1 /* 2 * Freescale iMX PATA driver 3 * 4 * Copyright (C) 2011 Arnaud Patard <arnaud.patard@rtp-net.org> 5 * 6 * Based on pata_platform - Copyright (C) 2006 - 2007 Paul Mundt 7 * 8 * This file is subject to the terms and conditions of the GNU General Public 9 * License. See the file "COPYING" in the main directory of this archive 10 * for more details. 11 * 12 * TODO: 13 * - dmaengine support 14 */ 15 16 #include <linux/ata.h> 17 #include <linux/clk.h> 18 #include <linux/libata.h> 19 #include <linux/module.h> 20 #include <linux/mod_devicetable.h> 21 #include <linux/platform_device.h> 22 23 #define DRV_NAME "pata_imx" 24 25 #define PATA_IMX_ATA_TIME_OFF 0x00 26 #define PATA_IMX_ATA_TIME_ON 0x01 27 #define PATA_IMX_ATA_TIME_1 0x02 28 #define PATA_IMX_ATA_TIME_2W 0x03 29 #define PATA_IMX_ATA_TIME_2R 0x04 30 #define PATA_IMX_ATA_TIME_AX 0x05 31 #define PATA_IMX_ATA_TIME_PIO_RDX 0x06 32 #define PATA_IMX_ATA_TIME_4 0x07 33 #define PATA_IMX_ATA_TIME_9 0x08 34 35 #define PATA_IMX_ATA_CONTROL 0x24 36 #define PATA_IMX_ATA_CTRL_FIFO_RST_B (1<<7) 37 #define PATA_IMX_ATA_CTRL_ATA_RST_B (1<<6) 38 #define PATA_IMX_ATA_CTRL_IORDY_EN (1<<0) 39 #define PATA_IMX_ATA_INT_EN 0x2C 40 #define PATA_IMX_ATA_INTR_ATA_INTRQ2 (1<<3) 41 #define PATA_IMX_DRIVE_DATA 0xA0 42 #define PATA_IMX_DRIVE_CONTROL 0xD8 43 44 static u32 pio_t4[] = { 30, 20, 15, 10, 10 }; 45 static u32 pio_t9[] = { 20, 15, 10, 10, 10 }; 46 static u32 pio_tA[] = { 35, 35, 35, 35, 35 }; 47 48 struct pata_imx_priv { 49 struct clk *clk; 50 /* timings/interrupt/control regs */ 51 void __iomem *host_regs; 52 u32 ata_ctl; 53 }; 54 55 static void pata_imx_set_timing(struct ata_device *adev, 56 struct pata_imx_priv *priv) 57 { 58 struct ata_timing timing; 59 unsigned long clkrate; 60 u32 T, mode; 61 62 clkrate = clk_get_rate(priv->clk); 63 64 if (adev->pio_mode < XFER_PIO_0 || adev->pio_mode > XFER_PIO_4 || 65 !clkrate) 66 return; 67 68 T = 1000000000 / clkrate; 69 ata_timing_compute(adev, adev->pio_mode, &timing, T * 1000, 0); 70 71 mode = adev->pio_mode - XFER_PIO_0; 72 73 writeb(3, priv->host_regs + PATA_IMX_ATA_TIME_OFF); 74 writeb(3, priv->host_regs + PATA_IMX_ATA_TIME_ON); 75 writeb(timing.setup, priv->host_regs + PATA_IMX_ATA_TIME_1); 76 writeb(timing.act8b, priv->host_regs + PATA_IMX_ATA_TIME_2W); 77 writeb(timing.act8b, priv->host_regs + PATA_IMX_ATA_TIME_2R); 78 writeb(1, priv->host_regs + PATA_IMX_ATA_TIME_PIO_RDX); 79 80 writeb(pio_t4[mode] / T + 1, priv->host_regs + PATA_IMX_ATA_TIME_4); 81 writeb(pio_t9[mode] / T + 1, priv->host_regs + PATA_IMX_ATA_TIME_9); 82 writeb(pio_tA[mode] / T + 1, priv->host_regs + PATA_IMX_ATA_TIME_AX); 83 } 84 85 static void pata_imx_set_piomode(struct