a1efdaba2d
Currently reset methods are not specified directly in the ata_port_operations table. If a LLD wants to use custom reset methods, it should construct and use a error_handler which uses those reset methods. It's done this way for two reasons. First, the ops table already contained too many methods and adding four more of them would noticeably increase the amount of necessary boilerplate code all over low level drivers. Second, as ->error_handler uses those reset methods, it can get confusing. ie. By overriding ->error_handler, those reset ops can be made useless making layering a bit hazy. Now that ops table uses inheritance, the first problem doesn't exist anymore. The second isn't completely solved but is relieved by providing default values - most drivers can just override what it has implemented and don't have to concern itself about higher level callbacks. In fact, there currently is no driver which actually modifies error handling behavior. Drivers which override ->error_handler just wraps the standard error handler only to prepare the controller for EH. I don't think making ops layering strict has any noticeable benefit. This patch makes ->prereset, ->softreset, ->hardreset, ->postreset and their PMP counterparts propoer ops. Default ops are provided in the base ops tables and drivers are converted to override individual reset methods instead of creating custom error_handler. * ata_std_error_handler() doesn't use sata_std_hardreset() if SCRs aren't accessible. sata_promise doesn't need to use separate error_handlers for PATA and SATA anymore. * softreset is broken for sata_inic162x and sata_sx4. As libata now always prefers hardreset, this doesn't really matter but the ops are forced to NULL using ATA_OP_NULL for documentation purpose. * pata_hpt374 needs to use different prereset for the first and second PCI functions. This used to be done by branching from hpt374_error_handler(). The proper way to do this is to use separate ops and port_info tables for each function. Converted. Signed-off-by: Tejun Heo <htejun@gmail.com>
315 lines
8.2 KiB
C
315 lines
8.2 KiB
C
/*
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* pata_it8213.c - iTE Tech. Inc. IT8213 PATA driver
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*
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* The IT8213 is a very Intel ICH like device for timing purposes, having
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* a similar register layout and the same split clock arrangement. Cable
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* detection is different, and it does not have slave channels or all the
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* clutter of later ICH/SATA setups.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/init.h>
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#include <linux/blkdev.h>
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <scsi/scsi_host.h>
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#include <linux/libata.h>
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#include <linux/ata.h>
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#define DRV_NAME "pata_it8213"
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#define DRV_VERSION "0.0.3"
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/**
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* it8213_pre_reset - check for 40/80 pin
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* @link: link
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* @deadline: deadline jiffies for the operation
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*
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* Filter out ports by the enable bits before doing the normal reset
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* and probe.
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*/
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static int it8213_pre_reset(struct ata_link *link, unsigned long deadline)
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{
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static const struct pci_bits it8213_enable_bits[] = {
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{ 0x41U, 1U, 0x80UL, 0x80UL }, /* port 0 */
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};
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struct ata_port *ap = link->ap;
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struct pci_dev *pdev = to_pci_dev(ap->host->dev);
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if (!pci_test_config_bits(pdev, &it8213_enable_bits[ap->port_no]))
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return -ENOENT;
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return ata_std_prereset(link, deadline);
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}
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/**
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* it8213_cable_detect - check for 40/80 pin
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* @ap: Port
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*
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* Perform cable detection for the 8213 ATA interface. This is
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* different to the PIIX arrangement
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*/
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static int it8213_cable_detect(struct ata_port *ap)
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{
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struct pci_dev *pdev = to_pci_dev(ap->host->dev);
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u8 tmp;
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pci_read_config_byte(pdev, 0x42, &tmp);
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if (tmp & 2) /* The initial docs are incorrect */
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return ATA_CBL_PATA40;
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return ATA_CBL_PATA80;
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}
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/**
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* it8213_set_piomode - Initialize host controller PATA PIO timings
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* @ap: Port whose timings we are configuring
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* @adev: Device whose timings we are configuring
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*
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* Set PIO mode for device, in host controller PCI config space.
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*
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* LOCKING:
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* None (inherited from caller).
