diff options
Diffstat (limited to 'drivers/ata/pata_bk3710.c')
| -rw-r--r-- | drivers/ata/pata_bk3710.c | 380 |
1 files changed, 0 insertions, 380 deletions
diff --git a/drivers/ata/pata_bk3710.c b/drivers/ata/pata_bk3710.c deleted file mode 100644 index fad95cfecced..000000000000 --- a/drivers/ata/pata_bk3710.c +++ /dev/null @@ -1,380 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 - -/* - * Palmchip BK3710 PATA controller driver - * - * Copyright (c) 2017 Samsung Electronics Co., Ltd. - * http://www.samsung.com - * - * Based on palm_bk3710.c: - * - * Copyright (C) 2006 Texas Instruments. - * Copyright (C) 2007 MontaVista Software, Inc., <source@mvista.com> - */ - -#include <linux/ata.h> -#include <linux/clk.h> -#include <linux/delay.h> -#include <linux/init.h> -#include <linux/ioport.h> -#include <linux/kernel.h> -#include <linux/libata.h> -#include <linux/module.h> -#include <linux/platform_device.h> -#include <linux/types.h> - -#define DRV_NAME "pata_bk3710" - -#define BK3710_TF_OFFSET 0x1F0 -#define BK3710_CTL_OFFSET 0x3F6 - -#define BK3710_BMISP 0x02 -#define BK3710_IDETIMP 0x40 -#define BK3710_UDMACTL 0x48 -#define BK3710_MISCCTL 0x50 -#define BK3710_REGSTB 0x54 -#define BK3710_REGRCVR 0x58 -#define BK3710_DATSTB 0x5C -#define BK3710_DATRCVR 0x60 -#define BK3710_DMASTB 0x64 -#define BK3710_DMARCVR 0x68 -#define BK3710_UDMASTB 0x6C -#define BK3710_UDMATRP 0x70 -#define BK3710_UDMAENV 0x74 -#define BK3710_IORDYTMP 0x78 - -static struct scsi_host_template pata_bk3710_sht = { - ATA_BMDMA_SHT(DRV_NAME), -}; - -static unsigned int ideclk_period; /* in nanoseconds */ - -struct pata_bk3710_udmatiming { - unsigned int rptime; /* tRP -- Ready to pause time (nsec) */ - unsigned int cycletime; /* tCYCTYP2/2 -- avg Cycle Time (nsec) */ - /* tENV is always a minimum of 20 nsec */ -}; - -static const struct pata_bk3710_udmatiming pata_bk3710_udmatimings[6] = { - { 160, 240 / 2 }, /* UDMA Mode 0 */ - { 125, 160 / 2 }, /* UDMA Mode 1 */ - { 100, 120 / 2 }, /* UDMA Mode 2 */ - { 100, 90 / 2 }, /* UDMA Mode 3 */ - { 100, 60 / 2 }, /* UDMA Mode 4 */ - { 85, 40 / 2 }, /* UDMA Mode 5 */ -}; - -static void pata_bk3710_setudmamode(void __iomem *base, unsigned int dev, - unsigned int mode) -{ - u32 val32; - u16 val16; - u8 tenv, trp, t0; - - /* DMA Data Setup */ - t0 = DIV_ROUND_UP(pata_bk3710_udmatimings[mode].cycletime, - ideclk_period) - 1; - tenv = DIV_ROUND_UP(20, ideclk_period) - 1; - trp = DIV_ROUND_UP(pata_bk3710_udmatimings[mode].rptime, - ideclk_period) - 1; - - /* udmastb Ultra DMA Access Strobe Width */ - val32 = ioread32(base + BK3710_UDMASTB) & (0xFF << (dev ? 0 : 8)); - val32 |= t0 << (dev ? 8 : 0); - iowrite32(val32, base + BK3710_UDMASTB); - - /* udmatrp Ultra DMA Ready to Pause Time */ - val32 = ioread32(base + BK3710_UDMATRP) & (0xFF << (dev ? 0 : 8)); - val32 |= trp << (dev ? 8 : 0); - iowrite32(val32, base + BK3710_UDMATRP); - - /* udmaenv Ultra DMA envelop Time */ - val32 = ioread32(base + BK3710_UDMAENV) & (0xFF << (dev ? 0 : 8)); - val32 |= tenv << (dev ? 8 : 0); - iowrite32(val32, base + BK3710_UDMAENV); - - /* Enable UDMA for Device */ - val16 = ioread16(base + BK3710_UDMACTL) | (1 << dev); - iowrite16(val16, base + BK3710_UDMACTL); -} - -static void pata_bk3710_setmwdmamode(void __iomem *base, unsigned int dev, - unsigned short min_cycle, - unsigned int mode) -{ - const struct ata_timing *t; - int cycletime; - u32 val32; - u16 val16; - u8 td, tkw, t0; - - t = ata_timing_find_mode(mode); - cycletime = max_t(int, t->cycle, min_cycle); - - /* DMA Data Setup */ - t0 = DIV_ROUND_UP(cycletime, ideclk_period); - td = DIV_ROUND_UP(t->active, ideclk_period); - tkw = t0 - td - 1; - td--; - - val32 = ioread32(base + BK3710_DMASTB) & (0xFF << (dev ? 