2015-09-18 21:59 GMT+08:00 Russell King - ARM Linux <linux@xxxxxxxxxxxxxxxx>:
> I guess I need to pick up maintanence of this driver again and stop it
> turning into the stinking pile of dogpoo that people are trying to make
> it... I don't have time this week to do that, nor next week though.
>
Welcome back to maintain this driver and your comments on CODE is also welcome.
Jun
> On Fri, Sep 18, 2015 at 02:50:26PM +0100, Andre Przywara wrote:
>> Hi Jun,
>>
>> On 31/07/15 08:49, Jun Nie wrote:
>> > Support ZTE uart with some registers differing offset.
>> > Probe as platform device for not AMBA IP ID is
>> > available on ZTE uart.
>> >
>> > Signed-off-by: Jun Nie <jun.nie@xxxxxxxxxx>
>> > ---
>> > drivers/tty/serial/Kconfig | 4 +-
>> > drivers/tty/serial/amba-pl011.c | 195 +++++++++++++++++++++++++++++++++++++---
>> > include/linux/amba/serial.h | 14 +++
>> > 3 files changed, 197 insertions(+), 16 deletions(-)
>> >
>> > diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
>> > index 15b4079..2103765 100644
>> > --- a/drivers/tty/serial/Kconfig
>> > +++ b/drivers/tty/serial/Kconfig
>> > @@ -47,12 +47,12 @@ config SERIAL_AMBA_PL010_CONSOLE
>> >
>> > config SERIAL_AMBA_PL011
>> > tristate "ARM AMBA PL011 serial port support"
>> > - depends on ARM_AMBA
>> > + depends on ARM_AMBA || SOC_ZX296702
>> > select SERIAL_CORE
>> > help
>> > This selects the ARM(R) AMBA(R) PrimeCell PL011 UART. If you have
>> > an Integrator/PP2, Integrator/CP or Versatile platform, say Y or M
>> > - here.
>> > + here. Say Y or M if you have SOC_ZX296702.
>> >
>> > If unsure, say N.
>> >
>> > diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
>> > index 017443d..2af09ab 100644
>> > --- a/drivers/tty/serial/amba-pl011.c
>> > +++ b/drivers/tty/serial/amba-pl011.c
>> > @@ -74,6 +74,10 @@
>> > /* There is by now at least one vendor with differing details, so handle it */
>> > struct vendor_data {
>> > unsigned int ifls;
>> > + unsigned int fr_busy;
>> > + unsigned int fr_dsr;
>> > + unsigned int fr_cts;
>> > + unsigned int fr_ri;
>> > unsigned int lcrh_tx;
>> > unsigned int lcrh_rx;
>> > u16 *reg_lut;
>> > @@ -127,6 +131,7 @@ static u16 arm_reg[] = {
>> > [REG_DMACR] = UART011_DMACR,
>> > };
>> >
>> > +#ifdef CONFIG_ARM_AMBA
>>
>> Maybe I missed that discussion (reading mailing list archives on the web
>> is just horrible!), but why do we have all these #ifdefs here?
>> The actual design of that driver extension is meant to fold well into
>> the driver, with the changes only coming into effect if the DT node is
>> found. To me it looks like we could even have a PL011 instance and a ZTE
>> UART instance in operation at the same time.
>>
>> So can't we get rid of those silly #ifdef CONFIG_ARM_AMBAs at least, and
>> CONFIG_SOC_ZX296702 as well?
