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9#include <linux/bitops.h>
10#include <linux/module.h>
11#include <linux/pci.h>
12#include <linux/rational.h>
13
14#include <linux/dmaengine.h>
15#include <linux/dma/dw.h>
16
17#include "8250.h"
18
19#define PCI_DEVICE_ID_INTEL_QRK_UARTx 0x0936
20
21#define PCI_DEVICE_ID_INTEL_BYT_UART1 0x0f0a
22#define PCI_DEVICE_ID_INTEL_BYT_UART2 0x0f0c
23
24#define PCI_DEVICE_ID_INTEL_BSW_UART1 0x228a
25#define PCI_DEVICE_ID_INTEL_BSW_UART2 0x228c
26
27#define PCI_DEVICE_ID_INTEL_BDW_UART1 0x9ce3
28#define PCI_DEVICE_ID_INTEL_BDW_UART2 0x9ce4
29
30
31
32#define BYT_PRV_CLK 0x800
33#define BYT_PRV_CLK_EN BIT(0)
34#define BYT_PRV_CLK_M_VAL_SHIFT 1
35#define BYT_PRV_CLK_N_VAL_SHIFT 16
36#define BYT_PRV_CLK_UPDATE BIT(31)
37
38#define BYT_TX_OVF_INT 0x820
39#define BYT_TX_OVF_INT_MASK BIT(1)
40
41struct lpss8250;
42
43struct lpss8250_board {
44 unsigned long freq;
45 unsigned int base_baud;
46 int (*setup)(struct lpss8250 *, struct uart_port *p);
47 void (*exit)(struct lpss8250 *);
48};
49
50struct lpss8250 {
51 int line;
52 struct lpss8250_board *board;
53
54
55 struct uart_8250_dma dma;
56 struct dw_dma_chip dma_chip;
57 struct dw_dma_slave dma_param;
58 u8 dma_maxburst;
59};
60
61static void byt_set_termios(struct uart_port *p, struct ktermios *termios,
62 struct ktermios *old)
63{
64 unsigned int baud = tty_termios_baud_rate(termios);
65 struct lpss8250 *lpss = p->private_data;
66 unsigned long fref = lpss->board->freq, fuart = baud * 16;
67 unsigned long w = BIT(15) - 1;
68 unsigned long m, n;
69 u32 reg;
70
71
72 fuart = fuart ? fuart : 9600 * 16;
73
74
75 fuart *= rounddown_pow_of_two(fref / fuart);
76
77
78
79
80
81
82
83 rational_best_approximation(fuart, fref, w, w, &m, &n);
84 p->uartclk = fuart;
85
86
87 reg = (m << BYT_PRV_CLK_M_VAL_SHIFT) | (n << BYT_PRV_CLK_N_VAL_SHIFT);
88 writel(reg, p->membase + BYT_PRV_CLK);
89 reg |= BYT_PRV_CLK_EN | BYT_PRV_CLK_UPDATE;
90 writel(reg, p->membase + BYT_PRV_CLK);
91
92 p->status &= ~UPSTAT_AUTOCTS;
93 if (termios->c_cflag & CRTSCTS)
94 p->status |= UPSTAT_AUTOCTS;
95
96 serial8250_do_set_termios(p, termios, old);
97}
98
99static unsigned int byt_get_mctrl(struct uart_port *port)
100{
101 unsigned int ret = serial8250_do_get_mctrl(port);
102
103
104 ret |= TIOCM_CAR | TIOCM_DSR;
105
106 return ret;
107}
108
109static int byt_serial_setup(struct lpss8250 *lpss, struct uart_port *port)
110{
111 struct dw_dma_slave *param = &lpss->dma_param;
112 struct uart_8250_port *up = up_to_u8250p(port);
113 struct pci_dev *pdev = to_pci_dev(port->dev);
114 unsigned int dma_devfn = PCI_DEVFN(PCI_SLOT(pdev->devfn), 0);
115 struct pci_dev *dma_dev = pci_get_slot(pdev->bus, dma_devfn);
116
117 switch (pdev->device) {
118 case PCI_DEVICE_ID_INTEL_BYT_UART1:
119 case PCI_DEVICE_ID_INTEL_BSW_UART1:
120 case PCI_DEVICE_ID_INTEL_BDW_UART1:
121 param->src_id = 3;
122 param->dst_id = 2;
123 break;
124 case PCI_DEVICE_ID_INTEL_BYT_UART2:
125 case PCI_DEVICE_ID_INTEL_BSW_UART2:
126 case PCI_DEVICE_ID_INTEL_BDW_UART2:
127 param->src_id = 5;
128 param->dst_id = 4;
129 break;
130 default:
131 return -EINVAL;
132 }