0 : 8)); - val32 |= td << (dev ? 8 : 0); - iowrite32(val32, base + BK3710_DMASTB); - - val32 = ioread32(base + BK3710_DMARCVR) & (0xFF << (dev ? 0 : 8)); - val32 |= tkw << (dev ? 8 : 0); - iowrite32(val32, base + BK3710_DMARCVR); - - /* Disable UDMA for Device */ - val16 = ioread16(base + BK3710_UDMACTL) & ~(1 << dev); - iowrite16(val16, base + BK3710_UDMACTL); -} - -static void pata_bk3710_set_dmamode(struct ata_port *ap, - struct ata_device *adev) -{ - void __iomem *base = (void __iomem *)ap->ioaddr.bmdma_addr; - int is_slave = adev->devno; - const u8 xferspeed = adev->dma_mode; - - if (xferspeed >= XFER_UDMA_0) - pata_bk3710_setudmamode(base, is_slave, - xferspeed - XFER_UDMA_0); - else - pata_bk3710_setmwdmamode(base, is_slave, - adev->id[ATA_ID_EIDE_DMA_MIN], - xferspeed); -} - -static void pata_bk3710_setpiomode(void __iomem *base, struct ata_device *pair, - unsigned int dev, unsigned int cycletime, - unsigned int mode) -{ - const struct ata_timing *t; - u32 val32; - u8 t2, t2i, t0; - - t = ata_timing_find_mode(XFER_PIO_0 + mode); - - /* PIO Data Setup */ - t0 = DIV_ROUND_UP(cycletime, ideclk_period); - t2 = DIV_ROUND_UP(t->active, ideclk_period); - - t2i = t0 - t2 - 1; - t2--; - - val32 = ioread32(base + BK3710_DATSTB) & (0xFF << (dev ? 0 : 8)); - val32 |= t2 << (dev ? 8 : 0); - iowrite32(val32, base + BK3710_DATSTB); - - val32 = ioread32(base + BK3710_DATRCVR) & (0xFF << (dev ? 0 : 8)); - val32 |= t2i << (dev ? 8 : 0); - iowrite32(val32, base + BK3710_DATRCVR); - - /* FIXME: this is broken also in the old driver */ - if (pair) { - u8 mode2 = pair->pio_mode - XFER_PIO_0; - - if (mode2 < mode) - mode = mode2; - } - - /* TASKFILE Setup */ - t0 = DIV_ROUND_UP(t->cyc8b, ideclk_period); - t2 = DIV_ROUND_UP(t->act8b, ideclk_period); - - t2i = t0 - t2 - 1; - t2--; - - val32 = ioread32(base + BK3710_REGSTB) & (0xFF << (dev ? 0 : 8)); - val32 |= t2 << (dev ? 8 : 0); - iowrite32(val32, base + BK3710_REGSTB); - - val32 = ioread32(base + BK3710_REGRCVR) & (0xFF << (dev ? 0 : 8)); - val32 |= t2i << (dev ? 8 : 0); - iowrite32(val32, base + BK3710_REGRCVR); -} - -static void pata_bk3710_set_piomode(struct ata_port *ap, - struct ata_device *adev) -{ - void __iomem *base = (void __iomem *)ap->ioaddr.bmdma_addr; - struct ata_device *pair = ata_dev_pair(adev); - const struct ata_timing *t = ata_timing_find_mode(adev->pio_mode); - const u16 *id = adev->id; - unsigned int cycle_time = 0; - int is_slave = adev->devno; - const u8 pio = adev->pio_mode - XFER_PIO_0; - - if (id[ATA_ID_FIELD_VALID] & 2) { - if (ata_id_has_iordy(id)) - cycle_time = id[ATA_ID_EIDE_PIO_IORDY]; - else - cycle_time = id[ATA_ID_EIDE_PIO]; - - /* conservative "downgrade" for all pre-ATA2 drives */ - if (pio < 3 && cycle_time < t->cycle) - cycle_time = 0; /* use standard timing */ - } - - if (!cycle_time) - cycle_time = t->cycle; - - pata_bk3710_setpiomode(base, pair, is_slave, cycle_time, pio); -} - -static void pata_bk3710_chipinit(void __iomem *base) -{ - /* - * REVISIT: the ATA reset signal needs to be managed through a - * GPIO, which means it should come from platform_data. Until - * we get and use such information, we have to trust that things - * have been reset before we get here. - */ - - /* - * Program the IDETIMP Register Value based on the following assumptions - * - * (ATA_IDETIMP_IDEEN , ENABLE ) | - * (ATA_IDETIMP_PREPOST1 , DISABLE) | - * (ATA_IDETIMP_PREPOST0 , DISABLE) | - * - * DM6446 silicon rev 2.1 and earlier have no observed net benefit - * from enabling