>>
>> > static unsigned int get_fifosize_arm(struct amba_device *dev)
>> > {
>> > return amba_rev(dev) < 3 ? 16 : 32;
>> > @@ -134,6 +139,10 @@ static unsigned int get_fifosize_arm(struct amba_device *dev)
>> >
>> > static struct vendor_data vendor_arm = {
>> > .ifls = UART011_IFLS_RX4_8|UART011_IFLS_TX4_8,
>> > + .fr_busy = UART01x_FR_BUSY,
>> > + .fr_dsr = UART01x_FR_DSR,
>> > + .fr_cts = UART01x_FR_CTS,
>> > + .fr_ri = UART011_FR_RI,
>> > .lcrh_tx = REG_LCRH,
>> > .lcrh_rx = REG_LCRH,
>> > .reg_lut = arm_reg,
>> > @@ -144,8 +153,13 @@ static struct vendor_data vendor_arm = {
>> > .fixed_options = false,
>> > .get_fifosize = get_fifosize_arm,
>> > };
>> > +#endif
>> >
>> > static struct vendor_data vendor_sbsa = {
>> > + .fr_busy = UART01x_FR_BUSY,
>> > + .fr_dsr = UART01x_FR_DSR,
>> > + .fr_cts = UART01x_FR_CTS,
>> > + .fr_ri = UART011_FR_RI,
>> > .reg_lut = arm_reg,
>> > .oversampling = false,
>> > .dma_threshold = false,
>> > @@ -154,6 +168,7 @@ static struct vendor_data vendor_sbsa = {
>> > .fixed_options = true,
>> > };
>> >
>> > +#ifdef CONFIG_ARM_AMBA
>> > static u16 st_reg[] = {
>> > [REG_DR] = UART01x_DR,
>> > [REG_RSR] = UART01x_RSR,
>> > @@ -180,6 +195,10 @@ static unsigned int get_fifosize_st(struct amba_device *dev)
>> >
>> > static struct vendor_data vendor_st = {
>> > .ifls = UART011_IFLS_RX_HALF|UART011_IFLS_TX_HALF,
>> > + .fr_busy = UART01x_FR_BUSY,
>> > + .fr_dsr = UART01x_FR_DSR,
>> > + .fr_cts = UART01x_FR_CTS,
>> > + .fr_ri = UART011_FR_RI,
>> > .lcrh_tx = REG_LCRH,
>> > .lcrh_rx = REG_ST_LCRH_RX,
>> > .reg_lut = st_reg,
>> > @@ -190,6 +209,43 @@ static struct vendor_data vendor_st = {
>> > .fixed_options = false,
>> > .get_fifosize = get_fifosize_st,
>> > };
>> > +#endif
>> > +
>> > +#ifdef CONFIG_SOC_ZX296702
>>
>> As said above, I doubt the usefulness of this bracketing.
>> But even if there are arguments in favour for that, shouldn't it be
>> CONFIG_ARCH_ZX instead? Or is this UART just a mishap which happened to
>> that very particular SoC and it will not show again in any other
>> silicon?
>>
>> Cheers,
>> Andre.
>>
>> > +static u16 zte_reg[] = {
>> > + [REG_DR] = ZX_UART01x_DR,
>> > + [REG_RSR] = UART01x_RSR,
>> > + [REG_ST_DMAWM] = ST_UART011_DMAWM,
>> > + [REG_FR] = ZX_UART01x_FR,
>> > + [REG_ST_LCRH_RX] = ST_UART011_LCRH_RX,
>> > + [REG_ILPR] = UART01x_ILPR,
>> > + [REG_IBRD] = UART011_IBRD,
>> > + [REG_FBRD] = UART011_FBRD,
>> > + [REG_LCRH] = ZX_UART011_LCRH_TX,
>> > + [REG_CR] = ZX_UART011_CR,
>> > + [REG_IFLS] = ZX_UART011_IFLS,
>> > + [REG_IMSC] = ZX_UART011_IMSC,
>> > + [REG_RIS] = ZX_UART011_RIS,
>> > + [REG_MIS] = ZX_UART011_MIS,
>> > + [REG_ICR] = ZX_UART011_ICR,
>> > + [REG_DMACR] = ZX_UART011_DMACR,
>> > +};
>> > +
>> > +static struct vendor_data vendor_zte = {
>> > + .ifls = UART011_IFLS_RX4_8|UART011_IFLS_TX4_8,
>> > + .fr_busy = ZX_UART01x_FR_BUSY,
>> > + .fr_dsr = ZX_UART01x_FR_DSR,
>> > + .fr_cts = ZX_UART01x_FR_CTS,
>> > + .fr_ri = ZX_UART011_FR_RI,
>> > + .lcrh_tx = REG_LCRH,
>> > + .lcrh_rx = REG_ST_LCRH_RX,
>> > + .reg_lut = zte_reg,