133
134 param->dma_dev = &dma_dev->dev;
135 param->m_master = 0;
136 param->p_master = 1;
137
138
139 port->fifosize = 64;
140 up->tx_loadsz = 64;
141
142 lpss->dma_maxburst = 16;
143
144 port->set_termios = byt_set_termios;
145 port->get_mctrl = byt_get_mctrl;
146
147
148 writel(BYT_TX_OVF_INT_MASK, port->membase + BYT_TX_OVF_INT);
149
150 return 0;
151}
152
153#ifdef CONFIG_SERIAL_8250_DMA
154static const struct dw_dma_platform_data qrk_serial_dma_pdata = {
155 .nr_channels = 2,
156 .chan_allocation_order = CHAN_ALLOCATION_ASCENDING,
157 .chan_priority = CHAN_PRIORITY_ASCENDING,
158 .block_size = 4095,
159 .nr_masters = 1,
160 .data_width = {4},
161 .multi_block = {0},
162};
163
164static void qrk_serial_setup_dma(struct lpss8250 *lpss, struct uart_port *port)
165{
166 struct uart_8250_dma *dma = &lpss->dma;
167 struct dw_dma_chip *chip = &lpss->dma_chip;
168 struct dw_dma_slave *param = &lpss->dma_param;
169 struct pci_dev *pdev = to_pci_dev(port->dev);
170 int ret;
171
172 chip->dev = &pdev->dev;
173 chip->irq = pci_irq_vector(pdev, 0);
174 chip->regs = pci_ioremap_bar(pdev, 1);
175 chip->pdata = &qrk_serial_dma_pdata;
176
177
178 ret = dw_dma_probe(chip);
179 if (ret)
180 return;
181
182 pci_try_set_mwi(pdev);
183
184
185 dma->rx_dma_addr = 0xfffff000;
186 dma->tx_dma_addr = 0xfffff000;
187
188 param->dma_dev = &pdev->dev;
189 param->src_id = 0;
190 param->dst_id = 1;
191 param->hs_polarity = true;
192
193 lpss->dma_maxburst = 8;
194}
195
196static void qrk_serial_exit_dma(struct lpss8250 *lpss)
197{
198 struct dw_dma_slave *param = &lpss->dma_param;
199
200 if (!param->dma_dev)
201 return;
202 dw_dma_remove(&lpss->dma_chip);
203}
204#else
205static void qrk_serial_setup_dma(struct lpss8250 *lpss, struct uart_port *port) {}
206static void qrk_serial_exit_dma(struct lpss8250 *lpss) {}
207#endif
208
209static int qrk_serial_setup(struct lpss8250 *lpss, struct uart_port *port)
210{
211 struct pci_dev *pdev = to_pci_dev(port->dev);
212 int ret;
213
214 pci_set_master(pdev);
215
216 ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_ALL_TYPES);
217 if (ret < 0)
218 return ret;
219
220 port->irq = pci_irq_vector(pdev, 0);
221
222 qrk_serial_setup_dma(lpss, port);
223 return 0;
224}
225
226static void qrk_serial_exit(struct lpss8250 *lpss)
227{
228 qrk_serial_exit_dma(lpss);
229}
230
231static bool lpss8250_dma_filter(struct dma_chan *chan, void *param)
232{
233 struct dw_dma_slave *dws = param;
234
235 if (dws->dma_dev != chan->device->dev)
236 return false;
237
238 chan->private = dws;
239 return true;
240}
241
242static int lpss8250_dma_setup(struct lpss8250 *lpss, struct uart_8250_port *port)
243{
244 struct uart_8250_dma *dma = &lpss->dma;
245 struct dw_dma_slave *rx_param, *tx_param;
246 struct device *dev = port->port.dev;
247
248 if (!lpss->dma_param.dma_dev)
249 return 0;
250
251 rx_param = devm_kzalloc(dev, sizeof(*rx_param), GFP_KERNEL);
252 if (!rx_param)
253 return -ENOMEM;
254
255 tx_param = devm_kzalloc(dev, sizeof(*tx_param), GFP_KERNEL);
256 if (!tx_param)
257 return -ENOMEM;
258
259 *rx_param = lpss->dma_param;
260 dma->rxconf.src_maxburst = lpss->dma_maxburst;
