1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * pata-cs5535.c - CS5535 PATA for new ATA layer 4 * (C) 2005-2006 Red Hat Inc 5 * Alan Cox <alan@lxorguk.ukuu.org.uk> 6 * 7 * based upon cs5535.c from AMD <Jens.Altmann@amd.com> as cleaned up and 8 * made readable and Linux style by Wolfgang Zuleger <wolfgang.zuleger@gmx.de> 9 * and Alexander Kiausch <alex.kiausch@t-online.de> 10 * 11 * Loosely based on the piix & svwks drivers. 12 * 13 * Documentation: 14 * Available from AMD web site. 15 * TODO 16 * Review errata to see if serializing is necessary 17 */ 18 19 #include <linux/kernel.h> 20 #include <linux/module.h> 21 #include <linux/pci.h> 22 #include <linux/blkdev.h> 23 #include <linux/delay.h> 24 #include <scsi/scsi_host.h> 25 #include <linux/libata.h> 26 #include <asm/msr.h> 27 28 #define DRV_NAME "pata_cs5535" 29 #define DRV_VERSION "0.2.12" 30 31 /* 32 * The Geode (Aka Athlon GX now) uses an internal MSR based 33 * bus system for control. Demented but there you go. 34 */ 35 36 #define MSR_ATAC_BASE 0x51300000 37 #define ATAC_GLD_MSR_CAP (MSR_ATAC_BASE+0) 38 #define ATAC_GLD_MSR_CONFIG (MSR_ATAC_BASE+0x01) 39 #define ATAC_GLD_MSR_SMI (MSR_ATAC_BASE+0x02) 40 #define ATAC_GLD_MSR_ERROR (MSR_ATAC_BASE+0x03) 41 #define ATAC_GLD_MSR_PM (MSR_ATAC_BASE+0x04) 42 #define ATAC_GLD_MSR_DIAG (MSR_ATAC_BASE+0x05) 43 #define ATAC_IO_BAR (MSR_ATAC_BASE+0x08) 44 #define ATAC_RESET (MSR_ATAC_BASE+0x10) 45 #define ATAC_CH0D0_PIO (MSR_ATAC_BASE+0x20) 46 #define ATAC_CH0D0_DMA (MSR_ATAC_BASE+0x21) 47 #define ATAC_CH0D1_PIO (MSR_ATAC_BASE+0x22) 48 #define ATAC_CH0D1_DMA (MSR_ATAC_BASE+0x23) 49 #define ATAC_PCI_ABRTERR (MSR_ATAC_BASE+0x24) 50 51 #define ATAC_BM0_CMD_PRIM 0x00 52 #define ATAC_BM0_STS_PRIM 0x02 53 #define ATAC_BM0_PRD 0x04 54 55 #define CS5535_CABLE_DETECT 0x48 56 57 /** 58 * cs5535_cable_detect - detect cable type 59 * @ap: Port to detect on 60 * 61 * Perform cable detection for ATA66 capable cable. Return a libata 62 * cable type. 63 */ 64 65 static int cs5535_cable_detect(struct ata_port *ap) 66 { 67 u8 cable; 68 struct pci_dev *pdev = to_pci_dev(ap->host->dev); 69 70 pci_read_config_byte(pdev, CS5535_CABLE_DETECT, &cable); 71 if (cable & 1) 72 return ATA_CBL_PATA80; 73 else 74 return ATA_CBL_PATA40; 75 } 76 77 /** 78 * cs5535_set_piomode - PIO setup 79 * @ap: ATA interface 80 * @adev: device on the interface 81 * 82 * Set our PIO requirements. The CS5535 is pretty clean about all this 83 */ 84 85 static void cs5535_set_piomode(struct ata_port *ap, struct ata_device *adev) 86 { 87 static const u16 pio_timings[5] = { 88 0xF7F4, 0xF173, 0x8141, 0x5131, 0x1131 89 }; 90 static const u16 pio_cmd_timings[5] = { 91 0xF7F4, 0x53F3, 0x13F1, 0x5131, 0x1131 92 }; 93 u32 reg, __maybe_unused dummy; 94 struct ata_device *pair = ata_dev_pair(adev); 95 96 int mode = adev->pio_mode - XFER_PIO_0; 97 int cmdmode = mode; 98 99 /* Command timing has to be for the lowest of the pair of devices */ 100 if (pair) { 101 int pairmode = pair->pio_mode - XFER_PIO_0; 102 cmdmode = min(mode, pairmode); 103 /* Write the other drive timing register if it changed */ 104 if (cmdmode < pairmode) 