1457c8996SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only
23764e82eSJohannes Thumshirn #include <linux/types.h>
33764e82eSJohannes Thumshirn #include <linux/ioport.h>
43764e82eSJohannes Thumshirn #include <linux/slab.h>
53764e82eSJohannes Thumshirn #include <linux/export.h>
63764e82eSJohannes Thumshirn #include <linux/io.h>
73764e82eSJohannes Thumshirn #include <linux/mcb.h>
83764e82eSJohannes Thumshirn
93764e82eSJohannes Thumshirn #include "mcb-internal.h"
103764e82eSJohannes Thumshirn
113764e82eSJohannes Thumshirn #define for_each_chameleon_cell(dtype, p) \
123764e82eSJohannes Thumshirn for ((dtype) = get_next_dtype((p)); \
133764e82eSJohannes Thumshirn (dtype) != CHAMELEON_DTYPE_END; \
143764e82eSJohannes Thumshirn (dtype) = get_next_dtype((p)))
153764e82eSJohannes Thumshirn
get_next_dtype(void __iomem * p)163764e82eSJohannes Thumshirn static inline uint32_t get_next_dtype(void __iomem *p)
173764e82eSJohannes Thumshirn {
183764e82eSJohannes Thumshirn uint32_t dtype;
193764e82eSJohannes Thumshirn
203764e82eSJohannes Thumshirn dtype = readl(p);
213764e82eSJohannes Thumshirn return dtype >> 28;
223764e82eSJohannes Thumshirn }
233764e82eSJohannes Thumshirn
chameleon_parse_bdd(struct mcb_bus * bus,struct chameleon_bar * cb,void __iomem * base)243764e82eSJohannes Thumshirn static int chameleon_parse_bdd(struct mcb_bus *bus,
25ffc7bb38SAndreas Werner struct chameleon_bar *cb,
263764e82eSJohannes Thumshirn void __iomem *base)
273764e82eSJohannes Thumshirn {
283764e82eSJohannes Thumshirn return 0;
293764e82eSJohannes Thumshirn }
303764e82eSJohannes Thumshirn
chameleon_parse_gdd(struct mcb_bus * bus,struct chameleon_bar * cb,void __iomem * base,int bar_count)313764e82eSJohannes Thumshirn static int chameleon_parse_gdd(struct mcb_bus *bus,
32ffc7bb38SAndreas Werner struct chameleon_bar *cb,
33ffc7bb38SAndreas Werner void __iomem *base, int bar_count)
343764e82eSJohannes Thumshirn {
353764e82eSJohannes Thumshirn struct chameleon_gdd __iomem *gdd =
363764e82eSJohannes Thumshirn (struct chameleon_gdd __iomem *) base;
373764e82eSJohannes Thumshirn struct mcb_device *mdev;
38ffc7bb38SAndreas Werner u32 dev_mapbase;
393764e82eSJohannes Thumshirn u32 offset;
403764e82eSJohannes Thumshirn u32 size;
413764e82eSJohannes Thumshirn int ret;
423764e82eSJohannes Thumshirn __le32 reg1;
433764e82eSJohannes Thumshirn __le32 reg2;
443764e82eSJohannes Thumshirn
453764e82eSJohannes Thumshirn mdev = mcb_alloc_dev(bus);
463764e82eSJohannes Thumshirn if (!mdev)
473764e82eSJohannes Thumshirn return -ENOMEM;
483764e82eSJohannes Thumshirn
493764e82eSJohannes Thumshirn reg1 = readl(&gdd->reg1);
503764e82eSJohannes Thumshirn reg2 = readl(&gdd->reg2);
513764e82eSJohannes Thumshirn offset = readl(&gdd->offset);
523764e82eSJohannes Thumshirn size = readl(&gdd->size);
533764e82eSJohannes Thumshirn
543764e82eSJohannes Thumshirn mdev->id = GDD_DEV(reg1);
553764e82eSJohannes Thumshirn mdev->rev = GDD_REV(reg1);
563764e82eSJohannes Thumshirn mdev->var = GDD_VAR(reg1);
57f75564d3SAndreas Werner mdev->bar = GDD_BAR(reg2);
583764e82eSJohannes Thumshirn mdev->group = GDD_GRP(reg2);
593764e82eSJohannes Thumshirn mdev->inst = GDD_INS(reg2);
603764e82eSJohannes Thumshirn
61ffc7bb38SAndreas Werner /*
62ffc7bb38SAndreas Werner * If the BAR is missing, dev_mapbase is zero, or if the
63ffc7bb38SAndreas Werner * device is IO mapped we just print a warning and go on with the
64ffc7bb38SAndreas Werner * next device, instead of completely stop the gdd parser
65ffc7bb38SAndreas Werner */
66ffc7bb38SAndreas Werner if (mdev->bar > bar_count - 1) {
