[PATCH] cpm_uart: Made non-console uart work
Pantelis Antoniou
pantelis.antoniou at gmail.com
Wed Aug 3 07:39:15 EST 2005
On Tuesday 02 August 2005 18:24, Vitaly Bordug wrote:
> Kumar, Pantelis,
>
[snip]
Some more comments.
> diff --git a/drivers/serial/cpm_uart/cpm_uart.h
b/drivers/serial/cpm_uart/cpm_uart.h
> --- a/drivers/serial/cpm_uart/cpm_uart.h
> +++ b/drivers/serial/cpm_uart/cpm_uart.h
> @@ -40,6 +40,8 @@
> #define TX_NUM_FIFO 4
> #define TX_BUF_SIZE 32
>
> +#define SCC_WAIT_CLOSING 100
> +
> struct uart_cpm_port {
> struct uart_port port;
> u16 rx_nrfifos;
> @@ -67,6 +69,8 @@ struct uart_cpm_port {
> int bits;
> /* Keep track of 'odd' SMC2 wirings */
> int is_portb;
> + /* wait on close if needed */
> + int wait_closing;
> };
>
> extern int cpm_uart_port_map[UART_NR];
> diff --git a/drivers/serial/cpm_uart/cpm_uart_core.c
b/drivers/serial/cpm_uart/cpm_uart_core.c
> --- a/drivers/serial/cpm_uart/cpm_uart_core.c
> +++ b/drivers/serial/cpm_uart/cpm_uart_core.c
> @@ -12,6 +12,7 @@
> *
> * Copyright (C) 2004 Freescale Semiconductor, Inc.
> * (C) 2004 Intracom, S.A.
> + * (C) 2005 MontaVista Software, Inc. by Vitaly Bordug
<vbordug at ru.mvista.com>
> *
> * This program is free software; you can redistribute it and/or modify
> * it under the terms of the GNU General Public License as published by
> @@ -143,10 +144,13 @@ static void cpm_uart_start_tx(struct uar
> }
>
> if (cpm_uart_tx_pump(port) != 0) {
> - if (IS_SMC(pinfo))
> + if (IS_SMC(pinfo)) {
> smcp->smc_smcm |= SMCM_TX;
> - else
> + smcp->smc_smcmr |= SMCMR_TEN;
> + } else {
> sccp->scc_sccm |= UART_SCCM_TX;
> + pinfo->sccp->scc_gsmrl |= SCC_GSMRL_ENT;
> + }
Why the need to mess with the global SCC transmit enable here?
It's dubious IMO.
> }
> }
>
> @@ -265,13 +269,15 @@ static void cpm_uart_int_rx(struct uart_
> } /* End while (i--) */
>
> /* This BD is ready to be used again. Clear status. get next */
> - bdp->cbd_sc &= ~(BD_SC_BR | BD_SC_FR | BD_SC_PR | BD_SC_OV);
> + bdp->cbd_sc &= ~(BD_SC_BR | BD_SC_FR | BD_SC_PR | BD_SC_OV | BD_SC_ID);
> bdp->cbd_sc |= BD_SC_EMPTY;
>
> - if (bdp->cbd_sc & BD_SC_WRAP)
> - bdp = pinfo->rx_bd_base;
> - else
> - bdp++;
> + if (bdp->cbd_datlen) {
> + if (bdp->cbd_sc & BD_SC_WRAP)
> + bdp = pinfo->rx_bd_base;
> + else
> + bdp++;
> + }
Why is that? Where ever we queue a buffer descriptor with zero length.
If we ever do that we're screwed in more ways than that.
> } /* End for (;;) */
>
> /* Write back buffer pointer */
> @@ -336,22 +342,22 @@ static irqreturn_t cpm_uart_int(int irq,
>
> if (IS_SMC(pinfo)) {
> events = smcp->smc_smce;
> + smcp->smc_smce = events;
> if (events & SMCM_BRKE)
> uart_handle_break(port);
> if (events & SMCM_RX)
> cpm_uart_int_rx(port, regs);
> if (events & SMCM_TX)
> cpm_uart_int_tx(port, regs);
> - smcp->smc_smce = events;
> } else {
> events = sccp->scc_scce;
> + sccp->scc_scce = events;
> if (events & UART_SCCM_BRKE)
> uart_handle_break(port);
> if (events & UART_SCCM_RX)
> cpm_uart_int_rx(port, regs);
> if (events & UART_SCCM_TX)
> cpm_uart_int_tx(port, regs);
> - sccp->scc_scce = events;
This is a good catch...