>> > + .oversampling = false,
>> > + .dma_threshold = false,
>> > + .cts_event_workaround = false,
>> > + .fixed_options = false,
>> > +};
>> > +#endif
>> >
>> > /* Deals with DMA transactions */
>> >
>> > @@ -233,6 +289,10 @@ struct uart_amba_port {
>> > unsigned int im; /* interrupt mask */
>> > unsigned int old_status;
>> > unsigned int fifosize; /* vendor-specific */
>> > + unsigned int fr_busy; /* vendor-specific */
>> > + unsigned int fr_dsr; /* vendor-specific */
>> > + unsigned int fr_cts; /* vendor-specific */
>> > + unsigned int fr_ri; /* vendor-specific */
>> > unsigned int lcrh_tx; /* vendor-specific */
>> > unsigned int lcrh_rx; /* vendor-specific */
>> > unsigned int old_cr; /* state during shutdown */
>> > @@ -1163,7 +1223,7 @@ static void pl011_dma_shutdown(struct uart_amba_port *uap)
>> > return;
>> >
>> > /* Disable RX and TX DMA */
>> > - while (pl011_readw(uap, REG_FR) & UART01x_FR_BUSY)
>> > + while (pl011_readw(uap, REG_FR) & uap->fr_busy)
>> > barrier();
>> >
>> > spin_lock_irq(&uap->port.lock);
>> > @@ -1412,11 +1472,11 @@ static void pl011_modem_status(struct uart_amba_port *uap)
>> > if (delta & UART01x_FR_DCD)
>> > uart_handle_dcd_change(&uap->port, status & UART01x_FR_DCD);
>> >
>> > - if (delta & UART01x_FR_DSR)
>> > + if (delta & uap->fr_dsr)
>> > uap->port.icount.dsr++;
>> >
>> > - if (delta & UART01x_FR_CTS)
>> > - uart_handle_cts_change(&uap->port, status & UART01x_FR_CTS);
>> > + if (delta & uap->fr_cts)
>> > + uart_handle_cts_change(&uap->port, status & uap->fr_cts);
>> >
>> > wake_up_interruptible(&uap->port.state->port.delta_msr_wait);
>> > }
>> > @@ -1487,7 +1547,7 @@ static unsigned int pl011_tx_empty(struct uart_port *port)
>> > struct uart_amba_port *uap =
>> > container_of(port, struct uart_amba_port, port);
>> > unsigned int status = pl011_readw(uap, REG_FR);
>> > - return status & (UART01x_FR_BUSY|UART01x_FR_TXFF) ? 0 : TIOCSER_TEMT;
>> > + return status & (uap->fr_busy|UART01x_FR_TXFF) ? 0 : TIOCSER_TEMT;
>> > }
>> >
>> > static unsigned int pl011_get_mctrl(struct uart_port *port)
>> > @@ -1502,9 +1562,9 @@ static unsigned int pl011_get_mctrl(struct uart_port *port)
>> > result |= tiocmbit
>> >
>> > TIOCMBIT(UART01x_FR_DCD, TIOCM_CAR);
>> > - TIOCMBIT(UART01x_FR_DSR, TIOCM_DSR);
>> > - TIOCMBIT(UART01x_FR_CTS, TIOCM_CTS);
>> > - TIOCMBIT(UART011_FR_RI, TIOCM_RNG);
>> > + TIOCMBIT(uap->fr_dsr, TIOCM_DSR);
>> > + TIOCMBIT(uap->fr_cts, TIOCM_CTS);
>> > + TIOCMBIT(uap->fr_ri, TIOCM_RNG);
>> > #undef TIOCMBIT
>> > return result;
>> > }
>> > @@ -1720,8 +1780,7 @@ static int pl011_startup(struct uart_port *port)
>> > /*
>> > * initialise the old status of the modem signals
>> > */
>> > - uap->old_status = pl011_readw(uap, REG_FR) &
>> > - UART01x_FR_MODEM_ANY;
>> > + uap->old_status = pl011_readw(uap, REG_FR) & UART01x_FR_MODEM_ANY;
>> >
>> > /* Startup DMA */
>> > pl011_dma_startup(uap);
>> > @@ -1800,7 +1859,7 @@ static void pl011_disable_interrupts(struct uart_amba_port *uap)
>> > /* mask all interrupts and clear all pending ones */