67ffc7bb38SAndreas Werner pr_info("No BAR for 16z%03d\n", mdev->id);
68ffc7bb38SAndreas Werner ret = 0;
69ffc7bb38SAndreas Werner goto err;
70ffc7bb38SAndreas Werner }
71ffc7bb38SAndreas Werner
72ffc7bb38SAndreas Werner dev_mapbase = cb[mdev->bar].addr;
73ffc7bb38SAndreas Werner if (!dev_mapbase) {
74ffc7bb38SAndreas Werner pr_info("BAR not assigned for 16z%03d\n", mdev->id);
75ffc7bb38SAndreas Werner ret = 0;
76ffc7bb38SAndreas Werner goto err;
77ffc7bb38SAndreas Werner }
78ffc7bb38SAndreas Werner
79ffc7bb38SAndreas Werner if (dev_mapbase & 0x01) {
80ffc7bb38SAndreas Werner pr_info("IO mapped Device (16z%03d) not yet supported\n",
81ffc7bb38SAndreas Werner mdev->id);
82ffc7bb38SAndreas Werner ret = 0;
83ffc7bb38SAndreas Werner goto err;
84ffc7bb38SAndreas Werner }
85ffc7bb38SAndreas Werner
863764e82eSJohannes Thumshirn pr_debug("Found a 16z%03d\n", mdev->id);
873764e82eSJohannes Thumshirn
883764e82eSJohannes Thumshirn mdev->irq.start = GDD_IRQ(reg1);
893764e82eSJohannes Thumshirn mdev->irq.end = GDD_IRQ(reg1);
903764e82eSJohannes Thumshirn mdev->irq.flags = IORESOURCE_IRQ;
913764e82eSJohannes Thumshirn
92ffc7bb38SAndreas Werner mdev->mem.start = dev_mapbase + offset;
93ffc7bb38SAndreas Werner
943764e82eSJohannes Thumshirn mdev->mem.end = mdev->mem.start + size - 1;
953764e82eSJohannes Thumshirn mdev->mem.flags = IORESOURCE_MEM;
963764e82eSJohannes Thumshirn
973764e82eSJohannes Thumshirn ret = mcb_device_register(bus, mdev);
983764e82eSJohannes Thumshirn if (ret < 0)
993764e82eSJohannes Thumshirn goto err;
1003764e82eSJohannes Thumshirn
1013764e82eSJohannes Thumshirn return 0;
1023764e82eSJohannes Thumshirn
1033764e82eSJohannes Thumshirn err:
104*63ba2d07SSanjuán García, Jorge mcb_free_dev(mdev);
1053764e82eSJohannes Thumshirn
1063764e82eSJohannes Thumshirn return ret;
1073764e82eSJohannes Thumshirn }
1083764e82eSJohannes Thumshirn
chameleon_parse_bar(void __iomem * base,struct chameleon_bar * cb,int bar_count)109ffc7bb38SAndreas Werner static void chameleon_parse_bar(void __iomem *base,
110ffc7bb38SAndreas Werner struct chameleon_bar *cb, int bar_count)
111ffc7bb38SAndreas Werner {
112ffc7bb38SAndreas Werner char __iomem *p = base;
113ffc7bb38SAndreas Werner int i;
114ffc7bb38SAndreas Werner
115ffc7bb38SAndreas Werner /* skip reg1 */
116ffc7bb38SAndreas Werner p += sizeof(__le32);
117ffc7bb38SAndreas Werner
118ffc7bb38SAndreas Werner for (i = 0; i < bar_count; i++) {
119ffc7bb38SAndreas Werner cb[i].addr = readl(p);
120ffc7bb38SAndreas Werner cb[i].size = readl(p + 4);
121ffc7bb38SAndreas Werner
122ffc7bb38SAndreas Werner p += sizeof(struct chameleon_bar);
123ffc7bb38SAndreas Werner }
124ffc7bb38SAndreas Werner }
125ffc7bb38SAndreas Werner
chameleon_get_bar(void __iomem ** base,phys_addr_t mapbase,struct chameleon_bar ** cb)126a889c276SRodríguez Barbarin, José Javier static int chameleon_get_bar(void __iomem **base, phys_addr_t mapbase,
127ffc7bb38SAndreas Werner struct chameleon_bar **cb)
128ffc7bb38SAndreas Werner {
129ffc7bb38SAndreas Werner struct chameleon_bar *c;
130ffc7bb38SAndreas Werner int bar_count;
131ffc7bb38SAndreas Werner __le32 reg;
132ffc7bb38SAndreas Werner u32 dtype;
133ffc7bb38SAndreas Werner
134ffc7bb38SAndreas Werner /*
135ffc7bb38SAndreas Werner * For those devices which are not connected
136ffc7bb38SAndreas Werner * to the PCI Bus (e.g. LPC) there is a bar
137ffc7bb38SAndreas Werner * descriptor located directly after the
138ffc7bb38SAndreas Werner * chameleon header. This header is comparable
139ffc7bb38SAndreas Werner * to a PCI header.
