diff options
Diffstat (limited to 'drivers/tty/serial/pch_uart.c')
| -rw-r--r-- | drivers/tty/serial/pch_uart.c | 562 |
1 files changed, 393 insertions, 169 deletions
diff --git a/drivers/tty/serial/pch_uart.c b/drivers/tty/serial/pch_uart.c index 17ae65762d1..0cb6a8e52bd 100644 --- a/drivers/tty/serial/pch_uart.c +++ b/drivers/tty/serial/pch_uart.c @@ -14,21 +14,25 @@ *along with this program; if not, write to the Free Software *Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA. */ +#if defined(CONFIG_SERIAL_PCH_UART_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) +#define SUPPORT_SYSRQ +#endif #include <linux/kernel.h> #include <linux/serial_reg.h> #include <linux/slab.h> #include <linux/module.h> #include <linux/pci.h> +#include <linux/console.h> #include <linux/serial_core.h> #include <linux/tty.h> #include <linux/tty_flip.h> #include <linux/interrupt.h> #include <linux/io.h> #include <linux/dmi.h> -#include <linux/console.h> #include <linux/nmi.h> #include <linux/delay.h> +#include <linux/debugfs.h> #include <linux/dmaengine.h> #include <linux/pch_dma.h> @@ -38,6 +42,7 @@ enum { PCH_UART_HANDLED_RX_ERR_INT_SHIFT, PCH_UART_HANDLED_RX_TRG_INT_SHIFT, PCH_UART_HANDLED_MS_INT_SHIFT, + PCH_UART_HANDLED_LS_INT_SHIFT, }; enum { @@ -62,6 +67,8 @@ enum { PCH_UART_HANDLED_RX_TRG_INT_SHIFT)<<1)) #define PCH_UART_HANDLED_MS_INT (1<<((PCH_UART_HANDLED_MS_INT_SHIFT)<<1)) +#define PCH_UART_HANDLED_LS_INT (1<<((PCH_UART_HANDLED_LS_INT_SHIFT)<<1)) + #define PCH_UART_RBR 0x00 #define PCH_UART_THR 0x00 @@ -144,6 +151,8 @@ enum { #define PCH_UART_DLL 0x00 #define PCH_UART_DLM 0x01 +#define PCH_UART_BRCSR 0x0E + #define PCH_UART_IID_RLS (PCH_UART_IIR_REI) #define PCH_UART_IID_RDR (PCH_UART_IIR_RRI) #define PCH_UART_IID_RDR_TO (PCH_UART_IIR_RRI | PCH_UART_IIR_TOI) @@ -203,7 +212,12 @@ enum { #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE) -#define DEFAULT_BAUD_RATE 1843200 /* 1.8432MHz */ +#define DEFAULT_UARTCLK 1843200 /* 1.8432 MHz */ +#define CMITC_UARTCLK 192000000 /* 192.0000 MHz */ +#define FRI2_64_UARTCLK 64000000 /* 64.0000 MHz */ +#define FRI2_48_UARTCLK 48000000 /* 48.0000 MHz */ +#define NTC1_UARTCLK 64000000 /* 64.0000 MHz */ +#define MINNOW_UARTCLK 50000000 /* 50.0000 MHz */ struct pch_uart_buffer { unsigned char *buf; @@ -218,11 +232,10 @@ struct eg20t_port { unsigned int iobase; struct pci_dev *pdev; int fifo_size; - int base_baud; + unsigned int uartclk; int start_tx; int start_rx; int tx_empty; - int int_dis_flag; int trigger; int trigger_level; struct pch_uart_buffer rxbuf; @@ -230,7 +243,6 @@ struct eg20t_port { unsigned int fcr; unsigned int mcr; unsigned int use_dma; - unsigned int use_dma_flag; struct dma_async_tx_descriptor *desc_tx; struct dma_async_tx_descriptor *desc_rx; struct pch_dma_slave param_tx; @@ -243,6 +255,13 @@ struct eg20t_port { int tx_dma_use; void *rx_buf_virt; dma_addr_t rx_buf_dma; + + struct dentry *debugfs; +#define IRQ_NAME_SIZE 17 + char irq_name[IRQ_NAME_SIZE]; + + /* protect the eg20t_port private structure and io access to membase */ + spinlock_t lock; }; /** @@ -287,26 +306,133 @@ static struct pch_uart_driver_data drv_dat[] = { static struct eg20t_port *pch_uart_ports[PCH_UART_NR]; #endif static unsigned int default_baud = 9600; +static unsigned int user_uartclk = 0; static const int trigger_level_256[4] = { 1, 64, 128, 224 }; static const int trigger_level_64[4] = { 1, 16, 32, 56 }; static const int trigger_level_16[4] = { 1, 4, 8, 14 }; static const int trigger_level_1[4] = { 1, 1, 1, 1 }; -static void pch_uart_hal_request(struct pci_dev *pdev, int fifosize, - int base_baud) +#ifdef CONFIG_DEBUG_FS + +#define PCH_REGS_BUFSIZE 1024 + + +static ssize_t port_show_regs(struct file *file, char __user *user_buf, + size_t count, loff_t *ppos) { - struct eg20t_port *priv = pci_get_drvdata(pdev); + struct