serial: pl011: implement workaround for CTS clear event issue

Problem Observed:
- interrupt status is set by rising or falling edge on CTS line
- interrupt status is cleared on a .0. to .1. transition of the
  interrupt-clear register bit 1.
- interrupt-clear register is reset by hardware once the interrupt
  status is .0..
  Remark: It seems not possible to read this register back by the
  CPU though, but internally this register exists.
- when simultaneous set and reset event on the interrupt status
  happens, then the set-event has priority and the status remains
  .1.. As a result the interrupt-clear register is not reset to
  .0., and no new .0. to .1. transition can be detected on it when
  writing a .1. to it.
  This implies race condition, the clear must be performed at least
  one UARTCLK the riding edge of CTS RIS interrupt.

Fix:
  Instead of resetting UART as done in commit
  c16d51a32bbb61ac8fd96f78b5ce2fccfe0fb4c3
  "amba pl011: workaround for uart registers lockup" do the
  following:

  write .0. and then  .1. to the interrupt-clear register to make
  sure that this transition is detected. According to the datasheet
  writing a .0. does not have any effect, but actually it allows to
  reset the internal interrupt-clear register.

  Take into account:
  The .0. needs to last at least for one clk_uart clock period
  (~ 38 MHz, 26.08ns)

This way we can do away with the tasklet and keep only a tiny
fix triggered by the variant flag introduced in this patch.

Signed-off-by: Guillaume Jaunet <guillaume.jaunet@stericsson.com>
Signed-off-by: Christophe Arnal <christophe.arnal@stericsson.com>
Signed-off-by: Matthias Locher  <Matthias.Locher@stericsson.com>
Signed-off-by: Rajanikanth H.V <rajanikanth.hv@stericsson.com>
Reviewed-by: Srinidhi Kasagar <srinidhi.kasagar@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 18 insertions, 91 deletions

diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
index 0c65c9e66986..aee85238ccfc 100644
--- a/drivers/tty/serial/amba-pl011.c
+++ b/drivers/tty/serial/amba-pl011.c
@@ -67,30 +67,6 @@
 #define UART_DR_ERROR           (UART011_DR_OE|UART011_DR_BE|UART011_DR_PE|UART011_DR_FE)
 #define UART_DUMMY_DR_RX        (1 << 16)
 
-
-#define UART_WA_SAVE_NR 14
-
-static void pl011_lockup_wa(unsigned long data);
-static const u32 uart_wa_reg[UART_WA_SAVE_NR] = {
-        ST_UART011_DMAWM,
-        ST_UART011_TIMEOUT,
-        ST_UART011_LCRH_RX,
-        UART011_IBRD,
-        UART011_FBRD,
-        ST_UART011_LCRH_TX,
-        UART011_IFLS,
-        ST_UART011_XFCR,
-        ST_UART011_XON1,
-        ST_UART011_XON2,
-        ST_UART011_XOFF1,
-        ST_UART011_XOFF2,
-        UART011_CR,
-        UART011_IMSC
-};
-
-static u32 uart_wa_regdata[UART_WA_SAVE_NR];
-static DECLARE_TASKLET(pl011_lockup_tlet, pl011_lockup_wa, 0);
-
 /* There is by now at least one vendor with differing details, so handle it */
 struct vendor_data {
         unsigned int            ifls;
@@ -100,6 +76,7 @@ struct vendor_data {
         bool                    oversampling;
         bool                    interrupt_may_hang;   /* vendor-specific */
         bool                    dma_threshold;
+        bool                    cts_event_workaround;
 };
 
 static struct vendor_data vendor_arm = {
@@ -109,6 +86,7 @@ static struct vendor_data vendor_arm = {
         .lcrh_rx                = UART011_LCRH,
         .oversampling           = false,
         .dma_threshold          = false,
+        .cts_event_workaround   = false,
 };
 
 static struct vendor_data vendor_st = {
@@ -119,6 +97,7 @@ static struct vendor_data vendor_st = {
         .oversampling           = true,
         .interrupt_may_hang     = true,
         .dma_threshold          = true,
+        .cts_event_workaround   = true,
 };
 
 static struct uart_amba_port *amba_ports[UART_NR];
@@ -1054,69 +1033,6 @@ static inline bool pl011_dma_rx_running(struct uart_amba_port *uap)
 #define pl011_dma_flush_buffer  NULL
 #endif
 