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*/
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static void it8213_set_piomode (struct ata_port *ap, struct ata_device *adev)
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{
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unsigned int pio = adev->pio_mode - XFER_PIO_0;
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struct pci_dev *dev = to_pci_dev(ap->host->dev);
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unsigned int idetm_port= ap->port_no ? 0x42 : 0x40;
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u16 idetm_data;
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int control = 0;
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/*
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* See Intel Document 298600-004 for the timing programing rules
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* for PIIX/ICH. The 8213 is a clone so very similar
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*/
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static const /* ISP RTC */
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u8 timings[][2] = { { 0, 0 },
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{ 0, 0 },
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{ 1, 0 },
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{ 2, 1 },
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{ 2, 3 }, };
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if (pio > 2)
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control |= 1; /* TIME1 enable */
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if (ata_pio_need_iordy(adev)) /* PIO 3/4 require IORDY */
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control |= 2; /* IORDY enable */
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/* Bit 2 is set for ATAPI on the IT8213 - reverse of ICH/PIIX */
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if (adev->class != ATA_DEV_ATA)
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control |= 4;
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pci_read_config_word(dev, idetm_port, &idetm_data);
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/* Enable PPE, IE and TIME as appropriate */
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if (adev->devno == 0) {
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idetm_data &= 0xCCF0;
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idetm_data |= control;
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idetm_data |= (timings[pio][0] << 12) |
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(timings[pio][1] << 8);
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} else {
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u8 slave_data;
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idetm_data &= 0xCC0F;
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idetm_data |= (control << 4);
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/* Slave timing in separate register */
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pci_read_config_byte(dev, 0x44, &slave_data);
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slave_data &= 0xF0;
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slave_data |= ((timings[pio][0] << 2) | timings[pio][1]) << 4;
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pci_write_config_byte(dev, 0x44, slave_data);
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}
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idetm_data |= 0x4000; /* Ensure SITRE is enabled */
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pci_write_config_word(dev, idetm_port, idetm_data);
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}
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/**
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* it8213_set_dmamode - Initialize host controller PATA DMA timings
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* @ap: Port whose timings we are configuring
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* @adev: Device to program
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*
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* Set UDMA/MWDMA mode for device, in host controller PCI config space.
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* This device is basically an ICH alike.
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*
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* LOCKING:
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* None (inherited from caller).
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*/
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static void it8213_set_dmamode (struct ata_port *ap, struct ata_device *adev)
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{
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struct pci_dev *dev = to_pci_dev(ap->host->dev);
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u16 master_data;
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u8 speed = adev->dma_mode;
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int devid = adev->devno;
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u8 udma_enable;
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static const /* ISP RTC */
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u8 timings[][2] = { { 0, 0 },
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{ 0, 0 },
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{ 1, 0 },
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{ 2, 1 },
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{ 2, 3 }, };
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pci_read_config_word(dev, 0x40, &master_data);
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pci_read_config_byte(dev, 0x48, &udma_enable);
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if (speed >= XFER_UDMA_0) {
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unsigned int udma = adev->dma_mode - XFER_UDMA_0;
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u16 udma_timing;
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u16 ideconf;
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int u_clock, u_speed;
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/* Clocks follow the PIIX style */
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u_speed = min(2 - (udma & 1), udma);
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if (udma == 5)
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u_clock = 0x1000; /* 100Mhz */
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else if (udma > 2)
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u_clock = 1; /* 66Mhz */
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else
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u_clock = 0; /* 33Mhz */
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udma_enable |= (1 << devid);
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/* Load the UDMA mode number */
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pci_read_config_word(dev, 0x4A, &udma_timing);
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udma_timing &= ~(3 << (4 * devid));
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udma_timing |= (udma & 3) << (4 * devid);
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pci_write_config_word(dev, 0x4A, udma_timing);
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/* Load the clock selection */
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pci_read_config_word(dev, 0x54, &ideconf);
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ideconf &= ~(0x1001 << devid);
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ideconf |= u_clock << devid;
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pci_write_config_word(dev, 0x54, ideconf);
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} else {
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/*
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* MWDMA is driven by the PIO timings. We must also enable
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* IORDY unconditionally along with TIME1. PPE has already
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* been set when the PIO timing was set.
