Op 29-06-10 13:05, Kukjin Kim schreef: > From: Abhilash Kesavan <a.kesavan@xxxxxxxxxxx> > > Adds support for the Samsung PATA controller. This driver is based on the > Libata subsystem and references the earlier patches sent for IDE subsystem. > > Signed-off-by: Abhilash Kesavan <a.kesavan@xxxxxxxxxxx> > Signed-off-by: Kukjin Kim <kgene.kim@xxxxxxxxxxx> > Cc: Ben Dooks <ben-linux@xxxxxxxxx> > --- > drivers/ata/Kconfig | 9 + > drivers/ata/Makefile | 1 + > drivers/ata/pata_samsung_cf.c | 728 +++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 738 insertions(+), 0 deletions(-) > create mode 100644 drivers/ata/pata_samsung_cf.c > > diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig > index 73f8833..51e28e7 100644 > --- a/drivers/ata/Kconfig > +++ b/drivers/ata/Kconfig > @@ -796,6 +796,15 @@ config PATA_RZ1000 > > If unsure, say N. > > +config PATA_SAMSUNG_CF > + tristate "Samsung SoC PATA support" > + depends on SAMSUNG_DEV_IDE > + help > + This option enables basic support for Samsung's S3C/S5P board > + PATA controllers via the new ATA layer > + > + If unsure, say N. > + > config PATA_WINBOND_VLB > tristate "Winbond W83759A VLB PATA support (Experimental)" > depends on ISA && EXPERIMENTAL > diff --git a/drivers/ata/Makefile b/drivers/ata/Makefile > index 7ef89d7..9576776 100644 > --- a/drivers/ata/Makefile > +++ b/drivers/ata/Makefile > @@ -87,6 +87,7 @@ obj-$(CONFIG_PATA_OF_PLATFORM) += pata_of_platform.o > obj-$(CONFIG_PATA_QDI) += pata_qdi.o > obj-$(CONFIG_PATA_RB532) += pata_rb532_cf.o > obj-$(CONFIG_PATA_RZ1000) += pata_rz1000.o > +obj-$(CONFIG_PATA_SAMSUNG_CF) += pata_samsung_cf.o > obj-$(CONFIG_PATA_WINBOND_VLB) += pata_winbond.o > > # Should be last but two libata driver > diff --git a/drivers/ata/pata_samsung_cf.c b/drivers/ata/pata_samsung_cf.c > new file mode 100644 > index 0000000..26b96c3 > --- /dev/null > +++ b/drivers/ata/pata_samsung_cf.c > @@ -0,0 +1,728 @@ > +/* > + * Copyright (c) 2010 Samsung Electronics Co., Ltd. > + * http://www.samsung.com > + * > + * PATA driver for Samsung SoCs. > + * Supports CF Interface in True IDE mode. Currently only PIO mode has been > + * implemented; UDMA support has to be added. > + * > + * Based on: > + * PATA driver for AT91SAM9260 Static Memory Controller > + * PATA driver for Toshiba SCC controller > + * > + * This program is free software; you can redistribute it and/or modify it > + * under the terms of the GNU General Public License version 2 > + * as published by the Free Software Foundation. > +*/ > + > +#include <linux/kernel.h> > +#include <linux/module.h> > +#include <linux/init.h> > +#include <linux/clk.h> > +#include <linux/libata.h> > +#include <linux/platform_device.h> > +#include <linux/slab.h> > + > +#include <plat/ata.h> > +#include <plat/regs-ata.h> > + > +#define DRV_NAME "pata_samsung_cf" > +#define DRV_VERSION "0.1" > + > +enum s3c_cpu_type { > + TYPE_S3C64XX, > + TYPE_S5PC100, > + TYPE_S5PV210, > +}; > + > +/* > + * struct s3c_ide_info - S3C PATA instance. > + * @clk: The clock resource for this controller. > + * @ide_addr: The area mapped for the hardware registers. > + * @sfr_addr: The area mapped for the special function registers. > + * @irq: The IRQ number we are using. > + * @cpu_type: The exact type of this controller. > + * @fifo_status_reg: The ATA_FIFO_STATUS register offset. > + */ > +struct s3c_ide_info { > + struct clk *clk; > + void __iomem *ide_addr; > + void __iomem *sfr_addr; > + unsigned int irq; > + enum s3c_cpu_type cpu_type; > + unsigned int fifo_status_reg; > +}; > + > +static void pata_s3c_set_endian(void __iomem *s3c_ide_regbase, u8 mode) > +{ > + u32 reg = readl(s3c_ide_regbase + S3C_ATA_CFG); > + reg = mode ? (reg & ~S3C_ATA_CFG_SWAP) : (reg | S3C_ATA_CFG_SWAP); > + writel(reg, s3c_ide_regbase + S3C_ATA_CFG); > +} > + > +static void pata_s3c_cfg_mode(void __iomem *s3c_ide_sfrbase) > +{ > + /* Select true-ide as the internal operating mode */ > + writel(readl(s3c_ide_sfrbase + S3C_CFATA_MUX) | S3C_CFATA_MUX_TRUEIDE, > + s3c_ide_sfrbase + S3C_CFATA_MUX); > +} > + > +static unsigned long > +pata_s3c_setup_timing(struct s3c_ide_info *info, const struct ata_timing *ata) > +{ > + int t1 = ata->setup; > + int t2 = ata->act8b; > + int t2i = ata->rec8b; > + ulong piotime; > + > + piotime = ((t2i & 0xff) << 12) | ((t2 & 0xff) << 4) | (t1 & 0xf); > + > + return piotime; > +} > + > +static void pata_s3c_set_piomode(struct ata_port *ap, struct ata_device *adev) > +{ > + struct s3c_ide_info *info = ap->host->private_data; > + struct ata_timing timing; > + int cycle_time; > + ulong ata_cfg = readl(info->ide_addr + S3C_ATA_CFG); > + ulong piotime; > + > + /* Enables IORDY if mode requires it */ > + if (ata_pio_need_iordy(adev)) > + ata_cfg |= S3C_ATA_CFG_IORDYEN; > + else > + ata_cfg &= ~S3C_ATA_CFG_IORDYEN; > + > + cycle_time = (int)(1000000000UL / clk_get_rate(info->clk)); > + > + ata_timing_compute(adev, adev->pio_mode, &timing, > + cycle_time * 1000, 0); > + > + piotime = pata_s3c_setup_timing(info, &timing); > + > + writel(ata_cfg, info->ide_addr + S3C_ATA_CFG); > + writel(piotime, info->ide_addr + S3C_ATA_PIO_TIME); > +} > + > +/* > + * Waits until the IDE controller is able to perform next read/write > + * operation to the disk. Needed for 64XX series boards only. > + */ > +static int wait_for_host_ready(struct s3c_ide_info *info) > +{ > + ulong timeout; > + void __iomem *fifo_reg = info->ide_addr + info->fifo_status_reg; > + Shouldn't this have an if (type != S3C64XX) return 0; ? > + /* wait for maximum of 20 msec */ > + timeout = jiffies + msecs_to_jiffies(20); > + while (time_before(jiffies, timeout)) { > + if ((readl(fifo_reg) >> 28) == 0) > + return 0; > + } > + return -EBUSY; > +} -- Maurus Cuelenaere -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