105 wrmsr(ATAC_CH0D0_PIO + 2 * pair->devno, 106 pio_cmd_timings[cmdmode] << 16 | pio_timings[pairmode], 0); 107 } 108 /* Write the drive timing register */ 109 wrmsr(ATAC_CH0D0_PIO + 2 * adev->devno, 110 pio_cmd_timings[cmdmode] << 16 | pio_timings[mode], 0); 111 112 /* Set the PIO "format 1" bit in the DMA timing register */ 113 rdmsr(ATAC_CH0D0_DMA + 2 * adev->devno, reg, dummy); 114 wrmsr(ATAC_CH0D0_DMA + 2 * adev->devno, reg | 0x80000000UL, 0); 115 } 116 117 /** 118 * cs5535_set_dmamode - DMA timing setup 119 * @ap: ATA interface 120 * @adev: Device being configured 121 * 122 */ 123 124 static void cs5535_set_dmamode(struct ata_port *ap, struct ata_device *adev) 125 { 126 static const u32 udma_timings[5] = { 127 0x7F7436A1, 0x7F733481, 0x7F723261, 0x7F713161, 0x7F703061 128 }; 129 static const u32 mwdma_timings[3] = { 130 0x7F0FFFF3, 0x7F035352, 0x7F024241 131 }; 132 u32 reg, __maybe_unused dummy; 133 int mode = adev->dma_mode; 134 135 rdmsr(ATAC_CH0D0_DMA + 2 * adev->devno, reg, dummy); 136 reg &= 0x80000000UL; 137 if (mode >= XFER_UDMA_0) 138 reg |= udma_timings[mode - XFER_UDMA_0]; 139 else 140 reg |= mwdma_timings[mode - XFER_MW_DMA_0]; 141 wrmsr(ATAC_CH0D0_DMA + 2 * adev->devno, reg, 0); 142 } 143 144 static const struct scsi_host_template cs5535_sht = { 145 ATA_BMDMA_SHT(DRV_NAME), 146 }; 147 148 static struct ata_port_operations cs5535_port_ops = { 149 .inherits = &ata_bmdma_port_ops, 150 .cable_detect = cs5535_cable_detect, 151 .set_piomode = cs5535_set_piomode, 152 .set_dmamode = cs5535_set_dmamode, 153 }; 154 155 /** 156 * cs5535_init_one - Initialise a CS5530 157 * @dev: PCI device 158 * @id: Entry in match table 159 * 160 * Install a driver for the newly found CS5530 companion chip. Most of 161 * this is just housekeeping. We have to set the chip up correctly and 162 * turn off various bits of emulation magic. 163 */ 164 165 static int cs5535_init_one(struct pci_dev *dev, const struct pci_device_id *id) 166 { 167 static const struct ata_port_info info = { 168 .flags = ATA_FLAG_SLAVE_POSS, 169 .pio_mask = ATA_PIO4, 170 .mwdma_mask = ATA_MWDMA2, 171 .udma_mask = ATA_UDMA4, 172 .port_ops = &cs5535_port_ops 173 }; 174 const struct ata_port_info *ppi[] = { &info, &ata_dummy_port_info }; 175 176 return ata_pci_bmdma_init_one(dev, ppi, &cs5535_sht, NULL, 0); 177 } 178 179 static const struct pci_device_id cs5535[] = { 180 { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_CS5535_IDE), }, 181 { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_CS5535_IDE), }, 182 183 { }, 184 }; 185 186 static struct pci_driver cs5535_pci_driver = { 187 .name = DRV_NAME, 188 .id_table = cs5535, 189 .probe = cs5535_init_one, 190 .remove = ata_pci_remove_one, 191 #ifdef CONFIG_PM_SLEEP 192 .suspend = ata_pci_device_suspend, 193 .resume = ata_pci_device_resume, 194 #endif 195 }; 196 197 module_pci_driver(cs5535_pci_driver); 198 199 MODULE_AUTHOR("Alan Cox, Jens Altmann, Wolfgan Zuleger, Alexander Kiausch"); 200 MODULE_DESCRIPTION("low-level driver for the NS/AMD 5535"); 201 MODULE_LICENSE("GPL"); 202 MODULE_DEVICE_TABLE(pci, cs5535); 203 MODULE_VERSION(DRV_VERSION); 204