eg20t_port *priv = file->private_data; + char *buf; + u32 len = 0; + ssize_t ret; + unsigned char lcr; + + buf = kzalloc(PCH_REGS_BUFSIZE, GFP_KERNEL); + if (!buf) + return 0; - priv->trigger_level = 1; - priv->fcr = 0; + len += snprintf(buf + len, PCH_REGS_BUFSIZE - len, + "PCH EG20T port[%d] regs:\n", priv->port.line); + + len += snprintf(buf + len, PCH_REGS_BUFSIZE - len, + "=================================\n"); + len += snprintf(buf + len, PCH_REGS_BUFSIZE - len, + "IER: \t0x%02x\n", ioread8(priv->membase + UART_IER)); + len += snprintf(buf + len, PCH_REGS_BUFSIZE - len, + "IIR: \t0x%02x\n", ioread8(priv->membase + UART_IIR)); + len += snprintf(buf + len, PCH_REGS_BUFSIZE - len, + "LCR: \t0x%02x\n", ioread8(priv->membase + UART_LCR)); + len += snprintf(buf + len, PCH_REGS_BUFSIZE - len, + "MCR: \t0x%02x\n", ioread8(priv->membase + UART_MCR)); + len += snprintf(buf + len, PCH_REGS_BUFSIZE - len, + "LSR: \t0x%02x\n", ioread8(priv->membase + UART_LSR)); + len += snprintf(buf + len, PCH_REGS_BUFSIZE - len, + "MSR: \t0x%02x\n", ioread8(priv->membase + UART_MSR)); + len += snprintf(buf + len, PCH_REGS_BUFSIZE - len, + "BRCSR: \t0x%02x\n", + ioread8(priv->membase + PCH_UART_BRCSR)); + + lcr = ioread8(priv->membase + UART_LCR); + iowrite8(PCH_UART_LCR_DLAB, priv->membase + UART_LCR); + len += snprintf(buf + len, PCH_REGS_BUFSIZE - len, + "DLL: \t0x%02x\n", ioread8(priv->membase + UART_DLL)); + len += snprintf(buf + len, PCH_REGS_BUFSIZE - len, + "DLM: \t0x%02x\n", ioread8(priv->membase + UART_DLM)); + iowrite8(lcr, priv->membase + UART_LCR); + + if (len > PCH_REGS_BUFSIZE) + len = PCH_REGS_BUFSIZE; + + ret = simple_read_from_buffer(user_buf, count, ppos, buf, len); + kfree(buf); + return ret; } -static unsigned int get_msr(struct eg20t_port *priv, void __iomem *base) +static const struct file_operations port_regs_ops = { + .owner = THIS_MODULE, + .open = simple_open, + .read = port_show_regs, + .llseek = default_llseek, +}; +#endif /* CONFIG_DEBUG_FS */ + +static struct dmi_system_id pch_uart_dmi_table[] = { + { + .ident = "CM-iTC", + { + DMI_MATCH(DMI_BOARD_NAME, "CM-iTC"), + }, + (void *)CMITC_UARTCLK, + }, + { + .ident = "FRI2", + { + DMI_MATCH(DMI_BIOS_VERSION, "FRI2"), + }, + (void *)FRI2_64_UARTCLK, + }, + { + .ident = "Fish River Island II", + { + DMI_MATCH(DMI_PRODUCT_NAME, "Fish River Island II"), + }, + (void *)FRI2_48_UARTCLK, + }, + { + .ident = "COMe-mTT", + { + DMI_MATCH(DMI_BOARD_NAME, "COMe-mTT"), + }, + (void *)NTC1_UARTCLK, + }, + { + .ident = "nanoETXexpress-TT", + { + DMI_MATCH(DMI_BOARD_NAME, "nanoETXexpress-TT"), + }, + (void *)NTC1_UARTCLK, + }, + { + .ident = "MinnowBoard", + { + DMI_MATCH(DMI_BOARD_NAME, "MinnowBoard"), + }, + (void *)MINNOW_UARTCLK, + }, +}; + +/* Return UART clock, checking for board specific clocks. */ +static unsigned int pch_uart_get_uartclk(void) { - unsigned int msr = ioread8(base + UART_MSR); - priv->dmsr |= msr & PCH_UART_MSR_DELTA; + const struct dmi_system_id *d; + + if (user_uartclk) + return user_uartclk; - return msr; + d = dmi_first_match(pch_uart_dmi_table); + if (d) + return (unsigned long)d->driver_data; + + return DEFAULT_UARTCLK; } static void pch_uart_hal_enable_interrupt(struct eg20t_port *priv, @@ -325,14 +451,14 @@ static void pch_uart_hal_disable_interrupt(struct eg20t_port *priv, iowrite8(ier, priv->membase + UART_IER); } -static int pch_uart_hal_set_line(struct eg20t_port *priv, int baud, +static int pch_uart_hal_set_line(struct eg20t_port *priv, unsigned int baud, unsigned int parity, unsigned int bits, unsigned int stb) { unsigned int dll, dlm, lcr; int div; - div = DIV_ROUND_CLOSEST(priv->base_baud / 16, baud); + div = DIV_ROUND_CLOSEST(priv->uartclk / 16, baud); if (div < 0 || USHRT_MAX <= div) { dev_err(priv->port.dev, "Invalid Baud(div=0x%x)\n", div); return -EINVAL; @@ -360,7 +486,7 @@ static int pch_uart_hal_set_line(struct eg20t_port *priv, int baud, lcr |= bits; lcr |= stb; - dev_dbg(priv->port.dev, "%s:baud = %d, div = %04x, lcr = %02x (%lu)\n", + dev_dbg(priv->port.dev, "%s:baud = %u, div = %04x, lcr = %02x (%lu)\n", __func__, baud, div, lcr, jiffies); iowrite8(PCH_UART_LCR_DLAB, priv->membase + UART_LCR); iowrite8(dll, priv->membase + PCH_UART_DLL); @@ -442,8 +568,9 @@ static int pch_uart_hal_set_fifo(struct eg20t_port *priv, static u8 pch_uart_hal_get_modem(struct eg20t_port *priv) { - priv->dmsr = 0; - return get_msr(priv, priv->membase); + unsigned int msr = ioread8(priv->membase + UART_MSR); + priv->dmsr = msr & PCH_UART_MSR_DELTA; + return (u8)msr; } static void pch_uart_hal_write(struct eg20t_port *priv, @@ -463,25 +590,35 @@ static int pch_uart_hal_read(struct eg20t_port *priv, unsigned char *buf, { int i; u8 rbr, lsr; + struct uart_port *port = &priv->port; lsr = ioread8(priv->membase + UART_LSR); for (i = 0, lsr = ioread8(priv->membase + UART_LSR); - i < rx_size && lsr & UART_LSR_DR; + i < rx_size && lsr & (UART_LSR_DR | UART_LSR_BI); lsr = ioread8(priv->membase + UART_LSR)) { rbr = ioread8(priv->membase + PCH_UART_RBR); + + if (lsr & UART_LSR_BI) { + port->icount.brk++; + if (uart_handle_break(port)) + continue; + } +#ifdef SUPPORT_SYSRQ + if (port->sysrq) { + if (uart_handle_sysrq_char(port, rbr)) + continue; + } +#endif + buf[i++] = rbr; } return i; } -static unsigned int pch_uart_hal_get_iid(struct eg20t_port *priv) +static unsigned char pch_uart_hal_get_iid(struct eg20t_port *priv) { - unsigned int iir; - int ret; - - iir = ioread8(priv->membase + UART_IIR); - ret = (iir & (PCH_UART_IIR_IID | PCH_UART_IIR_TOI | PCH_UART_IIR_IP)); - return ret; + return ioread8(priv->membase + UART_IIR) &\ + (PCH_UART_IIR_IID | PCH_UART_IIR_TOI | PCH_UART_IIR_IP); } static u8 pch_uart_hal_get_line_status(struct eg20t_port *priv) @@ -505,26 +642,18 @@ static void pch_uart_hal_set_break(struct eg20t_port *priv, int on) static int push_rx(struct eg20t_port *priv, const unsigned char *buf, int size) { - struct uart_port *port; - struct tty_struct *tty; - - port = &priv->port; - tty = tty_port_tty_get(&port->state->port); - if (!tty) { - dev_dbg(priv->port.dev, "%s:tty is busy now", __func__); - return -EBUSY; - } + struct uart_port *port = &priv->port; + struct tty_port *tport = &port->state->port; - tty_insert_flip_string(tty, buf, size); - tty_flip_buffer_push(tty); - tty_kref_put(tty); + tty_insert_flip_string(tport, buf, size); + tty_flip_buffer_push(tport); return 0; } static int pop_tx_x(struct eg20t_port *priv, unsigned char *buf) { - int ret; + int ret = 0; struct uart_port *port = &priv->port; if (port->x_char) { @@ -533,8 +662,6 @@ static int pop_tx_x(struct eg20t_port *priv, unsigned char *buf) buf[0] = port->x_char; port->x_char = 0; ret = 1; - } else { - ret = 0; } return ret; @@ -542,29 +669,21 @@ static int pop_tx_x(struct eg20t_port *priv, unsigned char *buf) static int dma_push_rx(struct eg20t_port *priv, int size) { - struct tty_struct *tty; int room; struct uart_port *port = &priv->port; + struct tty_port *tport = &port->state->port; - port = &priv->port; - tty = tty_port_tty_get(&port->state->port); - if (!tty) { - dev_dbg(priv->port.dev, "%s:tty is busy now", __func__); - return 0; - } - - room = tty_buffer_request_room(tty, size); + room = tty_buffer_request_room(tport, size); if (room < size) dev_warn(port->dev, "Rx overrun: dropping %u bytes\n", size - room); if (!room) - return room; + return 0; - tty_insert_flip_string(tty, sg_virt(&priv->sg_rx), size); + tty_insert_flip_string(tport, sg_virt(&priv->sg_rx), size); port->icount.rx += room; - tty_kref_put(tty); return room; } @@ -582,10 +701,13 @@ static void pch_free_dma(struct uart_port *port) dma_release_channel(priv->chan_rx); priv->chan_rx = NULL; } - if (sg_dma_address(&priv->sg_rx)) - dma_free_coherent(port->dev, port->fifosize, - sg_virt(&priv->sg_rx), - sg_dma_address(&priv->sg_rx)); + + if (priv->rx_buf_dma) { + dma_free_coherent(port->dev, port->fifosize, priv->rx_buf_virt, + priv->rx_buf_dma); + priv->rx_buf_virt = NULL; + priv->rx_buf_dma = 0; + } return; } @@ -656,21 +778,15 @@ static void pch_dma_rx_complete(void *arg) { struct eg20t_port *priv = arg; struct uart_port *port = &priv->port; - struct tty_struct *tty = tty_port_tty_get(&port->state->port); int count; - if (!tty) { - dev_dbg(priv->port.dev, "%s:tty is busy now", __func__); - return; - } - dma_sync_sg_for_cpu(port->dev, &priv->sg_rx, 1, DMA_FROM_DEVICE); count = dma_push_rx(priv, priv->trigger_level); if (count) - tty_flip_buffer_push(tty); - tty_kref_put(tty); + tty_flip_buffer_push(&port->state->port); async_tx_ack(priv->desc_rx); - pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_RX_INT); + pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_RX_INT | + PCH_UART_HAL_RX_ERR_INT); } static void pch_dma_tx_complete(void *arg) @@ -725,7 +841,8 @@ static int handle_rx_to(struct eg20t_port *priv) int rx_size; int ret; if (!priv->start_rx) { - pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_RX_INT); + pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_RX_INT | + PCH_UART_HAL_RX_ERR_INT); return 0; } buf = &priv->rxbuf; @@ -763,7 +880,7 @@ static int dma_handle_rx(struct eg20t_port *priv) sg_dma_address(sg) = priv->rx_buf_dma; - desc = priv->chan_rx->device->device_prep_slave_sg(priv->chan_rx, + desc = dmaengine_prep_slave_sg(priv->chan_rx, sg, 1, DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT | DMA_CTRL_ACK); @@ -890,6 +1007,10 @@ static unsigned int dma_handle_tx(struct eg20t_port *priv) priv->tx_dma_use = 1; priv->sg_tx_p = kzalloc(sizeof(struct scatterlist)*num, GFP_ATOMIC); + if (!priv->sg_tx_p) { + dev_err(priv->port.dev, "%s:kzalloc Failed\n", __func__); + return 0; + } sg_init_table(priv->sg_tx_p, num); /* Initialize SG table */ sg = priv->sg_tx_p; @@ -922,7 +1043,7 @@ static unsigned int dma_handle_tx(struct eg20t_port *priv) sg_dma_len(sg) = size; } - desc = priv->chan_tx->device->device_prep_slave_sg(priv->chan_tx, + desc = dmaengine_prep_slave_sg(priv->chan_tx, priv->sg_tx_p, nent, DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT | DMA_CTRL_ACK); if (!desc) { @@ -944,23 +1065,35 @@ static unsigned int dma_handle_tx(struct eg20t_port *priv) static void pch_uart_err_ir(struct eg20t_port *priv, unsigned int lsr) { - u8 fcr = ioread8(priv->membase + UART_FCR); - - /* Reset FIFO */ - fcr |= UART_FCR_CLEAR_RCVR; - iowrite8(fcr, priv->membase + UART_FCR); + struct uart_port *port = &priv->port; + struct tty_struct *tty = tty_port_tty_get(&port->state->port); + char *error_msg[5] = {}; + int i = 0; if (lsr & PCH_UART_LSR_ERR) - dev_err(&priv->pdev->dev, "Error data in FIFO\n"); + error_msg[i++] = "Error data in FIFO\n"; - if (lsr & UART_LSR_FE) - dev_err(&priv->pdev->dev, "Framing Error\n"); + if (lsr & UART_LSR_FE) { + port->icount.frame++; + error_msg[i++] = " Framing Error\n"; + } - if (lsr & UART_LSR_PE) - dev_err(&priv->pdev->dev, "Parity Error\n"); + if (lsr & UART_LSR_PE) { + port->icount.parity++; + error_msg[i++] = " Parity Error\n"; + } + + if (lsr & UART_LSR_OE) { + port->icount.overrun++; + error_msg[i++] = " Overrun Error\n"; + } - if (lsr & UART_LSR_OE) - dev_err(&priv->pdev->dev, "Overrun Error\n"); + if (tty == NULL) { + for (i = 0; error_msg[i] != NULL; i++) + dev_err(&priv->pdev->dev, error_msg[i]); + } else { + tty_kref_put(tty); + } } static irqreturn_t pch_uart_interrupt(int irq, void *dev_id) @@ -969,12 +1102,17 @@ static irqreturn_t pch_uart_interrupt(int irq, void *dev_id) unsigned int handled; u8 lsr; int ret = 0; - unsigned int iid; + unsigned char iid; unsigned long flags; + int