2 * Palmchip bk3710 IDE controller
4 * Copyright (C) 2006 Texas Instruments.
5 * Copyright (C) 2007 MontaVista Software, Inc., <source@mvista.com>
7 * ----------------------------------------------------------------------------
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 * ----------------------------------------------------------------------------
26 #include <linux/types.h>
27 #include <linux/module.h>
28 #include <linux/kernel.h>
29 #include <linux/ioport.h>
30 #include <linux/ide.h>
31 #include <linux/delay.h>
32 #include <linux/init.h>
33 #include <linux/clk.h>
34 #include <linux/platform_device.h>
36 /* Offset of the primary interface registers */
37 #define IDE_PALM_ATA_PRI_REG_OFFSET 0x1F0
39 /* Primary Control Offset */
40 #define IDE_PALM_ATA_PRI_CTL_OFFSET 0x3F6
42 #define BK3710_BMICP 0x00
43 #define BK3710_BMISP 0x02
44 #define BK3710_BMIDTP 0x04
45 #define BK3710_IDETIMP 0x40
46 #define BK3710_IDESTATUS 0x47
47 #define BK3710_UDMACTL 0x48
48 #define BK3710_MISCCTL 0x50
49 #define BK3710_REGSTB 0x54
50 #define BK3710_REGRCVR 0x58
51 #define BK3710_DATSTB 0x5C
52 #define BK3710_DATRCVR 0x60
53 #define BK3710_DMASTB 0x64
54 #define BK3710_DMARCVR 0x68
55 #define BK3710_UDMASTB 0x6C
56 #define BK3710_UDMATRP 0x70
57 #define BK3710_UDMAENV 0x74
58 #define BK3710_IORDYTMP 0x78
60 static unsigned ideclk_period; /* in nanoseconds */
62 struct palm_bk3710_udmatiming {
63 unsigned int rptime; /* tRP -- Ready to pause time (nsec) */
64 unsigned int cycletime; /* tCYCTYP2/2 -- avg Cycle Time (nsec) */
65 /* tENV is always a minimum of 20 nsec */
68 static const struct palm_bk3710_udmatiming palm_bk3710_udmatimings[6] = {
69 { 160, 240 / 2 }, /* UDMA Mode 0 */
70 { 125, 160 / 2 }, /* UDMA Mode 1 */
71 { 100, 120 / 2 }, /* UDMA Mode 2 */
72 { 100, 90 / 2 }, /* UDMA Mode 3 */
73 { 100, 60 / 2 }, /* UDMA Mode 4 */
74 { 85, 40 / 2 }, /* UDMA Mode 5 */
77 static void palm_bk3710_setudmamode(void __iomem *base, unsigned int dev,
85 t0 = DIV_ROUND_UP(palm_bk3710_udmatimings[mode].cycletime,
87 tenv = DIV_ROUND_UP(20, ideclk_period) - 1;
88 trp = DIV_ROUND_UP(palm_bk3710_udmatimings[mode].rptime,
91 /* udmastb Ultra DMA Access Strobe Width */
92 val32 = readl(base + BK3710_UDMASTB) & (0xFF << (dev ? 0 : 8));
93 val32 |= (t0 << (dev ? 8 : 0));
94 writel(val32, base + BK3710_UDMASTB);
96 /* udmatrp Ultra DMA Ready to Pause Time */
97 val32 = readl(base + BK3710_UDMATRP) & (0xFF << (dev ? 0 : 8));
98 val32 |= (trp << (dev ? 8 : 0));
99 writel(val32, base + BK3710_UDMATRP);
101 /* udmaenv Ultra DMA envelop Time */
102 val32 = readl(base + BK3710_UDMAENV) & (0xFF << (dev ? 0 : 8));
103 val32 |= (tenv << (dev ? 8 : 0));
104 writel(val32, base + BK3710_UDMAENV);
106 /* Enable UDMA for Device */
107 val16 = readw(base + BK3710_UDMACTL) | (1 << dev);
108 writew(val16, base + BK3710_UDMACTL);
111 static void palm_bk3710_setdmamode(void __iomem *base, unsigned int dev,
112 unsigned short min_cycle,
118 struct ide_timing *t;
121 t = ide_timing_find_mode(mode);