>> > uap->im = 0;
>> > pl011_writew(uap, uap->im, REG_IMSC);
>> > - pl011_writew(0xffff, REG_ICR);
>> > + pl011_writew(uap, 0xffff, REG_ICR);
>> >
>> > spin_unlock_irq(&uap->port.lock);
>> > }
>> > @@ -2178,7 +2237,7 @@ pl011_console_write(struct console *co, const char *s, unsigned int count)
>> > */
>> > do {
>> > status = pl011_readw(uap, REG_FR);
>> > - } while (status & UART01x_FR_BUSY);
>> > + } while (status & uap->fr_busy);
>> > if (!uap->vendor->always_enabled)
>> > pl011_writew(uap, old_cr, REG_CR);
>> >
>> > @@ -2295,7 +2354,7 @@ static void pl011_putc(struct uart_port *port, int c)
>> > while (pl011_readw(uap, REG_FR) & UART01x_FR_TXFF)
>> > ;
>> > pl011_writeb(uap, c, REG_DR);
>> > - while (pl011_readw(uap, REG_FR) & UART01x_FR_BUSY)
>> > + while (pl011_readw(uap, REG_FR) & uap->fr_busy)
>> > ;
>> > }
>> >
>> > @@ -2441,6 +2500,7 @@ static int pl011_register_port(struct uart_amba_port *uap)
>> > return ret;
>> > }
>> >
>> > +#ifdef CONFIG_ARM_AMBA
>> > static int pl011_probe(struct amba_device *dev, const struct amba_id *id)
>> > {
>> > struct uart_amba_port *uap;
>> > @@ -2464,6 +2524,10 @@ static int pl011_probe(struct amba_device *dev, const struct amba_id *id)
>> > uap->reg_lut = vendor->reg_lut;
>> > uap->lcrh_rx = vendor->lcrh_rx;
>> > uap->lcrh_tx = vendor->lcrh_tx;
>> > + uap->fr_busy = vendor->fr_busy;
>> > + uap->fr_dsr = vendor->fr_dsr;
>> > + uap->fr_cts = vendor->fr_cts;
>> > + uap->fr_ri = vendor->fr_ri;
>> > uap->fifosize = vendor->get_fifosize(dev);
>> > uap->port.irq = dev->irq[0];
>> > uap->port.ops = &amba_pl011_pops;
>> > @@ -2487,6 +2551,67 @@ static int pl011_remove(struct amba_device *dev)
>> > pl011_unregister_port(uap);
>> > return 0;
>> > }
>> > +#endif
>> > +
>> > +#ifdef CONFIG_SOC_ZX296702
>> > +static int zx_uart_probe(struct platform_device *pdev)
>> > +{
>> > + struct uart_amba_port *uap;
>> > + struct vendor_data *vendor = &vendor_zte;
>> > + struct resource *res;
>> > + int portnr, ret;
>> > +
>> > + portnr = pl011_find_free_port();
>> > + if (portnr < 0)
>> > + return portnr;
>> > +
>> > + uap = devm_kzalloc(&pdev->dev, sizeof(struct uart_amba_port),
>> > + GFP_KERNEL);
>> > + if (!uap) {
>> > + ret = -ENOMEM;
>> > + goto out;
>> > + }
>> > +
>> > + uap->clk = devm_clk_get(&pdev->dev, NULL);
>> > + if (IS_ERR(uap->clk)) {
>> > + ret = PTR_ERR(uap->clk);
>> > + goto out;
>> > + }
>> > +
>> > + uap->vendor = vendor;
>> > + uap->reg_lut = vendor->reg_lut;
>> > + uap->lcrh_rx = vendor->lcrh_rx;
>> > + uap->lcrh_tx = vendor->lcrh_tx;
>> > + uap->fr_busy = vendor->fr_busy;
>> > + uap->fr_dsr = vendor->fr_dsr;
>> > + uap->fr_cts = vendor->fr_cts;
>> > + uap->fr_ri = vendor->fr_ri;
>> > + uap->fifosize = 16;
>> > + uap->port.irq = platform_get_irq(pdev, 0);
>> > + uap->port.ops = &amba_pl011_pops;
>> > +
>> > + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> > +
>> > + ret = pl011_setup_port(&pdev->dev, uap, res, portnr);
>> > + if (ret)
>> > + return ret;
>> > +
>> > + platform_set_drvdata(pdev, uap);
>> > +
>> > + return pl011_register_port(uap);