next = 1; + u8 msr; - spin_lock_irqsave(&priv->port.lock, flags); + spin_lock_irqsave(&priv->lock, flags); handled = 0; - while ((iid = pch_uart_hal_get_iid(priv)) > 1) { + while (next) { + iid = pch_uart_hal_get_iid(priv); + if (iid & PCH_UART_IIR_IP) /* No Interrupt */ + break; switch (iid) { case PCH_UART_IID_RLS: /* Receiver Line Status */ lsr = pch_uart_hal_get_line_status(priv); @@ -982,16 +1120,20 @@ static irqreturn_t pch_uart_interrupt(int irq, void *dev_id) UART_LSR_PE | UART_LSR_OE)) { pch_uart_err_ir(priv, lsr); ret = PCH_UART_HANDLED_RX_ERR_INT; + } else { + ret = PCH_UART_HANDLED_LS_INT; } break; case PCH_UART_IID_RDR: /* Received Data Ready */ if (priv->use_dma) { pch_uart_hal_disable_interrupt(priv, - PCH_UART_HAL_RX_INT); + PCH_UART_HAL_RX_INT | + PCH_UART_HAL_RX_ERR_INT); ret = dma_handle_rx(priv); if (!ret) pch_uart_hal_enable_interrupt(priv, - PCH_UART_HAL_RX_INT); + PCH_UART_HAL_RX_INT | + PCH_UART_HAL_RX_ERR_INT); } else { ret = handle_rx(priv); } @@ -1008,22 +1150,24 @@ static irqreturn_t pch_uart_interrupt(int irq, void *dev_id) ret = handle_tx(priv); break; case PCH_UART_IID_MS: /* Modem Status */ - ret = PCH_UART_HANDLED_MS_INT; + msr = pch_uart_hal_get_modem(priv); + next = 0; /* MS ir prioirty is the lowest. So, MS ir + means final interrupt */ + if ((msr & UART_MSR_ANY_DELTA) == 0) + break; + ret |= PCH_UART_HANDLED_MS_INT; break; default: /* Never junp to this label */ - dev_err(priv->port.dev, "%s:iid=%d (%lu)\n", __func__, + dev_err(priv->port.dev, "%s:iid=%02x (%lu)\n", __func__, iid, jiffies); ret = -1; + next = 0; break; } handled |= (unsigned int)ret; } - if (handled == 0 && iid <= 1) { - if (priv->int_dis_flag) - priv->int_dis_flag = 0; - } - spin_unlock_irqrestore(&priv->port.lock, flags); + spin_unlock_irqrestore(&priv->lock, flags); return IRQ_RETVAL(handled); } @@ -1032,14 +1176,12 @@ static irqreturn_t pch_uart_interrupt(int irq, void *dev_id) static unsigned int pch_uart_tx_empty(struct uart_port *port) { struct eg20t_port *priv; - int ret; + priv = container_of(port, struct eg20t_port, port); if (priv->tx_empty) - ret = TIOCSER_TEMT; + return TIOCSER_TEMT; else - ret = 0; - - return ret; + return 0; } /* Returns the current state of modem control inputs. */ @@ -1117,8 +1259,8 @@ static void pch_uart_stop_rx(struct uart_port *port) struct eg20t_port *priv; priv = container_of(port, struct eg20t_port, port); priv->start_rx = 0; - pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_RX_INT); - priv->int_dis_flag = 1; + pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_RX_INT | + PCH_UART_HAL_RX_ERR_INT); } /* Enable the modem status interrupts. */ @@ -1136,9 +1278,9 @@ static void pch_uart_break_ctl(struct uart_port *port, int ctl) unsigned long flags; priv = container_of(port, struct eg20t_port, port); - spin_lock_irqsave(&port->lock, flags); + spin_lock_irqsave(&priv->lock, flags); pch_uart_hal_set_break(priv, ctl); - spin_unlock_irqrestore(&port->lock, flags); + spin_unlock_irqrestore(&priv->lock, flags); } /* Grab any interrupt resources and initialise any low level driver state. */ @@ -1153,9 +1295,9 @@ static int pch_uart_startup(struct uart_port *port) priv->tx_empty = 1; if (port->uartclk) - priv->base_baud = port->uartclk; + priv->uartclk = port->uartclk; else - port->uartclk = priv->base_baud; + port->uartclk = priv->uartclk; pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_ALL_INT); ret = pch_uart_hal_set_line(priv, default_baud, @@ -1173,6 +1315,7 @@ static int pch_uart_startup(struct uart_port *port) break; case 16: fifo_size = PCH_UART_HAL_FIFO16; + break; case 1: default: fifo_size = PCH_UART_HAL_FIFO_DIS; @@ -1202,7 +1345,7 @@ static int pch_uart_startup(struct uart_port *port) return ret; ret = request_irq(priv->port.irq, pch_uart_interrupt, IRQF_SHARED, - KBUILD_MODNAME, priv); + priv->irq_name, priv); if (ret < 0) return ret; @@ -1210,7 +1353,8 @@ static int pch_uart_startup(struct uart_port *port) pch_request_dma(port); priv->start_rx = 1; - pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_RX_INT); + pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_RX_INT | + PCH_UART_HAL_RX_ERR_INT); uart_update_timeout(port, CS8, default_baud); return 0; @@ -1241,9 +1385,8 @@ static void pch_uart_shutdown(struct uart_port *port) static void pch_uart_set_termios(struct uart_port *port, struct ktermios *termios, struct ktermios *old) { - int baud; int rtn; - unsigned int parity, bits, stb; + unsigned int baud, parity, bits, stb; struct eg20t_port *priv; unsigned long flags; @@ -1268,14 +1411,13 @@ static void pch_uart_set_termios(struct uart_port *port, stb = PCH_UART_HAL_STB1; if (termios->c_cflag & PARENB) { - if (!(termios->c_cflag & PARODD)) + if (termios->c_cflag & PARODD) parity = PCH_UART_HAL_PARITY_ODD; else parity = PCH_UART_HAL_PARITY_EVEN; - } else { + } else parity = PCH_UART_HAL_PARITY_NONE; - } /* Only UART0 has auto hardware flow function */ if ((termios->c_cflag & CRTSCTS) && (priv->fifo_size == 256)) @@ -1287,7 +1429,8 @@ static void pch_uart_set_termios(struct uart_port *port, baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk / 16); - spin_lock_irqsave(&port->lock, flags); + spin_lock_irqsave(&priv->lock, flags); + spin_lock(&port->lock); uart_update_timeout(port, termios->c_cflag, baud); rtn = pch_uart_hal_set_line(priv, baud, parity, bits, stb); @@ -1300,7 +1443,8 @@ static void pch_uart_set_termios(struct uart_port *port, tty_termios_encode_baud_rate(termios, baud, baud); out: - spin_unlock_irqrestore(&port->lock, flags); + spin_unlock(&port->lock); + spin_unlock_irqrestore(&priv->lock, flags); } static const char *pch_uart_type(struct uart_port *port) @@ -1366,37 +1510,20 @@ static int pch_uart_verify_port(struct uart_port *port, __func__); return -EOPNOTSUPP; #endif - priv->use_dma = 1; - priv->use_dma_flag = 1; - dev_info(priv->port.dev, "PCH UART : Use DMA Mode\n"); + if (!priv->use_dma) { + pch_request_dma(port); + if (priv->chan_rx) + priv->use_dma = 1; + } + dev_info(priv->port.dev, "PCH UART: %s\n", + priv->use_dma ? + "Use DMA Mode" : "No DMA"); } return 0; } -static struct uart_ops pch_uart_ops = { - .tx_empty = pch_uart_tx_empty, - .set_mctrl = pch_uart_set_mctrl, - .get_mctrl = pch_uart_get_mctrl, - .stop_tx = pch_uart_stop_tx, - .start_tx = pch_uart_start_tx, - .stop_rx = pch_uart_stop_rx, - .enable_ms = pch_uart_enable_ms, - .break_ctl = pch_uart_break_ctl, - .startup = pch_uart_startup, - .shutdown = pch_uart_shutdown, - .set_termios = pch_uart_set_termios, -/* .pm = pch_uart_pm, Not supported yet */ -/* .set_wake = pch_uart_set_wake, Not supported yet */ - .type = pch_uart_type, - .release_port = pch_uart_release_port, - .request_port = pch_uart_request_port, - .config_port = pch_uart_config_port, - .verify_port = pch_uart_verify_port -}; - -#ifdef CONFIG_SERIAL_PCH_UART_CONSOLE - +#if defined(CONFIG_CONSOLE_POLL) || defined(CONFIG_SERIAL_PCH_UART_CONSOLE) /* * Wait for transmitter & holding register to empty */ @@ -1427,6 +1554,79 @@ static void wait_for_xmitr(struct eg20t_port *up, int bits) } } } +#endif /* CONFIG_CONSOLE_POLL || CONFIG_SERIAL_PCH_UART_CONSOLE */ + +#ifdef CONFIG_CONSOLE_POLL +/* + * Console polling routines for communicate via uart while + * in an interrupt or debug context. + */ +static int pch_uart_get_poll_char(struct uart_port *port) +{ + struct eg20t_port *priv = + container_of(port, struct eg20t_port, port); + u8 lsr = ioread8(priv->membase + UART_LSR); + + if (!