122 cycletime = max_t(int, t->cycle, min_cycle);
125 t0 = DIV_ROUND_UP(cycletime, ideclk_period);
126 td = DIV_ROUND_UP(t->active, ideclk_period);
130 val32 = readl(base + BK3710_DMASTB) & (0xFF << (dev ? 0 : 8));
131 val32 |= (td << (dev ? 8 : 0));
132 writel(val32, base + BK3710_DMASTB);
134 val32 = readl(base + BK3710_DMARCVR) & (0xFF << (dev ? 0 : 8));
135 val32 |= (tkw << (dev ? 8 : 0));
136 writel(val32, base + BK3710_DMARCVR);
138 /* Disable UDMA for Device */
139 val16 = readw(base + BK3710_UDMACTL) & ~(1 << dev);
140 writew(val16, base + BK3710_UDMACTL);
143 static void palm_bk3710_setpiomode(void __iomem *base, ide_drive_t *mate,
144 unsigned int dev, unsigned int cycletime,
149 struct ide_timing *t;
151 t = ide_timing_find_mode(XFER_PIO_0 + mode);
154 t0 = DIV_ROUND_UP(cycletime, ideclk_period);
155 t2 = DIV_ROUND_UP(t->active, ideclk_period);
160 val32 = readl(base + BK3710_DATSTB) & (0xFF << (dev ? 0 : 8));
161 val32 |= (t2 << (dev ? 8 : 0));
162 writel(val32, base + BK3710_DATSTB);
164 val32 = readl(base + BK3710_DATRCVR) & (0xFF << (dev ? 0 : 8));
165 val32 |= (t2i << (dev ? 8 : 0));
166 writel(val32, base + BK3710_DATRCVR);
169 u8 mode2 = ide_get_best_pio_mode(mate, 255, 4);
176 t0 = DIV_ROUND_UP(t->cyc8b, ideclk_period);
177 t2 = DIV_ROUND_UP(t->act8b, ideclk_period);
182 val32 = readl(base + BK3710_REGSTB) & (0xFF << (dev ? 0 : 8));
183 val32 |= (t2 << (dev ? 8 : 0));
184 writel(val32, base + BK3710_REGSTB);
186 val32 = readl(base + BK3710_REGRCVR) & (0xFF << (dev ? 0 : 8));
187 val32 |= (t2i << (dev ? 8 : 0));
188 writel(val32, base + BK3710_REGRCVR);
191 static void palm_bk3710_set_dma_mode(ide_drive_t *drive, u8 xferspeed)
193 int is_slave = drive->dn & 1;
194 void __iomem *base = (void *)drive->hwif->dma_base;
196 if (xferspeed >= XFER_UDMA_0) {
197 palm_bk3710_setudmamode(base, is_slave,
198 xferspeed - XFER_UDMA_0);
200 palm_bk3710_setdmamode(base, is_slave,
201 drive->id[ATA_ID_EIDE_DMA_MIN],
206 static void palm_bk3710_set_pio_mode(ide_drive_t *drive, u8 pio)
208 unsigned int cycle_time;
209 int is_slave = drive->dn & 1;
211 void __iomem *base = (void *)drive->hwif->dma_base;
214 * Obtain the drive PIO data for tuning the Palm Chip registers
216 cycle_time = ide_pio_cycle_time(drive, pio);
217 mate = ide_get_pair_dev(drive);
218 palm_bk3710_setpiomode(base, mate, is_slave, cycle_time, pio);
221 static void __devinit palm_bk3710_chipinit(void __iomem *base)
224 * REVISIT: the ATA reset signal needs to be managed through a
225 * GPIO, which means it should come from platform_data. Until
226 * we get and use such information, we have to trust that things
227 * have been reset before we get here.
231 * Program the IDETIMP Register Value based on the following assumptions
233 * (ATA_IDETIMP_IDEEN , ENABLE ) |
234 * (ATA_IDETIMP_PREPOST1 , DISABLE) |
235 * (ATA_IDETIMP_PREPOST0 , DISABLE) |
237 * DM6446 silicon rev 2.1 and earlier have no observed net benefit
238 * from enabling prefetch/postwrite.