> }
> return (events) ? IRQ_HANDLED : IRQ_NONE;
> }
> @@ -360,6 +366,7 @@ static int cpm_uart_startup(struct uart_
> {
> int retval;
> struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
> + int line = pinfo - cpm_uart_ports;
>
> pr_debug("CPM uart[%d]:startup\n", port->line);
>
> @@ -374,18 +381,30 @@ static int cpm_uart_startup(struct uart_
> pinfo->smcp->smc_smcmr |= SMCMR_REN;
> } else {
> pinfo->sccp->scc_sccm |= UART_SCCM_RX;
> + pinfo->sccp->scc_gsmrl |= SCC_GSMRL_ENR;
dido as above.
> }
>
> + cpm_line_cr_cmd(line,CPM_CR_RESTART_TX);
> return 0;
> }
>
> +inline void cpm_uart_wait_until_send(struct uart_cpm_port *pinfo)
> +{
> + unsigned long orig_jiffies = jiffies;
> + while(1)
> + {
> + schedule_timeout(2);
> + if(time_after(jiffies, orig_jiffies + pinfo->wait_closing))
> + break;
> + }
> +}
> +
perhaps, more like...
unsigned long target_jiffies = jiffies + pinfo->wait_closing;
while (!time_after(jiffies, target_jiffies))
schedule();
> /*
> * Shutdown the uart
> */
> static void cpm_uart_shutdown(struct uart_port *port)
> {
> struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
> - int line = pinfo - cpm_uart_ports;
>
> pr_debug("CPM uart[%d]:shutdown\n", port->line);
>
> @@ -394,6 +413,12 @@ static void cpm_uart_shutdown(struct uar
>
> /* If the port is not the console, disable Rx and Tx. */
> if (!(pinfo->flags & FLAG_CONSOLE)) {
> + /* Wait for all the BDs marked sent */
> + while(!cpm_uart_tx_empty(port))
> + schedule_timeout(2);
> + if(pinfo->wait_closing)
> + cpm_uart_wait_until_send(pinfo);
> +
> /* Stop uarts */
> if (IS_SMC(pinfo)) {
> volatile smc_t *smcp = pinfo->smcp;
> @@ -405,9 +430,6 @@ static void cpm_uart_shutdown(struct uar
> sccp->scc_sccm &= ~(UART_SCCM_TX | UART_SCCM_RX);
> }
>
> - /* Shut them really down and reinit buffer descriptors */
> - cpm_line_cr_cmd(line, CPM_CR_STOP_TX);
> - cpm_uart_initbd(pinfo);
> }
> }
>
> @@ -569,7 +591,10 @@ static int cpm_uart_tx_pump(struct uart_
> /* Pick next descriptor and fill from buffer */
> bdp = pinfo->tx_cur;
>
> - p = bus_to_virt(bdp->cbd_bufaddr);
> + if (pinfo->dma_addr)
> + p=(u8*)((ulong)(pinfo->mem_addr) + bdp->cbd_bufaddr - pinfo->dma_addr);
> + else
> + p = bus_to_virt(bdp->cbd_bufaddr);
this looks bogus to me...
> *p++ = xmit->buf[xmit->tail];
> bdp->cbd_datlen = 1;
> bdp->cbd_sc |= BD_SC_READY;
> @@ -595,7 +620,10 @@ static int cpm_uart_tx_pump(struct uart_
>
> while (!(bdp->cbd_sc & BD_SC_READY) && (xmit->tail != xmit->head)) {
> count = 0;
> - p = bus_to_virt(bdp->cbd_bufaddr);
> + if (pinfo->dma_addr)
> + p=(u8*)((ulong)(pinfo->mem_addr) + bdp->cbd_bufaddr - pinfo->dma_addr);
> + else
> + p = bus_to_virt(bdp->cbd_bufaddr);
> while (count < pinfo->tx_fifosize) {
> *p++ = xmit->buf[xmit->tail];
> xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
> @@ -606,6 +634,7 @@ static int cpm_uart_tx_pump(struct uart_
> }
> bdp->cbd_datlen = count;
> bdp->cbd_sc |= BD_SC_READY;
> + __asm__("eieio");
> /* Get next BD. */
> if (bdp->cbd_sc & BD_SC_WRAP)
> bdp = pinfo->tx_bd_base;
> @@ -632,6 +661,7 @@ static void cpm_uart_initbd(struct uart_
> {
> int i;
> u8 *mem_addr;
> + u8* dma_addr;
> volatile cbd_t *bdp;
>
> pr_debug("CPM uart[%d]:initbd\n", pinfo->port.line);
> @@ -641,14 +671,23 @@ static void cpm_uart_initbd(struct uart_
> * virtual address for us to work with.