ata_port *ap, struct ata_device *adev) 86 { 87 struct pata_imx_priv *priv = ap->host->private_data; 88 u32 val; 89 90 pata_imx_set_timing(adev, priv); 91 92 val = __raw_readl(priv->host_regs + PATA_IMX_ATA_CONTROL); 93 if (ata_pio_need_iordy(adev)) 94 val |= PATA_IMX_ATA_CTRL_IORDY_EN; 95 else 96 val &= ~PATA_IMX_ATA_CTRL_IORDY_EN; 97 __raw_writel(val, priv->host_regs + PATA_IMX_ATA_CONTROL); 98 } 99 100 static const struct scsi_host_template pata_imx_sht = { 101 ATA_PIO_SHT(DRV_NAME), 102 }; 103 104 static struct ata_port_operations pata_imx_port_ops = { 105 .inherits = &ata_sff_port_ops, 106 .sff_data_xfer = ata_sff_data_xfer32, 107 .cable_detect = ata_cable_unknown, 108 .set_piomode = pata_imx_set_piomode, 109 }; 110 111 static void pata_imx_setup_port(struct ata_ioports *ioaddr) 112 { 113 /* Fixup the port shift for platforms that need it */ 114 ioaddr->data_addr = ioaddr->cmd_addr + (ATA_REG_DATA << 2); 115 ioaddr->error_addr = ioaddr->cmd_addr + (ATA_REG_ERR << 2); 116 ioaddr->feature_addr = ioaddr->cmd_addr + (ATA_REG_FEATURE << 2); 117 ioaddr->nsect_addr = ioaddr->cmd_addr + (ATA_REG_NSECT << 2); 118 ioaddr->lbal_addr = ioaddr->cmd_addr + (ATA_REG_LBAL << 2); 119 ioaddr->lbam_addr = ioaddr->cmd_addr + (ATA_REG_LBAM << 2); 120 ioaddr->lbah_addr = ioaddr->cmd_addr + (ATA_REG_LBAH << 2); 121 ioaddr->device_addr = ioaddr->cmd_addr + (ATA_REG_DEVICE << 2); 122 ioaddr->status_addr = ioaddr->cmd_addr + (ATA_REG_STATUS << 2); 123 ioaddr->command_addr = ioaddr->cmd_addr + (ATA_REG_CMD << 2); 124 } 125 126 static int pata_imx_probe(struct platform_device *pdev) 127 { 128 struct ata_host *host; 129 struct ata_port *ap; 130 struct pata_imx_priv *priv; 131 int irq = 0; 132 struct resource *io_res; 133 int ret; 134 135 irq = platform_get_irq(pdev, 0); 136 if (irq < 0) 137 return irq; 138 139 priv = devm_kzalloc(&pdev->dev, 140 sizeof(struct pata_imx_priv), GFP_KERNEL); 141 if (!priv) 142 return -ENOMEM; 143 144 priv->clk = devm_clk_get_enabled(&pdev->dev, NULL); 145 if (IS_ERR(priv->clk)) { 146 dev_err(&pdev->dev, "Failed to get and enable clock\n"); 147 return PTR_ERR(priv->clk); 148 } 149 150 host = ata_host_alloc(&pdev->dev, 1); 151 if (!host) 152 return -ENOMEM; 153 154 host->private_data = priv; 155 ap = host->ports[0]; 156 157 ap->ops = &pata_imx_port_ops; 158 ap->pio_mask = ATA_PIO4; 159 ap->flags |= ATA_FLAG_SLAVE_POSS; 160 161 priv->host_regs = devm_platform_get_and_ioremap_resource(pdev, 0, &io_res); 162 if (IS_ERR(priv->host_regs)) 163 return PTR_ERR(priv->host_regs); 164 165 ap->ioaddr.cmd_addr = priv->host_regs + PATA_IMX_DRIVE_DATA; 166 ap->ioaddr.ctl_addr = priv->host_regs + PATA_IMX_DRIVE_CONTROL; 167 