>> > +out:
>> > + return ret;
>> > +}
>> > +
>> > +static int zx_uart_remove(struct platform_device *pdev)
>> > +{
>> > + struct uart_amba_port *uap = platform_get_drvdata(pdev);
>> > +
>> > + uart_remove_one_port(&amba_reg, &uap->port);
>> > + pl011_unregister_port(uap);
>> > + return 0;
>> > +}
>> > +#endif
>> >
>> > #ifdef CONFIG_PM_SLEEP
>> > static int pl011_suspend(struct device *dev)
>> > @@ -2544,6 +2669,10 @@ static int sbsa_uart_probe(struct platform_device *pdev)
>> >
>> > uap->vendor = &vendor_sbsa;
>> > uap->reg_lut = vendor_sbsa.reg_lut;
>> > + uap->fr_busy = vendor_sbsa.fr_busy;
>> > + uap->fr_dsr = vendor_sbsa.fr_dsr;
>> > + uap->fr_cts = vendor_sbsa.fr_cts;
>> > + uap->fr_ri = vendor_sbsa.fr_ri;
>> > uap->fifosize = 32;
>> > uap->port.irq = platform_get_irq(pdev, 0);
>> > uap->port.ops = &sbsa_uart_pops;
>> > @@ -2593,6 +2722,7 @@ static struct platform_driver arm_sbsa_uart_platform_driver = {
>> > },
>> > };
>> >
>> > +#ifdef CONFIG_ARM_AMBA
>> > static struct amba_id pl011_ids[] = {
>> > {
>> > .id = 0x00041011,
>> > @@ -2618,20 +2748,57 @@ static struct amba_driver pl011_driver = {
>> > .probe = pl011_probe,
>> > .remove = pl011_remove,
>> > };
>> > +#endif
>> > +
>> > +#ifdef CONFIG_SOC_ZX296702
>> > +static const struct of_device_id zx_uart_dt_ids[] = {
>> > + { .compatible = "zte,zx296702-uart", },
>> > + { /* sentinel */ }
>> > +};
>> > +MODULE_DEVICE_TABLE(of, zx_uart_dt_ids);
>> > +
>> > +static struct platform_driver zx_uart_driver = {
>> > + .driver = {
>> > + .name = "zx-uart",
>> > + .owner = THIS_MODULE,
>> > + .pm = &pl011_dev_pm_ops,
>> > + .of_match_table = zx_uart_dt_ids,
>> > + },
>> > + .probe = zx_uart_probe,
>> > + .remove = zx_uart_remove,
>> > +};
>> > +#endif
>> > +
>> >
>> > static int __init pl011_init(void)
>> > {
>> > + int ret;
>> > printk(KERN_INFO "Serial: AMBA PL011 UART driver\n");
>> >
>> > if (platform_driver_register(&arm_sbsa_uart_platform_driver))
>> > pr_warn("could not register SBSA UART platform driver\n");
>> > - return amba_driver_register(&pl011_driver);
>> > +
>> > +#ifdef CONFIG_SOC_ZX296702
>> > + ret = platform_driver_register(&zx_uart_driver);
>> > + if (ret)
>> > + pr_warn("could not register ZX UART platform driver\n");
>> > +#endif
>> > +
>> > +#ifdef CONFIG_ARM_AMBA
>> > + ret = amba_driver_register(&pl011_driver);
>> > +#endif
>> > + return ret;
>> > }
>> >
>> > static void __exit pl011_exit(void)
>> > {
>> > platform_driver_unregister(&arm_sbsa_uart_platform_driver);
>> > +#ifdef CONFIG_SOC_ZX296702
>> > + platform_driver_unregister(&zx_uart_driver);
>> > +#endif
>> > +#ifdef CONFIG_ARM_AMBA
>> > amba_driver_unregister(&pl011_driver);
>> > +#endif
>> > }
>> >
>> > /*
>> > diff --git a/include/linux/amba/serial.h b/include/linux/amba/serial.h
>> > index 0ddb5c0..6a0a89e 100644
>> > --- a/include/linux/amba/serial.h
>> > +++ b/include/linux/amba/serial.h
>> > @@ -33,12 +33,14 @@
>> > #define UART01x_DR 0x00 /* Data read or written from the interface. */
>> > #define UART01x_RSR 0x04 /* Receive status register (Read). */