240 writew(BIT(15), base + BK3710_IDETIMP);
243 * UDMACTL Ultra-ATA DMA Control
244 * (ATA_UDMACTL_UDMAP1 , 0 ) |
245 * (ATA_UDMACTL_UDMAP0 , 0 )
248 writew(0, base + BK3710_UDMACTL);
251 * MISCCTL Miscellaneous Conrol Register
252 * (ATA_MISCCTL_HWNHLD1P , 1 cycle)
253 * (ATA_MISCCTL_HWNHLD0P , 1 cycle)
254 * (ATA_MISCCTL_TIMORIDE , 1)
256 writel(0x001, base + BK3710_MISCCTL);
259 * IORDYTMP IORDY Timer for Primary Register
260 * (ATA_IORDYTMP_IORDYTMP , 0xffff )
262 writel(0xFFFF, base + BK3710_IORDYTMP);
265 * Configure BMISP Register
266 * (ATA_BMISP_DMAEN1 , DISABLE ) |
267 * (ATA_BMISP_DMAEN0 , DISABLE ) |
268 * (ATA_BMISP_IORDYINT , CLEAR) |
269 * (ATA_BMISP_INTRSTAT , CLEAR) |
270 * (ATA_BMISP_DMAERROR , CLEAR)
272 writew(0, base + BK3710_BMISP);
274 palm_bk3710_setpiomode(base, NULL, 0, 600, 0);
275 palm_bk3710_setpiomode(base, NULL, 1, 600, 0);
278 static u8 palm_bk3710_cable_detect(ide_hwif_t *hwif)
280 return ATA_CBL_PATA80;
283 static int __devinit palm_bk3710_init_dma(ide_hwif_t *hwif,
284 const struct ide_port_info *d)
286 printk(KERN_INFO " %s: MMIO-DMA\n", hwif->name);
288 if (ide_allocate_dma_engine(hwif))
291 hwif->dma_base = hwif->io_ports.data_addr - IDE_PALM_ATA_PRI_REG_OFFSET;
296 static const struct ide_port_ops palm_bk3710_ports_ops = {
297 .set_pio_mode = palm_bk3710_set_pio_mode,
298 .set_dma_mode = palm_bk3710_set_dma_mode,
299 .cable_detect = palm_bk3710_cable_detect,
302 static struct ide_port_info __devinitdata palm_bk3710_port_info = {
303 .init_dma = palm_bk3710_init_dma,
304 .port_ops = &palm_bk3710_ports_ops,
305 .dma_ops = &sff_dma_ops,
306 .host_flags = IDE_HFLAG_MMIO,
307 .pio_mask = ATA_PIO4,
308 .mwdma_mask = ATA_MWDMA2,
309 .chipset = ide_palm3710,
312 static int __init palm_bk3710_probe(struct platform_device *pdev)
315 struct resource *mem, *irq;
317 unsigned long rate, mem_size;
319 struct ide_hw hw, *hws[] = { &hw };
321 clk = clk_get(&pdev->dev, "IDECLK");
326 rate = clk_get_rate(clk);
328 /* NOTE: round *down* to meet minimum timings; we count in clocks */
329 ideclk_period = 1000000000UL / rate;
331 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
333 printk(KERN_ERR "failed to get memory region resource\n");
337 irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
339 printk(KERN_ERR "failed to get IRQ resource\n");
343 mem_size = mem->end - mem->start + 1;
344 if (request_mem_region(mem->start, mem_size, "palm_bk3710") == NULL) {
345 printk(KERN_ERR "failed to request memory region\n");
349 base = ioremap(mem->start, mem_size);
351 printk(KERN_ERR "failed to map IO memory\n");
352 release_mem_region(mem->start, mem_size);
356 /* Configure the Palm Chip controller */
357 palm_bk3710_chipinit(base);
359 memset(&hw, 0, sizeof(hw));
360 for (i = 0; i < IDE_NR_PORTS - 2; i++)
361 hw.io_ports_array[i] = (unsigned long)
362 (base + IDE_PALM_ATA_PRI_REG_OFFSET + i);
363 hw.io_ports.ctl_addr = (unsigned long)
364 (base + IDE_PALM_ATA_PRI_CTL_OFFSET);
368 palm_bk3710_port_info.udma_mask = rate < 100000000 ? ATA_UDMA4 :
371 /* Register the IDE interface with Linux */
372 rc = ide_host_add(&palm_bk3710_port_info, hws, 1, NULL);
378 printk(KERN_WARNING "Palm Chip BK3710 IDE Register Fail\n");
382 /* work with hotplug and coldplug */
383 MODULE_ALIAS("platform:palm_bk3710");
385 static struct platform_driver platform_bk_driver = {
387 .name = "palm_bk3710",
388 .owner = THIS_MODULE,
392 static int __init palm_bk3710_init(void)
394 return platform_driver_probe(&platform_bk_driver, palm_bk3710_probe);
397 module_init(palm_bk3710_init);
398 MODULE_LICENSE("GPL");