140ffc7bb38SAndreas Werner */
141ffc7bb38SAndreas Werner dtype = get_next_dtype(*base);
142ffc7bb38SAndreas Werner if (dtype == CHAMELEON_DTYPE_BAR) {
143ffc7bb38SAndreas Werner reg = readl(*base);
144ffc7bb38SAndreas Werner
145ffc7bb38SAndreas Werner bar_count = BAR_CNT(reg);
146c836790aSMichael Moese if (bar_count <= 0 || bar_count > CHAMELEON_BAR_MAX)
147ffc7bb38SAndreas Werner return -ENODEV;
148ffc7bb38SAndreas Werner
149ffc7bb38SAndreas Werner c = kcalloc(bar_count, sizeof(struct chameleon_bar),
150ffc7bb38SAndreas Werner GFP_KERNEL);
151ffc7bb38SAndreas Werner if (!c)
152ffc7bb38SAndreas Werner return -ENOMEM;
153ffc7bb38SAndreas Werner
154ffc7bb38SAndreas Werner chameleon_parse_bar(*base, c, bar_count);
155ffc7bb38SAndreas Werner *base += BAR_DESC_SIZE(bar_count);
156ffc7bb38SAndreas Werner } else {
157ffc7bb38SAndreas Werner c = kzalloc(sizeof(struct chameleon_bar), GFP_KERNEL);
158ffc7bb38SAndreas Werner if (!c)
159ffc7bb38SAndreas Werner return -ENOMEM;
160ffc7bb38SAndreas Werner
161ffc7bb38SAndreas Werner bar_count = 1;
162ffc7bb38SAndreas Werner c->addr = mapbase;
163ffc7bb38SAndreas Werner }
164ffc7bb38SAndreas Werner
165ffc7bb38SAndreas Werner *cb = c;
166ffc7bb38SAndreas Werner
167ffc7bb38SAndreas Werner return bar_count;
168ffc7bb38SAndreas Werner }
169ffc7bb38SAndreas Werner
chameleon_parse_cells(struct mcb_bus * bus,phys_addr_t mapbase,void __iomem * base)1703764e82eSJohannes Thumshirn int chameleon_parse_cells(struct mcb_bus *bus, phys_addr_t mapbase,
1713764e82eSJohannes Thumshirn void __iomem *base)
1723764e82eSJohannes Thumshirn {
1733764e82eSJohannes Thumshirn struct chameleon_fpga_header *header;
174ffc7bb38SAndreas Werner struct chameleon_bar *cb;
175a889c276SRodríguez Barbarin, José Javier void __iomem *p = base;
1763764e82eSJohannes Thumshirn int num_cells = 0;
177ffc7bb38SAndreas Werner uint32_t dtype;
178ffc7bb38SAndreas Werner int bar_count;
1795ec6bff1SChristophe JAILLET int ret;
1803764e82eSJohannes Thumshirn u32 hsize;
181a889c276SRodríguez Barbarin, José Javier u32 table_size;
1823764e82eSJohannes Thumshirn
1833764e82eSJohannes Thumshirn hsize = sizeof(struct chameleon_fpga_header);
1843764e82eSJohannes Thumshirn
1853764e82eSJohannes Thumshirn header = kzalloc(hsize, GFP_KERNEL);
1863764e82eSJohannes Thumshirn if (!header)
1873764e82eSJohannes Thumshirn return -ENOMEM;
1883764e82eSJohannes Thumshirn
1893764e82eSJohannes Thumshirn /* Extract header information */
1903764e82eSJohannes Thumshirn memcpy_fromio(header, p, hsize);
1913764e82eSJohannes Thumshirn /* We only support chameleon v2 at the moment */
1923764e82eSJohannes Thumshirn header->magic = le16_to_cpu(header->magic);
1933764e82eSJohannes Thumshirn if (header->magic != CHAMELEONV2_MAGIC) {
1943764e82eSJohannes Thumshirn pr_err("Unsupported chameleon version 0x%x\n",
1953764e82eSJohannes Thumshirn header->magic);
196ffc7bb38SAndreas Werner ret = -ENODEV;
