From 8cd90e50d1408c65c355084b1c7f8f9085f49c6b Mon Sep 17 00:00:00 2001 From: Jun Nie Date: Fri, 31 Jul 2015 15:49:19 +0800 Subject: [PATCH] uart: pl011: Add support to ZTE ZX296702 uart 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 Signed-off-by: Greg Kroah-Hartman --- 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 687b1ea294b7..ed299b9e6375 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 017443d092c1..2af09ab153b6 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 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 +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 0ddb5c02ad8b..6a0a89ed7f81 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 */