(lsr & UART_LSR_DR)) + return NO_POLL_CHAR; + + return ioread8(priv->membase + PCH_UART_RBR); +} + + +static void pch_uart_put_poll_char(struct uart_port *port, + unsigned char c) +{ + unsigned int ier; + struct eg20t_port *priv = + container_of(port, struct eg20t_port, port); + + /* + * First save the IER then disable the interrupts + */ + ier = ioread8(priv->membase + UART_IER); + pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_ALL_INT); + + wait_for_xmitr(priv, UART_LSR_THRE); + /* + * Send the character out. + */ + iowrite8(c, priv->membase + PCH_UART_THR); + + /* + * Finally, wait for transmitter to become empty + * and restore the IER + */ + wait_for_xmitr(priv, BOTH_EMPTY); + iowrite8(ier, priv->membase + UART_IER); +} +#endif /* CONFIG_CONSOLE_POLL */ + +static struct uart_ops pch_uart_ops = { + .tx_empty = pch_uart_tx_empty, + .set_mctrl = pch_uart_set_mctrl, + .get_mctrl = pch_uart_get_mctrl, + .stop_tx = pch_uart_stop_tx, + .start_tx = pch_uart_start_tx, + .stop_rx = pch_uart_stop_rx, + .enable_ms = pch_uart_enable_ms, + .break_ctl = pch_uart_break_ctl, + .startup = pch_uart_startup, + .shutdown = pch_uart_shutdown, + .set_termios = pch_uart_set_termios, +/* .pm = pch_uart_pm, Not supported yet */ + .type = pch_uart_type, + .release_port = pch_uart_release_port, + .request_port = pch_uart_request_port, + .config_port = pch_uart_config_port, + .verify_port = pch_uart_verify_port, +#ifdef CONFIG_CONSOLE_POLL + .poll_get_char = pch_uart_get_poll_char, + .poll_put_char = pch_uart_put_poll_char, +#endif +}; + +#ifdef CONFIG_SERIAL_PCH_UART_CONSOLE static void pch_console_putchar(struct uart_port *port, int ch) { @@ -1447,10 +1647,10 @@ static void pch_console_write(struct console *co, const char *s, unsigned int count) { struct eg20t_port *priv; - unsigned long flags; + int priv_locked = 1; + int port_locked = 1; u8 ier; - int locked = 1; priv = pch_uart_ports[co->index]; @@ -1458,12 +1658,17 @@ pch_console_write(struct console *co, const char *s, unsigned int count) local_irq_save(flags); if (priv->port.sysrq) { - /* serial8250_handle_port() already took the lock */ - locked = 0; + /* call to uart_handle_sysrq_char already took the priv lock */ + priv_locked = 0; + /* serial8250_handle_port() already took the port lock */ + port_locked = 0; } else if (oops_in_progress) { - locked = spin_trylock(&priv->port.lock); - } else + priv_locked = spin_trylock(&priv->lock); + port_locked = spin_trylock(&priv->port.lock); + } else { + spin_lock(&priv->lock); spin_lock(&priv->port.lock); + } /* * First save the IER then disable the interrupts @@ -1481,15 +1686,17 @@ pch_console_write(struct console *co, const char *s, unsigned int count) wait_for_xmitr(priv, BOTH_EMPTY); iowrite8(ier, priv->membase + UART_IER); - if (locked) + if (port_locked) spin_unlock(&priv->port.lock); + if (priv_locked) + spin_unlock(&priv->lock); local_irq_restore(flags); } static int __init pch_console_setup(struct console *co, char *options) { struct uart_port *port; - int baud = 9600; + int baud = default_baud; int bits = 8; int parity = 'n'; int flow = 'n'; @@ -1506,8 +1713,7 @@ static int __init pch_console_setup(struct console *co, char *options) if (!port || (!port->iobase && !port->membase)) return -ENODEV; - /* setup uartclock */ - port->uartclk = DEFAULT_BAUD_RATE; + port->uartclk = pch_uart_get_uartclk(); if (options) uart_parse_options(options, &baud, &parity, &bits, &flow); @@ -1530,7 +1736,7 @@ static struct console pch_console = { #define PCH_CONSOLE (&pch_console) #else #define PCH_CONSOLE NULL -#endif +#endif /* CONFIG_SERIAL_PCH_UART_CONSOLE */ static struct uart_driver pch_uart_driver = { .owner = THIS_MODULE, @@ -1550,10 +1756,12 @@ static struct eg20t_port *pch_uart_init_port(struct pci_dev *pdev, unsigned int iobase; unsigned int mapbase; unsigned char *rxbuf; - int fifosize, base_baud; + int fifosize; int port_type; struct pch_uart_driver_data *board; - const char *board_name; +#ifdef CONFIG_DEBUG_FS + char name[32]; /* for debugfs file name */ +#endif board = &drv_dat[id->driver_data]; port_type = board->port_type; @@ -1566,13 +1774,6 @@ static struct eg20t_port *pch_uart_init_port(struct pci_dev *pdev, if (!rxbuf) goto init_port_free_txbuf; - base_baud = DEFAULT_BAUD_RATE; - - /* quirk for CM-iTC board */ - board_name = dmi_get_system_info(DMI_BOARD_NAME); - if (board_name && strstr(board_name, "CM-iTC")) - base_baud = 192000000; /* 192.0MHz */ - switch (port_type) { case PORT_UNKNOWN: fifosize = 256; /* EG20T/ML7213: UART0 */ @@ -1586,6 +1787,9 @@ static struct eg20t_port *pch_uart_init_port(struct pci_dev *pdev, } pci_enable_msi(pdev); + pci_set_master(pdev); + + spin_lock_init(&priv->lock); iobase = pci_resource_start(pdev, 0); mapbase = pci_resource_start(pdev, 1); @@ -1597,7 +1801,7 @@ static struct eg20t_port *pch_uart_init_port(struct pci_dev *pdev, priv->rxbuf.size = PAGE_SIZE; priv->fifo_size = fifosize; - priv->base_baud = base_baud; + priv->uartclk = pch_uart_get_uartclk(); priv->port_type = PORT_MAX_8250 + port_type + 1; priv->port.dev = &pdev->dev; priv->port.iobase = iobase; @@ -1611,10 +1815,15 @@ static struct eg20t_port *pch_uart_init_port(struct pci_dev *pdev, priv->port.line = board->line_no; priv->trigger = PCH_UART_HAL_TRIGGER_M; + snprintf(priv->irq_name, IRQ_NAME_SIZE, + KBUILD_MODNAME ":" PCH_UART_DRIVER_DEVICE "%d", + priv->port.line); + spin_lock_init(&priv->port.lock); pci_set_drvdata(pdev, priv); - pch_uart_hal_request(pdev, fifosize, base_baud); + priv->trigger_level = 1; + priv->fcr = 0; #ifdef CONFIG_SERIAL_PCH_UART_CONSOLE pch_uart_ports[board->line_no] = priv; @@ -1623,6 +1832,12 @@ static struct eg20t_port *pch_uart_init_port(struct pci_dev *pdev, if (ret < 0) goto init_port_hal_free; +#ifdef CONFIG_DEBUG_FS + snprintf(name, sizeof(name), "uart%d_regs", board->line_no); + priv->debugfs = debugfs_create_file(name, S_IFREG | S_IRUGO, + NULL, priv, &port_regs_ops); +#endif + return priv; init_port_hal_free: @@ -1639,16 +1854,18 @@ init_port_alloc_err: static void pch_uart_exit_port(struct eg20t_port *priv) { + +#ifdef CONFIG_DEBUG_FS + if (priv->debugfs) + debugfs_remove(priv->debugfs); +#endif uart_remove_one_port(&pch_uart_driver, &priv->port); - pci_set_drvdata(priv->pdev, NULL); free_page((unsigned long)priv->rxbuf.buf); } static void pch_uart_pci_remove(struct pci_dev *pdev) { - struct eg20t_port *priv; - - priv = (struct eg20t_port *)pci_get_drvdata(pdev); + struct eg20t_port *priv = pci_get_drvdata(pdev); pci_disable_msi(pdev); @@ -1696,7 +1913,7 @@ static int pch_uart_pci_resume(struct pci_dev *pdev) #define pch_uart_pci_resume NULL #endif -static DEFINE_PCI_DEVICE_TABLE(pch_uart_pci_id) = { +static const struct pci_device_id pch_uart_pci_id[] = { {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8811), .driver_data = pch_et20t_uart0}, {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8812), @@ -1722,7 +1939,7 @@ static DEFINE_PCI_DEVICE_TABLE(pch_uart_pci_id) = { {0,}, }; -static int __devinit pch_uart_pci_probe(struct pci_dev *pdev, +static int pch_uart_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) { int ret; @@ -1752,7 +1969,7 @@ static struct pci_driver pch_uart_pci_driver = { .name = "pch_uart", .id_table = pch_uart_pci_id, .probe = pch_uart_pci_probe, - .remove = __devexit_p(pch_uart_pci_remove), + .remove = pch_uart_pci_remove, .suspend = pch_uart_pci_suspend, .resume = pch_uart_pci_resume, }; @@ -1784,4 +2001,11 @@ module_exit(pch_uart_module_exit); MODULE_LICENSE("GPL v2"); MODULE_DESCRIPTION("Intel EG20T PCH UART PCI Driver"); +MODULE_DEVICE_TABLE(pci, pch_uart_pci_id); + module_param(default_baud, uint, S_IRUGO); +MODULE_PARM_DESC(default_baud, + "Default BAUD for initial driver state and console (default 9600)"); +module_param(user_uartclk, uint, S_IRUGO); +MODULE_PARM_DESC(user_uartclk, + "Override UART default or board specific UART clock"); |