197ffc7bb38SAndreas Werner goto free_header;
1983764e82eSJohannes Thumshirn }
1993764e82eSJohannes Thumshirn p += hsize;
2003764e82eSJohannes Thumshirn
201803f1ca6SJohannes Thumshirn bus->revision = header->revision;
202803f1ca6SJohannes Thumshirn bus->model = header->model;
203803f1ca6SJohannes Thumshirn bus->minor = header->minor;
204803f1ca6SJohannes Thumshirn snprintf(bus->name, CHAMELEON_FILENAME_LEN + 1, "%s",
2053764e82eSJohannes Thumshirn header->filename);
2063764e82eSJohannes Thumshirn
207ffc7bb38SAndreas Werner bar_count = chameleon_get_bar(&p, mapbase, &cb);
2085ec6bff1SChristophe JAILLET if (bar_count < 0) {
2095ec6bff1SChristophe JAILLET ret = bar_count;
210ffc7bb38SAndreas Werner goto free_header;
2115ec6bff1SChristophe JAILLET }
212ffc7bb38SAndreas Werner
2133764e82eSJohannes Thumshirn for_each_chameleon_cell(dtype, p) {
2143764e82eSJohannes Thumshirn switch (dtype) {
2153764e82eSJohannes Thumshirn case CHAMELEON_DTYPE_GENERAL:
216ffc7bb38SAndreas Werner ret = chameleon_parse_gdd(bus, cb, p, bar_count);
2173764e82eSJohannes Thumshirn if (ret < 0)
218ffc7bb38SAndreas Werner goto free_bar;
2193764e82eSJohannes Thumshirn p += sizeof(struct chameleon_gdd);
2203764e82eSJohannes Thumshirn break;
2213764e82eSJohannes Thumshirn case CHAMELEON_DTYPE_BRIDGE:
222ffc7bb38SAndreas Werner chameleon_parse_bdd(bus, cb, p);
2233764e82eSJohannes Thumshirn p += sizeof(struct chameleon_bdd);
2243764e82eSJohannes Thumshirn break;
2253764e82eSJohannes Thumshirn case CHAMELEON_DTYPE_END:
2263764e82eSJohannes Thumshirn break;
2273764e82eSJohannes Thumshirn default:
2283764e82eSJohannes Thumshirn pr_err("Invalid chameleon descriptor type 0x%x\n",
2293764e82eSJohannes Thumshirn dtype);
230ffc7bb38SAndreas Werner ret = -EINVAL;
231ffc7bb38SAndreas Werner goto free_bar;
2323764e82eSJohannes Thumshirn }
2333764e82eSJohannes Thumshirn num_cells++;
2343764e82eSJohannes Thumshirn }
2353764e82eSJohannes Thumshirn
236a889c276SRodríguez Barbarin, José Javier if (num_cells == 0) {
237a889c276SRodríguez Barbarin, José Javier ret = -EINVAL;
238a889c276SRodríguez Barbarin, José Javier goto free_bar;
239a889c276SRodríguez Barbarin, José Javier }
2403764e82eSJohannes Thumshirn
241a889c276SRodríguez Barbarin, José Javier table_size = p - base;
242a889c276SRodríguez Barbarin, José Javier pr_debug("%d cell(s) found. Chameleon table size: 0x%04x bytes\n", num_cells, table_size);
243ffc7bb38SAndreas Werner kfree(cb);
2443764e82eSJohannes Thumshirn kfree(header);
245a889c276SRodríguez Barbarin, José Javier return table_size;
2463764e82eSJohannes Thumshirn
247ffc7bb38SAndreas Werner free_bar:
248ffc7bb38SAndreas Werner kfree(cb);
249ffc7bb38SAndreas Werner free_header:
2503764e82eSJohannes Thumshirn kfree(header);
251ffc7bb38SAndreas Werner
2523764e82eSJohannes Thumshirn return ret;
2533764e82eSJohannes Thumshirn }
254891e6036SJohannes Thumshirn EXPORT_SYMBOL_NS_GPL(chameleon_parse_cells, MCB);
255