-
-/*
- * pl011_lockup_wa
- * This workaround aims to break the deadlock situation
- * when after long transfer over uart in hardware flow
- * control, uart interrupt registers cannot be cleared.
- * Hence uart transfer gets blocked.
- *
- * It is seen that during such deadlock condition ICR
- * don't get cleared even on multiple write. This leads
- * pass_counter to decrease and finally reach zero. This
- * can be taken as trigger point to run this UART_BT_WA.
- *
- */
-static void pl011_lockup_wa(unsigned long data)
-{
-        struct uart_amba_port *uap = amba_ports[0];
-        void __iomem *base = uap->port.membase;
-        struct circ_buf *xmit = &uap->port.state->xmit;
-        struct tty_struct *tty = uap->port.state->port.tty;
-        int buf_empty_retries = 200;
-        int loop;
-
-        /* Stop HCI layer from submitting data for tx */
-        tty->hw_stopped = 1;
-        while (!uart_circ_empty(xmit)) {
-                if (buf_empty_retries-- == 0)
-                        break;
-                udelay(100);
-        }
-
-        /* Backup registers */
-        for (loop = 0; loop < UART_WA_SAVE_NR; loop++)
-                uart_wa_regdata[loop] = readl(base + uart_wa_reg[loop]);
-
-        /* Disable UART so that FIFO data is flushed out */
-        writew(0x00, uap->port.membase + UART011_CR);
-
-        /* Soft reset UART module */
-        if (uap->port.dev->platform_data) {
-                struct amba_pl011_data *plat;
-
-                plat = uap->port.dev->platform_data;
-                if (plat->reset)
-                        plat->reset();
-        }
-
-        /* Restore registers */
-        for (loop = 0; loop < UART_WA_SAVE_NR; loop++)
-                writew(uart_wa_regdata[loop] ,
-                                uap->port.membase + uart_wa_reg[loop]);
-
-        /* Initialise the old status of the modem signals */
-        uap->old_status = readw(uap->port.membase + UART01x_FR) &
-                UART01x_FR_MODEM_ANY;
-
-        if (readl(base + UART011_MIS) & 0x2)
-                printk(KERN_EMERG "UART_BT_WA: ***FAILED***\n");
-
-        /* Start Tx/Rx */
-        tty->hw_stopped = 0;
-}
-
 static void pl011_stop_tx(struct uart_port *port)
 {
         struct uart_amba_port *uap = (struct uart_amba_port *)port;
@@ -1245,12 +1161,26 @@ static irqreturn_t pl011_int(int irq, void *dev_id)
         unsigned long flags;
         unsigned int status, pass_counter = AMBA_ISR_PASS_LIMIT;
         int handled = 0;
+        unsigned int dummy_read;
 
         spin_lock_irqsave(&uap->port.lock, flags);
 
         status = readw(uap->port.membase + UART011_MIS);
         if (status) {
                 do {
+                        if (uap->vendor->cts_event_workaround) {
+                                /* workaround to make sure that all bits are unlocked.. */
+                                writew(0x00, uap->port.membase + UART011_ICR);
+
+                                /*
+                                 * WA: introduce 26ns(1 uart clk) delay before W1C;
+                                 * single apb access will incur 2 pclk(133.12Mhz) delay,
+                                 * so add 2 dummy reads
+                                 */
+                                dummy_read = readw(uap->port.membase + UART011_ICR);
+                                dummy_read = readw(uap->port.membase + UART011_ICR);
+                        }
+
                         writew(status & ~(UART011_TXIS|UART011_RTIS|
                                           UART011_RXIS),
                                uap->port.membase + UART011_ICR);
@@ -1267,11 +1197,8 @@ static irqreturn_t pl011_int(int irq, void *dev_id)
                         if (status & UART011_TXIS)
                                 pl011_tx_chars(uap);
 
-                        if (pass_counter-- == 0) {
-                                if (uap->interrupt_may_hang)
-                                        tasklet_schedule(&pl011_lockup_tlet);
+                        if (pass_counter-- == 0)
                                 break;
-                        }
 
                         status = readw(uap->port.membase + UART011_MIS);
                 } while (status != 0);