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*/
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unsigned int mwdma = adev->dma_mode - XFER_MW_DMA_0;
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unsigned int control;
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u8 slave_data;
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static const unsigned int needed_pio[3] = {
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XFER_PIO_0, XFER_PIO_3, XFER_PIO_4
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};
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int pio = needed_pio[mwdma] - XFER_PIO_0;
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control = 3; /* IORDY|TIME1 */
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/* If the drive MWDMA is faster than it can do PIO then
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we must force PIO into PIO0 */
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if (adev->pio_mode < needed_pio[mwdma])
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/* Enable DMA timing only */
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control |= 8; /* PIO cycles in PIO0 */
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if (devid) { /* Slave */
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master_data &= 0xFF4F; /* Mask out IORDY|TIME1|DMAONLY */
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master_data |= control << 4;
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pci_read_config_byte(dev, 0x44, &slave_data);
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slave_data &= (0x0F + 0xE1 * ap->port_no);
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/* Load the matching timing */
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slave_data |= ((timings[pio][0] << 2) | timings[pio][1]) << (ap->port_no ? 4 : 0);
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pci_write_config_byte(dev, 0x44, slave_data);
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} else { /* Master */
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master_data &= 0xCCF4; /* Mask out IORDY|TIME1|DMAONLY
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and master timing bits */
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master_data |= control;
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master_data |=
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(timings[pio][0] << 12) |
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(timings[pio][1] << 8);
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}
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udma_enable &= ~(1 << devid);
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pci_write_config_word(dev, 0x40, master_data);
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}
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pci_write_config_byte(dev, 0x48, udma_enable);
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}
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static struct scsi_host_template it8213_sht = {
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ATA_BMDMA_SHT(DRV_NAME),
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};
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static struct ata_port_operations it8213_ops = {
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.inherits = &ata_bmdma_port_ops,
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.cable_detect = it8213_cable_detect,
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.set_piomode = it8213_set_piomode,
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.set_dmamode = it8213_set_dmamode,
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.prereset = it8213_pre_reset,
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};
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/**
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* it8213_init_one - Register 8213 ATA PCI device with kernel services
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* @pdev: PCI device to register
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* @ent: Entry in it8213_pci_tbl matching with @pdev
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*
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* Called from kernel PCI layer.
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*
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* LOCKING:
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* Inherited from PCI layer (may sleep).
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*
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* RETURNS:
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* Zero on success, or -ERRNO value.
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*/
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static int it8213_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
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{
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static int printed_version;
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static const struct ata_port_info info = {
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.flags = ATA_FLAG_SLAVE_POSS,
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.pio_mask = 0x1f, /* pio0-4 */
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.mwdma_mask = 0x07, /* mwdma0-2 */
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.udma_mask = ATA_UDMA4, /* FIXME: want UDMA 100? */
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.port_ops = &it8213_ops,
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};
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/* Current IT8213 stuff is single port */
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const struct ata_port_info *ppi[] = { &info, &ata_dummy_port_info };
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if (!printed_version++)
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dev_printk(KERN_DEBUG, &pdev->dev,
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"version " DRV_VERSION "\n");
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return ata_pci_init_one(pdev, ppi, &it8213_sht, NULL);
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}
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static const struct pci_device_id it8213_pci_tbl[] = {
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{ PCI_VDEVICE(ITE, PCI_DEVICE_ID_ITE_8213), },
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{ } /* terminate list */
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};
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static struct pci_driver it8213_pci_driver = {
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.name = DRV_NAME,
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.id_table = it8213_pci_tbl,
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.probe = it8213_init_one,
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.remove = ata_pci_remove_one,
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#ifdef CONFIG_PM
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.suspend = ata_pci_device_suspend,
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.resume = ata_pci_device_resume,
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#endif
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};
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static int __init it8213_init(void)
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{
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return pci_register_driver(&it8213_pci_driver);
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}
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static void __exit it8213_exit(void)
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{
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pci_unregister_driver(&it8213_pci_driver);
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}
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module_init(it8213_init);
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module_exit(it8213_exit);
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MODULE_AUTHOR("Alan Cox");
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MODULE_DESCRIPTION("SCSI low-level driver for the ITE 8213");
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MODULE_LICENSE("GPL");
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MODULE_DEVICE_TABLE(pci, it8213_pci_tbl);
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MODULE_VERSION(DRV_VERSION);
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