these up once everything is moved to driver model */
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#define serial_out(value, addr) \
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ns16550_writeb(com_port, addr - (unsigned char *)com_port, value)
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#define serial_in(addr) \
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ns16550_readb(com_port, addr - (unsigned char *)com_port)
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#endif
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int ns16550_calc_divisor(NS16550_t port, int clock, int baudrate)
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{
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const unsigned int mode_x_div = 16;
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#ifdef CONFIG_OMAP1510
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/* If can't cleanly clock 115200 set div to 1 */
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if ((clock == 12000000) && (baudrate == 115200)) {
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port->osc_12m_sel = OSC_12M_SEL; /* enable 6.5 * divisor */
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return 1; /* return 1 for base divisor */
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}
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port->osc_12m_sel = 0; /* clear if previsouly set */
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#endif
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return DIV_ROUND_CLOSEST(clock, mode_x_div * baudrate);
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}
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static void NS16550_setbrg(NS16550_t com_port, int baud_divisor)
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{
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serial_out(UART_LCR_BKSE | UART_LCRVAL, &com_port->lcr);
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serial_out(baud_divisor & 0xff, &com_port->dll);
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serial_out((baud_divisor >> 8) & 0xff, &com_port->dlm);
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serial_out(UART_LCRVAL, &com_port->lcr);
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}
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void NS16550_init(NS16550_t com_port, int baud_divisor)
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{
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#if (defined(CONFIG_SPL_BUILD) && defined(CONFIG_OMAP34XX))
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/*
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* On some OMAP3 devices when UART3 is configured for boot mode before
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* SPL starts only THRE bit is set. We have to empty the transmitter
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* before initialization starts.
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*/
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if ((serial_in(&com_port->lsr) & (UART_LSR_TEMT | UART_LSR_THRE))
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== UART_LSR_THRE) {
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if (baud_divisor != -1)
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NS16550_setbrg(com_port, baud_divisor);
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serial_out(0, &com_port->mdr1);
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}
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#endif
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while (!(serial_in(&com_port->lsr) & UART_LSR_TEMT))
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;
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serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier);
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#if defined(CONFIG_OMAP) || defined(CONFIG_AM33XX) || \
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defined(CONFIG_TI81XX) || defined(CONFIG_AM43XX)
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serial_out(0x7, &com_port->mdr1); /* mode select reset TL16C750*/
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#endif
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NS16550_setbrg(com_port, 0);
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serial_out(UART_MCRVAL, &com_port->mcr);
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serial_out(UART_FCRVAL, &com_port->fcr);
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if (baud_divisor != -1)
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NS16550_setbrg(com_port, baud_divisor);
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#if defined(CONFIG_OMAP) || \
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defined(CONFIG_AM33XX) || defined(CONFIG_SOC_DA8XX) || \
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defined(CONFIG_TI81XX) || defined(CONFIG_AM43XX)
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/* /16 is proper to hit 115200 with 48MHz */
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serial_out(0, &com_port->mdr1);
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#endif /* CONFIG_OMAP */
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#if defined(CONFIG_SOC_KEYSTONE)
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serial_out(UART_REG_VAL_PWREMU_MGMT_UART_ENABLE, &com_port->regC);
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#endif
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}
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#ifndef CONFIG_NS16550_MIN_FUNCTIONS
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void NS16550_reinit(NS16550_t com_port, int baud_divisor)
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{
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serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier);
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NS16550_setbrg(com_port, 0);
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serial_out(UART_MCRVAL, &com_port->mcr);
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serial_out(UART_FCRVAL, &com_port->fcr);
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NS16550_setbrg(com_port, baud_divisor);
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}
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#endif /* CONFIG_NS16550_MIN_FUNCTIONS */
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void NS16550_putc(NS16550_t com_port, char c)
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{
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while ((serial_in(&com_port->lsr) & UART_LSR_THRE) == 0)
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;
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serial_out(c, &com_port->thr);
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/*
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* Call watchdog_reset() upon newline. This is done here in putc
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* since the environment code uses a single puts() to print the complete
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* environment upon "printenv". So we can't put this watchdog call
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* in puts().
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*/
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if (c == '\n')
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WATCHDOG_RESET();
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}
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#ifndef CONFIG_NS16550_MIN_FUNCTIONS
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char NS16550_getc(NS16550_t com_port)
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{
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while ((serial_in(&com_port->lsr) & UART_LSR_DR) == 0) {
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#if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_USB_TTY)
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extern void usbtty_poll(void);
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usbtty_poll();
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#endif
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WATCHDOG_RESET();
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}
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return serial_in(&com_port->rbr);
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}
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int NS16550_tstc(NS16550_t com_port)
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{
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return (serial_in(&com_port->lsr) & UART_LSR_DR) != 0;
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}
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#endif /* CONFIG_NS16550_MIN_FUNCTIONS */
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#ifdef CONFIG_DM_SERIAL
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static int ns16550_serial_putc(struct udevice *dev, const char ch)
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{
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struct NS16550 *const com_port = dev_get_priv(dev);
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if (!(serial_in(&com_port->lsr) & UART_LSR_THRE))
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return -EAGAIN;
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serial_out(ch, &com_port->thr);
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/*
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* Call watchdog_reset() upon newline. This is done here in putc
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* since the environment code uses a single puts() to print the complete
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* environment upon "printenv". So we can't put this watchdog call
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* in puts().
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*/
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if (ch == '\n')
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WATCHDOG_RESET();
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return 0;
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}
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static int ns16550_serial_pending(struct udevice *dev, bool input)
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{
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struct NS16550 *const com_port = dev_get_priv(dev);
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if (input)
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return serial_in(&com_port->lsr) & UART_LSR_DR ? 1 : 0;
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else
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return serial_in(&com_port->lsr) & UART_LSR_THRE ? 0 : 1;
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}
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static int ns16550_serial_getc(struct udevice *dev)
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{
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struct NS16550 *const com_port = dev_get_priv(dev);
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if (!(serial_in(&com_port->lsr) & UART_LSR_DR))
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return -EAGAIN;
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return serial_in(&com_port->rbr);
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}
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static int ns16550_serial_setbrg(struct udevice *dev, int baudrate)
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{
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struct NS16550 *const com_port = dev_get_priv(dev);
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struct ns16550_platdata *plat = com_port->plat;
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int clock_divisor;
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clock_divisor = ns16550_calc_divisor(com_port, plat->clock, baudrate);
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NS16550_setbrg(com_port, clock_divisor);
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return 0;
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}
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int ns16550_serial_probe(struct udevice *dev)
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{
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struct NS16550 *const com_port = dev_get_priv(dev);
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com_port->plat = dev_get_platdata(dev);
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NS16550_init(com_port, -1);
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return 0;
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}
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#ifdef CONFIG_OF_CONTROL
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int ns16550_serial_ofdata_to_platdata(struct udevice *dev)
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{
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struct ns16550_platdata *plat = dev->platdata;
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fdt_addr_t addr;
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addr = fdtdec_get_addr(gd->fdt_blob, dev->of_offset, "reg");
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if (addr == FDT_ADDR_T_NONE)
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return -EINVAL;
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plat->base = addr;
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plat->reg_shift = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
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"reg-shift", 1);
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return 0;
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}
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#endif
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const struct dm_serial_ops ns16550_serial_ops = {
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.putc = ns16550_serial_putc,
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.pending = ns16550_serial_pending,
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.getc = ns16550_serial_getc,
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.setbrg = ns16550_serial_setbrg,
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};
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#endif /* CONFIG_DM_SERIAL */
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