> */
> mem_addr = pinfo->mem_addr;
> + dma_addr = (u8*)(pinfo->dma_addr);
> bdp = pinfo->rx_cur = pinfo->rx_bd_base;
> for (i = 0; i < (pinfo->rx_nrfifos - 1); i++, bdp++) {
> - bdp->cbd_bufaddr = virt_to_bus(mem_addr);
> + if (pinfo->dma_addr)
> + bdp->cbd_bufaddr = (ulong)dma_addr;
> + else
> + bdp->cbd_bufaddr = virt_to_bus(mem_addr);
> bdp->cbd_sc = BD_SC_EMPTY | BD_SC_INTRPT;
> + bdp->cbd_datlen = 0;
> mem_addr += pinfo->rx_fifosize;
> + dma_addr += pinfo->rx_fifosize;
> }
> -
> - bdp->cbd_bufaddr = virt_to_bus(mem_addr);
> + if (pinfo->dma_addr)
> + bdp->cbd_bufaddr = (ulong)dma_addr;
> + else
> + bdp->cbd_bufaddr = virt_to_bus(mem_addr);
> + bdp->cbd_datlen = 0;
> bdp->cbd_sc = BD_SC_WRAP | BD_SC_EMPTY | BD_SC_INTRPT;
>
> /* Set the physical address of the host memory
> @@ -656,14 +695,21 @@ static void cpm_uart_initbd(struct uart_
> * virtual address for us to work with.
> */
> mem_addr = pinfo->mem_addr + L1_CACHE_ALIGN(pinfo->rx_nrfifos *
pinfo->rx_fifosize);
> + dma_addr = (u8*)(pinfo->dma_addr + L1_CACHE_ALIGN(pinfo->rx_nrfifos *
pinfo->rx_fifosize));
> bdp = pinfo->tx_cur = pinfo->tx_bd_base;
> for (i = 0; i < (pinfo->tx_nrfifos - 1); i++, bdp++) {
> - bdp->cbd_bufaddr = virt_to_bus(mem_addr);
> + if (pinfo->dma_addr)
> + bdp->cbd_bufaddr = (ulong)dma_addr;
> + else
> + bdp->cbd_bufaddr = virt_to_bus(mem_addr);
> bdp->cbd_sc = BD_SC_INTRPT;
> mem_addr += pinfo->tx_fifosize;
> + dma_addr += pinfo->tx_fifosize;
> }
> -
> - bdp->cbd_bufaddr = virt_to_bus(mem_addr);
> + if (pinfo->dma_addr)
> + bdp->cbd_bufaddr = (ulong)dma_addr;
> + else
> + bdp->cbd_bufaddr = virt_to_bus(mem_addr);
> bdp->cbd_sc = BD_SC_WRAP | BD_SC_INTRPT;
> }
>
> @@ -763,6 +809,8 @@ static void cpm_uart_init_smc(struct uar
> /* Using idle charater time requires some additional tuning. */
> up->smc_mrblr = pinfo->rx_fifosize;
> up->smc_maxidl = pinfo->rx_fifosize;
> + up->smc_brklen = 0;
> + up->smc_brkec = 0;
> up->smc_brkcr = 1;
>
> cpm_line_cr_cmd(line, CPM_CR_INIT_TRX);
> @@ -815,6 +863,10 @@ static int cpm_uart_request_port(struct
> return ret;
>
> cpm_uart_initbd(pinfo);
> + if (IS_SMC(pinfo))
> + cpm_uart_init_smc(pinfo);
> + else
> + cpm_uart_init_scc(pinfo);
>
> return 0;
> }
> @@ -902,6 +954,7 @@ struct uart_cpm_port cpm_uart_ports[UART
> .rx_nrfifos = RX_NUM_FIFO,
> .rx_fifosize = RX_BUF_SIZE,
> .set_lineif = scc1_lineif,
> + .wait_closing = SCC_WAIT_CLOSING,
> },
> [UART_SCC2] = {
> .port = {
> @@ -915,6 +968,7 @@ struct uart_cpm_port cpm_uart_ports[UART
> .rx_nrfifos = RX_NUM_FIFO,
> .rx_fifosize = RX_BUF_SIZE,
> .set_lineif = scc2_lineif,
> + .wait_closing = SCC_WAIT_CLOSING,
> },
> [UART_SCC3] = {
> .port = {