261
262 *tx_param = lpss->dma_param;
263 dma->txconf.dst_maxburst = lpss->dma_maxburst;
264
265 dma->fn = lpss8250_dma_filter;
266 dma->rx_param = rx_param;
267 dma->tx_param = tx_param;
268
269 port->dma = dma;
270 return 0;
271}
272
273static int lpss8250_probe(struct pci_dev *pdev, const struct pci_device_id *id)
274{
275 struct uart_8250_port uart;
276 struct lpss8250 *lpss;
277 int ret;
278
279 ret = pcim_enable_device(pdev);
280 if (ret)
281 return ret;
282
283 lpss = devm_kzalloc(&pdev->dev, sizeof(*lpss), GFP_KERNEL);
284 if (!lpss)
285 return -ENOMEM;
286
287 lpss->board = (struct lpss8250_board *)id->driver_data;
288
289 memset(&uart, 0, sizeof(struct uart_8250_port));
290
291 uart.port.dev = &pdev->dev;
292 uart.port.irq = pdev->irq;
293 uart.port.private_data = lpss;
294 uart.port.type = PORT_16550A;
295 uart.port.iotype = UPIO_MEM;
296 uart.port.regshift = 2;
297 uart.port.uartclk = lpss->board->base_baud * 16;
298 uart.port.flags = UPF_SHARE_IRQ | UPF_FIXED_PORT | UPF_FIXED_TYPE;
299 uart.capabilities = UART_CAP_FIFO | UART_CAP_AFE;
300 uart.port.mapbase = pci_resource_start(pdev, 0);
301 uart.port.membase = pcim_iomap(pdev, 0, 0);
302 if (!uart.port.membase)
303 return -ENOMEM;
304
305 ret = lpss->board->setup(lpss, &uart.port);
306 if (ret)
307 return ret;
308
309 ret = lpss8250_dma_setup(lpss, &uart);
310 if (ret)
311 goto err_exit;
312
313 ret = serial8250_register_8250_port(&uart);
314 if (ret < 0)
315 goto err_exit;
316
317 lpss->line = ret;
318
319 pci_set_drvdata(pdev, lpss);
320 return 0;
321
322err_exit:
323 if (lpss->board->exit)
324 lpss->board->exit(lpss);
325 return ret;
326}
327
328static void lpss8250_remove(struct pci_dev *pdev)
329{
330 struct lpss8250 *lpss = pci_get_drvdata(pdev);
331
332 serial8250_unregister_port(lpss->line);
333
334 if (lpss->board->exit)
335 lpss->board->exit(lpss);
336}
337
338static const struct lpss8250_board byt_board = {
339 .freq = 100000000,
340 .base_baud = 2764800,
341 .setup = byt_serial_setup,
342};
343
344static const struct lpss8250_board qrk_board = {
345 .freq = 44236800,
346 .base_baud = 2764800,
347 .setup = qrk_serial_setup,
348 .exit = qrk_serial_exit,
349};
350
351#define LPSS_DEVICE(id, board) { PCI_VDEVICE(INTEL, id), (kernel_ulong_t)&board }
352
353static const struct pci_device_id pci_ids[] = {
354 LPSS_DEVICE(PCI_DEVICE_ID_INTEL_QRK_UARTx, qrk_board),
355 LPSS_DEVICE(PCI_DEVICE_ID_INTEL_BYT_UART1, byt_board),
356 LPSS_DEVICE(PCI_DEVICE_ID_INTEL_BYT_UART2, byt_board),
357 LPSS_DEVICE(PCI_DEVICE_ID_INTEL_BSW_UART1, byt_board),
358 LPSS_DEVICE(PCI_DEVICE_ID_INTEL_BSW_UART2, byt_board),
359 LPSS_DEVICE(PCI_DEVICE_ID_INTEL_BDW_UART1, byt_board),
360 LPSS_DEVICE(PCI_DEVICE_ID_INTEL_BDW_UART2, byt_board),
361 { },
362};
363MODULE_DEVICE_TABLE(pci, pci_ids);
364
365static struct pci_driver lpss8250_pci_driver = {
366 .name = "8250_lpss",
367 .id_table = pci_ids,
368 .probe = lpss8250_probe,
369 .remove = lpss8250_remove,
370};
371
372module_pci_driver(lpss8250_pci_driver);
373
374MODULE_AUTHOR("Intel Corporation");
375MODULE_LICENSE("GPL v2");
376MODULE_DESCRIPTION("Intel LPSS UART driver");
377