prefetch/postwrite. - */ - iowrite16(BIT(15), base + BK3710_IDETIMP); - - /* - * UDMACTL Ultra-ATA DMA Control - * (ATA_UDMACTL_UDMAP1 , 0 ) | - * (ATA_UDMACTL_UDMAP0 , 0 ) - * - */ - iowrite16(0, base + BK3710_UDMACTL); - - /* - * MISCCTL Miscellaneous Conrol Register - * (ATA_MISCCTL_HWNHLD1P , 1 cycle) - * (ATA_MISCCTL_HWNHLD0P , 1 cycle) - * (ATA_MISCCTL_TIMORIDE , 1) - */ - iowrite32(0x001, base + BK3710_MISCCTL); - - /* - * IORDYTMP IORDY Timer for Primary Register - * (ATA_IORDYTMP_IORDYTMP , DISABLE) - */ - iowrite32(0, base + BK3710_IORDYTMP); - - /* - * Configure BMISP Register - * (ATA_BMISP_DMAEN1 , DISABLE ) | - * (ATA_BMISP_DMAEN0 , DISABLE ) | - * (ATA_BMISP_IORDYINT , CLEAR) | - * (ATA_BMISP_INTRSTAT , CLEAR) | - * (ATA_BMISP_DMAERROR , CLEAR) - */ - iowrite16(0xE, base + BK3710_BMISP); - - pata_bk3710_setpiomode(base, NULL, 0, 600, 0); - pata_bk3710_setpiomode(base, NULL, 1, 600, 0); -} - -static struct ata_port_operations pata_bk3710_ports_ops = { - .inherits = &ata_bmdma_port_ops, - .cable_detect = ata_cable_80wire, - - .set_piomode = pata_bk3710_set_piomode, - .set_dmamode = pata_bk3710_set_dmamode, -}; - -static int __init pata_bk3710_probe(struct platform_device *pdev) -{ - struct clk *clk; - struct resource *mem; - struct ata_host *host; - struct ata_port *ap; - void __iomem *base; - unsigned long rate; - int irq; - - clk = devm_clk_get(&pdev->dev, NULL); - if (IS_ERR(clk)) - return -ENODEV; - - clk_enable(clk); - rate = clk_get_rate(clk); - if (!rate) - return -EINVAL; - - /* NOTE: round *down* to meet minimum timings; we count in clocks */ - ideclk_period = 1000000000UL / rate; - - mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); - - irq = platform_get_irq(pdev, 0); - if (irq < 0) { - pr_err(DRV_NAME ": failed to get IRQ resource\n"); - return irq; - } - - base = devm_ioremap_resource(&pdev->dev, mem); - if (IS_ERR(base)) - return PTR_ERR(base); - - /* configure the Palmchip controller */ - pata_bk3710_chipinit(base); - - /* allocate host */ - host = ata_host_alloc(&pdev->dev, 1); - if (!host) - return -ENOMEM; - ap = host->ports[0]; - - ap->ops = &pata_bk3710_ports_ops; - ap->pio_mask = ATA_PIO4; - ap->mwdma_mask = ATA_MWDMA2; - ap->udma_mask = rate < 100000000 ? ATA_UDMA4 : ATA_UDMA5; - ap->flags |= ATA_FLAG_SLAVE_POSS; - - ap->ioaddr.data_addr = base + BK3710_TF_OFFSET; - ap->ioaddr.error_addr = base + BK3710_TF_OFFSET + 1; - ap->ioaddr.feature_addr = base + BK3710_TF_OFFSET + 1; - ap->ioaddr.nsect_addr = base + BK3710_TF_OFFSET + 2; - ap->ioaddr.lbal_addr = base + BK3710_TF_OFFSET + 3; - ap->ioaddr.lbam_addr = base + BK3710_TF_OFFSET + 4; - ap->ioaddr.lbah_addr = base + BK3710_TF_OFFSET + 5; - ap->ioaddr.device_addr = base + BK3710_TF_OFFSET + 6; - ap->ioaddr.status_addr = base + BK3710_TF_OFFSET + 7; - ap->ioaddr.command_addr = base + BK3710_TF_OFFSET + 7; - - ap->ioaddr.altstatus_addr = base + BK3710_CTL_OFFSET; - ap->ioaddr.ctl_addr = base + BK3710_CTL_OFFSET; - - ap->ioaddr.bmdma_addr = base; - - ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", - (unsigned long)base + BK3710_TF_OFFSET, - (unsigned long)base + BK3710_CTL_OFFSET); - - /* activate */ - return ata_host_activate(host, irq, ata_sff_interrupt, 0, - &pata_bk3710_sht); -} - -/* work with hotplug and coldplug */ -MODULE_ALIAS("platform:palm_bk3710"); - -static struct platform_driver pata_bk3710_driver = { - .driver = { - .name = "palm_bk3710", - }, -}; - -static int __init pata_bk3710_init(void) -{ - return platform_driver_probe(&pata_bk3710_driver, pata_bk3710_probe); -} - -module_init(pata_bk3710_init); -MODULE_LICENSE("GPL v2"); |