> @@ -928,6 +982,7 @@ struct uart_cpm_port cpm_uart_ports[UART
> .rx_nrfifos = RX_NUM_FIFO,
> .rx_fifosize = RX_BUF_SIZE,
> .set_lineif = scc3_lineif,
> + .wait_closing = SCC_WAIT_CLOSING,
> },
> [UART_SCC4] = {
> .port = {
> @@ -941,6 +996,7 @@ struct uart_cpm_port cpm_uart_ports[UART
> .rx_nrfifos = RX_NUM_FIFO,
> .rx_fifosize = RX_BUF_SIZE,
> .set_lineif = scc4_lineif,
> + .wait_closing = SCC_WAIT_CLOSING,
> },
> };
>
> @@ -1081,6 +1137,7 @@ static int __init cpm_uart_console_setup
> return ret;
>
> cpm_uart_initbd(pinfo);
> + cpm_uart_init_scc(pinfo);
>
> if (IS_SMC(pinfo))
> cpm_uart_init_smc(pinfo);
> diff --git a/drivers/serial/cpm_uart/cpm_uart_cpm1.c
b/drivers/serial/cpm_uart/cpm_uart_cpm1.c
> --- a/drivers/serial/cpm_uart/cpm_uart_cpm1.c
> +++ b/drivers/serial/cpm_uart/cpm_uart_cpm1.c
> @@ -82,6 +82,16 @@ void cpm_line_cr_cmd(int line, int cmd)
> void smc1_lineif(struct uart_cpm_port *pinfo)
> {
> volatile cpm8xx_t *cp = cpmp;
> +
> +#if defined (CONFIG_MPC885ADS)
> + /* Enable SMC1 transceivers */
> + {
> + cp->cp_pepar |= 0x000000c0;
> + cp->cp_pedir &= ~0x000000c0;
> + cp->cp_peso &= ~0x00000040;
> + cp->cp_peso |= 0x00000080;
> + }
> +#elif defined (CONFIG_MPC86XADS)
> unsigned int iobits = 0x000000c0;
>
> if (!pinfo->is_portb) {
> @@ -93,41 +103,31 @@ void smc1_lineif(struct uart_cpm_port *p
> ((immap_t *)IMAP_ADDR)->im_ioport.iop_padir &= ~iobits;
> ((immap_t *)IMAP_ADDR)->im_ioport.iop_paodr &= ~iobits;
> }
> -
> -#ifdef CONFIG_MPC885ADS
> - /* Enable SMC1 transceivers */
> - {
> - volatile uint __iomem *bcsr1 = ioremap(BCSR1, 4);
> - uint tmp;
> -
> - tmp = in_be32(bcsr1);
> - tmp &= ~BCSR1_RS232EN_1;
> - out_be32(bcsr1, tmp);
> - iounmap(bcsr1);
> - }
> #endif
> -
> pinfo->brg = 1;
> }
>
> void smc2_lineif(struct uart_cpm_port *pinfo)
> {
> -#ifdef CONFIG_MPC885ADS
> volatile cpm8xx_t *cp = cpmp;
> - volatile uint __iomem *bcsr1;
> - uint tmp;
> -
> +#if defined (CONFIG_MPC885ADS)
> cp->cp_pepar |= 0x00000c00;
> cp->cp_pedir &= ~0x00000c00;
> cp->cp_peso &= ~0x00000400;
> cp->cp_peso |= 0x00000800;
> +#elif defined (CONFIG_MPC86XADS)
> + unsigned int iobits = 0x00000c00;
> +
> + if (!pinfo->is_portb) {
> + cp->cp_pbpar |= iobits;
> + cp->cp_pbdir &= ~iobits;
> + cp->cp_pbodr &= ~iobits;
> + } else {
> + ((immap_t *)IMAP_ADDR)->im_ioport.iop_papar |= iobits;
> + ((immap_t *)IMAP_ADDR)->im_ioport.iop_padir &= ~iobits;
> + ((immap_t *)IMAP_ADDR)->im_ioport.iop_paodr &= ~iobits;
> + }
>
> - /* Enable SMC2 transceivers */
> - bcsr1 = ioremap(BCSR1, 4);
> - tmp = in_be32(bcsr1);
> - tmp &= ~BCSR1_RS232EN_2;
> - out_be32(bcsr1, tmp);
> - iounmap(bcsr1);
> #endif
>
> pinfo->brg = 2;
>
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