168 ap->ioaddr.altstatus_addr = ap->ioaddr.ctl_addr; 169 170 pata_imx_setup_port(&ap->ioaddr); 171 172 ata_port_desc(ap, "cmd 0x%llx ctl 0x%llx", 173 (unsigned long long)io_res->start + PATA_IMX_DRIVE_DATA, 174 (unsigned long long)io_res->start + PATA_IMX_DRIVE_CONTROL); 175 176 /* deassert resets */ 177 __raw_writel(PATA_IMX_ATA_CTRL_FIFO_RST_B | 178 PATA_IMX_ATA_CTRL_ATA_RST_B, 179 priv->host_regs + PATA_IMX_ATA_CONTROL); 180 /* enable interrupts */ 181 __raw_writel(PATA_IMX_ATA_INTR_ATA_INTRQ2, 182 priv->host_regs + PATA_IMX_ATA_INT_EN); 183 184 /* activate */ 185 ret = ata_host_activate(host, irq, ata_sff_interrupt, 0, 186 &pata_imx_sht); 187 188 if (ret) 189 return ret; 190 191 return 0; 192 } 193 194 static void pata_imx_remove(struct platform_device *pdev) 195 { 196 struct ata_host *host = platform_get_drvdata(pdev); 197 struct pata_imx_priv *priv = host->private_data; 198 199 ata_host_detach(host); 200 201 __raw_writel(0, priv->host_regs + PATA_IMX_ATA_INT_EN); 202 } 203 204 #ifdef CONFIG_PM_SLEEP 205 static int pata_imx_suspend(struct device *dev) 206 { 207 struct ata_host *host = dev_get_drvdata(dev); 208 struct pata_imx_priv *priv = host->private_data; 209 210 ata_host_suspend(host, PMSG_SUSPEND); 211 212 __raw_writel(0, priv->host_regs + PATA_IMX_ATA_INT_EN); 213 priv->ata_ctl = __raw_readl(priv->host_regs + PATA_IMX_ATA_CONTROL); 214 clk_disable_unprepare(priv->clk); 215 216 return 0; 217 } 218 219 static int pata_imx_resume(struct device *dev) 220 { 221 struct ata_host *host = dev_get_drvdata(dev); 222 struct pata_imx_priv *priv = host->private_data; 223 224 int ret = clk_prepare_enable(priv->clk); 225 if (ret) 226 return ret; 227 228 __raw_writel(priv->ata_ctl, priv->host_regs + PATA_IMX_ATA_CONTROL); 229 230 __raw_writel(PATA_IMX_ATA_INTR_ATA_INTRQ2, 231 priv->host_regs + PATA_IMX_ATA_INT_EN); 232 233 ata_host_resume(host); 234 235 return 0; 236 } 237 #endif 238 239 static SIMPLE_DEV_PM_OPS(pata_imx_pm_ops, pata_imx_suspend, pata_imx_resume); 240 241 static const struct of_device_id imx_pata_dt_ids[] = { 242 { 243 .compatible = "fsl,imx27-pata", 244 }, { 245 /* sentinel */ 246 } 247 }; 248 MODULE_DEVICE_TABLE(of, imx_pata_dt_ids); 249 250 static struct platform_driver pata_imx_driver = { 251 .probe = pata_imx_probe, 252 .remove = pata_imx_remove, 253 .driver = { 254 .name = DRV_NAME, 255 .of_match_table = imx_pata_dt_ids, 256 .pm = &pata_imx_pm_ops, 257 }, 258 }; 259 260 module_platform_driver(pata_imx_driver); 261 262 MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>"); 263 MODULE_DESCRIPTION("low-level driver for iMX PATA"); 264 MODULE_LICENSE("GPL"); 265 MODULE_ALIAS("platform:" DRV_NAME); 266