>> > #define UART01x_ECR 0x04 /* Error clear register (Write). */
>> > +#define ZX_UART01x_DR 0x04 /* Data read or written from the interface. */
>> > #define UART010_LCRH 0x08 /* Line control register, high byte. */
>> > #define ST_UART011_DMAWM 0x08 /* DMA watermark configure register. */
>> > #define UART010_LCRM 0x0C /* Line control register, middle byte. */
>> > #define ST_UART011_TIMEOUT 0x0C /* Timeout period register. */
>> > #define UART010_LCRL 0x10 /* Line control register, low byte. */
>> > #define UART010_CR 0x14 /* Control register. */
>> > +#define ZX_UART01x_FR 0x14 /* Flag register (Read only). */
>> > #define UART01x_FR 0x18 /* Flag register (Read only). */
>> > #define UART010_IIR 0x1C /* Interrupt identification register (Read). */
>> > #define UART010_ICR 0x1C /* Interrupt clear register (Write). */
>> > @@ -49,13 +51,21 @@
>> > #define UART011_LCRH 0x2c /* Line control register. */
>> > #define ST_UART011_LCRH_TX 0x2c /* Tx Line control register. */
>> > #define UART011_CR 0x30 /* Control register. */
>> > +#define ZX_UART011_LCRH_TX 0x30 /* Tx Line control register. */
>> > #define UART011_IFLS 0x34 /* Interrupt fifo level select. */
>> > +#define ZX_UART011_CR 0x34 /* Control register. */
>> > +#define ZX_UART011_IFLS 0x38 /* Interrupt fifo level select. */
>> > #define UART011_IMSC 0x38 /* Interrupt mask. */
>> > #define UART011_RIS 0x3c /* Raw interrupt status. */
>> > #define UART011_MIS 0x40 /* Masked interrupt status. */
>> > +#define ZX_UART011_IMSC 0x40 /* Interrupt mask. */
>> > #define UART011_ICR 0x44 /* Interrupt clear register. */
>> > +#define ZX_UART011_RIS 0x44 /* Raw interrupt status. */
>> > #define UART011_DMACR 0x48 /* DMA control register. */
>> > +#define ZX_UART011_MIS 0x48 /* Masked interrupt status. */
>> > +#define ZX_UART011_ICR 0x4c /* Interrupt clear register. */
>> > #define ST_UART011_XFCR 0x50 /* XON/XOFF control register. */
>> > +#define ZX_UART011_DMACR 0x50 /* DMA control register. */
>> > #define ST_UART011_XON1 0x54 /* XON1 register. */
>> > #define ST_UART011_XON2 0x58 /* XON2 register. */
>> > #define ST_UART011_XOFF1 0x5C /* XON1 register. */
>> > @@ -75,15 +85,19 @@
>> > #define UART01x_RSR_PE 0x02
>> > #define UART01x_RSR_FE 0x01
>> >
>> > +#define ZX_UART01x_FR_BUSY 0x300
>> > #define UART011_FR_RI 0x100
>> > #define UART011_FR_TXFE 0x080
>> > #define UART011_FR_RXFF 0x040
>> > #define UART01x_FR_TXFF 0x020
>> > #define UART01x_FR_RXFE 0x010
>> > #define UART01x_FR_BUSY 0x008
>> > +#define ZX_UART01x_FR_DSR 0x008
>> > #define UART01x_FR_DCD 0x004
>> > #define UART01x_FR_DSR 0x002
>> > +#define ZX_UART01x_FR_CTS 0x002
>> > #define UART01x_FR_CTS 0x001
>> > +#define ZX_UART011_FR_RI 0x001
>> > #define UART01x_FR_TMSK (UART01x_FR_TXFF + UART01x_FR_BUSY)
>> >
>> > #define UART011_CR_CTSEN 0x8000 /* CTS hardware flow control */
>> > --
>> > 1.9.1
>> >
>
> --
> FTTC broadband for 0.8mile line: currently at 9.6Mbps down 400kbps up
> according to speedtest.net.
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